From e8dd273d199f5bbe295a8e3d8b777c5505b6b2e1 Mon Sep 17 00:00:00 2001 From: Salah Triki Date: Thu, 17 Sep 2026 14:00:52 +0100 Subject: iio: proximity: isl29501: Fix return type of isl29501_register_write isl29501_register_write() was returning a u32 instead of an int. Since the function returns negative error codes (such as -ERANGE or return values from i2c_smbus_write_byte_data()), returning an unsigned integer type prevents callers from correctly checking for negative error conditions. Fix this by changing the function return type from u32 to int. This was found through manual code review. Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.") Signed-off-by: Salah Triki Reviewed-by: Joshua Crofts Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- .../admin-guide/auxdisplay/cfag12864b.rst | 98 ++++++++++++++++++++++ Documentation/admin-guide/auxdisplay/index.rst | 9 ++ Documentation/admin-guide/auxdisplay/ks0108.rst | 50 +++++++++++ 3 files changed, 157 insertions(+) create mode 100644 Documentation/admin-guide/auxdisplay/cfag12864b.rst create mode 100644 Documentation/admin-guide/auxdisplay/index.rst create mode 100644 Documentation/admin-guide/auxdisplay/ks0108.rst (limited to 'Documentation/admin-guide/auxdisplay') diff --git a/Documentation/admin-guide/auxdisplay/cfag12864b.rst b/Documentation/admin-guide/auxdisplay/cfag12864b.rst new file mode 100644 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 +: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 new file mode 100644 index 000000000..31eae0825 --- /dev/null +++ b/Documentation/admin-guide/auxdisplay/index.rst @@ -0,0 +1,9 @@ +========================= +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 --- /dev/null +++ b/Documentation/admin-guide/auxdisplay/ks0108.rst @@ -0,0 +1,50 @@ +========================================== +ks0108 LCD Controller Driver Documentation +========================================== + +:License: GPLv2 +:Author & Maintainer: Miguel Ojeda +: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 -- cgit v1.3.1