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 struct pinctrl_dev; 110 111 static inline bool gpio_is_valid(int number) 112 { 113 return false; 114 } 115 116 static inline int gpio_request(unsigned gpio, const char *label) 117 { 118 return -ENOSYS; 119 } 120 121 static inline int gpio_request_one(unsigned gpio, 122 unsigned long flags, const char *label) 123 { 124 return -ENOSYS; 125 } 126 127 static inline int gpio_request_array(const struct gpio *array, size_t num) 128 { 129 return -ENOSYS; 130 } 131 132 static inline void gpio_free(unsigned gpio) 133 { 134 might_sleep(); 135 136 /* GPIO can never have been requested */ 137 WARN_ON(1); 138 } 139 140 static inline void gpio_free_array(const struct gpio *array, size_t num) 141 { 142 might_sleep(); 143 144 /* GPIO can never have been requested */ 145 WARN_ON(1); 146 } 147 148 static inline int gpio_direction_input(unsigned gpio) 149 { 150 return -ENOSYS; 151 } 152 153 static inline int gpio_direction_output(unsigned gpio, int value) 154 { 155 return -ENOSYS; 156 } 157 158 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) 159 { 160 return -ENOSYS; 161 } 162 163 static inline int gpio_get_value(unsigned gpio) 164 { 165 /* GPIO can never have been requested or set as {in,out}put */ 166 WARN_ON(1); 167 return 0; 168 } 169 170 static inline void gpio_set_value(unsigned gpio, int value) 171 { 172 /* GPIO can never have been requested or set as output */ 173 WARN_ON(1); 174 } 175 176 static inline int gpio_cansleep(unsigned gpio) 177 { 178 /* GPIO can never have been requested or set as {in,out}put */ 179 WARN_ON(1); 180 return 0; 181 } 182 183 static inline int gpio_get_value_cansleep(unsigned gpio) 184 { 185 /* GPIO can never have been requested or set as {in,out}put */ 186 WARN_ON(1); 187 return 0; 188 } 189 190 static inline void gpio_set_value_cansleep(unsigned gpio, int value) 191 { 192 /* GPIO can never have been requested or set as output */ 193 WARN_ON(1); 194 } 195 196 static inline int gpio_export(unsigned gpio, bool direction_may_change) 197 { 198 /* GPIO can never have been requested or set as {in,out}put */ 199 WARN_ON(1); 200 return -EINVAL; 201 } 202 203 static inline int gpio_export_link(struct device *dev, const char *name, 204 unsigned gpio) 205 { 206 /* GPIO can never have been exported */ 207 WARN_ON(1); 208 return -EINVAL; 209 } 210 211 static inline void gpio_unexport(unsigned gpio) 212 { 213 /* GPIO can never have been exported */ 214 WARN_ON(1); 215 } 216 217 static inline int gpio_to_irq(unsigned gpio) 218 { 219 /* GPIO can never have been requested or set as input */ 220 WARN_ON(1); 221 return -EINVAL; 222 } 223 224 static inline int irq_to_gpio(unsigned irq) 225 { 226 /* irq can never have been returned from gpio_to_irq() */ 227 WARN_ON(1); 228 return -EINVAL; 229 } 230 231 static inline int devm_gpio_request(struct device *dev, unsigned gpio, 232 const char *label) 233 { 234 WARN_ON(1); 235 return -EINVAL; 236 } 237 238 static inline int devm_gpio_request_one(struct device *dev, unsigned gpio, 239 unsigned long flags, const char *label) 240 { 241 WARN_ON(1); 242 return -EINVAL; 243 } 244 245 static inline void devm_gpio_free(struct device *dev, unsigned int gpio) 246 { 247 WARN_ON(1); 248 } 249 250 #endif /* ! CONFIG_GPIOLIB */ 251 252 #endif /* __LINUX_GPIO_H */ 253