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 /* 12 * Some platforms don't support the GPIO programming interface. 13 * 14 * In case some driver uses it anyway (it should normally have 15 * depended on GENERIC_GPIO), these routines help the compiler 16 * optimize out much GPIO-related code ... or trigger a runtime 17 * warning when something is wrongly called. 18 */ 19 20 static inline int gpio_is_valid(int number) 21 { 22 return 0; 23 } 24 25 static inline int gpio_request(unsigned gpio, const char *label) 26 { 27 return -ENOSYS; 28 } 29 30 static inline void gpio_free(unsigned gpio) 31 { 32 /* GPIO can never have been requested */ 33 WARN_ON(1); 34 } 35 36 static inline int gpio_direction_input(unsigned gpio) 37 { 38 return -ENOSYS; 39 } 40 41 static inline int gpio_direction_output(unsigned gpio, int value) 42 { 43 return -ENOSYS; 44 } 45 46 static inline int gpio_get_value(unsigned gpio) 47 { 48 /* GPIO can never have been requested or set as {in,out}put */ 49 WARN_ON(1); 50 return 0; 51 } 52 53 static inline void gpio_set_value(unsigned gpio, int value) 54 { 55 /* GPIO can never have been requested or set as output */ 56 WARN_ON(1); 57 } 58 59 static inline int gpio_cansleep(unsigned gpio) 60 { 61 /* GPIO can never have been requested or set as {in,out}put */ 62 WARN_ON(1); 63 return 0; 64 } 65 66 static inline int gpio_get_value_cansleep(unsigned gpio) 67 { 68 /* GPIO can never have been requested or set as {in,out}put */ 69 WARN_ON(1); 70 return 0; 71 } 72 73 static inline void gpio_set_value_cansleep(unsigned gpio, int value) 74 { 75 /* GPIO can never have been requested or set as output */ 76 WARN_ON(1); 77 } 78 79 static inline int gpio_to_irq(unsigned gpio) 80 { 81 /* GPIO can never have been requested or set as input */ 82 WARN_ON(1); 83 return -EINVAL; 84 } 85 86 static inline int irq_to_gpio(unsigned irq) 87 { 88 /* irq can never have been returned from gpio_to_irq() */ 89 WARN_ON(1); 90 return -EINVAL; 91 } 92 93 #endif 94 95 #endif /* __LINUX_GPIO_H */ 96