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/gpio-legacy.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 active-low */
  20 #define GPIOF_ACTIVE_LOW        (1 << 2)
  21
  22 /* Gpio pin is open drain */
  23 #define GPIOF_OPEN_DRAIN        (1 << 3)
  24
  25 /* Gpio pin is open source */
  26 #define GPIOF_OPEN_SOURCE       (1 << 4)
  27
  28 #define GPIOF_EXPORT            (1 << 5)
  29 #define GPIOF_EXPORT_CHANGEABLE (1 << 6)
  30 #define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
  31 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
  32
  33 /**
  34  * struct gpio - a structure describing a GPIO with configuration
  35  * @gpio:       the GPIO number
  36  * @flags:      GPIO configuration as specified by GPIOF_*
  37  * @label:      a literal description string of this GPIO
  38  */
  39 struct gpio {
  40         unsigned        gpio;
  41         unsigned long   flags;
  42         const char      *label;
  43 };
  44
  45 #ifdef CONFIG_GPIOLIB
  46
  47 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
  48 #include <asm/gpio.h>
  49 #else
  50
  51 #include <asm-generic/gpio.h>
  52
  53 static inline int gpio_get_value(unsigned int gpio)
  54 {
  55         return __gpio_get_value(gpio);
  56 }
  57
  58 static inline void gpio_set_value(unsigned int gpio, int value)
  59 {
  60         __gpio_set_value(gpio, value);
  61 }
  62
  63 static inline int gpio_cansleep(unsigned int gpio)
  64 {
  65         return __gpio_cansleep(gpio);
  66 }
  67
  68 static inline int gpio_to_irq(unsigned int gpio)
  69 {
  70         return __gpio_to_irq(gpio);
  71 }
  72
  73 static inline int irq_to_gpio(unsigned int irq)
  74 {
  75         return -EINVAL;
  76 }
  77
  78 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
  79
  80 /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
  81
  82 struct device;
  83
  84 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
  85 int devm_gpio_request_one(struct device *dev, unsigned gpio,
  86                           unsigned long flags, const char *label);
  87 void devm_gpio_free(struct device *dev, unsigned int gpio);
  88
  89 #else /* ! CONFIG_GPIOLIB */
  90
  91 #include <linux/kernel.h>
  92 #include <linux/types.h>
  93 #include <linux/bug.h>
  94 #include <linux/pinctrl/pinctrl.h>
  95
  96 struct device;
  97 struct gpio_chip;
  98
  99 static inline bool gpio_is_valid(int number)
 100 {
 101         return false;
 102 }
 103
 104 static inline int gpio_request(unsigned gpio, const char *label)
 105 {
 106         return -ENOSYS;
 107 }
 108
 109 static inline int gpio_request_one(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 gpio_free_array(const struct gpio *array, size_t num)
 129 {
 130         might_sleep();
 131
 132         /* GPIO can never have been requested */
 133         WARN_ON(1);
 134 }
 135
 136 static inline int gpio_direction_input(unsigned gpio)
 137 {
 138         return -ENOSYS;
 139 }
 140
 141 static inline int gpio_direction_output(unsigned gpio, int value)
 142 {
 143         return -ENOSYS;
 144 }
 145
 146 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
 147 {
 148         return -ENOSYS;
 149 }
 150
 151 static inline int gpio_get_value(unsigned gpio)
 152 {
 153         /* GPIO can never have been requested or set as {in,out}put */
 154         WARN_ON(1);
 155         return 0;
 156 }
 157
 158 static inline void gpio_set_value(unsigned gpio, int value)
 159 {
 160         /* GPIO can never have been requested or set as output */
 161         WARN_ON(1);
 162 }
 163
 164 static inline int gpio_cansleep(unsigned gpio)
 165 {
 166         /* GPIO can never have been requested or set as {in,out}put */
 167         WARN_ON(1);
 168         return 0;
 169 }
 170
 171 static inline int gpio_get_value_cansleep(unsigned gpio)
 172 {
 173         /* GPIO can never have been requested or set as {in,out}put */
 174         WARN_ON(1);
 175         return 0;
 176 }
 177
 178 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 179 {
 180         /* GPIO can never have been requested or set as output */
 181         WARN_ON(1);
 182 }
 183
 184 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 185 {
 186         /* GPIO can never have been requested or set as {in,out}put */
 187         WARN_ON(1);
 188         return -EINVAL;
 189 }
 190
 191 static inline int gpio_export_link(struct device *dev, const char *name,
 192                                 unsigned gpio)
 193 {
 194         /* GPIO can never have been exported */
 195         WARN_ON(1);
 196         return -EINVAL;
 197 }
 198
 199 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 200 {
 201         /* GPIO can never have been requested */
 202         WARN_ON(1);
 203         return -EINVAL;
 204 }
 205
 206 static inline void gpio_unexport(unsigned gpio)
 207 {
 208         /* GPIO can never have been exported */
 209         WARN_ON(1);
 210 }
 211
 212 static inline int gpio_to_irq(unsigned gpio)
 213 {
 214         /* GPIO can never have been requested or set as input */
 215         WARN_ON(1);
 216         return -EINVAL;
 217 }
 218
 219 static inline int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
 220 {
 221         WARN_ON(1);
 222         return -EINVAL;
 223 }
 224
 225 static inline void gpio_unlock_as_irq(struct gpio_chip *chip,
 226                                       unsigned int offset)
 227 {
 228         WARN_ON(1);
 229 }
 230
 231 static inline int irq_to_gpio(unsigned irq)
 232 {
 233         /* irq can never have been returned from gpio_to_irq() */
 234         WARN_ON(1);
 235         return -EINVAL;
 236 }
 237
 238 static inline int
 239 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 240                        unsigned int gpio_offset, unsigned int pin_offset,
 241                        unsigned int npins)
 242 {
 243         WARN_ON(1);
 244         return -EINVAL;
 245 }
 246
 247 static inline int
 248 gpiochip_add_pingroup_range(struct gpio_chip *chip,
 249                         struct pinctrl_dev *pctldev,
 250                         unsigned int gpio_offset, const char *pin_group)
 251 {
 252         WARN_ON(1);
 253         return -EINVAL;
 254 }
 255
 256 static inline void
 257 gpiochip_remove_pin_ranges(struct gpio_chip *chip)
 258 {
 259         WARN_ON(1);
 260 }
 261
 262 static inline int devm_gpio_request(struct device *dev, unsigned gpio,
 263                                     const char *label)
 264 {
 265         WARN_ON(1);
 266         return -EINVAL;
 267 }
 268
 269 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
 270                                         unsigned long flags, const char *label)
 271 {
 272         WARN_ON(1);
 273         return -EINVAL;
 274 }
 275
 276 static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
 277 {
 278         WARN_ON(1);
 279 }
 280
 281 #endif /* ! CONFIG_GPIOLIB */
 282
 283 #endif /* __LINUX_GPIO_H */