[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 <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 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
e7d024c0 HG	40	void acpi_video_unregister_backlight(void);
e7d024c0 HG	41
93a291df HG	42	static bool backlight_notifier_registered;
	43	static struct notifier_block backlight_nb;
	44
87521e16 HG	45	static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
87521e16 HG	46	static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
c3d6de69	47
14ca7a47 HG	48	static void acpi_video_parse_cmdline(void)
	49	{
	50	if (!strcmp("vendor", acpi_video_backlight_string))
87521e16	51	acpi_backlight_cmdline = acpi_backlight_vendor;
14ca7a47	52	if (!strcmp("video", acpi_video_backlight_string))
87521e16 HG	53	acpi_backlight_cmdline = acpi_backlight_video;
	54	if (!strcmp("native", acpi_video_backlight_string))
	55	acpi_backlight_cmdline = acpi_backlight_native;
	56	if (!strcmp("none", acpi_video_backlight_string))
	57	acpi_backlight_cmdline = acpi_backlight_none;
14ca7a47 HG	58	}
14ca7a47 HG	59
c3d6de69 TR	60	static acpi_status
	61	find_video(acpi_handle handle, u32 lvl, void context, void *rv)
	62	{
	63	long *cap = context;
1e4cffe7	64	struct pci_dev *dev;
c3d6de69 TR	65	struct acpi_device *acpi_dev;
c3d6de69 TR	66
4a4f01a6	67	static const struct acpi_device_id video_ids[] = {
c3d6de69 TR	68	{ACPI_VIDEO_HID, 0},
	69	{"", 0},
	70	};
	71	if (acpi_bus_get_device(handle, &acpi_dev))
	72	return AE_OK;
	73
	74	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
1e4cffe7	75	dev = acpi_get_pci_dev(handle);
c3d6de69 TR	76	if (!dev)
c3d6de69 TR	77	return AE_OK;
1e4cffe7	78	pci_dev_put(dev);
d4e1a692	79	*cap \|= acpi_is_video_device(handle);
c3d6de69 TR	80	}
	81	return AE_OK;
	82	}
	83
084940d5 CC	84	/* Force to use vendor driver when the ACPI device is known to be
	85	* buggy */
	86	static int video_detect_force_vendor(const struct dmi_system_id *d)
	87	{
87521e16	88	acpi_backlight_dmi = acpi_backlight_vendor;
084940d5 CC	89	return 0;
	90	}
	91
3bd6bce3 HG	92	static int video_detect_force_video(const struct dmi_system_id *d)
	93	{
	94	acpi_backlight_dmi = acpi_backlight_video;
	95	return 0;
	96	}
	97
	98	static int video_detect_force_native(const struct dmi_system_id *d)
	99	{
	100	acpi_backlight_dmi = acpi_backlight_native;
	101	return 0;
	102	}
	103
4a4f01a6	104	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	105	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	106	* ACPI backlight device is used. This flag will definitively break
	107	* the backlight interface (even the vendor interface) untill next
	108	* reboot. It's why we should prevent video.ko from being used here
	109	* and we can't rely on a later call to acpi_video_unregister().
	110	*/
	111	{
	112	.callback = video_detect_force_vendor,
	113	.ident = "X360",
	114	.matches = {
	115	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	116	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	117	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	118	},
	119	},
d0c2ce16 LT	120	{
	121	.callback = video_detect_force_vendor,
	122	.ident = "Asus UL30VT",
	123	.matches = {
	124	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	125	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	126	},
	127	},
c8f6d835 BT	128	{
	129	.callback = video_detect_force_vendor,
	130	.ident = "Asus UL30A",
	131	.matches = {
	132	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	133	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	134	},
	135	},
08a56226 EL	136	{
	137	.callback = video_detect_force_vendor,
	138	.ident = "Dell Inspiron 5737",
	139	.matches = {
	140	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	141	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
	142	},
	143	},
3bd6bce3 HG	144
	145	/*
	146	* These models have a working acpi_video backlight control, and using
	147	* native backlight causes a regression where backlight does not work
	148	* when userspace is not handling brightness key events. Disable
	149	* native_backlight on these to fix this:
	150	* https://bugzilla.kernel.org/show_bug.cgi?id=81691
	151	*/
	152	{
	153	.callback = video_detect_force_video,
	154	.ident = "ThinkPad T420",
	155	.matches = {
	156	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	157	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
	158	},
	159	},
	160	{
	161	.callback = video_detect_force_video,
	162	.ident = "ThinkPad T520",
	163	.matches = {
	164	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	165	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
	166	},
	167	},
	168	{
	169	.callback = video_detect_force_video,
	170	.ident = "ThinkPad X201s",
	171	.matches = {
	172	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	173	DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
	174	},
	175	},
	176
	177	/* The native backlight controls do not work on some older machines */
	178	{
	179	/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	180	.callback = video_detect_force_video,
	181	.ident = "HP ENVY 15 Notebook",
	182	.matches = {
	183	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	184	DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
	185	},
	186	},
	187	{
	188	.callback = video_detect_force_video,
	189	.ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
	190	.matches = {
	191	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	192	DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
	193	},
	194	},
	195	{
	196	.callback = video_detect_force_video,
	197	.ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
	198	.matches = {
	199	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	200	DMI_MATCH(DMI_PRODUCT_NAME,
	201	"370R4E/370R4V/370R5E/3570RE/370R5V"),
	202	},
	203	},
	204	{
	205	/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	206	.callback = video_detect_force_video,
	207	.ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
208	.matches = {
209	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
210	DMI_MATCH(DMI_PRODUCT_NAME,
211	"3570R/370R/470R/450R/510R/4450RV"),
212	},
213	},
214	{
215	/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
216	.callback = video_detect_force_video,
217	.ident = "SAMSUNG 730U3E/740U3E",
218	.matches = {
219	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
220	DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
221	},
222	},
223	{
224	/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
225	.callback = video_detect_force_video,
226	.ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
227	.matches = {
228	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229	DMI_MATCH(DMI_PRODUCT_NAME,
230	"900X3C/900X3D/900X3E/900X4C/900X4D"),
231	},
232	},
233	{
234	/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
235	.callback = video_detect_force_video,
236	.ident = "Dell XPS15 L521X",
237	.matches = {
238	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
239	DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
240	},
241	},
242
243	/* Non win8 machines which need native backlight nevertheless */
244	{
245	/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
246	.callback = video_detect_force_native,
247	.ident = "Lenovo Ideapad Z570",
248	.matches = {
249	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
250	DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
251	},
252	},
253	{
254	/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
255	.callback = video_detect_force_native,
256	.ident = "Apple MacBook Pro 12,1",
257	.matches = {
258	DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
259	DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
260	},
261	},
084940d5 CC	262	{ },
	263	};
	264
93a291df HG	265	static int acpi_video_backlight_notify(struct notifier_block *nb,
	266	unsigned long val, void *bd)
	267	{
	268	struct backlight_device *backlight = bd;
	269
	270	/* A raw bl registering may change video -> native */
	271	if (backlight->props.type == BACKLIGHT_RAW &&
	272	val == BACKLIGHT_REGISTERED &&
	273	acpi_video_get_backlight_type() != acpi_backlight_video)
	274	acpi_video_unregister_backlight();
	275
	276	return NOTIFY_OK;
	277	}
	278
c3d6de69	279	/*
87521e16 HG	280	* Determine which type of backlight interface to use on this system,
	281	* First check cmdline, then dmi quirks, then do autodetect.
	282	*
	283	* The autodetect order is:
	284	* 1) Is the acpi-video backlight interface supported ->
	285	* no, use a vendor interface
	286	* 2) Is this a win8 "ready" BIOS and do we have a native interface ->
	287	* yes, use a native interface
	288	* 3) Else use the acpi-video interface
c3d6de69	289	*
87521e16 HG	290	* Arguably the native on win8 check should be done first, but that would
87521e16 HG	291	* be a behavior change, which may causes issues.
c3d6de69	292	*/
87521e16	293	enum acpi_backlight_type acpi_video_get_backlight_type(void)
c3d6de69	294	{
87521e16 HG	295	static DEFINE_MUTEX(init_mutex);
	296	static bool init_done;
	297	static long video_caps;
084940d5	298
87521e16 HG	299	/* Parse cmdline, dmi and acpi only once */
	300	mutex_lock(&init_mutex);
	301	if (!init_done) {
	302	acpi_video_parse_cmdline();
084940d5	303	dmi_check_system(video_detect_dmi_table);
87521e16	304	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	305	ACPI_UINT32_MAX, find_video, NULL,
87521e16	306	&video_caps, NULL);
93a291df HG	307	backlight_nb.notifier_call = acpi_video_backlight_notify;
	308	backlight_nb.priority = 0;
	309	if (backlight_register_notifier(&backlight_nb) == 0)
	310	backlight_notifier_registered = true;
87521e16	311	init_done = true;
c3d6de69	312	}
87521e16 HG	313	mutex_unlock(&init_mutex);
	314
	315	if (acpi_backlight_cmdline != acpi_backlight_undef)
	316	return acpi_backlight_cmdline;
	317
	318	if (acpi_backlight_dmi != acpi_backlight_undef)
	319	return acpi_backlight_dmi;
	320
	321	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
	322	return acpi_backlight_vendor;
	323
	324	if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW))
	325	return acpi_backlight_native;
	326
	327	return acpi_backlight_video;
c3d6de69	328	}
87521e16	329	EXPORT_SYMBOL(acpi_video_get_backlight_type);
c3d6de69	330
87521e16 HG	331	/*
	332	* Set the preferred backlight interface type based on DMI info.
	333	* This function allows DMI blacklists to be implemented by external
	334	* platform drivers instead of putting a big blacklist in video_detect.c
	335	*/
	336	void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
c3d6de69	337	{
87521e16	338	acpi_backlight_dmi = type;
5fd677b7 HG	339	/* Remove acpi-video backlight interface if it is no longer desired */
	340	if (acpi_video_get_backlight_type() != acpi_backlight_video)
	341	acpi_video_unregister_backlight();
f838eb5b	342	}
87521e16	343	EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
f838eb5b	344
93a291df HG	345	void __exit acpi_video_detect_exit(void)
	346	{
	347	if (backlight_notifier_registered)
	348	backlight_unregister_notifier(&backlight_nb);
	349	}