leds: Add suspend/resume state flags to leds-gpio

Add an option to preserve LED state when suspending/resuming to the LED
gpio driver. Based on a suggestion from Robert Jarzmik.
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

drivers/leds/leds-gpio.c

@@ -93,6 +93,7 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
 	}
 	led_dat->cdev.brightness_set = gpio_led_set;
 	led_dat->cdev.brightness = LED_OFF;
+	if (!template->retain_state_suspended)
 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
 
 	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low);

include/linux/leds.h

@@ -141,7 +141,8 @@ struct gpio_led {
 	const char *name;
 	const char *default_trigger;
 	unsigned 	gpio;
-	u8 		active_low;
+	u8 		active_low : 1;
+	u8		retain_state_suspended : 1;
 };
 
 struct gpio_led_platform_data {