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>
47 #define PREFIX "ACPI: "
49 #define ACPI_VIDEO_BUS_NAME "Video Bus"
50 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
51 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
52 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
53 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63 #define MAX_NAME_LEN 20
65 #define _COMPONENT ACPI_VIDEO_COMPONENT
66 ACPI_MODULE_NAME("video");
68 MODULE_AUTHOR("Bruno Ducrot");
69 MODULE_DESCRIPTION("ACPI Video Driver");
70 MODULE_LICENSE("GPL");
72 static bool brightness_switch_enabled
= 1;
73 module_param(brightness_switch_enabled
, bool, 0644);
76 * By default, we don't allow duplicate ACPI video bus devices
77 * under the same VGA controller
79 static bool allow_duplicates
;
80 module_param(allow_duplicates
, bool, 0644);
83 * Some BIOSes claim they use minimum backlight at boot,
84 * and this may bring dimming screen after boot
86 static bool use_bios_initial_backlight
= 1;
87 module_param(use_bios_initial_backlight
, bool, 0644);
89 static int register_count
= 0;
90 static int acpi_video_bus_add(struct acpi_device
*device
);
91 static int acpi_video_bus_remove(struct acpi_device
*device
);
92 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
94 static const struct acpi_device_id video_device_ids
[] = {
98 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
100 static struct acpi_driver acpi_video_bus
= {
102 .class = ACPI_VIDEO_CLASS
,
103 .ids
= video_device_ids
,
105 .add
= acpi_video_bus_add
,
106 .remove
= acpi_video_bus_remove
,
107 .notify
= acpi_video_bus_notify
,
111 struct acpi_video_bus_flags
{
112 u8 multihead
:1; /* can switch video heads */
113 u8 rom
:1; /* can retrieve a video rom */
114 u8 post
:1; /* can configure the head to */
118 struct acpi_video_bus_cap
{
119 u8 _DOS
:1; /*Enable/Disable output switching */
120 u8 _DOD
:1; /*Enumerate all devices attached to display adapter */
121 u8 _ROM
:1; /*Get ROM Data */
122 u8 _GPD
:1; /*Get POST Device */
123 u8 _SPD
:1; /*Set POST Device */
124 u8 _VPO
:1; /*Video POST Options */
128 struct acpi_video_device_attrib
{
129 u32 display_index
:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment
:4; /*This field differentiates the display type */
131 u32 display_type
:4; /*Describe the specific type in use */
132 u32 vendor_specific
:4; /*Chipset Vendor Specific */
133 u32 bios_can_detect
:1; /*BIOS can detect the device */
134 u32 depend_on_vga
:1; /*Non-VGA output device whose power is related to
136 u32 pipe_id
:3; /*For VGA multiple-head devices. */
137 u32 reserved
:10; /*Must be 0 */
138 u32 device_id_scheme
:1; /*Device ID Scheme */
141 struct acpi_video_enumerated_device
{
144 struct acpi_video_device_attrib attrib
;
146 struct acpi_video_device
*bind_info
;
149 struct acpi_video_bus
{
150 struct acpi_device
*device
;
152 struct acpi_video_enumerated_device
*attached_array
;
154 struct acpi_video_bus_cap cap
;
155 struct acpi_video_bus_flags flags
;
156 struct list_head video_device_list
;
157 struct mutex device_list_lock
; /* protects video_device_list */
158 struct input_dev
*input
;
159 char phys
[32]; /* for input device */
160 struct notifier_block pm_nb
;
163 struct acpi_video_device_flags
{
174 struct acpi_video_device_cap
{
175 u8 _ADR
:1; /*Return the unique ID */
176 u8 _BCL
:1; /*Query list of brightness control levels supported */
177 u8 _BCM
:1; /*Set the brightness level */
178 u8 _BQC
:1; /* Get current brightness level */
179 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC
:1; /*Return the EDID for this device */
183 struct acpi_video_brightness_flags
{
184 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
185 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order*/
186 u8 _BCL_use_index
:1; /* levels in _BCL are index values */
187 u8 _BCM_use_index
:1; /* input of _BCM is an index value */
188 u8 _BQC_use_index
:1; /* _BQC returns an index value */
191 struct acpi_video_device_brightness
{
195 struct acpi_video_brightness_flags flags
;
198 struct acpi_video_device
{
199 unsigned long device_id
;
200 struct acpi_video_device_flags flags
;
201 struct acpi_video_device_cap cap
;
202 struct list_head entry
;
203 struct acpi_video_bus
*video
;
204 struct acpi_device
*dev
;
205 struct acpi_video_device_brightness
*brightness
;
206 struct backlight_device
*backlight
;
207 struct thermal_cooling_device
*cooling_dev
;
210 static const char device_decode
[][30] = {
211 "motherboard VGA device",
217 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
218 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
219 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
220 struct acpi_video_device
*device
);
221 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
224 static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device
*device
,
226 unsigned long long *level
, bool raw
);
227 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
228 u32 level_current
, u32 event
);
229 static int acpi_video_switch_brightness(struct acpi_video_device
*device
,
232 /*backlight device sysfs support*/
233 static int acpi_video_get_brightness(struct backlight_device
*bd
)
235 unsigned long long cur_level
;
237 struct acpi_video_device
*vd
=
238 (struct acpi_video_device
*)bl_get_data(bd
);
240 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
242 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
243 if (vd
->brightness
->levels
[i
] == cur_level
)
244 /* The first two entries are special - see page 575
245 of the ACPI spec 3.0 */
251 static int acpi_video_set_brightness(struct backlight_device
*bd
)
253 int request_level
= bd
->props
.brightness
+ 2;
254 struct acpi_video_device
*vd
=
255 (struct acpi_video_device
*)bl_get_data(bd
);
257 return acpi_video_device_lcd_set_level(vd
,
258 vd
->brightness
->levels
[request_level
]);
261 static const struct backlight_ops acpi_backlight_ops
= {
262 .get_brightness
= acpi_video_get_brightness
,
263 .update_status
= acpi_video_set_brightness
,
266 /* thermal cooling device callbacks */
267 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
270 struct acpi_device
*device
= cooling_dev
->devdata
;
271 struct acpi_video_device
*video
= acpi_driver_data(device
);
273 *state
= video
->brightness
->count
- 3;
277 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
280 struct acpi_device
*device
= cooling_dev
->devdata
;
281 struct acpi_video_device
*video
= acpi_driver_data(device
);
282 unsigned long long level
;
285 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
287 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
288 if (level
== video
->brightness
->levels
[offset
]) {
289 *state
= video
->brightness
->count
- offset
- 1;
297 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
299 struct acpi_device
*device
= cooling_dev
->devdata
;
300 struct acpi_video_device
*video
= acpi_driver_data(device
);
303 if ( state
>= video
->brightness
->count
- 2)
306 state
= video
->brightness
->count
- state
;
307 level
= video
->brightness
->levels
[state
-1];
308 return acpi_video_device_lcd_set_level(video
, level
);
311 static const struct thermal_cooling_device_ops video_cooling_ops
= {
312 .get_max_state
= video_get_max_state
,
313 .get_cur_state
= video_get_cur_state
,
314 .set_cur_state
= video_set_cur_state
,
317 /* --------------------------------------------------------------------------
319 -------------------------------------------------------------------------- */
322 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
323 union acpi_object
**levels
)
326 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
327 union acpi_object
*obj
;
332 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
333 if (!ACPI_SUCCESS(status
))
335 obj
= (union acpi_object
*)buffer
.pointer
;
336 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
337 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
347 kfree(buffer
.pointer
);
353 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
356 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
357 struct acpi_object_list args
= { 1, &arg0
};
360 arg0
.integer
.value
= level
;
362 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCM",
364 if (ACPI_FAILURE(status
)) {
365 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
369 device
->brightness
->curr
= level
;
370 for (state
= 2; state
< device
->brightness
->count
; state
++)
371 if (level
== device
->brightness
->levels
[state
]) {
372 if (device
->backlight
)
373 device
->backlight
->props
.brightness
= state
- 2;
377 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
382 * For some buggy _BQC methods, we need to add a constant value to
383 * the _BQC return value to get the actual current brightness level
386 static int bqc_offset_aml_bug_workaround
;
387 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
389 bqc_offset_aml_bug_workaround
= 9;
393 static int video_ignore_initial_backlight(const struct dmi_system_id
*d
)
395 use_bios_initial_backlight
= 0;
399 static struct dmi_system_id video_dmi_table
[] __initdata
= {
401 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
404 .callback
= video_set_bqc_offset
,
405 .ident
= "Acer Aspire 5720",
407 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
408 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
412 .callback
= video_set_bqc_offset
,
413 .ident
= "Acer Aspire 5710Z",
415 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
416 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
420 .callback
= video_set_bqc_offset
,
421 .ident
= "eMachines E510",
423 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
424 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
428 .callback
= video_set_bqc_offset
,
429 .ident
= "Acer Aspire 5315",
431 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
436 .callback
= video_set_bqc_offset
,
437 .ident
= "Acer Aspire 7720",
439 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
440 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
444 .callback
= video_ignore_initial_backlight
,
445 .ident
= "HP Folio 13-2000",
447 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
448 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Folio 13 - 2000 Notebook PC"),
452 .callback
= video_ignore_initial_backlight
,
453 .ident
= "HP Pavilion dm4",
455 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
456 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Pavilion dm4 Notebook PC"),
460 .callback
= video_ignore_initial_backlight
,
461 .ident
= "HP 1000 Notebook PC",
463 DMI_MATCH(DMI_BOARD_VENDOR
, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME
, "HP 1000 Notebook PC"),
470 static unsigned long long
471 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
472 unsigned long long bqc_value
)
474 unsigned long long level
;
476 if (device
->brightness
->flags
._BQC_use_index
) {
478 * _BQC returns an index that doesn't account for
479 * the first 2 items with special meaning, so we need
480 * to compensate for that by offsetting ourselves
482 if (device
->brightness
->flags
._BCL_reversed
)
483 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
485 level
= device
->brightness
->levels
[bqc_value
+ 2];
490 level
+= bqc_offset_aml_bug_workaround
;
496 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
497 unsigned long long *level
, bool raw
)
499 acpi_status status
= AE_OK
;
502 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
503 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
505 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
507 if (ACPI_SUCCESS(status
)) {
510 * Caller has indicated he wants the raw
511 * value returned by _BQC, so don't furtherly
512 * mess with the value.
517 *level
= acpi_video_bqc_value_to_level(device
, *level
);
519 for (i
= 2; i
< device
->brightness
->count
; i
++)
520 if (device
->brightness
->levels
[i
] == *level
) {
521 device
->brightness
->curr
= *level
;
525 * BQC returned an invalid level.
528 ACPI_WARNING((AE_INFO
,
529 "%s returned an invalid level",
531 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
534 * should we return an error or ignore this failure?
535 * dev->brightness->curr is a cached value which stores
536 * the correct current backlight level in most cases.
537 * ACPI video backlight still works w/ buggy _BQC.
538 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
540 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
541 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
545 *level
= device
->brightness
->curr
;
550 acpi_video_device_EDID(struct acpi_video_device
*device
,
551 union acpi_object
**edid
, ssize_t length
)
554 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
555 union acpi_object
*obj
;
556 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
557 struct acpi_object_list args
= { 1, &arg0
};
565 arg0
.integer
.value
= 1;
566 else if (length
== 256)
567 arg0
.integer
.value
= 2;
571 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
572 if (ACPI_FAILURE(status
))
575 obj
= buffer
.pointer
;
577 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
580 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
592 * video : video bus device pointer
594 * 0. The system BIOS should NOT automatically switch(toggle)
595 * the active display output.
596 * 1. The system BIOS should automatically switch (toggle) the
597 * active display output. No switch event.
598 * 2. The _DGS value should be locked.
599 * 3. The system BIOS should not automatically switch (toggle) the
600 * active display output, but instead generate the display switch
603 * 0. The system BIOS should automatically control the brightness level
604 * of the LCD when the power changes from AC to DC
605 * 1. The system BIOS should NOT automatically control the brightness
606 * level of the LCD when the power changes from AC to DC.
612 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
615 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
616 struct acpi_object_list args
= { 1, &arg0
};
618 if (!video
->cap
._DOS
)
621 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
623 arg0
.integer
.value
= (lcd_flag
<< 2) | bios_flag
;
624 video
->dos_setting
= arg0
.integer
.value
;
625 status
= acpi_evaluate_object(video
->device
->handle
, "_DOS",
627 if (ACPI_FAILURE(status
))
634 * Simple comparison function used to sort backlight levels.
638 acpi_video_cmp_level(const void *a
, const void *b
)
640 return *(int *)a
- *(int *)b
;
644 * Decides if _BQC/_BCQ for this system is usable
646 * We do this by changing the level first and then read out the current
647 * brightness level, if the value does not match, find out if it is using
648 * index. If not, clear the _BQC/_BCQ capability.
650 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
651 int max_level
, int current_level
)
653 struct acpi_video_device_brightness
*br
= device
->brightness
;
655 unsigned long long level
;
658 /* don't mess with existing known broken systems */
659 if (bqc_offset_aml_bug_workaround
)
663 * Some systems always report current brightness level as maximum
664 * through _BQC, we need to test another value for them.
666 test_level
= current_level
== max_level
? br
->levels
[2] : max_level
;
668 result
= acpi_video_device_lcd_set_level(device
, test_level
);
672 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
676 if (level
!= test_level
) {
677 /* buggy _BQC found, need to find out if it uses index */
678 if (level
< br
->count
) {
679 if (br
->flags
._BCL_reversed
)
680 level
= br
->count
- 3 - level
;
681 if (br
->levels
[level
+ 2] == test_level
)
682 br
->flags
._BQC_use_index
= 1;
685 if (!br
->flags
._BQC_use_index
)
686 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
695 * device : video output device (LCD, CRT, ..)
698 * Maximum brightness level
700 * Allocate and initialize device->brightness.
704 acpi_video_init_brightness(struct acpi_video_device
*device
)
706 union acpi_object
*obj
= NULL
;
707 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
708 unsigned long long level
, level_old
;
709 union acpi_object
*o
;
710 struct acpi_video_device_brightness
*br
= NULL
;
711 int result
= -EINVAL
;
713 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
714 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
715 "LCD brightness level\n"));
719 if (obj
->package
.count
< 2)
722 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
724 printk(KERN_ERR
"can't allocate memory\n");
729 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
736 for (i
= 0; i
< obj
->package
.count
; i
++) {
737 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
738 if (o
->type
!= ACPI_TYPE_INTEGER
) {
739 printk(KERN_ERR PREFIX
"Invalid data\n");
742 br
->levels
[count
] = (u32
) o
->integer
.value
;
744 if (br
->levels
[count
] > max_level
)
745 max_level
= br
->levels
[count
];
750 * some buggy BIOS don't export the levels
751 * when machine is on AC/Battery in _BCL package.
752 * In this case, the first two elements in _BCL packages
753 * are also supported brightness levels that OS should take care of.
755 for (i
= 2; i
< count
; i
++) {
756 if (br
->levels
[i
] == br
->levels
[0])
758 if (br
->levels
[i
] == br
->levels
[1])
762 if (level_ac_battery
< 2) {
763 level_ac_battery
= 2 - level_ac_battery
;
764 br
->flags
._BCL_no_ac_battery_levels
= 1;
765 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
766 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
767 count
+= level_ac_battery
;
768 } else if (level_ac_battery
> 2)
769 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
771 /* Check if the _BCL package is in a reversed order */
772 if (max_level
== br
->levels
[2]) {
773 br
->flags
._BCL_reversed
= 1;
774 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
775 acpi_video_cmp_level
, NULL
);
776 } else if (max_level
!= br
->levels
[count
- 1])
778 "Found unordered _BCL package"));
781 device
->brightness
= br
;
783 /* Check the input/output of _BQC/_BCL/_BCM */
784 if ((max_level
< 100) && (max_level
<= (count
- 2)))
785 br
->flags
._BCL_use_index
= 1;
788 * _BCM is always consistent with _BCL,
789 * at least for all the laptops we have ever seen.
791 br
->flags
._BCM_use_index
= br
->flags
._BCL_use_index
;
793 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
794 br
->curr
= level
= max_level
;
796 if (!device
->cap
._BQC
)
799 result
= acpi_video_device_lcd_get_level_current(device
,
802 goto out_free_levels
;
804 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
806 goto out_free_levels
;
808 * cap._BQC may get cleared due to _BQC is found to be broken
809 * in acpi_video_bqc_quirk, so check again here.
811 if (!device
->cap
._BQC
)
814 if (use_bios_initial_backlight
) {
815 level
= acpi_video_bqc_value_to_level(device
, level_old
);
817 * On some buggy laptops, _BQC returns an uninitialized
818 * value when invoked for the first time, i.e.
819 * level_old is invalid (no matter whether it's a level
820 * or an index). Set the backlight to max_level in this case.
822 for (i
= 2; i
< br
->count
; i
++)
823 if (level_old
== br
->levels
[i
])
830 result
= acpi_video_device_lcd_set_level(device
, level
);
832 goto out_free_levels
;
834 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
835 "found %d brightness levels\n", count
- 2));
844 device
->brightness
= NULL
;
851 * device : video output device (LCD, CRT, ..)
856 * Find out all required AML methods defined under the output
860 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
862 acpi_handle h_dummy1
;
864 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_ADR", &h_dummy1
))) {
865 device
->cap
._ADR
= 1;
867 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCL", &h_dummy1
))) {
868 device
->cap
._BCL
= 1;
870 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCM", &h_dummy1
))) {
871 device
->cap
._BCM
= 1;
873 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
,"_BQC",&h_dummy1
)))
874 device
->cap
._BQC
= 1;
875 else if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_BCQ",
877 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
878 device
->cap
._BCQ
= 1;
881 if (ACPI_SUCCESS(acpi_get_handle(device
->dev
->handle
, "_DDC", &h_dummy1
))) {
882 device
->cap
._DDC
= 1;
885 if (acpi_video_backlight_support()) {
886 struct backlight_properties props
;
887 struct pci_dev
*pdev
;
888 acpi_handle acpi_parent
;
889 struct device
*parent
= NULL
;
891 static int count
= 0;
894 result
= acpi_video_init_brightness(device
);
897 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
902 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
904 pdev
= acpi_get_pci_dev(acpi_parent
);
910 memset(&props
, 0, sizeof(struct backlight_properties
));
911 props
.type
= BACKLIGHT_FIRMWARE
;
912 props
.max_brightness
= device
->brightness
->count
- 3;
913 device
->backlight
= backlight_device_register(name
,
919 if (IS_ERR(device
->backlight
))
923 * Save current brightness level in case we have to restore it
924 * before acpi_video_device_lcd_set_level() is called next time.
926 device
->backlight
->props
.brightness
=
927 acpi_video_get_brightness(device
->backlight
);
929 device
->cooling_dev
= thermal_cooling_device_register("LCD",
930 device
->dev
, &video_cooling_ops
);
931 if (IS_ERR(device
->cooling_dev
)) {
933 * Set cooling_dev to NULL so we don't crash trying to
935 * Also, why the hell we are returning early and
936 * not attempt to register video output if cooling
937 * device registration failed?
940 device
->cooling_dev
= NULL
;
944 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
945 device
->cooling_dev
->id
);
946 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
947 &device
->cooling_dev
->device
.kobj
,
950 printk(KERN_ERR PREFIX
"Create sysfs link\n");
951 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
952 &device
->dev
->dev
.kobj
, "device");
954 printk(KERN_ERR PREFIX
"Create sysfs link\n");
961 * device : video output device (VGA)
966 * Find out all required AML methods defined under the video bus device.
969 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
971 acpi_handle h_dummy1
;
973 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOS", &h_dummy1
))) {
976 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_DOD", &h_dummy1
))) {
979 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_ROM", &h_dummy1
))) {
982 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_GPD", &h_dummy1
))) {
985 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_SPD", &h_dummy1
))) {
988 if (ACPI_SUCCESS(acpi_get_handle(video
->device
->handle
, "_VPO", &h_dummy1
))) {
994 * Check whether the video bus device has required AML method to
995 * support the desired features
998 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
1000 acpi_status status
= -ENOENT
;
1001 struct pci_dev
*dev
;
1006 dev
= acpi_get_pci_dev(video
->device
->handle
);
1011 /* Since there is no HID, CID and so on for VGA driver, we have
1012 * to check well known required nodes.
1015 /* Does this device support video switching? */
1016 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1017 if (!video
->cap
._DOS
) {
1018 printk(KERN_WARNING FW_BUG
1019 "ACPI(%s) defines _DOD but not _DOS\n",
1020 acpi_device_bid(video
->device
));
1022 video
->flags
.multihead
= 1;
1026 /* Does this device support retrieving a video ROM? */
1027 if (video
->cap
._ROM
) {
1028 video
->flags
.rom
= 1;
1032 /* Does this device support configuring which video device to POST? */
1033 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1034 video
->flags
.post
= 1;
1041 /* --------------------------------------------------------------------------
1043 -------------------------------------------------------------------------- */
1045 /* device interface */
1046 static struct acpi_video_device_attrib
*
1047 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1049 struct acpi_video_enumerated_device
*ids
;
1052 for (i
= 0; i
< video
->attached_count
; i
++) {
1053 ids
= &video
->attached_array
[i
];
1054 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1055 return &ids
->value
.attrib
;
1062 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1063 unsigned long device_id
)
1065 struct acpi_video_enumerated_device
*ids
;
1068 for (i
= 0; i
< video
->attached_count
; i
++) {
1069 ids
= &video
->attached_array
[i
];
1070 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1071 return ids
->value
.int_val
;
1078 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1079 struct acpi_video_bus
*video
)
1081 unsigned long long device_id
;
1082 int status
, device_type
;
1083 struct acpi_video_device
*data
;
1084 struct acpi_video_device_attrib
* attribute
;
1087 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1088 /* Some device omits _ADR, we skip them instead of fail */
1089 if (ACPI_FAILURE(status
))
1092 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1096 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1097 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1098 device
->driver_data
= data
;
1100 data
->device_id
= device_id
;
1101 data
->video
= video
;
1104 attribute
= acpi_video_get_device_attr(video
, device_id
);
1106 if((attribute
!= NULL
) && attribute
->device_id_scheme
) {
1107 switch (attribute
->display_type
) {
1108 case ACPI_VIDEO_DISPLAY_CRT
:
1109 data
->flags
.crt
= 1;
1111 case ACPI_VIDEO_DISPLAY_TV
:
1112 data
->flags
.tvout
= 1;
1114 case ACPI_VIDEO_DISPLAY_DVI
:
1115 data
->flags
.dvi
= 1;
1117 case ACPI_VIDEO_DISPLAY_LCD
:
1118 data
->flags
.lcd
= 1;
1121 data
->flags
.unknown
= 1;
1124 if(attribute
->bios_can_detect
)
1125 data
->flags
.bios
= 1;
1127 /* Check for legacy IDs */
1128 device_type
= acpi_video_get_device_type(video
, device_id
);
1129 /* Ignore bits 16 and 18-20 */
1130 switch (device_type
& 0xffe2ffff) {
1131 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1132 data
->flags
.crt
= 1;
1134 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1135 data
->flags
.lcd
= 1;
1137 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1138 data
->flags
.tvout
= 1;
1141 data
->flags
.unknown
= 1;
1145 acpi_video_device_bind(video
, data
);
1146 acpi_video_device_find_cap(data
);
1148 status
= acpi_install_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
1149 acpi_video_device_notify
, data
);
1150 if (ACPI_FAILURE(status
))
1151 dev_err(&device
->dev
, "Error installing notify handler\n");
1153 data
->flags
.notify
= 1;
1155 mutex_lock(&video
->device_list_lock
);
1156 list_add_tail(&data
->entry
, &video
->video_device_list
);
1157 mutex_unlock(&video
->device_list_lock
);
1164 * video : video bus device
1169 * Enumerate the video device list of the video bus,
1170 * bind the ids with the corresponding video devices
1171 * under the video bus.
1174 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1176 struct acpi_video_device
*dev
;
1178 mutex_lock(&video
->device_list_lock
);
1180 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1181 acpi_video_device_bind(video
, dev
);
1183 mutex_unlock(&video
->device_list_lock
);
1188 * video : video bus device
1189 * device : video output device under the video
1195 * Bind the ids with the corresponding video devices
1196 * under the video bus.
1200 acpi_video_device_bind(struct acpi_video_bus
*video
,
1201 struct acpi_video_device
*device
)
1203 struct acpi_video_enumerated_device
*ids
;
1206 for (i
= 0; i
< video
->attached_count
; i
++) {
1207 ids
= &video
->attached_array
[i
];
1208 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1209 ids
->bind_info
= device
;
1210 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1217 * video : video bus device
1222 * Call _DOD to enumerate all devices attached to display adapter
1226 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1231 struct acpi_video_enumerated_device
*active_list
;
1232 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1233 union acpi_object
*dod
= NULL
;
1234 union acpi_object
*obj
;
1236 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1237 if (!ACPI_SUCCESS(status
)) {
1238 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1242 dod
= buffer
.pointer
;
1243 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1244 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1249 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1250 dod
->package
.count
));
1252 active_list
= kcalloc(1 + dod
->package
.count
,
1253 sizeof(struct acpi_video_enumerated_device
),
1261 for (i
= 0; i
< dod
->package
.count
; i
++) {
1262 obj
= &dod
->package
.elements
[i
];
1264 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1265 printk(KERN_ERR PREFIX
1266 "Invalid _DOD data in element %d\n", i
);
1270 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1271 active_list
[count
].bind_info
= NULL
;
1272 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1273 (int)obj
->integer
.value
));
1277 kfree(video
->attached_array
);
1279 video
->attached_array
= active_list
;
1280 video
->attached_count
= count
;
1283 kfree(buffer
.pointer
);
1288 acpi_video_get_next_level(struct acpi_video_device
*device
,
1289 u32 level_current
, u32 event
)
1291 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1292 max
= max_below
= 0;
1293 min
= min_above
= 255;
1294 /* Find closest level to level_current */
1295 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1296 l
= device
->brightness
->levels
[i
];
1297 if (abs(l
- level_current
) < abs(delta
)) {
1298 delta
= l
- level_current
;
1303 /* Ajust level_current to closest available level */
1304 level_current
+= delta
;
1305 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1306 l
= device
->brightness
->levels
[i
];
1311 if (l
< min_above
&& l
> level_current
)
1313 if (l
> max_below
&& l
< level_current
)
1318 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1319 return (level_current
< max
) ? min_above
: min
;
1320 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1321 return (level_current
< max
) ? min_above
: max
;
1322 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1323 return (level_current
> min
) ? max_below
: min
;
1324 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1325 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1328 return level_current
;
1333 acpi_video_switch_brightness(struct acpi_video_device
*device
, int event
)
1335 unsigned long long level_current
, level_next
;
1336 int result
= -EINVAL
;
1338 /* no warning message if acpi_backlight=vendor is used */
1339 if (!acpi_video_backlight_support())
1342 if (!device
->brightness
)
1345 result
= acpi_video_device_lcd_get_level_current(device
,
1351 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1353 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1356 backlight_force_update(device
->backlight
,
1357 BACKLIGHT_UPDATE_HOTKEY
);
1361 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1366 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1369 struct acpi_video_bus
*video
;
1370 struct acpi_video_device
*video_device
;
1371 union acpi_object
*buffer
= NULL
;
1375 if (!device
|| !acpi_driver_data(device
))
1378 video
= acpi_driver_data(device
);
1380 for (i
= 0; i
< video
->attached_count
; i
++) {
1381 video_device
= video
->attached_array
[i
].bind_info
;
1387 if (!video_device
->cap
._DDC
)
1392 case ACPI_VIDEO_DISPLAY_CRT
:
1393 if (!video_device
->flags
.crt
)
1396 case ACPI_VIDEO_DISPLAY_TV
:
1397 if (!video_device
->flags
.tvout
)
1400 case ACPI_VIDEO_DISPLAY_DVI
:
1401 if (!video_device
->flags
.dvi
)
1404 case ACPI_VIDEO_DISPLAY_LCD
:
1405 if (!video_device
->flags
.lcd
)
1409 } else if (video_device
->device_id
!= device_id
) {
1413 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1415 if (ACPI_FAILURE(status
) || !buffer
||
1416 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1418 status
= acpi_video_device_EDID(video_device
, &buffer
,
1420 if (ACPI_FAILURE(status
) || !buffer
||
1421 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1426 *edid
= buffer
->buffer
.pointer
;
1432 EXPORT_SYMBOL(acpi_video_get_edid
);
1435 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1436 struct acpi_device
*device
)
1439 struct acpi_device
*dev
;
1442 * There are systems where video module known to work fine regardless
1443 * of broken _DOD and ignoring returned value here doesn't cause
1446 acpi_video_device_enumerate(video
);
1448 list_for_each_entry(dev
, &device
->children
, node
) {
1450 status
= acpi_video_bus_get_one_device(dev
, video
);
1452 dev_err(&dev
->dev
, "Can't attach device\n");
1459 static int acpi_video_bus_put_one_device(struct acpi_video_device
*device
)
1463 if (!device
|| !device
->video
)
1466 if (device
->flags
.notify
) {
1467 status
= acpi_remove_notify_handler(device
->dev
->handle
,
1468 ACPI_DEVICE_NOTIFY
, acpi_video_device_notify
);
1469 if (ACPI_FAILURE(status
))
1470 dev_err(&device
->dev
->dev
,
1471 "Can't remove video notify handler\n");
1474 if (device
->backlight
) {
1475 backlight_device_unregister(device
->backlight
);
1476 device
->backlight
= NULL
;
1478 if (device
->cooling_dev
) {
1479 sysfs_remove_link(&device
->dev
->dev
.kobj
,
1481 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
,
1483 thermal_cooling_device_unregister(device
->cooling_dev
);
1484 device
->cooling_dev
= NULL
;
1490 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1493 struct acpi_video_device
*dev
, *next
;
1495 mutex_lock(&video
->device_list_lock
);
1497 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1499 status
= acpi_video_bus_put_one_device(dev
);
1500 if (ACPI_FAILURE(status
))
1501 printk(KERN_WARNING PREFIX
1502 "hhuuhhuu bug in acpi video driver.\n");
1504 if (dev
->brightness
) {
1505 kfree(dev
->brightness
->levels
);
1506 kfree(dev
->brightness
);
1508 list_del(&dev
->entry
);
1512 mutex_unlock(&video
->device_list_lock
);
1517 /* acpi_video interface */
1519 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1521 return acpi_video_bus_DOS(video
, 0, 0);
1524 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1526 return acpi_video_bus_DOS(video
, 0, 1);
1529 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1531 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1532 struct input_dev
*input
;
1538 input
= video
->input
;
1541 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1542 * most likely via hotkey. */
1543 acpi_bus_generate_proc_event(device
, event
, 0);
1544 keycode
= KEY_SWITCHVIDEOMODE
;
1547 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1549 acpi_video_device_enumerate(video
);
1550 acpi_video_device_rebind(video
);
1551 acpi_bus_generate_proc_event(device
, event
, 0);
1552 keycode
= KEY_SWITCHVIDEOMODE
;
1555 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1556 acpi_bus_generate_proc_event(device
, event
, 0);
1557 keycode
= KEY_SWITCHVIDEOMODE
;
1559 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1560 acpi_bus_generate_proc_event(device
, event
, 0);
1561 keycode
= KEY_VIDEO_NEXT
;
1563 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1564 acpi_bus_generate_proc_event(device
, event
, 0);
1565 keycode
= KEY_VIDEO_PREV
;
1569 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1570 "Unsupported event [0x%x]\n", event
));
1574 if (acpi_notifier_call_chain(device
, event
, 0))
1575 /* Something vetoed the keypress. */
1579 input_report_key(input
, keycode
, 1);
1581 input_report_key(input
, keycode
, 0);
1588 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1590 struct acpi_video_device
*video_device
= data
;
1591 struct acpi_device
*device
= NULL
;
1592 struct acpi_video_bus
*bus
;
1593 struct input_dev
*input
;
1599 device
= video_device
->dev
;
1600 bus
= video_device
->video
;
1604 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1605 if (brightness_switch_enabled
)
1606 acpi_video_switch_brightness(video_device
, event
);
1607 acpi_bus_generate_proc_event(device
, event
, 0);
1608 keycode
= KEY_BRIGHTNESS_CYCLE
;
1610 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1611 if (brightness_switch_enabled
)
1612 acpi_video_switch_brightness(video_device
, event
);
1613 acpi_bus_generate_proc_event(device
, event
, 0);
1614 keycode
= KEY_BRIGHTNESSUP
;
1616 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1617 if (brightness_switch_enabled
)
1618 acpi_video_switch_brightness(video_device
, event
);
1619 acpi_bus_generate_proc_event(device
, event
, 0);
1620 keycode
= KEY_BRIGHTNESSDOWN
;
1622 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1623 if (brightness_switch_enabled
)
1624 acpi_video_switch_brightness(video_device
, event
);
1625 acpi_bus_generate_proc_event(device
, event
, 0);
1626 keycode
= KEY_BRIGHTNESS_ZERO
;
1628 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1629 if (brightness_switch_enabled
)
1630 acpi_video_switch_brightness(video_device
, event
);
1631 acpi_bus_generate_proc_event(device
, event
, 0);
1632 keycode
= KEY_DISPLAY_OFF
;
1635 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1636 "Unsupported event [0x%x]\n", event
));
1640 acpi_notifier_call_chain(device
, event
, 0);
1643 input_report_key(input
, keycode
, 1);
1645 input_report_key(input
, keycode
, 0);
1652 static int acpi_video_resume(struct notifier_block
*nb
,
1653 unsigned long val
, void *ign
)
1655 struct acpi_video_bus
*video
;
1656 struct acpi_video_device
*video_device
;
1660 case PM_HIBERNATION_PREPARE
:
1661 case PM_SUSPEND_PREPARE
:
1662 case PM_RESTORE_PREPARE
:
1666 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1668 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1670 for (i
= 0; i
< video
->attached_count
; i
++) {
1671 video_device
= video
->attached_array
[i
].bind_info
;
1672 if (video_device
&& video_device
->backlight
)
1673 acpi_video_set_brightness(video_device
->backlight
);
1680 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1681 void **return_value
)
1683 struct acpi_device
*device
= context
;
1684 struct acpi_device
*sibling
;
1687 if (handle
== device
->handle
)
1688 return AE_CTRL_TERMINATE
;
1690 result
= acpi_bus_get_device(handle
, &sibling
);
1694 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1695 return AE_ALREADY_EXISTS
;
1700 static int instance
;
1702 static int acpi_video_bus_add(struct acpi_device
*device
)
1704 struct acpi_video_bus
*video
;
1705 struct input_dev
*input
;
1709 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1710 device
->parent
->handle
, 1,
1711 acpi_video_bus_match
, NULL
,
1713 if (status
== AE_ALREADY_EXISTS
) {
1714 printk(KERN_WARNING FW_BUG
1715 "Duplicate ACPI video bus devices for the"
1716 " same VGA controller, please try module "
1717 "parameter \"video.allow_duplicates=1\""
1718 "if the current driver doesn't work.\n");
1719 if (!allow_duplicates
)
1723 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1727 /* a hack to fix the duplicate name "VID" problem on T61 */
1728 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1730 device
->pnp
.bus_id
[3] = '0' + instance
;
1733 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1734 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1736 device
->pnp
.bus_id
[3] = '0' + instance
;
1740 video
->device
= device
;
1741 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1742 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1743 device
->driver_data
= video
;
1745 acpi_video_bus_find_cap(video
);
1746 error
= acpi_video_bus_check(video
);
1748 goto err_free_video
;
1750 mutex_init(&video
->device_list_lock
);
1751 INIT_LIST_HEAD(&video
->video_device_list
);
1753 error
= acpi_video_bus_get_devices(video
, device
);
1757 video
->input
= input
= input_allocate_device();
1763 error
= acpi_video_bus_start_devices(video
);
1765 goto err_free_input_dev
;
1767 snprintf(video
->phys
, sizeof(video
->phys
),
1768 "%s/video/input0", acpi_device_hid(video
->device
));
1770 input
->name
= acpi_device_name(video
->device
);
1771 input
->phys
= video
->phys
;
1772 input
->id
.bustype
= BUS_HOST
;
1773 input
->id
.product
= 0x06;
1774 input
->dev
.parent
= &device
->dev
;
1775 input
->evbit
[0] = BIT(EV_KEY
);
1776 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1777 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1778 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1779 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1780 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1781 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1782 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1783 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1785 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1786 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1787 video
->flags
.multihead
? "yes" : "no",
1788 video
->flags
.rom
? "yes" : "no",
1789 video
->flags
.post
? "yes" : "no");
1791 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1792 video
->pm_nb
.priority
= 0;
1793 error
= register_pm_notifier(&video
->pm_nb
);
1795 goto err_stop_video
;
1797 error
= input_register_device(input
);
1799 goto err_unregister_pm_notifier
;
1803 err_unregister_pm_notifier
:
1804 unregister_pm_notifier(&video
->pm_nb
);
1806 acpi_video_bus_stop_devices(video
);
1808 input_free_device(input
);
1810 acpi_video_bus_put_devices(video
);
1811 kfree(video
->attached_array
);
1814 device
->driver_data
= NULL
;
1819 static int acpi_video_bus_remove(struct acpi_device
*device
)
1821 struct acpi_video_bus
*video
= NULL
;
1824 if (!device
|| !acpi_driver_data(device
))
1827 video
= acpi_driver_data(device
);
1829 unregister_pm_notifier(&video
->pm_nb
);
1831 acpi_video_bus_stop_devices(video
);
1832 acpi_video_bus_put_devices(video
);
1834 input_unregister_device(video
->input
);
1835 kfree(video
->attached_array
);
1841 static int __init
is_i740(struct pci_dev
*dev
)
1843 if (dev
->device
== 0x00D1)
1845 if (dev
->device
== 0x7000)
1850 static int __init
intel_opregion_present(void)
1853 struct pci_dev
*dev
= NULL
;
1856 for_each_pci_dev(dev
) {
1857 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1859 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
1861 /* We don't want to poke around undefined i740 registers */
1864 pci_read_config_dword(dev
, 0xfc, &address
);
1872 int acpi_video_register(void)
1875 if (register_count
) {
1877 * if the function of acpi_video_register is already called,
1878 * don't register the acpi_vide_bus again and return no error.
1883 result
= acpi_bus_register_driver(&acpi_video_bus
);
1888 * When the acpi_video_bus is loaded successfully, increase
1889 * the counter reference.
1895 EXPORT_SYMBOL(acpi_video_register
);
1897 void acpi_video_unregister(void)
1899 if (!register_count
) {
1901 * If the acpi video bus is already unloaded, don't
1902 * unload it again and return directly.
1906 acpi_bus_unregister_driver(&acpi_video_bus
);
1912 EXPORT_SYMBOL(acpi_video_unregister
);
1915 * This is kind of nasty. Hardware using Intel chipsets may require
1916 * the video opregion code to be run first in order to initialise
1917 * state before any ACPI video calls are made. To handle this we defer
1918 * registration of the video class until the opregion code has run.
1921 static int __init
acpi_video_init(void)
1923 dmi_check_system(video_dmi_table
);
1925 if (intel_opregion_present())
1928 return acpi_video_register();
1931 static void __exit
acpi_video_exit(void)
1933 acpi_video_unregister();
1938 module_init(acpi_video_init
);
1939 module_exit(acpi_video_exit
);