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
  38 struct device;
  39 struct gpio_chip;
  40
  41 static inline bool gpio_is_valid(int number)
  42 {
  43         return false;
  44 }
  45
  46 static inline int gpio_request(unsigned gpio, const char *label)
  47 {
  48         return -ENOSYS;
  49 }
  50
  51 static inline int gpio_request_one(unsigned gpio,
  52                                         unsigned long flags, const char *label)
  53 {
  54         return -ENOSYS;
  55 }
  56
  57 static inline int gpio_request_array(const struct gpio *array, size_t num)
  58 {
  59         return -ENOSYS;
  60 }
  61
  62 static inline void gpio_free(unsigned gpio)
  63 {
  64         might_sleep();
  65
  66         /* GPIO can never have been requested */
  67         WARN_ON(1);
  68 }
  69
  70 static inline void gpio_free_array(const struct gpio *array, size_t num)
  71 {
  72         might_sleep();
  73
  74         /* GPIO can never have been requested */
  75         WARN_ON(1);
  76 }
  77
  78 static inline int gpio_direction_input(unsigned gpio)
  79 {
  80         return -ENOSYS;
  81 }
  82
  83 static inline int gpio_direction_output(unsigned gpio, int value)
  84 {
  85         return -ENOSYS;
  86 }
  87
  88 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
  89 {
  90         return -ENOSYS;
  91 }
  92
  93 static inline int gpio_get_value(unsigned gpio)
  94 {
  95         /* GPIO can never have been requested or set as {in,out}put */
  96         WARN_ON(1);
  97         return 0;
  98 }
  99
 100 static inline void gpio_set_value(unsigned gpio, int value)
 101 {
 102         /* GPIO can never have been requested or set as output */
 103         WARN_ON(1);
 104 }
 105
 106 static inline int gpio_cansleep(unsigned gpio)
 107 {
 108         /* GPIO can never have been requested or set as {in,out}put */
 109         WARN_ON(1);
 110         return 0;
 111 }
 112
 113 static inline int gpio_get_value_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 void gpio_set_value_cansleep(unsigned gpio, int value)
 121 {
 122         /* GPIO can never have been requested or set as output */
 123         WARN_ON(1);
 124 }
 125
 126 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 127 {
 128         /* GPIO can never have been requested or set as {in,out}put */
 129         WARN_ON(1);
 130         return -EINVAL;
 131 }
 132
 133 static inline int gpio_export_link(struct device *dev, const char *name,
 134                                 unsigned gpio)
 135 {
 136         /* GPIO can never have been exported */
 137         WARN_ON(1);
 138         return -EINVAL;
 139 }
 140
 141 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 142 {
 143         /* GPIO can never have been requested */
 144         WARN_ON(1);
 145         return -EINVAL;
 146 }
 147
 148 static inline void gpio_unexport(unsigned gpio)
 149 {
 150         /* GPIO can never have been exported */
 151         WARN_ON(1);
 152 }
 153
 154 static inline int gpio_to_irq(unsigned gpio)
 155 {
 156         /* GPIO can never have been requested or set as input */
 157         WARN_ON(1);
 158         return -EINVAL;
 159 }
 160
 161 static inline int irq_to_gpio(unsigned irq)
 162 {
 163         /* irq can never have been returned from gpio_to_irq() */
 164         WARN_ON(1);
 165         return -EINVAL;
 166 }
 167
 168 #endif
 169
 170 #endif /* __LINUX_GPIO_H */