Commit f5808ac1 authored by Andrew Jeffery's avatar Andrew Jeffery Committed by Jacek Anaszewski

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: default avatarAndrew Jeffery <andrew@aj.id.au>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Tested-by: default avatarBrandon Wyman <bjwyman@gmail.com>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent 0f34f958
......@@ -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;
......@@ -267,6 +271,7 @@ 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];
if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
gpio_led_set(&led->cdev, LED_OFF);
}
}
......
......@@ -49,6 +49,7 @@ struct led_classdev {
#define LED_HW_PLUGGABLE (1 << 19)
#define LED_PANIC_INDICATOR (1 << 20)
#define LED_BRIGHT_HW_CHANGED (1 << 21)
#define LED_RETAIN_AT_SHUTDOWN (1 << 22)
/* set_brightness_work / blink_timer flags, atomic, private. */
unsigned long work_flags;
......@@ -392,6 +393,7 @@ struct gpio_led {
unsigned retain_state_suspended : 1;
unsigned panic_indicator : 1;
unsigned default_state : 2;
unsigned retain_state_shutdown : 1;
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
struct gpio_desc *gpiod;
};
......
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