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gpio: Matured the GPIO API.

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* Greater use of return values.
* Uses defined enum instead of char arrays

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-04-29 16:46:10 +01:00
parent 6ad98d23e7
commit 226c6bcb66
2 changed files with 121 additions and 24 deletions
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52
src/gpio/gpio.c
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@@ -43,12 +43,20 @@ maa_gpio_get_valfp(maa_gpio_context *dev)
maa_gpio_context*
maa_gpio_init(int pin)
{
//TODO
return NULL;
}
maa_gpio_context*
maa_gpio_init_raw(int pin)
{
FILE *export_f;
maa_gpio_context* dev = (maa_gpio_context*) malloc(sizeof(maa_gpio_context));
if ((export_f = fopen("/sys/class/gpio/export", "w")) == NULL) {
fprintf(stderr, "Failed to open export for writing!\n");
return NULL;
} else {
fprintf(export_f, "%d", pin);
fclose(export_f);
@@ -57,13 +65,13 @@ maa_gpio_init(int pin)
return dev;
}
void
maa_result_t
maa_gpio_mode(maa_gpio_context *dev, gpio_mode_t mode)
{
//gpio->pin
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
void
maa_result_t
maa_gpio_dir(maa_gpio_context *dev, gpio_dir_t dir)
{
if (dev->value_fp != NULL) {
@@ -75,11 +83,23 @@ maa_gpio_dir(maa_gpio_context *dev, gpio_dir_t dir)
FILE *direction;
if ((direction = fopen(filepath, "w")) == NULL) {
fprintf(stderr, "Failed to open direction for writing!\n");
} else {
fprintf(direction, dir);
fclose(direction);
dev->value_fp = NULL;
return MAA_ERROR_INVALID_RESOURCE;
}
switch(dir) {
case MAA_GPIO_OUT:
fprintf(direction, "out");
break;
case MAA_GPIO_IN:
fprintf(direction, "in");
break;
default:
fclose(direction);
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
break;
}
fclose(direction);
dev->value_fp = NULL;
return MAA_SUCCESS;
}
int
@@ -95,7 +115,7 @@ maa_gpio_read(maa_gpio_context *dev)
return atoi(buffer);
}
void
maa_result_t
maa_gpio_write(maa_gpio_context *dev, int value)
{
if (dev->value_fp == NULL) {
@@ -104,18 +124,24 @@ maa_gpio_write(maa_gpio_context *dev, int value)
fseek(dev->value_fp, SEEK_SET, 0);
fprintf(dev->value_fp, "%d", value);
fseek(dev->value_fp, SEEK_SET, 0);
if (ferror(dev->value_fp) != 0)
return MAA_ERROR_INVALID_RESOURCE;
return MAA_SUCCESS;
}
void
maa_result_t
maa_gpio_close(maa_gpio_context *dev)
{
FILE *unexport_f;
if ((unexport_f = fopen("/sys/class/gpio/unexport", "w")) == NULL) {
fprintf(stderr, "Failed to open unexport for writing!\n");
} else {
fprintf(unexport_f, "%d", dev->pin);
fclose(unexport_f);
return MAA_ERROR_INVALID_RESOURCE;
}
fprintf(unexport_f, "%d", dev->pin);
fclose(unexport_f);
if (ferror(dev->value_fp) != 0)
return MAA_ERROR_INVALID_RESOURCE;
free(dev);
return MAA_SUCCESS;
}