2 * video.c - ACPI Video Driver ($Revision:$)
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 <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
49 #define PREFIX "ACPI: "
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
65 #define MAX_NAME_LEN 20
67 #define _COMPONENT ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
74 static bool brightness_switch_enabled = 1;
75 module_param(brightness_switch_enabled, bool, 0644);
78 * By default, we don't allow duplicate ACPI video bus devices
79 * under the same VGA controller
81 static bool allow_duplicates;
82 module_param(allow_duplicates, bool, 0644);
85 * Some BIOSes claim they use minimum backlight at boot,
86 * and this may bring dimming screen after boot
88 static bool use_bios_initial_backlight = 1;
89 module_param(use_bios_initial_backlight, bool, 0644);
91 static int register_count = 0;
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;
154 struct acpi_video_enumerated_device *attached_array;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct input_dev *input;
161 char phys[32]; /* for input device */
162 struct notifier_block pm_nb;
165 struct acpi_video_device_flags {
176 struct acpi_video_device_cap {
177 u8 _ADR:1; /*Return the unique ID */
178 u8 _BCL:1; /*Query list of brightness control levels supported */
179 u8 _BCM:1; /*Set the brightness level */
180 u8 _BQC:1; /* Get current brightness level */
181 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
182 u8 _DDC:1; /*Return the EDID for this device */
185 struct acpi_video_brightness_flags {
186 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
187 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
188 u8 _BCL_use_index:1; /* levels in _BCL are index values */
189 u8 _BCM_use_index:1; /* input of _BCM is an index value */
190 u8 _BQC_use_index:1; /* _BQC returns an index value */
193 struct acpi_video_device_brightness {
197 struct acpi_video_brightness_flags flags;
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct acpi_video_bus *video;
206 struct acpi_device *dev;
207 struct acpi_video_device_brightness *brightness;
208 struct backlight_device *backlight;
209 struct thermal_cooling_device *cooling_dev;
212 static const char device_decode[][30] = {
213 "motherboard VGA device",
219 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
220 static void acpi_video_device_rebind(struct acpi_video_bus *video);
221 static void acpi_video_device_bind(struct acpi_video_bus *video,
222 struct acpi_video_device *device);
223 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
224 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
226 static int acpi_video_device_lcd_get_level_current(
227 struct acpi_video_device *device,
228 unsigned long long *level, bool raw);
229 static int acpi_video_get_next_level(struct acpi_video_device *device,
230 u32 level_current, u32 event);
231 static int acpi_video_switch_brightness(struct acpi_video_device *device,
234 /*backlight device sysfs support*/
235 static int acpi_video_get_brightness(struct backlight_device *bd)
237 unsigned long long cur_level;
239 struct acpi_video_device *vd =
240 (struct acpi_video_device *)bl_get_data(bd);
242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
244 for (i = 2; i < vd->brightness->count; i++) {
245 if (vd->brightness->levels[i] == cur_level)
246 /* The first two entries are special - see page 575
247 of the ACPI spec 3.0 */
253 static int acpi_video_set_brightness(struct backlight_device *bd)
255 int request_level = bd->props.brightness + 2;
256 struct acpi_video_device *vd =
257 (struct acpi_video_device *)bl_get_data(bd);
259 return acpi_video_device_lcd_set_level(vd,
260 vd->brightness->levels[request_level]);
263 static const struct backlight_ops acpi_backlight_ops = {
264 .get_brightness = acpi_video_get_brightness,
265 .update_status = acpi_video_set_brightness,
268 /* thermal cooling device callbacks */
269 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
272 struct acpi_device *device = cooling_dev->devdata;
273 struct acpi_video_device *video = acpi_driver_data(device);
275 *state = video->brightness->count - 3;
279 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
282 struct acpi_device *device = cooling_dev->devdata;
283 struct acpi_video_device *video = acpi_driver_data(device);
284 unsigned long long level;
287 if (acpi_video_device_lcd_get_level_current(video, &level, false))
289 for (offset = 2; offset < video->brightness->count; offset++)
290 if (level == video->brightness->levels[offset]) {
291 *state = video->brightness->count - offset - 1;
299 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
301 struct acpi_device *device = cooling_dev->devdata;
302 struct acpi_video_device *video = acpi_driver_data(device);
305 if ( state >= video->brightness->count - 2)
308 state = video->brightness->count - state;
309 level = video->brightness->levels[state -1];
310 return acpi_video_device_lcd_set_level(video, level);
313 static const struct thermal_cooling_device_ops video_cooling_ops = {
314 .get_max_state = video_get_max_state,
315 .get_cur_state = video_get_cur_state,
316 .set_cur_state = video_set_cur_state,
319 /* --------------------------------------------------------------------------
321 -------------------------------------------------------------------------- */
324 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
325 union acpi_object **levels)
328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
329 union acpi_object *obj;
334 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
335 if (!ACPI_SUCCESS(status))
337 obj = (union acpi_object *)buffer.pointer;
338 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
339 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
349 kfree(buffer.pointer);
355 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
358 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
359 struct acpi_object_list args = { 1, &arg0 };
362 arg0.integer.value = level;
364 status = acpi_evaluate_object(device->dev->handle, "_BCM",
366 if (ACPI_FAILURE(status)) {
367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
371 device->brightness->curr = level;
372 for (state = 2; state < device->brightness->count; state++)
373 if (level == device->brightness->levels[state]) {
374 if (device->backlight)
375 device->backlight->props.brightness = state - 2;
379 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
388 static int bqc_offset_aml_bug_workaround;
389 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
391 bqc_offset_aml_bug_workaround = 9;
395 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
397 use_bios_initial_backlight = 0;
401 static struct dmi_system_id video_dmi_table[] __initdata = {
403 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
406 .callback = video_set_bqc_offset,
407 .ident = "Acer Aspire 5720",
409 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
410 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
414 .callback = video_set_bqc_offset,
415 .ident = "Acer Aspire 5710Z",
417 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
422 .callback = video_set_bqc_offset,
423 .ident = "eMachines E510",
425 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
430 .callback = video_set_bqc_offset,
431 .ident = "Acer Aspire 5315",
433 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
438 .callback = video_set_bqc_offset,
439 .ident = "Acer Aspire 7720",
441 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
446 .callback = video_ignore_initial_backlight,
447 .ident = "HP Folio 13-2000",
449 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
454 .callback = video_ignore_initial_backlight,
455 .ident = "Fujitsu E753",
457 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
458 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
462 .callback = video_ignore_initial_backlight,
463 .ident = "HP Pavilion dm4",
465 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
466 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
470 .callback = video_ignore_initial_backlight,
471 .ident = "HP Pavilion g6 Notebook PC",
473 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
474 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
478 .callback = video_ignore_initial_backlight,
479 .ident = "HP 1000 Notebook PC",
481 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
482 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
486 .callback = video_ignore_initial_backlight,
487 .ident = "HP Pavilion m4",
489 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
490 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
496 static unsigned long long
497 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
498 unsigned long long bqc_value)
500 unsigned long long level;
502 if (device->brightness->flags._BQC_use_index) {
504 * _BQC returns an index that doesn't account for
505 * the first 2 items with special meaning, so we need
506 * to compensate for that by offsetting ourselves
508 if (device->brightness->flags._BCL_reversed)
509 bqc_value = device->brightness->count - 3 - bqc_value;
511 level = device->brightness->levels[bqc_value + 2];
516 level += bqc_offset_aml_bug_workaround;
522 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
523 unsigned long long *level, bool raw)
525 acpi_status status = AE_OK;
528 if (device->cap._BQC || device->cap._BCQ) {
529 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
531 status = acpi_evaluate_integer(device->dev->handle, buf,
533 if (ACPI_SUCCESS(status)) {
536 * Caller has indicated he wants the raw
537 * value returned by _BQC, so don't furtherly
538 * mess with the value.
543 *level = acpi_video_bqc_value_to_level(device, *level);
545 for (i = 2; i < device->brightness->count; i++)
546 if (device->brightness->levels[i] == *level) {
547 device->brightness->curr = *level;
551 * BQC returned an invalid level.
554 ACPI_WARNING((AE_INFO,
555 "%s returned an invalid level",
557 device->cap._BQC = device->cap._BCQ = 0;
560 * should we return an error or ignore this failure?
561 * dev->brightness->curr is a cached value which stores
562 * the correct current backlight level in most cases.
563 * ACPI video backlight still works w/ buggy _BQC.
564 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
566 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
567 device->cap._BQC = device->cap._BCQ = 0;
571 *level = device->brightness->curr;
576 acpi_video_device_EDID(struct acpi_video_device *device,
577 union acpi_object **edid, ssize_t length)
580 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
581 union acpi_object *obj;
582 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
583 struct acpi_object_list args = { 1, &arg0 };
591 arg0.integer.value = 1;
592 else if (length == 256)
593 arg0.integer.value = 2;
597 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
598 if (ACPI_FAILURE(status))
601 obj = buffer.pointer;
603 if (obj && obj->type == ACPI_TYPE_BUFFER)
606 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
618 * video : video bus device pointer
620 * 0. The system BIOS should NOT automatically switch(toggle)
621 * the active display output.
622 * 1. The system BIOS should automatically switch (toggle) the
623 * active display output. No switch event.
624 * 2. The _DGS value should be locked.
625 * 3. The system BIOS should not automatically switch (toggle) the
626 * active display output, but instead generate the display switch
629 * 0. The system BIOS should automatically control the brightness level
630 * of the LCD when the power changes from AC to DC
631 * 1. The system BIOS should NOT automatically control the brightness
632 * level of the LCD when the power changes from AC to DC.
638 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
641 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
642 struct acpi_object_list args = { 1, &arg0 };
644 if (!video->cap._DOS)
647 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
649 arg0.integer.value = (lcd_flag << 2) | bios_flag;
650 video->dos_setting = arg0.integer.value;
651 status = acpi_evaluate_object(video->device->handle, "_DOS",
653 if (ACPI_FAILURE(status))
660 * Simple comparison function used to sort backlight levels.
664 acpi_video_cmp_level(const void *a, const void *b)
666 return *(int *)a - *(int *)b;
670 * Decides if _BQC/_BCQ for this system is usable
672 * We do this by changing the level first and then read out the current
673 * brightness level, if the value does not match, find out if it is using
674 * index. If not, clear the _BQC/_BCQ capability.
676 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
677 int max_level, int current_level)
679 struct acpi_video_device_brightness *br = device->brightness;
681 unsigned long long level;
684 /* don't mess with existing known broken systems */
685 if (bqc_offset_aml_bug_workaround)
689 * Some systems always report current brightness level as maximum
690 * through _BQC, we need to test another value for them.
692 test_level = current_level == max_level ? br->levels[3] : max_level;
694 result = acpi_video_device_lcd_set_level(device, test_level);
698 result = acpi_video_device_lcd_get_level_current(device, &level, true);
702 if (level != test_level) {
703 /* buggy _BQC found, need to find out if it uses index */
704 if (level < br->count) {
705 if (br->flags._BCL_reversed)
706 level = br->count - 3 - level;
707 if (br->levels[level + 2] == test_level)
708 br->flags._BQC_use_index = 1;
711 if (!br->flags._BQC_use_index)
712 device->cap._BQC = device->cap._BCQ = 0;
721 * device : video output device (LCD, CRT, ..)
724 * Maximum brightness level
726 * Allocate and initialize device->brightness.
730 acpi_video_init_brightness(struct acpi_video_device *device)
732 union acpi_object *obj = NULL;
733 int i, max_level = 0, count = 0, level_ac_battery = 0;
734 unsigned long long level, level_old;
735 union acpi_object *o;
736 struct acpi_video_device_brightness *br = NULL;
737 int result = -EINVAL;
739 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
741 "LCD brightness level\n"));
745 if (obj->package.count < 2)
748 br = kzalloc(sizeof(*br), GFP_KERNEL);
750 printk(KERN_ERR "can't allocate memory\n");
755 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
762 for (i = 0; i < obj->package.count; i++) {
763 o = (union acpi_object *)&obj->package.elements[i];
764 if (o->type != ACPI_TYPE_INTEGER) {
765 printk(KERN_ERR PREFIX "Invalid data\n");
768 br->levels[count] = (u32) o->integer.value;
770 if (br->levels[count] > max_level)
771 max_level = br->levels[count];
776 * some buggy BIOS don't export the levels
777 * when machine is on AC/Battery in _BCL package.
778 * In this case, the first two elements in _BCL packages
779 * are also supported brightness levels that OS should take care of.
781 for (i = 2; i < count; i++) {
782 if (br->levels[i] == br->levels[0])
784 if (br->levels[i] == br->levels[1])
788 if (level_ac_battery < 2) {
789 level_ac_battery = 2 - level_ac_battery;
790 br->flags._BCL_no_ac_battery_levels = 1;
791 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
792 br->levels[i] = br->levels[i - level_ac_battery];
793 count += level_ac_battery;
794 } else if (level_ac_battery > 2)
795 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
797 /* Check if the _BCL package is in a reversed order */
798 if (max_level == br->levels[2]) {
799 br->flags._BCL_reversed = 1;
800 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
801 acpi_video_cmp_level, NULL);
802 } else if (max_level != br->levels[count - 1])
804 "Found unordered _BCL package"));
807 device->brightness = br;
809 /* Check the input/output of _BQC/_BCL/_BCM */
810 if ((max_level < 100) && (max_level <= (count - 2)))
811 br->flags._BCL_use_index = 1;
814 * _BCM is always consistent with _BCL,
815 * at least for all the laptops we have ever seen.
817 br->flags._BCM_use_index = br->flags._BCL_use_index;
819 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
820 br->curr = level = max_level;
822 if (!device->cap._BQC)
825 result = acpi_video_device_lcd_get_level_current(device,
828 goto out_free_levels;
830 result = acpi_video_bqc_quirk(device, max_level, level_old);
832 goto out_free_levels;
834 * cap._BQC may get cleared due to _BQC is found to be broken
835 * in acpi_video_bqc_quirk, so check again here.
837 if (!device->cap._BQC)
840 if (use_bios_initial_backlight) {
841 level = acpi_video_bqc_value_to_level(device, level_old);
843 * On some buggy laptops, _BQC returns an uninitialized
844 * value when invoked for the first time, i.e.
845 * level_old is invalid (no matter whether it's a level
846 * or an index). Set the backlight to max_level in this case.
848 for (i = 2; i < br->count; i++)
849 if (level_old == br->levels[i])
856 result = acpi_video_device_lcd_set_level(device, level);
858 goto out_free_levels;
860 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
861 "found %d brightness levels\n", count - 2));
870 device->brightness = NULL;
877 * device : video output device (LCD, CRT, ..)
882 * Find out all required AML methods defined under the output
886 static void acpi_video_device_find_cap(struct acpi_video_device *device)
888 acpi_handle h_dummy1;
890 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
891 device->cap._ADR = 1;
893 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
894 device->cap._BCL = 1;
896 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
897 device->cap._BCM = 1;
899 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
900 device->cap._BQC = 1;
901 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
903 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
904 device->cap._BCQ = 1;
907 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
908 device->cap._DDC = 1;
911 if (acpi_video_backlight_support()) {
912 struct backlight_properties props;
913 struct pci_dev *pdev;
914 acpi_handle acpi_parent;
915 struct device *parent = NULL;
917 static int count = 0;
920 result = acpi_video_init_brightness(device);
923 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
928 acpi_get_parent(device->dev->handle, &acpi_parent);
930 pdev = acpi_get_pci_dev(acpi_parent);
936 memset(&props, 0, sizeof(struct backlight_properties));
937 props.type = BACKLIGHT_FIRMWARE;
938 props.max_brightness = device->brightness->count - 3;
939 device->backlight = backlight_device_register(name,
945 if (IS_ERR(device->backlight))
949 * Save current brightness level in case we have to restore it
950 * before acpi_video_device_lcd_set_level() is called next time.
952 device->backlight->props.brightness =
953 acpi_video_get_brightness(device->backlight);
955 device->cooling_dev = thermal_cooling_device_register("LCD",
956 device->dev, &video_cooling_ops);
957 if (IS_ERR(device->cooling_dev)) {
959 * Set cooling_dev to NULL so we don't crash trying to
961 * Also, why the hell we are returning early and
962 * not attempt to register video output if cooling
963 * device registration failed?
966 device->cooling_dev = NULL;
970 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
971 device->cooling_dev->id);
972 result = sysfs_create_link(&device->dev->dev.kobj,
973 &device->cooling_dev->device.kobj,
976 printk(KERN_ERR PREFIX "Create sysfs link\n");
977 result = sysfs_create_link(&device->cooling_dev->device.kobj,
978 &device->dev->dev.kobj, "device");
980 printk(KERN_ERR PREFIX "Create sysfs link\n");
987 * device : video output device (VGA)
992 * Find out all required AML methods defined under the video bus device.
995 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
997 acpi_handle h_dummy1;
999 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1000 video->cap._DOS = 1;
1002 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1003 video->cap._DOD = 1;
1005 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1006 video->cap._ROM = 1;
1008 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1009 video->cap._GPD = 1;
1011 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1012 video->cap._SPD = 1;
1014 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1015 video->cap._VPO = 1;
1020 * Check whether the video bus device has required AML method to
1021 * support the desired features
1024 static int acpi_video_bus_check(struct acpi_video_bus *video)
1026 acpi_status status = -ENOENT;
1027 struct pci_dev *dev;
1032 dev = acpi_get_pci_dev(video->device->handle);
1037 /* Since there is no HID, CID and so on for VGA driver, we have
1038 * to check well known required nodes.
1041 /* Does this device support video switching? */
1042 if (video->cap._DOS || video->cap._DOD) {
1043 if (!video->cap._DOS) {
1044 printk(KERN_WARNING FW_BUG
1045 "ACPI(%s) defines _DOD but not _DOS\n",
1046 acpi_device_bid(video->device));
1048 video->flags.multihead = 1;
1052 /* Does this device support retrieving a video ROM? */
1053 if (video->cap._ROM) {
1054 video->flags.rom = 1;
1058 /* Does this device support configuring which video device to POST? */
1059 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1060 video->flags.post = 1;
1067 /* --------------------------------------------------------------------------
1069 -------------------------------------------------------------------------- */
1071 /* device interface */
1072 static struct acpi_video_device_attrib*
1073 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1075 struct acpi_video_enumerated_device *ids;
1078 for (i = 0; i < video->attached_count; i++) {
1079 ids = &video->attached_array[i];
1080 if ((ids->value.int_val & 0xffff) == device_id)
1081 return &ids->value.attrib;
1088 acpi_video_get_device_type(struct acpi_video_bus *video,
1089 unsigned long device_id)
1091 struct acpi_video_enumerated_device *ids;
1094 for (i = 0; i < video->attached_count; i++) {
1095 ids = &video->attached_array[i];
1096 if ((ids->value.int_val & 0xffff) == device_id)
1097 return ids->value.int_val;
1104 acpi_video_bus_get_one_device(struct acpi_device *device,
1105 struct acpi_video_bus *video)
1107 unsigned long long device_id;
1108 int status, device_type;
1109 struct acpi_video_device *data;
1110 struct acpi_video_device_attrib* attribute;
1113 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1114 /* Some device omits _ADR, we skip them instead of fail */
1115 if (ACPI_FAILURE(status))
1118 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1122 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1123 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1124 device->driver_data = data;
1126 data->device_id = device_id;
1127 data->video = video;
1130 attribute = acpi_video_get_device_attr(video, device_id);
1132 if((attribute != NULL) && attribute->device_id_scheme) {
1133 switch (attribute->display_type) {
1134 case ACPI_VIDEO_DISPLAY_CRT:
1135 data->flags.crt = 1;
1137 case ACPI_VIDEO_DISPLAY_TV:
1138 data->flags.tvout = 1;
1140 case ACPI_VIDEO_DISPLAY_DVI:
1141 data->flags.dvi = 1;
1143 case ACPI_VIDEO_DISPLAY_LCD:
1144 data->flags.lcd = 1;
1147 data->flags.unknown = 1;
1150 if(attribute->bios_can_detect)
1151 data->flags.bios = 1;
1153 /* Check for legacy IDs */
1154 device_type = acpi_video_get_device_type(video, device_id);
1155 /* Ignore bits 16 and 18-20 */
1156 switch (device_type & 0xffe2ffff) {
1157 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1158 data->flags.crt = 1;
1160 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1161 data->flags.lcd = 1;
1163 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1164 data->flags.tvout = 1;
1167 data->flags.unknown = 1;
1171 acpi_video_device_bind(video, data);
1172 acpi_video_device_find_cap(data);
1174 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1175 acpi_video_device_notify, data);
1176 if (ACPI_FAILURE(status))
1177 dev_err(&device->dev, "Error installing notify handler\n");
1179 data->flags.notify = 1;
1181 mutex_lock(&video->device_list_lock);
1182 list_add_tail(&data->entry, &video->video_device_list);
1183 mutex_unlock(&video->device_list_lock);
1190 * video : video bus device
1195 * Enumerate the video device list of the video bus,
1196 * bind the ids with the corresponding video devices
1197 * under the video bus.
1200 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1202 struct acpi_video_device *dev;
1204 mutex_lock(&video->device_list_lock);
1206 list_for_each_entry(dev, &video->video_device_list, entry)
1207 acpi_video_device_bind(video, dev);
1209 mutex_unlock(&video->device_list_lock);
1214 * video : video bus device
1215 * device : video output device under the video
1221 * Bind the ids with the corresponding video devices
1222 * under the video bus.
1226 acpi_video_device_bind(struct acpi_video_bus *video,
1227 struct acpi_video_device *device)
1229 struct acpi_video_enumerated_device *ids;
1232 for (i = 0; i < video->attached_count; i++) {
1233 ids = &video->attached_array[i];
1234 if (device->device_id == (ids->value.int_val & 0xffff)) {
1235 ids->bind_info = device;
1236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1243 * video : video bus device
1248 * Call _DOD to enumerate all devices attached to display adapter
1252 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1257 struct acpi_video_enumerated_device *active_list;
1258 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1259 union acpi_object *dod = NULL;
1260 union acpi_object *obj;
1262 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1263 if (!ACPI_SUCCESS(status)) {
1264 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1268 dod = buffer.pointer;
1269 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1270 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1276 dod->package.count));
1278 active_list = kcalloc(1 + dod->package.count,
1279 sizeof(struct acpi_video_enumerated_device),
1287 for (i = 0; i < dod->package.count; i++) {
1288 obj = &dod->package.elements[i];
1290 if (obj->type != ACPI_TYPE_INTEGER) {
1291 printk(KERN_ERR PREFIX
1292 "Invalid _DOD data in element %d\n", i);
1296 active_list[count].value.int_val = obj->integer.value;
1297 active_list[count].bind_info = NULL;
1298 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1299 (int)obj->integer.value));
1303 kfree(video->attached_array);
1305 video->attached_array = active_list;
1306 video->attached_count = count;
1309 kfree(buffer.pointer);
1314 acpi_video_get_next_level(struct acpi_video_device *device,
1315 u32 level_current, u32 event)
1317 int min, max, min_above, max_below, i, l, delta = 255;
1318 max = max_below = 0;
1319 min = min_above = 255;
1320 /* Find closest level to level_current */
1321 for (i = 2; i < device->brightness->count; i++) {
1322 l = device->brightness->levels[i];
1323 if (abs(l - level_current) < abs(delta)) {
1324 delta = l - level_current;
1329 /* Ajust level_current to closest available level */
1330 level_current += delta;
1331 for (i = 2; i < device->brightness->count; i++) {
1332 l = device->brightness->levels[i];
1337 if (l < min_above && l > level_current)
1339 if (l > max_below && l < level_current)
1344 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1345 return (level_current < max) ? min_above : min;
1346 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1347 return (level_current < max) ? min_above : max;
1348 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1349 return (level_current > min) ? max_below : min;
1350 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1351 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1354 return level_current;
1359 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1361 unsigned long long level_current, level_next;
1362 int result = -EINVAL;
1364 /* no warning message if acpi_backlight=vendor is used */
1365 if (!acpi_video_backlight_support())
1368 if (!device->brightness)
1371 result = acpi_video_device_lcd_get_level_current(device,
1377 level_next = acpi_video_get_next_level(device, level_current, event);
1379 result = acpi_video_device_lcd_set_level(device, level_next);
1382 backlight_force_update(device->backlight,
1383 BACKLIGHT_UPDATE_HOTKEY);
1387 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1392 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1395 struct acpi_video_bus *video;
1396 struct acpi_video_device *video_device;
1397 union acpi_object *buffer = NULL;
1401 if (!device || !acpi_driver_data(device))
1404 video = acpi_driver_data(device);
1406 for (i = 0; i < video->attached_count; i++) {
1407 video_device = video->attached_array[i].bind_info;
1413 if (!video_device->cap._DDC)
1418 case ACPI_VIDEO_DISPLAY_CRT:
1419 if (!video_device->flags.crt)
1422 case ACPI_VIDEO_DISPLAY_TV:
1423 if (!video_device->flags.tvout)
1426 case ACPI_VIDEO_DISPLAY_DVI:
1427 if (!video_device->flags.dvi)
1430 case ACPI_VIDEO_DISPLAY_LCD:
1431 if (!video_device->flags.lcd)
1435 } else if (video_device->device_id != device_id) {
1439 status = acpi_video_device_EDID(video_device, &buffer, length);
1441 if (ACPI_FAILURE(status) || !buffer ||
1442 buffer->type != ACPI_TYPE_BUFFER) {
1444 status = acpi_video_device_EDID(video_device, &buffer,
1446 if (ACPI_FAILURE(status) || !buffer ||
1447 buffer->type != ACPI_TYPE_BUFFER) {
1452 *edid = buffer->buffer.pointer;
1458 EXPORT_SYMBOL(acpi_video_get_edid);
1461 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1462 struct acpi_device *device)
1465 struct acpi_device *dev;
1468 * There are systems where video module known to work fine regardless
1469 * of broken _DOD and ignoring returned value here doesn't cause
1472 acpi_video_device_enumerate(video);
1474 list_for_each_entry(dev, &device->children, node) {
1476 status = acpi_video_bus_get_one_device(dev, video);
1478 dev_err(&dev->dev, "Can't attach device\n");
1485 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1489 if (!device || !device->video)
1492 if (device->flags.notify) {
1493 status = acpi_remove_notify_handler(device->dev->handle,
1494 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1495 if (ACPI_FAILURE(status))
1496 dev_err(&device->dev->dev,
1497 "Can't remove video notify handler\n");
1500 if (device->backlight) {
1501 backlight_device_unregister(device->backlight);
1502 device->backlight = NULL;
1504 if (device->cooling_dev) {
1505 sysfs_remove_link(&device->dev->dev.kobj,
1507 sysfs_remove_link(&device->cooling_dev->device.kobj,
1509 thermal_cooling_device_unregister(device->cooling_dev);
1510 device->cooling_dev = NULL;
1516 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1519 struct acpi_video_device *dev, *next;
1521 mutex_lock(&video->device_list_lock);
1523 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1525 status = acpi_video_bus_put_one_device(dev);
1526 if (ACPI_FAILURE(status))
1527 printk(KERN_WARNING PREFIX
1528 "hhuuhhuu bug in acpi video driver.\n");
1530 if (dev->brightness) {
1531 kfree(dev->brightness->levels);
1532 kfree(dev->brightness);
1534 list_del(&dev->entry);
1538 mutex_unlock(&video->device_list_lock);
1543 /* acpi_video interface */
1546 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1547 * preform any automatic brightness change on receiving a notification.
1549 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1551 return acpi_video_bus_DOS(video, 0,
1552 acpi_video_backlight_quirks() ? 1 : 0);
1555 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1557 return acpi_video_bus_DOS(video, 0,
1558 acpi_video_backlight_quirks() ? 0 : 1);
1561 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1563 struct acpi_video_bus *video = acpi_driver_data(device);
1564 struct input_dev *input;
1570 input = video->input;
1573 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1574 * most likely via hotkey. */
1575 acpi_bus_generate_proc_event(device, event, 0);
1576 keycode = KEY_SWITCHVIDEOMODE;
1579 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1581 acpi_video_device_enumerate(video);
1582 acpi_video_device_rebind(video);
1583 acpi_bus_generate_proc_event(device, event, 0);
1584 keycode = KEY_SWITCHVIDEOMODE;
1587 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1588 acpi_bus_generate_proc_event(device, event, 0);
1589 keycode = KEY_SWITCHVIDEOMODE;
1591 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1592 acpi_bus_generate_proc_event(device, event, 0);
1593 keycode = KEY_VIDEO_NEXT;
1595 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1596 acpi_bus_generate_proc_event(device, event, 0);
1597 keycode = KEY_VIDEO_PREV;
1601 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1602 "Unsupported event [0x%x]\n", event));
1606 if (acpi_notifier_call_chain(device, event, 0))
1607 /* Something vetoed the keypress. */
1611 input_report_key(input, keycode, 1);
1613 input_report_key(input, keycode, 0);
1620 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1622 struct acpi_video_device *video_device = data;
1623 struct acpi_device *device = NULL;
1624 struct acpi_video_bus *bus;
1625 struct input_dev *input;
1631 device = video_device->dev;
1632 bus = video_device->video;
1636 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1637 if (brightness_switch_enabled)
1638 acpi_video_switch_brightness(video_device, event);
1639 acpi_bus_generate_proc_event(device, event, 0);
1640 keycode = KEY_BRIGHTNESS_CYCLE;
1642 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1643 if (brightness_switch_enabled)
1644 acpi_video_switch_brightness(video_device, event);
1645 acpi_bus_generate_proc_event(device, event, 0);
1646 keycode = KEY_BRIGHTNESSUP;
1648 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1649 if (brightness_switch_enabled)
1650 acpi_video_switch_brightness(video_device, event);
1651 acpi_bus_generate_proc_event(device, event, 0);
1652 keycode = KEY_BRIGHTNESSDOWN;
1654 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1655 if (brightness_switch_enabled)
1656 acpi_video_switch_brightness(video_device, event);
1657 acpi_bus_generate_proc_event(device, event, 0);
1658 keycode = KEY_BRIGHTNESS_ZERO;
1660 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1661 if (brightness_switch_enabled)
1662 acpi_video_switch_brightness(video_device, event);
1663 acpi_bus_generate_proc_event(device, event, 0);
1664 keycode = KEY_DISPLAY_OFF;
1667 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1668 "Unsupported event [0x%x]\n", event));
1672 acpi_notifier_call_chain(device, event, 0);
1675 input_report_key(input, keycode, 1);
1677 input_report_key(input, keycode, 0);
1684 static int acpi_video_resume(struct notifier_block *nb,
1685 unsigned long val, void *ign)
1687 struct acpi_video_bus *video;
1688 struct acpi_video_device *video_device;
1692 case PM_HIBERNATION_PREPARE:
1693 case PM_SUSPEND_PREPARE:
1694 case PM_RESTORE_PREPARE:
1698 video = container_of(nb, struct acpi_video_bus, pm_nb);
1700 dev_info(&video->device->dev, "Restoring backlight state\n");
1702 for (i = 0; i < video->attached_count; i++) {
1703 video_device = video->attached_array[i].bind_info;
1704 if (video_device && video_device->backlight)
1705 acpi_video_set_brightness(video_device->backlight);
1712 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1713 void **return_value)
1715 struct acpi_device *device = context;
1716 struct acpi_device *sibling;
1719 if (handle == device->handle)
1720 return AE_CTRL_TERMINATE;
1722 result = acpi_bus_get_device(handle, &sibling);
1726 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1727 return AE_ALREADY_EXISTS;
1732 static int instance;
1734 static int acpi_video_bus_add(struct acpi_device *device)
1736 struct acpi_video_bus *video;
1737 struct input_dev *input;
1741 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1742 device->parent->handle, 1,
1743 acpi_video_bus_match, NULL,
1745 if (status == AE_ALREADY_EXISTS) {
1746 printk(KERN_WARNING FW_BUG
1747 "Duplicate ACPI video bus devices for the"
1748 " same VGA controller, please try module "
1749 "parameter \"video.allow_duplicates=1\""
1750 "if the current driver doesn't work.\n");
1751 if (!allow_duplicates)
1755 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1759 /* a hack to fix the duplicate name "VID" problem on T61 */
1760 if (!strcmp(device->pnp.bus_id, "VID")) {
1762 device->pnp.bus_id[3] = '0' + instance;
1765 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1766 if (!strcmp(device->pnp.bus_id, "VGA")) {
1768 device->pnp.bus_id[3] = '0' + instance;
1772 video->device = device;
1773 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1774 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1775 device->driver_data = video;
1777 acpi_video_bus_find_cap(video);
1778 error = acpi_video_bus_check(video);
1780 goto err_free_video;
1782 mutex_init(&video->device_list_lock);
1783 INIT_LIST_HEAD(&video->video_device_list);
1785 error = acpi_video_bus_get_devices(video, device);
1789 video->input = input = input_allocate_device();
1795 error = acpi_video_bus_start_devices(video);
1797 goto err_free_input_dev;
1799 snprintf(video->phys, sizeof(video->phys),
1800 "%s/video/input0", acpi_device_hid(video->device));
1802 input->name = acpi_device_name(video->device);
1803 input->phys = video->phys;
1804 input->id.bustype = BUS_HOST;
1805 input->id.product = 0x06;
1806 input->dev.parent = &device->dev;
1807 input->evbit[0] = BIT(EV_KEY);
1808 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1809 set_bit(KEY_VIDEO_NEXT, input->keybit);
1810 set_bit(KEY_VIDEO_PREV, input->keybit);
1811 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1812 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1813 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1814 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1815 set_bit(KEY_DISPLAY_OFF, input->keybit);
1817 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1818 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1819 video->flags.multihead ? "yes" : "no",
1820 video->flags.rom ? "yes" : "no",
1821 video->flags.post ? "yes" : "no");
1823 video->pm_nb.notifier_call = acpi_video_resume;
1824 video->pm_nb.priority = 0;
1825 error = register_pm_notifier(&video->pm_nb);
1827 goto err_stop_video;
1829 error = input_register_device(input);
1831 goto err_unregister_pm_notifier;
1835 err_unregister_pm_notifier:
1836 unregister_pm_notifier(&video->pm_nb);
1838 acpi_video_bus_stop_devices(video);
1840 input_free_device(input);
1842 acpi_video_bus_put_devices(video);
1843 kfree(video->attached_array);
1846 device->driver_data = NULL;
1851 static int acpi_video_bus_remove(struct acpi_device *device)
1853 struct acpi_video_bus *video = NULL;
1856 if (!device || !acpi_driver_data(device))
1859 video = acpi_driver_data(device);
1861 unregister_pm_notifier(&video->pm_nb);
1863 acpi_video_bus_stop_devices(video);
1864 acpi_video_bus_put_devices(video);
1866 input_unregister_device(video->input);
1867 kfree(video->attached_array);
1873 static int __init is_i740(struct pci_dev *dev)
1875 if (dev->device == 0x00D1)
1877 if (dev->device == 0x7000)
1882 static int __init intel_opregion_present(void)
1885 struct pci_dev *dev = NULL;
1888 for_each_pci_dev(dev) {
1889 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1891 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1893 /* We don't want to poke around undefined i740 registers */
1896 pci_read_config_dword(dev, 0xfc, &address);
1904 int acpi_video_register(void)
1907 if (register_count) {
1909 * if the function of acpi_video_register is already called,
1910 * don't register the acpi_vide_bus again and return no error.
1915 result = acpi_bus_register_driver(&acpi_video_bus);
1920 * When the acpi_video_bus is loaded successfully, increase
1921 * the counter reference.
1927 EXPORT_SYMBOL(acpi_video_register);
1929 void acpi_video_unregister(void)
1931 if (!register_count) {
1933 * If the acpi video bus is already unloaded, don't
1934 * unload it again and return directly.
1938 acpi_bus_unregister_driver(&acpi_video_bus);
1944 EXPORT_SYMBOL(acpi_video_unregister);
1947 * This is kind of nasty. Hardware using Intel chipsets may require
1948 * the video opregion code to be run first in order to initialise
1949 * state before any ACPI video calls are made. To handle this we defer
1950 * registration of the video class until the opregion code has run.
1953 static int __init acpi_video_init(void)
1955 dmi_check_system(video_dmi_table);
1957 if (intel_opregion_present())
1960 return acpi_video_register();
1963 static void __exit acpi_video_exit(void)
1965 acpi_video_unregister();
1970 module_init(acpi_video_init);
1971 module_exit(acpi_video_exit);