1 #ifndef __LINUX_GPIO_H 2 #define __LINUX_GPIO_H 3 4 /* see Documentation/gpio.txt */ 5 6 #ifdef CONFIG_GENERIC_GPIO 7 #include <asm/gpio.h> 8 9 #else 10 11 #include <linux/types.h> 12 #include <linux/errno.h> 13 14 /* 15 * Some platforms don't support the GPIO programming interface. 16 * 17 * In case some driver uses it anyway (it should normally have 18 * depended on GENERIC_GPIO), these routines help the compiler 19 * optimize out much GPIO-related code ... or trigger a runtime 20 * warning when something is wrongly called. 21 */ 22 23 static inline int gpio_is_valid(int number) 24 { 25 return 0; 26 } 27 28 static inline int gpio_request(unsigned gpio, const char *label) 29 { 30 return -ENOSYS; 31 } 32 33 static inline void gpio_free(unsigned gpio) 34 { 35 /* GPIO can never have been requested */ 36 WARN_ON(1); 37 } 38 39 static inline int gpio_direction_input(unsigned gpio) 40 { 41 return -ENOSYS; 42 } 43 44 static inline int gpio_direction_output(unsigned gpio, int value) 45 { 46 return -ENOSYS; 47 } 48 49 static inline int gpio_get_value(unsigned gpio) 50 { 51 /* GPIO can never have been requested or set as {in,out}put */ 52 WARN_ON(1); 53 return 0; 54 } 55 56 static inline void gpio_set_value(unsigned gpio, int value) 57 { 58 /* GPIO can never have been requested or set as output */ 59 WARN_ON(1); 60 } 61 62 static inline int gpio_cansleep(unsigned gpio) 63 { 64 /* GPIO can never have been requested or set as {in,out}put */ 65 WARN_ON(1); 66 return 0; 67 } 68 69 static inline int gpio_get_value_cansleep(unsigned gpio) 70 { 71 /* GPIO can never have been requested or set as {in,out}put */ 72 WARN_ON(1); 73 return 0; 74 } 75 76 static inline void gpio_set_value_cansleep(unsigned gpio, int value) 77 { 78 /* GPIO can never have been requested or set as output */ 79 WARN_ON(1); 80 } 81 82 static inline int gpio_export(unsigned gpio, bool direction_may_change) 83 { 84 /* GPIO can never have been requested or set as {in,out}put */ 85 WARN_ON(1); 86 return -EINVAL; 87 } 88 89 static inline void gpio_unexport(unsigned gpio) 90 { 91 /* GPIO can never have been exported */ 92 WARN_ON(1); 93 } 94 95 static inline int gpio_to_irq(unsigned gpio) 96 { 97 /* GPIO can never have been requested or set as input */ 98 WARN_ON(1); 99 return -EINVAL; 100 } 101 102 static inline int irq_to_gpio(unsigned irq) 103 { 104 /* irq can never have been returned from gpio_to_irq() */ 105 WARN_ON(1); 106 return -EINVAL; 107 } 108 109 #endif 110 111 #endif /* __LINUX_GPIO_H */ 112