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 */