include/linux/gpio.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * <linux/gpio.h>
   4  *
   5  * This is the LEGACY GPIO bulk include file, including legacy APIs. It is
   6  * used for GPIO drivers still referencing the global GPIO numberspace,
   7  * and should not be included in new code.
   8  *
   9  * If you're implementing a GPIO driver, only include <linux/gpio/driver.h>
  10  * If you're implementing a GPIO consumer, only include <linux/gpio/consumer.h>
  11  */
  12 #ifndef __LINUX_GPIO_H
  13 #define __LINUX_GPIO_H
  14
  15 #include <linux/errno.h>
  16
  17 /* see Documentation/driver-api/gpio/legacy.rst */
  18
  19 /* make these flag values available regardless of GPIO kconfig options */
  20 #define GPIOF_DIR_OUT   (0 << 0)
  21 #define GPIOF_DIR_IN    (1 << 0)
  22
  23 #define GPIOF_INIT_LOW  (0 << 1)
  24 #define GPIOF_INIT_HIGH (1 << 1)
  25
  26 #define GPIOF_IN                (GPIOF_DIR_IN)
  27 #define GPIOF_OUT_INIT_LOW      (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
  28 #define GPIOF_OUT_INIT_HIGH     (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
  29
  30 /* Gpio pin is active-low */
  31 #define GPIOF_ACTIVE_LOW        (1 << 2)
  32
  33 /* Gpio pin is open drain */
  34 #define GPIOF_OPEN_DRAIN        (1 << 3)
  35
  36 /* Gpio pin is open source */
  37 #define GPIOF_OPEN_SOURCE       (1 << 4)
  38
  39 #define GPIOF_EXPORT            (1 << 5)
  40 #define GPIOF_EXPORT_CHANGEABLE (1 << 6)
  41 #define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
  42 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
  43
  44 /**
  45  * struct gpio - a structure describing a GPIO with configuration
  46  * @gpio:       the GPIO number
  47  * @flags:      GPIO configuration as specified by GPIOF_*
  48  * @label:      a literal description string of this GPIO
  49  */
  50 struct gpio {
  51         unsigned        gpio;
  52         unsigned long   flags;
  53         const char      *label;
  54 };
  55
  56 #ifdef CONFIG_GPIOLIB
  57
  58 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
  59 #include <asm/gpio.h>
  60 #else
  61
  62 #include <asm-generic/gpio.h>
  63
  64 static inline int gpio_get_value(unsigned int gpio)
  65 {
  66         return __gpio_get_value(gpio);
  67 }
  68
  69 static inline void gpio_set_value(unsigned int gpio, int value)
  70 {
  71         __gpio_set_value(gpio, value);
  72 }
  73
  74 static inline int gpio_cansleep(unsigned int gpio)
  75 {
  76         return __gpio_cansleep(gpio);
  77 }
  78
  79 static inline int gpio_to_irq(unsigned int gpio)
  80 {
  81         return __gpio_to_irq(gpio);
  82 }
  83
  84 static inline int irq_to_gpio(unsigned int irq)
  85 {
  86         return -EINVAL;
  87 }
  88
  89 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
  90
  91 /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
  92
  93 struct device;
  94
  95 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
  96 int devm_gpio_request_one(struct device *dev, unsigned gpio,
  97                           unsigned long flags, const char *label);
  98 void devm_gpio_free(struct device *dev, unsigned int gpio);
  99
 100 #else /* ! CONFIG_GPIOLIB */
 101
 102 #include <linux/kernel.h>
 103 #include <linux/types.h>
 104 #include <linux/bug.h>
 105 #include <linux/pinctrl/pinctrl.h>
 106
 107 struct device;
 108 struct gpio_chip;
 109
 110 static inline bool gpio_is_valid(int number)
 111 {
 112         return false;
 113 }
 114
 115 static inline int gpio_request(unsigned gpio, const char *label)
 116 {
 117         return -ENOSYS;
 118 }
 119
 120 static inline int gpio_request_one(unsigned gpio,
 121                                         unsigned long flags, const char *label)
 122 {
 123         return -ENOSYS;
 124 }
 125
 126 static inline int gpio_request_array(const struct gpio *array, size_t num)
 127 {
 128         return -ENOSYS;
 129 }
 130
 131 static inline void gpio_free(unsigned gpio)
 132 {
 133         might_sleep();
 134
 135         /* GPIO can never have been requested */
 136         WARN_ON(1);
 137 }
 138
 139 static inline void gpio_free_array(const struct gpio *array, size_t num)
 140 {
 141         might_sleep();
 142
 143         /* GPIO can never have been requested */
 144         WARN_ON(1);
 145 }
 146
 147 static inline int gpio_direction_input(unsigned gpio)
 148 {
 149         return -ENOSYS;
 150 }
 151
 152 static inline int gpio_direction_output(unsigned gpio, int value)
 153 {
 154         return -ENOSYS;
 155 }
 156
 157 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
 158 {
 159         return -ENOSYS;
 160 }
 161
 162 static inline int gpio_get_value(unsigned gpio)
 163 {
 164         /* GPIO can never have been requested or set as {in,out}put */
 165         WARN_ON(1);
 166         return 0;
 167 }
 168
 169 static inline void gpio_set_value(unsigned gpio, int value)
 170 {
 171         /* GPIO can never have been requested or set as output */
 172         WARN_ON(1);
 173 }
 174
 175 static inline int gpio_cansleep(unsigned gpio)
 176 {
 177         /* GPIO can never have been requested or set as {in,out}put */
 178         WARN_ON(1);
 179         return 0;
 180 }
 181
 182 static inline int gpio_get_value_cansleep(unsigned gpio)
 183 {
 184         /* GPIO can never have been requested or set as {in,out}put */
 185         WARN_ON(1);
 186         return 0;
 187 }
 188
 189 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 190 {
 191         /* GPIO can never have been requested or set as output */
 192         WARN_ON(1);
 193 }
 194
 195 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 196 {
 197         /* GPIO can never have been requested or set as {in,out}put */
 198         WARN_ON(1);
 199         return -EINVAL;
 200 }
 201
 202 static inline int gpio_export_link(struct device *dev, const char *name,
 203                                 unsigned gpio)
 204 {
 205         /* GPIO can never have been exported */
 206         WARN_ON(1);
 207         return -EINVAL;
 208 }
 209
 210 static inline void gpio_unexport(unsigned gpio)
 211 {
 212         /* GPIO can never have been exported */
 213         WARN_ON(1);
 214 }
 215
 216 static inline int gpio_to_irq(unsigned gpio)
 217 {
 218         /* GPIO can never have been requested or set as input */
 219         WARN_ON(1);
 220         return -EINVAL;
 221 }
 222
 223 static inline int gpiochip_lock_as_irq(struct gpio_chip *chip,
 224                                        unsigned int offset)
 225 {
 226         WARN_ON(1);
 227         return -EINVAL;
 228 }
 229
 230 static inline void gpiochip_unlock_as_irq(struct gpio_chip *chip,
 231                                           unsigned int offset)
 232 {
 233         WARN_ON(1);
 234 }
 235
 236 static inline int irq_to_gpio(unsigned irq)
 237 {
 238         /* irq can never have been returned from gpio_to_irq() */
 239         WARN_ON(1);
 240         return -EINVAL;
 241 }
 242
 243 static inline int
 244 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 245                        unsigned int gpio_offset, unsigned int pin_offset,
 246                        unsigned int npins)
 247 {
 248         WARN_ON(1);
 249         return -EINVAL;
 250 }
 251
 252 static inline int
 253 gpiochip_add_pingroup_range(struct gpio_chip *chip,
 254                         struct pinctrl_dev *pctldev,
 255                         unsigned int gpio_offset, const char *pin_group)
 256 {
 257         WARN_ON(1);
 258         return -EINVAL;
 259 }
 260
 261 static inline void
 262 gpiochip_remove_pin_ranges(struct gpio_chip *chip)
 263 {
 264         WARN_ON(1);
 265 }
 266
 267 static inline int devm_gpio_request(struct device *dev, unsigned gpio,
 268                                     const char *label)
 269 {
 270         WARN_ON(1);
 271         return -EINVAL;
 272 }
 273
 274 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
 275                                         unsigned long flags, const char *label)
 276 {
 277         WARN_ON(1);
 278         return -EINVAL;
 279 }
 280
 281 static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
 282 {
 283         WARN_ON(1);
 284 }
 285
 286 #endif /* ! CONFIG_GPIOLIB */
 287
 288 #endif /* __LINUX_GPIO_H */