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 name of this GPIO chip
  19  * @label: a functional name for this GPIO chip
  20  * @lines: number of GPIO lines on this chip
  21  */
  22 struct gpiochip_info {
  23         char name[32];
  24         char label[32];
  25         __u32 lines;
  26 };
  27
  28 /* Line is in use by the kernel */
  29 #define GPIOLINE_FLAG_KERNEL            (1UL << 0)
  30 #define GPIOLINE_FLAG_IS_OUT            (1UL << 1)
  31 #define GPIOLINE_FLAG_ACTIVE_LOW        (1UL << 2)
  32 #define GPIOLINE_FLAG_OPEN_DRAIN        (1UL << 3)
  33 #define GPIOLINE_FLAG_OPEN_SOURCE       (1UL << 4)
  34
  35 /**
  36  * struct gpioline_info - Information about a certain GPIO line
  37  * @line_offset: the local offset on this GPIO device, fill in when
  38  * requesting information from the kernel
  39  * @flags: various flags for this line
  40  * @name: the name of this GPIO line
  41  * @label: a functional name for this GPIO line
  42  * @kernel: this GPIO is in use by the kernel
  43  * @out: this GPIO is an output line (false means it is an input)
  44  * @active_low: this GPIO is active low
  45  */
  46 struct gpioline_info {
  47         __u32 line_offset;
  48         __u32 flags;
  49         char name[32];
  50         char label[32];
  51 };
  52
  53 #define GPIO_GET_CHIPINFO_IOCTL _IOR('o', 0x01, struct gpiochip_info)
  54 #define GPIO_GET_LINEINFO_IOCTL _IOWR('o', 0x02, struct gpioline_info)
  55
  56 #endif /* _UAPI_GPIO_H_ */