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/video_output.h>
37 #include <linux/sort.h>
38 #include <linux/pci.h>
39 #include <linux/pci_ids.h>
40 #include <linux/slab.h>
41 #include <asm/uaccess.h>
42 #include <linux/dmi.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45 #include <linux/suspend.h>
46 #include <acpi/video.h>
48 #define PREFIX "ACPI: "
50 #define ACPI_VIDEO_CLASS "video"
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 int 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 int allow_duplicates
;
82 module_param(allow_duplicates
, bool, 0644);
84 static int register_count
= 0;
85 static int acpi_video_bus_add(struct acpi_device
*device
);
86 static int acpi_video_bus_remove(struct acpi_device
*device
, int type
);
87 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
89 static const struct acpi_device_id video_device_ids
[] = {
93 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
95 static struct acpi_driver acpi_video_bus
= {
97 .class = ACPI_VIDEO_CLASS
,
98 .ids
= video_device_ids
,
100 .add
= acpi_video_bus_add
,
101 .remove
= acpi_video_bus_remove
,
102 .notify
= acpi_video_bus_notify
,
106 struct acpi_video_bus_flags
{
107 u8 multihead
:1; /* can switch video heads */
108 u8 rom
:1; /* can retrieve a video rom */
109 u8 post
:1; /* can configure the head to */
113 struct acpi_video_bus_cap
{
114 u8 _DOS
:1; /*Enable/Disable output switching */
115 u8 _DOD
:1; /*Enumerate all devices attached to display adapter */
116 u8 _ROM
:1; /*Get ROM Data */
117 u8 _GPD
:1; /*Get POST Device */
118 u8 _SPD
:1; /*Set POST Device */
119 u8 _VPO
:1; /*Video POST Options */
123 struct acpi_video_device_attrib
{
124 u32 display_index
:4; /* A zero-based instance of the Display */
125 u32 display_port_attachment
:4; /*This field differentiates the display type */
126 u32 display_type
:4; /*Describe the specific type in use */
127 u32 vendor_specific
:4; /*Chipset Vendor Specific */
128 u32 bios_can_detect
:1; /*BIOS can detect the device */
129 u32 depend_on_vga
:1; /*Non-VGA output device whose power is related to
131 u32 pipe_id
:3; /*For VGA multiple-head devices. */
132 u32 reserved
:10; /*Must be 0 */
133 u32 device_id_scheme
:1; /*Device ID Scheme */
136 struct acpi_video_enumerated_device
{
139 struct acpi_video_device_attrib attrib
;
141 struct acpi_video_device
*bind_info
;
144 struct acpi_video_bus
{
145 struct acpi_device
*device
;
147 struct acpi_video_enumerated_device
*attached_array
;
149 struct acpi_video_bus_cap cap
;
150 struct acpi_video_bus_flags flags
;
151 struct list_head video_device_list
;
152 struct mutex device_list_lock
; /* protects video_device_list */
153 struct input_dev
*input
;
154 char phys
[32]; /* for input device */
155 struct notifier_block pm_nb
;
158 struct acpi_video_device_flags
{
168 struct acpi_video_device_cap
{
169 u8 _ADR
:1; /*Return the unique ID */
170 u8 _BCL
:1; /*Query list of brightness control levels supported */
171 u8 _BCM
:1; /*Set the brightness level */
172 u8 _BQC
:1; /* Get current brightness level */
173 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
174 u8 _DDC
:1; /*Return the EDID for this device */
175 u8 _DCS
:1; /*Return status of output device */
176 u8 _DGS
:1; /*Query graphics state */
177 u8 _DSS
:1; /*Device state set */
180 struct acpi_video_brightness_flags
{
181 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
182 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order*/
183 u8 _BCL_use_index
:1; /* levels in _BCL are index values */
184 u8 _BCM_use_index
:1; /* input of _BCM is an index value */
185 u8 _BQC_use_index
:1; /* _BQC returns an index value */
188 struct acpi_video_device_brightness
{
192 struct acpi_video_brightness_flags flags
;
195 struct acpi_video_device
{
196 unsigned long device_id
;
197 struct acpi_video_device_flags flags
;
198 struct acpi_video_device_cap cap
;
199 struct list_head entry
;
200 struct acpi_video_bus
*video
;
201 struct acpi_device
*dev
;
202 struct acpi_video_device_brightness
*brightness
;
203 struct backlight_device
*backlight
;
204 struct thermal_cooling_device
*cooling_dev
;
205 struct output_device
*output_dev
;
208 static const char device_decode
[][30] = {
209 "motherboard VGA device",
215 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
216 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
217 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
218 struct acpi_video_device
*device
);
219 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
220 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
222 static int acpi_video_device_lcd_get_level_current(
223 struct acpi_video_device
*device
,
224 unsigned long long *level
, int init
);
225 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
226 u32 level_current
, u32 event
);
227 static int acpi_video_switch_brightness(struct acpi_video_device
*device
,
229 static int acpi_video_device_get_state(struct acpi_video_device
*device
,
230 unsigned long long *state
);
231 static int acpi_video_output_get(struct output_device
*od
);
232 static int acpi_video_device_set_state(struct acpi_video_device
*device
, int state
);
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
, 0))
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 struct backlight_ops acpi_backlight_ops
= {
264 .get_brightness
= acpi_video_get_brightness
,
265 .update_status
= acpi_video_set_brightness
,
268 /*video output device sysfs support*/
269 static int acpi_video_output_get(struct output_device
*od
)
271 unsigned long long state
;
272 struct acpi_video_device
*vd
=
273 (struct acpi_video_device
*)dev_get_drvdata(&od
->dev
);
274 acpi_video_device_get_state(vd
, &state
);
278 static int acpi_video_output_set(struct output_device
*od
)
280 unsigned long state
= od
->request_state
;
281 struct acpi_video_device
*vd
=
282 (struct acpi_video_device
*)dev_get_drvdata(&od
->dev
);
283 return acpi_video_device_set_state(vd
, state
);
286 static struct output_properties acpi_output_properties
= {
287 .set_state
= acpi_video_output_set
,
288 .get_status
= acpi_video_output_get
,
292 /* thermal cooling device callbacks */
293 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
296 struct acpi_device
*device
= cooling_dev
->devdata
;
297 struct acpi_video_device
*video
= acpi_driver_data(device
);
299 *state
= video
->brightness
->count
- 3;
303 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
306 struct acpi_device
*device
= cooling_dev
->devdata
;
307 struct acpi_video_device
*video
= acpi_driver_data(device
);
308 unsigned long long level
;
311 if (acpi_video_device_lcd_get_level_current(video
, &level
, 0))
313 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
314 if (level
== video
->brightness
->levels
[offset
]) {
315 *state
= video
->brightness
->count
- offset
- 1;
323 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
325 struct acpi_device
*device
= cooling_dev
->devdata
;
326 struct acpi_video_device
*video
= acpi_driver_data(device
);
329 if ( state
>= video
->brightness
->count
- 2)
332 state
= video
->brightness
->count
- state
;
333 level
= video
->brightness
->levels
[state
-1];
334 return acpi_video_device_lcd_set_level(video
, level
);
337 static struct thermal_cooling_device_ops video_cooling_ops
= {
338 .get_max_state
= video_get_max_state
,
339 .get_cur_state
= video_get_cur_state
,
340 .set_cur_state
= video_set_cur_state
,
343 /* --------------------------------------------------------------------------
345 -------------------------------------------------------------------------- */
350 acpi_video_device_get_state(struct acpi_video_device
*device
,
351 unsigned long long *state
)
355 status
= acpi_evaluate_integer(device
->dev
->handle
, "_DCS", NULL
, state
);
361 acpi_video_device_set_state(struct acpi_video_device
*device
, int state
)
364 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
365 struct acpi_object_list args
= { 1, &arg0
};
366 unsigned long long ret
;
369 arg0
.integer
.value
= state
;
370 status
= acpi_evaluate_integer(device
->dev
->handle
, "_DSS", &args
, &ret
);
376 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
377 union acpi_object
**levels
)
380 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
381 union acpi_object
*obj
;
386 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
387 if (!ACPI_SUCCESS(status
))
389 obj
= (union acpi_object
*)buffer
.pointer
;
390 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
391 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
401 kfree(buffer
.pointer
);
407 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
410 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
411 struct acpi_object_list args
= { 1, &arg0
};
414 arg0
.integer
.value
= level
;
416 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCM",
418 if (ACPI_FAILURE(status
)) {
419 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
423 device
->brightness
->curr
= level
;
424 for (state
= 2; state
< device
->brightness
->count
; state
++)
425 if (level
== device
->brightness
->levels
[state
]) {
426 if (device
->backlight
)
427 device
->backlight
->props
.brightness
= state
- 2;
431 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
436 * For some buggy _BQC methods, we need to add a constant value to
437 * the _BQC return value to get the actual current brightness level
440 static int bqc_offset_aml_bug_workaround
;
441 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
443 bqc_offset_aml_bug_workaround
= 9;
447 static struct dmi_system_id video_dmi_table
[] __initdata
= {
449 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
452 .callback
= video_set_bqc_offset
,
453 .ident
= "Acer Aspire 5720",
455 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
460 .callback
= video_set_bqc_offset
,
461 .ident
= "Acer Aspire 5710Z",
463 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
464 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
468 .callback
= video_set_bqc_offset
,
469 .ident
= "eMachines E510",
471 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
472 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
476 .callback
= video_set_bqc_offset
,
477 .ident
= "Acer Aspire 5315",
479 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
480 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
484 .callback
= video_set_bqc_offset
,
485 .ident
= "Acer Aspire 7720",
487 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
488 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
495 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
496 unsigned long long *level
, int init
)
498 acpi_status status
= AE_OK
;
501 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
502 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
504 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
506 if (ACPI_SUCCESS(status
)) {
507 if (device
->brightness
->flags
._BQC_use_index
) {
508 if (device
->brightness
->flags
._BCL_reversed
)
509 *level
= device
->brightness
->count
511 *level
= device
->brightness
->levels
[*level
+ 2];
514 *level
+= bqc_offset_aml_bug_workaround
;
515 for (i
= 2; i
< device
->brightness
->count
; i
++)
516 if (device
->brightness
->levels
[i
] == *level
) {
517 device
->brightness
->curr
= *level
;
522 * BQC returned an invalid level.
525 ACPI_WARNING((AE_INFO
,
526 "%s returned an invalid level",
528 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
532 * should we return an error or ignore this failure?
533 * dev->brightness->curr is a cached value which stores
534 * the correct current backlight level in most cases.
535 * ACPI video backlight still works w/ buggy _BQC.
536 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
538 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
539 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
543 *level
= device
->brightness
->curr
;
548 acpi_video_device_EDID(struct acpi_video_device
*device
,
549 union acpi_object
**edid
, ssize_t length
)
552 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
553 union acpi_object
*obj
;
554 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
555 struct acpi_object_list args
= { 1, &arg0
};
563 arg0
.integer
.value
= 1;
564 else if (length
== 256)
565 arg0
.integer
.value
= 2;
569 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
570 if (ACPI_FAILURE(status
))
573 obj
= buffer
.pointer
;
575 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
578 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
590 * video : video bus device pointer
592 * 0. The system BIOS should NOT automatically switch(toggle)
593 * the active display output.
594 * 1. The system BIOS should automatically switch (toggle) the
595 * active display output. No switch event.
596 * 2. The _DGS value should be locked.
597 * 3. The system BIOS should not automatically switch (toggle) the
598 * active display output, but instead generate the display switch
601 * 0. The system BIOS should automatically control the brightness level
602 * of the LCD when the power changes from AC to DC
603 * 1. The system BIOS should NOT automatically control the brightness
604 * level of the LCD when the power changes from AC to DC.
610 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
613 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
614 struct acpi_object_list args
= { 1, &arg0
};
617 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1) {
621 arg0
.integer
.value
= (lcd_flag
<< 2) | bios_flag
;
622 video
->dos_setting
= arg0
.integer
.value
;
623 acpi_evaluate_object(video
->device
->handle
, "_DOS", &args
, NULL
);
630 * Simple comparison function used to sort backlight levels.
634 acpi_video_cmp_level(const void *a
, const void *b
)
636 return *(int *)a
- *(int *)b
;
641 * device : video output device (LCD, CRT, ..)
644 * Maximum brightness level
646 * Allocate and initialize device->brightness.
650 acpi_video_init_brightness(struct acpi_video_device
*device
)
652 union acpi_object
*obj
= NULL
;
653 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
654 unsigned long long level
, level_old
;
655 union acpi_object
*o
;
656 struct acpi_video_device_brightness
*br
= NULL
;
657 int result
= -EINVAL
;
659 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
660 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
661 "LCD brightness level\n"));
665 if (obj
->package
.count
< 2)
668 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
670 printk(KERN_ERR
"can't allocate memory\n");
675 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
682 for (i
= 0; i
< obj
->package
.count
; i
++) {
683 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
684 if (o
->type
!= ACPI_TYPE_INTEGER
) {
685 printk(KERN_ERR PREFIX
"Invalid data\n");
688 br
->levels
[count
] = (u32
) o
->integer
.value
;
690 if (br
->levels
[count
] > max_level
)
691 max_level
= br
->levels
[count
];
696 * some buggy BIOS don't export the levels
697 * when machine is on AC/Battery in _BCL package.
698 * In this case, the first two elements in _BCL packages
699 * are also supported brightness levels that OS should take care of.
701 for (i
= 2; i
< count
; i
++) {
702 if (br
->levels
[i
] == br
->levels
[0])
704 if (br
->levels
[i
] == br
->levels
[1])
708 if (level_ac_battery
< 2) {
709 level_ac_battery
= 2 - level_ac_battery
;
710 br
->flags
._BCL_no_ac_battery_levels
= 1;
711 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
712 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
713 count
+= level_ac_battery
;
714 } else if (level_ac_battery
> 2)
715 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package\n"));
717 /* Check if the _BCL package is in a reversed order */
718 if (max_level
== br
->levels
[2]) {
719 br
->flags
._BCL_reversed
= 1;
720 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
721 acpi_video_cmp_level
, NULL
);
722 } else if (max_level
!= br
->levels
[count
- 1])
724 "Found unordered _BCL package\n"));
727 device
->brightness
= br
;
729 /* Check the input/output of _BQC/_BCL/_BCM */
730 if ((max_level
< 100) && (max_level
<= (count
- 2)))
731 br
->flags
._BCL_use_index
= 1;
734 * _BCM is always consistent with _BCL,
735 * at least for all the laptops we have ever seen.
737 br
->flags
._BCM_use_index
= br
->flags
._BCL_use_index
;
739 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
740 br
->curr
= level
= max_level
;
742 if (!device
->cap
._BQC
)
745 result
= acpi_video_device_lcd_get_level_current(device
, &level_old
, 1);
747 goto out_free_levels
;
750 * Set the level to maximum and check if _BQC uses indexed value
752 result
= acpi_video_device_lcd_set_level(device
, max_level
);
754 goto out_free_levels
;
756 result
= acpi_video_device_lcd_get_level_current(device
, &level
, 0);
758 goto out_free_levels
;
760 br
->flags
._BQC_use_index
= (level
== max_level
? 0 : 1);
762 if (!br
->flags
._BQC_use_index
) {
764 * Set the backlight to the initial state.
765 * On some buggy laptops, _BQC returns an uninitialized value
766 * when invoked for the first time, i.e. level_old is invalid.
767 * set the backlight to max_level in this case
769 for (i
= 2; i
< br
->count
; i
++)
770 if (level_old
== br
->levels
[i
])
775 if (br
->flags
._BCL_reversed
)
776 level_old
= (br
->count
- 1) - level_old
;
777 level
= br
->levels
[level_old
];
780 result
= acpi_video_device_lcd_set_level(device
, level
);
782 goto out_free_levels
;
784 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
785 "found %d brightness levels\n", count
- 2));
794 device
->brightness
= NULL
;
801 * device : video output device (LCD, CRT, ..)
806 * Find out all required AML methods defined under the output
810 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
812 acpi_handle h_dummy1
;
814 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_ADR", &h_dummy1
))) {
815 device
->cap
._ADR
= 1;
817 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCL", &h_dummy1
))) {
818 device
->cap
._BCL
= 1;
820 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCM", &h_dummy1
))) {
821 device
->cap
._BCM
= 1;
823 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
,"_BQC",&h_dummy1
)))
824 device
->cap
._BQC
= 1;
825 else if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCQ",
827 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
828 device
->cap
._BCQ
= 1;
831 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DDC", &h_dummy1
))) {
832 device
->cap
._DDC
= 1;
834 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DCS", &h_dummy1
))) {
835 device
->cap
._DCS
= 1;
837 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DGS", &h_dummy1
))) {
838 device
->cap
._DGS
= 1;
840 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DSS", &h_dummy1
))) {
841 device
->cap
._DSS
= 1;
844 if (acpi_video_backlight_support()) {
845 struct backlight_properties props
;
847 static int count
= 0;
850 result
= acpi_video_init_brightness(device
);
853 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
858 memset(&props
, 0, sizeof(struct backlight_properties
));
859 props
.max_brightness
= device
->brightness
->count
- 3;
860 device
->backlight
= backlight_device_register(name
, NULL
, device
,
864 if (IS_ERR(device
->backlight
))
868 * Save current brightness level in case we have to restore it
869 * before acpi_video_device_lcd_set_level() is called next time.
871 device
->backlight
->props
.brightness
=
872 acpi_video_get_brightness(device
->backlight
);
874 result
= sysfs_create_link(&device
->backlight
->dev
.kobj
,
875 &device
->dev
->dev
.kobj
, "device");
877 printk(KERN_ERR PREFIX
"Create sysfs link\n");
879 device
->cooling_dev
= thermal_cooling_device_register("LCD",
880 device
->dev
, &video_cooling_ops
);
881 if (IS_ERR(device
->cooling_dev
)) {
883 * Set cooling_dev to NULL so we don't crash trying to
885 * Also, why the hell we are returning early and
886 * not attempt to register video output if cooling
887 * device registration failed?
890 device
->cooling_dev
= NULL
;
894 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
895 device
->cooling_dev
->id
);
896 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
897 &device
->cooling_dev
->device
.kobj
,
900 printk(KERN_ERR PREFIX
"Create sysfs link\n");
901 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
902 &device
->dev
->dev
.kobj
, "device");
904 printk(KERN_ERR PREFIX
"Create sysfs link\n");
908 if (acpi_video_display_switch_support()) {
910 if (device
->cap
._DCS
&& device
->cap
._DSS
) {
913 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
917 device
->output_dev
= video_output_register(name
,
918 NULL
, device
, &acpi_output_properties
);
926 * device : video output device (VGA)
931 * Find out all required AML methods defined under the video bus device.
934 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
936 acpi_handle h_dummy1
;
938 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOS", &h_dummy1
))) {
941 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOD", &h_dummy1
))) {
944 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_ROM", &h_dummy1
))) {
947 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_GPD", &h_dummy1
))) {
950 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_SPD", &h_dummy1
))) {
953 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_VPO", &h_dummy1
))) {
959 * Check whether the video bus device has required AML method to
960 * support the desired features
963 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
965 acpi_status status
= -ENOENT
;
971 dev
= acpi_get_pci_dev(video
->device
->handle
);
976 /* Since there is no HID, CID and so on for VGA driver, we have
977 * to check well known required nodes.
980 /* Does this device support video switching? */
981 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
982 if (!video
->cap
._DOS
) {
983 printk(KERN_WARNING FW_BUG
984 "ACPI(%s) defines _DOD but not _DOS\n",
985 acpi_device_bid(video
->device
));
987 video
->flags
.multihead
= 1;
991 /* Does this device support retrieving a video ROM? */
992 if (video
->cap
._ROM
) {
993 video
->flags
.rom
= 1;
997 /* Does this device support configuring which video device to POST? */
998 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
999 video
->flags
.post
= 1;
1006 /* --------------------------------------------------------------------------
1008 -------------------------------------------------------------------------- */
1010 /* device interface */
1011 static struct acpi_video_device_attrib
*
1012 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1014 struct acpi_video_enumerated_device
*ids
;
1017 for (i
= 0; i
< video
->attached_count
; i
++) {
1018 ids
= &video
->attached_array
[i
];
1019 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1020 return &ids
->value
.attrib
;
1027 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1028 unsigned long device_id
)
1030 struct acpi_video_enumerated_device
*ids
;
1033 for (i
= 0; i
< video
->attached_count
; i
++) {
1034 ids
= &video
->attached_array
[i
];
1035 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1036 return ids
->value
.int_val
;
1043 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1044 struct acpi_video_bus
*video
)
1046 unsigned long long device_id
;
1047 int status
, device_type
;
1048 struct acpi_video_device
*data
;
1049 struct acpi_video_device_attrib
* attribute
;
1051 if (!device
|| !video
)
1055 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1056 if (ACPI_SUCCESS(status
)) {
1058 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1062 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1063 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1064 device
->driver_data
= data
;
1066 data
->device_id
= device_id
;
1067 data
->video
= video
;
1070 attribute
= acpi_video_get_device_attr(video
, device_id
);
1072 if((attribute
!= NULL
) && attribute
->device_id_scheme
) {
1073 switch (attribute
->display_type
) {
1074 case ACPI_VIDEO_DISPLAY_CRT
:
1075 data
->flags
.crt
= 1;
1077 case ACPI_VIDEO_DISPLAY_TV
:
1078 data
->flags
.tvout
= 1;
1080 case ACPI_VIDEO_DISPLAY_DVI
:
1081 data
->flags
.dvi
= 1;
1083 case ACPI_VIDEO_DISPLAY_LCD
:
1084 data
->flags
.lcd
= 1;
1087 data
->flags
.unknown
= 1;
1090 if(attribute
->bios_can_detect
)
1091 data
->flags
.bios
= 1;
1093 /* Check for legacy IDs */
1094 device_type
= acpi_video_get_device_type(video
,
1096 /* Ignore bits 16 and 18-20 */
1097 switch (device_type
& 0xffe2ffff) {
1098 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1099 data
->flags
.crt
= 1;
1101 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1102 data
->flags
.lcd
= 1;
1104 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1105 data
->flags
.tvout
= 1;
1108 data
->flags
.unknown
= 1;
1112 acpi_video_device_bind(video
, data
);
1113 acpi_video_device_find_cap(data
);
1115 status
= acpi_install_notify_handler(device
->handle
,
1117 acpi_video_device_notify
,
1119 if (ACPI_FAILURE(status
)) {
1120 printk(KERN_ERR PREFIX
1121 "Error installing notify handler\n");
1122 if(data
->brightness
)
1123 kfree(data
->brightness
->levels
);
1124 kfree(data
->brightness
);
1129 mutex_lock(&video
->device_list_lock
);
1130 list_add_tail(&data
->entry
, &video
->video_device_list
);
1131 mutex_unlock(&video
->device_list_lock
);
1141 * video : video bus device
1146 * Enumerate the video device list of the video bus,
1147 * bind the ids with the corresponding video devices
1148 * under the video bus.
1151 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1153 struct acpi_video_device
*dev
;
1155 mutex_lock(&video
->device_list_lock
);
1157 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1158 acpi_video_device_bind(video
, dev
);
1160 mutex_unlock(&video
->device_list_lock
);
1165 * video : video bus device
1166 * device : video output device under the video
1172 * Bind the ids with the corresponding video devices
1173 * under the video bus.
1177 acpi_video_device_bind(struct acpi_video_bus
*video
,
1178 struct acpi_video_device
*device
)
1180 struct acpi_video_enumerated_device
*ids
;
1183 for (i
= 0; i
< video
->attached_count
; i
++) {
1184 ids
= &video
->attached_array
[i
];
1185 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1186 ids
->bind_info
= device
;
1187 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1194 * video : video bus device
1199 * Call _DOD to enumerate all devices attached to display adapter
1203 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1208 struct acpi_video_enumerated_device
*active_list
;
1209 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1210 union acpi_object
*dod
= NULL
;
1211 union acpi_object
*obj
;
1213 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1214 if (!ACPI_SUCCESS(status
)) {
1215 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1219 dod
= buffer
.pointer
;
1220 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1221 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1226 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1227 dod
->package
.count
));
1229 active_list
= kcalloc(1 + dod
->package
.count
,
1230 sizeof(struct acpi_video_enumerated_device
),
1238 for (i
= 0; i
< dod
->package
.count
; i
++) {
1239 obj
= &dod
->package
.elements
[i
];
1241 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1242 printk(KERN_ERR PREFIX
1243 "Invalid _DOD data in element %d\n", i
);
1247 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1248 active_list
[count
].bind_info
= NULL
;
1249 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1250 (int)obj
->integer
.value
));
1254 kfree(video
->attached_array
);
1256 video
->attached_array
= active_list
;
1257 video
->attached_count
= count
;
1260 kfree(buffer
.pointer
);
1265 acpi_video_get_next_level(struct acpi_video_device
*device
,
1266 u32 level_current
, u32 event
)
1268 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1269 max
= max_below
= 0;
1270 min
= min_above
= 255;
1271 /* Find closest level to level_current */
1272 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1273 l
= device
->brightness
->levels
[i
];
1274 if (abs(l
- level_current
) < abs(delta
)) {
1275 delta
= l
- level_current
;
1280 /* Ajust level_current to closest available level */
1281 level_current
+= delta
;
1282 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1283 l
= device
->brightness
->levels
[i
];
1288 if (l
< min_above
&& l
> level_current
)
1290 if (l
> max_below
&& l
< level_current
)
1295 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1296 return (level_current
< max
) ? min_above
: min
;
1297 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1298 return (level_current
< max
) ? min_above
: max
;
1299 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1300 return (level_current
> min
) ? max_below
: min
;
1301 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1302 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1305 return level_current
;
1310 acpi_video_switch_brightness(struct acpi_video_device
*device
, int event
)
1312 unsigned long long level_current
, level_next
;
1313 int result
= -EINVAL
;
1315 /* no warning message if acpi_backlight=vendor is used */
1316 if (!acpi_video_backlight_support())
1319 if (!device
->brightness
)
1322 result
= acpi_video_device_lcd_get_level_current(device
,
1327 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1329 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1332 backlight_force_update(device
->backlight
,
1333 BACKLIGHT_UPDATE_HOTKEY
);
1337 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1342 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1345 struct acpi_video_bus
*video
;
1346 struct acpi_video_device
*video_device
;
1347 union acpi_object
*buffer
= NULL
;
1351 if (!device
|| !acpi_driver_data(device
))
1354 video
= acpi_driver_data(device
);
1356 for (i
= 0; i
< video
->attached_count
; i
++) {
1357 video_device
= video
->attached_array
[i
].bind_info
;
1365 case ACPI_VIDEO_DISPLAY_CRT
:
1366 if (!video_device
->flags
.crt
)
1369 case ACPI_VIDEO_DISPLAY_TV
:
1370 if (!video_device
->flags
.tvout
)
1373 case ACPI_VIDEO_DISPLAY_DVI
:
1374 if (!video_device
->flags
.dvi
)
1377 case ACPI_VIDEO_DISPLAY_LCD
:
1378 if (!video_device
->flags
.lcd
)
1382 } else if (video_device
->device_id
!= device_id
) {
1386 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1388 if (ACPI_FAILURE(status
) || !buffer
||
1389 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1391 status
= acpi_video_device_EDID(video_device
, &buffer
,
1393 if (ACPI_FAILURE(status
) || !buffer
||
1394 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1399 *edid
= buffer
->buffer
.pointer
;
1405 EXPORT_SYMBOL(acpi_video_get_edid
);
1408 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1409 struct acpi_device
*device
)
1412 struct acpi_device
*dev
;
1414 acpi_video_device_enumerate(video
);
1416 list_for_each_entry(dev
, &device
->children
, node
) {
1418 status
= acpi_video_bus_get_one_device(dev
, video
);
1419 if (ACPI_FAILURE(status
)) {
1420 printk(KERN_WARNING PREFIX
1421 "Cant attach device\n");
1428 static int acpi_video_bus_put_one_device(struct acpi_video_device
*device
)
1432 if (!device
|| !device
->video
)
1435 status
= acpi_remove_notify_handler(device
->dev
->handle
,
1437 acpi_video_device_notify
);
1438 if (ACPI_FAILURE(status
)) {
1439 printk(KERN_WARNING PREFIX
1440 "Cant remove video notify handler\n");
1442 if (device
->backlight
) {
1443 sysfs_remove_link(&device
->backlight
->dev
.kobj
, "device");
1444 backlight_device_unregister(device
->backlight
);
1445 device
->backlight
= NULL
;
1447 if (device
->cooling_dev
) {
1448 sysfs_remove_link(&device
->dev
->dev
.kobj
,
1450 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
,
1452 thermal_cooling_device_unregister(device
->cooling_dev
);
1453 device
->cooling_dev
= NULL
;
1455 video_output_unregister(device
->output_dev
);
1460 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1463 struct acpi_video_device
*dev
, *next
;
1465 mutex_lock(&video
->device_list_lock
);
1467 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1469 status
= acpi_video_bus_put_one_device(dev
);
1470 if (ACPI_FAILURE(status
))
1471 printk(KERN_WARNING PREFIX
1472 "hhuuhhuu bug in acpi video driver.\n");
1474 if (dev
->brightness
) {
1475 kfree(dev
->brightness
->levels
);
1476 kfree(dev
->brightness
);
1478 list_del(&dev
->entry
);
1482 mutex_unlock(&video
->device_list_lock
);
1487 /* acpi_video interface */
1489 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1491 return acpi_video_bus_DOS(video
, 0, 0);
1494 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1496 return acpi_video_bus_DOS(video
, 0, 1);
1499 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1501 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1502 struct input_dev
*input
;
1508 input
= video
->input
;
1511 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1512 * most likely via hotkey. */
1513 acpi_bus_generate_proc_event(device
, event
, 0);
1514 keycode
= KEY_SWITCHVIDEOMODE
;
1517 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1519 acpi_video_device_enumerate(video
);
1520 acpi_video_device_rebind(video
);
1521 acpi_bus_generate_proc_event(device
, event
, 0);
1522 keycode
= KEY_SWITCHVIDEOMODE
;
1525 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1526 acpi_bus_generate_proc_event(device
, event
, 0);
1527 keycode
= KEY_SWITCHVIDEOMODE
;
1529 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1530 acpi_bus_generate_proc_event(device
, event
, 0);
1531 keycode
= KEY_VIDEO_NEXT
;
1533 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1534 acpi_bus_generate_proc_event(device
, event
, 0);
1535 keycode
= KEY_VIDEO_PREV
;
1539 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1540 "Unsupported event [0x%x]\n", event
));
1544 acpi_notifier_call_chain(device
, event
, 0);
1547 input_report_key(input
, keycode
, 1);
1549 input_report_key(input
, keycode
, 0);
1556 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1558 struct acpi_video_device
*video_device
= data
;
1559 struct acpi_device
*device
= NULL
;
1560 struct acpi_video_bus
*bus
;
1561 struct input_dev
*input
;
1567 device
= video_device
->dev
;
1568 bus
= video_device
->video
;
1572 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1573 if (brightness_switch_enabled
)
1574 acpi_video_switch_brightness(video_device
, event
);
1575 acpi_bus_generate_proc_event(device
, event
, 0);
1576 keycode
= KEY_BRIGHTNESS_CYCLE
;
1578 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1579 if (brightness_switch_enabled
)
1580 acpi_video_switch_brightness(video_device
, event
);
1581 acpi_bus_generate_proc_event(device
, event
, 0);
1582 keycode
= KEY_BRIGHTNESSUP
;
1584 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1585 if (brightness_switch_enabled
)
1586 acpi_video_switch_brightness(video_device
, event
);
1587 acpi_bus_generate_proc_event(device
, event
, 0);
1588 keycode
= KEY_BRIGHTNESSDOWN
;
1590 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightnesss */
1591 if (brightness_switch_enabled
)
1592 acpi_video_switch_brightness(video_device
, event
);
1593 acpi_bus_generate_proc_event(device
, event
, 0);
1594 keycode
= KEY_BRIGHTNESS_ZERO
;
1596 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1597 if (brightness_switch_enabled
)
1598 acpi_video_switch_brightness(video_device
, event
);
1599 acpi_bus_generate_proc_event(device
, event
, 0);
1600 keycode
= KEY_DISPLAY_OFF
;
1603 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1604 "Unsupported event [0x%x]\n", event
));
1608 acpi_notifier_call_chain(device
, event
, 0);
1611 input_report_key(input
, keycode
, 1);
1613 input_report_key(input
, keycode
, 0);
1620 static int acpi_video_resume(struct notifier_block
*nb
,
1621 unsigned long val
, void *ign
)
1623 struct acpi_video_bus
*video
;
1624 struct acpi_video_device
*video_device
;
1628 case PM_HIBERNATION_PREPARE
:
1629 case PM_SUSPEND_PREPARE
:
1630 case PM_RESTORE_PREPARE
:
1634 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1636 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1638 for (i
= 0; i
< video
->attached_count
; i
++) {
1639 video_device
= video
->attached_array
[i
].bind_info
;
1640 if (video_device
&& video_device
->backlight
)
1641 acpi_video_set_brightness(video_device
->backlight
);
1648 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1649 void **return_value
)
1651 struct acpi_device
*device
= context
;
1652 struct acpi_device
*sibling
;
1655 if (handle
== device
->handle
)
1656 return AE_CTRL_TERMINATE
;
1658 result
= acpi_bus_get_device(handle
, &sibling
);
1662 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1663 return AE_ALREADY_EXISTS
;
1668 static int instance
;
1670 static int acpi_video_bus_add(struct acpi_device
*device
)
1672 struct acpi_video_bus
*video
;
1673 struct input_dev
*input
;
1677 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1678 device
->parent
->handle
, 1,
1679 acpi_video_bus_match
, NULL
,
1681 if (status
== AE_ALREADY_EXISTS
) {
1682 printk(KERN_WARNING FW_BUG
1683 "Duplicate ACPI video bus devices for the"
1684 " same VGA controller, please try module "
1685 "parameter \"video.allow_duplicates=1\""
1686 "if the current driver doesn't work.\n");
1687 if (!allow_duplicates
)
1691 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1695 /* a hack to fix the duplicate name "VID" problem on T61 */
1696 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1698 device
->pnp
.bus_id
[3] = '0' + instance
;
1701 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1702 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1704 device
->pnp
.bus_id
[3] = '0' + instance
;
1708 video
->device
= device
;
1709 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1710 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1711 device
->driver_data
= video
;
1713 acpi_video_bus_find_cap(video
);
1714 error
= acpi_video_bus_check(video
);
1716 goto err_free_video
;
1718 mutex_init(&video
->device_list_lock
);
1719 INIT_LIST_HEAD(&video
->video_device_list
);
1721 acpi_video_bus_get_devices(video
, device
);
1722 acpi_video_bus_start_devices(video
);
1724 video
->input
= input
= input_allocate_device();
1727 goto err_stop_video
;
1730 snprintf(video
->phys
, sizeof(video
->phys
),
1731 "%s/video/input0", acpi_device_hid(video
->device
));
1733 input
->name
= acpi_device_name(video
->device
);
1734 input
->phys
= video
->phys
;
1735 input
->id
.bustype
= BUS_HOST
;
1736 input
->id
.product
= 0x06;
1737 input
->dev
.parent
= &device
->dev
;
1738 input
->evbit
[0] = BIT(EV_KEY
);
1739 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1740 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1741 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1742 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1743 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1744 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1745 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1746 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1748 error
= input_register_device(input
);
1750 goto err_free_input_dev
;
1752 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1753 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1754 video
->flags
.multihead
? "yes" : "no",
1755 video
->flags
.rom
? "yes" : "no",
1756 video
->flags
.post
? "yes" : "no");
1758 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1759 video
->pm_nb
.priority
= 0;
1760 register_pm_notifier(&video
->pm_nb
);
1765 input_free_device(input
);
1767 acpi_video_bus_stop_devices(video
);
1768 acpi_video_bus_put_devices(video
);
1769 kfree(video
->attached_array
);
1772 device
->driver_data
= NULL
;
1777 static int acpi_video_bus_remove(struct acpi_device
*device
, int type
)
1779 struct acpi_video_bus
*video
= NULL
;
1782 if (!device
|| !acpi_driver_data(device
))
1785 video
= acpi_driver_data(device
);
1787 unregister_pm_notifier(&video
->pm_nb
);
1789 acpi_video_bus_stop_devices(video
);
1790 acpi_video_bus_put_devices(video
);
1792 input_unregister_device(video
->input
);
1793 kfree(video
->attached_array
);
1799 static int __init
intel_opregion_present(void)
1801 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1802 struct pci_dev
*dev
= NULL
;
1805 for_each_pci_dev(dev
) {
1806 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1808 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
1810 pci_read_config_dword(dev
, 0xfc, &address
);
1819 int acpi_video_register(void)
1822 if (register_count
) {
1824 * if the function of acpi_video_register is already called,
1825 * don't register the acpi_vide_bus again and return no error.
1830 result
= acpi_bus_register_driver(&acpi_video_bus
);
1835 * When the acpi_video_bus is loaded successfully, increase
1836 * the counter reference.
1842 EXPORT_SYMBOL(acpi_video_register
);
1844 void acpi_video_unregister(void)
1846 if (!register_count
) {
1848 * If the acpi video bus is already unloaded, don't
1849 * unload it again and return directly.
1853 acpi_bus_unregister_driver(&acpi_video_bus
);
1859 EXPORT_SYMBOL(acpi_video_unregister
);
1862 * This is kind of nasty. Hardware using Intel chipsets may require
1863 * the video opregion code to be run first in order to initialise
1864 * state before any ACPI video calls are made. To handle this we defer
1865 * registration of the video class until the opregion code has run.
1868 static int __init
acpi_video_init(void)
1870 dmi_check_system(video_dmi_table
);
1872 if (intel_opregion_present())
1875 return acpi_video_register();
1878 static void __exit
acpi_video_exit(void)
1880 acpi_video_unregister();
1885 module_init(acpi_video_init
);
1886 module_exit(acpi_video_exit
);