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gpio_led: add support for inverted polarity

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Some GPIO connected LEDs have inverted polarity.
Introduce new config option: CONFIG_GPIO_LED_INVERTED_TABLE for the
specifying the inverted GPIO LEDs list and add support for this in the
gpio_led driver.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Tested-by: Ilya Ledvich <ilya@compulab.co.il>
This commit is contained in:
Igor Grinberg
2013-11-08 01:03:52 +02:00
committed by Tom Rini
parent 6516f81b64
commit 9dfdcdfed4
2 changed files with 32 additions and 2 deletions
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27
drivers/misc/gpio_led.c
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@@ -9,19 +9,42 @@
#include <status_led.h>
#include <asm/gpio.h>
#ifndef CONFIG_GPIO_LED_INVERTED_TABLE
#define CONFIG_GPIO_LED_INVERTED_TABLE {}
#endif
static led_id_t gpio_led_inv[] = CONFIG_GPIO_LED_INVERTED_TABLE;
static int gpio_led_gpio_value(led_id_t mask, int state)
{
int i, gpio_value = (state == STATUS_LED_ON);
for (i = 0; i < ARRAY_SIZE(gpio_led_inv); i++) {
if (gpio_led_inv[i] == mask)
gpio_value = !gpio_value;
}
return gpio_value;
}
void __led_init(led_id_t mask, int state)
{
int gpio_value;
if (gpio_request(mask, "gpio_led") != 0) {
printf("%s: failed requesting GPIO%lu!\n", __func__, mask);
return;
}
gpio_direction_output(mask, state == STATUS_LED_ON);
gpio_value = gpio_led_gpio_value(mask, state);
gpio_direction_output(mask, gpio_value);
}
void __led_set(led_id_t mask, int state)
{
gpio_set_value(mask, state == STATUS_LED_ON);
int gpio_value = gpio_led_gpio_value(mask, state);
gpio_set_value(mask, gpio_value);
}
void __led_toggle(led_id_t mask)