FreeBSD/Linux Kernel Cross Reference
sys/sys/gpio.h

     /* $NetBSD: gpio.h,v 1.3 2008/01/09 15:11:30 xtraeme Exp $ */
     /*      $OpenBSD: gpio.h,v 1.1 2004/06/03 18:08:00 grange Exp $ */
     /*
      * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
      *
      * Permission to use, copy, modify, and distribute this software for any
      * purpose with or without fee is hereby granted, provided that the above
      * copyright notice and this permission notice appear in all copies.
      *
     * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #ifndef _SYS_GPIO_H_
    #define _SYS_GPIO_H_
    
    /* GPIO pin states */
    #define GPIO_PIN_LOW            0x00    /* low level (logical 0) */
    #define GPIO_PIN_HIGH           0x01    /* high level (logical 1) */
    
    /* GPIO pin configuration flags */
    #define GPIO_PIN_INPUT          0x0001  /* input direction */
    #define GPIO_PIN_OUTPUT         0x0002  /* output direction */
    #define GPIO_PIN_INOUT          0x0004  /* bi-directional */
    #define GPIO_PIN_OPENDRAIN      0x0008  /* open-drain output */
    #define GPIO_PIN_PUSHPULL       0x0010  /* push-pull output */
    #define GPIO_PIN_TRISTATE       0x0020  /* output disabled */
    #define GPIO_PIN_PULLUP         0x0040  /* internal pull-up enabled */
    #define GPIO_PIN_PULLDOWN       0x0080  /* internal pull-down enabled */
    #define GPIO_PIN_INVIN          0x0100  /* invert input */
    #define GPIO_PIN_INVOUT         0x0200  /* invert output */
    
    /* GPIO controller description */
    struct gpio_info {
            int gpio_npins;         /* total number of pins available */
    };
    
    /* GPIO pin operation (read/write/toggle) */
    struct gpio_pin_op {
            int gp_pin;             /* pin number */
            int gp_value;           /* value */
    };
    
    /* GPIO pin control */
    struct gpio_pin_ctl {
            int gp_pin;             /* pin number */
            int gp_caps;            /* pin capabilities (read-only) */
            int gp_flags;           /* pin configuration flags */
    };
    
    #define GPIOINFO                _IOR('G', 0, struct gpio_info)
    #define GPIOPINREAD             _IOWR('G', 1, struct gpio_pin_op)
    #define GPIOPINWRITE            _IOWR('G', 2, struct gpio_pin_op)
    #define GPIOPINTOGGLE           _IOWR('G', 3, struct gpio_pin_op)
    #define GPIOPINCTL              _IOWR('G', 4, struct gpio_pin_ctl)
    
    #endif  /* !_SYS_GPIO_H_ */

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