1 /* $OpenBSD: gpio.h,v 1.1 2004/06/03 18:08:00 grange Exp $ */
2 /*
3 * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #ifndef _SYS_GPIO_H_
19 #define _SYS_GPIO_H_
20
21 /* GPIO pin states */
22 #define GPIO_PIN_LOW 0x00 /* low level (logical 0) */
23 #define GPIO_PIN_HIGH 0x01 /* high level (logical 1) */
24
25 /* GPIO pin configuration flags */
26 #define GPIO_PIN_INPUT 0x0001 /* input direction */
27 #define GPIO_PIN_OUTPUT 0x0002 /* output direction */
28 #define GPIO_PIN_INOUT 0x0004 /* bi-directional */
29 #define GPIO_PIN_OPENDRAIN 0x0008 /* open-drain output */
30 #define GPIO_PIN_PUSHPULL 0x0010 /* push-pull output */
31 #define GPIO_PIN_TRISTATE 0x0020 /* output disabled */
32 #define GPIO_PIN_PULLUP 0x0040 /* internal pull-up enabled */
33
34 /* GPIO controller description */
35 struct gpio_info {
36 int gpio_npins; /* total number of pins available */
37 };
38
39 /* GPIO pin operation (read/write/toggle) */
40 struct gpio_pin_op {
41 int gp_pin; /* pin number */
42 int gp_value; /* value */
43 };
44
45 /* GPIO pin control */
46 struct gpio_pin_ctl {
47 int gp_pin; /* pin number */
48 int gp_caps; /* pin capabilities (read-only) */
49 int gp_flags; /* pin configuration flags */
50 };
51
52 #define GPIOINFO _IOR('G', 0, struct gpio_info)
53 #define GPIOPINREAD _IOWR('G', 1, struct gpio_pin_op)
54 #define GPIOPINWRITE _IOWR('G', 2, struct gpio_pin_op)
55 #define GPIOPINTOGGLE _IOWR('G', 3, struct gpio_pin_op)
56 #define GPIOPINCTL _IOWR('G', 4, struct gpio_pin_ctl)
57
58 #endif /* !_SYS_GPIO_H_ */