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 may_report_brightness_keys;
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 .callback = video_disable_backlight_sysfs_if,
501 .ident = "Toshiba Satellite Z830",
503 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"),
508 .callback = video_disable_backlight_sysfs_if,
509 .ident = "Toshiba Portege Z830",
511 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
512 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"),
516 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
517 * but the IDs actually follow the Device ID Scheme.
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
521 .callback = video_set_device_id_scheme,
522 .ident = "ESPRIMO Mobile M9410",
524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
529 * Some machines have multiple video output devices, but only the one
530 * that is the type of LCD can do the backlight control so we should not
531 * register backlight interface for other video output devices.
534 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
535 .callback = video_enable_only_lcd,
536 .ident = "ESPRIMO Mobile M9410",
538 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
539 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
543 * Some machines report wrong key events on the acpi-bus, suppress
544 * key event reporting on these. Note this is only intended to work
545 * around events which are plain wrong. In some cases we get double
546 * events, in this case acpi-video is considered the canonical source
547 * and the events from the other source should be filtered. E.g.
548 * by calling acpi_video_handles_brightness_key_presses() from the
549 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
552 .callback = video_set_report_key_events,
553 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
554 .ident = "Dell Vostro V131",
556 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
557 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
561 .callback = video_set_report_key_events,
562 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
563 .ident = "Dell Vostro 3350",
565 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
566 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
570 * Some machines change the brightness themselves when a brightness
571 * hotkey gets pressed, despite us telling them not to. In this case
572 * acpi_video_device_notify() should only call backlight_force_update(
573 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
576 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
577 .callback = video_hw_changes_brightness,
578 .ident = "Packard Bell EasyNote MZ35",
580 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
587 static unsigned long long
588 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
589 unsigned long long bqc_value)
591 unsigned long long level;
593 if (device->brightness->flags._BQC_use_index) {
595 * _BQC returns an index that doesn't account for the first 2
596 * items with special meaning (see enum acpi_video_level_idx),
597 * so we need to compensate for that by offsetting ourselves
599 if (device->brightness->flags._BCL_reversed)
600 bqc_value = device->brightness->count -
601 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
603 level = device->brightness->levels[bqc_value +
604 ACPI_VIDEO_FIRST_LEVEL];
609 level += bqc_offset_aml_bug_workaround;
615 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
616 unsigned long long *level, bool raw)
618 acpi_status status = AE_OK;
621 if (device->cap._BQC || device->cap._BCQ) {
622 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
624 status = acpi_evaluate_integer(device->dev->handle, buf,
626 if (ACPI_SUCCESS(status)) {
629 * Caller has indicated he wants the raw
630 * value returned by _BQC, so don't furtherly
631 * mess with the value.
636 *level = acpi_video_bqc_value_to_level(device, *level);
638 for (i = ACPI_VIDEO_FIRST_LEVEL;
639 i < device->brightness->count; i++)
640 if (device->brightness->levels[i] == *level) {
641 device->brightness->curr = *level;
645 * BQC returned an invalid level.
648 acpi_handle_info(device->dev->handle,
649 "%s returned an invalid level", buf);
650 device->cap._BQC = device->cap._BCQ = 0;
654 * should we return an error or ignore this failure?
655 * dev->brightness->curr is a cached value which stores
656 * the correct current backlight level in most cases.
657 * ACPI video backlight still works w/ buggy _BQC.
658 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
660 acpi_handle_info(device->dev->handle,
661 "%s evaluation failed", buf);
662 device->cap._BQC = device->cap._BCQ = 0;
666 *level = device->brightness->curr;
671 acpi_video_device_EDID(struct acpi_video_device *device,
672 union acpi_object **edid, ssize_t length)
675 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
676 union acpi_object *obj;
677 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
678 struct acpi_object_list args = { 1, &arg0 };
686 arg0.integer.value = 1;
687 else if (length == 256)
688 arg0.integer.value = 2;
692 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
693 if (ACPI_FAILURE(status))
696 obj = buffer.pointer;
698 if (obj && obj->type == ACPI_TYPE_BUFFER)
701 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
713 * video : video bus device pointer
715 * 0. The system BIOS should NOT automatically switch(toggle)
716 * the active display output.
717 * 1. The system BIOS should automatically switch (toggle) the
718 * active display output. No switch event.
719 * 2. The _DGS value should be locked.
720 * 3. The system BIOS should not automatically switch (toggle) the
721 * active display output, but instead generate the display switch
724 * 0. The system BIOS should automatically control the brightness level
726 * - the power changes from AC to DC (ACPI appendix B)
727 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
728 * 1. The system BIOS should NOT automatically control the brightness
729 * level of the LCD when:
730 * - the power changes from AC to DC (ACPI appendix B)
731 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
737 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
741 if (!video->cap._DOS)
744 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
746 video->dos_setting = (lcd_flag << 2) | bios_flag;
747 status = acpi_execute_simple_method(video->device->handle, "_DOS",
748 (lcd_flag << 2) | bios_flag);
749 if (ACPI_FAILURE(status))
756 * Simple comparison function used to sort backlight levels.
760 acpi_video_cmp_level(const void *a, const void *b)
762 return *(int *)a - *(int *)b;
766 * Decides if _BQC/_BCQ for this system is usable
768 * We do this by changing the level first and then read out the current
769 * brightness level, if the value does not match, find out if it is using
770 * index. If not, clear the _BQC/_BCQ capability.
772 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
773 int max_level, int current_level)
775 struct acpi_video_device_brightness *br = device->brightness;
777 unsigned long long level;
780 /* don't mess with existing known broken systems */
781 if (bqc_offset_aml_bug_workaround)
785 * Some systems always report current brightness level as maximum
786 * through _BQC, we need to test another value for them. However,
787 * there is a subtlety:
789 * If the _BCL package ordering is descending, the first level
790 * (br->levels[2]) is likely to be 0, and if the number of levels
791 * matches the number of steps, we might confuse a returned level to
796 * current_level = max_level = 100
798 * returned level = 100
800 * In this case 100 means the level, not the index, and _BCM failed.
801 * Still, if the _BCL package ordering is descending, the index of
802 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
804 * This causes all _BQC calls to return bogus values causing weird
805 * behavior from the user's perspective. For example:
807 * xbacklight -set 10; xbacklight -set 20;
809 * would flash to 90% and then slowly down to the desired level (20).
811 * The solution is simple; test anything other than the first level
814 test_level = current_level == max_level
815 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
818 result = acpi_video_device_lcd_set_level(device, test_level);
822 result = acpi_video_device_lcd_get_level_current(device, &level, true);
826 if (level != test_level) {
827 /* buggy _BQC found, need to find out if it uses index */
828 if (level < br->count) {
829 if (br->flags._BCL_reversed)
830 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
831 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
832 br->flags._BQC_use_index = 1;
835 if (!br->flags._BQC_use_index)
836 device->cap._BQC = device->cap._BCQ = 0;
842 int acpi_video_get_levels(struct acpi_device *device,
843 struct acpi_video_device_brightness **dev_br,
846 union acpi_object *obj = NULL;
847 int i, max_level = 0, count = 0, level_ac_battery = 0;
848 union acpi_object *o;
849 struct acpi_video_device_brightness *br = NULL;
853 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
854 acpi_handle_debug(device->handle,
855 "Could not query available LCD brightness level\n");
860 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
865 br = kzalloc(sizeof(*br), GFP_KERNEL);
872 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
873 * in order to account for buggy BIOS which don't export the first two
874 * special levels (see below)
876 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
884 for (i = 0; i < obj->package.count; i++) {
885 o = (union acpi_object *)&obj->package.elements[i];
886 if (o->type != ACPI_TYPE_INTEGER) {
887 acpi_handle_info(device->handle, "Invalid data\n");
890 value = (u32) o->integer.value;
891 /* Skip duplicate entries */
892 if (count > ACPI_VIDEO_FIRST_LEVEL
893 && br->levels[count - 1] == value)
896 br->levels[count] = value;
898 if (br->levels[count] > max_level)
899 max_level = br->levels[count];
904 * some buggy BIOS don't export the levels
905 * when machine is on AC/Battery in _BCL package.
906 * In this case, the first two elements in _BCL packages
907 * are also supported brightness levels that OS should take care of.
909 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
910 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
912 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
916 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
917 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
918 br->flags._BCL_no_ac_battery_levels = 1;
919 for (i = (count - 1 + level_ac_battery);
920 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
921 br->levels[i] = br->levels[i - level_ac_battery];
922 count += level_ac_battery;
923 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
924 acpi_handle_info(device->handle,
925 "Too many duplicates in _BCL package");
927 /* Check if the _BCL package is in a reversed order */
928 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
929 br->flags._BCL_reversed = 1;
930 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
931 count - ACPI_VIDEO_FIRST_LEVEL,
932 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
933 acpi_video_cmp_level, NULL);
934 } else if (max_level != br->levels[count - 1])
935 acpi_handle_info(device->handle,
936 "Found unordered _BCL package");
941 *pmax_level = max_level;
950 EXPORT_SYMBOL(acpi_video_get_levels);
954 * device : video output device (LCD, CRT, ..)
957 * Maximum brightness level
959 * Allocate and initialize device->brightness.
963 acpi_video_init_brightness(struct acpi_video_device *device)
965 int i, max_level = 0;
966 unsigned long long level, level_old;
967 struct acpi_video_device_brightness *br = NULL;
970 result = acpi_video_get_levels(device->dev, &br, &max_level);
973 device->brightness = br;
975 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
976 br->curr = level = max_level;
978 if (!device->cap._BQC)
981 result = acpi_video_device_lcd_get_level_current(device,
984 goto out_free_levels;
986 result = acpi_video_bqc_quirk(device, max_level, level_old);
988 goto out_free_levels;
990 * cap._BQC may get cleared due to _BQC is found to be broken
991 * in acpi_video_bqc_quirk, so check again here.
993 if (!device->cap._BQC)
996 level = acpi_video_bqc_value_to_level(device, level_old);
998 * On some buggy laptops, _BQC returns an uninitialized
999 * value when invoked for the first time, i.e.
1000 * level_old is invalid (no matter whether it's a level
1001 * or an index). Set the backlight to max_level in this case.
1003 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
1004 if (level == br->levels[i])
1006 if (i == br->count || !level)
1010 result = acpi_video_device_lcd_set_level(device, level);
1012 goto out_free_levels;
1014 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
1015 br->count - ACPI_VIDEO_FIRST_LEVEL);
1022 device->brightness = NULL;
1028 * device : video output device (LCD, CRT, ..)
1033 * Find out all required AML methods defined under the output
1037 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1039 if (acpi_has_method(device->dev->handle, "_ADR"))
1040 device->cap._ADR = 1;
1041 if (acpi_has_method(device->dev->handle, "_BCL"))
1042 device->cap._BCL = 1;
1043 if (acpi_has_method(device->dev->handle, "_BCM"))
1044 device->cap._BCM = 1;
1045 if (acpi_has_method(device->dev->handle, "_BQC")) {
1046 device->cap._BQC = 1;
1047 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1048 acpi_handle_info(device->dev->handle,
1049 "_BCQ is used instead of _BQC\n");
1050 device->cap._BCQ = 1;
1053 if (acpi_has_method(device->dev->handle, "_DDC"))
1054 device->cap._DDC = 1;
1059 * device : video output device (VGA)
1064 * Find out all required AML methods defined under the video bus device.
1067 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1069 if (acpi_has_method(video->device->handle, "_DOS"))
1070 video->cap._DOS = 1;
1071 if (acpi_has_method(video->device->handle, "_DOD"))
1072 video->cap._DOD = 1;
1073 if (acpi_has_method(video->device->handle, "_ROM"))
1074 video->cap._ROM = 1;
1075 if (acpi_has_method(video->device->handle, "_GPD"))
1076 video->cap._GPD = 1;
1077 if (acpi_has_method(video->device->handle, "_SPD"))
1078 video->cap._SPD = 1;
1079 if (acpi_has_method(video->device->handle, "_VPO"))
1080 video->cap._VPO = 1;
1084 * Check whether the video bus device has required AML method to
1085 * support the desired features
1088 static int acpi_video_bus_check(struct acpi_video_bus *video)
1090 acpi_status status = -ENOENT;
1091 struct pci_dev *dev;
1096 dev = acpi_get_pci_dev(video->device->handle);
1102 * Since there is no HID, CID and so on for VGA driver, we have
1103 * to check well known required nodes.
1106 /* Does this device support video switching? */
1107 if (video->cap._DOS || video->cap._DOD) {
1108 if (!video->cap._DOS) {
1109 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1110 acpi_device_bid(video->device));
1112 video->flags.multihead = 1;
1116 /* Does this device support retrieving a video ROM? */
1117 if (video->cap._ROM) {
1118 video->flags.rom = 1;
1122 /* Does this device support configuring which video device to POST? */
1123 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1124 video->flags.post = 1;
1132 * --------------------------------------------------------------------------
1134 * --------------------------------------------------------------------------
1137 /* device interface */
1138 static struct acpi_video_device_attrib *
1139 acpi_video_get_device_attr(struct acpi_video_bus *video, 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.attrib;
1154 acpi_video_get_device_type(struct acpi_video_bus *video,
1155 unsigned long device_id)
1157 struct acpi_video_enumerated_device *ids;
1160 for (i = 0; i < video->attached_count; i++) {
1161 ids = &video->attached_array[i];
1162 if ((ids->value.int_val & 0xffff) == device_id)
1163 return ids->value.int_val;
1169 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
1171 struct acpi_video_bus *video = arg;
1172 struct acpi_video_device_attrib *attribute;
1173 struct acpi_video_device *data;
1174 unsigned long long device_id;
1178 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1179 /* Skip devices without _ADR instead of failing. */
1180 if (ACPI_FAILURE(status))
1183 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1185 dev_dbg(&device->dev, "Cannot attach\n");
1189 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1190 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1191 device->driver_data = data;
1193 data->device_id = device_id;
1194 data->video = video;
1196 INIT_DELAYED_WORK(&data->switch_brightness_work,
1197 acpi_video_switch_brightness);
1199 attribute = acpi_video_get_device_attr(video, device_id);
1201 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1202 switch (attribute->display_type) {
1203 case ACPI_VIDEO_DISPLAY_CRT:
1204 data->flags.crt = 1;
1206 case ACPI_VIDEO_DISPLAY_TV:
1207 data->flags.tvout = 1;
1209 case ACPI_VIDEO_DISPLAY_DVI:
1210 data->flags.dvi = 1;
1212 case ACPI_VIDEO_DISPLAY_LCD:
1213 data->flags.lcd = 1;
1216 data->flags.unknown = 1;
1219 if (attribute->bios_can_detect)
1220 data->flags.bios = 1;
1222 /* Check for legacy IDs */
1223 device_type = acpi_video_get_device_type(video, device_id);
1224 /* Ignore bits 16 and 18-20 */
1225 switch (device_type & 0xffe2ffff) {
1226 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1227 data->flags.crt = 1;
1229 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1230 data->flags.lcd = 1;
1232 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1233 data->flags.tvout = 1;
1236 data->flags.unknown = 1;
1240 acpi_video_device_bind(video, data);
1241 acpi_video_device_find_cap(data);
1243 if (data->cap._BCM && data->cap._BCL)
1244 may_report_brightness_keys = true;
1246 mutex_lock(&video->device_list_lock);
1247 list_add_tail(&data->entry, &video->video_device_list);
1248 mutex_unlock(&video->device_list_lock);
1251 video->child_count++;
1257 * video : video bus device
1262 * Enumerate the video device list of the video bus,
1263 * bind the ids with the corresponding video devices
1264 * under the video bus.
1267 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1269 struct acpi_video_device *dev;
1271 mutex_lock(&video->device_list_lock);
1273 list_for_each_entry(dev, &video->video_device_list, entry)
1274 acpi_video_device_bind(video, dev);
1276 mutex_unlock(&video->device_list_lock);
1281 * video : video bus device
1282 * device : video output device under the video
1288 * Bind the ids with the corresponding video devices
1289 * under the video bus.
1293 acpi_video_device_bind(struct acpi_video_bus *video,
1294 struct acpi_video_device *device)
1296 struct acpi_video_enumerated_device *ids;
1299 for (i = 0; i < video->attached_count; i++) {
1300 ids = &video->attached_array[i];
1301 if (device->device_id == (ids->value.int_val & 0xffff)) {
1302 ids->bind_info = device;
1303 acpi_handle_debug(video->device->handle, "%s: %d\n",
1309 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1311 struct acpi_video_bus *video = device->video;
1315 * If we have a broken _DOD or we have more than 8 output devices
1316 * under the graphics controller node that we can't proper deal with
1317 * in the operation region code currently, no need to test.
1319 if (!video->attached_count || video->child_count > 8)
1322 for (i = 0; i < video->attached_count; i++) {
1323 if ((video->attached_array[i].value.int_val & 0xfff) ==
1324 (device->device_id & 0xfff))
1333 * video : video bus device
1338 * Call _DOD to enumerate all devices attached to display adapter
1342 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1347 struct acpi_video_enumerated_device *active_list;
1348 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1349 union acpi_object *dod = NULL;
1350 union acpi_object *obj;
1352 if (!video->cap._DOD)
1353 return AE_NOT_EXIST;
1355 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1356 if (ACPI_FAILURE(status)) {
1357 acpi_handle_info(video->device->handle,
1358 "_DOD evaluation failed: %s\n",
1359 acpi_format_exception(status));
1363 dod = buffer.pointer;
1364 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1365 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1370 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1371 dod->package.count);
1373 active_list = kcalloc(1 + dod->package.count,
1374 sizeof(struct acpi_video_enumerated_device),
1382 for (i = 0; i < dod->package.count; i++) {
1383 obj = &dod->package.elements[i];
1385 if (obj->type != ACPI_TYPE_INTEGER) {
1386 acpi_handle_info(video->device->handle,
1387 "Invalid _DOD data in element %d\n", i);
1391 active_list[count].value.int_val = obj->integer.value;
1392 active_list[count].bind_info = NULL;
1394 acpi_handle_debug(video->device->handle,
1395 "_DOD element[%d] = %d\n", i,
1396 (int)obj->integer.value);
1401 kfree(video->attached_array);
1403 video->attached_array = active_list;
1404 video->attached_count = count;
1407 kfree(buffer.pointer);
1412 acpi_video_get_next_level(struct acpi_video_device *device,
1413 u32 level_current, u32 event)
1415 int min, max, min_above, max_below, i, l, delta = 255;
1416 max = max_below = 0;
1417 min = min_above = 255;
1418 /* Find closest level to level_current */
1419 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1420 l = device->brightness->levels[i];
1421 if (abs(l - level_current) < abs(delta)) {
1422 delta = l - level_current;
1427 /* Adjust level_current to closest available level */
1428 level_current += delta;
1429 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1430 l = device->brightness->levels[i];
1435 if (l < min_above && l > level_current)
1437 if (l > max_below && l < level_current)
1442 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1443 return (level_current < max) ? min_above : min;
1444 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1445 return (level_current < max) ? min_above : max;
1446 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1447 return (level_current > min) ? max_below : min;
1448 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1449 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1452 return level_current;
1457 acpi_video_switch_brightness(struct work_struct *work)
1459 struct acpi_video_device *device = container_of(to_delayed_work(work),
1460 struct acpi_video_device, switch_brightness_work);
1461 unsigned long long level_current, level_next;
1462 int event = device->switch_brightness_event;
1463 int result = -EINVAL;
1465 /* no warning message if acpi_backlight=vendor or a quirk is used */
1466 if (!device->backlight)
1469 if (!device->brightness)
1472 result = acpi_video_device_lcd_get_level_current(device,
1478 level_next = acpi_video_get_next_level(device, level_current, event);
1480 result = acpi_video_device_lcd_set_level(device, level_next);
1483 backlight_force_update(device->backlight,
1484 BACKLIGHT_UPDATE_HOTKEY);
1488 acpi_handle_info(device->dev->handle,
1489 "Failed to switch brightness\n");
1492 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1495 struct acpi_video_bus *video;
1496 struct acpi_video_device *video_device;
1497 union acpi_object *buffer = NULL;
1501 if (!device || !acpi_driver_data(device))
1504 video = acpi_driver_data(device);
1506 for (i = 0; i < video->attached_count; i++) {
1507 video_device = video->attached_array[i].bind_info;
1513 if (!video_device->cap._DDC)
1518 case ACPI_VIDEO_DISPLAY_CRT:
1519 if (!video_device->flags.crt)
1522 case ACPI_VIDEO_DISPLAY_TV:
1523 if (!video_device->flags.tvout)
1526 case ACPI_VIDEO_DISPLAY_DVI:
1527 if (!video_device->flags.dvi)
1530 case ACPI_VIDEO_DISPLAY_LCD:
1531 if (!video_device->flags.lcd)
1535 } else if (video_device->device_id != device_id) {
1539 status = acpi_video_device_EDID(video_device, &buffer, length);
1541 if (ACPI_FAILURE(status) || !buffer ||
1542 buffer->type != ACPI_TYPE_BUFFER) {
1544 status = acpi_video_device_EDID(video_device, &buffer,
1546 if (ACPI_FAILURE(status) || !buffer ||
1547 buffer->type != ACPI_TYPE_BUFFER) {
1552 *edid = buffer->buffer.pointer;
1558 EXPORT_SYMBOL(acpi_video_get_edid);
1561 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1562 struct acpi_device *device)
1565 * There are systems where video module known to work fine regardless
1566 * of broken _DOD and ignoring returned value here doesn't cause
1569 acpi_video_device_enumerate(video);
1571 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
1574 /* acpi_video interface */
1577 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1578 * perform any automatic brightness change on receiving a notification.
1580 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1582 return acpi_video_bus_DOS(video, 0,
1583 acpi_osi_is_win8() ? 1 : 0);
1586 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1588 return acpi_video_bus_DOS(video, 0,
1589 acpi_osi_is_win8() ? 0 : 1);
1592 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1594 struct acpi_video_bus *video = acpi_driver_data(device);
1595 struct input_dev *input;
1598 if (!video || !video->input)
1601 input = video->input;
1604 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1605 * most likely via hotkey. */
1606 keycode = KEY_SWITCHVIDEOMODE;
1609 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1611 acpi_video_device_enumerate(video);
1612 acpi_video_device_rebind(video);
1613 keycode = KEY_SWITCHVIDEOMODE;
1616 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1617 keycode = KEY_SWITCHVIDEOMODE;
1619 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1620 keycode = KEY_VIDEO_NEXT;
1622 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1623 keycode = KEY_VIDEO_PREV;
1627 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1632 if (acpi_notifier_call_chain(device, event, 0))
1633 /* Something vetoed the keypress. */
1636 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1637 input_report_key(input, keycode, 1);
1639 input_report_key(input, keycode, 0);
1644 static void brightness_switch_event(struct acpi_video_device *video_device,
1647 if (!brightness_switch_enabled)
1650 video_device->switch_brightness_event = event;
1651 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1654 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1656 struct acpi_video_device *video_device = data;
1657 struct acpi_device *device = NULL;
1658 struct acpi_video_bus *bus;
1659 struct input_dev *input;
1665 device = video_device->dev;
1666 bus = video_device->video;
1669 if (hw_changes_brightness > 0) {
1670 if (video_device->backlight)
1671 backlight_force_update(video_device->backlight,
1672 BACKLIGHT_UPDATE_HOTKEY);
1673 acpi_notifier_call_chain(device, event, 0);
1678 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1679 brightness_switch_event(video_device, event);
1680 keycode = KEY_BRIGHTNESS_CYCLE;
1682 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1683 brightness_switch_event(video_device, event);
1684 keycode = KEY_BRIGHTNESSUP;
1686 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1687 brightness_switch_event(video_device, event);
1688 keycode = KEY_BRIGHTNESSDOWN;
1690 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1691 brightness_switch_event(video_device, event);
1692 keycode = KEY_BRIGHTNESS_ZERO;
1694 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1695 brightness_switch_event(video_device, event);
1696 keycode = KEY_DISPLAY_OFF;
1699 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1704 may_report_brightness_keys = true;
1706 acpi_notifier_call_chain(device, event, 0);
1708 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1709 input_report_key(input, keycode, 1);
1711 input_report_key(input, keycode, 0);
1716 static int acpi_video_resume(struct notifier_block *nb,
1717 unsigned long val, void *ign)
1719 struct acpi_video_bus *video;
1720 struct acpi_video_device *video_device;
1724 case PM_POST_HIBERNATION:
1725 case PM_POST_SUSPEND:
1726 case PM_POST_RESTORE:
1727 video = container_of(nb, struct acpi_video_bus, pm_nb);
1729 dev_info(&video->device->dev, "Restoring backlight state\n");
1731 for (i = 0; i < video->attached_count; i++) {
1732 video_device = video->attached_array[i].bind_info;
1733 if (video_device && video_device->brightness)
1734 acpi_video_device_lcd_set_level(video_device,
1735 video_device->brightness->curr);
1744 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1745 void **return_value)
1747 struct acpi_device *device = context;
1748 struct acpi_device *sibling;
1750 if (handle == device->handle)
1751 return AE_CTRL_TERMINATE;
1753 sibling = acpi_fetch_acpi_dev(handle);
1757 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1758 return AE_ALREADY_EXISTS;
1763 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1765 struct backlight_properties props;
1766 struct pci_dev *pdev;
1767 acpi_handle acpi_parent;
1768 struct device *parent = NULL;
1773 result = acpi_video_init_brightness(device);
1777 if (disable_backlight_sysfs_if > 0)
1780 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1785 acpi_get_parent(device->dev->handle, &acpi_parent);
1787 pdev = acpi_get_pci_dev(acpi_parent);
1789 parent = &pdev->dev;
1793 memset(&props, 0, sizeof(struct backlight_properties));
1794 props.type = BACKLIGHT_FIRMWARE;
1795 props.max_brightness =
1796 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1797 device->backlight = backlight_device_register(name,
1800 &acpi_backlight_ops,
1803 if (IS_ERR(device->backlight)) {
1804 device->backlight = NULL;
1809 * Save current brightness level in case we have to restore it
1810 * before acpi_video_device_lcd_set_level() is called next time.
1812 device->backlight->props.brightness =
1813 acpi_video_get_brightness(device->backlight);
1815 device->cooling_dev = thermal_cooling_device_register("LCD",
1816 device->dev, &video_cooling_ops);
1817 if (IS_ERR(device->cooling_dev)) {
1819 * Set cooling_dev to NULL so we don't crash trying to free it.
1820 * Also, why the hell we are returning early and not attempt to
1821 * register video output if cooling device registration failed?
1824 device->cooling_dev = NULL;
1828 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1829 device->cooling_dev->id);
1830 result = sysfs_create_link(&device->dev->dev.kobj,
1831 &device->cooling_dev->device.kobj,
1834 pr_info("sysfs link creation failed\n");
1836 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1837 &device->dev->dev.kobj, "device");
1839 pr_info("Reverse sysfs link creation failed\n");
1842 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1844 struct acpi_video_device *dev;
1845 union acpi_object *levels;
1847 mutex_lock(&video->device_list_lock);
1848 list_for_each_entry(dev, &video->video_device_list, entry) {
1849 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1852 mutex_unlock(&video->device_list_lock);
1855 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1858 * Do not create backlight device for video output
1859 * device that is not in the enumerated list.
1861 if (!acpi_video_device_in_dod(dev)) {
1862 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1867 return dev->flags.lcd;
1871 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1873 struct acpi_video_device *dev;
1875 if (video->backlight_registered)
1878 acpi_video_run_bcl_for_osi(video);
1880 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1883 mutex_lock(&video->device_list_lock);
1884 list_for_each_entry(dev, &video->video_device_list, entry) {
1885 if (acpi_video_should_register_backlight(dev))
1886 acpi_video_dev_register_backlight(dev);
1888 mutex_unlock(&video->device_list_lock);
1890 video->backlight_registered = true;
1892 video->pm_nb.notifier_call = acpi_video_resume;
1893 video->pm_nb.priority = 0;
1894 return register_pm_notifier(&video->pm_nb);
1897 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1899 if (device->backlight) {
1900 backlight_device_unregister(device->backlight);
1901 device->backlight = NULL;
1903 if (device->brightness) {
1904 kfree(device->brightness->levels);
1905 kfree(device->brightness);
1906 device->brightness = NULL;
1908 if (device->cooling_dev) {
1909 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1910 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1911 thermal_cooling_device_unregister(device->cooling_dev);
1912 device->cooling_dev = NULL;
1916 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1918 struct acpi_video_device *dev;
1921 if (!video->backlight_registered)
1924 error = unregister_pm_notifier(&video->pm_nb);
1926 mutex_lock(&video->device_list_lock);
1927 list_for_each_entry(dev, &video->video_device_list, entry)
1928 acpi_video_dev_unregister_backlight(dev);
1929 mutex_unlock(&video->device_list_lock);
1931 video->backlight_registered = false;
1936 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1939 struct acpi_device *adev = device->dev;
1941 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1942 acpi_video_device_notify, device);
1943 if (ACPI_FAILURE(status))
1944 dev_err(&adev->dev, "Error installing notify handler\n");
1946 device->flags.notify = 1;
1949 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1951 struct input_dev *input;
1952 struct acpi_video_device *dev;
1955 video->input = input = input_allocate_device();
1961 error = acpi_video_bus_start_devices(video);
1963 goto err_free_input;
1965 snprintf(video->phys, sizeof(video->phys),
1966 "%s/video/input0", acpi_device_hid(video->device));
1968 input->name = acpi_device_name(video->device);
1969 input->phys = video->phys;
1970 input->id.bustype = BUS_HOST;
1971 input->id.product = 0x06;
1972 input->dev.parent = &video->device->dev;
1973 input->evbit[0] = BIT(EV_KEY);
1974 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1975 set_bit(KEY_VIDEO_NEXT, input->keybit);
1976 set_bit(KEY_VIDEO_PREV, input->keybit);
1977 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1978 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1979 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1980 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1981 set_bit(KEY_DISPLAY_OFF, input->keybit);
1983 error = input_register_device(input);
1987 mutex_lock(&video->device_list_lock);
1988 list_for_each_entry(dev, &video->video_device_list, entry)
1989 acpi_video_dev_add_notify_handler(dev);
1990 mutex_unlock(&video->device_list_lock);
1995 acpi_video_bus_stop_devices(video);
1997 input_free_device(input);
1998 video->input = NULL;
2003 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2005 if (dev->flags.notify) {
2006 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2007 acpi_video_device_notify);
2008 dev->flags.notify = 0;
2012 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2014 struct acpi_video_device *dev;
2016 mutex_lock(&video->device_list_lock);
2017 list_for_each_entry(dev, &video->video_device_list, entry)
2018 acpi_video_dev_remove_notify_handler(dev);
2019 mutex_unlock(&video->device_list_lock);
2021 acpi_video_bus_stop_devices(video);
2022 input_unregister_device(video->input);
2023 video->input = NULL;
2026 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2028 struct acpi_video_device *dev, *next;
2030 mutex_lock(&video->device_list_lock);
2031 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2032 list_del(&dev->entry);
2035 mutex_unlock(&video->device_list_lock);
2040 static int instance;
2042 static int acpi_video_bus_add(struct acpi_device *device)
2044 struct acpi_video_bus *video;
2048 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2049 acpi_dev_parent(device)->handle, 1,
2050 acpi_video_bus_match, NULL,
2052 if (status == AE_ALREADY_EXISTS) {
2054 "Duplicate ACPI video bus devices for the"
2055 " same VGA controller, please try module "
2056 "parameter \"video.allow_duplicates=1\""
2057 "if the current driver doesn't work.\n");
2058 if (!allow_duplicates)
2062 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2066 /* a hack to fix the duplicate name "VID" problem on T61 */
2067 if (!strcmp(device->pnp.bus_id, "VID")) {
2069 device->pnp.bus_id[3] = '0' + instance;
2072 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2073 if (!strcmp(device->pnp.bus_id, "VGA")) {
2075 device->pnp.bus_id[3] = '0' + instance;
2079 video->device = device;
2080 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2081 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2082 device->driver_data = video;
2084 acpi_video_bus_find_cap(video);
2085 error = acpi_video_bus_check(video);
2087 goto err_free_video;
2089 mutex_init(&video->device_list_lock);
2090 INIT_LIST_HEAD(&video->video_device_list);
2092 error = acpi_video_bus_get_devices(video, device);
2096 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2097 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2098 video->flags.multihead ? "yes" : "no",
2099 video->flags.rom ? "yes" : "no",
2100 video->flags.post ? "yes" : "no");
2101 mutex_lock(&video_list_lock);
2102 list_add_tail(&video->entry, &video_bus_head);
2103 mutex_unlock(&video_list_lock);
2105 acpi_video_bus_register_backlight(video);
2106 acpi_video_bus_add_notify_handler(video);
2111 acpi_video_bus_put_devices(video);
2112 kfree(video->attached_array);
2115 device->driver_data = NULL;
2120 static int acpi_video_bus_remove(struct acpi_device *device)
2122 struct acpi_video_bus *video = NULL;
2125 if (!device || !acpi_driver_data(device))
2128 video = acpi_driver_data(device);
2130 acpi_video_bus_remove_notify_handler(video);
2131 acpi_video_bus_unregister_backlight(video);
2132 acpi_video_bus_put_devices(video);
2134 mutex_lock(&video_list_lock);
2135 list_del(&video->entry);
2136 mutex_unlock(&video_list_lock);
2138 kfree(video->attached_array);
2144 static int __init is_i740(struct pci_dev *dev)
2146 if (dev->device == 0x00D1)
2148 if (dev->device == 0x7000)
2153 static int __init intel_opregion_present(void)
2156 struct pci_dev *dev = NULL;
2159 for_each_pci_dev(dev) {
2160 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2162 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2164 /* We don't want to poke around undefined i740 registers */
2167 pci_read_config_dword(dev, 0xfc, &address);
2175 /* Check if the chassis-type indicates there is no builtin LCD panel */
2176 static bool dmi_is_desktop(void)
2178 const char *chassis_type;
2181 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2185 if (kstrtoul(chassis_type, 10, &type) != 0)
2189 case 0x03: /* Desktop */
2190 case 0x04: /* Low Profile Desktop */
2191 case 0x05: /* Pizza Box */
2192 case 0x06: /* Mini Tower */
2193 case 0x07: /* Tower */
2194 case 0x10: /* Lunch Box */
2195 case 0x11: /* Main Server Chassis */
2203 * We're seeing a lot of bogus backlight interfaces on newer machines
2204 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2205 * lcd flag fixes this, enable this by default on any machines which are:
2206 * 1. Win8 ready (where we also prefer the native backlight driver, so
2207 * normally the acpi_video code should not register there anyways); *and*
2208 * 2.1 Report a desktop/server DMI chassis-type, or
2209 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2212 static bool should_check_lcd_flag(void)
2214 if (!acpi_osi_is_win8())
2217 if (dmi_is_desktop())
2220 if (acpi_reduced_hardware())
2226 int acpi_video_register(void)
2230 mutex_lock(®ister_count_mutex);
2231 if (register_count) {
2233 * if the function of acpi_video_register is already called,
2234 * don't register the acpi_video_bus again and return no error.
2240 only_lcd = should_check_lcd_flag();
2242 dmi_check_system(video_dmi_table);
2244 ret = acpi_bus_register_driver(&acpi_video_bus);
2249 * When the acpi_video_bus is loaded successfully, increase
2250 * the counter reference.
2255 mutex_unlock(®ister_count_mutex);
2258 EXPORT_SYMBOL(acpi_video_register);
2260 void acpi_video_unregister(void)
2262 mutex_lock(®ister_count_mutex);
2263 if (register_count) {
2264 acpi_bus_unregister_driver(&acpi_video_bus);
2266 may_report_brightness_keys = false;
2268 mutex_unlock(®ister_count_mutex);
2270 EXPORT_SYMBOL(acpi_video_unregister);
2272 void acpi_video_unregister_backlight(void)
2274 struct acpi_video_bus *video;
2276 mutex_lock(®ister_count_mutex);
2277 if (register_count) {
2278 mutex_lock(&video_list_lock);
2279 list_for_each_entry(video, &video_bus_head, entry)
2280 acpi_video_bus_unregister_backlight(video);
2281 mutex_unlock(&video_list_lock);
2283 mutex_unlock(®ister_count_mutex);
2286 bool acpi_video_handles_brightness_key_presses(void)
2288 return may_report_brightness_keys &&
2289 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2291 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2294 * This is kind of nasty. Hardware using Intel chipsets may require
2295 * the video opregion code to be run first in order to initialise
2296 * state before any ACPI video calls are made. To handle this we defer
2297 * registration of the video class until the opregion code has run.
2300 static int __init acpi_video_init(void)
2303 * Let the module load even if ACPI is disabled (e.g. due to
2304 * a broken BIOS) so that i915.ko can still be loaded on such
2305 * old systems without an AcpiOpRegion.
2307 * acpi_video_register() will report -ENODEV later as well due
2308 * to acpi_disabled when i915.ko tries to register itself afterwards.
2313 if (intel_opregion_present())
2316 return acpi_video_register();
2319 static void __exit acpi_video_exit(void)
2321 acpi_video_detect_exit();
2322 acpi_video_unregister();
2325 module_init(acpi_video_init);
2326 module_exit(acpi_video_exit);