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 static int disable_backlight_sysfs_if = -1;
51 module_param(disable_backlight_sysfs_if, int, 0444);
53 #define REPORT_OUTPUT_KEY_EVENTS 0x01
54 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
55 static int report_key_events = -1;
56 module_param(report_key_events, int, 0644);
57 MODULE_PARM_DESC(report_key_events,
58 "0: none, 1: output changes, 2: brightness changes, 3: all");
60 static int hw_changes_brightness = -1;
61 module_param(hw_changes_brightness, int, 0644);
62 MODULE_PARM_DESC(hw_changes_brightness,
63 "Set this to 1 on buggy hw which changes the brightness itself when "
64 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
67 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
68 * assumed even if not actually set.
70 static bool device_id_scheme = false;
71 module_param(device_id_scheme, bool, 0444);
73 static int only_lcd = -1;
74 module_param(only_lcd, int, 0444);
76 static bool has_backlight;
77 static int register_count;
78 static DEFINE_MUTEX(register_count_mutex);
79 static DEFINE_MUTEX(video_list_lock);
80 static LIST_HEAD(video_bus_head);
81 static int acpi_video_bus_add(struct acpi_device *device);
82 static int acpi_video_bus_remove(struct acpi_device *device);
83 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
84 void acpi_video_detect_exit(void);
87 * Indices in the _BCL method response: the first two items are special,
88 * the rest are all supported levels.
90 * See page 575 of the ACPI spec 3.0
92 enum acpi_video_level_idx {
93 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
94 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
95 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
98 static const struct acpi_device_id video_device_ids[] = {
102 MODULE_DEVICE_TABLE(acpi, video_device_ids);
104 static struct acpi_driver acpi_video_bus = {
106 .class = ACPI_VIDEO_CLASS,
107 .ids = video_device_ids,
109 .add = acpi_video_bus_add,
110 .remove = acpi_video_bus_remove,
111 .notify = acpi_video_bus_notify,
115 struct acpi_video_bus_flags {
116 u8 multihead:1; /* can switch video heads */
117 u8 rom:1; /* can retrieve a video rom */
118 u8 post:1; /* can configure the head to */
122 struct acpi_video_bus_cap {
123 u8 _DOS:1; /* Enable/Disable output switching */
124 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
125 u8 _ROM:1; /* Get ROM Data */
126 u8 _GPD:1; /* Get POST Device */
127 u8 _SPD:1; /* Set POST Device */
128 u8 _VPO:1; /* Video POST Options */
132 struct acpi_video_device_attrib {
133 u32 display_index:4; /* A zero-based instance of the Display */
134 u32 display_port_attachment:4; /* This field differentiates the display type */
135 u32 display_type:4; /* Describe the specific type in use */
136 u32 vendor_specific:4; /* Chipset Vendor Specific */
137 u32 bios_can_detect:1; /* BIOS can detect the device */
138 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
140 u32 pipe_id:3; /* For VGA multiple-head devices. */
141 u32 reserved:10; /* Must be 0 */
144 * The device ID might not actually follow the scheme described by this
145 * struct acpi_video_device_attrib. If it does, then this bit
146 * device_id_scheme is set; otherwise, other fields should be ignored.
148 * (but also see the global flag device_id_scheme)
150 u32 device_id_scheme:1;
153 struct acpi_video_enumerated_device {
156 struct acpi_video_device_attrib attrib;
158 struct acpi_video_device *bind_info;
161 struct acpi_video_bus {
162 struct acpi_device *device;
163 bool backlight_registered;
165 struct acpi_video_enumerated_device *attached_array;
168 struct acpi_video_bus_cap cap;
169 struct acpi_video_bus_flags flags;
170 struct list_head video_device_list;
171 struct mutex device_list_lock; /* protects video_device_list */
172 struct list_head entry;
173 struct input_dev *input;
174 char phys[32]; /* for input device */
175 struct notifier_block pm_nb;
178 struct acpi_video_device_flags {
189 struct acpi_video_device_cap {
190 u8 _ADR:1; /* Return the unique ID */
191 u8 _BCL:1; /* Query list of brightness control levels supported */
192 u8 _BCM:1; /* Set the brightness level */
193 u8 _BQC:1; /* Get current brightness level */
194 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
195 u8 _DDC:1; /* Return the EDID for this device */
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct delayed_work switch_brightness_work;
204 int switch_brightness_event;
205 struct acpi_video_bus *video;
206 struct acpi_device *dev;
207 struct acpi_video_device_brightness *brightness;
208 struct backlight_device *backlight;
209 struct thermal_cooling_device *cooling_dev;
212 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
213 static void acpi_video_device_rebind(struct acpi_video_bus *video);
214 static void acpi_video_device_bind(struct acpi_video_bus *video,
215 struct acpi_video_device *device);
216 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
217 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
219 static int acpi_video_device_lcd_get_level_current(
220 struct acpi_video_device *device,
221 unsigned long long *level, bool raw);
222 static int acpi_video_get_next_level(struct acpi_video_device *device,
223 u32 level_current, u32 event);
224 static void acpi_video_switch_brightness(struct work_struct *work);
226 /* backlight device sysfs support */
227 static int acpi_video_get_brightness(struct backlight_device *bd)
229 unsigned long long cur_level;
231 struct acpi_video_device *vd = bl_get_data(bd);
233 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
235 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
236 if (vd->brightness->levels[i] == cur_level)
237 return i - ACPI_VIDEO_FIRST_LEVEL;
242 static int acpi_video_set_brightness(struct backlight_device *bd)
244 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
245 struct acpi_video_device *vd = bl_get_data(bd);
247 cancel_delayed_work(&vd->switch_brightness_work);
248 return acpi_video_device_lcd_set_level(vd,
249 vd->brightness->levels[request_level]);
252 static const struct backlight_ops acpi_backlight_ops = {
253 .get_brightness = acpi_video_get_brightness,
254 .update_status = acpi_video_set_brightness,
257 /* thermal cooling device callbacks */
258 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
259 unsigned long *state)
261 struct acpi_device *device = cooling_dev->devdata;
262 struct acpi_video_device *video = acpi_driver_data(device);
264 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
268 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
269 unsigned long *state)
271 struct acpi_device *device = cooling_dev->devdata;
272 struct acpi_video_device *video = acpi_driver_data(device);
273 unsigned long long level;
276 if (acpi_video_device_lcd_get_level_current(video, &level, false))
278 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
280 if (level == video->brightness->levels[offset]) {
281 *state = video->brightness->count - offset - 1;
289 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
295 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
298 state = video->brightness->count - state;
299 level = video->brightness->levels[state - 1];
300 return acpi_video_device_lcd_set_level(video, level);
303 static const struct thermal_cooling_device_ops video_cooling_ops = {
304 .get_max_state = video_get_max_state,
305 .get_cur_state = video_get_cur_state,
306 .set_cur_state = video_set_cur_state,
310 * --------------------------------------------------------------------------
312 * --------------------------------------------------------------------------
316 acpi_video_device_lcd_query_levels(acpi_handle handle,
317 union acpi_object **levels)
320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 union acpi_object *obj;
326 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
327 if (ACPI_FAILURE(status))
329 obj = (union acpi_object *)buffer.pointer;
330 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
331 acpi_handle_info(handle, "Invalid _BCL data\n");
341 kfree(buffer.pointer);
347 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
352 status = acpi_execute_simple_method(device->dev->handle,
354 if (ACPI_FAILURE(status)) {
355 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
359 device->brightness->curr = level;
360 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
362 if (level == device->brightness->levels[state]) {
363 if (device->backlight)
364 device->backlight->props.brightness =
365 state - ACPI_VIDEO_FIRST_LEVEL;
369 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
374 * For some buggy _BQC methods, we need to add a constant value to
375 * the _BQC return value to get the actual current brightness level
378 static int bqc_offset_aml_bug_workaround;
379 static int video_set_bqc_offset(const struct dmi_system_id *d)
381 bqc_offset_aml_bug_workaround = 9;
385 static int video_disable_backlight_sysfs_if(
386 const struct dmi_system_id *d)
388 if (disable_backlight_sysfs_if == -1)
389 disable_backlight_sysfs_if = 1;
393 static int video_set_device_id_scheme(const struct dmi_system_id *d)
395 device_id_scheme = true;
399 static int video_enable_only_lcd(const struct dmi_system_id *d)
405 static int video_set_report_key_events(const struct dmi_system_id *id)
407 if (report_key_events == -1)
408 report_key_events = (uintptr_t)id->driver_data;
412 static int video_hw_changes_brightness(
413 const struct dmi_system_id *d)
415 if (hw_changes_brightness == -1)
416 hw_changes_brightness = 1;
420 static const struct dmi_system_id video_dmi_table[] = {
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
425 .callback = video_set_bqc_offset,
426 .ident = "Acer Aspire 5720",
428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5710Z",
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
441 .callback = video_set_bqc_offset,
442 .ident = "eMachines E510",
444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
449 .callback = video_set_bqc_offset,
450 .ident = "Acer Aspire 5315",
452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
457 .callback = video_set_bqc_offset,
458 .ident = "Acer Aspire 7720",
460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
466 * Some machines have a broken acpi-video interface for brightness
467 * control, but still need an acpi_video_device_lcd_set_level() call
468 * on resume to turn the backlight power on. We Enable backlight
469 * control on these systems, but do not register a backlight sysfs
470 * as brightness control does not work.
473 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
474 .callback = video_disable_backlight_sysfs_if,
475 .ident = "Toshiba Portege R700",
477 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
478 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
482 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
483 .callback = video_disable_backlight_sysfs_if,
484 .ident = "Toshiba Portege R830",
486 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
487 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
491 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
492 .callback = video_disable_backlight_sysfs_if,
493 .ident = "Toshiba Satellite R830",
495 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
500 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
501 * but the IDs actually follow the Device ID Scheme.
504 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
505 .callback = video_set_device_id_scheme,
506 .ident = "ESPRIMO Mobile M9410",
508 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
509 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
513 * Some machines have multiple video output devices, but only the one
514 * that is the type of LCD can do the backlight control so we should not
515 * register backlight interface for other video output devices.
518 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
519 .callback = video_enable_only_lcd,
520 .ident = "ESPRIMO Mobile M9410",
522 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
523 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
527 * Some machines report wrong key events on the acpi-bus, suppress
528 * key event reporting on these. Note this is only intended to work
529 * around events which are plain wrong. In some cases we get double
530 * events, in this case acpi-video is considered the canonical source
531 * and the events from the other source should be filtered. E.g.
532 * by calling acpi_video_handles_brightness_key_presses() from the
533 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
536 .callback = video_set_report_key_events,
537 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
538 .ident = "Dell Vostro V131",
540 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
541 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
545 .callback = video_set_report_key_events,
546 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
547 .ident = "Dell Vostro 3350",
549 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
550 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
554 * Some machines change the brightness themselves when a brightness
555 * hotkey gets pressed, despite us telling them not to. In this case
556 * acpi_video_device_notify() should only call backlight_force_update(
557 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
560 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
561 .callback = video_hw_changes_brightness,
562 .ident = "Packard Bell EasyNote MZ35",
564 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
565 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
571 static unsigned long long
572 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
573 unsigned long long bqc_value)
575 unsigned long long level;
577 if (device->brightness->flags._BQC_use_index) {
579 * _BQC returns an index that doesn't account for the first 2
580 * items with special meaning (see enum acpi_video_level_idx),
581 * so we need to compensate for that by offsetting ourselves
583 if (device->brightness->flags._BCL_reversed)
584 bqc_value = device->brightness->count -
585 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
587 level = device->brightness->levels[bqc_value +
588 ACPI_VIDEO_FIRST_LEVEL];
593 level += bqc_offset_aml_bug_workaround;
599 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
600 unsigned long long *level, bool raw)
602 acpi_status status = AE_OK;
605 if (device->cap._BQC || device->cap._BCQ) {
606 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
608 status = acpi_evaluate_integer(device->dev->handle, buf,
610 if (ACPI_SUCCESS(status)) {
613 * Caller has indicated he wants the raw
614 * value returned by _BQC, so don't furtherly
615 * mess with the value.
620 *level = acpi_video_bqc_value_to_level(device, *level);
622 for (i = ACPI_VIDEO_FIRST_LEVEL;
623 i < device->brightness->count; i++)
624 if (device->brightness->levels[i] == *level) {
625 device->brightness->curr = *level;
629 * BQC returned an invalid level.
632 acpi_handle_info(device->dev->handle,
633 "%s returned an invalid level", buf);
634 device->cap._BQC = device->cap._BCQ = 0;
638 * should we return an error or ignore this failure?
639 * dev->brightness->curr is a cached value which stores
640 * the correct current backlight level in most cases.
641 * ACPI video backlight still works w/ buggy _BQC.
642 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
644 acpi_handle_info(device->dev->handle,
645 "%s evaluation failed", buf);
646 device->cap._BQC = device->cap._BCQ = 0;
650 *level = device->brightness->curr;
655 acpi_video_device_EDID(struct acpi_video_device *device,
656 union acpi_object **edid, ssize_t length)
659 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
660 union acpi_object *obj;
661 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
662 struct acpi_object_list args = { 1, &arg0 };
670 arg0.integer.value = 1;
671 else if (length == 256)
672 arg0.integer.value = 2;
676 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
677 if (ACPI_FAILURE(status))
680 obj = buffer.pointer;
682 if (obj && obj->type == ACPI_TYPE_BUFFER)
685 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
697 * video : video bus device pointer
699 * 0. The system BIOS should NOT automatically switch(toggle)
700 * the active display output.
701 * 1. The system BIOS should automatically switch (toggle) the
702 * active display output. No switch event.
703 * 2. The _DGS value should be locked.
704 * 3. The system BIOS should not automatically switch (toggle) the
705 * active display output, but instead generate the display switch
708 * 0. The system BIOS should automatically control the brightness level
710 * - the power changes from AC to DC (ACPI appendix B)
711 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
712 * 1. The system BIOS should NOT automatically control the brightness
713 * level of the LCD when:
714 * - the power changes from AC to DC (ACPI appendix B)
715 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
721 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
725 if (!video->cap._DOS)
728 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
730 video->dos_setting = (lcd_flag << 2) | bios_flag;
731 status = acpi_execute_simple_method(video->device->handle, "_DOS",
732 (lcd_flag << 2) | bios_flag);
733 if (ACPI_FAILURE(status))
740 * Simple comparison function used to sort backlight levels.
744 acpi_video_cmp_level(const void *a, const void *b)
746 return *(int *)a - *(int *)b;
750 * Decides if _BQC/_BCQ for this system is usable
752 * We do this by changing the level first and then read out the current
753 * brightness level, if the value does not match, find out if it is using
754 * index. If not, clear the _BQC/_BCQ capability.
756 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
757 int max_level, int current_level)
759 struct acpi_video_device_brightness *br = device->brightness;
761 unsigned long long level;
764 /* don't mess with existing known broken systems */
765 if (bqc_offset_aml_bug_workaround)
769 * Some systems always report current brightness level as maximum
770 * through _BQC, we need to test another value for them. However,
771 * there is a subtlety:
773 * If the _BCL package ordering is descending, the first level
774 * (br->levels[2]) is likely to be 0, and if the number of levels
775 * matches the number of steps, we might confuse a returned level to
780 * current_level = max_level = 100
782 * returned level = 100
784 * In this case 100 means the level, not the index, and _BCM failed.
785 * Still, if the _BCL package ordering is descending, the index of
786 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
788 * This causes all _BQC calls to return bogus values causing weird
789 * behavior from the user's perspective. For example:
791 * xbacklight -set 10; xbacklight -set 20;
793 * would flash to 90% and then slowly down to the desired level (20).
795 * The solution is simple; test anything other than the first level
798 test_level = current_level == max_level
799 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
802 result = acpi_video_device_lcd_set_level(device, test_level);
806 result = acpi_video_device_lcd_get_level_current(device, &level, true);
810 if (level != test_level) {
811 /* buggy _BQC found, need to find out if it uses index */
812 if (level < br->count) {
813 if (br->flags._BCL_reversed)
814 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
815 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
816 br->flags._BQC_use_index = 1;
819 if (!br->flags._BQC_use_index)
820 device->cap._BQC = device->cap._BCQ = 0;
826 int acpi_video_get_levels(struct acpi_device *device,
827 struct acpi_video_device_brightness **dev_br,
830 union acpi_object *obj = NULL;
831 int i, max_level = 0, count = 0, level_ac_battery = 0;
832 union acpi_object *o;
833 struct acpi_video_device_brightness *br = NULL;
837 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
838 acpi_handle_debug(device->handle,
839 "Could not query available LCD brightness level\n");
844 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
849 br = kzalloc(sizeof(*br), GFP_KERNEL);
856 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
857 * in order to account for buggy BIOS which don't export the first two
858 * special levels (see below)
860 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
868 for (i = 0; i < obj->package.count; i++) {
869 o = (union acpi_object *)&obj->package.elements[i];
870 if (o->type != ACPI_TYPE_INTEGER) {
871 acpi_handle_info(device->handle, "Invalid data\n");
874 value = (u32) o->integer.value;
875 /* Skip duplicate entries */
876 if (count > ACPI_VIDEO_FIRST_LEVEL
877 && br->levels[count - 1] == value)
880 br->levels[count] = value;
882 if (br->levels[count] > max_level)
883 max_level = br->levels[count];
888 * some buggy BIOS don't export the levels
889 * when machine is on AC/Battery in _BCL package.
890 * In this case, the first two elements in _BCL packages
891 * are also supported brightness levels that OS should take care of.
893 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
894 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
896 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
900 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
901 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
902 br->flags._BCL_no_ac_battery_levels = 1;
903 for (i = (count - 1 + level_ac_battery);
904 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
905 br->levels[i] = br->levels[i - level_ac_battery];
906 count += level_ac_battery;
907 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
908 acpi_handle_info(device->handle,
909 "Too many duplicates in _BCL package");
911 /* Check if the _BCL package is in a reversed order */
912 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
913 br->flags._BCL_reversed = 1;
914 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
915 count - ACPI_VIDEO_FIRST_LEVEL,
916 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
917 acpi_video_cmp_level, NULL);
918 } else if (max_level != br->levels[count - 1])
919 acpi_handle_info(device->handle,
920 "Found unordered _BCL package");
925 *pmax_level = max_level;
934 EXPORT_SYMBOL(acpi_video_get_levels);
938 * device : video output device (LCD, CRT, ..)
941 * Maximum brightness level
943 * Allocate and initialize device->brightness.
947 acpi_video_init_brightness(struct acpi_video_device *device)
949 int i, max_level = 0;
950 unsigned long long level, level_old;
951 struct acpi_video_device_brightness *br = NULL;
954 result = acpi_video_get_levels(device->dev, &br, &max_level);
957 device->brightness = br;
959 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
960 br->curr = level = max_level;
962 if (!device->cap._BQC)
965 result = acpi_video_device_lcd_get_level_current(device,
968 goto out_free_levels;
970 result = acpi_video_bqc_quirk(device, max_level, level_old);
972 goto out_free_levels;
974 * cap._BQC may get cleared due to _BQC is found to be broken
975 * in acpi_video_bqc_quirk, so check again here.
977 if (!device->cap._BQC)
980 level = acpi_video_bqc_value_to_level(device, level_old);
982 * On some buggy laptops, _BQC returns an uninitialized
983 * value when invoked for the first time, i.e.
984 * level_old is invalid (no matter whether it's a level
985 * or an index). Set the backlight to max_level in this case.
987 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
988 if (level == br->levels[i])
990 if (i == br->count || !level)
994 result = acpi_video_device_lcd_set_level(device, level);
996 goto out_free_levels;
998 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
999 br->count - ACPI_VIDEO_FIRST_LEVEL);
1006 device->brightness = NULL;
1012 * device : video output device (LCD, CRT, ..)
1017 * Find out all required AML methods defined under the output
1021 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1023 if (acpi_has_method(device->dev->handle, "_ADR"))
1024 device->cap._ADR = 1;
1025 if (acpi_has_method(device->dev->handle, "_BCL"))
1026 device->cap._BCL = 1;
1027 if (acpi_has_method(device->dev->handle, "_BCM"))
1028 device->cap._BCM = 1;
1029 if (acpi_has_method(device->dev->handle, "_BQC")) {
1030 device->cap._BQC = 1;
1031 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1032 acpi_handle_info(device->dev->handle,
1033 "_BCQ is used instead of _BQC\n");
1034 device->cap._BCQ = 1;
1037 if (acpi_has_method(device->dev->handle, "_DDC"))
1038 device->cap._DDC = 1;
1043 * device : video output device (VGA)
1048 * Find out all required AML methods defined under the video bus device.
1051 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1053 if (acpi_has_method(video->device->handle, "_DOS"))
1054 video->cap._DOS = 1;
1055 if (acpi_has_method(video->device->handle, "_DOD"))
1056 video->cap._DOD = 1;
1057 if (acpi_has_method(video->device->handle, "_ROM"))
1058 video->cap._ROM = 1;
1059 if (acpi_has_method(video->device->handle, "_GPD"))
1060 video->cap._GPD = 1;
1061 if (acpi_has_method(video->device->handle, "_SPD"))
1062 video->cap._SPD = 1;
1063 if (acpi_has_method(video->device->handle, "_VPO"))
1064 video->cap._VPO = 1;
1068 * Check whether the video bus device has required AML method to
1069 * support the desired features
1072 static int acpi_video_bus_check(struct acpi_video_bus *video)
1074 acpi_status status = -ENOENT;
1075 struct pci_dev *dev;
1080 dev = acpi_get_pci_dev(video->device->handle);
1086 * Since there is no HID, CID and so on for VGA driver, we have
1087 * to check well known required nodes.
1090 /* Does this device support video switching? */
1091 if (video->cap._DOS || video->cap._DOD) {
1092 if (!video->cap._DOS) {
1093 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1094 acpi_device_bid(video->device));
1096 video->flags.multihead = 1;
1100 /* Does this device support retrieving a video ROM? */
1101 if (video->cap._ROM) {
1102 video->flags.rom = 1;
1106 /* Does this device support configuring which video device to POST? */
1107 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1108 video->flags.post = 1;
1116 * --------------------------------------------------------------------------
1118 * --------------------------------------------------------------------------
1121 /* device interface */
1122 static struct acpi_video_device_attrib *
1123 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1125 struct acpi_video_enumerated_device *ids;
1128 for (i = 0; i < video->attached_count; i++) {
1129 ids = &video->attached_array[i];
1130 if ((ids->value.int_val & 0xffff) == device_id)
1131 return &ids->value.attrib;
1138 acpi_video_get_device_type(struct acpi_video_bus *video,
1139 unsigned long device_id)
1141 struct acpi_video_enumerated_device *ids;
1144 for (i = 0; i < video->attached_count; i++) {
1145 ids = &video->attached_array[i];
1146 if ((ids->value.int_val & 0xffff) == device_id)
1147 return ids->value.int_val;
1154 acpi_video_bus_get_one_device(struct acpi_device *device,
1155 struct acpi_video_bus *video)
1157 unsigned long long device_id;
1158 int status, device_type;
1159 struct acpi_video_device *data;
1160 struct acpi_video_device_attrib *attribute;
1163 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1164 /* Some device omits _ADR, we skip them instead of fail */
1165 if (ACPI_FAILURE(status))
1168 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1172 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1173 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1174 device->driver_data = data;
1176 data->device_id = device_id;
1177 data->video = video;
1179 INIT_DELAYED_WORK(&data->switch_brightness_work,
1180 acpi_video_switch_brightness);
1182 attribute = acpi_video_get_device_attr(video, device_id);
1184 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1185 switch (attribute->display_type) {
1186 case ACPI_VIDEO_DISPLAY_CRT:
1187 data->flags.crt = 1;
1189 case ACPI_VIDEO_DISPLAY_TV:
1190 data->flags.tvout = 1;
1192 case ACPI_VIDEO_DISPLAY_DVI:
1193 data->flags.dvi = 1;
1195 case ACPI_VIDEO_DISPLAY_LCD:
1196 data->flags.lcd = 1;
1199 data->flags.unknown = 1;
1202 if (attribute->bios_can_detect)
1203 data->flags.bios = 1;
1205 /* Check for legacy IDs */
1206 device_type = acpi_video_get_device_type(video, device_id);
1207 /* Ignore bits 16 and 18-20 */
1208 switch (device_type & 0xffe2ffff) {
1209 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1210 data->flags.crt = 1;
1212 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1213 data->flags.lcd = 1;
1215 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1216 data->flags.tvout = 1;
1219 data->flags.unknown = 1;
1223 acpi_video_device_bind(video, data);
1224 acpi_video_device_find_cap(data);
1226 if (data->cap._BCM && data->cap._BCL)
1227 has_backlight = true;
1229 mutex_lock(&video->device_list_lock);
1230 list_add_tail(&data->entry, &video->video_device_list);
1231 mutex_unlock(&video->device_list_lock);
1238 * video : video bus device
1243 * Enumerate the video device list of the video bus,
1244 * bind the ids with the corresponding video devices
1245 * under the video bus.
1248 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1250 struct acpi_video_device *dev;
1252 mutex_lock(&video->device_list_lock);
1254 list_for_each_entry(dev, &video->video_device_list, entry)
1255 acpi_video_device_bind(video, dev);
1257 mutex_unlock(&video->device_list_lock);
1262 * video : video bus device
1263 * device : video output device under the video
1269 * Bind the ids with the corresponding video devices
1270 * under the video bus.
1274 acpi_video_device_bind(struct acpi_video_bus *video,
1275 struct acpi_video_device *device)
1277 struct acpi_video_enumerated_device *ids;
1280 for (i = 0; i < video->attached_count; i++) {
1281 ids = &video->attached_array[i];
1282 if (device->device_id == (ids->value.int_val & 0xffff)) {
1283 ids->bind_info = device;
1284 acpi_handle_debug(video->device->handle, "%s: %d\n",
1290 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1292 struct acpi_video_bus *video = device->video;
1296 * If we have a broken _DOD or we have more than 8 output devices
1297 * under the graphics controller node that we can't proper deal with
1298 * in the operation region code currently, no need to test.
1300 if (!video->attached_count || video->child_count > 8)
1303 for (i = 0; i < video->attached_count; i++) {
1304 if ((video->attached_array[i].value.int_val & 0xfff) ==
1305 (device->device_id & 0xfff))
1314 * video : video bus device
1319 * Call _DOD to enumerate all devices attached to display adapter
1323 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1328 struct acpi_video_enumerated_device *active_list;
1329 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1330 union acpi_object *dod = NULL;
1331 union acpi_object *obj;
1333 if (!video->cap._DOD)
1334 return AE_NOT_EXIST;
1336 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1337 if (ACPI_FAILURE(status)) {
1338 acpi_handle_info(video->device->handle,
1339 "_DOD evaluation failed: %s\n",
1340 acpi_format_exception(status));
1344 dod = buffer.pointer;
1345 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1346 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1351 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1352 dod->package.count);
1354 active_list = kcalloc(1 + dod->package.count,
1355 sizeof(struct acpi_video_enumerated_device),
1363 for (i = 0; i < dod->package.count; i++) {
1364 obj = &dod->package.elements[i];
1366 if (obj->type != ACPI_TYPE_INTEGER) {
1367 acpi_handle_info(video->device->handle,
1368 "Invalid _DOD data in element %d\n", i);
1372 active_list[count].value.int_val = obj->integer.value;
1373 active_list[count].bind_info = NULL;
1375 acpi_handle_debug(video->device->handle,
1376 "_DOD element[%d] = %d\n", i,
1377 (int)obj->integer.value);
1382 kfree(video->attached_array);
1384 video->attached_array = active_list;
1385 video->attached_count = count;
1388 kfree(buffer.pointer);
1393 acpi_video_get_next_level(struct acpi_video_device *device,
1394 u32 level_current, u32 event)
1396 int min, max, min_above, max_below, i, l, delta = 255;
1397 max = max_below = 0;
1398 min = min_above = 255;
1399 /* Find closest level to level_current */
1400 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1401 l = device->brightness->levels[i];
1402 if (abs(l - level_current) < abs(delta)) {
1403 delta = l - level_current;
1408 /* Adjust level_current to closest available level */
1409 level_current += delta;
1410 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1411 l = device->brightness->levels[i];
1416 if (l < min_above && l > level_current)
1418 if (l > max_below && l < level_current)
1423 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1424 return (level_current < max) ? min_above : min;
1425 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1426 return (level_current < max) ? min_above : max;
1427 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1428 return (level_current > min) ? max_below : min;
1429 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1430 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1433 return level_current;
1438 acpi_video_switch_brightness(struct work_struct *work)
1440 struct acpi_video_device *device = container_of(to_delayed_work(work),
1441 struct acpi_video_device, switch_brightness_work);
1442 unsigned long long level_current, level_next;
1443 int event = device->switch_brightness_event;
1444 int result = -EINVAL;
1446 /* no warning message if acpi_backlight=vendor or a quirk is used */
1447 if (!device->backlight)
1450 if (!device->brightness)
1453 result = acpi_video_device_lcd_get_level_current(device,
1459 level_next = acpi_video_get_next_level(device, level_current, event);
1461 result = acpi_video_device_lcd_set_level(device, level_next);
1464 backlight_force_update(device->backlight,
1465 BACKLIGHT_UPDATE_HOTKEY);
1469 acpi_handle_info(device->dev->handle,
1470 "Failed to switch brightness\n");
1473 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1476 struct acpi_video_bus *video;
1477 struct acpi_video_device *video_device;
1478 union acpi_object *buffer = NULL;
1482 if (!device || !acpi_driver_data(device))
1485 video = acpi_driver_data(device);
1487 for (i = 0; i < video->attached_count; i++) {
1488 video_device = video->attached_array[i].bind_info;
1494 if (!video_device->cap._DDC)
1499 case ACPI_VIDEO_DISPLAY_CRT:
1500 if (!video_device->flags.crt)
1503 case ACPI_VIDEO_DISPLAY_TV:
1504 if (!video_device->flags.tvout)
1507 case ACPI_VIDEO_DISPLAY_DVI:
1508 if (!video_device->flags.dvi)
1511 case ACPI_VIDEO_DISPLAY_LCD:
1512 if (!video_device->flags.lcd)
1516 } else if (video_device->device_id != device_id) {
1520 status = acpi_video_device_EDID(video_device, &buffer, length);
1522 if (ACPI_FAILURE(status) || !buffer ||
1523 buffer->type != ACPI_TYPE_BUFFER) {
1525 status = acpi_video_device_EDID(video_device, &buffer,
1527 if (ACPI_FAILURE(status) || !buffer ||
1528 buffer->type != ACPI_TYPE_BUFFER) {
1533 *edid = buffer->buffer.pointer;
1539 EXPORT_SYMBOL(acpi_video_get_edid);
1542 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1543 struct acpi_device *device)
1546 struct acpi_device *dev;
1549 * There are systems where video module known to work fine regardless
1550 * of broken _DOD and ignoring returned value here doesn't cause
1553 acpi_video_device_enumerate(video);
1555 list_for_each_entry(dev, &device->children, node) {
1557 status = acpi_video_bus_get_one_device(dev, video);
1559 dev_err(&dev->dev, "Can't attach device\n");
1562 video->child_count++;
1567 /* acpi_video interface */
1570 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1571 * perform any automatic brightness change on receiving a notification.
1573 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1575 return acpi_video_bus_DOS(video, 0,
1576 acpi_osi_is_win8() ? 1 : 0);
1579 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1581 return acpi_video_bus_DOS(video, 0,
1582 acpi_osi_is_win8() ? 0 : 1);
1585 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1587 struct acpi_video_bus *video = acpi_driver_data(device);
1588 struct input_dev *input;
1591 if (!video || !video->input)
1594 input = video->input;
1597 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1598 * most likely via hotkey. */
1599 keycode = KEY_SWITCHVIDEOMODE;
1602 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1604 acpi_video_device_enumerate(video);
1605 acpi_video_device_rebind(video);
1606 keycode = KEY_SWITCHVIDEOMODE;
1609 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1610 keycode = KEY_SWITCHVIDEOMODE;
1612 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1613 keycode = KEY_VIDEO_NEXT;
1615 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1616 keycode = KEY_VIDEO_PREV;
1620 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1625 if (acpi_notifier_call_chain(device, event, 0))
1626 /* Something vetoed the keypress. */
1629 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1630 input_report_key(input, keycode, 1);
1632 input_report_key(input, keycode, 0);
1637 static void brightness_switch_event(struct acpi_video_device *video_device,
1640 if (!brightness_switch_enabled)
1643 video_device->switch_brightness_event = event;
1644 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1647 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1649 struct acpi_video_device *video_device = data;
1650 struct acpi_device *device = NULL;
1651 struct acpi_video_bus *bus;
1652 struct input_dev *input;
1658 device = video_device->dev;
1659 bus = video_device->video;
1662 if (hw_changes_brightness > 0) {
1663 if (video_device->backlight)
1664 backlight_force_update(video_device->backlight,
1665 BACKLIGHT_UPDATE_HOTKEY);
1666 acpi_notifier_call_chain(device, event, 0);
1671 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1672 brightness_switch_event(video_device, event);
1673 keycode = KEY_BRIGHTNESS_CYCLE;
1675 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1676 brightness_switch_event(video_device, event);
1677 keycode = KEY_BRIGHTNESSUP;
1679 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1680 brightness_switch_event(video_device, event);
1681 keycode = KEY_BRIGHTNESSDOWN;
1683 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1684 brightness_switch_event(video_device, event);
1685 keycode = KEY_BRIGHTNESS_ZERO;
1687 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1688 brightness_switch_event(video_device, event);
1689 keycode = KEY_DISPLAY_OFF;
1692 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1696 acpi_notifier_call_chain(device, event, 0);
1698 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1699 input_report_key(input, keycode, 1);
1701 input_report_key(input, keycode, 0);
1706 static int acpi_video_resume(struct notifier_block *nb,
1707 unsigned long val, void *ign)
1709 struct acpi_video_bus *video;
1710 struct acpi_video_device *video_device;
1714 case PM_POST_HIBERNATION:
1715 case PM_POST_SUSPEND:
1716 case PM_POST_RESTORE:
1717 video = container_of(nb, struct acpi_video_bus, pm_nb);
1719 dev_info(&video->device->dev, "Restoring backlight state\n");
1721 for (i = 0; i < video->attached_count; i++) {
1722 video_device = video->attached_array[i].bind_info;
1723 if (video_device && video_device->brightness)
1724 acpi_video_device_lcd_set_level(video_device,
1725 video_device->brightness->curr);
1734 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1735 void **return_value)
1737 struct acpi_device *device = context;
1738 struct acpi_device *sibling;
1740 if (handle == device->handle)
1741 return AE_CTRL_TERMINATE;
1743 sibling = acpi_fetch_acpi_dev(handle);
1747 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1748 return AE_ALREADY_EXISTS;
1753 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1755 struct backlight_properties props;
1756 struct pci_dev *pdev;
1757 acpi_handle acpi_parent;
1758 struct device *parent = NULL;
1763 result = acpi_video_init_brightness(device);
1767 if (disable_backlight_sysfs_if > 0)
1770 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1775 acpi_get_parent(device->dev->handle, &acpi_parent);
1777 pdev = acpi_get_pci_dev(acpi_parent);
1779 parent = &pdev->dev;
1783 memset(&props, 0, sizeof(struct backlight_properties));
1784 props.type = BACKLIGHT_FIRMWARE;
1785 props.max_brightness =
1786 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1787 device->backlight = backlight_device_register(name,
1790 &acpi_backlight_ops,
1793 if (IS_ERR(device->backlight)) {
1794 device->backlight = NULL;
1799 * Save current brightness level in case we have to restore it
1800 * before acpi_video_device_lcd_set_level() is called next time.
1802 device->backlight->props.brightness =
1803 acpi_video_get_brightness(device->backlight);
1805 device->cooling_dev = thermal_cooling_device_register("LCD",
1806 device->dev, &video_cooling_ops);
1807 if (IS_ERR(device->cooling_dev)) {
1809 * Set cooling_dev to NULL so we don't crash trying to free it.
1810 * Also, why the hell we are returning early and not attempt to
1811 * register video output if cooling device registration failed?
1814 device->cooling_dev = NULL;
1818 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1819 device->cooling_dev->id);
1820 result = sysfs_create_link(&device->dev->dev.kobj,
1821 &device->cooling_dev->device.kobj,
1824 pr_info("sysfs link creation failed\n");
1826 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1827 &device->dev->dev.kobj, "device");
1829 pr_info("Reverse sysfs link creation failed\n");
1832 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1834 struct acpi_video_device *dev;
1835 union acpi_object *levels;
1837 mutex_lock(&video->device_list_lock);
1838 list_for_each_entry(dev, &video->video_device_list, entry) {
1839 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1842 mutex_unlock(&video->device_list_lock);
1845 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1848 * Do not create backlight device for video output
1849 * device that is not in the enumerated list.
1851 if (!acpi_video_device_in_dod(dev)) {
1852 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1857 return dev->flags.lcd;
1861 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1863 struct acpi_video_device *dev;
1865 if (video->backlight_registered)
1868 acpi_video_run_bcl_for_osi(video);
1870 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1873 mutex_lock(&video->device_list_lock);
1874 list_for_each_entry(dev, &video->video_device_list, entry) {
1875 if (acpi_video_should_register_backlight(dev))
1876 acpi_video_dev_register_backlight(dev);
1878 mutex_unlock(&video->device_list_lock);
1880 video->backlight_registered = true;
1882 video->pm_nb.notifier_call = acpi_video_resume;
1883 video->pm_nb.priority = 0;
1884 return register_pm_notifier(&video->pm_nb);
1887 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1889 if (device->backlight) {
1890 backlight_device_unregister(device->backlight);
1891 device->backlight = NULL;
1893 if (device->brightness) {
1894 kfree(device->brightness->levels);
1895 kfree(device->brightness);
1896 device->brightness = NULL;
1898 if (device->cooling_dev) {
1899 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1900 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1901 thermal_cooling_device_unregister(device->cooling_dev);
1902 device->cooling_dev = NULL;
1906 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1908 struct acpi_video_device *dev;
1911 if (!video->backlight_registered)
1914 error = unregister_pm_notifier(&video->pm_nb);
1916 mutex_lock(&video->device_list_lock);
1917 list_for_each_entry(dev, &video->video_device_list, entry)
1918 acpi_video_dev_unregister_backlight(dev);
1919 mutex_unlock(&video->device_list_lock);
1921 video->backlight_registered = false;
1926 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1929 struct acpi_device *adev = device->dev;
1931 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1932 acpi_video_device_notify, device);
1933 if (ACPI_FAILURE(status))
1934 dev_err(&adev->dev, "Error installing notify handler\n");
1936 device->flags.notify = 1;
1939 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1941 struct input_dev *input;
1942 struct acpi_video_device *dev;
1945 video->input = input = input_allocate_device();
1951 error = acpi_video_bus_start_devices(video);
1953 goto err_free_input;
1955 snprintf(video->phys, sizeof(video->phys),
1956 "%s/video/input0", acpi_device_hid(video->device));
1958 input->name = acpi_device_name(video->device);
1959 input->phys = video->phys;
1960 input->id.bustype = BUS_HOST;
1961 input->id.product = 0x06;
1962 input->dev.parent = &video->device->dev;
1963 input->evbit[0] = BIT(EV_KEY);
1964 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1965 set_bit(KEY_VIDEO_NEXT, input->keybit);
1966 set_bit(KEY_VIDEO_PREV, input->keybit);
1967 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1968 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1969 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1970 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1971 set_bit(KEY_DISPLAY_OFF, input->keybit);
1973 error = input_register_device(input);
1977 mutex_lock(&video->device_list_lock);
1978 list_for_each_entry(dev, &video->video_device_list, entry)
1979 acpi_video_dev_add_notify_handler(dev);
1980 mutex_unlock(&video->device_list_lock);
1985 acpi_video_bus_stop_devices(video);
1987 input_free_device(input);
1988 video->input = NULL;
1993 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1995 if (dev->flags.notify) {
1996 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1997 acpi_video_device_notify);
1998 dev->flags.notify = 0;
2002 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2004 struct acpi_video_device *dev;
2006 mutex_lock(&video->device_list_lock);
2007 list_for_each_entry(dev, &video->video_device_list, entry)
2008 acpi_video_dev_remove_notify_handler(dev);
2009 mutex_unlock(&video->device_list_lock);
2011 acpi_video_bus_stop_devices(video);
2012 input_unregister_device(video->input);
2013 video->input = NULL;
2016 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2018 struct acpi_video_device *dev, *next;
2020 mutex_lock(&video->device_list_lock);
2021 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2022 list_del(&dev->entry);
2025 mutex_unlock(&video->device_list_lock);
2030 static int instance;
2032 static int acpi_video_bus_add(struct acpi_device *device)
2034 struct acpi_video_bus *video;
2038 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2039 device->parent->handle, 1,
2040 acpi_video_bus_match, NULL,
2042 if (status == AE_ALREADY_EXISTS) {
2044 "Duplicate ACPI video bus devices for the"
2045 " same VGA controller, please try module "
2046 "parameter \"video.allow_duplicates=1\""
2047 "if the current driver doesn't work.\n");
2048 if (!allow_duplicates)
2052 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2056 /* a hack to fix the duplicate name "VID" problem on T61 */
2057 if (!strcmp(device->pnp.bus_id, "VID")) {
2059 device->pnp.bus_id[3] = '0' + instance;
2062 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2063 if (!strcmp(device->pnp.bus_id, "VGA")) {
2065 device->pnp.bus_id[3] = '0' + instance;
2069 video->device = device;
2070 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2071 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2072 device->driver_data = video;
2074 acpi_video_bus_find_cap(video);
2075 error = acpi_video_bus_check(video);
2077 goto err_free_video;
2079 mutex_init(&video->device_list_lock);
2080 INIT_LIST_HEAD(&video->video_device_list);
2082 error = acpi_video_bus_get_devices(video, device);
2086 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2087 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2088 video->flags.multihead ? "yes" : "no",
2089 video->flags.rom ? "yes" : "no",
2090 video->flags.post ? "yes" : "no");
2091 mutex_lock(&video_list_lock);
2092 list_add_tail(&video->entry, &video_bus_head);
2093 mutex_unlock(&video_list_lock);
2095 acpi_video_bus_register_backlight(video);
2096 acpi_video_bus_add_notify_handler(video);
2101 acpi_video_bus_put_devices(video);
2102 kfree(video->attached_array);
2105 device->driver_data = NULL;
2110 static int acpi_video_bus_remove(struct acpi_device *device)
2112 struct acpi_video_bus *video = NULL;
2115 if (!device || !acpi_driver_data(device))
2118 video = acpi_driver_data(device);
2120 acpi_video_bus_remove_notify_handler(video);
2121 acpi_video_bus_unregister_backlight(video);
2122 acpi_video_bus_put_devices(video);
2124 mutex_lock(&video_list_lock);
2125 list_del(&video->entry);
2126 mutex_unlock(&video_list_lock);
2128 kfree(video->attached_array);
2134 static int __init is_i740(struct pci_dev *dev)
2136 if (dev->device == 0x00D1)
2138 if (dev->device == 0x7000)
2143 static int __init intel_opregion_present(void)
2146 struct pci_dev *dev = NULL;
2149 for_each_pci_dev(dev) {
2150 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2152 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2154 /* We don't want to poke around undefined i740 registers */
2157 pci_read_config_dword(dev, 0xfc, &address);
2165 /* Check if the chassis-type indicates there is no builtin LCD panel */
2166 static bool dmi_is_desktop(void)
2168 const char *chassis_type;
2171 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2175 if (kstrtoul(chassis_type, 10, &type) != 0)
2179 case 0x03: /* Desktop */
2180 case 0x04: /* Low Profile Desktop */
2181 case 0x05: /* Pizza Box */
2182 case 0x06: /* Mini Tower */
2183 case 0x07: /* Tower */
2184 case 0x10: /* Lunch Box */
2185 case 0x11: /* Main Server Chassis */
2193 * We're seeing a lot of bogus backlight interfaces on newer machines
2194 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2195 * lcd flag fixes this, enable this by default on any machines which are:
2196 * 1. Win8 ready (where we also prefer the native backlight driver, so
2197 * normally the acpi_video code should not register there anyways); *and*
2198 * 2.1 Report a desktop/server DMI chassis-type, or
2199 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2202 static bool should_check_lcd_flag(void)
2204 if (!acpi_osi_is_win8())
2207 if (dmi_is_desktop())
2210 if (acpi_reduced_hardware())
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 only_lcd = should_check_lcd_flag();
2232 dmi_check_system(video_dmi_table);
2234 ret = acpi_bus_register_driver(&acpi_video_bus);
2239 * When the acpi_video_bus is loaded successfully, increase
2240 * the counter reference.
2245 mutex_unlock(®ister_count_mutex);
2248 EXPORT_SYMBOL(acpi_video_register);
2250 void acpi_video_unregister(void)
2252 mutex_lock(®ister_count_mutex);
2253 if (register_count) {
2254 acpi_bus_unregister_driver(&acpi_video_bus);
2256 has_backlight = false;
2258 mutex_unlock(®ister_count_mutex);
2260 EXPORT_SYMBOL(acpi_video_unregister);
2262 void acpi_video_unregister_backlight(void)
2264 struct acpi_video_bus *video;
2266 mutex_lock(®ister_count_mutex);
2267 if (register_count) {
2268 mutex_lock(&video_list_lock);
2269 list_for_each_entry(video, &video_bus_head, entry)
2270 acpi_video_bus_unregister_backlight(video);
2271 mutex_unlock(&video_list_lock);
2273 mutex_unlock(®ister_count_mutex);
2276 bool acpi_video_handles_brightness_key_presses(void)
2278 return has_backlight &&
2279 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2281 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2284 * This is kind of nasty. Hardware using Intel chipsets may require
2285 * the video opregion code to be run first in order to initialise
2286 * state before any ACPI video calls are made. To handle this we defer
2287 * registration of the video class until the opregion code has run.
2290 static int __init acpi_video_init(void)
2293 * Let the module load even if ACPI is disabled (e.g. due to
2294 * a broken BIOS) so that i915.ko can still be loaded on such
2295 * old systems without an AcpiOpRegion.
2297 * acpi_video_register() will report -ENODEV later as well due
2298 * to acpi_disabled when i915.ko tries to register itself afterwards.
2303 if (intel_opregion_present())
2306 return acpi_video_register();
2309 static void __exit acpi_video_exit(void)
2311 acpi_video_detect_exit();
2312 acpi_video_unregister();
2315 module_init(acpi_video_init);
2316 module_exit(acpi_video_exit);