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 #define pr_fmt(fmt) "ACPI: video: " fmt
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/input.h>
19 #include <linux/backlight.h>
20 #include <linux/thermal.h>
21 #include <linux/sort.h>
22 #include <linux/pci.h>
23 #include <linux/pci_ids.h>
24 #include <linux/slab.h>
25 #include <linux/dmi.h>
26 #include <linux/suspend.h>
27 #include <linux/acpi.h>
28 #include <acpi/video.h>
29 #include <linux/uaccess.h>
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
34 #define MAX_NAME_LEN 20
36 MODULE_AUTHOR("Bruno Ducrot");
37 MODULE_DESCRIPTION("ACPI Video Driver");
38 MODULE_LICENSE("GPL");
40 static bool brightness_switch_enabled = true;
41 module_param(brightness_switch_enabled, bool, 0644);
44 * By default, we don't allow duplicate ACPI video bus devices
45 * under the same VGA controller
47 static bool allow_duplicates;
48 module_param(allow_duplicates, bool, 0644);
50 #define REPORT_OUTPUT_KEY_EVENTS 0x01
51 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
52 static int report_key_events = -1;
53 module_param(report_key_events, int, 0644);
54 MODULE_PARM_DESC(report_key_events,
55 "0: none, 1: output changes, 2: brightness changes, 3: all");
57 static int hw_changes_brightness = -1;
58 module_param(hw_changes_brightness, int, 0644);
59 MODULE_PARM_DESC(hw_changes_brightness,
60 "Set this to 1 on buggy hw which changes the brightness itself when "
61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
65 * assumed even if not actually set.
67 static bool device_id_scheme = false;
68 module_param(device_id_scheme, bool, 0444);
70 static int only_lcd = -1;
71 module_param(only_lcd, int, 0444);
73 static bool may_report_brightness_keys;
74 static int register_count;
75 static DEFINE_MUTEX(register_count_mutex);
76 static DEFINE_MUTEX(video_list_lock);
77 static LIST_HEAD(video_bus_head);
78 static int acpi_video_bus_add(struct acpi_device *device);
79 static void acpi_video_bus_remove(struct acpi_device *device);
80 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
83 * Indices in the _BCL method response: the first two items are special,
84 * the rest are all supported levels.
86 * See page 575 of the ACPI spec 3.0
88 enum acpi_video_level_idx {
89 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
90 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
91 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
94 static const struct acpi_device_id video_device_ids[] = {
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100 static struct acpi_driver acpi_video_bus = {
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .notify = acpi_video_bus_notify,
111 struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
118 struct acpi_video_bus_cap {
119 u8 _DOS:1; /* Enable/Disable output switching */
120 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /* Get ROM Data */
122 u8 _GPD:1; /* Get POST Device */
123 u8 _SPD:1; /* Set POST Device */
124 u8 _VPO:1; /* Video POST Options */
128 struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /* This field differentiates the display type */
131 u32 display_type:4; /* Describe the specific type in use */
132 u32 vendor_specific:4; /* Chipset Vendor Specific */
133 u32 bios_can_detect:1; /* BIOS can detect the device */
134 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
136 u32 pipe_id:3; /* For VGA multiple-head devices. */
137 u32 reserved:10; /* Must be 0 */
140 * The device ID might not actually follow the scheme described by this
141 * struct acpi_video_device_attrib. If it does, then this bit
142 * device_id_scheme is set; otherwise, other fields should be ignored.
144 * (but also see the global flag device_id_scheme)
146 u32 device_id_scheme:1;
149 struct acpi_video_enumerated_device {
152 struct acpi_video_device_attrib attrib;
154 struct acpi_video_device *bind_info;
157 struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
161 struct acpi_video_enumerated_device *attached_array;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
174 struct acpi_video_device_flags {
185 struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
194 struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct delayed_work switch_brightness_work;
200 int switch_brightness_event;
201 struct acpi_video_bus *video;
202 struct acpi_device *dev;
203 struct acpi_video_device_brightness *brightness;
204 struct backlight_device *backlight;
205 struct thermal_cooling_device *cooling_dev;
208 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
209 static void acpi_video_device_rebind(struct acpi_video_bus *video);
210 static void acpi_video_device_bind(struct acpi_video_bus *video,
211 struct acpi_video_device *device);
212 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
213 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
215 static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device *device,
217 unsigned long long *level, bool raw);
218 static int acpi_video_get_next_level(struct acpi_video_device *device,
219 u32 level_current, u32 event);
220 static void acpi_video_switch_brightness(struct work_struct *work);
222 /* backlight device sysfs support */
223 static int acpi_video_get_brightness(struct backlight_device *bd)
225 unsigned long long cur_level;
227 struct acpi_video_device *vd = bl_get_data(bd);
229 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
231 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
232 if (vd->brightness->levels[i] == cur_level)
233 return i - ACPI_VIDEO_FIRST_LEVEL;
238 static int acpi_video_set_brightness(struct backlight_device *bd)
240 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
241 struct acpi_video_device *vd = bl_get_data(bd);
243 cancel_delayed_work(&vd->switch_brightness_work);
244 return acpi_video_device_lcd_set_level(vd,
245 vd->brightness->levels[request_level]);
248 static const struct backlight_ops acpi_backlight_ops = {
249 .get_brightness = acpi_video_get_brightness,
250 .update_status = acpi_video_set_brightness,
253 /* thermal cooling device callbacks */
254 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
255 unsigned long *state)
257 struct acpi_device *device = cooling_dev->devdata;
258 struct acpi_video_device *video = acpi_driver_data(device);
260 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
264 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
265 unsigned long *state)
267 struct acpi_device *device = cooling_dev->devdata;
268 struct acpi_video_device *video = acpi_driver_data(device);
269 unsigned long long level;
272 if (acpi_video_device_lcd_get_level_current(video, &level, false))
274 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
276 if (level == video->brightness->levels[offset]) {
277 *state = video->brightness->count - offset - 1;
285 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
287 struct acpi_device *device = cooling_dev->devdata;
288 struct acpi_video_device *video = acpi_driver_data(device);
291 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
294 state = video->brightness->count - state;
295 level = video->brightness->levels[state - 1];
296 return acpi_video_device_lcd_set_level(video, level);
299 static const struct thermal_cooling_device_ops video_cooling_ops = {
300 .get_max_state = video_get_max_state,
301 .get_cur_state = video_get_cur_state,
302 .set_cur_state = video_set_cur_state,
306 * --------------------------------------------------------------------------
308 * --------------------------------------------------------------------------
312 acpi_video_device_lcd_query_levels(acpi_handle handle,
313 union acpi_object **levels)
316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
317 union acpi_object *obj;
322 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
323 if (ACPI_FAILURE(status))
325 obj = (union acpi_object *)buffer.pointer;
326 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
327 acpi_handle_info(handle, "Invalid _BCL data\n");
337 kfree(buffer.pointer);
343 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
348 status = acpi_execute_simple_method(device->dev->handle,
350 if (ACPI_FAILURE(status)) {
351 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
355 device->brightness->curr = level;
356 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
358 if (level == device->brightness->levels[state]) {
359 if (device->backlight)
360 device->backlight->props.brightness =
361 state - ACPI_VIDEO_FIRST_LEVEL;
365 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
370 * For some buggy _BQC methods, we need to add a constant value to
371 * the _BQC return value to get the actual current brightness level
374 static int bqc_offset_aml_bug_workaround;
375 static int video_set_bqc_offset(const struct dmi_system_id *d)
377 bqc_offset_aml_bug_workaround = 9;
381 static int video_set_device_id_scheme(const struct dmi_system_id *d)
383 device_id_scheme = true;
387 static int video_enable_only_lcd(const struct dmi_system_id *d)
393 static int video_set_report_key_events(const struct dmi_system_id *id)
395 if (report_key_events == -1)
396 report_key_events = (uintptr_t)id->driver_data;
400 static int video_hw_changes_brightness(
401 const struct dmi_system_id *d)
403 if (hw_changes_brightness == -1)
404 hw_changes_brightness = 1;
408 static const struct dmi_system_id video_dmi_table[] = {
410 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
413 .callback = video_set_bqc_offset,
414 .ident = "Acer Aspire 5720",
416 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
421 .callback = video_set_bqc_offset,
422 .ident = "Acer Aspire 5710Z",
424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
429 .callback = video_set_bqc_offset,
430 .ident = "eMachines E510",
432 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
433 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
437 .callback = video_set_bqc_offset,
438 .ident = "Acer Aspire 5315",
440 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
441 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
445 .callback = video_set_bqc_offset,
446 .ident = "Acer Aspire 7720",
448 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
449 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
454 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
455 * but the IDs actually follow the Device ID Scheme.
458 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
459 .callback = video_set_device_id_scheme,
460 .ident = "ESPRIMO Mobile M9410",
462 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
467 * Some machines have multiple video output devices, but only the one
468 * that is the type of LCD can do the backlight control so we should not
469 * register backlight interface for other video output devices.
472 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
473 .callback = video_enable_only_lcd,
474 .ident = "ESPRIMO Mobile M9410",
476 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
477 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
481 * Some machines report wrong key events on the acpi-bus, suppress
482 * key event reporting on these. Note this is only intended to work
483 * around events which are plain wrong. In some cases we get double
484 * events, in this case acpi-video is considered the canonical source
485 * and the events from the other source should be filtered. E.g.
486 * by calling acpi_video_handles_brightness_key_presses() from the
487 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
490 .callback = video_set_report_key_events,
491 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
492 .ident = "Dell Vostro V131",
494 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
495 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
499 .callback = video_set_report_key_events,
500 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
501 .ident = "Dell Vostro 3350",
503 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
504 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
508 * Some machines change the brightness themselves when a brightness
509 * hotkey gets pressed, despite us telling them not to. In this case
510 * acpi_video_device_notify() should only call backlight_force_update(
511 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
514 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
515 .callback = video_hw_changes_brightness,
516 .ident = "Packard Bell EasyNote MZ35",
518 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
525 static unsigned long long
526 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
527 unsigned long long bqc_value)
529 unsigned long long level;
531 if (device->brightness->flags._BQC_use_index) {
533 * _BQC returns an index that doesn't account for the first 2
534 * items with special meaning (see enum acpi_video_level_idx),
535 * so we need to compensate for that by offsetting ourselves
537 if (device->brightness->flags._BCL_reversed)
538 bqc_value = device->brightness->count -
539 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
541 level = device->brightness->levels[bqc_value +
542 ACPI_VIDEO_FIRST_LEVEL];
547 level += bqc_offset_aml_bug_workaround;
553 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
554 unsigned long long *level, bool raw)
556 acpi_status status = AE_OK;
559 if (device->cap._BQC || device->cap._BCQ) {
560 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
562 status = acpi_evaluate_integer(device->dev->handle, buf,
564 if (ACPI_SUCCESS(status)) {
567 * Caller has indicated he wants the raw
568 * value returned by _BQC, so don't furtherly
569 * mess with the value.
574 *level = acpi_video_bqc_value_to_level(device, *level);
576 for (i = ACPI_VIDEO_FIRST_LEVEL;
577 i < device->brightness->count; i++)
578 if (device->brightness->levels[i] == *level) {
579 device->brightness->curr = *level;
583 * BQC returned an invalid level.
586 acpi_handle_info(device->dev->handle,
587 "%s returned an invalid level", buf);
588 device->cap._BQC = device->cap._BCQ = 0;
592 * should we return an error or ignore this failure?
593 * dev->brightness->curr is a cached value which stores
594 * the correct current backlight level in most cases.
595 * ACPI video backlight still works w/ buggy _BQC.
596 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
598 acpi_handle_info(device->dev->handle,
599 "%s evaluation failed", buf);
600 device->cap._BQC = device->cap._BCQ = 0;
604 *level = device->brightness->curr;
609 acpi_video_device_EDID(struct acpi_video_device *device,
610 union acpi_object **edid, ssize_t length)
613 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
614 union acpi_object *obj;
615 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
616 struct acpi_object_list args = { 1, &arg0 };
624 arg0.integer.value = 1;
625 else if (length == 256)
626 arg0.integer.value = 2;
630 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
631 if (ACPI_FAILURE(status))
634 obj = buffer.pointer;
636 if (obj && obj->type == ACPI_TYPE_BUFFER)
639 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
651 * video : video bus device pointer
653 * 0. The system BIOS should NOT automatically switch(toggle)
654 * the active display output.
655 * 1. The system BIOS should automatically switch (toggle) the
656 * active display output. No switch event.
657 * 2. The _DGS value should be locked.
658 * 3. The system BIOS should not automatically switch (toggle) the
659 * active display output, but instead generate the display switch
662 * 0. The system BIOS should automatically control the brightness level
664 * - the power changes from AC to DC (ACPI appendix B)
665 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
666 * 1. The system BIOS should NOT automatically control the brightness
667 * level of the LCD when:
668 * - the power changes from AC to DC (ACPI appendix B)
669 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
675 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
679 if (!video->cap._DOS)
682 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
684 video->dos_setting = (lcd_flag << 2) | bios_flag;
685 status = acpi_execute_simple_method(video->device->handle, "_DOS",
686 (lcd_flag << 2) | bios_flag);
687 if (ACPI_FAILURE(status))
694 * Simple comparison function used to sort backlight levels.
698 acpi_video_cmp_level(const void *a, const void *b)
700 return *(int *)a - *(int *)b;
704 * Decides if _BQC/_BCQ for this system is usable
706 * We do this by changing the level first and then read out the current
707 * brightness level, if the value does not match, find out if it is using
708 * index. If not, clear the _BQC/_BCQ capability.
710 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
711 int max_level, int current_level)
713 struct acpi_video_device_brightness *br = device->brightness;
715 unsigned long long level;
718 /* don't mess with existing known broken systems */
719 if (bqc_offset_aml_bug_workaround)
723 * Some systems always report current brightness level as maximum
724 * through _BQC, we need to test another value for them. However,
725 * there is a subtlety:
727 * If the _BCL package ordering is descending, the first level
728 * (br->levels[2]) is likely to be 0, and if the number of levels
729 * matches the number of steps, we might confuse a returned level to
734 * current_level = max_level = 100
736 * returned level = 100
738 * In this case 100 means the level, not the index, and _BCM failed.
739 * Still, if the _BCL package ordering is descending, the index of
740 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
742 * This causes all _BQC calls to return bogus values causing weird
743 * behavior from the user's perspective. For example:
745 * xbacklight -set 10; xbacklight -set 20;
747 * would flash to 90% and then slowly down to the desired level (20).
749 * The solution is simple; test anything other than the first level
752 test_level = current_level == max_level
753 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
756 result = acpi_video_device_lcd_set_level(device, test_level);
760 result = acpi_video_device_lcd_get_level_current(device, &level, true);
764 if (level != test_level) {
765 /* buggy _BQC found, need to find out if it uses index */
766 if (level < br->count) {
767 if (br->flags._BCL_reversed)
768 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
769 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
770 br->flags._BQC_use_index = 1;
773 if (!br->flags._BQC_use_index)
774 device->cap._BQC = device->cap._BCQ = 0;
780 int acpi_video_get_levels(struct acpi_device *device,
781 struct acpi_video_device_brightness **dev_br,
784 union acpi_object *obj = NULL;
785 int i, max_level = 0, count = 0, level_ac_battery = 0;
786 union acpi_object *o;
787 struct acpi_video_device_brightness *br = NULL;
791 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
792 acpi_handle_debug(device->handle,
793 "Could not query available LCD brightness level\n");
798 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
803 br = kzalloc(sizeof(*br), GFP_KERNEL);
810 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
811 * in order to account for buggy BIOS which don't export the first two
812 * special levels (see below)
814 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
822 for (i = 0; i < obj->package.count; i++) {
823 o = (union acpi_object *)&obj->package.elements[i];
824 if (o->type != ACPI_TYPE_INTEGER) {
825 acpi_handle_info(device->handle, "Invalid data\n");
828 value = (u32) o->integer.value;
829 /* Skip duplicate entries */
830 if (count > ACPI_VIDEO_FIRST_LEVEL
831 && br->levels[count - 1] == value)
834 br->levels[count] = value;
836 if (br->levels[count] > max_level)
837 max_level = br->levels[count];
842 * some buggy BIOS don't export the levels
843 * when machine is on AC/Battery in _BCL package.
844 * In this case, the first two elements in _BCL packages
845 * are also supported brightness levels that OS should take care of.
847 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
848 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
850 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
854 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
855 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
856 br->flags._BCL_no_ac_battery_levels = 1;
857 for (i = (count - 1 + level_ac_battery);
858 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
859 br->levels[i] = br->levels[i - level_ac_battery];
860 count += level_ac_battery;
861 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
862 acpi_handle_info(device->handle,
863 "Too many duplicates in _BCL package");
865 /* Check if the _BCL package is in a reversed order */
866 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
867 br->flags._BCL_reversed = 1;
868 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
869 count - ACPI_VIDEO_FIRST_LEVEL,
870 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
871 acpi_video_cmp_level, NULL);
872 } else if (max_level != br->levels[count - 1])
873 acpi_handle_info(device->handle,
874 "Found unordered _BCL package");
879 *pmax_level = max_level;
888 EXPORT_SYMBOL(acpi_video_get_levels);
892 * device : video output device (LCD, CRT, ..)
895 * Maximum brightness level
897 * Allocate and initialize device->brightness.
901 acpi_video_init_brightness(struct acpi_video_device *device)
903 int i, max_level = 0;
904 unsigned long long level, level_old;
905 struct acpi_video_device_brightness *br = NULL;
908 result = acpi_video_get_levels(device->dev, &br, &max_level);
911 device->brightness = br;
913 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
914 br->curr = level = max_level;
916 if (!device->cap._BQC)
919 result = acpi_video_device_lcd_get_level_current(device,
922 goto out_free_levels;
924 result = acpi_video_bqc_quirk(device, max_level, level_old);
926 goto out_free_levels;
928 * cap._BQC may get cleared due to _BQC is found to be broken
929 * in acpi_video_bqc_quirk, so check again here.
931 if (!device->cap._BQC)
934 level = acpi_video_bqc_value_to_level(device, level_old);
936 * On some buggy laptops, _BQC returns an uninitialized
937 * value when invoked for the first time, i.e.
938 * level_old is invalid (no matter whether it's a level
939 * or an index). Set the backlight to max_level in this case.
941 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
942 if (level == br->levels[i])
944 if (i == br->count || !level)
948 result = acpi_video_device_lcd_set_level(device, level);
950 goto out_free_levels;
952 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
953 br->count - ACPI_VIDEO_FIRST_LEVEL);
960 device->brightness = NULL;
966 * device : video output device (LCD, CRT, ..)
971 * Find out all required AML methods defined under the output
975 static void acpi_video_device_find_cap(struct acpi_video_device *device)
977 if (acpi_has_method(device->dev->handle, "_ADR"))
978 device->cap._ADR = 1;
979 if (acpi_has_method(device->dev->handle, "_BCL"))
980 device->cap._BCL = 1;
981 if (acpi_has_method(device->dev->handle, "_BCM"))
982 device->cap._BCM = 1;
983 if (acpi_has_method(device->dev->handle, "_BQC")) {
984 device->cap._BQC = 1;
985 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
986 acpi_handle_info(device->dev->handle,
987 "_BCQ is used instead of _BQC\n");
988 device->cap._BCQ = 1;
991 if (acpi_has_method(device->dev->handle, "_DDC"))
992 device->cap._DDC = 1;
997 * device : video output device (VGA)
1002 * Find out all required AML methods defined under the video bus device.
1005 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1007 if (acpi_has_method(video->device->handle, "_DOS"))
1008 video->cap._DOS = 1;
1009 if (acpi_has_method(video->device->handle, "_DOD"))
1010 video->cap._DOD = 1;
1011 if (acpi_has_method(video->device->handle, "_ROM"))
1012 video->cap._ROM = 1;
1013 if (acpi_has_method(video->device->handle, "_GPD"))
1014 video->cap._GPD = 1;
1015 if (acpi_has_method(video->device->handle, "_SPD"))
1016 video->cap._SPD = 1;
1017 if (acpi_has_method(video->device->handle, "_VPO"))
1018 video->cap._VPO = 1;
1022 * Check whether the video bus device has required AML method to
1023 * support the desired features
1026 static int acpi_video_bus_check(struct acpi_video_bus *video)
1028 acpi_status status = -ENOENT;
1029 struct pci_dev *dev;
1034 dev = acpi_get_pci_dev(video->device->handle);
1040 * Since there is no HID, CID and so on for VGA driver, we have
1041 * to check well known required nodes.
1044 /* Does this device support video switching? */
1045 if (video->cap._DOS || video->cap._DOD) {
1046 if (!video->cap._DOS) {
1047 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1048 acpi_device_bid(video->device));
1050 video->flags.multihead = 1;
1054 /* Does this device support retrieving a video ROM? */
1055 if (video->cap._ROM) {
1056 video->flags.rom = 1;
1060 /* Does this device support configuring which video device to POST? */
1061 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1062 video->flags.post = 1;
1070 * --------------------------------------------------------------------------
1072 * --------------------------------------------------------------------------
1075 /* device interface */
1076 static struct acpi_video_device_attrib *
1077 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1079 struct acpi_video_enumerated_device *ids;
1082 for (i = 0; i < video->attached_count; i++) {
1083 ids = &video->attached_array[i];
1084 if ((ids->value.int_val & 0xffff) == device_id)
1085 return &ids->value.attrib;
1092 acpi_video_get_device_type(struct acpi_video_bus *video,
1093 unsigned long device_id)
1095 struct acpi_video_enumerated_device *ids;
1098 for (i = 0; i < video->attached_count; i++) {
1099 ids = &video->attached_array[i];
1100 if ((ids->value.int_val & 0xffff) == device_id)
1101 return ids->value.int_val;
1107 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
1109 struct acpi_video_bus *video = arg;
1110 struct acpi_video_device_attrib *attribute;
1111 struct acpi_video_device *data;
1112 unsigned long long device_id;
1116 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1117 /* Skip devices without _ADR instead of failing. */
1118 if (ACPI_FAILURE(status))
1121 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1123 dev_dbg(&device->dev, "Cannot attach\n");
1127 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1128 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1129 device->driver_data = data;
1131 data->device_id = device_id;
1132 data->video = video;
1134 INIT_DELAYED_WORK(&data->switch_brightness_work,
1135 acpi_video_switch_brightness);
1137 attribute = acpi_video_get_device_attr(video, device_id);
1139 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1140 switch (attribute->display_type) {
1141 case ACPI_VIDEO_DISPLAY_CRT:
1142 data->flags.crt = 1;
1144 case ACPI_VIDEO_DISPLAY_TV:
1145 data->flags.tvout = 1;
1147 case ACPI_VIDEO_DISPLAY_DVI:
1148 data->flags.dvi = 1;
1150 case ACPI_VIDEO_DISPLAY_LCD:
1151 data->flags.lcd = 1;
1154 data->flags.unknown = 1;
1157 if (attribute->bios_can_detect)
1158 data->flags.bios = 1;
1160 /* Check for legacy IDs */
1161 device_type = acpi_video_get_device_type(video, device_id);
1162 /* Ignore bits 16 and 18-20 */
1163 switch (device_type & 0xffe2ffff) {
1164 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1165 data->flags.crt = 1;
1167 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1168 data->flags.lcd = 1;
1170 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1171 data->flags.tvout = 1;
1174 data->flags.unknown = 1;
1178 acpi_video_device_bind(video, data);
1179 acpi_video_device_find_cap(data);
1181 if (data->cap._BCM && data->cap._BCL)
1182 may_report_brightness_keys = true;
1184 mutex_lock(&video->device_list_lock);
1185 list_add_tail(&data->entry, &video->video_device_list);
1186 mutex_unlock(&video->device_list_lock);
1189 video->child_count++;
1195 * video : video bus device
1200 * Enumerate the video device list of the video bus,
1201 * bind the ids with the corresponding video devices
1202 * under the video bus.
1205 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1207 struct acpi_video_device *dev;
1209 mutex_lock(&video->device_list_lock);
1211 list_for_each_entry(dev, &video->video_device_list, entry)
1212 acpi_video_device_bind(video, dev);
1214 mutex_unlock(&video->device_list_lock);
1219 * video : video bus device
1220 * device : video output device under the video
1226 * Bind the ids with the corresponding video devices
1227 * under the video bus.
1231 acpi_video_device_bind(struct acpi_video_bus *video,
1232 struct acpi_video_device *device)
1234 struct acpi_video_enumerated_device *ids;
1237 for (i = 0; i < video->attached_count; i++) {
1238 ids = &video->attached_array[i];
1239 if (device->device_id == (ids->value.int_val & 0xffff)) {
1240 ids->bind_info = device;
1241 acpi_handle_debug(video->device->handle, "%s: %d\n",
1247 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1249 struct acpi_video_bus *video = device->video;
1253 * If we have a broken _DOD or we have more than 8 output devices
1254 * under the graphics controller node that we can't proper deal with
1255 * in the operation region code currently, no need to test.
1257 if (!video->attached_count || video->child_count > 8)
1260 for (i = 0; i < video->attached_count; i++) {
1261 if ((video->attached_array[i].value.int_val & 0xfff) ==
1262 (device->device_id & 0xfff))
1271 * video : video bus device
1276 * Call _DOD to enumerate all devices attached to display adapter
1280 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1285 struct acpi_video_enumerated_device *active_list;
1286 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1287 union acpi_object *dod = NULL;
1288 union acpi_object *obj;
1290 if (!video->cap._DOD)
1291 return AE_NOT_EXIST;
1293 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1294 if (ACPI_FAILURE(status)) {
1295 acpi_handle_info(video->device->handle,
1296 "_DOD evaluation failed: %s\n",
1297 acpi_format_exception(status));
1301 dod = buffer.pointer;
1302 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1303 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1308 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1309 dod->package.count);
1311 active_list = kcalloc(1 + dod->package.count,
1312 sizeof(struct acpi_video_enumerated_device),
1320 for (i = 0; i < dod->package.count; i++) {
1321 obj = &dod->package.elements[i];
1323 if (obj->type != ACPI_TYPE_INTEGER) {
1324 acpi_handle_info(video->device->handle,
1325 "Invalid _DOD data in element %d\n", i);
1329 active_list[count].value.int_val = obj->integer.value;
1330 active_list[count].bind_info = NULL;
1332 acpi_handle_debug(video->device->handle,
1333 "_DOD element[%d] = %d\n", i,
1334 (int)obj->integer.value);
1339 kfree(video->attached_array);
1341 video->attached_array = active_list;
1342 video->attached_count = count;
1345 kfree(buffer.pointer);
1350 acpi_video_get_next_level(struct acpi_video_device *device,
1351 u32 level_current, u32 event)
1353 int min, max, min_above, max_below, i, l, delta = 255;
1354 max = max_below = 0;
1355 min = min_above = 255;
1356 /* Find closest level to level_current */
1357 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1358 l = device->brightness->levels[i];
1359 if (abs(l - level_current) < abs(delta)) {
1360 delta = l - level_current;
1365 /* Adjust level_current to closest available level */
1366 level_current += delta;
1367 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1368 l = device->brightness->levels[i];
1373 if (l < min_above && l > level_current)
1375 if (l > max_below && l < level_current)
1380 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1381 return (level_current < max) ? min_above : min;
1382 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1383 return (level_current < max) ? min_above : max;
1384 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1385 return (level_current > min) ? max_below : min;
1386 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1387 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1390 return level_current;
1395 acpi_video_switch_brightness(struct work_struct *work)
1397 struct acpi_video_device *device = container_of(to_delayed_work(work),
1398 struct acpi_video_device, switch_brightness_work);
1399 unsigned long long level_current, level_next;
1400 int event = device->switch_brightness_event;
1401 int result = -EINVAL;
1403 /* no warning message if acpi_backlight=vendor or a quirk is used */
1404 if (!device->backlight)
1407 if (!device->brightness)
1410 result = acpi_video_device_lcd_get_level_current(device,
1416 level_next = acpi_video_get_next_level(device, level_current, event);
1418 result = acpi_video_device_lcd_set_level(device, level_next);
1421 backlight_force_update(device->backlight,
1422 BACKLIGHT_UPDATE_HOTKEY);
1426 acpi_handle_info(device->dev->handle,
1427 "Failed to switch brightness\n");
1430 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1433 struct acpi_video_bus *video;
1434 struct acpi_video_device *video_device;
1435 union acpi_object *buffer = NULL;
1439 if (!device || !acpi_driver_data(device))
1442 video = acpi_driver_data(device);
1444 for (i = 0; i < video->attached_count; i++) {
1445 video_device = video->attached_array[i].bind_info;
1451 if (!video_device->cap._DDC)
1456 case ACPI_VIDEO_DISPLAY_CRT:
1457 if (!video_device->flags.crt)
1460 case ACPI_VIDEO_DISPLAY_TV:
1461 if (!video_device->flags.tvout)
1464 case ACPI_VIDEO_DISPLAY_DVI:
1465 if (!video_device->flags.dvi)
1468 case ACPI_VIDEO_DISPLAY_LCD:
1469 if (!video_device->flags.lcd)
1473 } else if (video_device->device_id != device_id) {
1477 status = acpi_video_device_EDID(video_device, &buffer, length);
1479 if (ACPI_FAILURE(status) || !buffer ||
1480 buffer->type != ACPI_TYPE_BUFFER) {
1482 status = acpi_video_device_EDID(video_device, &buffer,
1484 if (ACPI_FAILURE(status) || !buffer ||
1485 buffer->type != ACPI_TYPE_BUFFER) {
1490 *edid = buffer->buffer.pointer;
1496 EXPORT_SYMBOL(acpi_video_get_edid);
1499 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1500 struct acpi_device *device)
1503 * There are systems where video module known to work fine regardless
1504 * of broken _DOD and ignoring returned value here doesn't cause
1507 acpi_video_device_enumerate(video);
1509 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
1512 /* acpi_video interface */
1515 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1516 * perform any automatic brightness change on receiving a notification.
1518 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1520 return acpi_video_bus_DOS(video, 0,
1521 acpi_osi_is_win8() ? 1 : 0);
1524 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1526 return acpi_video_bus_DOS(video, 0,
1527 acpi_osi_is_win8() ? 0 : 1);
1530 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1532 struct acpi_video_bus *video = acpi_driver_data(device);
1533 struct input_dev *input;
1536 if (!video || !video->input)
1539 input = video->input;
1542 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1543 * most likely via hotkey. */
1544 keycode = KEY_SWITCHVIDEOMODE;
1547 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1549 acpi_video_device_enumerate(video);
1550 acpi_video_device_rebind(video);
1551 keycode = KEY_SWITCHVIDEOMODE;
1554 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1555 keycode = KEY_SWITCHVIDEOMODE;
1557 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1558 keycode = KEY_VIDEO_NEXT;
1560 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1561 keycode = KEY_VIDEO_PREV;
1565 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1570 if (acpi_notifier_call_chain(device, event, 0))
1571 /* Something vetoed the keypress. */
1574 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1575 input_report_key(input, keycode, 1);
1577 input_report_key(input, keycode, 0);
1582 static void brightness_switch_event(struct acpi_video_device *video_device,
1585 if (!brightness_switch_enabled)
1588 video_device->switch_brightness_event = event;
1589 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1592 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1594 struct acpi_video_device *video_device = data;
1595 struct acpi_device *device = NULL;
1596 struct acpi_video_bus *bus;
1597 struct input_dev *input;
1603 device = video_device->dev;
1604 bus = video_device->video;
1607 if (hw_changes_brightness > 0) {
1608 if (video_device->backlight)
1609 backlight_force_update(video_device->backlight,
1610 BACKLIGHT_UPDATE_HOTKEY);
1611 acpi_notifier_call_chain(device, event, 0);
1616 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1617 brightness_switch_event(video_device, event);
1618 keycode = KEY_BRIGHTNESS_CYCLE;
1620 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1621 brightness_switch_event(video_device, event);
1622 keycode = KEY_BRIGHTNESSUP;
1624 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1625 brightness_switch_event(video_device, event);
1626 keycode = KEY_BRIGHTNESSDOWN;
1628 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1629 brightness_switch_event(video_device, event);
1630 keycode = KEY_BRIGHTNESS_ZERO;
1632 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1633 brightness_switch_event(video_device, event);
1634 keycode = KEY_DISPLAY_OFF;
1637 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1642 may_report_brightness_keys = true;
1644 acpi_notifier_call_chain(device, event, 0);
1646 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1647 input_report_key(input, keycode, 1);
1649 input_report_key(input, keycode, 0);
1654 static int acpi_video_resume(struct notifier_block *nb,
1655 unsigned long val, void *ign)
1657 struct acpi_video_bus *video;
1658 struct acpi_video_device *video_device;
1662 case PM_POST_HIBERNATION:
1663 case PM_POST_SUSPEND:
1664 case PM_POST_RESTORE:
1665 video = container_of(nb, struct acpi_video_bus, pm_nb);
1667 dev_info(&video->device->dev, "Restoring backlight state\n");
1669 for (i = 0; i < video->attached_count; i++) {
1670 video_device = video->attached_array[i].bind_info;
1671 if (video_device && video_device->brightness)
1672 acpi_video_device_lcd_set_level(video_device,
1673 video_device->brightness->curr);
1682 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1683 void **return_value)
1685 struct acpi_device *device = context;
1686 struct acpi_device *sibling;
1688 if (handle == device->handle)
1689 return AE_CTRL_TERMINATE;
1691 sibling = acpi_fetch_acpi_dev(handle);
1695 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1696 return AE_ALREADY_EXISTS;
1701 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1703 struct backlight_properties props;
1704 struct pci_dev *pdev;
1705 acpi_handle acpi_parent;
1706 struct device *parent = NULL;
1711 result = acpi_video_init_brightness(device);
1715 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1720 acpi_get_parent(device->dev->handle, &acpi_parent);
1722 pdev = acpi_get_pci_dev(acpi_parent);
1724 parent = &pdev->dev;
1728 memset(&props, 0, sizeof(struct backlight_properties));
1729 props.type = BACKLIGHT_FIRMWARE;
1730 props.max_brightness =
1731 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1732 device->backlight = backlight_device_register(name,
1735 &acpi_backlight_ops,
1738 if (IS_ERR(device->backlight)) {
1739 device->backlight = NULL;
1744 * Save current brightness level in case we have to restore it
1745 * before acpi_video_device_lcd_set_level() is called next time.
1747 device->backlight->props.brightness =
1748 acpi_video_get_brightness(device->backlight);
1750 device->cooling_dev = thermal_cooling_device_register("LCD",
1751 device->dev, &video_cooling_ops);
1752 if (IS_ERR(device->cooling_dev)) {
1754 * Set cooling_dev to NULL so we don't crash trying to free it.
1755 * Also, why the hell we are returning early and not attempt to
1756 * register video output if cooling device registration failed?
1759 device->cooling_dev = NULL;
1763 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1764 device->cooling_dev->id);
1765 result = sysfs_create_link(&device->dev->dev.kobj,
1766 &device->cooling_dev->device.kobj,
1769 pr_info("sysfs link creation failed\n");
1771 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1772 &device->dev->dev.kobj, "device");
1774 pr_info("Reverse sysfs link creation failed\n");
1777 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1779 struct acpi_video_device *dev;
1780 union acpi_object *levels;
1782 mutex_lock(&video->device_list_lock);
1783 list_for_each_entry(dev, &video->video_device_list, entry) {
1784 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1787 mutex_unlock(&video->device_list_lock);
1790 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1793 * Do not create backlight device for video output
1794 * device that is not in the enumerated list.
1796 if (!acpi_video_device_in_dod(dev)) {
1797 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1802 return dev->flags.lcd;
1806 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1808 struct acpi_video_device *dev;
1810 if (video->backlight_registered)
1813 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1816 mutex_lock(&video->device_list_lock);
1817 list_for_each_entry(dev, &video->video_device_list, entry) {
1818 if (acpi_video_should_register_backlight(dev))
1819 acpi_video_dev_register_backlight(dev);
1821 mutex_unlock(&video->device_list_lock);
1823 video->backlight_registered = true;
1825 video->pm_nb.notifier_call = acpi_video_resume;
1826 video->pm_nb.priority = 0;
1827 return register_pm_notifier(&video->pm_nb);
1830 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1832 if (device->backlight) {
1833 backlight_device_unregister(device->backlight);
1834 device->backlight = NULL;
1836 if (device->brightness) {
1837 kfree(device->brightness->levels);
1838 kfree(device->brightness);
1839 device->brightness = NULL;
1841 if (device->cooling_dev) {
1842 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1843 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1844 thermal_cooling_device_unregister(device->cooling_dev);
1845 device->cooling_dev = NULL;
1849 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1851 struct acpi_video_device *dev;
1854 if (!video->backlight_registered)
1857 error = unregister_pm_notifier(&video->pm_nb);
1859 mutex_lock(&video->device_list_lock);
1860 list_for_each_entry(dev, &video->video_device_list, entry)
1861 acpi_video_dev_unregister_backlight(dev);
1862 mutex_unlock(&video->device_list_lock);
1864 video->backlight_registered = false;
1869 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1872 struct acpi_device *adev = device->dev;
1874 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1875 acpi_video_device_notify, device);
1876 if (ACPI_FAILURE(status))
1877 dev_err(&adev->dev, "Error installing notify handler\n");
1879 device->flags.notify = 1;
1882 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1884 struct input_dev *input;
1885 struct acpi_video_device *dev;
1888 video->input = input = input_allocate_device();
1894 error = acpi_video_bus_start_devices(video);
1896 goto err_free_input;
1898 snprintf(video->phys, sizeof(video->phys),
1899 "%s/video/input0", acpi_device_hid(video->device));
1901 input->name = acpi_device_name(video->device);
1902 input->phys = video->phys;
1903 input->id.bustype = BUS_HOST;
1904 input->id.product = 0x06;
1905 input->dev.parent = &video->device->dev;
1906 input->evbit[0] = BIT(EV_KEY);
1907 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1908 set_bit(KEY_VIDEO_NEXT, input->keybit);
1909 set_bit(KEY_VIDEO_PREV, input->keybit);
1910 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1911 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1912 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1913 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1914 set_bit(KEY_DISPLAY_OFF, input->keybit);
1916 error = input_register_device(input);
1920 mutex_lock(&video->device_list_lock);
1921 list_for_each_entry(dev, &video->video_device_list, entry)
1922 acpi_video_dev_add_notify_handler(dev);
1923 mutex_unlock(&video->device_list_lock);
1928 acpi_video_bus_stop_devices(video);
1930 input_free_device(input);
1931 video->input = NULL;
1936 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1938 if (dev->flags.notify) {
1939 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1940 acpi_video_device_notify);
1941 dev->flags.notify = 0;
1945 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1947 struct acpi_video_device *dev;
1949 mutex_lock(&video->device_list_lock);
1950 list_for_each_entry(dev, &video->video_device_list, entry)
1951 acpi_video_dev_remove_notify_handler(dev);
1952 mutex_unlock(&video->device_list_lock);
1954 acpi_video_bus_stop_devices(video);
1955 input_unregister_device(video->input);
1956 video->input = NULL;
1959 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1961 struct acpi_video_device *dev, *next;
1963 mutex_lock(&video->device_list_lock);
1964 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1965 list_del(&dev->entry);
1968 mutex_unlock(&video->device_list_lock);
1973 static int instance;
1975 static int acpi_video_bus_add(struct acpi_device *device)
1977 struct acpi_video_bus *video;
1982 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1983 acpi_dev_parent(device)->handle, 1,
1984 acpi_video_bus_match, NULL,
1986 if (status == AE_ALREADY_EXISTS) {
1988 "Duplicate ACPI video bus devices for the"
1989 " same VGA controller, please try module "
1990 "parameter \"video.allow_duplicates=1\""
1991 "if the current driver doesn't work.\n");
1992 if (!allow_duplicates)
1996 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2000 /* a hack to fix the duplicate name "VID" problem on T61 */
2001 if (!strcmp(device->pnp.bus_id, "VID")) {
2003 device->pnp.bus_id[3] = '0' + instance;
2006 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2007 if (!strcmp(device->pnp.bus_id, "VGA")) {
2009 device->pnp.bus_id[3] = '0' + instance;
2013 video->device = device;
2014 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2015 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2016 device->driver_data = video;
2018 acpi_video_bus_find_cap(video);
2019 error = acpi_video_bus_check(video);
2021 goto err_free_video;
2023 mutex_init(&video->device_list_lock);
2024 INIT_LIST_HEAD(&video->video_device_list);
2026 error = acpi_video_bus_get_devices(video, device);
2030 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2031 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2032 video->flags.multihead ? "yes" : "no",
2033 video->flags.rom ? "yes" : "no",
2034 video->flags.post ? "yes" : "no");
2035 mutex_lock(&video_list_lock);
2036 list_add_tail(&video->entry, &video_bus_head);
2037 mutex_unlock(&video_list_lock);
2040 * If backlight-type auto-detection is used then a native backlight may
2041 * show up later and this may change the result from video to native.
2042 * Therefor normally the userspace visible /sys/class/backlight device
2043 * gets registered separately by the GPU driver calling
2044 * acpi_video_register_backlight() when an internal panel is detected.
2045 * Register the backlight now when not using auto-detection, so that
2046 * when the kernel cmdline or DMI-quirks are used the backlight will
2047 * get registered even if acpi_video_register_backlight() is not called.
2049 acpi_video_run_bcl_for_osi(video);
2050 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video &&
2052 acpi_video_bus_register_backlight(video);
2054 acpi_video_bus_add_notify_handler(video);
2059 acpi_video_bus_put_devices(video);
2060 kfree(video->attached_array);
2063 device->driver_data = NULL;
2068 static void acpi_video_bus_remove(struct acpi_device *device)
2070 struct acpi_video_bus *video = NULL;
2073 if (!device || !acpi_driver_data(device))
2076 video = acpi_driver_data(device);
2078 mutex_lock(&video_list_lock);
2079 list_del(&video->entry);
2080 mutex_unlock(&video_list_lock);
2082 acpi_video_bus_remove_notify_handler(video);
2083 acpi_video_bus_unregister_backlight(video);
2084 acpi_video_bus_put_devices(video);
2086 kfree(video->attached_array);
2090 static int __init is_i740(struct pci_dev *dev)
2092 if (dev->device == 0x00D1)
2094 if (dev->device == 0x7000)
2099 static int __init intel_opregion_present(void)
2102 struct pci_dev *dev = NULL;
2105 for_each_pci_dev(dev) {
2106 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2108 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2110 /* We don't want to poke around undefined i740 registers */
2113 pci_read_config_dword(dev, 0xfc, &address);
2121 /* Check if the chassis-type indicates there is no builtin LCD panel */
2122 static bool dmi_is_desktop(void)
2124 const char *chassis_type;
2127 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2131 if (kstrtoul(chassis_type, 10, &type) != 0)
2135 case 0x03: /* Desktop */
2136 case 0x04: /* Low Profile Desktop */
2137 case 0x05: /* Pizza Box */
2138 case 0x06: /* Mini Tower */
2139 case 0x07: /* Tower */
2140 case 0x10: /* Lunch Box */
2141 case 0x11: /* Main Server Chassis */
2149 * We're seeing a lot of bogus backlight interfaces on newer machines
2150 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2151 * lcd flag fixes this, enable this by default on any machines which are:
2152 * 1. Win8 ready (where we also prefer the native backlight driver, so
2153 * normally the acpi_video code should not register there anyways); *and*
2154 * 2.1 Report a desktop/server DMI chassis-type, or
2155 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2158 static bool should_check_lcd_flag(void)
2160 if (!acpi_osi_is_win8())
2163 if (dmi_is_desktop())
2166 if (acpi_reduced_hardware())
2172 int acpi_video_register(void)
2176 mutex_lock(®ister_count_mutex);
2177 if (register_count) {
2179 * if the function of acpi_video_register is already called,
2180 * don't register the acpi_video_bus again and return no error.
2186 only_lcd = should_check_lcd_flag();
2188 dmi_check_system(video_dmi_table);
2190 ret = acpi_bus_register_driver(&acpi_video_bus);
2195 * When the acpi_video_bus is loaded successfully, increase
2196 * the counter reference.
2201 mutex_unlock(®ister_count_mutex);
2204 EXPORT_SYMBOL(acpi_video_register);
2206 void acpi_video_unregister(void)
2208 mutex_lock(®ister_count_mutex);
2209 if (register_count) {
2210 acpi_bus_unregister_driver(&acpi_video_bus);
2212 may_report_brightness_keys = false;
2214 mutex_unlock(®ister_count_mutex);
2216 EXPORT_SYMBOL(acpi_video_unregister);
2218 void acpi_video_register_backlight(void)
2220 struct acpi_video_bus *video;
2222 mutex_lock(&video_list_lock);
2223 list_for_each_entry(video, &video_bus_head, entry)
2224 acpi_video_bus_register_backlight(video);
2225 mutex_unlock(&video_list_lock);
2227 EXPORT_SYMBOL(acpi_video_register_backlight);
2229 bool acpi_video_handles_brightness_key_presses(void)
2231 return may_report_brightness_keys &&
2232 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2234 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2237 * This is kind of nasty. Hardware using Intel chipsets may require
2238 * the video opregion code to be run first in order to initialise
2239 * state before any ACPI video calls are made. To handle this we defer
2240 * registration of the video class until the opregion code has run.
2243 static int __init acpi_video_init(void)
2246 * Let the module load even if ACPI is disabled (e.g. due to
2247 * a broken BIOS) so that i915.ko can still be loaded on such
2248 * old systems without an AcpiOpRegion.
2250 * acpi_video_register() will report -ENODEV later as well due
2251 * to acpi_disabled when i915.ko tries to register itself afterwards.
2256 if (intel_opregion_present())
2259 return acpi_video_register();
2262 static void __exit acpi_video_exit(void)
2264 acpi_video_unregister();
2267 module_init(acpi_video_init);
2268 module_exit(acpi_video_exit);