/drivers/acpi/video_detect.c

  1/*
  2 *  Copyright (C) 2015       Red Hat Inc.
  3 *                           Hans de Goede <hdegoede@redhat.com>
  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:
 10 * After PCI devices are glued with ACPI devices
 11 * acpi_get_pci_dev() can be called to identify ACPI graphics
 12 * devices for which a real graphics card is plugged in
 13 *
 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 *
 17 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
 18 * sony_acpi,... can take care about backlight brightness.
 19 *
 20 * Backlight drivers can use acpi_video_get_backlight_type() to determine
 21 * which driver should handle the backlight.
 22 *
 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.
 26 */
 27
 28#include <linux/export.h>
 29#include <linux/acpi.h>
 30#include <linux/backlight.h>
 31#include <linux/dmi.h>
 32#include <linux/module.h>
 33#include <linux/pci.h>
 34#include <linux/types.h>
 35#include <linux/workqueue.h>
 36#include <acpi/video.h>
 37
 38ACPI_MODULE_NAME("video");
 39#define _COMPONENT		ACPI_VIDEO_COMPONENT
 40
 41void acpi_video_unregister_backlight(void);
 42
 43static bool backlight_notifier_registered;
 44static struct notifier_block backlight_nb;
 45static struct work_struct backlight_notify_work;
 46
 47static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
 48static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
 49
 50static void acpi_video_parse_cmdline(void)
 51{
 52	if (!strcmp("vendor", acpi_video_backlight_string))
 53		acpi_backlight_cmdline = acpi_backlight_vendor;
 54	if (!strcmp("video", acpi_video_backlight_string))
 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;
 60}
 61
 62static acpi_status
 63find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
 64{
 65	long *cap = context;
 66	struct pci_dev *dev;
 67	struct acpi_device *acpi_dev;
 68
 69	static const struct acpi_device_id video_ids[] = {
 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)) {
 77		dev = acpi_get_pci_dev(handle);
 78		if (!dev)
 79			return AE_OK;
 80		pci_dev_put(dev);
 81		*cap |= acpi_is_video_device(handle);
 82	}
 83	return AE_OK;
 84}
 85
 86/* Force to use vendor driver when the ACPI device is known to be
 87 * buggy */
 88static int video_detect_force_vendor(const struct dmi_system_id *d)
 89{
 90	acpi_backlight_dmi = acpi_backlight_vendor;
 91	return 0;
 92}
 93
 94static int video_detect_force_video(const struct dmi_system_id *d)
 95{
 96	acpi_backlight_dmi = acpi_backlight_video;
 97	return 0;
 98}
 99
100static int video_detect_force_native(const struct dmi_system_id *d)
101{
102	acpi_backlight_dmi = acpi_backlight_native;
103	return 0;
104}
105
106static int video_detect_force_none(const struct dmi_system_id *d)
107{
108	acpi_backlight_dmi = acpi_backlight_none;
109	return 0;
110}
111
112static const struct dmi_system_id video_detect_dmi_table[] = {
113	/* On Samsung X360, the BIOS will set a flag (VDRV) if generic
114	 * ACPI backlight device is used. This flag will definitively break
115	 * the backlight interface (even the vendor interface) until next
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	},
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	},
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	},
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	},
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	},
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        },
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	},
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	},
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	},
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	},
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	},
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	},
285
286	/* Non win8 machines which need native backlight nevertheless */
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	},
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	 .callback = video_detect_force_native,
307	 .ident = "Lenovo E41-25",
308	 .matches = {
309		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
310		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
311		},
312	},
313	{
314	 .callback = video_detect_force_native,
315	 .ident = "Lenovo E41-45",
316	 .matches = {
317		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
318		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
319		},
320	},
321	{
322	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
323	 .callback = video_detect_force_native,
324	 .ident = "Apple MacBook Pro 12,1",
325	 .matches = {
326		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
327		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
328		},
329	},
330	{
331	 .callback = video_detect_force_native,
332	 .ident = "Dell Vostro V131",
333	 .matches = {
334		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
335		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
336		},
337	},
338	{
339	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
340	 .callback = video_detect_force_native,
341	 .ident = "Dell XPS 17 L702X",
342	 .matches = {
343		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
344		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
345		},
346	},
347	{
348	 .callback = video_detect_force_native,
349	 .ident = "Dell Precision 7510",
350	 .matches = {
351		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
352		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
353		},
354	},
355	{
356	 .callback = video_detect_force_native,
357	 .ident = "Acer Aspire 5738z",
358	 .matches = {
359		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
360		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
361		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
362		},
363	},
364
365	/*
366	 * Desktops which falsely report a backlight and which our heuristics
367	 * for this do not catch.
368	 */
369	{
370	 .callback = video_detect_force_none,
371	 .ident = "Dell OptiPlex 9020M",
372	 .matches = {
373		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
374		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
375		},
376	},
377	{
378	 .callback = video_detect_force_none,
379	 .ident = "MSI MS-7721",
380	 .matches = {
381		DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
382		DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
383		},
384	},
385	{ },
386};
387
388/* This uses a workqueue to avoid various locking ordering issues */
389static void acpi_video_backlight_notify_work(struct work_struct *work)
390{
391	if (acpi_video_get_backlight_type() != acpi_backlight_video)
392		acpi_video_unregister_backlight();
393}
394
395static int acpi_video_backlight_notify(struct notifier_block *nb,
396				       unsigned long val, void *bd)
397{
398	struct backlight_device *backlight = bd;
399
400	/* A raw bl registering may change video -> native */
401	if (backlight->props.type == BACKLIGHT_RAW &&
402	    val == BACKLIGHT_REGISTERED)
403		schedule_work(&backlight_notify_work);
404
405	return NOTIFY_OK;
406}
407
408/*
409 * Determine which type of backlight interface to use on this system,
410 * First check cmdline, then dmi quirks, then do autodetect.
411 *
412 * The autodetect order is:
413 * 1) Is the acpi-video backlight interface supported ->
414 *  no, use a vendor interface
415 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
416 *  yes, use a native interface
417 * 3) Else use the acpi-video interface
418 *
419 * Arguably the native on win8 check should be done first, but that would
420 * be a behavior change, which may causes issues.
421 */
422enum acpi_backlight_type acpi_video_get_backlight_type(void)
423{
424	static DEFINE_MUTEX(init_mutex);
425	static bool init_done;
426	static long video_caps;
427
428	/* Parse cmdline, dmi and acpi only once */
429	mutex_lock(&init_mutex);
430	if (!init_done) {
431		acpi_video_parse_cmdline();
432		dmi_check_system(video_detect_dmi_table);
433		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
434				    ACPI_UINT32_MAX, find_video, NULL,
435				    &video_caps, NULL);
436		INIT_WORK(&backlight_notify_work,
437			  acpi_video_backlight_notify_work);
438		backlight_nb.notifier_call = acpi_video_backlight_notify;
439		backlight_nb.priority = 0;
440		if (backlight_register_notifier(&backlight_nb) == 0)
441			backlight_notifier_registered = true;
442		init_done = true;
443	}
444	mutex_unlock(&init_mutex);
445
446	if (acpi_backlight_cmdline != acpi_backlight_undef)
447		return acpi_backlight_cmdline;
448
449	if (acpi_backlight_dmi != acpi_backlight_undef)
450		return acpi_backlight_dmi;
451
452	if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
453		return acpi_backlight_vendor;
454
455	if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
456		return acpi_backlight_native;
457
458	return acpi_backlight_video;
459}
460EXPORT_SYMBOL(acpi_video_get_backlight_type);
461
462/*
463 * Set the preferred backlight interface type based on DMI info.
464 * This function allows DMI blacklists to be implemented by external
465 * platform drivers instead of putting a big blacklist in video_detect.c
466 */
467void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
468{
469	acpi_backlight_dmi = type;
470	/* Remove acpi-video backlight interface if it is no longer desired */
471	if (acpi_video_get_backlight_type() != acpi_backlight_video)
472		acpi_video_unregister_backlight();
473}
474EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
475
476void __exit acpi_video_detect_exit(void)
477{
478	if (backlight_notifier_registered)
479		backlight_unregister_notifier(&backlight_nb);
480}