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