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 /*
  16  * Some platforms don't support the GPIO programming interface.
  17  *
  18  * In case some driver uses it anyway (it should normally have
  19  * depended on GENERIC_GPIO), these routines help the compiler
  20  * optimize out much GPIO-related code ... or trigger a runtime
  21  * warning when something is wrongly called.
  22  */
  23
  24 static inline int gpio_is_valid(int number)
  25 {
  26         return 0;
  27 }
  28
  29 static inline int gpio_request(unsigned gpio, const char *label)
  30 {
  31         return -ENOSYS;
  32 }
  33
  34 static inline void gpio_free(unsigned gpio)
  35 {
  36         might_sleep();
  37
  38         /* GPIO can never have been requested */
  39         WARN_ON(1);
  40 }
  41
  42 static inline int gpio_direction_input(unsigned gpio)
  43 {
  44         return -ENOSYS;
  45 }
  46
  47 static inline int gpio_direction_output(unsigned gpio, int value)
  48 {
  49         return -ENOSYS;
  50 }
  51
  52 static inline int gpio_get_value(unsigned gpio)
  53 {
  54         /* GPIO can never have been requested or set as {in,out}put */
  55         WARN_ON(1);
  56         return 0;
  57 }
  58
  59 static inline void gpio_set_value(unsigned gpio, int value)
  60 {
  61         /* GPIO can never have been requested or set as output */
  62         WARN_ON(1);
  63 }
  64
  65 static inline int gpio_cansleep(unsigned gpio)
  66 {
  67         /* GPIO can never have been requested or set as {in,out}put */
  68         WARN_ON(1);
  69         return 0;
  70 }
  71
  72 static inline int gpio_get_value_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 void gpio_set_value_cansleep(unsigned gpio, int value)
  80 {
  81         /* GPIO can never have been requested or set as output */
  82         WARN_ON(1);
  83 }
  84
  85 static inline int gpio_export(unsigned gpio, bool direction_may_change)
  86 {
  87         /* GPIO can never have been requested or set as {in,out}put */
  88         WARN_ON(1);
  89         return -EINVAL;
  90 }
  91
  92 static inline void gpio_unexport(unsigned gpio)
  93 {
  94         /* GPIO can never have been exported */
  95         WARN_ON(1);
  96 }
  97
  98 static inline int gpio_to_irq(unsigned gpio)
  99 {
 100         /* GPIO can never have been requested or set as input */
 101         WARN_ON(1);
 102         return -EINVAL;
 103 }
 104
 105 static inline int irq_to_gpio(unsigned irq)
 106 {
 107         /* irq can never have been returned from gpio_to_irq() */
 108         WARN_ON(1);
 109         return -EINVAL;
 110 }
 111
 112 #endif
 113
 114 #endif /* __LINUX_GPIO_H */