Merge branch 'acpi-video'

* acpi-video:
  ACPI / video: Add 4 new models to the use_native_backlight DMI list
  ACPI / video: Add use native backlight quirk for the ThinkPad W530
  ACPI / video: Unregister the backlight device if a raw one shows up later
  backlight: Add backlight device (un)registration notification
  nouveau: Don't check acpi_video_backlight_support() before registering backlight
  acer-wmi: Add Aspire 5741 to video_vendor_dmi_table
  acer-wmi: Switch to acpi_video_unregister_backlight
  ACPI / video: Add an acpi_video_unregister_backlight function
  ACPI / video: Don't register acpi_video_resume notifier without backlight devices
  ACPI / video: change acpi-video brightness_switch_enabled default to 0

7 files changed, 245 insertions, 77 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c6e72ee5390..0933ec4924d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3481,7 +3481,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			the allocated input device; If set to 0, video driver
 			will only send out the event without touching backlight
 			brightness level.
-			default: 1
+			default: 0
 
 	virtio_mmio.device=
 			[VMMIO] Memory mapped virtio (platform) device.
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f8bc5a755dd..101fb090dcb 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -68,7 +68,7 @@ MODULE_AUTHOR("Bruno Ducrot");
 MODULE_DESCRIPTION("ACPI Video Driver");
 MODULE_LICENSE("GPL");
 
-static bool brightness_switch_enabled = 1;
+static bool brightness_switch_enabled;
 module_param(brightness_switch_enabled, bool, 0644);
 
 /*
@@ -150,6 +150,8 @@ struct acpi_video_enumerated_device {
 
 struct acpi_video_bus {
 	struct acpi_device *device;
+	bool backlight_registered;
+	bool backlight_notifier_registered;
 	u8 dos_setting;
 	struct acpi_video_enumerated_device *attached_array;
 	u8 attached_count;
@@ -161,6 +163,7 @@ struct acpi_video_bus {
 	struct input_dev *input;
 	char phys[32];	/* for input device */
 	struct notifier_block pm_nb;
+	struct notifier_block backlight_nb;
 };
 
 struct acpi_video_device_flags {
@@ -473,6 +476,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 	},
 	{
 	 .callback = video_set_use_native_backlight,
+	 .ident = "ThinkPad W530",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
+		},
+	},
+	{
+	 .callback = video_set_use_native_backlight,
 	.ident = "ThinkPad X1 Carbon",
 	.matches = {
 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
@@ -488,6 +499,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		},
 	},
 	{
+	 .callback = video_set_use_native_backlight,
+	 .ident = "Lenovo Yoga 2 11",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
+		},
+	},
+	{
 	.callback = video_set_use_native_backlight,
 	.ident = "Thinkpad Helix",
 	.matches = {
@@ -521,6 +540,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 	},
 	{
 	 .callback = video_set_use_native_backlight,
+	 .ident = "Acer Aspire V5-171",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
+		},
+	},
+	{
+	 .callback = video_set_use_native_backlight,
 	 .ident = "Acer Aspire V5-431",
 	 .matches = {
 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
@@ -528,6 +555,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		},
 	},
 	{
+	 .callback = video_set_use_native_backlight,
+	 .ident = "Acer Aspire V5-471G",
+	 .matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
+		},
+	},
+	{
 	.callback = video_set_use_native_backlight,
 	.ident = "HP ProBook 4340s",
 	.matches = {
@@ -579,6 +614,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 	},
 	{
 	.callback = video_set_use_native_backlight,
+	.ident = "HP EliteBook 8470p",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
+		},
+	},
+	{
+	.callback = video_set_use_native_backlight,
 	.ident = "HP EliteBook 8780w",
 	.matches = {
 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
@@ -1658,88 +1701,92 @@ acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
 
 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
 {
-	if (acpi_video_verify_backlight_support()) {
-		struct backlight_properties props;
-		struct pci_dev *pdev;
-		acpi_handle acpi_parent;
-		struct device *parent = NULL;
-		int result;
-		static int count;
-		char *name;
-
-		result = acpi_video_init_brightness(device);
-		if (result)
-			return;
-		name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
-		if (!name)
-			return;
-		count++;
+	struct backlight_properties props;
+	struct pci_dev *pdev;
+	acpi_handle acpi_parent;
+	struct device *parent = NULL;
+	int result;
+	static int count;
+	char *name;
 
-		acpi_get_parent(device->dev->handle, &acpi_parent);
+	result = acpi_video_init_brightness(device);
+	if (result)
+		return;
+	name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
+	if (!name)
+		return;
+	count++;
 
-		pdev = acpi_get_pci_dev(acpi_parent);
-		if (pdev) {
-			parent = &pdev->dev;
-			pci_dev_put(pdev);
-		}
+	acpi_get_parent(device->dev->handle, &acpi_parent);
 
-		memset(&props, 0, sizeof(struct backlight_properties));
-		props.type = BACKLIGHT_FIRMWARE;
-		props.max_brightness = device->brightness->count - 3;
-		device->backlight = backlight_device_register(name,
-							      parent,
-							      device,
-							      &acpi_backlight_ops,
-							      &props);
-		kfree(name);
-		if (IS_ERR(device->backlight))
-			return;
+	pdev = acpi_get_pci_dev(acpi_parent);
+	if (pdev) {
+		parent = &pdev->dev;
+		pci_dev_put(pdev);
+	}
 
-		/*
-		 * Save current brightness level in case we have to restore it
-		 * before acpi_video_device_lcd_set_level() is called next time.
-		 */
-		device->backlight->props.brightness =
-				acpi_video_get_brightness(device->backlight);
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_FIRMWARE;
+	props.max_brightness = device->brightness->count - 3;
+	device->backlight = backlight_device_register(name,
+						      parent,
+						      device,
+						      &acpi_backlight_ops,
+						      &props);
+	kfree(name);
+	if (IS_ERR(device->backlight))
+		return;
 
-		device->cooling_dev = thermal_cooling_device_register("LCD",
-					device->dev, &video_cooling_ops);
-		if (IS_ERR(device->cooling_dev)) {
-			/*
-			 * Set cooling_dev to NULL so we don't crash trying to
-			 * free it.
-			 * Also, why the hell we are returning early and
-			 * not attempt to register video output if cooling
-			 * device registration failed?
-			 * -- dtor
-			 */
-			device->cooling_dev = NULL;
-			return;
-		}
+	/*
+	 * Save current brightness level in case we have to restore it
+	 * before acpi_video_device_lcd_set_level() is called next time.
+	 */
+	device->backlight->props.brightness =
+			acpi_video_get_brightness(device->backlight);
 
-		dev_info(&device->dev->dev, "registered as cooling_device%d\n",
-			 device->cooling_dev->id);
-		result = sysfs_create_link(&device->dev->dev.kobj,
-				&device->cooling_dev->device.kobj,
-				"thermal_cooling");
-		if (result)
-			printk(KERN_ERR PREFIX "Create sysfs link\n");
-		result = sysfs_create_link(&device->cooling_dev->device.kobj,
-				&device->dev->dev.kobj, "device");
-		if (result)
-			printk(KERN_ERR PREFIX "Create sysfs link\n");
+	device->cooling_dev = thermal_cooling_device_register("LCD",
+				device->dev, &video_cooling_ops);
+	if (IS_ERR(device->cooling_dev)) {
+		/*
+		 * Set cooling_dev to NULL so we don't crash trying to free it.
+		 * Also, why the hell we are returning early and not attempt to
+		 * register video output if cooling device registration failed?
+		 * -- dtor
+		 */
+		device->cooling_dev = NULL;
+		return;
 	}
+
+	dev_info(&device->dev->dev, "registered as cooling_device%d\n",
+		 device->cooling_dev->id);
+	result = sysfs_create_link(&device->dev->dev.kobj,
+			&device->cooling_dev->device.kobj,
+			"thermal_cooling");
+	if (result)
+		printk(KERN_ERR PREFIX "Create sysfs link\n");
+	result = sysfs_create_link(&device->cooling_dev->device.kobj,
+			&device->dev->dev.kobj, "device");
+	if (result)
+		printk(KERN_ERR PREFIX "Create sysfs link\n");
 }
 
 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
 {
 	struct acpi_video_device *dev;
 
+	if (video->backlight_registered)
+		return 0;
+
+	if (!acpi_video_verify_backlight_support())
+		return 0;
+
 	mutex_lock(&video->device_list_lock);
 	list_for_each_entry(dev, &video->video_device_list, entry)
 		acpi_video_dev_register_backlight(dev);
 	mutex_unlock(&video->device_list_lock);
 
+	video->backlight_registered = true;
+
 	video->pm_nb.notifier_call = acpi_video_resume;
 	video->pm_nb.priority = 0;
 	return register_pm_notifier(&video->pm_nb);
@@ -1767,13 +1814,20 @@ static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device
 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
 {
 	struct acpi_video_device *dev;
-	int error = unregister_pm_notifier(&video->pm_nb);
+	int error;
+
+	if (!video->backlight_registered)
+		return 0;
+
+	error = unregister_pm_notifier(&video->pm_nb);
 
 	mutex_lock(&video->device_list_lock);
 	list_for_each_entry(dev, &video->video_device_list, entry)
 		acpi_video_dev_unregister_backlight(dev);
 	mutex_unlock(&video->device_list_lock);
 
+	video->backlight_registered = false;
+
 	return error;
 }
 
@@ -1867,6 +1921,56 @@ static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
 	video->input = NULL;
 }
 
+static int acpi_video_backlight_notify(struct notifier_block *nb,
+					unsigned long val, void *bd)
+{
+	struct backlight_device *backlight = bd;
+	struct acpi_video_bus *video;
+
+	/* acpi_video_verify_backlight_support only cares about raw devices */
+	if (backlight->props.type != BACKLIGHT_RAW)
+		return NOTIFY_DONE;
+
+	video = container_of(nb, struct acpi_video_bus, backlight_nb);
+
+	switch (val) {
+	case BACKLIGHT_REGISTERED:
+		if (!acpi_video_verify_backlight_support())
+			acpi_video_bus_unregister_backlight(video);
+		break;
+	case BACKLIGHT_UNREGISTERED:
+		acpi_video_bus_register_backlight(video);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int acpi_video_bus_add_backlight_notify_handler(
+						struct acpi_video_bus *video)
+{
+	int error;
+
+	video->backlight_nb.notifier_call = acpi_video_backlight_notify;
+	video->backlight_nb.priority = 0;
+	error = backlight_register_notifier(&video->backlight_nb);
+	if (error == 0)
+		video->backlight_notifier_registered = true;
+
+	return error;
+}
+
+static int acpi_video_bus_remove_backlight_notify_handler(
+						struct acpi_video_bus *video)
+{
+	if (!video->backlight_notifier_registered)
+		return 0;
+
+	video->backlight_notifier_registered = false;
+
+	return backlight_unregister_notifier(&video->backlight_nb);
+}
+
 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
 {
 	struct acpi_video_device *dev, *next;
@@ -1948,6 +2052,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
 	acpi_video_bus_register_backlight(video);
 	acpi_video_bus_add_notify_handler(video);
+	acpi_video_bus_add_backlight_notify_handler(video);
 
 	return 0;
 
@@ -1971,6 +2076,7 @@ static int acpi_video_bus_remove(struct acpi_device *device)
 
 	video = acpi_driver_data(device);
 
+	acpi_video_bus_remove_backlight_notify_handler(video);
 	acpi_video_bus_remove_notify_handler(video);
 	acpi_video_bus_unregister_backlight(video);
 	acpi_video_bus_put_devices(video);
@@ -2061,6 +2167,20 @@ void acpi_video_unregister(void)
 }
 EXPORT_SYMBOL(acpi_video_unregister);
 
+void acpi_video_unregister_backlight(void)
+{
+	struct acpi_video_bus *video;
+
+	if (!register_count)
+		return;
+
+	mutex_lock(&video_list_lock);
+	list_for_each_entry(video, &video_bus_head, entry)
+		acpi_video_bus_unregister_backlight(video);
+	mutex_unlock(&video_list_lock);
+}
+EXPORT_SYMBOL(acpi_video_unregister_backlight);
+
 /*
  * This is kind of nasty. Hardware using Intel chipsets may require
  * the video opregion code to be run first in order to initialise
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index 630f6e84fc0..2c1e4aad7da 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -31,7 +31,6 @@
  */
 
 #include <linux/backlight.h>
-#include <linux/acpi.h>
 
 #include "nouveau_drm.h"
 #include "nouveau_reg.h"
@@ -222,14 +221,6 @@ nouveau_backlight_init(struct drm_device *dev)
 	struct nouveau_device *device = nv_device(drm->device);
 	struct drm_connector *connector;
 
-#ifdef CONFIG_ACPI
-	if (acpi_video_backlight_support()) {
-		NV_INFO(drm, "ACPI backlight interface available, "
-			     "not registering our own\n");
-		return 0;
-	}
-#endif
-
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index c91f69b39db..bbf78b2d6d9 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -570,6 +570,14 @@ static const struct dmi_system_id video_vendor_dmi_table[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 		},
 	},
+	{
+		.callback = video_set_backlight_video_vendor,
+		.ident = "Acer Aspire 5741",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
+		},
+	},
 	{}
 };
 
@@ -2228,7 +2236,7 @@ static int __init acer_wmi_init(void)
 		pr_info("Brightness must be controlled by acpi video driver\n");
 	} else {
 		pr_info("Disabling ACPI video driver\n");
-		acpi_video_unregister();
+		acpi_video_unregister_backlight();
 	}
 
 	if (wmi_has_guid(WMID_GUID3)) {
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index bd2172c2d65..428089009cd 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -23,6 +23,7 @@
 
 static struct list_head backlight_dev_list;
 static struct mutex backlight_dev_list_mutex;
+static struct blocking_notifier_head backlight_notifier;
 
 static const char *const backlight_types[] = {
 	[BACKLIGHT_RAW] = "raw",
@@ -370,6 +371,9 @@ struct backlight_device *backlight_device_register(const char *name,
 	list_add(&new_bd->entry, &backlight_dev_list);
 	mutex_unlock(&backlight_dev_list_mutex);
 
+	blocking_notifier_call_chain(&backlight_notifier,
+				     BACKLIGHT_REGISTERED, new_bd);
+
 	return new_bd;
 }
 EXPORT_SYMBOL(backlight_device_register);
@@ -413,6 +417,10 @@ void backlight_device_unregister(struct backlight_device *bd)
 		pmac_backlight = NULL;
 	mutex_unlock(&pmac_backlight_mutex);
 #endif
+
+	blocking_notifier_call_chain(&backlight_notifier,
+				     BACKLIGHT_UNREGISTERED, bd);
+
 	mutex_lock(&bd->ops_lock);
 	bd->ops = NULL;
 	mutex_unlock(&bd->ops_lock);
@@ -438,6 +446,36 @@ static int devm_backlight_device_match(struct device *dev, void *res,
 }
 
 /**
+ * backlight_register_notifier - get notified of backlight (un)registration
+ * @nb: notifier block with the notifier to call on backlight (un)registration
+ *
+ * @return 0 on success, otherwise a negative error code
+ *
+ * Register a notifier to get notified when backlight devices get registered
+ * or unregistered.
+ */
+int backlight_register_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&backlight_notifier, nb);
+}
+EXPORT_SYMBOL(backlight_register_notifier);
+
+/**
+ * backlight_unregister_notifier - unregister a backlight notifier
+ * @nb: notifier block to unregister
+ *
+ * @return 0 on success, otherwise a negative error code
+ *
+ * Register a notifier to get notified when backlight devices get registered
+ * or unregistered.
+ */
+int backlight_unregister_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&backlight_notifier, nb);
+}
+EXPORT_SYMBOL(backlight_unregister_notifier);
+
+/**
  * devm_backlight_device_register - resource managed backlight_device_register()
  * @dev: the device to register
  * @name: the name of the device
@@ -544,6 +582,8 @@ static int __init backlight_class_init(void)
 	backlight_class->pm = &backlight_class_dev_pm_ops;
 	INIT_LIST_HEAD(&backlight_dev_list);
 	mutex_init(&backlight_dev_list_mutex);
+	BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
+
 	return 0;
 }
 
diff --git a/include/acpi/video.h b/include/acpi/video.h
index 61109f2609f..ea4c7bbded4 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -19,11 +19,13 @@ struct acpi_device;
 #if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
 extern int acpi_video_register(void);
 extern void acpi_video_unregister(void);
+extern void acpi_video_unregister_backlight(void);
 extern int acpi_video_get_edid(struct acpi_device *device, int type,
 			       int device_id, void **edid);
 #else
 static inline int acpi_video_register(void) { return 0; }
 static inline void acpi_video_unregister(void) { return; }
+static inline void acpi_video_unregister_backlight(void) { return; }
 static inline int acpi_video_get_edid(struct acpi_device *device, int type,
 				      int device_id, void **edid)
 {
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 72647429adf..adb14a8616d 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -40,6 +40,11 @@ enum backlight_type {
 	BACKLIGHT_TYPE_MAX,
 };
 
+enum backlight_notification {
+	BACKLIGHT_REGISTERED,
+	BACKLIGHT_UNREGISTERED,
+};
+
 struct backlight_device;
 struct fb_info;
 
@@ -133,6 +138,8 @@ extern void devm_backlight_device_unregister(struct device *dev,
 extern void backlight_force_update(struct backlight_device *bd,
 				   enum backlight_update_reason reason);
 extern bool backlight_device_registered(enum backlight_type type);
+extern int backlight_register_notifier(struct notifier_block *nb);
+extern int backlight_unregister_notifier(struct notifier_block *nb);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)