Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 14:41:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

gpio: add a userspace character device ABI

Browse Source 
Put in some documentation for the new character device ABI
so we can properly etch it in stone.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-10-22 10:21:57 +02:00
parent 6d591c46bc
commit 40c159b776
2 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
Documentation/ABI/testing/gpio-cdev Normal file
View File

@ -0,0 +1,26 @@
What: /dev/gpiochip[0-9]+
Date: November 2015
KernelVersion: 4.4
Contact: linux-gpio@vger.kernel.org
Description:
The character device files /dev/gpiochip* are the interface
between GPIO chips and userspace.
The ioctl(2)-based ABI is defined and documented in
[include/uapi]<linux/gpio.h>.
The following file operations are supported:
open(2)
Currently the only useful flags are O_RDWR.
ioctl(2)
Initiate various actions.
See the inline documentation in [include/uapi]<linux/gpio.h>
for descriptions of all ioctls.
close(2)
Stops and free up the I/O contexts that was associated
with the file descriptor.
Users: TBD

1
MAINTAINERS
View File

@ -4815,6 +4815,7 @@ L: linux-gpio@vger.kernel.org
T: git git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
S: Maintained
F: Documentation/gpio/
F: Documentation/ABI/testing/gpio-cdev
F: drivers/gpio/
F: include/linux/gpio/
F: include/linux/gpio.h