2 * video.c - ACPI Video Driver
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
49 #define PREFIX "ACPI: "
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
65 #define MAX_NAME_LEN 20
67 #define _COMPONENT ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
74 static bool brightness_switch_enabled
= 1;
75 module_param(brightness_switch_enabled
, bool, 0644);
78 * By default, we don't allow duplicate ACPI video bus devices
79 * under the same VGA controller
81 static bool allow_duplicates
;
82 module_param(allow_duplicates
, bool, 0644);
85 * Some BIOSes claim they use minimum backlight at boot,
86 * and this may bring dimming screen after boot
88 static bool use_bios_initial_backlight
= 1;
89 module_param(use_bios_initial_backlight
, bool, 0644);
92 * For Windows 8 systems: if set ture and the GPU driver has
93 * registered a backlight interface, skip registering ACPI video's.
95 static bool use_native_backlight
= false;
96 module_param(use_native_backlight
, bool, 0644);
98 static int register_count
;
99 static struct mutex video_list_lock
;
100 static struct list_head video_bus_head
;
101 static int acpi_video_bus_add(struct acpi_device
*device
);
102 static int acpi_video_bus_remove(struct acpi_device
*device
);
103 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
105 static const struct acpi_device_id video_device_ids
[] = {
109 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
111 static struct acpi_driver acpi_video_bus
= {
113 .class = ACPI_VIDEO_CLASS
,
114 .ids
= video_device_ids
,
116 .add
= acpi_video_bus_add
,
117 .remove
= acpi_video_bus_remove
,
118 .notify
= acpi_video_bus_notify
,
122 struct acpi_video_bus_flags
{
123 u8 multihead
:1; /* can switch video heads */
124 u8 rom
:1; /* can retrieve a video rom */
125 u8 post
:1; /* can configure the head to */
129 struct acpi_video_bus_cap
{
130 u8 _DOS
:1; /* Enable/Disable output switching */
131 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
132 u8 _ROM
:1; /* Get ROM Data */
133 u8 _GPD
:1; /* Get POST Device */
134 u8 _SPD
:1; /* Set POST Device */
135 u8 _VPO
:1; /* Video POST Options */
139 struct acpi_video_device_attrib
{
140 u32 display_index
:4; /* A zero-based instance of the Display */
141 u32 display_port_attachment
:4; /* This field differentiates the display type */
142 u32 display_type
:4; /* Describe the specific type in use */
143 u32 vendor_specific
:4; /* Chipset Vendor Specific */
144 u32 bios_can_detect
:1; /* BIOS can detect the device */
145 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
147 u32 pipe_id
:3; /* For VGA multiple-head devices. */
148 u32 reserved
:10; /* Must be 0 */
149 u32 device_id_scheme
:1; /* Device ID Scheme */
152 struct acpi_video_enumerated_device
{
155 struct acpi_video_device_attrib attrib
;
157 struct acpi_video_device
*bind_info
;
160 struct acpi_video_bus
{
161 struct acpi_device
*device
;
163 struct acpi_video_enumerated_device
*attached_array
;
165 struct acpi_video_bus_cap cap
;
166 struct acpi_video_bus_flags flags
;
167 struct list_head video_device_list
;
168 struct mutex device_list_lock
; /* protects video_device_list */
169 struct list_head entry
;
170 struct input_dev
*input
;
171 char phys
[32]; /* for input device */
172 struct notifier_block pm_nb
;
175 struct acpi_video_device_flags
{
186 struct acpi_video_device_cap
{
187 u8 _ADR
:1; /* Return the unique ID */
188 u8 _BCL
:1; /* Query list of brightness control levels supported */
189 u8 _BCM
:1; /* Set the brightness level */
190 u8 _BQC
:1; /* Get current brightness level */
191 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
192 u8 _DDC
:1; /* Return the EDID for this device */
195 struct acpi_video_brightness_flags
{
196 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
197 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order */
198 u8 _BQC_use_index
:1; /* _BQC returns an index value */
201 struct acpi_video_device_brightness
{
205 struct acpi_video_brightness_flags flags
;
208 struct acpi_video_device
{
209 unsigned long device_id
;
210 struct acpi_video_device_flags flags
;
211 struct acpi_video_device_cap cap
;
212 struct list_head entry
;
213 struct acpi_video_bus
*video
;
214 struct acpi_device
*dev
;
215 struct acpi_video_device_brightness
*brightness
;
216 struct backlight_device
*backlight
;
217 struct thermal_cooling_device
*cooling_dev
;
220 static const char device_decode
[][30] = {
221 "motherboard VGA device",
227 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
228 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
229 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
230 struct acpi_video_device
*device
);
231 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
232 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
234 static int acpi_video_device_lcd_get_level_current(
235 struct acpi_video_device
*device
,
236 unsigned long long *level
, bool raw
);
237 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
238 u32 level_current
, u32 event
);
239 static int acpi_video_switch_brightness(struct acpi_video_device
*device
,
242 static bool acpi_video_verify_backlight_support(void)
244 if (acpi_osi_is_win8() && use_native_backlight
&&
245 backlight_device_registered(BACKLIGHT_RAW
))
247 return acpi_video_backlight_support();
250 /* backlight device sysfs support */
251 static int acpi_video_get_brightness(struct backlight_device
*bd
)
253 unsigned long long cur_level
;
255 struct acpi_video_device
*vd
= bl_get_data(bd
);
257 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
259 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
260 if (vd
->brightness
->levels
[i
] == cur_level
)
262 * The first two entries are special - see page 575
263 * of the ACPI spec 3.0
270 static int acpi_video_set_brightness(struct backlight_device
*bd
)
272 int request_level
= bd
->props
.brightness
+ 2;
273 struct acpi_video_device
*vd
= bl_get_data(bd
);
275 return acpi_video_device_lcd_set_level(vd
,
276 vd
->brightness
->levels
[request_level
]);
279 static const struct backlight_ops acpi_backlight_ops
= {
280 .get_brightness
= acpi_video_get_brightness
,
281 .update_status
= acpi_video_set_brightness
,
284 /* thermal cooling device callbacks */
285 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
288 struct acpi_device
*device
= cooling_dev
->devdata
;
289 struct acpi_video_device
*video
= acpi_driver_data(device
);
291 *state
= video
->brightness
->count
- 3;
295 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
298 struct acpi_device
*device
= cooling_dev
->devdata
;
299 struct acpi_video_device
*video
= acpi_driver_data(device
);
300 unsigned long long level
;
303 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
305 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
306 if (level
== video
->brightness
->levels
[offset
]) {
307 *state
= video
->brightness
->count
- offset
- 1;
315 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
317 struct acpi_device
*device
= cooling_dev
->devdata
;
318 struct acpi_video_device
*video
= acpi_driver_data(device
);
321 if (state
>= video
->brightness
->count
- 2)
324 state
= video
->brightness
->count
- state
;
325 level
= video
->brightness
->levels
[state
- 1];
326 return acpi_video_device_lcd_set_level(video
, level
);
329 static const struct thermal_cooling_device_ops video_cooling_ops
= {
330 .get_max_state
= video_get_max_state
,
331 .get_cur_state
= video_get_cur_state
,
332 .set_cur_state
= video_set_cur_state
,
336 * --------------------------------------------------------------------------
338 * --------------------------------------------------------------------------
342 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
343 union acpi_object
**levels
)
346 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
347 union acpi_object
*obj
;
352 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
353 if (!ACPI_SUCCESS(status
))
355 obj
= (union acpi_object
*)buffer
.pointer
;
356 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
357 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
367 kfree(buffer
.pointer
);
373 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
378 status
= acpi_execute_simple_method(device
->dev
->handle
,
380 if (ACPI_FAILURE(status
)) {
381 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
385 device
->brightness
->curr
= level
;
386 for (state
= 2; state
< device
->brightness
->count
; state
++)
387 if (level
== device
->brightness
->levels
[state
]) {
388 if (device
->backlight
)
389 device
->backlight
->props
.brightness
= state
- 2;
393 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
398 * For some buggy _BQC methods, we need to add a constant value to
399 * the _BQC return value to get the actual current brightness level
402 static int bqc_offset_aml_bug_workaround
;
403 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
405 bqc_offset_aml_bug_workaround
= 9;
409 static int video_ignore_initial_backlight(const struct dmi_system_id
*d
)
411 use_bios_initial_backlight
= 0;
415 static struct dmi_system_id video_dmi_table
[] __initdata
= {
417 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
420 .callback
= video_set_bqc_offset
,
421 .ident
= "Acer Aspire 5720",
423 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
428 .callback
= video_set_bqc_offset
,
429 .ident
= "Acer Aspire 5710Z",
431 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
436 .callback
= video_set_bqc_offset
,
437 .ident
= "eMachines E510",
439 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
440 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
444 .callback
= video_set_bqc_offset
,
445 .ident
= "Acer Aspire 5315",
447 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
452 .callback
= video_set_bqc_offset
,
453 .ident
= "Acer Aspire 7720",
455 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
460 .callback
= video_ignore_initial_backlight
,
461 .ident
= "HP Folio 13-2000",
463 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Folio 13 - 2000 Notebook PC"),
468 .callback
= video_ignore_initial_backlight
,
469 .ident
= "Fujitsu E753",
471 DMI_MATCH(DMI_BOARD_VENDOR
, "FUJITSU"),
472 DMI_MATCH(DMI_PRODUCT_NAME
, "LIFEBOOK E753"),
476 .callback
= video_ignore_initial_backlight
,
477 .ident
= "HP Pavilion dm4",
479 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion dm4 Notebook PC"),
484 .callback
= video_ignore_initial_backlight
,
485 .ident
= "HP Pavilion g6 Notebook PC",
487 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
488 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion g6 Notebook PC"),
492 .callback
= video_ignore_initial_backlight
,
493 .ident
= "HP 1000 Notebook PC",
495 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
496 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 1000 Notebook PC"),
500 .callback
= video_ignore_initial_backlight
,
501 .ident
= "HP Pavilion m4",
503 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
504 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion m4 Notebook PC"),
508 .callback
= video_ignore_initial_backlight
,
509 .ident
= "HP 250 G1",
511 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
512 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 250 G1 Notebook PC"),
518 static unsigned long long
519 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
520 unsigned long long bqc_value
)
522 unsigned long long level
;
524 if (device
->brightness
->flags
._BQC_use_index
) {
526 * _BQC returns an index that doesn't account for
527 * the first 2 items with special meaning, so we need
528 * to compensate for that by offsetting ourselves
530 if (device
->brightness
->flags
._BCL_reversed
)
531 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
533 level
= device
->brightness
->levels
[bqc_value
+ 2];
538 level
+= bqc_offset_aml_bug_workaround
;
544 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
545 unsigned long long *level
, bool raw
)
547 acpi_status status
= AE_OK
;
550 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
551 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
553 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
555 if (ACPI_SUCCESS(status
)) {
558 * Caller has indicated he wants the raw
559 * value returned by _BQC, so don't furtherly
560 * mess with the value.
565 *level
= acpi_video_bqc_value_to_level(device
, *level
);
567 for (i
= 2; i
< device
->brightness
->count
; i
++)
568 if (device
->brightness
->levels
[i
] == *level
) {
569 device
->brightness
->curr
= *level
;
573 * BQC returned an invalid level.
576 ACPI_WARNING((AE_INFO
,
577 "%s returned an invalid level",
579 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
583 * should we return an error or ignore this failure?
584 * dev->brightness->curr is a cached value which stores
585 * the correct current backlight level in most cases.
586 * ACPI video backlight still works w/ buggy _BQC.
587 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
589 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
590 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
594 *level
= device
->brightness
->curr
;
599 acpi_video_device_EDID(struct acpi_video_device
*device
,
600 union acpi_object
**edid
, ssize_t length
)
603 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
604 union acpi_object
*obj
;
605 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
606 struct acpi_object_list args
= { 1, &arg0
};
614 arg0
.integer
.value
= 1;
615 else if (length
== 256)
616 arg0
.integer
.value
= 2;
620 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
621 if (ACPI_FAILURE(status
))
624 obj
= buffer
.pointer
;
626 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
629 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
641 * video : video bus device pointer
643 * 0. The system BIOS should NOT automatically switch(toggle)
644 * the active display output.
645 * 1. The system BIOS should automatically switch (toggle) the
646 * active display output. No switch event.
647 * 2. The _DGS value should be locked.
648 * 3. The system BIOS should not automatically switch (toggle) the
649 * active display output, but instead generate the display switch
652 * 0. The system BIOS should automatically control the brightness level
653 * of the LCD when the power changes from AC to DC
654 * 1. The system BIOS should NOT automatically control the brightness
655 * level of the LCD when the power changes from AC to DC.
661 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
665 if (!video
->cap
._DOS
)
668 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
670 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
671 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
672 (lcd_flag
<< 2) | bios_flag
);
673 if (ACPI_FAILURE(status
))
680 * Simple comparison function used to sort backlight levels.
684 acpi_video_cmp_level(const void *a
, const void *b
)
686 return *(int *)a
- *(int *)b
;
690 * Decides if _BQC/_BCQ for this system is usable
692 * We do this by changing the level first and then read out the current
693 * brightness level, if the value does not match, find out if it is using
694 * index. If not, clear the _BQC/_BCQ capability.
696 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
697 int max_level
, int current_level
)
699 struct acpi_video_device_brightness
*br
= device
->brightness
;
701 unsigned long long level
;
704 /* don't mess with existing known broken systems */
705 if (bqc_offset_aml_bug_workaround
)
709 * Some systems always report current brightness level as maximum
710 * through _BQC, we need to test another value for them.
712 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
714 result
= acpi_video_device_lcd_set_level(device
, test_level
);
718 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
722 if (level
!= test_level
) {
723 /* buggy _BQC found, need to find out if it uses index */
724 if (level
< br
->count
) {
725 if (br
->flags
._BCL_reversed
)
726 level
= br
->count
- 3 - level
;
727 if (br
->levels
[level
+ 2] == test_level
)
728 br
->flags
._BQC_use_index
= 1;
731 if (!br
->flags
._BQC_use_index
)
732 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
741 * device : video output device (LCD, CRT, ..)
744 * Maximum brightness level
746 * Allocate and initialize device->brightness.
750 acpi_video_init_brightness(struct acpi_video_device
*device
)
752 union acpi_object
*obj
= NULL
;
753 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
754 unsigned long long level
, level_old
;
755 union acpi_object
*o
;
756 struct acpi_video_device_brightness
*br
= NULL
;
757 int result
= -EINVAL
;
759 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
760 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
761 "LCD brightness level\n"));
765 if (obj
->package
.count
< 2)
768 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
770 printk(KERN_ERR
"can't allocate memory\n");
775 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
782 for (i
= 0; i
< obj
->package
.count
; i
++) {
783 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
784 if (o
->type
!= ACPI_TYPE_INTEGER
) {
785 printk(KERN_ERR PREFIX
"Invalid data\n");
788 br
->levels
[count
] = (u32
) o
->integer
.value
;
790 if (br
->levels
[count
] > max_level
)
791 max_level
= br
->levels
[count
];
796 * some buggy BIOS don't export the levels
797 * when machine is on AC/Battery in _BCL package.
798 * In this case, the first two elements in _BCL packages
799 * are also supported brightness levels that OS should take care of.
801 for (i
= 2; i
< count
; i
++) {
802 if (br
->levels
[i
] == br
->levels
[0])
804 if (br
->levels
[i
] == br
->levels
[1])
808 if (level_ac_battery
< 2) {
809 level_ac_battery
= 2 - level_ac_battery
;
810 br
->flags
._BCL_no_ac_battery_levels
= 1;
811 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
812 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
813 count
+= level_ac_battery
;
814 } else if (level_ac_battery
> 2)
815 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
817 /* Check if the _BCL package is in a reversed order */
818 if (max_level
== br
->levels
[2]) {
819 br
->flags
._BCL_reversed
= 1;
820 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
821 acpi_video_cmp_level
, NULL
);
822 } else if (max_level
!= br
->levels
[count
- 1])
824 "Found unordered _BCL package"));
827 device
->brightness
= br
;
829 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
830 br
->curr
= level
= max_level
;
832 if (!device
->cap
._BQC
)
835 result
= acpi_video_device_lcd_get_level_current(device
,
838 goto out_free_levels
;
840 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
842 goto out_free_levels
;
844 * cap._BQC may get cleared due to _BQC is found to be broken
845 * in acpi_video_bqc_quirk, so check again here.
847 if (!device
->cap
._BQC
)
850 if (use_bios_initial_backlight
) {
851 level
= acpi_video_bqc_value_to_level(device
, level_old
);
853 * On some buggy laptops, _BQC returns an uninitialized
854 * value when invoked for the first time, i.e.
855 * level_old is invalid (no matter whether it's a level
856 * or an index). Set the backlight to max_level in this case.
858 for (i
= 2; i
< br
->count
; i
++)
859 if (level_old
== br
->levels
[i
])
866 result
= acpi_video_device_lcd_set_level(device
, level
);
868 goto out_free_levels
;
870 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
871 "found %d brightness levels\n", count
- 2));
880 device
->brightness
= NULL
;
887 * device : video output device (LCD, CRT, ..)
892 * Find out all required AML methods defined under the output
896 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
898 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
899 device
->cap
._ADR
= 1;
900 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
901 device
->cap
._BCL
= 1;
902 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
903 device
->cap
._BCM
= 1;
904 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
905 device
->cap
._BQC
= 1;
906 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
907 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
908 device
->cap
._BCQ
= 1;
911 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
912 device
->cap
._DDC
= 1;
917 * device : video output device (VGA)
922 * Find out all required AML methods defined under the video bus device.
925 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
927 if (acpi_has_method(video
->device
->handle
, "_DOS"))
929 if (acpi_has_method(video
->device
->handle
, "_DOD"))
931 if (acpi_has_method(video
->device
->handle
, "_ROM"))
933 if (acpi_has_method(video
->device
->handle
, "_GPD"))
935 if (acpi_has_method(video
->device
->handle
, "_SPD"))
937 if (acpi_has_method(video
->device
->handle
, "_VPO"))
942 * Check whether the video bus device has required AML method to
943 * support the desired features
946 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
948 acpi_status status
= -ENOENT
;
954 dev
= acpi_get_pci_dev(video
->device
->handle
);
960 * Since there is no HID, CID and so on for VGA driver, we have
961 * to check well known required nodes.
964 /* Does this device support video switching? */
965 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
966 if (!video
->cap
._DOS
) {
967 printk(KERN_WARNING FW_BUG
968 "ACPI(%s) defines _DOD but not _DOS\n",
969 acpi_device_bid(video
->device
));
971 video
->flags
.multihead
= 1;
975 /* Does this device support retrieving a video ROM? */
976 if (video
->cap
._ROM
) {
977 video
->flags
.rom
= 1;
981 /* Does this device support configuring which video device to POST? */
982 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
983 video
->flags
.post
= 1;
991 * --------------------------------------------------------------------------
993 * --------------------------------------------------------------------------
996 /* device interface */
997 static struct acpi_video_device_attrib
*
998 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1000 struct acpi_video_enumerated_device
*ids
;
1003 for (i
= 0; i
< video
->attached_count
; i
++) {
1004 ids
= &video
->attached_array
[i
];
1005 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1006 return &ids
->value
.attrib
;
1013 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1014 unsigned long device_id
)
1016 struct acpi_video_enumerated_device
*ids
;
1019 for (i
= 0; i
< video
->attached_count
; i
++) {
1020 ids
= &video
->attached_array
[i
];
1021 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1022 return ids
->value
.int_val
;
1029 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1030 struct acpi_video_bus
*video
)
1032 unsigned long long device_id
;
1033 int status
, device_type
;
1034 struct acpi_video_device
*data
;
1035 struct acpi_video_device_attrib
*attribute
;
1038 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1039 /* Some device omits _ADR, we skip them instead of fail */
1040 if (ACPI_FAILURE(status
))
1043 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1047 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1048 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1049 device
->driver_data
= data
;
1051 data
->device_id
= device_id
;
1052 data
->video
= video
;
1055 attribute
= acpi_video_get_device_attr(video
, device_id
);
1057 if (attribute
&& attribute
->device_id_scheme
) {
1058 switch (attribute
->display_type
) {
1059 case ACPI_VIDEO_DISPLAY_CRT
:
1060 data
->flags
.crt
= 1;
1062 case ACPI_VIDEO_DISPLAY_TV
:
1063 data
->flags
.tvout
= 1;
1065 case ACPI_VIDEO_DISPLAY_DVI
:
1066 data
->flags
.dvi
= 1;
1068 case ACPI_VIDEO_DISPLAY_LCD
:
1069 data
->flags
.lcd
= 1;
1072 data
->flags
.unknown
= 1;
1075 if (attribute
->bios_can_detect
)
1076 data
->flags
.bios
= 1;
1078 /* Check for legacy IDs */
1079 device_type
= acpi_video_get_device_type(video
, device_id
);
1080 /* Ignore bits 16 and 18-20 */
1081 switch (device_type
& 0xffe2ffff) {
1082 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1083 data
->flags
.crt
= 1;
1085 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1086 data
->flags
.lcd
= 1;
1088 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1089 data
->flags
.tvout
= 1;
1092 data
->flags
.unknown
= 1;
1096 acpi_video_device_bind(video
, data
);
1097 acpi_video_device_find_cap(data
);
1099 mutex_lock(&video
->device_list_lock
);
1100 list_add_tail(&data
->entry
, &video
->video_device_list
);
1101 mutex_unlock(&video
->device_list_lock
);
1108 * video : video bus device
1113 * Enumerate the video device list of the video bus,
1114 * bind the ids with the corresponding video devices
1115 * under the video bus.
1118 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1120 struct acpi_video_device
*dev
;
1122 mutex_lock(&video
->device_list_lock
);
1124 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1125 acpi_video_device_bind(video
, dev
);
1127 mutex_unlock(&video
->device_list_lock
);
1132 * video : video bus device
1133 * device : video output device under the video
1139 * Bind the ids with the corresponding video devices
1140 * under the video bus.
1144 acpi_video_device_bind(struct acpi_video_bus
*video
,
1145 struct acpi_video_device
*device
)
1147 struct acpi_video_enumerated_device
*ids
;
1150 for (i
= 0; i
< video
->attached_count
; i
++) {
1151 ids
= &video
->attached_array
[i
];
1152 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1153 ids
->bind_info
= device
;
1154 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1161 * video : video bus device
1166 * Call _DOD to enumerate all devices attached to display adapter
1170 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1175 struct acpi_video_enumerated_device
*active_list
;
1176 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1177 union acpi_object
*dod
= NULL
;
1178 union acpi_object
*obj
;
1180 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1181 if (!ACPI_SUCCESS(status
)) {
1182 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1186 dod
= buffer
.pointer
;
1187 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1188 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1193 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1194 dod
->package
.count
));
1196 active_list
= kcalloc(1 + dod
->package
.count
,
1197 sizeof(struct acpi_video_enumerated_device
),
1205 for (i
= 0; i
< dod
->package
.count
; i
++) {
1206 obj
= &dod
->package
.elements
[i
];
1208 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1209 printk(KERN_ERR PREFIX
1210 "Invalid _DOD data in element %d\n", i
);
1214 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1215 active_list
[count
].bind_info
= NULL
;
1216 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1217 (int)obj
->integer
.value
));
1221 kfree(video
->attached_array
);
1223 video
->attached_array
= active_list
;
1224 video
->attached_count
= count
;
1227 kfree(buffer
.pointer
);
1232 acpi_video_get_next_level(struct acpi_video_device
*device
,
1233 u32 level_current
, u32 event
)
1235 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1236 max
= max_below
= 0;
1237 min
= min_above
= 255;
1238 /* Find closest level to level_current */
1239 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1240 l
= device
->brightness
->levels
[i
];
1241 if (abs(l
- level_current
) < abs(delta
)) {
1242 delta
= l
- level_current
;
1247 /* Ajust level_current to closest available level */
1248 level_current
+= delta
;
1249 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1250 l
= device
->brightness
->levels
[i
];
1255 if (l
< min_above
&& l
> level_current
)
1257 if (l
> max_below
&& l
< level_current
)
1262 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1263 return (level_current
< max
) ? min_above
: min
;
1264 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1265 return (level_current
< max
) ? min_above
: max
;
1266 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1267 return (level_current
> min
) ? max_below
: min
;
1268 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1269 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1272 return level_current
;
1277 acpi_video_switch_brightness(struct acpi_video_device
*device
, int event
)
1279 unsigned long long level_current
, level_next
;
1280 int result
= -EINVAL
;
1282 /* no warning message if acpi_backlight=vendor or a quirk is used */
1283 if (!acpi_video_verify_backlight_support())
1286 if (!device
->brightness
)
1289 result
= acpi_video_device_lcd_get_level_current(device
,
1295 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1297 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1300 backlight_force_update(device
->backlight
,
1301 BACKLIGHT_UPDATE_HOTKEY
);
1305 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1310 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1313 struct acpi_video_bus
*video
;
1314 struct acpi_video_device
*video_device
;
1315 union acpi_object
*buffer
= NULL
;
1319 if (!device
|| !acpi_driver_data(device
))
1322 video
= acpi_driver_data(device
);
1324 for (i
= 0; i
< video
->attached_count
; i
++) {
1325 video_device
= video
->attached_array
[i
].bind_info
;
1331 if (!video_device
->cap
._DDC
)
1336 case ACPI_VIDEO_DISPLAY_CRT
:
1337 if (!video_device
->flags
.crt
)
1340 case ACPI_VIDEO_DISPLAY_TV
:
1341 if (!video_device
->flags
.tvout
)
1344 case ACPI_VIDEO_DISPLAY_DVI
:
1345 if (!video_device
->flags
.dvi
)
1348 case ACPI_VIDEO_DISPLAY_LCD
:
1349 if (!video_device
->flags
.lcd
)
1353 } else if (video_device
->device_id
!= device_id
) {
1357 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1359 if (ACPI_FAILURE(status
) || !buffer
||
1360 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1362 status
= acpi_video_device_EDID(video_device
, &buffer
,
1364 if (ACPI_FAILURE(status
) || !buffer
||
1365 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1370 *edid
= buffer
->buffer
.pointer
;
1376 EXPORT_SYMBOL(acpi_video_get_edid
);
1379 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1380 struct acpi_device
*device
)
1383 struct acpi_device
*dev
;
1386 * There are systems where video module known to work fine regardless
1387 * of broken _DOD and ignoring returned value here doesn't cause
1390 acpi_video_device_enumerate(video
);
1392 list_for_each_entry(dev
, &device
->children
, node
) {
1394 status
= acpi_video_bus_get_one_device(dev
, video
);
1396 dev_err(&dev
->dev
, "Can't attach device\n");
1403 /* acpi_video interface */
1406 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1407 * preform any automatic brightness change on receiving a notification.
1409 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1411 return acpi_video_bus_DOS(video
, 0,
1412 acpi_osi_is_win8() ? 1 : 0);
1415 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1417 return acpi_video_bus_DOS(video
, 0,
1418 acpi_osi_is_win8() ? 0 : 1);
1421 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1423 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1424 struct input_dev
*input
;
1427 if (!video
|| !video
->input
)
1430 input
= video
->input
;
1433 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1434 * most likely via hotkey. */
1435 keycode
= KEY_SWITCHVIDEOMODE
;
1438 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1440 acpi_video_device_enumerate(video
);
1441 acpi_video_device_rebind(video
);
1442 keycode
= KEY_SWITCHVIDEOMODE
;
1445 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1446 keycode
= KEY_SWITCHVIDEOMODE
;
1448 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1449 keycode
= KEY_VIDEO_NEXT
;
1451 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1452 keycode
= KEY_VIDEO_PREV
;
1456 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1457 "Unsupported event [0x%x]\n", event
));
1461 if (acpi_notifier_call_chain(device
, event
, 0))
1462 /* Something vetoed the keypress. */
1466 input_report_key(input
, keycode
, 1);
1468 input_report_key(input
, keycode
, 0);
1475 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1477 struct acpi_video_device
*video_device
= data
;
1478 struct acpi_device
*device
= NULL
;
1479 struct acpi_video_bus
*bus
;
1480 struct input_dev
*input
;
1486 device
= video_device
->dev
;
1487 bus
= video_device
->video
;
1491 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1492 if (brightness_switch_enabled
)
1493 acpi_video_switch_brightness(video_device
, event
);
1494 keycode
= KEY_BRIGHTNESS_CYCLE
;
1496 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1497 if (brightness_switch_enabled
)
1498 acpi_video_switch_brightness(video_device
, event
);
1499 keycode
= KEY_BRIGHTNESSUP
;
1501 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1502 if (brightness_switch_enabled
)
1503 acpi_video_switch_brightness(video_device
, event
);
1504 keycode
= KEY_BRIGHTNESSDOWN
;
1506 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1507 if (brightness_switch_enabled
)
1508 acpi_video_switch_brightness(video_device
, event
);
1509 keycode
= KEY_BRIGHTNESS_ZERO
;
1511 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1512 if (brightness_switch_enabled
)
1513 acpi_video_switch_brightness(video_device
, event
);
1514 keycode
= KEY_DISPLAY_OFF
;
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1518 "Unsupported event [0x%x]\n", event
));
1522 acpi_notifier_call_chain(device
, event
, 0);
1525 input_report_key(input
, keycode
, 1);
1527 input_report_key(input
, keycode
, 0);
1534 static int acpi_video_resume(struct notifier_block
*nb
,
1535 unsigned long val
, void *ign
)
1537 struct acpi_video_bus
*video
;
1538 struct acpi_video_device
*video_device
;
1542 case PM_HIBERNATION_PREPARE
:
1543 case PM_SUSPEND_PREPARE
:
1544 case PM_RESTORE_PREPARE
:
1548 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1550 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1552 for (i
= 0; i
< video
->attached_count
; i
++) {
1553 video_device
= video
->attached_array
[i
].bind_info
;
1554 if (video_device
&& video_device
->backlight
)
1555 acpi_video_set_brightness(video_device
->backlight
);
1562 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1563 void **return_value
)
1565 struct acpi_device
*device
= context
;
1566 struct acpi_device
*sibling
;
1569 if (handle
== device
->handle
)
1570 return AE_CTRL_TERMINATE
;
1572 result
= acpi_bus_get_device(handle
, &sibling
);
1576 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1577 return AE_ALREADY_EXISTS
;
1582 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1584 if (acpi_video_verify_backlight_support()) {
1585 struct backlight_properties props
;
1586 struct pci_dev
*pdev
;
1587 acpi_handle acpi_parent
;
1588 struct device
*parent
= NULL
;
1593 result
= acpi_video_init_brightness(device
);
1596 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1601 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1603 pdev
= acpi_get_pci_dev(acpi_parent
);
1605 parent
= &pdev
->dev
;
1609 memset(&props
, 0, sizeof(struct backlight_properties
));
1610 props
.type
= BACKLIGHT_FIRMWARE
;
1611 props
.max_brightness
= device
->brightness
->count
- 3;
1612 device
->backlight
= backlight_device_register(name
,
1615 &acpi_backlight_ops
,
1618 if (IS_ERR(device
->backlight
))
1622 * Save current brightness level in case we have to restore it
1623 * before acpi_video_device_lcd_set_level() is called next time.
1625 device
->backlight
->props
.brightness
=
1626 acpi_video_get_brightness(device
->backlight
);
1628 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1629 device
->dev
, &video_cooling_ops
);
1630 if (IS_ERR(device
->cooling_dev
)) {
1632 * Set cooling_dev to NULL so we don't crash trying to
1634 * Also, why the hell we are returning early and
1635 * not attempt to register video output if cooling
1636 * device registration failed?
1639 device
->cooling_dev
= NULL
;
1643 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1644 device
->cooling_dev
->id
);
1645 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1646 &device
->cooling_dev
->device
.kobj
,
1649 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1650 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1651 &device
->dev
->dev
.kobj
, "device");
1653 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1657 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1659 struct acpi_video_device
*dev
;
1661 mutex_lock(&video
->device_list_lock
);
1662 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1663 acpi_video_dev_register_backlight(dev
);
1664 mutex_unlock(&video
->device_list_lock
);
1666 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1667 video
->pm_nb
.priority
= 0;
1668 return register_pm_notifier(&video
->pm_nb
);
1671 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1673 if (device
->backlight
) {
1674 backlight_device_unregister(device
->backlight
);
1675 device
->backlight
= NULL
;
1677 if (device
->brightness
) {
1678 kfree(device
->brightness
->levels
);
1679 kfree(device
->brightness
);
1680 device
->brightness
= NULL
;
1682 if (device
->cooling_dev
) {
1683 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1684 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1685 thermal_cooling_device_unregister(device
->cooling_dev
);
1686 device
->cooling_dev
= NULL
;
1690 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1692 struct acpi_video_device
*dev
;
1693 int error
= unregister_pm_notifier(&video
->pm_nb
);
1695 mutex_lock(&video
->device_list_lock
);
1696 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1697 acpi_video_dev_unregister_backlight(dev
);
1698 mutex_unlock(&video
->device_list_lock
);
1703 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1706 struct acpi_device
*adev
= device
->dev
;
1708 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1709 acpi_video_device_notify
, device
);
1710 if (ACPI_FAILURE(status
))
1711 dev_err(&adev
->dev
, "Error installing notify handler\n");
1713 device
->flags
.notify
= 1;
1716 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1718 struct input_dev
*input
;
1719 struct acpi_video_device
*dev
;
1722 video
->input
= input
= input_allocate_device();
1728 error
= acpi_video_bus_start_devices(video
);
1730 goto err_free_input
;
1732 snprintf(video
->phys
, sizeof(video
->phys
),
1733 "%s/video/input0", acpi_device_hid(video
->device
));
1735 input
->name
= acpi_device_name(video
->device
);
1736 input
->phys
= video
->phys
;
1737 input
->id
.bustype
= BUS_HOST
;
1738 input
->id
.product
= 0x06;
1739 input
->dev
.parent
= &video
->device
->dev
;
1740 input
->evbit
[0] = BIT(EV_KEY
);
1741 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1742 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1743 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1744 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1745 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1746 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1747 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1748 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1750 error
= input_register_device(input
);
1754 mutex_lock(&video
->device_list_lock
);
1755 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1756 acpi_video_dev_add_notify_handler(dev
);
1757 mutex_unlock(&video
->device_list_lock
);
1762 acpi_video_bus_stop_devices(video
);
1764 input_free_device(input
);
1765 video
->input
= NULL
;
1770 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1772 if (dev
->flags
.notify
) {
1773 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1774 acpi_video_device_notify
);
1775 dev
->flags
.notify
= 0;
1779 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1781 struct acpi_video_device
*dev
;
1783 mutex_lock(&video
->device_list_lock
);
1784 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1785 acpi_video_dev_remove_notify_handler(dev
);
1786 mutex_unlock(&video
->device_list_lock
);
1788 acpi_video_bus_stop_devices(video
);
1789 input_unregister_device(video
->input
);
1790 video
->input
= NULL
;
1793 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1795 struct acpi_video_device
*dev
, *next
;
1797 mutex_lock(&video
->device_list_lock
);
1798 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1799 list_del(&dev
->entry
);
1802 mutex_unlock(&video
->device_list_lock
);
1807 static int instance
;
1809 static int acpi_video_bus_add(struct acpi_device
*device
)
1811 struct acpi_video_bus
*video
;
1815 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1816 device
->parent
->handle
, 1,
1817 acpi_video_bus_match
, NULL
,
1819 if (status
== AE_ALREADY_EXISTS
) {
1820 printk(KERN_WARNING FW_BUG
1821 "Duplicate ACPI video bus devices for the"
1822 " same VGA controller, please try module "
1823 "parameter \"video.allow_duplicates=1\""
1824 "if the current driver doesn't work.\n");
1825 if (!allow_duplicates
)
1829 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1833 /* a hack to fix the duplicate name "VID" problem on T61 */
1834 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1836 device
->pnp
.bus_id
[3] = '0' + instance
;
1839 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1840 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1842 device
->pnp
.bus_id
[3] = '0' + instance
;
1846 video
->device
= device
;
1847 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1848 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1849 device
->driver_data
= video
;
1851 acpi_video_bus_find_cap(video
);
1852 error
= acpi_video_bus_check(video
);
1854 goto err_free_video
;
1856 mutex_init(&video
->device_list_lock
);
1857 INIT_LIST_HEAD(&video
->video_device_list
);
1859 error
= acpi_video_bus_get_devices(video
, device
);
1863 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1864 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1865 video
->flags
.multihead
? "yes" : "no",
1866 video
->flags
.rom
? "yes" : "no",
1867 video
->flags
.post
? "yes" : "no");
1868 mutex_lock(&video_list_lock
);
1869 list_add_tail(&video
->entry
, &video_bus_head
);
1870 mutex_unlock(&video_list_lock
);
1872 acpi_video_bus_register_backlight(video
);
1873 acpi_video_bus_add_notify_handler(video
);
1878 acpi_video_bus_put_devices(video
);
1879 kfree(video
->attached_array
);
1882 device
->driver_data
= NULL
;
1887 static int acpi_video_bus_remove(struct acpi_device
*device
)
1889 struct acpi_video_bus
*video
= NULL
;
1892 if (!device
|| !acpi_driver_data(device
))
1895 video
= acpi_driver_data(device
);
1897 acpi_video_bus_remove_notify_handler(video
);
1898 acpi_video_bus_unregister_backlight(video
);
1899 acpi_video_bus_put_devices(video
);
1901 mutex_lock(&video_list_lock
);
1902 list_del(&video
->entry
);
1903 mutex_unlock(&video_list_lock
);
1905 kfree(video
->attached_array
);
1911 static int __init
is_i740(struct pci_dev
*dev
)
1913 if (dev
->device
== 0x00D1)
1915 if (dev
->device
== 0x7000)
1920 static int __init
intel_opregion_present(void)
1923 struct pci_dev
*dev
= NULL
;
1926 for_each_pci_dev(dev
) {
1927 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1929 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
1931 /* We don't want to poke around undefined i740 registers */
1934 pci_read_config_dword(dev
, 0xfc, &address
);
1942 int acpi_video_register(void)
1945 if (register_count
) {
1947 * if the function of acpi_video_register is already called,
1948 * don't register the acpi_vide_bus again and return no error.
1953 mutex_init(&video_list_lock
);
1954 INIT_LIST_HEAD(&video_bus_head
);
1956 result
= acpi_bus_register_driver(&acpi_video_bus
);
1961 * When the acpi_video_bus is loaded successfully, increase
1962 * the counter reference.
1968 EXPORT_SYMBOL(acpi_video_register
);
1970 void acpi_video_unregister(void)
1972 if (!register_count
) {
1974 * If the acpi video bus is already unloaded, don't
1975 * unload it again and return directly.
1979 acpi_bus_unregister_driver(&acpi_video_bus
);
1985 EXPORT_SYMBOL(acpi_video_unregister
);
1988 * This is kind of nasty. Hardware using Intel chipsets may require
1989 * the video opregion code to be run first in order to initialise
1990 * state before any ACPI video calls are made. To handle this we defer
1991 * registration of the video class until the opregion code has run.
1994 static int __init
acpi_video_init(void)
1996 dmi_check_system(video_dmi_table
);
1998 if (intel_opregion_present())
2001 return acpi_video_register();
2004 static void __exit
acpi_video_exit(void)
2006 acpi_video_unregister();
2011 module_init(acpi_video_init
);
2012 module_exit(acpi_video_exit
);