diff options
| author | Andrew Jeffery <andrew@aj.id.au> | 2017-08-28 02:17:11 +0200 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2017-08-29 21:10:40 +0200 |
| commit | f5808ac158f2b16b686a3d3c0879c5d6048aba14 (patch) | |
| tree | e223e075b1e3b1877d644c2104effb193077c4eb /drivers/leds | |
| parent | dt-bindings: leds: gpio: Add optional retain-state-shutdown property (diff) | |
| download | linux-f5808ac158f2b16b686a3d3c0879c5d6048aba14.tar.xz linux-f5808ac158f2b16b686a3d3c0879c5d6048aba14.zip | |
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.c | 7 |
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); } } |