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authorAndrew Jeffery <andrew@aj.id.au>2017-08-28 09:47:11 +0930
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2017-08-29 21:10:40 +0200
commitf5808ac158f2b16b686a3d3c0879c5d6048aba14 (patch)
treee223e075b1e3b1877d644c2104effb193077c4eb /drivers/leds
parent0f34f958768c48037ce19cdc5d863a7316a86d44 (diff)
leds: gpio: Allow LED to retain state at shutdown
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 <andrew@aj.id.au> Acked-by: Pavel Machek <pavel@ucw.cz> Tested-by: Brandon Wyman <bjwyman@gmail.com> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-gpio.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index e753ba93ba1e..764c31301f90 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -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);
}
}