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

/*
 *  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
 *
 * Now acpi_video_get_capabilities() can be called to check which
 * capabilities the graphics cards plugged in support. The check for general
 * video capabilities will be triggered by the first caller of
 * acpi_video_get_capabilities(NULL); which will happen when the first
 * backlight switching supporting driver calls:
 * acpi_video_backlight_support();
 *
 * 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.
 *
 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
 * this file will not be compiled, acpi_video_get_capabilities() and
 * acpi_video_backlight_support() will always return 0 and vendor specific
 * drivers always can handle backlight.
 *
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>

ACPI_MODULE_NAME("video");
#define _COMPONENT		ACPI_VIDEO_COMPONENT

static long acpi_video_support;
static bool acpi_video_caps_checked;

static void acpi_video_parse_cmdline(void)
{
	if (!strcmp("vendor", acpi_video_backlight_string))
		acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
	if (!strcmp("video", acpi_video_backlight_string))
		acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
}

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_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	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"),
		},
	},
	{ },
};

/*
 * Returns the video capabilities of a specific ACPI graphics device
 *
 * if NULL is passed as argument all ACPI devices are enumerated and
 * all graphics capabilities of physically present devices are
 * summarized and returned. This is cached and done only once.
 */
static long acpi_video_get_capabilities(acpi_handle graphics_handle)
{
	long caps = 0;
	struct acpi_device *tmp_dev;
	acpi_status status;

	if (acpi_video_caps_checked && graphics_handle == NULL)
		return acpi_video_support;

	if (!graphics_handle) {
		/* Only do the global walk through all graphics devices once */
		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
				    ACPI_UINT32_MAX, find_video, NULL,
				    &caps, NULL);
		/* There might be boot param flags set already... */
		acpi_video_support |= caps;
		acpi_video_caps_checked = 1;
		/* Add blacklists here. Be careful to use the right *DMI* bits
		 * to still be able to override logic via boot params, e.g.:
		 *
		 *   if (dmi_name_in_vendors("XY")) {
		 *	acpi_video_support |=
		 *		ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
		 *}
		 */

		dmi_check_system(video_detect_dmi_table);
	} else {
		status = acpi_bus_get_device(graphics_handle, &tmp_dev);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
			return 0;
		}
		acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
				    ACPI_UINT32_MAX, find_video, NULL,
				    &caps, NULL);
	}
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
			  graphics_handle ? caps : acpi_video_support,
			  graphics_handle ? "on device " : "in general",
			  graphics_handle ? acpi_device_bid(tmp_dev) : ""));
	return caps;
}

static void acpi_video_caps_check(void)
{
	/*
	 * We must check whether the ACPI graphics device is physically plugged
	 * in. Therefore this must be called after binding PCI and ACPI devices
	 */
	if (!acpi_video_caps_checked) {
		acpi_video_parse_cmdline();
		acpi_video_get_capabilities(NULL);
	}
}

/* Promote the vendor interface instead of the generic video module.
 * This function allow DMI blacklists to be implemented by externals
 * platform drivers instead of putting a big blacklist in video_detect.c
 * After calling this function you will probably want to call
 * acpi_video_unregister() to make sure the video module is not loaded
 */
void acpi_video_dmi_promote_vendor(void)
{
	acpi_video_caps_check();
	acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
}
EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);

/* Returns true if video.ko can do backlight switching */
int acpi_video_backlight_support(void)
{
	acpi_video_caps_check();

	/* First check for boot param -> highest prio */
	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
		return 0;
	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
		return 1;

	/* Then check for DMI blacklist -> second highest prio */
	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
		return 0;
	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
		return 1;

	/* Then go the default way */
	return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
}
EXPORT_SYMBOL(acpi_video_backlight_support);
Commit	Line	Data
c3d6de69 TR	1	/*
	2	* Copyright (C) 2008 SuSE Linux Products GmbH
	3	* Thomas Renninger <trenn@suse.de>
	4	*
	5	* May be copied or modified under the terms of the GNU General Public License
	6	*
	7	* video_detect.c:
c3d6de69	8	* After PCI devices are glued with ACPI devices
1e4cffe7	9	* acpi_get_pci_dev() can be called to identify ACPI graphics
c3d6de69 TR	10	* devices for which a real graphics card is plugged in
	11	*
	12	* Now acpi_video_get_capabilities() can be called to check which
	13	* capabilities the graphics cards plugged in support. The check for general
	14	* video capabilities will be triggered by the first caller of
	15	* acpi_video_get_capabilities(NULL); which will happen when the first
677bd810	16	* backlight switching supporting driver calls:
c3d6de69 TR	17	* acpi_video_backlight_support();
	18	*
	19	* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
	20	* are available, video.ko should be used to handle the device.
	21	*
7ec48ced	22	* Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
677bd810	23	* sony_acpi,... can take care about backlight brightness.
c3d6de69 TR	24	*
	25	* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
	26	* this file will not be compiled, acpi_video_get_capabilities() and
	27	* acpi_video_backlight_support() will always return 0 and vendor specific
	28	* drivers always can handle backlight.
	29	*
	30	*/
	31
214f2c90	32	#include <linux/export.h>
c3d6de69 TR	33	#include <linux/acpi.h>
c3d6de69 TR	34	#include <linux/dmi.h>
14ca7a47	35	#include <linux/module.h>
1e4cffe7	36	#include <linux/pci.h>
c3d6de69 TR	37
c3d6de69 TR	38	ACPI_MODULE_NAME("video");
c3d6de69 TR	39	#define _COMPONENT ACPI_VIDEO_COMPONENT
	40
	41	static long acpi_video_support;
	42	static bool acpi_video_caps_checked;
	43
14ca7a47 HG	44	static void acpi_video_parse_cmdline(void)
	45	{
	46	if (!strcmp("vendor", acpi_video_backlight_string))
	47	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
	48	if (!strcmp("video", acpi_video_backlight_string))
	49	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
	50	}
	51
c3d6de69 TR	52	static acpi_status
	53	find_video(acpi_handle handle, u32 lvl, void context, void *rv)
	54	{
	55	long *cap = context;
1e4cffe7	56	struct pci_dev *dev;
c3d6de69 TR	57	struct acpi_device *acpi_dev;
c3d6de69 TR	58
4a4f01a6	59	static const struct acpi_device_id video_ids[] = {
c3d6de69 TR	60	{ACPI_VIDEO_HID, 0},
	61	{"", 0},
	62	};
	63	if (acpi_bus_get_device(handle, &acpi_dev))
	64	return AE_OK;
	65
	66	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
1e4cffe7	67	dev = acpi_get_pci_dev(handle);
c3d6de69 TR	68	if (!dev)
c3d6de69 TR	69	return AE_OK;
1e4cffe7	70	pci_dev_put(dev);
d4e1a692	71	*cap \|= acpi_is_video_device(handle);
c3d6de69 TR	72	}
	73	return AE_OK;
	74	}
	75
084940d5 CC	76	/* Force to use vendor driver when the ACPI device is known to be
	77	* buggy */
	78	static int video_detect_force_vendor(const struct dmi_system_id *d)
	79	{
	80	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	81	return 0;
	82	}
	83
4a4f01a6	84	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	85	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	86	* ACPI backlight device is used. This flag will definitively break
	87	* the backlight interface (even the vendor interface) untill next
	88	* reboot. It's why we should prevent video.ko from being used here
	89	* and we can't rely on a later call to acpi_video_unregister().
	90	*/
	91	{
	92	.callback = video_detect_force_vendor,
	93	.ident = "X360",
	94	.matches = {
	95	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	96	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	97	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	98	},
	99	},
d0c2ce16 LT	100	{
	101	.callback = video_detect_force_vendor,
	102	.ident = "Asus UL30VT",
	103	.matches = {
	104	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	105	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	106	},
	107	},
c8f6d835 BT	108	{
	109	.callback = video_detect_force_vendor,
	110	.ident = "Asus UL30A",
	111	.matches = {
	112	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	113	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	114	},
	115	},
08a56226 EL	116	{
	117	.callback = video_detect_force_vendor,
	118	.ident = "Dell Inspiron 5737",
	119	.matches = {
	120	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	121	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
	122	},
	123	},
084940d5 CC	124	{ },
	125	};
	126
c3d6de69 TR	127	/*
	128	* Returns the video capabilities of a specific ACPI graphics device
	129	*
	130	* if NULL is passed as argument all ACPI devices are enumerated and
	131	* all graphics capabilities of physically present devices are
94e2bd68	132	* summarized and returned. This is cached and done only once.
c3d6de69	133	*/
fb105d96	134	static long acpi_video_get_capabilities(acpi_handle graphics_handle)
c3d6de69 TR	135	{
	136	long caps = 0;
	137	struct acpi_device *tmp_dev;
	138	acpi_status status;
	139
	140	if (acpi_video_caps_checked && graphics_handle == NULL)
	141	return acpi_video_support;
	142
	143	if (!graphics_handle) {
	144	/* Only do the global walk through all graphics devices once */
	145	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	146	ACPI_UINT32_MAX, find_video, NULL,
c3d6de69 TR	147	&caps, NULL);
	148	/* There might be boot param flags set already... */
	149	acpi_video_support \|= caps;
	150	acpi_video_caps_checked = 1;
	151	/* Add blacklists here. Be careful to use the right DMI bits
	152	* to still be able to override logic via boot params, e.g.:
	153	*
	154	* if (dmi_name_in_vendors("XY")) {
	155	* acpi_video_support \|=
c3d6de69 TR	156	* ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	157	*}
	158	*/
084940d5 CC	159
084940d5 CC	160	dmi_check_system(video_detect_dmi_table);
c3d6de69 TR	161	} else {
	162	status = acpi_bus_get_device(graphics_handle, &tmp_dev);
	163	if (ACPI_FAILURE(status)) {
	164	ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
	165	return 0;
	166	}
	167	acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
2263576c	168	ACPI_UINT32_MAX, find_video, NULL,
c3d6de69 TR	169	&caps, NULL);
	170	}
	171	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
	172	graphics_handle ? caps : acpi_video_support,
	173	graphics_handle ? "on device " : "in general",
	174	graphics_handle ? acpi_device_bid(tmp_dev) : ""));
	175	return caps;
	176	}
c3d6de69	177
f838eb5b	178	static void acpi_video_caps_check(void)
c3d6de69 TR	179	{
	180	/*
	181	* We must check whether the ACPI graphics device is physically plugged
	182	* in. Therefore this must be called after binding PCI and ACPI devices
	183	*/
14ca7a47 HG	184	if (!acpi_video_caps_checked) {
14ca7a47 HG	185	acpi_video_parse_cmdline();
c3d6de69	186	acpi_video_get_capabilities(NULL);
14ca7a47	187	}
f838eb5b CC	188	}
	189
	190	/* Promote the vendor interface instead of the generic video module.
	191	* This function allow DMI blacklists to be implemented by externals
	192	* platform drivers instead of putting a big blacklist in video_detect.c
	193	* After calling this function you will probably want to call
	194	* acpi_video_unregister() to make sure the video module is not loaded
	195	*/
	196	void acpi_video_dmi_promote_vendor(void)
	197	{
	198	acpi_video_caps_check();
	199	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	200	}
	201	EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
	202
f838eb5b CC	203	/* Returns true if video.ko can do backlight switching */
	204	int acpi_video_backlight_support(void)
	205	{
	206	acpi_video_caps_check();
c3d6de69 TR	207
	208	/* First check for boot param -> highest prio */
	209	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
	210	return 0;
	211	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
	212	return 1;
	213
	214	/* Then check for DMI blacklist -> second highest prio */
	215	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
	216	return 0;
	217	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
	218	return 1;
	219
	220	/* Then go the default way */
	221	return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
	222	}
	223	EXPORT_SYMBOL(acpi_video_backlight_support);