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_get_value(unsigned gpio)
  55 {
  56         /* GPIO can never have been requested or set as {in,out}put */
  57         WARN_ON(1);
  58         return 0;
  59 }
  60
  61 static inline void gpio_set_value(unsigned gpio, int value)
  62 {
  63         /* GPIO can never have been requested or set as output */
  64         WARN_ON(1);
  65 }
  66
  67 static inline int gpio_cansleep(unsigned gpio)
  68 {
  69         /* GPIO can never have been requested or set as {in,out}put */
  70         WARN_ON(1);
  71         return 0;
  72 }
  73
  74 static inline int gpio_get_value_cansleep(unsigned gpio)
  75 {
  76         /* GPIO can never have been requested or set as {in,out}put */
  77         WARN_ON(1);
  78         return 0;
  79 }
  80
  81 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
  82 {
  83         /* GPIO can never have been requested or set as output */
  84         WARN_ON(1);
  85 }
  86
  87 static inline int gpio_export(unsigned gpio, bool direction_may_change)
  88 {
  89         /* GPIO can never have been requested or set as {in,out}put */
  90         WARN_ON(1);
  91         return -EINVAL;
  92 }
  93
  94 static inline int gpio_export_link(struct device *dev, const char *name,
  95                                 unsigned gpio)
  96 {
  97         /* GPIO can never have been exported */
  98         WARN_ON(1);
  99         return -EINVAL;
 100 }
 101
 102
 103 static inline void gpio_unexport(unsigned gpio)
 104 {
 105         /* GPIO can never have been exported */
 106         WARN_ON(1);
 107 }
 108
 109 static inline int gpio_to_irq(unsigned gpio)
 110 {
 111         /* GPIO can never have been requested or set as input */
 112         WARN_ON(1);
 113         return -EINVAL;
 114 }
 115
 116 static inline int irq_to_gpio(unsigned irq)
 117 {
 118         /* irq can never have been returned from gpio_to_irq() */
 119         WARN_ON(1);
 120         return -EINVAL;
 121 }
 122
 123 #endif
 124
 125 #endif /* __LINUX_GPIO_H */