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>
47 #define PREFIX "ACPI: "
49 #define ACPI_VIDEO_BUS_NAME "Video Bus"
50 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
51 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
52 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
53 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63 #define MAX_NAME_LEN 20
65 #define _COMPONENT ACPI_VIDEO_COMPONENT
66 ACPI_MODULE_NAME("video");
68 MODULE_AUTHOR("Bruno Ducrot");
69 MODULE_DESCRIPTION("ACPI Video Driver");
70 MODULE_LICENSE("GPL");
72 static bool brightness_switch_enabled = 1;
73 module_param(brightness_switch_enabled, bool, 0644);
76 * By default, we don't allow duplicate ACPI video bus devices
77 * under the same VGA controller
79 static bool allow_duplicates;
80 module_param(allow_duplicates, bool, 0644);
83 * Some BIOSes claim they use minimum backlight at boot,
84 * and this may bring dimming screen after boot
86 static bool use_bios_initial_backlight = 1;
87 module_param(use_bios_initial_backlight, bool, 0644);
89 static int register_count = 0;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
94 static const struct acpi_device_id video_device_ids[] = {
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100 static struct acpi_driver acpi_video_bus = {
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .notify = acpi_video_bus_notify,
111 struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
118 struct acpi_video_bus_cap {
119 u8 _DOS:1; /*Enable/Disable output switching */
120 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /*Get ROM Data */
122 u8 _GPD:1; /*Get POST Device */
123 u8 _SPD:1; /*Set POST Device */
124 u8 _VPO:1; /*Video POST Options */
128 struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /*This field differentiates the display type */
131 u32 display_type:4; /*Describe the specific type in use */
132 u32 vendor_specific:4; /*Chipset Vendor Specific */
133 u32 bios_can_detect:1; /*BIOS can detect the device */
134 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
136 u32 pipe_id:3; /*For VGA multiple-head devices. */
137 u32 reserved:10; /*Must be 0 */
138 u32 device_id_scheme:1; /*Device ID Scheme */
141 struct acpi_video_enumerated_device {
144 struct acpi_video_device_attrib attrib;
146 struct acpi_video_device *bind_info;
149 struct acpi_video_bus {
150 struct acpi_device *device;
152 struct acpi_video_enumerated_device *attached_array;
154 struct acpi_video_bus_cap cap;
155 struct acpi_video_bus_flags flags;
156 struct list_head video_device_list;
157 struct mutex device_list_lock; /* protects video_device_list */
158 struct input_dev *input;
159 char phys[32]; /* for input device */
160 struct notifier_block pm_nb;
163 struct acpi_video_device_flags {
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /*Return the unique ID */
176 u8 _BCL:1; /*Query list of brightness control levels supported */
177 u8 _BCM:1; /*Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /*Return the EDID for this device */
183 struct acpi_video_brightness_flags {
184 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
185 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
186 u8 _BCL_use_index:1; /* levels in _BCL are index values */
187 u8 _BCM_use_index:1; /* input of _BCM is an index value */
188 u8 _BQC_use_index:1; /* _BQC returns an index value */
191 struct acpi_video_device_brightness {
195 struct acpi_video_brightness_flags flags;
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct acpi_video_bus *video;
204 struct acpi_device *dev;
205 struct acpi_video_device_brightness *brightness;
206 struct backlight_device *backlight;
207 struct thermal_cooling_device *cooling_dev;
210 static const char device_decode[][30] = {
211 "motherboard VGA device",
217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
219 static void acpi_video_device_bind(struct acpi_video_bus *video,
220 struct acpi_video_device *device);
221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
224 static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device *device,
226 unsigned long long *level, bool raw);
227 static int acpi_video_get_next_level(struct acpi_video_device *device,
228 u32 level_current, u32 event);
229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
232 /*backlight device sysfs support*/
233 static int acpi_video_get_brightness(struct backlight_device *bd)
235 unsigned long long cur_level;
237 struct acpi_video_device *vd =
238 (struct acpi_video_device *)bl_get_data(bd);
240 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
242 for (i = 2; i < vd->brightness->count; i++) {
243 if (vd->brightness->levels[i] == cur_level)
244 /* The first two entries are special - see page 575
245 of the ACPI spec 3.0 */
251 static int acpi_video_set_brightness(struct backlight_device *bd)
253 int request_level = bd->props.brightness + 2;
254 struct acpi_video_device *vd =
255 (struct acpi_video_device *)bl_get_data(bd);
257 return acpi_video_device_lcd_set_level(vd,
258 vd->brightness->levels[request_level]);
261 static const struct backlight_ops acpi_backlight_ops = {
262 .get_brightness = acpi_video_get_brightness,
263 .update_status = acpi_video_set_brightness,
266 /* thermal cooling device callbacks */
267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
270 struct acpi_device *device = cooling_dev->devdata;
271 struct acpi_video_device *video = acpi_driver_data(device);
273 *state = video->brightness->count - 3;
277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
280 struct acpi_device *device = cooling_dev->devdata;
281 struct acpi_video_device *video = acpi_driver_data(device);
282 unsigned long long level;
285 if (acpi_video_device_lcd_get_level_current(video, &level, false))
287 for (offset = 2; offset < video->brightness->count; offset++)
288 if (level == video->brightness->levels[offset]) {
289 *state = video->brightness->count - offset - 1;
297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
299 struct acpi_device *device = cooling_dev->devdata;
300 struct acpi_video_device *video = acpi_driver_data(device);
303 if ( state >= video->brightness->count - 2)
306 state = video->brightness->count - state;
307 level = video->brightness->levels[state -1];
308 return acpi_video_device_lcd_set_level(video, level);
311 static const struct thermal_cooling_device_ops video_cooling_ops = {
312 .get_max_state = video_get_max_state,
313 .get_cur_state = video_get_cur_state,
314 .set_cur_state = video_set_cur_state,
317 /* --------------------------------------------------------------------------
319 -------------------------------------------------------------------------- */
322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
323 union acpi_object **levels)
326 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
327 union acpi_object *obj;
332 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
333 if (!ACPI_SUCCESS(status))
335 obj = (union acpi_object *)buffer.pointer;
336 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
337 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
347 kfree(buffer.pointer);
353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
356 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
357 struct acpi_object_list args = { 1, &arg0 };
360 arg0.integer.value = level;
362 status = acpi_evaluate_object(device->dev->handle, "_BCM",
364 if (ACPI_FAILURE(status)) {
365 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
369 device->brightness->curr = level;
370 for (state = 2; state < device->brightness->count; state++)
371 if (level == device->brightness->levels[state]) {
372 if (device->backlight)
373 device->backlight->props.brightness = state - 2;
377 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
382 * For some buggy _BQC methods, we need to add a constant value to
383 * the _BQC return value to get the actual current brightness level
386 static int bqc_offset_aml_bug_workaround;
387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
389 bqc_offset_aml_bug_workaround = 9;
393 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
395 use_bios_initial_backlight = 0;
399 static struct dmi_system_id video_dmi_table[] __initdata = {
401 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
404 .callback = video_set_bqc_offset,
405 .ident = "Acer Aspire 5720",
407 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
408 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
412 .callback = video_set_bqc_offset,
413 .ident = "Acer Aspire 5710Z",
415 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
416 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
420 .callback = video_set_bqc_offset,
421 .ident = "eMachines E510",
423 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5315",
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
436 .callback = video_set_bqc_offset,
437 .ident = "Acer Aspire 7720",
439 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
444 .callback = video_ignore_initial_backlight,
445 .ident = "HP Folio 13-2000",
447 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
452 .callback = video_ignore_initial_backlight,
453 .ident = "Fujitsu E753",
455 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
460 .callback = video_ignore_initial_backlight,
461 .ident = "HP Pavilion dm4",
463 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
468 .callback = video_ignore_initial_backlight,
469 .ident = "HP Pavilion g6 Notebook PC",
471 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
476 .callback = video_ignore_initial_backlight,
477 .ident = "HP 1000 Notebook PC",
479 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
484 .callback = video_ignore_initial_backlight,
485 .ident = "HP Pavilion m4",
487 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
488 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
494 static unsigned long long
495 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
496 unsigned long long bqc_value)
498 unsigned long long level;
500 if (device->brightness->flags._BQC_use_index) {
502 * _BQC returns an index that doesn't account for
503 * the first 2 items with special meaning, so we need
504 * to compensate for that by offsetting ourselves
506 if (device->brightness->flags._BCL_reversed)
507 bqc_value = device->brightness->count - 3 - bqc_value;
509 level = device->brightness->levels[bqc_value + 2];
514 level += bqc_offset_aml_bug_workaround;
520 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
521 unsigned long long *level, bool raw)
523 acpi_status status = AE_OK;
526 if (device->cap._BQC || device->cap._BCQ) {
527 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
529 status = acpi_evaluate_integer(device->dev->handle, buf,
531 if (ACPI_SUCCESS(status)) {
534 * Caller has indicated he wants the raw
535 * value returned by _BQC, so don't furtherly
536 * mess with the value.
541 *level = acpi_video_bqc_value_to_level(device, *level);
543 for (i = 2; i < device->brightness->count; i++)
544 if (device->brightness->levels[i] == *level) {
545 device->brightness->curr = *level;
549 * BQC returned an invalid level.
552 ACPI_WARNING((AE_INFO,
553 "%s returned an invalid level",
555 device->cap._BQC = device->cap._BCQ = 0;
558 * should we return an error or ignore this failure?
559 * dev->brightness->curr is a cached value which stores
560 * the correct current backlight level in most cases.
561 * ACPI video backlight still works w/ buggy _BQC.
562 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
564 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
565 device->cap._BQC = device->cap._BCQ = 0;
569 *level = device->brightness->curr;
574 acpi_video_device_EDID(struct acpi_video_device *device,
575 union acpi_object **edid, ssize_t length)
578 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
579 union acpi_object *obj;
580 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
581 struct acpi_object_list args = { 1, &arg0 };
589 arg0.integer.value = 1;
590 else if (length == 256)
591 arg0.integer.value = 2;
595 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
596 if (ACPI_FAILURE(status))
599 obj = buffer.pointer;
601 if (obj && obj->type == ACPI_TYPE_BUFFER)
604 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
616 * video : video bus device pointer
618 * 0. The system BIOS should NOT automatically switch(toggle)
619 * the active display output.
620 * 1. The system BIOS should automatically switch (toggle) the
621 * active display output. No switch event.
622 * 2. The _DGS value should be locked.
623 * 3. The system BIOS should not automatically switch (toggle) the
624 * active display output, but instead generate the display switch
627 * 0. The system BIOS should automatically control the brightness level
628 * of the LCD when the power changes from AC to DC
629 * 1. The system BIOS should NOT automatically control the brightness
630 * level of the LCD when the power changes from AC to DC.
636 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
639 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
640 struct acpi_object_list args = { 1, &arg0 };
642 if (!video->cap._DOS)
645 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
647 arg0.integer.value = (lcd_flag << 2) | bios_flag;
648 video->dos_setting = arg0.integer.value;
649 status = acpi_evaluate_object(video->device->handle, "_DOS",
651 if (ACPI_FAILURE(status))
658 * Simple comparison function used to sort backlight levels.
662 acpi_video_cmp_level(const void *a, const void *b)
664 return *(int *)a - *(int *)b;
668 * Decides if _BQC/_BCQ for this system is usable
670 * We do this by changing the level first and then read out the current
671 * brightness level, if the value does not match, find out if it is using
672 * index. If not, clear the _BQC/_BCQ capability.
674 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
675 int max_level, int current_level)
677 struct acpi_video_device_brightness *br = device->brightness;
679 unsigned long long level;
682 /* don't mess with existing known broken systems */
683 if (bqc_offset_aml_bug_workaround)
687 * Some systems always report current brightness level as maximum
688 * through _BQC, we need to test another value for them.
690 test_level = current_level == max_level ? br->levels[2] : max_level;
692 result = acpi_video_device_lcd_set_level(device, test_level);
696 result = acpi_video_device_lcd_get_level_current(device, &level, true);
700 if (level != test_level) {
701 /* buggy _BQC found, need to find out if it uses index */
702 if (level < br->count) {
703 if (br->flags._BCL_reversed)
704 level = br->count - 3 - level;
705 if (br->levels[level + 2] == test_level)
706 br->flags._BQC_use_index = 1;
709 if (!br->flags._BQC_use_index)
710 device->cap._BQC = device->cap._BCQ = 0;
719 * device : video output device (LCD, CRT, ..)
722 * Maximum brightness level
724 * Allocate and initialize device->brightness.
728 acpi_video_init_brightness(struct acpi_video_device *device)
730 union acpi_object *obj = NULL;
731 int i, max_level = 0, count = 0, level_ac_battery = 0;
732 unsigned long long level, level_old;
733 union acpi_object *o;
734 struct acpi_video_device_brightness *br = NULL;
735 int result = -EINVAL;
737 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
738 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
739 "LCD brightness level\n"));
743 if (obj->package.count < 2)
746 br = kzalloc(sizeof(*br), GFP_KERNEL);
748 printk(KERN_ERR "can't allocate memory\n");
753 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
760 for (i = 0; i < obj->package.count; i++) {
761 o = (union acpi_object *)&obj->package.elements[i];
762 if (o->type != ACPI_TYPE_INTEGER) {
763 printk(KERN_ERR PREFIX "Invalid data\n");
766 br->levels[count] = (u32) o->integer.value;
768 if (br->levels[count] > max_level)
769 max_level = br->levels[count];
774 * some buggy BIOS don't export the levels
775 * when machine is on AC/Battery in _BCL package.
776 * In this case, the first two elements in _BCL packages
777 * are also supported brightness levels that OS should take care of.
779 for (i = 2; i < count; i++) {
780 if (br->levels[i] == br->levels[0])
782 if (br->levels[i] == br->levels[1])
786 if (level_ac_battery < 2) {
787 level_ac_battery = 2 - level_ac_battery;
788 br->flags._BCL_no_ac_battery_levels = 1;
789 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
790 br->levels[i] = br->levels[i - level_ac_battery];
791 count += level_ac_battery;
792 } else if (level_ac_battery > 2)
793 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
795 /* Check if the _BCL package is in a reversed order */
796 if (max_level == br->levels[2]) {
797 br->flags._BCL_reversed = 1;
798 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
799 acpi_video_cmp_level, NULL);
800 } else if (max_level != br->levels[count - 1])
802 "Found unordered _BCL package"));
805 device->brightness = br;
807 /* Check the input/output of _BQC/_BCL/_BCM */
808 if ((max_level < 100) && (max_level <= (count - 2)))
809 br->flags._BCL_use_index = 1;
812 * _BCM is always consistent with _BCL,
813 * at least for all the laptops we have ever seen.
815 br->flags._BCM_use_index = br->flags._BCL_use_index;
817 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
818 br->curr = level = max_level;
820 if (!device->cap._BQC)
823 result = acpi_video_device_lcd_get_level_current(device,
826 goto out_free_levels;
828 result = acpi_video_bqc_quirk(device, max_level, level_old);
830 goto out_free_levels;
832 * cap._BQC may get cleared due to _BQC is found to be broken
833 * in acpi_video_bqc_quirk, so check again here.
835 if (!device->cap._BQC)
838 if (use_bios_initial_backlight) {
839 level = acpi_video_bqc_value_to_level(device, level_old);
841 * On some buggy laptops, _BQC returns an uninitialized
842 * value when invoked for the first time, i.e.
843 * level_old is invalid (no matter whether it's a level
844 * or an index). Set the backlight to max_level in this case.
846 for (i = 2; i < br->count; i++)
847 if (level_old == br->levels[i])
849 if (i == br->count || !level)
854 result = acpi_video_device_lcd_set_level(device, level);
856 goto out_free_levels;
858 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
859 "found %d brightness levels\n", count - 2));
868 device->brightness = NULL;
875 * device : video output device (LCD, CRT, ..)
880 * Find out all required AML methods defined under the output
884 static void acpi_video_device_find_cap(struct acpi_video_device *device)
886 acpi_handle h_dummy1;
888 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
889 device->cap._ADR = 1;
891 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
892 device->cap._BCL = 1;
894 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
895 device->cap._BCM = 1;
897 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
898 device->cap._BQC = 1;
899 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
901 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
902 device->cap._BCQ = 1;
905 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
906 device->cap._DDC = 1;
909 if (acpi_video_backlight_support()) {
910 struct backlight_properties props;
911 struct pci_dev *pdev;
912 acpi_handle acpi_parent;
913 struct device *parent = NULL;
915 static int count = 0;
918 result = acpi_video_init_brightness(device);
921 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
926 acpi_get_parent(device->dev->handle, &acpi_parent);
928 pdev = acpi_get_pci_dev(acpi_parent);
934 memset(&props, 0, sizeof(struct backlight_properties));
935 props.type = BACKLIGHT_FIRMWARE;
936 props.max_brightness = device->brightness->count - 3;
937 device->backlight = backlight_device_register(name,
943 if (IS_ERR(device->backlight))
947 * Save current brightness level in case we have to restore it
948 * before acpi_video_device_lcd_set_level() is called next time.
950 device->backlight->props.brightness =
951 acpi_video_get_brightness(device->backlight);
953 device->cooling_dev = thermal_cooling_device_register("LCD",
954 device->dev, &video_cooling_ops);
955 if (IS_ERR(device->cooling_dev)) {
957 * Set cooling_dev to NULL so we don't crash trying to
959 * Also, why the hell we are returning early and
960 * not attempt to register video output if cooling
961 * device registration failed?
964 device->cooling_dev = NULL;
968 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
969 device->cooling_dev->id);
970 result = sysfs_create_link(&device->dev->dev.kobj,
971 &device->cooling_dev->device.kobj,
974 printk(KERN_ERR PREFIX "Create sysfs link\n");
975 result = sysfs_create_link(&device->cooling_dev->device.kobj,
976 &device->dev->dev.kobj, "device");
978 printk(KERN_ERR PREFIX "Create sysfs link\n");
985 * device : video output device (VGA)
990 * Find out all required AML methods defined under the video bus device.
993 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
995 acpi_handle h_dummy1;
997 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1000 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1001 video->cap._DOD = 1;
1003 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1004 video->cap._ROM = 1;
1006 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1007 video->cap._GPD = 1;
1009 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1010 video->cap._SPD = 1;
1012 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1013 video->cap._VPO = 1;
1018 * Check whether the video bus device has required AML method to
1019 * support the desired features
1022 static int acpi_video_bus_check(struct acpi_video_bus *video)
1024 acpi_status status = -ENOENT;
1025 struct pci_dev *dev;
1030 dev = acpi_get_pci_dev(video->device->handle);
1035 /* Since there is no HID, CID and so on for VGA driver, we have
1036 * to check well known required nodes.
1039 /* Does this device support video switching? */
1040 if (video->cap._DOS || video->cap._DOD) {
1041 if (!video->cap._DOS) {
1042 printk(KERN_WARNING FW_BUG
1043 "ACPI(%s) defines _DOD but not _DOS\n",
1044 acpi_device_bid(video->device));
1046 video->flags.multihead = 1;
1050 /* Does this device support retrieving a video ROM? */
1051 if (video->cap._ROM) {
1052 video->flags.rom = 1;
1056 /* Does this device support configuring which video device to POST? */
1057 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1058 video->flags.post = 1;
1065 /* --------------------------------------------------------------------------
1067 -------------------------------------------------------------------------- */
1069 /* device interface */
1070 static struct acpi_video_device_attrib*
1071 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1073 struct acpi_video_enumerated_device *ids;
1076 for (i = 0; i < video->attached_count; i++) {
1077 ids = &video->attached_array[i];
1078 if ((ids->value.int_val & 0xffff) == device_id)
1079 return &ids->value.attrib;
1086 acpi_video_get_device_type(struct acpi_video_bus *video,
1087 unsigned long device_id)
1089 struct acpi_video_enumerated_device *ids;
1092 for (i = 0; i < video->attached_count; i++) {
1093 ids = &video->attached_array[i];
1094 if ((ids->value.int_val & 0xffff) == device_id)
1095 return ids->value.int_val;
1102 acpi_video_bus_get_one_device(struct acpi_device *device,
1103 struct acpi_video_bus *video)
1105 unsigned long long device_id;
1106 int status, device_type;
1107 struct acpi_video_device *data;
1108 struct acpi_video_device_attrib* attribute;
1111 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1112 /* Some device omits _ADR, we skip them instead of fail */
1113 if (ACPI_FAILURE(status))
1116 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1120 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1121 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1122 device->driver_data = data;
1124 data->device_id = device_id;
1125 data->video = video;
1128 attribute = acpi_video_get_device_attr(video, device_id);
1130 if((attribute != NULL) && attribute->device_id_scheme) {
1131 switch (attribute->display_type) {
1132 case ACPI_VIDEO_DISPLAY_CRT:
1133 data->flags.crt = 1;
1135 case ACPI_VIDEO_DISPLAY_TV:
1136 data->flags.tvout = 1;
1138 case ACPI_VIDEO_DISPLAY_DVI:
1139 data->flags.dvi = 1;
1141 case ACPI_VIDEO_DISPLAY_LCD:
1142 data->flags.lcd = 1;
1145 data->flags.unknown = 1;
1148 if(attribute->bios_can_detect)
1149 data->flags.bios = 1;
1151 /* Check for legacy IDs */
1152 device_type = acpi_video_get_device_type(video, device_id);
1153 /* Ignore bits 16 and 18-20 */
1154 switch (device_type & 0xffe2ffff) {
1155 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1156 data->flags.crt = 1;
1158 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1159 data->flags.lcd = 1;
1161 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1162 data->flags.tvout = 1;
1165 data->flags.unknown = 1;
1169 acpi_video_device_bind(video, data);
1170 acpi_video_device_find_cap(data);
1172 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1173 acpi_video_device_notify, data);
1174 if (ACPI_FAILURE(status))
1175 dev_err(&device->dev, "Error installing notify handler\n");
1177 data->flags.notify = 1;
1179 mutex_lock(&video->device_list_lock);
1180 list_add_tail(&data->entry, &video->video_device_list);
1181 mutex_unlock(&video->device_list_lock);
1188 * video : video bus device
1193 * Enumerate the video device list of the video bus,
1194 * bind the ids with the corresponding video devices
1195 * under the video bus.
1198 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1200 struct acpi_video_device *dev;
1202 mutex_lock(&video->device_list_lock);
1204 list_for_each_entry(dev, &video->video_device_list, entry)
1205 acpi_video_device_bind(video, dev);
1207 mutex_unlock(&video->device_list_lock);
1212 * video : video bus device
1213 * device : video output device under the video
1219 * Bind the ids with the corresponding video devices
1220 * under the video bus.
1224 acpi_video_device_bind(struct acpi_video_bus *video,
1225 struct acpi_video_device *device)
1227 struct acpi_video_enumerated_device *ids;
1230 for (i = 0; i < video->attached_count; i++) {
1231 ids = &video->attached_array[i];
1232 if (device->device_id == (ids->value.int_val & 0xffff)) {
1233 ids->bind_info = device;
1234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1241 * video : video bus device
1246 * Call _DOD to enumerate all devices attached to display adapter
1250 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1255 struct acpi_video_enumerated_device *active_list;
1256 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1257 union acpi_object *dod = NULL;
1258 union acpi_object *obj;
1260 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1261 if (!ACPI_SUCCESS(status)) {
1262 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1266 dod = buffer.pointer;
1267 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1268 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1274 dod->package.count));
1276 active_list = kcalloc(1 + dod->package.count,
1277 sizeof(struct acpi_video_enumerated_device),
1285 for (i = 0; i < dod->package.count; i++) {
1286 obj = &dod->package.elements[i];
1288 if (obj->type != ACPI_TYPE_INTEGER) {
1289 printk(KERN_ERR PREFIX
1290 "Invalid _DOD data in element %d\n", i);
1294 active_list[count].value.int_val = obj->integer.value;
1295 active_list[count].bind_info = NULL;
1296 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1297 (int)obj->integer.value));
1301 kfree(video->attached_array);
1303 video->attached_array = active_list;
1304 video->attached_count = count;
1307 kfree(buffer.pointer);
1312 acpi_video_get_next_level(struct acpi_video_device *device,
1313 u32 level_current, u32 event)
1315 int min, max, min_above, max_below, i, l, delta = 255;
1316 max = max_below = 0;
1317 min = min_above = 255;
1318 /* Find closest level to level_current */
1319 for (i = 2; i < device->brightness->count; i++) {
1320 l = device->brightness->levels[i];
1321 if (abs(l - level_current) < abs(delta)) {
1322 delta = l - level_current;
1327 /* Ajust level_current to closest available level */
1328 level_current += delta;
1329 for (i = 2; i < device->brightness->count; i++) {
1330 l = device->brightness->levels[i];
1335 if (l < min_above && l > level_current)
1337 if (l > max_below && l < level_current)
1342 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1343 return (level_current < max) ? min_above : min;
1344 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1345 return (level_current < max) ? min_above : max;
1346 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1347 return (level_current > min) ? max_below : min;
1348 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1349 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1352 return level_current;
1357 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1359 unsigned long long level_current, level_next;
1360 int result = -EINVAL;
1362 /* no warning message if acpi_backlight=vendor is used */
1363 if (!acpi_video_backlight_support())
1366 if (!device->brightness)
1369 result = acpi_video_device_lcd_get_level_current(device,
1375 level_next = acpi_video_get_next_level(device, level_current, event);
1377 result = acpi_video_device_lcd_set_level(device, level_next);
1380 backlight_force_update(device->backlight,
1381 BACKLIGHT_UPDATE_HOTKEY);
1385 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1390 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1393 struct acpi_video_bus *video;
1394 struct acpi_video_device *video_device;
1395 union acpi_object *buffer = NULL;
1399 if (!device || !acpi_driver_data(device))
1402 video = acpi_driver_data(device);
1404 for (i = 0; i < video->attached_count; i++) {
1405 video_device = video->attached_array[i].bind_info;
1411 if (!video_device->cap._DDC)
1416 case ACPI_VIDEO_DISPLAY_CRT:
1417 if (!video_device->flags.crt)
1420 case ACPI_VIDEO_DISPLAY_TV:
1421 if (!video_device->flags.tvout)
1424 case ACPI_VIDEO_DISPLAY_DVI:
1425 if (!video_device->flags.dvi)
1428 case ACPI_VIDEO_DISPLAY_LCD:
1429 if (!video_device->flags.lcd)
1433 } else if (video_device->device_id != device_id) {
1437 status = acpi_video_device_EDID(video_device, &buffer, length);
1439 if (ACPI_FAILURE(status) || !buffer ||
1440 buffer->type != ACPI_TYPE_BUFFER) {
1442 status = acpi_video_device_EDID(video_device, &buffer,
1444 if (ACPI_FAILURE(status) || !buffer ||
1445 buffer->type != ACPI_TYPE_BUFFER) {
1450 *edid = buffer->buffer.pointer;
1456 EXPORT_SYMBOL(acpi_video_get_edid);
1459 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1460 struct acpi_device *device)
1463 struct acpi_device *dev;
1466 * There are systems where video module known to work fine regardless
1467 * of broken _DOD and ignoring returned value here doesn't cause
1470 acpi_video_device_enumerate(video);
1472 list_for_each_entry(dev, &device->children, node) {
1474 status = acpi_video_bus_get_one_device(dev, video);
1476 dev_err(&dev->dev, "Can't attach device\n");
1483 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1487 if (!device || !device->video)
1490 if (device->flags.notify) {
1491 status = acpi_remove_notify_handler(device->dev->handle,
1492 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1493 if (ACPI_FAILURE(status))
1494 dev_err(&device->dev->dev,
1495 "Can't remove video notify handler\n");
1498 if (device->backlight) {
1499 backlight_device_unregister(device->backlight);
1500 device->backlight = NULL;
1502 if (device->cooling_dev) {
1503 sysfs_remove_link(&device->dev->dev.kobj,
1505 sysfs_remove_link(&device->cooling_dev->device.kobj,
1507 thermal_cooling_device_unregister(device->cooling_dev);
1508 device->cooling_dev = NULL;
1514 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1517 struct acpi_video_device *dev, *next;
1519 mutex_lock(&video->device_list_lock);
1521 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1523 status = acpi_video_bus_put_one_device(dev);
1524 if (ACPI_FAILURE(status))
1525 printk(KERN_WARNING PREFIX
1526 "hhuuhhuu bug in acpi video driver.\n");
1528 if (dev->brightness) {
1529 kfree(dev->brightness->levels);
1530 kfree(dev->brightness);
1532 list_del(&dev->entry);
1536 mutex_unlock(&video->device_list_lock);
1541 /* acpi_video interface */
1543 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1545 return acpi_video_bus_DOS(video, 0, 0);
1548 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1550 return acpi_video_bus_DOS(video, 0, 1);
1553 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1555 struct acpi_video_bus *video = acpi_driver_data(device);
1556 struct input_dev *input;
1562 input = video->input;
1565 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1566 * most likely via hotkey. */
1567 acpi_bus_generate_proc_event(device, event, 0);
1568 keycode = KEY_SWITCHVIDEOMODE;
1571 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1573 acpi_video_device_enumerate(video);
1574 acpi_video_device_rebind(video);
1575 acpi_bus_generate_proc_event(device, event, 0);
1576 keycode = KEY_SWITCHVIDEOMODE;
1579 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1580 acpi_bus_generate_proc_event(device, event, 0);
1581 keycode = KEY_SWITCHVIDEOMODE;
1583 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1584 acpi_bus_generate_proc_event(device, event, 0);
1585 keycode = KEY_VIDEO_NEXT;
1587 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1588 acpi_bus_generate_proc_event(device, event, 0);
1589 keycode = KEY_VIDEO_PREV;
1593 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1594 "Unsupported event [0x%x]\n", event));
1598 if (acpi_notifier_call_chain(device, event, 0))
1599 /* Something vetoed the keypress. */
1603 input_report_key(input, keycode, 1);
1605 input_report_key(input, keycode, 0);
1612 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1614 struct acpi_video_device *video_device = data;
1615 struct acpi_device *device = NULL;
1616 struct acpi_video_bus *bus;
1617 struct input_dev *input;
1623 device = video_device->dev;
1624 bus = video_device->video;
1628 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1629 if (brightness_switch_enabled)
1630 acpi_video_switch_brightness(video_device, event);
1631 acpi_bus_generate_proc_event(device, event, 0);
1632 keycode = KEY_BRIGHTNESS_CYCLE;
1634 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1635 if (brightness_switch_enabled)
1636 acpi_video_switch_brightness(video_device, event);
1637 acpi_bus_generate_proc_event(device, event, 0);
1638 keycode = KEY_BRIGHTNESSUP;
1640 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1641 if (brightness_switch_enabled)
1642 acpi_video_switch_brightness(video_device, event);
1643 acpi_bus_generate_proc_event(device, event, 0);
1644 keycode = KEY_BRIGHTNESSDOWN;
1646 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1647 if (brightness_switch_enabled)
1648 acpi_video_switch_brightness(video_device, event);
1649 acpi_bus_generate_proc_event(device, event, 0);
1650 keycode = KEY_BRIGHTNESS_ZERO;
1652 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1653 if (brightness_switch_enabled)
1654 acpi_video_switch_brightness(video_device, event);
1655 acpi_bus_generate_proc_event(device, event, 0);
1656 keycode = KEY_DISPLAY_OFF;
1659 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1660 "Unsupported event [0x%x]\n", event));
1664 acpi_notifier_call_chain(device, event, 0);
1667 input_report_key(input, keycode, 1);
1669 input_report_key(input, keycode, 0);
1676 static int acpi_video_resume(struct notifier_block *nb,
1677 unsigned long val, void *ign)
1679 struct acpi_video_bus *video;
1680 struct acpi_video_device *video_device;
1684 case PM_HIBERNATION_PREPARE:
1685 case PM_SUSPEND_PREPARE:
1686 case PM_RESTORE_PREPARE:
1690 video = container_of(nb, struct acpi_video_bus, pm_nb);
1692 dev_info(&video->device->dev, "Restoring backlight state\n");
1694 for (i = 0; i < video->attached_count; i++) {
1695 video_device = video->attached_array[i].bind_info;
1696 if (video_device && video_device->backlight)
1697 acpi_video_set_brightness(video_device->backlight);
1704 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1705 void **return_value)
1707 struct acpi_device *device = context;
1708 struct acpi_device *sibling;
1711 if (handle == device->handle)
1712 return AE_CTRL_TERMINATE;
1714 result = acpi_bus_get_device(handle, &sibling);
1718 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1719 return AE_ALREADY_EXISTS;
1724 static int instance;
1726 static int acpi_video_bus_add(struct acpi_device *device)
1728 struct acpi_video_bus *video;
1729 struct input_dev *input;
1733 if (device->handler)
1736 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1737 device->parent->handle, 1,
1738 acpi_video_bus_match, NULL,
1740 if (status == AE_ALREADY_EXISTS) {
1741 printk(KERN_WARNING FW_BUG
1742 "Duplicate ACPI video bus devices for the"
1743 " same VGA controller, please try module "
1744 "parameter \"video.allow_duplicates=1\""
1745 "if the current driver doesn't work.\n");
1746 if (!allow_duplicates)
1750 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1754 /* a hack to fix the duplicate name "VID" problem on T61 */
1755 if (!strcmp(device->pnp.bus_id, "VID")) {
1757 device->pnp.bus_id[3] = '0' + instance;
1760 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1761 if (!strcmp(device->pnp.bus_id, "VGA")) {
1763 device->pnp.bus_id[3] = '0' + instance;
1767 video->device = device;
1768 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1769 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1770 device->driver_data = video;
1772 acpi_video_bus_find_cap(video);
1773 error = acpi_video_bus_check(video);
1775 goto err_free_video;
1777 mutex_init(&video->device_list_lock);
1778 INIT_LIST_HEAD(&video->video_device_list);
1780 error = acpi_video_bus_get_devices(video, device);
1784 video->input = input = input_allocate_device();
1790 error = acpi_video_bus_start_devices(video);
1792 goto err_free_input_dev;
1794 snprintf(video->phys, sizeof(video->phys),
1795 "%s/video/input0", acpi_device_hid(video->device));
1797 input->name = acpi_device_name(video->device);
1798 input->phys = video->phys;
1799 input->id.bustype = BUS_HOST;
1800 input->id.product = 0x06;
1801 input->dev.parent = &device->dev;
1802 input->evbit[0] = BIT(EV_KEY);
1803 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1804 set_bit(KEY_VIDEO_NEXT, input->keybit);
1805 set_bit(KEY_VIDEO_PREV, input->keybit);
1806 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1807 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1808 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1809 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1810 set_bit(KEY_DISPLAY_OFF, input->keybit);
1812 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1813 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1814 video->flags.multihead ? "yes" : "no",
1815 video->flags.rom ? "yes" : "no",
1816 video->flags.post ? "yes" : "no");
1818 video->pm_nb.notifier_call = acpi_video_resume;
1819 video->pm_nb.priority = 0;
1820 error = register_pm_notifier(&video->pm_nb);
1822 goto err_stop_video;
1824 error = input_register_device(input);
1826 goto err_unregister_pm_notifier;
1830 err_unregister_pm_notifier:
1831 unregister_pm_notifier(&video->pm_nb);
1833 acpi_video_bus_stop_devices(video);
1835 input_free_device(input);
1837 acpi_video_bus_put_devices(video);
1838 kfree(video->attached_array);
1841 device->driver_data = NULL;
1846 static int acpi_video_bus_remove(struct acpi_device *device)
1848 struct acpi_video_bus *video = NULL;
1851 if (!device || !acpi_driver_data(device))
1854 video = acpi_driver_data(device);
1856 unregister_pm_notifier(&video->pm_nb);
1858 acpi_video_bus_stop_devices(video);
1859 acpi_video_bus_put_devices(video);
1861 input_unregister_device(video->input);
1862 kfree(video->attached_array);
1868 static int __init is_i740(struct pci_dev *dev)
1870 if (dev->device == 0x00D1)
1872 if (dev->device == 0x7000)
1877 static int __init intel_opregion_present(void)
1880 struct pci_dev *dev = NULL;
1883 for_each_pci_dev(dev) {
1884 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1886 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1888 /* We don't want to poke around undefined i740 registers */
1891 pci_read_config_dword(dev, 0xfc, &address);
1899 int acpi_video_register(void)
1902 if (register_count) {
1904 * if the function of acpi_video_register is already called,
1905 * don't register the acpi_vide_bus again and return no error.
1910 result = acpi_bus_register_driver(&acpi_video_bus);
1915 * When the acpi_video_bus is loaded successfully, increase
1916 * the counter reference.
1922 EXPORT_SYMBOL(acpi_video_register);
1924 void acpi_video_unregister(void)
1926 if (!register_count) {
1928 * If the acpi video bus is already unloaded, don't
1929 * unload it again and return directly.
1933 acpi_bus_unregister_driver(&acpi_video_bus);
1939 EXPORT_SYMBOL(acpi_video_unregister);
1942 * This is kind of nasty. Hardware using Intel chipsets may require
1943 * the video opregion code to be run first in order to initialise
1944 * state before any ACPI video calls are made. To handle this we defer
1945 * registration of the video class until the opregion code has run.
1948 static int __init acpi_video_init(void)
1950 dmi_check_system(video_dmi_table);
1952 if (intel_opregion_present())
1955 return acpi_video_register();
1958 static void __exit acpi_video_exit(void)
1960 acpi_video_unregister();
1965 module_init(acpi_video_init);
1966 module_exit(acpi_video_exit);