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David Brownell7560fa62008-03-04 14:28:27 -08001#ifndef __LINUX_GPIO_H
2#define __LINUX_GPIO_H
3
4/* see Documentation/gpio.txt */
5
6#ifdef CONFIG_GENERIC_GPIO
7#include <asm/gpio.h>
8
9#else
10
Uwe Kleine-König3d599d12008-10-15 22:03:12 -070011#include <linux/kernel.h>
David Brownell6ea02052008-05-23 13:04:58 -070012#include <linux/types.h>
13#include <linux/errno.h>
14
Jani Nikulaa4177ee2009-09-22 16:46:33 -070015struct device;
16
David Brownell7560fa62008-03-04 14:28:27 -080017/*
18 * Some platforms don't support the GPIO programming interface.
19 *
20 * In case some driver uses it anyway (it should normally have
21 * depended on GENERIC_GPIO), these routines help the compiler
22 * optimize out much GPIO-related code ... or trigger a runtime
23 * warning when something is wrongly called.
24 */
25
26static inline int gpio_is_valid(int number)
27{
28 return 0;
29}
30
31static inline int gpio_request(unsigned gpio, const char *label)
32{
33 return -ENOSYS;
34}
35
36static inline void gpio_free(unsigned gpio)
37{
Uwe Kleine-König3d599d12008-10-15 22:03:12 -070038 might_sleep();
39
David Brownell7560fa62008-03-04 14:28:27 -080040 /* GPIO can never have been requested */
41 WARN_ON(1);
42}
43
44static inline int gpio_direction_input(unsigned gpio)
45{
46 return -ENOSYS;
47}
48
49static inline int gpio_direction_output(unsigned gpio, int value)
50{
51 return -ENOSYS;
52}
53
54static inline int gpio_get_value(unsigned gpio)
55{
56 /* GPIO can never have been requested or set as {in,out}put */
57 WARN_ON(1);
58 return 0;
59}
60
61static inline void gpio_set_value(unsigned gpio, int value)
62{
63 /* GPIO can never have been requested or set as output */
64 WARN_ON(1);
65}
66
67static inline int gpio_cansleep(unsigned gpio)
68{
69 /* GPIO can never have been requested or set as {in,out}put */
70 WARN_ON(1);
71 return 0;
72}
73
74static inline int gpio_get_value_cansleep(unsigned gpio)
75{
76 /* GPIO can never have been requested or set as {in,out}put */
77 WARN_ON(1);
78 return 0;
79}
80
81static inline void gpio_set_value_cansleep(unsigned gpio, int value)
82{
83 /* GPIO can never have been requested or set as output */
84 WARN_ON(1);
85}
86
David Brownelld8f388d2008-07-25 01:46:07 -070087static inline int gpio_export(unsigned gpio, bool direction_may_change)
88{
89 /* GPIO can never have been requested or set as {in,out}put */
90 WARN_ON(1);
91 return -EINVAL;
92}
93
Jani Nikulaa4177ee2009-09-22 16:46:33 -070094static inline int gpio_export_link(struct device *dev, const char *name,
95 unsigned gpio)
96{
97 /* GPIO can never have been exported */
98 WARN_ON(1);
99 return -EINVAL;
100}
101
Jani Nikula07697462009-12-15 16:46:20 -0800102static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
103{
104 /* GPIO can never have been requested */
105 WARN_ON(1);
106 return -EINVAL;
107}
Jani Nikulaa4177ee2009-09-22 16:46:33 -0700108
David Brownelld8f388d2008-07-25 01:46:07 -0700109static inline void gpio_unexport(unsigned gpio)
110{
111 /* GPIO can never have been exported */
112 WARN_ON(1);
113}
114
David Brownell7560fa62008-03-04 14:28:27 -0800115static inline int gpio_to_irq(unsigned gpio)
116{
117 /* GPIO can never have been requested or set as input */
118 WARN_ON(1);
119 return -EINVAL;
120}
121
122static inline int irq_to_gpio(unsigned irq)
123{
124 /* irq can never have been returned from gpio_to_irq() */
125 WARN_ON(1);
126 return -EINVAL;
127}
128
129#endif
130
131#endif /* __LINUX_GPIO_H */