1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * video.c - ACPI Video Driver
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
10 #define pr_fmt(fmt) "ACPI: video: " fmt
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/input.h>
19 #include <linux/backlight.h>
20 #include <linux/thermal.h>
21 #include <linux/sort.h>
22 #include <linux/pci.h>
23 #include <linux/pci_ids.h>
24 #include <linux/slab.h>
25 #include <linux/dmi.h>
26 #include <linux/suspend.h>
27 #include <linux/acpi.h>
28 #include <acpi/video.h>
29 #include <linux/uaccess.h>
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
34 #define MAX_NAME_LEN 20
36 MODULE_AUTHOR("Bruno Ducrot");
37 MODULE_DESCRIPTION("ACPI Video Driver");
38 MODULE_LICENSE("GPL");
40 static bool brightness_switch_enabled
= true;
41 module_param(brightness_switch_enabled
, bool, 0644);
44 * By default, we don't allow duplicate ACPI video bus devices
45 * under the same VGA controller
47 static bool allow_duplicates
;
48 module_param(allow_duplicates
, bool, 0644);
50 #define REPORT_OUTPUT_KEY_EVENTS 0x01
51 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
52 static int report_key_events
= -1;
53 module_param(report_key_events
, int, 0644);
54 MODULE_PARM_DESC(report_key_events
,
55 "0: none, 1: output changes, 2: brightness changes, 3: all");
57 static int hw_changes_brightness
= -1;
58 module_param(hw_changes_brightness
, int, 0644);
59 MODULE_PARM_DESC(hw_changes_brightness
,
60 "Set this to 1 on buggy hw which changes the brightness itself when "
61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
65 * assumed even if not actually set.
67 static bool device_id_scheme
= false;
68 module_param(device_id_scheme
, bool, 0444);
70 static int only_lcd
= -1;
71 module_param(only_lcd
, int, 0444);
73 static bool may_report_brightness_keys
;
74 static int register_count
;
75 static DEFINE_MUTEX(register_count_mutex
);
76 static DEFINE_MUTEX(video_list_lock
);
77 static LIST_HEAD(video_bus_head
);
78 static int acpi_video_bus_add(struct acpi_device
*device
);
79 static void acpi_video_bus_remove(struct acpi_device
*device
);
80 static void acpi_video_bus_notify(acpi_handle handle
, u32 event
, void *data
);
83 * Indices in the _BCL method response: the first two items are special,
84 * the rest are all supported levels.
86 * See page 575 of the ACPI spec 3.0
88 enum acpi_video_level_idx
{
89 ACPI_VIDEO_AC_LEVEL
, /* level when machine has full power */
90 ACPI_VIDEO_BATTERY_LEVEL
, /* level when machine is on batteries */
91 ACPI_VIDEO_FIRST_LEVEL
, /* actual supported levels begin here */
94 static const struct acpi_device_id video_device_ids
[] = {
98 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
100 static struct acpi_driver acpi_video_bus
= {
102 .class = ACPI_VIDEO_CLASS
,
103 .ids
= video_device_ids
,
105 .add
= acpi_video_bus_add
,
106 .remove
= acpi_video_bus_remove
,
110 struct acpi_video_bus_flags
{
111 u8 multihead
:1; /* can switch video heads */
112 u8 rom
:1; /* can retrieve a video rom */
113 u8 post
:1; /* can configure the head to */
117 struct acpi_video_bus_cap
{
118 u8 _DOS
:1; /* Enable/Disable output switching */
119 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
120 u8 _ROM
:1; /* Get ROM Data */
121 u8 _GPD
:1; /* Get POST Device */
122 u8 _SPD
:1; /* Set POST Device */
123 u8 _VPO
:1; /* Video POST Options */
127 struct acpi_video_device_attrib
{
128 u32 display_index
:4; /* A zero-based instance of the Display */
129 u32 display_port_attachment
:4; /* This field differentiates the display type */
130 u32 display_type
:4; /* Describe the specific type in use */
131 u32 vendor_specific
:4; /* Chipset Vendor Specific */
132 u32 bios_can_detect
:1; /* BIOS can detect the device */
133 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
135 u32 pipe_id
:3; /* For VGA multiple-head devices. */
136 u32 reserved
:10; /* Must be 0 */
139 * The device ID might not actually follow the scheme described by this
140 * struct acpi_video_device_attrib. If it does, then this bit
141 * device_id_scheme is set; otherwise, other fields should be ignored.
143 * (but also see the global flag device_id_scheme)
145 u32 device_id_scheme
:1;
148 struct acpi_video_enumerated_device
{
151 struct acpi_video_device_attrib attrib
;
153 struct acpi_video_device
*bind_info
;
156 struct acpi_video_bus
{
157 struct acpi_device
*device
;
158 bool backlight_registered
;
160 struct acpi_video_enumerated_device
*attached_array
;
163 struct acpi_video_bus_cap cap
;
164 struct acpi_video_bus_flags flags
;
165 struct list_head video_device_list
;
166 struct mutex device_list_lock
; /* protects video_device_list */
167 struct list_head entry
;
168 struct input_dev
*input
;
169 char phys
[32]; /* for input device */
170 struct notifier_block pm_nb
;
173 struct acpi_video_device_flags
{
184 struct acpi_video_device_cap
{
185 u8 _ADR
:1; /* Return the unique ID */
186 u8 _BCL
:1; /* Query list of brightness control levels supported */
187 u8 _BCM
:1; /* Set the brightness level */
188 u8 _BQC
:1; /* Get current brightness level */
189 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
190 u8 _DDC
:1; /* Return the EDID for this device */
193 struct acpi_video_device
{
194 unsigned long device_id
;
195 struct acpi_video_device_flags flags
;
196 struct acpi_video_device_cap cap
;
197 struct list_head entry
;
198 struct delayed_work switch_brightness_work
;
199 int switch_brightness_event
;
200 struct acpi_video_bus
*video
;
201 struct acpi_device
*dev
;
202 struct acpi_video_device_brightness
*brightness
;
203 struct backlight_device
*backlight
;
204 struct thermal_cooling_device
*cooling_dev
;
207 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
208 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
209 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
210 struct acpi_video_device
*device
);
211 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
212 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
214 static int acpi_video_device_lcd_get_level_current(
215 struct acpi_video_device
*device
,
216 unsigned long long *level
, bool raw
);
217 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
218 u32 level_current
, u32 event
);
219 static void acpi_video_switch_brightness(struct work_struct
*work
);
221 /* backlight device sysfs support */
222 static int acpi_video_get_brightness(struct backlight_device
*bd
)
224 unsigned long long cur_level
;
226 struct acpi_video_device
*vd
= bl_get_data(bd
);
228 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
230 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< vd
->brightness
->count
; i
++) {
231 if (vd
->brightness
->levels
[i
] == cur_level
)
232 return i
- ACPI_VIDEO_FIRST_LEVEL
;
237 static int acpi_video_set_brightness(struct backlight_device
*bd
)
239 int request_level
= bd
->props
.brightness
+ ACPI_VIDEO_FIRST_LEVEL
;
240 struct acpi_video_device
*vd
= bl_get_data(bd
);
242 cancel_delayed_work(&vd
->switch_brightness_work
);
243 return acpi_video_device_lcd_set_level(vd
,
244 vd
->brightness
->levels
[request_level
]);
247 static const struct backlight_ops acpi_backlight_ops
= {
248 .get_brightness
= acpi_video_get_brightness
,
249 .update_status
= acpi_video_set_brightness
,
252 /* thermal cooling device callbacks */
253 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
,
254 unsigned long *state
)
256 struct acpi_device
*device
= cooling_dev
->devdata
;
257 struct acpi_video_device
*video
= acpi_driver_data(device
);
259 *state
= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
263 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
,
264 unsigned long *state
)
266 struct acpi_device
*device
= cooling_dev
->devdata
;
267 struct acpi_video_device
*video
= acpi_driver_data(device
);
268 unsigned long long level
;
271 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
273 for (offset
= ACPI_VIDEO_FIRST_LEVEL
; offset
< video
->brightness
->count
;
275 if (level
== video
->brightness
->levels
[offset
]) {
276 *state
= video
->brightness
->count
- offset
- 1;
284 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
286 struct acpi_device
*device
= cooling_dev
->devdata
;
287 struct acpi_video_device
*video
= acpi_driver_data(device
);
290 if (state
>= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
)
293 state
= video
->brightness
->count
- state
;
294 level
= video
->brightness
->levels
[state
- 1];
295 return acpi_video_device_lcd_set_level(video
, level
);
298 static const struct thermal_cooling_device_ops video_cooling_ops
= {
299 .get_max_state
= video_get_max_state
,
300 .get_cur_state
= video_get_cur_state
,
301 .set_cur_state
= video_set_cur_state
,
305 * --------------------------------------------------------------------------
307 * --------------------------------------------------------------------------
311 acpi_video_device_lcd_query_levels(acpi_handle handle
,
312 union acpi_object
**levels
)
315 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
316 union acpi_object
*obj
;
321 status
= acpi_evaluate_object(handle
, "_BCL", NULL
, &buffer
);
322 if (ACPI_FAILURE(status
))
324 obj
= (union acpi_object
*)buffer
.pointer
;
325 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
326 acpi_handle_info(handle
, "Invalid _BCL data\n");
336 kfree(buffer
.pointer
);
342 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
347 status
= acpi_execute_simple_method(device
->dev
->handle
,
349 if (ACPI_FAILURE(status
)) {
350 acpi_handle_info(device
->dev
->handle
, "_BCM evaluation failed\n");
354 device
->brightness
->curr
= level
;
355 for (state
= ACPI_VIDEO_FIRST_LEVEL
; state
< device
->brightness
->count
;
357 if (level
== device
->brightness
->levels
[state
]) {
358 if (device
->backlight
)
359 device
->backlight
->props
.brightness
=
360 state
- ACPI_VIDEO_FIRST_LEVEL
;
364 acpi_handle_info(device
->dev
->handle
, "Current brightness invalid\n");
369 * For some buggy _BQC methods, we need to add a constant value to
370 * the _BQC return value to get the actual current brightness level
373 static int bqc_offset_aml_bug_workaround
;
374 static int video_set_bqc_offset(const struct dmi_system_id
*d
)
376 bqc_offset_aml_bug_workaround
= 9;
380 static int video_set_device_id_scheme(const struct dmi_system_id
*d
)
382 device_id_scheme
= true;
386 static int video_enable_only_lcd(const struct dmi_system_id
*d
)
392 static int video_set_report_key_events(const struct dmi_system_id
*id
)
394 if (report_key_events
== -1)
395 report_key_events
= (uintptr_t)id
->driver_data
;
399 static int video_hw_changes_brightness(
400 const struct dmi_system_id
*d
)
402 if (hw_changes_brightness
== -1)
403 hw_changes_brightness
= 1;
407 static const struct dmi_system_id video_dmi_table
[] = {
409 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
412 .callback
= video_set_bqc_offset
,
413 .ident
= "Acer Aspire 5720",
415 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
416 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
420 .callback
= video_set_bqc_offset
,
421 .ident
= "Acer Aspire 5710Z",
423 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
428 .callback
= video_set_bqc_offset
,
429 .ident
= "eMachines E510",
431 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
432 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
436 .callback
= video_set_bqc_offset
,
437 .ident
= "Acer Aspire 5315",
439 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
440 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
444 .callback
= video_set_bqc_offset
,
445 .ident
= "Acer Aspire 7720",
447 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
453 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
454 * but the IDs actually follow the Device ID Scheme.
457 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
458 .callback
= video_set_device_id_scheme
,
459 .ident
= "ESPRIMO Mobile M9410",
461 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
462 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
466 * Some machines have multiple video output devices, but only the one
467 * that is the type of LCD can do the backlight control so we should not
468 * register backlight interface for other video output devices.
471 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
472 .callback
= video_enable_only_lcd
,
473 .ident
= "ESPRIMO Mobile M9410",
475 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
476 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
480 * Some machines report wrong key events on the acpi-bus, suppress
481 * key event reporting on these. Note this is only intended to work
482 * around events which are plain wrong. In some cases we get double
483 * events, in this case acpi-video is considered the canonical source
484 * and the events from the other source should be filtered. E.g.
485 * by calling acpi_video_handles_brightness_key_presses() from the
486 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
489 .callback
= video_set_report_key_events
,
490 .driver_data
= (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS
),
491 .ident
= "Dell Vostro V131",
493 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
494 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro V131"),
498 .callback
= video_set_report_key_events
,
499 .driver_data
= (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS
),
500 .ident
= "Dell Vostro 3350",
502 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
503 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro 3350"),
507 * Some machines change the brightness themselves when a brightness
508 * hotkey gets pressed, despite us telling them not to. In this case
509 * acpi_video_device_notify() should only call backlight_force_update(
510 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
513 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
514 .callback
= video_hw_changes_brightness
,
515 .ident
= "Packard Bell EasyNote MZ35",
517 DMI_MATCH(DMI_SYS_VENDOR
, "Packard Bell"),
518 DMI_MATCH(DMI_PRODUCT_NAME
, "EasyNote MZ35"),
524 static unsigned long long
525 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
526 unsigned long long bqc_value
)
528 unsigned long long level
;
530 if (device
->brightness
->flags
._BQC_use_index
) {
532 * _BQC returns an index that doesn't account for the first 2
533 * items with special meaning (see enum acpi_video_level_idx),
534 * so we need to compensate for that by offsetting ourselves
536 if (device
->brightness
->flags
._BCL_reversed
)
537 bqc_value
= device
->brightness
->count
-
538 ACPI_VIDEO_FIRST_LEVEL
- 1 - bqc_value
;
540 level
= device
->brightness
->levels
[bqc_value
+
541 ACPI_VIDEO_FIRST_LEVEL
];
546 level
+= bqc_offset_aml_bug_workaround
;
552 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
553 unsigned long long *level
, bool raw
)
555 acpi_status status
= AE_OK
;
558 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
559 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
561 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
563 if (ACPI_SUCCESS(status
)) {
566 * Caller has indicated he wants the raw
567 * value returned by _BQC, so don't furtherly
568 * mess with the value.
573 *level
= acpi_video_bqc_value_to_level(device
, *level
);
575 for (i
= ACPI_VIDEO_FIRST_LEVEL
;
576 i
< device
->brightness
->count
; i
++)
577 if (device
->brightness
->levels
[i
] == *level
) {
578 device
->brightness
->curr
= *level
;
582 * BQC returned an invalid level.
585 acpi_handle_info(device
->dev
->handle
,
586 "%s returned an invalid level", buf
);
587 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
591 * should we return an error or ignore this failure?
592 * dev->brightness->curr is a cached value which stores
593 * the correct current backlight level in most cases.
594 * ACPI video backlight still works w/ buggy _BQC.
595 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
597 acpi_handle_info(device
->dev
->handle
,
598 "%s evaluation failed", buf
);
599 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
603 *level
= device
->brightness
->curr
;
608 acpi_video_device_EDID(struct acpi_video_device
*device
,
609 union acpi_object
**edid
, ssize_t length
)
612 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
613 union acpi_object
*obj
;
614 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
615 struct acpi_object_list args
= { 1, &arg0
};
623 arg0
.integer
.value
= 1;
624 else if (length
== 256)
625 arg0
.integer
.value
= 2;
629 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
630 if (ACPI_FAILURE(status
))
633 obj
= buffer
.pointer
;
635 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
638 acpi_handle_info(device
->dev
->handle
, "Invalid _DDC data\n");
650 * video : video bus device pointer
652 * 0. The system BIOS should NOT automatically switch(toggle)
653 * the active display output.
654 * 1. The system BIOS should automatically switch (toggle) the
655 * active display output. No switch event.
656 * 2. The _DGS value should be locked.
657 * 3. The system BIOS should not automatically switch (toggle) the
658 * active display output, but instead generate the display switch
661 * 0. The system BIOS should automatically control the brightness level
663 * - the power changes from AC to DC (ACPI appendix B)
664 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
665 * 1. The system BIOS should NOT automatically control the brightness
666 * level of the LCD when:
667 * - the power changes from AC to DC (ACPI appendix B)
668 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
674 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
678 if (!video
->cap
._DOS
)
681 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
683 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
684 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
685 (lcd_flag
<< 2) | bios_flag
);
686 if (ACPI_FAILURE(status
))
693 * Simple comparison function used to sort backlight levels.
697 acpi_video_cmp_level(const void *a
, const void *b
)
699 return *(int *)a
- *(int *)b
;
703 * Decides if _BQC/_BCQ for this system is usable
705 * We do this by changing the level first and then read out the current
706 * brightness level, if the value does not match, find out if it is using
707 * index. If not, clear the _BQC/_BCQ capability.
709 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
710 int max_level
, int current_level
)
712 struct acpi_video_device_brightness
*br
= device
->brightness
;
714 unsigned long long level
;
717 /* don't mess with existing known broken systems */
718 if (bqc_offset_aml_bug_workaround
)
722 * Some systems always report current brightness level as maximum
723 * through _BQC, we need to test another value for them. However,
724 * there is a subtlety:
726 * If the _BCL package ordering is descending, the first level
727 * (br->levels[2]) is likely to be 0, and if the number of levels
728 * matches the number of steps, we might confuse a returned level to
733 * current_level = max_level = 100
735 * returned level = 100
737 * In this case 100 means the level, not the index, and _BCM failed.
738 * Still, if the _BCL package ordering is descending, the index of
739 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
741 * This causes all _BQC calls to return bogus values causing weird
742 * behavior from the user's perspective. For example:
744 * xbacklight -set 10; xbacklight -set 20;
746 * would flash to 90% and then slowly down to the desired level (20).
748 * The solution is simple; test anything other than the first level
751 test_level
= current_level
== max_level
752 ? br
->levels
[ACPI_VIDEO_FIRST_LEVEL
+ 1]
755 result
= acpi_video_device_lcd_set_level(device
, test_level
);
759 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
763 if (level
!= test_level
) {
764 /* buggy _BQC found, need to find out if it uses index */
765 if (level
< br
->count
) {
766 if (br
->flags
._BCL_reversed
)
767 level
= br
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1 - level
;
768 if (br
->levels
[level
+ ACPI_VIDEO_FIRST_LEVEL
] == test_level
)
769 br
->flags
._BQC_use_index
= 1;
772 if (!br
->flags
._BQC_use_index
)
773 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
779 int acpi_video_get_levels(struct acpi_device
*device
,
780 struct acpi_video_device_brightness
**dev_br
,
783 union acpi_object
*obj
= NULL
;
784 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
785 union acpi_object
*o
;
786 struct acpi_video_device_brightness
*br
= NULL
;
790 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device
->handle
, &obj
))) {
791 acpi_handle_debug(device
->handle
,
792 "Could not query available LCD brightness level\n");
797 if (obj
->package
.count
< ACPI_VIDEO_FIRST_LEVEL
) {
802 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
809 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
810 * in order to account for buggy BIOS which don't export the first two
811 * special levels (see below)
813 br
->levels
= kmalloc_array(obj
->package
.count
+ ACPI_VIDEO_FIRST_LEVEL
,
821 for (i
= 0; i
< obj
->package
.count
; i
++) {
822 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
823 if (o
->type
!= ACPI_TYPE_INTEGER
) {
824 acpi_handle_info(device
->handle
, "Invalid data\n");
827 value
= (u32
) o
->integer
.value
;
828 /* Skip duplicate entries */
829 if (count
> ACPI_VIDEO_FIRST_LEVEL
830 && br
->levels
[count
- 1] == value
)
833 br
->levels
[count
] = value
;
835 if (br
->levels
[count
] > max_level
)
836 max_level
= br
->levels
[count
];
841 * some buggy BIOS don't export the levels
842 * when machine is on AC/Battery in _BCL package.
843 * In this case, the first two elements in _BCL packages
844 * are also supported brightness levels that OS should take care of.
846 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< count
; i
++) {
847 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_AC_LEVEL
])
849 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_BATTERY_LEVEL
])
853 if (level_ac_battery
< ACPI_VIDEO_FIRST_LEVEL
) {
854 level_ac_battery
= ACPI_VIDEO_FIRST_LEVEL
- level_ac_battery
;
855 br
->flags
._BCL_no_ac_battery_levels
= 1;
856 for (i
= (count
- 1 + level_ac_battery
);
857 i
>= ACPI_VIDEO_FIRST_LEVEL
; i
--)
858 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
859 count
+= level_ac_battery
;
860 } else if (level_ac_battery
> ACPI_VIDEO_FIRST_LEVEL
)
861 acpi_handle_info(device
->handle
,
862 "Too many duplicates in _BCL package");
864 /* Check if the _BCL package is in a reversed order */
865 if (max_level
== br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]) {
866 br
->flags
._BCL_reversed
= 1;
867 sort(&br
->levels
[ACPI_VIDEO_FIRST_LEVEL
],
868 count
- ACPI_VIDEO_FIRST_LEVEL
,
869 sizeof(br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]),
870 acpi_video_cmp_level
, NULL
);
871 } else if (max_level
!= br
->levels
[count
- 1])
872 acpi_handle_info(device
->handle
,
873 "Found unordered _BCL package");
878 *pmax_level
= max_level
;
887 EXPORT_SYMBOL(acpi_video_get_levels
);
891 * device : video output device (LCD, CRT, ..)
894 * Maximum brightness level
896 * Allocate and initialize device->brightness.
900 acpi_video_init_brightness(struct acpi_video_device
*device
)
902 int i
, max_level
= 0;
903 unsigned long long level
, level_old
;
904 struct acpi_video_device_brightness
*br
= NULL
;
907 result
= acpi_video_get_levels(device
->dev
, &br
, &max_level
);
910 device
->brightness
= br
;
912 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
913 br
->curr
= level
= max_level
;
915 if (!device
->cap
._BQC
)
918 result
= acpi_video_device_lcd_get_level_current(device
,
921 goto out_free_levels
;
923 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
925 goto out_free_levels
;
927 * cap._BQC may get cleared due to _BQC is found to be broken
928 * in acpi_video_bqc_quirk, so check again here.
930 if (!device
->cap
._BQC
)
933 level
= acpi_video_bqc_value_to_level(device
, level_old
);
935 * On some buggy laptops, _BQC returns an uninitialized
936 * value when invoked for the first time, i.e.
937 * level_old is invalid (no matter whether it's a level
938 * or an index). Set the backlight to max_level in this case.
940 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< br
->count
; i
++)
941 if (level
== br
->levels
[i
])
943 if (i
== br
->count
|| !level
)
947 result
= acpi_video_device_lcd_set_level(device
, level
);
949 goto out_free_levels
;
951 acpi_handle_debug(device
->dev
->handle
, "found %d brightness levels\n",
952 br
->count
- ACPI_VIDEO_FIRST_LEVEL
);
959 device
->brightness
= NULL
;
965 * device : video output device (LCD, CRT, ..)
970 * Find out all required AML methods defined under the output
974 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
976 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
977 device
->cap
._ADR
= 1;
978 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
979 device
->cap
._BCL
= 1;
980 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
981 device
->cap
._BCM
= 1;
982 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
983 device
->cap
._BQC
= 1;
984 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
985 acpi_handle_info(device
->dev
->handle
,
986 "_BCQ is used instead of _BQC\n");
987 device
->cap
._BCQ
= 1;
990 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
991 device
->cap
._DDC
= 1;
996 * device : video output device (VGA)
1001 * Find out all required AML methods defined under the video bus device.
1004 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
1006 if (acpi_has_method(video
->device
->handle
, "_DOS"))
1007 video
->cap
._DOS
= 1;
1008 if (acpi_has_method(video
->device
->handle
, "_DOD"))
1009 video
->cap
._DOD
= 1;
1010 if (acpi_has_method(video
->device
->handle
, "_ROM"))
1011 video
->cap
._ROM
= 1;
1012 if (acpi_has_method(video
->device
->handle
, "_GPD"))
1013 video
->cap
._GPD
= 1;
1014 if (acpi_has_method(video
->device
->handle
, "_SPD"))
1015 video
->cap
._SPD
= 1;
1016 if (acpi_has_method(video
->device
->handle
, "_VPO"))
1017 video
->cap
._VPO
= 1;
1021 * Check whether the video bus device has required AML method to
1022 * support the desired features
1025 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
1027 acpi_status status
= -ENOENT
;
1028 struct pci_dev
*dev
;
1033 dev
= acpi_get_pci_dev(video
->device
->handle
);
1039 * Since there is no HID, CID and so on for VGA driver, we have
1040 * to check well known required nodes.
1043 /* Does this device support video switching? */
1044 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1045 if (!video
->cap
._DOS
) {
1046 pr_info(FW_BUG
"ACPI(%s) defines _DOD but not _DOS\n",
1047 acpi_device_bid(video
->device
));
1049 video
->flags
.multihead
= 1;
1053 /* Does this device support retrieving a video ROM? */
1054 if (video
->cap
._ROM
) {
1055 video
->flags
.rom
= 1;
1059 /* Does this device support configuring which video device to POST? */
1060 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1061 video
->flags
.post
= 1;
1069 * --------------------------------------------------------------------------
1071 * --------------------------------------------------------------------------
1074 /* device interface */
1075 static struct acpi_video_device_attrib
*
1076 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1078 struct acpi_video_enumerated_device
*ids
;
1081 for (i
= 0; i
< video
->attached_count
; i
++) {
1082 ids
= &video
->attached_array
[i
];
1083 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1084 return &ids
->value
.attrib
;
1091 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1092 unsigned long device_id
)
1094 struct acpi_video_enumerated_device
*ids
;
1097 for (i
= 0; i
< video
->attached_count
; i
++) {
1098 ids
= &video
->attached_array
[i
];
1099 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1100 return ids
->value
.int_val
;
1106 static int acpi_video_bus_get_one_device(struct acpi_device
*device
, void *arg
)
1108 struct acpi_video_bus
*video
= arg
;
1109 struct acpi_video_device_attrib
*attribute
;
1110 struct acpi_video_device
*data
;
1111 unsigned long long device_id
;
1115 status
= acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1116 /* Skip devices without _ADR instead of failing. */
1117 if (ACPI_FAILURE(status
))
1120 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1122 dev_dbg(&device
->dev
, "Cannot attach\n");
1126 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1127 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1128 device
->driver_data
= data
;
1130 data
->device_id
= device_id
;
1131 data
->video
= video
;
1133 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1134 acpi_video_switch_brightness
);
1136 attribute
= acpi_video_get_device_attr(video
, device_id
);
1138 if (attribute
&& (attribute
->device_id_scheme
|| device_id_scheme
)) {
1139 switch (attribute
->display_type
) {
1140 case ACPI_VIDEO_DISPLAY_CRT
:
1141 data
->flags
.crt
= 1;
1143 case ACPI_VIDEO_DISPLAY_TV
:
1144 data
->flags
.tvout
= 1;
1146 case ACPI_VIDEO_DISPLAY_DVI
:
1147 data
->flags
.dvi
= 1;
1149 case ACPI_VIDEO_DISPLAY_LCD
:
1150 data
->flags
.lcd
= 1;
1153 data
->flags
.unknown
= 1;
1156 if (attribute
->bios_can_detect
)
1157 data
->flags
.bios
= 1;
1159 /* Check for legacy IDs */
1160 device_type
= acpi_video_get_device_type(video
, device_id
);
1161 /* Ignore bits 16 and 18-20 */
1162 switch (device_type
& 0xffe2ffff) {
1163 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1164 data
->flags
.crt
= 1;
1166 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1167 data
->flags
.lcd
= 1;
1169 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1170 data
->flags
.tvout
= 1;
1173 data
->flags
.unknown
= 1;
1177 acpi_video_device_bind(video
, data
);
1178 acpi_video_device_find_cap(data
);
1180 if (data
->cap
._BCM
&& data
->cap
._BCL
)
1181 may_report_brightness_keys
= true;
1183 mutex_lock(&video
->device_list_lock
);
1184 list_add_tail(&data
->entry
, &video
->video_device_list
);
1185 mutex_unlock(&video
->device_list_lock
);
1188 video
->child_count
++;
1194 * video : video bus device
1199 * Enumerate the video device list of the video bus,
1200 * bind the ids with the corresponding video devices
1201 * under the video bus.
1204 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1206 struct acpi_video_device
*dev
;
1208 mutex_lock(&video
->device_list_lock
);
1210 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1211 acpi_video_device_bind(video
, dev
);
1213 mutex_unlock(&video
->device_list_lock
);
1218 * video : video bus device
1219 * device : video output device under the video
1225 * Bind the ids with the corresponding video devices
1226 * under the video bus.
1230 acpi_video_device_bind(struct acpi_video_bus
*video
,
1231 struct acpi_video_device
*device
)
1233 struct acpi_video_enumerated_device
*ids
;
1236 for (i
= 0; i
< video
->attached_count
; i
++) {
1237 ids
= &video
->attached_array
[i
];
1238 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1239 ids
->bind_info
= device
;
1240 acpi_handle_debug(video
->device
->handle
, "%s: %d\n",
1246 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1248 struct acpi_video_bus
*video
= device
->video
;
1252 * If we have a broken _DOD or we have more than 8 output devices
1253 * under the graphics controller node that we can't proper deal with
1254 * in the operation region code currently, no need to test.
1256 if (!video
->attached_count
|| video
->child_count
> 8)
1259 for (i
= 0; i
< video
->attached_count
; i
++) {
1260 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1261 (device
->device_id
& 0xfff))
1270 * video : video bus device
1275 * Call _DOD to enumerate all devices attached to display adapter
1279 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1284 struct acpi_video_enumerated_device
*active_list
;
1285 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1286 union acpi_object
*dod
= NULL
;
1287 union acpi_object
*obj
;
1289 if (!video
->cap
._DOD
)
1290 return AE_NOT_EXIST
;
1292 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1293 if (ACPI_FAILURE(status
)) {
1294 acpi_handle_info(video
->device
->handle
,
1295 "_DOD evaluation failed: %s\n",
1296 acpi_format_exception(status
));
1300 dod
= buffer
.pointer
;
1301 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1302 acpi_handle_info(video
->device
->handle
, "Invalid _DOD data\n");
1307 acpi_handle_debug(video
->device
->handle
, "Found %d video heads in _DOD\n",
1308 dod
->package
.count
);
1310 active_list
= kcalloc(1 + dod
->package
.count
,
1311 sizeof(struct acpi_video_enumerated_device
),
1319 for (i
= 0; i
< dod
->package
.count
; i
++) {
1320 obj
= &dod
->package
.elements
[i
];
1322 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1323 acpi_handle_info(video
->device
->handle
,
1324 "Invalid _DOD data in element %d\n", i
);
1328 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1329 active_list
[count
].bind_info
= NULL
;
1331 acpi_handle_debug(video
->device
->handle
,
1332 "_DOD element[%d] = %d\n", i
,
1333 (int)obj
->integer
.value
);
1338 kfree(video
->attached_array
);
1340 video
->attached_array
= active_list
;
1341 video
->attached_count
= count
;
1344 kfree(buffer
.pointer
);
1349 acpi_video_get_next_level(struct acpi_video_device
*device
,
1350 u32 level_current
, u32 event
)
1352 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1353 max
= max_below
= 0;
1354 min
= min_above
= 255;
1355 /* Find closest level to level_current */
1356 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1357 l
= device
->brightness
->levels
[i
];
1358 if (abs(l
- level_current
) < abs(delta
)) {
1359 delta
= l
- level_current
;
1364 /* Adjust level_current to closest available level */
1365 level_current
+= delta
;
1366 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1367 l
= device
->brightness
->levels
[i
];
1372 if (l
< min_above
&& l
> level_current
)
1374 if (l
> max_below
&& l
< level_current
)
1379 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1380 return (level_current
< max
) ? min_above
: min
;
1381 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1382 return (level_current
< max
) ? min_above
: max
;
1383 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1384 return (level_current
> min
) ? max_below
: min
;
1385 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1386 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1389 return level_current
;
1394 acpi_video_switch_brightness(struct work_struct
*work
)
1396 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1397 struct acpi_video_device
, switch_brightness_work
);
1398 unsigned long long level_current
, level_next
;
1399 int event
= device
->switch_brightness_event
;
1400 int result
= -EINVAL
;
1402 /* no warning message if acpi_backlight=vendor or a quirk is used */
1403 if (!device
->backlight
)
1406 if (!device
->brightness
)
1409 result
= acpi_video_device_lcd_get_level_current(device
,
1415 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1417 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1420 backlight_force_update(device
->backlight
,
1421 BACKLIGHT_UPDATE_HOTKEY
);
1425 acpi_handle_info(device
->dev
->handle
,
1426 "Failed to switch brightness\n");
1429 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1432 struct acpi_video_bus
*video
;
1433 struct acpi_video_device
*video_device
;
1434 union acpi_object
*buffer
= NULL
;
1438 if (!device
|| !acpi_driver_data(device
))
1441 video
= acpi_driver_data(device
);
1443 for (i
= 0; i
< video
->attached_count
; i
++) {
1444 video_device
= video
->attached_array
[i
].bind_info
;
1450 if (!video_device
->cap
._DDC
)
1455 case ACPI_VIDEO_DISPLAY_CRT
:
1456 if (!video_device
->flags
.crt
)
1459 case ACPI_VIDEO_DISPLAY_TV
:
1460 if (!video_device
->flags
.tvout
)
1463 case ACPI_VIDEO_DISPLAY_DVI
:
1464 if (!video_device
->flags
.dvi
)
1467 case ACPI_VIDEO_DISPLAY_LCD
:
1468 if (!video_device
->flags
.lcd
)
1472 } else if (video_device
->device_id
!= device_id
) {
1476 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1478 if (ACPI_FAILURE(status
) || !buffer
||
1479 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1481 status
= acpi_video_device_EDID(video_device
, &buffer
,
1483 if (ACPI_FAILURE(status
) || !buffer
||
1484 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1489 *edid
= buffer
->buffer
.pointer
;
1495 EXPORT_SYMBOL(acpi_video_get_edid
);
1498 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1499 struct acpi_device
*device
)
1502 * There are systems where video module known to work fine regardless
1503 * of broken _DOD and ignoring returned value here doesn't cause
1506 acpi_video_device_enumerate(video
);
1508 return acpi_dev_for_each_child(device
, acpi_video_bus_get_one_device
, video
);
1511 /* acpi_video interface */
1514 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1515 * perform any automatic brightness change on receiving a notification.
1517 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1519 return acpi_video_bus_DOS(video
, 0,
1520 acpi_osi_is_win8() ? 1 : 0);
1523 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1525 return acpi_video_bus_DOS(video
, 0,
1526 acpi_osi_is_win8() ? 0 : 1);
1529 static void acpi_video_bus_notify(acpi_handle handle
, u32 event
, void *data
)
1531 struct acpi_device
*device
= data
;
1532 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1533 struct input_dev
*input
;
1536 if (!video
|| !video
->input
)
1539 input
= video
->input
;
1542 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1543 * most likely via hotkey. */
1544 keycode
= KEY_SWITCHVIDEOMODE
;
1547 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1549 acpi_video_device_enumerate(video
);
1550 acpi_video_device_rebind(video
);
1551 keycode
= KEY_SWITCHVIDEOMODE
;
1554 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1555 keycode
= KEY_SWITCHVIDEOMODE
;
1557 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1558 keycode
= KEY_VIDEO_NEXT
;
1560 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1561 keycode
= KEY_VIDEO_PREV
;
1565 acpi_handle_debug(device
->handle
, "Unsupported event [0x%x]\n",
1570 if (acpi_notifier_call_chain(device
, event
, 0))
1571 /* Something vetoed the keypress. */
1574 if (keycode
&& (report_key_events
& REPORT_OUTPUT_KEY_EVENTS
)) {
1575 input_report_key(input
, keycode
, 1);
1577 input_report_key(input
, keycode
, 0);
1582 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1585 if (!brightness_switch_enabled
)
1588 video_device
->switch_brightness_event
= event
;
1589 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1592 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1594 struct acpi_video_device
*video_device
= data
;
1595 struct acpi_device
*device
= NULL
;
1596 struct acpi_video_bus
*bus
;
1597 struct input_dev
*input
;
1603 device
= video_device
->dev
;
1604 bus
= video_device
->video
;
1607 if (hw_changes_brightness
> 0) {
1608 if (video_device
->backlight
)
1609 backlight_force_update(video_device
->backlight
,
1610 BACKLIGHT_UPDATE_HOTKEY
);
1611 acpi_notifier_call_chain(device
, event
, 0);
1616 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1617 brightness_switch_event(video_device
, event
);
1618 keycode
= KEY_BRIGHTNESS_CYCLE
;
1620 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1621 brightness_switch_event(video_device
, event
);
1622 keycode
= KEY_BRIGHTNESSUP
;
1624 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1625 brightness_switch_event(video_device
, event
);
1626 keycode
= KEY_BRIGHTNESSDOWN
;
1628 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1629 brightness_switch_event(video_device
, event
);
1630 keycode
= KEY_BRIGHTNESS_ZERO
;
1632 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1633 brightness_switch_event(video_device
, event
);
1634 keycode
= KEY_DISPLAY_OFF
;
1637 acpi_handle_debug(handle
, "Unsupported event [0x%x]\n", event
);
1642 may_report_brightness_keys
= true;
1644 acpi_notifier_call_chain(device
, event
, 0);
1646 if (keycode
&& (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
)) {
1647 input_report_key(input
, keycode
, 1);
1649 input_report_key(input
, keycode
, 0);
1654 static int acpi_video_resume(struct notifier_block
*nb
,
1655 unsigned long val
, void *ign
)
1657 struct acpi_video_bus
*video
;
1658 struct acpi_video_device
*video_device
;
1662 case PM_POST_HIBERNATION
:
1663 case PM_POST_SUSPEND
:
1664 case PM_POST_RESTORE
:
1665 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1667 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1669 for (i
= 0; i
< video
->attached_count
; i
++) {
1670 video_device
= video
->attached_array
[i
].bind_info
;
1671 if (video_device
&& video_device
->brightness
)
1672 acpi_video_device_lcd_set_level(video_device
,
1673 video_device
->brightness
->curr
);
1682 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1683 void **return_value
)
1685 struct acpi_device
*device
= context
;
1686 struct acpi_device
*sibling
;
1688 if (handle
== device
->handle
)
1689 return AE_CTRL_TERMINATE
;
1691 sibling
= acpi_fetch_acpi_dev(handle
);
1695 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1696 return AE_ALREADY_EXISTS
;
1701 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1703 struct backlight_properties props
;
1704 struct pci_dev
*pdev
;
1705 acpi_handle acpi_parent
;
1706 struct device
*parent
= NULL
;
1711 result
= acpi_video_init_brightness(device
);
1715 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1720 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1722 pdev
= acpi_get_pci_dev(acpi_parent
);
1724 parent
= &pdev
->dev
;
1728 memset(&props
, 0, sizeof(struct backlight_properties
));
1729 props
.type
= BACKLIGHT_FIRMWARE
;
1730 props
.max_brightness
=
1731 device
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
1732 device
->backlight
= backlight_device_register(name
,
1735 &acpi_backlight_ops
,
1738 if (IS_ERR(device
->backlight
)) {
1739 device
->backlight
= NULL
;
1744 * Save current brightness level in case we have to restore it
1745 * before acpi_video_device_lcd_set_level() is called next time.
1747 device
->backlight
->props
.brightness
=
1748 acpi_video_get_brightness(device
->backlight
);
1750 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1751 device
->dev
, &video_cooling_ops
);
1752 if (IS_ERR(device
->cooling_dev
)) {
1754 * Set cooling_dev to NULL so we don't crash trying to free it.
1755 * Also, why the hell we are returning early and not attempt to
1756 * register video output if cooling device registration failed?
1759 device
->cooling_dev
= NULL
;
1763 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1764 device
->cooling_dev
->id
);
1765 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1766 &device
->cooling_dev
->device
.kobj
,
1769 pr_info("sysfs link creation failed\n");
1771 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1772 &device
->dev
->dev
.kobj
, "device");
1774 pr_info("Reverse sysfs link creation failed\n");
1777 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1779 struct acpi_video_device
*dev
;
1780 union acpi_object
*levels
;
1782 mutex_lock(&video
->device_list_lock
);
1783 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1784 if (!acpi_video_device_lcd_query_levels(dev
->dev
->handle
, &levels
))
1787 mutex_unlock(&video
->device_list_lock
);
1790 static bool acpi_video_should_register_backlight(struct acpi_video_device
*dev
)
1793 * Do not create backlight device for video output
1794 * device that is not in the enumerated list.
1796 if (!acpi_video_device_in_dod(dev
)) {
1797 dev_dbg(&dev
->dev
->dev
, "not in _DOD list, ignore\n");
1802 return dev
->flags
.lcd
;
1806 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1808 struct acpi_video_device
*dev
;
1810 if (video
->backlight_registered
)
1813 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1816 mutex_lock(&video
->device_list_lock
);
1817 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1818 if (acpi_video_should_register_backlight(dev
))
1819 acpi_video_dev_register_backlight(dev
);
1821 mutex_unlock(&video
->device_list_lock
);
1823 video
->backlight_registered
= true;
1825 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1826 video
->pm_nb
.priority
= 0;
1827 return register_pm_notifier(&video
->pm_nb
);
1830 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1832 if (device
->backlight
) {
1833 backlight_device_unregister(device
->backlight
);
1834 device
->backlight
= NULL
;
1836 if (device
->brightness
) {
1837 kfree(device
->brightness
->levels
);
1838 kfree(device
->brightness
);
1839 device
->brightness
= NULL
;
1841 if (device
->cooling_dev
) {
1842 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1843 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1844 thermal_cooling_device_unregister(device
->cooling_dev
);
1845 device
->cooling_dev
= NULL
;
1849 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1851 struct acpi_video_device
*dev
;
1854 if (!video
->backlight_registered
)
1857 error
= unregister_pm_notifier(&video
->pm_nb
);
1859 mutex_lock(&video
->device_list_lock
);
1860 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1861 acpi_video_dev_unregister_backlight(dev
);
1862 mutex_unlock(&video
->device_list_lock
);
1864 video
->backlight_registered
= false;
1869 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1872 struct acpi_device
*adev
= device
->dev
;
1874 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1875 acpi_video_device_notify
, device
);
1876 if (ACPI_FAILURE(status
))
1877 dev_err(&adev
->dev
, "Error installing notify handler\n");
1879 device
->flags
.notify
= 1;
1882 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1884 struct input_dev
*input
;
1885 struct acpi_video_device
*dev
;
1888 video
->input
= input
= input_allocate_device();
1894 error
= acpi_video_bus_start_devices(video
);
1896 goto err_free_input
;
1898 snprintf(video
->phys
, sizeof(video
->phys
),
1899 "%s/video/input0", acpi_device_hid(video
->device
));
1901 input
->name
= acpi_device_name(video
->device
);
1902 input
->phys
= video
->phys
;
1903 input
->id
.bustype
= BUS_HOST
;
1904 input
->id
.product
= 0x06;
1905 input
->dev
.parent
= &video
->device
->dev
;
1906 input
->evbit
[0] = BIT(EV_KEY
);
1907 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1908 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1909 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1910 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1911 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1912 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1913 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1914 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1916 error
= input_register_device(input
);
1920 mutex_lock(&video
->device_list_lock
);
1921 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1922 acpi_video_dev_add_notify_handler(dev
);
1923 mutex_unlock(&video
->device_list_lock
);
1928 acpi_video_bus_stop_devices(video
);
1930 input_free_device(input
);
1931 video
->input
= NULL
;
1936 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1938 if (dev
->flags
.notify
) {
1939 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1940 acpi_video_device_notify
);
1941 dev
->flags
.notify
= 0;
1945 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1947 struct acpi_video_device
*dev
;
1949 mutex_lock(&video
->device_list_lock
);
1950 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1951 acpi_video_dev_remove_notify_handler(dev
);
1952 mutex_unlock(&video
->device_list_lock
);
1954 acpi_video_bus_stop_devices(video
);
1955 input_unregister_device(video
->input
);
1956 video
->input
= NULL
;
1959 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1961 struct acpi_video_device
*dev
, *next
;
1963 mutex_lock(&video
->device_list_lock
);
1964 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1965 list_del(&dev
->entry
);
1968 mutex_unlock(&video
->device_list_lock
);
1973 static int instance
;
1975 static int acpi_video_bus_add(struct acpi_device
*device
)
1977 struct acpi_video_bus
*video
;
1982 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1983 acpi_dev_parent(device
)->handle
, 1,
1984 acpi_video_bus_match
, NULL
,
1986 if (status
== AE_ALREADY_EXISTS
) {
1988 "Duplicate ACPI video bus devices for the"
1989 " same VGA controller, please try module "
1990 "parameter \"video.allow_duplicates=1\""
1991 "if the current driver doesn't work.\n");
1992 if (!allow_duplicates
)
1996 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
2000 /* a hack to fix the duplicate name "VID" problem on T61 */
2001 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
2003 device
->pnp
.bus_id
[3] = '0' + instance
;
2006 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2007 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
2009 device
->pnp
.bus_id
[3] = '0' + instance
;
2013 video
->device
= device
;
2014 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
2015 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
2016 device
->driver_data
= video
;
2018 acpi_video_bus_find_cap(video
);
2019 error
= acpi_video_bus_check(video
);
2021 goto err_free_video
;
2023 mutex_init(&video
->device_list_lock
);
2024 INIT_LIST_HEAD(&video
->video_device_list
);
2026 error
= acpi_video_bus_get_devices(video
, device
);
2031 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0
2032 * evaluated to have functional panel brightness control.
2034 acpi_device_fix_up_power_extended(device
);
2036 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2037 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
2038 video
->flags
.multihead
? "yes" : "no",
2039 video
->flags
.rom
? "yes" : "no",
2040 video
->flags
.post
? "yes" : "no");
2041 mutex_lock(&video_list_lock
);
2042 list_add_tail(&video
->entry
, &video_bus_head
);
2043 mutex_unlock(&video_list_lock
);
2046 * If backlight-type auto-detection is used then a native backlight may
2047 * show up later and this may change the result from video to native.
2048 * Therefor normally the userspace visible /sys/class/backlight device
2049 * gets registered separately by the GPU driver calling
2050 * acpi_video_register_backlight() when an internal panel is detected.
2051 * Register the backlight now when not using auto-detection, so that
2052 * when the kernel cmdline or DMI-quirks are used the backlight will
2053 * get registered even if acpi_video_register_backlight() is not called.
2055 acpi_video_run_bcl_for_osi(video
);
2056 if (__acpi_video_get_backlight_type(false, &auto_detect
) == acpi_backlight_video
&&
2058 acpi_video_bus_register_backlight(video
);
2060 error
= acpi_video_bus_add_notify_handler(video
);
2064 error
= acpi_dev_install_notify_handler(device
, ACPI_DEVICE_NOTIFY
,
2065 acpi_video_bus_notify
);
2072 acpi_video_bus_remove_notify_handler(video
);
2074 mutex_lock(&video_list_lock
);
2075 list_del(&video
->entry
);
2076 mutex_unlock(&video_list_lock
);
2077 acpi_video_bus_unregister_backlight(video
);
2079 acpi_video_bus_put_devices(video
);
2080 kfree(video
->attached_array
);
2083 device
->driver_data
= NULL
;
2088 static void acpi_video_bus_remove(struct acpi_device
*device
)
2090 struct acpi_video_bus
*video
= NULL
;
2093 if (!device
|| !acpi_driver_data(device
))
2096 video
= acpi_driver_data(device
);
2098 acpi_dev_remove_notify_handler(device
, ACPI_DEVICE_NOTIFY
,
2099 acpi_video_bus_notify
);
2101 mutex_lock(&video_list_lock
);
2102 list_del(&video
->entry
);
2103 mutex_unlock(&video_list_lock
);
2105 acpi_video_bus_remove_notify_handler(video
);
2106 acpi_video_bus_unregister_backlight(video
);
2107 acpi_video_bus_put_devices(video
);
2109 kfree(video
->attached_array
);
2113 static int __init
is_i740(struct pci_dev
*dev
)
2115 if (dev
->device
== 0x00D1)
2117 if (dev
->device
== 0x7000)
2122 static int __init
intel_opregion_present(void)
2125 struct pci_dev
*dev
= NULL
;
2128 for_each_pci_dev(dev
) {
2129 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2131 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2133 /* We don't want to poke around undefined i740 registers */
2136 pci_read_config_dword(dev
, 0xfc, &address
);
2144 /* Check if the chassis-type indicates there is no builtin LCD panel */
2145 static bool dmi_is_desktop(void)
2147 const char *chassis_type
;
2150 chassis_type
= dmi_get_system_info(DMI_CHASSIS_TYPE
);
2154 if (kstrtoul(chassis_type
, 10, &type
) != 0)
2158 case 0x03: /* Desktop */
2159 case 0x04: /* Low Profile Desktop */
2160 case 0x05: /* Pizza Box */
2161 case 0x06: /* Mini Tower */
2162 case 0x07: /* Tower */
2163 case 0x10: /* Lunch Box */
2164 case 0x11: /* Main Server Chassis */
2172 * We're seeing a lot of bogus backlight interfaces on newer machines
2173 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2174 * lcd flag fixes this, enable this by default on any machines which are:
2175 * 1. Win8 ready (where we also prefer the native backlight driver, so
2176 * normally the acpi_video code should not register there anyways); *and*
2177 * 2.1 Report a desktop/server DMI chassis-type, or
2178 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2181 static bool should_check_lcd_flag(void)
2183 if (!acpi_osi_is_win8())
2186 if (dmi_is_desktop())
2189 if (acpi_reduced_hardware())
2195 int acpi_video_register(void)
2199 mutex_lock(®ister_count_mutex
);
2200 if (register_count
) {
2202 * if the function of acpi_video_register is already called,
2203 * don't register the acpi_video_bus again and return no error.
2209 only_lcd
= should_check_lcd_flag();
2211 dmi_check_system(video_dmi_table
);
2213 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2218 * When the acpi_video_bus is loaded successfully, increase
2219 * the counter reference.
2224 mutex_unlock(®ister_count_mutex
);
2227 EXPORT_SYMBOL(acpi_video_register
);
2229 void acpi_video_unregister(void)
2231 mutex_lock(®ister_count_mutex
);
2232 if (register_count
) {
2233 acpi_bus_unregister_driver(&acpi_video_bus
);
2235 may_report_brightness_keys
= false;
2237 mutex_unlock(®ister_count_mutex
);
2239 EXPORT_SYMBOL(acpi_video_unregister
);
2241 void acpi_video_register_backlight(void)
2243 struct acpi_video_bus
*video
;
2245 mutex_lock(&video_list_lock
);
2246 list_for_each_entry(video
, &video_bus_head
, entry
)
2247 acpi_video_bus_register_backlight(video
);
2248 mutex_unlock(&video_list_lock
);
2250 EXPORT_SYMBOL(acpi_video_register_backlight
);
2252 bool acpi_video_handles_brightness_key_presses(void)
2254 return may_report_brightness_keys
&&
2255 (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
);
2257 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses
);
2260 * This is kind of nasty. Hardware using Intel chipsets may require
2261 * the video opregion code to be run first in order to initialise
2262 * state before any ACPI video calls are made. To handle this we defer
2263 * registration of the video class until the opregion code has run.
2266 static int __init
acpi_video_init(void)
2269 * Let the module load even if ACPI is disabled (e.g. due to
2270 * a broken BIOS) so that i915.ko can still be loaded on such
2271 * old systems without an AcpiOpRegion.
2273 * acpi_video_register() will report -ENODEV later as well due
2274 * to acpi_disabled when i915.ko tries to register itself afterwards.
2279 if (intel_opregion_present())
2282 return acpi_video_register();
2285 static void __exit
acpi_video_exit(void)
2287 acpi_video_unregister();
2290 module_init(acpi_video_init
);
2291 module_exit(acpi_video_exit
);