fs/btrfs: Fix build of ctree
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / gpio.h
blob32720baf70f1c8f1e46741ff8006d44da82f6188
1 #ifndef __LINUX_GPIO_H
2 #define __LINUX_GPIO_H
4 /* see Documentation/gpio.txt */
6 #ifdef CONFIG_GENERIC_GPIO
7 #include <asm/gpio.h>
9 #else
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/errno.h>
15 struct device;
16 struct gpio;
17 struct gpio_chip;
20 * Some platforms don't support the GPIO programming interface.
22 * In case some driver uses it anyway (it should normally have
23 * depended on GENERIC_GPIO), these routines help the compiler
24 * optimize out much GPIO-related code ... or trigger a runtime
25 * warning when something is wrongly called.
28 static inline int gpio_is_valid(int number)
30 return 0;
33 static inline int gpio_request(unsigned gpio, const char *label)
35 return -ENOSYS;
38 static inline int gpio_request_one(unsigned gpio,
39 unsigned long flags, const char *label)
41 return -ENOSYS;
44 static inline int gpio_request_array(struct gpio *array, size_t num)
46 return -ENOSYS;
49 static inline void gpio_free(unsigned gpio)
51 might_sleep();
53 /* GPIO can never have been requested */
54 WARN_ON(1);
57 static inline void gpio_free_array(struct gpio *array, size_t num)
59 might_sleep();
61 /* GPIO can never have been requested */
62 WARN_ON(1);
65 static inline int gpio_direction_input(unsigned gpio)
67 return -ENOSYS;
70 static inline int gpio_direction_output(unsigned gpio, int value)
72 return -ENOSYS;
75 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
77 return -ENOSYS;
80 static inline int gpio_get_value(unsigned gpio)
82 /* GPIO can never have been requested or set as {in,out}put */
83 WARN_ON(1);
84 return 0;
87 static inline void gpio_set_value(unsigned gpio, int value)
89 /* GPIO can never have been requested or set as output */
90 WARN_ON(1);
93 static inline int gpio_cansleep(unsigned gpio)
95 /* GPIO can never have been requested or set as {in,out}put */
96 WARN_ON(1);
97 return 0;
100 static inline int gpio_get_value_cansleep(unsigned gpio)
102 /* GPIO can never have been requested or set as {in,out}put */
103 WARN_ON(1);
104 return 0;
107 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
109 /* GPIO can never have been requested or set as output */
110 WARN_ON(1);
113 static inline int gpio_export(unsigned gpio, bool direction_may_change)
115 /* GPIO can never have been requested or set as {in,out}put */
116 WARN_ON(1);
117 return -EINVAL;
120 static inline int gpio_export_link(struct device *dev, const char *name,
121 unsigned gpio)
123 /* GPIO can never have been exported */
124 WARN_ON(1);
125 return -EINVAL;
128 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
130 /* GPIO can never have been requested */
131 WARN_ON(1);
132 return -EINVAL;
135 static inline void gpio_unexport(unsigned gpio)
137 /* GPIO can never have been exported */
138 WARN_ON(1);
141 static inline int gpio_to_irq(unsigned gpio)
143 /* GPIO can never have been requested or set as input */
144 WARN_ON(1);
145 return -EINVAL;
148 static inline int irq_to_gpio(unsigned irq)
150 /* irq can never have been returned from gpio_to_irq() */
151 WARN_ON(1);
152 return -EINVAL;
155 #endif
157 #endif /* __LINUX_GPIO_H */