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1 | #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 | |
11 | #include <linux/kernel.h> |
12 | #include <linux/types.h> |
13 | #include <linux/errno.h> |
14 | |
15 | struct device; |
16 | |
17 | /* |
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 | |
26 | static inline int gpio_is_valid(int number) |
27 | { |
28 | return 0; |
29 | } |
30 | |
31 | static inline int gpio_request(unsigned gpio, const char *label) |
32 | { |
33 | return -ENOSYS; |
34 | } |
35 | |
36 | static inline void gpio_free(unsigned gpio) |
37 | { |
38 | might_sleep(); |
39 | |
40 | /* GPIO can never have been requested */ |
41 | WARN_ON(1); |
42 | } |
43 | |
44 | static inline int gpio_direction_input(unsigned gpio) |
45 | { |
46 | return -ENOSYS; |
47 | } |
48 | |
49 | static inline int gpio_direction_output(unsigned gpio, int value) |
50 | { |
51 | return -ENOSYS; |
52 | } |
53 | |
54 | static 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 | |
61 | static 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 | |
67 | static 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 | |
74 | static 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 | |
81 | static 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 | |
87 | static 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 | |
94 | static 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 | |
102 | |
103 | static inline void gpio_unexport(unsigned gpio) |
104 | { |
105 | /* GPIO can never have been exported */ |
106 | WARN_ON(1); |
107 | } |
108 | |
109 | static inline int gpio_to_irq(unsigned gpio) |
110 | { |
111 | /* GPIO can never have been requested or set as input */ |
112 | WARN_ON(1); |
113 | return -EINVAL; |
114 | } |
115 | |
116 | static inline int irq_to_gpio(unsigned irq) |
117 | { |
118 | /* irq can never have been returned from gpio_to_irq() */ |
119 | WARN_ON(1); |
120 | return -EINVAL; |
121 | } |
122 | |
123 | #endif |
124 | |
125 | #endif /* __LINUX_GPIO_H */ |
126 |
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