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 #include <linux/bug.h> 38 39 struct device; 40 struct gpio_chip; 41 42 static inline bool gpio_is_valid(int number) 43 { 44 return false; 45 } 46 47 static inline int gpio_request(unsigned gpio, const char *label) 48 { 49 return -ENOSYS; 50 } 51 52 static inline int gpio_request_one(unsigned gpio, 53 unsigned long flags, const char *label) 54 { 55 return -ENOSYS; 56 } 57 58 static inline int gpio_request_array(const struct gpio *array, size_t num) 59 { 60 return -ENOSYS; 61 } 62 63 static inline void gpio_free(unsigned gpio) 64 { 65 might_sleep(); 66 67 /* GPIO can never have been requested */ 68 WARN_ON(1); 69 } 70 71 static inline void gpio_free_array(const struct gpio *array, size_t num) 72 { 73 might_sleep(); 74 75 /* GPIO can never have been requested */ 76 WARN_ON(1); 77 } 78 79 static inline int gpio_direction_input(unsigned gpio) 80 { 81 return -ENOSYS; 82 } 83 84 static inline int gpio_direction_output(unsigned gpio, int value) 85 { 86 return -ENOSYS; 87 } 88 89 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) 90 { 91 return -ENOSYS; 92 } 93 94 static inline int gpio_get_value(unsigned gpio) 95 { 96 /* GPIO can never have been requested or set as {in,out}put */ 97 WARN_ON(1); 98 return 0; 99 } 100 101 static inline void gpio_set_value(unsigned gpio, int value) 102 { 103 /* GPIO can never have been requested or set as output */ 104 WARN_ON(1); 105 } 106 107 static inline int gpio_cansleep(unsigned gpio) 108 { 109 /* GPIO can never have been requested or set as {in,out}put */ 110 WARN_ON(1); 111 return 0; 112 } 113 114 static inline int gpio_get_value_cansleep(unsigned gpio) 115 { 116 /* GPIO can never have been requested or set as {in,out}put */ 117 WARN_ON(1); 118 return 0; 119 } 120 121 static inline void gpio_set_value_cansleep(unsigned gpio, int value) 122 { 123 /* GPIO can never have been requested or set as output */ 124 WARN_ON(1); 125 } 126 127 static inline int gpio_export(unsigned gpio, bool direction_may_change) 128 { 129 /* GPIO can never have been requested or set as {in,out}put */ 130 WARN_ON(1); 131 return -EINVAL; 132 } 133 134 static inline int gpio_export_link(struct device *dev, const char *name, 135 unsigned gpio) 136 { 137 /* GPIO can never have been exported */ 138 WARN_ON(1); 139 return -EINVAL; 140 } 141 142 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) 143 { 144 /* GPIO can never have been requested */ 145 WARN_ON(1); 146 return -EINVAL; 147 } 148 149 static inline void gpio_unexport(unsigned gpio) 150 { 151 /* GPIO can never have been exported */ 152 WARN_ON(1); 153 } 154 155 static inline int gpio_to_irq(unsigned gpio) 156 { 157 /* GPIO can never have been requested or set as input */ 158 WARN_ON(1); 159 return -EINVAL; 160 } 161 162 static inline int irq_to_gpio(unsigned irq) 163 { 164 /* irq can never have been returned from gpio_to_irq() */ 165 WARN_ON(1); 166 return -EINVAL; 167 } 168 169 #endif 170 171 #endif /* __LINUX_GPIO_H */ 172