1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * video.c - ACPI Video Driver
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/input.h>
17 #include <linux/backlight.h>
18 #include <linux/thermal.h>
19 #include <linux/sort.h>
20 #include <linux/pci.h>
21 #include <linux/pci_ids.h>
22 #include <linux/slab.h>
23 #include <linux/dmi.h>
24 #include <linux/suspend.h>
25 #include <linux/acpi.h>
26 #include <acpi/video.h>
27 #include <linux/uaccess.h>
29 #define PREFIX "ACPI: "
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
34 #define MAX_NAME_LEN 20
36 #define _COMPONENT ACPI_VIDEO_COMPONENT
37 ACPI_MODULE_NAME("video");
39 MODULE_AUTHOR("Bruno Ducrot");
40 MODULE_DESCRIPTION("ACPI Video Driver");
41 MODULE_LICENSE("GPL");
43 static bool brightness_switch_enabled = true;
44 module_param(brightness_switch_enabled, bool, 0644);
47 * By default, we don't allow duplicate ACPI video bus devices
48 * under the same VGA controller
50 static bool allow_duplicates;
51 module_param(allow_duplicates, bool, 0644);
53 static int disable_backlight_sysfs_if = -1;
54 module_param(disable_backlight_sysfs_if, int, 0444);
56 #define REPORT_OUTPUT_KEY_EVENTS 0x01
57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
58 static int report_key_events = -1;
59 module_param(report_key_events, int, 0644);
60 MODULE_PARM_DESC(report_key_events,
61 "0: none, 1: output changes, 2: brightness changes, 3: all");
63 static int hw_changes_brightness = -1;
64 module_param(hw_changes_brightness, int, 0644);
65 MODULE_PARM_DESC(hw_changes_brightness,
66 "Set this to 1 on buggy hw which changes the brightness itself when "
67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
70 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
71 * assumed even if not actually set.
73 static bool device_id_scheme = false;
74 module_param(device_id_scheme, bool, 0444);
76 static int only_lcd = -1;
77 module_param(only_lcd, int, 0444);
79 static int register_count;
80 static DEFINE_MUTEX(register_count_mutex);
81 static DEFINE_MUTEX(video_list_lock);
82 static LIST_HEAD(video_bus_head);
83 static int acpi_video_bus_add(struct acpi_device *device);
84 static int acpi_video_bus_remove(struct acpi_device *device);
85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
86 void acpi_video_detect_exit(void);
89 * Indices in the _BCL method response: the first two items are special,
90 * the rest are all supported levels.
92 * See page 575 of the ACPI spec 3.0
94 enum acpi_video_level_idx {
95 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
96 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
97 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
100 static const struct acpi_device_id video_device_ids[] = {
104 MODULE_DEVICE_TABLE(acpi, video_device_ids);
106 static struct acpi_driver acpi_video_bus = {
108 .class = ACPI_VIDEO_CLASS,
109 .ids = video_device_ids,
111 .add = acpi_video_bus_add,
112 .remove = acpi_video_bus_remove,
113 .notify = acpi_video_bus_notify,
117 struct acpi_video_bus_flags {
118 u8 multihead:1; /* can switch video heads */
119 u8 rom:1; /* can retrieve a video rom */
120 u8 post:1; /* can configure the head to */
124 struct acpi_video_bus_cap {
125 u8 _DOS:1; /* Enable/Disable output switching */
126 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
127 u8 _ROM:1; /* Get ROM Data */
128 u8 _GPD:1; /* Get POST Device */
129 u8 _SPD:1; /* Set POST Device */
130 u8 _VPO:1; /* Video POST Options */
134 struct acpi_video_device_attrib {
135 u32 display_index:4; /* A zero-based instance of the Display */
136 u32 display_port_attachment:4; /* This field differentiates the display type */
137 u32 display_type:4; /* Describe the specific type in use */
138 u32 vendor_specific:4; /* Chipset Vendor Specific */
139 u32 bios_can_detect:1; /* BIOS can detect the device */
140 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
142 u32 pipe_id:3; /* For VGA multiple-head devices. */
143 u32 reserved:10; /* Must be 0 */
146 * The device ID might not actually follow the scheme described by this
147 * struct acpi_video_device_attrib. If it does, then this bit
148 * device_id_scheme is set; otherwise, other fields should be ignored.
150 * (but also see the global flag device_id_scheme)
152 u32 device_id_scheme:1;
155 struct acpi_video_enumerated_device {
158 struct acpi_video_device_attrib attrib;
160 struct acpi_video_device *bind_info;
163 struct acpi_video_bus {
164 struct acpi_device *device;
165 bool backlight_registered;
167 struct acpi_video_enumerated_device *attached_array;
170 struct acpi_video_bus_cap cap;
171 struct acpi_video_bus_flags flags;
172 struct list_head video_device_list;
173 struct mutex device_list_lock; /* protects video_device_list */
174 struct list_head entry;
175 struct input_dev *input;
176 char phys[32]; /* for input device */
177 struct notifier_block pm_nb;
180 struct acpi_video_device_flags {
191 struct acpi_video_device_cap {
192 u8 _ADR:1; /* Return the unique ID */
193 u8 _BCL:1; /* Query list of brightness control levels supported */
194 u8 _BCM:1; /* Set the brightness level */
195 u8 _BQC:1; /* Get current brightness level */
196 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
197 u8 _DDC:1; /* Return the EDID for this device */
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct delayed_work switch_brightness_work;
206 int switch_brightness_event;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
214 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
215 static void acpi_video_device_rebind(struct acpi_video_bus *video);
216 static void acpi_video_device_bind(struct acpi_video_bus *video,
217 struct acpi_video_device *device);
218 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
219 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
221 static int acpi_video_device_lcd_get_level_current(
222 struct acpi_video_device *device,
223 unsigned long long *level, bool raw);
224 static int acpi_video_get_next_level(struct acpi_video_device *device,
225 u32 level_current, u32 event);
226 static void acpi_video_switch_brightness(struct work_struct *work);
228 /* backlight device sysfs support */
229 static int acpi_video_get_brightness(struct backlight_device *bd)
231 unsigned long long cur_level;
233 struct acpi_video_device *vd = bl_get_data(bd);
235 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
237 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
238 if (vd->brightness->levels[i] == cur_level)
239 return i - ACPI_VIDEO_FIRST_LEVEL;
244 static int acpi_video_set_brightness(struct backlight_device *bd)
246 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
247 struct acpi_video_device *vd = bl_get_data(bd);
249 cancel_delayed_work(&vd->switch_brightness_work);
250 return acpi_video_device_lcd_set_level(vd,
251 vd->brightness->levels[request_level]);
254 static const struct backlight_ops acpi_backlight_ops = {
255 .get_brightness = acpi_video_get_brightness,
256 .update_status = acpi_video_set_brightness,
259 /* thermal cooling device callbacks */
260 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
261 unsigned long *state)
263 struct acpi_device *device = cooling_dev->devdata;
264 struct acpi_video_device *video = acpi_driver_data(device);
266 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
270 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
271 unsigned long *state)
273 struct acpi_device *device = cooling_dev->devdata;
274 struct acpi_video_device *video = acpi_driver_data(device);
275 unsigned long long level;
278 if (acpi_video_device_lcd_get_level_current(video, &level, false))
280 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
282 if (level == video->brightness->levels[offset]) {
283 *state = video->brightness->count - offset - 1;
291 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
297 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
300 state = video->brightness->count - state;
301 level = video->brightness->levels[state - 1];
302 return acpi_video_device_lcd_set_level(video, level);
305 static const struct thermal_cooling_device_ops video_cooling_ops = {
306 .get_max_state = video_get_max_state,
307 .get_cur_state = video_get_cur_state,
308 .set_cur_state = video_set_cur_state,
312 * --------------------------------------------------------------------------
314 * --------------------------------------------------------------------------
318 acpi_video_device_lcd_query_levels(acpi_handle handle,
319 union acpi_object **levels)
322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 union acpi_object *obj;
328 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
329 if (!ACPI_SUCCESS(status))
331 obj = (union acpi_object *)buffer.pointer;
332 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
333 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
343 kfree(buffer.pointer);
349 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
354 status = acpi_execute_simple_method(device->dev->handle,
356 if (ACPI_FAILURE(status)) {
357 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
361 device->brightness->curr = level;
362 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
364 if (level == device->brightness->levels[state]) {
365 if (device->backlight)
366 device->backlight->props.brightness =
367 state - ACPI_VIDEO_FIRST_LEVEL;
371 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
376 * For some buggy _BQC methods, we need to add a constant value to
377 * the _BQC return value to get the actual current brightness level
380 static int bqc_offset_aml_bug_workaround;
381 static int video_set_bqc_offset(const struct dmi_system_id *d)
383 bqc_offset_aml_bug_workaround = 9;
387 static int video_disable_backlight_sysfs_if(
388 const struct dmi_system_id *d)
390 if (disable_backlight_sysfs_if == -1)
391 disable_backlight_sysfs_if = 1;
395 static int video_set_device_id_scheme(const struct dmi_system_id *d)
397 device_id_scheme = true;
401 static int video_enable_only_lcd(const struct dmi_system_id *d)
407 static int video_set_report_key_events(const struct dmi_system_id *id)
409 if (report_key_events == -1)
410 report_key_events = (uintptr_t)id->driver_data;
414 static int video_hw_changes_brightness(
415 const struct dmi_system_id *d)
417 if (hw_changes_brightness == -1)
418 hw_changes_brightness = 1;
422 static const struct dmi_system_id video_dmi_table[] = {
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5720",
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 5710Z",
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
443 .callback = video_set_bqc_offset,
444 .ident = "eMachines E510",
446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 5315",
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
459 .callback = video_set_bqc_offset,
460 .ident = "Acer Aspire 7720",
462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback = video_disable_backlight_sysfs_if,
477 .ident = "Toshiba Portege R700",
479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback = video_disable_backlight_sysfs_if,
486 .ident = "Toshiba Portege R830",
488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback = video_disable_backlight_sysfs_if,
495 .ident = "Toshiba Satellite R830",
497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
502 .callback = video_disable_backlight_sysfs_if,
503 .ident = "Toshiba Satellite Z830",
505 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
506 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"),
510 .callback = video_disable_backlight_sysfs_if,
511 .ident = "Toshiba Portege Z830",
513 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
514 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"),
518 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
519 * but the IDs actually follow the Device ID Scheme.
522 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
523 .callback = video_set_device_id_scheme,
524 .ident = "ESPRIMO Mobile M9410",
526 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
531 * Some machines have multiple video output devices, but only the one
532 * that is the type of LCD can do the backlight control so we should not
533 * register backlight interface for other video output devices.
536 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
537 .callback = video_enable_only_lcd,
538 .ident = "ESPRIMO Mobile M9410",
540 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
541 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
545 * Some machines report wrong key events on the acpi-bus, suppress
546 * key event reporting on these. Note this is only intended to work
547 * around events which are plain wrong. In some cases we get double
548 * events, in this case acpi-video is considered the canonical source
549 * and the events from the other source should be filtered. E.g.
550 * by calling acpi_video_handles_brightness_key_presses() from the
551 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
554 .callback = video_set_report_key_events,
555 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
556 .ident = "Dell Vostro V131",
558 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
559 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
563 .callback = video_set_report_key_events,
564 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
565 .ident = "Dell Vostro 3350",
567 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
568 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
572 .callback = video_set_report_key_events,
573 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
574 .ident = "COLORFUL X15 AT 23",
576 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"),
577 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"),
581 * Some machines change the brightness themselves when a brightness
582 * hotkey gets pressed, despite us telling them not to. In this case
583 * acpi_video_device_notify() should only call backlight_force_update(
584 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
587 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
588 .callback = video_hw_changes_brightness,
589 .ident = "Packard Bell EasyNote MZ35",
591 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
592 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
598 static unsigned long long
599 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
600 unsigned long long bqc_value)
602 unsigned long long level;
604 if (device->brightness->flags._BQC_use_index) {
606 * _BQC returns an index that doesn't account for the first 2
607 * items with special meaning (see enum acpi_video_level_idx),
608 * so we need to compensate for that by offsetting ourselves
610 if (device->brightness->flags._BCL_reversed)
611 bqc_value = device->brightness->count -
612 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
614 level = device->brightness->levels[bqc_value +
615 ACPI_VIDEO_FIRST_LEVEL];
620 level += bqc_offset_aml_bug_workaround;
626 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
627 unsigned long long *level, bool raw)
629 acpi_status status = AE_OK;
632 if (device->cap._BQC || device->cap._BCQ) {
633 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
635 status = acpi_evaluate_integer(device->dev->handle, buf,
637 if (ACPI_SUCCESS(status)) {
640 * Caller has indicated he wants the raw
641 * value returned by _BQC, so don't furtherly
642 * mess with the value.
647 *level = acpi_video_bqc_value_to_level(device, *level);
649 for (i = ACPI_VIDEO_FIRST_LEVEL;
650 i < device->brightness->count; i++)
651 if (device->brightness->levels[i] == *level) {
652 device->brightness->curr = *level;
656 * BQC returned an invalid level.
659 ACPI_WARNING((AE_INFO,
660 "%s returned an invalid level",
662 device->cap._BQC = device->cap._BCQ = 0;
666 * should we return an error or ignore this failure?
667 * dev->brightness->curr is a cached value which stores
668 * the correct current backlight level in most cases.
669 * ACPI video backlight still works w/ buggy _BQC.
670 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
672 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
673 device->cap._BQC = device->cap._BCQ = 0;
677 *level = device->brightness->curr;
682 acpi_video_device_EDID(struct acpi_video_device *device,
683 union acpi_object **edid, ssize_t length)
686 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
687 union acpi_object *obj;
688 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
689 struct acpi_object_list args = { 1, &arg0 };
697 arg0.integer.value = 1;
698 else if (length == 256)
699 arg0.integer.value = 2;
703 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
704 if (ACPI_FAILURE(status))
707 obj = buffer.pointer;
709 if (obj && obj->type == ACPI_TYPE_BUFFER)
712 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
724 * video : video bus device pointer
726 * 0. The system BIOS should NOT automatically switch(toggle)
727 * the active display output.
728 * 1. The system BIOS should automatically switch (toggle) the
729 * active display output. No switch event.
730 * 2. The _DGS value should be locked.
731 * 3. The system BIOS should not automatically switch (toggle) the
732 * active display output, but instead generate the display switch
735 * 0. The system BIOS should automatically control the brightness level
737 * - the power changes from AC to DC (ACPI appendix B)
738 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
739 * 1. The system BIOS should NOT automatically control the brightness
740 * level of the LCD when:
741 * - the power changes from AC to DC (ACPI appendix B)
742 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
748 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
752 if (!video->cap._DOS)
755 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
757 video->dos_setting = (lcd_flag << 2) | bios_flag;
758 status = acpi_execute_simple_method(video->device->handle, "_DOS",
759 (lcd_flag << 2) | bios_flag);
760 if (ACPI_FAILURE(status))
767 * Simple comparison function used to sort backlight levels.
771 acpi_video_cmp_level(const void *a, const void *b)
773 return *(int *)a - *(int *)b;
777 * Decides if _BQC/_BCQ for this system is usable
779 * We do this by changing the level first and then read out the current
780 * brightness level, if the value does not match, find out if it is using
781 * index. If not, clear the _BQC/_BCQ capability.
783 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
784 int max_level, int current_level)
786 struct acpi_video_device_brightness *br = device->brightness;
788 unsigned long long level;
791 /* don't mess with existing known broken systems */
792 if (bqc_offset_aml_bug_workaround)
796 * Some systems always report current brightness level as maximum
797 * through _BQC, we need to test another value for them. However,
798 * there is a subtlety:
800 * If the _BCL package ordering is descending, the first level
801 * (br->levels[2]) is likely to be 0, and if the number of levels
802 * matches the number of steps, we might confuse a returned level to
807 * current_level = max_level = 100
809 * returned level = 100
811 * In this case 100 means the level, not the index, and _BCM failed.
812 * Still, if the _BCL package ordering is descending, the index of
813 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
815 * This causes all _BQC calls to return bogus values causing weird
816 * behavior from the user's perspective. For example:
818 * xbacklight -set 10; xbacklight -set 20;
820 * would flash to 90% and then slowly down to the desired level (20).
822 * The solution is simple; test anything other than the first level
825 test_level = current_level == max_level
826 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
829 result = acpi_video_device_lcd_set_level(device, test_level);
833 result = acpi_video_device_lcd_get_level_current(device, &level, true);
837 if (level != test_level) {
838 /* buggy _BQC found, need to find out if it uses index */
839 if (level < br->count) {
840 if (br->flags._BCL_reversed)
841 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
842 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
843 br->flags._BQC_use_index = 1;
846 if (!br->flags._BQC_use_index)
847 device->cap._BQC = device->cap._BCQ = 0;
853 int acpi_video_get_levels(struct acpi_device *device,
854 struct acpi_video_device_brightness **dev_br,
857 union acpi_object *obj = NULL;
858 int i, max_level = 0, count = 0, level_ac_battery = 0;
859 union acpi_object *o;
860 struct acpi_video_device_brightness *br = NULL;
864 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
866 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
867 "LCD brightness level\n"));
872 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
877 br = kzalloc(sizeof(*br), GFP_KERNEL);
879 printk(KERN_ERR "can't allocate memory\n");
885 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
886 * in order to account for buggy BIOS which don't export the first two
887 * special levels (see below)
889 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
897 for (i = 0; i < obj->package.count; i++) {
898 o = (union acpi_object *)&obj->package.elements[i];
899 if (o->type != ACPI_TYPE_INTEGER) {
900 printk(KERN_ERR PREFIX "Invalid data\n");
903 value = (u32) o->integer.value;
904 /* Skip duplicate entries */
905 if (count > ACPI_VIDEO_FIRST_LEVEL
906 && br->levels[count - 1] == value)
909 br->levels[count] = value;
911 if (br->levels[count] > max_level)
912 max_level = br->levels[count];
917 * some buggy BIOS don't export the levels
918 * when machine is on AC/Battery in _BCL package.
919 * In this case, the first two elements in _BCL packages
920 * are also supported brightness levels that OS should take care of.
922 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
923 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
925 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
929 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
930 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
931 br->flags._BCL_no_ac_battery_levels = 1;
932 for (i = (count - 1 + level_ac_battery);
933 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
934 br->levels[i] = br->levels[i - level_ac_battery];
935 count += level_ac_battery;
936 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
937 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
939 /* Check if the _BCL package is in a reversed order */
940 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
941 br->flags._BCL_reversed = 1;
942 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
943 count - ACPI_VIDEO_FIRST_LEVEL,
944 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
945 acpi_video_cmp_level, NULL);
946 } else if (max_level != br->levels[count - 1])
948 "Found unordered _BCL package"));
953 *pmax_level = max_level;
962 EXPORT_SYMBOL(acpi_video_get_levels);
966 * device : video output device (LCD, CRT, ..)
969 * Maximum brightness level
971 * Allocate and initialize device->brightness.
975 acpi_video_init_brightness(struct acpi_video_device *device)
977 int i, max_level = 0;
978 unsigned long long level, level_old;
979 struct acpi_video_device_brightness *br = NULL;
982 result = acpi_video_get_levels(device->dev, &br, &max_level);
985 device->brightness = br;
987 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
988 br->curr = level = max_level;
990 if (!device->cap._BQC)
993 result = acpi_video_device_lcd_get_level_current(device,
996 goto out_free_levels;
998 result = acpi_video_bqc_quirk(device, max_level, level_old);
1000 goto out_free_levels;
1002 * cap._BQC may get cleared due to _BQC is found to be broken
1003 * in acpi_video_bqc_quirk, so check again here.
1005 if (!device->cap._BQC)
1008 level = acpi_video_bqc_value_to_level(device, level_old);
1010 * On some buggy laptops, _BQC returns an uninitialized
1011 * value when invoked for the first time, i.e.
1012 * level_old is invalid (no matter whether it's a level
1013 * or an index). Set the backlight to max_level in this case.
1015 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
1016 if (level == br->levels[i])
1018 if (i == br->count || !level)
1022 result = acpi_video_device_lcd_set_level(device, level);
1024 goto out_free_levels;
1026 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1027 "found %d brightness levels\n",
1028 br->count - ACPI_VIDEO_FIRST_LEVEL));
1034 device->brightness = NULL;
1040 * device : video output device (LCD, CRT, ..)
1045 * Find out all required AML methods defined under the output
1049 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1051 if (acpi_has_method(device->dev->handle, "_ADR"))
1052 device->cap._ADR = 1;
1053 if (acpi_has_method(device->dev->handle, "_BCL"))
1054 device->cap._BCL = 1;
1055 if (acpi_has_method(device->dev->handle, "_BCM"))
1056 device->cap._BCM = 1;
1057 if (acpi_has_method(device->dev->handle, "_BQC")) {
1058 device->cap._BQC = 1;
1059 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1060 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1061 device->cap._BCQ = 1;
1064 if (acpi_has_method(device->dev->handle, "_DDC"))
1065 device->cap._DDC = 1;
1070 * device : video output device (VGA)
1075 * Find out all required AML methods defined under the video bus device.
1078 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1080 if (acpi_has_method(video->device->handle, "_DOS"))
1081 video->cap._DOS = 1;
1082 if (acpi_has_method(video->device->handle, "_DOD"))
1083 video->cap._DOD = 1;
1084 if (acpi_has_method(video->device->handle, "_ROM"))
1085 video->cap._ROM = 1;
1086 if (acpi_has_method(video->device->handle, "_GPD"))
1087 video->cap._GPD = 1;
1088 if (acpi_has_method(video->device->handle, "_SPD"))
1089 video->cap._SPD = 1;
1090 if (acpi_has_method(video->device->handle, "_VPO"))
1091 video->cap._VPO = 1;
1095 * Check whether the video bus device has required AML method to
1096 * support the desired features
1099 static int acpi_video_bus_check(struct acpi_video_bus *video)
1101 acpi_status status = -ENOENT;
1102 struct pci_dev *dev;
1107 dev = acpi_get_pci_dev(video->device->handle);
1113 * Since there is no HID, CID and so on for VGA driver, we have
1114 * to check well known required nodes.
1117 /* Does this device support video switching? */
1118 if (video->cap._DOS || video->cap._DOD) {
1119 if (!video->cap._DOS) {
1120 printk(KERN_WARNING FW_BUG
1121 "ACPI(%s) defines _DOD but not _DOS\n",
1122 acpi_device_bid(video->device));
1124 video->flags.multihead = 1;
1128 /* Does this device support retrieving a video ROM? */
1129 if (video->cap._ROM) {
1130 video->flags.rom = 1;
1134 /* Does this device support configuring which video device to POST? */
1135 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1136 video->flags.post = 1;
1144 * --------------------------------------------------------------------------
1146 * --------------------------------------------------------------------------
1149 /* device interface */
1150 static struct acpi_video_device_attrib *
1151 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1153 struct acpi_video_enumerated_device *ids;
1156 for (i = 0; i < video->attached_count; i++) {
1157 ids = &video->attached_array[i];
1158 if ((ids->value.int_val & 0xffff) == device_id)
1159 return &ids->value.attrib;
1166 acpi_video_get_device_type(struct acpi_video_bus *video,
1167 unsigned long device_id)
1169 struct acpi_video_enumerated_device *ids;
1172 for (i = 0; i < video->attached_count; i++) {
1173 ids = &video->attached_array[i];
1174 if ((ids->value.int_val & 0xffff) == device_id)
1175 return ids->value.int_val;
1182 acpi_video_bus_get_one_device(struct acpi_device *device,
1183 struct acpi_video_bus *video)
1185 unsigned long long device_id;
1186 int status, device_type;
1187 struct acpi_video_device *data;
1188 struct acpi_video_device_attrib *attribute;
1191 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1192 /* Some device omits _ADR, we skip them instead of fail */
1193 if (ACPI_FAILURE(status))
1196 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1200 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1201 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1202 device->driver_data = data;
1204 data->device_id = device_id;
1205 data->video = video;
1207 INIT_DELAYED_WORK(&data->switch_brightness_work,
1208 acpi_video_switch_brightness);
1210 attribute = acpi_video_get_device_attr(video, device_id);
1212 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1213 switch (attribute->display_type) {
1214 case ACPI_VIDEO_DISPLAY_CRT:
1215 data->flags.crt = 1;
1217 case ACPI_VIDEO_DISPLAY_TV:
1218 data->flags.tvout = 1;
1220 case ACPI_VIDEO_DISPLAY_DVI:
1221 data->flags.dvi = 1;
1223 case ACPI_VIDEO_DISPLAY_LCD:
1224 data->flags.lcd = 1;
1227 data->flags.unknown = 1;
1230 if (attribute->bios_can_detect)
1231 data->flags.bios = 1;
1233 /* Check for legacy IDs */
1234 device_type = acpi_video_get_device_type(video, device_id);
1235 /* Ignore bits 16 and 18-20 */
1236 switch (device_type & 0xffe2ffff) {
1237 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1238 data->flags.crt = 1;
1240 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1241 data->flags.lcd = 1;
1243 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1244 data->flags.tvout = 1;
1247 data->flags.unknown = 1;
1251 acpi_video_device_bind(video, data);
1252 acpi_video_device_find_cap(data);
1254 mutex_lock(&video->device_list_lock);
1255 list_add_tail(&data->entry, &video->video_device_list);
1256 mutex_unlock(&video->device_list_lock);
1263 * video : video bus device
1268 * Enumerate the video device list of the video bus,
1269 * bind the ids with the corresponding video devices
1270 * under the video bus.
1273 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1275 struct acpi_video_device *dev;
1277 mutex_lock(&video->device_list_lock);
1279 list_for_each_entry(dev, &video->video_device_list, entry)
1280 acpi_video_device_bind(video, dev);
1282 mutex_unlock(&video->device_list_lock);
1287 * video : video bus device
1288 * device : video output device under the video
1294 * Bind the ids with the corresponding video devices
1295 * under the video bus.
1299 acpi_video_device_bind(struct acpi_video_bus *video,
1300 struct acpi_video_device *device)
1302 struct acpi_video_enumerated_device *ids;
1305 for (i = 0; i < video->attached_count; i++) {
1306 ids = &video->attached_array[i];
1307 if (device->device_id == (ids->value.int_val & 0xffff)) {
1308 ids->bind_info = device;
1309 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1314 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1316 struct acpi_video_bus *video = device->video;
1320 * If we have a broken _DOD or we have more than 8 output devices
1321 * under the graphics controller node that we can't proper deal with
1322 * in the operation region code currently, no need to test.
1324 if (!video->attached_count || video->child_count > 8)
1327 for (i = 0; i < video->attached_count; i++) {
1328 if ((video->attached_array[i].value.int_val & 0xfff) ==
1329 (device->device_id & 0xfff))
1338 * video : video bus device
1343 * Call _DOD to enumerate all devices attached to display adapter
1347 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1352 struct acpi_video_enumerated_device *active_list;
1353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1354 union acpi_object *dod = NULL;
1355 union acpi_object *obj;
1357 if (!video->cap._DOD)
1358 return AE_NOT_EXIST;
1360 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1361 if (!ACPI_SUCCESS(status)) {
1362 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1366 dod = buffer.pointer;
1367 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1368 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1374 dod->package.count));
1376 active_list = kcalloc(1 + dod->package.count,
1377 sizeof(struct acpi_video_enumerated_device),
1385 for (i = 0; i < dod->package.count; i++) {
1386 obj = &dod->package.elements[i];
1388 if (obj->type != ACPI_TYPE_INTEGER) {
1389 printk(KERN_ERR PREFIX
1390 "Invalid _DOD data in element %d\n", i);
1394 active_list[count].value.int_val = obj->integer.value;
1395 active_list[count].bind_info = NULL;
1396 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1397 (int)obj->integer.value));
1401 kfree(video->attached_array);
1403 video->attached_array = active_list;
1404 video->attached_count = count;
1407 kfree(buffer.pointer);
1412 acpi_video_get_next_level(struct acpi_video_device *device,
1413 u32 level_current, u32 event)
1415 int min, max, min_above, max_below, i, l, delta = 255;
1416 max = max_below = 0;
1417 min = min_above = 255;
1418 /* Find closest level to level_current */
1419 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1420 l = device->brightness->levels[i];
1421 if (abs(l - level_current) < abs(delta)) {
1422 delta = l - level_current;
1427 /* Ajust level_current to closest available level */
1428 level_current += delta;
1429 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1430 l = device->brightness->levels[i];
1435 if (l < min_above && l > level_current)
1437 if (l > max_below && l < level_current)
1442 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1443 return (level_current < max) ? min_above : min;
1444 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1445 return (level_current < max) ? min_above : max;
1446 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1447 return (level_current > min) ? max_below : min;
1448 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1449 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1452 return level_current;
1457 acpi_video_switch_brightness(struct work_struct *work)
1459 struct acpi_video_device *device = container_of(to_delayed_work(work),
1460 struct acpi_video_device, switch_brightness_work);
1461 unsigned long long level_current, level_next;
1462 int event = device->switch_brightness_event;
1463 int result = -EINVAL;
1465 /* no warning message if acpi_backlight=vendor or a quirk is used */
1466 if (!device->backlight)
1469 if (!device->brightness)
1472 result = acpi_video_device_lcd_get_level_current(device,
1478 level_next = acpi_video_get_next_level(device, level_current, event);
1480 result = acpi_video_device_lcd_set_level(device, level_next);
1483 backlight_force_update(device->backlight,
1484 BACKLIGHT_UPDATE_HOTKEY);
1488 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1491 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1494 struct acpi_video_bus *video;
1495 struct acpi_video_device *video_device;
1496 union acpi_object *buffer = NULL;
1500 if (!device || !acpi_driver_data(device))
1503 video = acpi_driver_data(device);
1505 for (i = 0; i < video->attached_count; i++) {
1506 video_device = video->attached_array[i].bind_info;
1512 if (!video_device->cap._DDC)
1517 case ACPI_VIDEO_DISPLAY_CRT:
1518 if (!video_device->flags.crt)
1521 case ACPI_VIDEO_DISPLAY_TV:
1522 if (!video_device->flags.tvout)
1525 case ACPI_VIDEO_DISPLAY_DVI:
1526 if (!video_device->flags.dvi)
1529 case ACPI_VIDEO_DISPLAY_LCD:
1530 if (!video_device->flags.lcd)
1534 } else if (video_device->device_id != device_id) {
1538 status = acpi_video_device_EDID(video_device, &buffer, length);
1540 if (ACPI_FAILURE(status) || !buffer ||
1541 buffer->type != ACPI_TYPE_BUFFER) {
1543 status = acpi_video_device_EDID(video_device, &buffer,
1545 if (ACPI_FAILURE(status) || !buffer ||
1546 buffer->type != ACPI_TYPE_BUFFER) {
1551 *edid = buffer->buffer.pointer;
1557 EXPORT_SYMBOL(acpi_video_get_edid);
1560 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1561 struct acpi_device *device)
1564 struct acpi_device *dev;
1567 * There are systems where video module known to work fine regardless
1568 * of broken _DOD and ignoring returned value here doesn't cause
1571 acpi_video_device_enumerate(video);
1573 list_for_each_entry(dev, &device->children, node) {
1575 status = acpi_video_bus_get_one_device(dev, video);
1577 dev_err(&dev->dev, "Can't attach device\n");
1580 video->child_count++;
1585 /* acpi_video interface */
1588 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1589 * preform any automatic brightness change on receiving a notification.
1591 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1593 return acpi_video_bus_DOS(video, 0,
1594 acpi_osi_is_win8() ? 1 : 0);
1597 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1599 return acpi_video_bus_DOS(video, 0,
1600 acpi_osi_is_win8() ? 0 : 1);
1603 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1605 struct acpi_video_bus *video = acpi_driver_data(device);
1606 struct input_dev *input;
1609 if (!video || !video->input)
1612 input = video->input;
1615 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1616 * most likely via hotkey. */
1617 keycode = KEY_SWITCHVIDEOMODE;
1620 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1622 acpi_video_device_enumerate(video);
1623 acpi_video_device_rebind(video);
1624 keycode = KEY_SWITCHVIDEOMODE;
1627 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1628 keycode = KEY_SWITCHVIDEOMODE;
1630 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1631 keycode = KEY_VIDEO_NEXT;
1633 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1634 keycode = KEY_VIDEO_PREV;
1638 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1639 "Unsupported event [0x%x]\n", event));
1643 if (acpi_notifier_call_chain(device, event, 0))
1644 /* Something vetoed the keypress. */
1647 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1648 input_report_key(input, keycode, 1);
1650 input_report_key(input, keycode, 0);
1657 static void brightness_switch_event(struct acpi_video_device *video_device,
1660 if (!brightness_switch_enabled)
1663 video_device->switch_brightness_event = event;
1664 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1667 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1669 struct acpi_video_device *video_device = data;
1670 struct acpi_device *device = NULL;
1671 struct acpi_video_bus *bus;
1672 struct input_dev *input;
1678 device = video_device->dev;
1679 bus = video_device->video;
1682 if (hw_changes_brightness > 0) {
1683 if (video_device->backlight)
1684 backlight_force_update(video_device->backlight,
1685 BACKLIGHT_UPDATE_HOTKEY);
1686 acpi_notifier_call_chain(device, event, 0);
1691 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1692 brightness_switch_event(video_device, event);
1693 keycode = KEY_BRIGHTNESS_CYCLE;
1695 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1696 brightness_switch_event(video_device, event);
1697 keycode = KEY_BRIGHTNESSUP;
1699 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1700 brightness_switch_event(video_device, event);
1701 keycode = KEY_BRIGHTNESSDOWN;
1703 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1704 brightness_switch_event(video_device, event);
1705 keycode = KEY_BRIGHTNESS_ZERO;
1707 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1708 brightness_switch_event(video_device, event);
1709 keycode = KEY_DISPLAY_OFF;
1712 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1713 "Unsupported event [0x%x]\n", event));
1717 acpi_notifier_call_chain(device, event, 0);
1719 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1720 input_report_key(input, keycode, 1);
1722 input_report_key(input, keycode, 0);
1729 static int acpi_video_resume(struct notifier_block *nb,
1730 unsigned long val, void *ign)
1732 struct acpi_video_bus *video;
1733 struct acpi_video_device *video_device;
1737 case PM_HIBERNATION_PREPARE:
1738 case PM_SUSPEND_PREPARE:
1739 case PM_RESTORE_PREPARE:
1743 video = container_of(nb, struct acpi_video_bus, pm_nb);
1745 dev_info(&video->device->dev, "Restoring backlight state\n");
1747 for (i = 0; i < video->attached_count; i++) {
1748 video_device = video->attached_array[i].bind_info;
1749 if (video_device && video_device->brightness)
1750 acpi_video_device_lcd_set_level(video_device,
1751 video_device->brightness->curr);
1758 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1759 void **return_value)
1761 struct acpi_device *device = context;
1762 struct acpi_device *sibling;
1765 if (handle == device->handle)
1766 return AE_CTRL_TERMINATE;
1768 result = acpi_bus_get_device(handle, &sibling);
1772 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1773 return AE_ALREADY_EXISTS;
1778 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1780 struct backlight_properties props;
1781 struct pci_dev *pdev;
1782 acpi_handle acpi_parent;
1783 struct device *parent = NULL;
1788 result = acpi_video_init_brightness(device);
1792 if (disable_backlight_sysfs_if > 0)
1795 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1800 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) {
1801 pdev = acpi_get_pci_dev(acpi_parent);
1803 parent = &pdev->dev;
1808 memset(&props, 0, sizeof(struct backlight_properties));
1809 props.type = BACKLIGHT_FIRMWARE;
1810 props.max_brightness =
1811 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1812 device->backlight = backlight_device_register(name,
1815 &acpi_backlight_ops,
1818 if (IS_ERR(device->backlight)) {
1819 device->backlight = NULL;
1824 * Save current brightness level in case we have to restore it
1825 * before acpi_video_device_lcd_set_level() is called next time.
1827 device->backlight->props.brightness =
1828 acpi_video_get_brightness(device->backlight);
1830 device->cooling_dev = thermal_cooling_device_register("LCD",
1831 device->dev, &video_cooling_ops);
1832 if (IS_ERR(device->cooling_dev)) {
1834 * Set cooling_dev to NULL so we don't crash trying to free it.
1835 * Also, why the hell we are returning early and not attempt to
1836 * register video output if cooling device registration failed?
1839 device->cooling_dev = NULL;
1843 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1844 device->cooling_dev->id);
1845 result = sysfs_create_link(&device->dev->dev.kobj,
1846 &device->cooling_dev->device.kobj,
1849 printk(KERN_ERR PREFIX "Create sysfs link\n");
1850 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1851 &device->dev->dev.kobj, "device");
1853 printk(KERN_ERR PREFIX "Create sysfs link\n");
1856 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1858 struct acpi_video_device *dev;
1859 union acpi_object *levels;
1861 mutex_lock(&video->device_list_lock);
1862 list_for_each_entry(dev, &video->video_device_list, entry) {
1863 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1866 mutex_unlock(&video->device_list_lock);
1869 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1872 * Do not create backlight device for video output
1873 * device that is not in the enumerated list.
1875 if (!acpi_video_device_in_dod(dev)) {
1876 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1881 return dev->flags.lcd;
1885 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1887 struct acpi_video_device *dev;
1889 if (video->backlight_registered)
1892 acpi_video_run_bcl_for_osi(video);
1894 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1897 mutex_lock(&video->device_list_lock);
1898 list_for_each_entry(dev, &video->video_device_list, entry) {
1899 if (acpi_video_should_register_backlight(dev))
1900 acpi_video_dev_register_backlight(dev);
1902 mutex_unlock(&video->device_list_lock);
1904 video->backlight_registered = true;
1906 video->pm_nb.notifier_call = acpi_video_resume;
1907 video->pm_nb.priority = 0;
1908 return register_pm_notifier(&video->pm_nb);
1911 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1913 if (device->backlight) {
1914 backlight_device_unregister(device->backlight);
1915 device->backlight = NULL;
1917 if (device->brightness) {
1918 kfree(device->brightness->levels);
1919 kfree(device->brightness);
1920 device->brightness = NULL;
1922 if (device->cooling_dev) {
1923 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1924 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1925 thermal_cooling_device_unregister(device->cooling_dev);
1926 device->cooling_dev = NULL;
1930 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1932 struct acpi_video_device *dev;
1935 if (!video->backlight_registered)
1938 error = unregister_pm_notifier(&video->pm_nb);
1940 mutex_lock(&video->device_list_lock);
1941 list_for_each_entry(dev, &video->video_device_list, entry)
1942 acpi_video_dev_unregister_backlight(dev);
1943 mutex_unlock(&video->device_list_lock);
1945 video->backlight_registered = false;
1950 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1953 struct acpi_device *adev = device->dev;
1955 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1956 acpi_video_device_notify, device);
1957 if (ACPI_FAILURE(status))
1958 dev_err(&adev->dev, "Error installing notify handler\n");
1960 device->flags.notify = 1;
1963 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1965 struct input_dev *input;
1966 struct acpi_video_device *dev;
1969 video->input = input = input_allocate_device();
1975 error = acpi_video_bus_start_devices(video);
1977 goto err_free_input;
1979 snprintf(video->phys, sizeof(video->phys),
1980 "%s/video/input0", acpi_device_hid(video->device));
1982 input->name = acpi_device_name(video->device);
1983 input->phys = video->phys;
1984 input->id.bustype = BUS_HOST;
1985 input->id.product = 0x06;
1986 input->dev.parent = &video->device->dev;
1987 input->evbit[0] = BIT(EV_KEY);
1988 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1989 set_bit(KEY_VIDEO_NEXT, input->keybit);
1990 set_bit(KEY_VIDEO_PREV, input->keybit);
1991 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1992 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1993 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1994 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1995 set_bit(KEY_DISPLAY_OFF, input->keybit);
1997 error = input_register_device(input);
2001 mutex_lock(&video->device_list_lock);
2002 list_for_each_entry(dev, &video->video_device_list, entry)
2003 acpi_video_dev_add_notify_handler(dev);
2004 mutex_unlock(&video->device_list_lock);
2009 acpi_video_bus_stop_devices(video);
2011 input_free_device(input);
2012 video->input = NULL;
2017 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2019 if (dev->flags.notify) {
2020 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2021 acpi_video_device_notify);
2022 dev->flags.notify = 0;
2026 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2028 struct acpi_video_device *dev;
2030 mutex_lock(&video->device_list_lock);
2031 list_for_each_entry(dev, &video->video_device_list, entry)
2032 acpi_video_dev_remove_notify_handler(dev);
2033 mutex_unlock(&video->device_list_lock);
2035 acpi_video_bus_stop_devices(video);
2036 input_unregister_device(video->input);
2037 video->input = NULL;
2040 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2042 struct acpi_video_device *dev, *next;
2044 mutex_lock(&video->device_list_lock);
2045 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2046 list_del(&dev->entry);
2049 mutex_unlock(&video->device_list_lock);
2054 static int instance;
2056 static int acpi_video_bus_add(struct acpi_device *device)
2058 struct acpi_video_bus *video;
2062 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2063 device->parent->handle, 1,
2064 acpi_video_bus_match, NULL,
2066 if (status == AE_ALREADY_EXISTS) {
2067 printk(KERN_WARNING FW_BUG
2068 "Duplicate ACPI video bus devices for the"
2069 " same VGA controller, please try module "
2070 "parameter \"video.allow_duplicates=1\""
2071 "if the current driver doesn't work.\n");
2072 if (!allow_duplicates)
2076 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2080 /* a hack to fix the duplicate name "VID" problem on T61 */
2081 if (!strcmp(device->pnp.bus_id, "VID")) {
2083 device->pnp.bus_id[3] = '0' + instance;
2086 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2087 if (!strcmp(device->pnp.bus_id, "VGA")) {
2089 device->pnp.bus_id[3] = '0' + instance;
2093 video->device = device;
2094 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2095 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2096 device->driver_data = video;
2098 acpi_video_bus_find_cap(video);
2099 error = acpi_video_bus_check(video);
2101 goto err_free_video;
2103 mutex_init(&video->device_list_lock);
2104 INIT_LIST_HEAD(&video->video_device_list);
2106 error = acpi_video_bus_get_devices(video, device);
2110 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2111 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2112 video->flags.multihead ? "yes" : "no",
2113 video->flags.rom ? "yes" : "no",
2114 video->flags.post ? "yes" : "no");
2115 mutex_lock(&video_list_lock);
2116 list_add_tail(&video->entry, &video_bus_head);
2117 mutex_unlock(&video_list_lock);
2119 acpi_video_bus_register_backlight(video);
2120 acpi_video_bus_add_notify_handler(video);
2125 acpi_video_bus_put_devices(video);
2126 kfree(video->attached_array);
2129 device->driver_data = NULL;
2134 static int acpi_video_bus_remove(struct acpi_device *device)
2136 struct acpi_video_bus *video = NULL;
2139 if (!device || !acpi_driver_data(device))
2142 video = acpi_driver_data(device);
2144 acpi_video_bus_remove_notify_handler(video);
2145 acpi_video_bus_unregister_backlight(video);
2146 acpi_video_bus_put_devices(video);
2148 mutex_lock(&video_list_lock);
2149 list_del(&video->entry);
2150 mutex_unlock(&video_list_lock);
2152 kfree(video->attached_array);
2158 static int __init is_i740(struct pci_dev *dev)
2160 if (dev->device == 0x00D1)
2162 if (dev->device == 0x7000)
2167 static int __init intel_opregion_present(void)
2170 struct pci_dev *dev = NULL;
2173 for_each_pci_dev(dev) {
2174 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2176 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2178 /* We don't want to poke around undefined i740 registers */
2181 pci_read_config_dword(dev, 0xfc, &address);
2189 /* Check if the chassis-type indicates there is no builtin LCD panel */
2190 static bool dmi_is_desktop(void)
2192 const char *chassis_type;
2195 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2199 if (kstrtoul(chassis_type, 10, &type) != 0)
2203 case 0x03: /* Desktop */
2204 case 0x04: /* Low Profile Desktop */
2205 case 0x05: /* Pizza Box */
2206 case 0x06: /* Mini Tower */
2207 case 0x07: /* Tower */
2208 case 0x10: /* Lunch Box */
2209 case 0x11: /* Main Server Chassis */
2216 int acpi_video_register(void)
2220 mutex_lock(®ister_count_mutex);
2221 if (register_count) {
2223 * if the function of acpi_video_register is already called,
2224 * don't register the acpi_video_bus again and return no error.
2230 * We're seeing a lot of bogus backlight interfaces on newer machines
2231 * without a LCD such as desktops, servers and HDMI sticks. Checking
2232 * the lcd flag fixes this, so enable this on any machines which are
2233 * win8 ready (where we also prefer the native backlight driver, so
2234 * normally the acpi_video code should not register there anyways).
2236 if (only_lcd == -1) {
2237 if (dmi_is_desktop() && acpi_osi_is_win8())
2243 dmi_check_system(video_dmi_table);
2245 ret = acpi_bus_register_driver(&acpi_video_bus);
2250 * When the acpi_video_bus is loaded successfully, increase
2251 * the counter reference.
2256 mutex_unlock(®ister_count_mutex);
2259 EXPORT_SYMBOL(acpi_video_register);
2261 void acpi_video_unregister(void)
2263 mutex_lock(®ister_count_mutex);
2264 if (register_count) {
2265 acpi_bus_unregister_driver(&acpi_video_bus);
2268 mutex_unlock(®ister_count_mutex);
2270 EXPORT_SYMBOL(acpi_video_unregister);
2272 void acpi_video_unregister_backlight(void)
2274 struct acpi_video_bus *video;
2276 mutex_lock(®ister_count_mutex);
2277 if (register_count) {
2278 mutex_lock(&video_list_lock);
2279 list_for_each_entry(video, &video_bus_head, entry)
2280 acpi_video_bus_unregister_backlight(video);
2281 mutex_unlock(&video_list_lock);
2283 mutex_unlock(®ister_count_mutex);
2286 bool acpi_video_handles_brightness_key_presses(void)
2288 bool have_video_busses;
2290 mutex_lock(&video_list_lock);
2291 have_video_busses = !list_empty(&video_bus_head);
2292 mutex_unlock(&video_list_lock);
2294 return have_video_busses &&
2295 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2297 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2300 * This is kind of nasty. Hardware using Intel chipsets may require
2301 * the video opregion code to be run first in order to initialise
2302 * state before any ACPI video calls are made. To handle this we defer
2303 * registration of the video class until the opregion code has run.
2306 static int __init acpi_video_init(void)
2309 * Let the module load even if ACPI is disabled (e.g. due to
2310 * a broken BIOS) so that i915.ko can still be loaded on such
2311 * old systems without an AcpiOpRegion.
2313 * acpi_video_register() will report -ENODEV later as well due
2314 * to acpi_disabled when i915.ko tries to register itself afterwards.
2319 if (intel_opregion_present())
2322 return acpi_video_register();
2325 static void __exit acpi_video_exit(void)
2327 acpi_video_detect_exit();
2328 acpi_video_unregister();
2333 module_init(acpi_video_init);
2334 module_exit(acpi_video_exit);