include/linux/gpio.h

   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/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14
  15 struct device;
  16
  17 /*
  18  * Some platforms don't support the GPIO programming interface.
  19  *
  20  * In case some driver uses it anyway (it should normally have
  21  * depended on GENERIC_GPIO), these routines help the compiler
  22  * optimize out much GPIO-related code ... or trigger a runtime
  23  * warning when something is wrongly called.
  24  */
  25
  26 static inline int gpio_is_valid(int number)
  27 {
  28         return 0;
  29 }
  30
  31 static inline int gpio_request(unsigned gpio, const char *label)
  32 {
  33         return -ENOSYS;
  34 }
  35
  36 static inline void gpio_free(unsigned gpio)
  37 {
  38         might_sleep();
  39
  40         /* GPIO can never have been requested */
  41         WARN_ON(1);
  42 }
  43
  44 static inline int gpio_direction_input(unsigned gpio)
  45 {
  46         return -ENOSYS;
  47 }
  48
  49 static inline int gpio_direction_output(unsigned gpio, int value)
  50 {
  51         return -ENOSYS;
  52 }
  53
  54 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
  55 {
  56         return -ENOSYS;
  57 }
  58
  59 static inline int gpio_get_value(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 void gpio_set_value(unsigned gpio, int value)
  67 {
  68         /* GPIO can never have been requested or set as output */
  69         WARN_ON(1);
  70 }
  71
  72 static inline int gpio_cansleep(unsigned gpio)
  73 {
  74         /* GPIO can never have been requested or set as {in,out}put */
  75         WARN_ON(1);
  76         return 0;
  77 }
  78
  79 static inline int gpio_get_value_cansleep(unsigned gpio)
  80 {
  81         /* GPIO can never have been requested or set as {in,out}put */
  82         WARN_ON(1);
  83         return 0;
  84 }
  85
  86 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
  87 {
  88         /* GPIO can never have been requested or set as output */
  89         WARN_ON(1);
  90 }
  91
  92 static inline int gpio_export(unsigned gpio, bool direction_may_change)
  93 {
  94         /* GPIO can never have been requested or set as {in,out}put */
  95         WARN_ON(1);
  96         return -EINVAL;
  97 }
  98
  99 static inline int gpio_export_link(struct device *dev, const char *name,
 100                                 unsigned gpio)
 101 {
 102         /* GPIO can never have been exported */
 103         WARN_ON(1);
 104         return -EINVAL;
 105 }
 106
 107 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 108 {
 109         /* GPIO can never have been requested */
 110         WARN_ON(1);
 111         return -EINVAL;
 112 }
 113
 114 static inline void gpio_unexport(unsigned gpio)
 115 {
 116         /* GPIO can never have been exported */
 117         WARN_ON(1);
 118 }
 119
 120 static inline int gpio_to_irq(unsigned gpio)
 121 {
 122         /* GPIO can never have been requested or set as input */
 123         WARN_ON(1);
 124         return -EINVAL;
 125 }
 126
 127 static inline int irq_to_gpio(unsigned irq)
 128 {
 129         /* irq can never have been returned from gpio_to_irq() */
 130         WARN_ON(1);
 131         return -EINVAL;
 132 }
 133
 134 #endif
 135
 136 #endif /* __LINUX_GPIO_H */