2 * video.c - ACPI Video Driver
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
85 static int use_native_backlight_param = 1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = false;
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
96 static const struct acpi_device_id video_device_ids[] = {
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
102 static struct acpi_driver acpi_video_bus = {
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
143 struct acpi_video_enumerated_device {
146 struct acpi_video_device_attrib attrib;
148 struct acpi_video_device *bind_info;
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 bool backlight_registered;
154 bool backlight_notifier_registered;
156 struct acpi_video_enumerated_device *attached_array;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 struct notifier_block backlight_nb;
169 struct acpi_video_device_flags {
180 struct acpi_video_device_cap {
181 u8 _ADR:1; /* Return the unique ID */
182 u8 _BCL:1; /* Query list of brightness control levels supported */
183 u8 _BCM:1; /* Set the brightness level */
184 u8 _BQC:1; /* Get current brightness level */
185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
186 u8 _DDC:1; /* Return the EDID for this device */
189 struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
195 struct acpi_video_device_brightness {
199 struct acpi_video_brightness_flags flags;
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
214 static const char device_decode[][30] = {
215 "motherboard VGA device",
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
230 unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
233 static int acpi_video_switch_brightness(struct acpi_video_device *device,
236 static bool acpi_video_use_native_backlight(void)
238 if (use_native_backlight_param != -1)
239 return use_native_backlight_param;
241 return use_native_backlight_dmi;
244 bool acpi_video_verify_backlight_support(void)
246 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
247 backlight_device_registered(BACKLIGHT_RAW))
249 return acpi_video_backlight_support();
251 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
253 /* backlight device sysfs support */
254 static int acpi_video_get_brightness(struct backlight_device *bd)
256 unsigned long long cur_level;
258 struct acpi_video_device *vd = bl_get_data(bd);
260 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
262 for (i = 2; i < vd->brightness->count; i++) {
263 if (vd->brightness->levels[i] == cur_level)
265 * The first two entries are special - see page 575
266 * of the ACPI spec 3.0
273 static int acpi_video_set_brightness(struct backlight_device *bd)
275 int request_level = bd->props.brightness + 2;
276 struct acpi_video_device *vd = bl_get_data(bd);
278 return acpi_video_device_lcd_set_level(vd,
279 vd->brightness->levels[request_level]);
282 static const struct backlight_ops acpi_backlight_ops = {
283 .get_brightness = acpi_video_get_brightness,
284 .update_status = acpi_video_set_brightness,
287 /* thermal cooling device callbacks */
288 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
294 *state = video->brightness->count - 3;
298 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
301 struct acpi_device *device = cooling_dev->devdata;
302 struct acpi_video_device *video = acpi_driver_data(device);
303 unsigned long long level;
306 if (acpi_video_device_lcd_get_level_current(video, &level, false))
308 for (offset = 2; offset < video->brightness->count; offset++)
309 if (level == video->brightness->levels[offset]) {
310 *state = video->brightness->count - offset - 1;
318 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
320 struct acpi_device *device = cooling_dev->devdata;
321 struct acpi_video_device *video = acpi_driver_data(device);
324 if (state >= video->brightness->count - 2)
327 state = video->brightness->count - state;
328 level = video->brightness->levels[state - 1];
329 return acpi_video_device_lcd_set_level(video, level);
332 static const struct thermal_cooling_device_ops video_cooling_ops = {
333 .get_max_state = video_get_max_state,
334 .get_cur_state = video_get_cur_state,
335 .set_cur_state = video_set_cur_state,
339 * --------------------------------------------------------------------------
341 * --------------------------------------------------------------------------
345 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
346 union acpi_object **levels)
349 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
350 union acpi_object *obj;
355 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
356 if (!ACPI_SUCCESS(status))
358 obj = (union acpi_object *)buffer.pointer;
359 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
360 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
370 kfree(buffer.pointer);
376 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
381 status = acpi_execute_simple_method(device->dev->handle,
383 if (ACPI_FAILURE(status)) {
384 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
388 device->brightness->curr = level;
389 for (state = 2; state < device->brightness->count; state++)
390 if (level == device->brightness->levels[state]) {
391 if (device->backlight)
392 device->backlight->props.brightness = state - 2;
396 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
401 * For some buggy _BQC methods, we need to add a constant value to
402 * the _BQC return value to get the actual current brightness level
405 static int bqc_offset_aml_bug_workaround;
406 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
408 bqc_offset_aml_bug_workaround = 9;
412 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
414 use_native_backlight_dmi = true;
418 static struct dmi_system_id video_dmi_table[] __initdata = {
420 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
423 .callback = video_set_bqc_offset,
424 .ident = "Acer Aspire 5720",
426 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5710Z",
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
439 .callback = video_set_bqc_offset,
440 .ident = "eMachines E510",
442 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
447 .callback = video_set_bqc_offset,
448 .ident = "Acer Aspire 5315",
450 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
451 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
455 .callback = video_set_bqc_offset,
456 .ident = "Acer Aspire 7720",
458 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
463 .callback = video_set_use_native_backlight,
464 .ident = "ThinkPad T430 and T430s",
466 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
467 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
471 .callback = video_set_use_native_backlight,
472 .ident = "ThinkPad X230",
474 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
475 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
479 .callback = video_set_use_native_backlight,
480 .ident = "ThinkPad W530",
482 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
483 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
487 .callback = video_set_use_native_backlight,
488 .ident = "ThinkPad X1 Carbon",
490 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
495 .callback = video_set_use_native_backlight,
496 .ident = "Lenovo Yoga 13",
498 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
503 .callback = video_set_use_native_backlight,
504 .ident = "Lenovo Yoga 2 11",
506 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
511 .callback = video_set_use_native_backlight,
512 .ident = "Thinkpad Helix",
514 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
519 .callback = video_set_use_native_backlight,
520 .ident = "Dell Inspiron 7520",
522 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
523 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
527 .callback = video_set_use_native_backlight,
528 .ident = "Acer Aspire 5733Z",
530 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
531 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
535 .callback = video_set_use_native_backlight,
536 .ident = "Acer Aspire 5742G",
538 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
539 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
543 .callback = video_set_use_native_backlight,
544 .ident = "Acer Aspire V5-171",
546 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
547 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
551 .callback = video_set_use_native_backlight,
552 .ident = "Acer Aspire V5-431",
554 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
555 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
559 .callback = video_set_use_native_backlight,
560 .ident = "Acer Aspire V5-471G",
562 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
567 .callback = video_set_use_native_backlight,
568 .ident = "Acer TravelMate B113",
570 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
571 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
575 .callback = video_set_use_native_backlight,
576 .ident = "HP ProBook 4340s",
578 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
579 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
583 .callback = video_set_use_native_backlight,
584 .ident = "HP ProBook 4540s",
586 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
587 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
591 .callback = video_set_use_native_backlight,
592 .ident = "HP ProBook 2013 models",
594 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
596 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
600 .callback = video_set_use_native_backlight,
601 .ident = "HP EliteBook 2013 models",
603 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
604 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
605 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
609 .callback = video_set_use_native_backlight,
610 .ident = "HP ZBook 14",
612 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
617 .callback = video_set_use_native_backlight,
618 .ident = "HP ZBook 15",
620 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
621 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
625 .callback = video_set_use_native_backlight,
626 .ident = "HP ZBook 17",
628 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
629 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
633 .callback = video_set_use_native_backlight,
634 .ident = "HP EliteBook 8470p",
636 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
637 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
641 .callback = video_set_use_native_backlight,
642 .ident = "HP EliteBook 8780w",
644 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
645 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
651 static unsigned long long
652 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
653 unsigned long long bqc_value)
655 unsigned long long level;
657 if (device->brightness->flags._BQC_use_index) {
659 * _BQC returns an index that doesn't account for
660 * the first 2 items with special meaning, so we need
661 * to compensate for that by offsetting ourselves
663 if (device->brightness->flags._BCL_reversed)
664 bqc_value = device->brightness->count - 3 - bqc_value;
666 level = device->brightness->levels[bqc_value + 2];
671 level += bqc_offset_aml_bug_workaround;
677 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
678 unsigned long long *level, bool raw)
680 acpi_status status = AE_OK;
683 if (device->cap._BQC || device->cap._BCQ) {
684 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
686 status = acpi_evaluate_integer(device->dev->handle, buf,
688 if (ACPI_SUCCESS(status)) {
691 * Caller has indicated he wants the raw
692 * value returned by _BQC, so don't furtherly
693 * mess with the value.
698 *level = acpi_video_bqc_value_to_level(device, *level);
700 for (i = 2; i < device->brightness->count; i++)
701 if (device->brightness->levels[i] == *level) {
702 device->brightness->curr = *level;
706 * BQC returned an invalid level.
709 ACPI_WARNING((AE_INFO,
710 "%s returned an invalid level",
712 device->cap._BQC = device->cap._BCQ = 0;
716 * should we return an error or ignore this failure?
717 * dev->brightness->curr is a cached value which stores
718 * the correct current backlight level in most cases.
719 * ACPI video backlight still works w/ buggy _BQC.
720 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
722 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
723 device->cap._BQC = device->cap._BCQ = 0;
727 *level = device->brightness->curr;
732 acpi_video_device_EDID(struct acpi_video_device *device,
733 union acpi_object **edid, ssize_t length)
736 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
737 union acpi_object *obj;
738 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
739 struct acpi_object_list args = { 1, &arg0 };
747 arg0.integer.value = 1;
748 else if (length == 256)
749 arg0.integer.value = 2;
753 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
754 if (ACPI_FAILURE(status))
757 obj = buffer.pointer;
759 if (obj && obj->type == ACPI_TYPE_BUFFER)
762 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
774 * video : video bus device pointer
776 * 0. The system BIOS should NOT automatically switch(toggle)
777 * the active display output.
778 * 1. The system BIOS should automatically switch (toggle) the
779 * active display output. No switch event.
780 * 2. The _DGS value should be locked.
781 * 3. The system BIOS should not automatically switch (toggle) the
782 * active display output, but instead generate the display switch
785 * 0. The system BIOS should automatically control the brightness level
786 * of the LCD when the power changes from AC to DC
787 * 1. The system BIOS should NOT automatically control the brightness
788 * level of the LCD when the power changes from AC to DC.
794 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
798 if (!video->cap._DOS)
801 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
803 video->dos_setting = (lcd_flag << 2) | bios_flag;
804 status = acpi_execute_simple_method(video->device->handle, "_DOS",
805 (lcd_flag << 2) | bios_flag);
806 if (ACPI_FAILURE(status))
813 * Simple comparison function used to sort backlight levels.
817 acpi_video_cmp_level(const void *a, const void *b)
819 return *(int *)a - *(int *)b;
823 * Decides if _BQC/_BCQ for this system is usable
825 * We do this by changing the level first and then read out the current
826 * brightness level, if the value does not match, find out if it is using
827 * index. If not, clear the _BQC/_BCQ capability.
829 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
830 int max_level, int current_level)
832 struct acpi_video_device_brightness *br = device->brightness;
834 unsigned long long level;
837 /* don't mess with existing known broken systems */
838 if (bqc_offset_aml_bug_workaround)
842 * Some systems always report current brightness level as maximum
843 * through _BQC, we need to test another value for them.
845 test_level = current_level == max_level ? br->levels[3] : max_level;
847 result = acpi_video_device_lcd_set_level(device, test_level);
851 result = acpi_video_device_lcd_get_level_current(device, &level, true);
855 if (level != test_level) {
856 /* buggy _BQC found, need to find out if it uses index */
857 if (level < br->count) {
858 if (br->flags._BCL_reversed)
859 level = br->count - 3 - level;
860 if (br->levels[level + 2] == test_level)
861 br->flags._BQC_use_index = 1;
864 if (!br->flags._BQC_use_index)
865 device->cap._BQC = device->cap._BCQ = 0;
874 * device : video output device (LCD, CRT, ..)
877 * Maximum brightness level
879 * Allocate and initialize device->brightness.
883 acpi_video_init_brightness(struct acpi_video_device *device)
885 union acpi_object *obj = NULL;
886 int i, max_level = 0, count = 0, level_ac_battery = 0;
887 unsigned long long level, level_old;
888 union acpi_object *o;
889 struct acpi_video_device_brightness *br = NULL;
890 int result = -EINVAL;
893 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
894 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
895 "LCD brightness level\n"));
899 if (obj->package.count < 2)
902 br = kzalloc(sizeof(*br), GFP_KERNEL);
904 printk(KERN_ERR "can't allocate memory\n");
909 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
916 for (i = 0; i < obj->package.count; i++) {
917 o = (union acpi_object *)&obj->package.elements[i];
918 if (o->type != ACPI_TYPE_INTEGER) {
919 printk(KERN_ERR PREFIX "Invalid data\n");
922 value = (u32) o->integer.value;
923 /* Skip duplicate entries */
924 if (count > 2 && br->levels[count - 1] == value)
927 br->levels[count] = value;
929 if (br->levels[count] > max_level)
930 max_level = br->levels[count];
935 * some buggy BIOS don't export the levels
936 * when machine is on AC/Battery in _BCL package.
937 * In this case, the first two elements in _BCL packages
938 * are also supported brightness levels that OS should take care of.
940 for (i = 2; i < count; i++) {
941 if (br->levels[i] == br->levels[0])
943 if (br->levels[i] == br->levels[1])
947 if (level_ac_battery < 2) {
948 level_ac_battery = 2 - level_ac_battery;
949 br->flags._BCL_no_ac_battery_levels = 1;
950 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
951 br->levels[i] = br->levels[i - level_ac_battery];
952 count += level_ac_battery;
953 } else if (level_ac_battery > 2)
954 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
956 /* Check if the _BCL package is in a reversed order */
957 if (max_level == br->levels[2]) {
958 br->flags._BCL_reversed = 1;
959 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
960 acpi_video_cmp_level, NULL);
961 } else if (max_level != br->levels[count - 1])
963 "Found unordered _BCL package"));
966 device->brightness = br;
968 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
969 br->curr = level = max_level;
971 if (!device->cap._BQC)
974 result = acpi_video_device_lcd_get_level_current(device,
977 goto out_free_levels;
979 result = acpi_video_bqc_quirk(device, max_level, level_old);
981 goto out_free_levels;
983 * cap._BQC may get cleared due to _BQC is found to be broken
984 * in acpi_video_bqc_quirk, so check again here.
986 if (!device->cap._BQC)
989 level = acpi_video_bqc_value_to_level(device, level_old);
991 * On some buggy laptops, _BQC returns an uninitialized
992 * value when invoked for the first time, i.e.
993 * level_old is invalid (no matter whether it's a level
994 * or an index). Set the backlight to max_level in this case.
996 for (i = 2; i < br->count; i++)
997 if (level == br->levels[i])
999 if (i == br->count || !level)
1003 result = acpi_video_device_lcd_set_level(device, level);
1005 goto out_free_levels;
1007 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1008 "found %d brightness levels\n", count - 2));
1017 device->brightness = NULL;
1024 * device : video output device (LCD, CRT, ..)
1029 * Find out all required AML methods defined under the output
1033 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1035 if (acpi_has_method(device->dev->handle, "_ADR"))
1036 device->cap._ADR = 1;
1037 if (acpi_has_method(device->dev->handle, "_BCL"))
1038 device->cap._BCL = 1;
1039 if (acpi_has_method(device->dev->handle, "_BCM"))
1040 device->cap._BCM = 1;
1041 if (acpi_has_method(device->dev->handle, "_BQC")) {
1042 device->cap._BQC = 1;
1043 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1044 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1045 device->cap._BCQ = 1;
1048 if (acpi_has_method(device->dev->handle, "_DDC"))
1049 device->cap._DDC = 1;
1054 * device : video output device (VGA)
1059 * Find out all required AML methods defined under the video bus device.
1062 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1064 if (acpi_has_method(video->device->handle, "_DOS"))
1065 video->cap._DOS = 1;
1066 if (acpi_has_method(video->device->handle, "_DOD"))
1067 video->cap._DOD = 1;
1068 if (acpi_has_method(video->device->handle, "_ROM"))
1069 video->cap._ROM = 1;
1070 if (acpi_has_method(video->device->handle, "_GPD"))
1071 video->cap._GPD = 1;
1072 if (acpi_has_method(video->device->handle, "_SPD"))
1073 video->cap._SPD = 1;
1074 if (acpi_has_method(video->device->handle, "_VPO"))
1075 video->cap._VPO = 1;
1079 * Check whether the video bus device has required AML method to
1080 * support the desired features
1083 static int acpi_video_bus_check(struct acpi_video_bus *video)
1085 acpi_status status = -ENOENT;
1086 struct pci_dev *dev;
1091 dev = acpi_get_pci_dev(video->device->handle);
1097 * Since there is no HID, CID and so on for VGA driver, we have
1098 * to check well known required nodes.
1101 /* Does this device support video switching? */
1102 if (video->cap._DOS || video->cap._DOD) {
1103 if (!video->cap._DOS) {
1104 printk(KERN_WARNING FW_BUG
1105 "ACPI(%s) defines _DOD but not _DOS\n",
1106 acpi_device_bid(video->device));
1108 video->flags.multihead = 1;
1112 /* Does this device support retrieving a video ROM? */
1113 if (video->cap._ROM) {
1114 video->flags.rom = 1;
1118 /* Does this device support configuring which video device to POST? */
1119 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1120 video->flags.post = 1;
1128 * --------------------------------------------------------------------------
1130 * --------------------------------------------------------------------------
1133 /* device interface */
1134 static struct acpi_video_device_attrib *
1135 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1137 struct acpi_video_enumerated_device *ids;
1140 for (i = 0; i < video->attached_count; i++) {
1141 ids = &video->attached_array[i];
1142 if ((ids->value.int_val & 0xffff) == device_id)
1143 return &ids->value.attrib;
1150 acpi_video_get_device_type(struct acpi_video_bus *video,
1151 unsigned long device_id)
1153 struct acpi_video_enumerated_device *ids;
1156 for (i = 0; i < video->attached_count; i++) {
1157 ids = &video->attached_array[i];
1158 if ((ids->value.int_val & 0xffff) == device_id)
1159 return ids->value.int_val;
1166 acpi_video_bus_get_one_device(struct acpi_device *device,
1167 struct acpi_video_bus *video)
1169 unsigned long long device_id;
1170 int status, device_type;
1171 struct acpi_video_device *data;
1172 struct acpi_video_device_attrib *attribute;
1175 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1176 /* Some device omits _ADR, we skip them instead of fail */
1177 if (ACPI_FAILURE(status))
1180 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1184 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1185 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1186 device->driver_data = data;
1188 data->device_id = device_id;
1189 data->video = video;
1192 attribute = acpi_video_get_device_attr(video, device_id);
1194 if (attribute && attribute->device_id_scheme) {
1195 switch (attribute->display_type) {
1196 case ACPI_VIDEO_DISPLAY_CRT:
1197 data->flags.crt = 1;
1199 case ACPI_VIDEO_DISPLAY_TV:
1200 data->flags.tvout = 1;
1202 case ACPI_VIDEO_DISPLAY_DVI:
1203 data->flags.dvi = 1;
1205 case ACPI_VIDEO_DISPLAY_LCD:
1206 data->flags.lcd = 1;
1209 data->flags.unknown = 1;
1212 if (attribute->bios_can_detect)
1213 data->flags.bios = 1;
1215 /* Check for legacy IDs */
1216 device_type = acpi_video_get_device_type(video, device_id);
1217 /* Ignore bits 16 and 18-20 */
1218 switch (device_type & 0xffe2ffff) {
1219 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1220 data->flags.crt = 1;
1222 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1223 data->flags.lcd = 1;
1225 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1226 data->flags.tvout = 1;
1229 data->flags.unknown = 1;
1233 acpi_video_device_bind(video, data);
1234 acpi_video_device_find_cap(data);
1236 mutex_lock(&video->device_list_lock);
1237 list_add_tail(&data->entry, &video->video_device_list);
1238 mutex_unlock(&video->device_list_lock);
1245 * video : video bus device
1250 * Enumerate the video device list of the video bus,
1251 * bind the ids with the corresponding video devices
1252 * under the video bus.
1255 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1257 struct acpi_video_device *dev;
1259 mutex_lock(&video->device_list_lock);
1261 list_for_each_entry(dev, &video->video_device_list, entry)
1262 acpi_video_device_bind(video, dev);
1264 mutex_unlock(&video->device_list_lock);
1269 * video : video bus device
1270 * device : video output device under the video
1276 * Bind the ids with the corresponding video devices
1277 * under the video bus.
1281 acpi_video_device_bind(struct acpi_video_bus *video,
1282 struct acpi_video_device *device)
1284 struct acpi_video_enumerated_device *ids;
1287 for (i = 0; i < video->attached_count; i++) {
1288 ids = &video->attached_array[i];
1289 if (device->device_id == (ids->value.int_val & 0xffff)) {
1290 ids->bind_info = device;
1291 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1298 * video : video bus device
1303 * Call _DOD to enumerate all devices attached to display adapter
1307 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1312 struct acpi_video_enumerated_device *active_list;
1313 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1314 union acpi_object *dod = NULL;
1315 union acpi_object *obj;
1317 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1318 if (!ACPI_SUCCESS(status)) {
1319 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1323 dod = buffer.pointer;
1324 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1325 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1330 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1331 dod->package.count));
1333 active_list = kcalloc(1 + dod->package.count,
1334 sizeof(struct acpi_video_enumerated_device),
1342 for (i = 0; i < dod->package.count; i++) {
1343 obj = &dod->package.elements[i];
1345 if (obj->type != ACPI_TYPE_INTEGER) {
1346 printk(KERN_ERR PREFIX
1347 "Invalid _DOD data in element %d\n", i);
1351 active_list[count].value.int_val = obj->integer.value;
1352 active_list[count].bind_info = NULL;
1353 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1354 (int)obj->integer.value));
1358 kfree(video->attached_array);
1360 video->attached_array = active_list;
1361 video->attached_count = count;
1364 kfree(buffer.pointer);
1369 acpi_video_get_next_level(struct acpi_video_device *device,
1370 u32 level_current, u32 event)
1372 int min, max, min_above, max_below, i, l, delta = 255;
1373 max = max_below = 0;
1374 min = min_above = 255;
1375 /* Find closest level to level_current */
1376 for (i = 2; i < device->brightness->count; i++) {
1377 l = device->brightness->levels[i];
1378 if (abs(l - level_current) < abs(delta)) {
1379 delta = l - level_current;
1384 /* Ajust level_current to closest available level */
1385 level_current += delta;
1386 for (i = 2; i < device->brightness->count; i++) {
1387 l = device->brightness->levels[i];
1392 if (l < min_above && l > level_current)
1394 if (l > max_below && l < level_current)
1399 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1400 return (level_current < max) ? min_above : min;
1401 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1402 return (level_current < max) ? min_above : max;
1403 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1404 return (level_current > min) ? max_below : min;
1405 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1406 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1409 return level_current;
1414 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1416 unsigned long long level_current, level_next;
1417 int result = -EINVAL;
1419 /* no warning message if acpi_backlight=vendor or a quirk is used */
1420 if (!acpi_video_verify_backlight_support())
1423 if (!device->brightness)
1426 result = acpi_video_device_lcd_get_level_current(device,
1432 level_next = acpi_video_get_next_level(device, level_current, event);
1434 result = acpi_video_device_lcd_set_level(device, level_next);
1437 backlight_force_update(device->backlight,
1438 BACKLIGHT_UPDATE_HOTKEY);
1442 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1447 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1450 struct acpi_video_bus *video;
1451 struct acpi_video_device *video_device;
1452 union acpi_object *buffer = NULL;
1456 if (!device || !acpi_driver_data(device))
1459 video = acpi_driver_data(device);
1461 for (i = 0; i < video->attached_count; i++) {
1462 video_device = video->attached_array[i].bind_info;
1468 if (!video_device->cap._DDC)
1473 case ACPI_VIDEO_DISPLAY_CRT:
1474 if (!video_device->flags.crt)
1477 case ACPI_VIDEO_DISPLAY_TV:
1478 if (!video_device->flags.tvout)
1481 case ACPI_VIDEO_DISPLAY_DVI:
1482 if (!video_device->flags.dvi)
1485 case ACPI_VIDEO_DISPLAY_LCD:
1486 if (!video_device->flags.lcd)
1490 } else if (video_device->device_id != device_id) {
1494 status = acpi_video_device_EDID(video_device, &buffer, length);
1496 if (ACPI_FAILURE(status) || !buffer ||
1497 buffer->type != ACPI_TYPE_BUFFER) {
1499 status = acpi_video_device_EDID(video_device, &buffer,
1501 if (ACPI_FAILURE(status) || !buffer ||
1502 buffer->type != ACPI_TYPE_BUFFER) {
1507 *edid = buffer->buffer.pointer;
1513 EXPORT_SYMBOL(acpi_video_get_edid);
1516 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1517 struct acpi_device *device)
1520 struct acpi_device *dev;
1523 * There are systems where video module known to work fine regardless
1524 * of broken _DOD and ignoring returned value here doesn't cause
1527 acpi_video_device_enumerate(video);
1529 list_for_each_entry(dev, &device->children, node) {
1531 status = acpi_video_bus_get_one_device(dev, video);
1533 dev_err(&dev->dev, "Can't attach device\n");
1540 /* acpi_video interface */
1543 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1544 * preform any automatic brightness change on receiving a notification.
1546 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1548 return acpi_video_bus_DOS(video, 0,
1549 acpi_osi_is_win8() ? 1 : 0);
1552 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1554 return acpi_video_bus_DOS(video, 0,
1555 acpi_osi_is_win8() ? 0 : 1);
1558 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1560 struct acpi_video_bus *video = acpi_driver_data(device);
1561 struct input_dev *input;
1564 if (!video || !video->input)
1567 input = video->input;
1570 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1571 * most likely via hotkey. */
1572 keycode = KEY_SWITCHVIDEOMODE;
1575 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1577 acpi_video_device_enumerate(video);
1578 acpi_video_device_rebind(video);
1579 keycode = KEY_SWITCHVIDEOMODE;
1582 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1583 keycode = KEY_SWITCHVIDEOMODE;
1585 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1586 keycode = KEY_VIDEO_NEXT;
1588 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1589 keycode = KEY_VIDEO_PREV;
1593 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1594 "Unsupported event [0x%x]\n", event));
1598 if (acpi_notifier_call_chain(device, event, 0))
1599 /* Something vetoed the keypress. */
1603 input_report_key(input, keycode, 1);
1605 input_report_key(input, keycode, 0);
1612 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1614 struct acpi_video_device *video_device = data;
1615 struct acpi_device *device = NULL;
1616 struct acpi_video_bus *bus;
1617 struct input_dev *input;
1623 device = video_device->dev;
1624 bus = video_device->video;
1628 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1629 if (brightness_switch_enabled)
1630 acpi_video_switch_brightness(video_device, event);
1631 keycode = KEY_BRIGHTNESS_CYCLE;
1633 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1634 if (brightness_switch_enabled)
1635 acpi_video_switch_brightness(video_device, event);
1636 keycode = KEY_BRIGHTNESSUP;
1638 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1639 if (brightness_switch_enabled)
1640 acpi_video_switch_brightness(video_device, event);
1641 keycode = KEY_BRIGHTNESSDOWN;
1643 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1644 if (brightness_switch_enabled)
1645 acpi_video_switch_brightness(video_device, event);
1646 keycode = KEY_BRIGHTNESS_ZERO;
1648 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1649 if (brightness_switch_enabled)
1650 acpi_video_switch_brightness(video_device, event);
1651 keycode = KEY_DISPLAY_OFF;
1654 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1655 "Unsupported event [0x%x]\n", event));
1659 acpi_notifier_call_chain(device, event, 0);
1662 input_report_key(input, keycode, 1);
1664 input_report_key(input, keycode, 0);
1671 static int acpi_video_resume(struct notifier_block *nb,
1672 unsigned long val, void *ign)
1674 struct acpi_video_bus *video;
1675 struct acpi_video_device *video_device;
1679 case PM_HIBERNATION_PREPARE:
1680 case PM_SUSPEND_PREPARE:
1681 case PM_RESTORE_PREPARE:
1685 video = container_of(nb, struct acpi_video_bus, pm_nb);
1687 dev_info(&video->device->dev, "Restoring backlight state\n");
1689 for (i = 0; i < video->attached_count; i++) {
1690 video_device = video->attached_array[i].bind_info;
1691 if (video_device && video_device->backlight)
1692 acpi_video_set_brightness(video_device->backlight);
1699 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1700 void **return_value)
1702 struct acpi_device *device = context;
1703 struct acpi_device *sibling;
1706 if (handle == device->handle)
1707 return AE_CTRL_TERMINATE;
1709 result = acpi_bus_get_device(handle, &sibling);
1713 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1714 return AE_ALREADY_EXISTS;
1719 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1721 struct backlight_properties props;
1722 struct pci_dev *pdev;
1723 acpi_handle acpi_parent;
1724 struct device *parent = NULL;
1729 result = acpi_video_init_brightness(device);
1732 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1737 acpi_get_parent(device->dev->handle, &acpi_parent);
1739 pdev = acpi_get_pci_dev(acpi_parent);
1741 parent = &pdev->dev;
1745 memset(&props, 0, sizeof(struct backlight_properties));
1746 props.type = BACKLIGHT_FIRMWARE;
1747 props.max_brightness = device->brightness->count - 3;
1748 device->backlight = backlight_device_register(name,
1751 &acpi_backlight_ops,
1754 if (IS_ERR(device->backlight))
1758 * Save current brightness level in case we have to restore it
1759 * before acpi_video_device_lcd_set_level() is called next time.
1761 device->backlight->props.brightness =
1762 acpi_video_get_brightness(device->backlight);
1764 device->cooling_dev = thermal_cooling_device_register("LCD",
1765 device->dev, &video_cooling_ops);
1766 if (IS_ERR(device->cooling_dev)) {
1768 * Set cooling_dev to NULL so we don't crash trying to free it.
1769 * Also, why the hell we are returning early and not attempt to
1770 * register video output if cooling device registration failed?
1773 device->cooling_dev = NULL;
1777 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1778 device->cooling_dev->id);
1779 result = sysfs_create_link(&device->dev->dev.kobj,
1780 &device->cooling_dev->device.kobj,
1783 printk(KERN_ERR PREFIX "Create sysfs link\n");
1784 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1785 &device->dev->dev.kobj, "device");
1787 printk(KERN_ERR PREFIX "Create sysfs link\n");
1790 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1792 struct acpi_video_device *dev;
1794 if (video->backlight_registered)
1797 if (!acpi_video_verify_backlight_support())
1800 mutex_lock(&video->device_list_lock);
1801 list_for_each_entry(dev, &video->video_device_list, entry)
1802 acpi_video_dev_register_backlight(dev);
1803 mutex_unlock(&video->device_list_lock);
1805 video->backlight_registered = true;
1807 video->pm_nb.notifier_call = acpi_video_resume;
1808 video->pm_nb.priority = 0;
1809 return register_pm_notifier(&video->pm_nb);
1812 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1814 if (device->backlight) {
1815 backlight_device_unregister(device->backlight);
1816 device->backlight = NULL;
1818 if (device->brightness) {
1819 kfree(device->brightness->levels);
1820 kfree(device->brightness);
1821 device->brightness = NULL;
1823 if (device->cooling_dev) {
1824 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1825 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1826 thermal_cooling_device_unregister(device->cooling_dev);
1827 device->cooling_dev = NULL;
1831 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1833 struct acpi_video_device *dev;
1836 if (!video->backlight_registered)
1839 error = unregister_pm_notifier(&video->pm_nb);
1841 mutex_lock(&video->device_list_lock);
1842 list_for_each_entry(dev, &video->video_device_list, entry)
1843 acpi_video_dev_unregister_backlight(dev);
1844 mutex_unlock(&video->device_list_lock);
1846 video->backlight_registered = false;
1851 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1854 struct acpi_device *adev = device->dev;
1856 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1857 acpi_video_device_notify, device);
1858 if (ACPI_FAILURE(status))
1859 dev_err(&adev->dev, "Error installing notify handler\n");
1861 device->flags.notify = 1;
1864 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1866 struct input_dev *input;
1867 struct acpi_video_device *dev;
1870 video->input = input = input_allocate_device();
1876 error = acpi_video_bus_start_devices(video);
1878 goto err_free_input;
1880 snprintf(video->phys, sizeof(video->phys),
1881 "%s/video/input0", acpi_device_hid(video->device));
1883 input->name = acpi_device_name(video->device);
1884 input->phys = video->phys;
1885 input->id.bustype = BUS_HOST;
1886 input->id.product = 0x06;
1887 input->dev.parent = &video->device->dev;
1888 input->evbit[0] = BIT(EV_KEY);
1889 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1890 set_bit(KEY_VIDEO_NEXT, input->keybit);
1891 set_bit(KEY_VIDEO_PREV, input->keybit);
1892 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1893 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1894 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1895 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1896 set_bit(KEY_DISPLAY_OFF, input->keybit);
1898 error = input_register_device(input);
1902 mutex_lock(&video->device_list_lock);
1903 list_for_each_entry(dev, &video->video_device_list, entry)
1904 acpi_video_dev_add_notify_handler(dev);
1905 mutex_unlock(&video->device_list_lock);
1910 acpi_video_bus_stop_devices(video);
1912 input_free_device(input);
1913 video->input = NULL;
1918 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1920 if (dev->flags.notify) {
1921 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1922 acpi_video_device_notify);
1923 dev->flags.notify = 0;
1927 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1929 struct acpi_video_device *dev;
1931 mutex_lock(&video->device_list_lock);
1932 list_for_each_entry(dev, &video->video_device_list, entry)
1933 acpi_video_dev_remove_notify_handler(dev);
1934 mutex_unlock(&video->device_list_lock);
1936 acpi_video_bus_stop_devices(video);
1937 input_unregister_device(video->input);
1938 video->input = NULL;
1941 static int acpi_video_backlight_notify(struct notifier_block *nb,
1942 unsigned long val, void *bd)
1944 struct backlight_device *backlight = bd;
1945 struct acpi_video_bus *video;
1947 /* acpi_video_verify_backlight_support only cares about raw devices */
1948 if (backlight->props.type != BACKLIGHT_RAW)
1951 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1954 case BACKLIGHT_REGISTERED:
1955 if (!acpi_video_verify_backlight_support())
1956 acpi_video_bus_unregister_backlight(video);
1958 case BACKLIGHT_UNREGISTERED:
1959 acpi_video_bus_register_backlight(video);
1966 static int acpi_video_bus_add_backlight_notify_handler(
1967 struct acpi_video_bus *video)
1971 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1972 video->backlight_nb.priority = 0;
1973 error = backlight_register_notifier(&video->backlight_nb);
1975 video->backlight_notifier_registered = true;
1980 static int acpi_video_bus_remove_backlight_notify_handler(
1981 struct acpi_video_bus *video)
1983 if (!video->backlight_notifier_registered)
1986 video->backlight_notifier_registered = false;
1988 return backlight_unregister_notifier(&video->backlight_nb);
1991 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1993 struct acpi_video_device *dev, *next;
1995 mutex_lock(&video->device_list_lock);
1996 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1997 list_del(&dev->entry);
2000 mutex_unlock(&video->device_list_lock);
2005 static int instance;
2007 static int acpi_video_bus_add(struct acpi_device *device)
2009 struct acpi_video_bus *video;
2013 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2014 device->parent->handle, 1,
2015 acpi_video_bus_match, NULL,
2017 if (status == AE_ALREADY_EXISTS) {
2018 printk(KERN_WARNING FW_BUG
2019 "Duplicate ACPI video bus devices for the"
2020 " same VGA controller, please try module "
2021 "parameter \"video.allow_duplicates=1\""
2022 "if the current driver doesn't work.\n");
2023 if (!allow_duplicates)
2027 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2031 /* a hack to fix the duplicate name "VID" problem on T61 */
2032 if (!strcmp(device->pnp.bus_id, "VID")) {
2034 device->pnp.bus_id[3] = '0' + instance;
2037 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2038 if (!strcmp(device->pnp.bus_id, "VGA")) {
2040 device->pnp.bus_id[3] = '0' + instance;
2044 video->device = device;
2045 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2046 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2047 device->driver_data = video;
2049 acpi_video_bus_find_cap(video);
2050 error = acpi_video_bus_check(video);
2052 goto err_free_video;
2054 mutex_init(&video->device_list_lock);
2055 INIT_LIST_HEAD(&video->video_device_list);
2057 error = acpi_video_bus_get_devices(video, device);
2061 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2062 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2063 video->flags.multihead ? "yes" : "no",
2064 video->flags.rom ? "yes" : "no",
2065 video->flags.post ? "yes" : "no");
2066 mutex_lock(&video_list_lock);
2067 list_add_tail(&video->entry, &video_bus_head);
2068 mutex_unlock(&video_list_lock);
2070 acpi_video_bus_register_backlight(video);
2071 acpi_video_bus_add_notify_handler(video);
2072 acpi_video_bus_add_backlight_notify_handler(video);
2077 acpi_video_bus_put_devices(video);
2078 kfree(video->attached_array);
2081 device->driver_data = NULL;
2086 static int acpi_video_bus_remove(struct acpi_device *device)
2088 struct acpi_video_bus *video = NULL;
2091 if (!device || !acpi_driver_data(device))
2094 video = acpi_driver_data(device);
2096 acpi_video_bus_remove_backlight_notify_handler(video);
2097 acpi_video_bus_remove_notify_handler(video);
2098 acpi_video_bus_unregister_backlight(video);
2099 acpi_video_bus_put_devices(video);
2101 mutex_lock(&video_list_lock);
2102 list_del(&video->entry);
2103 mutex_unlock(&video_list_lock);
2105 kfree(video->attached_array);
2111 static int __init is_i740(struct pci_dev *dev)
2113 if (dev->device == 0x00D1)
2115 if (dev->device == 0x7000)
2120 static int __init intel_opregion_present(void)
2123 struct pci_dev *dev = NULL;
2126 for_each_pci_dev(dev) {
2127 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2129 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2131 /* We don't want to poke around undefined i740 registers */
2134 pci_read_config_dword(dev, 0xfc, &address);
2142 int acpi_video_register(void)
2145 if (register_count) {
2147 * if the function of acpi_video_register is already called,
2148 * don't register the acpi_vide_bus again and return no error.
2153 mutex_init(&video_list_lock);
2154 INIT_LIST_HEAD(&video_bus_head);
2156 result = acpi_bus_register_driver(&acpi_video_bus);
2161 * When the acpi_video_bus is loaded successfully, increase
2162 * the counter reference.
2168 EXPORT_SYMBOL(acpi_video_register);
2170 void acpi_video_unregister(void)
2172 if (!register_count) {
2174 * If the acpi video bus is already unloaded, don't
2175 * unload it again and return directly.
2179 acpi_bus_unregister_driver(&acpi_video_bus);
2185 EXPORT_SYMBOL(acpi_video_unregister);
2187 void acpi_video_unregister_backlight(void)
2189 struct acpi_video_bus *video;
2191 if (!register_count)
2194 mutex_lock(&video_list_lock);
2195 list_for_each_entry(video, &video_bus_head, entry)
2196 acpi_video_bus_unregister_backlight(video);
2197 mutex_unlock(&video_list_lock);
2199 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2202 * This is kind of nasty. Hardware using Intel chipsets may require
2203 * the video opregion code to be run first in order to initialise
2204 * state before any ACPI video calls are made. To handle this we defer
2205 * registration of the video class until the opregion code has run.
2208 static int __init acpi_video_init(void)
2210 dmi_check_system(video_dmi_table);
2212 if (intel_opregion_present())
2215 return acpi_video_register();
2218 static void __exit acpi_video_exit(void)
2220 acpi_video_unregister();
2225 module_init(acpi_video_init);
2226 module_exit(acpi_video_exit);