x86/kprobes: Fix crash when probing CS CALL instructionsgrafted

When using eBPF to probe CS CALL instructions within a function,
a crash can be triggered.

The eBPF tool probes offset 257 of the __hrtimer_run_queues()
function:

<__hrtimer_run_queues+249>:  nopl   0x0(%rax,%rax,1)
<__hrtimer_run_queues+254>:  mov    %r14,%rdi
<__hrtimer_run_queues+257>:  cs call <__x86_indirect_thunk_r12>
<__hrtimer_run_queues+263>:  mov    %eax,%r12d
<__hrtimer_run_queues+266>:  xchg   %ax,%ax
<__hrtimer_run_queues+268>:  mov    %r13,%rdi

Which triggers this crash:

  BUG: unable to handle page fault for address: 00000000000f41c9
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P
  RIP: 0010:__hrtimer_run_queues+0x106/0x230

Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is
at the 6th byte of the above CS CALL instruction. Since the CS CALL
instruction occupies 6 bytes, the exception occurred in the middle of that
call instruction.

The root cause is that when using eBPF tools to probe in the middle of a
function, a kprobe with INT3 is used as the underlying implementation.

During single-step emulation of the original CALL instruction,
int3_emulate_call() assumes that the probed CALL instruction is 5 bytes
long. However, the actual CS-prefixed CALL instruction occupies 6 bytes,
so it constructs an incorrect exception return address. When the CPU
returns from the kprobe handler, the next instruction to be executed is at
the address of the last byte of that CS CALL instruction. Coincidentally,
starting from that address, the CPU fetches and decodes a completely
different instruction, which ultimately triggers a kernel crash.

Fix the issue by using the actual instruction length obtained from
the instruction decoder when constructing the exception return
address, rather than relying on the hardcoded CALL_INSN_SIZE macro.

[ mingo: Refined the changelog ]

Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000

19 files changed, 7277 insertions, 0 deletions

diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
new file mode 100644
index 000000000..1ea7c0391
--- /dev/null
+++ b/drivers/auxdisplay/Kconfig
@@ -0,0 +1,551 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/kconfig-language.rst.
+#
+# Auxiliary display drivers configuration.
+#
+
+menuconfig AUXDISPLAY
+	bool "Auxiliary Display support"
+	help
+	  Say Y here to get to see options for auxiliary display drivers.
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if AUXDISPLAY
+
+#
+# Character LCD section
+#
+config CHARLCD
+	tristate "Character LCD core support" if COMPILE_TEST
+	help
+	  This is the base system for character-based LCD displays.
+	  It makes no sense to have this alone, you select your display driver
+	  and if it needs the charlcd core, it will select it automatically.
+	  This is some character LCD core interface that multiple drivers can
+	  use.
+
+config HD44780_COMMON
+	tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
+	select CHARLCD
+	help
+	  This is a module with the common symbols for HD44780 (and compatibles)
+	  displays. This is the code that multiple other modules use. It is not
+	  useful alone. If you have some sort of HD44780 compatible display,
+	  you very likely use this. It is selected automatically by selecting
+	  your concrete display.
+
+config HD44780
+	tristate "HD44780 Character LCD support"
+	depends on GPIOLIB || COMPILE_TEST
+	select HD44780_COMMON
+	help
+	  Enable support for Character LCDs using a HD44780 controller.
+	  The LCD is accessible through the /dev/lcd char device (10, 156).
+	  This code can either be compiled as a module, or linked into the
+	  kernel and started at boot.
+	  If you don't understand what all this is about, say N.
+
+config LCD2S
+	tristate "lcd2s 20x4 character display over I2C console"
+	depends on I2C
+	select CHARLCD
+	help
+	  This is a driver that lets you use the lcd2s 20x4 character display
+	  from Modtronix engineering as a console output device. The display
+	  is a simple single color character display. You have to connect it
+	  to an I2C bus.
+
+menuconfig PARPORT_PANEL
+	tristate "Parallel port LCD/Keypad Panel support"
+	depends on PARPORT
+	select HD44780_COMMON
+	help
+	  Say Y here if you have an HD44780 or KS-0074 LCD connected to your
+	  parallel port. This driver also features 4 and 6-key keypads. The LCD
+	  is accessible through the /dev/lcd char device (10, 156), and the
+	  keypad through /dev/keypad (10, 185). This code can either be
+	  compiled as a module, or linked into the kernel and started at boot.
+	  If you don't understand what all this is about, say N.
+
+if PARPORT_PANEL
+
+config PANEL_PARPORT
+	int "Default parallel port number (0=LPT1)"
+	range 0 255
+	default "0"
+	help
+	  This is the index of the parallel port the panel is connected to. One
+	  driver instance only supports one parallel port, so if your keypad
+	  and LCD are connected to two separate ports, you have to start two
+	  modules with different arguments. Numbering starts with '0' for LPT1,
+	  and so on.
+
+config PANEL_PROFILE
+	int "Default panel profile (0-5, 0=custom)"
+	range 0 5
+	default "5"
+	help
+	  To ease configuration, the driver supports different configuration
+	  profiles for past and recent wirings. These profiles can also be
+	  used to define an approximative configuration, completed by a few
+	  other options. Here are the profiles :
+
+	    0 = custom (see further)
+	    1 = 2x16 parallel LCD, old keypad
+	    2 = 2x16 serial LCD (KS-0074), new keypad
+	    3 = 2x16 parallel LCD (Hantronix), no keypad
+	    4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
+	    5 = 2x40 parallel LCD (old one), with old keypad
+
+	  Custom configurations allow you to define how your display is
+	  wired to the parallel port, and how it works. This is only intended
+	  for experts.
+
+config PANEL_KEYPAD
+	depends on PANEL_PROFILE="0"
+	int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
+	range 0 3
+	default 0
+	help
+	  This enables and configures a keypad connected to the parallel port.
+	  The keys will be read from character device 10,185. Valid values are :
+
+	    0 : do not enable this driver
+	    1 : old 6 keys keypad
+	    2 : new 6 keys keypad, as used on the server at www.ant-computing.com
+	    3 : Nexcom NSA1045's 4 keys keypad
+
+	  New profiles can be described in the driver source. The driver also
+	  supports simultaneous keys pressed when the keypad supports them.
+
+config PANEL_LCD
+	depends on PANEL_PROFILE="0"
+	int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
+	range 0 5
+	default 0
+	help
+	   This enables and configures an LCD connected to the parallel port.
+	   The driver includes an interpreter for escape codes starting with
+	   '\e[L' which are specific to the LCD, and a few ANSI codes. The
+	   driver will be registered as character device 10,156, usually
+	   under the name '/dev/lcd'. There are a total of 6 supported types :
+
+	     0 : do not enable the driver
+	     1 : custom configuration and wiring (see further)
+	     2 : 2x16 & 2x40 parallel LCD (old wiring)
+	     3 : 2x16 serial LCD (KS-0074 based)
+	     4 : 2x16 parallel LCD (Hantronix wiring)
+	     5 : 2x16 parallel LCD (Nexcom wiring)
+
+	   When type '1' is specified, other options will appear to configure
+	   more precise aspects (wiring, dimensions, protocol, ...). Please note
+	   that those values changed from the 2.4 driver for better consistency.
+
+config PANEL_LCD_HEIGHT
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "Number of lines on the LCD (1-2)"
+	range 1 2
+	default 2
+	help
+	  This is the number of visible character lines on the LCD in custom profile.
+	  It can either be 1 or 2.
+
+config PANEL_LCD_WIDTH
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "Number of characters per line on the LCD (1-40)"
+	range 1 40
+	default 40
+	help
+	  This is the number of characters per line on the LCD in custom profile.
+	  Common values are 16,20,24,40.
+
+config PANEL_LCD_BWIDTH
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "Internal LCD line width (1-40, 40 by default)"
+	range 1 40
+	default 40
+	help
+	  Most LCDs use a standard controller which supports hardware lines of 40
+	  characters, although sometimes only 16, 20 or 24 of them are really wired
+	  to the terminal. This results in some non-visible but addressable characters,
+	  and is the case for most parallel LCDs. Other LCDs, and some serial ones,
+	  however, use the same line width internally as what is visible. The KS0074
+	  for example, uses 16 characters per line for 16 visible characters per line.
+
+	  This option lets you configure the value used by your LCD in 'custom' profile.
+	  If you don't know, put '40' here.
+
+config PANEL_LCD_HWIDTH
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "Hardware LCD line width (1-64, 64 by default)"
+	range 1 64
+	default 64
+	help
+	  Most LCDs use a single address bit to differentiate line 0 and line 1. Since
+	  some of them need to be able to address 40 chars with the lower bits, they
+	  often use the immediately superior power of 2, which is 64, to address the
+	  next line.
+
+	  If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
+	  64 here for a 2x40.
+
+config PANEL_LCD_CHARSET
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "LCD character set (0=normal, 1=KS0074)"
+	range 0 1
+	default 0
+	help
+	  Some controllers such as the KS0074 use a somewhat strange character set
+	  where many symbols are at unusual places. The driver knows how to map
+	  'standard' ASCII characters to the character sets used by these controllers.
+	  Valid values are :
+
+	     0 : normal (untranslated) character set
+	     1 : KS0074 character set
+
+	  If you don't know, use the normal one (0).
+
+config PANEL_LCD_PROTO
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "LCD communication mode (0=parallel 8 bits, 1=serial)"
+	range 0 1
+	default 0
+	help
+	  This driver now supports any serial or parallel LCD wired to a parallel
+	  port. But before assigning signals, the driver needs to know if it will
+	  be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
+	  (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
+	  (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
+	  parallel LCD, and 1 for a serial LCD.
+
+config PANEL_LCD_PIN_E
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
+	int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
+	range -17 17
+	default 14
+	help
+	  This describes the number of the parallel port pin to which the LCD 'E'
+	  signal has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'E' pin in custom profile is '14' (AUTOFEED).
+
+config PANEL_LCD_PIN_RS
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
+	int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
+	range -17 17
+	default 17
+	help
+	  This describes the number of the parallel port pin to which the LCD 'RS'
+	  signal has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'RS' pin in custom profile is '17' (SELECT IN).
+
+config PANEL_LCD_PIN_RW
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
+	int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
+	range -17 17
+	default 16
+	help
+	  This describes the number of the parallel port pin to which the LCD 'RW'
+	  signal has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'RW' pin in custom profile is '16' (INIT).
+
+config PANEL_LCD_PIN_SCL
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
+	int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
+	range -17 17
+	default 1
+	help
+	  This describes the number of the parallel port pin to which the serial
+	  LCD 'SCL' signal has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'SCL' pin in custom profile is '1' (STROBE).
+
+config PANEL_LCD_PIN_SDA
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
+	int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
+	range -17 17
+	default 2
+	help
+	  This describes the number of the parallel port pin to which the serial
+	  LCD 'SDA' signal has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'SDA' pin in custom profile is '2' (D0).
+
+config PANEL_LCD_PIN_BL
+	depends on PANEL_PROFILE="0" && PANEL_LCD="1"
+	int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
+	range -17 17
+	default 0
+	help
+	  This describes the number of the parallel port pin to which the LCD 'BL' signal
+	  has been connected. It can be :
+
+	          0 : no connection (eg: connected to ground)
+	      1..17 : directly connected to any of these pins on the DB25 plug
+	    -1..-17 : connected to the same pin through an inverter (eg: transistor).
+
+	  Default for the 'BL' pin in custom profile is '0' (uncontrolled).
+
+endif # PARPORT_PANEL
+
+config PANEL_CHANGE_MESSAGE
+	bool "Change LCD initialization message ?"
+	depends on CHARLCD || LINEDISP
+	help
+	  This allows you to replace the boot message indicating the kernel version
+	  and the driver version with a custom message. This is useful on appliances
+	  where a simple 'Starting system' message can be enough to stop a customer
+	  from worrying.
+
+	  If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
+	  say 'N' and keep the default message with the version.
+
+config PANEL_BOOT_MESSAGE
+	depends on PANEL_CHANGE_MESSAGE
+	string "New initialization message"
+	default ""
+	help
+	  This allows you to replace the boot message indicating the kernel version
+	  and the driver version with a custom message. This is useful on appliances
+	  where a simple 'Starting system' message can be enough to stop a customer
+	  from worrying.
+
+	  An empty message will only clear the display at driver init time. Any other
+	  printf()-formatted message is valid with newline and escape codes.
+
+choice
+	prompt "Backlight initial state"
+	default CHARLCD_BL_FLASH
+	help
+	  Select the initial backlight state on boot or module load.
+
+	  Previously, there was no option for this: the backlight flashed
+	  briefly on init. Now you can also turn it off/on.
+
+	config CHARLCD_BL_OFF
+		bool "Off"
+		help
+		  Backlight is initially turned off
+
+	config CHARLCD_BL_ON
+		bool "On"
+		help
+		  Backlight is initially turned on
+
+	config CHARLCD_BL_FLASH
+		bool "Flash"
+		help
+		  Backlight is flashed briefly on init
+
+endchoice
+
+#
+# Samsung KS0108 LCD controller section
+#
+config KS0108
+	tristate "KS0108 LCD Controller"
+	depends on PARPORT_PC
+	help
+	  If you have a LCD controlled by one or more KS0108
+	  controllers, say Y. You will need also another more specific
+	  driver for your LCD.
+
+	  Depends on Parallel Port support. If you say Y at
+	  parport, you will be able to compile this as a module (M)
+	  and built-in as well (Y).
+
+	  To compile this as a module, choose M here:
+	  the module will be called ks0108.
+
+	  If unsure, say N.
+
+config KS0108_PORT
+	hex "Parallel port where the LCD is connected"
+	depends on KS0108
+	default 0x378
+	help
+	  The address of the parallel port where the LCD is connected.
+
+	  The first  standard parallel port address is 0x378.
+	  The second standard parallel port address is 0x278.
+	  The third  standard parallel port address is 0x3BC.
+
+	  You can specify a different address if you need.
+
+	  If you don't know what I'm talking about, load the parport module,
+	  and execute "dmesg" or "cat /proc/ioports". You can see there how
+	  many parallel ports are present and which address each one has.
+
+	  Usually you only need to use 0x378.
+
+	  If you compile this as a module, you can still override this
+	  using the module parameters.
+
+config KS0108_DELAY
+	int "Delay between each control writing (microseconds)"
+	depends on KS0108
+	default "2"
+	help
+	  Amount of time the ks0108 should wait between each control write
+	  to the parallel port.
+
+	  If your LCD seems to miss random writings, increment this.
+
+	  If you don't know what I'm talking about, ignore it.
+
+	  If you compile this as a module, you can still override this
+	  value using the module parameters.
+
+config CFAG12864B
+	tristate "CFAG12864B LCD"
+	depends on X86
+	depends on FB
+	depends on KS0108
+	select FB_SYSMEM_HELPERS
+	help
+	  If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
+	  say Y. You also need the ks0108 LCD Controller driver.
+
+	  For help about how to wire your LCD to the parallel port,
+	  check Documentation/admin-guide/auxdisplay/cfag12864b.rst
+
+	  Depends on the x86 arch and the framebuffer support.
+
+	  The LCD framebuffer driver can be attached to a console.
+	  It will work fine. However, you can't attach it to the fbdev driver
+	  of the xorg server.
+
+	  To compile this as a module, choose M here:
+	  the modules will be called cfag12864b and cfag12864bfb.
+
+	  If unsure, say N.
+
+config CFAG12864B_RATE
+	int "Refresh rate (hertz)"
+	depends on CFAG12864B
+	default "20"
+	help
+	  Refresh rate of the LCD.
+
+	  As the LCD is not memory mapped, the driver has to make the work by
+	  software. This means you should be careful setting this value higher.
+	  If your CPUs are really slow or you feel the system is slowed down,
+	  decrease the value.
+
+	  Be careful modifying this value to a very high value:
+	  You can freeze the computer, or the LCD maybe can't draw as fast as you
+	  are requesting.
+
+	  If you don't know what I'm talking about, ignore it.
+
+	  If you compile this as a module, you can still override this
+	  value using the module parameters.
+
+#
+# Single character line display section
+#
+config LINEDISP
+	tristate "Character line display core support" if COMPILE_TEST
+	help
+	  This is the core support for single-line character displays, to be
+	  selected by drivers that use it.
+
+config IMG_ASCII_LCD
+	tristate "Imagination Technologies ASCII LCD Display"
+	depends on HAS_IOMEM
+	default y if MIPS_MALTA
+	select MFD_SYSCON
+	select LINEDISP
+	help
+	  Enable this to support the simple ASCII LCD displays found on
+	  development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
+	  from Imagination Technologies.
+
+config HT16K33
+	tristate "Holtek Ht16K33 LED controller with keyscan"
+	depends on FB && I2C && INPUT && BACKLIGHT_CLASS_DEVICE
+	select FB_SYSMEM_HELPERS
+	select INPUT_MATRIXKMAP
+	select FB_BACKLIGHT
+	select NEW_LEDS
+	select LEDS_CLASS
+	select LINEDISP
+	help
+	  Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
+	  LED controller driver with keyscan.
+
+config MAX6959
+	tristate "Maxim MAX6958/6959 7-segment LED controller"
+	depends on I2C
+	select BITREVERSE
+	select REGMAP_I2C
+	select LINEDISP
+	help
+	  If you say yes here you get support for the following Maxim chips
+	  (I2C 7-segment LED display controller):
+	  - MAX6958
+	  - MAX6959 (input support)
+
+	  This driver can also be built as a module. If so, the module
+	  will be called max6959.
+
+config SEG_LED_GPIO
+	tristate "Generic 7-segment LED display"
+	depends on GPIOLIB || COMPILE_TEST
+	select LINEDISP
+	help
+	  This driver supports a generic 7-segment LED display made up
+	  of GPIO pins connected to the individual segments.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called seg-led-gpio.
+
+#
+# Character LCD with non-conforming interface section
+#
+config ARM_CHARLCD
+	bool "ARM Ltd. Character LCD Driver"
+	depends on PLAT_VERSATILE
+	help
+	  This is a driver for the character LCD found on the ARM Ltd.
+	  Versatile and RealView Platform Baseboards. It doesn't do
+	  very much more than display the text "ARM Linux" on the first
+	  line and the Linux version on the second line, but that's
+	  still useful.
+
+endif # AUXDISPLAY
+
+#
+# Deprecated options
+#
+config PANEL
+	tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
+	depends on PARPORT
+	select AUXDISPLAY
+	select PARPORT_PANEL
diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile
new file mode 100644
index 000000000..f5c13ed1c
--- /dev/null
+++ b/drivers/auxdisplay/Makefile
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the kernel auxiliary displays device drivers.
+#
+
+obj-$(CONFIG_ARM_CHARLCD)	+= arm-charlcd.o
+obj-$(CONFIG_CFAG12864B)	+= cfag12864b.o cfag12864bfb.o
+obj-$(CONFIG_CHARLCD)		+= charlcd.o
+obj-$(CONFIG_HD44780_COMMON)	+= hd44780_common.o
+obj-$(CONFIG_HD44780)		+= hd44780.o
+obj-$(CONFIG_HT16K33)		+= ht16k33.o
+obj-$(CONFIG_IMG_ASCII_LCD)	+= img-ascii-lcd.o
+obj-$(CONFIG_KS0108)		+= ks0108.o
+obj-$(CONFIG_LCD2S)		+= lcd2s.o
+obj-$(CONFIG_LINEDISP)		+= line-display.o
+obj-$(CONFIG_MAX6959)		+= max6959.o
+obj-$(CONFIG_PARPORT_PANEL)	+= panel.o
+obj-$(CONFIG_SEG_LED_GPIO)	+= seg-led-gpio.o
diff --git a/drivers/auxdisplay/arm-charlcd.c b/drivers/auxdisplay/arm-charlcd.c
new file mode 100644
index 000000000..70efda4f7
--- /dev/null
+++ b/drivers/auxdisplay/arm-charlcd.c
@@ -0,0 +1,327 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the on-board character LCD found on some ARM reference boards
+ * This is basically an Hitachi HD44780 LCD with a custom IP block to drive it
+ * https://en.wikipedia.org/wiki/HD44780_Character_LCD
+ * Currently it will just display the text "ARM Linux" and the linux version
+ *
+ * Author: Linus Walleij <triad@df.lth.se>
+ */
+#include <linux/completion.h>
+#include <linux/container_of.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <generated/utsrelease.h>
+
+#define DRIVERNAME "arm-charlcd"
+#define CHARLCD_TIMEOUT (msecs_to_jiffies(1000))
+
+/* Offsets to registers */
+#define CHAR_COM	0x00U
+#define CHAR_DAT	0x04U
+#define CHAR_RD		0x08U
+#define CHAR_RAW	0x0CU
+#define CHAR_MASK	0x10U
+#define CHAR_STAT	0x14U
+
+#define CHAR_RAW_CLEAR	0x00000000U
+#define CHAR_RAW_VALID	0x00000100U
+
+/* Hitachi HD44780 display commands */
+#define HD_CLEAR			0x01U
+#define HD_HOME				0x02U
+#define HD_ENTRYMODE			0x04U
+#define HD_ENTRYMODE_INCREMENT		0x02U
+#define HD_ENTRYMODE_SHIFT		0x01U
+#define HD_DISPCTRL			0x08U
+#define HD_DISPCTRL_ON			0x04U
+#define HD_DISPCTRL_CURSOR_ON		0x02U
+#define HD_DISPCTRL_CURSOR_BLINK	0x01U
+#define HD_CRSR_SHIFT			0x10U
+#define HD_CRSR_SHIFT_DISPLAY		0x08U
+#define HD_CRSR_SHIFT_DISPLAY_RIGHT	0x04U
+#define HD_FUNCSET			0x20U
+#define HD_FUNCSET_8BIT			0x10U
+#define HD_FUNCSET_2_LINES		0x08U
+#define HD_FUNCSET_FONT_5X10		0x04U
+#define HD_SET_CGRAM			0x40U
+#define HD_SET_DDRAM			0x80U
+#define HD_BUSY_FLAG			0x80U
+
+/**
+ * struct charlcd - Private data structure
+ * @dev: a pointer back to containing device
+ * @virtbase: the offset to the controller in virtual memory
+ * @irq: reserved interrupt number
+ * @complete: completion structure for the last LCD command
+ * @init_work: delayed work structure to initialize the display on boot
+ */
+struct charlcd {
+	struct device *dev;
+	void __iomem *virtbase;
+	int irq;
+	struct completion complete;
+	struct delayed_work init_work;
+};
+
+static irqreturn_t charlcd_interrupt(int irq, void *data)
+{
+	struct charlcd *lcd = data;
+	u8 status;
+
+	status = readl(lcd->virtbase + CHAR_STAT) & 0x01;
+	/* Clear IRQ */
+	writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	if (status)
+		complete(&lcd->complete);
+	else
+		dev_info(lcd->dev, "Spurious IRQ (%02x)\n", status);
+	return IRQ_HANDLED;
+}
+
+
+static void charlcd_wait_complete_irq(struct charlcd *lcd)
+{
+	int ret;
+
+	ret = wait_for_completion_interruptible_timeout(&lcd->complete,
+							CHARLCD_TIMEOUT);
+	/* Disable IRQ after completion */
+	writel(0x00, lcd->virtbase + CHAR_MASK);
+
+	if (ret < 0) {
+		dev_err(lcd->dev,
+			"wait_for_completion_interruptible_timeout() returned %d waiting for ready\n",
+			ret);
+		return;
+	}
+
+	if (ret == 0) {
+		dev_err(lcd->dev, "charlcd controller timed out waiting for ready\n");
+		return;
+	}
+}
+
+static u8 charlcd_4bit_read_char(struct charlcd *lcd)
+{
+	u8 data;
+	u32 val;
+
+	/* If we can, use an IRQ to wait for the data, else poll */
+	if (lcd->irq >= 0)
+		charlcd_wait_complete_irq(lcd);
+	else {
+		udelay(100);
+		readl_poll_timeout_atomic(lcd->virtbase + CHAR_RAW, val,
+					  val & CHAR_RAW_VALID, 100, 1000);
+		writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	}
+	msleep(1);
+
+	/* Read the 4 high bits of the data */
+	data = readl(lcd->virtbase + CHAR_RD) & 0xf0;
+
+	/*
+	 * The second read for the low bits does not trigger an IRQ
+	 * so in this case we have to poll for the 4 lower bits
+	 */
+	udelay(100);
+	readl_poll_timeout_atomic(lcd->virtbase + CHAR_RAW, val,
+				  val & CHAR_RAW_VALID, 100, 1000);
+	writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	msleep(1);
+
+	/* Read the 4 low bits of the data */
+	data |= (readl(lcd->virtbase + CHAR_RD) >> 4) & 0x0f;
+
+	return data;
+}
+
+static bool charlcd_4bit_read_bf(struct charlcd *lcd)
+{
+	if (lcd->irq >= 0) {
+		/*
+		 * If we'll use IRQs to wait for the busyflag, clear any
+		 * pending flag and enable IRQ
+		 */
+		writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+		init_completion(&lcd->complete);
+		writel(0x01, lcd->virtbase + CHAR_MASK);
+	}
+	readl(lcd->virtbase + CHAR_COM);
+
+	return charlcd_4bit_read_char(lcd) & HD_BUSY_FLAG;
+}
+
+static void charlcd_4bit_wait_busy(struct charlcd *lcd)
+{
+	int retries = 50;
+
+	udelay(100);
+	while (charlcd_4bit_read_bf(lcd) && retries)
+		retries--;
+	if (!retries)
+		dev_err(lcd->dev, "timeout waiting for busyflag\n");
+}
+
+static void charlcd_4bit_command(struct charlcd *lcd, u8 cmd)
+{
+	u32 cmdlo = (cmd << 4) & 0xf0;
+	u32 cmdhi = (cmd & 0xf0);
+
+	writel(cmdhi, lcd->virtbase + CHAR_COM);
+	udelay(10);
+	writel(cmdlo, lcd->virtbase + CHAR_COM);
+	charlcd_4bit_wait_busy(lcd);
+}
+
+static void charlcd_4bit_char(struct charlcd *lcd, u8 ch)
+{
+	u32 chlo = (ch << 4) & 0xf0;
+	u32 chhi = (ch & 0xf0);
+
+	writel(chhi, lcd->virtbase + CHAR_DAT);
+	udelay(10);
+	writel(chlo, lcd->virtbase + CHAR_DAT);
+	charlcd_4bit_wait_busy(lcd);
+}
+
+static void charlcd_4bit_print(struct charlcd *lcd, int line, const char *str)
+{
+	u8 offset;
+	int i;
+
+	/*
+	 * We support line 0, 1
+	 * Line 1 runs from 0x00..0x27
+	 * Line 2 runs from 0x28..0x4f
+	 */
+	if (line == 0)
+		offset = 0;
+	else if (line == 1)
+		offset = 0x28;
+	else
+		return;
+
+	/* Set offset */
+	charlcd_4bit_command(lcd, HD_SET_DDRAM | offset);
+
+	/* Send string */
+	for (i = 0; i < strlen(str) && i < 0x28; i++)
+		charlcd_4bit_char(lcd, str[i]);
+}
+
+static void charlcd_4bit_init(struct charlcd *lcd)
+{
+	/* These commands cannot be checked with the busy flag */
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	msleep(5);
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	/* Go to 4bit mode */
+	writel(HD_FUNCSET, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	/*
+	 * 4bit mode, 2 lines, 5x8 font, after this the number of lines
+	 * and the font cannot be changed until the next initialization sequence
+	 */
+	charlcd_4bit_command(lcd, HD_FUNCSET | HD_FUNCSET_2_LINES);
+	charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON);
+	charlcd_4bit_command(lcd, HD_ENTRYMODE | HD_ENTRYMODE_INCREMENT);
+	charlcd_4bit_command(lcd, HD_CLEAR);
+	charlcd_4bit_command(lcd, HD_HOME);
+	/* Put something useful in the display */
+	charlcd_4bit_print(lcd, 0, "ARM Linux");
+	charlcd_4bit_print(lcd, 1, UTS_RELEASE);
+}
+
+static void charlcd_init_work(struct work_struct *work)
+{
+	struct charlcd *lcd =
+		container_of(work, struct charlcd, init_work.work);
+
+	charlcd_4bit_init(lcd);
+}
+
+static int __init charlcd_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+	struct charlcd *lcd;
+
+	lcd = devm_kzalloc(dev, sizeof(*lcd), GFP_KERNEL);
+	if (!lcd)
+		return -ENOMEM;
+
+	lcd->dev = &pdev->dev;
+
+	lcd->virtbase = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(lcd->virtbase))
+		return PTR_ERR(lcd->virtbase);
+
+	lcd->irq = platform_get_irq(pdev, 0);
+	/* If no IRQ is supplied, we'll survive without it */
+	if (lcd->irq >= 0) {
+		ret = devm_request_irq(dev, lcd->irq, charlcd_interrupt, 0, DRIVERNAME, lcd);
+		if (ret)
+			return ret;
+	}
+
+	platform_set_drvdata(pdev, lcd);
+
+	/*
+	 * Initialize the display in a delayed work, because
+	 * it is VERY slow and would slow down the boot of the system.
+	 */
+	INIT_DELAYED_WORK(&lcd->init_work, charlcd_init_work);
+	schedule_delayed_work(&lcd->init_work, 0);
+
+	return 0;
+}
+
+static int charlcd_suspend(struct device *dev)
+{
+	struct charlcd *lcd = dev_get_drvdata(dev);
+
+	/* Power the display off */
+	charlcd_4bit_command(lcd, HD_DISPCTRL);
+	return 0;
+}
+
+static int charlcd_resume(struct device *dev)
+{
+	struct charlcd *lcd = dev_get_drvdata(dev);
+
+	/* Turn the display back on */
+	charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON);
+	return 0;
+}
+
+static const struct dev_pm_ops charlcd_pm_ops = {
+	.suspend = charlcd_suspend,
+	.resume = charlcd_resume,
+};
+
+static const struct of_device_id charlcd_match[] = {
+	{ .compatible = "arm,versatile-lcd", },
+	{}
+};
+
+static struct platform_driver charlcd_driver = {
+	.driver = {
+		.name = DRIVERNAME,
+		.pm = &charlcd_pm_ops,
+		.suppress_bind_attrs = true,
+		.of_match_table = charlcd_match,
+	},
+};
+builtin_platform_driver_probe(charlcd_driver, charlcd_probe);
diff --git a/drivers/auxdisplay/cfag12864b.c b/drivers/auxdisplay/cfag12864b.c
new file mode 100644
index 000000000..e1a94ae3e
--- /dev/null
+++ b/drivers/auxdisplay/cfag12864b.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *    Filename: cfag12864b.c
+ *     Version: 0.1.0
+ * Description: cfag12864b LCD driver
+ *     Depends: ks0108
+ *
+ *      Author: Copyright (C) Miguel Ojeda <ojeda@kernel.org>
+ *        Date: 2006-10-31
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/jiffies.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <linux/workqueue.h>
+#include <linux/ks0108.h>
+#include <linux/cfag12864b.h>
+
+
+#define CFAG12864B_NAME "cfag12864b"
+
+/*
+ * Module Parameters
+ */
+
+static unsigned int cfag12864b_rate = CONFIG_CFAG12864B_RATE;
+module_param(cfag12864b_rate, uint, 0444);
+MODULE_PARM_DESC(cfag12864b_rate,
+	"Refresh rate (hertz)");
+
+/*
+ * cfag12864b Commands
+ *
+ *	E = Enable signal
+ *		Every time E switch from low to high,
+ *		cfag12864b/ks0108 reads the command/data.
+ *
+ *	CS1 = First ks0108controller.
+ *		If high, the first ks0108 controller receives commands/data.
+ *
+ *	CS2 = Second ks0108 controller
+ *		If high, the second ks0108 controller receives commands/data.
+ *
+ *	DI = Data/Instruction
+ *		If low, cfag12864b will expect commands.
+ *		If high, cfag12864b will expect data.
+ *
+ */
+
+#define bit(n) (((unsigned char)1)<<(n))
+
+#define CFAG12864B_BIT_E	(0)
+#define CFAG12864B_BIT_CS1	(2)
+#define CFAG12864B_BIT_CS2	(1)
+#define CFAG12864B_BIT_DI	(3)
+
+static unsigned char cfag12864b_state;
+
+static void cfag12864b_set(void)
+{
+	ks0108_writecontrol(cfag12864b_state);
+}
+
+static void cfag12864b_setbit(unsigned char state, unsigned char n)
+{
+	if (state)
+		cfag12864b_state |= bit(n);
+	else
+		cfag12864b_state &= ~bit(n);
+}
+
+static void cfag12864b_e(unsigned char state)
+{
+	cfag12864b_setbit(state, CFAG12864B_BIT_E);
+	cfag12864b_set();
+}
+
+static void cfag12864b_cs1(unsigned char state)
+{
+	cfag12864b_setbit(state, CFAG12864B_BIT_CS1);
+}
+
+static void cfag12864b_cs2(unsigned char state)
+{
+	cfag12864b_setbit(state, CFAG12864B_BIT_CS2);
+}
+
+static void cfag12864b_di(unsigned char state)
+{
+	cfag12864b_setbit(state, CFAG12864B_BIT_DI);
+}
+
+static void cfag12864b_setcontrollers(unsigned char first,
+	unsigned char second)
+{
+	if (first)
+		cfag12864b_cs1(0);
+	else
+		cfag12864b_cs1(1);
+
+	if (second)
+		cfag12864b_cs2(0);
+	else
+		cfag12864b_cs2(1);
+}
+
+static void cfag12864b_controller(unsigned char which)
+{
+	if (which == 0)
+		cfag12864b_setcontrollers(1, 0);
+	else if (which == 1)
+		cfag12864b_setcontrollers(0, 1);
+}
+
+static void cfag12864b_displaystate(unsigned char state)
+{
+	cfag12864b_di(0);
+	cfag12864b_e(1);
+	ks0108_displaystate(state);
+	cfag12864b_e(0);
+}
+
+static void cfag12864b_address(unsigned char address)
+{
+	cfag12864b_di(0);
+	cfag12864b_e(1);
+	ks0108_address(address);
+	cfag12864b_e(0);
+}
+
+static void cfag12864b_page(unsigned char page)
+{
+	cfag12864b_di(0);
+	cfag12864b_e(1);
+	ks0108_page(page);
+	cfag12864b_e(0);
+}
+
+static void cfag12864b_startline(unsigned char startline)
+{
+	cfag12864b_di(0);
+	cfag12864b_e(1);
+	ks0108_startline(startline);
+	cfag12864b_e(0);
+}
+
+static void cfag12864b_writebyte(unsigned char byte)
+{
+	cfag12864b_di(1);
+	cfag12864b_e(1);
+	ks0108_writedata(byte);
+	cfag12864b_e(0);
+}
+
+static void cfag12864b_nop(void)
+{
+	cfag12864b_startline(0);
+}
+
+/*
+ * cfag12864b Internal Commands
+ */
+
+static void cfag12864b_on(void)
+{
+	cfag12864b_setcontrollers(1, 1);
+	cfag12864b_displaystate(1);
+}
+
+static void cfag12864b_off(void)
+{
+	cfag12864b_setcontrollers(1, 1);
+	cfag12864b_displaystate(0);
+}
+
+static void cfag12864b_clear(void)
+{
+	unsigned char i, j;
+
+	cfag12864b_setcontrollers(1, 1);
+	for (i = 0; i < CFAG12864B_PAGES; i++) {
+		cfag12864b_page(i);
+		cfag12864b_address(0);
+		for (j = 0; j < CFAG12864B_ADDRESSES; j++)
+			cfag12864b_writebyte(0);
+	}
+}
+
+/*
+ * Update work
+ */
+
+unsigned char *cfag12864b_buffer;
+static unsigned char *cfag12864b_cache;
+static DEFINE_MUTEX(cfag12864b_mutex);
+static unsigned char cfag12864b_updating;
+static void cfag12864b_update(struct work_struct *delayed_work);
+static struct workqueue_struct *cfag12864b_workqueue;
+static DECLARE_DELAYED_WORK(cfag12864b_work, cfag12864b_update);
+
+static void cfag12864b_queue(void)
+{
+	queue_delayed_work(cfag12864b_workqueue, &cfag12864b_work,
+		HZ / cfag12864b_rate);
+}
+
+unsigned char cfag12864b_enable(void)
+{
+	unsigned char ret;
+
+	mutex_lock(&cfag12864b_mutex);
+
+	if (!cfag12864b_updating) {
+		cfag12864b_updating = 1;
+		cfag12864b_queue();
+		ret = 0;
+	} else
+		ret = 1;
+
+	mutex_unlock(&cfag12864b_mutex);
+
+	return ret;
+}
+
+void cfag12864b_disable(void)
+{
+	mutex_lock(&cfag12864b_mutex);
+
+	if (cfag12864b_updating) {
+		cfag12864b_updating = 0;
+		cancel_delayed_work(&cfag12864b_work);
+		flush_workqueue(cfag12864b_workqueue);
+	}
+
+	mutex_unlock(&cfag12864b_mutex);
+}
+
+static void cfag12864b_update(struct work_struct *work)
+{
+	unsigned char c;
+	unsigned short i, j, k, b;
+
+	if (memcmp(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE)) {
+		for (i = 0; i < CFAG12864B_CONTROLLERS; i++) {
+			cfag12864b_controller(i);
+			cfag12864b_nop();
+			for (j = 0; j < CFAG12864B_PAGES; j++) {
+				cfag12864b_page(j);
+				cfag12864b_nop();
+				cfag12864b_address(0);
+				cfag12864b_nop();
+				for (k = 0; k < CFAG12864B_ADDRESSES; k++) {
+					for (c = 0, b = 0; b < 8; b++)
+						if (cfag12864b_buffer
+							[i * CFAG12864B_ADDRESSES / 8
+							+ k / 8 + (j * 8 + b) *
+							CFAG12864B_WIDTH / 8]
+							& bit(k % 8))
+							c |= bit(b);
+					cfag12864b_writebyte(c);
+				}
+			}
+		}
+
+		memcpy(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE);
+	}
+
+	if (cfag12864b_updating)
+		cfag12864b_queue();
+}
+
+/*
+ * cfag12864b Exported Symbols
+ */
+
+EXPORT_SYMBOL_GPL(cfag12864b_buffer);
+EXPORT_SYMBOL_GPL(cfag12864b_enable);
+EXPORT_SYMBOL_GPL(cfag12864b_disable);
+
+/*
+ * Is the module inited?
+ */
+
+static unsigned char cfag12864b_inited;
+unsigned char cfag12864b_isinited(void)
+{
+	return cfag12864b_inited;
+}
+EXPORT_SYMBOL_GPL(cfag12864b_isinited);
+
+/*
+ * Module Init & Exit
+ */
+
+static int __init cfag12864b_init(void)
+{
+	int ret = -EINVAL;
+
+	/* ks0108_init() must be called first */
+	if (!ks0108_isinited()) {
+		printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+			"ks0108 is not initialized\n");
+		goto none;
+	}
+	BUILD_BUG_ON(PAGE_SIZE < CFAG12864B_SIZE);
+
+	cfag12864b_buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
+	if (cfag12864b_buffer == NULL) {
+		printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+			"can't get a free page\n");
+		ret = -ENOMEM;
+		goto none;
+	}
+
+	cfag12864b_cache = kmalloc(CFAG12864B_SIZE,
+				   GFP_KERNEL);
+	if (cfag12864b_cache == NULL) {
+		printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+			"can't alloc cache buffer (%i bytes)\n",
+			CFAG12864B_SIZE);
+		ret = -ENOMEM;
+		goto bufferalloced;
+	}
+
+	cfag12864b_workqueue = create_singlethread_workqueue(CFAG12864B_NAME);
+	if (cfag12864b_workqueue == NULL)
+		goto cachealloced;
+
+	cfag12864b_clear();
+	cfag12864b_on();
+
+	cfag12864b_inited = 1;
+	return 0;
+
+cachealloced:
+	kfree(cfag12864b_cache);
+
+bufferalloced:
+	free_page((unsigned long) cfag12864b_buffer);
+
+none:
+	return ret;
+}
+
+static void __exit cfag12864b_exit(void)
+{
+	cfag12864b_disable();
+	cfag12864b_off();
+	destroy_workqueue(cfag12864b_workqueue);
+	kfree(cfag12864b_cache);
+	free_page((unsigned long) cfag12864b_buffer);
+}
+
+module_init(cfag12864b_init);
+module_exit(cfag12864b_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
+MODULE_DESCRIPTION("cfag12864b LCD driver");
diff --git a/drivers/auxdisplay/cfag12864bfb.c b/drivers/auxdisplay/cfag12864bfb.c
new file mode 100644
index 000000000..24baf6b2c
--- /dev/null
+++ b/drivers/auxdisplay/cfag12864bfb.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *    Filename: cfag12864bfb.c
+ *     Version: 0.1.0
+ * Description: cfag12864b LCD framebuffer driver
+ *     Depends: cfag12864b
+ *
+ *      Author: Copyright (C) Miguel Ojeda <ojeda@kernel.org>
+ *        Date: 2006-10-31
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/cfag12864b.h>
+
+#define CFAG12864BFB_NAME "cfag12864bfb"
+
+static const struct fb_fix_screeninfo cfag12864bfb_fix = {
+	.id = "cfag12864b",
+	.type = FB_TYPE_PACKED_PIXELS,
+	.visual = FB_VISUAL_MONO10,
+	.xpanstep = 0,
+	.ypanstep = 0,
+	.ywrapstep = 0,
+	.line_length = CFAG12864B_WIDTH / 8,
+	.accel = FB_ACCEL_NONE,
+};
+
+static const struct fb_var_screeninfo cfag12864bfb_var = {
+	.xres = CFAG12864B_WIDTH,
+	.yres = CFAG12864B_HEIGHT,
+	.xres_virtual = CFAG12864B_WIDTH,
+	.yres_virtual = CFAG12864B_HEIGHT,
+	.bits_per_pixel = 1,
+	.red = { 0, 1, 0 },
+	.green = { 0, 1, 0 },
+	.blue = { 0, 1, 0 },
+	.left_margin = 0,
+	.right_margin = 0,
+	.upper_margin = 0,
+	.lower_margin = 0,
+	.vmode = FB_VMODE_NONINTERLACED,
+};
+
+static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct page *pages = virt_to_page(cfag12864b_buffer);
+
+	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
+
+	return vm_map_pages_zero(vma, &pages, 1);
+}
+
+static const struct fb_ops cfag12864bfb_ops = {
+	.owner = THIS_MODULE,
+	__FB_DEFAULT_SYSMEM_OPS_RDWR,
+	__FB_DEFAULT_SYSMEM_OPS_DRAW,
+	.fb_mmap = cfag12864bfb_mmap,
+};
+
+static int cfag12864bfb_probe(struct platform_device *device)
+{
+	int ret = -EINVAL;
+	struct fb_info *info = framebuffer_alloc(0, &device->dev);
+
+	if (!info)
+		goto none;
+
+	info->flags = FBINFO_VIRTFB;
+	info->screen_buffer = cfag12864b_buffer;
+	info->screen_size = CFAG12864B_SIZE;
+	info->fbops = &cfag12864bfb_ops;
+	info->fix = cfag12864bfb_fix;
+	info->var = cfag12864bfb_var;
+	info->pseudo_palette = NULL;
+	info->par = NULL;
+
+	if (register_framebuffer(info) < 0)
+		goto fballoced;
+
+	platform_set_drvdata(device, info);
+
+	fb_info(info, "%s frame buffer device\n", info->fix.id);
+
+	return 0;
+
+fballoced:
+	framebuffer_release(info);
+
+none:
+	return ret;
+}
+
+static void cfag12864bfb_remove(struct platform_device *device)
+{
+	struct fb_info *info = platform_get_drvdata(device);
+
+	if (info) {
+		unregister_framebuffer(info);
+		framebuffer_release(info);
+	}
+}
+
+static struct platform_driver cfag12864bfb_driver = {
+	.probe	= cfag12864bfb_probe,
+	.remove = cfag12864bfb_remove,
+	.driver = {
+		.name	= CFAG12864BFB_NAME,
+	},
+};
+
+static struct platform_device *cfag12864bfb_device;
+
+static int __init cfag12864bfb_init(void)
+{
+	int ret = -EINVAL;
+
+	/* cfag12864b_init() must be called first */
+	if (!cfag12864b_isinited()) {
+		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
+			"cfag12864b is not initialized\n");
+		goto none;
+	}
+
+	if (cfag12864b_enable()) {
+		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
+			"can't enable cfag12864b refreshing (being used)\n");
+		return -ENODEV;
+	}
+
+	ret = platform_driver_register(&cfag12864bfb_driver);
+
+	if (!ret) {
+		cfag12864bfb_device =
+			platform_device_alloc(CFAG12864BFB_NAME, 0);
+
+		if (cfag12864bfb_device)
+			ret = platform_device_add(cfag12864bfb_device);
+		else
+			ret = -ENOMEM;
+
+		if (ret) {
+			platform_device_put(cfag12864bfb_device);
+			platform_driver_unregister(&cfag12864bfb_driver);
+		}
+	}
+
+none:
+	return ret;
+}
+
+static void __exit cfag12864bfb_exit(void)
+{
+	platform_device_unregister(cfag12864bfb_device);
+	platform_driver_unregister(&cfag12864bfb_driver);
+	cfag12864b_disable();
+}
+
+module_init(cfag12864bfb_init);
+module_exit(cfag12864bfb_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
+MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
new file mode 100644
index 000000000..ae2692ec3
--- /dev/null
+++ b/drivers/auxdisplay/charlcd.c
@@ -0,0 +1,691 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Character LCD driver for Linux
+ *
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ */
+
+#include <linux/atomic.h>
+#include <linux/ctype.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/workqueue.h>
+
+#ifndef CONFIG_PANEL_BOOT_MESSAGE
+#include <generated/utsrelease.h>
+#endif
+
+#include "charlcd.h"
+
+/* Keep the backlight on this many seconds for each flash */
+#define LCD_BL_TEMPO_PERIOD	4
+
+#define LCD_ESCAPE_LEN		24	/* Max chars for LCD escape command */
+#define LCD_ESCAPE_CHAR		27	/* Use char 27 for escape command */
+
+struct charlcd_priv {
+	struct charlcd lcd;
+
+	struct delayed_work bl_work;
+	struct mutex bl_tempo_lock;	/* Protects access to bl_tempo */
+	bool bl_tempo;
+
+	bool must_clear;
+
+	/* contains the LCD config state */
+	unsigned long flags;
+
+	/* Current escape sequence and it's length or -1 if outside */
+	struct {
+		char buf[LCD_ESCAPE_LEN + 1];
+		int len;
+	} esc_seq;
+
+	unsigned long long drvdata[];
+};
+
+#define charlcd_to_priv(p)	container_of(p, struct charlcd_priv, lcd)
+
+/* Device single-open policy control */
+static atomic_t charlcd_available = ATOMIC_INIT(1);
+
+/* turn the backlight on or off */
+void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+
+	if (!lcd->ops->backlight)
+		return;
+
+	mutex_lock(&priv->bl_tempo_lock);
+	if (!priv->bl_tempo)
+		lcd->ops->backlight(lcd, on);
+	mutex_unlock(&priv->bl_tempo_lock);
+}
+EXPORT_SYMBOL_GPL(charlcd_backlight);
+
+static void charlcd_bl_off(struct work_struct *work)
+{
+	struct delayed_work *dwork = to_delayed_work(work);
+	struct charlcd_priv *priv =
+		container_of(dwork, struct charlcd_priv, bl_work);
+
+	mutex_lock(&priv->bl_tempo_lock);
+	if (priv->bl_tempo) {
+		priv->bl_tempo = false;
+		if (!(priv->flags & LCD_FLAG_L))
+			priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);
+	}
+	mutex_unlock(&priv->bl_tempo_lock);
+}
+
+/* turn the backlight on for a little while */
+void charlcd_poke(struct charlcd *lcd)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+
+	if (!lcd->ops->backlight)
+		return;
+
+	cancel_delayed_work_sync(&priv->bl_work);
+
+	mutex_lock(&priv->bl_tempo_lock);
+	if (!priv->bl_tempo && !(priv->flags & LCD_FLAG_L))
+		lcd->ops->backlight(lcd, CHARLCD_ON);
+	priv->bl_tempo = true;
+	schedule_delayed_work(&priv->bl_work, LCD_BL_TEMPO_PERIOD * HZ);
+	mutex_unlock(&priv->bl_tempo_lock);
+}
+EXPORT_SYMBOL_GPL(charlcd_poke);
+
+static void charlcd_home(struct charlcd *lcd)
+{
+	lcd->addr.x = 0;
+	lcd->addr.y = 0;
+	lcd->ops->home(lcd);
+}
+
+static void charlcd_print(struct charlcd *lcd, char c)
+{
+	if (lcd->addr.x >= lcd->width)
+		return;
+
+	if (lcd->char_conv)
+		c = lcd->char_conv[(unsigned char)c];
+
+	if (!lcd->ops->print(lcd, c))
+		lcd->addr.x++;
+
+	/* prevents the cursor from wrapping onto the next line */
+	if (lcd->addr.x == lcd->width)
+		lcd->ops->gotoxy(lcd, lcd->addr.x - 1, lcd->addr.y);
+}
+
+static void charlcd_clear_display(struct charlcd *lcd)
+{
+	lcd->ops->clear_display(lcd);
+	lcd->addr.x = 0;
+	lcd->addr.y = 0;
+}
+
+/*
+ * Parses a movement command of the form "(.*);", where the group can be
+ * any number of subcommands of the form "(x|y)[0-9]+".
+ *
+ * Returns whether the command is valid. The position arguments are
+ * only written if the parsing was successful.
+ *
+ * For instance:
+ *   - ";"          returns (<original x>, <original y>).
+ *   - "x1;"        returns (1, <original y>).
+ *   - "y2x1;"      returns (1, 2).
+ *   - "x12y34x56;" returns (56, 34).
+ *   - ""           fails.
+ *   - "x"          fails.
+ *   - "x;"         fails.
+ *   - "x1"         fails.
+ *   - "xy12;"      fails.
+ *   - "x12yy12;"   fails.
+ *   - "xx"         fails.
+ */
+static bool parse_xy(const char *s, unsigned long *x, unsigned long *y)
+{
+	unsigned long new_x = *x;
+	unsigned long new_y = *y;
+	char *p;
+
+	for (;;) {
+		if (!*s)
+			return false;
+
+		if (*s == ';')
+			break;
+
+		if (*s == 'x') {
+			new_x = simple_strtoul(s + 1, &p, 10);
+			if (p == s + 1)
+				return false;
+			s = p;
+		} else if (*s == 'y') {
+			new_y = simple_strtoul(s + 1, &p, 10);
+			if (p == s + 1)
+				return false;
+			s = p;
+		} else {
+			return false;
+		}
+	}
+
+	*x = new_x;
+	*y = new_y;
+	return true;
+}
+
+/*
+ * These are the file operation function for user access to /dev/lcd
+ * This function can also be called from inside the kernel, by
+ * setting file and ppos to NULL.
+ *
+ */
+
+static inline int handle_lcd_special_code(struct charlcd *lcd)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+
+	/* LCD special codes */
+
+	int processed = 0;
+
+	char *esc = priv->esc_seq.buf + 2;
+	int oldflags = priv->flags;
+
+	/* check for display mode flags */
+	switch (*esc) {
+	case 'D':	/* Display ON */
+		priv->flags |= LCD_FLAG_D;
+		if (priv->flags != oldflags)
+			lcd->ops->display(lcd, CHARLCD_ON);
+
+		processed = 1;
+		break;
+	case 'd':	/* Display OFF */
+		priv->flags &= ~LCD_FLAG_D;
+		if (priv->flags != oldflags)
+			lcd->ops->display(lcd, CHARLCD_OFF);
+
+		processed = 1;
+		break;
+	case 'C':	/* Cursor ON */
+		priv->flags |= LCD_FLAG_C;
+		if (priv->flags != oldflags)
+			lcd->ops->cursor(lcd, CHARLCD_ON);
+
+		processed = 1;
+		break;
+	case 'c':	/* Cursor OFF */
+		priv->flags &= ~LCD_FLAG_C;
+		if (priv->flags != oldflags)
+			lcd->ops->cursor(lcd, CHARLCD_OFF);
+
+		processed = 1;
+		break;
+	case 'B':	/* Blink ON */
+		priv->flags |= LCD_FLAG_B;
+		if (priv->flags != oldflags)
+			lcd->ops->blink(lcd, CHARLCD_ON);
+
+		processed = 1;
+		break;
+	case 'b':	/* Blink OFF */
+		priv->flags &= ~LCD_FLAG_B;
+		if (priv->flags != oldflags)
+			lcd->ops->blink(lcd, CHARLCD_OFF);
+
+		processed = 1;
+		break;
+	case '+':	/* Back light ON */
+		priv->flags |= LCD_FLAG_L;
+		if (priv->flags != oldflags)
+			charlcd_backlight(lcd, CHARLCD_ON);
+
+		processed = 1;
+		break;
+	case '-':	/* Back light OFF */
+		priv->flags &= ~LCD_FLAG_L;
+		if (priv->flags != oldflags)
+			charlcd_backlight(lcd, CHARLCD_OFF);
+
+		processed = 1;
+		break;
+	case '*':	/* Flash back light */
+		charlcd_poke(lcd);
+		processed = 1;
+		break;
+	case 'f':	/* Small Font */
+		priv->flags &= ~LCD_FLAG_F;
+		if (priv->flags != oldflags)
+			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_SMALL);
+
+		processed = 1;
+		break;
+	case 'F':	/* Large Font */
+		priv->flags |= LCD_FLAG_F;
+		if (priv->flags != oldflags)
+			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_LARGE);
+
+		processed = 1;
+		break;
+	case 'n':	/* One Line */
+		priv->flags &= ~LCD_FLAG_N;
+		if (priv->flags != oldflags)
+			lcd->ops->lines(lcd, CHARLCD_LINES_1);
+
+		processed = 1;
+		break;
+	case 'N':	/* Two Lines */
+		priv->flags |= LCD_FLAG_N;
+		if (priv->flags != oldflags)
+			lcd->ops->lines(lcd, CHARLCD_LINES_2);
+
+		processed = 1;
+		break;
+	case 'l':	/* Shift Cursor Left */
+		if (lcd->addr.x > 0) {
+			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))
+				lcd->addr.x--;
+		}
+
+		processed = 1;
+		break;
+	case 'r':	/* shift cursor right */
+		if (lcd->addr.x < lcd->width) {
+			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT))
+				lcd->addr.x++;
+		}
+
+		processed = 1;
+		break;
+	case 'L':	/* shift display left */
+		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT);
+		processed = 1;
+		break;
+	case 'R':	/* shift display right */
+		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_RIGHT);
+		processed = 1;
+		break;
+	case 'k': {	/* kill end of line */
+		int x, xs, ys;
+
+		xs = lcd->addr.x;
+		ys = lcd->addr.y;
+		for (x = lcd->addr.x; x < lcd->width; x++)
+			lcd->ops->print(lcd, ' ');
+
+		/* restore cursor position */
+		lcd->addr.x = xs;
+		lcd->addr.y = ys;
+		lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
+		processed = 1;
+		break;
+	}
+	case 'I':	/* reinitialize display */
+		lcd->ops->init_display(lcd);
+		priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
+			LCD_FLAG_C | LCD_FLAG_B;
+		processed = 1;
+		break;
+	case 'G':
+		if (lcd->ops->redefine_char)
+			processed = lcd->ops->redefine_char(lcd, esc);
+		else
+			processed = 1;
+		break;
+
+	case 'x':	/* gotoxy : LxXXX[yYYY]; */
+	case 'y':	/* gotoxy : LyYYY[xXXX]; */
+		if (priv->esc_seq.buf[priv->esc_seq.len - 1] != ';')
+			break;
+
+		/* If the command is valid, move to the new address */
+		if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))
+			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
+
+		/* Regardless of its validity, mark as processed */
+		processed = 1;
+		break;
+	}
+
+	return processed;
+}
+
+static void charlcd_write_char(struct charlcd *lcd, char c)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+
+	/* first, we'll test if we're in escape mode */
+	if ((c != '\n') && priv->esc_seq.len >= 0) {
+		/* yes, let's add this char to the buffer */
+		priv->esc_seq.buf[priv->esc_seq.len++] = c;
+		priv->esc_seq.buf[priv->esc_seq.len] = '\0';
+	} else {
+		/* aborts any previous escape sequence */
+		priv->esc_seq.len = -1;
+
+		switch (c) {
+		case LCD_ESCAPE_CHAR:
+			/* start of an escape sequence */
+			priv->esc_seq.len = 0;
+			priv->esc_seq.buf[priv->esc_seq.len] = '\0';
+			break;
+		case '\b':
+			/* go back one char and clear it */
+			if (lcd->addr.x > 0) {
+				/* back one char */
+				if (!lcd->ops->shift_cursor(lcd,
+							CHARLCD_SHIFT_LEFT))
+					lcd->addr.x--;
+			}
+			/* replace with a space */
+			charlcd_print(lcd, ' ');
+			/* back one char again */
+			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))
+				lcd->addr.x--;
+
+			break;
+		case '\f':
+			/* quickly clear the display */
+			charlcd_clear_display(lcd);
+			break;
+		case '\n':
+			/*
+			 * flush the remainder of the current line and
+			 * go to the beginning of the next line
+			 */
+			for (; lcd->addr.x < lcd->width; lcd->addr.x++)
+				lcd->ops->print(lcd, ' ');
+
+			lcd->addr.x = 0;
+			lcd->addr.y = (lcd->addr.y + 1) % lcd->height;
+			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
+			break;
+		case '\r':
+			/* go to the beginning of the same line */
+			lcd->addr.x = 0;
+			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
+			break;
+		case '\t':
+			/* print a space instead of the tab */
+			charlcd_print(lcd, ' ');
+			break;
+		default:
+			/* simply print this char */
+			charlcd_print(lcd, c);
+			break;
+		}
+	}
+
+	/*
+	 * now we'll see if we're in an escape mode and if the current
+	 * escape sequence can be understood.
+	 */
+	if (priv->esc_seq.len >= 2) {
+		int processed = 0;
+
+		if (!strcmp(priv->esc_seq.buf, "[2J")) {
+			/* clear the display */
+			charlcd_clear_display(lcd);
+			processed = 1;
+		} else if (!strcmp(priv->esc_seq.buf, "[H")) {
+			/* cursor to home */
+			charlcd_home(lcd);
+			processed = 1;
+		}
+		/* codes starting with ^[[L */
+		else if ((priv->esc_seq.len >= 3) &&
+			 (priv->esc_seq.buf[0] == '[') &&
+			 (priv->esc_seq.buf[1] == 'L')) {
+			processed = handle_lcd_special_code(lcd);
+		}
+
+		/* LCD special escape codes */
+		/*
+		 * flush the escape sequence if it's been processed
+		 * or if it is getting too long.
+		 */
+		if (processed || (priv->esc_seq.len >= LCD_ESCAPE_LEN))
+			priv->esc_seq.len = -1;
+	} /* escape codes */
+}
+
+static struct charlcd *the_charlcd;
+
+static ssize_t charlcd_write(struct file *file, const char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	const char __user *tmp = buf;
+	char c;
+
+	for (; count-- > 0; (*ppos)++, tmp++) {
+		if (((count + 1) & 0x1f) == 0) {
+			/*
+			 * charlcd_write() is invoked as a VFS->write() callback
+			 * and as such it is always invoked from preemptible
+			 * context and may sleep.
+			 */
+			cond_resched();
+		}
+
+		if (get_user(c, tmp))
+			return -EFAULT;
+
+		charlcd_write_char(the_charlcd, c);
+	}
+
+	return tmp - buf;
+}
+
+static int charlcd_open(struct inode *inode, struct file *file)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(the_charlcd);
+	int ret;
+
+	ret = -EBUSY;
+	if (!atomic_dec_and_test(&charlcd_available))
+		goto fail;	/* open only once at a time */
+
+	ret = -EPERM;
+	if (file->f_mode & FMODE_READ)	/* device is write-only */
+		goto fail;
+
+	if (priv->must_clear) {
+		priv->lcd.ops->clear_display(&priv->lcd);
+		priv->must_clear = false;
+		priv->lcd.addr.x = 0;
+		priv->lcd.addr.y = 0;
+	}
+	return nonseekable_open(inode, file);
+
+ fail:
+	atomic_inc(&charlcd_available);
+	return ret;
+}
+
+static int charlcd_release(struct inode *inode, struct file *file)
+{
+	atomic_inc(&charlcd_available);
+	return 0;
+}
+
+static const struct file_operations charlcd_fops = {
+	.write   = charlcd_write,
+	.open    = charlcd_open,
+	.release = charlcd_release,
+};
+
+static struct miscdevice charlcd_dev = {
+	.minor	= LCD_MINOR,
+	.name	= "lcd",
+	.fops	= &charlcd_fops,
+};
+
+static void charlcd_puts(struct charlcd *lcd, const char *s)
+{
+	const char *tmp = s;
+	int count = strlen(s);
+
+	for (; count-- > 0; tmp++) {
+		if (((count + 1) & 0x1f) == 0)
+			cond_resched();
+
+		charlcd_write_char(lcd, *tmp);
+	}
+}
+
+#ifdef CONFIG_PANEL_BOOT_MESSAGE
+#define LCD_INIT_TEXT CONFIG_PANEL_BOOT_MESSAGE
+#else
+#define LCD_INIT_TEXT "Linux-" UTS_RELEASE "\n"
+#endif
+
+#ifdef CONFIG_CHARLCD_BL_ON
+#define LCD_INIT_BL "\x1b[L+"
+#elif defined(CONFIG_CHARLCD_BL_FLASH)
+#define LCD_INIT_BL "\x1b[L*"
+#else
+#define LCD_INIT_BL "\x1b[L-"
+#endif
+
+/* initialize the LCD driver */
+static int charlcd_init(struct charlcd *lcd)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+	int ret;
+
+	priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
+		      LCD_FLAG_C | LCD_FLAG_B;
+	if (lcd->ops->backlight) {
+		mutex_init(&priv->bl_tempo_lock);
+		INIT_DELAYED_WORK(&priv->bl_work, charlcd_bl_off);
+	}
+
+	/*
+	 * before this line, we must NOT send anything to the display.
+	 * Since charlcd_init_display() needs to write data, we have to
+	 * enable mark the LCD initialized just before.
+	 */
+	if (WARN_ON(!lcd->ops->init_display))
+		return -EINVAL;
+
+	ret = lcd->ops->init_display(lcd);
+	if (ret)
+		return ret;
+
+	/* display a short message */
+	charlcd_puts(lcd, "\x1b[Lc\x1b[Lb" LCD_INIT_BL LCD_INIT_TEXT);
+
+	/* clear the display on the next device opening */
+	priv->must_clear = true;
+	charlcd_home(lcd);
+	return 0;
+}
+
+static void charlcd_deinit(struct charlcd *lcd)
+{
+	struct charlcd_priv *priv = charlcd_to_priv(lcd);
+
+	if (lcd->ops->backlight) {
+		cancel_delayed_work_sync(&priv->bl_work);
+		lcd->ops->backlight(lcd, CHARLCD_OFF);
+	}
+}
+
+struct charlcd *charlcd_alloc(unsigned int drvdata_size)
+{
+	struct charlcd_priv *priv;
+	struct charlcd *lcd;
+
+	priv = kzalloc(sizeof(*priv) + drvdata_size, GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	priv->esc_seq.len = -1;
+
+	lcd = &priv->lcd;
+	lcd->drvdata = priv->drvdata;
+
+	return lcd;
+}
+EXPORT_SYMBOL_GPL(charlcd_alloc);
+
+void charlcd_free(struct charlcd *lcd)
+{
+	kfree(charlcd_to_priv(lcd));
+}
+EXPORT_SYMBOL_GPL(charlcd_free);
+
+static int panel_notify_sys(struct notifier_block *this, unsigned long code,
+			    void *unused)
+{
+	struct charlcd *lcd = the_charlcd;
+
+	switch (code) {
+	case SYS_DOWN:
+		charlcd_puts(lcd,
+			     "\x0cReloading\nSystem...\x1b[Lc\x1b[Lb\x1b[L+");
+		break;
+	case SYS_HALT:
+		charlcd_puts(lcd, "\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");
+		break;
+	case SYS_POWER_OFF:
+		charlcd_puts(lcd, "\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block panel_notifier = {
+	.notifier_call = panel_notify_sys,
+};
+
+int charlcd_register(struct charlcd *lcd)
+{
+	int ret;
+
+	ret = charlcd_init(lcd);
+	if (ret)
+		return ret;
+
+	ret = misc_register(&charlcd_dev);
+	if (ret) {
+		charlcd_deinit(lcd);
+		return ret;
+	}
+
+	the_charlcd = lcd;
+	register_reboot_notifier(&panel_notifier);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(charlcd_register);
+
+int charlcd_unregister(struct charlcd *lcd)
+{
+	unregister_reboot_notifier(&panel_notifier);
+	charlcd_puts(lcd, "\x0cLCD driver unloaded.\x1b[Lc\x1b[Lb\x1b[L-");
+	misc_deregister(&charlcd_dev);
+	the_charlcd = NULL;
+	charlcd_deinit(lcd);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(charlcd_unregister);
+
+MODULE_DESCRIPTION("Character LCD core support");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h
new file mode 100644
index 000000000..d10b89740
--- /dev/null
+++ b/drivers/auxdisplay/charlcd.h
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Character LCD driver for Linux
+ *
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ */
+
+#ifndef _CHARLCD_H
+#define _CHARLCD_H
+
+#define LCD_FLAG_B		0x0004	/* Blink on */
+#define LCD_FLAG_C		0x0008	/* Cursor on */
+#define LCD_FLAG_D		0x0010	/* Display on */
+#define LCD_FLAG_F		0x0020	/* Large font mode */
+#define LCD_FLAG_N		0x0040	/* 2-rows mode */
+#define LCD_FLAG_L		0x0080	/* Backlight enabled */
+
+enum charlcd_onoff {
+	CHARLCD_OFF = 0,
+	CHARLCD_ON,
+};
+
+enum charlcd_shift_dir {
+	CHARLCD_SHIFT_LEFT,
+	CHARLCD_SHIFT_RIGHT,
+};
+
+enum charlcd_fontsize {
+	CHARLCD_FONTSIZE_SMALL,
+	CHARLCD_FONTSIZE_LARGE,
+};
+
+enum charlcd_lines {
+	CHARLCD_LINES_1,
+	CHARLCD_LINES_2,
+};
+
+struct charlcd_ops;
+
+struct charlcd {
+	const struct charlcd_ops *ops;
+	const unsigned char *char_conv;	/* Optional */
+
+	int height;
+	int width;
+
+	/* Contains the LCD X and Y offset */
+	struct {
+		unsigned long x;
+		unsigned long y;
+	} addr;
+
+	void *drvdata;			/* Set by charlcd_alloc() */
+};
+
+/**
+ * struct charlcd_ops - Functions used by charlcd. Drivers have to implement
+ * these.
+ * @backlight: Turn backlight on or off. Optional.
+ * @print: Print one character to the display at current cursor position.
+ * The buffered cursor position is advanced by charlcd. The cursor should not
+ * wrap to the next line at the end of a line.
+ * @gotoxy: Set cursor to x, y. The x and y values to set the cursor to are
+ * previously set in addr.x and addr.y by charlcd.
+ * @home: Set cursor to 0, 0. The values in addr.x and addr.y are set to 0, 0 by
+ * charlcd prior to calling this function.
+ * @clear_display: Clear the whole display and set the cursor to 0, 0. The
+ * values in addr.x and addr.y are set to 0, 0 by charlcd after to calling this
+ * function.
+ * @init_display: Initialize the display.
+ * @shift_cursor: Shift cursor left or right one position.
+ * @shift_display: Shift whole display content left or right.
+ * @display: Turn display on or off.
+ * @cursor: Turn cursor on or off.
+ * @blink: Turn cursor blink on or off.
+ * @lines: One or two lines.
+ * @redefine_char: Redefine the actual pixel matrix of character.
+ */
+struct charlcd_ops {
+	void (*backlight)(struct charlcd *lcd, enum charlcd_onoff on);
+	int (*print)(struct charlcd *lcd, int c);
+	int (*gotoxy)(struct charlcd *lcd, unsigned int x, unsigned int y);
+	int (*home)(struct charlcd *lcd);
+	int (*clear_display)(struct charlcd *lcd);
+	int (*init_display)(struct charlcd *lcd);
+	int (*shift_cursor)(struct charlcd *lcd, enum charlcd_shift_dir dir);
+	int (*shift_display)(struct charlcd *lcd, enum charlcd_shift_dir dir);
+	int (*display)(struct charlcd *lcd, enum charlcd_onoff on);
+	int (*cursor)(struct charlcd *lcd, enum charlcd_onoff on);
+	int (*blink)(struct charlcd *lcd, enum charlcd_onoff on);
+	int (*fontsize)(struct charlcd *lcd, enum charlcd_fontsize size);
+	int (*lines)(struct charlcd *lcd, enum charlcd_lines lines);
+	int (*redefine_char)(struct charlcd *lcd, char *esc);
+};
+
+void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on);
+
+struct charlcd *charlcd_alloc(unsigned int drvdata_size);
+void charlcd_free(struct charlcd *lcd);
+
+int charlcd_register(struct charlcd *lcd);
+int charlcd_unregister(struct charlcd *lcd);
+
+void charlcd_poke(struct charlcd *lcd);
+
+#endif /* CHARLCD_H */
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
new file mode 100644
index 000000000..3383d2fcf
--- /dev/null
+++ b/drivers/auxdisplay/hd44780.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HD44780 Character LCD driver for Linux
+ *
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+
+#include "charlcd.h"
+#include "hd44780_common.h"
+
+enum hd44780_pin {
+	/* Order does matter due to writing to GPIO array subsets! */
+	PIN_DATA0,	/* Optional */
+	PIN_DATA1,	/* Optional */
+	PIN_DATA2,	/* Optional */
+	PIN_DATA3,	/* Optional */
+	PIN_DATA4,
+	PIN_DATA5,
+	PIN_DATA6,
+	PIN_DATA7,
+	PIN_CTRL_RS,
+	PIN_CTRL_RW,	/* Optional */
+	PIN_CTRL_E,
+	PIN_CTRL_BL,   /* Optional */
+	PIN_NUM
+};
+
+struct hd44780 {
+	struct gpio_desc *pins[PIN_NUM];
+};
+
+static void hd44780_backlight(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+	struct hd44780 *hd = hdc->hd44780;
+
+	if (hd->pins[PIN_CTRL_BL])
+		gpiod_set_value_cansleep(hd->pins[PIN_CTRL_BL], on);
+}
+
+static void hd44780_strobe_gpio(struct hd44780 *hd)
+{
+	/* Maintain the data during 20 us before the strobe */
+	udelay(20);
+
+	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 1);
+
+	/* Maintain the strobe during 40 us */
+	udelay(40);
+
+	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 0);
+}
+
+/* write to an LCD panel register in 8 bit GPIO mode */
+static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
+{
+	DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
+	unsigned int n;
+
+	values[0] = val;
+	__assign_bit(8, values, rs);
+	n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
+
+	/* Present the data to the port */
+	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);
+
+	hd44780_strobe_gpio(hd);
+}
+
+/* write to an LCD panel register in 4 bit GPIO mode */
+static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
+{
+	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
+	unsigned int n;
+
+	/* High nibble + RS, RW */
+	values[0] = val >> 4;
+	__assign_bit(4, values, rs);
+	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
+
+	/* Present the data to the port */
+	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
+
+	hd44780_strobe_gpio(hd);
+
+	/* Low nibble */
+	values[0] &= ~0x0fUL;
+	values[0] |= val & 0x0f;
+
+	/* Present the data to the port */
+	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
+
+	hd44780_strobe_gpio(hd);
+}
+
+/* Send a command to the LCD panel in 8 bit GPIO mode */
+static void hd44780_write_cmd_gpio8(struct hd44780_common *hdc, int cmd)
+{
+	struct hd44780 *hd = hdc->hd44780;
+
+	hd44780_write_gpio8(hd, cmd, 0);
+
+	/* The shortest command takes at least 120 us */
+	udelay(120);
+}
+
+/* Send data to the LCD panel in 8 bit GPIO mode */
+static void hd44780_write_data_gpio8(struct hd44780_common *hdc, int data)
+{
+	struct hd44780 *hd = hdc->hd44780;
+
+	hd44780_write_gpio8(hd, data, 1);
+
+	/* The shortest data takes at least 45 us */
+	udelay(45);
+}
+
+static const struct charlcd_ops hd44780_ops_gpio8 = {
+	.backlight	= hd44780_backlight,
+	.print		= hd44780_common_print,
+	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
+	.clear_display	= hd44780_common_clear_display,
+	.init_display	= hd44780_common_init_display,
+	.shift_cursor	= hd44780_common_shift_cursor,
+	.shift_display	= hd44780_common_shift_display,
+	.display	= hd44780_common_display,
+	.cursor		= hd44780_common_cursor,
+	.blink		= hd44780_common_blink,
+	.fontsize	= hd44780_common_fontsize,
+	.lines		= hd44780_common_lines,
+	.redefine_char	= hd44780_common_redefine_char,
+};
+
+/* Send a command to the LCD panel in 4 bit GPIO mode */
+static void hd44780_write_cmd_gpio4(struct hd44780_common *hdc, int cmd)
+{
+	struct hd44780 *hd = hdc->hd44780;
+
+	hd44780_write_gpio4(hd, cmd, 0);
+
+	/* The shortest command takes at least 120 us */
+	udelay(120);
+}
+
+/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
+static void hd44780_write_cmd_raw_gpio4(struct hd44780_common *hdc, int cmd)
+{
+	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
+	struct hd44780 *hd = hdc->hd44780;
+	unsigned int n;
+
+	/* Command nibble + RS, RW */
+	values[0] = cmd & 0x0f;
+	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
+
+	/* Present the data to the port */
+	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
+
+	hd44780_strobe_gpio(hd);
+}
+
+/* Send data to the LCD panel in 4 bit GPIO mode */
+static void hd44780_write_data_gpio4(struct hd44780_common *hdc, int data)
+{
+	struct hd44780 *hd = hdc->hd44780;
+
+	hd44780_write_gpio4(hd, data, 1);
+
+	/* The shortest data takes at least 45 us */
+	udelay(45);
+}
+
+static const struct charlcd_ops hd44780_ops_gpio4 = {
+	.backlight	= hd44780_backlight,
+	.print		= hd44780_common_print,
+	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
+	.clear_display	= hd44780_common_clear_display,
+	.init_display	= hd44780_common_init_display,
+	.shift_cursor	= hd44780_common_shift_cursor,
+	.shift_display	= hd44780_common_shift_display,
+	.display	= hd44780_common_display,
+	.cursor		= hd44780_common_cursor,
+	.blink		= hd44780_common_blink,
+	.fontsize	= hd44780_common_fontsize,
+	.lines		= hd44780_common_lines,
+	.redefine_char	= hd44780_common_redefine_char,
+};
+
+static int hd44780_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	unsigned int i, base;
+	struct charlcd *lcd;
+	struct hd44780_common *hdc;
+	struct hd44780 *hd;
+	int ifwidth, ret = -ENOMEM;
+
+	/* Required pins */
+	ifwidth = gpiod_count(dev, "data");
+	if (ifwidth < 0)
+		return ifwidth;
+
+	switch (ifwidth) {
+	case 4:
+		base = PIN_DATA4;
+		break;
+	case 8:
+		base = PIN_DATA0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	lcd = hd44780_common_alloc();
+	if (!lcd)
+		return -ENOMEM;
+
+	hd = kzalloc_obj(*hd);
+	if (!hd)
+		goto fail2;
+
+	hdc = lcd->drvdata;
+	hdc->hd44780 = hd;
+
+	for (i = 0; i < ifwidth; i++) {
+		hd->pins[base + i] = devm_gpiod_get_index(dev, "data", i,
+							  GPIOD_OUT_LOW);
+		if (IS_ERR(hd->pins[base + i])) {
+			ret = PTR_ERR(hd->pins[base + i]);
+			goto fail3;
+		}
+	}
+
+	hd->pins[PIN_CTRL_E] = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(hd->pins[PIN_CTRL_E])) {
+		ret = PTR_ERR(hd->pins[PIN_CTRL_E]);
+		goto fail3;
+	}
+
+	hd->pins[PIN_CTRL_RS] = devm_gpiod_get(dev, "rs", GPIOD_OUT_HIGH);
+	if (IS_ERR(hd->pins[PIN_CTRL_RS])) {
+		ret = PTR_ERR(hd->pins[PIN_CTRL_RS]);
+		goto fail3;
+	}
+
+	/* Optional pins */
+	hd->pins[PIN_CTRL_RW] = devm_gpiod_get_optional(dev, "rw",
+							GPIOD_OUT_LOW);
+	if (IS_ERR(hd->pins[PIN_CTRL_RW])) {
+		ret = PTR_ERR(hd->pins[PIN_CTRL_RW]);
+		goto fail3;
+	}
+
+	hd->pins[PIN_CTRL_BL] = devm_gpiod_get_optional(dev, "backlight",
+							GPIOD_OUT_LOW);
+	if (IS_ERR(hd->pins[PIN_CTRL_BL])) {
+		ret = PTR_ERR(hd->pins[PIN_CTRL_BL]);
+		goto fail3;
+	}
+
+	/* Required properties */
+	ret = device_property_read_u32(dev, "display-height-chars",
+				       &lcd->height);
+	if (ret)
+		goto fail3;
+	ret = device_property_read_u32(dev, "display-width-chars", &lcd->width);
+	if (ret)
+		goto fail3;
+
+	/*
+	 * On displays with more than two rows, the internal buffer width is
+	 * usually equal to the display width
+	 */
+	if (lcd->height > 2)
+		hdc->bwidth = lcd->width;
+
+	/* Optional properties */
+	device_property_read_u32(dev, "internal-buffer-width", &hdc->bwidth);
+
+	hdc->ifwidth = ifwidth;
+	if (ifwidth == 8) {
+		lcd->ops = &hd44780_ops_gpio8;
+		hdc->write_data = hd44780_write_data_gpio8;
+		hdc->write_cmd = hd44780_write_cmd_gpio8;
+	} else {
+		lcd->ops = &hd44780_ops_gpio4;
+		hdc->write_data = hd44780_write_data_gpio4;
+		hdc->write_cmd = hd44780_write_cmd_gpio4;
+		hdc->write_cmd_raw4 = hd44780_write_cmd_raw_gpio4;
+	}
+
+	ret = charlcd_register(lcd);
+	if (ret)
+		goto fail3;
+
+	platform_set_drvdata(pdev, lcd);
+	return 0;
+
+fail3:
+	kfree(hd);
+fail2:
+	hd44780_common_free(lcd);
+	return ret;
+}
+
+static void hd44780_remove(struct platform_device *pdev)
+{
+	struct charlcd *lcd = platform_get_drvdata(pdev);
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	charlcd_unregister(lcd);
+	kfree(hdc->hd44780);
+	hd44780_common_free(lcd);
+}
+
+static const struct of_device_id hd44780_of_match[] = {
+	{ .compatible = "hit,hd44780" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, hd44780_of_match);
+
+static struct platform_driver hd44780_driver = {
+	.probe = hd44780_probe,
+	.remove = hd44780_remove,
+	.driver		= {
+		.name	= "hd44780",
+		.of_match_table = hd44780_of_match,
+	},
+};
+
+module_platform_driver(hd44780_driver);
+MODULE_DESCRIPTION("HD44780 Character LCD driver");
+MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c
new file mode 100644
index 000000000..b71db39f9
--- /dev/null
+++ b/drivers/auxdisplay/hd44780_common.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/hex.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "charlcd.h"
+#include "hd44780_common.h"
+
+/* LCD commands */
+#define LCD_CMD_DISPLAY_CLEAR	0x01	/* Clear entire display */
+
+#define LCD_CMD_ENTRY_MODE	0x04	/* Set entry mode */
+#define LCD_CMD_CURSOR_INC	0x02	/* Increment cursor */
+
+#define LCD_CMD_DISPLAY_CTRL	0x08	/* Display control */
+#define LCD_CMD_DISPLAY_ON	0x04	/* Set display on */
+#define LCD_CMD_CURSOR_ON	0x02	/* Set cursor on */
+#define LCD_CMD_BLINK_ON	0x01	/* Set blink on */
+
+#define LCD_CMD_SHIFT		0x10	/* Shift cursor/display */
+#define LCD_CMD_DISPLAY_SHIFT	0x08	/* Shift display instead of cursor */
+#define LCD_CMD_SHIFT_RIGHT	0x04	/* Shift display/cursor to the right */
+
+#define LCD_CMD_FUNCTION_SET	0x20	/* Set function */
+#define LCD_CMD_DATA_LEN_8BITS	0x10	/* Set data length to 8 bits */
+#define LCD_CMD_TWO_LINES	0x08	/* Set to two display lines */
+#define LCD_CMD_FONT_5X10_DOTS	0x04	/* Set char font to 5x10 dots */
+
+#define LCD_CMD_SET_CGRAM_ADDR	0x40	/* Set char generator RAM address */
+
+#define LCD_CMD_SET_DDRAM_ADDR	0x80	/* Set display data RAM address */
+
+/* sleeps that many milliseconds with a reschedule */
+static void long_sleep(int ms)
+{
+	schedule_timeout_interruptible(msecs_to_jiffies(ms));
+}
+
+int hd44780_common_print(struct charlcd *lcd, int c)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (lcd->addr.x < hdc->bwidth) {
+		hdc->write_data(hdc, c);
+		return 0;
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_print);
+
+int hd44780_common_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+	unsigned int addr;
+
+	/*
+	 * we force the cursor to stay at the end of the
+	 * line if it wants to go farther
+	 */
+	addr = x < hdc->bwidth ? x & (hdc->hwidth - 1) : hdc->bwidth - 1;
+	if (y & 1)
+		addr += hdc->hwidth;
+	if (y & 2)
+		addr += hdc->bwidth;
+	hdc->write_cmd(hdc, LCD_CMD_SET_DDRAM_ADDR | addr);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_gotoxy);
+
+int hd44780_common_home(struct charlcd *lcd)
+{
+	return hd44780_common_gotoxy(lcd, 0, 0);
+}
+EXPORT_SYMBOL_GPL(hd44780_common_home);
+
+/* clears the display and resets X/Y */
+int hd44780_common_clear_display(struct charlcd *lcd)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR);
+	/* datasheet says to wait 1,64 milliseconds */
+	long_sleep(2);
+
+	/*
+	 * The Hitachi HD44780 controller (and compatible ones) reset the DDRAM
+	 * address when executing the DISPLAY_CLEAR command, thus the
+	 * following call is not required. However, other controllers do not
+	 * (e.g. NewHaven NHD-0220DZW-AG5), thus move the cursor to home
+	 * unconditionally to support both.
+	 */
+	return hd44780_common_home(lcd);
+}
+EXPORT_SYMBOL_GPL(hd44780_common_clear_display);
+
+int hd44780_common_init_display(struct charlcd *lcd)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	void (*write_cmd_raw)(struct hd44780_common *hdc, int cmd);
+	u8 init;
+
+	if (hdc->ifwidth != 4 && hdc->ifwidth != 8)
+		return -EINVAL;
+
+	hdc->hd44780_common_flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) |
+		LCD_FLAG_D | LCD_FLAG_C | LCD_FLAG_B;
+
+	long_sleep(20);		/* wait 20 ms after power-up for the paranoid */
+
+	/*
+	 * 8-bit mode, 1 line, small fonts; let's do it 3 times, to make sure
+	 * the LCD is in 8-bit mode afterwards
+	 */
+	init = LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS;
+	if (hdc->ifwidth == 4) {
+		init >>= 4;
+		write_cmd_raw = hdc->write_cmd_raw4;
+	} else {
+		write_cmd_raw = hdc->write_cmd;
+	}
+	write_cmd_raw(hdc, init);
+	long_sleep(10);
+	write_cmd_raw(hdc, init);
+	long_sleep(10);
+	write_cmd_raw(hdc, init);
+	long_sleep(10);
+
+	if (hdc->ifwidth == 4) {
+		/* Switch to 4-bit mode, 1 line, small fonts */
+		hdc->write_cmd_raw4(hdc, LCD_CMD_FUNCTION_SET >> 4);
+		long_sleep(10);
+	}
+
+	/* set font height and lines number */
+	hdc->write_cmd(hdc,
+		LCD_CMD_FUNCTION_SET |
+		((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_F) ?
+			LCD_CMD_FONT_5X10_DOTS : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_N) ?
+			LCD_CMD_TWO_LINES : 0));
+	long_sleep(10);
+
+	/* display off, cursor off, blink off */
+	hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CTRL);
+	long_sleep(10);
+
+	hdc->write_cmd(hdc,
+		LCD_CMD_DISPLAY_CTRL |	/* set display mode */
+		((hdc->hd44780_common_flags & LCD_FLAG_D) ?
+			LCD_CMD_DISPLAY_ON : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_C) ?
+			LCD_CMD_CURSOR_ON : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_B) ?
+			LCD_CMD_BLINK_ON : 0));
+
+	charlcd_backlight(lcd,
+			(hdc->hd44780_common_flags & LCD_FLAG_L) ? 1 : 0);
+
+	long_sleep(10);
+
+	/* entry mode set : increment, cursor shifting */
+	hdc->write_cmd(hdc, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC);
+
+	hd44780_common_clear_display(lcd);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_init_display);
+
+int hd44780_common_shift_cursor(struct charlcd *lcd, enum charlcd_shift_dir dir)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (dir == CHARLCD_SHIFT_LEFT) {
+		/* back one char if not at end of line */
+		if (lcd->addr.x < hdc->bwidth)
+			hdc->write_cmd(hdc, LCD_CMD_SHIFT);
+	} else if (dir == CHARLCD_SHIFT_RIGHT) {
+		/* allow the cursor to pass the end of the line */
+		if (lcd->addr.x < (hdc->bwidth - 1))
+			hdc->write_cmd(hdc,
+					LCD_CMD_SHIFT | LCD_CMD_SHIFT_RIGHT);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_shift_cursor);
+
+int hd44780_common_shift_display(struct charlcd *lcd,
+		enum charlcd_shift_dir dir)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (dir == CHARLCD_SHIFT_LEFT)
+		hdc->write_cmd(hdc, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT);
+	else if (dir == CHARLCD_SHIFT_RIGHT)
+		hdc->write_cmd(hdc, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT |
+			LCD_CMD_SHIFT_RIGHT);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_shift_display);
+
+static void hd44780_common_set_mode(struct hd44780_common *hdc)
+{
+	hdc->write_cmd(hdc,
+		LCD_CMD_DISPLAY_CTRL |
+		((hdc->hd44780_common_flags & LCD_FLAG_D) ?
+			LCD_CMD_DISPLAY_ON : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_C) ?
+			LCD_CMD_CURSOR_ON : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_B) ?
+			LCD_CMD_BLINK_ON : 0));
+}
+
+int hd44780_common_display(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (on == CHARLCD_ON)
+		hdc->hd44780_common_flags |= LCD_FLAG_D;
+	else
+		hdc->hd44780_common_flags &= ~LCD_FLAG_D;
+
+	hd44780_common_set_mode(hdc);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_display);
+
+int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (on == CHARLCD_ON)
+		hdc->hd44780_common_flags |= LCD_FLAG_C;
+	else
+		hdc->hd44780_common_flags &= ~LCD_FLAG_C;
+
+	hd44780_common_set_mode(hdc);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_cursor);
+
+int hd44780_common_blink(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (on == CHARLCD_ON)
+		hdc->hd44780_common_flags |= LCD_FLAG_B;
+	else
+		hdc->hd44780_common_flags &= ~LCD_FLAG_B;
+
+	hd44780_common_set_mode(hdc);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_blink);
+
+static void hd44780_common_set_function(struct hd44780_common *hdc)
+{
+	hdc->write_cmd(hdc,
+		LCD_CMD_FUNCTION_SET |
+		((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_F) ?
+			LCD_CMD_FONT_5X10_DOTS : 0) |
+		((hdc->hd44780_common_flags & LCD_FLAG_N) ?
+			LCD_CMD_TWO_LINES : 0));
+}
+
+int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (size == CHARLCD_FONTSIZE_LARGE)
+		hdc->hd44780_common_flags |= LCD_FLAG_F;
+	else
+		hdc->hd44780_common_flags &= ~LCD_FLAG_F;
+
+	hd44780_common_set_function(hdc);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_fontsize);
+
+int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines)
+{
+	struct hd44780_common *hdc = lcd->drvdata;
+
+	if (lines == CHARLCD_LINES_2)
+		hdc->hd44780_common_flags |= LCD_FLAG_N;
+	else
+		hdc->hd44780_common_flags &= ~LCD_FLAG_N;
+
+	hd44780_common_set_function(hdc);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_lines);
+
+int hd44780_common_redefine_char(struct charlcd *lcd, char *esc)
+{
+	/* Generator : LGcxxxxx...xx; must have <c> between '0'
+	 * and '7', representing the numerical ASCII code of the
+	 * redefined character, and <xx...xx> a sequence of 16
+	 * hex digits representing 8 bytes for each character.
+	 * Most LCDs will only use 5 lower bits of the 7 first
+	 * bytes.
+	 */
+
+	struct hd44780_common *hdc = lcd->drvdata;
+	unsigned char cgbytes[8];
+	unsigned char cgaddr;
+	int cgoffset;
+	int shift;
+	char value;
+	int addr;
+
+	if (!strchr(esc, ';'))
+		return 0;
+
+	esc++;
+
+	cgaddr = *(esc++) - '0';
+	if (cgaddr > 7)
+		return 1;
+
+	cgoffset = 0;
+	shift = 0;
+	value = 0;
+	while (*esc && cgoffset < 8) {
+		int half;
+
+		shift ^= 4;
+		half = hex_to_bin(*esc++);
+		if (half < 0)
+			continue;
+
+		value |= half << shift;
+		if (shift == 0) {
+			cgbytes[cgoffset++] = value;
+			value = 0;
+		}
+	}
+
+	hdc->write_cmd(hdc, LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8));
+	for (addr = 0; addr < cgoffset; addr++)
+		hdc->write_data(hdc, cgbytes[addr]);
+
+	/* ensures that we stop writing to CGRAM */
+	lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
+	return 1;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_redefine_char);
+
+struct charlcd *hd44780_common_alloc(void)
+{
+	struct hd44780_common *hdc;
+	struct charlcd *lcd;
+
+	lcd = charlcd_alloc(sizeof(*hdc));
+	if (!lcd)
+		return NULL;
+
+	hdc = lcd->drvdata;
+	hdc->ifwidth = 8;
+	hdc->bwidth = DEFAULT_LCD_BWIDTH;
+	hdc->hwidth = DEFAULT_LCD_HWIDTH;
+	return lcd;
+}
+EXPORT_SYMBOL_GPL(hd44780_common_alloc);
+
+void hd44780_common_free(struct charlcd *lcd)
+{
+	charlcd_free(lcd);
+}
+EXPORT_SYMBOL_GPL(hd44780_common_free);
+
+MODULE_DESCRIPTION("Common functions for HD44780 (and compatibles) LCD displays");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/hd44780_common.h b/drivers/auxdisplay/hd44780_common.h
new file mode 100644
index 000000000..4c87f5572
--- /dev/null
+++ b/drivers/auxdisplay/hd44780_common.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#define DEFAULT_LCD_BWIDTH      40
+#define DEFAULT_LCD_HWIDTH      64
+
+struct hd44780_common {
+	int ifwidth;			/* 4-bit or 8-bit (default) */
+	int bwidth;			/* Default set by hd44780_alloc() */
+	int hwidth;			/* Default set by hd44780_alloc() */
+	unsigned long hd44780_common_flags;
+	void (*write_data)(struct hd44780_common *hdc, int data);
+	void (*write_cmd)(struct hd44780_common *hdc, int cmd);
+	/* write_cmd_raw4 is for 4-bit connected displays only */
+	void (*write_cmd_raw4)(struct hd44780_common *hdc, int cmd);
+	void *hd44780;
+};
+
+int hd44780_common_print(struct charlcd *lcd, int c);
+int hd44780_common_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y);
+int hd44780_common_home(struct charlcd *lcd);
+int hd44780_common_clear_display(struct charlcd *lcd);
+int hd44780_common_init_display(struct charlcd *lcd);
+int hd44780_common_shift_cursor(struct charlcd *lcd,
+		enum charlcd_shift_dir dir);
+int hd44780_common_shift_display(struct charlcd *lcd,
+		enum charlcd_shift_dir dir);
+int hd44780_common_display(struct charlcd *lcd, enum charlcd_onoff on);
+int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on);
+int hd44780_common_blink(struct charlcd *lcd, enum charlcd_onoff on);
+int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size);
+int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines);
+int hd44780_common_redefine_char(struct charlcd *lcd, char *esc);
+
+struct charlcd *hd44780_common_alloc(void);
+void hd44780_common_free(struct charlcd *lcd);
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
new file mode 100644
index 000000000..19b5c14e5
--- /dev/null
+++ b/drivers/auxdisplay/ht16k33.c
@@ -0,0 +1,781 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HT16K33 driver
+ *
+ * Author: Robin van der Gracht <robin@protonic.nl>
+ *
+ * Copyright: (C) 2016 Protonic Holland.
+ * Copyright (C) 2021 Glider bv
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/property.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/container_of.h>
+#include <linux/input.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/mm.h>
+
+#include <linux/map_to_7segment.h>
+#include <linux/map_to_14segment.h>
+
+#include <linux/unaligned.h>
+
+#include "line-display.h"
+
+/* Registers */
+#define REG_SYSTEM_SETUP		0x20
+#define REG_SYSTEM_SETUP_OSC_ON		BIT(0)
+
+#define REG_DISPLAY_SETUP		0x80
+#define REG_DISPLAY_SETUP_ON		BIT(0)
+#define REG_DISPLAY_SETUP_BLINK_OFF	(0 << 1)
+#define REG_DISPLAY_SETUP_BLINK_2HZ	(1 << 1)
+#define REG_DISPLAY_SETUP_BLINK_1HZ	(2 << 1)
+#define REG_DISPLAY_SETUP_BLINK_0HZ5	(3 << 1)
+
+#define REG_ROWINT_SET			0xA0
+#define REG_ROWINT_SET_INT_EN		BIT(0)
+#define REG_ROWINT_SET_INT_ACT_HIGH	BIT(1)
+
+#define REG_BRIGHTNESS			0xE0
+
+/* Defines */
+#define DRIVER_NAME			"ht16k33"
+
+#define MIN_BRIGHTNESS			0x1
+#define MAX_BRIGHTNESS			0x10
+
+#define HT16K33_MATRIX_LED_MAX_COLS	8
+#define HT16K33_MATRIX_LED_MAX_ROWS	16
+#define HT16K33_MATRIX_KEYPAD_MAX_COLS	3
+#define HT16K33_MATRIX_KEYPAD_MAX_ROWS	12
+
+#define BYTES_PER_ROW		(HT16K33_MATRIX_LED_MAX_ROWS / 8)
+#define HT16K33_FB_SIZE		(HT16K33_MATRIX_LED_MAX_COLS * BYTES_PER_ROW)
+
+enum display_type {
+	DISP_MATRIX = 0,
+	DISP_QUAD_7SEG,
+	DISP_QUAD_14SEG,
+};
+
+struct ht16k33_keypad {
+	struct i2c_client *client;
+	struct input_dev *dev;
+	uint32_t cols;
+	uint32_t rows;
+	uint32_t row_shift;
+	uint32_t debounce_ms;
+	uint16_t last_key_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
+
+	wait_queue_head_t wait;
+	bool stopped;
+};
+
+struct ht16k33_fbdev {
+	struct fb_info *info;
+	uint32_t refresh_rate;
+	uint8_t *buffer;
+	uint8_t *cache;
+};
+
+struct ht16k33_priv {
+	struct i2c_client *client;
+	struct delayed_work work;
+	struct led_classdev led;
+	struct ht16k33_keypad keypad;
+	union {
+		struct ht16k33_fbdev fbdev;
+		struct linedisp linedisp;
+	};
+	enum display_type type;
+	uint8_t blink;
+};
+
+#define ht16k33_work_to_priv(p)				\
+	container_of(p, struct ht16k33_priv, work.work)
+
+#define ht16k33_led_to_priv(p)				\
+	container_of(p, struct ht16k33_priv, led)
+
+#define ht16k33_linedisp_to_priv(p)			\
+	container_of(p, struct ht16k33_priv, linedisp)
+
+static const struct fb_fix_screeninfo ht16k33_fb_fix = {
+	.id		= DRIVER_NAME,
+	.type		= FB_TYPE_PACKED_PIXELS,
+	.visual		= FB_VISUAL_MONO10,
+	.xpanstep	= 0,
+	.ypanstep	= 0,
+	.ywrapstep	= 0,
+	.line_length	= HT16K33_MATRIX_LED_MAX_ROWS,
+	.accel		= FB_ACCEL_NONE,
+};
+
+static const struct fb_var_screeninfo ht16k33_fb_var = {
+	.xres = HT16K33_MATRIX_LED_MAX_ROWS,
+	.yres = HT16K33_MATRIX_LED_MAX_COLS,
+	.xres_virtual = HT16K33_MATRIX_LED_MAX_ROWS,
+	.yres_virtual = HT16K33_MATRIX_LED_MAX_COLS,
+	.bits_per_pixel = 1,
+	.red = { 0, 1, 0 },
+	.green = { 0, 1, 0 },
+	.blue = { 0, 1, 0 },
+	.left_margin = 0,
+	.right_margin = 0,
+	.upper_margin = 0,
+	.lower_margin = 0,
+	.vmode = FB_VMODE_NONINTERLACED,
+};
+
+static int ht16k33_display_on(struct ht16k33_priv *priv)
+{
+	uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | priv->blink;
+
+	return i2c_smbus_write_byte(priv->client, data);
+}
+
+static int ht16k33_display_off(struct ht16k33_priv *priv)
+{
+	return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP);
+}
+
+static int ht16k33_brightness_set(struct ht16k33_priv *priv,
+				  unsigned int brightness)
+{
+	int err;
+
+	if (brightness == 0) {
+		priv->blink = REG_DISPLAY_SETUP_BLINK_OFF;
+		return ht16k33_display_off(priv);
+	}
+
+	err = ht16k33_display_on(priv);
+	if (err)
+		return err;
+
+	return i2c_smbus_write_byte(priv->client,
+				    REG_BRIGHTNESS | (brightness - 1));
+}
+
+static int ht16k33_brightness_set_blocking(struct led_classdev *led_cdev,
+					   enum led_brightness brightness)
+{
+	struct ht16k33_priv *priv = ht16k33_led_to_priv(led_cdev);
+
+	return ht16k33_brightness_set(priv, brightness);
+}
+
+static int ht16k33_blink_set(struct led_classdev *led_cdev,
+			     unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct ht16k33_priv *priv = ht16k33_led_to_priv(led_cdev);
+	unsigned int delay;
+	uint8_t blink;
+	int err;
+
+	if (!*delay_on && !*delay_off) {
+		blink = REG_DISPLAY_SETUP_BLINK_1HZ;
+		delay = 1000;
+	} else if (*delay_on <= 750) {
+		blink = REG_DISPLAY_SETUP_BLINK_2HZ;
+		delay = 500;
+	} else if (*delay_on <= 1500) {
+		blink = REG_DISPLAY_SETUP_BLINK_1HZ;
+		delay = 1000;
+	} else {
+		blink = REG_DISPLAY_SETUP_BLINK_0HZ5;
+		delay = 2000;
+	}
+
+	err = i2c_smbus_write_byte(priv->client,
+				   REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON |
+				   blink);
+	if (err)
+		return err;
+
+	priv->blink = blink;
+	*delay_on = *delay_off = delay;
+	return 0;
+}
+
+static void ht16k33_fb_queue(struct ht16k33_priv *priv)
+{
+	struct ht16k33_fbdev *fbdev = &priv->fbdev;
+
+	schedule_delayed_work(&priv->work, HZ / fbdev->refresh_rate);
+}
+
+/*
+ * This gets the fb data from cache and copies it to ht16k33 display RAM
+ */
+static void ht16k33_fb_update(struct work_struct *work)
+{
+	struct ht16k33_priv *priv = ht16k33_work_to_priv(work);
+	struct ht16k33_fbdev *fbdev = &priv->fbdev;
+
+	uint8_t *p1, *p2;
+	int len, pos = 0, first = -1;
+
+	p1 = fbdev->cache;
+	p2 = fbdev->buffer;
+
+	/* Search for the first byte with changes */
+	while (pos < HT16K33_FB_SIZE && first < 0) {
+		if (*(p1++) - *(p2++))
+			first = pos;
+		pos++;
+	}
+
+	/* No changes found */
+	if (first < 0)
+		goto requeue;
+
+	len = HT16K33_FB_SIZE - first;
+	p1 = fbdev->cache + HT16K33_FB_SIZE - 1;
+	p2 = fbdev->buffer + HT16K33_FB_SIZE - 1;
+
+	/* Determine i2c transfer length */
+	while (len > 1) {
+		if (*(p1--) - *(p2--))
+			break;
+		len--;
+	}
+
+	p1 = fbdev->cache + first;
+	p2 = fbdev->buffer + first;
+	if (!i2c_smbus_write_i2c_block_data(priv->client, first, len, p2))
+		memcpy(p1, p2, len);
+requeue:
+	ht16k33_fb_queue(priv);
+}
+
+static int ht16k33_initialize(struct ht16k33_priv *priv)
+{
+	uint8_t data[HT16K33_FB_SIZE];
+	uint8_t byte;
+	int err;
+
+	/* Clear RAM (8 * 16 bits) */
+	memset(data, 0, sizeof(data));
+	err = i2c_smbus_write_block_data(priv->client, 0, sizeof(data), data);
+	if (err)
+		return err;
+
+	/* Turn on internal oscillator */
+	byte = REG_SYSTEM_SETUP_OSC_ON | REG_SYSTEM_SETUP;
+	err = i2c_smbus_write_byte(priv->client, byte);
+	if (err)
+		return err;
+
+	/* Configure INT pin */
+	byte = REG_ROWINT_SET | REG_ROWINT_SET_INT_ACT_HIGH;
+	if (priv->client->irq > 0)
+		byte |= REG_ROWINT_SET_INT_EN;
+	return i2c_smbus_write_byte(priv->client, byte);
+}
+
+static int ht16k33_bl_update_status(struct backlight_device *bl)
+{
+	const int brightness = backlight_get_brightness(bl);
+	struct ht16k33_priv *priv = bl_get_data(bl);
+
+	return ht16k33_brightness_set(priv, brightness);
+}
+
+static const struct backlight_ops ht16k33_bl_ops = {
+	.update_status	= ht16k33_bl_update_status,
+};
+
+/*
+ * Blank events will be passed to the actual device handling the backlight when
+ * we return zero here.
+ */
+static int ht16k33_blank(int blank, struct fb_info *info)
+{
+	return 0;
+}
+
+static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct ht16k33_priv *priv = info->par;
+	struct page *pages = virt_to_page(priv->fbdev.buffer);
+
+	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
+
+	return vm_map_pages_zero(vma, &pages, 1);
+}
+
+static const struct fb_ops ht16k33_fb_ops = {
+	.owner = THIS_MODULE,
+	__FB_DEFAULT_SYSMEM_OPS_RDWR,
+	.fb_blank = ht16k33_blank,
+	__FB_DEFAULT_SYSMEM_OPS_DRAW,
+	.fb_mmap = ht16k33_mmap,
+};
+
+/*
+ * This gets the keys from keypad and reports it to input subsystem.
+ * Returns true if a key is pressed.
+ */
+static bool ht16k33_keypad_scan(struct ht16k33_keypad *keypad)
+{
+	const unsigned short *keycodes = keypad->dev->keycode;
+	u16 new_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
+	__le16 data[HT16K33_MATRIX_KEYPAD_MAX_COLS];
+	unsigned long bits_changed;
+	int row, col, code;
+	int rc;
+	bool pressed = false;
+
+	rc = i2c_smbus_read_i2c_block_data(keypad->client, 0x40,
+					   sizeof(data), (u8 *)data);
+	if (rc != sizeof(data)) {
+		dev_err(&keypad->client->dev,
+			"Failed to read key data, rc=%d\n", rc);
+		return false;
+	}
+
+	for (col = 0; col < keypad->cols; col++) {
+		new_state[col] = le16_to_cpu(data[col]);
+		if (new_state[col])
+			pressed = true;
+		bits_changed = keypad->last_key_state[col] ^ new_state[col];
+
+		for_each_set_bit(row, &bits_changed, BITS_PER_LONG) {
+			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
+			input_event(keypad->dev, EV_MSC, MSC_SCAN, code);
+			input_report_key(keypad->dev, keycodes[code],
+					 new_state[col] & BIT(row));
+		}
+	}
+	input_sync(keypad->dev);
+	memcpy(keypad->last_key_state, new_state, sizeof(u16) * keypad->cols);
+
+	return pressed;
+}
+
+static irqreturn_t ht16k33_keypad_irq_thread(int irq, void *dev)
+{
+	struct ht16k33_keypad *keypad = dev;
+
+	do {
+		wait_event_timeout(keypad->wait, keypad->stopped,
+				    msecs_to_jiffies(keypad->debounce_ms));
+		if (keypad->stopped)
+			break;
+	} while (ht16k33_keypad_scan(keypad));
+
+	return IRQ_HANDLED;
+}
+
+static int ht16k33_keypad_start(struct input_dev *dev)
+{
+	struct ht16k33_keypad *keypad = input_get_drvdata(dev);
+
+	keypad->stopped = false;
+	mb();
+	enable_irq(keypad->client->irq);
+
+	return 0;
+}
+
+static void ht16k33_keypad_stop(struct input_dev *dev)
+{
+	struct ht16k33_keypad *keypad = input_get_drvdata(dev);
+
+	keypad->stopped = true;
+	mb();
+	wake_up(&keypad->wait);
+	disable_irq(keypad->client->irq);
+}
+
+static void ht16k33_seg7_update(struct work_struct *work)
+{
+	struct ht16k33_priv *priv = ht16k33_work_to_priv(work);
+	struct linedisp_map *map = priv->linedisp.map;
+	char *s = priv->linedisp.buf;
+	uint8_t buf[9];
+
+	buf[0] = map_to_seg7(&map->map.seg7, *s++);
+	buf[1] = 0;
+	buf[2] = map_to_seg7(&map->map.seg7, *s++);
+	buf[3] = 0;
+	buf[4] = 0;
+	buf[5] = 0;
+	buf[6] = map_to_seg7(&map->map.seg7, *s++);
+	buf[7] = 0;
+	buf[8] = map_to_seg7(&map->map.seg7, *s++);
+
+	i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf);
+}
+
+static void ht16k33_seg14_update(struct work_struct *work)
+{
+	struct ht16k33_priv *priv = ht16k33_work_to_priv(work);
+	struct linedisp_map *map = priv->linedisp.map;
+	char *s = priv->linedisp.buf;
+	uint8_t buf[8];
+
+	put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 0);
+	put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 2);
+	put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 4);
+	put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 6);
+
+	i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf);
+}
+
+static int ht16k33_linedisp_get_map_type(struct linedisp *linedisp)
+{
+	struct ht16k33_priv *priv = ht16k33_linedisp_to_priv(linedisp);
+
+	switch (priv->type) {
+	case DISP_QUAD_7SEG:
+		INIT_DELAYED_WORK(&priv->work, ht16k33_seg7_update);
+		return LINEDISP_MAP_SEG7;
+
+	case DISP_QUAD_14SEG:
+		INIT_DELAYED_WORK(&priv->work, ht16k33_seg14_update);
+		return LINEDISP_MAP_SEG14;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static void ht16k33_linedisp_update(struct linedisp *linedisp)
+{
+	struct ht16k33_priv *priv = ht16k33_linedisp_to_priv(linedisp);
+
+	schedule_delayed_work(&priv->work, 0);
+}
+
+static const struct linedisp_ops ht16k33_linedisp_ops = {
+	.get_map_type = ht16k33_linedisp_get_map_type,
+	.update = ht16k33_linedisp_update,
+};
+
+static int ht16k33_led_probe(struct device *dev, struct led_classdev *led,
+			     unsigned int brightness)
+{
+	struct led_init_data init_data = {};
+	int err;
+
+	/* The LED is optional */
+	init_data.fwnode = device_get_named_child_node(dev, "led");
+	if (!init_data.fwnode)
+		return 0;
+
+	init_data.devicename = "auxdisplay";
+	init_data.devname_mandatory = true;
+
+	led->brightness_set_blocking = ht16k33_brightness_set_blocking;
+	led->blink_set = ht16k33_blink_set;
+	led->flags = LED_CORE_SUSPENDRESUME;
+	led->brightness = brightness;
+	led->max_brightness = MAX_BRIGHTNESS;
+
+	err = devm_led_classdev_register_ext(dev, led, &init_data);
+	fwnode_handle_put(init_data.fwnode);
+	if (err)
+		dev_err(dev, "Failed to register LED\n");
+
+	return err;
+}
+
+static int ht16k33_keypad_probe(struct i2c_client *client,
+				struct ht16k33_keypad *keypad)
+{
+	struct device *dev = &client->dev;
+	u32 rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS;
+	u32 cols = HT16K33_MATRIX_KEYPAD_MAX_COLS;
+	int err;
+
+	keypad->client = client;
+	init_waitqueue_head(&keypad->wait);
+
+	keypad->dev = devm_input_allocate_device(dev);
+	if (!keypad->dev)
+		return -ENOMEM;
+
+	input_set_drvdata(keypad->dev, keypad);
+
+	keypad->dev->name = DRIVER_NAME"-keypad";
+	keypad->dev->id.bustype = BUS_I2C;
+	keypad->dev->open = ht16k33_keypad_start;
+	keypad->dev->close = ht16k33_keypad_stop;
+
+	if (!device_property_read_bool(dev, "linux,no-autorepeat"))
+		__set_bit(EV_REP, keypad->dev->evbit);
+
+	err = device_property_read_u32(dev, "debounce-delay-ms",
+				       &keypad->debounce_ms);
+	if (err) {
+		dev_err(dev, "key debounce delay not specified\n");
+		return err;
+	}
+
+	err = matrix_keypad_parse_properties(dev, &rows, &cols);
+	if (err)
+		return err;
+	if (rows > HT16K33_MATRIX_KEYPAD_MAX_ROWS ||
+	    cols > HT16K33_MATRIX_KEYPAD_MAX_COLS) {
+		dev_err(dev, "%u rows or %u cols out of range in DT\n", rows,
+			cols);
+		return -ERANGE;
+	}
+
+	keypad->rows = rows;
+	keypad->cols = cols;
+	keypad->row_shift = get_count_order(cols);
+
+	err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL,
+					 keypad->dev);
+	if (err) {
+		dev_err(dev, "failed to build keymap\n");
+		return err;
+	}
+
+	err = devm_request_threaded_irq(dev, client->irq, NULL,
+					ht16k33_keypad_irq_thread,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					DRIVER_NAME, keypad);
+	if (err)
+		return err;
+
+	ht16k33_keypad_stop(keypad->dev);
+
+	return input_register_device(keypad->dev);
+}
+
+static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv,
+			       uint32_t brightness)
+{
+	struct ht16k33_fbdev *fbdev = &priv->fbdev;
+	struct backlight_device *bl = NULL;
+	int err;
+
+	if (priv->led.dev) {
+		err = ht16k33_brightness_set(priv, brightness);
+		if (err)
+			return err;
+	} else {
+		/* backwards compatibility with DT lacking an led subnode */
+		struct backlight_properties bl_props;
+
+		memset(&bl_props, 0, sizeof(struct backlight_properties));
+		bl_props.type = BACKLIGHT_RAW;
+		bl_props.max_brightness = MAX_BRIGHTNESS;
+
+		bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev,
+						    priv, &ht16k33_bl_ops,
+						    &bl_props);
+		if (IS_ERR(bl)) {
+			dev_err(dev, "failed to register backlight\n");
+			return PTR_ERR(bl);
+		}
+
+		bl->props.brightness = brightness;
+		ht16k33_bl_update_status(bl);
+	}
+
+	/* Framebuffer (2 bytes per column) */
+	BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
+	fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
+	if (!fbdev->buffer)
+		return -ENOMEM;
+
+	fbdev->cache = devm_kmalloc(dev, HT16K33_FB_SIZE, GFP_KERNEL);
+	if (!fbdev->cache) {
+		err = -ENOMEM;
+		goto err_fbdev_buffer;
+	}
+
+	fbdev->info = framebuffer_alloc(0, dev);
+	if (!fbdev->info) {
+		err = -ENOMEM;
+		goto err_fbdev_buffer;
+	}
+
+	err = device_property_read_u32(dev, "refresh-rate-hz",
+				       &fbdev->refresh_rate);
+	if (err) {
+		dev_err(dev, "refresh rate not specified\n");
+		goto err_fbdev_info;
+	}
+	fb_bl_default_curve(fbdev->info, 0, MIN_BRIGHTNESS, MAX_BRIGHTNESS);
+
+	INIT_DELAYED_WORK(&priv->work, ht16k33_fb_update);
+	fbdev->info->fbops = &ht16k33_fb_ops;
+	fbdev->info->flags |= FBINFO_VIRTFB;
+	fbdev->info->screen_buffer = fbdev->buffer;
+	fbdev->info->screen_size = HT16K33_FB_SIZE;
+	fbdev->info->fix = ht16k33_fb_fix;
+	fbdev->info->var = ht16k33_fb_var;
+	fbdev->info->bl_dev = bl;
+	fbdev->info->pseudo_palette = NULL;
+	fbdev->info->par = priv;
+
+	err = register_framebuffer(fbdev->info);
+	if (err)
+		goto err_fbdev_info;
+
+	ht16k33_fb_queue(priv);
+	return 0;
+
+err_fbdev_info:
+	framebuffer_release(fbdev->info);
+err_fbdev_buffer:
+	free_page((unsigned long) fbdev->buffer);
+
+	return err;
+}
+
+static int ht16k33_seg_probe(struct device *dev, struct ht16k33_priv *priv,
+			     uint32_t brightness)
+{
+	struct linedisp *linedisp = &priv->linedisp;
+	int err;
+
+	err = ht16k33_brightness_set(priv, brightness);
+	if (err)
+		return err;
+
+	return linedisp_register(linedisp, dev, 4, &ht16k33_linedisp_ops);
+}
+
+static int ht16k33_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct ht16k33_priv *priv;
+	uint32_t dft_brightness;
+	int err;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "i2c_check_functionality error\n");
+		return -EIO;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->client = client;
+	priv->type = (uintptr_t)i2c_get_match_data(client);
+
+	i2c_set_clientdata(client, priv);
+
+	err = ht16k33_initialize(priv);
+	if (err)
+		return err;
+
+	err = device_property_read_u32(dev, "default-brightness-level",
+				       &dft_brightness);
+	if (err) {
+		dft_brightness = MAX_BRIGHTNESS;
+	} else if (dft_brightness > MAX_BRIGHTNESS) {
+		dev_warn(dev,
+			 "invalid default brightness level: %u, using %u\n",
+			 dft_brightness, MAX_BRIGHTNESS);
+		dft_brightness = MAX_BRIGHTNESS;
+	}
+
+	/* LED */
+	err = ht16k33_led_probe(dev, &priv->led, dft_brightness);
+	if (err)
+		return err;
+
+	/* Keypad */
+	if (client->irq > 0) {
+		err = ht16k33_keypad_probe(client, &priv->keypad);
+		if (err)
+			return err;
+	}
+
+	switch (priv->type) {
+	case DISP_MATRIX:
+		/* Frame Buffer Display */
+		err = ht16k33_fbdev_probe(dev, priv, dft_brightness);
+		break;
+
+	case DISP_QUAD_7SEG:
+	case DISP_QUAD_14SEG:
+		/* Segment Display */
+		err = ht16k33_seg_probe(dev, priv, dft_brightness);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return err;
+}
+
+static void ht16k33_remove(struct i2c_client *client)
+{
+	struct ht16k33_priv *priv = i2c_get_clientdata(client);
+	struct ht16k33_fbdev *fbdev = &priv->fbdev;
+
+	cancel_delayed_work_sync(&priv->work);
+
+	switch (priv->type) {
+	case DISP_MATRIX:
+		unregister_framebuffer(fbdev->info);
+		framebuffer_release(fbdev->info);
+		free_page((unsigned long)fbdev->buffer);
+		break;
+
+	case DISP_QUAD_7SEG:
+	case DISP_QUAD_14SEG:
+		linedisp_unregister(&priv->linedisp);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static const struct i2c_device_id ht16k33_i2c_match[] = {
+	{ "3108", DISP_QUAD_7SEG },
+	{ "3130", DISP_QUAD_14SEG },
+	{ "ht16k33", DISP_MATRIX },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ht16k33_i2c_match);
+
+static const struct of_device_id ht16k33_of_match[] = {
+	{
+		/* 0.56" 4-Digit 7-Segment FeatherWing Display (Red) */
+		.compatible = "adafruit,3108", .data = (void *)DISP_QUAD_7SEG,
+	}, {
+		/* 0.54" Quad Alphanumeric FeatherWing Display (Red) */
+		.compatible = "adafruit,3130", .data = (void *)DISP_QUAD_14SEG,
+	}, {
+		/* Generic, assumed Dot-Matrix Display */
+		.compatible = "holtek,ht16k33", .data = (void *)DISP_MATRIX,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ht16k33_of_match);
+
+static struct i2c_driver ht16k33_driver = {
+	.probe		= ht16k33_probe,
+	.remove		= ht16k33_remove,
+	.driver		= {
+		.name		= DRIVER_NAME,
+		.of_match_table	= ht16k33_of_match,
+	},
+	.id_table = ht16k33_i2c_match,
+};
+module_i2c_driver(ht16k33_driver);
+
+MODULE_DESCRIPTION("Holtek HT16K33 driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("LINEDISP");
+MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>");
diff --git a/drivers/auxdisplay/img-ascii-lcd.c b/drivers/auxdisplay/img-ascii-lcd.c
new file mode 100644
index 000000000..32e1863ef
--- /dev/null
+++ b/drivers/auxdisplay/img-ascii-lcd.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "line-display.h"
+
+struct img_ascii_lcd_ctx;
+
+/**
+ * struct img_ascii_lcd_config - Configuration information about an LCD model
+ * @num_chars: the number of characters the LCD can display
+ * @external_regmap: true if registers are in a system controller, else false
+ * @ops: character line display operations
+ */
+struct img_ascii_lcd_config {
+	unsigned int num_chars;
+	bool external_regmap;
+	const struct linedisp_ops ops;
+};
+
+/**
+ * struct img_ascii_lcd_ctx - Private data structure
+ * @linedisp: line display structure
+ * @base: the base address of the LCD registers
+ * @regmap: the regmap through which LCD registers are accessed
+ * @offset: the offset within regmap to the start of the LCD registers
+ */
+struct img_ascii_lcd_ctx {
+	struct linedisp linedisp;
+	union {
+		void __iomem *base;
+		struct regmap *regmap;
+	};
+	u32 offset;
+};
+
+/*
+ * MIPS Boston development board
+ */
+
+static void boston_update(struct linedisp *linedisp)
+{
+	struct img_ascii_lcd_ctx *ctx =
+		container_of(linedisp, struct img_ascii_lcd_ctx, linedisp);
+	ulong val;
+
+#if BITS_PER_LONG == 64
+	val = *((u64 *)&linedisp->buf[0]);
+	__raw_writeq(val, ctx->base);
+#elif BITS_PER_LONG == 32
+	val = *((u32 *)&linedisp->buf[0]);
+	__raw_writel(val, ctx->base);
+	val = *((u32 *)&linedisp->buf[4]);
+	__raw_writel(val, ctx->base + 4);
+#else
+# error Not 32 or 64 bit
+#endif
+}
+
+static const struct img_ascii_lcd_config boston_config = {
+	.num_chars = 8,
+	.ops = {
+		.update = boston_update,
+	},
+};
+
+/*
+ * MIPS Malta development board
+ */
+
+static void malta_update(struct linedisp *linedisp)
+{
+	struct img_ascii_lcd_ctx *ctx =
+		container_of(linedisp, struct img_ascii_lcd_ctx, linedisp);
+	unsigned int i;
+	int err = 0;
+
+	for (i = 0; i < linedisp->num_chars; i++) {
+		err = regmap_write(ctx->regmap,
+				   ctx->offset + (i * 8), linedisp->buf[i]);
+		if (err)
+			break;
+	}
+
+	if (unlikely(err))
+		pr_err_ratelimited("Failed to update LCD display: %d\n", err);
+}
+
+static const struct img_ascii_lcd_config malta_config = {
+	.num_chars = 8,
+	.external_regmap = true,
+	.ops = {
+		.update = malta_update,
+	},
+};
+
+/*
+ * MIPS SEAD3 development board
+ */
+
+enum {
+	SEAD3_REG_LCD_CTRL		= 0x00,
+#define SEAD3_REG_LCD_CTRL_SETDRAM	BIT(7)
+	SEAD3_REG_LCD_DATA		= 0x08,
+	SEAD3_REG_CPLD_STATUS		= 0x10,
+#define SEAD3_REG_CPLD_STATUS_BUSY	BIT(0)
+	SEAD3_REG_CPLD_DATA		= 0x18,
+#define SEAD3_REG_CPLD_DATA_BUSY	BIT(7)
+};
+
+static int sead3_wait_sm_idle(struct img_ascii_lcd_ctx *ctx)
+{
+	unsigned int status;
+	int err;
+
+	do {
+		err = regmap_read(ctx->regmap,
+				  ctx->offset + SEAD3_REG_CPLD_STATUS,
+				  &status);
+		if (err)
+			return err;
+	} while (status & SEAD3_REG_CPLD_STATUS_BUSY);
+
+	return 0;
+
+}
+
+static int sead3_wait_lcd_idle(struct img_ascii_lcd_ctx *ctx)
+{
+	unsigned int cpld_data;
+	int err;
+
+	err = sead3_wait_sm_idle(ctx);
+	if (err)
+		return err;
+
+	do {
+		err = regmap_read(ctx->regmap,
+				  ctx->offset + SEAD3_REG_LCD_CTRL,
+				  &cpld_data);
+		if (err)
+			return err;
+
+		err = sead3_wait_sm_idle(ctx);
+		if (err)
+			return err;
+
+		err = regmap_read(ctx->regmap,
+				  ctx->offset + SEAD3_REG_CPLD_DATA,
+				  &cpld_data);
+		if (err)
+			return err;
+	} while (cpld_data & SEAD3_REG_CPLD_DATA_BUSY);
+
+	return 0;
+}
+
+static void sead3_update(struct linedisp *linedisp)
+{
+	struct img_ascii_lcd_ctx *ctx =
+		container_of(linedisp, struct img_ascii_lcd_ctx, linedisp);
+	unsigned int i;
+	int err = 0;
+
+	for (i = 0; i < linedisp->num_chars; i++) {
+		err = sead3_wait_lcd_idle(ctx);
+		if (err)
+			break;
+
+		err = regmap_write(ctx->regmap,
+				   ctx->offset + SEAD3_REG_LCD_CTRL,
+				   SEAD3_REG_LCD_CTRL_SETDRAM | i);
+		if (err)
+			break;
+
+		err = sead3_wait_lcd_idle(ctx);
+		if (err)
+			break;
+
+		err = regmap_write(ctx->regmap,
+				   ctx->offset + SEAD3_REG_LCD_DATA,
+				   linedisp->buf[i]);
+		if (err)
+			break;
+	}
+
+	if (unlikely(err))
+		pr_err_ratelimited("Failed to update LCD display: %d\n", err);
+}
+
+static const struct img_ascii_lcd_config sead3_config = {
+	.num_chars = 16,
+	.external_regmap = true,
+	.ops = {
+		.update = sead3_update,
+	},
+};
+
+static const struct of_device_id img_ascii_lcd_matches[] = {
+	{ .compatible = "img,boston-lcd", .data = &boston_config },
+	{ .compatible = "mti,malta-lcd", .data = &malta_config },
+	{ .compatible = "mti,sead3-lcd", .data = &sead3_config },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, img_ascii_lcd_matches);
+
+/**
+ * img_ascii_lcd_probe() - probe an LCD display device
+ * @pdev: the LCD platform device
+ *
+ * Probe an LCD display device, ensuring that we have the required resources in
+ * order to access the LCD & setting up private data as well as sysfs files.
+ *
+ * Return: 0 on success, else -ERRNO
+ */
+static int img_ascii_lcd_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct img_ascii_lcd_config *cfg = device_get_match_data(dev);
+	struct img_ascii_lcd_ctx *ctx;
+	int err;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	if (cfg->external_regmap) {
+		ctx->regmap = syscon_node_to_regmap(dev->parent->of_node);
+		if (IS_ERR(ctx->regmap))
+			return PTR_ERR(ctx->regmap);
+
+		if (of_property_read_u32(dev->of_node, "offset", &ctx->offset))
+			return -EINVAL;
+	} else {
+		ctx->base = devm_platform_ioremap_resource(pdev, 0);
+		if (IS_ERR(ctx->base))
+			return PTR_ERR(ctx->base);
+	}
+
+	err = linedisp_register(&ctx->linedisp, dev, cfg->num_chars, &cfg->ops);
+	if (err)
+		return err;
+
+	/* for backwards compatibility */
+	err = compat_only_sysfs_link_entry_to_kobj(&dev->kobj,
+						   &ctx->linedisp.dev.kobj,
+						   "message", NULL);
+	if (err)
+		goto err_unregister;
+
+	platform_set_drvdata(pdev, ctx);
+	return 0;
+
+err_unregister:
+	linedisp_unregister(&ctx->linedisp);
+	return err;
+}
+
+/**
+ * img_ascii_lcd_remove() - remove an LCD display device
+ * @pdev: the LCD platform device
+ *
+ * Remove an LCD display device, freeing private resources & ensuring that the
+ * driver stops using the LCD display registers.
+ */
+static void img_ascii_lcd_remove(struct platform_device *pdev)
+{
+	struct img_ascii_lcd_ctx *ctx = platform_get_drvdata(pdev);
+
+	sysfs_remove_link(&pdev->dev.kobj, "message");
+	linedisp_unregister(&ctx->linedisp);
+}
+
+static struct platform_driver img_ascii_lcd_driver = {
+	.driver = {
+		.name		= "img-ascii-lcd",
+		.of_match_table	= img_ascii_lcd_matches,
+	},
+	.probe	= img_ascii_lcd_probe,
+	.remove = img_ascii_lcd_remove,
+};
+module_platform_driver(img_ascii_lcd_driver);
+
+MODULE_DESCRIPTION("Imagination Technologies ASCII LCD Display");
+MODULE_AUTHOR("Paul Burton <paul.burton@mips.com>");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("LINEDISP");
diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
new file mode 100644
index 000000000..51587f0fd
--- /dev/null
+++ b/drivers/auxdisplay/ks0108.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *    Filename: ks0108.c
+ *     Version: 0.1.0
+ * Description: ks0108 LCD Controller driver
+ *     Depends: parport
+ *
+ *      Author: Copyright (C) Miguel Ojeda <ojeda@kernel.org>
+ *        Date: 2006-10-31
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/parport.h>
+#include <linux/ks0108.h>
+
+#define KS0108_NAME "ks0108"
+
+/*
+ * Module Parameters
+ */
+
+static unsigned int ks0108_port = CONFIG_KS0108_PORT;
+module_param(ks0108_port, uint, 0444);
+MODULE_PARM_DESC(ks0108_port, "Parallel port where the LCD is connected");
+
+static unsigned int ks0108_delay = CONFIG_KS0108_DELAY;
+module_param(ks0108_delay, uint, 0444);
+MODULE_PARM_DESC(ks0108_delay, "Delay between each control writing (microseconds)");
+
+/*
+ * Device
+ */
+
+static struct parport *ks0108_parport;
+static struct pardevice *ks0108_pardevice;
+
+/*
+ * ks0108 Exported Commands (don't lock)
+ *
+ *   You _should_ lock in the top driver: This functions _should not_
+ *   get race conditions in any way. Locking for each byte here would be
+ *   so slow and useless.
+ *
+ *   There are not bit definitions because they are not flags,
+ *   just arbitrary combinations defined by the documentation for each
+ *   function in the ks0108 LCD controller. If you want to know what means
+ *   a specific combination, look at the function's name.
+ *
+ *   The ks0108_writecontrol bits need to be reverted ^(0,1,3) because
+ *   the parallel port also revert them using a "not" logic gate.
+ */
+
+#define bit(n) (((unsigned char)1)<<(n))
+
+void ks0108_writedata(unsigned char byte)
+{
+	parport_write_data(ks0108_parport, byte);
+}
+
+void ks0108_writecontrol(unsigned char byte)
+{
+	udelay(ks0108_delay);
+	parport_write_control(ks0108_parport, byte ^ (bit(0) | bit(1) | bit(3)));
+}
+
+void ks0108_displaystate(unsigned char state)
+{
+	ks0108_writedata((state ? bit(0) : 0) | bit(1) | bit(2) | bit(3) | bit(4) | bit(5));
+}
+
+void ks0108_startline(unsigned char startline)
+{
+	ks0108_writedata(min_t(unsigned char, startline, 63) | bit(6) |
+			 bit(7));
+}
+
+void ks0108_address(unsigned char address)
+{
+	ks0108_writedata(min_t(unsigned char, address, 63) | bit(6));
+}
+
+void ks0108_page(unsigned char page)
+{
+	ks0108_writedata(min_t(unsigned char, page, 7) | bit(3) | bit(4) |
+			 bit(5) | bit(7));
+}
+
+EXPORT_SYMBOL_GPL(ks0108_writedata);
+EXPORT_SYMBOL_GPL(ks0108_writecontrol);
+EXPORT_SYMBOL_GPL(ks0108_displaystate);
+EXPORT_SYMBOL_GPL(ks0108_startline);
+EXPORT_SYMBOL_GPL(ks0108_address);
+EXPORT_SYMBOL_GPL(ks0108_page);
+
+/*
+ * Is the module inited?
+ */
+
+static unsigned char ks0108_inited;
+unsigned char ks0108_isinited(void)
+{
+	return ks0108_inited;
+}
+EXPORT_SYMBOL_GPL(ks0108_isinited);
+
+static void ks0108_parport_attach(struct parport *port)
+{
+	struct pardev_cb ks0108_cb;
+
+	if (port->base != ks0108_port)
+		return;
+
+	memset(&ks0108_cb, 0, sizeof(ks0108_cb));
+	ks0108_cb.flags = PARPORT_DEV_EXCL;
+	ks0108_pardevice = parport_register_dev_model(port, KS0108_NAME,
+						      &ks0108_cb, 0);
+	if (!ks0108_pardevice) {
+		pr_err("ERROR: parport didn't register new device\n");
+		return;
+	}
+	if (parport_claim(ks0108_pardevice)) {
+		pr_err("could not claim access to parport %i. Aborting.\n",
+		       ks0108_port);
+		goto err_unreg_device;
+	}
+
+	ks0108_parport = port;
+	ks0108_inited = 1;
+	return;
+
+err_unreg_device:
+	parport_unregister_device(ks0108_pardevice);
+	ks0108_pardevice = NULL;
+}
+
+static void ks0108_parport_detach(struct parport *port)
+{
+	if (port->base != ks0108_port)
+		return;
+
+	if (!ks0108_pardevice) {
+		pr_err("%s: already unregistered.\n", KS0108_NAME);
+		return;
+	}
+
+	parport_release(ks0108_pardevice);
+	parport_unregister_device(ks0108_pardevice);
+	ks0108_pardevice = NULL;
+	ks0108_parport = NULL;
+}
+
+/*
+ * Module Init & Exit
+ */
+
+static struct parport_driver ks0108_parport_driver = {
+	.name = "ks0108",
+	.match_port = ks0108_parport_attach,
+	.detach = ks0108_parport_detach,
+};
+module_parport_driver(ks0108_parport_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
+MODULE_DESCRIPTION("ks0108 LCD Controller driver");
+
diff --git a/drivers/auxdisplay/lcd2s.c b/drivers/auxdisplay/lcd2s.c
new file mode 100644
index 000000000..7b65f4306
--- /dev/null
+++ b/drivers/auxdisplay/lcd2s.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Console driver for LCD2S 4x20 character displays connected through i2c.
+ *  The display also has a SPI interface, but the driver does not support
+ *  this yet.
+ *
+ *  This is a driver allowing you to use a LCD2S 4x20 from Modtronix
+ *  engineering as auxdisplay character device.
+ *
+ *  (C) 2019 by Lemonage Software GmbH
+ *  Author: Lars Pöschel <poeschel@lemonage.de>
+ *  All rights reserved.
+ */
+#include <linux/hex.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+
+#include "charlcd.h"
+
+#define LCD2S_CMD_CUR_MOVES_FWD		0x09
+#define LCD2S_CMD_CUR_BLINK_OFF		0x10
+#define LCD2S_CMD_CUR_UL_OFF		0x11
+#define LCD2S_CMD_DISPLAY_OFF		0x12
+#define LCD2S_CMD_CUR_BLINK_ON		0x18
+#define LCD2S_CMD_CUR_UL_ON		0x19
+#define LCD2S_CMD_DISPLAY_ON		0x1a
+#define LCD2S_CMD_BACKLIGHT_OFF		0x20
+#define LCD2S_CMD_BACKLIGHT_ON		0x28
+#define LCD2S_CMD_WRITE			0x80
+#define LCD2S_CMD_MOV_CUR_RIGHT		0x83
+#define LCD2S_CMD_MOV_CUR_LEFT		0x84
+#define LCD2S_CMD_SHIFT_RIGHT		0x85
+#define LCD2S_CMD_SHIFT_LEFT		0x86
+#define LCD2S_CMD_SHIFT_UP		0x87
+#define LCD2S_CMD_SHIFT_DOWN		0x88
+#define LCD2S_CMD_CUR_ADDR		0x89
+#define LCD2S_CMD_CUR_POS		0x8a
+#define LCD2S_CMD_CUR_RESET		0x8b
+#define LCD2S_CMD_CLEAR			0x8c
+#define LCD2S_CMD_DEF_CUSTOM_CHAR	0x92
+#define LCD2S_CMD_READ_STATUS		0xd0
+
+#define LCD2S_CHARACTER_SIZE		8
+
+#define LCD2S_STATUS_BUF_MASK		0x7f
+
+struct lcd2s_data {
+	struct i2c_client *i2c;
+	struct charlcd *charlcd;
+};
+
+static s32 lcd2s_wait_buf_free(const struct i2c_client *client, int count)
+{
+	s32 status;
+
+	status = i2c_smbus_read_byte_data(client, LCD2S_CMD_READ_STATUS);
+	if (status < 0)
+		return status;
+
+	while ((status & LCD2S_STATUS_BUF_MASK) < count) {
+		mdelay(1);
+		status = i2c_smbus_read_byte_data(client,
+						  LCD2S_CMD_READ_STATUS);
+		if (status < 0)
+			return status;
+	}
+	return 0;
+}
+
+static int lcd2s_i2c_master_send(const struct i2c_client *client,
+				 const char *buf, int count)
+{
+	s32 status;
+
+	status = lcd2s_wait_buf_free(client, count);
+	if (status < 0)
+		return status;
+
+	return i2c_master_send(client, buf, count);
+}
+
+static int lcd2s_i2c_smbus_write_byte(const struct i2c_client *client, u8 value)
+{
+	s32 status;
+
+	status = lcd2s_wait_buf_free(client, 1);
+	if (status < 0)
+		return status;
+
+	return i2c_smbus_write_byte(client, value);
+}
+
+static int lcd2s_print(struct charlcd *lcd, int c)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+	u8 buf[2] = { LCD2S_CMD_WRITE, c };
+	int ret;
+
+	ret = lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+	if (ret != sizeof(buf))
+		return -EIO;
+	return 0;
+}
+
+static int lcd2s_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+	u8 buf[3] = { LCD2S_CMD_CUR_POS, y + 1, x + 1 };
+	int ret;
+
+	ret = lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+	if (ret != sizeof(buf))
+		return -EIO;
+	return 0;
+}
+
+static int lcd2s_home(struct charlcd *lcd)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_RESET);
+	return 0;
+}
+
+static int lcd2s_init_display(struct charlcd *lcd)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	/* turn everything off, but display on */
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_ON);
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_OFF);
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_MOVES_FWD);
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_OFF);
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_OFF);
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CLEAR);
+
+	return 0;
+}
+
+static int lcd2s_shift_cursor(struct charlcd *lcd, enum charlcd_shift_dir dir)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (dir == CHARLCD_SHIFT_LEFT)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_MOV_CUR_LEFT);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_MOV_CUR_RIGHT);
+
+	return 0;
+}
+
+static int lcd2s_shift_display(struct charlcd *lcd, enum charlcd_shift_dir dir)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (dir == CHARLCD_SHIFT_LEFT)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_SHIFT_LEFT);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_SHIFT_RIGHT);
+
+	return 0;
+}
+
+static void lcd2s_backlight(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (on)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_ON);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_OFF);
+}
+
+static int lcd2s_display(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (on)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_ON);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_OFF);
+
+	return 0;
+}
+
+static int lcd2s_cursor(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (on)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_ON);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_OFF);
+
+	return 0;
+}
+
+static int lcd2s_blink(struct charlcd *lcd, enum charlcd_onoff on)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	if (on)
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_ON);
+	else
+		lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_OFF);
+
+	return 0;
+}
+
+static int lcd2s_fontsize(struct charlcd *lcd, enum charlcd_fontsize size)
+{
+	return 0;
+}
+
+static int lcd2s_lines(struct charlcd *lcd, enum charlcd_lines lines)
+{
+	return 0;
+}
+
+/*
+ * Generator: LGcxxxxx...xx; must have <c> between '0' and '7',
+ * representing the numerical ASCII code of the redefined character,
+ * and <xx...xx> a sequence of 16 hex digits representing 8 bytes
+ * for each character. Most LCDs will only use 5 lower bits of
+ * the 7 first bytes.
+ */
+static int lcd2s_redefine_char(struct charlcd *lcd, char *esc)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+	u8 buf[LCD2S_CHARACTER_SIZE + 2] = { LCD2S_CMD_DEF_CUSTOM_CHAR };
+	u8 value;
+	int shift, i;
+
+	if (!strchr(esc, ';'))
+		return 0;
+
+	esc++;
+
+	buf[1] = *(esc++) - '0';
+	if (buf[1] > 7)
+		return 1;
+
+	i = 2;
+	shift = 0;
+	value = 0;
+	while (*esc && i < LCD2S_CHARACTER_SIZE + 2) {
+		int half;
+
+		shift ^= 4;
+		half = hex_to_bin(*esc++);
+		if (half < 0)
+			continue;
+
+		value |= half << shift;
+		if (shift == 0) {
+			buf[i++] = value;
+			value = 0;
+		}
+	}
+
+	lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
+	return 1;
+}
+
+static int lcd2s_clear_display(struct charlcd *lcd)
+{
+	struct lcd2s_data *lcd2s = lcd->drvdata;
+
+	/* This implicitly sets cursor to first row and column */
+	lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CLEAR);
+	return 0;
+}
+
+static const struct charlcd_ops lcd2s_ops = {
+	.print		= lcd2s_print,
+	.backlight	= lcd2s_backlight,
+	.gotoxy		= lcd2s_gotoxy,
+	.home		= lcd2s_home,
+	.clear_display	= lcd2s_clear_display,
+	.init_display	= lcd2s_init_display,
+	.shift_cursor	= lcd2s_shift_cursor,
+	.shift_display	= lcd2s_shift_display,
+	.display	= lcd2s_display,
+	.cursor		= lcd2s_cursor,
+	.blink		= lcd2s_blink,
+	.fontsize	= lcd2s_fontsize,
+	.lines		= lcd2s_lines,
+	.redefine_char	= lcd2s_redefine_char,
+};
+
+static int lcd2s_i2c_probe(struct i2c_client *i2c)
+{
+	struct charlcd *lcd;
+	struct lcd2s_data *lcd2s;
+	int err;
+
+	if (!i2c_check_functionality(i2c->adapter,
+			I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
+			I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
+		return -EIO;
+
+	/* Test, if the display is responding */
+	err = lcd2s_i2c_smbus_write_byte(i2c, LCD2S_CMD_DISPLAY_OFF);
+	if (err < 0)
+		return err;
+
+	lcd = charlcd_alloc(sizeof(*lcd2s));
+	if (!lcd)
+		return -ENOMEM;
+
+	lcd->ops = &lcd2s_ops;
+
+	lcd2s = lcd->drvdata;
+	lcd2s->i2c = i2c;
+	lcd2s->charlcd = lcd;
+
+	/* Required properties */
+	err = device_property_read_u32(&i2c->dev, "display-height-chars",
+			&lcd->height);
+	if (err)
+		goto fail1;
+
+	err = device_property_read_u32(&i2c->dev, "display-width-chars",
+			&lcd->width);
+	if (err)
+		goto fail1;
+
+	err = charlcd_register(lcd2s->charlcd);
+	if (err)
+		goto fail1;
+
+	i2c_set_clientdata(i2c, lcd2s);
+	return 0;
+
+fail1:
+	charlcd_free(lcd2s->charlcd);
+	return err;
+}
+
+static void lcd2s_i2c_remove(struct i2c_client *i2c)
+{
+	struct lcd2s_data *lcd2s = i2c_get_clientdata(i2c);
+
+	charlcd_unregister(lcd2s->charlcd);
+	charlcd_free(lcd2s->charlcd);
+}
+
+static const struct i2c_device_id lcd2s_i2c_id[] = {
+	{ "lcd2s" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lcd2s_i2c_id);
+
+static const struct of_device_id lcd2s_of_table[] = {
+	{ .compatible = "modtronix,lcd2s" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lcd2s_of_table);
+
+static struct i2c_driver lcd2s_i2c_driver = {
+	.driver = {
+		.name = "lcd2s",
+		.of_match_table = lcd2s_of_table,
+	},
+	.probe = lcd2s_i2c_probe,
+	.remove = lcd2s_i2c_remove,
+	.id_table = lcd2s_i2c_id,
+};
+module_i2c_driver(lcd2s_i2c_driver);
+
+MODULE_DESCRIPTION("LCD2S character display driver");
+MODULE_AUTHOR("Lars Poeschel");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/line-display.c b/drivers/auxdisplay/line-display.c
new file mode 100644
index 000000000..915eb5cd9
--- /dev/null
+++ b/drivers/auxdisplay/line-display.c
@@ -0,0 +1,596 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Character line display core support
+ *
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ *
+ * Copyright (C) 2021 Glider bv
+ * Copyright (C) 2025 Jean-François Lessard
+ */
+
+#ifndef CONFIG_PANEL_BOOT_MESSAGE
+#include <generated/utsrelease.h>
+#endif
+
+#include <linux/cleanup.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/idr.h>
+#include <linux/jiffies.h>
+#include <linux/kstrtox.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/timer.h>
+
+#include <linux/map_to_7segment.h>
+#include <linux/map_to_14segment.h>
+
+#include "line-display.h"
+
+#define DEFAULT_SCROLL_RATE	(HZ / 2)
+
+/**
+ * struct linedisp_attachment - Holds the device to linedisp mapping
+ * @list: List entry for the linedisp_attachments list
+ * @device: Pointer to the device where linedisp attributes are added
+ * @linedisp: Pointer to the linedisp mapped to the device
+ * @direct: true for directly attached device using linedisp_attach(),
+ *	    false for child registered device using linedisp_register()
+ */
+struct linedisp_attachment {
+	struct list_head list;
+	struct device *device;
+	struct linedisp *linedisp;
+	bool direct;
+};
+
+static LIST_HEAD(linedisp_attachments);
+static DEFINE_SPINLOCK(linedisp_attachments_lock);
+
+static int create_attachment(struct device *dev, struct linedisp *linedisp, bool direct)
+{
+	struct linedisp_attachment *attachment;
+
+	attachment = kzalloc_obj(*attachment);
+	if (!attachment)
+		return -ENOMEM;
+
+	attachment->device = dev;
+	attachment->linedisp = linedisp;
+	attachment->direct = direct;
+
+	guard(spinlock)(&linedisp_attachments_lock);
+	list_add(&attachment->list, &linedisp_attachments);
+
+	return 0;
+}
+
+static struct linedisp *delete_attachment(struct device *dev, bool direct)
+{
+	struct linedisp_attachment *attachment;
+	struct linedisp *linedisp;
+
+	guard(spinlock)(&linedisp_attachments_lock);
+
+	list_for_each_entry(attachment, &linedisp_attachments, list) {
+		if (attachment->device == dev &&
+		    attachment->direct == direct)
+			break;
+	}
+
+	if (list_entry_is_head(attachment, &linedisp_attachments, list))
+		return NULL;
+
+	linedisp = attachment->linedisp;
+	list_del(&attachment->list);
+	kfree(attachment);
+
+	return linedisp;
+}
+
+static struct linedisp *to_linedisp(struct device *dev)
+{
+	struct linedisp_attachment *attachment;
+
+	guard(spinlock)(&linedisp_attachments_lock);
+
+	list_for_each_entry(attachment, &linedisp_attachments, list) {
+		if (attachment->device == dev)
+			break;
+	}
+
+	if (list_entry_is_head(attachment, &linedisp_attachments, list))
+		return NULL;
+
+	return attachment->linedisp;
+}
+
+static inline bool should_scroll(struct linedisp *linedisp)
+{
+	return linedisp->message_len > linedisp->num_chars && linedisp->scroll_rate;
+}
+
+/**
+ * linedisp_scroll() - scroll the display by a character
+ * @t: really a pointer to the private data structure
+ *
+ * Scroll the current message along the display by one character, rearming the
+ * timer if required.
+ */
+static void linedisp_scroll(struct timer_list *t)
+{
+	struct linedisp *linedisp = timer_container_of(linedisp, t, timer);
+	unsigned int i, ch = linedisp->scroll_pos;
+	unsigned int num_chars = linedisp->num_chars;
+
+	/* update the current message string */
+	for (i = 0; i < num_chars;) {
+		/* copy as many characters from the string as possible */
+		for (; i < num_chars && ch < linedisp->message_len; i++, ch++)
+			linedisp->buf[i] = linedisp->message[ch];
+
+		/* wrap around to the start of the string */
+		ch = 0;
+	}
+
+	/* update the display */
+	linedisp->ops->update(linedisp);
+
+	/* move on to the next character */
+	linedisp->scroll_pos++;
+	linedisp->scroll_pos %= linedisp->message_len;
+
+	/* rearm the timer */
+	mod_timer(&linedisp->timer, jiffies + linedisp->scroll_rate);
+}
+
+/**
+ * linedisp_display() - set the message to be displayed
+ * @linedisp: pointer to the private data structure
+ * @msg: the message to display
+ * @count: length of msg, or -1
+ *
+ * Display a new message @msg on the display. @msg can be longer than the
+ * number of characters the display can display, in which case it will begin
+ * scrolling across the display.
+ *
+ * Return: 0 on success, -ENOMEM on memory allocation failure
+ */
+static int linedisp_display(struct linedisp *linedisp, const char *msg,
+			    ssize_t count)
+{
+	char *new_msg;
+
+	/* stop the scroll timer */
+	timer_delete_sync(&linedisp->timer);
+
+	if (count == -1)
+		count = strlen(msg);
+
+	/* if the string ends with a newline, trim it */
+	if (count && msg[count - 1] == '\n')
+		count--;
+
+	if (!count) {
+		/* Clear the display */
+		kfree(linedisp->message);
+		linedisp->message = NULL;
+		linedisp->message_len = 0;
+		memset(linedisp->buf, ' ', linedisp->num_chars);
+		linedisp->ops->update(linedisp);
+		return 0;
+	}
+
+	new_msg = kmemdup_nul(msg, count, GFP_KERNEL);
+	if (!new_msg)
+		return -ENOMEM;
+
+	kfree(linedisp->message);
+
+	linedisp->message = new_msg;
+	linedisp->message_len = count;
+	linedisp->scroll_pos = 0;
+
+	if (should_scroll(linedisp)) {
+		/* display scrolling message */
+		linedisp_scroll(&linedisp->timer);
+	} else {
+		/* display static message */
+		memset(linedisp->buf, ' ', linedisp->num_chars);
+		memcpy(linedisp->buf, linedisp->message,
+		       umin(linedisp->num_chars, linedisp->message_len));
+		linedisp->ops->update(linedisp);
+	}
+
+	return 0;
+}
+
+/**
+ * message_show() - read message via sysfs
+ * @dev: the display device
+ * @attr: the display message attribute
+ * @buf: the buffer to read the message into
+ *
+ * Read the current message being displayed or scrolled across the display into
+ * @buf, for reads from sysfs.
+ *
+ * Return: the number of characters written to @buf
+ */
+static ssize_t message_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+
+	return sysfs_emit(buf, "%s\n", linedisp->message);
+}
+
+/**
+ * message_store() - write a new message via sysfs
+ * @dev: the display device
+ * @attr: the display message attribute
+ * @buf: the buffer containing the new message
+ * @count: the size of the message in @buf
+ *
+ * Write a new message to display or scroll across the display from sysfs.
+ *
+ * Return: the size of the message on success, else -ERRNO
+ */
+static ssize_t message_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+	int err;
+
+	err = linedisp_display(linedisp, buf, count);
+	return err ?: count;
+}
+
+static DEVICE_ATTR_RW(message);
+
+static ssize_t num_chars_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+
+	return sysfs_emit(buf, "%u\n", linedisp->num_chars);
+}
+
+static DEVICE_ATTR_RO(num_chars);
+
+static ssize_t scroll_step_ms_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+
+	return sysfs_emit(buf, "%u\n", jiffies_to_msecs(linedisp->scroll_rate));
+}
+
+static ssize_t scroll_step_ms_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+	unsigned int ms;
+	int err;
+
+	err = kstrtouint(buf, 10, &ms);
+	if (err)
+		return err;
+
+	timer_delete_sync(&linedisp->timer);
+
+	linedisp->scroll_rate = msecs_to_jiffies(ms);
+
+	if (should_scroll(linedisp))
+		linedisp_scroll(&linedisp->timer);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(scroll_step_ms);
+
+static ssize_t map_seg_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+	struct linedisp_map *map = linedisp->map;
+
+	memcpy(buf, &map->map, map->size);
+	return map->size;
+}
+
+static ssize_t map_seg_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	struct linedisp *linedisp = to_linedisp(dev);
+	struct linedisp_map *map = linedisp->map;
+
+	if (count != map->size)
+		return -EINVAL;
+
+	memcpy(&map->map, buf, count);
+	return count;
+}
+
+static const SEG7_DEFAULT_MAP(initial_map_seg7);
+static DEVICE_ATTR(map_seg7, 0644, map_seg_show, map_seg_store);
+
+static const SEG14_DEFAULT_MAP(initial_map_seg14);
+static DEVICE_ATTR(map_seg14, 0644, map_seg_show, map_seg_store);
+
+static struct attribute *linedisp_attrs[] = {
+	&dev_attr_message.attr,
+	&dev_attr_num_chars.attr,
+	&dev_attr_scroll_step_ms.attr,
+	&dev_attr_map_seg7.attr,
+	&dev_attr_map_seg14.attr,
+	NULL
+};
+
+static umode_t linedisp_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct linedisp *linedisp = to_linedisp(dev);
+	struct linedisp_map *map = linedisp->map;
+	umode_t mode = attr->mode;
+
+	if (attr == &dev_attr_map_seg7.attr) {
+		if (!map)
+			return 0;
+		if (map->type != LINEDISP_MAP_SEG7)
+			return 0;
+	}
+
+	if (attr == &dev_attr_map_seg14.attr) {
+		if (!map)
+			return 0;
+		if (map->type != LINEDISP_MAP_SEG14)
+			return 0;
+	}
+
+	return mode;
+};
+
+static const struct attribute_group linedisp_group = {
+	.is_visible	= linedisp_attr_is_visible,
+	.attrs		= linedisp_attrs,
+};
+__ATTRIBUTE_GROUPS(linedisp);
+
+static DEFINE_IDA(linedisp_id);
+
+static void linedisp_release(struct device *dev)
+{
+	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
+
+	kfree(linedisp->map);
+	kfree(linedisp->message);
+	kfree(linedisp->buf);
+	ida_free(&linedisp_id, linedisp->id);
+}
+
+static const struct device_type linedisp_type = {
+	.groups	= linedisp_groups,
+	.release = linedisp_release,
+};
+
+static int linedisp_init_map(struct linedisp *linedisp)
+{
+	struct linedisp_map *map;
+	int err;
+
+	if (!linedisp->ops->get_map_type)
+		return 0;
+
+	err = linedisp->ops->get_map_type(linedisp);
+	if (err < 0)
+		return err;
+
+	map = kmalloc_obj(*map);
+	if (!map)
+		return -ENOMEM;
+
+	map->type = err;
+
+	/* assign initial mapping */
+	switch (map->type) {
+	case LINEDISP_MAP_SEG7:
+		map->map.seg7 = initial_map_seg7;
+		map->size = sizeof(map->map.seg7);
+		break;
+	case LINEDISP_MAP_SEG14:
+		map->map.seg14 = initial_map_seg14;
+		map->size = sizeof(map->map.seg14);
+		break;
+	default:
+		kfree(map);
+		return -EINVAL;
+	}
+
+	linedisp->map = map;
+
+	return 0;
+}
+
+#ifdef CONFIG_PANEL_BOOT_MESSAGE
+#define LINEDISP_INIT_TEXT CONFIG_PANEL_BOOT_MESSAGE
+#else
+#define LINEDISP_INIT_TEXT "Linux " UTS_RELEASE "       "
+#endif
+
+/**
+ * linedisp_attach - attach a character line display
+ * @linedisp: pointer to character line display structure
+ * @dev: pointer of the device to attach to
+ * @num_chars: the number of characters that can be displayed
+ * @ops: character line display operations
+ *
+ * Directly attach the line-display sysfs attributes to the passed device.
+ * The caller is responsible for calling linedisp_detach() to release resources
+ * after use.
+ *
+ * Return: zero on success, else a negative error code.
+ */
+int linedisp_attach(struct linedisp *linedisp, struct device *dev,
+		    unsigned int num_chars, const struct linedisp_ops *ops)
+{
+	int err;
+
+	memset(linedisp, 0, sizeof(*linedisp));
+	linedisp->ops = ops;
+	linedisp->num_chars = num_chars;
+	linedisp->scroll_rate = DEFAULT_SCROLL_RATE;
+
+	linedisp->buf = kzalloc(linedisp->num_chars, GFP_KERNEL);
+	if (!linedisp->buf)
+		return -ENOMEM;
+
+	/* initialise a character mapping, if required */
+	err = linedisp_init_map(linedisp);
+	if (err)
+		goto out_free_buf;
+
+	/* initialise a timer for scrolling the message */
+	timer_setup(&linedisp->timer, linedisp_scroll, 0);
+
+	err = create_attachment(dev, linedisp, true);
+	if (err)
+		goto out_del_timer;
+
+	/* display a default message */
+	err = linedisp_display(linedisp, LINEDISP_INIT_TEXT, -1);
+	if (err)
+		goto out_del_attach;
+
+	/* add attribute groups to target device */
+	err = device_add_groups(dev, linedisp_groups);
+	if (err)
+		goto out_del_attach;
+
+	return 0;
+
+out_del_attach:
+	delete_attachment(dev, true);
+out_del_timer:
+	timer_delete_sync(&linedisp->timer);
+out_free_buf:
+	kfree(linedisp->buf);
+	return err;
+}
+EXPORT_SYMBOL_NS_GPL(linedisp_attach, "LINEDISP");
+
+/**
+ * linedisp_detach - detach a character line display
+ * @dev: pointer of the device to detach from, that was previously
+ *	 attached with linedisp_attach()
+ */
+void linedisp_detach(struct device *dev)
+{
+	struct linedisp *linedisp;
+
+	linedisp = delete_attachment(dev, true);
+	if (!linedisp)
+		return;
+
+	timer_delete_sync(&linedisp->timer);
+
+	device_remove_groups(dev, linedisp_groups);
+
+	kfree(linedisp->map);
+	kfree(linedisp->message);
+	kfree(linedisp->buf);
+}
+EXPORT_SYMBOL_NS_GPL(linedisp_detach, "LINEDISP");
+
+/**
+ * linedisp_register - register a character line display
+ * @linedisp: pointer to character line display structure
+ * @parent: parent device
+ * @num_chars: the number of characters that can be displayed
+ * @ops: character line display operations
+ *
+ * Register the line-display sysfs attributes to a new device named
+ * "linedisp.N" added to the passed parent device.
+ * The caller is responsible for calling linedisp_unregister() to release
+ * resources after use.
+ *
+ * Return: zero on success, else a negative error code.
+ */
+int linedisp_register(struct linedisp *linedisp, struct device *parent,
+		      unsigned int num_chars, const struct linedisp_ops *ops)
+{
+	int err;
+
+	memset(linedisp, 0, sizeof(*linedisp));
+	linedisp->dev.parent = parent;
+	linedisp->dev.type = &linedisp_type;
+	linedisp->ops = ops;
+	linedisp->num_chars = num_chars;
+	linedisp->scroll_rate = DEFAULT_SCROLL_RATE;
+
+	err = ida_alloc(&linedisp_id, GFP_KERNEL);
+	if (err < 0)
+		return err;
+	linedisp->id = err;
+
+	device_initialize(&linedisp->dev);
+	dev_set_name(&linedisp->dev, "linedisp.%u", linedisp->id);
+
+	err = -ENOMEM;
+	linedisp->buf = kzalloc(linedisp->num_chars, GFP_KERNEL);
+	if (!linedisp->buf)
+		goto out_put_device;
+
+	/* initialise a character mapping, if required */
+	err = linedisp_init_map(linedisp);
+	if (err)
+		goto out_put_device;
+
+	/* initialise a timer for scrolling the message */
+	timer_setup(&linedisp->timer, linedisp_scroll, 0);
+
+	err = create_attachment(&linedisp->dev, linedisp, false);
+	if (err)
+		goto out_del_timer;
+
+	/* display a default message */
+	err = linedisp_display(linedisp, LINEDISP_INIT_TEXT, -1);
+	if (err)
+		goto out_del_attach;
+
+	err = device_add(&linedisp->dev);
+	if (err)
+		goto out_del_attach;
+
+	return 0;
+
+out_del_attach:
+	delete_attachment(&linedisp->dev, false);
+out_del_timer:
+	timer_delete_sync(&linedisp->timer);
+out_put_device:
+	put_device(&linedisp->dev);
+	return err;
+}
+EXPORT_SYMBOL_NS_GPL(linedisp_register, "LINEDISP");
+
+/**
+ * linedisp_unregister - unregister a character line display
+ * @linedisp: pointer to character line display structure registered previously
+ *	      with linedisp_register()
+ */
+void linedisp_unregister(struct linedisp *linedisp)
+{
+	device_del(&linedisp->dev);
+	delete_attachment(&linedisp->dev, false);
+	timer_delete_sync(&linedisp->timer);
+	put_device(&linedisp->dev);
+}
+EXPORT_SYMBOL_NS_GPL(linedisp_unregister, "LINEDISP");
+
+MODULE_DESCRIPTION("Character line display core support");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/line-display.h b/drivers/auxdisplay/line-display.h
new file mode 100644
index 000000000..36853b639
--- /dev/null
+++ b/drivers/auxdisplay/line-display.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Character line display core support
+ *
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ *
+ * Copyright (C) 2021 Glider bv
+ * Copyright (C) 2025 Jean-François Lessard
+ */
+
+#ifndef _LINEDISP_H
+#define _LINEDISP_H
+
+#include <linux/device.h>
+#include <linux/timer_types.h>
+
+#include <linux/map_to_7segment.h>
+#include <linux/map_to_14segment.h>
+
+struct linedisp;
+
+/**
+ * enum linedisp_map_type - type of the character mapping
+ * @LINEDISP_MAP_SEG7: Map characters to 7 segment display
+ * @LINEDISP_MAP_SEG14: Map characters to 14 segment display
+ */
+enum linedisp_map_type {
+	LINEDISP_MAP_SEG7,
+	LINEDISP_MAP_SEG14,
+};
+
+/**
+ * struct linedisp_map - character mapping
+ * @type: type of the character mapping
+ * @map: conversion character mapping
+ * @size: size of the @map
+ */
+struct linedisp_map {
+	enum linedisp_map_type type;
+	union {
+		struct seg7_conversion_map seg7;
+		struct seg14_conversion_map seg14;
+	} map;
+	unsigned int size;
+};
+
+/**
+ * struct linedisp_ops - character line display operations
+ * @get_map_type: Function called to get the character mapping, if required
+ * @update: Function called to update the display. This must not sleep!
+ */
+struct linedisp_ops {
+	int (*get_map_type)(struct linedisp *linedisp);
+	void (*update)(struct linedisp *linedisp);
+};
+
+/**
+ * struct linedisp - character line display private data structure
+ * @dev: the line display device
+ * @timer: timer used to implement scrolling
+ * @ops: character line display operations
+ * @buf: pointer to the buffer for the string currently displayed
+ * @message: the full message to display or scroll on the display
+ * @num_chars: the number of characters that can be displayed
+ * @message_len: the length of the @message string
+ * @scroll_pos: index of the first character of @message currently displayed
+ * @scroll_rate: scroll interval in jiffies
+ * @id: instance id of this display
+ */
+struct linedisp {
+	struct device dev;
+	struct timer_list timer;
+	const struct linedisp_ops *ops;
+	struct linedisp_map *map;
+	char *buf;
+	char *message;
+	unsigned int num_chars;
+	unsigned int message_len;
+	unsigned int scroll_pos;
+	unsigned int scroll_rate;
+	unsigned int id;
+};
+
+int linedisp_attach(struct linedisp *linedisp, struct device *dev,
+		    unsigned int num_chars, const struct linedisp_ops *ops);
+void linedisp_detach(struct device *dev);
+int linedisp_register(struct linedisp *linedisp, struct device *parent,
+		      unsigned int num_chars, const struct linedisp_ops *ops);
+void linedisp_unregister(struct linedisp *linedisp);
+
+#endif /* LINEDISP_H */
diff --git a/drivers/auxdisplay/max6959.c b/drivers/auxdisplay/max6959.c
new file mode 100644
index 000000000..888788a1f
--- /dev/null
+++ b/drivers/auxdisplay/max6959.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MAX6958/6959 7-segment LED display controller
+ * Datasheet:
+ * https://www.analog.com/media/en/technical-documentation/data-sheets/MAX6958-MAX6959.pdf
+ *
+ * Copyright (c) 2024, Intel Corporation.
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ */
+#include <linux/array_size.h>
+#include <linux/bitrev.h>
+#include <linux/bits.h>
+#include <linux/container_of.h>
+#include <linux/device/devres.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <linux/map_to_7segment.h>
+
+#include "line-display.h"
+
+/* Registers */
+#define REG_DECODE_MODE			0x01
+#define REG_INTENSITY			0x02
+#define REG_SCAN_LIMIT			0x03
+#define REG_CONFIGURATION		0x04
+#define REG_CONFIGURATION_S_BIT		BIT(0)
+
+#define REG_DIGIT(x)			(0x20 + (x))
+#define REG_DIGIT0			0x20
+#define REG_DIGIT1			0x21
+#define REG_DIGIT2			0x22
+#define REG_DIGIT3			0x23
+
+#define REG_SEGMENTS			0x24
+#define REG_MAX				REG_SEGMENTS
+
+struct max6959_priv {
+	struct linedisp linedisp;
+	struct delayed_work work;
+	struct regmap *regmap;
+};
+
+static void max6959_disp_update(struct work_struct *work)
+{
+	struct max6959_priv *priv = container_of(work, struct max6959_priv, work.work);
+	struct linedisp *linedisp = &priv->linedisp;
+	struct linedisp_map *map = linedisp->map;
+	char *s = linedisp->buf;
+	u8 buf[4];
+
+	/* Map segments according to datasheet */
+	buf[0] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1;
+	buf[1] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1;
+	buf[2] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1;
+	buf[3] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1;
+
+	regmap_bulk_write(priv->regmap, REG_DIGIT(0), buf, ARRAY_SIZE(buf));
+}
+
+static int max6959_linedisp_get_map_type(struct linedisp *linedisp)
+{
+	struct max6959_priv *priv = container_of(linedisp, struct max6959_priv, linedisp);
+
+	INIT_DELAYED_WORK(&priv->work, max6959_disp_update);
+	return LINEDISP_MAP_SEG7;
+}
+
+static void max6959_linedisp_update(struct linedisp *linedisp)
+{
+	struct max6959_priv *priv = container_of(linedisp, struct max6959_priv, linedisp);
+
+	schedule_delayed_work(&priv->work, 0);
+}
+
+static const struct linedisp_ops max6959_linedisp_ops = {
+	.get_map_type = max6959_linedisp_get_map_type,
+	.update = max6959_linedisp_update,
+};
+
+static int max6959_enable(struct max6959_priv *priv, bool enable)
+{
+	return regmap_assign_bits(priv->regmap, REG_CONFIGURATION, REG_CONFIGURATION_S_BIT, enable);
+}
+
+static void max6959_power_off(void *priv)
+{
+	max6959_enable(priv, false);
+}
+
+static int max6959_power_on(struct max6959_priv *priv)
+{
+	struct device *dev = regmap_get_device(priv->regmap);
+	int ret;
+
+	ret = max6959_enable(priv, true);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, max6959_power_off, priv);
+}
+
+static const struct regmap_config max6959_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = REG_MAX,
+	.cache_type = REGCACHE_MAPLE,
+};
+
+static int max6959_i2c_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct max6959_priv *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->regmap = devm_regmap_init_i2c(client, &max6959_regmap_config);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	ret = max6959_power_on(priv);
+	if (ret)
+		return ret;
+
+	ret = linedisp_register(&priv->linedisp, dev, 4, &max6959_linedisp_ops);
+	if (ret)
+		return ret;
+
+	i2c_set_clientdata(client, priv);
+
+	return 0;
+}
+
+static void max6959_i2c_remove(struct i2c_client *client)
+{
+	struct max6959_priv *priv = i2c_get_clientdata(client);
+
+	cancel_delayed_work_sync(&priv->work);
+	linedisp_unregister(&priv->linedisp);
+}
+
+static int max6959_suspend(struct device *dev)
+{
+	return max6959_enable(dev_get_drvdata(dev), false);
+}
+
+static int max6959_resume(struct device *dev)
+{
+	return max6959_enable(dev_get_drvdata(dev), true);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(max6959_pm_ops, max6959_suspend, max6959_resume);
+
+static const struct i2c_device_id max6959_i2c_id[] = {
+	{ "max6959" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max6959_i2c_id);
+
+static const struct of_device_id max6959_of_table[] = {
+	{ .compatible = "maxim,max6959" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max6959_of_table);
+
+static struct i2c_driver max6959_i2c_driver = {
+	.driver = {
+		.name = "max6959",
+		.pm = pm_sleep_ptr(&max6959_pm_ops),
+		.of_match_table = max6959_of_table,
+	},
+	.probe = max6959_i2c_probe,
+	.remove = max6959_i2c_remove,
+	.id_table = max6959_i2c_id,
+};
+module_i2c_driver(max6959_i2c_driver);
+
+MODULE_DESCRIPTION("MAX6958/6959 7-segment LED controller");
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("LINEDISP");
diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
new file mode 100644
index 000000000..a7dfc5315
--- /dev/null
+++ b/drivers/auxdisplay/panel.c
@@ -0,0 +1,1669 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Front panel driver for Linux
+ * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
+ * Copyright (C) 2016-2017 Glider bvba
+ *
+ * This code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
+ * connected to a parallel printer port.
+ *
+ * The LCD module may either be an HD44780-like 8-bit parallel LCD, or a 1-bit
+ * serial module compatible with Samsung's KS0074. The pins may be connected in
+ * any combination, everything is programmable.
+ *
+ * The keypad consists in a matrix of push buttons connecting input pins to
+ * data output pins or to the ground. The combinations have to be hard-coded
+ * in the driver, though several profiles exist and adding new ones is easy.
+ *
+ * Several profiles are provided for commonly found LCD+keypad modules on the
+ * market, such as those found in Nexcom's appliances.
+ *
+ * FIXME:
+ *      - the initialization/deinitialization process is very dirty and should
+ *        be rewritten. It may even be buggy.
+ *
+ * TODO:
+ *	- document 24 keys keyboard (3 rows of 8 cols, 32 diodes + 2 inputs)
+ *      - make the LCD a part of a virtual screen of Vx*Vy
+ *	- make the inputs list smp-safe
+ *      - change the keyboard to a double mapping : signals -> key_id -> values
+ *        so that applications can change values without knowing signals
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/parport.h>
+#include <linux/list.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include "charlcd.h"
+#include "hd44780_common.h"
+
+#define LCD_MAXBYTES		256	/* max burst write */
+
+#define KEYPAD_BUFFER		64
+
+/* poll the keyboard this every second */
+#define INPUT_POLL_TIME		(HZ / 50)
+/* a key starts to repeat after this times INPUT_POLL_TIME */
+#define KEYPAD_REP_START	(10)
+/* a key repeats this times INPUT_POLL_TIME */
+#define KEYPAD_REP_DELAY	(2)
+
+/* converts an r_str() input to an active high, bits string : 000BAOSE */
+#define PNL_PINPUT(a)		((((unsigned char)(a)) ^ 0x7F) >> 3)
+
+#define PNL_PBUSY		0x80	/* inverted input, active low */
+#define PNL_PACK		0x40	/* direct input, active low */
+#define PNL_POUTPA		0x20	/* direct input, active high */
+#define PNL_PSELECD		0x10	/* direct input, active high */
+#define PNL_PERRORP		0x08	/* direct input, active low */
+
+#define PNL_PBIDIR		0x20	/* bi-directional ports */
+/* high to read data in or-ed with data out */
+#define PNL_PINTEN		0x10
+#define PNL_PSELECP		0x08	/* inverted output, active low */
+#define PNL_PINITP		0x04	/* direct output, active low */
+#define PNL_PAUTOLF		0x02	/* inverted output, active low */
+#define PNL_PSTROBE		0x01	/* inverted output */
+
+#define PNL_PD0			0x01
+#define PNL_PD1			0x02
+#define PNL_PD2			0x04
+#define PNL_PD3			0x08
+#define PNL_PD4			0x10
+#define PNL_PD5			0x20
+#define PNL_PD6			0x40
+#define PNL_PD7			0x80
+
+#define PIN_NONE		0
+#define PIN_STROBE		1
+#define PIN_D0			2
+#define PIN_D1			3
+#define PIN_D2			4
+#define PIN_D3			5
+#define PIN_D4			6
+#define PIN_D5			7
+#define PIN_D6			8
+#define PIN_D7			9
+#define PIN_AUTOLF		14
+#define PIN_INITP		16
+#define PIN_SELECP		17
+#define PIN_NOT_SET		127
+
+#define NOT_SET			-1
+
+/* macros to simplify use of the parallel port */
+#define r_ctr(x)        (parport_read_control((x)->port))
+#define r_dtr(x)        (parport_read_data((x)->port))
+#define r_str(x)        (parport_read_status((x)->port))
+#define w_ctr(x, y)     (parport_write_control((x)->port, (y)))
+#define w_dtr(x, y)     (parport_write_data((x)->port, (y)))
+
+/* this defines which bits are to be used and which ones to be ignored */
+/* logical or of the output bits involved in the scan matrix */
+static __u8 scan_mask_o;
+/* logical or of the input bits involved in the scan matrix */
+static __u8 scan_mask_i;
+
+enum input_type {
+	INPUT_TYPE_STD,
+	INPUT_TYPE_KBD,
+};
+
+enum input_state {
+	INPUT_ST_LOW,
+	INPUT_ST_RISING,
+	INPUT_ST_HIGH,
+	INPUT_ST_FALLING,
+};
+
+struct logical_input {
+	struct list_head list;
+	__u64 mask;
+	__u64 value;
+	enum input_type type;
+	enum input_state state;
+	__u8 rise_time, fall_time;
+	__u8 rise_timer, fall_timer, high_timer;
+
+	union {
+		struct {	/* valid when type == INPUT_TYPE_STD */
+			void (*press_fct)(int);
+			void (*release_fct)(int);
+			int press_data;
+			int release_data;
+		} std;
+		struct {	/* valid when type == INPUT_TYPE_KBD */
+			char press_str[sizeof(void *) + sizeof(int)] __nonstring;
+			char repeat_str[sizeof(void *) + sizeof(int)] __nonstring;
+			char release_str[sizeof(void *) + sizeof(int)] __nonstring;
+		} kbd;
+	} u;
+};
+
+static LIST_HEAD(logical_inputs);	/* list of all defined logical inputs */
+
+/* physical contacts history
+ * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
+ * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
+ * corresponds to the ground.
+ * Within each group, bits are stored in the same order as read on the port :
+ * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
+ * So, each __u64 is represented like this :
+ * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
+ * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
+ */
+
+/* what has just been read from the I/O ports */
+static __u64 phys_read;
+/* previous phys_read */
+static __u64 phys_read_prev;
+/* stabilized phys_read (phys_read|phys_read_prev) */
+static __u64 phys_curr;
+/* previous phys_curr */
+static __u64 phys_prev;
+/* 0 means that at least one logical signal needs be computed */
+static char inputs_stable;
+
+/* these variables are specific to the keypad */
+static struct {
+	bool enabled;
+} keypad;
+
+static char keypad_buffer[KEYPAD_BUFFER];
+static int keypad_buflen;
+static int keypad_start;
+static char keypressed;
+static wait_queue_head_t keypad_read_wait;
+
+/* lcd-specific variables */
+static struct {
+	bool enabled;
+	bool initialized;
+
+	int charset;
+	int proto;
+
+	/* TODO: use union here? */
+	struct {
+		int e;
+		int rs;
+		int rw;
+		int cl;
+		int da;
+		int bl;
+	} pins;
+
+	struct charlcd *charlcd;
+} lcd;
+
+/* Needed only for init */
+static int selected_lcd_type = NOT_SET;
+
+/*
+ * Bit masks to convert LCD signals to parallel port outputs.
+ * _d_ are values for data port, _c_ are for control port.
+ * [0] = signal OFF, [1] = signal ON, [2] = mask
+ */
+#define BIT_CLR		0
+#define BIT_SET		1
+#define BIT_MSK		2
+#define BIT_STATES	3
+/*
+ * one entry for each bit on the LCD
+ */
+#define LCD_BIT_E	0
+#define LCD_BIT_RS	1
+#define LCD_BIT_RW	2
+#define LCD_BIT_BL	3
+#define LCD_BIT_CL	4
+#define LCD_BIT_DA	5
+#define LCD_BITS	6
+
+/*
+ * each bit can be either connected to a DATA or CTRL port
+ */
+#define LCD_PORT_C	0
+#define LCD_PORT_D	1
+#define LCD_PORTS	2
+
+static unsigned char lcd_bits[LCD_PORTS][LCD_BITS][BIT_STATES];
+
+/*
+ * LCD protocols
+ */
+#define LCD_PROTO_PARALLEL      0
+#define LCD_PROTO_SERIAL        1
+#define LCD_PROTO_TI_DA8XX_LCD	2
+
+/*
+ * LCD character sets
+ */
+#define LCD_CHARSET_NORMAL      0
+#define LCD_CHARSET_KS0074      1
+
+/*
+ * LCD types
+ */
+#define LCD_TYPE_NONE		0
+#define LCD_TYPE_CUSTOM		1
+#define LCD_TYPE_OLD		2
+#define LCD_TYPE_KS0074		3
+#define LCD_TYPE_HANTRONIX	4
+#define LCD_TYPE_NEXCOM		5
+
+/*
+ * keypad types
+ */
+#define KEYPAD_TYPE_NONE	0
+#define KEYPAD_TYPE_OLD		1
+#define KEYPAD_TYPE_NEW		2
+#define KEYPAD_TYPE_NEXCOM	3
+
+/*
+ * panel profiles
+ */
+#define PANEL_PROFILE_CUSTOM	0
+#define PANEL_PROFILE_OLD	1
+#define PANEL_PROFILE_NEW	2
+#define PANEL_PROFILE_HANTRONIX	3
+#define PANEL_PROFILE_NEXCOM	4
+#define PANEL_PROFILE_LARGE	5
+
+/*
+ * Construct custom config from the kernel's configuration
+ */
+#define DEFAULT_PARPORT         0
+#define DEFAULT_PROFILE         PANEL_PROFILE_LARGE
+#define DEFAULT_KEYPAD_TYPE     KEYPAD_TYPE_OLD
+#define DEFAULT_LCD_TYPE        LCD_TYPE_OLD
+#define DEFAULT_LCD_HEIGHT      2
+#define DEFAULT_LCD_WIDTH       40
+#define DEFAULT_LCD_CHARSET     LCD_CHARSET_NORMAL
+#define DEFAULT_LCD_PROTO       LCD_PROTO_PARALLEL
+
+#define DEFAULT_LCD_PIN_E       PIN_AUTOLF
+#define DEFAULT_LCD_PIN_RS      PIN_SELECP
+#define DEFAULT_LCD_PIN_RW      PIN_INITP
+#define DEFAULT_LCD_PIN_SCL     PIN_STROBE
+#define DEFAULT_LCD_PIN_SDA     PIN_D0
+#define DEFAULT_LCD_PIN_BL      PIN_NOT_SET
+
+#ifdef CONFIG_PANEL_PARPORT
+#undef DEFAULT_PARPORT
+#define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
+#endif
+
+#ifdef CONFIG_PANEL_PROFILE
+#undef DEFAULT_PROFILE
+#define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
+#endif
+
+#if DEFAULT_PROFILE == 0	/* custom */
+#ifdef CONFIG_PANEL_KEYPAD
+#undef DEFAULT_KEYPAD_TYPE
+#define DEFAULT_KEYPAD_TYPE CONFIG_PANEL_KEYPAD
+#endif
+
+#ifdef CONFIG_PANEL_LCD
+#undef DEFAULT_LCD_TYPE
+#define DEFAULT_LCD_TYPE CONFIG_PANEL_LCD
+#endif
+
+#ifdef CONFIG_PANEL_LCD_HEIGHT
+#undef DEFAULT_LCD_HEIGHT
+#define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
+#endif
+
+#ifdef CONFIG_PANEL_LCD_WIDTH
+#undef DEFAULT_LCD_WIDTH
+#define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_BWIDTH
+#undef DEFAULT_LCD_BWIDTH
+#define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_HWIDTH
+#undef DEFAULT_LCD_HWIDTH
+#define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
+#endif
+
+#ifdef CONFIG_PANEL_LCD_CHARSET
+#undef DEFAULT_LCD_CHARSET
+#define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PROTO
+#undef DEFAULT_LCD_PROTO
+#define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_E
+#undef DEFAULT_LCD_PIN_E
+#define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_RS
+#undef DEFAULT_LCD_PIN_RS
+#define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_RW
+#undef DEFAULT_LCD_PIN_RW
+#define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_SCL
+#undef DEFAULT_LCD_PIN_SCL
+#define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_SDA
+#undef DEFAULT_LCD_PIN_SDA
+#define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
+#endif
+
+#ifdef CONFIG_PANEL_LCD_PIN_BL
+#undef DEFAULT_LCD_PIN_BL
+#define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
+#endif
+
+#endif /* DEFAULT_PROFILE == 0 */
+
+/* global variables */
+
+/* Device single-open policy control */
+static atomic_t keypad_available = ATOMIC_INIT(1);
+
+static struct pardevice *pprt;
+
+static int keypad_initialized;
+
+static DEFINE_SPINLOCK(pprt_lock);
+static struct timer_list scan_timer;
+
+MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");
+
+static int parport = DEFAULT_PARPORT;
+module_param(parport, int, 0000);
+MODULE_PARM_DESC(parport, "Parallel port index (0=lpt1, 1=lpt2, ...)");
+
+static int profile = DEFAULT_PROFILE;
+module_param(profile, int, 0000);
+MODULE_PARM_DESC(profile,
+		 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
+		 "4=16x2 nexcom; default=40x2, old kp");
+
+static int keypad_type = NOT_SET;
+module_param(keypad_type, int, 0000);
+MODULE_PARM_DESC(keypad_type,
+		 "Keypad type: 0=none, 1=old 6 keys, 2=new 6+1 keys, 3=nexcom 4 keys");
+
+static int lcd_type = NOT_SET;
+module_param(lcd_type, int, 0000);
+MODULE_PARM_DESC(lcd_type,
+		 "LCD type: 0=none, 1=compiled-in, 2=old, 3=serial ks0074, 4=hantronix, 5=nexcom");
+
+static int lcd_height = NOT_SET;
+module_param(lcd_height, int, 0000);
+MODULE_PARM_DESC(lcd_height, "Number of lines on the LCD");
+
+static int lcd_width = NOT_SET;
+module_param(lcd_width, int, 0000);
+MODULE_PARM_DESC(lcd_width, "Number of columns on the LCD");
+
+static int lcd_bwidth = NOT_SET;	/* internal buffer width (usually 40) */
+module_param(lcd_bwidth, int, 0000);
+MODULE_PARM_DESC(lcd_bwidth, "Internal LCD line width (40)");
+
+static int lcd_hwidth = NOT_SET;	/* hardware buffer width (usually 64) */
+module_param(lcd_hwidth, int, 0000);
+MODULE_PARM_DESC(lcd_hwidth, "LCD line hardware address (64)");
+
+static int lcd_charset = NOT_SET;
+module_param(lcd_charset, int, 0000);
+MODULE_PARM_DESC(lcd_charset, "LCD character set: 0=standard, 1=KS0074");
+
+static int lcd_proto = NOT_SET;
+module_param(lcd_proto, int, 0000);
+MODULE_PARM_DESC(lcd_proto,
+		 "LCD communication: 0=parallel (//), 1=serial, 2=TI LCD Interface");
+
+/*
+ * These are the parallel port pins the LCD control signals are connected to.
+ * Set this to 0 if the signal is not used. Set it to its opposite value
+ * (negative) if the signal is negated. -MAXINT is used to indicate that the
+ * pin has not been explicitly specified.
+ *
+ * WARNING! no check will be performed about collisions with keypad !
+ */
+
+static int lcd_e_pin  = PIN_NOT_SET;
+module_param(lcd_e_pin, int, 0000);
+MODULE_PARM_DESC(lcd_e_pin,
+		 "# of the // port pin connected to LCD 'E' signal, with polarity (-17..17)");
+
+static int lcd_rs_pin = PIN_NOT_SET;
+module_param(lcd_rs_pin, int, 0000);
+MODULE_PARM_DESC(lcd_rs_pin,
+		 "# of the // port pin connected to LCD 'RS' signal, with polarity (-17..17)");
+
+static int lcd_rw_pin = PIN_NOT_SET;
+module_param(lcd_rw_pin, int, 0000);
+MODULE_PARM_DESC(lcd_rw_pin,
+		 "# of the // port pin connected to LCD 'RW' signal, with polarity (-17..17)");
+
+static int lcd_cl_pin = PIN_NOT_SET;
+module_param(lcd_cl_pin, int, 0000);
+MODULE_PARM_DESC(lcd_cl_pin,
+		 "# of the // port pin connected to serial LCD 'SCL' signal, with polarity (-17..17)");
+
+static int lcd_da_pin = PIN_NOT_SET;
+module_param(lcd_da_pin, int, 0000);
+MODULE_PARM_DESC(lcd_da_pin,
+		 "# of the // port pin connected to serial LCD 'SDA' signal, with polarity (-17..17)");
+
+static int lcd_bl_pin = PIN_NOT_SET;
+module_param(lcd_bl_pin, int, 0000);
+MODULE_PARM_DESC(lcd_bl_pin,
+		 "# of the // port pin connected to LCD backlight, with polarity (-17..17)");
+
+/* Deprecated module parameters - consider not using them anymore */
+
+static int lcd_enabled = NOT_SET;
+module_param(lcd_enabled, int, 0000);
+MODULE_PARM_DESC(lcd_enabled, "Deprecated option, use lcd_type instead");
+
+static int keypad_enabled = NOT_SET;
+module_param(keypad_enabled, int, 0000);
+MODULE_PARM_DESC(keypad_enabled, "Deprecated option, use keypad_type instead");
+
+/* for some LCD drivers (ks0074) we need a charset conversion table. */
+static const unsigned char lcd_char_conv_ks0074[256] = {
+	/*          0|8   1|9   2|A   3|B   4|C   5|D   6|E   7|F */
+	/* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+	/* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+	/* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+	/* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+	/* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
+	/* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+	/* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+	/* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+	/* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+	/* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+	/* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+	/* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
+	/* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+	/* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+	/* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+	/* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
+	/* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+	/* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+	/* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+	/* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+	/* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
+	/* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
+	/* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
+	/* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
+	/* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
+	/* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
+	/* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
+	/* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
+	/* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
+	/* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
+	/* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
+	/* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
+};
+
+static const char old_keypad_profile[][4][9] = {
+	{"S0", "Left\n", "Left\n", ""},
+	{"S1", "Down\n", "Down\n", ""},
+	{"S2", "Up\n", "Up\n", ""},
+	{"S3", "Right\n", "Right\n", ""},
+	{"S4", "Esc\n", "Esc\n", ""},
+	{"S5", "Ret\n", "Ret\n", ""},
+	{"", "", "", ""}
+};
+
+/* signals, press, repeat, release */
+static const char new_keypad_profile[][4][9] = {
+	{"S0", "Left\n", "Left\n", ""},
+	{"S1", "Down\n", "Down\n", ""},
+	{"S2", "Up\n", "Up\n", ""},
+	{"S3", "Right\n", "Right\n", ""},
+	{"S4s5", "", "Esc\n", "Esc\n"},
+	{"s4S5", "", "Ret\n", "Ret\n"},
+	{"S4S5", "Help\n", "", ""},
+	/* add new signals above this line */
+	{"", "", "", ""}
+};
+
+/* signals, press, repeat, release */
+static const char nexcom_keypad_profile[][4][9] = {
+	{"a-p-e-", "Down\n", "Down\n", ""},
+	{"a-p-E-", "Ret\n", "Ret\n", ""},
+	{"a-P-E-", "Esc\n", "Esc\n", ""},
+	{"a-P-e-", "Up\n", "Up\n", ""},
+	/* add new signals above this line */
+	{"", "", "", ""}
+};
+
+static const char (*keypad_profile)[4][9] = old_keypad_profile;
+
+static DECLARE_BITMAP(bits, LCD_BITS);
+
+static void lcd_get_bits(unsigned int port, int *val)
+{
+	unsigned int bit, state;
+
+	for (bit = 0; bit < LCD_BITS; bit++) {
+		state = test_bit(bit, bits) ? BIT_SET : BIT_CLR;
+		*val &= lcd_bits[port][bit][BIT_MSK];
+		*val |= lcd_bits[port][bit][state];
+	}
+}
+
+/* sets data port bits according to current signals values */
+static int set_data_bits(void)
+{
+	int val;
+
+	val = r_dtr(pprt);
+	lcd_get_bits(LCD_PORT_D, &val);
+	w_dtr(pprt, val);
+	return val;
+}
+
+/* sets ctrl port bits according to current signals values */
+static int set_ctrl_bits(void)
+{
+	int val;
+
+	val = r_ctr(pprt);
+	lcd_get_bits(LCD_PORT_C, &val);
+	w_ctr(pprt, val);
+	return val;
+}
+
+/* sets ctrl & data port bits according to current signals values */
+static void panel_set_bits(void)
+{
+	set_data_bits();
+	set_ctrl_bits();
+}
+
+/*
+ * Converts a parallel port pin (from -25 to 25) to data and control ports
+ * masks, and data and control port bits. The signal will be considered
+ * unconnected if it's on pin 0 or an invalid pin (<-25 or >25).
+ *
+ * Result will be used this way :
+ *   out(dport, in(dport) & d_val[2] | d_val[signal_state])
+ *   out(cport, in(cport) & c_val[2] | c_val[signal_state])
+ */
+static void pin_to_bits(int pin, unsigned char *d_val, unsigned char *c_val)
+{
+	int d_bit, c_bit, inv;
+
+	d_val[0] = 0;
+	c_val[0] = 0;
+	d_val[1] = 0;
+	c_val[1] = 0;
+	d_val[2] = 0xFF;
+	c_val[2] = 0xFF;
+
+	if (pin == 0)
+		return;
+
+	inv = (pin < 0);
+	if (inv)
+		pin = -pin;
+
+	d_bit = 0;
+	c_bit = 0;
+
+	switch (pin) {
+	case PIN_STROBE:	/* strobe, inverted */
+		c_bit = PNL_PSTROBE;
+		inv = !inv;
+		break;
+	case PIN_D0...PIN_D7:	/* D0 - D7 = 2 - 9 */
+		d_bit = 1 << (pin - 2);
+		break;
+	case PIN_AUTOLF:	/* autofeed, inverted */
+		c_bit = PNL_PAUTOLF;
+		inv = !inv;
+		break;
+	case PIN_INITP:		/* init, direct */
+		c_bit = PNL_PINITP;
+		break;
+	case PIN_SELECP:	/* select_in, inverted */
+		c_bit = PNL_PSELECP;
+		inv = !inv;
+		break;
+	default:		/* unknown pin, ignore */
+		break;
+	}
+
+	if (c_bit) {
+		c_val[2] &= ~c_bit;
+		c_val[!inv] = c_bit;
+	} else if (d_bit) {
+		d_val[2] &= ~d_bit;
+		d_val[!inv] = d_bit;
+	}
+}
+
+/*
+ * send a serial byte to the LCD panel. The caller is responsible for locking
+ * if needed.
+ */
+static void lcd_send_serial(int byte)
+{
+	int bit;
+
+	/*
+	 * the data bit is set on D0, and the clock on STROBE.
+	 * LCD reads D0 on STROBE's rising edge.
+	 */
+	for (bit = 0; bit < 8; bit++) {
+		clear_bit(LCD_BIT_CL, bits);	/* CLK low */
+		panel_set_bits();
+		if (byte & 1) {
+			set_bit(LCD_BIT_DA, bits);
+		} else {
+			clear_bit(LCD_BIT_DA, bits);
+		}
+
+		panel_set_bits();
+		udelay(2);  /* maintain the data during 2 us before CLK up */
+		set_bit(LCD_BIT_CL, bits);	/* CLK high */
+		panel_set_bits();
+		udelay(1);  /* maintain the strobe during 1 us */
+		byte >>= 1;
+	}
+}
+
+/* turn the backlight on or off */
+static void lcd_backlight(struct charlcd *charlcd, enum charlcd_onoff on)
+{
+	if (lcd.pins.bl == PIN_NONE)
+		return;
+
+	/* The backlight is activated by setting the AUTOFEED line to +5V  */
+	spin_lock_irq(&pprt_lock);
+	if (on)
+		set_bit(LCD_BIT_BL, bits);
+	else
+		clear_bit(LCD_BIT_BL, bits);
+	panel_set_bits();
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the LCD panel in serial mode */
+static void lcd_write_cmd_s(struct hd44780_common *hdc, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	lcd_send_serial(0x1F);	/* R/W=W, RS=0 */
+	lcd_send_serial(cmd & 0x0F);
+	lcd_send_serial((cmd >> 4) & 0x0F);
+	udelay(40);		/* the shortest command takes at least 40 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the LCD panel in serial mode */
+static void lcd_write_data_s(struct hd44780_common *hdc, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	lcd_send_serial(0x5F);	/* R/W=W, RS=1 */
+	lcd_send_serial(data & 0x0F);
+	lcd_send_serial((data >> 4) & 0x0F);
+	udelay(40);		/* the shortest data takes at least 40 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the LCD panel in 8 bits parallel mode */
+static void lcd_write_cmd_p8(struct hd44780_common *hdc, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, cmd);
+	udelay(20);	/* maintain the data during 20 us before the strobe */
+
+	set_bit(LCD_BIT_E, bits);
+	clear_bit(LCD_BIT_RS, bits);
+	clear_bit(LCD_BIT_RW, bits);
+	set_ctrl_bits();
+
+	udelay(40);	/* maintain the strobe during 40 us */
+
+	clear_bit(LCD_BIT_E, bits);
+	set_ctrl_bits();
+
+	udelay(120);	/* the shortest command takes at least 120 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the LCD panel in 8 bits parallel mode */
+static void lcd_write_data_p8(struct hd44780_common *hdc, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, data);
+	udelay(20);	/* maintain the data during 20 us before the strobe */
+
+	set_bit(LCD_BIT_E, bits);
+	set_bit(LCD_BIT_RS, bits);
+	clear_bit(LCD_BIT_RW, bits);
+	set_ctrl_bits();
+
+	udelay(40);	/* maintain the strobe during 40 us */
+
+	clear_bit(LCD_BIT_E, bits);
+	set_ctrl_bits();
+
+	udelay(45);	/* the shortest data takes at least 45 us */
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send a command to the TI LCD panel */
+static void lcd_write_cmd_tilcd(struct hd44780_common *hdc, int cmd)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the control port */
+	w_ctr(pprt, cmd);
+	udelay(60);
+	spin_unlock_irq(&pprt_lock);
+}
+
+/* send data to the TI LCD panel */
+static void lcd_write_data_tilcd(struct hd44780_common *hdc, int data)
+{
+	spin_lock_irq(&pprt_lock);
+	/* present the data to the data port */
+	w_dtr(pprt, data);
+	udelay(60);
+	spin_unlock_irq(&pprt_lock);
+}
+
+static const struct charlcd_ops charlcd_ops = {
+	.backlight	= lcd_backlight,
+	.print		= hd44780_common_print,
+	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
+	.clear_display	= hd44780_common_clear_display,
+	.init_display	= hd44780_common_init_display,
+	.shift_cursor	= hd44780_common_shift_cursor,
+	.shift_display	= hd44780_common_shift_display,
+	.display	= hd44780_common_display,
+	.cursor		= hd44780_common_cursor,
+	.blink		= hd44780_common_blink,
+	.fontsize	= hd44780_common_fontsize,
+	.lines		= hd44780_common_lines,
+	.redefine_char	= hd44780_common_redefine_char,
+};
+
+/* initialize the LCD driver */
+static void lcd_init(void)
+{
+	struct charlcd *charlcd;
+	struct hd44780_common *hdc;
+
+	charlcd = hd44780_common_alloc();
+	if (!charlcd)
+		return;
+
+	hdc = charlcd->drvdata;
+	hdc->hd44780 = &lcd;
+
+	/*
+	 * Init lcd struct with load-time values to preserve exact
+	 * current functionality (at least for now).
+	 */
+	charlcd->height = lcd_height;
+	charlcd->width = lcd_width;
+	hdc->bwidth = lcd_bwidth;
+	hdc->hwidth = lcd_hwidth;
+
+	switch (selected_lcd_type) {
+	case LCD_TYPE_OLD:
+		/* parallel mode, 8 bits */
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_STROBE;
+		lcd.pins.rs = PIN_AUTOLF;
+
+		charlcd->width = 40;
+		hdc->bwidth = 40;
+		hdc->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_KS0074:
+		/* serial mode, ks0074 */
+		lcd.proto = LCD_PROTO_SERIAL;
+		lcd.charset = LCD_CHARSET_KS0074;
+		lcd.pins.bl = PIN_AUTOLF;
+		lcd.pins.cl = PIN_STROBE;
+		lcd.pins.da = PIN_D0;
+
+		charlcd->width = 16;
+		hdc->bwidth = 40;
+		hdc->hwidth = 16;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_NEXCOM:
+		/* parallel mode, 8 bits, generic */
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_AUTOLF;
+		lcd.pins.rs = PIN_SELECP;
+		lcd.pins.rw = PIN_INITP;
+
+		charlcd->width = 16;
+		hdc->bwidth = 40;
+		hdc->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	case LCD_TYPE_CUSTOM:
+		/* customer-defined */
+		lcd.proto = DEFAULT_LCD_PROTO;
+		lcd.charset = DEFAULT_LCD_CHARSET;
+		/* default geometry will be set later */
+		break;
+	case LCD_TYPE_HANTRONIX:
+		/* parallel mode, 8 bits, hantronix-like */
+	default:
+		lcd.proto = LCD_PROTO_PARALLEL;
+		lcd.charset = LCD_CHARSET_NORMAL;
+		lcd.pins.e = PIN_STROBE;
+		lcd.pins.rs = PIN_SELECP;
+
+		charlcd->width = 16;
+		hdc->bwidth = 40;
+		hdc->hwidth = 64;
+		charlcd->height = 2;
+		break;
+	}
+
+	/* Overwrite with module params set on loading */
+	if (lcd_height != NOT_SET)
+		charlcd->height = lcd_height;
+	if (lcd_width != NOT_SET)
+		charlcd->width = lcd_width;
+	if (lcd_bwidth != NOT_SET)
+		hdc->bwidth = lcd_bwidth;
+	if (lcd_hwidth != NOT_SET)
+		hdc->hwidth = lcd_hwidth;
+	if (lcd_charset != NOT_SET)
+		lcd.charset = lcd_charset;
+	if (lcd_proto != NOT_SET)
+		lcd.proto = lcd_proto;
+	if (lcd_e_pin != PIN_NOT_SET)
+		lcd.pins.e = lcd_e_pin;
+	if (lcd_rs_pin != PIN_NOT_SET)
+		lcd.pins.rs = lcd_rs_pin;
+	if (lcd_rw_pin != PIN_NOT_SET)
+		lcd.pins.rw = lcd_rw_pin;
+	if (lcd_cl_pin != PIN_NOT_SET)
+		lcd.pins.cl = lcd_cl_pin;
+	if (lcd_da_pin != PIN_NOT_SET)
+		lcd.pins.da = lcd_da_pin;
+	if (lcd_bl_pin != PIN_NOT_SET)
+		lcd.pins.bl = lcd_bl_pin;
+
+	/* this is used to catch wrong and default values */
+	if (charlcd->width <= 0)
+		charlcd->width = DEFAULT_LCD_WIDTH;
+	if (hdc->bwidth <= 0)
+		hdc->bwidth = DEFAULT_LCD_BWIDTH;
+	if (hdc->hwidth <= 0)
+		hdc->hwidth = DEFAULT_LCD_HWIDTH;
+	if (charlcd->height <= 0)
+		charlcd->height = DEFAULT_LCD_HEIGHT;
+
+	if (lcd.proto == LCD_PROTO_SERIAL) {	/* SERIAL */
+		charlcd->ops = &charlcd_ops;
+		hdc->write_data = lcd_write_data_s;
+		hdc->write_cmd = lcd_write_cmd_s;
+
+		if (lcd.pins.cl == PIN_NOT_SET)
+			lcd.pins.cl = DEFAULT_LCD_PIN_SCL;
+		if (lcd.pins.da == PIN_NOT_SET)
+			lcd.pins.da = DEFAULT_LCD_PIN_SDA;
+
+	} else if (lcd.proto == LCD_PROTO_PARALLEL) {	/* PARALLEL */
+		charlcd->ops = &charlcd_ops;
+		hdc->write_data = lcd_write_data_p8;
+		hdc->write_cmd = lcd_write_cmd_p8;
+
+		if (lcd.pins.e == PIN_NOT_SET)
+			lcd.pins.e = DEFAULT_LCD_PIN_E;
+		if (lcd.pins.rs == PIN_NOT_SET)
+			lcd.pins.rs = DEFAULT_LCD_PIN_RS;
+		if (lcd.pins.rw == PIN_NOT_SET)
+			lcd.pins.rw = DEFAULT_LCD_PIN_RW;
+	} else {
+		charlcd->ops = &charlcd_ops;
+		hdc->write_data = lcd_write_data_tilcd;
+		hdc->write_cmd = lcd_write_cmd_tilcd;
+	}
+
+	if (lcd.pins.bl == PIN_NOT_SET)
+		lcd.pins.bl = DEFAULT_LCD_PIN_BL;
+
+	if (lcd.pins.e == PIN_NOT_SET)
+		lcd.pins.e = PIN_NONE;
+	if (lcd.pins.rs == PIN_NOT_SET)
+		lcd.pins.rs = PIN_NONE;
+	if (lcd.pins.rw == PIN_NOT_SET)
+		lcd.pins.rw = PIN_NONE;
+	if (lcd.pins.bl == PIN_NOT_SET)
+		lcd.pins.bl = PIN_NONE;
+	if (lcd.pins.cl == PIN_NOT_SET)
+		lcd.pins.cl = PIN_NONE;
+	if (lcd.pins.da == PIN_NOT_SET)
+		lcd.pins.da = PIN_NONE;
+
+	if (lcd.charset == NOT_SET)
+		lcd.charset = DEFAULT_LCD_CHARSET;
+
+	if (lcd.charset == LCD_CHARSET_KS0074)
+		charlcd->char_conv = lcd_char_conv_ks0074;
+	else
+		charlcd->char_conv = NULL;
+
+	pin_to_bits(lcd.pins.e, lcd_bits[LCD_PORT_D][LCD_BIT_E],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_E]);
+	pin_to_bits(lcd.pins.rs, lcd_bits[LCD_PORT_D][LCD_BIT_RS],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_RS]);
+	pin_to_bits(lcd.pins.rw, lcd_bits[LCD_PORT_D][LCD_BIT_RW],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_RW]);
+	pin_to_bits(lcd.pins.bl, lcd_bits[LCD_PORT_D][LCD_BIT_BL],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_BL]);
+	pin_to_bits(lcd.pins.cl, lcd_bits[LCD_PORT_D][LCD_BIT_CL],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_CL]);
+	pin_to_bits(lcd.pins.da, lcd_bits[LCD_PORT_D][LCD_BIT_DA],
+		    lcd_bits[LCD_PORT_C][LCD_BIT_DA]);
+
+	lcd.charlcd = charlcd;
+	lcd.initialized = true;
+}
+
+/*
+ * These are the file operation function for user access to /dev/keypad
+ */
+
+static ssize_t keypad_read(struct file *file,
+			   char __user *buf, size_t count, loff_t *ppos)
+{
+	unsigned i = *ppos;
+	char __user *tmp = buf;
+
+	if (keypad_buflen == 0) {
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		if (wait_event_interruptible(keypad_read_wait,
+					     keypad_buflen != 0))
+			return -EINTR;
+	}
+
+	for (; count-- > 0 && (keypad_buflen > 0);
+	     ++i, ++tmp, --keypad_buflen) {
+		put_user(keypad_buffer[keypad_start], tmp);
+		keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
+	}
+	*ppos = i;
+
+	return tmp - buf;
+}
+
+static int keypad_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = -EBUSY;
+	if (!atomic_dec_and_test(&keypad_available))
+		goto fail;	/* open only once at a time */
+
+	ret = -EPERM;
+	if (file->f_mode & FMODE_WRITE)	/* device is read-only */
+		goto fail;
+
+	keypad_buflen = 0;	/* flush the buffer on opening */
+	return 0;
+ fail:
+	atomic_inc(&keypad_available);
+	return ret;
+}
+
+static int keypad_release(struct inode *inode, struct file *file)
+{
+	atomic_inc(&keypad_available);
+	return 0;
+}
+
+static const struct file_operations keypad_fops = {
+	.read    = keypad_read,		/* read */
+	.open    = keypad_open,		/* open */
+	.release = keypad_release,	/* close */
+	.llseek  = default_llseek,
+};
+
+static struct miscdevice keypad_dev = {
+	.minor	= KEYPAD_MINOR,
+	.name	= "keypad",
+	.fops	= &keypad_fops,
+};
+
+static void keypad_send_key(const char *string, int max_len)
+{
+	/* send the key to the device only if a process is attached to it. */
+	if (!atomic_read(&keypad_available)) {
+		while (max_len-- && keypad_buflen < KEYPAD_BUFFER && *string) {
+			keypad_buffer[(keypad_start + keypad_buflen++) %
+				      KEYPAD_BUFFER] = *string++;
+		}
+		wake_up_interruptible(&keypad_read_wait);
+	}
+}
+
+/* this function scans all the bits involving at least one logical signal,
+ * and puts the results in the bitfield "phys_read" (one bit per established
+ * contact), and sets "phys_read_prev" to "phys_read".
+ *
+ * Note: to debounce input signals, we will only consider as switched a signal
+ * which is stable across 2 measures. Signals which are different between two
+ * reads will be kept as they previously were in their logical form (phys_prev).
+ * A signal which has just switched will have a 1 in
+ * (phys_read ^ phys_read_prev).
+ */
+static void phys_scan_contacts(void)
+{
+	int bit, bitval;
+	char oldval;
+	char bitmask;
+	char gndmask;
+
+	phys_prev = phys_curr;
+	phys_read_prev = phys_read;
+	phys_read = 0;		/* flush all signals */
+
+	/* keep track of old value, with all outputs disabled */
+	oldval = r_dtr(pprt) | scan_mask_o;
+	/* activate all keyboard outputs (active low) */
+	w_dtr(pprt, oldval & ~scan_mask_o);
+
+	/* will have a 1 for each bit set to gnd */
+	bitmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
+	/* disable all matrix signals */
+	w_dtr(pprt, oldval);
+
+	/* now that all outputs are cleared, the only active input bits are
+	 * directly connected to the ground
+	 */
+
+	/* 1 for each grounded input */
+	gndmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
+
+	/* grounded inputs are signals 40-44 */
+	phys_read |= (__u64)gndmask << 40;
+
+	if (bitmask != gndmask) {
+		/*
+		 * since clearing the outputs changed some inputs, we know
+		 * that some input signals are currently tied to some outputs.
+		 * So we'll scan them.
+		 */
+		for (bit = 0; bit < 8; bit++) {
+			bitval = BIT(bit);
+
+			if (!(scan_mask_o & bitval))	/* skip unused bits */
+				continue;
+
+			w_dtr(pprt, oldval & ~bitval);	/* enable this output */
+			bitmask = PNL_PINPUT(r_str(pprt)) & ~gndmask;
+			phys_read |= (__u64)bitmask << (5 * bit);
+		}
+		w_dtr(pprt, oldval);	/* disable all outputs */
+	}
+	/*
+	 * this is easy: use old bits when they are flapping,
+	 * use new ones when stable
+	 */
+	phys_curr = (phys_prev & (phys_read ^ phys_read_prev)) |
+		    (phys_read & ~(phys_read ^ phys_read_prev));
+}
+
+static inline int input_state_high(struct logical_input *input)
+{
+#if 0
+	/* FIXME:
+	 * this is an invalid test. It tries to catch
+	 * transitions from single-key to multiple-key, but
+	 * doesn't take into account the contacts polarity.
+	 * The only solution to the problem is to parse keys
+	 * from the most complex to the simplest combinations,
+	 * and mark them as 'caught' once a combination
+	 * matches, then unmatch it for all other ones.
+	 */
+
+	/* try to catch dangerous transitions cases :
+	 * someone adds a bit, so this signal was a false
+	 * positive resulting from a transition. We should
+	 * invalidate the signal immediately and not call the
+	 * release function.
+	 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
+	 */
+	if (((phys_prev & input->mask) == input->value) &&
+	    ((phys_curr & input->mask) >  input->value)) {
+		input->state = INPUT_ST_LOW; /* invalidate */
+		return 1;
+	}
+#endif
+
+	if ((phys_curr & input->mask) == input->value) {
+		if ((input->type == INPUT_TYPE_STD) &&
+		    (input->high_timer == 0)) {
+			input->high_timer++;
+			if (input->u.std.press_fct)
+				input->u.std.press_fct(input->u.std.press_data);
+		} else if (input->type == INPUT_TYPE_KBD) {
+			/* will turn on the light */
+			keypressed = 1;
+
+			if (input->high_timer == 0) {
+				char *press_str = input->u.kbd.press_str;
+
+				if (press_str[0]) {
+					int s = sizeof(input->u.kbd.press_str);
+
+					keypad_send_key(press_str, s);
+				}
+			}
+
+			if (input->u.kbd.repeat_str[0]) {
+				char *repeat_str = input->u.kbd.repeat_str;
+
+				if (input->high_timer >= KEYPAD_REP_START) {
+					int s = sizeof(input->u.kbd.repeat_str);
+
+					input->high_timer -= KEYPAD_REP_DELAY;
+					keypad_send_key(repeat_str, s);
+				}
+				/* we will need to come back here soon */
+				inputs_stable = 0;
+			}
+
+			if (input->high_timer < 255)
+				input->high_timer++;
+		}
+		return 1;
+	}
+
+	/* else signal falling down. Let's fall through. */
+	input->state = INPUT_ST_FALLING;
+	input->fall_timer = 0;
+
+	return 0;
+}
+
+static inline void input_state_falling(struct logical_input *input)
+{
+#if 0
+	/* FIXME !!! same comment as in input_state_high */
+	if (((phys_prev & input->mask) == input->value) &&
+	    ((phys_curr & input->mask) >  input->value)) {
+		input->state = INPUT_ST_LOW;	/* invalidate */
+		return;
+	}
+#endif
+
+	if ((phys_curr & input->mask) == input->value) {
+		if (input->type == INPUT_TYPE_KBD) {
+			/* will turn on the light */
+			keypressed = 1;
+
+			if (input->u.kbd.repeat_str[0]) {
+				char *repeat_str = input->u.kbd.repeat_str;
+
+				if (input->high_timer >= KEYPAD_REP_START) {
+					int s = sizeof(input->u.kbd.repeat_str);
+
+					input->high_timer -= KEYPAD_REP_DELAY;
+					keypad_send_key(repeat_str, s);
+				}
+				/* we will need to come back here soon */
+				inputs_stable = 0;
+			}
+
+			if (input->high_timer < 255)
+				input->high_timer++;
+		}
+		input->state = INPUT_ST_HIGH;
+	} else if (input->fall_timer >= input->fall_time) {
+		/* call release event */
+		if (input->type == INPUT_TYPE_STD) {
+			void (*release_fct)(int) = input->u.std.release_fct;
+
+			if (release_fct)
+				release_fct(input->u.std.release_data);
+		} else if (input->type == INPUT_TYPE_KBD) {
+			char *release_str = input->u.kbd.release_str;
+
+			if (release_str[0]) {
+				int s = sizeof(input->u.kbd.release_str);
+
+				keypad_send_key(release_str, s);
+			}
+		}
+
+		input->state = INPUT_ST_LOW;
+	} else {
+		input->fall_timer++;
+		inputs_stable = 0;
+	}
+}
+
+static void panel_process_inputs(void)
+{
+	struct logical_input *input;
+
+	keypressed = 0;
+	inputs_stable = 1;
+	list_for_each_entry(input, &logical_inputs, list) {
+		switch (input->state) {
+		case INPUT_ST_LOW:
+			if ((phys_curr & input->mask) != input->value)
+				break;
+			/* if all needed ones were already set previously,
+			 * this means that this logical signal has been
+			 * activated by the releasing of another combined
+			 * signal, so we don't want to match.
+			 * eg: AB -(release B)-> A -(release A)-> 0 :
+			 *     don't match A.
+			 */
+			if ((phys_prev & input->mask) == input->value)
+				break;
+			input->rise_timer = 0;
+			input->state = INPUT_ST_RISING;
+			fallthrough;
+		case INPUT_ST_RISING:
+			if ((phys_curr & input->mask) != input->value) {
+				input->state = INPUT_ST_LOW;
+				break;
+			}
+			if (input->rise_timer < input->rise_time) {
+				inputs_stable = 0;
+				input->rise_timer++;
+				break;
+			}
+			input->high_timer = 0;
+			input->state = INPUT_ST_HIGH;
+			fallthrough;
+		case INPUT_ST_HIGH:
+			if (input_state_high(input))
+				break;
+			fallthrough;
+		case INPUT_ST_FALLING:
+			input_state_falling(input);
+		}
+	}
+}
+
+static void panel_scan_timer(struct timer_list *unused)
+{
+	if (keypad.enabled && keypad_initialized) {
+		if (spin_trylock_irq(&pprt_lock)) {
+			phys_scan_contacts();
+
+			/* no need for the parport anymore */
+			spin_unlock_irq(&pprt_lock);
+		}
+
+		if (!inputs_stable || phys_curr != phys_prev)
+			panel_process_inputs();
+	}
+
+	if (keypressed && lcd.enabled && lcd.initialized)
+		charlcd_poke(lcd.charlcd);
+
+	mod_timer(&scan_timer, jiffies + INPUT_POLL_TIME);
+}
+
+static void init_scan_timer(void)
+{
+	if (scan_timer.function)
+		return;		/* already started */
+
+	timer_setup(&scan_timer, panel_scan_timer, 0);
+	scan_timer.expires = jiffies + INPUT_POLL_TIME;
+	add_timer(&scan_timer);
+}
+
+/* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
+ * if <omask> or <imask> are non-null, they will be or'ed with the bits
+ * corresponding to out and in bits respectively.
+ * returns 1 if ok, 0 if error (in which case, nothing is written).
+ */
+static u8 input_name2mask(const char *name, __u64 *mask, __u64 *value,
+			  u8 *imask, u8 *omask)
+{
+	const char sigtab[] = "EeSsPpAaBb";
+	u8 im, om;
+	__u64 m, v;
+
+	om = 0;
+	im = 0;
+	m = 0ULL;
+	v = 0ULL;
+	while (*name) {
+		int in, out, bit, neg;
+		const char *idx;
+
+		idx = strchr(sigtab, *name);
+		if (!idx)
+			return 0;	/* input name not found */
+
+		in = idx - sigtab;
+		neg = (in & 1);	/* odd (lower) names are negated */
+		in >>= 1;
+		im |= BIT(in);
+
+		name++;
+		if (*name >= '0' && *name <= '7') {
+			out = *name - '0';
+			om |= BIT(out);
+		} else if (*name == '-') {
+			out = 8;
+		} else {
+			return 0;	/* unknown bit name */
+		}
+
+		bit = (out * 5) + in;
+
+		m |= 1ULL << bit;
+		if (!neg)
+			v |= 1ULL << bit;
+		name++;
+	}
+	*mask = m;
+	*value = v;
+	if (imask)
+		*imask |= im;
+	if (omask)
+		*omask |= om;
+	return 1;
+}
+
+/* tries to bind a key to the signal name <name>. The key will send the
+ * strings <press>, <repeat>, <release> for these respective events.
+ * Returns the pointer to the new key if ok, NULL if the key could not be bound.
+ */
+static struct logical_input *panel_bind_key(const char *name, const char *press,
+					    const char *repeat,
+					    const char *release)
+{
+	struct logical_input *key;
+
+	key = kzalloc_obj(*key);
+	if (!key)
+		return NULL;
+
+	if (!input_name2mask(name, &key->mask, &key->value, &scan_mask_i,
+			     &scan_mask_o)) {
+		kfree(key);
+		return NULL;
+	}
+
+	key->type = INPUT_TYPE_KBD;
+	key->state = INPUT_ST_LOW;
+	key->rise_time = 1;
+	key->fall_time = 1;
+
+	strtomem_pad(key->u.kbd.press_str, press, '\0');
+	strtomem_pad(key->u.kbd.repeat_str, repeat, '\0');
+	strtomem_pad(key->u.kbd.release_str, release, '\0');
+	list_add(&key->list, &logical_inputs);
+	return key;
+}
+
+static void keypad_init(void)
+{
+	int keynum;
+
+	init_waitqueue_head(&keypad_read_wait);
+	keypad_buflen = 0;	/* flushes any eventual noisy keystroke */
+
+	/* Let's create all known keys */
+
+	for (keynum = 0; keypad_profile[keynum][0][0]; keynum++) {
+		panel_bind_key(keypad_profile[keynum][0],
+			       keypad_profile[keynum][1],
+			       keypad_profile[keynum][2],
+			       keypad_profile[keynum][3]);
+	}
+
+	init_scan_timer();
+	keypad_initialized = 1;
+}
+
+/**************************************************/
+/* device initialization                          */
+/**************************************************/
+
+static void panel_attach(struct parport *port)
+{
+	int selected_keypad_type = NOT_SET;
+	struct pardev_cb panel_cb;
+
+	/* take care of an eventual profile */
+	switch (profile) {
+	case PANEL_PROFILE_CUSTOM:
+		/* custom profile */
+		selected_keypad_type = DEFAULT_KEYPAD_TYPE;
+		selected_lcd_type = DEFAULT_LCD_TYPE;
+		break;
+	case PANEL_PROFILE_OLD:
+		/* 8 bits, 2*16, old keypad */
+		selected_keypad_type = KEYPAD_TYPE_OLD;
+		selected_lcd_type = LCD_TYPE_OLD;
+
+		/* TODO: This two are a little hacky, sort it out later */
+		if (lcd_width == NOT_SET)
+			lcd_width = 16;
+		if (lcd_hwidth == NOT_SET)
+			lcd_hwidth = 16;
+		break;
+	case PANEL_PROFILE_NEW:
+		/* serial, 2*16, new keypad */
+		selected_keypad_type = KEYPAD_TYPE_NEW;
+		selected_lcd_type = LCD_TYPE_KS0074;
+		break;
+	case PANEL_PROFILE_HANTRONIX:
+		/* 8 bits, 2*16 hantronix-like, no keypad */
+		selected_keypad_type = KEYPAD_TYPE_NONE;
+		selected_lcd_type = LCD_TYPE_HANTRONIX;
+		break;
+	case PANEL_PROFILE_NEXCOM:
+		/* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
+		selected_keypad_type = KEYPAD_TYPE_NEXCOM;
+		selected_lcd_type = LCD_TYPE_NEXCOM;
+		break;
+	case PANEL_PROFILE_LARGE:
+		/* 8 bits, 2*40, old keypad */
+		selected_keypad_type = KEYPAD_TYPE_OLD;
+		selected_lcd_type = LCD_TYPE_OLD;
+		break;
+	}
+
+	/*
+	 * Overwrite selection with module param values (both keypad and lcd),
+	 * where the deprecated params have lower prio.
+	 */
+	if (keypad_enabled != NOT_SET)
+		selected_keypad_type = keypad_enabled;
+	if (keypad_type != NOT_SET)
+		selected_keypad_type = keypad_type;
+
+	keypad.enabled = (selected_keypad_type > 0);
+
+	if (lcd_enabled != NOT_SET)
+		selected_lcd_type = lcd_enabled;
+	if (lcd_type != NOT_SET)
+		selected_lcd_type = lcd_type;
+
+	lcd.enabled = (selected_lcd_type > 0);
+
+	if (lcd.enabled) {
+		/*
+		 * Init lcd struct with load-time values to preserve exact
+		 * current functionality (at least for now).
+		 */
+		lcd.charset = lcd_charset;
+		lcd.proto = lcd_proto;
+		lcd.pins.e = lcd_e_pin;
+		lcd.pins.rs = lcd_rs_pin;
+		lcd.pins.rw = lcd_rw_pin;
+		lcd.pins.cl = lcd_cl_pin;
+		lcd.pins.da = lcd_da_pin;
+		lcd.pins.bl = lcd_bl_pin;
+	}
+
+	switch (selected_keypad_type) {
+	case KEYPAD_TYPE_OLD:
+		keypad_profile = old_keypad_profile;
+		break;
+	case KEYPAD_TYPE_NEW:
+		keypad_profile = new_keypad_profile;
+		break;
+	case KEYPAD_TYPE_NEXCOM:
+		keypad_profile = nexcom_keypad_profile;
+		break;
+	default:
+		keypad_profile = NULL;
+		break;
+	}
+
+	if (!lcd.enabled && !keypad.enabled) {
+		/* no device enabled, let's exit */
+		pr_err("panel driver disabled.\n");
+		return;
+	}
+
+	if (port->number != parport)
+		return;
+
+	if (pprt) {
+		pr_err("%s: port->number=%d parport=%d, already registered!\n",
+		       __func__, port->number, parport);
+		return;
+	}
+
+	memset(&panel_cb, 0, sizeof(panel_cb));
+	panel_cb.private = &pprt;
+	/* panel_cb.flags = 0 should be PARPORT_DEV_EXCL? */
+
+	pprt = parport_register_dev_model(port, "panel", &panel_cb, 0);
+	if (!pprt) {
+		pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
+		       __func__, port->number, parport);
+		return;
+	}
+
+	if (parport_claim(pprt)) {
+		pr_err("could not claim access to parport%d. Aborting.\n",
+		       parport);
+		goto err_unreg_device;
+	}
+
+	/* must init LCD first, just in case an IRQ from the keypad is
+	 * generated at keypad init
+	 */
+	if (lcd.enabled) {
+		lcd_init();
+		if (!lcd.charlcd || charlcd_register(lcd.charlcd))
+			goto err_unreg_device;
+	}
+
+	if (keypad.enabled) {
+		keypad_init();
+		if (misc_register(&keypad_dev))
+			goto err_lcd_unreg;
+	}
+	return;
+
+err_lcd_unreg:
+	if (scan_timer.function)
+		timer_delete_sync(&scan_timer);
+	if (lcd.enabled)
+		charlcd_unregister(lcd.charlcd);
+err_unreg_device:
+	hd44780_common_free(lcd.charlcd);
+	lcd.charlcd = NULL;
+	parport_unregister_device(pprt);
+	pprt = NULL;
+}
+
+static void panel_detach(struct parport *port)
+{
+	if (port->number != parport)
+		return;
+
+	if (!pprt) {
+		pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
+		       __func__, port->number, parport);
+		return;
+	}
+	if (scan_timer.function)
+		timer_delete_sync(&scan_timer);
+
+	if (keypad.enabled) {
+		misc_deregister(&keypad_dev);
+		keypad_initialized = 0;
+	}
+
+	if (lcd.enabled) {
+		charlcd_unregister(lcd.charlcd);
+		lcd.initialized = false;
+		hd44780_common_free(lcd.charlcd);
+		lcd.charlcd = NULL;
+	}
+
+	/* TODO: free all input signals */
+	parport_release(pprt);
+	parport_unregister_device(pprt);
+	pprt = NULL;
+}
+
+static struct parport_driver panel_driver = {
+	.name = "panel",
+	.match_port = panel_attach,
+	.detach = panel_detach,
+};
+module_parport_driver(panel_driver);
+
+MODULE_AUTHOR("Willy Tarreau");
+MODULE_LICENSE("GPL");
diff --git a/drivers/auxdisplay/seg-led-gpio.c b/drivers/auxdisplay/seg-led-gpio.c
new file mode 100644
index 000000000..bc463118f
--- /dev/null
+++ b/drivers/auxdisplay/seg-led-gpio.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for a 7-segment LED display
+ *
+ * The decimal point LED present on some devices is currently not
+ * supported.
+ *
+ * Copyright (C) Allied Telesis Labs
+ */
+
+#include <linux/bitmap.h>
+#include <linux/container_of.h>
+#include <linux/errno.h>
+#include <linux/gpio/consumer.h>
+#include <linux/map_to_7segment.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "line-display.h"
+
+struct seg_led_priv {
+	struct linedisp linedisp;
+	struct delayed_work work;
+	struct gpio_descs *segment_gpios;
+};
+
+static void seg_led_update(struct work_struct *work)
+{
+	struct seg_led_priv *priv = container_of(work, struct seg_led_priv, work.work);
+	struct linedisp *linedisp = &priv->linedisp;
+	struct linedisp_map *map = linedisp->map;
+	DECLARE_BITMAP(values, 8) = { };
+
+	bitmap_set_value8(values, map_to_seg7(&map->map.seg7, linedisp->buf[0]), 0);
+
+	gpiod_multi_set_value_cansleep(priv->segment_gpios, values);
+}
+
+static int seg_led_linedisp_get_map_type(struct linedisp *linedisp)
+{
+	struct seg_led_priv *priv = container_of(linedisp, struct seg_led_priv, linedisp);
+
+	INIT_DELAYED_WORK(&priv->work, seg_led_update);
+	return LINEDISP_MAP_SEG7;
+}
+
+static void seg_led_linedisp_update(struct linedisp *linedisp)
+{
+	struct seg_led_priv *priv = container_of(linedisp, struct seg_led_priv, linedisp);
+
+	schedule_delayed_work(&priv->work, 0);
+}
+
+static const struct linedisp_ops seg_led_linedisp_ops = {
+	.get_map_type = seg_led_linedisp_get_map_type,
+	.update = seg_led_linedisp_update,
+};
+
+static int seg_led_probe(struct platform_device *pdev)
+{
+	struct seg_led_priv *priv;
+	struct device *dev = &pdev->dev;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->segment_gpios = devm_gpiod_get_array(dev, "segment", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->segment_gpios))
+		return PTR_ERR(priv->segment_gpios);
+
+	if (priv->segment_gpios->ndescs < 7 || priv->segment_gpios->ndescs > 8)
+		return -EINVAL;
+
+	return linedisp_register(&priv->linedisp, dev, 1, &seg_led_linedisp_ops);
+}
+
+static void seg_led_remove(struct platform_device *pdev)
+{
+	struct seg_led_priv *priv = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&priv->work);
+	linedisp_unregister(&priv->linedisp);
+}
+
+static const struct of_device_id seg_led_of_match[] = {
+	{ .compatible = "gpio-7-segment"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, seg_led_of_match);
+
+static struct platform_driver seg_led_driver = {
+	.probe = seg_led_probe,
+	.remove = seg_led_remove,
+	.driver = {
+		.name = "seg-led-gpio",
+		.of_match_table = seg_led_of_match,
+	},
+};
+module_platform_driver(seg_led_driver);
+
+MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>");
+MODULE_DESCRIPTION("7 segment LED driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("LINEDISP");