2 * video.c - ACPI Video Driver
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
46 #define PREFIX "ACPI: "
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
71 static bool brightness_switch_enabled
= 1;
72 module_param(brightness_switch_enabled
, bool, 0644);
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
78 static bool allow_duplicates
;
79 module_param(allow_duplicates
, bool, 0644);
81 static int disable_backlight_sysfs_if
= -1;
82 module_param(disable_backlight_sysfs_if
, int, 0444);
84 static int register_count
;
85 static DEFINE_MUTEX(register_count_mutex
);
86 static struct mutex video_list_lock
;
87 static struct list_head video_bus_head
;
88 static int acpi_video_bus_add(struct acpi_device
*device
);
89 static int acpi_video_bus_remove(struct acpi_device
*device
);
90 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
91 void acpi_video_detect_exit(void);
93 static const struct acpi_device_id video_device_ids
[] = {
97 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
99 static struct acpi_driver acpi_video_bus
= {
101 .class = ACPI_VIDEO_CLASS
,
102 .ids
= video_device_ids
,
104 .add
= acpi_video_bus_add
,
105 .remove
= acpi_video_bus_remove
,
106 .notify
= acpi_video_bus_notify
,
110 struct acpi_video_bus_flags
{
111 u8 multihead
:1; /* can switch video heads */
112 u8 rom
:1; /* can retrieve a video rom */
113 u8 post
:1; /* can configure the head to */
117 struct acpi_video_bus_cap
{
118 u8 _DOS
:1; /* Enable/Disable output switching */
119 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
120 u8 _ROM
:1; /* Get ROM Data */
121 u8 _GPD
:1; /* Get POST Device */
122 u8 _SPD
:1; /* Set POST Device */
123 u8 _VPO
:1; /* Video POST Options */
127 struct acpi_video_device_attrib
{
128 u32 display_index
:4; /* A zero-based instance of the Display */
129 u32 display_port_attachment
:4; /* This field differentiates the display type */
130 u32 display_type
:4; /* Describe the specific type in use */
131 u32 vendor_specific
:4; /* Chipset Vendor Specific */
132 u32 bios_can_detect
:1; /* BIOS can detect the device */
133 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
135 u32 pipe_id
:3; /* For VGA multiple-head devices. */
136 u32 reserved
:10; /* Must be 0 */
137 u32 device_id_scheme
:1; /* Device ID Scheme */
140 struct acpi_video_enumerated_device
{
143 struct acpi_video_device_attrib attrib
;
145 struct acpi_video_device
*bind_info
;
148 struct acpi_video_bus
{
149 struct acpi_device
*device
;
150 bool backlight_registered
;
152 struct acpi_video_enumerated_device
*attached_array
;
155 struct acpi_video_bus_cap cap
;
156 struct acpi_video_bus_flags flags
;
157 struct list_head video_device_list
;
158 struct mutex device_list_lock
; /* protects video_device_list */
159 struct list_head entry
;
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 _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 delayed_work switch_brightness_work
;
204 int switch_brightness_event
;
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 void acpi_video_switch_brightness(struct work_struct
*work
);
233 /* backlight device sysfs support */
234 static int acpi_video_get_brightness(struct backlight_device
*bd
)
236 unsigned long long cur_level
;
238 struct acpi_video_device
*vd
= 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
)
245 * The first two entries are special - see page 575
246 * 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
= bl_get_data(bd
);
258 cancel_delayed_work(&vd
->switch_brightness_work
);
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
,
320 * --------------------------------------------------------------------------
322 * --------------------------------------------------------------------------
326 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
327 union acpi_object
**levels
)
330 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
331 union acpi_object
*obj
;
336 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
337 if (!ACPI_SUCCESS(status
))
339 obj
= (union acpi_object
*)buffer
.pointer
;
340 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
341 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
351 kfree(buffer
.pointer
);
357 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
362 status
= acpi_execute_simple_method(device
->dev
->handle
,
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 video_set_bqc_offset(const struct dmi_system_id
*d
)
389 bqc_offset_aml_bug_workaround
= 9;
393 static int video_disable_backlight_sysfs_if(
394 const struct dmi_system_id
*d
)
396 if (disable_backlight_sysfs_if
== -1)
397 disable_backlight_sysfs_if
= 1;
401 static struct dmi_system_id video_dmi_table
[] = {
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"),
447 * Some machines have a broken acpi-video interface for brightness
448 * control, but still need an acpi_video_device_lcd_set_level() call
449 * on resume to turn the backlight power on. We Enable backlight
450 * control on these systems, but do not register a backlight sysfs
451 * as brightness control does not work.
454 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
455 .callback
= video_disable_backlight_sysfs_if
,
456 .ident
= "Toshiba Portege R830",
458 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
459 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R830"),
465 static unsigned long long
466 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
467 unsigned long long bqc_value
)
469 unsigned long long level
;
471 if (device
->brightness
->flags
._BQC_use_index
) {
473 * _BQC returns an index that doesn't account for
474 * the first 2 items with special meaning, so we need
475 * to compensate for that by offsetting ourselves
477 if (device
->brightness
->flags
._BCL_reversed
)
478 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
480 level
= device
->brightness
->levels
[bqc_value
+ 2];
485 level
+= bqc_offset_aml_bug_workaround
;
491 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
492 unsigned long long *level
, bool raw
)
494 acpi_status status
= AE_OK
;
497 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
498 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
500 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
502 if (ACPI_SUCCESS(status
)) {
505 * Caller has indicated he wants the raw
506 * value returned by _BQC, so don't furtherly
507 * mess with the value.
512 *level
= acpi_video_bqc_value_to_level(device
, *level
);
514 for (i
= 2; i
< device
->brightness
->count
; i
++)
515 if (device
->brightness
->levels
[i
] == *level
) {
516 device
->brightness
->curr
= *level
;
520 * BQC returned an invalid level.
523 ACPI_WARNING((AE_INFO
,
524 "%s returned an invalid level",
526 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
530 * should we return an error or ignore this failure?
531 * dev->brightness->curr is a cached value which stores
532 * the correct current backlight level in most cases.
533 * ACPI video backlight still works w/ buggy _BQC.
534 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
536 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
537 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
541 *level
= device
->brightness
->curr
;
546 acpi_video_device_EDID(struct acpi_video_device
*device
,
547 union acpi_object
**edid
, ssize_t length
)
550 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
551 union acpi_object
*obj
;
552 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
553 struct acpi_object_list args
= { 1, &arg0
};
561 arg0
.integer
.value
= 1;
562 else if (length
== 256)
563 arg0
.integer
.value
= 2;
567 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
568 if (ACPI_FAILURE(status
))
571 obj
= buffer
.pointer
;
573 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
576 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
588 * video : video bus device pointer
590 * 0. The system BIOS should NOT automatically switch(toggle)
591 * the active display output.
592 * 1. The system BIOS should automatically switch (toggle) the
593 * active display output. No switch event.
594 * 2. The _DGS value should be locked.
595 * 3. The system BIOS should not automatically switch (toggle) the
596 * active display output, but instead generate the display switch
599 * 0. The system BIOS should automatically control the brightness level
600 * of the LCD when the power changes from AC to DC
601 * 1. The system BIOS should NOT automatically control the brightness
602 * level of the LCD when the power changes from AC to DC.
608 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
612 if (!video
->cap
._DOS
)
615 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
617 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
618 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
619 (lcd_flag
<< 2) | bios_flag
);
620 if (ACPI_FAILURE(status
))
627 * Simple comparison function used to sort backlight levels.
631 acpi_video_cmp_level(const void *a
, const void *b
)
633 return *(int *)a
- *(int *)b
;
637 * Decides if _BQC/_BCQ for this system is usable
639 * We do this by changing the level first and then read out the current
640 * brightness level, if the value does not match, find out if it is using
641 * index. If not, clear the _BQC/_BCQ capability.
643 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
644 int max_level
, int current_level
)
646 struct acpi_video_device_brightness
*br
= device
->brightness
;
648 unsigned long long level
;
651 /* don't mess with existing known broken systems */
652 if (bqc_offset_aml_bug_workaround
)
656 * Some systems always report current brightness level as maximum
657 * through _BQC, we need to test another value for them.
659 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
661 result
= acpi_video_device_lcd_set_level(device
, test_level
);
665 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
669 if (level
!= test_level
) {
670 /* buggy _BQC found, need to find out if it uses index */
671 if (level
< br
->count
) {
672 if (br
->flags
._BCL_reversed
)
673 level
= br
->count
- 3 - level
;
674 if (br
->levels
[level
+ 2] == test_level
)
675 br
->flags
._BQC_use_index
= 1;
678 if (!br
->flags
._BQC_use_index
)
679 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
688 * device : video output device (LCD, CRT, ..)
691 * Maximum brightness level
693 * Allocate and initialize device->brightness.
697 acpi_video_init_brightness(struct acpi_video_device
*device
)
699 union acpi_object
*obj
= NULL
;
700 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
701 unsigned long long level
, level_old
;
702 union acpi_object
*o
;
703 struct acpi_video_device_brightness
*br
= NULL
;
704 int result
= -EINVAL
;
707 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
708 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
709 "LCD brightness level\n"));
713 if (obj
->package
.count
< 2)
716 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
718 printk(KERN_ERR
"can't allocate memory\n");
723 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
730 for (i
= 0; i
< obj
->package
.count
; i
++) {
731 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
732 if (o
->type
!= ACPI_TYPE_INTEGER
) {
733 printk(KERN_ERR PREFIX
"Invalid data\n");
736 value
= (u32
) o
->integer
.value
;
737 /* Skip duplicate entries */
738 if (count
> 2 && br
->levels
[count
- 1] == value
)
741 br
->levels
[count
] = value
;
743 if (br
->levels
[count
] > max_level
)
744 max_level
= br
->levels
[count
];
749 * some buggy BIOS don't export the levels
750 * when machine is on AC/Battery in _BCL package.
751 * In this case, the first two elements in _BCL packages
752 * are also supported brightness levels that OS should take care of.
754 for (i
= 2; i
< count
; i
++) {
755 if (br
->levels
[i
] == br
->levels
[0])
757 if (br
->levels
[i
] == br
->levels
[1])
761 if (level_ac_battery
< 2) {
762 level_ac_battery
= 2 - level_ac_battery
;
763 br
->flags
._BCL_no_ac_battery_levels
= 1;
764 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
765 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
766 count
+= level_ac_battery
;
767 } else if (level_ac_battery
> 2)
768 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
770 /* Check if the _BCL package is in a reversed order */
771 if (max_level
== br
->levels
[2]) {
772 br
->flags
._BCL_reversed
= 1;
773 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
774 acpi_video_cmp_level
, NULL
);
775 } else if (max_level
!= br
->levels
[count
- 1])
777 "Found unordered _BCL package"));
780 device
->brightness
= br
;
782 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
783 br
->curr
= level
= max_level
;
785 if (!device
->cap
._BQC
)
788 result
= acpi_video_device_lcd_get_level_current(device
,
791 goto out_free_levels
;
793 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
795 goto out_free_levels
;
797 * cap._BQC may get cleared due to _BQC is found to be broken
798 * in acpi_video_bqc_quirk, so check again here.
800 if (!device
->cap
._BQC
)
803 level
= acpi_video_bqc_value_to_level(device
, level_old
);
805 * On some buggy laptops, _BQC returns an uninitialized
806 * value when invoked for the first time, i.e.
807 * level_old is invalid (no matter whether it's a level
808 * or an index). Set the backlight to max_level in this case.
810 for (i
= 2; i
< br
->count
; i
++)
811 if (level
== br
->levels
[i
])
813 if (i
== br
->count
|| !level
)
817 result
= acpi_video_device_lcd_set_level(device
, level
);
819 goto out_free_levels
;
821 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
822 "found %d brightness levels\n", count
- 2));
831 device
->brightness
= NULL
;
838 * device : video output device (LCD, CRT, ..)
843 * Find out all required AML methods defined under the output
847 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
849 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
850 device
->cap
._ADR
= 1;
851 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
852 device
->cap
._BCL
= 1;
853 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
854 device
->cap
._BCM
= 1;
855 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
856 device
->cap
._BQC
= 1;
857 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
858 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
859 device
->cap
._BCQ
= 1;
862 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
863 device
->cap
._DDC
= 1;
868 * device : video output device (VGA)
873 * Find out all required AML methods defined under the video bus device.
876 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
878 if (acpi_has_method(video
->device
->handle
, "_DOS"))
880 if (acpi_has_method(video
->device
->handle
, "_DOD"))
882 if (acpi_has_method(video
->device
->handle
, "_ROM"))
884 if (acpi_has_method(video
->device
->handle
, "_GPD"))
886 if (acpi_has_method(video
->device
->handle
, "_SPD"))
888 if (acpi_has_method(video
->device
->handle
, "_VPO"))
893 * Check whether the video bus device has required AML method to
894 * support the desired features
897 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
899 acpi_status status
= -ENOENT
;
905 dev
= acpi_get_pci_dev(video
->device
->handle
);
911 * Since there is no HID, CID and so on for VGA driver, we have
912 * to check well known required nodes.
915 /* Does this device support video switching? */
916 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
917 if (!video
->cap
._DOS
) {
918 printk(KERN_WARNING FW_BUG
919 "ACPI(%s) defines _DOD but not _DOS\n",
920 acpi_device_bid(video
->device
));
922 video
->flags
.multihead
= 1;
926 /* Does this device support retrieving a video ROM? */
927 if (video
->cap
._ROM
) {
928 video
->flags
.rom
= 1;
932 /* Does this device support configuring which video device to POST? */
933 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
934 video
->flags
.post
= 1;
942 * --------------------------------------------------------------------------
944 * --------------------------------------------------------------------------
947 /* device interface */
948 static struct acpi_video_device_attrib
*
949 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
951 struct acpi_video_enumerated_device
*ids
;
954 for (i
= 0; i
< video
->attached_count
; i
++) {
955 ids
= &video
->attached_array
[i
];
956 if ((ids
->value
.int_val
& 0xffff) == device_id
)
957 return &ids
->value
.attrib
;
964 acpi_video_get_device_type(struct acpi_video_bus
*video
,
965 unsigned long device_id
)
967 struct acpi_video_enumerated_device
*ids
;
970 for (i
= 0; i
< video
->attached_count
; i
++) {
971 ids
= &video
->attached_array
[i
];
972 if ((ids
->value
.int_val
& 0xffff) == device_id
)
973 return ids
->value
.int_val
;
980 acpi_video_bus_get_one_device(struct acpi_device
*device
,
981 struct acpi_video_bus
*video
)
983 unsigned long long device_id
;
984 int status
, device_type
;
985 struct acpi_video_device
*data
;
986 struct acpi_video_device_attrib
*attribute
;
989 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
990 /* Some device omits _ADR, we skip them instead of fail */
991 if (ACPI_FAILURE(status
))
994 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
998 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
999 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1000 device
->driver_data
= data
;
1002 data
->device_id
= device_id
;
1003 data
->video
= video
;
1005 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1006 acpi_video_switch_brightness
);
1008 attribute
= acpi_video_get_device_attr(video
, device_id
);
1010 if (attribute
&& attribute
->device_id_scheme
) {
1011 switch (attribute
->display_type
) {
1012 case ACPI_VIDEO_DISPLAY_CRT
:
1013 data
->flags
.crt
= 1;
1015 case ACPI_VIDEO_DISPLAY_TV
:
1016 data
->flags
.tvout
= 1;
1018 case ACPI_VIDEO_DISPLAY_DVI
:
1019 data
->flags
.dvi
= 1;
1021 case ACPI_VIDEO_DISPLAY_LCD
:
1022 data
->flags
.lcd
= 1;
1025 data
->flags
.unknown
= 1;
1028 if (attribute
->bios_can_detect
)
1029 data
->flags
.bios
= 1;
1031 /* Check for legacy IDs */
1032 device_type
= acpi_video_get_device_type(video
, device_id
);
1033 /* Ignore bits 16 and 18-20 */
1034 switch (device_type
& 0xffe2ffff) {
1035 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1036 data
->flags
.crt
= 1;
1038 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1039 data
->flags
.lcd
= 1;
1041 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1042 data
->flags
.tvout
= 1;
1045 data
->flags
.unknown
= 1;
1049 acpi_video_device_bind(video
, data
);
1050 acpi_video_device_find_cap(data
);
1052 mutex_lock(&video
->device_list_lock
);
1053 list_add_tail(&data
->entry
, &video
->video_device_list
);
1054 mutex_unlock(&video
->device_list_lock
);
1061 * video : video bus device
1066 * Enumerate the video device list of the video bus,
1067 * bind the ids with the corresponding video devices
1068 * under the video bus.
1071 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1073 struct acpi_video_device
*dev
;
1075 mutex_lock(&video
->device_list_lock
);
1077 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1078 acpi_video_device_bind(video
, dev
);
1080 mutex_unlock(&video
->device_list_lock
);
1085 * video : video bus device
1086 * device : video output device under the video
1092 * Bind the ids with the corresponding video devices
1093 * under the video bus.
1097 acpi_video_device_bind(struct acpi_video_bus
*video
,
1098 struct acpi_video_device
*device
)
1100 struct acpi_video_enumerated_device
*ids
;
1103 for (i
= 0; i
< video
->attached_count
; i
++) {
1104 ids
= &video
->attached_array
[i
];
1105 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1106 ids
->bind_info
= device
;
1107 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1112 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1114 struct acpi_video_bus
*video
= device
->video
;
1118 * If we have a broken _DOD or we have more than 8 output devices
1119 * under the graphics controller node that we can't proper deal with
1120 * in the operation region code currently, no need to test.
1122 if (!video
->attached_count
|| video
->child_count
> 8)
1125 for (i
= 0; i
< video
->attached_count
; i
++) {
1126 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1127 (device
->device_id
& 0xfff))
1136 * video : video bus device
1141 * Call _DOD to enumerate all devices attached to display adapter
1145 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1150 struct acpi_video_enumerated_device
*active_list
;
1151 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1152 union acpi_object
*dod
= NULL
;
1153 union acpi_object
*obj
;
1155 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1156 if (!ACPI_SUCCESS(status
)) {
1157 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1161 dod
= buffer
.pointer
;
1162 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1163 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1168 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1169 dod
->package
.count
));
1171 active_list
= kcalloc(1 + dod
->package
.count
,
1172 sizeof(struct acpi_video_enumerated_device
),
1180 for (i
= 0; i
< dod
->package
.count
; i
++) {
1181 obj
= &dod
->package
.elements
[i
];
1183 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1184 printk(KERN_ERR PREFIX
1185 "Invalid _DOD data in element %d\n", i
);
1189 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1190 active_list
[count
].bind_info
= NULL
;
1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1192 (int)obj
->integer
.value
));
1196 kfree(video
->attached_array
);
1198 video
->attached_array
= active_list
;
1199 video
->attached_count
= count
;
1202 kfree(buffer
.pointer
);
1207 acpi_video_get_next_level(struct acpi_video_device
*device
,
1208 u32 level_current
, u32 event
)
1210 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1211 max
= max_below
= 0;
1212 min
= min_above
= 255;
1213 /* Find closest level to level_current */
1214 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1215 l
= device
->brightness
->levels
[i
];
1216 if (abs(l
- level_current
) < abs(delta
)) {
1217 delta
= l
- level_current
;
1222 /* Ajust level_current to closest available level */
1223 level_current
+= delta
;
1224 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1225 l
= device
->brightness
->levels
[i
];
1230 if (l
< min_above
&& l
> level_current
)
1232 if (l
> max_below
&& l
< level_current
)
1237 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1238 return (level_current
< max
) ? min_above
: min
;
1239 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1240 return (level_current
< max
) ? min_above
: max
;
1241 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1242 return (level_current
> min
) ? max_below
: min
;
1243 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1244 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1247 return level_current
;
1252 acpi_video_switch_brightness(struct work_struct
*work
)
1254 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1255 struct acpi_video_device
, switch_brightness_work
);
1256 unsigned long long level_current
, level_next
;
1257 int event
= device
->switch_brightness_event
;
1258 int result
= -EINVAL
;
1260 /* no warning message if acpi_backlight=vendor or a quirk is used */
1261 if (!device
->backlight
)
1264 if (!device
->brightness
)
1267 result
= acpi_video_device_lcd_get_level_current(device
,
1273 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1275 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1278 backlight_force_update(device
->backlight
,
1279 BACKLIGHT_UPDATE_HOTKEY
);
1283 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1286 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1289 struct acpi_video_bus
*video
;
1290 struct acpi_video_device
*video_device
;
1291 union acpi_object
*buffer
= NULL
;
1295 if (!device
|| !acpi_driver_data(device
))
1298 video
= acpi_driver_data(device
);
1300 for (i
= 0; i
< video
->attached_count
; i
++) {
1301 video_device
= video
->attached_array
[i
].bind_info
;
1307 if (!video_device
->cap
._DDC
)
1312 case ACPI_VIDEO_DISPLAY_CRT
:
1313 if (!video_device
->flags
.crt
)
1316 case ACPI_VIDEO_DISPLAY_TV
:
1317 if (!video_device
->flags
.tvout
)
1320 case ACPI_VIDEO_DISPLAY_DVI
:
1321 if (!video_device
->flags
.dvi
)
1324 case ACPI_VIDEO_DISPLAY_LCD
:
1325 if (!video_device
->flags
.lcd
)
1329 } else if (video_device
->device_id
!= device_id
) {
1333 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1335 if (ACPI_FAILURE(status
) || !buffer
||
1336 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1338 status
= acpi_video_device_EDID(video_device
, &buffer
,
1340 if (ACPI_FAILURE(status
) || !buffer
||
1341 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1346 *edid
= buffer
->buffer
.pointer
;
1352 EXPORT_SYMBOL(acpi_video_get_edid
);
1355 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1356 struct acpi_device
*device
)
1359 struct acpi_device
*dev
;
1362 * There are systems where video module known to work fine regardless
1363 * of broken _DOD and ignoring returned value here doesn't cause
1366 acpi_video_device_enumerate(video
);
1368 list_for_each_entry(dev
, &device
->children
, node
) {
1370 status
= acpi_video_bus_get_one_device(dev
, video
);
1372 dev_err(&dev
->dev
, "Can't attach device\n");
1375 video
->child_count
++;
1380 /* acpi_video interface */
1383 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1384 * preform any automatic brightness change on receiving a notification.
1386 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1388 return acpi_video_bus_DOS(video
, 0,
1389 acpi_osi_is_win8() ? 1 : 0);
1392 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1394 return acpi_video_bus_DOS(video
, 0,
1395 acpi_osi_is_win8() ? 0 : 1);
1398 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1400 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1401 struct input_dev
*input
;
1404 if (!video
|| !video
->input
)
1407 input
= video
->input
;
1410 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1411 * most likely via hotkey. */
1412 keycode
= KEY_SWITCHVIDEOMODE
;
1415 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1417 acpi_video_device_enumerate(video
);
1418 acpi_video_device_rebind(video
);
1419 keycode
= KEY_SWITCHVIDEOMODE
;
1422 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1423 keycode
= KEY_SWITCHVIDEOMODE
;
1425 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1426 keycode
= KEY_VIDEO_NEXT
;
1428 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1429 keycode
= KEY_VIDEO_PREV
;
1433 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1434 "Unsupported event [0x%x]\n", event
));
1438 if (acpi_notifier_call_chain(device
, event
, 0))
1439 /* Something vetoed the keypress. */
1443 input_report_key(input
, keycode
, 1);
1445 input_report_key(input
, keycode
, 0);
1452 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1455 if (!brightness_switch_enabled
)
1458 video_device
->switch_brightness_event
= event
;
1459 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1462 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1464 struct acpi_video_device
*video_device
= data
;
1465 struct acpi_device
*device
= NULL
;
1466 struct acpi_video_bus
*bus
;
1467 struct input_dev
*input
;
1473 device
= video_device
->dev
;
1474 bus
= video_device
->video
;
1478 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1479 brightness_switch_event(video_device
, event
);
1480 keycode
= KEY_BRIGHTNESS_CYCLE
;
1482 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1483 brightness_switch_event(video_device
, event
);
1484 keycode
= KEY_BRIGHTNESSUP
;
1486 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1487 brightness_switch_event(video_device
, event
);
1488 keycode
= KEY_BRIGHTNESSDOWN
;
1490 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1491 brightness_switch_event(video_device
, event
);
1492 keycode
= KEY_BRIGHTNESS_ZERO
;
1494 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1495 brightness_switch_event(video_device
, event
);
1496 keycode
= KEY_DISPLAY_OFF
;
1499 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1500 "Unsupported event [0x%x]\n", event
));
1504 acpi_notifier_call_chain(device
, event
, 0);
1507 input_report_key(input
, keycode
, 1);
1509 input_report_key(input
, keycode
, 0);
1516 static int acpi_video_resume(struct notifier_block
*nb
,
1517 unsigned long val
, void *ign
)
1519 struct acpi_video_bus
*video
;
1520 struct acpi_video_device
*video_device
;
1524 case PM_HIBERNATION_PREPARE
:
1525 case PM_SUSPEND_PREPARE
:
1526 case PM_RESTORE_PREPARE
:
1530 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1532 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1534 for (i
= 0; i
< video
->attached_count
; i
++) {
1535 video_device
= video
->attached_array
[i
].bind_info
;
1536 if (video_device
&& video_device
->brightness
)
1537 acpi_video_device_lcd_set_level(video_device
,
1538 video_device
->brightness
->curr
);
1545 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1546 void **return_value
)
1548 struct acpi_device
*device
= context
;
1549 struct acpi_device
*sibling
;
1552 if (handle
== device
->handle
)
1553 return AE_CTRL_TERMINATE
;
1555 result
= acpi_bus_get_device(handle
, &sibling
);
1559 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1560 return AE_ALREADY_EXISTS
;
1565 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1567 struct backlight_properties props
;
1568 struct pci_dev
*pdev
;
1569 acpi_handle acpi_parent
;
1570 struct device
*parent
= NULL
;
1576 * Do not create backlight device for video output
1577 * device that is not in the enumerated list.
1579 if (!acpi_video_device_in_dod(device
)) {
1580 dev_dbg(&device
->dev
->dev
, "not in _DOD list, ignore\n");
1584 result
= acpi_video_init_brightness(device
);
1588 if (disable_backlight_sysfs_if
> 0)
1591 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1596 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1598 pdev
= acpi_get_pci_dev(acpi_parent
);
1600 parent
= &pdev
->dev
;
1604 memset(&props
, 0, sizeof(struct backlight_properties
));
1605 props
.type
= BACKLIGHT_FIRMWARE
;
1606 props
.max_brightness
= device
->brightness
->count
- 3;
1607 device
->backlight
= backlight_device_register(name
,
1610 &acpi_backlight_ops
,
1613 if (IS_ERR(device
->backlight
)) {
1614 device
->backlight
= NULL
;
1619 * Save current brightness level in case we have to restore it
1620 * before acpi_video_device_lcd_set_level() is called next time.
1622 device
->backlight
->props
.brightness
=
1623 acpi_video_get_brightness(device
->backlight
);
1625 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1626 device
->dev
, &video_cooling_ops
);
1627 if (IS_ERR(device
->cooling_dev
)) {
1629 * Set cooling_dev to NULL so we don't crash trying to free it.
1630 * Also, why the hell we are returning early and not attempt to
1631 * register video output if cooling device registration failed?
1634 device
->cooling_dev
= NULL
;
1638 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1639 device
->cooling_dev
->id
);
1640 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1641 &device
->cooling_dev
->device
.kobj
,
1644 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1645 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1646 &device
->dev
->dev
.kobj
, "device");
1648 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1651 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1653 struct acpi_video_device
*dev
;
1654 union acpi_object
*levels
;
1656 mutex_lock(&video
->device_list_lock
);
1657 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1658 if (!acpi_video_device_lcd_query_levels(dev
, &levels
))
1661 mutex_unlock(&video
->device_list_lock
);
1664 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1666 struct acpi_video_device
*dev
;
1668 if (video
->backlight_registered
)
1671 acpi_video_run_bcl_for_osi(video
);
1673 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1676 mutex_lock(&video
->device_list_lock
);
1677 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1678 acpi_video_dev_register_backlight(dev
);
1679 mutex_unlock(&video
->device_list_lock
);
1681 video
->backlight_registered
= true;
1683 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1684 video
->pm_nb
.priority
= 0;
1685 return register_pm_notifier(&video
->pm_nb
);
1688 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1690 if (device
->backlight
) {
1691 backlight_device_unregister(device
->backlight
);
1692 device
->backlight
= NULL
;
1694 if (device
->brightness
) {
1695 kfree(device
->brightness
->levels
);
1696 kfree(device
->brightness
);
1697 device
->brightness
= NULL
;
1699 if (device
->cooling_dev
) {
1700 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1701 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1702 thermal_cooling_device_unregister(device
->cooling_dev
);
1703 device
->cooling_dev
= NULL
;
1707 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1709 struct acpi_video_device
*dev
;
1712 if (!video
->backlight_registered
)
1715 error
= unregister_pm_notifier(&video
->pm_nb
);
1717 mutex_lock(&video
->device_list_lock
);
1718 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1719 acpi_video_dev_unregister_backlight(dev
);
1720 mutex_unlock(&video
->device_list_lock
);
1722 video
->backlight_registered
= false;
1727 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1730 struct acpi_device
*adev
= device
->dev
;
1732 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1733 acpi_video_device_notify
, device
);
1734 if (ACPI_FAILURE(status
))
1735 dev_err(&adev
->dev
, "Error installing notify handler\n");
1737 device
->flags
.notify
= 1;
1740 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1742 struct input_dev
*input
;
1743 struct acpi_video_device
*dev
;
1746 video
->input
= input
= input_allocate_device();
1752 error
= acpi_video_bus_start_devices(video
);
1754 goto err_free_input
;
1756 snprintf(video
->phys
, sizeof(video
->phys
),
1757 "%s/video/input0", acpi_device_hid(video
->device
));
1759 input
->name
= acpi_device_name(video
->device
);
1760 input
->phys
= video
->phys
;
1761 input
->id
.bustype
= BUS_HOST
;
1762 input
->id
.product
= 0x06;
1763 input
->dev
.parent
= &video
->device
->dev
;
1764 input
->evbit
[0] = BIT(EV_KEY
);
1765 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1766 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1767 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1768 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1769 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1770 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1771 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1772 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1774 error
= input_register_device(input
);
1778 mutex_lock(&video
->device_list_lock
);
1779 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1780 acpi_video_dev_add_notify_handler(dev
);
1781 mutex_unlock(&video
->device_list_lock
);
1786 acpi_video_bus_stop_devices(video
);
1788 input_free_device(input
);
1789 video
->input
= NULL
;
1794 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1796 if (dev
->flags
.notify
) {
1797 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1798 acpi_video_device_notify
);
1799 dev
->flags
.notify
= 0;
1803 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1805 struct acpi_video_device
*dev
;
1807 mutex_lock(&video
->device_list_lock
);
1808 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1809 acpi_video_dev_remove_notify_handler(dev
);
1810 mutex_unlock(&video
->device_list_lock
);
1812 acpi_video_bus_stop_devices(video
);
1813 input_unregister_device(video
->input
);
1814 video
->input
= NULL
;
1817 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1819 struct acpi_video_device
*dev
, *next
;
1821 mutex_lock(&video
->device_list_lock
);
1822 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1823 list_del(&dev
->entry
);
1826 mutex_unlock(&video
->device_list_lock
);
1831 static int instance
;
1833 static int acpi_video_bus_add(struct acpi_device
*device
)
1835 struct acpi_video_bus
*video
;
1839 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1840 device
->parent
->handle
, 1,
1841 acpi_video_bus_match
, NULL
,
1843 if (status
== AE_ALREADY_EXISTS
) {
1844 printk(KERN_WARNING FW_BUG
1845 "Duplicate ACPI video bus devices for the"
1846 " same VGA controller, please try module "
1847 "parameter \"video.allow_duplicates=1\""
1848 "if the current driver doesn't work.\n");
1849 if (!allow_duplicates
)
1853 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1857 /* a hack to fix the duplicate name "VID" problem on T61 */
1858 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1860 device
->pnp
.bus_id
[3] = '0' + instance
;
1863 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1864 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1866 device
->pnp
.bus_id
[3] = '0' + instance
;
1870 video
->device
= device
;
1871 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1872 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1873 device
->driver_data
= video
;
1875 acpi_video_bus_find_cap(video
);
1876 error
= acpi_video_bus_check(video
);
1878 goto err_free_video
;
1880 mutex_init(&video
->device_list_lock
);
1881 INIT_LIST_HEAD(&video
->video_device_list
);
1883 error
= acpi_video_bus_get_devices(video
, device
);
1887 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1888 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1889 video
->flags
.multihead
? "yes" : "no",
1890 video
->flags
.rom
? "yes" : "no",
1891 video
->flags
.post
? "yes" : "no");
1892 mutex_lock(&video_list_lock
);
1893 list_add_tail(&video
->entry
, &video_bus_head
);
1894 mutex_unlock(&video_list_lock
);
1896 acpi_video_bus_register_backlight(video
);
1897 acpi_video_bus_add_notify_handler(video
);
1902 acpi_video_bus_put_devices(video
);
1903 kfree(video
->attached_array
);
1906 device
->driver_data
= NULL
;
1911 static int acpi_video_bus_remove(struct acpi_device
*device
)
1913 struct acpi_video_bus
*video
= NULL
;
1916 if (!device
|| !acpi_driver_data(device
))
1919 video
= acpi_driver_data(device
);
1921 acpi_video_bus_remove_notify_handler(video
);
1922 acpi_video_bus_unregister_backlight(video
);
1923 acpi_video_bus_put_devices(video
);
1925 mutex_lock(&video_list_lock
);
1926 list_del(&video
->entry
);
1927 mutex_unlock(&video_list_lock
);
1929 kfree(video
->attached_array
);
1935 static int __init
is_i740(struct pci_dev
*dev
)
1937 if (dev
->device
== 0x00D1)
1939 if (dev
->device
== 0x7000)
1944 static int __init
intel_opregion_present(void)
1947 struct pci_dev
*dev
= NULL
;
1950 for_each_pci_dev(dev
) {
1951 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1953 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
1955 /* We don't want to poke around undefined i740 registers */
1958 pci_read_config_dword(dev
, 0xfc, &address
);
1966 int acpi_video_register(void)
1970 mutex_lock(®ister_count_mutex
);
1971 if (register_count
) {
1973 * if the function of acpi_video_register is already called,
1974 * don't register the acpi_vide_bus again and return no error.
1979 mutex_init(&video_list_lock
);
1980 INIT_LIST_HEAD(&video_bus_head
);
1982 dmi_check_system(video_dmi_table
);
1984 ret
= acpi_bus_register_driver(&acpi_video_bus
);
1989 * When the acpi_video_bus is loaded successfully, increase
1990 * the counter reference.
1995 mutex_unlock(®ister_count_mutex
);
1998 EXPORT_SYMBOL(acpi_video_register
);
2000 void acpi_video_unregister(void)
2002 mutex_lock(®ister_count_mutex
);
2003 if (register_count
) {
2004 acpi_bus_unregister_driver(&acpi_video_bus
);
2007 mutex_unlock(®ister_count_mutex
);
2009 EXPORT_SYMBOL(acpi_video_unregister
);
2011 void acpi_video_unregister_backlight(void)
2013 struct acpi_video_bus
*video
;
2015 mutex_lock(®ister_count_mutex
);
2016 if (register_count
) {
2017 mutex_lock(&video_list_lock
);
2018 list_for_each_entry(video
, &video_bus_head
, entry
)
2019 acpi_video_bus_unregister_backlight(video
);
2020 mutex_unlock(&video_list_lock
);
2022 mutex_unlock(®ister_count_mutex
);
2026 * This is kind of nasty. Hardware using Intel chipsets may require
2027 * the video opregion code to be run first in order to initialise
2028 * state before any ACPI video calls are made. To handle this we defer
2029 * registration of the video class until the opregion code has run.
2032 static int __init
acpi_video_init(void)
2035 * Let the module load even if ACPI is disabled (e.g. due to
2036 * a broken BIOS) so that i915.ko can still be loaded on such
2037 * old systems without an AcpiOpRegion.
2039 * acpi_video_register() will report -ENODEV later as well due
2040 * to acpi_disabled when i915.ko tries to register itself afterwards.
2045 if (intel_opregion_present())
2048 return acpi_video_register();
2051 static void __exit
acpi_video_exit(void)
2053 acpi_video_detect_exit();
2054 acpi_video_unregister();
2059 module_init(acpi_video_init
);
2060 module_exit(acpi_video_exit
);