[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / video_detect.c

/*
 *  Copyright (C) 2015       Red Hat Inc.
 *                           Hans de Goede <hdegoede@redhat.com>
 *  Copyright (C) 2008       SuSE Linux Products GmbH
 *                           Thomas Renninger <trenn@suse.de>
 *
 *  May be copied or modified under the terms of the GNU General Public License
 *
 * video_detect.c:
 * After PCI devices are glued with ACPI devices
 * acpi_get_pci_dev() can be called to identify ACPI graphics
 * devices for which a real graphics card is plugged in
 *
 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
 * are available, video.ko should be used to handle the device.
 *
 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
 * sony_acpi,... can take care about backlight brightness.
 *
 * Backlight drivers can use acpi_video_get_backlight_type() to determine
 * which driver should handle the backlight.
 *
 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
 * this file will not be compiled and acpi_video_get_backlight_type() will
 * always return acpi_backlight_vendor.
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <acpi/video.h>

ACPI_MODULE_NAME("video");
#define _COMPONENT		ACPI_VIDEO_COMPONENT

void acpi_video_unregister_backlight(void);

static bool backlight_notifier_registered;
static struct notifier_block backlight_nb;
static struct work_struct backlight_notify_work;

static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;

static void acpi_video_parse_cmdline(void)
{
	if (!strcmp("vendor", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_vendor;
	if (!strcmp("video", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_video;
	if (!strcmp("native", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_native;
	if (!strcmp("none", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_none;
}

static acpi_status
find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	long *cap = context;
	struct pci_dev *dev;
	struct acpi_device *acpi_dev;

	static const struct acpi_device_id video_ids[] = {
		{ACPI_VIDEO_HID, 0},
		{"", 0},
	};
	if (acpi_bus_get_device(handle, &acpi_dev))
		return AE_OK;

	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
		dev = acpi_get_pci_dev(handle);
		if (!dev)
			return AE_OK;
		pci_dev_put(dev);
		*cap |= acpi_is_video_device(handle);
	}
	return AE_OK;
}

/* Force to use vendor driver when the ACPI device is known to be
 * buggy */
static int video_detect_force_vendor(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_vendor;
	return 0;
}

static int video_detect_force_video(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_video;
	return 0;
}

static int video_detect_force_native(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_native;
	return 0;
}

static const struct dmi_system_id video_detect_dmi_table[] = {
	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	 * ACPI backlight device is used. This flag will definitively break
	 * the backlight interface (even the vendor interface) untill next
	 * reboot. It's why we should prevent video.ko from being used here
	 * and we can't rely on a later call to acpi_video_unregister().
	 */
	{
	 .callback = video_detect_force_vendor,
	 .ident = "X360",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
		DMI_MATCH(DMI_BOARD_NAME, "X360"),
		},
	},
	{
	.callback = video_detect_force_vendor,
	.ident = "Asus UL30VT",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
		},
	},
	{
	.callback = video_detect_force_vendor,
	.ident = "Asus UL30A",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
		},
	},

	/*
	 * These models have a working acpi_video backlight control, and using
	 * native backlight causes a regression where backlight does not work
	 * when userspace is not handling brightness key events. Disable
	 * native_backlight on these to fix this:
	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
	 */
	{
	 .callback = video_detect_force_video,
	 .ident = "ThinkPad T420",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 .ident = "ThinkPad T520",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 .ident = "ThinkPad X201s",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
		},
	},
        {
         .callback = video_detect_force_video,
         .ident = "ThinkPad X201T",
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
                },
        },

	/* The native backlight controls do not work on some older machines */
	{
	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	 .callback = video_detect_force_video,
	 .ident = "HP ENVY 15 Notebook",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "3570R/370R/470R/450R/510R/4450RV"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 730U3E/740U3E",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
		},
	},
	{
	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
	 .callback = video_detect_force_video,
	 .ident = "Dell XPS14 L421X",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
	 .callback = video_detect_force_video,
	 .ident = "Dell XPS15 L521X",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 530U4E/540U4E",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
		},
	},

	/* Non win8 machines which need native backlight nevertheless */
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
	 .callback = video_detect_force_native,
	 .ident = "Lenovo Ideapad S405",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
	 .callback = video_detect_force_native,
	 .ident = "Lenovo Ideapad Z570",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
	 .callback = video_detect_force_native,
	 .ident = "Apple MacBook Pro 12,1",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 .ident = "Dell Vostro V131",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
	 .callback = video_detect_force_native,
	 .ident = "Dell XPS 17 L702X",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
		},
	},
	{ },
};

/* This uses a workqueue to avoid various locking ordering issues */
static void acpi_video_backlight_notify_work(struct work_struct *work)
{
	if (acpi_video_get_backlight_type() != acpi_backlight_video)
		acpi_video_unregister_backlight();
}

static int acpi_video_backlight_notify(struct notifier_block *nb,
				       unsigned long val, void *bd)
{
	struct backlight_device *backlight = bd;

	/* A raw bl registering may change video -> native */
	if (backlight->props.type == BACKLIGHT_RAW &&
	    val == BACKLIGHT_REGISTERED)
		schedule_work(&backlight_notify_work);

	return NOTIFY_OK;
}

/*
 * Determine which type of backlight interface to use on this system,
 * First check cmdline, then dmi quirks, then do autodetect.
 *
 * The autodetect order is:
 * 1) Is the acpi-video backlight interface supported ->
 *  no, use a vendor interface
 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 *  yes, use a native interface
 * 3) Else use the acpi-video interface
 *
 * Arguably the native on win8 check should be done first, but that would
 * be a behavior change, which may causes issues.
 */
enum acpi_backlight_type acpi_video_get_backlight_type(void)
{
	static DEFINE_MUTEX(init_mutex);
	static bool init_done;
	static long video_caps;

	/* Parse cmdline, dmi and acpi only once */
	mutex_lock(&init_mutex);
	if (!init_done) {
		acpi_video_parse_cmdline();
		dmi_check_system(video_detect_dmi_table);
		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
				    ACPI_UINT32_MAX, find_video, NULL,
				    &video_caps, NULL);
		INIT_WORK(&backlight_notify_work,
			  acpi_video_backlight_notify_work);
		backlight_nb.notifier_call = acpi_video_backlight_notify;
		backlight_nb.priority = 0;
		if (backlight_register_notifier(&backlight_nb) == 0)
			backlight_notifier_registered = true;
		init_done = true;
	}
	mutex_unlock(&init_mutex);

	if (acpi_backlight_cmdline != acpi_backlight_undef)
		return acpi_backlight_cmdline;

	if (acpi_backlight_dmi != acpi_backlight_undef)
		return acpi_backlight_dmi;

	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
		return acpi_backlight_vendor;

	if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
		return acpi_backlight_native;

	return acpi_backlight_video;
}
EXPORT_SYMBOL(acpi_video_get_backlight_type);

/*
 * Set the preferred backlight interface type based on DMI info.
 * This function allows DMI blacklists to be implemented by external
 * platform drivers instead of putting a big blacklist in video_detect.c
 */
void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
{
	acpi_backlight_dmi = type;
	/* Remove acpi-video backlight interface if it is no longer desired */
	if (acpi_video_get_backlight_type() != acpi_backlight_video)
		acpi_video_unregister_backlight();
}
EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);

void __exit acpi_video_detect_exit(void)
{
	if (backlight_notifier_registered)
		backlight_unregister_notifier(&backlight_nb);
}
Commit	Line	Data
c3d6de69	1	/*
87521e16 HG	2	* Copyright (C) 2015 Red Hat Inc.
87521e16 HG	3	* Hans de Goede <hdegoede@redhat.com>
c3d6de69 TR	4	* Copyright (C) 2008 SuSE Linux Products GmbH
	5	* Thomas Renninger <trenn@suse.de>
	6	*
	7	* May be copied or modified under the terms of the GNU General Public License
	8	*
	9	* video_detect.c:
c3d6de69	10	* After PCI devices are glued with ACPI devices
1e4cffe7	11	* acpi_get_pci_dev() can be called to identify ACPI graphics
c3d6de69 TR	12	* devices for which a real graphics card is plugged in
c3d6de69 TR	13	*
c3d6de69 TR	14	* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
	15	* are available, video.ko should be used to handle the device.
	16	*
7ec48ced	17	* Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
677bd810	18	* sony_acpi,... can take care about backlight brightness.
c3d6de69	19	*
87521e16 HG	20	* Backlight drivers can use acpi_video_get_backlight_type() to determine
87521e16 HG	21	* which driver should handle the backlight.
c3d6de69	22	*
87521e16 HG	23	* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
	24	* this file will not be compiled and acpi_video_get_backlight_type() will
	25	* always return acpi_backlight_vendor.
c3d6de69 TR	26	*/
c3d6de69 TR	27
214f2c90	28	#include <linux/export.h>
c3d6de69	29	#include <linux/acpi.h>
87521e16	30	#include <linux/backlight.h>
c3d6de69	31	#include <linux/dmi.h>
14ca7a47	32	#include <linux/module.h>
1e4cffe7	33	#include <linux/pci.h>
87521e16	34	#include <linux/types.h>
7231ed1a	35	#include <linux/workqueue.h>
87521e16	36	#include <acpi/video.h>
c3d6de69 TR	37
c3d6de69 TR	38	ACPI_MODULE_NAME("video");
c3d6de69 TR	39	#define _COMPONENT ACPI_VIDEO_COMPONENT
c3d6de69 TR	40
e7d024c0 HG	41	void acpi_video_unregister_backlight(void);
e7d024c0 HG	42
93a291df HG	43	static bool backlight_notifier_registered;
93a291df HG	44	static struct notifier_block backlight_nb;
7231ed1a	45	static struct work_struct backlight_notify_work;
93a291df	46
87521e16 HG	47	static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
87521e16 HG	48	static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
c3d6de69	49
14ca7a47 HG	50	static void acpi_video_parse_cmdline(void)
	51	{
	52	if (!strcmp("vendor", acpi_video_backlight_string))
87521e16	53	acpi_backlight_cmdline = acpi_backlight_vendor;
14ca7a47	54	if (!strcmp("video", acpi_video_backlight_string))
87521e16 HG	55	acpi_backlight_cmdline = acpi_backlight_video;
	56	if (!strcmp("native", acpi_video_backlight_string))
	57	acpi_backlight_cmdline = acpi_backlight_native;
	58	if (!strcmp("none", acpi_video_backlight_string))
	59	acpi_backlight_cmdline = acpi_backlight_none;
14ca7a47 HG	60	}
14ca7a47 HG	61
c3d6de69 TR	62	static acpi_status
	63	find_video(acpi_handle handle, u32 lvl, void context, void *rv)
	64	{
	65	long *cap = context;
1e4cffe7	66	struct pci_dev *dev;
c3d6de69 TR	67	struct acpi_device *acpi_dev;
c3d6de69 TR	68
4a4f01a6	69	static const struct acpi_device_id video_ids[] = {
c3d6de69 TR	70	{ACPI_VIDEO_HID, 0},
	71	{"", 0},
	72	};
	73	if (acpi_bus_get_device(handle, &acpi_dev))
	74	return AE_OK;
	75
	76	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
1e4cffe7	77	dev = acpi_get_pci_dev(handle);
c3d6de69 TR	78	if (!dev)
c3d6de69 TR	79	return AE_OK;
1e4cffe7	80	pci_dev_put(dev);
d4e1a692	81	*cap \|= acpi_is_video_device(handle);
c3d6de69 TR	82	}
	83	return AE_OK;
	84	}
	85
084940d5 CC	86	/* Force to use vendor driver when the ACPI device is known to be
	87	* buggy */
	88	static int video_detect_force_vendor(const struct dmi_system_id *d)
	89	{
87521e16	90	acpi_backlight_dmi = acpi_backlight_vendor;
084940d5 CC	91	return 0;
	92	}
	93
3bd6bce3 HG	94	static int video_detect_force_video(const struct dmi_system_id *d)
	95	{
	96	acpi_backlight_dmi = acpi_backlight_video;
	97	return 0;
	98	}
	99
	100	static int video_detect_force_native(const struct dmi_system_id *d)
	101	{
	102	acpi_backlight_dmi = acpi_backlight_native;
	103	return 0;
	104	}
	105
4a4f01a6	106	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	107	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	108	* ACPI backlight device is used. This flag will definitively break
	109	* the backlight interface (even the vendor interface) untill next
	110	* reboot. It's why we should prevent video.ko from being used here
	111	* and we can't rely on a later call to acpi_video_unregister().
	112	*/
	113	{
	114	.callback = video_detect_force_vendor,
	115	.ident = "X360",
	116	.matches = {
	117	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	118	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	119	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	120	},
	121	},
d0c2ce16 LT	122	{
	123	.callback = video_detect_force_vendor,
	124	.ident = "Asus UL30VT",
	125	.matches = {
	126	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	127	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	128	},
	129	},
c8f6d835 BT	130	{
	131	.callback = video_detect_force_vendor,
	132	.ident = "Asus UL30A",
	133	.matches = {
	134	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	135	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	136	},
	137	},
3bd6bce3 HG	138
	139	/*
	140	* These models have a working acpi_video backlight control, and using
	141	* native backlight causes a regression where backlight does not work
	142	* when userspace is not handling brightness key events. Disable
	143	* native_backlight on these to fix this:
	144	* https://bugzilla.kernel.org/show_bug.cgi?id=81691
	145	*/
	146	{
	147	.callback = video_detect_force_video,
	148	.ident = "ThinkPad T420",
	149	.matches = {
	150	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	151	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
	152	},
	153	},
	154	{
	155	.callback = video_detect_force_video,
	156	.ident = "ThinkPad T520",
	157	.matches = {
	158	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	159	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
	160	},
	161	},
	162	{
	163	.callback = video_detect_force_video,
	164	.ident = "ThinkPad X201s",
	165	.matches = {
	166	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	167	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
	168	},
	169	},
007d94ca RG	170	{
	171	.callback = video_detect_force_video,
	172	.ident = "ThinkPad X201T",
	173	.matches = {
	174	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	175	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
	176	},
	177	},
3bd6bce3 HG	178
	179	/* The native backlight controls do not work on some older machines */
	180	{
	181	/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	182	.callback = video_detect_force_video,
	183	.ident = "HP ENVY 15 Notebook",
	184	.matches = {
	185	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	186	DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
	187	},
	188	},
	189	{
	190	.callback = video_detect_force_video,
	191	.ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
	192	.matches = {
	193	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	194	DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
	195	},
	196	},
	197	{
	198	.callback = video_detect_force_video,
	199	.ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
	200	.matches = {
	201	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	202	DMI_MATCH(DMI_PRODUCT_NAME,
	203	"370R4E/370R4V/370R5E/3570RE/370R5V"),
	204	},
	205	},
	206	{
	207	/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	208	.callback = video_detect_force_video,
	209	.ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
	210	.matches = {
	211	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	212	DMI_MATCH(DMI_PRODUCT_NAME,
	213	"3570R/370R/470R/450R/510R/4450RV"),
	214	},
	215	},
	216	{
	217	/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
	218	.callback = video_detect_force_video,
	219	.ident = "SAMSUNG 730U3E/740U3E",
	220	.matches = {
	221	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	222	DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
	223	},
	224	},
	225	{
	226	/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
	227	.callback = video_detect_force_video,
	228	.ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
	229	.matches = {
	230	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	231	DMI_MATCH(DMI_PRODUCT_NAME,
	232	"900X3C/900X3D/900X3E/900X4C/900X4D"),
	233	},
	234	},
61f9738d HG	235	{
	236	/* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
	237	.callback = video_detect_force_video,
	238	.ident = "Dell XPS14 L421X",
	239	.matches = {
	240	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	241	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
	242	},
	243	},
3bd6bce3 HG	244	{
	245	/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
	246	.callback = video_detect_force_video,
	247	.ident = "Dell XPS15 L521X",
	248	.matches = {
	249	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	250	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
	251	},
	252	},
49eb5208 AL	253	{
	254	/* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
	255	.callback = video_detect_force_video,
	256	.ident = "SAMSUNG 530U4E/540U4E",
	257	.matches = {
	258	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	259	DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
	260	},
	261	},
3bd6bce3 HG	262
3bd6bce3 HG	263	/* Non win8 machines which need native backlight nevertheless */
584d8d1e HG	264	{
	265	/* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
	266	.callback = video_detect_force_native,
	267	.ident = "Lenovo Ideapad S405",
	268	.matches = {
	269	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	270	DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
	271	},
	272	},
3bd6bce3 HG	273	{
	274	/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
	275	.callback = video_detect_force_native,
	276	.ident = "Lenovo Ideapad Z570",
	277	.matches = {
	278	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	279	DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
	280	},
	281	},
	282	{
	283	/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
	284	.callback = video_detect_force_native,
	285	.ident = "Apple MacBook Pro 12,1",
	286	.matches = {
	287	DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
	288	DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
	289	},
	290	},
4b4b3b20 HG	291	{
	292	.callback = video_detect_force_native,
	293	.ident = "Dell Vostro V131",
	294	.matches = {
	295	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	296	DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
	297	},
	298	},
350fa038 HG	299	{
	300	/* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
	301	.callback = video_detect_force_native,
	302	.ident = "Dell XPS 17 L702X",
	303	.matches = {
	304	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	305	DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
	306	},
	307	},
084940d5 CC	308	{ },
	309	};
	310
7231ed1a HG	311	/* This uses a workqueue to avoid various locking ordering issues */
	312	static void acpi_video_backlight_notify_work(struct work_struct *work)
	313	{
	314	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	315	acpi_video_unregister_backlight();
	316	}
	317
93a291df HG	318	static int acpi_video_backlight_notify(struct notifier_block *nb,
	319	unsigned long val, void *bd)
	320	{
	321	struct backlight_device *backlight = bd;
	322
	323	/* A raw bl registering may change video -> native */
	324	if (backlight->props.type == BACKLIGHT_RAW &&
7231ed1a HG	325	val == BACKLIGHT_REGISTERED)
7231ed1a HG	326	schedule_work(&backlight_notify_work);
93a291df HG	327
	328	return NOTIFY_OK;
	329	}
	330
c3d6de69	331	/*
87521e16 HG	332	* Determine which type of backlight interface to use on this system,
	333	* First check cmdline, then dmi quirks, then do autodetect.
	334	*
	335	* The autodetect order is:
	336	* 1) Is the acpi-video backlight interface supported ->
	337	* no, use a vendor interface
	338	* 2) Is this a win8 "ready" BIOS and do we have a native interface ->
	339	* yes, use a native interface
	340	* 3) Else use the acpi-video interface
c3d6de69	341	*
87521e16 HG	342	* Arguably the native on win8 check should be done first, but that would
87521e16 HG	343	* be a behavior change, which may causes issues.
c3d6de69	344	*/
87521e16	345	enum acpi_backlight_type acpi_video_get_backlight_type(void)
c3d6de69	346	{
87521e16 HG	347	static DEFINE_MUTEX(init_mutex);
	348	static bool init_done;
	349	static long video_caps;
084940d5	350
87521e16 HG	351	/* Parse cmdline, dmi and acpi only once */
	352	mutex_lock(&init_mutex);
	353	if (!init_done) {
	354	acpi_video_parse_cmdline();
084940d5	355	dmi_check_system(video_detect_dmi_table);
87521e16	356	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	357	ACPI_UINT32_MAX, find_video, NULL,
87521e16	358	&video_caps, NULL);
7231ed1a HG	359	INIT_WORK(&backlight_notify_work,
7231ed1a HG	360	acpi_video_backlight_notify_work);
93a291df HG	361	backlight_nb.notifier_call = acpi_video_backlight_notify;
	362	backlight_nb.priority = 0;
	363	if (backlight_register_notifier(&backlight_nb) == 0)
	364	backlight_notifier_registered = true;
87521e16	365	init_done = true;
c3d6de69	366	}
87521e16 HG	367	mutex_unlock(&init_mutex);
	368
	369	if (acpi_backlight_cmdline != acpi_backlight_undef)
	370	return acpi_backlight_cmdline;
	371
	372	if (acpi_backlight_dmi != acpi_backlight_undef)
	373	return acpi_backlight_dmi;
	374
	375	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
	376	return acpi_backlight_vendor;
	377
01c3664d	378	if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
87521e16 HG	379	return acpi_backlight_native;
	380
	381	return acpi_backlight_video;
c3d6de69	382	}
87521e16	383	EXPORT_SYMBOL(acpi_video_get_backlight_type);
c3d6de69	384
87521e16 HG	385	/*
	386	* Set the preferred backlight interface type based on DMI info.
	387	* This function allows DMI blacklists to be implemented by external
	388	* platform drivers instead of putting a big blacklist in video_detect.c
	389	*/
	390	void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
c3d6de69	391	{
87521e16	392	acpi_backlight_dmi = type;
5fd677b7 HG	393	/* Remove acpi-video backlight interface if it is no longer desired */
	394	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	395	acpi_video_unregister_backlight();
f838eb5b	396	}
87521e16	397	EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
f838eb5b	398
93a291df HG	399	void __exit acpi_video_detect_exit(void)
	400	{
	401	if (backlight_notifier_registered)
	402	backlight_unregister_notifier(&backlight_nb);
	403	}