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>
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);
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
85 static int use_native_backlight_param
= -1;
86 module_param_named(use_native_backlight
, use_native_backlight_param
, int, 0444);
87 static bool use_native_backlight_dmi
= true;
89 static int register_count
;
90 static struct mutex video_list_lock
;
91 static struct list_head video_bus_head
;
92 static int acpi_video_bus_add(struct acpi_device
*device
);
93 static int acpi_video_bus_remove(struct acpi_device
*device
);
94 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
96 static const struct acpi_device_id video_device_ids
[] = {
100 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
102 static struct acpi_driver acpi_video_bus
= {
104 .class = ACPI_VIDEO_CLASS
,
105 .ids
= video_device_ids
,
107 .add
= acpi_video_bus_add
,
108 .remove
= acpi_video_bus_remove
,
109 .notify
= acpi_video_bus_notify
,
113 struct acpi_video_bus_flags
{
114 u8 multihead
:1; /* can switch video heads */
115 u8 rom
:1; /* can retrieve a video rom */
116 u8 post
:1; /* can configure the head to */
120 struct acpi_video_bus_cap
{
121 u8 _DOS
:1; /* Enable/Disable output switching */
122 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM
:1; /* Get ROM Data */
124 u8 _GPD
:1; /* Get POST Device */
125 u8 _SPD
:1; /* Set POST Device */
126 u8 _VPO
:1; /* Video POST Options */
130 struct acpi_video_device_attrib
{
131 u32 display_index
:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment
:4; /* This field differentiates the display type */
133 u32 display_type
:4; /* Describe the specific type in use */
134 u32 vendor_specific
:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect
:1; /* BIOS can detect the device */
136 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
138 u32 pipe_id
:3; /* For VGA multiple-head devices. */
139 u32 reserved
:10; /* Must be 0 */
140 u32 device_id_scheme
:1; /* Device ID Scheme */
143 struct acpi_video_enumerated_device
{
146 struct acpi_video_device_attrib attrib
;
148 struct acpi_video_device
*bind_info
;
151 struct acpi_video_bus
{
152 struct acpi_device
*device
;
153 bool backlight_registered
;
154 bool backlight_notifier_registered
;
156 struct acpi_video_enumerated_device
*attached_array
;
158 struct acpi_video_bus_cap cap
;
159 struct acpi_video_bus_flags flags
;
160 struct list_head video_device_list
;
161 struct mutex device_list_lock
; /* protects video_device_list */
162 struct list_head entry
;
163 struct input_dev
*input
;
164 char phys
[32]; /* for input device */
165 struct notifier_block pm_nb
;
166 struct notifier_block backlight_nb
;
169 struct acpi_video_device_flags
{
180 struct acpi_video_device_cap
{
181 u8 _ADR
:1; /* Return the unique ID */
182 u8 _BCL
:1; /* Query list of brightness control levels supported */
183 u8 _BCM
:1; /* Set the brightness level */
184 u8 _BQC
:1; /* Get current brightness level */
185 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
186 u8 _DDC
:1; /* Return the EDID for this device */
189 struct acpi_video_brightness_flags
{
190 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
191 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order */
192 u8 _BQC_use_index
:1; /* _BQC returns an index value */
195 struct acpi_video_device_brightness
{
199 struct acpi_video_brightness_flags flags
;
202 struct acpi_video_device
{
203 unsigned long device_id
;
204 struct acpi_video_device_flags flags
;
205 struct acpi_video_device_cap cap
;
206 struct list_head entry
;
207 struct delayed_work switch_brightness_work
;
208 int switch_brightness_event
;
209 struct acpi_video_bus
*video
;
210 struct acpi_device
*dev
;
211 struct acpi_video_device_brightness
*brightness
;
212 struct backlight_device
*backlight
;
213 struct thermal_cooling_device
*cooling_dev
;
216 static const char device_decode
[][30] = {
217 "motherboard VGA device",
223 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
224 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
225 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
226 struct acpi_video_device
*device
);
227 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
228 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
230 static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device
*device
,
232 unsigned long long *level
, bool raw
);
233 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
234 u32 level_current
, u32 event
);
235 static void acpi_video_switch_brightness(struct work_struct
*work
);
237 static bool acpi_video_use_native_backlight(void)
239 if (use_native_backlight_param
!= -1)
240 return use_native_backlight_param
;
242 return use_native_backlight_dmi
;
245 bool acpi_video_verify_backlight_support(void)
247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
248 backlight_device_registered(BACKLIGHT_RAW
))
250 return acpi_video_backlight_support();
252 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support
);
254 /* backlight device sysfs support */
255 static int acpi_video_get_brightness(struct backlight_device
*bd
)
257 unsigned long long cur_level
;
259 struct acpi_video_device
*vd
= bl_get_data(bd
);
261 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
263 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
264 if (vd
->brightness
->levels
[i
] == cur_level
)
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
274 static int acpi_video_set_brightness(struct backlight_device
*bd
)
276 int request_level
= bd
->props
.brightness
+ 2;
277 struct acpi_video_device
*vd
= bl_get_data(bd
);
279 cancel_delayed_work(&vd
->switch_brightness_work
);
280 return acpi_video_device_lcd_set_level(vd
,
281 vd
->brightness
->levels
[request_level
]);
284 static const struct backlight_ops acpi_backlight_ops
= {
285 .get_brightness
= acpi_video_get_brightness
,
286 .update_status
= acpi_video_set_brightness
,
289 /* thermal cooling device callbacks */
290 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
293 struct acpi_device
*device
= cooling_dev
->devdata
;
294 struct acpi_video_device
*video
= acpi_driver_data(device
);
296 *state
= video
->brightness
->count
- 3;
300 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
303 struct acpi_device
*device
= cooling_dev
->devdata
;
304 struct acpi_video_device
*video
= acpi_driver_data(device
);
305 unsigned long long level
;
308 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
310 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
311 if (level
== video
->brightness
->levels
[offset
]) {
312 *state
= video
->brightness
->count
- offset
- 1;
320 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
322 struct acpi_device
*device
= cooling_dev
->devdata
;
323 struct acpi_video_device
*video
= acpi_driver_data(device
);
326 if (state
>= video
->brightness
->count
- 2)
329 state
= video
->brightness
->count
- state
;
330 level
= video
->brightness
->levels
[state
- 1];
331 return acpi_video_device_lcd_set_level(video
, level
);
334 static const struct thermal_cooling_device_ops video_cooling_ops
= {
335 .get_max_state
= video_get_max_state
,
336 .get_cur_state
= video_get_cur_state
,
337 .set_cur_state
= video_set_cur_state
,
341 * --------------------------------------------------------------------------
343 * --------------------------------------------------------------------------
347 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
348 union acpi_object
**levels
)
351 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
352 union acpi_object
*obj
;
357 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
358 if (!ACPI_SUCCESS(status
))
360 obj
= (union acpi_object
*)buffer
.pointer
;
361 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
362 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
372 kfree(buffer
.pointer
);
378 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
383 status
= acpi_execute_simple_method(device
->dev
->handle
,
385 if (ACPI_FAILURE(status
)) {
386 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
390 device
->brightness
->curr
= level
;
391 for (state
= 2; state
< device
->brightness
->count
; state
++)
392 if (level
== device
->brightness
->levels
[state
]) {
393 if (device
->backlight
)
394 device
->backlight
->props
.brightness
= state
- 2;
398 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
407 static int bqc_offset_aml_bug_workaround
;
408 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
410 bqc_offset_aml_bug_workaround
= 9;
414 static int __init
video_disable_native_backlight(const struct dmi_system_id
*d
)
416 use_native_backlight_dmi
= false;
420 static struct dmi_system_id video_dmi_table
[] __initdata
= {
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
425 .callback
= video_set_bqc_offset
,
426 .ident
= "Acer Aspire 5720",
428 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
433 .callback
= video_set_bqc_offset
,
434 .ident
= "Acer Aspire 5710Z",
436 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
441 .callback
= video_set_bqc_offset
,
442 .ident
= "eMachines E510",
444 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
449 .callback
= video_set_bqc_offset
,
450 .ident
= "Acer Aspire 5315",
452 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
457 .callback
= video_set_bqc_offset
,
458 .ident
= "Acer Aspire 7720",
460 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
466 * These models have a working acpi_video backlight control, and using
467 * native backlight causes a regression where backlight does not work
468 * when userspace is not handling brightness key events. Disable
469 * native_backlight on these to fix this:
470 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
473 .callback
= video_disable_native_backlight
,
474 .ident
= "ThinkPad T420",
476 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
477 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad T420"),
481 .callback
= video_disable_native_backlight
,
482 .ident
= "ThinkPad T520",
484 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
485 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad T520"),
489 .callback
= video_disable_native_backlight
,
490 .ident
= "ThinkPad X201s",
492 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
493 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad X201s"),
497 /* The native backlight controls do not work on some older machines */
499 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
500 .callback
= video_disable_native_backlight
,
501 .ident
= "HP ENVY 15 Notebook",
503 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
504 DMI_MATCH(DMI_PRODUCT_NAME
, "HP ENVY 15 Notebook PC"),
510 static unsigned long long
511 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
512 unsigned long long bqc_value
)
514 unsigned long long level
;
516 if (device
->brightness
->flags
._BQC_use_index
) {
518 * _BQC returns an index that doesn't account for
519 * the first 2 items with special meaning, so we need
520 * to compensate for that by offsetting ourselves
522 if (device
->brightness
->flags
._BCL_reversed
)
523 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
525 level
= device
->brightness
->levels
[bqc_value
+ 2];
530 level
+= bqc_offset_aml_bug_workaround
;
536 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
537 unsigned long long *level
, bool raw
)
539 acpi_status status
= AE_OK
;
542 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
543 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
545 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
547 if (ACPI_SUCCESS(status
)) {
550 * Caller has indicated he wants the raw
551 * value returned by _BQC, so don't furtherly
552 * mess with the value.
557 *level
= acpi_video_bqc_value_to_level(device
, *level
);
559 for (i
= 2; i
< device
->brightness
->count
; i
++)
560 if (device
->brightness
->levels
[i
] == *level
) {
561 device
->brightness
->curr
= *level
;
565 * BQC returned an invalid level.
568 ACPI_WARNING((AE_INFO
,
569 "%s returned an invalid level",
571 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
575 * should we return an error or ignore this failure?
576 * dev->brightness->curr is a cached value which stores
577 * the correct current backlight level in most cases.
578 * ACPI video backlight still works w/ buggy _BQC.
579 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
581 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
582 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
586 *level
= device
->brightness
->curr
;
591 acpi_video_device_EDID(struct acpi_video_device
*device
,
592 union acpi_object
**edid
, ssize_t length
)
595 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
596 union acpi_object
*obj
;
597 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
598 struct acpi_object_list args
= { 1, &arg0
};
606 arg0
.integer
.value
= 1;
607 else if (length
== 256)
608 arg0
.integer
.value
= 2;
612 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
613 if (ACPI_FAILURE(status
))
616 obj
= buffer
.pointer
;
618 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
621 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
633 * video : video bus device pointer
635 * 0. The system BIOS should NOT automatically switch(toggle)
636 * the active display output.
637 * 1. The system BIOS should automatically switch (toggle) the
638 * active display output. No switch event.
639 * 2. The _DGS value should be locked.
640 * 3. The system BIOS should not automatically switch (toggle) the
641 * active display output, but instead generate the display switch
644 * 0. The system BIOS should automatically control the brightness level
645 * of the LCD when the power changes from AC to DC
646 * 1. The system BIOS should NOT automatically control the brightness
647 * level of the LCD when the power changes from AC to DC.
653 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
657 if (!video
->cap
._DOS
)
660 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
662 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
663 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
664 (lcd_flag
<< 2) | bios_flag
);
665 if (ACPI_FAILURE(status
))
672 * Simple comparison function used to sort backlight levels.
676 acpi_video_cmp_level(const void *a
, const void *b
)
678 return *(int *)a
- *(int *)b
;
682 * Decides if _BQC/_BCQ for this system is usable
684 * We do this by changing the level first and then read out the current
685 * brightness level, if the value does not match, find out if it is using
686 * index. If not, clear the _BQC/_BCQ capability.
688 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
689 int max_level
, int current_level
)
691 struct acpi_video_device_brightness
*br
= device
->brightness
;
693 unsigned long long level
;
696 /* don't mess with existing known broken systems */
697 if (bqc_offset_aml_bug_workaround
)
701 * Some systems always report current brightness level as maximum
702 * through _BQC, we need to test another value for them.
704 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
706 result
= acpi_video_device_lcd_set_level(device
, test_level
);
710 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
714 if (level
!= test_level
) {
715 /* buggy _BQC found, need to find out if it uses index */
716 if (level
< br
->count
) {
717 if (br
->flags
._BCL_reversed
)
718 level
= br
->count
- 3 - level
;
719 if (br
->levels
[level
+ 2] == test_level
)
720 br
->flags
._BQC_use_index
= 1;
723 if (!br
->flags
._BQC_use_index
)
724 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
733 * device : video output device (LCD, CRT, ..)
736 * Maximum brightness level
738 * Allocate and initialize device->brightness.
742 acpi_video_init_brightness(struct acpi_video_device
*device
)
744 union acpi_object
*obj
= NULL
;
745 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
746 unsigned long long level
, level_old
;
747 union acpi_object
*o
;
748 struct acpi_video_device_brightness
*br
= NULL
;
749 int result
= -EINVAL
;
752 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
753 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
754 "LCD brightness level\n"));
758 if (obj
->package
.count
< 2)
761 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
763 printk(KERN_ERR
"can't allocate memory\n");
768 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
775 for (i
= 0; i
< obj
->package
.count
; i
++) {
776 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
777 if (o
->type
!= ACPI_TYPE_INTEGER
) {
778 printk(KERN_ERR PREFIX
"Invalid data\n");
781 value
= (u32
) o
->integer
.value
;
782 /* Skip duplicate entries */
783 if (count
> 2 && br
->levels
[count
- 1] == value
)
786 br
->levels
[count
] = value
;
788 if (br
->levels
[count
] > max_level
)
789 max_level
= br
->levels
[count
];
794 * some buggy BIOS don't export the levels
795 * when machine is on AC/Battery in _BCL package.
796 * In this case, the first two elements in _BCL packages
797 * are also supported brightness levels that OS should take care of.
799 for (i
= 2; i
< count
; i
++) {
800 if (br
->levels
[i
] == br
->levels
[0])
802 if (br
->levels
[i
] == br
->levels
[1])
806 if (level_ac_battery
< 2) {
807 level_ac_battery
= 2 - level_ac_battery
;
808 br
->flags
._BCL_no_ac_battery_levels
= 1;
809 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
810 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
811 count
+= level_ac_battery
;
812 } else if (level_ac_battery
> 2)
813 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
815 /* Check if the _BCL package is in a reversed order */
816 if (max_level
== br
->levels
[2]) {
817 br
->flags
._BCL_reversed
= 1;
818 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
819 acpi_video_cmp_level
, NULL
);
820 } else if (max_level
!= br
->levels
[count
- 1])
822 "Found unordered _BCL package"));
825 device
->brightness
= br
;
827 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
828 br
->curr
= level
= max_level
;
830 if (!device
->cap
._BQC
)
833 result
= acpi_video_device_lcd_get_level_current(device
,
836 goto out_free_levels
;
838 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
840 goto out_free_levels
;
842 * cap._BQC may get cleared due to _BQC is found to be broken
843 * in acpi_video_bqc_quirk, so check again here.
845 if (!device
->cap
._BQC
)
848 level
= acpi_video_bqc_value_to_level(device
, level_old
);
850 * On some buggy laptops, _BQC returns an uninitialized
851 * value when invoked for the first time, i.e.
852 * level_old is invalid (no matter whether it's a level
853 * or an index). Set the backlight to max_level in this case.
855 for (i
= 2; i
< br
->count
; i
++)
856 if (level
== br
->levels
[i
])
858 if (i
== br
->count
|| !level
)
862 result
= acpi_video_device_lcd_set_level(device
, level
);
864 goto out_free_levels
;
866 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
867 "found %d brightness levels\n", count
- 2));
876 device
->brightness
= NULL
;
883 * device : video output device (LCD, CRT, ..)
888 * Find out all required AML methods defined under the output
892 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
894 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
895 device
->cap
._ADR
= 1;
896 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
897 device
->cap
._BCL
= 1;
898 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
899 device
->cap
._BCM
= 1;
900 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
901 device
->cap
._BQC
= 1;
902 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
903 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
904 device
->cap
._BCQ
= 1;
907 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
908 device
->cap
._DDC
= 1;
913 * device : video output device (VGA)
918 * Find out all required AML methods defined under the video bus device.
921 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
923 if (acpi_has_method(video
->device
->handle
, "_DOS"))
925 if (acpi_has_method(video
->device
->handle
, "_DOD"))
927 if (acpi_has_method(video
->device
->handle
, "_ROM"))
929 if (acpi_has_method(video
->device
->handle
, "_GPD"))
931 if (acpi_has_method(video
->device
->handle
, "_SPD"))
933 if (acpi_has_method(video
->device
->handle
, "_VPO"))
938 * Check whether the video bus device has required AML method to
939 * support the desired features
942 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
944 acpi_status status
= -ENOENT
;
950 dev
= acpi_get_pci_dev(video
->device
->handle
);
956 * Since there is no HID, CID and so on for VGA driver, we have
957 * to check well known required nodes.
960 /* Does this device support video switching? */
961 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
962 if (!video
->cap
._DOS
) {
963 printk(KERN_WARNING FW_BUG
964 "ACPI(%s) defines _DOD but not _DOS\n",
965 acpi_device_bid(video
->device
));
967 video
->flags
.multihead
= 1;
971 /* Does this device support retrieving a video ROM? */
972 if (video
->cap
._ROM
) {
973 video
->flags
.rom
= 1;
977 /* Does this device support configuring which video device to POST? */
978 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
979 video
->flags
.post
= 1;
987 * --------------------------------------------------------------------------
989 * --------------------------------------------------------------------------
992 /* device interface */
993 static struct acpi_video_device_attrib
*
994 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
996 struct acpi_video_enumerated_device
*ids
;
999 for (i
= 0; i
< video
->attached_count
; i
++) {
1000 ids
= &video
->attached_array
[i
];
1001 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1002 return &ids
->value
.attrib
;
1009 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1010 unsigned long device_id
)
1012 struct acpi_video_enumerated_device
*ids
;
1015 for (i
= 0; i
< video
->attached_count
; i
++) {
1016 ids
= &video
->attached_array
[i
];
1017 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1018 return ids
->value
.int_val
;
1025 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1026 struct acpi_video_bus
*video
)
1028 unsigned long long device_id
;
1029 int status
, device_type
;
1030 struct acpi_video_device
*data
;
1031 struct acpi_video_device_attrib
*attribute
;
1034 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1035 /* Some device omits _ADR, we skip them instead of fail */
1036 if (ACPI_FAILURE(status
))
1039 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1043 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1044 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1045 device
->driver_data
= data
;
1047 data
->device_id
= device_id
;
1048 data
->video
= video
;
1050 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1051 acpi_video_switch_brightness
);
1053 attribute
= acpi_video_get_device_attr(video
, device_id
);
1055 if (attribute
&& attribute
->device_id_scheme
) {
1056 switch (attribute
->display_type
) {
1057 case ACPI_VIDEO_DISPLAY_CRT
:
1058 data
->flags
.crt
= 1;
1060 case ACPI_VIDEO_DISPLAY_TV
:
1061 data
->flags
.tvout
= 1;
1063 case ACPI_VIDEO_DISPLAY_DVI
:
1064 data
->flags
.dvi
= 1;
1066 case ACPI_VIDEO_DISPLAY_LCD
:
1067 data
->flags
.lcd
= 1;
1070 data
->flags
.unknown
= 1;
1073 if (attribute
->bios_can_detect
)
1074 data
->flags
.bios
= 1;
1076 /* Check for legacy IDs */
1077 device_type
= acpi_video_get_device_type(video
, device_id
);
1078 /* Ignore bits 16 and 18-20 */
1079 switch (device_type
& 0xffe2ffff) {
1080 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1081 data
->flags
.crt
= 1;
1083 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1084 data
->flags
.lcd
= 1;
1086 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1087 data
->flags
.tvout
= 1;
1090 data
->flags
.unknown
= 1;
1094 acpi_video_device_bind(video
, data
);
1095 acpi_video_device_find_cap(data
);
1097 mutex_lock(&video
->device_list_lock
);
1098 list_add_tail(&data
->entry
, &video
->video_device_list
);
1099 mutex_unlock(&video
->device_list_lock
);
1106 * video : video bus device
1111 * Enumerate the video device list of the video bus,
1112 * bind the ids with the corresponding video devices
1113 * under the video bus.
1116 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1118 struct acpi_video_device
*dev
;
1120 mutex_lock(&video
->device_list_lock
);
1122 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1123 acpi_video_device_bind(video
, dev
);
1125 mutex_unlock(&video
->device_list_lock
);
1130 * video : video bus device
1131 * device : video output device under the video
1137 * Bind the ids with the corresponding video devices
1138 * under the video bus.
1142 acpi_video_device_bind(struct acpi_video_bus
*video
,
1143 struct acpi_video_device
*device
)
1145 struct acpi_video_enumerated_device
*ids
;
1148 for (i
= 0; i
< video
->attached_count
; i
++) {
1149 ids
= &video
->attached_array
[i
];
1150 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1151 ids
->bind_info
= device
;
1152 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1157 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1159 struct acpi_video_bus
*video
= device
->video
;
1162 /* If we have a broken _DOD, no need to test */
1163 if (!video
->attached_count
)
1166 for (i
= 0; i
< video
->attached_count
; i
++) {
1167 if (video
->attached_array
[i
].bind_info
== device
)
1176 * video : video bus device
1181 * Call _DOD to enumerate all devices attached to display adapter
1185 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1190 struct acpi_video_enumerated_device
*active_list
;
1191 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1192 union acpi_object
*dod
= NULL
;
1193 union acpi_object
*obj
;
1195 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1196 if (!ACPI_SUCCESS(status
)) {
1197 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1201 dod
= buffer
.pointer
;
1202 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1203 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1209 dod
->package
.count
));
1211 active_list
= kcalloc(1 + dod
->package
.count
,
1212 sizeof(struct acpi_video_enumerated_device
),
1220 for (i
= 0; i
< dod
->package
.count
; i
++) {
1221 obj
= &dod
->package
.elements
[i
];
1223 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1224 printk(KERN_ERR PREFIX
1225 "Invalid _DOD data in element %d\n", i
);
1229 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1230 active_list
[count
].bind_info
= NULL
;
1231 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1232 (int)obj
->integer
.value
));
1236 kfree(video
->attached_array
);
1238 video
->attached_array
= active_list
;
1239 video
->attached_count
= count
;
1242 kfree(buffer
.pointer
);
1247 acpi_video_get_next_level(struct acpi_video_device
*device
,
1248 u32 level_current
, u32 event
)
1250 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1251 max
= max_below
= 0;
1252 min
= min_above
= 255;
1253 /* Find closest level to level_current */
1254 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1255 l
= device
->brightness
->levels
[i
];
1256 if (abs(l
- level_current
) < abs(delta
)) {
1257 delta
= l
- level_current
;
1262 /* Ajust level_current to closest available level */
1263 level_current
+= delta
;
1264 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1265 l
= device
->brightness
->levels
[i
];
1270 if (l
< min_above
&& l
> level_current
)
1272 if (l
> max_below
&& l
< level_current
)
1277 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1278 return (level_current
< max
) ? min_above
: min
;
1279 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1280 return (level_current
< max
) ? min_above
: max
;
1281 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1282 return (level_current
> min
) ? max_below
: min
;
1283 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1284 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1287 return level_current
;
1292 acpi_video_switch_brightness(struct work_struct
*work
)
1294 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1295 struct acpi_video_device
, switch_brightness_work
);
1296 unsigned long long level_current
, level_next
;
1297 int event
= device
->switch_brightness_event
;
1298 int result
= -EINVAL
;
1300 /* no warning message if acpi_backlight=vendor or a quirk is used */
1301 if (!acpi_video_verify_backlight_support())
1304 if (!device
->brightness
)
1307 result
= acpi_video_device_lcd_get_level_current(device
,
1313 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1315 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1318 backlight_force_update(device
->backlight
,
1319 BACKLIGHT_UPDATE_HOTKEY
);
1323 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1326 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1329 struct acpi_video_bus
*video
;
1330 struct acpi_video_device
*video_device
;
1331 union acpi_object
*buffer
= NULL
;
1335 if (!device
|| !acpi_driver_data(device
))
1338 video
= acpi_driver_data(device
);
1340 for (i
= 0; i
< video
->attached_count
; i
++) {
1341 video_device
= video
->attached_array
[i
].bind_info
;
1347 if (!video_device
->cap
._DDC
)
1352 case ACPI_VIDEO_DISPLAY_CRT
:
1353 if (!video_device
->flags
.crt
)
1356 case ACPI_VIDEO_DISPLAY_TV
:
1357 if (!video_device
->flags
.tvout
)
1360 case ACPI_VIDEO_DISPLAY_DVI
:
1361 if (!video_device
->flags
.dvi
)
1364 case ACPI_VIDEO_DISPLAY_LCD
:
1365 if (!video_device
->flags
.lcd
)
1369 } else if (video_device
->device_id
!= device_id
) {
1373 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1375 if (ACPI_FAILURE(status
) || !buffer
||
1376 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1378 status
= acpi_video_device_EDID(video_device
, &buffer
,
1380 if (ACPI_FAILURE(status
) || !buffer
||
1381 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1386 *edid
= buffer
->buffer
.pointer
;
1392 EXPORT_SYMBOL(acpi_video_get_edid
);
1395 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1396 struct acpi_device
*device
)
1399 struct acpi_device
*dev
;
1402 * There are systems where video module known to work fine regardless
1403 * of broken _DOD and ignoring returned value here doesn't cause
1406 acpi_video_device_enumerate(video
);
1408 list_for_each_entry(dev
, &device
->children
, node
) {
1410 status
= acpi_video_bus_get_one_device(dev
, video
);
1412 dev_err(&dev
->dev
, "Can't attach device\n");
1419 /* acpi_video interface */
1422 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1423 * preform any automatic brightness change on receiving a notification.
1425 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1427 return acpi_video_bus_DOS(video
, 0,
1428 acpi_osi_is_win8() ? 1 : 0);
1431 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1433 return acpi_video_bus_DOS(video
, 0,
1434 acpi_osi_is_win8() ? 0 : 1);
1437 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1439 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1440 struct input_dev
*input
;
1443 if (!video
|| !video
->input
)
1446 input
= video
->input
;
1449 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1450 * most likely via hotkey. */
1451 keycode
= KEY_SWITCHVIDEOMODE
;
1454 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1456 acpi_video_device_enumerate(video
);
1457 acpi_video_device_rebind(video
);
1458 keycode
= KEY_SWITCHVIDEOMODE
;
1461 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1462 keycode
= KEY_SWITCHVIDEOMODE
;
1464 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1465 keycode
= KEY_VIDEO_NEXT
;
1467 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1468 keycode
= KEY_VIDEO_PREV
;
1472 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1473 "Unsupported event [0x%x]\n", event
));
1477 if (acpi_notifier_call_chain(device
, event
, 0))
1478 /* Something vetoed the keypress. */
1482 input_report_key(input
, keycode
, 1);
1484 input_report_key(input
, keycode
, 0);
1491 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1494 if (!brightness_switch_enabled
)
1497 video_device
->switch_brightness_event
= event
;
1498 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1501 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1503 struct acpi_video_device
*video_device
= data
;
1504 struct acpi_device
*device
= NULL
;
1505 struct acpi_video_bus
*bus
;
1506 struct input_dev
*input
;
1512 device
= video_device
->dev
;
1513 bus
= video_device
->video
;
1517 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1518 brightness_switch_event(video_device
, event
);
1519 keycode
= KEY_BRIGHTNESS_CYCLE
;
1521 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1522 brightness_switch_event(video_device
, event
);
1523 keycode
= KEY_BRIGHTNESSUP
;
1525 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1526 brightness_switch_event(video_device
, event
);
1527 keycode
= KEY_BRIGHTNESSDOWN
;
1529 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1530 brightness_switch_event(video_device
, event
);
1531 keycode
= KEY_BRIGHTNESS_ZERO
;
1533 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1534 brightness_switch_event(video_device
, event
);
1535 keycode
= KEY_DISPLAY_OFF
;
1538 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1539 "Unsupported event [0x%x]\n", event
));
1543 acpi_notifier_call_chain(device
, event
, 0);
1546 input_report_key(input
, keycode
, 1);
1548 input_report_key(input
, keycode
, 0);
1555 static int acpi_video_resume(struct notifier_block
*nb
,
1556 unsigned long val
, void *ign
)
1558 struct acpi_video_bus
*video
;
1559 struct acpi_video_device
*video_device
;
1563 case PM_HIBERNATION_PREPARE
:
1564 case PM_SUSPEND_PREPARE
:
1565 case PM_RESTORE_PREPARE
:
1569 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1571 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1573 for (i
= 0; i
< video
->attached_count
; i
++) {
1574 video_device
= video
->attached_array
[i
].bind_info
;
1575 if (video_device
&& video_device
->backlight
)
1576 acpi_video_set_brightness(video_device
->backlight
);
1583 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1584 void **return_value
)
1586 struct acpi_device
*device
= context
;
1587 struct acpi_device
*sibling
;
1590 if (handle
== device
->handle
)
1591 return AE_CTRL_TERMINATE
;
1593 result
= acpi_bus_get_device(handle
, &sibling
);
1597 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1598 return AE_ALREADY_EXISTS
;
1603 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1605 struct backlight_properties props
;
1606 struct pci_dev
*pdev
;
1607 acpi_handle acpi_parent
;
1608 struct device
*parent
= NULL
;
1614 * Do not create backlight device for video output
1615 * device that is not in the enumerated list.
1617 if (!acpi_video_device_in_dod(device
)) {
1618 dev_dbg(&device
->dev
->dev
, "not in _DOD list, ignore\n");
1622 result
= acpi_video_init_brightness(device
);
1625 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1630 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1632 pdev
= acpi_get_pci_dev(acpi_parent
);
1634 parent
= &pdev
->dev
;
1638 memset(&props
, 0, sizeof(struct backlight_properties
));
1639 props
.type
= BACKLIGHT_FIRMWARE
;
1640 props
.max_brightness
= device
->brightness
->count
- 3;
1641 device
->backlight
= backlight_device_register(name
,
1644 &acpi_backlight_ops
,
1647 if (IS_ERR(device
->backlight
))
1651 * Save current brightness level in case we have to restore it
1652 * before acpi_video_device_lcd_set_level() is called next time.
1654 device
->backlight
->props
.brightness
=
1655 acpi_video_get_brightness(device
->backlight
);
1657 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1658 device
->dev
, &video_cooling_ops
);
1659 if (IS_ERR(device
->cooling_dev
)) {
1661 * Set cooling_dev to NULL so we don't crash trying to free it.
1662 * Also, why the hell we are returning early and not attempt to
1663 * register video output if cooling device registration failed?
1666 device
->cooling_dev
= NULL
;
1670 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1671 device
->cooling_dev
->id
);
1672 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1673 &device
->cooling_dev
->device
.kobj
,
1676 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1677 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1678 &device
->dev
->dev
.kobj
, "device");
1680 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1683 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1685 struct acpi_video_device
*dev
;
1687 if (video
->backlight_registered
)
1690 if (!acpi_video_verify_backlight_support())
1693 mutex_lock(&video
->device_list_lock
);
1694 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1695 acpi_video_dev_register_backlight(dev
);
1696 mutex_unlock(&video
->device_list_lock
);
1698 video
->backlight_registered
= true;
1700 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1701 video
->pm_nb
.priority
= 0;
1702 return register_pm_notifier(&video
->pm_nb
);
1705 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1707 if (device
->backlight
) {
1708 backlight_device_unregister(device
->backlight
);
1709 device
->backlight
= NULL
;
1711 if (device
->brightness
) {
1712 kfree(device
->brightness
->levels
);
1713 kfree(device
->brightness
);
1714 device
->brightness
= NULL
;
1716 if (device
->cooling_dev
) {
1717 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1718 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1719 thermal_cooling_device_unregister(device
->cooling_dev
);
1720 device
->cooling_dev
= NULL
;
1724 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1726 struct acpi_video_device
*dev
;
1729 if (!video
->backlight_registered
)
1732 error
= unregister_pm_notifier(&video
->pm_nb
);
1734 mutex_lock(&video
->device_list_lock
);
1735 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1736 acpi_video_dev_unregister_backlight(dev
);
1737 mutex_unlock(&video
->device_list_lock
);
1739 video
->backlight_registered
= false;
1744 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1747 struct acpi_device
*adev
= device
->dev
;
1749 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1750 acpi_video_device_notify
, device
);
1751 if (ACPI_FAILURE(status
))
1752 dev_err(&adev
->dev
, "Error installing notify handler\n");
1754 device
->flags
.notify
= 1;
1757 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1759 struct input_dev
*input
;
1760 struct acpi_video_device
*dev
;
1763 video
->input
= input
= input_allocate_device();
1769 error
= acpi_video_bus_start_devices(video
);
1771 goto err_free_input
;
1773 snprintf(video
->phys
, sizeof(video
->phys
),
1774 "%s/video/input0", acpi_device_hid(video
->device
));
1776 input
->name
= acpi_device_name(video
->device
);
1777 input
->phys
= video
->phys
;
1778 input
->id
.bustype
= BUS_HOST
;
1779 input
->id
.product
= 0x06;
1780 input
->dev
.parent
= &video
->device
->dev
;
1781 input
->evbit
[0] = BIT(EV_KEY
);
1782 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1783 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1784 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1785 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1786 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1787 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1788 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1789 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1791 error
= input_register_device(input
);
1795 mutex_lock(&video
->device_list_lock
);
1796 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1797 acpi_video_dev_add_notify_handler(dev
);
1798 mutex_unlock(&video
->device_list_lock
);
1803 acpi_video_bus_stop_devices(video
);
1805 input_free_device(input
);
1806 video
->input
= NULL
;
1811 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1813 if (dev
->flags
.notify
) {
1814 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1815 acpi_video_device_notify
);
1816 dev
->flags
.notify
= 0;
1820 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1822 struct acpi_video_device
*dev
;
1824 mutex_lock(&video
->device_list_lock
);
1825 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1826 acpi_video_dev_remove_notify_handler(dev
);
1827 mutex_unlock(&video
->device_list_lock
);
1829 acpi_video_bus_stop_devices(video
);
1830 input_unregister_device(video
->input
);
1831 video
->input
= NULL
;
1834 static int acpi_video_backlight_notify(struct notifier_block
*nb
,
1835 unsigned long val
, void *bd
)
1837 struct backlight_device
*backlight
= bd
;
1838 struct acpi_video_bus
*video
;
1840 /* acpi_video_verify_backlight_support only cares about raw devices */
1841 if (backlight
->props
.type
!= BACKLIGHT_RAW
)
1844 video
= container_of(nb
, struct acpi_video_bus
, backlight_nb
);
1847 case BACKLIGHT_REGISTERED
:
1848 if (!acpi_video_verify_backlight_support())
1849 acpi_video_bus_unregister_backlight(video
);
1851 case BACKLIGHT_UNREGISTERED
:
1852 acpi_video_bus_register_backlight(video
);
1859 static int acpi_video_bus_add_backlight_notify_handler(
1860 struct acpi_video_bus
*video
)
1864 video
->backlight_nb
.notifier_call
= acpi_video_backlight_notify
;
1865 video
->backlight_nb
.priority
= 0;
1866 error
= backlight_register_notifier(&video
->backlight_nb
);
1868 video
->backlight_notifier_registered
= true;
1873 static int acpi_video_bus_remove_backlight_notify_handler(
1874 struct acpi_video_bus
*video
)
1876 if (!video
->backlight_notifier_registered
)
1879 video
->backlight_notifier_registered
= false;
1881 return backlight_unregister_notifier(&video
->backlight_nb
);
1884 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1886 struct acpi_video_device
*dev
, *next
;
1888 mutex_lock(&video
->device_list_lock
);
1889 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1890 list_del(&dev
->entry
);
1893 mutex_unlock(&video
->device_list_lock
);
1898 static int instance
;
1900 static int acpi_video_bus_add(struct acpi_device
*device
)
1902 struct acpi_video_bus
*video
;
1906 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1907 device
->parent
->handle
, 1,
1908 acpi_video_bus_match
, NULL
,
1910 if (status
== AE_ALREADY_EXISTS
) {
1911 printk(KERN_WARNING FW_BUG
1912 "Duplicate ACPI video bus devices for the"
1913 " same VGA controller, please try module "
1914 "parameter \"video.allow_duplicates=1\""
1915 "if the current driver doesn't work.\n");
1916 if (!allow_duplicates
)
1920 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1924 /* a hack to fix the duplicate name "VID" problem on T61 */
1925 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1927 device
->pnp
.bus_id
[3] = '0' + instance
;
1930 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1931 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1933 device
->pnp
.bus_id
[3] = '0' + instance
;
1937 video
->device
= device
;
1938 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1939 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1940 device
->driver_data
= video
;
1942 acpi_video_bus_find_cap(video
);
1943 error
= acpi_video_bus_check(video
);
1945 goto err_free_video
;
1947 mutex_init(&video
->device_list_lock
);
1948 INIT_LIST_HEAD(&video
->video_device_list
);
1950 error
= acpi_video_bus_get_devices(video
, device
);
1954 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1955 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1956 video
->flags
.multihead
? "yes" : "no",
1957 video
->flags
.rom
? "yes" : "no",
1958 video
->flags
.post
? "yes" : "no");
1959 mutex_lock(&video_list_lock
);
1960 list_add_tail(&video
->entry
, &video_bus_head
);
1961 mutex_unlock(&video_list_lock
);
1963 acpi_video_bus_register_backlight(video
);
1964 acpi_video_bus_add_notify_handler(video
);
1965 acpi_video_bus_add_backlight_notify_handler(video
);
1970 acpi_video_bus_put_devices(video
);
1971 kfree(video
->attached_array
);
1974 device
->driver_data
= NULL
;
1979 static int acpi_video_bus_remove(struct acpi_device
*device
)
1981 struct acpi_video_bus
*video
= NULL
;
1984 if (!device
|| !acpi_driver_data(device
))
1987 video
= acpi_driver_data(device
);
1989 acpi_video_bus_remove_backlight_notify_handler(video
);
1990 acpi_video_bus_remove_notify_handler(video
);
1991 acpi_video_bus_unregister_backlight(video
);
1992 acpi_video_bus_put_devices(video
);
1994 mutex_lock(&video_list_lock
);
1995 list_del(&video
->entry
);
1996 mutex_unlock(&video_list_lock
);
1998 kfree(video
->attached_array
);
2004 static int __init
is_i740(struct pci_dev
*dev
)
2006 if (dev
->device
== 0x00D1)
2008 if (dev
->device
== 0x7000)
2013 static int __init
intel_opregion_present(void)
2016 struct pci_dev
*dev
= NULL
;
2019 for_each_pci_dev(dev
) {
2020 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2022 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2024 /* We don't want to poke around undefined i740 registers */
2027 pci_read_config_dword(dev
, 0xfc, &address
);
2035 int acpi_video_register(void)
2038 if (register_count
) {
2040 * if the function of acpi_video_register is already called,
2041 * don't register the acpi_vide_bus again and return no error.
2046 mutex_init(&video_list_lock
);
2047 INIT_LIST_HEAD(&video_bus_head
);
2049 result
= acpi_bus_register_driver(&acpi_video_bus
);
2054 * When the acpi_video_bus is loaded successfully, increase
2055 * the counter reference.
2061 EXPORT_SYMBOL(acpi_video_register
);
2063 void acpi_video_unregister(void)
2065 if (!register_count
) {
2067 * If the acpi video bus is already unloaded, don't
2068 * unload it again and return directly.
2072 acpi_bus_unregister_driver(&acpi_video_bus
);
2078 EXPORT_SYMBOL(acpi_video_unregister
);
2080 void acpi_video_unregister_backlight(void)
2082 struct acpi_video_bus
*video
;
2084 if (!register_count
)
2087 mutex_lock(&video_list_lock
);
2088 list_for_each_entry(video
, &video_bus_head
, entry
)
2089 acpi_video_bus_unregister_backlight(video
);
2090 mutex_unlock(&video_list_lock
);
2092 EXPORT_SYMBOL(acpi_video_unregister_backlight
);
2095 * This is kind of nasty. Hardware using Intel chipsets may require
2096 * the video opregion code to be run first in order to initialise
2097 * state before any ACPI video calls are made. To handle this we defer
2098 * registration of the video class until the opregion code has run.
2101 static int __init
acpi_video_init(void)
2103 dmi_check_system(video_dmi_table
);
2105 if (intel_opregion_present())
2108 return acpi_video_register();
2111 static void __exit
acpi_video_exit(void)
2113 acpi_video_unregister();
2118 module_init(acpi_video_init
);
2119 module_exit(acpi_video_exit
);