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authorKees Cook <kees+treewide@kernel.org>2026-09-02 15:31:14 -0700
committerKees Cook <kees@kernel.org>2026-09-04 21:37:00 -0700
commit3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d (patch)
treec65086f9bdcd48c6360fb7cb4598bca084da1f32 /Documentation/admin-guide/auxdisplay
downloadlinux-stable-3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d.tar.gz
linux-stable-3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d.zip
treewide: refresh kmalloc_obj() conversionsgrafted
This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook <kees+treewide@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/auxdisplay')
-rw-r--r--Documentation/admin-guide/auxdisplay/cfag12864b.rst98
-rw-r--r--Documentation/admin-guide/auxdisplay/index.rst9
-rw-r--r--Documentation/admin-guide/auxdisplay/ks0108.rst50
3 files changed, 157 insertions, 0 deletions
diff --git a/Documentation/admin-guide/auxdisplay/cfag12864b.rst b/Documentation/admin-guide/auxdisplay/cfag12864b.rst
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index 000000000..da385d851
--- /dev/null
+++ b/Documentation/admin-guide/auxdisplay/cfag12864b.rst
@@ -0,0 +1,98 @@
+===================================
+cfag12864b LCD Driver Documentation
+===================================
+
+:License: GPLv2
+:Author & Maintainer: Miguel Ojeda <ojeda@kernel.org>
+:Date: 2006-10-27
+
+
+
+.. INDEX
+
+ 1. DRIVER INFORMATION
+ 2. DEVICE INFORMATION
+ 3. WIRING
+ 4. USERSPACE PROGRAMMING
+
+1. Driver Information
+---------------------
+
+This driver supports a cfag12864b LCD.
+
+
+2. Device Information
+---------------------
+
+:Manufacturer: Crystalfontz
+:Device Name: Crystalfontz 12864b LCD Series
+:Device Code: cfag12864b
+:Webpage: http://www.crystalfontz.com
+:Device Webpage: http://www.crystalfontz.com/products/12864b/
+:Type: LCD (Liquid Crystal Display)
+:Width: 128
+:Height: 64
+:Colors: 2 (B/N)
+:Controller: ks0108
+:Controllers: 2
+:Pages: 8 each controller
+:Addresses: 64 each page
+:Data size: 1 byte each address
+:Memory size: 2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte
+
+
+3. Wiring
+---------
+
+The cfag12864b LCD Series don't have official wiring.
+
+The common wiring is done to the parallel port as shown::
+
+ Parallel Port cfag12864b
+
+ Name Pin# Pin# Name
+
+ Strobe ( 1)------------------------------(17) Enable
+ Data 0 ( 2)------------------------------( 4) Data 0
+ Data 1 ( 3)------------------------------( 5) Data 1
+ Data 2 ( 4)------------------------------( 6) Data 2
+ Data 3 ( 5)------------------------------( 7) Data 3
+ Data 4 ( 6)------------------------------( 8) Data 4
+ Data 5 ( 7)------------------------------( 9) Data 5
+ Data 6 ( 8)------------------------------(10) Data 6
+ Data 7 ( 9)------------------------------(11) Data 7
+ (10) [+5v]---( 1) Vdd
+ (11) [GND]---( 2) Ground
+ (12) [+5v]---(14) Reset
+ (13) [GND]---(15) Read / Write
+ Line (14)------------------------------(13) Controller Select 1
+ (15)
+ Init (16)------------------------------(12) Controller Select 2
+ Select (17)------------------------------(16) Data / Instruction
+ Ground (18)---[GND] [+5v]---(19) LED +
+ Ground (19)---[GND]
+ Ground (20)---[GND] E A Values:
+ Ground (21)---[GND] [GND]---[P1]---(18) Vee - R = Resistor = 22 ohm
+ Ground (22)---[GND] | - P1 = Preset = 10 Kohm
+ Ground (23)---[GND] ---- S ------( 3) V0 - P2 = Preset = 1 Kohm
+ Ground (24)---[GND] | |
+ Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -
+
+
+4. Userspace Programming
+------------------------
+
+The cfag12864bfb describes a framebuffer device (/dev/fbX).
+
+It has a size of 1024 bytes = 1 Kbyte.
+Each bit represents one pixel. If the bit is high, the pixel will
+turn on. If the pixel is low, the pixel will turn off.
+
+You can use the framebuffer as a file: fopen, fwrite, fclose...
+Although the LCD won't get updated until the next refresh time arrives.
+
+Also, you can mmap the framebuffer: open & mmap, munmap & close...
+which is the best option for most uses.
+
+Check samples/auxdisplay/cfag12864b-example.c
+for a real working userspace complete program with usage examples.
diff --git a/Documentation/admin-guide/auxdisplay/index.rst b/Documentation/admin-guide/auxdisplay/index.rst
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index 000000000..31eae0825
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+++ b/Documentation/admin-guide/auxdisplay/index.rst
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+=========================
+Auxiliary Display Support
+=========================
+
+.. toctree::
+ :maxdepth: 1
+
+ ks0108.rst
+ cfag12864b.rst
diff --git a/Documentation/admin-guide/auxdisplay/ks0108.rst b/Documentation/admin-guide/auxdisplay/ks0108.rst
new file mode 100644
index 000000000..a7d3fe509
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+++ b/Documentation/admin-guide/auxdisplay/ks0108.rst
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+==========================================
+ks0108 LCD Controller Driver Documentation
+==========================================
+
+:License: GPLv2
+:Author & Maintainer: Miguel Ojeda <ojeda@kernel.org>
+:Date: 2006-10-27
+
+
+
+.. INDEX
+
+ 1. DRIVER INFORMATION
+ 2. DEVICE INFORMATION
+ 3. WIRING
+
+
+1. Driver Information
+---------------------
+
+This driver supports the ks0108 LCD controller.
+
+
+2. Device Information
+---------------------
+
+:Manufacturer: Samsung
+:Device Name: KS0108 LCD Controller
+:Device Code: ks0108
+:Webpage: -
+:Device Webpage: -
+:Type: LCD Controller (Liquid Crystal Display Controller)
+:Width: 64
+:Height: 64
+:Colors: 2 (B/N)
+:Pages: 8
+:Addresses: 64 each page
+:Data size: 1 byte each address
+:Memory size: 8 * 64 * 1 = 512 bytes
+
+
+3. Wiring
+---------
+
+The driver supports data parallel port wiring.
+
+If you aren't building LCD related hardware, you should check
+your LCD specific wiring information in the same folder.
+
+For example, check Documentation/admin-guide/auxdisplay/cfag12864b.rst