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 <linux/uaccess.h>
42 #define PREFIX "ACPI: "
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
47 #define MAX_NAME_LEN 20
49 #define _COMPONENT ACPI_VIDEO_COMPONENT
50 ACPI_MODULE_NAME("video");
52 MODULE_AUTHOR("Bruno Ducrot");
53 MODULE_DESCRIPTION("ACPI Video Driver");
54 MODULE_LICENSE("GPL");
56 static bool brightness_switch_enabled
= 1;
57 module_param(brightness_switch_enabled
, bool, 0644);
60 * By default, we don't allow duplicate ACPI video bus devices
61 * under the same VGA controller
63 static bool allow_duplicates
;
64 module_param(allow_duplicates
, bool, 0644);
66 static int disable_backlight_sysfs_if
= -1;
67 module_param(disable_backlight_sysfs_if
, int, 0444);
69 #define REPORT_OUTPUT_KEY_EVENTS 0x01
70 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
71 static int report_key_events
= -1;
72 module_param(report_key_events
, int, 0644);
73 MODULE_PARM_DESC(report_key_events
,
74 "0: none, 1: output changes, 2: brightness changes, 3: all");
76 static int hw_changes_brightness
= -1;
77 module_param(hw_changes_brightness
, int, 0644);
78 MODULE_PARM_DESC(hw_changes_brightness
,
79 "Set this to 1 on buggy hw which changes the brightness itself when "
80 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
83 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
84 * assumed even if not actually set.
86 static bool device_id_scheme
= false;
87 module_param(device_id_scheme
, bool, 0444);
89 static int only_lcd
= -1;
90 module_param(only_lcd
, int, 0444);
92 static int register_count
;
93 static DEFINE_MUTEX(register_count_mutex
);
94 static DEFINE_MUTEX(video_list_lock
);
95 static LIST_HEAD(video_bus_head
);
96 static int acpi_video_bus_add(struct acpi_device
*device
);
97 static int acpi_video_bus_remove(struct acpi_device
*device
);
98 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
);
99 void acpi_video_detect_exit(void);
102 * Indices in the _BCL method response: the first two items are special,
103 * the rest are all supported levels.
105 * See page 575 of the ACPI spec 3.0
107 enum acpi_video_level_idx
{
108 ACPI_VIDEO_AC_LEVEL
, /* level when machine has full power */
109 ACPI_VIDEO_BATTERY_LEVEL
, /* level when machine is on batteries */
110 ACPI_VIDEO_FIRST_LEVEL
, /* actual supported levels begin here */
113 static const struct acpi_device_id video_device_ids
[] = {
117 MODULE_DEVICE_TABLE(acpi
, video_device_ids
);
119 static struct acpi_driver acpi_video_bus
= {
121 .class = ACPI_VIDEO_CLASS
,
122 .ids
= video_device_ids
,
124 .add
= acpi_video_bus_add
,
125 .remove
= acpi_video_bus_remove
,
126 .notify
= acpi_video_bus_notify
,
130 struct acpi_video_bus_flags
{
131 u8 multihead
:1; /* can switch video heads */
132 u8 rom
:1; /* can retrieve a video rom */
133 u8 post
:1; /* can configure the head to */
137 struct acpi_video_bus_cap
{
138 u8 _DOS
:1; /* Enable/Disable output switching */
139 u8 _DOD
:1; /* Enumerate all devices attached to display adapter */
140 u8 _ROM
:1; /* Get ROM Data */
141 u8 _GPD
:1; /* Get POST Device */
142 u8 _SPD
:1; /* Set POST Device */
143 u8 _VPO
:1; /* Video POST Options */
147 struct acpi_video_device_attrib
{
148 u32 display_index
:4; /* A zero-based instance of the Display */
149 u32 display_port_attachment
:4; /* This field differentiates the display type */
150 u32 display_type
:4; /* Describe the specific type in use */
151 u32 vendor_specific
:4; /* Chipset Vendor Specific */
152 u32 bios_can_detect
:1; /* BIOS can detect the device */
153 u32 depend_on_vga
:1; /* Non-VGA output device whose power is related to
155 u32 pipe_id
:3; /* For VGA multiple-head devices. */
156 u32 reserved
:10; /* Must be 0 */
159 * The device ID might not actually follow the scheme described by this
160 * struct acpi_video_device_attrib. If it does, then this bit
161 * device_id_scheme is set; otherwise, other fields should be ignored.
163 * (but also see the global flag device_id_scheme)
165 u32 device_id_scheme
:1;
168 struct acpi_video_enumerated_device
{
171 struct acpi_video_device_attrib attrib
;
173 struct acpi_video_device
*bind_info
;
176 struct acpi_video_bus
{
177 struct acpi_device
*device
;
178 bool backlight_registered
;
180 struct acpi_video_enumerated_device
*attached_array
;
183 struct acpi_video_bus_cap cap
;
184 struct acpi_video_bus_flags flags
;
185 struct list_head video_device_list
;
186 struct mutex device_list_lock
; /* protects video_device_list */
187 struct list_head entry
;
188 struct input_dev
*input
;
189 char phys
[32]; /* for input device */
190 struct notifier_block pm_nb
;
193 struct acpi_video_device_flags
{
204 struct acpi_video_device_cap
{
205 u8 _ADR
:1; /* Return the unique ID */
206 u8 _BCL
:1; /* Query list of brightness control levels supported */
207 u8 _BCM
:1; /* Set the brightness level */
208 u8 _BQC
:1; /* Get current brightness level */
209 u8 _BCQ
:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
210 u8 _DDC
:1; /* Return the EDID for this device */
213 struct acpi_video_device
{
214 unsigned long device_id
;
215 struct acpi_video_device_flags flags
;
216 struct acpi_video_device_cap cap
;
217 struct list_head entry
;
218 struct delayed_work switch_brightness_work
;
219 int switch_brightness_event
;
220 struct acpi_video_bus
*video
;
221 struct acpi_device
*dev
;
222 struct acpi_video_device_brightness
*brightness
;
223 struct backlight_device
*backlight
;
224 struct thermal_cooling_device
*cooling_dev
;
227 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
);
228 static void acpi_video_device_rebind(struct acpi_video_bus
*video
);
229 static void acpi_video_device_bind(struct acpi_video_bus
*video
,
230 struct acpi_video_device
*device
);
231 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
);
232 static int acpi_video_device_lcd_set_level(struct acpi_video_device
*device
,
234 static int acpi_video_device_lcd_get_level_current(
235 struct acpi_video_device
*device
,
236 unsigned long long *level
, bool raw
);
237 static int acpi_video_get_next_level(struct acpi_video_device
*device
,
238 u32 level_current
, u32 event
);
239 static void acpi_video_switch_brightness(struct work_struct
*work
);
241 /* backlight device sysfs support */
242 static int acpi_video_get_brightness(struct backlight_device
*bd
)
244 unsigned long long cur_level
;
246 struct acpi_video_device
*vd
= bl_get_data(bd
);
248 if (acpi_video_device_lcd_get_level_current(vd
, &cur_level
, false))
250 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< vd
->brightness
->count
; i
++) {
251 if (vd
->brightness
->levels
[i
] == cur_level
)
252 return i
- ACPI_VIDEO_FIRST_LEVEL
;
257 static int acpi_video_set_brightness(struct backlight_device
*bd
)
259 int request_level
= bd
->props
.brightness
+ ACPI_VIDEO_FIRST_LEVEL
;
260 struct acpi_video_device
*vd
= bl_get_data(bd
);
262 cancel_delayed_work(&vd
->switch_brightness_work
);
263 return acpi_video_device_lcd_set_level(vd
,
264 vd
->brightness
->levels
[request_level
]);
267 static const struct backlight_ops acpi_backlight_ops
= {
268 .get_brightness
= acpi_video_get_brightness
,
269 .update_status
= acpi_video_set_brightness
,
272 /* thermal cooling device callbacks */
273 static int video_get_max_state(struct thermal_cooling_device
*cooling_dev
,
274 unsigned long *state
)
276 struct acpi_device
*device
= cooling_dev
->devdata
;
277 struct acpi_video_device
*video
= acpi_driver_data(device
);
279 *state
= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
283 static int video_get_cur_state(struct thermal_cooling_device
*cooling_dev
,
284 unsigned long *state
)
286 struct acpi_device
*device
= cooling_dev
->devdata
;
287 struct acpi_video_device
*video
= acpi_driver_data(device
);
288 unsigned long long level
;
291 if (acpi_video_device_lcd_get_level_current(video
, &level
, false))
293 for (offset
= ACPI_VIDEO_FIRST_LEVEL
; offset
< video
->brightness
->count
;
295 if (level
== video
->brightness
->levels
[offset
]) {
296 *state
= video
->brightness
->count
- offset
- 1;
304 video_set_cur_state(struct thermal_cooling_device
*cooling_dev
, unsigned long state
)
306 struct acpi_device
*device
= cooling_dev
->devdata
;
307 struct acpi_video_device
*video
= acpi_driver_data(device
);
310 if (state
>= video
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
)
313 state
= video
->brightness
->count
- state
;
314 level
= video
->brightness
->levels
[state
- 1];
315 return acpi_video_device_lcd_set_level(video
, level
);
318 static const struct thermal_cooling_device_ops video_cooling_ops
= {
319 .get_max_state
= video_get_max_state
,
320 .get_cur_state
= video_get_cur_state
,
321 .set_cur_state
= video_set_cur_state
,
325 * --------------------------------------------------------------------------
327 * --------------------------------------------------------------------------
331 acpi_video_device_lcd_query_levels(acpi_handle handle
,
332 union acpi_object
**levels
)
335 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
336 union acpi_object
*obj
;
341 status
= acpi_evaluate_object(handle
, "_BCL", NULL
, &buffer
);
342 if (!ACPI_SUCCESS(status
))
344 obj
= (union acpi_object
*)buffer
.pointer
;
345 if (!obj
|| (obj
->type
!= ACPI_TYPE_PACKAGE
)) {
346 printk(KERN_ERR PREFIX
"Invalid _BCL data\n");
356 kfree(buffer
.pointer
);
362 acpi_video_device_lcd_set_level(struct acpi_video_device
*device
, int level
)
367 status
= acpi_execute_simple_method(device
->dev
->handle
,
369 if (ACPI_FAILURE(status
)) {
370 ACPI_ERROR((AE_INFO
, "Evaluating _BCM failed"));
374 device
->brightness
->curr
= level
;
375 for (state
= ACPI_VIDEO_FIRST_LEVEL
; state
< device
->brightness
->count
;
377 if (level
== device
->brightness
->levels
[state
]) {
378 if (device
->backlight
)
379 device
->backlight
->props
.brightness
=
380 state
- ACPI_VIDEO_FIRST_LEVEL
;
384 ACPI_ERROR((AE_INFO
, "Current brightness invalid"));
389 * For some buggy _BQC methods, we need to add a constant value to
390 * the _BQC return value to get the actual current brightness level
393 static int bqc_offset_aml_bug_workaround
;
394 static int video_set_bqc_offset(const struct dmi_system_id
*d
)
396 bqc_offset_aml_bug_workaround
= 9;
400 static int video_disable_backlight_sysfs_if(
401 const struct dmi_system_id
*d
)
403 if (disable_backlight_sysfs_if
== -1)
404 disable_backlight_sysfs_if
= 1;
408 static int video_set_device_id_scheme(const struct dmi_system_id
*d
)
410 device_id_scheme
= true;
414 static int video_enable_only_lcd(const struct dmi_system_id
*d
)
420 static int video_set_report_key_events(const struct dmi_system_id
*id
)
422 if (report_key_events
== -1)
423 report_key_events
= (uintptr_t)id
->driver_data
;
427 static int video_hw_changes_brightness(
428 const struct dmi_system_id
*d
)
430 if (hw_changes_brightness
== -1)
431 hw_changes_brightness
= 1;
435 static const struct dmi_system_id video_dmi_table
[] = {
437 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
440 .callback
= video_set_bqc_offset
,
441 .ident
= "Acer Aspire 5720",
443 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
444 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5720"),
448 .callback
= video_set_bqc_offset
,
449 .ident
= "Acer Aspire 5710Z",
451 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
452 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5710Z"),
456 .callback
= video_set_bqc_offset
,
457 .ident
= "eMachines E510",
459 DMI_MATCH(DMI_BOARD_VENDOR
, "EMACHINES"),
460 DMI_MATCH(DMI_PRODUCT_NAME
, "eMachines E510"),
464 .callback
= video_set_bqc_offset
,
465 .ident
= "Acer Aspire 5315",
467 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
468 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 5315"),
472 .callback
= video_set_bqc_offset
,
473 .ident
= "Acer Aspire 7720",
475 DMI_MATCH(DMI_BOARD_VENDOR
, "Acer"),
476 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire 7720"),
481 * Some machines have a broken acpi-video interface for brightness
482 * control, but still need an acpi_video_device_lcd_set_level() call
483 * on resume to turn the backlight power on. We Enable backlight
484 * control on these systems, but do not register a backlight sysfs
485 * as brightness control does not work.
488 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
489 .callback
= video_disable_backlight_sysfs_if
,
490 .ident
= "Toshiba Portege R700",
492 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
493 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R700"),
497 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
498 .callback
= video_disable_backlight_sysfs_if
,
499 .ident
= "Toshiba Portege R830",
501 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
502 DMI_MATCH(DMI_PRODUCT_NAME
, "PORTEGE R830"),
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
507 .callback
= video_disable_backlight_sysfs_if
,
508 .ident
= "Toshiba Satellite R830",
510 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
511 DMI_MATCH(DMI_PRODUCT_NAME
, "SATELLITE R830"),
515 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
516 * but the IDs actually follow the Device ID Scheme.
519 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
520 .callback
= video_set_device_id_scheme
,
521 .ident
= "ESPRIMO Mobile M9410",
523 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
524 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
528 * Some machines have multiple video output devices, but only the one
529 * that is the type of LCD can do the backlight control so we should not
530 * register backlight interface for other video output devices.
533 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
534 .callback
= video_enable_only_lcd
,
535 .ident
= "ESPRIMO Mobile M9410",
537 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
538 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile M9410"),
542 * Some machines report wrong key events on the acpi-bus, suppress
543 * key event reporting on these. Note this is only intended to work
544 * around events which are plain wrong. In some cases we get double
545 * events, in this case acpi-video is considered the canonical source
546 * and the events from the other source should be filtered. E.g.
547 * by calling acpi_video_handles_brightness_key_presses() from the
548 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
551 .callback
= video_set_report_key_events
,
552 .driver_data
= (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS
),
553 .ident
= "Dell Vostro V131",
555 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
556 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro V131"),
560 * Some machines change the brightness themselves when a brightness
561 * hotkey gets pressed, despite us telling them not to. In this case
562 * acpi_video_device_notify() should only call backlight_force_update(
563 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
566 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
567 .callback
= video_hw_changes_brightness
,
568 .ident
= "Packard Bell EasyNote MZ35",
570 DMI_MATCH(DMI_SYS_VENDOR
, "Packard Bell"),
571 DMI_MATCH(DMI_PRODUCT_NAME
, "EasyNote MZ35"),
577 static unsigned long long
578 acpi_video_bqc_value_to_level(struct acpi_video_device
*device
,
579 unsigned long long bqc_value
)
581 unsigned long long level
;
583 if (device
->brightness
->flags
._BQC_use_index
) {
585 * _BQC returns an index that doesn't account for the first 2
586 * items with special meaning (see enum acpi_video_level_idx),
587 * so we need to compensate for that by offsetting ourselves
589 if (device
->brightness
->flags
._BCL_reversed
)
590 bqc_value
= device
->brightness
->count
-
591 ACPI_VIDEO_FIRST_LEVEL
- 1 - bqc_value
;
593 level
= device
->brightness
->levels
[bqc_value
+
594 ACPI_VIDEO_FIRST_LEVEL
];
599 level
+= bqc_offset_aml_bug_workaround
;
605 acpi_video_device_lcd_get_level_current(struct acpi_video_device
*device
,
606 unsigned long long *level
, bool raw
)
608 acpi_status status
= AE_OK
;
611 if (device
->cap
._BQC
|| device
->cap
._BCQ
) {
612 char *buf
= device
->cap
._BQC
? "_BQC" : "_BCQ";
614 status
= acpi_evaluate_integer(device
->dev
->handle
, buf
,
616 if (ACPI_SUCCESS(status
)) {
619 * Caller has indicated he wants the raw
620 * value returned by _BQC, so don't furtherly
621 * mess with the value.
626 *level
= acpi_video_bqc_value_to_level(device
, *level
);
628 for (i
= ACPI_VIDEO_FIRST_LEVEL
;
629 i
< device
->brightness
->count
; i
++)
630 if (device
->brightness
->levels
[i
] == *level
) {
631 device
->brightness
->curr
= *level
;
635 * BQC returned an invalid level.
638 ACPI_WARNING((AE_INFO
,
639 "%s returned an invalid level",
641 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
645 * should we return an error or ignore this failure?
646 * dev->brightness->curr is a cached value which stores
647 * the correct current backlight level in most cases.
648 * ACPI video backlight still works w/ buggy _BQC.
649 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
651 ACPI_WARNING((AE_INFO
, "Evaluating %s failed", buf
));
652 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
656 *level
= device
->brightness
->curr
;
661 acpi_video_device_EDID(struct acpi_video_device
*device
,
662 union acpi_object
**edid
, ssize_t length
)
665 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
666 union acpi_object
*obj
;
667 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
668 struct acpi_object_list args
= { 1, &arg0
};
676 arg0
.integer
.value
= 1;
677 else if (length
== 256)
678 arg0
.integer
.value
= 2;
682 status
= acpi_evaluate_object(device
->dev
->handle
, "_DDC", &args
, &buffer
);
683 if (ACPI_FAILURE(status
))
686 obj
= buffer
.pointer
;
688 if (obj
&& obj
->type
== ACPI_TYPE_BUFFER
)
691 printk(KERN_ERR PREFIX
"Invalid _DDC data\n");
703 * video : video bus device pointer
705 * 0. The system BIOS should NOT automatically switch(toggle)
706 * the active display output.
707 * 1. The system BIOS should automatically switch (toggle) the
708 * active display output. No switch event.
709 * 2. The _DGS value should be locked.
710 * 3. The system BIOS should not automatically switch (toggle) the
711 * active display output, but instead generate the display switch
714 * 0. The system BIOS should automatically control the brightness level
715 * of the LCD when the power changes from AC to DC
716 * 1. The system BIOS should NOT automatically control the brightness
717 * level of the LCD when the power changes from AC to DC.
723 acpi_video_bus_DOS(struct acpi_video_bus
*video
, int bios_flag
, int lcd_flag
)
727 if (!video
->cap
._DOS
)
730 if (bios_flag
< 0 || bios_flag
> 3 || lcd_flag
< 0 || lcd_flag
> 1)
732 video
->dos_setting
= (lcd_flag
<< 2) | bios_flag
;
733 status
= acpi_execute_simple_method(video
->device
->handle
, "_DOS",
734 (lcd_flag
<< 2) | bios_flag
);
735 if (ACPI_FAILURE(status
))
742 * Simple comparison function used to sort backlight levels.
746 acpi_video_cmp_level(const void *a
, const void *b
)
748 return *(int *)a
- *(int *)b
;
752 * Decides if _BQC/_BCQ for this system is usable
754 * We do this by changing the level first and then read out the current
755 * brightness level, if the value does not match, find out if it is using
756 * index. If not, clear the _BQC/_BCQ capability.
758 static int acpi_video_bqc_quirk(struct acpi_video_device
*device
,
759 int max_level
, int current_level
)
761 struct acpi_video_device_brightness
*br
= device
->brightness
;
763 unsigned long long level
;
766 /* don't mess with existing known broken systems */
767 if (bqc_offset_aml_bug_workaround
)
771 * Some systems always report current brightness level as maximum
772 * through _BQC, we need to test another value for them. However,
773 * there is a subtlety:
775 * If the _BCL package ordering is descending, the first level
776 * (br->levels[2]) is likely to be 0, and if the number of levels
777 * matches the number of steps, we might confuse a returned level to
782 * current_level = max_level = 100
784 * returned level = 100
786 * In this case 100 means the level, not the index, and _BCM failed.
787 * Still, if the _BCL package ordering is descending, the index of
788 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
790 * This causes all _BQC calls to return bogus values causing weird
791 * behavior from the user's perspective. For example:
793 * xbacklight -set 10; xbacklight -set 20;
795 * would flash to 90% and then slowly down to the desired level (20).
797 * The solution is simple; test anything other than the first level
800 test_level
= current_level
== max_level
801 ? br
->levels
[ACPI_VIDEO_FIRST_LEVEL
+ 1]
804 result
= acpi_video_device_lcd_set_level(device
, test_level
);
808 result
= acpi_video_device_lcd_get_level_current(device
, &level
, true);
812 if (level
!= test_level
) {
813 /* buggy _BQC found, need to find out if it uses index */
814 if (level
< br
->count
) {
815 if (br
->flags
._BCL_reversed
)
816 level
= br
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1 - level
;
817 if (br
->levels
[level
+ ACPI_VIDEO_FIRST_LEVEL
] == test_level
)
818 br
->flags
._BQC_use_index
= 1;
821 if (!br
->flags
._BQC_use_index
)
822 device
->cap
._BQC
= device
->cap
._BCQ
= 0;
828 int acpi_video_get_levels(struct acpi_device
*device
,
829 struct acpi_video_device_brightness
**dev_br
,
832 union acpi_object
*obj
= NULL
;
833 int i
, max_level
= 0, count
= 0, level_ac_battery
= 0;
834 union acpi_object
*o
;
835 struct acpi_video_device_brightness
*br
= NULL
;
839 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device
->handle
,
841 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Could not query available "
842 "LCD brightness level\n"));
847 if (obj
->package
.count
< ACPI_VIDEO_FIRST_LEVEL
) {
852 br
= kzalloc(sizeof(*br
), GFP_KERNEL
);
854 printk(KERN_ERR
"can't allocate memory\n");
860 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
861 * in order to account for buggy BIOS which don't export the first two
862 * special levels (see below)
864 br
->levels
= kmalloc((obj
->package
.count
+ ACPI_VIDEO_FIRST_LEVEL
) *
865 sizeof(*br
->levels
), GFP_KERNEL
);
871 for (i
= 0; i
< obj
->package
.count
; i
++) {
872 o
= (union acpi_object
*)&obj
->package
.elements
[i
];
873 if (o
->type
!= ACPI_TYPE_INTEGER
) {
874 printk(KERN_ERR PREFIX
"Invalid data\n");
877 value
= (u32
) o
->integer
.value
;
878 /* Skip duplicate entries */
879 if (count
> ACPI_VIDEO_FIRST_LEVEL
880 && br
->levels
[count
- 1] == value
)
883 br
->levels
[count
] = value
;
885 if (br
->levels
[count
] > max_level
)
886 max_level
= br
->levels
[count
];
891 * some buggy BIOS don't export the levels
892 * when machine is on AC/Battery in _BCL package.
893 * In this case, the first two elements in _BCL packages
894 * are also supported brightness levels that OS should take care of.
896 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< count
; i
++) {
897 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_AC_LEVEL
])
899 if (br
->levels
[i
] == br
->levels
[ACPI_VIDEO_BATTERY_LEVEL
])
903 if (level_ac_battery
< ACPI_VIDEO_FIRST_LEVEL
) {
904 level_ac_battery
= ACPI_VIDEO_FIRST_LEVEL
- level_ac_battery
;
905 br
->flags
._BCL_no_ac_battery_levels
= 1;
906 for (i
= (count
- 1 + level_ac_battery
);
907 i
>= ACPI_VIDEO_FIRST_LEVEL
; i
--)
908 br
->levels
[i
] = br
->levels
[i
- level_ac_battery
];
909 count
+= level_ac_battery
;
910 } else if (level_ac_battery
> ACPI_VIDEO_FIRST_LEVEL
)
911 ACPI_ERROR((AE_INFO
, "Too many duplicates in _BCL package"));
913 /* Check if the _BCL package is in a reversed order */
914 if (max_level
== br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]) {
915 br
->flags
._BCL_reversed
= 1;
916 sort(&br
->levels
[ACPI_VIDEO_FIRST_LEVEL
],
917 count
- ACPI_VIDEO_FIRST_LEVEL
,
918 sizeof(br
->levels
[ACPI_VIDEO_FIRST_LEVEL
]),
919 acpi_video_cmp_level
, NULL
);
920 } else if (max_level
!= br
->levels
[count
- 1])
922 "Found unordered _BCL package"));
927 *pmax_level
= max_level
;
936 EXPORT_SYMBOL(acpi_video_get_levels
);
940 * device : video output device (LCD, CRT, ..)
943 * Maximum brightness level
945 * Allocate and initialize device->brightness.
949 acpi_video_init_brightness(struct acpi_video_device
*device
)
951 int i
, max_level
= 0;
952 unsigned long long level
, level_old
;
953 struct acpi_video_device_brightness
*br
= NULL
;
954 int result
= -EINVAL
;
956 result
= acpi_video_get_levels(device
->dev
, &br
, &max_level
);
959 device
->brightness
= br
;
961 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
962 br
->curr
= level
= max_level
;
964 if (!device
->cap
._BQC
)
967 result
= acpi_video_device_lcd_get_level_current(device
,
970 goto out_free_levels
;
972 result
= acpi_video_bqc_quirk(device
, max_level
, level_old
);
974 goto out_free_levels
;
976 * cap._BQC may get cleared due to _BQC is found to be broken
977 * in acpi_video_bqc_quirk, so check again here.
979 if (!device
->cap
._BQC
)
982 level
= acpi_video_bqc_value_to_level(device
, level_old
);
984 * On some buggy laptops, _BQC returns an uninitialized
985 * value when invoked for the first time, i.e.
986 * level_old is invalid (no matter whether it's a level
987 * or an index). Set the backlight to max_level in this case.
989 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< br
->count
; i
++)
990 if (level
== br
->levels
[i
])
992 if (i
== br
->count
|| !level
)
996 result
= acpi_video_device_lcd_set_level(device
, level
);
998 goto out_free_levels
;
1000 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1001 "found %d brightness levels\n",
1002 br
->count
- ACPI_VIDEO_FIRST_LEVEL
));
1008 device
->brightness
= NULL
;
1014 * device : video output device (LCD, CRT, ..)
1019 * Find out all required AML methods defined under the output
1023 static void acpi_video_device_find_cap(struct acpi_video_device
*device
)
1025 if (acpi_has_method(device
->dev
->handle
, "_ADR"))
1026 device
->cap
._ADR
= 1;
1027 if (acpi_has_method(device
->dev
->handle
, "_BCL"))
1028 device
->cap
._BCL
= 1;
1029 if (acpi_has_method(device
->dev
->handle
, "_BCM"))
1030 device
->cap
._BCM
= 1;
1031 if (acpi_has_method(device
->dev
->handle
, "_BQC")) {
1032 device
->cap
._BQC
= 1;
1033 } else if (acpi_has_method(device
->dev
->handle
, "_BCQ")) {
1034 printk(KERN_WARNING FW_BUG
"_BCQ is used instead of _BQC\n");
1035 device
->cap
._BCQ
= 1;
1038 if (acpi_has_method(device
->dev
->handle
, "_DDC"))
1039 device
->cap
._DDC
= 1;
1044 * device : video output device (VGA)
1049 * Find out all required AML methods defined under the video bus device.
1052 static void acpi_video_bus_find_cap(struct acpi_video_bus
*video
)
1054 if (acpi_has_method(video
->device
->handle
, "_DOS"))
1055 video
->cap
._DOS
= 1;
1056 if (acpi_has_method(video
->device
->handle
, "_DOD"))
1057 video
->cap
._DOD
= 1;
1058 if (acpi_has_method(video
->device
->handle
, "_ROM"))
1059 video
->cap
._ROM
= 1;
1060 if (acpi_has_method(video
->device
->handle
, "_GPD"))
1061 video
->cap
._GPD
= 1;
1062 if (acpi_has_method(video
->device
->handle
, "_SPD"))
1063 video
->cap
._SPD
= 1;
1064 if (acpi_has_method(video
->device
->handle
, "_VPO"))
1065 video
->cap
._VPO
= 1;
1069 * Check whether the video bus device has required AML method to
1070 * support the desired features
1073 static int acpi_video_bus_check(struct acpi_video_bus
*video
)
1075 acpi_status status
= -ENOENT
;
1076 struct pci_dev
*dev
;
1081 dev
= acpi_get_pci_dev(video
->device
->handle
);
1087 * Since there is no HID, CID and so on for VGA driver, we have
1088 * to check well known required nodes.
1091 /* Does this device support video switching? */
1092 if (video
->cap
._DOS
|| video
->cap
._DOD
) {
1093 if (!video
->cap
._DOS
) {
1094 printk(KERN_WARNING FW_BUG
1095 "ACPI(%s) defines _DOD but not _DOS\n",
1096 acpi_device_bid(video
->device
));
1098 video
->flags
.multihead
= 1;
1102 /* Does this device support retrieving a video ROM? */
1103 if (video
->cap
._ROM
) {
1104 video
->flags
.rom
= 1;
1108 /* Does this device support configuring which video device to POST? */
1109 if (video
->cap
._GPD
&& video
->cap
._SPD
&& video
->cap
._VPO
) {
1110 video
->flags
.post
= 1;
1118 * --------------------------------------------------------------------------
1120 * --------------------------------------------------------------------------
1123 /* device interface */
1124 static struct acpi_video_device_attrib
*
1125 acpi_video_get_device_attr(struct acpi_video_bus
*video
, unsigned long device_id
)
1127 struct acpi_video_enumerated_device
*ids
;
1130 for (i
= 0; i
< video
->attached_count
; i
++) {
1131 ids
= &video
->attached_array
[i
];
1132 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1133 return &ids
->value
.attrib
;
1140 acpi_video_get_device_type(struct acpi_video_bus
*video
,
1141 unsigned long device_id
)
1143 struct acpi_video_enumerated_device
*ids
;
1146 for (i
= 0; i
< video
->attached_count
; i
++) {
1147 ids
= &video
->attached_array
[i
];
1148 if ((ids
->value
.int_val
& 0xffff) == device_id
)
1149 return ids
->value
.int_val
;
1156 acpi_video_bus_get_one_device(struct acpi_device
*device
,
1157 struct acpi_video_bus
*video
)
1159 unsigned long long device_id
;
1160 int status
, device_type
;
1161 struct acpi_video_device
*data
;
1162 struct acpi_video_device_attrib
*attribute
;
1165 acpi_evaluate_integer(device
->handle
, "_ADR", NULL
, &device_id
);
1166 /* Some device omits _ADR, we skip them instead of fail */
1167 if (ACPI_FAILURE(status
))
1170 data
= kzalloc(sizeof(struct acpi_video_device
), GFP_KERNEL
);
1174 strcpy(acpi_device_name(device
), ACPI_VIDEO_DEVICE_NAME
);
1175 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
1176 device
->driver_data
= data
;
1178 data
->device_id
= device_id
;
1179 data
->video
= video
;
1181 INIT_DELAYED_WORK(&data
->switch_brightness_work
,
1182 acpi_video_switch_brightness
);
1184 attribute
= acpi_video_get_device_attr(video
, device_id
);
1186 if (attribute
&& (attribute
->device_id_scheme
|| device_id_scheme
)) {
1187 switch (attribute
->display_type
) {
1188 case ACPI_VIDEO_DISPLAY_CRT
:
1189 data
->flags
.crt
= 1;
1191 case ACPI_VIDEO_DISPLAY_TV
:
1192 data
->flags
.tvout
= 1;
1194 case ACPI_VIDEO_DISPLAY_DVI
:
1195 data
->flags
.dvi
= 1;
1197 case ACPI_VIDEO_DISPLAY_LCD
:
1198 data
->flags
.lcd
= 1;
1201 data
->flags
.unknown
= 1;
1204 if (attribute
->bios_can_detect
)
1205 data
->flags
.bios
= 1;
1207 /* Check for legacy IDs */
1208 device_type
= acpi_video_get_device_type(video
, device_id
);
1209 /* Ignore bits 16 and 18-20 */
1210 switch (device_type
& 0xffe2ffff) {
1211 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR
:
1212 data
->flags
.crt
= 1;
1214 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL
:
1215 data
->flags
.lcd
= 1;
1217 case ACPI_VIDEO_DISPLAY_LEGACY_TV
:
1218 data
->flags
.tvout
= 1;
1221 data
->flags
.unknown
= 1;
1225 acpi_video_device_bind(video
, data
);
1226 acpi_video_device_find_cap(data
);
1228 mutex_lock(&video
->device_list_lock
);
1229 list_add_tail(&data
->entry
, &video
->video_device_list
);
1230 mutex_unlock(&video
->device_list_lock
);
1237 * video : video bus device
1242 * Enumerate the video device list of the video bus,
1243 * bind the ids with the corresponding video devices
1244 * under the video bus.
1247 static void acpi_video_device_rebind(struct acpi_video_bus
*video
)
1249 struct acpi_video_device
*dev
;
1251 mutex_lock(&video
->device_list_lock
);
1253 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1254 acpi_video_device_bind(video
, dev
);
1256 mutex_unlock(&video
->device_list_lock
);
1261 * video : video bus device
1262 * device : video output device under the video
1268 * Bind the ids with the corresponding video devices
1269 * under the video bus.
1273 acpi_video_device_bind(struct acpi_video_bus
*video
,
1274 struct acpi_video_device
*device
)
1276 struct acpi_video_enumerated_device
*ids
;
1279 for (i
= 0; i
< video
->attached_count
; i
++) {
1280 ids
= &video
->attached_array
[i
];
1281 if (device
->device_id
== (ids
->value
.int_val
& 0xffff)) {
1282 ids
->bind_info
= device
;
1283 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "device_bind %d\n", i
));
1288 static bool acpi_video_device_in_dod(struct acpi_video_device
*device
)
1290 struct acpi_video_bus
*video
= device
->video
;
1294 * If we have a broken _DOD or we have more than 8 output devices
1295 * under the graphics controller node that we can't proper deal with
1296 * in the operation region code currently, no need to test.
1298 if (!video
->attached_count
|| video
->child_count
> 8)
1301 for (i
= 0; i
< video
->attached_count
; i
++) {
1302 if ((video
->attached_array
[i
].value
.int_val
& 0xfff) ==
1303 (device
->device_id
& 0xfff))
1312 * video : video bus device
1317 * Call _DOD to enumerate all devices attached to display adapter
1321 static int acpi_video_device_enumerate(struct acpi_video_bus
*video
)
1326 struct acpi_video_enumerated_device
*active_list
;
1327 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
1328 union acpi_object
*dod
= NULL
;
1329 union acpi_object
*obj
;
1331 if (!video
->cap
._DOD
)
1332 return AE_NOT_EXIST
;
1334 status
= acpi_evaluate_object(video
->device
->handle
, "_DOD", NULL
, &buffer
);
1335 if (!ACPI_SUCCESS(status
)) {
1336 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _DOD"));
1340 dod
= buffer
.pointer
;
1341 if (!dod
|| (dod
->type
!= ACPI_TYPE_PACKAGE
)) {
1342 ACPI_EXCEPTION((AE_INFO
, status
, "Invalid _DOD data"));
1347 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found %d video heads in _DOD\n",
1348 dod
->package
.count
));
1350 active_list
= kcalloc(1 + dod
->package
.count
,
1351 sizeof(struct acpi_video_enumerated_device
),
1359 for (i
= 0; i
< dod
->package
.count
; i
++) {
1360 obj
= &dod
->package
.elements
[i
];
1362 if (obj
->type
!= ACPI_TYPE_INTEGER
) {
1363 printk(KERN_ERR PREFIX
1364 "Invalid _DOD data in element %d\n", i
);
1368 active_list
[count
].value
.int_val
= obj
->integer
.value
;
1369 active_list
[count
].bind_info
= NULL
;
1370 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "dod element[%d] = %d\n", i
,
1371 (int)obj
->integer
.value
));
1375 kfree(video
->attached_array
);
1377 video
->attached_array
= active_list
;
1378 video
->attached_count
= count
;
1381 kfree(buffer
.pointer
);
1386 acpi_video_get_next_level(struct acpi_video_device
*device
,
1387 u32 level_current
, u32 event
)
1389 int min
, max
, min_above
, max_below
, i
, l
, delta
= 255;
1390 max
= max_below
= 0;
1391 min
= min_above
= 255;
1392 /* Find closest level to level_current */
1393 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1394 l
= device
->brightness
->levels
[i
];
1395 if (abs(l
- level_current
) < abs(delta
)) {
1396 delta
= l
- level_current
;
1401 /* Ajust level_current to closest available level */
1402 level_current
+= delta
;
1403 for (i
= ACPI_VIDEO_FIRST_LEVEL
; i
< device
->brightness
->count
; i
++) {
1404 l
= device
->brightness
->levels
[i
];
1409 if (l
< min_above
&& l
> level_current
)
1411 if (l
> max_below
&& l
< level_current
)
1416 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
:
1417 return (level_current
< max
) ? min_above
: min
;
1418 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
:
1419 return (level_current
< max
) ? min_above
: max
;
1420 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
:
1421 return (level_current
> min
) ? max_below
: min
;
1422 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
:
1423 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
:
1426 return level_current
;
1431 acpi_video_switch_brightness(struct work_struct
*work
)
1433 struct acpi_video_device
*device
= container_of(to_delayed_work(work
),
1434 struct acpi_video_device
, switch_brightness_work
);
1435 unsigned long long level_current
, level_next
;
1436 int event
= device
->switch_brightness_event
;
1437 int result
= -EINVAL
;
1439 /* no warning message if acpi_backlight=vendor or a quirk is used */
1440 if (!device
->backlight
)
1443 if (!device
->brightness
)
1446 result
= acpi_video_device_lcd_get_level_current(device
,
1452 level_next
= acpi_video_get_next_level(device
, level_current
, event
);
1454 result
= acpi_video_device_lcd_set_level(device
, level_next
);
1457 backlight_force_update(device
->backlight
,
1458 BACKLIGHT_UPDATE_HOTKEY
);
1462 printk(KERN_ERR PREFIX
"Failed to switch the brightness\n");
1465 int acpi_video_get_edid(struct acpi_device
*device
, int type
, int device_id
,
1468 struct acpi_video_bus
*video
;
1469 struct acpi_video_device
*video_device
;
1470 union acpi_object
*buffer
= NULL
;
1474 if (!device
|| !acpi_driver_data(device
))
1477 video
= acpi_driver_data(device
);
1479 for (i
= 0; i
< video
->attached_count
; i
++) {
1480 video_device
= video
->attached_array
[i
].bind_info
;
1486 if (!video_device
->cap
._DDC
)
1491 case ACPI_VIDEO_DISPLAY_CRT
:
1492 if (!video_device
->flags
.crt
)
1495 case ACPI_VIDEO_DISPLAY_TV
:
1496 if (!video_device
->flags
.tvout
)
1499 case ACPI_VIDEO_DISPLAY_DVI
:
1500 if (!video_device
->flags
.dvi
)
1503 case ACPI_VIDEO_DISPLAY_LCD
:
1504 if (!video_device
->flags
.lcd
)
1508 } else if (video_device
->device_id
!= device_id
) {
1512 status
= acpi_video_device_EDID(video_device
, &buffer
, length
);
1514 if (ACPI_FAILURE(status
) || !buffer
||
1515 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1517 status
= acpi_video_device_EDID(video_device
, &buffer
,
1519 if (ACPI_FAILURE(status
) || !buffer
||
1520 buffer
->type
!= ACPI_TYPE_BUFFER
) {
1525 *edid
= buffer
->buffer
.pointer
;
1531 EXPORT_SYMBOL(acpi_video_get_edid
);
1534 acpi_video_bus_get_devices(struct acpi_video_bus
*video
,
1535 struct acpi_device
*device
)
1538 struct acpi_device
*dev
;
1541 * There are systems where video module known to work fine regardless
1542 * of broken _DOD and ignoring returned value here doesn't cause
1545 acpi_video_device_enumerate(video
);
1547 list_for_each_entry(dev
, &device
->children
, node
) {
1549 status
= acpi_video_bus_get_one_device(dev
, video
);
1551 dev_err(&dev
->dev
, "Can't attach device\n");
1554 video
->child_count
++;
1559 /* acpi_video interface */
1562 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1563 * preform any automatic brightness change on receiving a notification.
1565 static int acpi_video_bus_start_devices(struct acpi_video_bus
*video
)
1567 return acpi_video_bus_DOS(video
, 0,
1568 acpi_osi_is_win8() ? 1 : 0);
1571 static int acpi_video_bus_stop_devices(struct acpi_video_bus
*video
)
1573 return acpi_video_bus_DOS(video
, 0,
1574 acpi_osi_is_win8() ? 0 : 1);
1577 static void acpi_video_bus_notify(struct acpi_device
*device
, u32 event
)
1579 struct acpi_video_bus
*video
= acpi_driver_data(device
);
1580 struct input_dev
*input
;
1583 if (!video
|| !video
->input
)
1586 input
= video
->input
;
1589 case ACPI_VIDEO_NOTIFY_SWITCH
: /* User requested a switch,
1590 * most likely via hotkey. */
1591 keycode
= KEY_SWITCHVIDEOMODE
;
1594 case ACPI_VIDEO_NOTIFY_PROBE
: /* User plugged in or removed a video
1596 acpi_video_device_enumerate(video
);
1597 acpi_video_device_rebind(video
);
1598 keycode
= KEY_SWITCHVIDEOMODE
;
1601 case ACPI_VIDEO_NOTIFY_CYCLE
: /* Cycle Display output hotkey pressed. */
1602 keycode
= KEY_SWITCHVIDEOMODE
;
1604 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT
: /* Next Display output hotkey pressed. */
1605 keycode
= KEY_VIDEO_NEXT
;
1607 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT
: /* previous Display output hotkey pressed. */
1608 keycode
= KEY_VIDEO_PREV
;
1612 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1613 "Unsupported event [0x%x]\n", event
));
1617 if (acpi_notifier_call_chain(device
, event
, 0))
1618 /* Something vetoed the keypress. */
1621 if (keycode
&& (report_key_events
& REPORT_OUTPUT_KEY_EVENTS
)) {
1622 input_report_key(input
, keycode
, 1);
1624 input_report_key(input
, keycode
, 0);
1631 static void brightness_switch_event(struct acpi_video_device
*video_device
,
1634 if (!brightness_switch_enabled
)
1637 video_device
->switch_brightness_event
= event
;
1638 schedule_delayed_work(&video_device
->switch_brightness_work
, HZ
/ 10);
1641 static void acpi_video_device_notify(acpi_handle handle
, u32 event
, void *data
)
1643 struct acpi_video_device
*video_device
= data
;
1644 struct acpi_device
*device
= NULL
;
1645 struct acpi_video_bus
*bus
;
1646 struct input_dev
*input
;
1652 device
= video_device
->dev
;
1653 bus
= video_device
->video
;
1656 if (hw_changes_brightness
> 0) {
1657 if (video_device
->backlight
)
1658 backlight_force_update(video_device
->backlight
,
1659 BACKLIGHT_UPDATE_HOTKEY
);
1660 acpi_notifier_call_chain(device
, event
, 0);
1665 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS
: /* Cycle brightness */
1666 brightness_switch_event(video_device
, event
);
1667 keycode
= KEY_BRIGHTNESS_CYCLE
;
1669 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS
: /* Increase brightness */
1670 brightness_switch_event(video_device
, event
);
1671 keycode
= KEY_BRIGHTNESSUP
;
1673 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS
: /* Decrease brightness */
1674 brightness_switch_event(video_device
, event
);
1675 keycode
= KEY_BRIGHTNESSDOWN
;
1677 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS
: /* zero brightness */
1678 brightness_switch_event(video_device
, event
);
1679 keycode
= KEY_BRIGHTNESS_ZERO
;
1681 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF
: /* display device off */
1682 brightness_switch_event(video_device
, event
);
1683 keycode
= KEY_DISPLAY_OFF
;
1686 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1687 "Unsupported event [0x%x]\n", event
));
1691 acpi_notifier_call_chain(device
, event
, 0);
1693 if (keycode
&& (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
)) {
1694 input_report_key(input
, keycode
, 1);
1696 input_report_key(input
, keycode
, 0);
1703 static int acpi_video_resume(struct notifier_block
*nb
,
1704 unsigned long val
, void *ign
)
1706 struct acpi_video_bus
*video
;
1707 struct acpi_video_device
*video_device
;
1711 case PM_HIBERNATION_PREPARE
:
1712 case PM_SUSPEND_PREPARE
:
1713 case PM_RESTORE_PREPARE
:
1717 video
= container_of(nb
, struct acpi_video_bus
, pm_nb
);
1719 dev_info(&video
->device
->dev
, "Restoring backlight state\n");
1721 for (i
= 0; i
< video
->attached_count
; i
++) {
1722 video_device
= video
->attached_array
[i
].bind_info
;
1723 if (video_device
&& video_device
->brightness
)
1724 acpi_video_device_lcd_set_level(video_device
,
1725 video_device
->brightness
->curr
);
1732 acpi_video_bus_match(acpi_handle handle
, u32 level
, void *context
,
1733 void **return_value
)
1735 struct acpi_device
*device
= context
;
1736 struct acpi_device
*sibling
;
1739 if (handle
== device
->handle
)
1740 return AE_CTRL_TERMINATE
;
1742 result
= acpi_bus_get_device(handle
, &sibling
);
1746 if (!strcmp(acpi_device_name(sibling
), ACPI_VIDEO_BUS_NAME
))
1747 return AE_ALREADY_EXISTS
;
1752 static void acpi_video_dev_register_backlight(struct acpi_video_device
*device
)
1754 struct backlight_properties props
;
1755 struct pci_dev
*pdev
;
1756 acpi_handle acpi_parent
;
1757 struct device
*parent
= NULL
;
1762 result
= acpi_video_init_brightness(device
);
1766 if (disable_backlight_sysfs_if
> 0)
1769 name
= kasprintf(GFP_KERNEL
, "acpi_video%d", count
);
1774 acpi_get_parent(device
->dev
->handle
, &acpi_parent
);
1776 pdev
= acpi_get_pci_dev(acpi_parent
);
1778 parent
= &pdev
->dev
;
1782 memset(&props
, 0, sizeof(struct backlight_properties
));
1783 props
.type
= BACKLIGHT_FIRMWARE
;
1784 props
.max_brightness
=
1785 device
->brightness
->count
- ACPI_VIDEO_FIRST_LEVEL
- 1;
1786 device
->backlight
= backlight_device_register(name
,
1789 &acpi_backlight_ops
,
1792 if (IS_ERR(device
->backlight
)) {
1793 device
->backlight
= NULL
;
1798 * Save current brightness level in case we have to restore it
1799 * before acpi_video_device_lcd_set_level() is called next time.
1801 device
->backlight
->props
.brightness
=
1802 acpi_video_get_brightness(device
->backlight
);
1804 device
->cooling_dev
= thermal_cooling_device_register("LCD",
1805 device
->dev
, &video_cooling_ops
);
1806 if (IS_ERR(device
->cooling_dev
)) {
1808 * Set cooling_dev to NULL so we don't crash trying to free it.
1809 * Also, why the hell we are returning early and not attempt to
1810 * register video output if cooling device registration failed?
1813 device
->cooling_dev
= NULL
;
1817 dev_info(&device
->dev
->dev
, "registered as cooling_device%d\n",
1818 device
->cooling_dev
->id
);
1819 result
= sysfs_create_link(&device
->dev
->dev
.kobj
,
1820 &device
->cooling_dev
->device
.kobj
,
1823 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1824 result
= sysfs_create_link(&device
->cooling_dev
->device
.kobj
,
1825 &device
->dev
->dev
.kobj
, "device");
1827 printk(KERN_ERR PREFIX
"Create sysfs link\n");
1830 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus
*video
)
1832 struct acpi_video_device
*dev
;
1833 union acpi_object
*levels
;
1835 mutex_lock(&video
->device_list_lock
);
1836 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1837 if (!acpi_video_device_lcd_query_levels(dev
->dev
->handle
, &levels
))
1840 mutex_unlock(&video
->device_list_lock
);
1843 static bool acpi_video_should_register_backlight(struct acpi_video_device
*dev
)
1846 * Do not create backlight device for video output
1847 * device that is not in the enumerated list.
1849 if (!acpi_video_device_in_dod(dev
)) {
1850 dev_dbg(&dev
->dev
->dev
, "not in _DOD list, ignore\n");
1855 return dev
->flags
.lcd
;
1859 static int acpi_video_bus_register_backlight(struct acpi_video_bus
*video
)
1861 struct acpi_video_device
*dev
;
1863 if (video
->backlight_registered
)
1866 acpi_video_run_bcl_for_osi(video
);
1868 if (acpi_video_get_backlight_type() != acpi_backlight_video
)
1871 mutex_lock(&video
->device_list_lock
);
1872 list_for_each_entry(dev
, &video
->video_device_list
, entry
) {
1873 if (acpi_video_should_register_backlight(dev
))
1874 acpi_video_dev_register_backlight(dev
);
1876 mutex_unlock(&video
->device_list_lock
);
1878 video
->backlight_registered
= true;
1880 video
->pm_nb
.notifier_call
= acpi_video_resume
;
1881 video
->pm_nb
.priority
= 0;
1882 return register_pm_notifier(&video
->pm_nb
);
1885 static void acpi_video_dev_unregister_backlight(struct acpi_video_device
*device
)
1887 if (device
->backlight
) {
1888 backlight_device_unregister(device
->backlight
);
1889 device
->backlight
= NULL
;
1891 if (device
->brightness
) {
1892 kfree(device
->brightness
->levels
);
1893 kfree(device
->brightness
);
1894 device
->brightness
= NULL
;
1896 if (device
->cooling_dev
) {
1897 sysfs_remove_link(&device
->dev
->dev
.kobj
, "thermal_cooling");
1898 sysfs_remove_link(&device
->cooling_dev
->device
.kobj
, "device");
1899 thermal_cooling_device_unregister(device
->cooling_dev
);
1900 device
->cooling_dev
= NULL
;
1904 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus
*video
)
1906 struct acpi_video_device
*dev
;
1909 if (!video
->backlight_registered
)
1912 error
= unregister_pm_notifier(&video
->pm_nb
);
1914 mutex_lock(&video
->device_list_lock
);
1915 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1916 acpi_video_dev_unregister_backlight(dev
);
1917 mutex_unlock(&video
->device_list_lock
);
1919 video
->backlight_registered
= false;
1924 static void acpi_video_dev_add_notify_handler(struct acpi_video_device
*device
)
1927 struct acpi_device
*adev
= device
->dev
;
1929 status
= acpi_install_notify_handler(adev
->handle
, ACPI_DEVICE_NOTIFY
,
1930 acpi_video_device_notify
, device
);
1931 if (ACPI_FAILURE(status
))
1932 dev_err(&adev
->dev
, "Error installing notify handler\n");
1934 device
->flags
.notify
= 1;
1937 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus
*video
)
1939 struct input_dev
*input
;
1940 struct acpi_video_device
*dev
;
1943 video
->input
= input
= input_allocate_device();
1949 error
= acpi_video_bus_start_devices(video
);
1951 goto err_free_input
;
1953 snprintf(video
->phys
, sizeof(video
->phys
),
1954 "%s/video/input0", acpi_device_hid(video
->device
));
1956 input
->name
= acpi_device_name(video
->device
);
1957 input
->phys
= video
->phys
;
1958 input
->id
.bustype
= BUS_HOST
;
1959 input
->id
.product
= 0x06;
1960 input
->dev
.parent
= &video
->device
->dev
;
1961 input
->evbit
[0] = BIT(EV_KEY
);
1962 set_bit(KEY_SWITCHVIDEOMODE
, input
->keybit
);
1963 set_bit(KEY_VIDEO_NEXT
, input
->keybit
);
1964 set_bit(KEY_VIDEO_PREV
, input
->keybit
);
1965 set_bit(KEY_BRIGHTNESS_CYCLE
, input
->keybit
);
1966 set_bit(KEY_BRIGHTNESSUP
, input
->keybit
);
1967 set_bit(KEY_BRIGHTNESSDOWN
, input
->keybit
);
1968 set_bit(KEY_BRIGHTNESS_ZERO
, input
->keybit
);
1969 set_bit(KEY_DISPLAY_OFF
, input
->keybit
);
1971 error
= input_register_device(input
);
1975 mutex_lock(&video
->device_list_lock
);
1976 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
1977 acpi_video_dev_add_notify_handler(dev
);
1978 mutex_unlock(&video
->device_list_lock
);
1983 acpi_video_bus_stop_devices(video
);
1985 input_free_device(input
);
1986 video
->input
= NULL
;
1991 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device
*dev
)
1993 if (dev
->flags
.notify
) {
1994 acpi_remove_notify_handler(dev
->dev
->handle
, ACPI_DEVICE_NOTIFY
,
1995 acpi_video_device_notify
);
1996 dev
->flags
.notify
= 0;
2000 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus
*video
)
2002 struct acpi_video_device
*dev
;
2004 mutex_lock(&video
->device_list_lock
);
2005 list_for_each_entry(dev
, &video
->video_device_list
, entry
)
2006 acpi_video_dev_remove_notify_handler(dev
);
2007 mutex_unlock(&video
->device_list_lock
);
2009 acpi_video_bus_stop_devices(video
);
2010 input_unregister_device(video
->input
);
2011 video
->input
= NULL
;
2014 static int acpi_video_bus_put_devices(struct acpi_video_bus
*video
)
2016 struct acpi_video_device
*dev
, *next
;
2018 mutex_lock(&video
->device_list_lock
);
2019 list_for_each_entry_safe(dev
, next
, &video
->video_device_list
, entry
) {
2020 list_del(&dev
->entry
);
2023 mutex_unlock(&video
->device_list_lock
);
2028 static int instance
;
2030 static int acpi_video_bus_add(struct acpi_device
*device
)
2032 struct acpi_video_bus
*video
;
2036 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
,
2037 device
->parent
->handle
, 1,
2038 acpi_video_bus_match
, NULL
,
2040 if (status
== AE_ALREADY_EXISTS
) {
2041 printk(KERN_WARNING FW_BUG
2042 "Duplicate ACPI video bus devices for the"
2043 " same VGA controller, please try module "
2044 "parameter \"video.allow_duplicates=1\""
2045 "if the current driver doesn't work.\n");
2046 if (!allow_duplicates
)
2050 video
= kzalloc(sizeof(struct acpi_video_bus
), GFP_KERNEL
);
2054 /* a hack to fix the duplicate name "VID" problem on T61 */
2055 if (!strcmp(device
->pnp
.bus_id
, "VID")) {
2057 device
->pnp
.bus_id
[3] = '0' + instance
;
2060 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2061 if (!strcmp(device
->pnp
.bus_id
, "VGA")) {
2063 device
->pnp
.bus_id
[3] = '0' + instance
;
2067 video
->device
= device
;
2068 strcpy(acpi_device_name(device
), ACPI_VIDEO_BUS_NAME
);
2069 strcpy(acpi_device_class(device
), ACPI_VIDEO_CLASS
);
2070 device
->driver_data
= video
;
2072 acpi_video_bus_find_cap(video
);
2073 error
= acpi_video_bus_check(video
);
2075 goto err_free_video
;
2077 mutex_init(&video
->device_list_lock
);
2078 INIT_LIST_HEAD(&video
->video_device_list
);
2080 error
= acpi_video_bus_get_devices(video
, device
);
2084 printk(KERN_INFO PREFIX
"%s [%s] (multi-head: %s rom: %s post: %s)\n",
2085 ACPI_VIDEO_DEVICE_NAME
, acpi_device_bid(device
),
2086 video
->flags
.multihead
? "yes" : "no",
2087 video
->flags
.rom
? "yes" : "no",
2088 video
->flags
.post
? "yes" : "no");
2089 mutex_lock(&video_list_lock
);
2090 list_add_tail(&video
->entry
, &video_bus_head
);
2091 mutex_unlock(&video_list_lock
);
2093 acpi_video_bus_register_backlight(video
);
2094 acpi_video_bus_add_notify_handler(video
);
2099 acpi_video_bus_put_devices(video
);
2100 kfree(video
->attached_array
);
2103 device
->driver_data
= NULL
;
2108 static int acpi_video_bus_remove(struct acpi_device
*device
)
2110 struct acpi_video_bus
*video
= NULL
;
2113 if (!device
|| !acpi_driver_data(device
))
2116 video
= acpi_driver_data(device
);
2118 acpi_video_bus_remove_notify_handler(video
);
2119 acpi_video_bus_unregister_backlight(video
);
2120 acpi_video_bus_put_devices(video
);
2122 mutex_lock(&video_list_lock
);
2123 list_del(&video
->entry
);
2124 mutex_unlock(&video_list_lock
);
2126 kfree(video
->attached_array
);
2132 static int __init
is_i740(struct pci_dev
*dev
)
2134 if (dev
->device
== 0x00D1)
2136 if (dev
->device
== 0x7000)
2141 static int __init
intel_opregion_present(void)
2144 struct pci_dev
*dev
= NULL
;
2147 for_each_pci_dev(dev
) {
2148 if ((dev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
2150 if (dev
->vendor
!= PCI_VENDOR_ID_INTEL
)
2152 /* We don't want to poke around undefined i740 registers */
2155 pci_read_config_dword(dev
, 0xfc, &address
);
2163 /* Check if the chassis-type indicates there is no builtin LCD panel */
2164 static bool dmi_is_desktop(void)
2166 const char *chassis_type
;
2169 chassis_type
= dmi_get_system_info(DMI_CHASSIS_TYPE
);
2173 if (kstrtoul(chassis_type
, 10, &type
) != 0)
2177 case 0x03: /* Desktop */
2178 case 0x04: /* Low Profile Desktop */
2179 case 0x05: /* Pizza Box */
2180 case 0x06: /* Mini Tower */
2181 case 0x07: /* Tower */
2182 case 0x10: /* Lunch Box */
2183 case 0x11: /* Main Server Chassis */
2190 int acpi_video_register(void)
2194 mutex_lock(®ister_count_mutex
);
2195 if (register_count
) {
2197 * if the function of acpi_video_register is already called,
2198 * don't register the acpi_vide_bus again and return no error.
2204 * We're seeing a lot of bogus backlight interfaces on newer machines
2205 * without a LCD such as desktops, servers and HDMI sticks. Checking
2206 * the lcd flag fixes this, so enable this on any machines which are
2207 * win8 ready (where we also prefer the native backlight driver, so
2208 * normally the acpi_video code should not register there anyways).
2210 if (only_lcd
== -1) {
2211 if (dmi_is_desktop() && acpi_osi_is_win8())
2217 dmi_check_system(video_dmi_table
);
2219 ret
= acpi_bus_register_driver(&acpi_video_bus
);
2224 * When the acpi_video_bus is loaded successfully, increase
2225 * the counter reference.
2230 mutex_unlock(®ister_count_mutex
);
2233 EXPORT_SYMBOL(acpi_video_register
);
2235 void acpi_video_unregister(void)
2237 mutex_lock(®ister_count_mutex
);
2238 if (register_count
) {
2239 acpi_bus_unregister_driver(&acpi_video_bus
);
2242 mutex_unlock(®ister_count_mutex
);
2244 EXPORT_SYMBOL(acpi_video_unregister
);
2246 void acpi_video_unregister_backlight(void)
2248 struct acpi_video_bus
*video
;
2250 mutex_lock(®ister_count_mutex
);
2251 if (register_count
) {
2252 mutex_lock(&video_list_lock
);
2253 list_for_each_entry(video
, &video_bus_head
, entry
)
2254 acpi_video_bus_unregister_backlight(video
);
2255 mutex_unlock(&video_list_lock
);
2257 mutex_unlock(®ister_count_mutex
);
2260 bool acpi_video_handles_brightness_key_presses(void)
2262 bool have_video_busses
;
2264 mutex_lock(&video_list_lock
);
2265 have_video_busses
= !list_empty(&video_bus_head
);
2266 mutex_unlock(&video_list_lock
);
2268 return have_video_busses
&&
2269 (report_key_events
& REPORT_BRIGHTNESS_KEY_EVENTS
);
2271 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses
);
2274 * This is kind of nasty. Hardware using Intel chipsets may require
2275 * the video opregion code to be run first in order to initialise
2276 * state before any ACPI video calls are made. To handle this we defer
2277 * registration of the video class until the opregion code has run.
2280 static int __init
acpi_video_init(void)
2283 * Let the module load even if ACPI is disabled (e.g. due to
2284 * a broken BIOS) so that i915.ko can still be loaded on such
2285 * old systems without an AcpiOpRegion.
2287 * acpi_video_register() will report -ENODEV later as well due
2288 * to acpi_disabled when i915.ko tries to register itself afterwards.
2293 if (intel_opregion_present())
2296 return acpi_video_register();
2299 static void __exit
acpi_video_exit(void)
2301 acpi_video_detect_exit();
2302 acpi_video_unregister();
2307 module_init(acpi_video_init
);
2308 module_exit(acpi_video_exit
);