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gpio: initial implementation of interupt handling on gpio

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-05-07 14:48:21 +01:00
parent 91e37a7982
commit 37b5d9f0cc
5 changed files with 243 additions and 11 deletions
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43
api/gpio.h
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@@ -35,15 +35,20 @@ extern "C" {
#endif
#include <stdio.h>
#include <pthread.h>
#include "maa.h"
/**
* A strucutre representing a gpio pin.
*/
typedef struct {
/*@{*/
int pin; /**< the pin number, as known to the os. */
FILE *value_fp; /**< the file pointer to the value of the gpio */
void (* isr)(); /**< the interupt service request */
pthread_t thread_id; /**< the isr handler thread id */
int isr_value_fp; /**< the isr file pointer on the value */
/*@}*/
} maa_gpio_context;
@@ -65,6 +70,13 @@ typedef enum {
MAA_GPIO_IN = 1 /**< Input. */
} gpio_dir_t;
typedef enum {
MAA_GPIO_EDGE_NONE = 0, /**< No interrupt on GPIO */
MAA_GPIO_EDGE_BOTH = 1, /**< Interupt on rising & falling */
MAA_GPIO_EDGE_RISING = 2, /**< Interupt on rising only */
MAA_GPIO_EDGE_FALLING = 3 /**< Interupt on falling only */
} gpio_edge_t;
/** Initialise gpio_context, based on board number
*
* @param pin pin number read from the board, i.e IO3 is 3.
@@ -82,6 +94,37 @@ maa_gpio_context* maa_gpio_init(int pin);
*/
maa_gpio_context* maa_gpio_init_raw(int gpiopin);
/** Set the edge mode on the gpio
*
* @param dev The GPIO context
* @param mode The edge mode to set the gpio into
*
* @return maa result type.
*/
maa_result_t maa_gpio_edge_mode(maa_gpio_context *dev, gpio_edge_t mode);
/** Set an interupt on pin
*
* @param dev The GPIO context
* @param mode The edge mode to set the gpio into
* @param fptr Function pointer to function to be called when interupt is
* triggered
*
* @return maa result type.
*/
maa_result_t
maa_gpio_isr(maa_gpio_context *dev, gpio_edge_t edge, void (*fptr)(void));
/** Stop the current interupt watcher on this GPIO, and set the GPIO edge mode
* to MAA_GPIO_EDGE_NONE.
*
* @param dev The GPIO context.
*
* @return maa result type.
*/
maa_result_t
maa_gpio_isr_exit(maa_gpio_context *dev);
/** Set GPIO Output Mode,
*
* @param dev The GPIO context