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 /*
  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 */