[deliverable/linux.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/pci.h>

#include "internal.h"

ACPI_MODULE_NAME("video");
#define _COMPONENT		ACPI_VIDEO_COMPONENT

static long acpi_video_support;
static bool acpi_video_caps_checked;

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_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);

/*
 * Use acpi_backlight=vendor/video to force that backlight switching
 * is processed by vendor specific acpi drivers or video.ko driver.
 */
static int __init acpi_backlight(char *str)
{
	if (str == NULL || *str == '\0')
		return 1;
	else {
		if (!strcmp("vendor", str))
			acpi_video_support |=
				ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
		if (!strcmp("video", str))
			acpi_video_support |=
				ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
	}
	return 1;
}
__setup("acpi_backlight=", acpi_backlight);
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>
1e4cffe7	35	#include <linux/pci.h>
c3d6de69	36
8c5bd7ad RW	37	#include "internal.h"
8c5bd7ad RW	38
c3d6de69	39	ACPI_MODULE_NAME("video");
c3d6de69 TR	40	#define _COMPONENT ACPI_VIDEO_COMPONENT
	41
	42	static long acpi_video_support;
	43	static bool acpi_video_caps_checked;
	44
c3d6de69 TR	45	static acpi_status
	46	find_video(acpi_handle handle, u32 lvl, void context, void *rv)
	47	{
	48	long *cap = context;
1e4cffe7	49	struct pci_dev *dev;
c3d6de69 TR	50	struct acpi_device *acpi_dev;
c3d6de69 TR	51
4a4f01a6	52	static const struct acpi_device_id video_ids[] = {
c3d6de69 TR	53	{ACPI_VIDEO_HID, 0},
	54	{"", 0},
	55	};
	56	if (acpi_bus_get_device(handle, &acpi_dev))
	57	return AE_OK;
	58
	59	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
1e4cffe7	60	dev = acpi_get_pci_dev(handle);
c3d6de69 TR	61	if (!dev)
c3d6de69 TR	62	return AE_OK;
1e4cffe7	63	pci_dev_put(dev);
d4e1a692	64	*cap \|= acpi_is_video_device(handle);
c3d6de69 TR	65	}
	66	return AE_OK;
	67	}
	68
084940d5 CC	69	/* Force to use vendor driver when the ACPI device is known to be
	70	* buggy */
	71	static int video_detect_force_vendor(const struct dmi_system_id *d)
	72	{
	73	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	74	return 0;
	75	}
	76
4a4f01a6	77	static const struct dmi_system_id video_detect_dmi_table[] = {
084940d5 CC	78	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
	79	* ACPI backlight device is used. This flag will definitively break
	80	* the backlight interface (even the vendor interface) untill next
	81	* reboot. It's why we should prevent video.ko from being used here
	82	* and we can't rely on a later call to acpi_video_unregister().
	83	*/
	84	{
	85	.callback = video_detect_force_vendor,
	86	.ident = "X360",
	87	.matches = {
	88	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	89	DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
	90	DMI_MATCH(DMI_BOARD_NAME, "X360"),
	91	},
	92	},
d0c2ce16 LT	93	{
	94	.callback = video_detect_force_vendor,
	95	.ident = "Asus UL30VT",
	96	.matches = {
	97	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	98	DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
	99	},
	100	},
c8f6d835 BT	101	{
	102	.callback = video_detect_force_vendor,
	103	.ident = "Asus UL30A",
	104	.matches = {
	105	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
	106	DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
	107	},
	108	},
08a56226 EL	109	{
	110	.callback = video_detect_force_vendor,
	111	.ident = "Dell Inspiron 5737",
	112	.matches = {
	113	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	114	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
	115	},
	116	},
084940d5 CC	117	{ },
	118	};
	119
c3d6de69 TR	120	/*
	121	* Returns the video capabilities of a specific ACPI graphics device
	122	*
	123	* if NULL is passed as argument all ACPI devices are enumerated and
	124	* all graphics capabilities of physically present devices are
94e2bd68	125	* summarized and returned. This is cached and done only once.
c3d6de69	126	*/
fb105d96	127	static long acpi_video_get_capabilities(acpi_handle graphics_handle)
c3d6de69 TR	128	{
	129	long caps = 0;
	130	struct acpi_device *tmp_dev;
	131	acpi_status status;
	132
	133	if (acpi_video_caps_checked && graphics_handle == NULL)
	134	return acpi_video_support;
	135
	136	if (!graphics_handle) {
	137	/* Only do the global walk through all graphics devices once */
	138	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
2263576c	139	ACPI_UINT32_MAX, find_video, NULL,
c3d6de69 TR	140	&caps, NULL);
	141	/* There might be boot param flags set already... */
	142	acpi_video_support \|= caps;
	143	acpi_video_caps_checked = 1;
	144	/* Add blacklists here. Be careful to use the right DMI bits
	145	* to still be able to override logic via boot params, e.g.:
	146	*
	147	* if (dmi_name_in_vendors("XY")) {
	148	* acpi_video_support \|=
c3d6de69 TR	149	* ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	150	*}
	151	*/
084940d5 CC	152
084940d5 CC	153	dmi_check_system(video_detect_dmi_table);
c3d6de69 TR	154	} else {
	155	status = acpi_bus_get_device(graphics_handle, &tmp_dev);
	156	if (ACPI_FAILURE(status)) {
	157	ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
	158	return 0;
	159	}
	160	acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
2263576c	161	ACPI_UINT32_MAX, find_video, NULL,
c3d6de69 TR	162	&caps, NULL);
	163	}
	164	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
	165	graphics_handle ? caps : acpi_video_support,
	166	graphics_handle ? "on device " : "in general",
	167	graphics_handle ? acpi_device_bid(tmp_dev) : ""));
	168	return caps;
	169	}
c3d6de69	170
f838eb5b	171	static void acpi_video_caps_check(void)
c3d6de69 TR	172	{
	173	/*
	174	* We must check whether the ACPI graphics device is physically plugged
	175	* in. Therefore this must be called after binding PCI and ACPI devices
	176	*/
	177	if (!acpi_video_caps_checked)
	178	acpi_video_get_capabilities(NULL);
f838eb5b CC	179	}
	180
	181	/* Promote the vendor interface instead of the generic video module.
	182	* This function allow DMI blacklists to be implemented by externals
	183	* platform drivers instead of putting a big blacklist in video_detect.c
	184	* After calling this function you will probably want to call
	185	* acpi_video_unregister() to make sure the video module is not loaded
	186	*/
	187	void acpi_video_dmi_promote_vendor(void)
	188	{
	189	acpi_video_caps_check();
	190	acpi_video_support \|= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
	191	}
	192	EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
	193
f838eb5b CC	194	/* Returns true if video.ko can do backlight switching */
	195	int acpi_video_backlight_support(void)
	196	{
	197	acpi_video_caps_check();
c3d6de69 TR	198
	199	/* First check for boot param -> highest prio */
	200	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
	201	return 0;
	202	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
	203	return 1;
	204
	205	/* Then check for DMI blacklist -> second highest prio */
	206	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
	207	return 0;
	208	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
	209	return 1;
	210
	211	/* Then go the default way */
	212	return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
	213	}
	214	EXPORT_SYMBOL(acpi_video_backlight_support);
	215
	216	/*
677bd810 ZR	217	* Use acpi_backlight=vendor/video to force that backlight switching
677bd810 ZR	218	* is processed by vendor specific acpi drivers or video.ko driver.
c3d6de69	219	*/
8a383ef0	220	static int __init acpi_backlight(char *str)
c3d6de69 TR	221	{
	222	if (str == NULL \|\| *str == '\0')
	223	return 1;
	224	else {
	225	if (!strcmp("vendor", str))
	226	acpi_video_support \|=
	227	ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
	228	if (!strcmp("video", str))
	229	acpi_video_support \|=
eeb4bcb4	230	ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
c3d6de69 TR	231	}
	232	return 1;
	233	}
	234	__setup("acpi_backlight=", acpi_backlight);