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
;
159 struct acpi_video_bus_cap cap
;
160 struct acpi_video_bus_flags flags
;
161 struct list_head video_device_list
;
162 struct mutex device_list_lock
; /* protects video_device_list */
163 struct list_head entry
;
164 struct input_dev
*input
;
165 char phys
[32]; /* for input device */
166 struct notifier_block pm_nb
;
167 struct notifier_block backlight_nb
;
170 struct acpi_video_device_flags
{
181 struct acpi_video_device_cap
{
182 u8 _ADR
:1; /* Return the unique ID */
183 u8 _BCL
:1; /* Query list of brightness control levels supported */
184 u8 _BCM
:1; /* Set the brightness level */
185 u8 _BQC
:1; /* Get current brightness level */
186 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
187 u8 _DDC
:1; /* Return the EDID for this device */
190 struct acpi_video_brightness_flags
{
191 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
192 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order */
193 u8 _BQC_use_index
:1; /* _BQC returns an index value */
196 struct acpi_video_device_brightness
{
200 struct acpi_video_brightness_flags flags
;
203 struct acpi_video_device
{
204 unsigned long device_id
;
205 struct acpi_video_device_flags flags
;
206 struct acpi_video_device_cap cap
;
207 struct list_head entry
;
208 struct delayed_work switch_brightness_work
;
209 int switch_brightness_event
;
210 struct acpi_video_bus
*video
;
211 struct acpi_device
*dev
;
212 struct acpi_video_device_brightness
*brightness
;
213 struct backlight_device
*backlight
;
214 struct thermal_cooling_device
*cooling_dev
;
217 static const char device_decode
[][30] = {
218 "motherboard VGA device",
224 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
225 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
226 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
227 struct acpi_video_device
*device
);
228 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
229 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
231 static int acpi_video_device_lcd_get_level_current(
232 struct acpi_video_device
*device
,
233 unsigned long long *level
, bool raw
);
234 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
235 u32 level_current
, u32 event
);
236 static void acpi_video_switch_brightness(struct work_struct
*work
);
238 static bool acpi_video_use_native_backlight(void)
240 if (use_native_backlight_param
!= -1)
241 return use_native_backlight_param
;
243 return use_native_backlight_dmi
;
246 bool acpi_video_verify_backlight_support(void)
248 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
249 backlight_device_registered(BACKLIGHT_RAW
))
251 return acpi_video_backlight_support();
253 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support
);
255 /* backlight device sysfs support */
256 static int acpi_video_get_brightness(struct backlight_device
*bd
)
258 unsigned long long cur_level
;
260 struct acpi_video_device
*vd
= bl_get_data(bd
);
262 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
264 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
265 if (vd
->brightness
->levels
[i
] == cur_level
)
267 * The first two entries are special - see page 575
268 * of the ACPI spec 3.0
275 static int acpi_video_set_brightness(struct backlight_device
*bd
)
277 int request_level
= bd
->props
.brightness
+ 2;
278 struct acpi_video_device
*vd
= bl_get_data(bd
);
280 cancel_delayed_work(&vd
->switch_brightness_work
);
281 return acpi_video_device_lcd_set_level(vd
,
282 vd
->brightness
->levels
[request_level
]);
285 static const struct backlight_ops acpi_backlight_ops
= {
286 .get_brightness
= acpi_video_get_brightness
,
287 .update_status
= acpi_video_set_brightness
,
290 /* thermal cooling device callbacks */
291 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
294 struct acpi_device
*device
= cooling_dev
->devdata
;
295 struct acpi_video_device
*video
= acpi_driver_data(device
);
297 *state
= video
->brightness
->count
- 3;
301 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
304 struct acpi_device
*device
= cooling_dev
->devdata
;
305 struct acpi_video_device
*video
= acpi_driver_data(device
);
306 unsigned long long level
;
309 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
311 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
312 if (level
== video
->brightness
->levels
[offset
]) {
313 *state
= video
->brightness
->count
- offset
- 1;
321 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
323 struct acpi_device
*device
= cooling_dev
->devdata
;
324 struct acpi_video_device
*video
= acpi_driver_data(device
);
327 if (state
>= video
->brightness
->count
- 2)
330 state
= video
->brightness
->count
- state
;
331 level
= video
->brightness
->levels
[state
- 1];
332 return acpi_video_device_lcd_set_level(video
, level
);
335 static const struct thermal_cooling_device_ops video_cooling_ops
= {
336 .get_max_state
= video_get_max_state
,
337 .get_cur_state
= video_get_cur_state
,
338 .set_cur_state
= video_set_cur_state
,
342 * --------------------------------------------------------------------------
344 * --------------------------------------------------------------------------
348 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
349 union acpi_object
**levels
)
352 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
353 union acpi_object
*obj
;
358 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
359 if (!ACPI_SUCCESS(status
))
361 obj
= (union acpi_object
*)buffer
.pointer
;
362 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
363 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
373 kfree(buffer
.pointer
);
379 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
384 status
= acpi_execute_simple_method(device
->dev
->handle
,
386 if (ACPI_FAILURE(status
)) {
387 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
391 device
->brightness
->curr
= level
;
392 for (state
= 2; state
< device
->brightness
->count
; state
++)
393 if (level
== device
->brightness
->levels
[state
]) {
394 if (device
->backlight
)
395 device
->backlight
->props
.brightness
= state
- 2;
399 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
404 * For some buggy _BQC methods, we need to add a constant value to
405 * the _BQC return value to get the actual current brightness level
408 static int bqc_offset_aml_bug_workaround
;
409 static int __init
video_set_bqc_offset(const struct dmi_system_id
*d
)
411 bqc_offset_aml_bug_workaround
= 9;
415 static int __init
video_disable_native_backlight(const struct dmi_system_id
*d
)
417 use_native_backlight_dmi
= false;
421 static struct dmi_system_id video_dmi_table
[] __initdata
= {
423 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
426 .callback
= video_set_bqc_offset
,
427 .ident
= "Acer Aspire 5720",
429 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
430 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
434 .callback
= video_set_bqc_offset
,
435 .ident
= "Acer Aspire 5710Z",
437 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
442 .callback
= video_set_bqc_offset
,
443 .ident
= "eMachines E510",
445 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
446 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
450 .callback
= video_set_bqc_offset
,
451 .ident
= "Acer Aspire 5315",
453 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
454 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
458 .callback
= video_set_bqc_offset
,
459 .ident
= "Acer Aspire 7720",
461 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
467 * These models have a working acpi_video backlight control, and using
468 * native backlight causes a regression where backlight does not work
469 * when userspace is not handling brightness key events. Disable
470 * native_backlight on these to fix this:
471 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
474 .callback
= video_disable_native_backlight
,
475 .ident
= "ThinkPad T420",
477 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
478 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad T420"),
482 .callback
= video_disable_native_backlight
,
483 .ident
= "ThinkPad T520",
485 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
486 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad T520"),
490 .callback
= video_disable_native_backlight
,
491 .ident
= "ThinkPad X201s",
493 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
494 DMI_MATCH(DMI_PRODUCT_VERSION
, "ThinkPad X201s"),
498 /* The native backlight controls do not work on some older machines */
500 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
501 .callback
= video_disable_native_backlight
,
502 .ident
= "HP ENVY 15 Notebook",
504 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
505 DMI_MATCH(DMI_PRODUCT_NAME
, "HP ENVY 15 Notebook PC"),
510 .callback
= video_disable_native_backlight
,
511 .ident
= "SAMSUNG 870Z5E/880Z5E/680Z5E",
513 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
514 DMI_MATCH(DMI_PRODUCT_NAME
, "870Z5E/880Z5E/680Z5E"),
518 .callback
= video_disable_native_backlight
,
519 .ident
= "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
521 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
522 DMI_MATCH(DMI_PRODUCT_NAME
, "370R4E/370R4V/370R5E/3570RE/370R5V"),
526 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
527 .callback
= video_disable_native_backlight
,
528 .ident
= "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
530 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
531 DMI_MATCH(DMI_PRODUCT_NAME
, "3570R/370R/470R/450R/510R/4450RV"),
535 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
536 .callback
= video_disable_native_backlight
,
537 .ident
= "SAMSUNG 730U3E/740U3E",
539 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
540 DMI_MATCH(DMI_PRODUCT_NAME
, "730U3E/740U3E"),
544 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
545 .callback
= video_disable_native_backlight
,
546 .ident
= "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
548 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG ELECTRONICS CO., LTD."),
549 DMI_MATCH(DMI_PRODUCT_NAME
, "900X3C/900X3D/900X3E/900X4C/900X4D"),
554 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
555 .callback
= video_disable_native_backlight
,
556 .ident
= "Dell XPS15 L521X",
558 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
559 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS L521X"),
565 static unsigned long long
566 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
567 unsigned long long bqc_value
)
569 unsigned long long level
;
571 if (device
->brightness
->flags
._BQC_use_index
) {
573 * _BQC returns an index that doesn't account for
574 * the first 2 items with special meaning, so we need
575 * to compensate for that by offsetting ourselves
577 if (device
->brightness
->flags
._BCL_reversed
)
578 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
580 level
= device
->brightness
->levels
[bqc_value
+ 2];
585 level
+= bqc_offset_aml_bug_workaround
;
591 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
592 unsigned long long *level
, bool raw
)
594 acpi_status status
= AE_OK
;
597 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
598 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
600 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
602 if (ACPI_SUCCESS(status
)) {
605 * Caller has indicated he wants the raw
606 * value returned by _BQC, so don't furtherly
607 * mess with the value.
612 *level
= acpi_video_bqc_value_to_level(device
, *level
);
614 for (i
= 2; i
< device
->brightness
->count
; i
++)
615 if (device
->brightness
->levels
[i
] == *level
) {
616 device
->brightness
->curr
= *level
;
620 * BQC returned an invalid level.
623 ACPI_WARNING((AE_INFO
,
624 "%s returned an invalid level",
626 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
630 * should we return an error or ignore this failure?
631 * dev->brightness->curr is a cached value which stores
632 * the correct current backlight level in most cases.
633 * ACPI video backlight still works w/ buggy _BQC.
634 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
636 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
637 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
641 *level
= device
->brightness
->curr
;
646 acpi_video_device_EDID(struct acpi_video_device
*device
,
647 union acpi_object
**edid
, ssize_t length
)
650 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
651 union acpi_object
*obj
;
652 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
653 struct acpi_object_list args
= { 1, &arg0
};
661 arg0
.integer
.value
= 1;
662 else if (length
== 256)
663 arg0
.integer
.value
= 2;
667 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
668 if (ACPI_FAILURE(status
))
671 obj
= buffer
.pointer
;
673 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
676 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
688 * video : video bus device pointer
690 * 0. The system BIOS should NOT automatically switch(toggle)
691 * the active display output.
692 * 1. The system BIOS should automatically switch (toggle) the
693 * active display output. No switch event.
694 * 2. The _DGS value should be locked.
695 * 3. The system BIOS should not automatically switch (toggle) the
696 * active display output, but instead generate the display switch
699 * 0. The system BIOS should automatically control the brightness level
700 * of the LCD when the power changes from AC to DC
701 * 1. The system BIOS should NOT automatically control the brightness
702 * level of the LCD when the power changes from AC to DC.
708 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
712 if (!video
->cap
._DOS
)
715 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
717 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
718 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
719 (lcd_flag
<< 2) | bios_flag
);
720 if (ACPI_FAILURE(status
))
727 * Simple comparison function used to sort backlight levels.
731 acpi_video_cmp_level(const void *a
, const void *b
)
733 return *(int *)a
- *(int *)b
;
737 * Decides if _BQC/_BCQ for this system is usable
739 * We do this by changing the level first and then read out the current
740 * brightness level, if the value does not match, find out if it is using
741 * index. If not, clear the _BQC/_BCQ capability.
743 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
744 int max_level
, int current_level
)
746 struct acpi_video_device_brightness
*br
= device
->brightness
;
748 unsigned long long level
;
751 /* don't mess with existing known broken systems */
752 if (bqc_offset_aml_bug_workaround
)
756 * Some systems always report current brightness level as maximum
757 * through _BQC, we need to test another value for them.
759 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
761 result
= acpi_video_device_lcd_set_level(device
, test_level
);
765 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
769 if (level
!= test_level
) {
770 /* buggy _BQC found, need to find out if it uses index */
771 if (level
< br
->count
) {
772 if (br
->flags
._BCL_reversed
)
773 level
= br
->count
- 3 - level
;
774 if (br
->levels
[level
+ 2] == test_level
)
775 br
->flags
._BQC_use_index
= 1;
778 if (!br
->flags
._BQC_use_index
)
779 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
788 * device : video output device (LCD, CRT, ..)
791 * Maximum brightness level
793 * Allocate and initialize device->brightness.
797 acpi_video_init_brightness(struct acpi_video_device
*device
)
799 union acpi_object
*obj
= NULL
;
800 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
801 unsigned long long level
, level_old
;
802 union acpi_object
*o
;
803 struct acpi_video_device_brightness
*br
= NULL
;
804 int result
= -EINVAL
;
807 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
808 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
809 "LCD brightness level\n"));
813 if (obj
->package
.count
< 2)
816 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
818 printk(KERN_ERR
"can't allocate memory\n");
823 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
830 for (i
= 0; i
< obj
->package
.count
; i
++) {
831 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
832 if (o
->type
!= ACPI_TYPE_INTEGER
) {
833 printk(KERN_ERR PREFIX
"Invalid data\n");
836 value
= (u32
) o
->integer
.value
;
837 /* Skip duplicate entries */
838 if (count
> 2 && br
->levels
[count
- 1] == value
)
841 br
->levels
[count
] = value
;
843 if (br
->levels
[count
] > max_level
)
844 max_level
= br
->levels
[count
];
849 * some buggy BIOS don't export the levels
850 * when machine is on AC/Battery in _BCL package.
851 * In this case, the first two elements in _BCL packages
852 * are also supported brightness levels that OS should take care of.
854 for (i
= 2; i
< count
; i
++) {
855 if (br
->levels
[i
] == br
->levels
[0])
857 if (br
->levels
[i
] == br
->levels
[1])
861 if (level_ac_battery
< 2) {
862 level_ac_battery
= 2 - level_ac_battery
;
863 br
->flags
._BCL_no_ac_battery_levels
= 1;
864 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
865 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
866 count
+= level_ac_battery
;
867 } else if (level_ac_battery
> 2)
868 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
870 /* Check if the _BCL package is in a reversed order */
871 if (max_level
== br
->levels
[2]) {
872 br
->flags
._BCL_reversed
= 1;
873 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
874 acpi_video_cmp_level
, NULL
);
875 } else if (max_level
!= br
->levels
[count
- 1])
877 "Found unordered _BCL package"));
880 device
->brightness
= br
;
882 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
883 br
->curr
= level
= max_level
;
885 if (!device
->cap
._BQC
)
888 result
= acpi_video_device_lcd_get_level_current(device
,
891 goto out_free_levels
;
893 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
895 goto out_free_levels
;
897 * cap._BQC may get cleared due to _BQC is found to be broken
898 * in acpi_video_bqc_quirk, so check again here.
900 if (!device
->cap
._BQC
)
903 level
= acpi_video_bqc_value_to_level(device
, level_old
);
905 * On some buggy laptops, _BQC returns an uninitialized
906 * value when invoked for the first time, i.e.
907 * level_old is invalid (no matter whether it's a level
908 * or an index). Set the backlight to max_level in this case.
910 for (i
= 2; i
< br
->count
; i
++)
911 if (level
== br
->levels
[i
])
913 if (i
== br
->count
|| !level
)
917 result
= acpi_video_device_lcd_set_level(device
, level
);
919 goto out_free_levels
;
921 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
922 "found %d brightness levels\n", count
- 2));
931 device
->brightness
= NULL
;
938 * device : video output device (LCD, CRT, ..)
943 * Find out all required AML methods defined under the output
947 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
949 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
950 device
->cap
._ADR
= 1;
951 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
952 device
->cap
._BCL
= 1;
953 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
954 device
->cap
._BCM
= 1;
955 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
956 device
->cap
._BQC
= 1;
957 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
958 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
959 device
->cap
._BCQ
= 1;
962 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
963 device
->cap
._DDC
= 1;
968 * device : video output device (VGA)
973 * Find out all required AML methods defined under the video bus device.
976 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
978 if (acpi_has_method(video
->device
->handle
, "_DOS"))
980 if (acpi_has_method(video
->device
->handle
, "_DOD"))
982 if (acpi_has_method(video
->device
->handle
, "_ROM"))
984 if (acpi_has_method(video
->device
->handle
, "_GPD"))
986 if (acpi_has_method(video
->device
->handle
, "_SPD"))
988 if (acpi_has_method(video
->device
->handle
, "_VPO"))
993 * Check whether the video bus device has required AML method to
994 * support the desired features
997 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
999 acpi_status status
= -ENOENT
;
1000 struct pci_dev
*dev
;
1005 dev
= acpi_get_pci_dev(video
->device
->handle
);
1011 * Since there is no HID, CID and so on for VGA driver, we have
1012 * to check well known required nodes.
1015 /* Does this device support video switching? */
1016 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1017 if (!video
->cap
._DOS
) {
1018 printk(KERN_WARNING FW_BUG
1019 "ACPI(%s) defines _DOD but not _DOS\n",
1020 acpi_device_bid(video
->device
));
1022 video
->flags
.multihead
= 1;
1026 /* Does this device support retrieving a video ROM? */
1027 if (video
->cap
._ROM
) {
1028 video
->flags
.rom
= 1;
1032 /* Does this device support configuring which video device to POST? */
1033 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1034 video
->flags
.post
= 1;
1042 * --------------------------------------------------------------------------
1044 * --------------------------------------------------------------------------
1047 /* device interface */
1048 static struct acpi_video_device_attrib
*
1049 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1051 struct acpi_video_enumerated_device
*ids
;
1054 for (i
= 0; i
< video
->attached_count
; i
++) {
1055 ids
= &video
->attached_array
[i
];
1056 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1057 return &ids
->value
.attrib
;
1064 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1065 unsigned long device_id
)
1067 struct acpi_video_enumerated_device
*ids
;
1070 for (i
= 0; i
< video
->attached_count
; i
++) {
1071 ids
= &video
->attached_array
[i
];
1072 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1073 return ids
->value
.int_val
;
1080 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1081 struct acpi_video_bus
*video
)
1083 unsigned long long device_id
;
1084 int status
, device_type
;
1085 struct acpi_video_device
*data
;
1086 struct acpi_video_device_attrib
*attribute
;
1089 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1090 /* Some device omits _ADR, we skip them instead of fail */
1091 if (ACPI_FAILURE(status
))
1094 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1098 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1099 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1100 device
->driver_data
= data
;
1102 data
->device_id
= device_id
;
1103 data
->video
= video
;
1105 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1106 acpi_video_switch_brightness
);
1108 attribute
= acpi_video_get_device_attr(video
, device_id
);
1110 if (attribute
&& attribute
->device_id_scheme
) {
1111 switch (attribute
->display_type
) {
1112 case ACPI_VIDEO_DISPLAY_CRT
:
1113 data
->flags
.crt
= 1;
1115 case ACPI_VIDEO_DISPLAY_TV
:
1116 data
->flags
.tvout
= 1;
1118 case ACPI_VIDEO_DISPLAY_DVI
:
1119 data
->flags
.dvi
= 1;
1121 case ACPI_VIDEO_DISPLAY_LCD
:
1122 data
->flags
.lcd
= 1;
1125 data
->flags
.unknown
= 1;
1128 if (attribute
->bios_can_detect
)
1129 data
->flags
.bios
= 1;
1131 /* Check for legacy IDs */
1132 device_type
= acpi_video_get_device_type(video
, device_id
);
1133 /* Ignore bits 16 and 18-20 */
1134 switch (device_type
& 0xffe2ffff) {
1135 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1136 data
->flags
.crt
= 1;
1138 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1139 data
->flags
.lcd
= 1;
1141 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1142 data
->flags
.tvout
= 1;
1145 data
->flags
.unknown
= 1;
1149 acpi_video_device_bind(video
, data
);
1150 acpi_video_device_find_cap(data
);
1152 mutex_lock(&video
->device_list_lock
);
1153 list_add_tail(&data
->entry
, &video
->video_device_list
);
1154 mutex_unlock(&video
->device_list_lock
);
1161 * video : video bus device
1166 * Enumerate the video device list of the video bus,
1167 * bind the ids with the corresponding video devices
1168 * under the video bus.
1171 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1173 struct acpi_video_device
*dev
;
1175 mutex_lock(&video
->device_list_lock
);
1177 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1178 acpi_video_device_bind(video
, dev
);
1180 mutex_unlock(&video
->device_list_lock
);
1185 * video : video bus device
1186 * device : video output device under the video
1192 * Bind the ids with the corresponding video devices
1193 * under the video bus.
1197 acpi_video_device_bind(struct acpi_video_bus
*video
,
1198 struct acpi_video_device
*device
)
1200 struct acpi_video_enumerated_device
*ids
;
1203 for (i
= 0; i
< video
->attached_count
; i
++) {
1204 ids
= &video
->attached_array
[i
];
1205 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1206 ids
->bind_info
= device
;
1207 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1212 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1214 struct acpi_video_bus
*video
= device
->video
;
1218 * If we have a broken _DOD or we have more than 8 output devices
1219 * under the graphics controller node that we can't proper deal with
1220 * in the operation region code currently, no need to test.
1222 if (!video
->attached_count
|| video
->child_count
> 8)
1225 for (i
= 0; i
< video
->attached_count
; i
++) {
1226 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1227 (device
->device_id
& 0xfff))
1236 * video : video bus device
1241 * Call _DOD to enumerate all devices attached to display adapter
1245 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1250 struct acpi_video_enumerated_device
*active_list
;
1251 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1252 union acpi_object
*dod
= NULL
;
1253 union acpi_object
*obj
;
1255 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1256 if (!ACPI_SUCCESS(status
)) {
1257 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1261 dod
= buffer
.pointer
;
1262 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1263 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1268 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1269 dod
->package
.count
));
1271 active_list
= kcalloc(1 + dod
->package
.count
,
1272 sizeof(struct acpi_video_enumerated_device
),
1280 for (i
= 0; i
< dod
->package
.count
; i
++) {
1281 obj
= &dod
->package
.elements
[i
];
1283 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1284 printk(KERN_ERR PREFIX
1285 "Invalid _DOD data in element %d\n", i
);
1289 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1290 active_list
[count
].bind_info
= NULL
;
1291 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1292 (int)obj
->integer
.value
));
1296 kfree(video
->attached_array
);
1298 video
->attached_array
= active_list
;
1299 video
->attached_count
= count
;
1302 kfree(buffer
.pointer
);
1307 acpi_video_get_next_level(struct acpi_video_device
*device
,
1308 u32 level_current
, u32 event
)
1310 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1311 max
= max_below
= 0;
1312 min
= min_above
= 255;
1313 /* Find closest level to level_current */
1314 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1315 l
= device
->brightness
->levels
[i
];
1316 if (abs(l
- level_current
) < abs(delta
)) {
1317 delta
= l
- level_current
;
1322 /* Ajust level_current to closest available level */
1323 level_current
+= delta
;
1324 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1325 l
= device
->brightness
->levels
[i
];
1330 if (l
< min_above
&& l
> level_current
)
1332 if (l
> max_below
&& l
< level_current
)
1337 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1338 return (level_current
< max
) ? min_above
: min
;
1339 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1340 return (level_current
< max
) ? min_above
: max
;
1341 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1342 return (level_current
> min
) ? max_below
: min
;
1343 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1344 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1347 return level_current
;
1352 acpi_video_switch_brightness(struct work_struct
*work
)
1354 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1355 struct acpi_video_device
, switch_brightness_work
);
1356 unsigned long long level_current
, level_next
;
1357 int event
= device
->switch_brightness_event
;
1358 int result
= -EINVAL
;
1360 /* no warning message if acpi_backlight=vendor or a quirk is used */
1361 if (!acpi_video_verify_backlight_support())
1364 if (!device
->brightness
)
1367 result
= acpi_video_device_lcd_get_level_current(device
,
1373 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1375 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1378 backlight_force_update(device
->backlight
,
1379 BACKLIGHT_UPDATE_HOTKEY
);
1383 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1386 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1389 struct acpi_video_bus
*video
;
1390 struct acpi_video_device
*video_device
;
1391 union acpi_object
*buffer
= NULL
;
1395 if (!device
|| !acpi_driver_data(device
))
1398 video
= acpi_driver_data(device
);
1400 for (i
= 0; i
< video
->attached_count
; i
++) {
1401 video_device
= video
->attached_array
[i
].bind_info
;
1407 if (!video_device
->cap
._DDC
)
1412 case ACPI_VIDEO_DISPLAY_CRT
:
1413 if (!video_device
->flags
.crt
)
1416 case ACPI_VIDEO_DISPLAY_TV
:
1417 if (!video_device
->flags
.tvout
)
1420 case ACPI_VIDEO_DISPLAY_DVI
:
1421 if (!video_device
->flags
.dvi
)
1424 case ACPI_VIDEO_DISPLAY_LCD
:
1425 if (!video_device
->flags
.lcd
)
1429 } else if (video_device
->device_id
!= device_id
) {
1433 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1435 if (ACPI_FAILURE(status
) || !buffer
||
1436 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1438 status
= acpi_video_device_EDID(video_device
, &buffer
,
1440 if (ACPI_FAILURE(status
) || !buffer
||
1441 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1446 *edid
= buffer
->buffer
.pointer
;
1452 EXPORT_SYMBOL(acpi_video_get_edid
);
1455 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1456 struct acpi_device
*device
)
1459 struct acpi_device
*dev
;
1462 * There are systems where video module known to work fine regardless
1463 * of broken _DOD and ignoring returned value here doesn't cause
1466 acpi_video_device_enumerate(video
);
1468 list_for_each_entry(dev
, &device
->children
, node
) {
1470 status
= acpi_video_bus_get_one_device(dev
, video
);
1472 dev_err(&dev
->dev
, "Can't attach device\n");
1475 video
->child_count
++;
1480 /* acpi_video interface */
1483 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1484 * preform any automatic brightness change on receiving a notification.
1486 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1488 return acpi_video_bus_DOS(video
, 0,
1489 acpi_osi_is_win8() ? 1 : 0);
1492 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1494 return acpi_video_bus_DOS(video
, 0,
1495 acpi_osi_is_win8() ? 0 : 1);
1498 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1500 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1501 struct input_dev
*input
;
1504 if (!video
|| !video
->input
)
1507 input
= video
->input
;
1510 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1511 * most likely via hotkey. */
1512 keycode
= KEY_SWITCHVIDEOMODE
;
1515 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1517 acpi_video_device_enumerate(video
);
1518 acpi_video_device_rebind(video
);
1519 keycode
= KEY_SWITCHVIDEOMODE
;
1522 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1523 keycode
= KEY_SWITCHVIDEOMODE
;
1525 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1526 keycode
= KEY_VIDEO_NEXT
;
1528 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1529 keycode
= KEY_VIDEO_PREV
;
1533 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1534 "Unsupported event [0x%x]\n", event
));
1538 if (acpi_notifier_call_chain(device
, event
, 0))
1539 /* Something vetoed the keypress. */
1543 input_report_key(input
, keycode
, 1);
1545 input_report_key(input
, keycode
, 0);
1552 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1555 if (!brightness_switch_enabled
)
1558 video_device
->switch_brightness_event
= event
;
1559 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1562 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1564 struct acpi_video_device
*video_device
= data
;
1565 struct acpi_device
*device
= NULL
;
1566 struct acpi_video_bus
*bus
;
1567 struct input_dev
*input
;
1573 device
= video_device
->dev
;
1574 bus
= video_device
->video
;
1578 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1579 brightness_switch_event(video_device
, event
);
1580 keycode
= KEY_BRIGHTNESS_CYCLE
;
1582 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1583 brightness_switch_event(video_device
, event
);
1584 keycode
= KEY_BRIGHTNESSUP
;
1586 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1587 brightness_switch_event(video_device
, event
);
1588 keycode
= KEY_BRIGHTNESSDOWN
;
1590 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1591 brightness_switch_event(video_device
, event
);
1592 keycode
= KEY_BRIGHTNESS_ZERO
;
1594 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1595 brightness_switch_event(video_device
, event
);
1596 keycode
= KEY_DISPLAY_OFF
;
1599 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1600 "Unsupported event [0x%x]\n", event
));
1604 acpi_notifier_call_chain(device
, event
, 0);
1607 input_report_key(input
, keycode
, 1);
1609 input_report_key(input
, keycode
, 0);
1616 static int acpi_video_resume(struct notifier_block
*nb
,
1617 unsigned long val
, void *ign
)
1619 struct acpi_video_bus
*video
;
1620 struct acpi_video_device
*video_device
;
1624 case PM_HIBERNATION_PREPARE
:
1625 case PM_SUSPEND_PREPARE
:
1626 case PM_RESTORE_PREPARE
:
1630 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1632 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1634 for (i
= 0; i
< video
->attached_count
; i
++) {
1635 video_device
= video
->attached_array
[i
].bind_info
;
1636 if (video_device
&& video_device
->backlight
)
1637 acpi_video_set_brightness(video_device
->backlight
);
1644 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1645 void **return_value
)
1647 struct acpi_device
*device
= context
;
1648 struct acpi_device
*sibling
;
1651 if (handle
== device
->handle
)
1652 return AE_CTRL_TERMINATE
;
1654 result
= acpi_bus_get_device(handle
, &sibling
);
1658 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1659 return AE_ALREADY_EXISTS
;
1664 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1666 struct backlight_properties props
;
1667 struct pci_dev
*pdev
;
1668 acpi_handle acpi_parent
;
1669 struct device
*parent
= NULL
;
1675 * Do not create backlight device for video output
1676 * device that is not in the enumerated list.
1678 if (!acpi_video_device_in_dod(device
)) {
1679 dev_dbg(&device
->dev
->dev
, "not in _DOD list, ignore\n");
1683 result
= acpi_video_init_brightness(device
);
1686 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1691 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1693 pdev
= acpi_get_pci_dev(acpi_parent
);
1695 parent
= &pdev
->dev
;
1699 memset(&props
, 0, sizeof(struct backlight_properties
));
1700 props
.type
= BACKLIGHT_FIRMWARE
;
1701 props
.max_brightness
= device
->brightness
->count
- 3;
1702 device
->backlight
= backlight_device_register(name
,
1705 &acpi_backlight_ops
,
1708 if (IS_ERR(device
->backlight
))
1712 * Save current brightness level in case we have to restore it
1713 * before acpi_video_device_lcd_set_level() is called next time.
1715 device
->backlight
->props
.brightness
=
1716 acpi_video_get_brightness(device
->backlight
);
1718 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1719 device
->dev
, &video_cooling_ops
);
1720 if (IS_ERR(device
->cooling_dev
)) {
1722 * Set cooling_dev to NULL so we don't crash trying to free it.
1723 * Also, why the hell we are returning early and not attempt to
1724 * register video output if cooling device registration failed?
1727 device
->cooling_dev
= NULL
;
1731 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1732 device
->cooling_dev
->id
);
1733 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1734 &device
->cooling_dev
->device
.kobj
,
1737 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1738 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1739 &device
->dev
->dev
.kobj
, "device");
1741 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1744 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1746 struct acpi_video_device
*dev
;
1747 union acpi_object
*levels
;
1749 mutex_lock(&video
->device_list_lock
);
1750 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1751 if (!acpi_video_device_lcd_query_levels(dev
, &levels
))
1754 mutex_unlock(&video
->device_list_lock
);
1757 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1759 struct acpi_video_device
*dev
;
1761 if (video
->backlight_registered
)
1764 acpi_video_run_bcl_for_osi(video
);
1766 if (!acpi_video_verify_backlight_support())
1769 mutex_lock(&video
->device_list_lock
);
1770 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1771 acpi_video_dev_register_backlight(dev
);
1772 mutex_unlock(&video
->device_list_lock
);
1774 video
->backlight_registered
= true;
1776 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1777 video
->pm_nb
.priority
= 0;
1778 return register_pm_notifier(&video
->pm_nb
);
1781 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1783 if (device
->backlight
) {
1784 backlight_device_unregister(device
->backlight
);
1785 device
->backlight
= NULL
;
1787 if (device
->brightness
) {
1788 kfree(device
->brightness
->levels
);
1789 kfree(device
->brightness
);
1790 device
->brightness
= NULL
;
1792 if (device
->cooling_dev
) {
1793 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1794 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1795 thermal_cooling_device_unregister(device
->cooling_dev
);
1796 device
->cooling_dev
= NULL
;
1800 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1802 struct acpi_video_device
*dev
;
1805 if (!video
->backlight_registered
)
1808 error
= unregister_pm_notifier(&video
->pm_nb
);
1810 mutex_lock(&video
->device_list_lock
);
1811 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1812 acpi_video_dev_unregister_backlight(dev
);
1813 mutex_unlock(&video
->device_list_lock
);
1815 video
->backlight_registered
= false;
1820 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1823 struct acpi_device
*adev
= device
->dev
;
1825 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1826 acpi_video_device_notify
, device
);
1827 if (ACPI_FAILURE(status
))
1828 dev_err(&adev
->dev
, "Error installing notify handler\n");
1830 device
->flags
.notify
= 1;
1833 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1835 struct input_dev
*input
;
1836 struct acpi_video_device
*dev
;
1839 video
->input
= input
= input_allocate_device();
1845 error
= acpi_video_bus_start_devices(video
);
1847 goto err_free_input
;
1849 snprintf(video
->phys
, sizeof(video
->phys
),
1850 "%s/video/input0", acpi_device_hid(video
->device
));
1852 input
->name
= acpi_device_name(video
->device
);
1853 input
->phys
= video
->phys
;
1854 input
->id
.bustype
= BUS_HOST
;
1855 input
->id
.product
= 0x06;
1856 input
->dev
.parent
= &video
->device
->dev
;
1857 input
->evbit
[0] = BIT(EV_KEY
);
1858 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1859 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1860 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1861 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1862 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1863 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1864 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1865 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1867 error
= input_register_device(input
);
1871 mutex_lock(&video
->device_list_lock
);
1872 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1873 acpi_video_dev_add_notify_handler(dev
);
1874 mutex_unlock(&video
->device_list_lock
);
1879 acpi_video_bus_stop_devices(video
);
1881 input_free_device(input
);
1882 video
->input
= NULL
;
1887 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1889 if (dev
->flags
.notify
) {
1890 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1891 acpi_video_device_notify
);
1892 dev
->flags
.notify
= 0;
1896 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1898 struct acpi_video_device
*dev
;
1900 mutex_lock(&video
->device_list_lock
);
1901 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1902 acpi_video_dev_remove_notify_handler(dev
);
1903 mutex_unlock(&video
->device_list_lock
);
1905 acpi_video_bus_stop_devices(video
);
1906 input_unregister_device(video
->input
);
1907 video
->input
= NULL
;
1910 static int acpi_video_backlight_notify(struct notifier_block
*nb
,
1911 unsigned long val
, void *bd
)
1913 struct backlight_device
*backlight
= bd
;
1914 struct acpi_video_bus
*video
;
1916 /* acpi_video_verify_backlight_support only cares about raw devices */
1917 if (backlight
->props
.type
!= BACKLIGHT_RAW
)
1920 video
= container_of(nb
, struct acpi_video_bus
, backlight_nb
);
1923 case BACKLIGHT_REGISTERED
:
1924 if (!acpi_video_verify_backlight_support())
1925 acpi_video_bus_unregister_backlight(video
);
1927 case BACKLIGHT_UNREGISTERED
:
1928 acpi_video_bus_register_backlight(video
);
1935 static int acpi_video_bus_add_backlight_notify_handler(
1936 struct acpi_video_bus
*video
)
1940 video
->backlight_nb
.notifier_call
= acpi_video_backlight_notify
;
1941 video
->backlight_nb
.priority
= 0;
1942 error
= backlight_register_notifier(&video
->backlight_nb
);
1944 video
->backlight_notifier_registered
= true;
1949 static int acpi_video_bus_remove_backlight_notify_handler(
1950 struct acpi_video_bus
*video
)
1952 if (!video
->backlight_notifier_registered
)
1955 video
->backlight_notifier_registered
= false;
1957 return backlight_unregister_notifier(&video
->backlight_nb
);
1960 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1962 struct acpi_video_device
*dev
, *next
;
1964 mutex_lock(&video
->device_list_lock
);
1965 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1966 list_del(&dev
->entry
);
1969 mutex_unlock(&video
->device_list_lock
);
1974 static int instance
;
1976 static int acpi_video_bus_add(struct acpi_device
*device
)
1978 struct acpi_video_bus
*video
;
1982 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1983 device
->parent
->handle
, 1,
1984 acpi_video_bus_match
, NULL
,
1986 if (status
== AE_ALREADY_EXISTS
) {
1987 printk(KERN_WARNING FW_BUG
1988 "Duplicate ACPI video bus devices for the"
1989 " same VGA controller, please try module "
1990 "parameter \"video.allow_duplicates=1\""
1991 "if the current driver doesn't work.\n");
1992 if (!allow_duplicates
)
1996 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
2000 /* a hack to fix the duplicate name "VID" problem on T61 */
2001 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
2003 device
->pnp
.bus_id
[3] = '0' + instance
;
2006 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2007 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
2009 device
->pnp
.bus_id
[3] = '0' + instance
;
2013 video
->device
= device
;
2014 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
2015 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
2016 device
->driver_data
= video
;
2018 acpi_video_bus_find_cap(video
);
2019 error
= acpi_video_bus_check(video
);
2021 goto err_free_video
;
2023 mutex_init(&video
->device_list_lock
);
2024 INIT_LIST_HEAD(&video
->video_device_list
);
2026 error
= acpi_video_bus_get_devices(video
, device
);
2030 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
2031 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
2032 video
->flags
.multihead
? "yes" : "no",
2033 video
->flags
.rom
? "yes" : "no",
2034 video
->flags
.post
? "yes" : "no");
2035 mutex_lock(&video_list_lock
);
2036 list_add_tail(&video
->entry
, &video_bus_head
);
2037 mutex_unlock(&video_list_lock
);
2039 acpi_video_bus_register_backlight(video
);
2040 acpi_video_bus_add_notify_handler(video
);
2041 acpi_video_bus_add_backlight_notify_handler(video
);
2046 acpi_video_bus_put_devices(video
);
2047 kfree(video
->attached_array
);
2050 device
->driver_data
= NULL
;
2055 static int acpi_video_bus_remove(struct acpi_device
*device
)
2057 struct acpi_video_bus
*video
= NULL
;
2060 if (!device
|| !acpi_driver_data(device
))
2063 video
= acpi_driver_data(device
);
2065 acpi_video_bus_remove_backlight_notify_handler(video
);
2066 acpi_video_bus_remove_notify_handler(video
);
2067 acpi_video_bus_unregister_backlight(video
);
2068 acpi_video_bus_put_devices(video
);
2070 mutex_lock(&video_list_lock
);
2071 list_del(&video
->entry
);
2072 mutex_unlock(&video_list_lock
);
2074 kfree(video
->attached_array
);
2080 static int __init
is_i740(struct pci_dev
*dev
)
2082 if (dev
->device
== 0x00D1)
2084 if (dev
->device
== 0x7000)
2089 static int __init
intel_opregion_present(void)
2092 struct pci_dev
*dev
= NULL
;
2095 for_each_pci_dev(dev
) {
2096 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2098 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2100 /* We don't want to poke around undefined i740 registers */
2103 pci_read_config_dword(dev
, 0xfc, &address
);
2111 int acpi_video_register(void)
2115 if (register_count
) {
2117 * if the function of acpi_video_register is already called,
2118 * don't register the acpi_vide_bus again and return no error.
2123 mutex_init(&video_list_lock
);
2124 INIT_LIST_HEAD(&video_bus_head
);
2126 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2131 * When the acpi_video_bus is loaded successfully, increase
2132 * the counter reference.
2138 EXPORT_SYMBOL(acpi_video_register
);
2140 void acpi_video_unregister(void)
2142 if (!register_count
) {
2144 * If the acpi video bus is already unloaded, don't
2145 * unload it again and return directly.
2149 acpi_bus_unregister_driver(&acpi_video_bus
);
2155 EXPORT_SYMBOL(acpi_video_unregister
);
2157 void acpi_video_unregister_backlight(void)
2159 struct acpi_video_bus
*video
;
2161 if (!register_count
)
2164 mutex_lock(&video_list_lock
);
2165 list_for_each_entry(video
, &video_bus_head
, entry
)
2166 acpi_video_bus_unregister_backlight(video
);
2167 mutex_unlock(&video_list_lock
);
2169 EXPORT_SYMBOL(acpi_video_unregister_backlight
);
2172 * This is kind of nasty. Hardware using Intel chipsets may require
2173 * the video opregion code to be run first in order to initialise
2174 * state before any ACPI video calls are made. To handle this we defer
2175 * registration of the video class until the opregion code has run.
2178 static int __init
acpi_video_init(void)
2181 * Let the module load even if ACPI is disabled (e.g. due to
2182 * a broken BIOS) so that i915.ko can still be loaded on such
2183 * old systems without an AcpiOpRegion.
2185 * acpi_video_register() will report -ENODEV later as well due
2186 * to acpi_disabled when i915.ko tries to register itself afterwards.
2191 dmi_check_system(video_dmi_table
);
2193 if (intel_opregion_present())
2196 return acpi_video_register();
2199 static void __exit
acpi_video_exit(void)
2201 acpi_video_unregister();
2206 module_init(acpi_video_init
);
2207 module_exit(acpi_video_exit
);