[linux-2.6-block.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 int video_detect_force_none(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_none;
	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) until 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"),
		},
	},
	{
	.callback = video_detect_force_vendor,
	.ident = "Sony VPCEH3U1E",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
		},
	},

	/*
	 * 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=1557060 */
	 .callback = video_detect_force_video,
	 .ident = "SAMSUNG 670Z5E",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
		},
	},
	{
	 /* 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"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 .ident = "Dell Precision 7510",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
		},
	},
	{
	 .callback = video_detect_force_none,
	 .ident = "Dell OptiPlex 9020M",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
		},
	},
	{ },
};

/* 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
1f59ab27 AH	106	static int video_detect_force_none(const struct dmi_system_id *d)
	107	{
	108	acpi_backlight_dmi = acpi_backlight_none;
	109	return 0;
	110	}
	111
4a4f01a6	112	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	113	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
084940d5 CC	114	* ACPI backlight device is used. This flag will definitively break
603fadf3	115	* the backlight interface (even the vendor interface) until next
084940d5 CC	116	* reboot. It's why we should prevent video.ko from being used here
	117	* and we can't rely on a later call to acpi_video_unregister().
	118	*/
	119	{
	120	.callback = video_detect_force_vendor,
	121	.ident = "X360",
	122	.matches = {
	123	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	124	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	125	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	126	},
	127	},
d0c2ce16 LT	128	{
	129	.callback = video_detect_force_vendor,
	130	.ident = "Asus UL30VT",
	131	.matches = {
	132	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	133	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	134	},
	135	},
c8f6d835 BT	136	{
	137	.callback = video_detect_force_vendor,
	138	.ident = "Asus UL30A",
	139	.matches = {
	140	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	141	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	142	},
	143	},
aefa763b ZR	144	{
	145	.callback = video_detect_force_vendor,
	146	.ident = "Sony VPCEH3U1E",
	147	.matches = {
	148	DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
	149	DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
	150	},
	151	},
3bd6bce3 HG	152
	153	/*
	154	* These models have a working acpi_video backlight control, and using
	155	* native backlight causes a regression where backlight does not work
	156	* when userspace is not handling brightness key events. Disable
	157	* native_backlight on these to fix this:
	158	* https://bugzilla.kernel.org/show_bug.cgi?id=81691
	159	*/
	160	{
	161	.callback = video_detect_force_video,
	162	.ident = "ThinkPad T420",
	163	.matches = {
	164	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	165	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
	166	},
	167	},
	168	{
	169	.callback = video_detect_force_video,
	170	.ident = "ThinkPad T520",
	171	.matches = {
	172	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	173	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
	174	},
	175	},
	176	{
	177	.callback = video_detect_force_video,
	178	.ident = "ThinkPad X201s",
	179	.matches = {
	180	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	181	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
	182	},
	183	},
007d94ca RG	184	{
	185	.callback = video_detect_force_video,
	186	.ident = "ThinkPad X201T",
	187	.matches = {
	188	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	189	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
	190	},
	191	},
3bd6bce3 HG	192
	193	/* The native backlight controls do not work on some older machines */
	194	{
	195	/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	196	.callback = video_detect_force_video,
	197	.ident = "HP ENVY 15 Notebook",
	198	.matches = {
	199	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	200	DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
	201	},
	202	},
	203	{
	204	.callback = video_detect_force_video,
	205	.ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
	206	.matches = {
	207	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	208	DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
	209	},
	210	},
	211	{
	212	.callback = video_detect_force_video,
	213	.ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
	214	.matches = {
	215	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	216	DMI_MATCH(DMI_PRODUCT_NAME,
	217	"370R4E/370R4V/370R5E/3570RE/370R5V"),
	218	},
	219	},
	220	{
	221	/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	222	.callback = video_detect_force_video,
	223	.ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
	224	.matches = {
	225	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	226	DMI_MATCH(DMI_PRODUCT_NAME,
	227	"3570R/370R/470R/450R/510R/4450RV"),
	228	},
	229	},
bbf03861 HG	230	{
	231	/* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
	232	.callback = video_detect_force_video,
	233	.ident = "SAMSUNG 670Z5E",
	234	.matches = {
	235	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	236	DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
	237	},
	238	},
3bd6bce3 HG	239	{
	240	/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
	241	.callback = video_detect_force_video,
	242	.ident = "SAMSUNG 730U3E/740U3E",
	243	.matches = {
	244	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	245	DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
	246	},
	247	},
	248	{
	249	/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
	250	.callback = video_detect_force_video,
	251	.ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
	252	.matches = {
	253	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	254	DMI_MATCH(DMI_PRODUCT_NAME,
	255	"900X3C/900X3D/900X3E/900X4C/900X4D"),
	256	},
	257	},
61f9738d HG	258	{
	259	/* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
	260	.callback = video_detect_force_video,
	261	.ident = "Dell XPS14 L421X",
	262	.matches = {
	263	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	264	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
	265	},
	266	},
3bd6bce3 HG	267	{
	268	/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
	269	.callback = video_detect_force_video,
	270	.ident = "Dell XPS15 L521X",
	271	.matches = {
	272	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	273	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
	274	},
	275	},
49eb5208 AL	276	{
	277	/* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
	278	.callback = video_detect_force_video,
	279	.ident = "SAMSUNG 530U4E/540U4E",
	280	.matches = {
	281	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	282	DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
	283	},
	284	},
3bd6bce3 HG	285
3bd6bce3 HG	286	/* Non win8 machines which need native backlight nevertheless */
584d8d1e HG	287	{
	288	/* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
	289	.callback = video_detect_force_native,
	290	.ident = "Lenovo Ideapad S405",
	291	.matches = {
	292	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	293	DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
	294	},
	295	},
3bd6bce3 HG	296	{
	297	/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
	298	.callback = video_detect_force_native,
	299	.ident = "Lenovo Ideapad Z570",
	300	.matches = {
	301	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	302	DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
	303	},
	304	},
	305	{
	306	/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
	307	.callback = video_detect_force_native,
	308	.ident = "Apple MacBook Pro 12,1",
	309	.matches = {
	310	DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
	311	DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
	312	},
	313	},
4b4b3b20 HG	314	{
	315	.callback = video_detect_force_native,
	316	.ident = "Dell Vostro V131",
	317	.matches = {
	318	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	319	DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
	320	},
	321	},
350fa038 HG	322	{
	323	/* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
	324	.callback = video_detect_force_native,
	325	.ident = "Dell XPS 17 L702X",
	326	.matches = {
	327	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	328	DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
	329	},
	330	},
d37efb79 SYLF	331	{
	332	.callback = video_detect_force_native,
	333	.ident = "Dell Precision 7510",
	334	.matches = {
	335	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	336	DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
	337	},
	338	},
1f59ab27 AH	339	{
	340	.callback = video_detect_force_none,
	341	.ident = "Dell OptiPlex 9020M",
	342	.matches = {
	343	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	344	DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
	345	},
	346	},
084940d5 CC	347	{ },
	348	};
	349
7231ed1a HG	350	/* This uses a workqueue to avoid various locking ordering issues */
	351	static void acpi_video_backlight_notify_work(struct work_struct *work)
	352	{
	353	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	354	acpi_video_unregister_backlight();
	355	}
	356
93a291df HG	357	static int acpi_video_backlight_notify(struct notifier_block *nb,
	358	unsigned long val, void *bd)
	359	{
	360	struct backlight_device *backlight = bd;
	361
	362	/* A raw bl registering may change video -> native */
	363	if (backlight->props.type == BACKLIGHT_RAW &&
7231ed1a HG	364	val == BACKLIGHT_REGISTERED)
7231ed1a HG	365	schedule_work(&backlight_notify_work);
93a291df HG	366
	367	return NOTIFY_OK;
	368	}
	369
c3d6de69	370	/*
87521e16 HG	371	* Determine which type of backlight interface to use on this system,
	372	* First check cmdline, then dmi quirks, then do autodetect.
	373	*
	374	* The autodetect order is:
	375	* 1) Is the acpi-video backlight interface supported ->
	376	* no, use a vendor interface
	377	* 2) Is this a win8 "ready" BIOS and do we have a native interface ->
	378	* yes, use a native interface
	379	* 3) Else use the acpi-video interface
c3d6de69	380	*
87521e16 HG	381	* Arguably the native on win8 check should be done first, but that would
87521e16 HG	382	* be a behavior change, which may causes issues.
c3d6de69	383	*/
87521e16	384	enum acpi_backlight_type acpi_video_get_backlight_type(void)
c3d6de69	385	{
87521e16 HG	386	static DEFINE_MUTEX(init_mutex);
	387	static bool init_done;
	388	static long video_caps;
084940d5	389
87521e16 HG	390	/* Parse cmdline, dmi and acpi only once */
	391	mutex_lock(&init_mutex);
	392	if (!init_done) {
	393	acpi_video_parse_cmdline();
084940d5	394	dmi_check_system(video_detect_dmi_table);
87521e16	395	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	396	ACPI_UINT32_MAX, find_video, NULL,
87521e16	397	&video_caps, NULL);
7231ed1a HG	398	INIT_WORK(&backlight_notify_work,
7231ed1a HG	399	acpi_video_backlight_notify_work);
93a291df HG	400	backlight_nb.notifier_call = acpi_video_backlight_notify;
	401	backlight_nb.priority = 0;
	402	if (backlight_register_notifier(&backlight_nb) == 0)
	403	backlight_notifier_registered = true;
87521e16	404	init_done = true;
c3d6de69	405	}
87521e16 HG	406	mutex_unlock(&init_mutex);
	407
	408	if (acpi_backlight_cmdline != acpi_backlight_undef)
	409	return acpi_backlight_cmdline;
	410
	411	if (acpi_backlight_dmi != acpi_backlight_undef)
	412	return acpi_backlight_dmi;
	413
	414	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
	415	return acpi_backlight_vendor;
	416
01c3664d	417	if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
87521e16 HG	418	return acpi_backlight_native;
	419
	420	return acpi_backlight_video;
c3d6de69	421	}
87521e16	422	EXPORT_SYMBOL(acpi_video_get_backlight_type);
c3d6de69	423
87521e16 HG	424	/*
	425	* Set the preferred backlight interface type based on DMI info.
	426	* This function allows DMI blacklists to be implemented by external
	427	* platform drivers instead of putting a big blacklist in video_detect.c
	428	*/
	429	void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
c3d6de69	430	{
87521e16	431	acpi_backlight_dmi = type;
5fd677b7 HG	432	/* Remove acpi-video backlight interface if it is no longer desired */
	433	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	434	acpi_video_unregister_backlight();
f838eb5b	435	}
87521e16	436	EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
f838eb5b	437
93a291df HG	438	void __exit acpi_video_detect_exit(void)
	439	{
	440	if (backlight_notifier_registered)
	441	backlight_unregister_notifier(&backlight_nb);
	442	}