1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * video.c - ACPI Video Driver
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/input.h>
17 #include <linux/backlight.h>
18 #include <linux/thermal.h>
19 #include <linux/sort.h>
20 #include <linux/pci.h>
21 #include <linux/pci_ids.h>
22 #include <linux/slab.h>
23 #include <linux/dmi.h>
24 #include <linux/suspend.h>
25 #include <linux/acpi.h>
26 #include <acpi/video.h>
27 #include <linux/uaccess.h>
29 #define PREFIX "ACPI: "
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
34 #define MAX_NAME_LEN 20
36 #define _COMPONENT ACPI_VIDEO_COMPONENT
37 ACPI_MODULE_NAME("video");
39 MODULE_AUTHOR("Bruno Ducrot");
40 MODULE_DESCRIPTION("ACPI Video Driver");
41 MODULE_LICENSE("GPL");
43 static bool brightness_switch_enabled = true;
44 module_param(brightness_switch_enabled, bool, 0644);
47 * By default, we don't allow duplicate ACPI video bus devices
48 * under the same VGA controller
50 static bool allow_duplicates;
51 module_param(allow_duplicates, bool, 0644);
53 static int disable_backlight_sysfs_if = -1;
54 module_param(disable_backlight_sysfs_if, int, 0444);
56 #define REPORT_OUTPUT_KEY_EVENTS 0x01
57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
58 static int report_key_events = -1;
59 module_param(report_key_events, int, 0644);
60 MODULE_PARM_DESC(report_key_events,
61 "0: none, 1: output changes, 2: brightness changes, 3: all");
63 static int hw_changes_brightness = -1;
64 module_param(hw_changes_brightness, int, 0644);
65 MODULE_PARM_DESC(hw_changes_brightness,
66 "Set this to 1 on buggy hw which changes the brightness itself when "
67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
70 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
71 * assumed even if not actually set.
73 static bool device_id_scheme = false;
74 module_param(device_id_scheme, bool, 0444);
76 static int only_lcd = -1;
77 module_param(only_lcd, int, 0444);
79 static int register_count;
80 static DEFINE_MUTEX(register_count_mutex);
81 static DEFINE_MUTEX(video_list_lock);
82 static LIST_HEAD(video_bus_head);
83 static int acpi_video_bus_add(struct acpi_device *device);
84 static int acpi_video_bus_remove(struct acpi_device *device);
85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
86 void acpi_video_detect_exit(void);
89 * Indices in the _BCL method response: the first two items are special,
90 * the rest are all supported levels.
92 * See page 575 of the ACPI spec 3.0
94 enum acpi_video_level_idx {
95 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
96 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
97 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
100 static const struct acpi_device_id video_device_ids[] = {
104 MODULE_DEVICE_TABLE(acpi, video_device_ids);
106 static struct acpi_driver acpi_video_bus = {
108 .class = ACPI_VIDEO_CLASS,
109 .ids = video_device_ids,
111 .add = acpi_video_bus_add,
112 .remove = acpi_video_bus_remove,
113 .notify = acpi_video_bus_notify,
117 struct acpi_video_bus_flags {
118 u8 multihead:1; /* can switch video heads */
119 u8 rom:1; /* can retrieve a video rom */
120 u8 post:1; /* can configure the head to */
124 struct acpi_video_bus_cap {
125 u8 _DOS:1; /* Enable/Disable output switching */
126 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
127 u8 _ROM:1; /* Get ROM Data */
128 u8 _GPD:1; /* Get POST Device */
129 u8 _SPD:1; /* Set POST Device */
130 u8 _VPO:1; /* Video POST Options */
134 struct acpi_video_device_attrib {
135 u32 display_index:4; /* A zero-based instance of the Display */
136 u32 display_port_attachment:4; /* This field differentiates the display type */
137 u32 display_type:4; /* Describe the specific type in use */
138 u32 vendor_specific:4; /* Chipset Vendor Specific */
139 u32 bios_can_detect:1; /* BIOS can detect the device */
140 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
142 u32 pipe_id:3; /* For VGA multiple-head devices. */
143 u32 reserved:10; /* Must be 0 */
146 * The device ID might not actually follow the scheme described by this
147 * struct acpi_video_device_attrib. If it does, then this bit
148 * device_id_scheme is set; otherwise, other fields should be ignored.
150 * (but also see the global flag device_id_scheme)
152 u32 device_id_scheme:1;
155 struct acpi_video_enumerated_device {
158 struct acpi_video_device_attrib attrib;
160 struct acpi_video_device *bind_info;
163 struct acpi_video_bus {
164 struct acpi_device *device;
165 bool backlight_registered;
167 struct acpi_video_enumerated_device *attached_array;
170 struct acpi_video_bus_cap cap;
171 struct acpi_video_bus_flags flags;
172 struct list_head video_device_list;
173 struct mutex device_list_lock; /* protects video_device_list */
174 struct list_head entry;
175 struct input_dev *input;
176 char phys[32]; /* for input device */
177 struct notifier_block pm_nb;
180 struct acpi_video_device_flags {
191 struct acpi_video_device_cap {
192 u8 _ADR:1; /* Return the unique ID */
193 u8 _BCL:1; /* Query list of brightness control levels supported */
194 u8 _BCM:1; /* Set the brightness level */
195 u8 _BQC:1; /* Get current brightness level */
196 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
197 u8 _DDC:1; /* Return the EDID for this device */
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct delayed_work switch_brightness_work;
206 int switch_brightness_event;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
214 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
215 static void acpi_video_device_rebind(struct acpi_video_bus *video);
216 static void acpi_video_device_bind(struct acpi_video_bus *video,
217 struct acpi_video_device *device);
218 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
219 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
221 static int acpi_video_device_lcd_get_level_current(
222 struct acpi_video_device *device,
223 unsigned long long *level, bool raw);
224 static int acpi_video_get_next_level(struct acpi_video_device *device,
225 u32 level_current, u32 event);
226 static void acpi_video_switch_brightness(struct work_struct *work);
228 /* backlight device sysfs support */
229 static int acpi_video_get_brightness(struct backlight_device *bd)
231 unsigned long long cur_level;
233 struct acpi_video_device *vd = bl_get_data(bd);
235 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
237 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
238 if (vd->brightness->levels[i] == cur_level)
239 return i - ACPI_VIDEO_FIRST_LEVEL;
244 static int acpi_video_set_brightness(struct backlight_device *bd)
246 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
247 struct acpi_video_device *vd = bl_get_data(bd);
249 cancel_delayed_work(&vd->switch_brightness_work);
250 return acpi_video_device_lcd_set_level(vd,
251 vd->brightness->levels[request_level]);
254 static const struct backlight_ops acpi_backlight_ops = {
255 .get_brightness = acpi_video_get_brightness,
256 .update_status = acpi_video_set_brightness,
259 /* thermal cooling device callbacks */
260 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
261 unsigned long *state)
263 struct acpi_device *device = cooling_dev->devdata;
264 struct acpi_video_device *video = acpi_driver_data(device);
266 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
270 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
271 unsigned long *state)
273 struct acpi_device *device = cooling_dev->devdata;
274 struct acpi_video_device *video = acpi_driver_data(device);
275 unsigned long long level;
278 if (acpi_video_device_lcd_get_level_current(video, &level, false))
280 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
282 if (level == video->brightness->levels[offset]) {
283 *state = video->brightness->count - offset - 1;
291 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
297 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
300 state = video->brightness->count - state;
301 level = video->brightness->levels[state - 1];
302 return acpi_video_device_lcd_set_level(video, level);
305 static const struct thermal_cooling_device_ops video_cooling_ops = {
306 .get_max_state = video_get_max_state,
307 .get_cur_state = video_get_cur_state,
308 .set_cur_state = video_set_cur_state,
312 * --------------------------------------------------------------------------
314 * --------------------------------------------------------------------------
318 acpi_video_device_lcd_query_levels(acpi_handle handle,
319 union acpi_object **levels)
322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 union acpi_object *obj;
328 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
329 if (!ACPI_SUCCESS(status))
331 obj = (union acpi_object *)buffer.pointer;
332 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
333 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
343 kfree(buffer.pointer);
349 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
354 status = acpi_execute_simple_method(device->dev->handle,
356 if (ACPI_FAILURE(status)) {
357 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
361 device->brightness->curr = level;
362 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
364 if (level == device->brightness->levels[state]) {
365 if (device->backlight)
366 device->backlight->props.brightness =
367 state - ACPI_VIDEO_FIRST_LEVEL;
371 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
376 * For some buggy _BQC methods, we need to add a constant value to
377 * the _BQC return value to get the actual current brightness level
380 static int bqc_offset_aml_bug_workaround;
381 static int video_set_bqc_offset(const struct dmi_system_id *d)
383 bqc_offset_aml_bug_workaround = 9;
387 static int video_disable_backlight_sysfs_if(
388 const struct dmi_system_id *d)
390 if (disable_backlight_sysfs_if == -1)
391 disable_backlight_sysfs_if = 1;
395 static int video_set_device_id_scheme(const struct dmi_system_id *d)
397 device_id_scheme = true;
401 static int video_enable_only_lcd(const struct dmi_system_id *d)
407 static int video_set_report_key_events(const struct dmi_system_id *id)
409 if (report_key_events == -1)
410 report_key_events = (uintptr_t)id->driver_data;
414 static int video_hw_changes_brightness(
415 const struct dmi_system_id *d)
417 if (hw_changes_brightness == -1)
418 hw_changes_brightness = 1;
422 static const struct dmi_system_id video_dmi_table[] = {
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5720",
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 5710Z",
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
443 .callback = video_set_bqc_offset,
444 .ident = "eMachines E510",
446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 5315",
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
459 .callback = video_set_bqc_offset,
460 .ident = "Acer Aspire 7720",
462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback = video_disable_backlight_sysfs_if,
477 .ident = "Toshiba Portege R700",
479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback = video_disable_backlight_sysfs_if,
486 .ident = "Toshiba Portege R830",
488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback = video_disable_backlight_sysfs_if,
495 .ident = "Toshiba Satellite R830",
497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
502 .callback = video_disable_backlight_sysfs_if,
503 .ident = "Toshiba Satellite Z830",
505 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
506 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"),
510 .callback = video_disable_backlight_sysfs_if,
511 .ident = "Toshiba Portege Z830",
513 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
514 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"),
518 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
519 * but the IDs actually follow the Device ID Scheme.
522 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
523 .callback = video_set_device_id_scheme,
524 .ident = "ESPRIMO Mobile M9410",
526 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
531 * Some machines have multiple video output devices, but only the one
532 * that is the type of LCD can do the backlight control so we should not
533 * register backlight interface for other video output devices.
536 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
537 .callback = video_enable_only_lcd,
538 .ident = "ESPRIMO Mobile M9410",
540 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
541 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
545 * Some machines report wrong key events on the acpi-bus, suppress
546 * key event reporting on these. Note this is only intended to work
547 * around events which are plain wrong. In some cases we get double
548 * events, in this case acpi-video is considered the canonical source
549 * and the events from the other source should be filtered. E.g.
550 * by calling acpi_video_handles_brightness_key_presses() from the
551 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
554 .callback = video_set_report_key_events,
555 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
556 .ident = "Dell Vostro V131",
558 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
559 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
563 .callback = video_set_report_key_events,
564 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
565 .ident = "Dell Vostro 3350",
567 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
568 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
572 * Some machines change the brightness themselves when a brightness
573 * hotkey gets pressed, despite us telling them not to. In this case
574 * acpi_video_device_notify() should only call backlight_force_update(
575 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
578 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
579 .callback = video_hw_changes_brightness,
580 .ident = "Packard Bell EasyNote MZ35",
582 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
583 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
589 static unsigned long long
590 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
591 unsigned long long bqc_value)
593 unsigned long long level;
595 if (device->brightness->flags._BQC_use_index) {
597 * _BQC returns an index that doesn't account for the first 2
598 * items with special meaning (see enum acpi_video_level_idx),
599 * so we need to compensate for that by offsetting ourselves
601 if (device->brightness->flags._BCL_reversed)
602 bqc_value = device->brightness->count -
603 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
605 level = device->brightness->levels[bqc_value +
606 ACPI_VIDEO_FIRST_LEVEL];
611 level += bqc_offset_aml_bug_workaround;
617 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
618 unsigned long long *level, bool raw)
620 acpi_status status = AE_OK;
623 if (device->cap._BQC || device->cap._BCQ) {
624 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
626 status = acpi_evaluate_integer(device->dev->handle, buf,
628 if (ACPI_SUCCESS(status)) {
631 * Caller has indicated he wants the raw
632 * value returned by _BQC, so don't furtherly
633 * mess with the value.
638 *level = acpi_video_bqc_value_to_level(device, *level);
640 for (i = ACPI_VIDEO_FIRST_LEVEL;
641 i < device->brightness->count; i++)
642 if (device->brightness->levels[i] == *level) {
643 device->brightness->curr = *level;
647 * BQC returned an invalid level.
650 ACPI_WARNING((AE_INFO,
651 "%s returned an invalid level",
653 device->cap._BQC = device->cap._BCQ = 0;
657 * should we return an error or ignore this failure?
658 * dev->brightness->curr is a cached value which stores
659 * the correct current backlight level in most cases.
660 * ACPI video backlight still works w/ buggy _BQC.
661 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
663 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
664 device->cap._BQC = device->cap._BCQ = 0;
668 *level = device->brightness->curr;
673 acpi_video_device_EDID(struct acpi_video_device *device,
674 union acpi_object **edid, ssize_t length)
677 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
678 union acpi_object *obj;
679 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
680 struct acpi_object_list args = { 1, &arg0 };
688 arg0.integer.value = 1;
689 else if (length == 256)
690 arg0.integer.value = 2;
694 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
695 if (ACPI_FAILURE(status))
698 obj = buffer.pointer;
700 if (obj && obj->type == ACPI_TYPE_BUFFER)
703 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
715 * video : video bus device pointer
717 * 0. The system BIOS should NOT automatically switch(toggle)
718 * the active display output.
719 * 1. The system BIOS should automatically switch (toggle) the
720 * active display output. No switch event.
721 * 2. The _DGS value should be locked.
722 * 3. The system BIOS should not automatically switch (toggle) the
723 * active display output, but instead generate the display switch
726 * 0. The system BIOS should automatically control the brightness level
728 * - the power changes from AC to DC (ACPI appendix B)
729 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
730 * 1. The system BIOS should NOT automatically control the brightness
731 * level of the LCD when:
732 * - the power changes from AC to DC (ACPI appendix B)
733 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
739 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
743 if (!video->cap._DOS)
746 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
748 video->dos_setting = (lcd_flag << 2) | bios_flag;
749 status = acpi_execute_simple_method(video->device->handle, "_DOS",
750 (lcd_flag << 2) | bios_flag);
751 if (ACPI_FAILURE(status))
758 * Simple comparison function used to sort backlight levels.
762 acpi_video_cmp_level(const void *a, const void *b)
764 return *(int *)a - *(int *)b;
768 * Decides if _BQC/_BCQ for this system is usable
770 * We do this by changing the level first and then read out the current
771 * brightness level, if the value does not match, find out if it is using
772 * index. If not, clear the _BQC/_BCQ capability.
774 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
775 int max_level, int current_level)
777 struct acpi_video_device_brightness *br = device->brightness;
779 unsigned long long level;
782 /* don't mess with existing known broken systems */
783 if (bqc_offset_aml_bug_workaround)
787 * Some systems always report current brightness level as maximum
788 * through _BQC, we need to test another value for them. However,
789 * there is a subtlety:
791 * If the _BCL package ordering is descending, the first level
792 * (br->levels[2]) is likely to be 0, and if the number of levels
793 * matches the number of steps, we might confuse a returned level to
798 * current_level = max_level = 100
800 * returned level = 100
802 * In this case 100 means the level, not the index, and _BCM failed.
803 * Still, if the _BCL package ordering is descending, the index of
804 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
806 * This causes all _BQC calls to return bogus values causing weird
807 * behavior from the user's perspective. For example:
809 * xbacklight -set 10; xbacklight -set 20;
811 * would flash to 90% and then slowly down to the desired level (20).
813 * The solution is simple; test anything other than the first level
816 test_level = current_level == max_level
817 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
820 result = acpi_video_device_lcd_set_level(device, test_level);
824 result = acpi_video_device_lcd_get_level_current(device, &level, true);
828 if (level != test_level) {
829 /* buggy _BQC found, need to find out if it uses index */
830 if (level < br->count) {
831 if (br->flags._BCL_reversed)
832 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
833 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
834 br->flags._BQC_use_index = 1;
837 if (!br->flags._BQC_use_index)
838 device->cap._BQC = device->cap._BCQ = 0;
844 int acpi_video_get_levels(struct acpi_device *device,
845 struct acpi_video_device_brightness **dev_br,
848 union acpi_object *obj = NULL;
849 int i, max_level = 0, count = 0, level_ac_battery = 0;
850 union acpi_object *o;
851 struct acpi_video_device_brightness *br = NULL;
855 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
857 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
858 "LCD brightness level\n"));
863 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
868 br = kzalloc(sizeof(*br), GFP_KERNEL);
870 printk(KERN_ERR "can't allocate memory\n");
876 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
877 * in order to account for buggy BIOS which don't export the first two
878 * special levels (see below)
880 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
888 for (i = 0; i < obj->package.count; i++) {
889 o = (union acpi_object *)&obj->package.elements[i];
890 if (o->type != ACPI_TYPE_INTEGER) {
891 printk(KERN_ERR PREFIX "Invalid data\n");
894 value = (u32) o->integer.value;
895 /* Skip duplicate entries */
896 if (count > ACPI_VIDEO_FIRST_LEVEL
897 && br->levels[count - 1] == value)
900 br->levels[count] = value;
902 if (br->levels[count] > max_level)
903 max_level = br->levels[count];
908 * some buggy BIOS don't export the levels
909 * when machine is on AC/Battery in _BCL package.
910 * In this case, the first two elements in _BCL packages
911 * are also supported brightness levels that OS should take care of.
913 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
914 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
916 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
920 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
921 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
922 br->flags._BCL_no_ac_battery_levels = 1;
923 for (i = (count - 1 + level_ac_battery);
924 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
925 br->levels[i] = br->levels[i - level_ac_battery];
926 count += level_ac_battery;
927 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
928 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
930 /* Check if the _BCL package is in a reversed order */
931 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
932 br->flags._BCL_reversed = 1;
933 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
934 count - ACPI_VIDEO_FIRST_LEVEL,
935 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
936 acpi_video_cmp_level, NULL);
937 } else if (max_level != br->levels[count - 1])
939 "Found unordered _BCL package"));
944 *pmax_level = max_level;
953 EXPORT_SYMBOL(acpi_video_get_levels);
957 * device : video output device (LCD, CRT, ..)
960 * Maximum brightness level
962 * Allocate and initialize device->brightness.
966 acpi_video_init_brightness(struct acpi_video_device *device)
968 int i, max_level = 0;
969 unsigned long long level, level_old;
970 struct acpi_video_device_brightness *br = NULL;
973 result = acpi_video_get_levels(device->dev, &br, &max_level);
976 device->brightness = br;
978 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
979 br->curr = level = max_level;
981 if (!device->cap._BQC)
984 result = acpi_video_device_lcd_get_level_current(device,
987 goto out_free_levels;
989 result = acpi_video_bqc_quirk(device, max_level, level_old);
991 goto out_free_levels;
993 * cap._BQC may get cleared due to _BQC is found to be broken
994 * in acpi_video_bqc_quirk, so check again here.
996 if (!device->cap._BQC)
999 level = acpi_video_bqc_value_to_level(device, level_old);
1001 * On some buggy laptops, _BQC returns an uninitialized
1002 * value when invoked for the first time, i.e.
1003 * level_old is invalid (no matter whether it's a level
1004 * or an index). Set the backlight to max_level in this case.
1006 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
1007 if (level == br->levels[i])
1009 if (i == br->count || !level)
1013 result = acpi_video_device_lcd_set_level(device, level);
1015 goto out_free_levels;
1017 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1018 "found %d brightness levels\n",
1019 br->count - ACPI_VIDEO_FIRST_LEVEL));
1025 device->brightness = NULL;
1031 * device : video output device (LCD, CRT, ..)
1036 * Find out all required AML methods defined under the output
1040 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1042 if (acpi_has_method(device->dev->handle, "_ADR"))
1043 device->cap._ADR = 1;
1044 if (acpi_has_method(device->dev->handle, "_BCL"))
1045 device->cap._BCL = 1;
1046 if (acpi_has_method(device->dev->handle, "_BCM"))
1047 device->cap._BCM = 1;
1048 if (acpi_has_method(device->dev->handle, "_BQC")) {
1049 device->cap._BQC = 1;
1050 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1051 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1052 device->cap._BCQ = 1;
1055 if (acpi_has_method(device->dev->handle, "_DDC"))
1056 device->cap._DDC = 1;
1061 * device : video output device (VGA)
1066 * Find out all required AML methods defined under the video bus device.
1069 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1071 if (acpi_has_method(video->device->handle, "_DOS"))
1072 video->cap._DOS = 1;
1073 if (acpi_has_method(video->device->handle, "_DOD"))
1074 video->cap._DOD = 1;
1075 if (acpi_has_method(video->device->handle, "_ROM"))
1076 video->cap._ROM = 1;
1077 if (acpi_has_method(video->device->handle, "_GPD"))
1078 video->cap._GPD = 1;
1079 if (acpi_has_method(video->device->handle, "_SPD"))
1080 video->cap._SPD = 1;
1081 if (acpi_has_method(video->device->handle, "_VPO"))
1082 video->cap._VPO = 1;
1086 * Check whether the video bus device has required AML method to
1087 * support the desired features
1090 static int acpi_video_bus_check(struct acpi_video_bus *video)
1092 acpi_status status = -ENOENT;
1093 struct pci_dev *dev;
1098 dev = acpi_get_pci_dev(video->device->handle);
1104 * Since there is no HID, CID and so on for VGA driver, we have
1105 * to check well known required nodes.
1108 /* Does this device support video switching? */
1109 if (video->cap._DOS || video->cap._DOD) {
1110 if (!video->cap._DOS) {
1111 printk(KERN_WARNING FW_BUG
1112 "ACPI(%s) defines _DOD but not _DOS\n",
1113 acpi_device_bid(video->device));
1115 video->flags.multihead = 1;
1119 /* Does this device support retrieving a video ROM? */
1120 if (video->cap._ROM) {
1121 video->flags.rom = 1;
1125 /* Does this device support configuring which video device to POST? */
1126 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1127 video->flags.post = 1;
1135 * --------------------------------------------------------------------------
1137 * --------------------------------------------------------------------------
1140 /* device interface */
1141 static struct acpi_video_device_attrib *
1142 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1144 struct acpi_video_enumerated_device *ids;
1147 for (i = 0; i < video->attached_count; i++) {
1148 ids = &video->attached_array[i];
1149 if ((ids->value.int_val & 0xffff) == device_id)
1150 return &ids->value.attrib;
1157 acpi_video_get_device_type(struct acpi_video_bus *video,
1158 unsigned long device_id)
1160 struct acpi_video_enumerated_device *ids;
1163 for (i = 0; i < video->attached_count; i++) {
1164 ids = &video->attached_array[i];
1165 if ((ids->value.int_val & 0xffff) == device_id)
1166 return ids->value.int_val;
1173 acpi_video_bus_get_one_device(struct acpi_device *device,
1174 struct acpi_video_bus *video)
1176 unsigned long long device_id;
1177 int status, device_type;
1178 struct acpi_video_device *data;
1179 struct acpi_video_device_attrib *attribute;
1182 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1183 /* Some device omits _ADR, we skip them instead of fail */
1184 if (ACPI_FAILURE(status))
1187 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1191 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1192 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1193 device->driver_data = data;
1195 data->device_id = device_id;
1196 data->video = video;
1198 INIT_DELAYED_WORK(&data->switch_brightness_work,
1199 acpi_video_switch_brightness);
1201 attribute = acpi_video_get_device_attr(video, device_id);
1203 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1204 switch (attribute->display_type) {
1205 case ACPI_VIDEO_DISPLAY_CRT:
1206 data->flags.crt = 1;
1208 case ACPI_VIDEO_DISPLAY_TV:
1209 data->flags.tvout = 1;
1211 case ACPI_VIDEO_DISPLAY_DVI:
1212 data->flags.dvi = 1;
1214 case ACPI_VIDEO_DISPLAY_LCD:
1215 data->flags.lcd = 1;
1218 data->flags.unknown = 1;
1221 if (attribute->bios_can_detect)
1222 data->flags.bios = 1;
1224 /* Check for legacy IDs */
1225 device_type = acpi_video_get_device_type(video, device_id);
1226 /* Ignore bits 16 and 18-20 */
1227 switch (device_type & 0xffe2ffff) {
1228 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1229 data->flags.crt = 1;
1231 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1232 data->flags.lcd = 1;
1234 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1235 data->flags.tvout = 1;
1238 data->flags.unknown = 1;
1242 acpi_video_device_bind(video, data);
1243 acpi_video_device_find_cap(data);
1245 mutex_lock(&video->device_list_lock);
1246 list_add_tail(&data->entry, &video->video_device_list);
1247 mutex_unlock(&video->device_list_lock);
1254 * video : video bus device
1259 * Enumerate the video device list of the video bus,
1260 * bind the ids with the corresponding video devices
1261 * under the video bus.
1264 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1266 struct acpi_video_device *dev;
1268 mutex_lock(&video->device_list_lock);
1270 list_for_each_entry(dev, &video->video_device_list, entry)
1271 acpi_video_device_bind(video, dev);
1273 mutex_unlock(&video->device_list_lock);
1278 * video : video bus device
1279 * device : video output device under the video
1285 * Bind the ids with the corresponding video devices
1286 * under the video bus.
1290 acpi_video_device_bind(struct acpi_video_bus *video,
1291 struct acpi_video_device *device)
1293 struct acpi_video_enumerated_device *ids;
1296 for (i = 0; i < video->attached_count; i++) {
1297 ids = &video->attached_array[i];
1298 if (device->device_id == (ids->value.int_val & 0xffff)) {
1299 ids->bind_info = device;
1300 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1305 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1307 struct acpi_video_bus *video = device->video;
1311 * If we have a broken _DOD or we have more than 8 output devices
1312 * under the graphics controller node that we can't proper deal with
1313 * in the operation region code currently, no need to test.
1315 if (!video->attached_count || video->child_count > 8)
1318 for (i = 0; i < video->attached_count; i++) {
1319 if ((video->attached_array[i].value.int_val & 0xfff) ==
1320 (device->device_id & 0xfff))
1329 * video : video bus device
1334 * Call _DOD to enumerate all devices attached to display adapter
1338 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1343 struct acpi_video_enumerated_device *active_list;
1344 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1345 union acpi_object *dod = NULL;
1346 union acpi_object *obj;
1348 if (!video->cap._DOD)
1349 return AE_NOT_EXIST;
1351 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1352 if (!ACPI_SUCCESS(status)) {
1353 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1357 dod = buffer.pointer;
1358 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1359 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1364 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1365 dod->package.count));
1367 active_list = kcalloc(1 + dod->package.count,
1368 sizeof(struct acpi_video_enumerated_device),
1376 for (i = 0; i < dod->package.count; i++) {
1377 obj = &dod->package.elements[i];
1379 if (obj->type != ACPI_TYPE_INTEGER) {
1380 printk(KERN_ERR PREFIX
1381 "Invalid _DOD data in element %d\n", i);
1385 active_list[count].value.int_val = obj->integer.value;
1386 active_list[count].bind_info = NULL;
1387 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1388 (int)obj->integer.value));
1392 kfree(video->attached_array);
1394 video->attached_array = active_list;
1395 video->attached_count = count;
1398 kfree(buffer.pointer);
1403 acpi_video_get_next_level(struct acpi_video_device *device,
1404 u32 level_current, u32 event)
1406 int min, max, min_above, max_below, i, l, delta = 255;
1407 max = max_below = 0;
1408 min = min_above = 255;
1409 /* Find closest level to level_current */
1410 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1411 l = device->brightness->levels[i];
1412 if (abs(l - level_current) < abs(delta)) {
1413 delta = l - level_current;
1418 /* Ajust level_current to closest available level */
1419 level_current += delta;
1420 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1421 l = device->brightness->levels[i];
1426 if (l < min_above && l > level_current)
1428 if (l > max_below && l < level_current)
1433 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1434 return (level_current < max) ? min_above : min;
1435 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1436 return (level_current < max) ? min_above : max;
1437 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1438 return (level_current > min) ? max_below : min;
1439 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1440 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1443 return level_current;
1448 acpi_video_switch_brightness(struct work_struct *work)
1450 struct acpi_video_device *device = container_of(to_delayed_work(work),
1451 struct acpi_video_device, switch_brightness_work);
1452 unsigned long long level_current, level_next;
1453 int event = device->switch_brightness_event;
1454 int result = -EINVAL;
1456 /* no warning message if acpi_backlight=vendor or a quirk is used */
1457 if (!device->backlight)
1460 if (!device->brightness)
1463 result = acpi_video_device_lcd_get_level_current(device,
1469 level_next = acpi_video_get_next_level(device, level_current, event);
1471 result = acpi_video_device_lcd_set_level(device, level_next);
1474 backlight_force_update(device->backlight,
1475 BACKLIGHT_UPDATE_HOTKEY);
1479 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1482 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1485 struct acpi_video_bus *video;
1486 struct acpi_video_device *video_device;
1487 union acpi_object *buffer = NULL;
1491 if (!device || !acpi_driver_data(device))
1494 video = acpi_driver_data(device);
1496 for (i = 0; i < video->attached_count; i++) {
1497 video_device = video->attached_array[i].bind_info;
1503 if (!video_device->cap._DDC)
1508 case ACPI_VIDEO_DISPLAY_CRT:
1509 if (!video_device->flags.crt)
1512 case ACPI_VIDEO_DISPLAY_TV:
1513 if (!video_device->flags.tvout)
1516 case ACPI_VIDEO_DISPLAY_DVI:
1517 if (!video_device->flags.dvi)
1520 case ACPI_VIDEO_DISPLAY_LCD:
1521 if (!video_device->flags.lcd)
1525 } else if (video_device->device_id != device_id) {
1529 status = acpi_video_device_EDID(video_device, &buffer, length);
1531 if (ACPI_FAILURE(status) || !buffer ||
1532 buffer->type != ACPI_TYPE_BUFFER) {
1534 status = acpi_video_device_EDID(video_device, &buffer,
1536 if (ACPI_FAILURE(status) || !buffer ||
1537 buffer->type != ACPI_TYPE_BUFFER) {
1542 *edid = buffer->buffer.pointer;
1548 EXPORT_SYMBOL(acpi_video_get_edid);
1551 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1552 struct acpi_device *device)
1555 struct acpi_device *dev;
1558 * There are systems where video module known to work fine regardless
1559 * of broken _DOD and ignoring returned value here doesn't cause
1562 acpi_video_device_enumerate(video);
1564 list_for_each_entry(dev, &device->children, node) {
1566 status = acpi_video_bus_get_one_device(dev, video);
1568 dev_err(&dev->dev, "Can't attach device\n");
1571 video->child_count++;
1576 /* acpi_video interface */
1579 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1580 * preform any automatic brightness change on receiving a notification.
1582 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1584 return acpi_video_bus_DOS(video, 0,
1585 acpi_osi_is_win8() ? 1 : 0);
1588 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1590 return acpi_video_bus_DOS(video, 0,
1591 acpi_osi_is_win8() ? 0 : 1);
1594 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1596 struct acpi_video_bus *video = acpi_driver_data(device);
1597 struct input_dev *input;
1600 if (!video || !video->input)
1603 input = video->input;
1606 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1607 * most likely via hotkey. */
1608 keycode = KEY_SWITCHVIDEOMODE;
1611 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1613 acpi_video_device_enumerate(video);
1614 acpi_video_device_rebind(video);
1615 keycode = KEY_SWITCHVIDEOMODE;
1618 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1619 keycode = KEY_SWITCHVIDEOMODE;
1621 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1622 keycode = KEY_VIDEO_NEXT;
1624 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1625 keycode = KEY_VIDEO_PREV;
1629 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1630 "Unsupported event [0x%x]\n", event));
1634 if (acpi_notifier_call_chain(device, event, 0))
1635 /* Something vetoed the keypress. */
1638 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1639 input_report_key(input, keycode, 1);
1641 input_report_key(input, keycode, 0);
1648 static void brightness_switch_event(struct acpi_video_device *video_device,
1651 if (!brightness_switch_enabled)
1654 video_device->switch_brightness_event = event;
1655 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1658 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1660 struct acpi_video_device *video_device = data;
1661 struct acpi_device *device = NULL;
1662 struct acpi_video_bus *bus;
1663 struct input_dev *input;
1669 device = video_device->dev;
1670 bus = video_device->video;
1673 if (hw_changes_brightness > 0) {
1674 if (video_device->backlight)
1675 backlight_force_update(video_device->backlight,
1676 BACKLIGHT_UPDATE_HOTKEY);
1677 acpi_notifier_call_chain(device, event, 0);
1682 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1683 brightness_switch_event(video_device, event);
1684 keycode = KEY_BRIGHTNESS_CYCLE;
1686 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1687 brightness_switch_event(video_device, event);
1688 keycode = KEY_BRIGHTNESSUP;
1690 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1691 brightness_switch_event(video_device, event);
1692 keycode = KEY_BRIGHTNESSDOWN;
1694 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1695 brightness_switch_event(video_device, event);
1696 keycode = KEY_BRIGHTNESS_ZERO;
1698 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1699 brightness_switch_event(video_device, event);
1700 keycode = KEY_DISPLAY_OFF;
1703 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1704 "Unsupported event [0x%x]\n", event));
1708 acpi_notifier_call_chain(device, event, 0);
1710 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1711 input_report_key(input, keycode, 1);
1713 input_report_key(input, keycode, 0);
1720 static int acpi_video_resume(struct notifier_block *nb,
1721 unsigned long val, void *ign)
1723 struct acpi_video_bus *video;
1724 struct acpi_video_device *video_device;
1728 case PM_HIBERNATION_PREPARE:
1729 case PM_SUSPEND_PREPARE:
1730 case PM_RESTORE_PREPARE:
1734 video = container_of(nb, struct acpi_video_bus, pm_nb);
1736 dev_info(&video->device->dev, "Restoring backlight state\n");
1738 for (i = 0; i < video->attached_count; i++) {
1739 video_device = video->attached_array[i].bind_info;
1740 if (video_device && video_device->brightness)
1741 acpi_video_device_lcd_set_level(video_device,
1742 video_device->brightness->curr);
1749 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1750 void **return_value)
1752 struct acpi_device *device = context;
1753 struct acpi_device *sibling;
1756 if (handle == device->handle)
1757 return AE_CTRL_TERMINATE;
1759 result = acpi_bus_get_device(handle, &sibling);
1763 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1764 return AE_ALREADY_EXISTS;
1769 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1771 struct backlight_properties props;
1772 struct pci_dev *pdev;
1773 acpi_handle acpi_parent;
1774 struct device *parent = NULL;
1779 result = acpi_video_init_brightness(device);
1783 if (disable_backlight_sysfs_if > 0)
1786 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1791 acpi_get_parent(device->dev->handle, &acpi_parent);
1793 pdev = acpi_get_pci_dev(acpi_parent);
1795 parent = &pdev->dev;
1799 memset(&props, 0, sizeof(struct backlight_properties));
1800 props.type = BACKLIGHT_FIRMWARE;
1801 props.max_brightness =
1802 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1803 device->backlight = backlight_device_register(name,
1806 &acpi_backlight_ops,
1809 if (IS_ERR(device->backlight)) {
1810 device->backlight = NULL;
1815 * Save current brightness level in case we have to restore it
1816 * before acpi_video_device_lcd_set_level() is called next time.
1818 device->backlight->props.brightness =
1819 acpi_video_get_brightness(device->backlight);
1821 device->cooling_dev = thermal_cooling_device_register("LCD",
1822 device->dev, &video_cooling_ops);
1823 if (IS_ERR(device->cooling_dev)) {
1825 * Set cooling_dev to NULL so we don't crash trying to free it.
1826 * Also, why the hell we are returning early and not attempt to
1827 * register video output if cooling device registration failed?
1830 device->cooling_dev = NULL;
1834 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1835 device->cooling_dev->id);
1836 result = sysfs_create_link(&device->dev->dev.kobj,
1837 &device->cooling_dev->device.kobj,
1840 printk(KERN_ERR PREFIX "Create sysfs link\n");
1841 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1842 &device->dev->dev.kobj, "device");
1844 printk(KERN_ERR PREFIX "Create sysfs link\n");
1847 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1849 struct acpi_video_device *dev;
1850 union acpi_object *levels;
1852 mutex_lock(&video->device_list_lock);
1853 list_for_each_entry(dev, &video->video_device_list, entry) {
1854 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1857 mutex_unlock(&video->device_list_lock);
1860 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1863 * Do not create backlight device for video output
1864 * device that is not in the enumerated list.
1866 if (!acpi_video_device_in_dod(dev)) {
1867 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1872 return dev->flags.lcd;
1876 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1878 struct acpi_video_device *dev;
1880 if (video->backlight_registered)
1883 acpi_video_run_bcl_for_osi(video);
1885 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1888 mutex_lock(&video->device_list_lock);
1889 list_for_each_entry(dev, &video->video_device_list, entry) {
1890 if (acpi_video_should_register_backlight(dev))
1891 acpi_video_dev_register_backlight(dev);
1893 mutex_unlock(&video->device_list_lock);
1895 video->backlight_registered = true;
1897 video->pm_nb.notifier_call = acpi_video_resume;
1898 video->pm_nb.priority = 0;
1899 return register_pm_notifier(&video->pm_nb);
1902 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1904 if (device->backlight) {
1905 backlight_device_unregister(device->backlight);
1906 device->backlight = NULL;
1908 if (device->brightness) {
1909 kfree(device->brightness->levels);
1910 kfree(device->brightness);
1911 device->brightness = NULL;
1913 if (device->cooling_dev) {
1914 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1915 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1916 thermal_cooling_device_unregister(device->cooling_dev);
1917 device->cooling_dev = NULL;
1921 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1923 struct acpi_video_device *dev;
1926 if (!video->backlight_registered)
1929 error = unregister_pm_notifier(&video->pm_nb);
1931 mutex_lock(&video->device_list_lock);
1932 list_for_each_entry(dev, &video->video_device_list, entry)
1933 acpi_video_dev_unregister_backlight(dev);
1934 mutex_unlock(&video->device_list_lock);
1936 video->backlight_registered = false;
1941 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1944 struct acpi_device *adev = device->dev;
1946 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1947 acpi_video_device_notify, device);
1948 if (ACPI_FAILURE(status))
1949 dev_err(&adev->dev, "Error installing notify handler\n");
1951 device->flags.notify = 1;
1954 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1956 struct input_dev *input;
1957 struct acpi_video_device *dev;
1960 video->input = input = input_allocate_device();
1966 error = acpi_video_bus_start_devices(video);
1968 goto err_free_input;
1970 snprintf(video->phys, sizeof(video->phys),
1971 "%s/video/input0", acpi_device_hid(video->device));
1973 input->name = acpi_device_name(video->device);
1974 input->phys = video->phys;
1975 input->id.bustype = BUS_HOST;
1976 input->id.product = 0x06;
1977 input->dev.parent = &video->device->dev;
1978 input->evbit[0] = BIT(EV_KEY);
1979 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1980 set_bit(KEY_VIDEO_NEXT, input->keybit);
1981 set_bit(KEY_VIDEO_PREV, input->keybit);
1982 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1983 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1984 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1985 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1986 set_bit(KEY_DISPLAY_OFF, input->keybit);
1988 error = input_register_device(input);
1992 mutex_lock(&video->device_list_lock);
1993 list_for_each_entry(dev, &video->video_device_list, entry)
1994 acpi_video_dev_add_notify_handler(dev);
1995 mutex_unlock(&video->device_list_lock);
2000 acpi_video_bus_stop_devices(video);
2002 input_free_device(input);
2003 video->input = NULL;
2008 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2010 if (dev->flags.notify) {
2011 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2012 acpi_video_device_notify);
2013 dev->flags.notify = 0;
2017 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2019 struct acpi_video_device *dev;
2021 mutex_lock(&video->device_list_lock);
2022 list_for_each_entry(dev, &video->video_device_list, entry)
2023 acpi_video_dev_remove_notify_handler(dev);
2024 mutex_unlock(&video->device_list_lock);
2026 acpi_video_bus_stop_devices(video);
2027 input_unregister_device(video->input);
2028 video->input = NULL;
2031 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2033 struct acpi_video_device *dev, *next;
2035 mutex_lock(&video->device_list_lock);
2036 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2037 list_del(&dev->entry);
2040 mutex_unlock(&video->device_list_lock);
2045 static int instance;
2047 static int acpi_video_bus_add(struct acpi_device *device)
2049 struct acpi_video_bus *video;
2053 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2054 device->parent->handle, 1,
2055 acpi_video_bus_match, NULL,
2057 if (status == AE_ALREADY_EXISTS) {
2058 printk(KERN_WARNING FW_BUG
2059 "Duplicate ACPI video bus devices for the"
2060 " same VGA controller, please try module "
2061 "parameter \"video.allow_duplicates=1\""
2062 "if the current driver doesn't work.\n");
2063 if (!allow_duplicates)
2067 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2071 /* a hack to fix the duplicate name "VID" problem on T61 */
2072 if (!strcmp(device->pnp.bus_id, "VID")) {
2074 device->pnp.bus_id[3] = '0' + instance;
2077 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2078 if (!strcmp(device->pnp.bus_id, "VGA")) {
2080 device->pnp.bus_id[3] = '0' + instance;
2084 video->device = device;
2085 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2086 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2087 device->driver_data = video;
2089 acpi_video_bus_find_cap(video);
2090 error = acpi_video_bus_check(video);
2092 goto err_free_video;
2094 mutex_init(&video->device_list_lock);
2095 INIT_LIST_HEAD(&video->video_device_list);
2097 error = acpi_video_bus_get_devices(video, device);
2101 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2102 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2103 video->flags.multihead ? "yes" : "no",
2104 video->flags.rom ? "yes" : "no",
2105 video->flags.post ? "yes" : "no");
2106 mutex_lock(&video_list_lock);
2107 list_add_tail(&video->entry, &video_bus_head);
2108 mutex_unlock(&video_list_lock);
2110 acpi_video_bus_register_backlight(video);
2111 acpi_video_bus_add_notify_handler(video);
2116 acpi_video_bus_put_devices(video);
2117 kfree(video->attached_array);
2120 device->driver_data = NULL;
2125 static int acpi_video_bus_remove(struct acpi_device *device)
2127 struct acpi_video_bus *video = NULL;
2130 if (!device || !acpi_driver_data(device))
2133 video = acpi_driver_data(device);
2135 acpi_video_bus_remove_notify_handler(video);
2136 acpi_video_bus_unregister_backlight(video);
2137 acpi_video_bus_put_devices(video);
2139 mutex_lock(&video_list_lock);
2140 list_del(&video->entry);
2141 mutex_unlock(&video_list_lock);
2143 kfree(video->attached_array);
2149 static int __init is_i740(struct pci_dev *dev)
2151 if (dev->device == 0x00D1)
2153 if (dev->device == 0x7000)
2158 static int __init intel_opregion_present(void)
2161 struct pci_dev *dev = NULL;
2164 for_each_pci_dev(dev) {
2165 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2167 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2169 /* We don't want to poke around undefined i740 registers */
2172 pci_read_config_dword(dev, 0xfc, &address);
2180 /* Check if the chassis-type indicates there is no builtin LCD panel */
2181 static bool dmi_is_desktop(void)
2183 const char *chassis_type;
2186 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2190 if (kstrtoul(chassis_type, 10, &type) != 0)
2194 case 0x03: /* Desktop */
2195 case 0x04: /* Low Profile Desktop */
2196 case 0x05: /* Pizza Box */
2197 case 0x06: /* Mini Tower */
2198 case 0x07: /* Tower */
2199 case 0x10: /* Lunch Box */
2200 case 0x11: /* Main Server Chassis */
2207 int acpi_video_register(void)
2211 mutex_lock(®ister_count_mutex);
2212 if (register_count) {
2214 * if the function of acpi_video_register is already called,
2215 * don't register the acpi_video_bus again and return no error.
2221 * We're seeing a lot of bogus backlight interfaces on newer machines
2222 * without a LCD such as desktops, servers and HDMI sticks. Checking
2223 * the lcd flag fixes this, so enable this on any machines which are
2224 * win8 ready (where we also prefer the native backlight driver, so
2225 * normally the acpi_video code should not register there anyways).
2227 if (only_lcd == -1) {
2228 if (dmi_is_desktop() && acpi_osi_is_win8())
2234 dmi_check_system(video_dmi_table);
2236 ret = acpi_bus_register_driver(&acpi_video_bus);
2241 * When the acpi_video_bus is loaded successfully, increase
2242 * the counter reference.
2247 mutex_unlock(®ister_count_mutex);
2250 EXPORT_SYMBOL(acpi_video_register);
2252 void acpi_video_unregister(void)
2254 mutex_lock(®ister_count_mutex);
2255 if (register_count) {
2256 acpi_bus_unregister_driver(&acpi_video_bus);
2259 mutex_unlock(®ister_count_mutex);
2261 EXPORT_SYMBOL(acpi_video_unregister);
2263 void acpi_video_unregister_backlight(void)
2265 struct acpi_video_bus *video;
2267 mutex_lock(®ister_count_mutex);
2268 if (register_count) {
2269 mutex_lock(&video_list_lock);
2270 list_for_each_entry(video, &video_bus_head, entry)
2271 acpi_video_bus_unregister_backlight(video);
2272 mutex_unlock(&video_list_lock);
2274 mutex_unlock(®ister_count_mutex);
2277 bool acpi_video_handles_brightness_key_presses(void)
2279 bool have_video_busses;
2281 mutex_lock(&video_list_lock);
2282 have_video_busses = !list_empty(&video_bus_head);
2283 mutex_unlock(&video_list_lock);
2285 return have_video_busses &&
2286 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2288 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2291 * This is kind of nasty. Hardware using Intel chipsets may require
2292 * the video opregion code to be run first in order to initialise
2293 * state before any ACPI video calls are made. To handle this we defer
2294 * registration of the video class until the opregion code has run.
2297 static int __init acpi_video_init(void)
2300 * Let the module load even if ACPI is disabled (e.g. due to
2301 * a broken BIOS) so that i915.ko can still be loaded on such
2302 * old systems without an AcpiOpRegion.
2304 * acpi_video_register() will report -ENODEV later as well due
2305 * to acpi_disabled when i915.ko tries to register itself afterwards.
2310 if (intel_opregion_present())
2313 return acpi_video_register();
2316 static void __exit acpi_video_exit(void)
2318 acpi_video_detect_exit();
2319 acpi_video_unregister();
2324 module_init(acpi_video_init);
2325 module_exit(acpi_video_exit);