2 * video.c - ACPI Video Driver ($Revision:$)
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);
91 static int register_count
= 0;
92 static int acpi_video_bus_add(struct acpi_device
*device
);
93 static int acpi_video_bus_remove(struct acpi_device
*device
);
94 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
96 static const struct acpi_device_id video_device_ids
[] = {
100 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
102 static struct acpi_driver acpi_video_bus
= {
104 .class = ACPI_VIDEO_CLASS
,
105 .ids
= video_device_ids
,
107 .add
= acpi_video_bus_add
,
108 .remove
= acpi_video_bus_remove
,
109 .notify
= acpi_video_bus_notify
,
113 struct acpi_video_bus_flags
{
114 u8 multihead
:1; /* can switch video heads */
115 u8 rom
:1; /* can retrieve a video rom */
116 u8 post
:1; /* can configure the head to */
120 struct acpi_video_bus_cap
{
121 u8 _DOS
:1; /*Enable/Disable output switching */
122 u8 _DOD
:1; /*Enumerate all devices attached to display adapter */
123 u8 _ROM
:1; /*Get ROM Data */
124 u8 _GPD
:1; /*Get POST Device */
125 u8 _SPD
:1; /*Set POST Device */
126 u8 _VPO
:1; /*Video POST Options */
130 struct acpi_video_device_attrib
{
131 u32 display_index
:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment
:4; /*This field differentiates the display type */
133 u32 display_type
:4; /*Describe the specific type in use */
134 u32 vendor_specific
:4; /*Chipset Vendor Specific */
135 u32 bios_can_detect
:1; /*BIOS can detect the device */
136 u32 depend_on_vga
:1; /*Non-VGA output device whose power is related to
138 u32 pipe_id
:3; /*For VGA multiple-head devices. */
139 u32 reserved
:10; /*Must be 0 */
140 u32 device_id_scheme
:1; /*Device ID Scheme */
143 struct acpi_video_enumerated_device
{
146 struct acpi_video_device_attrib attrib
;
148 struct acpi_video_device
*bind_info
;
151 struct acpi_video_bus
{
152 struct acpi_device
*device
;
154 struct acpi_video_enumerated_device
*attached_array
;
156 struct acpi_video_bus_cap cap
;
157 struct acpi_video_bus_flags flags
;
158 struct list_head video_device_list
;
159 struct mutex device_list_lock
; /* protects video_device_list */
160 struct input_dev
*input
;
161 char phys
[32]; /* for input device */
162 struct notifier_block pm_nb
;
165 struct acpi_video_device_flags
{
176 struct acpi_video_device_cap
{
177 u8 _ADR
:1; /*Return the unique ID */
178 u8 _BCL
:1; /*Query list of brightness control levels supported */
179 u8 _BCM
:1; /*Set the brightness level */
180 u8 _BQC
:1; /* Get current brightness level */
181 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
182 u8 _DDC
:1; /*Return the EDID for this device */
185 struct acpi_video_brightness_flags
{
186 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
187 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order*/
188 u8 _BCL_use_index
:1; /* levels in _BCL are index values */
189 u8 _BCM_use_index
:1; /* input of _BCM is an index value */
190 u8 _BQC_use_index
:1; /* _BQC returns an index value */
193 struct acpi_video_device_brightness
{
197 struct acpi_video_brightness_flags flags
;
200 struct acpi_video_device
{
201 unsigned long device_id
;
202 struct acpi_video_device_flags flags
;
203 struct acpi_video_device_cap cap
;
204 struct list_head entry
;
205 struct acpi_video_bus
*video
;
206 struct acpi_device
*dev
;
207 struct acpi_video_device_brightness
*brightness
;
208 struct backlight_device
*backlight
;
209 struct thermal_cooling_device
*cooling_dev
;
212 static const char device_decode
[][30] = {
213 "motherboard VGA device",
219 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
220 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
221 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
222 struct acpi_video_device
*device
);
223 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
224 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
226 static int acpi_video_device_lcd_get_level_current(
227 struct acpi_video_device
*device
,
228 unsigned long long *level
, bool raw
);
229 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
230 u32 level_current
, u32 event
);
231 static int acpi_video_switch_brightness(struct acpi_video_device
*device
,
234 /*backlight device sysfs support*/
235 static int acpi_video_get_brightness(struct backlight_device
*bd
)
237 unsigned long long cur_level
;
239 struct acpi_video_device
*vd
=
240 (struct acpi_video_device
*)bl_get_data(bd
);
242 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
244 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
245 if (vd
->brightness
->levels
[i
] == cur_level
)
246 /* The first two entries are special - see page 575
247 of the ACPI spec 3.0 */
253 static int acpi_video_set_brightness(struct backlight_device
*bd
)
255 int request_level
= bd
->props
.brightness
+ 2;
256 struct acpi_video_device
*vd
=
257 (struct acpi_video_device
*)bl_get_data(bd
);
259 return acpi_video_device_lcd_set_level(vd
,
260 vd
->brightness
->levels
[request_level
]);
263 static const struct backlight_ops acpi_backlight_ops
= {
264 .get_brightness
= acpi_video_get_brightness
,
265 .update_status
= acpi_video_set_brightness
,
268 /* thermal cooling device callbacks */
269 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
272 struct acpi_device
*device
= cooling_dev
->devdata
;
273 struct acpi_video_device
*video
= acpi_driver_data(device
);
275 *state
= video
->brightness
->count
- 3;
279 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
282 struct acpi_device
*device
= cooling_dev
->devdata
;
283 struct acpi_video_device
*video
= acpi_driver_data(device
);
284 unsigned long long level
;
287 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
289 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
290 if (level
== video
->brightness
->levels
[offset
]) {
291 *state
= video
->brightness
->count
- offset
- 1;
299 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
301 struct acpi_device
*device
= cooling_dev
->devdata
;
302 struct acpi_video_device
*video
= acpi_driver_data(device
);
305 if ( state
>= video
->brightness
->count
- 2)
308 state
= video
->brightness
->count
- state
;
309 level
= video
->brightness
->levels
[state
-1];
310 return acpi_video_device_lcd_set_level(video
, level
);
313 static const struct thermal_cooling_device_ops video_cooling_ops
= {
314 .get_max_state
= video_get_max_state
,
315 .get_cur_state
= video_get_cur_state
,
316 .set_cur_state
= video_set_cur_state
,
319 /* --------------------------------------------------------------------------
321 -------------------------------------------------------------------------- */
324 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
325 union acpi_object
**levels
)
328 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
329 union acpi_object
*obj
;
334 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
335 if (!ACPI_SUCCESS(status
))
337 obj
= (union acpi_object
*)buffer
.pointer
;
338 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
339 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
349 kfree(buffer
.pointer
);
355 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
358 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
359 struct acpi_object_list args
= { 1, &arg0
};
362 arg0
.integer
.value
= level
;
364 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCM",
366 if (ACPI_FAILURE(status
)) {
367 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
371 device
->brightness
->curr
= level
;
372 for (state
= 2; state
< device
->brightness
->count
; state
++)
373 if (level
== device
->brightness
->levels
[state
]) {
374 if (device
->backlight
)
375 device
->backlight
->props
.brightness
= state
- 2;
379 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
388 static int bqc_offset_aml_bug_workaround
;
389 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
391 bqc_offset_aml_bug_workaround
= 9;
395 static int video_ignore_initial_backlight(const struct dmi_system_id
*d
)
397 use_bios_initial_backlight
= 0;
401 static struct dmi_system_id video_dmi_table
[] __initdata
= {
403 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
406 .callback
= video_set_bqc_offset
,
407 .ident
= "Acer Aspire 5720",
409 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
410 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
414 .callback
= video_set_bqc_offset
,
415 .ident
= "Acer Aspire 5710Z",
417 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
422 .callback
= video_set_bqc_offset
,
423 .ident
= "eMachines E510",
425 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
426 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
430 .callback
= video_set_bqc_offset
,
431 .ident
= "Acer Aspire 5315",
433 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
438 .callback
= video_set_bqc_offset
,
439 .ident
= "Acer Aspire 7720",
441 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
446 .callback
= video_ignore_initial_backlight
,
447 .ident
= "HP Folio 13-2000",
449 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
450 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Folio 13 - 2000 Notebook PC"),
454 .callback
= video_ignore_initial_backlight
,
455 .ident
= "Fujitsu E753",
457 DMI_MATCH(DMI_BOARD_VENDOR
, "FUJITSU"),
458 DMI_MATCH(DMI_PRODUCT_NAME
, "LIFEBOOK E753"),
462 .callback
= video_ignore_initial_backlight
,
463 .ident
= "HP Pavilion dm4",
465 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
466 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion dm4 Notebook PC"),
470 .callback
= video_ignore_initial_backlight
,
471 .ident
= "HP Pavilion g6 Notebook PC",
473 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
474 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion g6 Notebook PC"),
478 .callback
= video_ignore_initial_backlight
,
479 .ident
= "HP 1000 Notebook PC",
481 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
482 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 1000 Notebook PC"),
486 .callback
= video_ignore_initial_backlight
,
487 .ident
= "HP Pavilion m4",
489 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
490 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion m4 Notebook PC"),
496 static unsigned long long
497 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
498 unsigned long long bqc_value
)
500 unsigned long long level
;
502 if (device
->brightness
->flags
._BQC_use_index
) {
504 * _BQC returns an index that doesn't account for
505 * the first 2 items with special meaning, so we need
506 * to compensate for that by offsetting ourselves
508 if (device
->brightness
->flags
._BCL_reversed
)
509 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
511 level
= device
->brightness
->levels
[bqc_value
+ 2];
516 level
+= bqc_offset_aml_bug_workaround
;
522 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
523 unsigned long long *level
, bool raw
)
525 acpi_status status
= AE_OK
;
528 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
529 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
531 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
533 if (ACPI_SUCCESS(status
)) {
536 * Caller has indicated he wants the raw
537 * value returned by _BQC, so don't furtherly
538 * mess with the value.
543 *level
= acpi_video_bqc_value_to_level(device
, *level
);
545 for (i
= 2; i
< device
->brightness
->count
; i
++)
546 if (device
->brightness
->levels
[i
] == *level
) {
547 device
->brightness
->curr
= *level
;
551 * BQC returned an invalid level.
554 ACPI_WARNING((AE_INFO
,
555 "%s returned an invalid level",
557 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
560 * should we return an error or ignore this failure?
561 * dev->brightness->curr is a cached value which stores
562 * the correct current backlight level in most cases.
563 * ACPI video backlight still works w/ buggy _BQC.
564 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
566 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
567 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
571 *level
= device
->brightness
->curr
;
576 acpi_video_device_EDID(struct acpi_video_device
*device
,
577 union acpi_object
**edid
, ssize_t length
)
580 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
581 union acpi_object
*obj
;
582 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
583 struct acpi_object_list args
= { 1, &arg0
};
591 arg0
.integer
.value
= 1;
592 else if (length
== 256)
593 arg0
.integer
.value
= 2;
597 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
598 if (ACPI_FAILURE(status
))
601 obj
= buffer
.pointer
;
603 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
606 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
618 * video : video bus device pointer
620 * 0. The system BIOS should NOT automatically switch(toggle)
621 * the active display output.
622 * 1. The system BIOS should automatically switch (toggle) the
623 * active display output. No switch event.
624 * 2. The _DGS value should be locked.
625 * 3. The system BIOS should not automatically switch (toggle) the
626 * active display output, but instead generate the display switch
629 * 0. The system BIOS should automatically control the brightness level
630 * of the LCD when the power changes from AC to DC
631 * 1. The system BIOS should NOT automatically control the brightness
632 * level of the LCD when the power changes from AC to DC.
638 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
641 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
642 struct acpi_object_list args
= { 1, &arg0
};
644 if (!video
->cap
._DOS
)
647 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
649 arg0
.integer
.value
= (lcd_flag
<< 2) | bios_flag
;
650 video
->dos_setting
= arg0
.integer
.value
;
651 status
= acpi_evaluate_object(video
->device
->handle
, "_DOS",
653 if (ACPI_FAILURE(status
))
660 * Simple comparison function used to sort backlight levels.
664 acpi_video_cmp_level(const void *a
, const void *b
)
666 return *(int *)a
- *(int *)b
;
670 * Decides if _BQC/_BCQ for this system is usable
672 * We do this by changing the level first and then read out the current
673 * brightness level, if the value does not match, find out if it is using
674 * index. If not, clear the _BQC/_BCQ capability.
676 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
677 int max_level
, int current_level
)
679 struct acpi_video_device_brightness
*br
= device
->brightness
;
681 unsigned long long level
;
684 /* don't mess with existing known broken systems */
685 if (bqc_offset_aml_bug_workaround
)
689 * Some systems always report current brightness level as maximum
690 * through _BQC, we need to test another value for them.
692 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
694 result
= acpi_video_device_lcd_set_level(device
, test_level
);
698 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
702 if (level
!= test_level
) {
703 /* buggy _BQC found, need to find out if it uses index */
704 if (level
< br
->count
) {
705 if (br
->flags
._BCL_reversed
)
706 level
= br
->count
- 3 - level
;
707 if (br
->levels
[level
+ 2] == test_level
)
708 br
->flags
._BQC_use_index
= 1;
711 if (!br
->flags
._BQC_use_index
)
712 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
721 * device : video output device (LCD, CRT, ..)
724 * Maximum brightness level
726 * Allocate and initialize device->brightness.
730 acpi_video_init_brightness(struct acpi_video_device
*device
)
732 union acpi_object
*obj
= NULL
;
733 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
734 unsigned long long level
, level_old
;
735 union acpi_object
*o
;
736 struct acpi_video_device_brightness
*br
= NULL
;
737 int result
= -EINVAL
;
739 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
741 "LCD brightness level\n"));
745 if (obj
->package
.count
< 2)
748 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
750 printk(KERN_ERR
"can't allocate memory\n");
755 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
762 for (i
= 0; i
< obj
->package
.count
; i
++) {
763 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
764 if (o
->type
!= ACPI_TYPE_INTEGER
) {
765 printk(KERN_ERR PREFIX
"Invalid data\n");
768 br
->levels
[count
] = (u32
) o
->integer
.value
;
770 if (br
->levels
[count
] > max_level
)
771 max_level
= br
->levels
[count
];
776 * some buggy BIOS don't export the levels
777 * when machine is on AC/Battery in _BCL package.
778 * In this case, the first two elements in _BCL packages
779 * are also supported brightness levels that OS should take care of.
781 for (i
= 2; i
< count
; i
++) {
782 if (br
->levels
[i
] == br
->levels
[0])
784 if (br
->levels
[i
] == br
->levels
[1])
788 if (level_ac_battery
< 2) {
789 level_ac_battery
= 2 - level_ac_battery
;
790 br
->flags
._BCL_no_ac_battery_levels
= 1;
791 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
792 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
793 count
+= level_ac_battery
;
794 } else if (level_ac_battery
> 2)
795 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
797 /* Check if the _BCL package is in a reversed order */
798 if (max_level
== br
->levels
[2]) {
799 br
->flags
._BCL_reversed
= 1;
800 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
801 acpi_video_cmp_level
, NULL
);
802 } else if (max_level
!= br
->levels
[count
- 1])
804 "Found unordered _BCL package"));
807 device
->brightness
= br
;
809 /* Check the input/output of _BQC/_BCL/_BCM */
810 if ((max_level
< 100) && (max_level
<= (count
- 2)))
811 br
->flags
._BCL_use_index
= 1;
814 * _BCM is always consistent with _BCL,
815 * at least for all the laptops we have ever seen.
817 br
->flags
._BCM_use_index
= br
->flags
._BCL_use_index
;
819 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
820 br
->curr
= level
= max_level
;
822 if (!device
->cap
._BQC
)
825 result
= acpi_video_device_lcd_get_level_current(device
,
828 goto out_free_levels
;
830 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
832 goto out_free_levels
;
834 * cap._BQC may get cleared due to _BQC is found to be broken
835 * in acpi_video_bqc_quirk, so check again here.
837 if (!device
->cap
._BQC
)
840 if (use_bios_initial_backlight
) {
841 level
= acpi_video_bqc_value_to_level(device
, level_old
);
843 * On some buggy laptops, _BQC returns an uninitialized
844 * value when invoked for the first time, i.e.
845 * level_old is invalid (no matter whether it's a level
846 * or an index). Set the backlight to max_level in this case.
848 for (i
= 2; i
< br
->count
; i
++)
849 if (level_old
== br
->levels
[i
])
856 result
= acpi_video_device_lcd_set_level(device
, level
);
858 goto out_free_levels
;
860 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
861 "found %d brightness levels\n", count
- 2));
870 device
->brightness
= NULL
;
877 * device : video output device (LCD, CRT, ..)
882 * Find out all required AML methods defined under the output
886 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
888 acpi_handle h_dummy1
;
890 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_ADR", &h_dummy1
))) {
891 device
->cap
._ADR
= 1;
893 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCL", &h_dummy1
))) {
894 device
->cap
._BCL
= 1;
896 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCM", &h_dummy1
))) {
897 device
->cap
._BCM
= 1;
899 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
,"_BQC",&h_dummy1
)))
900 device
->cap
._BQC
= 1;
901 else if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCQ",
903 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
904 device
->cap
._BCQ
= 1;
907 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DDC", &h_dummy1
))) {
908 device
->cap
._DDC
= 1;
911 if (acpi_video_init_brightness(device
))
914 if (acpi_video_backlight_support()) {
915 struct backlight_properties props
;
916 struct pci_dev
*pdev
;
917 acpi_handle acpi_parent
;
918 struct device
*parent
= NULL
;
920 static int count
= 0;
923 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
928 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
930 pdev
= acpi_get_pci_dev(acpi_parent
);
936 memset(&props
, 0, sizeof(struct backlight_properties
));
937 props
.type
= BACKLIGHT_FIRMWARE
;
938 props
.max_brightness
= device
->brightness
->count
- 3;
939 device
->backlight
= backlight_device_register(name
,
945 if (IS_ERR(device
->backlight
))
949 * Save current brightness level in case we have to restore it
950 * before acpi_video_device_lcd_set_level() is called next time.
952 device
->backlight
->props
.brightness
=
953 acpi_video_get_brightness(device
->backlight
);
955 device
->cooling_dev
= thermal_cooling_device_register("LCD",
956 device
->dev
, &video_cooling_ops
);
957 if (IS_ERR(device
->cooling_dev
)) {
959 * Set cooling_dev to NULL so we don't crash trying to
961 * Also, why the hell we are returning early and
962 * not attempt to register video output if cooling
963 * device registration failed?
966 device
->cooling_dev
= NULL
;
970 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
971 device
->cooling_dev
->id
);
972 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
973 &device
->cooling_dev
->device
.kobj
,
976 printk(KERN_ERR PREFIX
"Create sysfs link\n");
977 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
978 &device
->dev
->dev
.kobj
, "device");
980 printk(KERN_ERR PREFIX
"Create sysfs link\n");
983 /* Remove the brightness object. */
984 kfree(device
->brightness
->levels
);
985 kfree(device
->brightness
);
986 device
->brightness
= NULL
;
992 * device : video output device (VGA)
997 * Find out all required AML methods defined under the video bus device.
1000 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
1002 acpi_handle h_dummy1
;
1004 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOS", &h_dummy1
))) {
1005 video
->cap
._DOS
= 1;
1007 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOD", &h_dummy1
))) {
1008 video
->cap
._DOD
= 1;
1010 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_ROM", &h_dummy1
))) {
1011 video
->cap
._ROM
= 1;
1013 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_GPD", &h_dummy1
))) {
1014 video
->cap
._GPD
= 1;
1016 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_SPD", &h_dummy1
))) {
1017 video
->cap
._SPD
= 1;
1019 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_VPO", &h_dummy1
))) {
1020 video
->cap
._VPO
= 1;
1025 * Check whether the video bus device has required AML method to
1026 * support the desired features
1029 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
1031 acpi_status status
= -ENOENT
;
1032 struct pci_dev
*dev
;
1037 dev
= acpi_get_pci_dev(video
->device
->handle
);
1042 /* Since there is no HID, CID and so on for VGA driver, we have
1043 * to check well known required nodes.
1046 /* Does this device support video switching? */
1047 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1048 if (!video
->cap
._DOS
) {
1049 printk(KERN_WARNING FW_BUG
1050 "ACPI(%s) defines _DOD but not _DOS\n",
1051 acpi_device_bid(video
->device
));
1053 video
->flags
.multihead
= 1;
1057 /* Does this device support retrieving a video ROM? */
1058 if (video
->cap
._ROM
) {
1059 video
->flags
.rom
= 1;
1063 /* Does this device support configuring which video device to POST? */
1064 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1065 video
->flags
.post
= 1;
1072 /* --------------------------------------------------------------------------
1074 -------------------------------------------------------------------------- */
1076 /* device interface */
1077 static struct acpi_video_device_attrib
*
1078 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1080 struct acpi_video_enumerated_device
*ids
;
1083 for (i
= 0; i
< video
->attached_count
; i
++) {
1084 ids
= &video
->attached_array
[i
];
1085 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1086 return &ids
->value
.attrib
;
1093 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1094 unsigned long device_id
)
1096 struct acpi_video_enumerated_device
*ids
;
1099 for (i
= 0; i
< video
->attached_count
; i
++) {
1100 ids
= &video
->attached_array
[i
];
1101 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1102 return ids
->value
.int_val
;
1109 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1110 struct acpi_video_bus
*video
)
1112 unsigned long long device_id
;
1113 int status
, device_type
;
1114 struct acpi_video_device
*data
;
1115 struct acpi_video_device_attrib
* attribute
;
1118 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1119 /* Some device omits _ADR, we skip them instead of fail */
1120 if (ACPI_FAILURE(status
))
1123 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1127 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1128 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1129 device
->driver_data
= data
;
1131 data
->device_id
= device_id
;
1132 data
->video
= video
;
1135 attribute
= acpi_video_get_device_attr(video
, device_id
);
1137 if((attribute
!= NULL
) && attribute
->device_id_scheme
) {
1138 switch (attribute
->display_type
) {
1139 case ACPI_VIDEO_DISPLAY_CRT
:
1140 data
->flags
.crt
= 1;
1142 case ACPI_VIDEO_DISPLAY_TV
:
1143 data
->flags
.tvout
= 1;
1145 case ACPI_VIDEO_DISPLAY_DVI
:
1146 data
->flags
.dvi
= 1;
1148 case ACPI_VIDEO_DISPLAY_LCD
:
1149 data
->flags
.lcd
= 1;
1152 data
->flags
.unknown
= 1;
1155 if(attribute
->bios_can_detect
)
1156 data
->flags
.bios
= 1;
1158 /* Check for legacy IDs */
1159 device_type
= acpi_video_get_device_type(video
, device_id
);
1160 /* Ignore bits 16 and 18-20 */
1161 switch (device_type
& 0xffe2ffff) {
1162 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1163 data
->flags
.crt
= 1;
1165 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1166 data
->flags
.lcd
= 1;
1168 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1169 data
->flags
.tvout
= 1;
1172 data
->flags
.unknown
= 1;
1176 acpi_video_device_bind(video
, data
);
1177 acpi_video_device_find_cap(data
);
1179 status
= acpi_install_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1180 acpi_video_device_notify
, data
);
1181 if (ACPI_FAILURE(status
))
1182 dev_err(&device
->dev
, "Error installing notify handler\n");
1184 data
->flags
.notify
= 1;
1186 mutex_lock(&video
->device_list_lock
);
1187 list_add_tail(&data
->entry
, &video
->video_device_list
);
1188 mutex_unlock(&video
->device_list_lock
);
1195 * video : video bus device
1200 * Enumerate the video device list of the video bus,
1201 * bind the ids with the corresponding video devices
1202 * under the video bus.
1205 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1207 struct acpi_video_device
*dev
;
1209 mutex_lock(&video
->device_list_lock
);
1211 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1212 acpi_video_device_bind(video
, dev
);
1214 mutex_unlock(&video
->device_list_lock
);
1219 * video : video bus device
1220 * device : video output device under the video
1226 * Bind the ids with the corresponding video devices
1227 * under the video bus.
1231 acpi_video_device_bind(struct acpi_video_bus
*video
,
1232 struct acpi_video_device
*device
)
1234 struct acpi_video_enumerated_device
*ids
;
1237 for (i
= 0; i
< video
->attached_count
; i
++) {
1238 ids
= &video
->attached_array
[i
];
1239 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1240 ids
->bind_info
= device
;
1241 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1248 * video : video bus device
1253 * Call _DOD to enumerate all devices attached to display adapter
1257 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1262 struct acpi_video_enumerated_device
*active_list
;
1263 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1264 union acpi_object
*dod
= NULL
;
1265 union acpi_object
*obj
;
1267 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1268 if (!ACPI_SUCCESS(status
)) {
1269 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1273 dod
= buffer
.pointer
;
1274 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1275 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1280 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1281 dod
->package
.count
));
1283 active_list
= kcalloc(1 + dod
->package
.count
,
1284 sizeof(struct acpi_video_enumerated_device
),
1292 for (i
= 0; i
< dod
->package
.count
; i
++) {
1293 obj
= &dod
->package
.elements
[i
];
1295 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1296 printk(KERN_ERR PREFIX
1297 "Invalid _DOD data in element %d\n", i
);
1301 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1302 active_list
[count
].bind_info
= NULL
;
1303 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1304 (int)obj
->integer
.value
));
1308 kfree(video
->attached_array
);
1310 video
->attached_array
= active_list
;
1311 video
->attached_count
= count
;
1314 kfree(buffer
.pointer
);
1319 acpi_video_get_next_level(struct acpi_video_device
*device
,
1320 u32 level_current
, u32 event
)
1322 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1323 max
= max_below
= 0;
1324 min
= min_above
= 255;
1325 /* Find closest level to level_current */
1326 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1327 l
= device
->brightness
->levels
[i
];
1328 if (abs(l
- level_current
) < abs(delta
)) {
1329 delta
= l
- level_current
;
1334 /* Ajust level_current to closest available level */
1335 level_current
+= delta
;
1336 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1337 l
= device
->brightness
->levels
[i
];
1342 if (l
< min_above
&& l
> level_current
)
1344 if (l
> max_below
&& l
< level_current
)
1349 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1350 return (level_current
< max
) ? min_above
: min
;
1351 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1352 return (level_current
< max
) ? min_above
: max
;
1353 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1354 return (level_current
> min
) ? max_below
: min
;
1355 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1356 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1359 return level_current
;
1364 acpi_video_switch_brightness(struct acpi_video_device
*device
, int event
)
1366 unsigned long long level_current
, level_next
;
1367 int result
= -EINVAL
;
1369 /* no warning message if acpi_backlight=vendor is used */
1370 if (!acpi_video_backlight_support())
1373 if (!device
->brightness
)
1376 result
= acpi_video_device_lcd_get_level_current(device
,
1382 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1384 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1387 backlight_force_update(device
->backlight
,
1388 BACKLIGHT_UPDATE_HOTKEY
);
1392 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1397 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1400 struct acpi_video_bus
*video
;
1401 struct acpi_video_device
*video_device
;
1402 union acpi_object
*buffer
= NULL
;
1406 if (!device
|| !acpi_driver_data(device
))
1409 video
= acpi_driver_data(device
);
1411 for (i
= 0; i
< video
->attached_count
; i
++) {
1412 video_device
= video
->attached_array
[i
].bind_info
;
1418 if (!video_device
->cap
._DDC
)
1423 case ACPI_VIDEO_DISPLAY_CRT
:
1424 if (!video_device
->flags
.crt
)
1427 case ACPI_VIDEO_DISPLAY_TV
:
1428 if (!video_device
->flags
.tvout
)
1431 case ACPI_VIDEO_DISPLAY_DVI
:
1432 if (!video_device
->flags
.dvi
)
1435 case ACPI_VIDEO_DISPLAY_LCD
:
1436 if (!video_device
->flags
.lcd
)
1440 } else if (video_device
->device_id
!= device_id
) {
1444 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1446 if (ACPI_FAILURE(status
) || !buffer
||
1447 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1449 status
= acpi_video_device_EDID(video_device
, &buffer
,
1451 if (ACPI_FAILURE(status
) || !buffer
||
1452 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1457 *edid
= buffer
->buffer
.pointer
;
1463 EXPORT_SYMBOL(acpi_video_get_edid
);
1466 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1467 struct acpi_device
*device
)
1470 struct acpi_device
*dev
;
1473 * There are systems where video module known to work fine regardless
1474 * of broken _DOD and ignoring returned value here doesn't cause
1477 acpi_video_device_enumerate(video
);
1479 list_for_each_entry(dev
, &device
->children
, node
) {
1481 status
= acpi_video_bus_get_one_device(dev
, video
);
1483 dev_err(&dev
->dev
, "Can't attach device\n");
1490 static int acpi_video_bus_put_one_device(struct acpi_video_device
*device
)
1494 if (!device
|| !device
->video
)
1497 if (device
->flags
.notify
) {
1498 status
= acpi_remove_notify_handler(device
->dev
->handle
,
1499 ACPI_DEVICE_NOTIFY
, acpi_video_device_notify
);
1500 if (ACPI_FAILURE(status
))
1501 dev_err(&device
->dev
->dev
,
1502 "Can't remove video notify handler\n");
1505 if (device
->backlight
) {
1506 backlight_device_unregister(device
->backlight
);
1507 device
->backlight
= NULL
;
1509 if (device
->cooling_dev
) {
1510 sysfs_remove_link(&device
->dev
->dev
.kobj
,
1512 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
,
1514 thermal_cooling_device_unregister(device
->cooling_dev
);
1515 device
->cooling_dev
= NULL
;
1521 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1524 struct acpi_video_device
*dev
, *next
;
1526 mutex_lock(&video
->device_list_lock
);
1528 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1530 status
= acpi_video_bus_put_one_device(dev
);
1531 if (ACPI_FAILURE(status
))
1532 printk(KERN_WARNING PREFIX
1533 "hhuuhhuu bug in acpi video driver.\n");
1535 if (dev
->brightness
) {
1536 kfree(dev
->brightness
->levels
);
1537 kfree(dev
->brightness
);
1539 list_del(&dev
->entry
);
1543 mutex_unlock(&video
->device_list_lock
);
1548 /* acpi_video interface */
1551 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1552 * preform any automatic brightness change on receiving a notification.
1554 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1556 return acpi_video_bus_DOS(video
, 0,
1557 acpi_video_backlight_quirks() ? 1 : 0);
1560 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1562 return acpi_video_bus_DOS(video
, 0,
1563 acpi_video_backlight_quirks() ? 0 : 1);
1566 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1568 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1569 struct input_dev
*input
;
1575 input
= video
->input
;
1578 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1579 * most likely via hotkey. */
1580 acpi_bus_generate_proc_event(device
, event
, 0);
1581 keycode
= KEY_SWITCHVIDEOMODE
;
1584 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1586 acpi_video_device_enumerate(video
);
1587 acpi_video_device_rebind(video
);
1588 acpi_bus_generate_proc_event(device
, event
, 0);
1589 keycode
= KEY_SWITCHVIDEOMODE
;
1592 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1593 acpi_bus_generate_proc_event(device
, event
, 0);
1594 keycode
= KEY_SWITCHVIDEOMODE
;
1596 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1597 acpi_bus_generate_proc_event(device
, event
, 0);
1598 keycode
= KEY_VIDEO_NEXT
;
1600 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1601 acpi_bus_generate_proc_event(device
, event
, 0);
1602 keycode
= KEY_VIDEO_PREV
;
1606 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1607 "Unsupported event [0x%x]\n", event
));
1611 if (acpi_notifier_call_chain(device
, event
, 0))
1612 /* Something vetoed the keypress. */
1616 input_report_key(input
, keycode
, 1);
1618 input_report_key(input
, keycode
, 0);
1625 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1627 struct acpi_video_device
*video_device
= data
;
1628 struct acpi_device
*device
= NULL
;
1629 struct acpi_video_bus
*bus
;
1630 struct input_dev
*input
;
1636 device
= video_device
->dev
;
1637 bus
= video_device
->video
;
1641 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1642 if (brightness_switch_enabled
)
1643 acpi_video_switch_brightness(video_device
, event
);
1644 acpi_bus_generate_proc_event(device
, event
, 0);
1645 keycode
= KEY_BRIGHTNESS_CYCLE
;
1647 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1648 if (brightness_switch_enabled
)
1649 acpi_video_switch_brightness(video_device
, event
);
1650 acpi_bus_generate_proc_event(device
, event
, 0);
1651 keycode
= KEY_BRIGHTNESSUP
;
1653 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1654 if (brightness_switch_enabled
)
1655 acpi_video_switch_brightness(video_device
, event
);
1656 acpi_bus_generate_proc_event(device
, event
, 0);
1657 keycode
= KEY_BRIGHTNESSDOWN
;
1659 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1660 if (brightness_switch_enabled
)
1661 acpi_video_switch_brightness(video_device
, event
);
1662 acpi_bus_generate_proc_event(device
, event
, 0);
1663 keycode
= KEY_BRIGHTNESS_ZERO
;
1665 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1666 if (brightness_switch_enabled
)
1667 acpi_video_switch_brightness(video_device
, event
);
1668 acpi_bus_generate_proc_event(device
, event
, 0);
1669 keycode
= KEY_DISPLAY_OFF
;
1672 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1673 "Unsupported event [0x%x]\n", event
));
1677 acpi_notifier_call_chain(device
, event
, 0);
1680 input_report_key(input
, keycode
, 1);
1682 input_report_key(input
, keycode
, 0);
1689 static int acpi_video_resume(struct notifier_block
*nb
,
1690 unsigned long val
, void *ign
)
1692 struct acpi_video_bus
*video
;
1693 struct acpi_video_device
*video_device
;
1697 case PM_HIBERNATION_PREPARE
:
1698 case PM_SUSPEND_PREPARE
:
1699 case PM_RESTORE_PREPARE
:
1703 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1705 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1707 for (i
= 0; i
< video
->attached_count
; i
++) {
1708 video_device
= video
->attached_array
[i
].bind_info
;
1709 if (video_device
&& video_device
->backlight
)
1710 acpi_video_set_brightness(video_device
->backlight
);
1717 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1718 void **return_value
)
1720 struct acpi_device
*device
= context
;
1721 struct acpi_device
*sibling
;
1724 if (handle
== device
->handle
)
1725 return AE_CTRL_TERMINATE
;
1727 result
= acpi_bus_get_device(handle
, &sibling
);
1731 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1732 return AE_ALREADY_EXISTS
;
1737 static int instance
;
1739 static int acpi_video_bus_add(struct acpi_device
*device
)
1741 struct acpi_video_bus
*video
;
1742 struct input_dev
*input
;
1746 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1747 device
->parent
->handle
, 1,
1748 acpi_video_bus_match
, NULL
,
1750 if (status
== AE_ALREADY_EXISTS
) {
1751 printk(KERN_WARNING FW_BUG
1752 "Duplicate ACPI video bus devices for the"
1753 " same VGA controller, please try module "
1754 "parameter \"video.allow_duplicates=1\""
1755 "if the current driver doesn't work.\n");
1756 if (!allow_duplicates
)
1760 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1764 /* a hack to fix the duplicate name "VID" problem on T61 */
1765 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1767 device
->pnp
.bus_id
[3] = '0' + instance
;
1770 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1771 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1773 device
->pnp
.bus_id
[3] = '0' + instance
;
1777 video
->device
= device
;
1778 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1779 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1780 device
->driver_data
= video
;
1782 acpi_video_bus_find_cap(video
);
1783 error
= acpi_video_bus_check(video
);
1785 goto err_free_video
;
1787 mutex_init(&video
->device_list_lock
);
1788 INIT_LIST_HEAD(&video
->video_device_list
);
1790 error
= acpi_video_bus_get_devices(video
, device
);
1794 video
->input
= input
= input_allocate_device();
1800 error
= acpi_video_bus_start_devices(video
);
1802 goto err_free_input_dev
;
1804 snprintf(video
->phys
, sizeof(video
->phys
),
1805 "%s/video/input0", acpi_device_hid(video
->device
));
1807 input
->name
= acpi_device_name(video
->device
);
1808 input
->phys
= video
->phys
;
1809 input
->id
.bustype
= BUS_HOST
;
1810 input
->id
.product
= 0x06;
1811 input
->dev
.parent
= &device
->dev
;
1812 input
->evbit
[0] = BIT(EV_KEY
);
1813 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1814 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1815 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1816 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1817 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1818 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1819 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1820 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1822 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1823 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1824 video
->flags
.multihead
? "yes" : "no",
1825 video
->flags
.rom
? "yes" : "no",
1826 video
->flags
.post
? "yes" : "no");
1828 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1829 video
->pm_nb
.priority
= 0;
1830 error
= register_pm_notifier(&video
->pm_nb
);
1832 goto err_stop_video
;
1834 error
= input_register_device(input
);
1836 goto err_unregister_pm_notifier
;
1840 err_unregister_pm_notifier
:
1841 unregister_pm_notifier(&video
->pm_nb
);
1843 acpi_video_bus_stop_devices(video
);
1845 input_free_device(input
);
1847 acpi_video_bus_put_devices(video
);
1848 kfree(video
->attached_array
);
1851 device
->driver_data
= NULL
;
1856 static int acpi_video_bus_remove(struct acpi_device
*device
)
1858 struct acpi_video_bus
*video
= NULL
;
1861 if (!device
|| !acpi_driver_data(device
))
1864 video
= acpi_driver_data(device
);
1866 unregister_pm_notifier(&video
->pm_nb
);
1868 acpi_video_bus_stop_devices(video
);
1869 acpi_video_bus_put_devices(video
);
1871 input_unregister_device(video
->input
);
1872 kfree(video
->attached_array
);
1878 static int __init
is_i740(struct pci_dev
*dev
)
1880 if (dev
->device
== 0x00D1)
1882 if (dev
->device
== 0x7000)
1887 static int __init
intel_opregion_present(void)
1890 struct pci_dev
*dev
= NULL
;
1893 for_each_pci_dev(dev
) {
1894 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1896 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
1898 /* We don't want to poke around undefined i740 registers */
1901 pci_read_config_dword(dev
, 0xfc, &address
);
1909 int acpi_video_register(void)
1912 if (register_count
) {
1914 * if the function of acpi_video_register is already called,
1915 * don't register the acpi_vide_bus again and return no error.
1920 result
= acpi_bus_register_driver(&acpi_video_bus
);
1925 * When the acpi_video_bus is loaded successfully, increase
1926 * the counter reference.
1932 EXPORT_SYMBOL(acpi_video_register
);
1934 void acpi_video_unregister(void)
1936 if (!register_count
) {
1938 * If the acpi video bus is already unloaded, don't
1939 * unload it again and return directly.
1943 acpi_bus_unregister_driver(&acpi_video_bus
);
1949 EXPORT_SYMBOL(acpi_video_unregister
);
1952 * This is kind of nasty. Hardware using Intel chipsets may require
1953 * the video opregion code to be run first in order to initialise
1954 * state before any ACPI video calls are made. To handle this we defer
1955 * registration of the video class until the opregion code has run.
1958 static int __init
acpi_video_init(void)
1960 dmi_check_system(video_dmi_table
);
1962 if (intel_opregion_present())
1965 return acpi_video_register();
1968 static void __exit
acpi_video_exit(void)
1970 acpi_video_unregister();
1975 module_init(acpi_video_init
);
1976 module_exit(acpi_video_exit
);