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;
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 2013 models",
586 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
588 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
592 .callback = video_set_use_native_backlight,
593 .ident = "HP EliteBook 2013 models",
595 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
597 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
601 .callback = video_set_use_native_backlight,
602 .ident = "HP ZBook 14",
604 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
609 .callback = video_set_use_native_backlight,
610 .ident = "HP ZBook 15",
612 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
617 .callback = video_set_use_native_backlight,
618 .ident = "HP ZBook 17",
620 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
621 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
625 .callback = video_set_use_native_backlight,
626 .ident = "HP EliteBook 8470p",
628 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
629 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
633 .callback = video_set_use_native_backlight,
634 .ident = "HP EliteBook 8780w",
636 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
637 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
643 static unsigned long long
644 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
645 unsigned long long bqc_value)
647 unsigned long long level;
649 if (device->brightness->flags._BQC_use_index) {
651 * _BQC returns an index that doesn't account for
652 * the first 2 items with special meaning, so we need
653 * to compensate for that by offsetting ourselves
655 if (device->brightness->flags._BCL_reversed)
656 bqc_value = device->brightness->count - 3 - bqc_value;
658 level = device->brightness->levels[bqc_value + 2];
663 level += bqc_offset_aml_bug_workaround;
669 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
670 unsigned long long *level, bool raw)
672 acpi_status status = AE_OK;
675 if (device->cap._BQC || device->cap._BCQ) {
676 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
678 status = acpi_evaluate_integer(device->dev->handle, buf,
680 if (ACPI_SUCCESS(status)) {
683 * Caller has indicated he wants the raw
684 * value returned by _BQC, so don't furtherly
685 * mess with the value.
690 *level = acpi_video_bqc_value_to_level(device, *level);
692 for (i = 2; i < device->brightness->count; i++)
693 if (device->brightness->levels[i] == *level) {
694 device->brightness->curr = *level;
698 * BQC returned an invalid level.
701 ACPI_WARNING((AE_INFO,
702 "%s returned an invalid level",
704 device->cap._BQC = device->cap._BCQ = 0;
708 * should we return an error or ignore this failure?
709 * dev->brightness->curr is a cached value which stores
710 * the correct current backlight level in most cases.
711 * ACPI video backlight still works w/ buggy _BQC.
712 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
714 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
715 device->cap._BQC = device->cap._BCQ = 0;
719 *level = device->brightness->curr;
724 acpi_video_device_EDID(struct acpi_video_device *device,
725 union acpi_object **edid, ssize_t length)
728 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
729 union acpi_object *obj;
730 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
731 struct acpi_object_list args = { 1, &arg0 };
739 arg0.integer.value = 1;
740 else if (length == 256)
741 arg0.integer.value = 2;
745 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
746 if (ACPI_FAILURE(status))
749 obj = buffer.pointer;
751 if (obj && obj->type == ACPI_TYPE_BUFFER)
754 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
766 * video : video bus device pointer
768 * 0. The system BIOS should NOT automatically switch(toggle)
769 * the active display output.
770 * 1. The system BIOS should automatically switch (toggle) the
771 * active display output. No switch event.
772 * 2. The _DGS value should be locked.
773 * 3. The system BIOS should not automatically switch (toggle) the
774 * active display output, but instead generate the display switch
777 * 0. The system BIOS should automatically control the brightness level
778 * of the LCD when the power changes from AC to DC
779 * 1. The system BIOS should NOT automatically control the brightness
780 * level of the LCD when the power changes from AC to DC.
786 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
790 if (!video->cap._DOS)
793 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
795 video->dos_setting = (lcd_flag << 2) | bios_flag;
796 status = acpi_execute_simple_method(video->device->handle, "_DOS",
797 (lcd_flag << 2) | bios_flag);
798 if (ACPI_FAILURE(status))
805 * Simple comparison function used to sort backlight levels.
809 acpi_video_cmp_level(const void *a, const void *b)
811 return *(int *)a - *(int *)b;
815 * Decides if _BQC/_BCQ for this system is usable
817 * We do this by changing the level first and then read out the current
818 * brightness level, if the value does not match, find out if it is using
819 * index. If not, clear the _BQC/_BCQ capability.
821 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
822 int max_level, int current_level)
824 struct acpi_video_device_brightness *br = device->brightness;
826 unsigned long long level;
829 /* don't mess with existing known broken systems */
830 if (bqc_offset_aml_bug_workaround)
834 * Some systems always report current brightness level as maximum
835 * through _BQC, we need to test another value for them.
837 test_level = current_level == max_level ? br->levels[3] : max_level;
839 result = acpi_video_device_lcd_set_level(device, test_level);
843 result = acpi_video_device_lcd_get_level_current(device, &level, true);
847 if (level != test_level) {
848 /* buggy _BQC found, need to find out if it uses index */
849 if (level < br->count) {
850 if (br->flags._BCL_reversed)
851 level = br->count - 3 - level;
852 if (br->levels[level + 2] == test_level)
853 br->flags._BQC_use_index = 1;
856 if (!br->flags._BQC_use_index)
857 device->cap._BQC = device->cap._BCQ = 0;
866 * device : video output device (LCD, CRT, ..)
869 * Maximum brightness level
871 * Allocate and initialize device->brightness.
875 acpi_video_init_brightness(struct acpi_video_device *device)
877 union acpi_object *obj = NULL;
878 int i, max_level = 0, count = 0, level_ac_battery = 0;
879 unsigned long long level, level_old;
880 union acpi_object *o;
881 struct acpi_video_device_brightness *br = NULL;
882 int result = -EINVAL;
885 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
886 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
887 "LCD brightness level\n"));
891 if (obj->package.count < 2)
894 br = kzalloc(sizeof(*br), GFP_KERNEL);
896 printk(KERN_ERR "can't allocate memory\n");
901 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
908 for (i = 0; i < obj->package.count; i++) {
909 o = (union acpi_object *)&obj->package.elements[i];
910 if (o->type != ACPI_TYPE_INTEGER) {
911 printk(KERN_ERR PREFIX "Invalid data\n");
914 value = (u32) o->integer.value;
915 /* Skip duplicate entries */
916 if (count > 2 && br->levels[count - 1] == value)
919 br->levels[count] = value;
921 if (br->levels[count] > max_level)
922 max_level = br->levels[count];
927 * some buggy BIOS don't export the levels
928 * when machine is on AC/Battery in _BCL package.
929 * In this case, the first two elements in _BCL packages
930 * are also supported brightness levels that OS should take care of.
932 for (i = 2; i < count; i++) {
933 if (br->levels[i] == br->levels[0])
935 if (br->levels[i] == br->levels[1])
939 if (level_ac_battery < 2) {
940 level_ac_battery = 2 - level_ac_battery;
941 br->flags._BCL_no_ac_battery_levels = 1;
942 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
943 br->levels[i] = br->levels[i - level_ac_battery];
944 count += level_ac_battery;
945 } else if (level_ac_battery > 2)
946 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
948 /* Check if the _BCL package is in a reversed order */
949 if (max_level == br->levels[2]) {
950 br->flags._BCL_reversed = 1;
951 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
952 acpi_video_cmp_level, NULL);
953 } else if (max_level != br->levels[count - 1])
955 "Found unordered _BCL package"));
958 device->brightness = br;
960 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
961 br->curr = level = max_level;
963 if (!device->cap._BQC)
966 result = acpi_video_device_lcd_get_level_current(device,
969 goto out_free_levels;
971 result = acpi_video_bqc_quirk(device, max_level, level_old);
973 goto out_free_levels;
975 * cap._BQC may get cleared due to _BQC is found to be broken
976 * in acpi_video_bqc_quirk, so check again here.
978 if (!device->cap._BQC)
981 level = acpi_video_bqc_value_to_level(device, level_old);
983 * On some buggy laptops, _BQC returns an uninitialized
984 * value when invoked for the first time, i.e.
985 * level_old is invalid (no matter whether it's a level
986 * or an index). Set the backlight to max_level in this case.
988 for (i = 2; i < br->count; i++)
989 if (level == br->levels[i])
991 if (i == br->count || !level)
995 result = acpi_video_device_lcd_set_level(device, level);
997 goto out_free_levels;
999 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000 "found %d brightness levels\n", count - 2));
1009 device->brightness = NULL;
1016 * device : video output device (LCD, CRT, ..)
1021 * Find out all required AML methods defined under the output
1025 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1027 if (acpi_has_method(device->dev->handle, "_ADR"))
1028 device->cap._ADR = 1;
1029 if (acpi_has_method(device->dev->handle, "_BCL"))
1030 device->cap._BCL = 1;
1031 if (acpi_has_method(device->dev->handle, "_BCM"))
1032 device->cap._BCM = 1;
1033 if (acpi_has_method(device->dev->handle, "_BQC")) {
1034 device->cap._BQC = 1;
1035 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1036 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1037 device->cap._BCQ = 1;
1040 if (acpi_has_method(device->dev->handle, "_DDC"))
1041 device->cap._DDC = 1;
1046 * device : video output device (VGA)
1051 * Find out all required AML methods defined under the video bus device.
1054 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1056 if (acpi_has_method(video->device->handle, "_DOS"))
1057 video->cap._DOS = 1;
1058 if (acpi_has_method(video->device->handle, "_DOD"))
1059 video->cap._DOD = 1;
1060 if (acpi_has_method(video->device->handle, "_ROM"))
1061 video->cap._ROM = 1;
1062 if (acpi_has_method(video->device->handle, "_GPD"))
1063 video->cap._GPD = 1;
1064 if (acpi_has_method(video->device->handle, "_SPD"))
1065 video->cap._SPD = 1;
1066 if (acpi_has_method(video->device->handle, "_VPO"))
1067 video->cap._VPO = 1;
1071 * Check whether the video bus device has required AML method to
1072 * support the desired features
1075 static int acpi_video_bus_check(struct acpi_video_bus *video)
1077 acpi_status status = -ENOENT;
1078 struct pci_dev *dev;
1083 dev = acpi_get_pci_dev(video->device->handle);
1089 * Since there is no HID, CID and so on for VGA driver, we have
1090 * to check well known required nodes.
1093 /* Does this device support video switching? */
1094 if (video->cap._DOS || video->cap._DOD) {
1095 if (!video->cap._DOS) {
1096 printk(KERN_WARNING FW_BUG
1097 "ACPI(%s) defines _DOD but not _DOS\n",
1098 acpi_device_bid(video->device));
1100 video->flags.multihead = 1;
1104 /* Does this device support retrieving a video ROM? */
1105 if (video->cap._ROM) {
1106 video->flags.rom = 1;
1110 /* Does this device support configuring which video device to POST? */
1111 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1112 video->flags.post = 1;
1120 * --------------------------------------------------------------------------
1122 * --------------------------------------------------------------------------
1125 /* device interface */
1126 static struct acpi_video_device_attrib *
1127 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1129 struct acpi_video_enumerated_device *ids;
1132 for (i = 0; i < video->attached_count; i++) {
1133 ids = &video->attached_array[i];
1134 if ((ids->value.int_val & 0xffff) == device_id)
1135 return &ids->value.attrib;
1142 acpi_video_get_device_type(struct acpi_video_bus *video,
1143 unsigned long device_id)
1145 struct acpi_video_enumerated_device *ids;
1148 for (i = 0; i < video->attached_count; i++) {
1149 ids = &video->attached_array[i];
1150 if ((ids->value.int_val & 0xffff) == device_id)
1151 return ids->value.int_val;
1158 acpi_video_bus_get_one_device(struct acpi_device *device,
1159 struct acpi_video_bus *video)
1161 unsigned long long device_id;
1162 int status, device_type;
1163 struct acpi_video_device *data;
1164 struct acpi_video_device_attrib *attribute;
1167 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1168 /* Some device omits _ADR, we skip them instead of fail */
1169 if (ACPI_FAILURE(status))
1172 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1176 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1177 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1178 device->driver_data = data;
1180 data->device_id = device_id;
1181 data->video = video;
1184 attribute = acpi_video_get_device_attr(video, device_id);
1186 if (attribute && attribute->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));
1290 * video : video bus device
1295 * Call _DOD to enumerate all devices attached to display adapter
1299 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1304 struct acpi_video_enumerated_device *active_list;
1305 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1306 union acpi_object *dod = NULL;
1307 union acpi_object *obj;
1309 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1310 if (!ACPI_SUCCESS(status)) {
1311 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1315 dod = buffer.pointer;
1316 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1317 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1322 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1323 dod->package.count));
1325 active_list = kcalloc(1 + dod->package.count,
1326 sizeof(struct acpi_video_enumerated_device),
1334 for (i = 0; i < dod->package.count; i++) {
1335 obj = &dod->package.elements[i];
1337 if (obj->type != ACPI_TYPE_INTEGER) {
1338 printk(KERN_ERR PREFIX
1339 "Invalid _DOD data in element %d\n", i);
1343 active_list[count].value.int_val = obj->integer.value;
1344 active_list[count].bind_info = NULL;
1345 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1346 (int)obj->integer.value));
1350 kfree(video->attached_array);
1352 video->attached_array = active_list;
1353 video->attached_count = count;
1356 kfree(buffer.pointer);
1361 acpi_video_get_next_level(struct acpi_video_device *device,
1362 u32 level_current, u32 event)
1364 int min, max, min_above, max_below, i, l, delta = 255;
1365 max = max_below = 0;
1366 min = min_above = 255;
1367 /* Find closest level to level_current */
1368 for (i = 2; i < device->brightness->count; i++) {
1369 l = device->brightness->levels[i];
1370 if (abs(l - level_current) < abs(delta)) {
1371 delta = l - level_current;
1376 /* Ajust level_current to closest available level */
1377 level_current += delta;
1378 for (i = 2; i < device->brightness->count; i++) {
1379 l = device->brightness->levels[i];
1384 if (l < min_above && l > level_current)
1386 if (l > max_below && l < level_current)
1391 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1392 return (level_current < max) ? min_above : min;
1393 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1394 return (level_current < max) ? min_above : max;
1395 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1396 return (level_current > min) ? max_below : min;
1397 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1398 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1401 return level_current;
1406 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1408 unsigned long long level_current, level_next;
1409 int result = -EINVAL;
1411 /* no warning message if acpi_backlight=vendor or a quirk is used */
1412 if (!acpi_video_verify_backlight_support())
1415 if (!device->brightness)
1418 result = acpi_video_device_lcd_get_level_current(device,
1424 level_next = acpi_video_get_next_level(device, level_current, event);
1426 result = acpi_video_device_lcd_set_level(device, level_next);
1429 backlight_force_update(device->backlight,
1430 BACKLIGHT_UPDATE_HOTKEY);
1434 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1439 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1442 struct acpi_video_bus *video;
1443 struct acpi_video_device *video_device;
1444 union acpi_object *buffer = NULL;
1448 if (!device || !acpi_driver_data(device))
1451 video = acpi_driver_data(device);
1453 for (i = 0; i < video->attached_count; i++) {
1454 video_device = video->attached_array[i].bind_info;
1460 if (!video_device->cap._DDC)
1465 case ACPI_VIDEO_DISPLAY_CRT:
1466 if (!video_device->flags.crt)
1469 case ACPI_VIDEO_DISPLAY_TV:
1470 if (!video_device->flags.tvout)
1473 case ACPI_VIDEO_DISPLAY_DVI:
1474 if (!video_device->flags.dvi)
1477 case ACPI_VIDEO_DISPLAY_LCD:
1478 if (!video_device->flags.lcd)
1482 } else if (video_device->device_id != device_id) {
1486 status = acpi_video_device_EDID(video_device, &buffer, length);
1488 if (ACPI_FAILURE(status) || !buffer ||
1489 buffer->type != ACPI_TYPE_BUFFER) {
1491 status = acpi_video_device_EDID(video_device, &buffer,
1493 if (ACPI_FAILURE(status) || !buffer ||
1494 buffer->type != ACPI_TYPE_BUFFER) {
1499 *edid = buffer->buffer.pointer;
1505 EXPORT_SYMBOL(acpi_video_get_edid);
1508 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1509 struct acpi_device *device)
1512 struct acpi_device *dev;
1515 * There are systems where video module known to work fine regardless
1516 * of broken _DOD and ignoring returned value here doesn't cause
1519 acpi_video_device_enumerate(video);
1521 list_for_each_entry(dev, &device->children, node) {
1523 status = acpi_video_bus_get_one_device(dev, video);
1525 dev_err(&dev->dev, "Can't attach device\n");
1532 /* acpi_video interface */
1535 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1536 * preform any automatic brightness change on receiving a notification.
1538 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1540 return acpi_video_bus_DOS(video, 0,
1541 acpi_osi_is_win8() ? 1 : 0);
1544 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1546 return acpi_video_bus_DOS(video, 0,
1547 acpi_osi_is_win8() ? 0 : 1);
1550 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1552 struct acpi_video_bus *video = acpi_driver_data(device);
1553 struct input_dev *input;
1556 if (!video || !video->input)
1559 input = video->input;
1562 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1563 * most likely via hotkey. */
1564 keycode = KEY_SWITCHVIDEOMODE;
1567 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1569 acpi_video_device_enumerate(video);
1570 acpi_video_device_rebind(video);
1571 keycode = KEY_SWITCHVIDEOMODE;
1574 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1575 keycode = KEY_SWITCHVIDEOMODE;
1577 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1578 keycode = KEY_VIDEO_NEXT;
1580 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1581 keycode = KEY_VIDEO_PREV;
1585 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586 "Unsupported event [0x%x]\n", event));
1590 if (acpi_notifier_call_chain(device, event, 0))
1591 /* Something vetoed the keypress. */
1595 input_report_key(input, keycode, 1);
1597 input_report_key(input, keycode, 0);
1604 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1606 struct acpi_video_device *video_device = data;
1607 struct acpi_device *device = NULL;
1608 struct acpi_video_bus *bus;
1609 struct input_dev *input;
1615 device = video_device->dev;
1616 bus = video_device->video;
1620 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1621 if (brightness_switch_enabled)
1622 acpi_video_switch_brightness(video_device, event);
1623 keycode = KEY_BRIGHTNESS_CYCLE;
1625 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1626 if (brightness_switch_enabled)
1627 acpi_video_switch_brightness(video_device, event);
1628 keycode = KEY_BRIGHTNESSUP;
1630 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1631 if (brightness_switch_enabled)
1632 acpi_video_switch_brightness(video_device, event);
1633 keycode = KEY_BRIGHTNESSDOWN;
1635 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1636 if (brightness_switch_enabled)
1637 acpi_video_switch_brightness(video_device, event);
1638 keycode = KEY_BRIGHTNESS_ZERO;
1640 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1641 if (brightness_switch_enabled)
1642 acpi_video_switch_brightness(video_device, event);
1643 keycode = KEY_DISPLAY_OFF;
1646 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1647 "Unsupported event [0x%x]\n", event));
1651 acpi_notifier_call_chain(device, event, 0);
1654 input_report_key(input, keycode, 1);
1656 input_report_key(input, keycode, 0);
1663 static int acpi_video_resume(struct notifier_block *nb,
1664 unsigned long val, void *ign)
1666 struct acpi_video_bus *video;
1667 struct acpi_video_device *video_device;
1671 case PM_HIBERNATION_PREPARE:
1672 case PM_SUSPEND_PREPARE:
1673 case PM_RESTORE_PREPARE:
1677 video = container_of(nb, struct acpi_video_bus, pm_nb);
1679 dev_info(&video->device->dev, "Restoring backlight state\n");
1681 for (i = 0; i < video->attached_count; i++) {
1682 video_device = video->attached_array[i].bind_info;
1683 if (video_device && video_device->backlight)
1684 acpi_video_set_brightness(video_device->backlight);
1691 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1692 void **return_value)
1694 struct acpi_device *device = context;
1695 struct acpi_device *sibling;
1698 if (handle == device->handle)
1699 return AE_CTRL_TERMINATE;
1701 result = acpi_bus_get_device(handle, &sibling);
1705 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1706 return AE_ALREADY_EXISTS;
1711 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1713 struct backlight_properties props;
1714 struct pci_dev *pdev;
1715 acpi_handle acpi_parent;
1716 struct device *parent = NULL;
1721 result = acpi_video_init_brightness(device);
1724 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1729 acpi_get_parent(device->dev->handle, &acpi_parent);
1731 pdev = acpi_get_pci_dev(acpi_parent);
1733 parent = &pdev->dev;
1737 memset(&props, 0, sizeof(struct backlight_properties));
1738 props.type = BACKLIGHT_FIRMWARE;
1739 props.max_brightness = device->brightness->count - 3;
1740 device->backlight = backlight_device_register(name,
1743 &acpi_backlight_ops,
1746 if (IS_ERR(device->backlight))
1750 * Save current brightness level in case we have to restore it
1751 * before acpi_video_device_lcd_set_level() is called next time.
1753 device->backlight->props.brightness =
1754 acpi_video_get_brightness(device->backlight);
1756 device->cooling_dev = thermal_cooling_device_register("LCD",
1757 device->dev, &video_cooling_ops);
1758 if (IS_ERR(device->cooling_dev)) {
1760 * Set cooling_dev to NULL so we don't crash trying to free it.
1761 * Also, why the hell we are returning early and not attempt to
1762 * register video output if cooling device registration failed?
1765 device->cooling_dev = NULL;
1769 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1770 device->cooling_dev->id);
1771 result = sysfs_create_link(&device->dev->dev.kobj,
1772 &device->cooling_dev->device.kobj,
1775 printk(KERN_ERR PREFIX "Create sysfs link\n");
1776 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1777 &device->dev->dev.kobj, "device");
1779 printk(KERN_ERR PREFIX "Create sysfs link\n");
1782 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1784 struct acpi_video_device *dev;
1786 if (video->backlight_registered)
1789 if (!acpi_video_verify_backlight_support())
1792 mutex_lock(&video->device_list_lock);
1793 list_for_each_entry(dev, &video->video_device_list, entry)
1794 acpi_video_dev_register_backlight(dev);
1795 mutex_unlock(&video->device_list_lock);
1797 video->backlight_registered = true;
1799 video->pm_nb.notifier_call = acpi_video_resume;
1800 video->pm_nb.priority = 0;
1801 return register_pm_notifier(&video->pm_nb);
1804 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1806 if (device->backlight) {
1807 backlight_device_unregister(device->backlight);
1808 device->backlight = NULL;
1810 if (device->brightness) {
1811 kfree(device->brightness->levels);
1812 kfree(device->brightness);
1813 device->brightness = NULL;
1815 if (device->cooling_dev) {
1816 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1817 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1818 thermal_cooling_device_unregister(device->cooling_dev);
1819 device->cooling_dev = NULL;
1823 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1825 struct acpi_video_device *dev;
1828 if (!video->backlight_registered)
1831 error = unregister_pm_notifier(&video->pm_nb);
1833 mutex_lock(&video->device_list_lock);
1834 list_for_each_entry(dev, &video->video_device_list, entry)
1835 acpi_video_dev_unregister_backlight(dev);
1836 mutex_unlock(&video->device_list_lock);
1838 video->backlight_registered = false;
1843 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1846 struct acpi_device *adev = device->dev;
1848 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1849 acpi_video_device_notify, device);
1850 if (ACPI_FAILURE(status))
1851 dev_err(&adev->dev, "Error installing notify handler\n");
1853 device->flags.notify = 1;
1856 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1858 struct input_dev *input;
1859 struct acpi_video_device *dev;
1862 video->input = input = input_allocate_device();
1868 error = acpi_video_bus_start_devices(video);
1870 goto err_free_input;
1872 snprintf(video->phys, sizeof(video->phys),
1873 "%s/video/input0", acpi_device_hid(video->device));
1875 input->name = acpi_device_name(video->device);
1876 input->phys = video->phys;
1877 input->id.bustype = BUS_HOST;
1878 input->id.product = 0x06;
1879 input->dev.parent = &video->device->dev;
1880 input->evbit[0] = BIT(EV_KEY);
1881 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1882 set_bit(KEY_VIDEO_NEXT, input->keybit);
1883 set_bit(KEY_VIDEO_PREV, input->keybit);
1884 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1885 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1886 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1887 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1888 set_bit(KEY_DISPLAY_OFF, input->keybit);
1890 error = input_register_device(input);
1894 mutex_lock(&video->device_list_lock);
1895 list_for_each_entry(dev, &video->video_device_list, entry)
1896 acpi_video_dev_add_notify_handler(dev);
1897 mutex_unlock(&video->device_list_lock);
1902 acpi_video_bus_stop_devices(video);
1904 input_free_device(input);
1905 video->input = NULL;
1910 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1912 if (dev->flags.notify) {
1913 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1914 acpi_video_device_notify);
1915 dev->flags.notify = 0;
1919 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1921 struct acpi_video_device *dev;
1923 mutex_lock(&video->device_list_lock);
1924 list_for_each_entry(dev, &video->video_device_list, entry)
1925 acpi_video_dev_remove_notify_handler(dev);
1926 mutex_unlock(&video->device_list_lock);
1928 acpi_video_bus_stop_devices(video);
1929 input_unregister_device(video->input);
1930 video->input = NULL;
1933 static int acpi_video_backlight_notify(struct notifier_block *nb,
1934 unsigned long val, void *bd)
1936 struct backlight_device *backlight = bd;
1937 struct acpi_video_bus *video;
1939 /* acpi_video_verify_backlight_support only cares about raw devices */
1940 if (backlight->props.type != BACKLIGHT_RAW)
1943 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1946 case BACKLIGHT_REGISTERED:
1947 if (!acpi_video_verify_backlight_support())
1948 acpi_video_bus_unregister_backlight(video);
1950 case BACKLIGHT_UNREGISTERED:
1951 acpi_video_bus_register_backlight(video);
1958 static int acpi_video_bus_add_backlight_notify_handler(
1959 struct acpi_video_bus *video)
1963 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1964 video->backlight_nb.priority = 0;
1965 error = backlight_register_notifier(&video->backlight_nb);
1967 video->backlight_notifier_registered = true;
1972 static int acpi_video_bus_remove_backlight_notify_handler(
1973 struct acpi_video_bus *video)
1975 if (!video->backlight_notifier_registered)
1978 video->backlight_notifier_registered = false;
1980 return backlight_unregister_notifier(&video->backlight_nb);
1983 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1985 struct acpi_video_device *dev, *next;
1987 mutex_lock(&video->device_list_lock);
1988 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1989 list_del(&dev->entry);
1992 mutex_unlock(&video->device_list_lock);
1997 static int instance;
1999 static int acpi_video_bus_add(struct acpi_device *device)
2001 struct acpi_video_bus *video;
2005 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2006 device->parent->handle, 1,
2007 acpi_video_bus_match, NULL,
2009 if (status == AE_ALREADY_EXISTS) {
2010 printk(KERN_WARNING FW_BUG
2011 "Duplicate ACPI video bus devices for the"
2012 " same VGA controller, please try module "
2013 "parameter \"video.allow_duplicates=1\""
2014 "if the current driver doesn't work.\n");
2015 if (!allow_duplicates)
2019 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2023 /* a hack to fix the duplicate name "VID" problem on T61 */
2024 if (!strcmp(device->pnp.bus_id, "VID")) {
2026 device->pnp.bus_id[3] = '0' + instance;
2029 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2030 if (!strcmp(device->pnp.bus_id, "VGA")) {
2032 device->pnp.bus_id[3] = '0' + instance;
2036 video->device = device;
2037 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2038 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2039 device->driver_data = video;
2041 acpi_video_bus_find_cap(video);
2042 error = acpi_video_bus_check(video);
2044 goto err_free_video;
2046 mutex_init(&video->device_list_lock);
2047 INIT_LIST_HEAD(&video->video_device_list);
2049 error = acpi_video_bus_get_devices(video, device);
2053 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2054 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2055 video->flags.multihead ? "yes" : "no",
2056 video->flags.rom ? "yes" : "no",
2057 video->flags.post ? "yes" : "no");
2058 mutex_lock(&video_list_lock);
2059 list_add_tail(&video->entry, &video_bus_head);
2060 mutex_unlock(&video_list_lock);
2062 acpi_video_bus_register_backlight(video);
2063 acpi_video_bus_add_notify_handler(video);
2064 acpi_video_bus_add_backlight_notify_handler(video);
2069 acpi_video_bus_put_devices(video);
2070 kfree(video->attached_array);
2073 device->driver_data = NULL;
2078 static int acpi_video_bus_remove(struct acpi_device *device)
2080 struct acpi_video_bus *video = NULL;
2083 if (!device || !acpi_driver_data(device))
2086 video = acpi_driver_data(device);
2088 acpi_video_bus_remove_backlight_notify_handler(video);
2089 acpi_video_bus_remove_notify_handler(video);
2090 acpi_video_bus_unregister_backlight(video);
2091 acpi_video_bus_put_devices(video);
2093 mutex_lock(&video_list_lock);
2094 list_del(&video->entry);
2095 mutex_unlock(&video_list_lock);
2097 kfree(video->attached_array);
2103 static int __init is_i740(struct pci_dev *dev)
2105 if (dev->device == 0x00D1)
2107 if (dev->device == 0x7000)
2112 static int __init intel_opregion_present(void)
2115 struct pci_dev *dev = NULL;
2118 for_each_pci_dev(dev) {
2119 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2121 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2123 /* We don't want to poke around undefined i740 registers */
2126 pci_read_config_dword(dev, 0xfc, &address);
2134 int acpi_video_register(void)
2137 if (register_count) {
2139 * if the function of acpi_video_register is already called,
2140 * don't register the acpi_vide_bus again and return no error.
2145 mutex_init(&video_list_lock);
2146 INIT_LIST_HEAD(&video_bus_head);
2148 result = acpi_bus_register_driver(&acpi_video_bus);
2153 * When the acpi_video_bus is loaded successfully, increase
2154 * the counter reference.
2160 EXPORT_SYMBOL(acpi_video_register);
2162 void acpi_video_unregister(void)
2164 if (!register_count) {
2166 * If the acpi video bus is already unloaded, don't
2167 * unload it again and return directly.
2171 acpi_bus_unregister_driver(&acpi_video_bus);
2177 EXPORT_SYMBOL(acpi_video_unregister);
2179 void acpi_video_unregister_backlight(void)
2181 struct acpi_video_bus *video;
2183 if (!register_count)
2186 mutex_lock(&video_list_lock);
2187 list_for_each_entry(video, &video_bus_head, entry)
2188 acpi_video_bus_unregister_backlight(video);
2189 mutex_unlock(&video_list_lock);
2191 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2194 * This is kind of nasty. Hardware using Intel chipsets may require
2195 * the video opregion code to be run first in order to initialise
2196 * state before any ACPI video calls are made. To handle this we defer
2197 * registration of the video class until the opregion code has run.
2200 static int __init acpi_video_init(void)
2202 dmi_check_system(video_dmi_table);
2204 if (intel_opregion_present())
2207 return acpi_video_register();
2210 static void __exit acpi_video_exit(void)
2212 acpi_video_unregister();
2217 module_init(acpi_video_init);
2218 module_exit(acpi_video_exit);