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 /* Gpio pin is open drain */
  18 #define GPIOF_OPEN_DRAIN        (1 << 2)
  19
  20 /* Gpio pin is open source */
  21 #define GPIOF_OPEN_SOURCE       (1 << 3)
  22
  23 #define GPIOF_EXPORT            (1 << 2)
  24 #define GPIOF_EXPORT_CHANGEABLE (1 << 3)
  25 #define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
  26 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
  27
  28 /**
  29  * struct gpio - a structure describing a GPIO with configuration
  30  * @gpio:       the GPIO number
  31  * @flags:      GPIO configuration as specified by GPIOF_*
  32  * @label:      a literal description string of this GPIO
  33  */
  34 struct gpio {
  35         unsigned        gpio;
  36         unsigned long   flags;
  37         const char      *label;
  38 };
  39
  40 #ifdef CONFIG_GENERIC_GPIO
  41 #include <asm/gpio.h>
  42
  43 #else
  44
  45 #include <linux/kernel.h>
  46 #include <linux/types.h>
  47 #include <linux/errno.h>
  48 #include <linux/bug.h>
  49
  50 struct device;
  51 struct gpio_chip;
  52
  53 static inline bool gpio_is_valid(int number)
  54 {
  55         return false;
  56 }
  57
  58 static inline int gpio_request(unsigned gpio, const char *label)
  59 {
  60         return -ENOSYS;
  61 }
  62
  63 static inline int gpio_request_one(unsigned gpio,
  64                                         unsigned long flags, const char *label)
  65 {
  66         return -ENOSYS;
  67 }
  68
  69 static inline int gpio_request_array(const struct gpio *array, size_t num)
  70 {
  71         return -ENOSYS;
  72 }
  73
  74 static inline void gpio_free(unsigned gpio)
  75 {
  76         might_sleep();
  77
  78         /* GPIO can never have been requested */
  79         WARN_ON(1);
  80 }
  81
  82 static inline void gpio_free_array(const struct gpio *array, size_t num)
  83 {
  84         might_sleep();
  85
  86         /* GPIO can never have been requested */
  87         WARN_ON(1);
  88 }
  89
  90 static inline int gpio_direction_input(unsigned gpio)
  91 {
  92         return -ENOSYS;
  93 }
  94
  95 static inline int gpio_direction_output(unsigned gpio, int value)
  96 {
  97         return -ENOSYS;
  98 }
  99
 100 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
 101 {
 102         return -ENOSYS;
 103 }
 104
 105 static inline int gpio_get_value(unsigned gpio)
 106 {
 107         /* GPIO can never have been requested or set as {in,out}put */
 108         WARN_ON(1);
 109         return 0;
 110 }
 111
 112 static inline void gpio_set_value(unsigned gpio, int value)
 113 {
 114         /* GPIO can never have been requested or set as output */
 115         WARN_ON(1);
 116 }
 117
 118 static inline int gpio_cansleep(unsigned gpio)
 119 {
 120         /* GPIO can never have been requested or set as {in,out}put */
 121         WARN_ON(1);
 122         return 0;
 123 }
 124
 125 static inline int gpio_get_value_cansleep(unsigned gpio)
 126 {
 127         /* GPIO can never have been requested or set as {in,out}put */
 128         WARN_ON(1);
 129         return 0;
 130 }
 131
 132 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 133 {
 134         /* GPIO can never have been requested or set as output */
 135         WARN_ON(1);
 136 }
 137
 138 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 139 {
 140         /* GPIO can never have been requested or set as {in,out}put */
 141         WARN_ON(1);
 142         return -EINVAL;
 143 }
 144
 145 static inline int gpio_export_link(struct device *dev, const char *name,
 146                                 unsigned gpio)
 147 {
 148         /* GPIO can never have been exported */
 149         WARN_ON(1);
 150         return -EINVAL;
 151 }
 152
 153 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 154 {
 155         /* GPIO can never have been requested */
 156         WARN_ON(1);
 157         return -EINVAL;
 158 }
 159
 160 static inline void gpio_unexport(unsigned gpio)
 161 {
 162         /* GPIO can never have been exported */
 163         WARN_ON(1);
 164 }
 165
 166 static inline int gpio_to_irq(unsigned gpio)
 167 {
 168         /* GPIO can never have been requested or set as input */
 169         WARN_ON(1);
 170         return -EINVAL;
 171 }
 172
 173 static inline int irq_to_gpio(unsigned irq)
 174 {
 175         /* irq can never have been returned from gpio_to_irq() */
 176         WARN_ON(1);
 177         return -EINVAL;
 178 }
 179
 180 #endif
 181
 182 #endif /* __LINUX_GPIO_H */