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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #ifndef __LINUX_GPIO_H #define __LINUX_GPIO_H /* see Documentation/gpio.txt */ #ifdef CONFIG_GENERIC_GPIO #include <asm/gpio.h> #else #include <linux/kernel.h> #include <linux/types.h> #include <linux/errno.h> struct device; /* * Some platforms don't support the GPIO programming interface. * * In case some driver uses it anyway (it should normally have * depended on GENERIC_GPIO), these routines help the compiler * optimize out much GPIO-related code ... or trigger a runtime * warning when something is wrongly called. */ static inline int gpio_is_valid(int number) { return 0; } static inline int gpio_request(unsigned gpio, const char *label) { return -ENOSYS; } static inline void gpio_free(unsigned gpio) { might_sleep(); /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpio_direction_input(unsigned gpio) { return -ENOSYS; } static inline int gpio_direction_output(unsigned gpio, int value) { return -ENOSYS; } static inline int gpio_get_value(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ WARN_ON(1); return 0; } static inline void gpio_set_value(unsigned gpio, int value) { /* GPIO can never have been requested or set as output */ WARN_ON(1); } static inline int gpio_cansleep(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ WARN_ON(1); return 0; } static inline int gpio_get_value_cansleep(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ WARN_ON(1); return 0; } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { /* GPIO can never have been requested or set as output */ WARN_ON(1); } static inline int gpio_export(unsigned gpio, bool direction_may_change) { /* GPIO can never have been requested or set as {in,out}put */ WARN_ON(1); return -EINVAL; } static inline int gpio_export_link(struct device *dev, const char *name, unsigned gpio) { /* GPIO can never have been exported */ WARN_ON(1); return -EINVAL; } static inline void gpio_unexport(unsigned gpio) { /* GPIO can never have been exported */ WARN_ON(1); } static inline int gpio_to_irq(unsigned gpio) { /* GPIO can never have been requested or set as input */ WARN_ON(1); return -EINVAL; } static inline int irq_to_gpio(unsigned irq) { /* irq can never have been returned from gpio_to_irq() */ WARN_ON(1); return -EINVAL; } #endif #endif /* __LINUX_GPIO_H */ |