Commit 1bd465e6 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Richard Purdie
Browse files

leds: allow led-drivers to use a variable range of brightness values 



This patch allows drivers to override the default maximum brightness value
of 255.  We take care to preserve backwards-compatibility as much as
possible, so that user-space ABI doesn't change for existing drivers.
LED trigger code has also been updated to use the per-LED maximum.

Signed-off-by: default avatarGuennadi Liakhovetski <lg@denx.de>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent a7d878af

drivers/leds/led-class.c

+20 −1
Original line number Diff line number Diff line
@@ -64,7 +64,16 @@ static ssize_t led_brightness_store(struct device *dev, 
	return ret;

}



static ssize_t led_max_brightness_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);



	return sprintf(buf, "%u\n", led_cdev->max_brightness);

}



static DEVICE_ATTR(brightness, 0644, led_brightness_show, led_brightness_store);

static DEVICE_ATTR(max_brightness, 0444, led_max_brightness_show, NULL);

#ifdef CONFIG_LEDS_TRIGGERS

static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);

#endif
@@ -138,6 +147,13 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) 
	list_add_tail(&led_cdev->node, &leds_list);

	up_write(&leds_list_lock);



	if (!led_cdev->max_brightness)

		led_cdev->max_brightness = LED_FULL;



	rc = device_create_file(led_cdev->dev, &dev_attr_max_brightness);

	if (rc)

		goto err_out_attr_max;



	led_update_brightness(led_cdev);



#ifdef CONFIG_LEDS_TRIGGERS
@@ -155,9 +171,11 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) 


#ifdef CONFIG_LEDS_TRIGGERS

err_out_led_list:

	device_remove_file(led_cdev->dev, &dev_attr_max_brightness);

#endif

err_out_attr_max:

	device_remove_file(led_cdev->dev, &dev_attr_brightness);

	list_del(&led_cdev->node);

#endif

err_out:

	device_unregister(led_cdev->dev);

	return rc;
@@ -172,6 +190,7 @@ EXPORT_SYMBOL_GPL(led_classdev_register); 
 */

void led_classdev_unregister(struct led_classdev *led_cdev)

{

	device_remove_file(led_cdev->dev, &dev_attr_max_brightness);

	device_remove_file(led_cdev->dev, &dev_attr_brightness);

#ifdef CONFIG_LEDS_TRIGGERS

	device_remove_file(led_cdev->dev, &dev_attr_trigger);

drivers/leds/leds.h

+2 −2
Original line number Diff line number Diff line
@@ -20,8 +20,8 @@ 
static inline void led_set_brightness(struct led_classdev *led_cdev,

					enum led_brightness value)

{

	if (value > LED_FULL)

		value = LED_FULL;

	if (value > led_cdev->max_brightness)

		value = led_cdev->max_brightness;

	led_cdev->brightness = value;

	if (!(led_cdev->flags & LED_SUSPENDED))

		led_cdev->brightness_set(led_cdev, value);

drivers/leds/ledtrig-default-on.c

+1 −1
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 


static void defon_trig_activate(struct led_classdev *led_cdev)

{

	led_set_brightness(led_cdev, LED_FULL);

	led_set_brightness(led_cdev, led_cdev->max_brightness);

}



static struct led_trigger defon_led_trigger = {

drivers/leds/ledtrig-heartbeat.c

+2 −2
Original line number Diff line number Diff line
@@ -47,7 +47,7 @@ static void led_heartbeat_function(unsigned long data) 
			msecs_to_jiffies(heartbeat_data->period);

		delay = msecs_to_jiffies(70);

		heartbeat_data->phase++;

		brightness = LED_FULL;

		brightness = led_cdev->max_brightness;

		break;

	case 1:

		delay = heartbeat_data->period / 4 - msecs_to_jiffies(70);
@@ -56,7 +56,7 @@ static void led_heartbeat_function(unsigned long data) 
	case 2:

		delay = msecs_to_jiffies(70);

		heartbeat_data->phase++;

		brightness = LED_FULL;

		brightness = led_cdev->max_brightness;

		break;

	default:

		delay = heartbeat_data->period - heartbeat_data->period / 4 -

drivers/leds/ledtrig-ide-disk.c

+2 −1
Original line number Diff line number Diff line
@@ -37,7 +37,8 @@ static void ledtrig_ide_timerfunc(unsigned long data) 
{

	if (ide_lastactivity != ide_activity) {

		ide_lastactivity = ide_activity;

		led_trigger_event(ledtrig_ide, LED_FULL);

		/* INT_MAX will set each LED to its maximum brightness */

		led_trigger_event(ledtrig_ide, INT_MAX);

		mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));

	} else {

		led_trigger_event(ledtrig_ide, LED_OFF);

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