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");
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 int register_count
;
74 static DEFINE_MUTEX(register_count_mutex
);
75 static DEFINE_MUTEX(video_list_lock
);
76 static LIST_HEAD(video_bus_head
);
77 static int acpi_video_bus_add(struct acpi_device
*device
);
78 static int acpi_video_bus_remove(struct acpi_device
*device
);
79 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
80 void acpi_video_detect_exit(void);
83 * Indices in the _BCL method response: the first two items are special,
84 * the rest are all supported levels.
86 * See page 575 of the ACPI spec 3.0
88 enum acpi_video_level_idx
{
89 ACPI_VIDEO_AC_LEVEL
, /* level when machine has full power */
90 ACPI_VIDEO_BATTERY_LEVEL
, /* level when machine is on batteries */
91 ACPI_VIDEO_FIRST_LEVEL
, /* actual supported levels begin here */
94 static const struct acpi_device_id video_device_ids
[] = {
98 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
100 static struct acpi_driver acpi_video_bus
= {
102 .class = ACPI_VIDEO_CLASS
,
103 .ids
= video_device_ids
,
105 .add
= acpi_video_bus_add
,
106 .remove
= acpi_video_bus_remove
,
107 .notify
= acpi_video_bus_notify
,
111 struct acpi_video_bus_flags
{
112 u8 multihead
:1; /* can switch video heads */
113 u8 rom
:1; /* can retrieve a video rom */
114 u8 post
:1; /* can configure the head to */
118 struct acpi_video_bus_cap
{
119 u8 _DOS
:1; /* Enable/Disable output switching */
120 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
121 u8 _ROM
:1; /* Get ROM Data */
122 u8 _GPD
:1; /* Get POST Device */
123 u8 _SPD
:1; /* Set POST Device */
124 u8 _VPO
:1; /* Video POST Options */
128 struct acpi_video_device_attrib
{
129 u32 display_index
:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment
:4; /* This field differentiates the display type */
131 u32 display_type
:4; /* Describe the specific type in use */
132 u32 vendor_specific
:4; /* Chipset Vendor Specific */
133 u32 bios_can_detect
:1; /* BIOS can detect the device */
134 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
136 u32 pipe_id
:3; /* For VGA multiple-head devices. */
137 u32 reserved
:10; /* Must be 0 */
140 * The device ID might not actually follow the scheme described by this
141 * struct acpi_video_device_attrib. If it does, then this bit
142 * device_id_scheme is set; otherwise, other fields should be ignored.
144 * (but also see the global flag device_id_scheme)
146 u32 device_id_scheme
:1;
149 struct acpi_video_enumerated_device
{
152 struct acpi_video_device_attrib attrib
;
154 struct acpi_video_device
*bind_info
;
157 struct acpi_video_bus
{
158 struct acpi_device
*device
;
159 bool backlight_registered
;
161 struct acpi_video_enumerated_device
*attached_array
;
164 struct acpi_video_bus_cap cap
;
165 struct acpi_video_bus_flags flags
;
166 struct list_head video_device_list
;
167 struct mutex device_list_lock
; /* protects video_device_list */
168 struct list_head entry
;
169 struct input_dev
*input
;
170 char phys
[32]; /* for input device */
171 struct notifier_block pm_nb
;
174 struct acpi_video_device_flags
{
185 struct acpi_video_device_cap
{
186 u8 _ADR
:1; /* Return the unique ID */
187 u8 _BCL
:1; /* Query list of brightness control levels supported */
188 u8 _BCM
:1; /* Set the brightness level */
189 u8 _BQC
:1; /* Get current brightness level */
190 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC
:1; /* Return the EDID for this device */
194 struct acpi_video_device
{
195 unsigned long device_id
;
196 struct acpi_video_device_flags flags
;
197 struct acpi_video_device_cap cap
;
198 struct list_head entry
;
199 struct delayed_work switch_brightness_work
;
200 int switch_brightness_event
;
201 struct acpi_video_bus
*video
;
202 struct acpi_device
*dev
;
203 struct acpi_video_device_brightness
*brightness
;
204 struct backlight_device
*backlight
;
205 struct thermal_cooling_device
*cooling_dev
;
208 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
209 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
210 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
211 struct acpi_video_device
*device
);
212 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
213 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
215 static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device
*device
,
217 unsigned long long *level
, bool raw
);
218 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
219 u32 level_current
, u32 event
);
220 static void acpi_video_switch_brightness(struct work_struct
*work
);
222 /* backlight device sysfs support */
223 static int acpi_video_get_brightness(struct backlight_device
*bd
)
225 unsigned long long cur_level
;
227 struct acpi_video_device
*vd
= bl_get_data(bd
);
229 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
231 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< vd
->brightness
->count
; i
++) {
232 if (vd
->brightness
->levels
[i
] == cur_level
)
233 return i
- ACPI_VIDEO_FIRST_LEVEL
;
238 static int acpi_video_set_brightness(struct backlight_device
*bd
)
240 int request_level
= bd
->props
.brightness
+ ACPI_VIDEO_FIRST_LEVEL
;
241 struct acpi_video_device
*vd
= bl_get_data(bd
);
243 cancel_delayed_work(&vd
->switch_brightness_work
);
244 return acpi_video_device_lcd_set_level(vd
,
245 vd
->brightness
->levels
[request_level
]);
248 static const struct backlight_ops acpi_backlight_ops
= {
249 .get_brightness
= acpi_video_get_brightness
,
250 .update_status
= acpi_video_set_brightness
,
253 /* thermal cooling device callbacks */
254 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
,
255 unsigned long *state
)
257 struct acpi_device
*device
= cooling_dev
->devdata
;
258 struct acpi_video_device
*video
= acpi_driver_data(device
);
260 *state
= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
264 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
,
265 unsigned long *state
)
267 struct acpi_device
*device
= cooling_dev
->devdata
;
268 struct acpi_video_device
*video
= acpi_driver_data(device
);
269 unsigned long long level
;
272 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
274 for (offset
= ACPI_VIDEO_FIRST_LEVEL
; offset
< video
->brightness
->count
;
276 if (level
== video
->brightness
->levels
[offset
]) {
277 *state
= video
->brightness
->count
- offset
- 1;
285 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
287 struct acpi_device
*device
= cooling_dev
->devdata
;
288 struct acpi_video_device
*video
= acpi_driver_data(device
);
291 if (state
>= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
)
294 state
= video
->brightness
->count
- state
;
295 level
= video
->brightness
->levels
[state
- 1];
296 return acpi_video_device_lcd_set_level(video
, level
);
299 static const struct thermal_cooling_device_ops video_cooling_ops
= {
300 .get_max_state
= video_get_max_state
,
301 .get_cur_state
= video_get_cur_state
,
302 .set_cur_state
= video_set_cur_state
,
306 * --------------------------------------------------------------------------
308 * --------------------------------------------------------------------------
312 acpi_video_device_lcd_query_levels(acpi_handle handle
,
313 union acpi_object
**levels
)
316 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
317 union acpi_object
*obj
;
322 status
= acpi_evaluate_object(handle
, "_BCL", NULL
, &buffer
);
323 if (!ACPI_SUCCESS(status
))
325 obj
= (union acpi_object
*)buffer
.pointer
;
326 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
327 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
337 kfree(buffer
.pointer
);
343 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
348 status
= acpi_execute_simple_method(device
->dev
->handle
,
350 if (ACPI_FAILURE(status
)) {
351 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
355 device
->brightness
->curr
= level
;
356 for (state
= ACPI_VIDEO_FIRST_LEVEL
; state
< device
->brightness
->count
;
358 if (level
== device
->brightness
->levels
[state
]) {
359 if (device
->backlight
)
360 device
->backlight
->props
.brightness
=
361 state
- ACPI_VIDEO_FIRST_LEVEL
;
365 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
370 * For some buggy _BQC methods, we need to add a constant value to
371 * the _BQC return value to get the actual current brightness level
374 static int bqc_offset_aml_bug_workaround
;
375 static int video_set_bqc_offset(const struct dmi_system_id
*d
)
377 bqc_offset_aml_bug_workaround
= 9;
381 static int video_disable_backlight_sysfs_if(
382 const struct dmi_system_id
*d
)
384 if (disable_backlight_sysfs_if
== -1)
385 disable_backlight_sysfs_if
= 1;
389 static int video_set_device_id_scheme(const struct dmi_system_id
*d
)
391 device_id_scheme
= true;
395 static int video_enable_only_lcd(const struct dmi_system_id
*d
)
401 static int video_set_report_key_events(const struct dmi_system_id
*id
)
403 if (report_key_events
== -1)
404 report_key_events
= (uintptr_t)id
->driver_data
;
408 static const struct dmi_system_id video_dmi_table
[] = {
410 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
413 .callback
= video_set_bqc_offset
,
414 .ident
= "Acer Aspire 5720",
416 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
417 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
421 .callback
= video_set_bqc_offset
,
422 .ident
= "Acer Aspire 5710Z",
424 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
429 .callback
= video_set_bqc_offset
,
430 .ident
= "eMachines E510",
432 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
433 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
437 .callback
= video_set_bqc_offset
,
438 .ident
= "Acer Aspire 5315",
440 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
441 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
445 .callback
= video_set_bqc_offset
,
446 .ident
= "Acer Aspire 7720",
448 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
449 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
454 * Some machines have a broken acpi-video interface for brightness
455 * control, but still need an acpi_video_device_lcd_set_level() call
456 * on resume to turn the backlight power on. We Enable backlight
457 * control on these systems, but do not register a backlight sysfs
458 * as brightness control does not work.
461 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
462 .callback
= video_disable_backlight_sysfs_if
,
463 .ident
= "Toshiba Portege R700",
465 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
466 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R700"),
470 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
471 .callback
= video_disable_backlight_sysfs_if
,
472 .ident
= "Toshiba Portege R830",
474 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
475 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R830"),
479 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
480 .callback
= video_disable_backlight_sysfs_if
,
481 .ident
= "Toshiba Satellite R830",
483 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
484 DMI_MATCH(DMI_PRODUCT_NAME
, "SATELLITE R830"),
488 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
489 * but the IDs actually follow the Device ID Scheme.
492 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
493 .callback
= video_set_device_id_scheme
,
494 .ident
= "ESPRIMO Mobile M9410",
496 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
497 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
501 * Some machines have multiple video output devices, but only the one
502 * that is the type of LCD can do the backlight control so we should not
503 * register backlight interface for other video output devices.
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback
= video_enable_only_lcd
,
508 .ident
= "ESPRIMO Mobile M9410",
510 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
515 * Some machines report wrong key events on the acpi-bus, suppress
516 * key event reporting on these. Note this is only intended to work
517 * around events which are plain wrong. In some cases we get double
518 * events, in this case acpi-video is considered the canonical source
519 * and the events from the other source should be filtered. E.g.
520 * by calling acpi_video_handles_brightness_key_presses() from the
521 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
524 .callback
= video_set_report_key_events
,
525 .driver_data
= (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS
),
526 .ident
= "Dell Vostro V131",
528 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
529 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro V131"),
535 static unsigned long long
536 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
537 unsigned long long bqc_value
)
539 unsigned long long level
;
541 if (device
->brightness
->flags
._BQC_use_index
) {
543 * _BQC returns an index that doesn't account for the first 2
544 * items with special meaning (see enum acpi_video_level_idx),
545 * so we need to compensate for that by offsetting ourselves
547 if (device
->brightness
->flags
._BCL_reversed
)
548 bqc_value
= device
->brightness
->count
-
549 ACPI_VIDEO_FIRST_LEVEL
- 1 - bqc_value
;
551 level
= device
->brightness
->levels
[bqc_value
+
552 ACPI_VIDEO_FIRST_LEVEL
];
557 level
+= bqc_offset_aml_bug_workaround
;
563 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
564 unsigned long long *level
, bool raw
)
566 acpi_status status
= AE_OK
;
569 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
570 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
572 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
574 if (ACPI_SUCCESS(status
)) {
577 * Caller has indicated he wants the raw
578 * value returned by _BQC, so don't furtherly
579 * mess with the value.
584 *level
= acpi_video_bqc_value_to_level(device
, *level
);
586 for (i
= ACPI_VIDEO_FIRST_LEVEL
;
587 i
< device
->brightness
->count
; i
++)
588 if (device
->brightness
->levels
[i
] == *level
) {
589 device
->brightness
->curr
= *level
;
593 * BQC returned an invalid level.
596 ACPI_WARNING((AE_INFO
,
597 "%s returned an invalid level",
599 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
603 * should we return an error or ignore this failure?
604 * dev->brightness->curr is a cached value which stores
605 * the correct current backlight level in most cases.
606 * ACPI video backlight still works w/ buggy _BQC.
607 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
609 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
610 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
614 *level
= device
->brightness
->curr
;
619 acpi_video_device_EDID(struct acpi_video_device
*device
,
620 union acpi_object
**edid
, ssize_t length
)
623 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
624 union acpi_object
*obj
;
625 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
626 struct acpi_object_list args
= { 1, &arg0
};
634 arg0
.integer
.value
= 1;
635 else if (length
== 256)
636 arg0
.integer
.value
= 2;
640 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
641 if (ACPI_FAILURE(status
))
644 obj
= buffer
.pointer
;
646 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
649 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
661 * video : video bus device pointer
663 * 0. The system BIOS should NOT automatically switch(toggle)
664 * the active display output.
665 * 1. The system BIOS should automatically switch (toggle) the
666 * active display output. No switch event.
667 * 2. The _DGS value should be locked.
668 * 3. The system BIOS should not automatically switch (toggle) the
669 * active display output, but instead generate the display switch
672 * 0. The system BIOS should automatically control the brightness level
673 * of the LCD when the power changes from AC to DC
674 * 1. The system BIOS should NOT automatically control the brightness
675 * level of the LCD when the power changes from AC to DC.
681 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
685 if (!video
->cap
._DOS
)
688 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
690 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
691 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
692 (lcd_flag
<< 2) | bios_flag
);
693 if (ACPI_FAILURE(status
))
700 * Simple comparison function used to sort backlight levels.
704 acpi_video_cmp_level(const void *a
, const void *b
)
706 return *(int *)a
- *(int *)b
;
710 * Decides if _BQC/_BCQ for this system is usable
712 * We do this by changing the level first and then read out the current
713 * brightness level, if the value does not match, find out if it is using
714 * index. If not, clear the _BQC/_BCQ capability.
716 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
717 int max_level
, int current_level
)
719 struct acpi_video_device_brightness
*br
= device
->brightness
;
721 unsigned long long level
;
724 /* don't mess with existing known broken systems */
725 if (bqc_offset_aml_bug_workaround
)
729 * Some systems always report current brightness level as maximum
730 * through _BQC, we need to test another value for them. However,
731 * there is a subtlety:
733 * If the _BCL package ordering is descending, the first level
734 * (br->levels[2]) is likely to be 0, and if the number of levels
735 * matches the number of steps, we might confuse a returned level to
740 * current_level = max_level = 100
742 * returned level = 100
744 * In this case 100 means the level, not the index, and _BCM failed.
745 * Still, if the _BCL package ordering is descending, the index of
746 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
748 * This causes all _BQC calls to return bogus values causing weird
749 * behavior from the user's perspective. For example:
751 * xbacklight -set 10; xbacklight -set 20;
753 * would flash to 90% and then slowly down to the desired level (20).
755 * The solution is simple; test anything other than the first level
758 test_level
= current_level
== max_level
759 ? br
->levels
[ACPI_VIDEO_FIRST_LEVEL
+ 1]
762 result
= acpi_video_device_lcd_set_level(device
, test_level
);
766 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
770 if (level
!= test_level
) {
771 /* buggy _BQC found, need to find out if it uses index */
772 if (level
< br
->count
) {
773 if (br
->flags
._BCL_reversed
)
774 level
= br
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1 - level
;
775 if (br
->levels
[level
+ ACPI_VIDEO_FIRST_LEVEL
] == test_level
)
776 br
->flags
._BQC_use_index
= 1;
779 if (!br
->flags
._BQC_use_index
)
780 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
786 int acpi_video_get_levels(struct acpi_device
*device
,
787 struct acpi_video_device_brightness
**dev_br
,
790 union acpi_object
*obj
= NULL
;
791 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
792 union acpi_object
*o
;
793 struct acpi_video_device_brightness
*br
= NULL
;
797 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
->handle
,
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
800 "LCD brightness level\n"));
805 if (obj
->package
.count
< ACPI_VIDEO_FIRST_LEVEL
) {
810 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
812 printk(KERN_ERR
"can't allocate memory\n");
818 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
819 * in order to account for buggy BIOS which don't export the first two
820 * special levels (see below)
822 br
->levels
= kmalloc_array(obj
->package
.count
+ ACPI_VIDEO_FIRST_LEVEL
,
830 for (i
= 0; i
< obj
->package
.count
; i
++) {
831 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
832 if (o
->type
!= ACPI_TYPE_INTEGER
) {
833 printk(KERN_ERR PREFIX
"Invalid data\n");
836 value
= (u32
) o
->integer
.value
;
837 /* Skip duplicate entries */
838 if (count
> ACPI_VIDEO_FIRST_LEVEL
839 && br
->levels
[count
- 1] == value
)
842 br
->levels
[count
] = value
;
844 if (br
->levels
[count
] > max_level
)
845 max_level
= br
->levels
[count
];
850 * some buggy BIOS don't export the levels
851 * when machine is on AC/Battery in _BCL package.
852 * In this case, the first two elements in _BCL packages
853 * are also supported brightness levels that OS should take care of.
855 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< count
; i
++) {
856 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_AC_LEVEL
])
858 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_BATTERY_LEVEL
])
862 if (level_ac_battery
< ACPI_VIDEO_FIRST_LEVEL
) {
863 level_ac_battery
= ACPI_VIDEO_FIRST_LEVEL
- level_ac_battery
;
864 br
->flags
._BCL_no_ac_battery_levels
= 1;
865 for (i
= (count
- 1 + level_ac_battery
);
866 i
>= ACPI_VIDEO_FIRST_LEVEL
; i
--)
867 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
868 count
+= level_ac_battery
;
869 } else if (level_ac_battery
> ACPI_VIDEO_FIRST_LEVEL
)
870 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
872 /* Check if the _BCL package is in a reversed order */
873 if (max_level
== br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]) {
874 br
->flags
._BCL_reversed
= 1;
875 sort(&br
->levels
[ACPI_VIDEO_FIRST_LEVEL
],
876 count
- ACPI_VIDEO_FIRST_LEVEL
,
877 sizeof(br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]),
878 acpi_video_cmp_level
, NULL
);
879 } else if (max_level
!= br
->levels
[count
- 1])
881 "Found unordered _BCL package"));
886 *pmax_level
= max_level
;
895 EXPORT_SYMBOL(acpi_video_get_levels
);
899 * device : video output device (LCD, CRT, ..)
902 * Maximum brightness level
904 * Allocate and initialize device->brightness.
908 acpi_video_init_brightness(struct acpi_video_device
*device
)
910 int i
, max_level
= 0;
911 unsigned long long level
, level_old
;
912 struct acpi_video_device_brightness
*br
= NULL
;
913 int result
= -EINVAL
;
915 result
= acpi_video_get_levels(device
->dev
, &br
, &max_level
);
918 device
->brightness
= br
;
920 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
921 br
->curr
= level
= max_level
;
923 if (!device
->cap
._BQC
)
926 result
= acpi_video_device_lcd_get_level_current(device
,
929 goto out_free_levels
;
931 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
933 goto out_free_levels
;
935 * cap._BQC may get cleared due to _BQC is found to be broken
936 * in acpi_video_bqc_quirk, so check again here.
938 if (!device
->cap
._BQC
)
941 level
= acpi_video_bqc_value_to_level(device
, level_old
);
943 * On some buggy laptops, _BQC returns an uninitialized
944 * value when invoked for the first time, i.e.
945 * level_old is invalid (no matter whether it's a level
946 * or an index). Set the backlight to max_level in this case.
948 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< br
->count
; i
++)
949 if (level
== br
->levels
[i
])
951 if (i
== br
->count
|| !level
)
955 result
= acpi_video_device_lcd_set_level(device
, level
);
957 goto out_free_levels
;
959 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
960 "found %d brightness levels\n",
961 br
->count
- ACPI_VIDEO_FIRST_LEVEL
));
967 device
->brightness
= NULL
;
973 * device : video output device (LCD, CRT, ..)
978 * Find out all required AML methods defined under the output
982 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
984 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
985 device
->cap
._ADR
= 1;
986 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
987 device
->cap
._BCL
= 1;
988 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
989 device
->cap
._BCM
= 1;
990 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
991 device
->cap
._BQC
= 1;
992 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
993 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
994 device
->cap
._BCQ
= 1;
997 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
998 device
->cap
._DDC
= 1;
1003 * device : video output device (VGA)
1008 * Find out all required AML methods defined under the video bus device.
1011 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
1013 if (acpi_has_method(video
->device
->handle
, "_DOS"))
1014 video
->cap
._DOS
= 1;
1015 if (acpi_has_method(video
->device
->handle
, "_DOD"))
1016 video
->cap
._DOD
= 1;
1017 if (acpi_has_method(video
->device
->handle
, "_ROM"))
1018 video
->cap
._ROM
= 1;
1019 if (acpi_has_method(video
->device
->handle
, "_GPD"))
1020 video
->cap
._GPD
= 1;
1021 if (acpi_has_method(video
->device
->handle
, "_SPD"))
1022 video
->cap
._SPD
= 1;
1023 if (acpi_has_method(video
->device
->handle
, "_VPO"))
1024 video
->cap
._VPO
= 1;
1028 * Check whether the video bus device has required AML method to
1029 * support the desired features
1032 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
1034 acpi_status status
= -ENOENT
;
1035 struct pci_dev
*dev
;
1040 dev
= acpi_get_pci_dev(video
->device
->handle
);
1046 * Since there is no HID, CID and so on for VGA driver, we have
1047 * to check well known required nodes.
1050 /* Does this device support video switching? */
1051 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1052 if (!video
->cap
._DOS
) {
1053 printk(KERN_WARNING FW_BUG
1054 "ACPI(%s) defines _DOD but not _DOS\n",
1055 acpi_device_bid(video
->device
));
1057 video
->flags
.multihead
= 1;
1061 /* Does this device support retrieving a video ROM? */
1062 if (video
->cap
._ROM
) {
1063 video
->flags
.rom
= 1;
1067 /* Does this device support configuring which video device to POST? */
1068 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1069 video
->flags
.post
= 1;
1077 * --------------------------------------------------------------------------
1079 * --------------------------------------------------------------------------
1082 /* device interface */
1083 static struct acpi_video_device_attrib
*
1084 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1086 struct acpi_video_enumerated_device
*ids
;
1089 for (i
= 0; i
< video
->attached_count
; i
++) {
1090 ids
= &video
->attached_array
[i
];
1091 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1092 return &ids
->value
.attrib
;
1099 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1100 unsigned long device_id
)
1102 struct acpi_video_enumerated_device
*ids
;
1105 for (i
= 0; i
< video
->attached_count
; i
++) {
1106 ids
= &video
->attached_array
[i
];
1107 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1108 return ids
->value
.int_val
;
1115 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1116 struct acpi_video_bus
*video
)
1118 unsigned long long device_id
;
1119 int status
, device_type
;
1120 struct acpi_video_device
*data
;
1121 struct acpi_video_device_attrib
*attribute
;
1124 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1125 /* Some device omits _ADR, we skip them instead of fail */
1126 if (ACPI_FAILURE(status
))
1129 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1133 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1134 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1135 device
->driver_data
= data
;
1137 data
->device_id
= device_id
;
1138 data
->video
= video
;
1140 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1141 acpi_video_switch_brightness
);
1143 attribute
= acpi_video_get_device_attr(video
, device_id
);
1145 if (attribute
&& (attribute
->device_id_scheme
|| device_id_scheme
)) {
1146 switch (attribute
->display_type
) {
1147 case ACPI_VIDEO_DISPLAY_CRT
:
1148 data
->flags
.crt
= 1;
1150 case ACPI_VIDEO_DISPLAY_TV
:
1151 data
->flags
.tvout
= 1;
1153 case ACPI_VIDEO_DISPLAY_DVI
:
1154 data
->flags
.dvi
= 1;
1156 case ACPI_VIDEO_DISPLAY_LCD
:
1157 data
->flags
.lcd
= 1;
1160 data
->flags
.unknown
= 1;
1163 if (attribute
->bios_can_detect
)
1164 data
->flags
.bios
= 1;
1166 /* Check for legacy IDs */
1167 device_type
= acpi_video_get_device_type(video
, device_id
);
1168 /* Ignore bits 16 and 18-20 */
1169 switch (device_type
& 0xffe2ffff) {
1170 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1171 data
->flags
.crt
= 1;
1173 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1174 data
->flags
.lcd
= 1;
1176 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1177 data
->flags
.tvout
= 1;
1180 data
->flags
.unknown
= 1;
1184 acpi_video_device_bind(video
, data
);
1185 acpi_video_device_find_cap(data
);
1187 mutex_lock(&video
->device_list_lock
);
1188 list_add_tail(&data
->entry
, &video
->video_device_list
);
1189 mutex_unlock(&video
->device_list_lock
);
1196 * video : video bus device
1201 * Enumerate the video device list of the video bus,
1202 * bind the ids with the corresponding video devices
1203 * under the video bus.
1206 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1208 struct acpi_video_device
*dev
;
1210 mutex_lock(&video
->device_list_lock
);
1212 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1213 acpi_video_device_bind(video
, dev
);
1215 mutex_unlock(&video
->device_list_lock
);
1220 * video : video bus device
1221 * device : video output device under the video
1227 * Bind the ids with the corresponding video devices
1228 * under the video bus.
1232 acpi_video_device_bind(struct acpi_video_bus
*video
,
1233 struct acpi_video_device
*device
)
1235 struct acpi_video_enumerated_device
*ids
;
1238 for (i
= 0; i
< video
->attached_count
; i
++) {
1239 ids
= &video
->attached_array
[i
];
1240 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1241 ids
->bind_info
= device
;
1242 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1247 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1249 struct acpi_video_bus
*video
= device
->video
;
1253 * If we have a broken _DOD or we have more than 8 output devices
1254 * under the graphics controller node that we can't proper deal with
1255 * in the operation region code currently, no need to test.
1257 if (!video
->attached_count
|| video
->child_count
> 8)
1260 for (i
= 0; i
< video
->attached_count
; i
++) {
1261 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1262 (device
->device_id
& 0xfff))
1271 * video : video bus device
1276 * Call _DOD to enumerate all devices attached to display adapter
1280 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1285 struct acpi_video_enumerated_device
*active_list
;
1286 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1287 union acpi_object
*dod
= NULL
;
1288 union acpi_object
*obj
;
1290 if (!video
->cap
._DOD
)
1291 return AE_NOT_EXIST
;
1293 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1294 if (!ACPI_SUCCESS(status
)) {
1295 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1299 dod
= buffer
.pointer
;
1300 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1301 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1306 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1307 dod
->package
.count
));
1309 active_list
= kcalloc(1 + dod
->package
.count
,
1310 sizeof(struct acpi_video_enumerated_device
),
1318 for (i
= 0; i
< dod
->package
.count
; i
++) {
1319 obj
= &dod
->package
.elements
[i
];
1321 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1322 printk(KERN_ERR PREFIX
1323 "Invalid _DOD data in element %d\n", i
);
1327 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1328 active_list
[count
].bind_info
= NULL
;
1329 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1330 (int)obj
->integer
.value
));
1334 kfree(video
->attached_array
);
1336 video
->attached_array
= active_list
;
1337 video
->attached_count
= count
;
1340 kfree(buffer
.pointer
);
1345 acpi_video_get_next_level(struct acpi_video_device
*device
,
1346 u32 level_current
, u32 event
)
1348 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1349 max
= max_below
= 0;
1350 min
= min_above
= 255;
1351 /* Find closest level to level_current */
1352 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1353 l
= device
->brightness
->levels
[i
];
1354 if (abs(l
- level_current
) < abs(delta
)) {
1355 delta
= l
- level_current
;
1360 /* Ajust level_current to closest available level */
1361 level_current
+= delta
;
1362 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1363 l
= device
->brightness
->levels
[i
];
1368 if (l
< min_above
&& l
> level_current
)
1370 if (l
> max_below
&& l
< level_current
)
1375 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1376 return (level_current
< max
) ? min_above
: min
;
1377 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1378 return (level_current
< max
) ? min_above
: max
;
1379 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1380 return (level_current
> min
) ? max_below
: min
;
1381 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1382 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1385 return level_current
;
1390 acpi_video_switch_brightness(struct work_struct
*work
)
1392 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1393 struct acpi_video_device
, switch_brightness_work
);
1394 unsigned long long level_current
, level_next
;
1395 int event
= device
->switch_brightness_event
;
1396 int result
= -EINVAL
;
1398 /* no warning message if acpi_backlight=vendor or a quirk is used */
1399 if (!device
->backlight
)
1402 if (!device
->brightness
)
1405 result
= acpi_video_device_lcd_get_level_current(device
,
1411 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1413 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1416 backlight_force_update(device
->backlight
,
1417 BACKLIGHT_UPDATE_HOTKEY
);
1421 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1424 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1427 struct acpi_video_bus
*video
;
1428 struct acpi_video_device
*video_device
;
1429 union acpi_object
*buffer
= NULL
;
1433 if (!device
|| !acpi_driver_data(device
))
1436 video
= acpi_driver_data(device
);
1438 for (i
= 0; i
< video
->attached_count
; i
++) {
1439 video_device
= video
->attached_array
[i
].bind_info
;
1445 if (!video_device
->cap
._DDC
)
1450 case ACPI_VIDEO_DISPLAY_CRT
:
1451 if (!video_device
->flags
.crt
)
1454 case ACPI_VIDEO_DISPLAY_TV
:
1455 if (!video_device
->flags
.tvout
)
1458 case ACPI_VIDEO_DISPLAY_DVI
:
1459 if (!video_device
->flags
.dvi
)
1462 case ACPI_VIDEO_DISPLAY_LCD
:
1463 if (!video_device
->flags
.lcd
)
1467 } else if (video_device
->device_id
!= device_id
) {
1471 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1473 if (ACPI_FAILURE(status
) || !buffer
||
1474 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1476 status
= acpi_video_device_EDID(video_device
, &buffer
,
1478 if (ACPI_FAILURE(status
) || !buffer
||
1479 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1484 *edid
= buffer
->buffer
.pointer
;
1490 EXPORT_SYMBOL(acpi_video_get_edid
);
1493 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1494 struct acpi_device
*device
)
1497 struct acpi_device
*dev
;
1500 * There are systems where video module known to work fine regardless
1501 * of broken _DOD and ignoring returned value here doesn't cause
1504 acpi_video_device_enumerate(video
);
1506 list_for_each_entry(dev
, &device
->children
, node
) {
1508 status
= acpi_video_bus_get_one_device(dev
, video
);
1510 dev_err(&dev
->dev
, "Can't attach device\n");
1513 video
->child_count
++;
1518 /* acpi_video interface */
1521 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1522 * preform any automatic brightness change on receiving a notification.
1524 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1526 return acpi_video_bus_DOS(video
, 0,
1527 acpi_osi_is_win8() ? 1 : 0);
1530 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1532 return acpi_video_bus_DOS(video
, 0,
1533 acpi_osi_is_win8() ? 0 : 1);
1536 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1538 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1539 struct input_dev
*input
;
1542 if (!video
|| !video
->input
)
1545 input
= video
->input
;
1548 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1549 * most likely via hotkey. */
1550 keycode
= KEY_SWITCHVIDEOMODE
;
1553 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1555 acpi_video_device_enumerate(video
);
1556 acpi_video_device_rebind(video
);
1557 keycode
= KEY_SWITCHVIDEOMODE
;
1560 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1561 keycode
= KEY_SWITCHVIDEOMODE
;
1563 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1564 keycode
= KEY_VIDEO_NEXT
;
1566 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1567 keycode
= KEY_VIDEO_PREV
;
1571 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1572 "Unsupported event [0x%x]\n", event
));
1576 if (acpi_notifier_call_chain(device
, event
, 0))
1577 /* Something vetoed the keypress. */
1580 if (keycode
&& (report_key_events
& REPORT_OUTPUT_KEY_EVENTS
)) {
1581 input_report_key(input
, keycode
, 1);
1583 input_report_key(input
, keycode
, 0);
1590 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1593 if (!brightness_switch_enabled
)
1596 video_device
->switch_brightness_event
= event
;
1597 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1600 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1602 struct acpi_video_device
*video_device
= data
;
1603 struct acpi_device
*device
= NULL
;
1604 struct acpi_video_bus
*bus
;
1605 struct input_dev
*input
;
1611 device
= video_device
->dev
;
1612 bus
= video_device
->video
;
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_DEBUG_PRINT((ACPI_DB_INFO
,
1638 "Unsupported event [0x%x]\n", event
));
1642 acpi_notifier_call_chain(device
, event
, 0);
1644 if (keycode
&& (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
)) {
1645 input_report_key(input
, keycode
, 1);
1647 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_HIBERNATION_PREPARE
:
1663 case PM_SUSPEND_PREPARE
:
1664 case PM_RESTORE_PREPARE
:
1668 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1670 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1672 for (i
= 0; i
< video
->attached_count
; i
++) {
1673 video_device
= video
->attached_array
[i
].bind_info
;
1674 if (video_device
&& video_device
->brightness
)
1675 acpi_video_device_lcd_set_level(video_device
,
1676 video_device
->brightness
->curr
);
1683 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1684 void **return_value
)
1686 struct acpi_device
*device
= context
;
1687 struct acpi_device
*sibling
;
1690 if (handle
== device
->handle
)
1691 return AE_CTRL_TERMINATE
;
1693 result
= acpi_bus_get_device(handle
, &sibling
);
1697 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1698 return AE_ALREADY_EXISTS
;
1703 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1705 struct backlight_properties props
;
1706 struct pci_dev
*pdev
;
1707 acpi_handle acpi_parent
;
1708 struct device
*parent
= NULL
;
1713 result
= acpi_video_init_brightness(device
);
1717 if (disable_backlight_sysfs_if
> 0)
1720 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1725 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1727 pdev
= acpi_get_pci_dev(acpi_parent
);
1729 parent
= &pdev
->dev
;
1733 memset(&props
, 0, sizeof(struct backlight_properties
));
1734 props
.type
= BACKLIGHT_FIRMWARE
;
1735 props
.max_brightness
=
1736 device
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
1737 device
->backlight
= backlight_device_register(name
,
1740 &acpi_backlight_ops
,
1743 if (IS_ERR(device
->backlight
)) {
1744 device
->backlight
= NULL
;
1749 * Save current brightness level in case we have to restore it
1750 * before acpi_video_device_lcd_set_level() is called next time.
1752 device
->backlight
->props
.brightness
=
1753 acpi_video_get_brightness(device
->backlight
);
1755 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1756 device
->dev
, &video_cooling_ops
);
1757 if (IS_ERR(device
->cooling_dev
)) {
1759 * Set cooling_dev to NULL so we don't crash trying to free it.
1760 * Also, why the hell we are returning early and not attempt to
1761 * register video output if cooling device registration failed?
1764 device
->cooling_dev
= NULL
;
1768 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1769 device
->cooling_dev
->id
);
1770 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1771 &device
->cooling_dev
->device
.kobj
,
1774 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1775 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1776 &device
->dev
->dev
.kobj
, "device");
1778 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1781 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1783 struct acpi_video_device
*dev
;
1784 union acpi_object
*levels
;
1786 mutex_lock(&video
->device_list_lock
);
1787 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1788 if (!acpi_video_device_lcd_query_levels(dev
->dev
->handle
, &levels
))
1791 mutex_unlock(&video
->device_list_lock
);
1794 static bool acpi_video_should_register_backlight(struct acpi_video_device
*dev
)
1797 * Do not create backlight device for video output
1798 * device that is not in the enumerated list.
1800 if (!acpi_video_device_in_dod(dev
)) {
1801 dev_dbg(&dev
->dev
->dev
, "not in _DOD list, ignore\n");
1806 return dev
->flags
.lcd
;
1810 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1812 struct acpi_video_device
*dev
;
1814 if (video
->backlight_registered
)
1817 acpi_video_run_bcl_for_osi(video
);
1819 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1822 mutex_lock(&video
->device_list_lock
);
1823 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1824 if (acpi_video_should_register_backlight(dev
))
1825 acpi_video_dev_register_backlight(dev
);
1827 mutex_unlock(&video
->device_list_lock
);
1829 video
->backlight_registered
= true;
1831 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1832 video
->pm_nb
.priority
= 0;
1833 return register_pm_notifier(&video
->pm_nb
);
1836 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1838 if (device
->backlight
) {
1839 backlight_device_unregister(device
->backlight
);
1840 device
->backlight
= NULL
;
1842 if (device
->brightness
) {
1843 kfree(device
->brightness
->levels
);
1844 kfree(device
->brightness
);
1845 device
->brightness
= NULL
;
1847 if (device
->cooling_dev
) {
1848 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1849 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1850 thermal_cooling_device_unregister(device
->cooling_dev
);
1851 device
->cooling_dev
= NULL
;
1855 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1857 struct acpi_video_device
*dev
;
1860 if (!video
->backlight_registered
)
1863 error
= unregister_pm_notifier(&video
->pm_nb
);
1865 mutex_lock(&video
->device_list_lock
);
1866 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1867 acpi_video_dev_unregister_backlight(dev
);
1868 mutex_unlock(&video
->device_list_lock
);
1870 video
->backlight_registered
= false;
1875 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1878 struct acpi_device
*adev
= device
->dev
;
1880 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1881 acpi_video_device_notify
, device
);
1882 if (ACPI_FAILURE(status
))
1883 dev_err(&adev
->dev
, "Error installing notify handler\n");
1885 device
->flags
.notify
= 1;
1888 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1890 struct input_dev
*input
;
1891 struct acpi_video_device
*dev
;
1894 video
->input
= input
= input_allocate_device();
1900 error
= acpi_video_bus_start_devices(video
);
1902 goto err_free_input
;
1904 snprintf(video
->phys
, sizeof(video
->phys
),
1905 "%s/video/input0", acpi_device_hid(video
->device
));
1907 input
->name
= acpi_device_name(video
->device
);
1908 input
->phys
= video
->phys
;
1909 input
->id
.bustype
= BUS_HOST
;
1910 input
->id
.product
= 0x06;
1911 input
->dev
.parent
= &video
->device
->dev
;
1912 input
->evbit
[0] = BIT(EV_KEY
);
1913 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1914 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1915 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1916 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1917 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1918 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1919 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1920 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1922 error
= input_register_device(input
);
1926 mutex_lock(&video
->device_list_lock
);
1927 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1928 acpi_video_dev_add_notify_handler(dev
);
1929 mutex_unlock(&video
->device_list_lock
);
1934 acpi_video_bus_stop_devices(video
);
1936 input_free_device(input
);
1937 video
->input
= NULL
;
1942 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1944 if (dev
->flags
.notify
) {
1945 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1946 acpi_video_device_notify
);
1947 dev
->flags
.notify
= 0;
1951 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1953 struct acpi_video_device
*dev
;
1955 mutex_lock(&video
->device_list_lock
);
1956 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1957 acpi_video_dev_remove_notify_handler(dev
);
1958 mutex_unlock(&video
->device_list_lock
);
1960 acpi_video_bus_stop_devices(video
);
1961 input_unregister_device(video
->input
);
1962 video
->input
= NULL
;
1965 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1967 struct acpi_video_device
*dev
, *next
;
1969 mutex_lock(&video
->device_list_lock
);
1970 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1971 list_del(&dev
->entry
);
1974 mutex_unlock(&video
->device_list_lock
);
1979 static int instance
;
1981 static int acpi_video_bus_add(struct acpi_device
*device
)
1983 struct acpi_video_bus
*video
;
1987 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1988 device
->parent
->handle
, 1,
1989 acpi_video_bus_match
, NULL
,
1991 if (status
== AE_ALREADY_EXISTS
) {
1992 printk(KERN_WARNING FW_BUG
1993 "Duplicate ACPI video bus devices for the"
1994 " same VGA controller, please try module "
1995 "parameter \"video.allow_duplicates=1\""
1996 "if the current driver doesn't work.\n");
1997 if (!allow_duplicates
)
2001 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
2005 /* a hack to fix the duplicate name "VID" problem on T61 */
2006 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
2008 device
->pnp
.bus_id
[3] = '0' + instance
;
2011 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2012 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
2014 device
->pnp
.bus_id
[3] = '0' + instance
;
2018 video
->device
= device
;
2019 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
2020 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
2021 device
->driver_data
= video
;
2023 acpi_video_bus_find_cap(video
);
2024 error
= acpi_video_bus_check(video
);
2026 goto err_free_video
;
2028 mutex_init(&video
->device_list_lock
);
2029 INIT_LIST_HEAD(&video
->video_device_list
);
2031 error
= acpi_video_bus_get_devices(video
, device
);
2035 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
2036 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
2037 video
->flags
.multihead
? "yes" : "no",
2038 video
->flags
.rom
? "yes" : "no",
2039 video
->flags
.post
? "yes" : "no");
2040 mutex_lock(&video_list_lock
);
2041 list_add_tail(&video
->entry
, &video_bus_head
);
2042 mutex_unlock(&video_list_lock
);
2044 acpi_video_bus_register_backlight(video
);
2045 acpi_video_bus_add_notify_handler(video
);
2050 acpi_video_bus_put_devices(video
);
2051 kfree(video
->attached_array
);
2054 device
->driver_data
= NULL
;
2059 static int acpi_video_bus_remove(struct acpi_device
*device
)
2061 struct acpi_video_bus
*video
= NULL
;
2064 if (!device
|| !acpi_driver_data(device
))
2067 video
= acpi_driver_data(device
);
2069 acpi_video_bus_remove_notify_handler(video
);
2070 acpi_video_bus_unregister_backlight(video
);
2071 acpi_video_bus_put_devices(video
);
2073 mutex_lock(&video_list_lock
);
2074 list_del(&video
->entry
);
2075 mutex_unlock(&video_list_lock
);
2077 kfree(video
->attached_array
);
2083 static int __init
is_i740(struct pci_dev
*dev
)
2085 if (dev
->device
== 0x00D1)
2087 if (dev
->device
== 0x7000)
2092 static int __init
intel_opregion_present(void)
2095 struct pci_dev
*dev
= NULL
;
2098 for_each_pci_dev(dev
) {
2099 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2101 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2103 /* We don't want to poke around undefined i740 registers */
2106 pci_read_config_dword(dev
, 0xfc, &address
);
2114 /* Check if the chassis-type indicates there is no builtin LCD panel */
2115 static bool dmi_is_desktop(void)
2117 const char *chassis_type
;
2120 chassis_type
= dmi_get_system_info(DMI_CHASSIS_TYPE
);
2124 if (kstrtoul(chassis_type
, 10, &type
) != 0)
2128 case 0x03: /* Desktop */
2129 case 0x04: /* Low Profile Desktop */
2130 case 0x05: /* Pizza Box */
2131 case 0x06: /* Mini Tower */
2132 case 0x07: /* Tower */
2133 case 0x10: /* Lunch Box */
2134 case 0x11: /* Main Server Chassis */
2141 int acpi_video_register(void)
2145 mutex_lock(®ister_count_mutex
);
2146 if (register_count
) {
2148 * if the function of acpi_video_register is already called,
2149 * don't register the acpi_vide_bus again and return no error.
2155 * We're seeing a lot of bogus backlight interfaces on newer machines
2156 * without a LCD such as desktops, servers and HDMI sticks. Checking
2157 * the lcd flag fixes this, so enable this on any machines which are
2158 * win8 ready (where we also prefer the native backlight driver, so
2159 * normally the acpi_video code should not register there anyways).
2161 if (only_lcd
== -1) {
2162 if (dmi_is_desktop() && acpi_osi_is_win8())
2168 dmi_check_system(video_dmi_table
);
2170 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2175 * When the acpi_video_bus is loaded successfully, increase
2176 * the counter reference.
2181 mutex_unlock(®ister_count_mutex
);
2184 EXPORT_SYMBOL(acpi_video_register
);
2186 void acpi_video_unregister(void)
2188 mutex_lock(®ister_count_mutex
);
2189 if (register_count
) {
2190 acpi_bus_unregister_driver(&acpi_video_bus
);
2193 mutex_unlock(®ister_count_mutex
);
2195 EXPORT_SYMBOL(acpi_video_unregister
);
2197 void acpi_video_unregister_backlight(void)
2199 struct acpi_video_bus
*video
;
2201 mutex_lock(®ister_count_mutex
);
2202 if (register_count
) {
2203 mutex_lock(&video_list_lock
);
2204 list_for_each_entry(video
, &video_bus_head
, entry
)
2205 acpi_video_bus_unregister_backlight(video
);
2206 mutex_unlock(&video_list_lock
);
2208 mutex_unlock(®ister_count_mutex
);
2211 bool acpi_video_handles_brightness_key_presses(void)
2213 bool have_video_busses
;
2215 mutex_lock(&video_list_lock
);
2216 have_video_busses
= !list_empty(&video_bus_head
);
2217 mutex_unlock(&video_list_lock
);
2219 return have_video_busses
&&
2220 (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
);
2222 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses
);
2225 * This is kind of nasty. Hardware using Intel chipsets may require
2226 * the video opregion code to be run first in order to initialise
2227 * state before any ACPI video calls are made. To handle this we defer
2228 * registration of the video class until the opregion code has run.
2231 static int __init
acpi_video_init(void)
2234 * Let the module load even if ACPI is disabled (e.g. due to
2235 * a broken BIOS) so that i915.ko can still be loaded on such
2236 * old systems without an AcpiOpRegion.
2238 * acpi_video_register() will report -ENODEV later as well due
2239 * to acpi_disabled when i915.ko tries to register itself afterwards.
2244 if (intel_opregion_present())
2247 return acpi_video_register();
2250 static void __exit
acpi_video_exit(void)
2252 acpi_video_detect_exit();
2253 acpi_video_unregister();
2258 module_init(acpi_video_init
);
2259 module_exit(acpi_video_exit
);