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/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 */