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leds: gpio: Allow LED to retain state at shutdown

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In some systems, such as Baseboard Management Controllers (BMCs), we
want to retain the state of LEDs across a reboot of the BMC (whilst the
host remains up). Implement support for the retain-state-shutdown
devicetree property in leds-gpio.

Signed-off-by: Andrew Jeffery <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Tested-by: Brandon Wyman <[email protected]>
Signed-off-by: Jacek Anaszewski <[email protected]>
This commit is contained in:
Andrew Jeffery 2017-08-28 09:47:11 +09:30 • committed by Jacek Anaszewski
commit f5808ac158
2 changed files with 8 additions and 1 deletions
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7
drivers/leds/leds-gpio.c
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@ -134,6 +134,8 @@ static int create_gpio_led(const struct gpio_led *template,
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
if (template->panic_indicator)
led_dat->cdev.flags |= LED_PANIC_INDICATOR;
if (template->retain_state_shutdown)
led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;
ret = gpiod_direction_output(led_dat->gpiod, state);
if (ret < 0)
@ -205,6 +207,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
if (fwnode_property_present(child, "retain-state-suspended"))
led.retain_state_suspended = 1;
if (fwnode_property_present(child, "retain-state-shutdown"))
led.retain_state_shutdown = 1;
if (fwnode_property_present(child, "panic-indicator"))
led.panic_indicator = 1;
@ -267,7 +271,8 @@ static void gpio_led_shutdown(struct platform_device *pdev)
for (i = 0; i < priv->num_leds; i++) {
struct gpio_led_data *led = &priv->leds[i];
gpio_led_set(&led->cdev, LED_OFF);
if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
gpio_led_set(&led->cdev, LED_OFF);
}
}