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Linux/Documentation/ABI/testing/gpio-cdev

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  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 in
 10                 [include/uapi]<linux/gpio.h> and documented in
 11                 Documentation/userspace-api/gpio/chardev.rst.
 12 
 13                 The following file operations are supported:
 14 
 15                 open(2)
 16                   Currently the only useful flags are O_RDWR.
 17 
 18                 ioctl(2)
 19                   Initiate various actions.
 20 
 21                   See Documentation/userspace-api/gpio/chardev.rst
 22                   for a description of all ioctls.
 23 
 24                 close(2)
 25                   Stops and free up the I/O contexts that was associated
 26                   with the file descriptor.
 27 
 28 Users:          TBD
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