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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/input.h>
30 #include <linux/backlight.h>
31 #include <linux/thermal.h>
32 #include <linux/sort.h>
33 #include <linux/pci.h>
34 #include <linux/pci_ids.h>
35 #include <linux/slab.h>
36 #include <linux/dmi.h>
37 #include <linux/suspend.h>
38 #include <linux/acpi.h>
39 #include <acpi/video.h>
40 #include <asm/uaccess.h>
42 #define PREFIX "ACPI: "
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
46 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
47 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
48 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
58 #define MAX_NAME_LEN 20
60 #define _COMPONENT ACPI_VIDEO_COMPONENT
61 ACPI_MODULE_NAME("video");
63 MODULE_AUTHOR("Bruno Ducrot");
64 MODULE_DESCRIPTION("ACPI Video Driver");
65 MODULE_LICENSE("GPL");
67 static bool brightness_switch_enabled
= 1;
68 module_param(brightness_switch_enabled
, bool, 0644);
71 * By default, we don't allow duplicate ACPI video bus devices
72 * under the same VGA controller
74 static bool allow_duplicates
;
75 module_param(allow_duplicates
, bool, 0644);
77 static int disable_backlight_sysfs_if
= -1;
78 module_param(disable_backlight_sysfs_if
, int, 0444);
80 #define REPORT_OUTPUT_KEY_EVENTS 0x01
81 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
82 static int report_key_events
= -1;
83 module_param(report_key_events
, int, 0644);
84 MODULE_PARM_DESC(report_key_events
,
85 "0: none, 1: output changes, 2: brightness changes, 3: all");
87 static bool device_id_scheme
= false;
88 module_param(device_id_scheme
, bool, 0444);
90 static bool only_lcd
= false;
91 module_param(only_lcd
, bool, 0444);
93 static int register_count
;
94 static DEFINE_MUTEX(register_count_mutex
);
95 static DEFINE_MUTEX(video_list_lock
);
96 static LIST_HEAD(video_bus_head
);
97 static int acpi_video_bus_add(struct acpi_device
*device
);
98 static int acpi_video_bus_remove(struct acpi_device
*device
);
99 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
100 void acpi_video_detect_exit(void);
102 static const struct acpi_device_id video_device_ids
[] = {
106 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
108 static struct acpi_driver acpi_video_bus
= {
110 .class = ACPI_VIDEO_CLASS
,
111 .ids
= video_device_ids
,
113 .add
= acpi_video_bus_add
,
114 .remove
= acpi_video_bus_remove
,
115 .notify
= acpi_video_bus_notify
,
119 struct acpi_video_bus_flags
{
120 u8 multihead
:1; /* can switch video heads */
121 u8 rom
:1; /* can retrieve a video rom */
122 u8 post
:1; /* can configure the head to */
126 struct acpi_video_bus_cap
{
127 u8 _DOS
:1; /* Enable/Disable output switching */
128 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
129 u8 _ROM
:1; /* Get ROM Data */
130 u8 _GPD
:1; /* Get POST Device */
131 u8 _SPD
:1; /* Set POST Device */
132 u8 _VPO
:1; /* Video POST Options */
136 struct acpi_video_device_attrib
{
137 u32 display_index
:4; /* A zero-based instance of the Display */
138 u32 display_port_attachment
:4; /* This field differentiates the display type */
139 u32 display_type
:4; /* Describe the specific type in use */
140 u32 vendor_specific
:4; /* Chipset Vendor Specific */
141 u32 bios_can_detect
:1; /* BIOS can detect the device */
142 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
144 u32 pipe_id
:3; /* For VGA multiple-head devices. */
145 u32 reserved
:10; /* Must be 0 */
146 u32 device_id_scheme
:1; /* Device ID Scheme */
149 struct acpi_video_enumerated_device
{
152 struct acpi_video_device_attrib attrib
;
154 struct acpi_video_device
*bind_info
;
157 struct acpi_video_bus
{
158 struct acpi_device
*device
;
159 bool backlight_registered
;
161 struct acpi_video_enumerated_device
*attached_array
;
164 struct acpi_video_bus_cap cap
;
165 struct acpi_video_bus_flags flags
;
166 struct list_head video_device_list
;
167 struct mutex device_list_lock
; /* protects video_device_list */
168 struct list_head entry
;
169 struct input_dev
*input
;
170 char phys
[32]; /* for input device */
171 struct notifier_block pm_nb
;
174 struct acpi_video_device_flags
{
185 struct acpi_video_device_cap
{
186 u8 _ADR
:1; /* Return the unique ID */
187 u8 _BCL
:1; /* Query list of brightness control levels supported */
188 u8 _BCM
:1; /* Set the brightness level */
189 u8 _BQC
:1; /* Get current brightness level */
190 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC
:1; /* Return the EDID for this device */
194 struct acpi_video_brightness_flags
{
195 u8 _BCL_no_ac_battery_levels
:1; /* no AC/Battery levels in _BCL */
196 u8 _BCL_reversed
:1; /* _BCL package is in a reversed order */
197 u8 _BQC_use_index
:1; /* _BQC returns an index value */
200 struct acpi_video_device_brightness
{
204 struct acpi_video_brightness_flags flags
;
207 struct acpi_video_device
{
208 unsigned long device_id
;
209 struct acpi_video_device_flags flags
;
210 struct acpi_video_device_cap cap
;
211 struct list_head entry
;
212 struct delayed_work switch_brightness_work
;
213 int switch_brightness_event
;
214 struct acpi_video_bus
*video
;
215 struct acpi_device
*dev
;
216 struct acpi_video_device_brightness
*brightness
;
217 struct backlight_device
*backlight
;
218 struct thermal_cooling_device
*cooling_dev
;
221 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
222 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
223 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
224 struct acpi_video_device
*device
);
225 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device
*device
,
230 unsigned long long *level
, bool raw
);
231 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
232 u32 level_current
, u32 event
);
233 static void acpi_video_switch_brightness(struct work_struct
*work
);
235 /* backlight device sysfs support */
236 static int acpi_video_get_brightness(struct backlight_device
*bd
)
238 unsigned long long cur_level
;
240 struct acpi_video_device
*vd
= bl_get_data(bd
);
242 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
244 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
245 if (vd
->brightness
->levels
[i
] == cur_level
)
247 * The first two entries are special - see page 575
248 * of the ACPI spec 3.0
255 static int acpi_video_set_brightness(struct backlight_device
*bd
)
257 int request_level
= bd
->props
.brightness
+ 2;
258 struct acpi_video_device
*vd
= bl_get_data(bd
);
260 cancel_delayed_work(&vd
->switch_brightness_work
);
261 return acpi_video_device_lcd_set_level(vd
,
262 vd
->brightness
->levels
[request_level
]);
265 static const struct backlight_ops acpi_backlight_ops
= {
266 .get_brightness
= acpi_video_get_brightness
,
267 .update_status
= acpi_video_set_brightness
,
270 /* thermal cooling device callbacks */
271 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
274 struct acpi_device
*device
= cooling_dev
->devdata
;
275 struct acpi_video_device
*video
= acpi_driver_data(device
);
277 *state
= video
->brightness
->count
- 3;
281 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
284 struct acpi_device
*device
= cooling_dev
->devdata
;
285 struct acpi_video_device
*video
= acpi_driver_data(device
);
286 unsigned long long level
;
289 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
291 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
292 if (level
== video
->brightness
->levels
[offset
]) {
293 *state
= video
->brightness
->count
- offset
- 1;
301 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
303 struct acpi_device
*device
= cooling_dev
->devdata
;
304 struct acpi_video_device
*video
= acpi_driver_data(device
);
307 if (state
>= video
->brightness
->count
- 2)
310 state
= video
->brightness
->count
- state
;
311 level
= video
->brightness
->levels
[state
- 1];
312 return acpi_video_device_lcd_set_level(video
, level
);
315 static const struct thermal_cooling_device_ops video_cooling_ops
= {
316 .get_max_state
= video_get_max_state
,
317 .get_cur_state
= video_get_cur_state
,
318 .set_cur_state
= video_set_cur_state
,
322 * --------------------------------------------------------------------------
324 * --------------------------------------------------------------------------
328 acpi_video_device_lcd_query_levels(struct acpi_video_device
*device
,
329 union acpi_object
**levels
)
332 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
333 union acpi_object
*obj
;
338 status
= acpi_evaluate_object(device
->dev
->handle
, "_BCL", NULL
, &buffer
);
339 if (!ACPI_SUCCESS(status
))
341 obj
= (union acpi_object
*)buffer
.pointer
;
342 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
343 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
353 kfree(buffer
.pointer
);
359 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
364 status
= acpi_execute_simple_method(device
->dev
->handle
,
366 if (ACPI_FAILURE(status
)) {
367 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
371 device
->brightness
->curr
= level
;
372 for (state
= 2; state
< device
->brightness
->count
; state
++)
373 if (level
== device
->brightness
->levels
[state
]) {
374 if (device
->backlight
)
375 device
->backlight
->props
.brightness
= state
- 2;
379 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
388 static int bqc_offset_aml_bug_workaround
;
389 static int video_set_bqc_offset(const struct dmi_system_id
*d
)
391 bqc_offset_aml_bug_workaround
= 9;
395 static int video_disable_backlight_sysfs_if(
396 const struct dmi_system_id
*d
)
398 if (disable_backlight_sysfs_if
== -1)
399 disable_backlight_sysfs_if
= 1;
403 static int video_set_device_id_scheme(const struct dmi_system_id
*d
)
405 device_id_scheme
= true;
409 static int video_enable_only_lcd(const struct dmi_system_id
*d
)
415 static int video_set_report_key_events(const struct dmi_system_id
*id
)
417 if (report_key_events
== -1)
418 report_key_events
= (uintptr_t)id
->driver_data
;
422 static struct dmi_system_id video_dmi_table
[] = {
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
427 .callback
= video_set_bqc_offset
,
428 .ident
= "Acer Aspire 5720",
430 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
435 .callback
= video_set_bqc_offset
,
436 .ident
= "Acer Aspire 5710Z",
438 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
443 .callback
= video_set_bqc_offset
,
444 .ident
= "eMachines E510",
446 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
451 .callback
= video_set_bqc_offset
,
452 .ident
= "Acer Aspire 5315",
454 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
459 .callback
= video_set_bqc_offset
,
460 .ident
= "Acer Aspire 7720",
462 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback
= video_disable_backlight_sysfs_if
,
477 .ident
= "Toshiba Portege R700",
479 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R700"),
484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback
= video_disable_backlight_sysfs_if
,
486 .ident
= "Toshiba Portege R830",
488 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R830"),
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback
= video_disable_backlight_sysfs_if
,
495 .ident
= "Toshiba Satellite R830",
497 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME
, "SATELLITE R830"),
502 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
503 * but the IDs actually follow the Device ID Scheme.
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback
= video_set_device_id_scheme
,
508 .ident
= "ESPRIMO Mobile M9410",
510 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
515 * Some machines have multiple video output devices, but only the one
516 * that is the type of LCD can do the backlight control so we should not
517 * register backlight interface for other video output devices.
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
521 .callback
= video_enable_only_lcd
,
522 .ident
= "ESPRIMO Mobile M9410",
524 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
525 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
529 * Some machines report wrong key events on the acpi-bus, suppress
530 * key event reporting on these. Note this is only intended to work
531 * around events which are plain wrong. In some cases we get double
532 * events, in this case acpi-video is considered the canonical source
533 * and the events from the other source should be filtered. E.g.
534 * by calling acpi_video_handles_brightness_key_presses() from the
535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
538 .callback
= video_set_report_key_events
,
539 .driver_data
= (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS
),
540 .ident
= "Dell Vostro V131",
542 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
543 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro V131"),
549 static unsigned long long
550 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
551 unsigned long long bqc_value
)
553 unsigned long long level
;
555 if (device
->brightness
->flags
._BQC_use_index
) {
557 * _BQC returns an index that doesn't account for
558 * the first 2 items with special meaning, so we need
559 * to compensate for that by offsetting ourselves
561 if (device
->brightness
->flags
._BCL_reversed
)
562 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
564 level
= device
->brightness
->levels
[bqc_value
+ 2];
569 level
+= bqc_offset_aml_bug_workaround
;
575 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
576 unsigned long long *level
, bool raw
)
578 acpi_status status
= AE_OK
;
581 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
582 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
584 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
586 if (ACPI_SUCCESS(status
)) {
589 * Caller has indicated he wants the raw
590 * value returned by _BQC, so don't furtherly
591 * mess with the value.
596 *level
= acpi_video_bqc_value_to_level(device
, *level
);
598 for (i
= 2; i
< device
->brightness
->count
; i
++)
599 if (device
->brightness
->levels
[i
] == *level
) {
600 device
->brightness
->curr
= *level
;
604 * BQC returned an invalid level.
607 ACPI_WARNING((AE_INFO
,
608 "%s returned an invalid level",
610 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
614 * should we return an error or ignore this failure?
615 * dev->brightness->curr is a cached value which stores
616 * the correct current backlight level in most cases.
617 * ACPI video backlight still works w/ buggy _BQC.
618 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
620 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
621 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
625 *level
= device
->brightness
->curr
;
630 acpi_video_device_EDID(struct acpi_video_device
*device
,
631 union acpi_object
**edid
, ssize_t length
)
634 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
635 union acpi_object
*obj
;
636 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
637 struct acpi_object_list args
= { 1, &arg0
};
645 arg0
.integer
.value
= 1;
646 else if (length
== 256)
647 arg0
.integer
.value
= 2;
651 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
652 if (ACPI_FAILURE(status
))
655 obj
= buffer
.pointer
;
657 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
660 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
672 * video : video bus device pointer
674 * 0. The system BIOS should NOT automatically switch(toggle)
675 * the active display output.
676 * 1. The system BIOS should automatically switch (toggle) the
677 * active display output. No switch event.
678 * 2. The _DGS value should be locked.
679 * 3. The system BIOS should not automatically switch (toggle) the
680 * active display output, but instead generate the display switch
683 * 0. The system BIOS should automatically control the brightness level
684 * of the LCD when the power changes from AC to DC
685 * 1. The system BIOS should NOT automatically control the brightness
686 * level of the LCD when the power changes from AC to DC.
692 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
696 if (!video
->cap
._DOS
)
699 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
701 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
702 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
703 (lcd_flag
<< 2) | bios_flag
);
704 if (ACPI_FAILURE(status
))
711 * Simple comparison function used to sort backlight levels.
715 acpi_video_cmp_level(const void *a
, const void *b
)
717 return *(int *)a
- *(int *)b
;
721 * Decides if _BQC/_BCQ for this system is usable
723 * We do this by changing the level first and then read out the current
724 * brightness level, if the value does not match, find out if it is using
725 * index. If not, clear the _BQC/_BCQ capability.
727 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
728 int max_level
, int current_level
)
730 struct acpi_video_device_brightness
*br
= device
->brightness
;
732 unsigned long long level
;
735 /* don't mess with existing known broken systems */
736 if (bqc_offset_aml_bug_workaround
)
740 * Some systems always report current brightness level as maximum
741 * through _BQC, we need to test another value for them.
743 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
745 result
= acpi_video_device_lcd_set_level(device
, test_level
);
749 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
753 if (level
!= test_level
) {
754 /* buggy _BQC found, need to find out if it uses index */
755 if (level
< br
->count
) {
756 if (br
->flags
._BCL_reversed
)
757 level
= br
->count
- 3 - level
;
758 if (br
->levels
[level
+ 2] == test_level
)
759 br
->flags
._BQC_use_index
= 1;
762 if (!br
->flags
._BQC_use_index
)
763 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
772 * device : video output device (LCD, CRT, ..)
775 * Maximum brightness level
777 * Allocate and initialize device->brightness.
781 acpi_video_init_brightness(struct acpi_video_device
*device
)
783 union acpi_object
*obj
= NULL
;
784 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
785 unsigned long long level
, level_old
;
786 union acpi_object
*o
;
787 struct acpi_video_device_brightness
*br
= NULL
;
788 int result
= -EINVAL
;
791 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
, &obj
))) {
792 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
793 "LCD brightness level\n"));
797 if (obj
->package
.count
< 2)
800 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
802 printk(KERN_ERR
"can't allocate memory\n");
807 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
814 for (i
= 0; i
< obj
->package
.count
; i
++) {
815 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
816 if (o
->type
!= ACPI_TYPE_INTEGER
) {
817 printk(KERN_ERR PREFIX
"Invalid data\n");
820 value
= (u32
) o
->integer
.value
;
821 /* Skip duplicate entries */
822 if (count
> 2 && br
->levels
[count
- 1] == value
)
825 br
->levels
[count
] = value
;
827 if (br
->levels
[count
] > max_level
)
828 max_level
= br
->levels
[count
];
833 * some buggy BIOS don't export the levels
834 * when machine is on AC/Battery in _BCL package.
835 * In this case, the first two elements in _BCL packages
836 * are also supported brightness levels that OS should take care of.
838 for (i
= 2; i
< count
; i
++) {
839 if (br
->levels
[i
] == br
->levels
[0])
841 if (br
->levels
[i
] == br
->levels
[1])
845 if (level_ac_battery
< 2) {
846 level_ac_battery
= 2 - level_ac_battery
;
847 br
->flags
._BCL_no_ac_battery_levels
= 1;
848 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
849 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
850 count
+= level_ac_battery
;
851 } else if (level_ac_battery
> 2)
852 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
854 /* Check if the _BCL package is in a reversed order */
855 if (max_level
== br
->levels
[2]) {
856 br
->flags
._BCL_reversed
= 1;
857 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
858 acpi_video_cmp_level
, NULL
);
859 } else if (max_level
!= br
->levels
[count
- 1])
861 "Found unordered _BCL package"));
864 device
->brightness
= br
;
866 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
867 br
->curr
= level
= max_level
;
869 if (!device
->cap
._BQC
)
872 result
= acpi_video_device_lcd_get_level_current(device
,
875 goto out_free_levels
;
877 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
879 goto out_free_levels
;
881 * cap._BQC may get cleared due to _BQC is found to be broken
882 * in acpi_video_bqc_quirk, so check again here.
884 if (!device
->cap
._BQC
)
887 level
= acpi_video_bqc_value_to_level(device
, level_old
);
889 * On some buggy laptops, _BQC returns an uninitialized
890 * value when invoked for the first time, i.e.
891 * level_old is invalid (no matter whether it's a level
892 * or an index). Set the backlight to max_level in this case.
894 for (i
= 2; i
< br
->count
; i
++)
895 if (level
== br
->levels
[i
])
897 if (i
== br
->count
|| !level
)
901 result
= acpi_video_device_lcd_set_level(device
, level
);
903 goto out_free_levels
;
905 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
906 "found %d brightness levels\n", count
- 2));
915 device
->brightness
= NULL
;
922 * device : video output device (LCD, CRT, ..)
927 * Find out all required AML methods defined under the output
931 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
933 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
934 device
->cap
._ADR
= 1;
935 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
936 device
->cap
._BCL
= 1;
937 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
938 device
->cap
._BCM
= 1;
939 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
940 device
->cap
._BQC
= 1;
941 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
942 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
943 device
->cap
._BCQ
= 1;
946 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
947 device
->cap
._DDC
= 1;
952 * device : video output device (VGA)
957 * Find out all required AML methods defined under the video bus device.
960 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
962 if (acpi_has_method(video
->device
->handle
, "_DOS"))
964 if (acpi_has_method(video
->device
->handle
, "_DOD"))
966 if (acpi_has_method(video
->device
->handle
, "_ROM"))
968 if (acpi_has_method(video
->device
->handle
, "_GPD"))
970 if (acpi_has_method(video
->device
->handle
, "_SPD"))
972 if (acpi_has_method(video
->device
->handle
, "_VPO"))
977 * Check whether the video bus device has required AML method to
978 * support the desired features
981 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
983 acpi_status status
= -ENOENT
;
989 dev
= acpi_get_pci_dev(video
->device
->handle
);
995 * Since there is no HID, CID and so on for VGA driver, we have
996 * to check well known required nodes.
999 /* Does this device support video switching? */
1000 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1001 if (!video
->cap
._DOS
) {
1002 printk(KERN_WARNING FW_BUG
1003 "ACPI(%s) defines _DOD but not _DOS\n",
1004 acpi_device_bid(video
->device
));
1006 video
->flags
.multihead
= 1;
1010 /* Does this device support retrieving a video ROM? */
1011 if (video
->cap
._ROM
) {
1012 video
->flags
.rom
= 1;
1016 /* Does this device support configuring which video device to POST? */
1017 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1018 video
->flags
.post
= 1;
1026 * --------------------------------------------------------------------------
1028 * --------------------------------------------------------------------------
1031 /* device interface */
1032 static struct acpi_video_device_attrib
*
1033 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1035 struct acpi_video_enumerated_device
*ids
;
1038 for (i
= 0; i
< video
->attached_count
; i
++) {
1039 ids
= &video
->attached_array
[i
];
1040 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1041 return &ids
->value
.attrib
;
1048 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1049 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
.int_val
;
1064 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1065 struct acpi_video_bus
*video
)
1067 unsigned long long device_id
;
1068 int status
, device_type
;
1069 struct acpi_video_device
*data
;
1070 struct acpi_video_device_attrib
*attribute
;
1073 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1074 /* Some device omits _ADR, we skip them instead of fail */
1075 if (ACPI_FAILURE(status
))
1078 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1082 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1083 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1084 device
->driver_data
= data
;
1086 data
->device_id
= device_id
;
1087 data
->video
= video
;
1089 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1090 acpi_video_switch_brightness
);
1092 attribute
= acpi_video_get_device_attr(video
, device_id
);
1094 if (attribute
&& (attribute
->device_id_scheme
|| device_id_scheme
)) {
1095 switch (attribute
->display_type
) {
1096 case ACPI_VIDEO_DISPLAY_CRT
:
1097 data
->flags
.crt
= 1;
1099 case ACPI_VIDEO_DISPLAY_TV
:
1100 data
->flags
.tvout
= 1;
1102 case ACPI_VIDEO_DISPLAY_DVI
:
1103 data
->flags
.dvi
= 1;
1105 case ACPI_VIDEO_DISPLAY_LCD
:
1106 data
->flags
.lcd
= 1;
1109 data
->flags
.unknown
= 1;
1112 if (attribute
->bios_can_detect
)
1113 data
->flags
.bios
= 1;
1115 /* Check for legacy IDs */
1116 device_type
= acpi_video_get_device_type(video
, device_id
);
1117 /* Ignore bits 16 and 18-20 */
1118 switch (device_type
& 0xffe2ffff) {
1119 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1120 data
->flags
.crt
= 1;
1122 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1123 data
->flags
.lcd
= 1;
1125 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1126 data
->flags
.tvout
= 1;
1129 data
->flags
.unknown
= 1;
1133 acpi_video_device_bind(video
, data
);
1134 acpi_video_device_find_cap(data
);
1136 mutex_lock(&video
->device_list_lock
);
1137 list_add_tail(&data
->entry
, &video
->video_device_list
);
1138 mutex_unlock(&video
->device_list_lock
);
1145 * video : video bus device
1150 * Enumerate the video device list of the video bus,
1151 * bind the ids with the corresponding video devices
1152 * under the video bus.
1155 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1157 struct acpi_video_device
*dev
;
1159 mutex_lock(&video
->device_list_lock
);
1161 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1162 acpi_video_device_bind(video
, dev
);
1164 mutex_unlock(&video
->device_list_lock
);
1169 * video : video bus device
1170 * device : video output device under the video
1176 * Bind the ids with the corresponding video devices
1177 * under the video bus.
1181 acpi_video_device_bind(struct acpi_video_bus
*video
,
1182 struct acpi_video_device
*device
)
1184 struct acpi_video_enumerated_device
*ids
;
1187 for (i
= 0; i
< video
->attached_count
; i
++) {
1188 ids
= &video
->attached_array
[i
];
1189 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1190 ids
->bind_info
= device
;
1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1196 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1198 struct acpi_video_bus
*video
= device
->video
;
1202 * If we have a broken _DOD or we have more than 8 output devices
1203 * under the graphics controller node that we can't proper deal with
1204 * in the operation region code currently, no need to test.
1206 if (!video
->attached_count
|| video
->child_count
> 8)
1209 for (i
= 0; i
< video
->attached_count
; i
++) {
1210 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1211 (device
->device_id
& 0xfff))
1220 * video : video bus device
1225 * Call _DOD to enumerate all devices attached to display adapter
1229 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1234 struct acpi_video_enumerated_device
*active_list
;
1235 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1236 union acpi_object
*dod
= NULL
;
1237 union acpi_object
*obj
;
1239 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1240 if (!ACPI_SUCCESS(status
)) {
1241 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1245 dod
= buffer
.pointer
;
1246 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1247 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1252 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1253 dod
->package
.count
));
1255 active_list
= kcalloc(1 + dod
->package
.count
,
1256 sizeof(struct acpi_video_enumerated_device
),
1264 for (i
= 0; i
< dod
->package
.count
; i
++) {
1265 obj
= &dod
->package
.elements
[i
];
1267 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1268 printk(KERN_ERR PREFIX
1269 "Invalid _DOD data in element %d\n", i
);
1273 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1274 active_list
[count
].bind_info
= NULL
;
1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1276 (int)obj
->integer
.value
));
1280 kfree(video
->attached_array
);
1282 video
->attached_array
= active_list
;
1283 video
->attached_count
= count
;
1286 kfree(buffer
.pointer
);
1291 acpi_video_get_next_level(struct acpi_video_device
*device
,
1292 u32 level_current
, u32 event
)
1294 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1295 max
= max_below
= 0;
1296 min
= min_above
= 255;
1297 /* Find closest level to level_current */
1298 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1299 l
= device
->brightness
->levels
[i
];
1300 if (abs(l
- level_current
) < abs(delta
)) {
1301 delta
= l
- level_current
;
1306 /* Ajust level_current to closest available level */
1307 level_current
+= delta
;
1308 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1309 l
= device
->brightness
->levels
[i
];
1314 if (l
< min_above
&& l
> level_current
)
1316 if (l
> max_below
&& l
< level_current
)
1321 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1322 return (level_current
< max
) ? min_above
: min
;
1323 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1324 return (level_current
< max
) ? min_above
: max
;
1325 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1326 return (level_current
> min
) ? max_below
: min
;
1327 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1328 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1331 return level_current
;
1336 acpi_video_switch_brightness(struct work_struct
*work
)
1338 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1339 struct acpi_video_device
, switch_brightness_work
);
1340 unsigned long long level_current
, level_next
;
1341 int event
= device
->switch_brightness_event
;
1342 int result
= -EINVAL
;
1344 /* no warning message if acpi_backlight=vendor or a quirk is used */
1345 if (!device
->backlight
)
1348 if (!device
->brightness
)
1351 result
= acpi_video_device_lcd_get_level_current(device
,
1357 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1359 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1362 backlight_force_update(device
->backlight
,
1363 BACKLIGHT_UPDATE_HOTKEY
);
1367 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1370 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1373 struct acpi_video_bus
*video
;
1374 struct acpi_video_device
*video_device
;
1375 union acpi_object
*buffer
= NULL
;
1379 if (!device
|| !acpi_driver_data(device
))
1382 video
= acpi_driver_data(device
);
1384 for (i
= 0; i
< video
->attached_count
; i
++) {
1385 video_device
= video
->attached_array
[i
].bind_info
;
1391 if (!video_device
->cap
._DDC
)
1396 case ACPI_VIDEO_DISPLAY_CRT
:
1397 if (!video_device
->flags
.crt
)
1400 case ACPI_VIDEO_DISPLAY_TV
:
1401 if (!video_device
->flags
.tvout
)
1404 case ACPI_VIDEO_DISPLAY_DVI
:
1405 if (!video_device
->flags
.dvi
)
1408 case ACPI_VIDEO_DISPLAY_LCD
:
1409 if (!video_device
->flags
.lcd
)
1413 } else if (video_device
->device_id
!= device_id
) {
1417 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1419 if (ACPI_FAILURE(status
) || !buffer
||
1420 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1422 status
= acpi_video_device_EDID(video_device
, &buffer
,
1424 if (ACPI_FAILURE(status
) || !buffer
||
1425 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1430 *edid
= buffer
->buffer
.pointer
;
1436 EXPORT_SYMBOL(acpi_video_get_edid
);
1439 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1440 struct acpi_device
*device
)
1443 struct acpi_device
*dev
;
1446 * There are systems where video module known to work fine regardless
1447 * of broken _DOD and ignoring returned value here doesn't cause
1450 acpi_video_device_enumerate(video
);
1452 list_for_each_entry(dev
, &device
->children
, node
) {
1454 status
= acpi_video_bus_get_one_device(dev
, video
);
1456 dev_err(&dev
->dev
, "Can't attach device\n");
1459 video
->child_count
++;
1464 /* acpi_video interface */
1467 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1468 * preform any automatic brightness change on receiving a notification.
1470 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1472 return acpi_video_bus_DOS(video
, 0,
1473 acpi_osi_is_win8() ? 1 : 0);
1476 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1478 return acpi_video_bus_DOS(video
, 0,
1479 acpi_osi_is_win8() ? 0 : 1);
1482 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1484 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1485 struct input_dev
*input
;
1488 if (!video
|| !video
->input
)
1491 input
= video
->input
;
1494 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1495 * most likely via hotkey. */
1496 keycode
= KEY_SWITCHVIDEOMODE
;
1499 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1501 acpi_video_device_enumerate(video
);
1502 acpi_video_device_rebind(video
);
1503 keycode
= KEY_SWITCHVIDEOMODE
;
1506 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1507 keycode
= KEY_SWITCHVIDEOMODE
;
1509 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1510 keycode
= KEY_VIDEO_NEXT
;
1512 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1513 keycode
= KEY_VIDEO_PREV
;
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1518 "Unsupported event [0x%x]\n", event
));
1522 if (acpi_notifier_call_chain(device
, event
, 0))
1523 /* Something vetoed the keypress. */
1526 if (keycode
&& (report_key_events
& REPORT_OUTPUT_KEY_EVENTS
)) {
1527 input_report_key(input
, keycode
, 1);
1529 input_report_key(input
, keycode
, 0);
1536 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1539 if (!brightness_switch_enabled
)
1542 video_device
->switch_brightness_event
= event
;
1543 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1546 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1548 struct acpi_video_device
*video_device
= data
;
1549 struct acpi_device
*device
= NULL
;
1550 struct acpi_video_bus
*bus
;
1551 struct input_dev
*input
;
1557 device
= video_device
->dev
;
1558 bus
= video_device
->video
;
1562 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1563 brightness_switch_event(video_device
, event
);
1564 keycode
= KEY_BRIGHTNESS_CYCLE
;
1566 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1567 brightness_switch_event(video_device
, event
);
1568 keycode
= KEY_BRIGHTNESSUP
;
1570 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1571 brightness_switch_event(video_device
, event
);
1572 keycode
= KEY_BRIGHTNESSDOWN
;
1574 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1575 brightness_switch_event(video_device
, event
);
1576 keycode
= KEY_BRIGHTNESS_ZERO
;
1578 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1579 brightness_switch_event(video_device
, event
);
1580 keycode
= KEY_DISPLAY_OFF
;
1583 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1584 "Unsupported event [0x%x]\n", event
));
1588 acpi_notifier_call_chain(device
, event
, 0);
1590 if (keycode
&& (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
)) {
1591 input_report_key(input
, keycode
, 1);
1593 input_report_key(input
, keycode
, 0);
1600 static int acpi_video_resume(struct notifier_block
*nb
,
1601 unsigned long val
, void *ign
)
1603 struct acpi_video_bus
*video
;
1604 struct acpi_video_device
*video_device
;
1608 case PM_HIBERNATION_PREPARE
:
1609 case PM_SUSPEND_PREPARE
:
1610 case PM_RESTORE_PREPARE
:
1614 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1616 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1618 for (i
= 0; i
< video
->attached_count
; i
++) {
1619 video_device
= video
->attached_array
[i
].bind_info
;
1620 if (video_device
&& video_device
->brightness
)
1621 acpi_video_device_lcd_set_level(video_device
,
1622 video_device
->brightness
->curr
);
1629 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1630 void **return_value
)
1632 struct acpi_device
*device
= context
;
1633 struct acpi_device
*sibling
;
1636 if (handle
== device
->handle
)
1637 return AE_CTRL_TERMINATE
;
1639 result
= acpi_bus_get_device(handle
, &sibling
);
1643 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1644 return AE_ALREADY_EXISTS
;
1649 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1651 struct backlight_properties props
;
1652 struct pci_dev
*pdev
;
1653 acpi_handle acpi_parent
;
1654 struct device
*parent
= NULL
;
1659 result
= acpi_video_init_brightness(device
);
1663 if (disable_backlight_sysfs_if
> 0)
1666 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1671 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1673 pdev
= acpi_get_pci_dev(acpi_parent
);
1675 parent
= &pdev
->dev
;
1679 memset(&props
, 0, sizeof(struct backlight_properties
));
1680 props
.type
= BACKLIGHT_FIRMWARE
;
1681 props
.max_brightness
= device
->brightness
->count
- 3;
1682 device
->backlight
= backlight_device_register(name
,
1685 &acpi_backlight_ops
,
1688 if (IS_ERR(device
->backlight
)) {
1689 device
->backlight
= NULL
;
1694 * Save current brightness level in case we have to restore it
1695 * before acpi_video_device_lcd_set_level() is called next time.
1697 device
->backlight
->props
.brightness
=
1698 acpi_video_get_brightness(device
->backlight
);
1700 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1701 device
->dev
, &video_cooling_ops
);
1702 if (IS_ERR(device
->cooling_dev
)) {
1704 * Set cooling_dev to NULL so we don't crash trying to free it.
1705 * Also, why the hell we are returning early and not attempt to
1706 * register video output if cooling device registration failed?
1709 device
->cooling_dev
= NULL
;
1713 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1714 device
->cooling_dev
->id
);
1715 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1716 &device
->cooling_dev
->device
.kobj
,
1719 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1720 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1721 &device
->dev
->dev
.kobj
, "device");
1723 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1726 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1728 struct acpi_video_device
*dev
;
1729 union acpi_object
*levels
;
1731 mutex_lock(&video
->device_list_lock
);
1732 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1733 if (!acpi_video_device_lcd_query_levels(dev
, &levels
))
1736 mutex_unlock(&video
->device_list_lock
);
1739 static bool acpi_video_should_register_backlight(struct acpi_video_device
*dev
)
1742 * Do not create backlight device for video output
1743 * device that is not in the enumerated list.
1745 if (!acpi_video_device_in_dod(dev
)) {
1746 dev_dbg(&dev
->dev
->dev
, "not in _DOD list, ignore\n");
1751 return dev
->flags
.lcd
;
1755 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1757 struct acpi_video_device
*dev
;
1759 if (video
->backlight_registered
)
1762 acpi_video_run_bcl_for_osi(video
);
1764 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1767 mutex_lock(&video
->device_list_lock
);
1768 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1769 if (acpi_video_should_register_backlight(dev
))
1770 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_bus_put_devices(struct acpi_video_bus
*video
)
1912 struct acpi_video_device
*dev
, *next
;
1914 mutex_lock(&video
->device_list_lock
);
1915 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1916 list_del(&dev
->entry
);
1919 mutex_unlock(&video
->device_list_lock
);
1924 static int instance
;
1926 static int acpi_video_bus_add(struct acpi_device
*device
)
1928 struct acpi_video_bus
*video
;
1932 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1933 device
->parent
->handle
, 1,
1934 acpi_video_bus_match
, NULL
,
1936 if (status
== AE_ALREADY_EXISTS
) {
1937 printk(KERN_WARNING FW_BUG
1938 "Duplicate ACPI video bus devices for the"
1939 " same VGA controller, please try module "
1940 "parameter \"video.allow_duplicates=1\""
1941 "if the current driver doesn't work.\n");
1942 if (!allow_duplicates
)
1946 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1950 /* a hack to fix the duplicate name "VID" problem on T61 */
1951 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1953 device
->pnp
.bus_id
[3] = '0' + instance
;
1956 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1957 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1959 device
->pnp
.bus_id
[3] = '0' + instance
;
1963 video
->device
= device
;
1964 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1965 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1966 device
->driver_data
= video
;
1968 acpi_video_bus_find_cap(video
);
1969 error
= acpi_video_bus_check(video
);
1971 goto err_free_video
;
1973 mutex_init(&video
->device_list_lock
);
1974 INIT_LIST_HEAD(&video
->video_device_list
);
1976 error
= acpi_video_bus_get_devices(video
, device
);
1980 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1981 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1982 video
->flags
.multihead
? "yes" : "no",
1983 video
->flags
.rom
? "yes" : "no",
1984 video
->flags
.post
? "yes" : "no");
1985 mutex_lock(&video_list_lock
);
1986 list_add_tail(&video
->entry
, &video_bus_head
);
1987 mutex_unlock(&video_list_lock
);
1989 acpi_video_bus_register_backlight(video
);
1990 acpi_video_bus_add_notify_handler(video
);
1995 acpi_video_bus_put_devices(video
);
1996 kfree(video
->attached_array
);
1999 device
->driver_data
= NULL
;
2004 static int acpi_video_bus_remove(struct acpi_device
*device
)
2006 struct acpi_video_bus
*video
= NULL
;
2009 if (!device
|| !acpi_driver_data(device
))
2012 video
= acpi_driver_data(device
);
2014 acpi_video_bus_remove_notify_handler(video
);
2015 acpi_video_bus_unregister_backlight(video
);
2016 acpi_video_bus_put_devices(video
);
2018 mutex_lock(&video_list_lock
);
2019 list_del(&video
->entry
);
2020 mutex_unlock(&video_list_lock
);
2022 kfree(video
->attached_array
);
2028 static int __init
is_i740(struct pci_dev
*dev
)
2030 if (dev
->device
== 0x00D1)
2032 if (dev
->device
== 0x7000)
2037 static int __init
intel_opregion_present(void)
2040 struct pci_dev
*dev
= NULL
;
2043 for_each_pci_dev(dev
) {
2044 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2046 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2048 /* We don't want to poke around undefined i740 registers */
2051 pci_read_config_dword(dev
, 0xfc, &address
);
2059 int acpi_video_register(void)
2063 mutex_lock(®ister_count_mutex
);
2064 if (register_count
) {
2066 * if the function of acpi_video_register is already called,
2067 * don't register the acpi_vide_bus again and return no error.
2072 dmi_check_system(video_dmi_table
);
2074 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2079 * When the acpi_video_bus is loaded successfully, increase
2080 * the counter reference.
2085 mutex_unlock(®ister_count_mutex
);
2088 EXPORT_SYMBOL(acpi_video_register
);
2090 void acpi_video_unregister(void)
2092 mutex_lock(®ister_count_mutex
);
2093 if (register_count
) {
2094 acpi_bus_unregister_driver(&acpi_video_bus
);
2097 mutex_unlock(®ister_count_mutex
);
2099 EXPORT_SYMBOL(acpi_video_unregister
);
2101 void acpi_video_unregister_backlight(void)
2103 struct acpi_video_bus
*video
;
2105 mutex_lock(®ister_count_mutex
);
2106 if (register_count
) {
2107 mutex_lock(&video_list_lock
);
2108 list_for_each_entry(video
, &video_bus_head
, entry
)
2109 acpi_video_bus_unregister_backlight(video
);
2110 mutex_unlock(&video_list_lock
);
2112 mutex_unlock(®ister_count_mutex
);
2115 bool acpi_video_handles_brightness_key_presses(void)
2117 bool have_video_busses
;
2119 mutex_lock(&video_list_lock
);
2120 have_video_busses
= !list_empty(&video_bus_head
);
2121 mutex_unlock(&video_list_lock
);
2123 return have_video_busses
&&
2124 (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
);
2126 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses
);
2129 * This is kind of nasty. Hardware using Intel chipsets may require
2130 * the video opregion code to be run first in order to initialise
2131 * state before any ACPI video calls are made. To handle this we defer
2132 * registration of the video class until the opregion code has run.
2135 static int __init
acpi_video_init(void)
2138 * Let the module load even if ACPI is disabled (e.g. due to
2139 * a broken BIOS) so that i915.ko can still be loaded on such
2140 * old systems without an AcpiOpRegion.
2142 * acpi_video_register() will report -ENODEV later as well due
2143 * to acpi_disabled when i915.ko tries to register itself afterwards.
2148 if (intel_opregion_present())
2151 return acpi_video_register();
2154 static void __exit
acpi_video_exit(void)
2156 acpi_video_detect_exit();
2157 acpi_video_unregister();
2162 module_init(acpi_video_init
);
2163 module_exit(acpi_video_exit
);