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_device
{
195 unsigned long device_id
;
196 struct acpi_video_device_flags flags
;
197 struct acpi_video_device_cap cap
;
198 struct list_head entry
;
199 struct delayed_work switch_brightness_work
;
200 int switch_brightness_event
;
201 struct acpi_video_bus
*video
;
202 struct acpi_device
*dev
;
203 struct acpi_video_device_brightness
*brightness
;
204 struct backlight_device
*backlight
;
205 struct thermal_cooling_device
*cooling_dev
;
208 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
209 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
210 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
211 struct acpi_video_device
*device
);
212 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
213 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
215 static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device
*device
,
217 unsigned long long *level
, bool raw
);
218 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
219 u32 level_current
, u32 event
);
220 static void acpi_video_switch_brightness(struct work_struct
*work
);
222 /* backlight device sysfs support */
223 static int acpi_video_get_brightness(struct backlight_device
*bd
)
225 unsigned long long cur_level
;
227 struct acpi_video_device
*vd
= bl_get_data(bd
);
229 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
231 for (i
= 2; i
< vd
->brightness
->count
; i
++) {
232 if (vd
->brightness
->levels
[i
] == cur_level
)
234 * The first two entries are special - see page 575
235 * of the ACPI spec 3.0
242 static int acpi_video_set_brightness(struct backlight_device
*bd
)
244 int request_level
= bd
->props
.brightness
+ 2;
245 struct acpi_video_device
*vd
= bl_get_data(bd
);
247 cancel_delayed_work(&vd
->switch_brightness_work
);
248 return acpi_video_device_lcd_set_level(vd
,
249 vd
->brightness
->levels
[request_level
]);
252 static const struct backlight_ops acpi_backlight_ops
= {
253 .get_brightness
= acpi_video_get_brightness
,
254 .update_status
= acpi_video_set_brightness
,
257 /* thermal cooling device callbacks */
258 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
, unsigned
261 struct acpi_device
*device
= cooling_dev
->devdata
;
262 struct acpi_video_device
*video
= acpi_driver_data(device
);
264 *state
= video
->brightness
->count
- 3;
268 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned
271 struct acpi_device
*device
= cooling_dev
->devdata
;
272 struct acpi_video_device
*video
= acpi_driver_data(device
);
273 unsigned long long level
;
276 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
278 for (offset
= 2; offset
< video
->brightness
->count
; offset
++)
279 if (level
== video
->brightness
->levels
[offset
]) {
280 *state
= video
->brightness
->count
- offset
- 1;
288 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
290 struct acpi_device
*device
= cooling_dev
->devdata
;
291 struct acpi_video_device
*video
= acpi_driver_data(device
);
294 if (state
>= video
->brightness
->count
- 2)
297 state
= video
->brightness
->count
- state
;
298 level
= video
->brightness
->levels
[state
- 1];
299 return acpi_video_device_lcd_set_level(video
, level
);
302 static const struct thermal_cooling_device_ops video_cooling_ops
= {
303 .get_max_state
= video_get_max_state
,
304 .get_cur_state
= video_get_cur_state
,
305 .set_cur_state
= video_set_cur_state
,
309 * --------------------------------------------------------------------------
311 * --------------------------------------------------------------------------
315 acpi_video_device_lcd_query_levels(acpi_handle handle
,
316 union acpi_object
**levels
)
319 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
320 union acpi_object
*obj
;
325 status
= acpi_evaluate_object(handle
, "_BCL", NULL
, &buffer
);
326 if (!ACPI_SUCCESS(status
))
328 obj
= (union acpi_object
*)buffer
.pointer
;
329 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
330 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
340 kfree(buffer
.pointer
);
346 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
351 status
= acpi_execute_simple_method(device
->dev
->handle
,
353 if (ACPI_FAILURE(status
)) {
354 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
358 device
->brightness
->curr
= level
;
359 for (state
= 2; state
< device
->brightness
->count
; state
++)
360 if (level
== device
->brightness
->levels
[state
]) {
361 if (device
->backlight
)
362 device
->backlight
->props
.brightness
= state
- 2;
366 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
371 * For some buggy _BQC methods, we need to add a constant value to
372 * the _BQC return value to get the actual current brightness level
375 static int bqc_offset_aml_bug_workaround
;
376 static int video_set_bqc_offset(const struct dmi_system_id
*d
)
378 bqc_offset_aml_bug_workaround
= 9;
382 static int video_disable_backlight_sysfs_if(
383 const struct dmi_system_id
*d
)
385 if (disable_backlight_sysfs_if
== -1)
386 disable_backlight_sysfs_if
= 1;
390 static int video_set_device_id_scheme(const struct dmi_system_id
*d
)
392 device_id_scheme
= true;
396 static int video_enable_only_lcd(const struct dmi_system_id
*d
)
402 static int video_set_report_key_events(const struct dmi_system_id
*id
)
404 if (report_key_events
== -1)
405 report_key_events
= (uintptr_t)id
->driver_data
;
409 static struct dmi_system_id video_dmi_table
[] = {
411 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
414 .callback
= video_set_bqc_offset
,
415 .ident
= "Acer Aspire 5720",
417 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
422 .callback
= video_set_bqc_offset
,
423 .ident
= "Acer Aspire 5710Z",
425 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
426 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
430 .callback
= video_set_bqc_offset
,
431 .ident
= "eMachines E510",
433 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
434 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
438 .callback
= video_set_bqc_offset
,
439 .ident
= "Acer Aspire 5315",
441 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
446 .callback
= video_set_bqc_offset
,
447 .ident
= "Acer Aspire 7720",
449 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
450 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
455 * Some machines have a broken acpi-video interface for brightness
456 * control, but still need an acpi_video_device_lcd_set_level() call
457 * on resume to turn the backlight power on. We Enable backlight
458 * control on these systems, but do not register a backlight sysfs
459 * as brightness control does not work.
462 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
463 .callback
= video_disable_backlight_sysfs_if
,
464 .ident
= "Toshiba Portege R700",
466 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
467 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R700"),
471 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
472 .callback
= video_disable_backlight_sysfs_if
,
473 .ident
= "Toshiba Portege R830",
475 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
476 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R830"),
480 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
481 .callback
= video_disable_backlight_sysfs_if
,
482 .ident
= "Toshiba Satellite R830",
484 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
485 DMI_MATCH(DMI_PRODUCT_NAME
, "SATELLITE R830"),
489 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
490 * but the IDs actually follow the Device ID Scheme.
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
494 .callback
= video_set_device_id_scheme
,
495 .ident
= "ESPRIMO Mobile M9410",
497 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
498 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
502 * Some machines have multiple video output devices, but only the one
503 * that is the type of LCD can do the backlight control so we should not
504 * register backlight interface for other video output devices.
507 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
508 .callback
= video_enable_only_lcd
,
509 .ident
= "ESPRIMO Mobile M9410",
511 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
512 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
516 * Some machines report wrong key events on the acpi-bus, suppress
517 * key event reporting on these. Note this is only intended to work
518 * around events which are plain wrong. In some cases we get double
519 * events, in this case acpi-video is considered the canonical source
520 * and the events from the other source should be filtered. E.g.
521 * by calling acpi_video_handles_brightness_key_presses() from the
522 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
525 .callback
= video_set_report_key_events
,
526 .driver_data
= (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS
),
527 .ident
= "Dell Vostro V131",
529 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
530 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro V131"),
536 static unsigned long long
537 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
538 unsigned long long bqc_value
)
540 unsigned long long level
;
542 if (device
->brightness
->flags
._BQC_use_index
) {
544 * _BQC returns an index that doesn't account for
545 * the first 2 items with special meaning, so we need
546 * to compensate for that by offsetting ourselves
548 if (device
->brightness
->flags
._BCL_reversed
)
549 bqc_value
= device
->brightness
->count
- 3 - bqc_value
;
551 level
= device
->brightness
->levels
[bqc_value
+ 2];
556 level
+= bqc_offset_aml_bug_workaround
;
562 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
563 unsigned long long *level
, bool raw
)
565 acpi_status status
= AE_OK
;
568 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
569 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
571 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
573 if (ACPI_SUCCESS(status
)) {
576 * Caller has indicated he wants the raw
577 * value returned by _BQC, so don't furtherly
578 * mess with the value.
583 *level
= acpi_video_bqc_value_to_level(device
, *level
);
585 for (i
= 2; i
< device
->brightness
->count
; i
++)
586 if (device
->brightness
->levels
[i
] == *level
) {
587 device
->brightness
->curr
= *level
;
591 * BQC returned an invalid level.
594 ACPI_WARNING((AE_INFO
,
595 "%s returned an invalid level",
597 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
601 * should we return an error or ignore this failure?
602 * dev->brightness->curr is a cached value which stores
603 * the correct current backlight level in most cases.
604 * ACPI video backlight still works w/ buggy _BQC.
605 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
607 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
608 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
612 *level
= device
->brightness
->curr
;
617 acpi_video_device_EDID(struct acpi_video_device
*device
,
618 union acpi_object
**edid
, ssize_t length
)
621 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
622 union acpi_object
*obj
;
623 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
624 struct acpi_object_list args
= { 1, &arg0
};
632 arg0
.integer
.value
= 1;
633 else if (length
== 256)
634 arg0
.integer
.value
= 2;
638 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
639 if (ACPI_FAILURE(status
))
642 obj
= buffer
.pointer
;
644 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
647 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
659 * video : video bus device pointer
661 * 0. The system BIOS should NOT automatically switch(toggle)
662 * the active display output.
663 * 1. The system BIOS should automatically switch (toggle) the
664 * active display output. No switch event.
665 * 2. The _DGS value should be locked.
666 * 3. The system BIOS should not automatically switch (toggle) the
667 * active display output, but instead generate the display switch
670 * 0. The system BIOS should automatically control the brightness level
671 * of the LCD when the power changes from AC to DC
672 * 1. The system BIOS should NOT automatically control the brightness
673 * level of the LCD when the power changes from AC to DC.
679 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
683 if (!video
->cap
._DOS
)
686 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
688 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
689 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
690 (lcd_flag
<< 2) | bios_flag
);
691 if (ACPI_FAILURE(status
))
698 * Simple comparison function used to sort backlight levels.
702 acpi_video_cmp_level(const void *a
, const void *b
)
704 return *(int *)a
- *(int *)b
;
708 * Decides if _BQC/_BCQ for this system is usable
710 * We do this by changing the level first and then read out the current
711 * brightness level, if the value does not match, find out if it is using
712 * index. If not, clear the _BQC/_BCQ capability.
714 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
715 int max_level
, int current_level
)
717 struct acpi_video_device_brightness
*br
= device
->brightness
;
719 unsigned long long level
;
722 /* don't mess with existing known broken systems */
723 if (bqc_offset_aml_bug_workaround
)
727 * Some systems always report current brightness level as maximum
728 * through _BQC, we need to test another value for them.
730 test_level
= current_level
== max_level
? br
->levels
[3] : max_level
;
732 result
= acpi_video_device_lcd_set_level(device
, test_level
);
736 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
740 if (level
!= test_level
) {
741 /* buggy _BQC found, need to find out if it uses index */
742 if (level
< br
->count
) {
743 if (br
->flags
._BCL_reversed
)
744 level
= br
->count
- 3 - level
;
745 if (br
->levels
[level
+ 2] == test_level
)
746 br
->flags
._BQC_use_index
= 1;
749 if (!br
->flags
._BQC_use_index
)
750 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
756 int acpi_video_get_levels(struct acpi_device
*device
,
757 struct acpi_video_device_brightness
**dev_br
)
759 union acpi_object
*obj
= NULL
;
760 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
761 union acpi_object
*o
;
762 struct acpi_video_device_brightness
*br
= NULL
;
766 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
->handle
,
768 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
769 "LCD brightness level\n"));
774 if (obj
->package
.count
< 2) {
779 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
781 printk(KERN_ERR
"can't allocate memory\n");
786 br
->levels
= kmalloc((obj
->package
.count
+ 2) * sizeof *(br
->levels
),
793 for (i
= 0; i
< obj
->package
.count
; i
++) {
794 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
795 if (o
->type
!= ACPI_TYPE_INTEGER
) {
796 printk(KERN_ERR PREFIX
"Invalid data\n");
799 value
= (u32
) o
->integer
.value
;
800 /* Skip duplicate entries */
801 if (count
> 2 && br
->levels
[count
- 1] == value
)
804 br
->levels
[count
] = value
;
806 if (br
->levels
[count
] > max_level
)
807 max_level
= br
->levels
[count
];
812 * some buggy BIOS don't export the levels
813 * when machine is on AC/Battery in _BCL package.
814 * In this case, the first two elements in _BCL packages
815 * are also supported brightness levels that OS should take care of.
817 for (i
= 2; i
< count
; i
++) {
818 if (br
->levels
[i
] == br
->levels
[0])
820 if (br
->levels
[i
] == br
->levels
[1])
824 if (level_ac_battery
< 2) {
825 level_ac_battery
= 2 - level_ac_battery
;
826 br
->flags
._BCL_no_ac_battery_levels
= 1;
827 for (i
= (count
- 1 + level_ac_battery
); i
>= 2; i
--)
828 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
829 count
+= level_ac_battery
;
830 } else if (level_ac_battery
> 2)
831 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
833 /* Check if the _BCL package is in a reversed order */
834 if (max_level
== br
->levels
[2]) {
835 br
->flags
._BCL_reversed
= 1;
836 sort(&br
->levels
[2], count
- 2, sizeof(br
->levels
[2]),
837 acpi_video_cmp_level
, NULL
);
838 } else if (max_level
!= br
->levels
[count
- 1])
840 "Found unordered _BCL package"));
852 EXPORT_SYMBOL(acpi_video_get_levels
);
856 * device : video output device (LCD, CRT, ..)
859 * Maximum brightness level
861 * Allocate and initialize device->brightness.
865 acpi_video_init_brightness(struct acpi_video_device
*device
)
867 int i
, max_level
= 0;
868 unsigned long long level
, level_old
;
869 struct acpi_video_device_brightness
*br
= NULL
;
870 int result
= -EINVAL
;
872 result
= acpi_video_get_levels(device
->dev
, &br
);
875 device
->brightness
= br
;
877 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
878 br
->curr
= level
= max_level
;
880 if (!device
->cap
._BQC
)
883 result
= acpi_video_device_lcd_get_level_current(device
,
886 goto out_free_levels
;
888 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
890 goto out_free_levels
;
892 * cap._BQC may get cleared due to _BQC is found to be broken
893 * in acpi_video_bqc_quirk, so check again here.
895 if (!device
->cap
._BQC
)
898 level
= acpi_video_bqc_value_to_level(device
, level_old
);
900 * On some buggy laptops, _BQC returns an uninitialized
901 * value when invoked for the first time, i.e.
902 * level_old is invalid (no matter whether it's a level
903 * or an index). Set the backlight to max_level in this case.
905 for (i
= 2; i
< br
->count
; i
++)
906 if (level
== br
->levels
[i
])
908 if (i
== br
->count
|| !level
)
912 result
= acpi_video_device_lcd_set_level(device
, level
);
914 goto out_free_levels
;
916 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
917 "found %d brightness levels\n", br
->count
- 2));
923 device
->brightness
= NULL
;
929 * device : video output device (LCD, CRT, ..)
934 * Find out all required AML methods defined under the output
938 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
940 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
941 device
->cap
._ADR
= 1;
942 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
943 device
->cap
._BCL
= 1;
944 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
945 device
->cap
._BCM
= 1;
946 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
947 device
->cap
._BQC
= 1;
948 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
949 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
950 device
->cap
._BCQ
= 1;
953 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
954 device
->cap
._DDC
= 1;
959 * device : video output device (VGA)
964 * Find out all required AML methods defined under the video bus device.
967 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
969 if (acpi_has_method(video
->device
->handle
, "_DOS"))
971 if (acpi_has_method(video
->device
->handle
, "_DOD"))
973 if (acpi_has_method(video
->device
->handle
, "_ROM"))
975 if (acpi_has_method(video
->device
->handle
, "_GPD"))
977 if (acpi_has_method(video
->device
->handle
, "_SPD"))
979 if (acpi_has_method(video
->device
->handle
, "_VPO"))
984 * Check whether the video bus device has required AML method to
985 * support the desired features
988 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
990 acpi_status status
= -ENOENT
;
996 dev
= acpi_get_pci_dev(video
->device
->handle
);
1002 * Since there is no HID, CID and so on for VGA driver, we have
1003 * to check well known required nodes.
1006 /* Does this device support video switching? */
1007 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1008 if (!video
->cap
._DOS
) {
1009 printk(KERN_WARNING FW_BUG
1010 "ACPI(%s) defines _DOD but not _DOS\n",
1011 acpi_device_bid(video
->device
));
1013 video
->flags
.multihead
= 1;
1017 /* Does this device support retrieving a video ROM? */
1018 if (video
->cap
._ROM
) {
1019 video
->flags
.rom
= 1;
1023 /* Does this device support configuring which video device to POST? */
1024 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1025 video
->flags
.post
= 1;
1033 * --------------------------------------------------------------------------
1035 * --------------------------------------------------------------------------
1038 /* device interface */
1039 static struct acpi_video_device_attrib
*
1040 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1042 struct acpi_video_enumerated_device
*ids
;
1045 for (i
= 0; i
< video
->attached_count
; i
++) {
1046 ids
= &video
->attached_array
[i
];
1047 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1048 return &ids
->value
.attrib
;
1055 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1056 unsigned long device_id
)
1058 struct acpi_video_enumerated_device
*ids
;
1061 for (i
= 0; i
< video
->attached_count
; i
++) {
1062 ids
= &video
->attached_array
[i
];
1063 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1064 return ids
->value
.int_val
;
1071 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1072 struct acpi_video_bus
*video
)
1074 unsigned long long device_id
;
1075 int status
, device_type
;
1076 struct acpi_video_device
*data
;
1077 struct acpi_video_device_attrib
*attribute
;
1080 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1081 /* Some device omits _ADR, we skip them instead of fail */
1082 if (ACPI_FAILURE(status
))
1085 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1089 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1090 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1091 device
->driver_data
= data
;
1093 data
->device_id
= device_id
;
1094 data
->video
= video
;
1096 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1097 acpi_video_switch_brightness
);
1099 attribute
= acpi_video_get_device_attr(video
, device_id
);
1101 if (attribute
&& (attribute
->device_id_scheme
|| device_id_scheme
)) {
1102 switch (attribute
->display_type
) {
1103 case ACPI_VIDEO_DISPLAY_CRT
:
1104 data
->flags
.crt
= 1;
1106 case ACPI_VIDEO_DISPLAY_TV
:
1107 data
->flags
.tvout
= 1;
1109 case ACPI_VIDEO_DISPLAY_DVI
:
1110 data
->flags
.dvi
= 1;
1112 case ACPI_VIDEO_DISPLAY_LCD
:
1113 data
->flags
.lcd
= 1;
1116 data
->flags
.unknown
= 1;
1119 if (attribute
->bios_can_detect
)
1120 data
->flags
.bios
= 1;
1122 /* Check for legacy IDs */
1123 device_type
= acpi_video_get_device_type(video
, device_id
);
1124 /* Ignore bits 16 and 18-20 */
1125 switch (device_type
& 0xffe2ffff) {
1126 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1127 data
->flags
.crt
= 1;
1129 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1130 data
->flags
.lcd
= 1;
1132 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1133 data
->flags
.tvout
= 1;
1136 data
->flags
.unknown
= 1;
1140 acpi_video_device_bind(video
, data
);
1141 acpi_video_device_find_cap(data
);
1143 mutex_lock(&video
->device_list_lock
);
1144 list_add_tail(&data
->entry
, &video
->video_device_list
);
1145 mutex_unlock(&video
->device_list_lock
);
1152 * video : video bus device
1157 * Enumerate the video device list of the video bus,
1158 * bind the ids with the corresponding video devices
1159 * under the video bus.
1162 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1164 struct acpi_video_device
*dev
;
1166 mutex_lock(&video
->device_list_lock
);
1168 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1169 acpi_video_device_bind(video
, dev
);
1171 mutex_unlock(&video
->device_list_lock
);
1176 * video : video bus device
1177 * device : video output device under the video
1183 * Bind the ids with the corresponding video devices
1184 * under the video bus.
1188 acpi_video_device_bind(struct acpi_video_bus
*video
,
1189 struct acpi_video_device
*device
)
1191 struct acpi_video_enumerated_device
*ids
;
1194 for (i
= 0; i
< video
->attached_count
; i
++) {
1195 ids
= &video
->attached_array
[i
];
1196 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1197 ids
->bind_info
= device
;
1198 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1203 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1205 struct acpi_video_bus
*video
= device
->video
;
1209 * If we have a broken _DOD or we have more than 8 output devices
1210 * under the graphics controller node that we can't proper deal with
1211 * in the operation region code currently, no need to test.
1213 if (!video
->attached_count
|| video
->child_count
> 8)
1216 for (i
= 0; i
< video
->attached_count
; i
++) {
1217 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1218 (device
->device_id
& 0xfff))
1227 * video : video bus device
1232 * Call _DOD to enumerate all devices attached to display adapter
1236 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1241 struct acpi_video_enumerated_device
*active_list
;
1242 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1243 union acpi_object
*dod
= NULL
;
1244 union acpi_object
*obj
;
1246 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1247 if (!ACPI_SUCCESS(status
)) {
1248 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1252 dod
= buffer
.pointer
;
1253 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1254 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1259 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1260 dod
->package
.count
));
1262 active_list
= kcalloc(1 + dod
->package
.count
,
1263 sizeof(struct acpi_video_enumerated_device
),
1271 for (i
= 0; i
< dod
->package
.count
; i
++) {
1272 obj
= &dod
->package
.elements
[i
];
1274 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1275 printk(KERN_ERR PREFIX
1276 "Invalid _DOD data in element %d\n", i
);
1280 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1281 active_list
[count
].bind_info
= NULL
;
1282 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1283 (int)obj
->integer
.value
));
1287 kfree(video
->attached_array
);
1289 video
->attached_array
= active_list
;
1290 video
->attached_count
= count
;
1293 kfree(buffer
.pointer
);
1298 acpi_video_get_next_level(struct acpi_video_device
*device
,
1299 u32 level_current
, u32 event
)
1301 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1302 max
= max_below
= 0;
1303 min
= min_above
= 255;
1304 /* Find closest level to level_current */
1305 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1306 l
= device
->brightness
->levels
[i
];
1307 if (abs(l
- level_current
) < abs(delta
)) {
1308 delta
= l
- level_current
;
1313 /* Ajust level_current to closest available level */
1314 level_current
+= delta
;
1315 for (i
= 2; i
< device
->brightness
->count
; i
++) {
1316 l
= device
->brightness
->levels
[i
];
1321 if (l
< min_above
&& l
> level_current
)
1323 if (l
> max_below
&& l
< level_current
)
1328 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1329 return (level_current
< max
) ? min_above
: min
;
1330 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1331 return (level_current
< max
) ? min_above
: max
;
1332 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1333 return (level_current
> min
) ? max_below
: min
;
1334 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1335 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1338 return level_current
;
1343 acpi_video_switch_brightness(struct work_struct
*work
)
1345 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1346 struct acpi_video_device
, switch_brightness_work
);
1347 unsigned long long level_current
, level_next
;
1348 int event
= device
->switch_brightness_event
;
1349 int result
= -EINVAL
;
1351 /* no warning message if acpi_backlight=vendor or a quirk is used */
1352 if (!device
->backlight
)
1355 if (!device
->brightness
)
1358 result
= acpi_video_device_lcd_get_level_current(device
,
1364 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1366 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1369 backlight_force_update(device
->backlight
,
1370 BACKLIGHT_UPDATE_HOTKEY
);
1374 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1377 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1380 struct acpi_video_bus
*video
;
1381 struct acpi_video_device
*video_device
;
1382 union acpi_object
*buffer
= NULL
;
1386 if (!device
|| !acpi_driver_data(device
))
1389 video
= acpi_driver_data(device
);
1391 for (i
= 0; i
< video
->attached_count
; i
++) {
1392 video_device
= video
->attached_array
[i
].bind_info
;
1398 if (!video_device
->cap
._DDC
)
1403 case ACPI_VIDEO_DISPLAY_CRT
:
1404 if (!video_device
->flags
.crt
)
1407 case ACPI_VIDEO_DISPLAY_TV
:
1408 if (!video_device
->flags
.tvout
)
1411 case ACPI_VIDEO_DISPLAY_DVI
:
1412 if (!video_device
->flags
.dvi
)
1415 case ACPI_VIDEO_DISPLAY_LCD
:
1416 if (!video_device
->flags
.lcd
)
1420 } else if (video_device
->device_id
!= device_id
) {
1424 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1426 if (ACPI_FAILURE(status
) || !buffer
||
1427 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1429 status
= acpi_video_device_EDID(video_device
, &buffer
,
1431 if (ACPI_FAILURE(status
) || !buffer
||
1432 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1437 *edid
= buffer
->buffer
.pointer
;
1443 EXPORT_SYMBOL(acpi_video_get_edid
);
1446 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1447 struct acpi_device
*device
)
1450 struct acpi_device
*dev
;
1453 * There are systems where video module known to work fine regardless
1454 * of broken _DOD and ignoring returned value here doesn't cause
1457 acpi_video_device_enumerate(video
);
1459 list_for_each_entry(dev
, &device
->children
, node
) {
1461 status
= acpi_video_bus_get_one_device(dev
, video
);
1463 dev_err(&dev
->dev
, "Can't attach device\n");
1466 video
->child_count
++;
1471 /* acpi_video interface */
1474 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1475 * preform any automatic brightness change on receiving a notification.
1477 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1479 return acpi_video_bus_DOS(video
, 0,
1480 acpi_osi_is_win8() ? 1 : 0);
1483 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1485 return acpi_video_bus_DOS(video
, 0,
1486 acpi_osi_is_win8() ? 0 : 1);
1489 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1491 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1492 struct input_dev
*input
;
1495 if (!video
|| !video
->input
)
1498 input
= video
->input
;
1501 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1502 * most likely via hotkey. */
1503 keycode
= KEY_SWITCHVIDEOMODE
;
1506 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1508 acpi_video_device_enumerate(video
);
1509 acpi_video_device_rebind(video
);
1510 keycode
= KEY_SWITCHVIDEOMODE
;
1513 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1514 keycode
= KEY_SWITCHVIDEOMODE
;
1516 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1517 keycode
= KEY_VIDEO_NEXT
;
1519 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1520 keycode
= KEY_VIDEO_PREV
;
1524 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1525 "Unsupported event [0x%x]\n", event
));
1529 if (acpi_notifier_call_chain(device
, event
, 0))
1530 /* Something vetoed the keypress. */
1533 if (keycode
&& (report_key_events
& REPORT_OUTPUT_KEY_EVENTS
)) {
1534 input_report_key(input
, keycode
, 1);
1536 input_report_key(input
, keycode
, 0);
1543 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1546 if (!brightness_switch_enabled
)
1549 video_device
->switch_brightness_event
= event
;
1550 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1553 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1555 struct acpi_video_device
*video_device
= data
;
1556 struct acpi_device
*device
= NULL
;
1557 struct acpi_video_bus
*bus
;
1558 struct input_dev
*input
;
1564 device
= video_device
->dev
;
1565 bus
= video_device
->video
;
1569 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1570 brightness_switch_event(video_device
, event
);
1571 keycode
= KEY_BRIGHTNESS_CYCLE
;
1573 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1574 brightness_switch_event(video_device
, event
);
1575 keycode
= KEY_BRIGHTNESSUP
;
1577 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1578 brightness_switch_event(video_device
, event
);
1579 keycode
= KEY_BRIGHTNESSDOWN
;
1581 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1582 brightness_switch_event(video_device
, event
);
1583 keycode
= KEY_BRIGHTNESS_ZERO
;
1585 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1586 brightness_switch_event(video_device
, event
);
1587 keycode
= KEY_DISPLAY_OFF
;
1590 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1591 "Unsupported event [0x%x]\n", event
));
1595 acpi_notifier_call_chain(device
, event
, 0);
1597 if (keycode
&& (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
)) {
1598 input_report_key(input
, keycode
, 1);
1600 input_report_key(input
, keycode
, 0);
1607 static int acpi_video_resume(struct notifier_block
*nb
,
1608 unsigned long val
, void *ign
)
1610 struct acpi_video_bus
*video
;
1611 struct acpi_video_device
*video_device
;
1615 case PM_HIBERNATION_PREPARE
:
1616 case PM_SUSPEND_PREPARE
:
1617 case PM_RESTORE_PREPARE
:
1621 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1623 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1625 for (i
= 0; i
< video
->attached_count
; i
++) {
1626 video_device
= video
->attached_array
[i
].bind_info
;
1627 if (video_device
&& video_device
->brightness
)
1628 acpi_video_device_lcd_set_level(video_device
,
1629 video_device
->brightness
->curr
);
1636 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1637 void **return_value
)
1639 struct acpi_device
*device
= context
;
1640 struct acpi_device
*sibling
;
1643 if (handle
== device
->handle
)
1644 return AE_CTRL_TERMINATE
;
1646 result
= acpi_bus_get_device(handle
, &sibling
);
1650 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1651 return AE_ALREADY_EXISTS
;
1656 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1658 struct backlight_properties props
;
1659 struct pci_dev
*pdev
;
1660 acpi_handle acpi_parent
;
1661 struct device
*parent
= NULL
;
1666 result
= acpi_video_init_brightness(device
);
1670 if (disable_backlight_sysfs_if
> 0)
1673 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1678 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1680 pdev
= acpi_get_pci_dev(acpi_parent
);
1682 parent
= &pdev
->dev
;
1686 memset(&props
, 0, sizeof(struct backlight_properties
));
1687 props
.type
= BACKLIGHT_FIRMWARE
;
1688 props
.max_brightness
= device
->brightness
->count
- 3;
1689 device
->backlight
= backlight_device_register(name
,
1692 &acpi_backlight_ops
,
1695 if (IS_ERR(device
->backlight
)) {
1696 device
->backlight
= NULL
;
1701 * Save current brightness level in case we have to restore it
1702 * before acpi_video_device_lcd_set_level() is called next time.
1704 device
->backlight
->props
.brightness
=
1705 acpi_video_get_brightness(device
->backlight
);
1707 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1708 device
->dev
, &video_cooling_ops
);
1709 if (IS_ERR(device
->cooling_dev
)) {
1711 * Set cooling_dev to NULL so we don't crash trying to free it.
1712 * Also, why the hell we are returning early and not attempt to
1713 * register video output if cooling device registration failed?
1716 device
->cooling_dev
= NULL
;
1720 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1721 device
->cooling_dev
->id
);
1722 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1723 &device
->cooling_dev
->device
.kobj
,
1726 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1727 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1728 &device
->dev
->dev
.kobj
, "device");
1730 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1733 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1735 struct acpi_video_device
*dev
;
1736 union acpi_object
*levels
;
1738 mutex_lock(&video
->device_list_lock
);
1739 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1740 if (!acpi_video_device_lcd_query_levels(dev
, &levels
))
1743 mutex_unlock(&video
->device_list_lock
);
1746 static bool acpi_video_should_register_backlight(struct acpi_video_device
*dev
)
1749 * Do not create backlight device for video output
1750 * device that is not in the enumerated list.
1752 if (!acpi_video_device_in_dod(dev
)) {
1753 dev_dbg(&dev
->dev
->dev
, "not in _DOD list, ignore\n");
1758 return dev
->flags
.lcd
;
1762 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1764 struct acpi_video_device
*dev
;
1766 if (video
->backlight_registered
)
1769 acpi_video_run_bcl_for_osi(video
);
1771 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1774 mutex_lock(&video
->device_list_lock
);
1775 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1776 if (acpi_video_should_register_backlight(dev
))
1777 acpi_video_dev_register_backlight(dev
);
1779 mutex_unlock(&video
->device_list_lock
);
1781 video
->backlight_registered
= true;
1783 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1784 video
->pm_nb
.priority
= 0;
1785 return register_pm_notifier(&video
->pm_nb
);
1788 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1790 if (device
->backlight
) {
1791 backlight_device_unregister(device
->backlight
);
1792 device
->backlight
= NULL
;
1794 if (device
->brightness
) {
1795 kfree(device
->brightness
->levels
);
1796 kfree(device
->brightness
);
1797 device
->brightness
= NULL
;
1799 if (device
->cooling_dev
) {
1800 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1801 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1802 thermal_cooling_device_unregister(device
->cooling_dev
);
1803 device
->cooling_dev
= NULL
;
1807 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1809 struct acpi_video_device
*dev
;
1812 if (!video
->backlight_registered
)
1815 error
= unregister_pm_notifier(&video
->pm_nb
);
1817 mutex_lock(&video
->device_list_lock
);
1818 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1819 acpi_video_dev_unregister_backlight(dev
);
1820 mutex_unlock(&video
->device_list_lock
);
1822 video
->backlight_registered
= false;
1827 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1830 struct acpi_device
*adev
= device
->dev
;
1832 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1833 acpi_video_device_notify
, device
);
1834 if (ACPI_FAILURE(status
))
1835 dev_err(&adev
->dev
, "Error installing notify handler\n");
1837 device
->flags
.notify
= 1;
1840 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1842 struct input_dev
*input
;
1843 struct acpi_video_device
*dev
;
1846 video
->input
= input
= input_allocate_device();
1852 error
= acpi_video_bus_start_devices(video
);
1854 goto err_free_input
;
1856 snprintf(video
->phys
, sizeof(video
->phys
),
1857 "%s/video/input0", acpi_device_hid(video
->device
));
1859 input
->name
= acpi_device_name(video
->device
);
1860 input
->phys
= video
->phys
;
1861 input
->id
.bustype
= BUS_HOST
;
1862 input
->id
.product
= 0x06;
1863 input
->dev
.parent
= &video
->device
->dev
;
1864 input
->evbit
[0] = BIT(EV_KEY
);
1865 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1866 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1867 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1868 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1869 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1870 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1871 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1872 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1874 error
= input_register_device(input
);
1878 mutex_lock(&video
->device_list_lock
);
1879 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1880 acpi_video_dev_add_notify_handler(dev
);
1881 mutex_unlock(&video
->device_list_lock
);
1886 acpi_video_bus_stop_devices(video
);
1888 input_free_device(input
);
1889 video
->input
= NULL
;
1894 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1896 if (dev
->flags
.notify
) {
1897 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1898 acpi_video_device_notify
);
1899 dev
->flags
.notify
= 0;
1903 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
1905 struct acpi_video_device
*dev
;
1907 mutex_lock(&video
->device_list_lock
);
1908 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1909 acpi_video_dev_remove_notify_handler(dev
);
1910 mutex_unlock(&video
->device_list_lock
);
1912 acpi_video_bus_stop_devices(video
);
1913 input_unregister_device(video
->input
);
1914 video
->input
= NULL
;
1917 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
1919 struct acpi_video_device
*dev
, *next
;
1921 mutex_lock(&video
->device_list_lock
);
1922 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
1923 list_del(&dev
->entry
);
1926 mutex_unlock(&video
->device_list_lock
);
1931 static int instance
;
1933 static int acpi_video_bus_add(struct acpi_device
*device
)
1935 struct acpi_video_bus
*video
;
1939 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
1940 device
->parent
->handle
, 1,
1941 acpi_video_bus_match
, NULL
,
1943 if (status
== AE_ALREADY_EXISTS
) {
1944 printk(KERN_WARNING FW_BUG
1945 "Duplicate ACPI video bus devices for the"
1946 " same VGA controller, please try module "
1947 "parameter \"video.allow_duplicates=1\""
1948 "if the current driver doesn't work.\n");
1949 if (!allow_duplicates
)
1953 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
1957 /* a hack to fix the duplicate name "VID" problem on T61 */
1958 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
1960 device
->pnp
.bus_id
[3] = '0' + instance
;
1963 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1964 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
1966 device
->pnp
.bus_id
[3] = '0' + instance
;
1970 video
->device
= device
;
1971 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
1972 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1973 device
->driver_data
= video
;
1975 acpi_video_bus_find_cap(video
);
1976 error
= acpi_video_bus_check(video
);
1978 goto err_free_video
;
1980 mutex_init(&video
->device_list_lock
);
1981 INIT_LIST_HEAD(&video
->video_device_list
);
1983 error
= acpi_video_bus_get_devices(video
, device
);
1987 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
1988 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
1989 video
->flags
.multihead
? "yes" : "no",
1990 video
->flags
.rom
? "yes" : "no",
1991 video
->flags
.post
? "yes" : "no");
1992 mutex_lock(&video_list_lock
);
1993 list_add_tail(&video
->entry
, &video_bus_head
);
1994 mutex_unlock(&video_list_lock
);
1996 acpi_video_bus_register_backlight(video
);
1997 acpi_video_bus_add_notify_handler(video
);
2002 acpi_video_bus_put_devices(video
);
2003 kfree(video
->attached_array
);
2006 device
->driver_data
= NULL
;
2011 static int acpi_video_bus_remove(struct acpi_device
*device
)
2013 struct acpi_video_bus
*video
= NULL
;
2016 if (!device
|| !acpi_driver_data(device
))
2019 video
= acpi_driver_data(device
);
2021 acpi_video_bus_remove_notify_handler(video
);
2022 acpi_video_bus_unregister_backlight(video
);
2023 acpi_video_bus_put_devices(video
);
2025 mutex_lock(&video_list_lock
);
2026 list_del(&video
->entry
);
2027 mutex_unlock(&video_list_lock
);
2029 kfree(video
->attached_array
);
2035 static int __init
is_i740(struct pci_dev
*dev
)
2037 if (dev
->device
== 0x00D1)
2039 if (dev
->device
== 0x7000)
2044 static int __init
intel_opregion_present(void)
2047 struct pci_dev
*dev
= NULL
;
2050 for_each_pci_dev(dev
) {
2051 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2053 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2055 /* We don't want to poke around undefined i740 registers */
2058 pci_read_config_dword(dev
, 0xfc, &address
);
2066 int acpi_video_register(void)
2070 mutex_lock(®ister_count_mutex
);
2071 if (register_count
) {
2073 * if the function of acpi_video_register is already called,
2074 * don't register the acpi_vide_bus again and return no error.
2079 dmi_check_system(video_dmi_table
);
2081 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2086 * When the acpi_video_bus is loaded successfully, increase
2087 * the counter reference.
2092 mutex_unlock(®ister_count_mutex
);
2095 EXPORT_SYMBOL(acpi_video_register
);
2097 void acpi_video_unregister(void)
2099 mutex_lock(®ister_count_mutex
);
2100 if (register_count
) {
2101 acpi_bus_unregister_driver(&acpi_video_bus
);
2104 mutex_unlock(®ister_count_mutex
);
2106 EXPORT_SYMBOL(acpi_video_unregister
);
2108 void acpi_video_unregister_backlight(void)
2110 struct acpi_video_bus
*video
;
2112 mutex_lock(®ister_count_mutex
);
2113 if (register_count
) {
2114 mutex_lock(&video_list_lock
);
2115 list_for_each_entry(video
, &video_bus_head
, entry
)
2116 acpi_video_bus_unregister_backlight(video
);
2117 mutex_unlock(&video_list_lock
);
2119 mutex_unlock(®ister_count_mutex
);
2122 bool acpi_video_handles_brightness_key_presses(void)
2124 bool have_video_busses
;
2126 mutex_lock(&video_list_lock
);
2127 have_video_busses
= !list_empty(&video_bus_head
);
2128 mutex_unlock(&video_list_lock
);
2130 return have_video_busses
&&
2131 (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
);
2133 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses
);
2136 * This is kind of nasty. Hardware using Intel chipsets may require
2137 * the video opregion code to be run first in order to initialise
2138 * state before any ACPI video calls are made. To handle this we defer
2139 * registration of the video class until the opregion code has run.
2142 static int __init
acpi_video_init(void)
2145 * Let the module load even if ACPI is disabled (e.g. due to
2146 * a broken BIOS) so that i915.ko can still be loaded on such
2147 * old systems without an AcpiOpRegion.
2149 * acpi_video_register() will report -ENODEV later as well due
2150 * to acpi_disabled when i915.ko tries to register itself afterwards.
2155 if (intel_opregion_present())
2158 return acpi_video_register();
2161 static void __exit
acpi_video_exit(void)
2163 acpi_video_detect_exit();
2164 acpi_video_unregister();
2169 module_init(acpi_video_init
);
2170 module_exit(acpi_video_exit
);