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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 <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>
This commit is contained in:
Andrew Jeffery 2017-08-28 09:47:11 +09:30 • committed by Jacek Anaszewski
parent 0f34f95876
commit f5808ac158
2 changed files with 8 additions and 1 deletions
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2
include/linux/leds.h
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@ -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;
};