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gpio: Add support for setting GPIO ouput drive.

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*Supports all exposed to sysfs

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-04-29 16:55:54 +01:00
parent 226c6bcb66
commit 0c0633e724
1 changed files with 33 additions and 2 deletions
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35
src/gpio/gpio.c
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@@ -45,7 +45,7 @@ maa_gpio_context*
maa_gpio_init(int pin)
{
//TODO
return NULL;
return maa_gpio_init_raw(pin);
}
maa_gpio_context*
@@ -68,7 +68,38 @@ maa_gpio_init_raw(int pin)
maa_result_t
maa_gpio_mode(maa_gpio_context *dev, gpio_mode_t mode)
{
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
if (dev->value_fp != NULL) {
dev->value_fp = NULL;
}
char filepath[64];
snprintf(filepath, 64, "/sys/class/gpio/gpio%d/drive", dev->pin);
FILE *drive;
if ((drive = fopen(filepath, "w")) == NULL) {
fprintf(stderr, "Failed to open drive for writing!\n");
return MAA_ERROR_INVALID_RESOURCE;
}
switch(mode) {
case MAA_GPIO_STRONG:
fprintf(drive, "strong");
break;
case MAA_GPIO_PULLUP:
fprintf(drive, "pullup");
break;
case MAA_GPIO_PULLDOWN:
fprintf(drive, "pulldown");
break;
case MAA_GPIO_HIZ:
fprintf(drive, "hiz");
break;
default:
fclose(drive);
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
break;
}
fclose(drive);
dev->value_fp = NULL;
return MAA_SUCCESS;
}
maa_result_t