[deliverable/linux.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 <acpi/video.h>

ACPI_MODULE_NAME("video");
#define _COMPONENT		ACPI_VIDEO_COMPONENT

static bool backlight_notifier_registered;
static struct notifier_block backlight_nb;

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"),
		},
	},
	{
	.callback = video_detect_force_vendor,
	.ident = "Dell Inspiron 5737",
	.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
		},
	},

	/*
	 * 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"),
		},
	},

	/* 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=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"),
		},
	},

	/* Non win8 machines which need native backlight nevertheless */
	{
	 /* 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"),
		},
	},
	{ },
};

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 &&
	    acpi_video_get_backlight_type() != acpi_backlight_video)
		acpi_video_unregister_backlight();

	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);
		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_registered(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 HG	34	#include <linux/types.h>
87521e16 HG	35	#include <acpi/video.h>
c3d6de69 TR	36
c3d6de69 TR	37	ACPI_MODULE_NAME("video");
c3d6de69 TR	38	#define _COMPONENT ACPI_VIDEO_COMPONENT
c3d6de69 TR	39
93a291df HG	40	static bool backlight_notifier_registered;
	41	static struct notifier_block backlight_nb;
	42
87521e16 HG	43	static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
87521e16 HG	44	static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
c3d6de69	45
14ca7a47 HG	46	static void acpi_video_parse_cmdline(void)
	47	{
	48	if (!strcmp("vendor", acpi_video_backlight_string))
87521e16	49	acpi_backlight_cmdline = acpi_backlight_vendor;
14ca7a47	50	if (!strcmp("video", acpi_video_backlight_string))
87521e16 HG	51	acpi_backlight_cmdline = acpi_backlight_video;
	52	if (!strcmp("native", acpi_video_backlight_string))
	53	acpi_backlight_cmdline = acpi_backlight_native;
	54	if (!strcmp("none", acpi_video_backlight_string))
	55	acpi_backlight_cmdline = acpi_backlight_none;
14ca7a47 HG	56	}
14ca7a47 HG	57
c3d6de69 TR	58	static acpi_status
	59	find_video(acpi_handle handle, u32 lvl, void context, void *rv)
	60	{
	61	long *cap = context;
1e4cffe7	62	struct pci_dev *dev;
c3d6de69 TR	63	struct acpi_device *acpi_dev;
c3d6de69 TR	64
4a4f01a6	65	static const struct acpi_device_id video_ids[] = {
c3d6de69 TR	66	{ACPI_VIDEO_HID, 0},
	67	{"", 0},
	68	};
	69	if (acpi_bus_get_device(handle, &acpi_dev))
	70	return AE_OK;
	71
	72	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
1e4cffe7	73	dev = acpi_get_pci_dev(handle);
c3d6de69 TR	74	if (!dev)
c3d6de69 TR	75	return AE_OK;
1e4cffe7	76	pci_dev_put(dev);
d4e1a692	77	*cap \|= acpi_is_video_device(handle);
c3d6de69 TR	78	}
	79	return AE_OK;
	80	}
	81
084940d5 CC	82	/* Force to use vendor driver when the ACPI device is known to be
	83	* buggy */
	84	static int video_detect_force_vendor(const struct dmi_system_id *d)
	85	{
87521e16	86	acpi_backlight_dmi = acpi_backlight_vendor;
084940d5 CC	87	return 0;
	88	}
	89
3bd6bce3 HG	90	static int video_detect_force_video(const struct dmi_system_id *d)
	91	{
	92	acpi_backlight_dmi = acpi_backlight_video;
	93	return 0;
	94	}
	95
	96	static int video_detect_force_native(const struct dmi_system_id *d)
	97	{
	98	acpi_backlight_dmi = acpi_backlight_native;
	99	return 0;
	100	}
	101
4a4f01a6	102	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	103	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	104	* ACPI backlight device is used. This flag will definitively break
	105	* the backlight interface (even the vendor interface) untill next
	106	* reboot. It's why we should prevent video.ko from being used here
	107	* and we can't rely on a later call to acpi_video_unregister().
	108	*/
	109	{
	110	.callback = video_detect_force_vendor,
	111	.ident = "X360",
	112	.matches = {
	113	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	114	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	115	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	116	},
	117	},
d0c2ce16 LT	118	{
	119	.callback = video_detect_force_vendor,
	120	.ident = "Asus UL30VT",
	121	.matches = {
	122	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	123	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	124	},
	125	},
c8f6d835 BT	126	{
	127	.callback = video_detect_force_vendor,
	128	.ident = "Asus UL30A",
	129	.matches = {
	130	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	131	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	132	},
	133	},
08a56226 EL	134	{
	135	.callback = video_detect_force_vendor,
	136	.ident = "Dell Inspiron 5737",
	137	.matches = {
	138	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	139	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
	140	},
	141	},
3bd6bce3 HG	142
	143	/*
	144	* These models have a working acpi_video backlight control, and using
	145	* native backlight causes a regression where backlight does not work
	146	* when userspace is not handling brightness key events. Disable
	147	* native_backlight on these to fix this:
	148	* https://bugzilla.kernel.org/show_bug.cgi?id=81691
	149	*/
	150	{
	151	.callback = video_detect_force_video,
	152	.ident = "ThinkPad T420",
	153	.matches = {
	154	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	155	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
	156	},
	157	},
	158	{
	159	.callback = video_detect_force_video,
	160	.ident = "ThinkPad T520",
	161	.matches = {
	162	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	163	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
	164	},
	165	},
	166	{
	167	.callback = video_detect_force_video,
	168	.ident = "ThinkPad X201s",
	169	.matches = {
	170	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	171	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
	172	},
	173	},
	174
	175	/* The native backlight controls do not work on some older machines */
	176	{
	177	/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	178	.callback = video_detect_force_video,
	179	.ident = "HP ENVY 15 Notebook",
	180	.matches = {
	181	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	182	DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
	183	},
	184	},
	185	{
	186	.callback = video_detect_force_video,
	187	.ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
	188	.matches = {
	189	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	190	DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
	191	},
	192	},
	193	{
	194	.callback = video_detect_force_video,
	195	.ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
	196	.matches = {
	197	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	198	DMI_MATCH(DMI_PRODUCT_NAME,
	199	"370R4E/370R4V/370R5E/3570RE/370R5V"),
	200	},
	201	},
	202	{
	203	/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	204	.callback = video_detect_force_video,
	205	.ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
206	.matches = {
207	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
208	DMI_MATCH(DMI_PRODUCT_NAME,
209	"3570R/370R/470R/450R/510R/4450RV"),
210	},
211	},
212	{
213	/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
214	.callback = video_detect_force_video,
215	.ident = "SAMSUNG 730U3E/740U3E",
216	.matches = {
217	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
218	DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
219	},
220	},
221	{
222	/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
223	.callback = video_detect_force_video,
224	.ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
225	.matches = {
226	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
227	DMI_MATCH(DMI_PRODUCT_NAME,
228	"900X3C/900X3D/900X3E/900X4C/900X4D"),
229	},
230	},
231	{
232	/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
233	.callback = video_detect_force_video,
234	.ident = "Dell XPS15 L521X",
235	.matches = {
236	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
238	},
239	},
240
241	/* Non win8 machines which need native backlight nevertheless */
242	{
243	/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
244	.callback = video_detect_force_native,
245	.ident = "Lenovo Ideapad Z570",
246	.matches = {
247	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
248	DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
249	},
250	},
251	{
252	/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
253	.callback = video_detect_force_native,
254	.ident = "Apple MacBook Pro 12,1",
255	.matches = {
256	DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
257	DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
258	},
259	},
084940d5 CC	260	{ },
	261	};
	262
93a291df HG	263	static int acpi_video_backlight_notify(struct notifier_block *nb,
	264	unsigned long val, void *bd)
	265	{
	266	struct backlight_device *backlight = bd;
	267
	268	/* A raw bl registering may change video -> native */
	269	if (backlight->props.type == BACKLIGHT_RAW &&
	270	val == BACKLIGHT_REGISTERED &&
	271	acpi_video_get_backlight_type() != acpi_backlight_video)
	272	acpi_video_unregister_backlight();
	273
	274	return NOTIFY_OK;
	275	}
	276
c3d6de69	277	/*
87521e16 HG	278	* Determine which type of backlight interface to use on this system,
	279	* First check cmdline, then dmi quirks, then do autodetect.
	280	*
	281	* The autodetect order is:
	282	* 1) Is the acpi-video backlight interface supported ->
	283	* no, use a vendor interface
	284	* 2) Is this a win8 "ready" BIOS and do we have a native interface ->
	285	* yes, use a native interface
	286	* 3) Else use the acpi-video interface
c3d6de69	287	*
87521e16 HG	288	* Arguably the native on win8 check should be done first, but that would
87521e16 HG	289	* be a behavior change, which may causes issues.
c3d6de69	290	*/
87521e16	291	enum acpi_backlight_type acpi_video_get_backlight_type(void)
c3d6de69	292	{
87521e16 HG	293	static DEFINE_MUTEX(init_mutex);
	294	static bool init_done;
	295	static long video_caps;
084940d5	296
87521e16 HG	297	/* Parse cmdline, dmi and acpi only once */
	298	mutex_lock(&init_mutex);
	299	if (!init_done) {
	300	acpi_video_parse_cmdline();
084940d5	301	dmi_check_system(video_detect_dmi_table);
87521e16	302	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	303	ACPI_UINT32_MAX, find_video, NULL,
87521e16	304	&video_caps, NULL);
93a291df HG	305	backlight_nb.notifier_call = acpi_video_backlight_notify;
	306	backlight_nb.priority = 0;
	307	if (backlight_register_notifier(&backlight_nb) == 0)
	308	backlight_notifier_registered = true;
87521e16	309	init_done = true;
c3d6de69	310	}
87521e16 HG	311	mutex_unlock(&init_mutex);
	312
	313	if (acpi_backlight_cmdline != acpi_backlight_undef)
	314	return acpi_backlight_cmdline;
	315
	316	if (acpi_backlight_dmi != acpi_backlight_undef)
	317	return acpi_backlight_dmi;
	318
	319	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
	320	return acpi_backlight_vendor;
	321
	322	if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW))
	323	return acpi_backlight_native;
	324
	325	return acpi_backlight_video;
c3d6de69	326	}
87521e16	327	EXPORT_SYMBOL(acpi_video_get_backlight_type);
c3d6de69	328
87521e16 HG	329	/*
	330	* Set the preferred backlight interface type based on DMI info.
	331	* This function allows DMI blacklists to be implemented by external
	332	* platform drivers instead of putting a big blacklist in video_detect.c
	333	*/
	334	void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
c3d6de69	335	{
87521e16	336	acpi_backlight_dmi = type;
5fd677b7 HG	337	/* Remove acpi-video backlight interface if it is no longer desired */
	338	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	339	acpi_video_unregister_backlight();
f838eb5b	340	}
87521e16	341	EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
f838eb5b	342
93a291df HG	343	void __exit acpi_video_detect_exit(void)
	344	{
	345	if (backlight_notifier_registered)
	346	backlight_unregister_notifier(&backlight_nb);
	347	}