diff options
| author | Igor Grinberg <grinberg@compulab.co.il> | 2013-11-08 01:03:52 +0200 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-11-25 10:41:52 -0500 |
| commit | 9dfdcdfed4726f94fc38d94f29f8214f38058576 (patch) | |
| tree | 7f621f7ada71e5ee3aad125245e52633e938d2e0 | |
| parent | 6516f81b64c71ab2be61f304d0e13dd84f730484 (diff) | |
| download | u-boot-imx-9dfdcdfed4726f94fc38d94f29f8214f38058576.zip u-boot-imx-9dfdcdfed4726f94fc38d94f29f8214f38058576.tar.gz u-boot-imx-9dfdcdfed4726f94fc38d94f29f8214f38058576.tar.bz2 | |
gpio_led: add support for inverted polarity
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>
| -rw-r--r-- | README | 7 | ||||
| -rw-r--r-- | drivers/misc/gpio_led.c | 27 |
2 files changed, 32 insertions, 2 deletions
@@ -1971,6 +1971,13 @@ CBFS (Coreboot Filesystem) support status LED backend implementation. Define CONFIG_GPIO_LED to include the gpio_led driver in the U-Boot binary. + CONFIG_GPIO_LED_INVERTED_TABLE + Some GPIO connected LEDs may have inverted polarity in which + case the GPIO high value corresponds to LED off state and + GPIO low value corresponds to LED on state. + In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined + with a list of GPIO LEDs that have inverted polarity. + - CAN Support: CONFIG_CAN_DRIVER Defining CONFIG_CAN_DRIVER enables CAN driver support diff --git a/drivers/misc/gpio_led.c b/drivers/misc/gpio_led.c index de20419..3e95727 100644 --- a/drivers/misc/gpio_led.c +++ b/drivers/misc/gpio_led.c @@ -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) |