include/linux/gpio.h

   1 #ifndef __LINUX_GPIO_H
   2 #define __LINUX_GPIO_H
   3
   4 #include <linux/errno.h>
   5
   6 /* see Documentation/gpio.txt */
   7
   8 /* make these flag values available regardless of GPIO kconfig options */
   9 #define GPIOF_DIR_OUT   (0 << 0)
  10 #define GPIOF_DIR_IN    (1 << 0)
  11
  12 #define GPIOF_INIT_LOW  (0 << 1)
  13 #define GPIOF_INIT_HIGH (1 << 1)
  14
  15 #define GPIOF_IN                (GPIOF_DIR_IN)
  16 #define GPIOF_OUT_INIT_LOW      (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
  17 #define GPIOF_OUT_INIT_HIGH     (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
  18
  19 /* Gpio pin is open drain */
  20 #define GPIOF_OPEN_DRAIN        (1 << 2)
  21
  22 /* Gpio pin is open source */
  23 #define GPIOF_OPEN_SOURCE       (1 << 3)
  24
  25 #define GPIOF_EXPORT            (1 << 4)
  26 #define GPIOF_EXPORT_CHANGEABLE (1 << 5)
  27 #define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
  28 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
  29
  30 /**
  31  * struct gpio - a structure describing a GPIO with configuration
  32  * @gpio:       the GPIO number
  33  * @flags:      GPIO configuration as specified by GPIOF_*
  34  * @label:      a literal description string of this GPIO
  35  */
  36 struct gpio {
  37         unsigned        gpio;
  38         unsigned long   flags;
  39         const char      *label;
  40 };
  41
  42 #ifdef CONFIG_GENERIC_GPIO
  43
  44 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
  45 #include <asm/gpio.h>
  46 #else
  47
  48 #include <asm-generic/gpio.h>
  49
  50 static inline int gpio_get_value(unsigned int gpio)
  51 {
  52         return __gpio_get_value(gpio);
  53 }
  54
  55 static inline void gpio_set_value(unsigned int gpio, int value)
  56 {
  57         __gpio_set_value(gpio, value);
  58 }
  59
  60 static inline int gpio_cansleep(unsigned int gpio)
  61 {
  62         return __gpio_cansleep(gpio);
  63 }
  64
  65 static inline int gpio_to_irq(unsigned int gpio)
  66 {
  67         return __gpio_to_irq(gpio);
  68 }
  69
  70 static inline int irq_to_gpio(unsigned int irq)
  71 {
  72         return -EINVAL;
  73 }
  74
  75 #endif
  76
  77 #else
  78
  79 #include <linux/kernel.h>
  80 #include <linux/types.h>
  81 #include <linux/errno.h>
  82 #include <linux/bug.h>
  83
  84 struct device;
  85 struct gpio_chip;
  86
  87 static inline bool gpio_is_valid(int number)
  88 {
  89         return false;
  90 }
  91
  92 static inline int gpio_request(unsigned gpio, const char *label)
  93 {
  94         return -ENOSYS;
  95 }
  96
  97 static inline int devm_gpio_request(struct device *dev, unsigned gpio,
  98                                     const char *label)
  99 {
 100         return -ENOSYS;
 101 }
 102
 103 static inline int gpio_request_one(unsigned gpio,
 104                                         unsigned long flags, const char *label)
 105 {
 106         return -ENOSYS;
 107 }
 108
 109 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
 110                                         unsigned long flags, const char *label)
 111 {
 112         return -ENOSYS;
 113 }
 114
 115 static inline int gpio_request_array(const struct gpio *array, size_t num)
 116 {
 117         return -ENOSYS;
 118 }
 119
 120 static inline void gpio_free(unsigned gpio)
 121 {
 122         might_sleep();
 123
 124         /* GPIO can never have been requested */
 125         WARN_ON(1);
 126 }
 127
 128 static inline void devm_gpio_free(struct device *dev, unsigned gpio)
 129 {
 130         might_sleep();
 131
 132         /* GPIO can never have been requested */
 133         WARN_ON(1);
 134 }
 135
 136 static inline void gpio_free_array(const struct gpio *array, size_t num)
 137 {
 138         might_sleep();
 139
 140         /* GPIO can never have been requested */
 141         WARN_ON(1);
 142 }
 143
 144 static inline int gpio_direction_input(unsigned gpio)
 145 {
 146         return -ENOSYS;
 147 }
 148
 149 static inline int gpio_direction_output(unsigned gpio, int value)
 150 {
 151         return -ENOSYS;
 152 }
 153
 154 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
 155 {
 156         return -ENOSYS;
 157 }
 158
 159 static inline int gpio_get_value(unsigned gpio)
 160 {
 161         /* GPIO can never have been requested or set as {in,out}put */
 162         WARN_ON(1);
 163         return 0;
 164 }
 165
 166 static inline void gpio_set_value(unsigned gpio, int value)
 167 {
 168         /* GPIO can never have been requested or set as output */
 169         WARN_ON(1);
 170 }
 171
 172 static inline int gpio_cansleep(unsigned gpio)
 173 {
 174         /* GPIO can never have been requested or set as {in,out}put */
 175         WARN_ON(1);
 176         return 0;
 177 }
 178
 179 static inline int gpio_get_value_cansleep(unsigned gpio)
 180 {
 181         /* GPIO can never have been requested or set as {in,out}put */
 182         WARN_ON(1);
 183         return 0;
 184 }
 185
 186 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 187 {
 188         /* GPIO can never have been requested or set as output */
 189         WARN_ON(1);
 190 }
 191
 192 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 193 {
 194         /* GPIO can never have been requested or set as {in,out}put */
 195         WARN_ON(1);
 196         return -EINVAL;
 197 }
 198
 199 static inline int gpio_export_link(struct device *dev, const char *name,
 200                                 unsigned gpio)
 201 {
 202         /* GPIO can never have been exported */
 203         WARN_ON(1);
 204         return -EINVAL;
 205 }
 206
 207 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 208 {
 209         /* GPIO can never have been requested */
 210         WARN_ON(1);
 211         return -EINVAL;
 212 }
 213
 214 static inline void gpio_unexport(unsigned gpio)
 215 {
 216         /* GPIO can never have been exported */
 217         WARN_ON(1);
 218 }
 219
 220 static inline int gpio_to_irq(unsigned gpio)
 221 {
 222         /* GPIO can never have been requested or set as input */
 223         WARN_ON(1);
 224         return -EINVAL;
 225 }
 226
 227 static inline int irq_to_gpio(unsigned irq)
 228 {
 229         /* irq can never have been returned from gpio_to_irq() */
 230         WARN_ON(1);
 231         return -EINVAL;
 232 }
 233
 234 #endif
 235
 236 #endif /* __LINUX_GPIO_H */