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 struct gpio_chip;
  17
  18 /*
  19  * Some platforms don't support the GPIO programming interface.
  20  *
  21  * In case some driver uses it anyway (it should normally have
  22  * depended on GENERIC_GPIO), these routines help the compiler
  23  * optimize out much GPIO-related code ... or trigger a runtime
  24  * warning when something is wrongly called.
  25  */
  26
  27 static inline int gpio_is_valid(int number)
  28 {
  29         return 0;
  30 }
  31
  32 static inline int gpio_request(unsigned gpio, const char *label)
  33 {
  34         return -ENOSYS;
  35 }
  36
  37 static inline void gpio_free(unsigned gpio)
  38 {
  39         might_sleep();
  40
  41         /* GPIO can never have been requested */
  42         WARN_ON(1);
  43 }
  44
  45 static inline int gpio_direction_input(unsigned gpio)
  46 {
  47         return -ENOSYS;
  48 }
  49
  50 static inline int gpio_direction_output(unsigned gpio, int value)
  51 {
  52         return -ENOSYS;
  53 }
  54
  55 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
  56 {
  57         return -ENOSYS;
  58 }
  59
  60 static inline int gpio_get_value(unsigned gpio)
  61 {
  62         /* GPIO can never have been requested or set as {in,out}put */
  63         WARN_ON(1);
  64         return 0;
  65 }
  66
  67 static inline void gpio_set_value(unsigned gpio, int value)
  68 {
  69         /* GPIO can never have been requested or set as output */
  70         WARN_ON(1);
  71 }
  72
  73 static inline int gpio_cansleep(unsigned gpio)
  74 {
  75         /* GPIO can never have been requested or set as {in,out}put */
  76         WARN_ON(1);
  77         return 0;
  78 }
  79
  80 static inline int gpio_get_value_cansleep(unsigned gpio)
  81 {
  82         /* GPIO can never have been requested or set as {in,out}put */
  83         WARN_ON(1);
  84         return 0;
  85 }
  86
  87 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
  88 {
  89         /* GPIO can never have been requested or set as output */
  90         WARN_ON(1);
  91 }
  92
  93 static inline int gpio_export(unsigned gpio, bool direction_may_change)
  94 {
  95         /* GPIO can never have been requested or set as {in,out}put */
  96         WARN_ON(1);
  97         return -EINVAL;
  98 }
  99
 100 static inline int gpio_export_link(struct device *dev, const char *name,
 101                                 unsigned gpio)
 102 {
 103         /* GPIO can never have been exported */
 104         WARN_ON(1);
 105         return -EINVAL;
 106 }
 107
 108 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 109 {
 110         /* GPIO can never have been requested */
 111         WARN_ON(1);
 112         return -EINVAL;
 113 }
 114
 115 static inline void gpio_unexport(unsigned gpio)
 116 {
 117         /* GPIO can never have been exported */
 118         WARN_ON(1);
 119 }
 120
 121 static inline int gpio_to_irq(unsigned gpio)
 122 {
 123         /* GPIO can never have been requested or set as input */
 124         WARN_ON(1);
 125         return -EINVAL;
 126 }
 127
 128 static inline int irq_to_gpio(unsigned irq)
 129 {
 130         /* irq can never have been returned from gpio_to_irq() */
 131         WARN_ON(1);
 132         return -EINVAL;
 133 }
 134
 135 #endif
 136
 137 #endif /* __LINUX_GPIO_H */