Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds

* 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds:
  leds/acpi: Fix merge fallout from acpi_driver_data change
  leds: Simplify logic in leds-ams-delta
  leds: Fix trigger registration race
  leds: Fix leds-class.c comment
  leds: Add driver for HP harddisk protection LEDs
  leds: leds-pca955x - Mark pca955x_led_set() static
  leds: Remove uneeded leds-cm-x270 driver
  leds: Remove uneeded strlen calls
  leds: Add leds-wrap default-trigger
  leds: Make default trigger fields const
  leds: Add backlight LED trigger
  leds: da903x: Add support for LEDs found on DA9030/DA9034

drivers/leds/Kconfig

@@ -113,11 +113,12 @@ config LEDS_GPIO
 	  outputs. To be useful the particular board must have LEDs
 	  and they must be connected to the GPIO lines.
 
-config LEDS_CM_X270
-	tristate "LED Support for the CM-X270 LEDs"
-	depends on LEDS_CLASS && MACH_ARMCORE
+config LEDS_HP_DISK
+	tristate "LED Support for disk protection LED on HP notebooks"
+	depends on LEDS_CLASS && ACPI
 	help
-	  This option enables support for the CM-X270 LEDs.
+	  This option enable support for disk protection LED, found on
+	  newer HP notebooks.
 
 config LEDS_CLEVO_MAIL
 	tristate "Mail LED on Clevo notebook (EXPERIMENTAL)"
@@ -157,6 +158,13 @@ config LEDS_PCA955X
 	  LED driver chips accessed via the I2C bus.  Supported
 	  devices include PCA9550, PCA9551, PCA9552, and PCA9553.
 
+config LEDS_DA903X
+	tristate "LED Support for DA9030/DA9034 PMIC"
+	depends on LEDS_CLASS && PMIC_DA903X
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Dialog Semiconductor DA9030/DA9034 PMICs.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS
@@ -193,6 +201,15 @@ config LEDS_TRIGGER_HEARTBEAT
 	  load average.
 	  If unsure, say Y.
 
+config LEDS_TRIGGER_BACKLIGHT
+	tristate "LED backlight Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled as a backlight device: they
+	  turn off and on when the display is blanked and unblanked.
+
+	  If unsure, say N.
+
 config LEDS_TRIGGER_DEFAULT_ON
 	tristate "LED Default ON Trigger"
 	depends on LEDS_TRIGGERS

drivers/leds/Makefile

@@ -17,14 +17,16 @@ obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
 obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
 obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
 obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
-obj-$(CONFIG_LEDS_CM_X270)              += leds-cm-x270.o
 obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
 obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
 obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
 obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
+obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o
+obj-$(CONFIG_LEDS_HP_DISK)		+= leds-hp-disk.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
 obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK)	+= ledtrig-ide-disk.o
 obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT)	+= ledtrig-heartbeat.o
+obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)	+= ledtrig-backlight.o
 obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o

drivers/leds/led-class.c

@@ -34,14 +34,11 @@ static ssize_t led_brightness_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
-	ssize_t ret = 0;
 
 	/* no lock needed for this */
 	led_update_brightness(led_cdev);
-	sprintf(buf, "%u\n", led_cdev->brightness);
-	ret = strlen(buf) + 1;
 
-	return ret;
+	return sprintf(buf, "%u\n", led_cdev->brightness);
 }
 
 static ssize_t led_brightness_store(struct device *dev,
@@ -113,6 +110,9 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 	if (rc)
 		goto err_out;
 
+#ifdef CONFIG_LEDS_TRIGGERS
+	init_rwsem(&led_cdev->trigger_lock);
+#endif
 	/* add to the list of leds */
 	down_write(&leds_list_lock);
 	list_add_tail(&led_cdev->node, &leds_list);
@@ -121,8 +121,6 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 	led_update_brightness(led_cdev);
 
 #ifdef CONFIG_LEDS_TRIGGERS
-	init_rwsem(&led_cdev->trigger_lock);
-
 	rc = device_create_file(led_cdev->dev, &dev_attr_trigger);
 	if (rc)
 		goto err_out_led_list;
@@ -147,7 +145,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 EXPORT_SYMBOL_GPL(led_classdev_register);
 
 /**
- * __led_classdev_unregister - unregisters a object of led_properties class.
+ * led_classdev_unregister - unregisters a object of led_properties class.
  * @led_cdev: the led device to unregister
  *
  * Unregisters a previously registered via led_classdev_register object.

drivers/leds/leds-ams-delta.c

@@ -107,19 +107,19 @@ static int ams_delta_led_resume(struct platform_device *dev)
 
 static int ams_delta_led_probe(struct platform_device *pdev)
 {
-	int i;
-	int ret;
+	int i, ret;
 
-	for (i = ret = 0; ret >= 0 && i < ARRAY_SIZE(ams_delta_leds); i++) {
+	for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i++) {
 		ret = led_classdev_register(&pdev->dev,
 				&ams_delta_leds[i].cdev);
+		if (ret < 0)
+			goto fail;
 	}
 
-	if (ret < 0 && i > 1) {
-		for (i = i - 2; i >= 0; i--)
+	return 0;
+fail:
+	while (--i >= 0)
 		led_classdev_unregister(&ams_delta_leds[i].cdev);
-	}
-
 	return ret;	
 }
 
@@ -127,7 +127,7 @@ static int ams_delta_led_remove(struct platform_device *pdev)
 {
 	int i;
 
-	for (i = ARRAY_SIZE(ams_delta_leds) - 1; i >= 0; i--)
+	for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i--)
 		led_classdev_unregister(&ams_delta_leds[i].cdev);
 
 	return 0;

drivers/leds/leds-cm-x270.c

-/*
- * drivers/leds/leds-cm-x270.c
- *
- * Copyright 2007 CompuLab Ltd.
- * Author: Mike Rapoport <mike@compulab.co.il>
- *
- * Based on leds-corgi.c
- * Author: Richard Purdie <rpurdie@openedhand.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/leds.h>
-
-#include <mach/hardware.h>
-#include <mach/pxa-regs.h>
-
-#define GPIO_RED_LED			(93)
-#define GPIO_GREEN_LED			(94)
-
-static void cmx270_red_set(struct led_classdev *led_cdev,
-			   enum led_brightness value)
-{
-	if (value)
-		GPCR(GPIO_RED_LED) = GPIO_bit(GPIO_RED_LED);
-	else
-		GPSR(GPIO_RED_LED) = GPIO_bit(GPIO_RED_LED);
-}
-
-static void cmx270_green_set(struct led_classdev *led_cdev,
-			     enum led_brightness value)
-{
-	if (value)
-		GPCR(GPIO_GREEN_LED) = GPIO_bit(GPIO_GREEN_LED);
-	else
-		GPSR(GPIO_GREEN_LED) = GPIO_bit(GPIO_GREEN_LED);
-}
-
-static struct led_classdev cmx270_red_led = {
-	.name			= "cm-x270:red",
-	.default_trigger	= "nand-disk",
-	.brightness_set		= cmx270_red_set,
-};
-
-static struct led_classdev cmx270_green_led = {
-	.name			= "cm-x270:green",
-	.default_trigger	= "heartbeat",
-	.brightness_set		= cmx270_green_set,
-};
-
-#ifdef CONFIG_PM
-static int cmx270led_suspend(struct platform_device *dev, pm_message_t state)
-{
-	led_classdev_suspend(&cmx270_red_led);
-	led_classdev_suspend(&cmx270_green_led);
-	return 0;
-}
-
-static int cmx270led_resume(struct platform_device *dev)
-{
-	led_classdev_resume(&cmx270_red_led);
-	led_classdev_resume(&cmx270_green_led);
-	return 0;
-}
-#endif
-
-static int cmx270led_probe(struct platform_device *pdev)
-{
-	int ret;
-
-	ret = led_classdev_register(&pdev->dev, &cmx270_red_led);
-	if (ret < 0)
-		return ret;
-
-	ret = led_classdev_register(&pdev->dev, &cmx270_green_led);
-	if (ret < 0)
-		led_classdev_unregister(&cmx270_red_led);
-
-	return ret;
-}
-
-static int cmx270led_remove(struct platform_device *pdev)
-{
-	led_classdev_unregister(&cmx270_red_led);
-	led_classdev_unregister(&cmx270_green_led);
-	return 0;
-}
-
-static struct platform_driver cmx270led_driver = {
-	.probe		= cmx270led_probe,
-	.remove		= cmx270led_remove,
-#ifdef CONFIG_PM
-	.suspend	= cmx270led_suspend,
-	.resume		= cmx270led_resume,
-#endif
-	.driver		= {
-		.name		= "cm-x270-led",
-		.owner		= THIS_MODULE,
-	},
-};
-
-static int __init cmx270led_init(void)
-{
-	return platform_driver_register(&cmx270led_driver);
-}
-
-static void __exit cmx270led_exit(void)
-{
-	platform_driver_unregister(&cmx270led_driver);
-}
-
-module_init(cmx270led_init);
-module_exit(cmx270led_exit);
-
-MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
-MODULE_DESCRIPTION("CM-x270 LED driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:cm-x270-led");

drivers/leds/leds-da903x.c

+/*
+ * LEDs driver for Dialog Semiconductor DA9030/DA9034
+ *
+ * Copyright (C) 2008 Compulab, Ltd.
+ * 	Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * 	Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mfd/da903x.h>
+
+#define DA9030_LED1_CONTROL	0x20
+#define DA9030_LED2_CONTROL	0x21
+#define DA9030_LED3_CONTROL	0x22
+#define DA9030_LED4_CONTROL	0x23
+#define DA9030_LEDPC_CONTROL	0x24
+#define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
+
+#define DA9034_LED1_CONTROL	0x35
+#define DA9034_LED2_CONTROL	0x36
+#define DA9034_VIBRA		0x40
+
+struct da903x_led {
+	struct led_classdev	cdev;
+	struct work_struct	work;
+	struct device		*master;
+	enum led_brightness	new_brightness;
+	int			id;
+	int			flags;
+};
+
+#define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
+#define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
+
+static void da903x_led_work(struct work_struct *work)
+{
+	struct da903x_led *led = container_of(work, struct da903x_led, work);
+	uint8_t val;
+	int offset;
+
+	switch (led->id) {
+	case DA9030_ID_LED_1:
+	case DA9030_ID_LED_2:
+	case DA9030_ID_LED_3:
+	case DA9030_ID_LED_4:
+	case DA9030_ID_LED_PC:
+		offset = DA9030_LED_OFFSET(led->id);
+		val = led->flags & ~0x87;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		val |= (led->new_brightness >> 5) & 0x7; /* PWM<2:0> */
+		da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
+		break;
+	case DA9030_ID_VIBRA:
+		val = led->flags & ~0x80;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
+		break;
+	case DA9034_ID_LED_1:
+	case DA9034_ID_LED_2:
+		offset = DA9034_LED_OFFSET(led->id);
+		val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
+		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
+		da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
+		break;
+	case DA9034_ID_VIBRA:
+		val = led->new_brightness & 0xfe;
+		da903x_write(led->master, DA9034_VIBRA, val);
+		break;
+	}
+}
+
+static void da903x_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct da903x_led *led;
+	
+	led = container_of(led_cdev, struct da903x_led, cdev);
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static int __devinit da903x_led_probe(struct platform_device *pdev)
+{
+	struct led_info *pdata = pdev->dev.platform_data;
+	struct da903x_led *led;
+	int id, ret;
+
+	if (pdata == NULL)
+		return 0;
+
+	id = pdev->id;
+
+	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
+	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
+		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
+		return -EINVAL;
+	}
+
+	led = kzalloc(sizeof(struct da903x_led), GFP_KERNEL);
+	if (led == NULL) {
+		dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
+		return -ENOMEM;
+	}
+
+	led->cdev.name = pdata->name;
+	led->cdev.default_trigger = pdata->default_trigger;
+	led->cdev.brightness_set = da903x_led_set;
+	led->cdev.brightness = LED_OFF;
+
+	led->id = id;
+	led->flags = pdata->flags;
+	led->master = pdev->dev.parent;
+	led->new_brightness = LED_OFF;
+
+	INIT_WORK(&led->work, da903x_led_work);
+
+	ret = led_classdev_register(led->master, &led->cdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register LED %d\n", id);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, led);
+	return 0;
+
+err:
+	kfree(led);
+	return ret;
+}
+
+static int __devexit da903x_led_remove(struct platform_device *pdev)
+{
+	struct da903x_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	kfree(led);
+	return 0;
+}
+
+static struct platform_driver da903x_led_driver = {
+	.driver	= {
+		.name	= "da903x-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da903x_led_probe,
+	.remove		= __devexit_p(da903x_led_remove),
+};
+
+static int __init da903x_led_init(void)
+{
+	return platform_driver_register(&da903x_led_driver);
+}
+module_init(da903x_led_init);
+
+static void __exit da903x_led_exit(void)
+{
+	platform_driver_unregister(&da903x_led_driver);
+}
+module_exit(da903x_led_exit);
+
+MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
+	      "Mike Rapoport <mike@compulab.co.il>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da903x-led");

drivers/leds/leds-hp-disk.c

+/*
+ *  leds-hp-disk.c - driver for HP "hard disk protection" LED
+ *
+ *  Copyright (C) 2008 Pavel Machek
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/kthread.h>
+#include <linux/version.h>
+#include <linux/leds.h>
+#include <acpi/acpi_drivers.h>
+
+#define DRIVER_NAME     "leds-hp-disk"
+#define ACPI_MDPS_CLASS "led"
+
+/* For automatic insertion of the module */
+static struct acpi_device_id hpled_device_ids[] = {
+	{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
+	{"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, hpled_device_ids);
+
+struct acpi_hpled {
+	struct acpi_device	*device;   /* The ACPI device */
+};
+
+static struct acpi_hpled adev;
+
+static acpi_status hpled_acpi_write(acpi_handle handle, int reg)
+{
+	unsigned long ret; /* Not used when writing */
+	union acpi_object in_obj[1];
+	struct acpi_object_list args = { 1, in_obj };
+
+	in_obj[0].type          = ACPI_TYPE_INTEGER;
+	in_obj[0].integer.value = reg;
+
+	return acpi_evaluate_integer(handle, "ALED", &args, &ret);
+}
+
+static void hpled_set(struct led_classdev *led_cdev,
+			       enum led_brightness value)
+{
+	hpled_acpi_write(adev.device->handle, !!value);
+}
+
+static struct led_classdev hpled_led = {
+	.name			= "hp:red:hddprotection",
+	.default_trigger	= "heartbeat",
+	.brightness_set		= hpled_set,
+};
+
+#ifdef CONFIG_PM
+static int hpled_suspend(struct acpi_device *dev, pm_message_t state)
+{
+	led_classdev_suspend(&hpled_led);
+	return 0;
+}
+
+static int hpled_resume(struct acpi_device *dev)
+{
+	led_classdev_resume(&hpled_led);
+	return 0;
+}
+#else
+#define hpled_suspend NULL
+#define hpled_resume NULL
+#endif
+
+static int hpled_add(struct acpi_device *device)
+{
+	int ret;
+
+	if (!device)
+		return -EINVAL;
+
+	adev.device = device;
+	strcpy(acpi_device_name(device), DRIVER_NAME);
+	strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
+	device->driver_data = &adev;
+
+	ret = led_classdev_register(NULL, &hpled_led);
+	return ret;
+}
+
+static int hpled_remove(struct acpi_device *device, int type)
+{
+	if (!device)
+		return -EINVAL;
+
+	led_classdev_unregister(&hpled_led);
+	return 0;
+}
+
+
+
+static struct acpi_driver leds_hp_driver = {
+	.name  = DRIVER_NAME,
+	.class = ACPI_MDPS_CLASS,
+	.ids   = hpled_device_ids,
+	.ops = {
+		.add     = hpled_add,
+		.remove  = hpled_remove,
+		.suspend = hpled_suspend,
+		.resume  = hpled_resume,
+	}
+};
+
+static int __init hpled_init_module(void)
+{
+	int ret;
+
+	if (acpi_disabled)
+		return -ENODEV;
+
+	ret = acpi_bus_register_driver(&leds_hp_driver);
+	if (ret < 0)
+		return ret;
+
+	printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
+
+	return 0;
+}
+
+static void __exit hpled_exit_module(void)
+{
+	acpi_bus_unregister_driver(&leds_hp_driver);
+}
+
+MODULE_DESCRIPTION("Driver for HP disk protection LED");
+MODULE_AUTHOR("Pavel Machek <pavel@suse.cz>");
+MODULE_LICENSE("GPL");
+
+module_init(hpled_init_module);
+module_exit(hpled_exit_module);

drivers/leds/leds-pca955x.c

@@ -226,7 +226,7 @@ static void pca955x_led_work(struct work_struct *work)
 	pca955x_write_ls(pca955x->client, chip_ls, ls);
 }
 
-void pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value)
+static void pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value)
 {
 	struct pca955x_led *pca955x;
 

drivers/leds/leds-wrap.c

@@ -55,6 +55,7 @@ static void wrap_extra_led_set(struct led_classdev *led_cdev,
 static struct led_classdev wrap_power_led = {
 	.name			= "wrap::power",
 	.brightness_set		= wrap_power_led_set,
+	.default_trigger	= "default-on",
 };
 
 static struct led_classdev wrap_error_led = {

drivers/leds/ledtrig-backlight.c

+/*
+ * Backlight emulation LED trigger
+ *
+ * Copyright 2008 (C) Rodolfo Giometti <giometti@linux.it>
+ * Copyright 2008 (C) Eurotech S.p.A. <info@eurotech.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <linux/leds.h>
+#include "leds.h"
+
+#define BLANK		1
+#define UNBLANK		0
+
+struct bl_trig_notifier {
+	struct led_classdev *led;
+	int brightness;
+	int old_status;
+	struct notifier_block notifier;
+};
+
+static int fb_notifier_callback(struct notifier_block *p,
+				unsigned long event, void *data)
+{
+	struct bl_trig_notifier *n = container_of(p,
+					struct bl_trig_notifier, notifier);
+	struct led_classdev *led = n->led;
+	struct fb_event *fb_event = data;
+	int *blank = fb_event->data;
+
+	switch (event) {
+	case FB_EVENT_BLANK :
+		if (*blank && n->old_status == UNBLANK) {
+			n->brightness = led->brightness;
+			led_set_brightness(led, LED_OFF);
+			n->old_status = BLANK;
+		} else if (!*blank && n->old_status == BLANK) {
+			led_set_brightness(led, n->brightness);
+			n->old_status = UNBLANK;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+static void bl_trig_activate(struct led_classdev *led)
+{
+	int ret;
+
+	struct bl_trig_notifier *n;
+
+	n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
+	led->trigger_data = n;
+	if (!n) {
+		dev_err(led->dev, "unable to allocate backlight trigger\n");
+		return;
+	}
+
+	n->led = led;
+	n->brightness = led->brightness;
+	n->old_status = UNBLANK;
+	n->notifier.notifier_call = fb_notifier_callback;
+
+	ret = fb_register_client(&n->notifier);
+	if (ret)
+		dev_err(led->dev, "unable to register backlight trigger\n");
+}
+
+static void bl_trig_deactivate(struct led_classdev *led)
+{
+	struct bl_trig_notifier *n =
+		(struct bl_trig_notifier *) led->trigger_data;
+
+	if (n) {
+		fb_unregister_client(&n->notifier);
+		kfree(n);
+	}
+}
+
+static struct led_trigger bl_led_trigger = {
+	.name		= "backlight",
+	.activate	= bl_trig_activate,
+	.deactivate	= bl_trig_deactivate
+};
+
+static int __init bl_trig_init(void)
+{
+	return led_trigger_register(&bl_led_trigger);
+}
+
+static void __exit bl_trig_exit(void)
+{
+	led_trigger_unregister(&bl_led_trigger);
+}
+
+module_init(bl_trig_init);
+module_exit(bl_trig_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("Backlight emulation LED trigger");
+MODULE_LICENSE("GPL v2");

drivers/leds/ledtrig-timer.c

@@ -70,9 +70,7 @@ static ssize_t led_delay_on_show(struct device *dev,
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct timer_trig_data *timer_data = led_cdev->trigger_data;
 
-	sprintf(buf, "%lu\n", timer_data->delay_on);
-
-	return strlen(buf) + 1;
+	return sprintf(buf, "%lu\n", timer_data->delay_on);
 }
 
 static ssize_t led_delay_on_store(struct device *dev,
@@ -116,9 +114,7 @@ static ssize_t led_delay_off_show(struct device *dev,
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct timer_trig_data *timer_data = led_cdev->trigger_data;
 
-	sprintf(buf, "%lu\n", timer_data->delay_off);
-
-	return strlen(buf) + 1;
+	return sprintf(buf, "%lu\n", timer_data->delay_off);
 }
 
 static ssize_t led_delay_off_store(struct device *dev,

include/linux/leds.h

@@ -123,7 +123,7 @@ extern void ledtrig_ide_activity(void);
  */
 struct led_info {
 	const char	*name;
-	char		*default_trigger;
+	const char	*default_trigger;
 	int		flags;
 };
 
@@ -135,7 +135,7 @@ struct led_platform_data {
 /* For the leds-gpio driver */
 struct gpio_led {
 	const char *name;
-	char *default_trigger;
+	const char *default_trigger;
 	unsigned 	gpio;
 	u8 		active_low;
 };