blob: 2e31e8b3a190bb652bb597104139d2f2b440d347 [file] [log] [blame]
David Brownell7560fa62008-03-04 14:28:27 -08001#ifndef __LINUX_GPIO_H
2#define __LINUX_GPIO_H
3
Mark Brown7563bbf2012-04-15 10:52:54 +01004#include <linux/errno.h>
5
David Brownell7560fa62008-03-04 14:28:27 -08006/* see Documentation/gpio.txt */
7
Randy Dunlapc001fb72011-06-14 17:05:11 -07008/* make these flag values available regardless of GPIO kconfig options */
9#define GPIOF_DIR_OUT (0 << 0)
10#define GPIOF_DIR_IN (1 << 0)
11
12#define GPIOF_INIT_LOW (0 << 1)
13#define GPIOF_INIT_HIGH (1 << 1)
14
15#define GPIOF_IN (GPIOF_DIR_IN)
16#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
17#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
18
Laxman Dewanganaca5ce12012-02-17 20:26:21 +053019/* Gpio pin is open drain */
20#define GPIOF_OPEN_DRAIN (1 << 2)
21
Laxman Dewangan25553ff2012-02-17 20:26:22 +053022/* Gpio pin is open source */
23#define GPIOF_OPEN_SOURCE (1 << 3)
24
Laxman Dewanganf567fde2012-06-20 14:14:05 +053025#define GPIOF_EXPORT (1 << 4)
26#define GPIOF_EXPORT_CHANGEABLE (1 << 5)
Wolfram Sangfc3a1f02011-12-13 18:34:01 +010027#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
28#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
29
Mark Brownfeb83692011-10-24 15:24:10 +020030/**
31 * struct gpio - a structure describing a GPIO with configuration
32 * @gpio: the GPIO number
33 * @flags: GPIO configuration as specified by GPIOF_*
34 * @label: a literal description string of this GPIO
35 */
36struct gpio {
37 unsigned gpio;
38 unsigned long flags;
39 const char *label;
40};
41
David Brownell7560fa62008-03-04 14:28:27 -080042#ifdef CONFIG_GENERIC_GPIO
Mark Brown7563bbf2012-04-15 10:52:54 +010043
44#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
David Brownell7560fa62008-03-04 14:28:27 -080045#include <asm/gpio.h>
Mark Brown7563bbf2012-04-15 10:52:54 +010046#else
47
48#include <asm-generic/gpio.h>
49
50static inline int gpio_get_value(unsigned int gpio)
51{
52 return __gpio_get_value(gpio);
53}
54
55static inline void gpio_set_value(unsigned int gpio, int value)
56{
57 __gpio_set_value(gpio, value);
58}
59
60static inline int gpio_cansleep(unsigned int gpio)
61{
62 return __gpio_cansleep(gpio);
63}
64
65static inline int gpio_to_irq(unsigned int gpio)
66{
67 return __gpio_to_irq(gpio);
68}
69
70static inline int irq_to_gpio(unsigned int irq)
71{
72 return -EINVAL;
73}
74
75#endif
David Brownell7560fa62008-03-04 14:28:27 -080076
77#else
78
Uwe Kleine-König3d599d12008-10-15 22:03:12 -070079#include <linux/kernel.h>
David Brownell6ea02052008-05-23 13:04:58 -070080#include <linux/types.h>
81#include <linux/errno.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050082#include <linux/bug.h>
David Brownell6ea02052008-05-23 13:04:58 -070083
Jani Nikulaa4177ee2009-09-22 16:46:33 -070084struct device;
Anton Vorontsov4e4438b2010-09-01 08:55:24 -060085struct gpio_chip;
Jani Nikulaa4177ee2009-09-22 16:46:33 -070086
Joe Perches3474cb32011-05-10 16:23:07 -070087static inline bool gpio_is_valid(int number)
David Brownell7560fa62008-03-04 14:28:27 -080088{
Joe Perches3474cb32011-05-10 16:23:07 -070089 return false;
David Brownell7560fa62008-03-04 14:28:27 -080090}
91
Linus Torvaldsd8a35152011-01-13 17:26:46 -080092static inline int gpio_request(unsigned gpio, const char *label)
David Brownell7560fa62008-03-04 14:28:27 -080093{
94 return -ENOSYS;
95}
96
Mark Brown2c969222012-04-04 16:14:48 +010097static inline int devm_gpio_request(struct device *dev, unsigned gpio,
98 const char *label)
99{
100 return -ENOSYS;
101}
102
Wolfram Sang323b7fe2011-01-14 09:34:29 +0100103static inline int gpio_request_one(unsigned gpio,
Wolfram Sang5f829e42011-01-12 17:00:24 -0800104 unsigned long flags, const char *label)
105{
106 return -ENOSYS;
107}
108
Mark Brown09d71ff2012-05-02 12:46:46 +0100109static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
110 unsigned long flags, const char *label)
111{
112 return -ENOSYS;
113}
114
Lars-Peter Clausen7c295972011-05-25 16:20:31 -0700115static inline int gpio_request_array(const struct gpio *array, size_t num)
Wolfram Sang5f829e42011-01-12 17:00:24 -0800116{
117 return -ENOSYS;
118}
119
David Brownell7560fa62008-03-04 14:28:27 -0800120static inline void gpio_free(unsigned gpio)
121{
Uwe Kleine-König3d599d12008-10-15 22:03:12 -0700122 might_sleep();
123
David Brownell7560fa62008-03-04 14:28:27 -0800124 /* GPIO can never have been requested */
125 WARN_ON(1);
126}
127
Mark Brown2c969222012-04-04 16:14:48 +0100128static inline void devm_gpio_free(struct device *dev, unsigned gpio)
129{
130 might_sleep();
131
132 /* GPIO can never have been requested */
133 WARN_ON(1);
134}
135
Lars-Peter Clausen7c295972011-05-25 16:20:31 -0700136static inline void gpio_free_array(const struct gpio *array, size_t num)
Wolfram Sang5f829e42011-01-12 17:00:24 -0800137{
138 might_sleep();
139
140 /* GPIO can never have been requested */
141 WARN_ON(1);
142}
143
Linus Torvaldsd8a35152011-01-13 17:26:46 -0800144static inline int gpio_direction_input(unsigned gpio)
David Brownell7560fa62008-03-04 14:28:27 -0800145{
146 return -ENOSYS;
147}
148
Linus Torvaldsd8a35152011-01-13 17:26:46 -0800149static inline int gpio_direction_output(unsigned gpio, int value)
David Brownell7560fa62008-03-04 14:28:27 -0800150{
151 return -ENOSYS;
152}
153
Felipe Balbic4b5be92010-05-26 14:42:23 -0700154static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
155{
156 return -ENOSYS;
157}
158
David Brownell7560fa62008-03-04 14:28:27 -0800159static inline int gpio_get_value(unsigned gpio)
160{
161 /* GPIO can never have been requested or set as {in,out}put */
162 WARN_ON(1);
163 return 0;
164}
165
166static inline void gpio_set_value(unsigned gpio, int value)
167{
168 /* GPIO can never have been requested or set as output */
169 WARN_ON(1);
170}
171
172static inline int gpio_cansleep(unsigned gpio)
173{
174 /* GPIO can never have been requested or set as {in,out}put */
175 WARN_ON(1);
176 return 0;
177}
178
179static inline int gpio_get_value_cansleep(unsigned gpio)
180{
181 /* GPIO can never have been requested or set as {in,out}put */
182 WARN_ON(1);
183 return 0;
184}
185
186static inline void gpio_set_value_cansleep(unsigned gpio, int value)
187{
188 /* GPIO can never have been requested or set as output */
189 WARN_ON(1);
190}
191
David Brownelld8f388d2008-07-25 01:46:07 -0700192static inline int gpio_export(unsigned gpio, bool direction_may_change)
193{
194 /* GPIO can never have been requested or set as {in,out}put */
195 WARN_ON(1);
196 return -EINVAL;
197}
198
Jani Nikulaa4177ee2009-09-22 16:46:33 -0700199static inline int gpio_export_link(struct device *dev, const char *name,
200 unsigned gpio)
201{
202 /* GPIO can never have been exported */
203 WARN_ON(1);
204 return -EINVAL;
205}
206
Jani Nikula07697462009-12-15 16:46:20 -0800207static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
208{
209 /* GPIO can never have been requested */
210 WARN_ON(1);
211 return -EINVAL;
212}
Jani Nikulaa4177ee2009-09-22 16:46:33 -0700213
David Brownelld8f388d2008-07-25 01:46:07 -0700214static inline void gpio_unexport(unsigned gpio)
215{
216 /* GPIO can never have been exported */
217 WARN_ON(1);
218}
219
David Brownell7560fa62008-03-04 14:28:27 -0800220static inline int gpio_to_irq(unsigned gpio)
221{
222 /* GPIO can never have been requested or set as input */
223 WARN_ON(1);
224 return -EINVAL;
225}
226
227static inline int irq_to_gpio(unsigned irq)
228{
229 /* irq can never have been returned from gpio_to_irq() */
230 WARN_ON(1);
231 return -EINVAL;
232}
233
234#endif
235
236#endif /* __LINUX_GPIO_H */