include/linux/gpio.h

   1 #ifndef __LINUX_GPIO_H
   2 #define __LINUX_GPIO_H
   3
   4 /* see Documentation/gpio.txt */
   5
   6 /* make these flag values available regardless of GPIO kconfig options */
   7 #define GPIOF_DIR_OUT   (0 << 0)
   8 #define GPIOF_DIR_IN    (1 << 0)
   9
  10 #define GPIOF_INIT_LOW  (0 << 1)
  11 #define GPIOF_INIT_HIGH (1 << 1)
  12
  13 #define GPIOF_IN                (GPIOF_DIR_IN)
  14 #define GPIOF_OUT_INIT_LOW      (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
  15 #define GPIOF_OUT_INIT_HIGH     (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
  16
  17 /**
  18  * struct gpio - a structure describing a GPIO with configuration
  19  * @gpio:       the GPIO number
  20  * @flags:      GPIO configuration as specified by GPIOF_*
  21  * @label:      a literal description string of this GPIO
  22  */
  23 struct gpio {
  24         unsigned        gpio;
  25         unsigned long   flags;
  26         const char      *label;
  27 };
  28
  29 #ifdef CONFIG_GENERIC_GPIO
  30 #include <asm/gpio.h>
  31
  32 #else
  33
  34 #include <linux/kernel.h>
  35 #include <linux/types.h>
  36 #include <linux/errno.h>
  37 #include <linux/bug.h>
  38
  39 struct device;
  40 struct gpio_chip;
  41
  42 static inline bool gpio_is_valid(int number)
  43 {
  44         return false;
  45 }
  46
  47 static inline int gpio_request(unsigned gpio, const char *label)
  48 {
  49         return -ENOSYS;
  50 }
  51
  52 static inline int gpio_request_one(unsigned gpio,
  53                                         unsigned long flags, const char *label)
  54 {
  55         return -ENOSYS;
  56 }
  57
  58 static inline int gpio_request_array(const struct gpio *array, size_t num)
  59 {
  60         return -ENOSYS;
  61 }
  62
  63 static inline void gpio_free(unsigned gpio)
  64 {
  65         might_sleep();
  66
  67         /* GPIO can never have been requested */
  68         WARN_ON(1);
  69 }
  70
  71 static inline void gpio_free_array(const struct gpio *array, size_t num)
  72 {
  73         might_sleep();
  74
  75         /* GPIO can never have been requested */
  76         WARN_ON(1);
  77 }
  78
  79 static inline int gpio_direction_input(unsigned gpio)
  80 {
  81         return -ENOSYS;
  82 }
  83
  84 static inline int gpio_direction_output(unsigned gpio, int value)
  85 {
  86         return -ENOSYS;
  87 }
  88
  89 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
  90 {
  91         return -ENOSYS;
  92 }
  93
  94 static inline int gpio_get_value(unsigned gpio)
  95 {
  96         /* GPIO can never have been requested or set as {in,out}put */
  97         WARN_ON(1);
  98         return 0;
  99 }
 100
 101 static inline void gpio_set_value(unsigned gpio, int value)
 102 {
 103         /* GPIO can never have been requested or set as output */
 104         WARN_ON(1);
 105 }
 106
 107 static inline int gpio_cansleep(unsigned gpio)
 108 {
 109         /* GPIO can never have been requested or set as {in,out}put */
 110         WARN_ON(1);
 111         return 0;
 112 }
 113
 114 static inline int gpio_get_value_cansleep(unsigned gpio)
 115 {
 116         /* GPIO can never have been requested or set as {in,out}put */
 117         WARN_ON(1);
 118         return 0;
 119 }
 120
 121 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 122 {
 123         /* GPIO can never have been requested or set as output */
 124         WARN_ON(1);
 125 }
 126
 127 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 128 {
 129         /* GPIO can never have been requested or set as {in,out}put */
 130         WARN_ON(1);
 131         return -EINVAL;
 132 }
 133
 134 static inline int gpio_export_link(struct device *dev, const char *name,
 135                                 unsigned gpio)
 136 {
 137         /* GPIO can never have been exported */
 138         WARN_ON(1);
 139         return -EINVAL;
 140 }
 141
 142 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 143 {
 144         /* GPIO can never have been requested */
 145         WARN_ON(1);
 146         return -EINVAL;
 147 }
 148
 149 static inline void gpio_unexport(unsigned gpio)
 150 {
 151         /* GPIO can never have been exported */
 152         WARN_ON(1);
 153 }
 154
 155 static inline int gpio_to_irq(unsigned gpio)
 156 {
 157         /* GPIO can never have been requested or set as input */
 158         WARN_ON(1);
 159         return -EINVAL;
 160 }
 161
 162 static inline int irq_to_gpio(unsigned irq)
 163 {
 164         /* irq can never have been returned from gpio_to_irq() */
 165         WARN_ON(1);
 166         return -EINVAL;
 167 }
 168
 169 #endif
 170
 171 #endif /* __LINUX_GPIO_H */