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Commit | Line | Data |
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40c159b7 LW |
1 | What: /dev/gpiochip[0-9]+ |
2 | Date: November 2015 | |
3 | KernelVersion: 4.4 | |
4 | Contact: linux-gpio@vger.kernel.org | |
5 | Description: | |
6 | The character device files /dev/gpiochip* are the interface | |
7 | between GPIO chips and userspace. | |
8 | ||
9 | The ioctl(2)-based ABI is defined and documented in | |
10 | [include/uapi]<linux/gpio.h>. | |
11 | ||
12 | The following file operations are supported: | |
13 | ||
14 | open(2) | |
15 | Currently the only useful flags are O_RDWR. | |
16 | ||
17 | ioctl(2) | |
18 | Initiate various actions. | |
19 | See the inline documentation in [include/uapi]<linux/gpio.h> | |
20 | for descriptions of all ioctls. | |
21 | ||
22 | close(2) | |
23 | Stops and free up the I/O contexts that was associated | |
24 | with the file descriptor. | |
25 | ||
26 | Users: TBD |