include/uapi/linux/gpio.h

   1 /*
   2  * <linux/gpio.h> - userspace ABI for the GPIO character devices
   3  *
   4  * Copyright (C) 2015 Linus Walleij
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10 #ifndef _UAPI_GPIO_H_
  11 #define _UAPI_GPIO_H_
  12
  13 #include <linux/ioctl.h>
  14 #include <linux/types.h>
  15
  16 /**
  17  * struct gpiochip_info - Information about a certain GPIO chip
  18  * @name: the Linux kernel name of this GPIO chip
  19  * @label: a functional name for this GPIO chip, such as a product
  20  * number, may be NULL
  21  * @lines: number of GPIO lines on this chip
  22  */
  23 struct gpiochip_info {
  24         char name[32];
  25         char label[32];
  26         __u32 lines;
  27 };
  28
  29 /* Line is in use by the kernel */
  30 #define GPIOLINE_FLAG_KERNEL            (1UL << 0)
  31 #define GPIOLINE_FLAG_IS_OUT            (1UL << 1)
  32 #define GPIOLINE_FLAG_ACTIVE_LOW        (1UL << 2)
  33 #define GPIOLINE_FLAG_OPEN_DRAIN        (1UL << 3)
  34 #define GPIOLINE_FLAG_OPEN_SOURCE       (1UL << 4)
  35
  36 /**
  37  * struct gpioline_info - Information about a certain GPIO line
  38  * @line_offset: the local offset on this GPIO device, fill this in when
  39  * requesting the line information from the kernel
  40  * @flags: various flags for this line
  41  * @name: the name of this GPIO line, such as the output pin of the line on the
  42  * chip, a rail or a pin header name on a board, as specified by the gpio
  43  * chip, may be NULL
  44  * @consumer: a functional name for the consumer of this GPIO line as set by
  45  * whatever is using it, will be NULL if there is no current user but may
  46  * also be NULL if the consumer doesn't set this up
  47  */
  48 struct gpioline_info {
  49         __u32 line_offset;
  50         __u32 flags;
  51         char name[32];
  52         char consumer[32];
  53 };
  54
  55 #define GPIO_GET_CHIPINFO_IOCTL _IOR(0xB4, 0x01, struct gpiochip_info)
  56 #define GPIO_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x02, struct gpioline_info)
  57
  58 #endif /* _UAPI_GPIO_H_ */