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>
46 #define PREFIX "ACPI: "
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
81 static int disable_backlight_sysfs_if = -1;
82 module_param(disable_backlight_sysfs_if, int, 0444);
84 static int register_count;
85 static DEFINE_MUTEX(register_count_mutex);
86 static struct mutex video_list_lock;
87 static struct list_head video_bus_head;
88 static int acpi_video_bus_add(struct acpi_device *device);
89 static int acpi_video_bus_remove(struct acpi_device *device);
90 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
91 void acpi_video_detect_exit(void);
93 static const struct acpi_device_id video_device_ids[] = {
97 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99 static struct acpi_driver acpi_video_bus = {
101 .class = ACPI_VIDEO_CLASS,
102 .ids = video_device_ids,
104 .add = acpi_video_bus_add,
105 .remove = acpi_video_bus_remove,
106 .notify = acpi_video_bus_notify,
110 struct acpi_video_bus_flags {
111 u8 multihead:1; /* can switch video heads */
112 u8 rom:1; /* can retrieve a video rom */
113 u8 post:1; /* can configure the head to */
117 struct acpi_video_bus_cap {
118 u8 _DOS:1; /* Enable/Disable output switching */
119 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
120 u8 _ROM:1; /* Get ROM Data */
121 u8 _GPD:1; /* Get POST Device */
122 u8 _SPD:1; /* Set POST Device */
123 u8 _VPO:1; /* Video POST Options */
127 struct acpi_video_device_attrib {
128 u32 display_index:4; /* A zero-based instance of the Display */
129 u32 display_port_attachment:4; /* This field differentiates the display type */
130 u32 display_type:4; /* Describe the specific type in use */
131 u32 vendor_specific:4; /* Chipset Vendor Specific */
132 u32 bios_can_detect:1; /* BIOS can detect the device */
133 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
135 u32 pipe_id:3; /* For VGA multiple-head devices. */
136 u32 reserved:10; /* Must be 0 */
137 u32 device_id_scheme:1; /* Device ID Scheme */
140 struct acpi_video_enumerated_device {
143 struct acpi_video_device_attrib attrib;
145 struct acpi_video_device *bind_info;
148 struct acpi_video_bus {
149 struct acpi_device *device;
150 bool backlight_registered;
152 struct acpi_video_enumerated_device *attached_array;
155 struct acpi_video_bus_cap cap;
156 struct acpi_video_bus_flags flags;
157 struct list_head video_device_list;
158 struct mutex device_list_lock; /* protects video_device_list */
159 struct list_head entry;
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 _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 delayed_work switch_brightness_work;
204 int switch_brightness_event;
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 void acpi_video_switch_brightness(struct work_struct *work);
233 /* backlight device sysfs support */
234 static int acpi_video_get_brightness(struct backlight_device *bd)
236 unsigned long long cur_level;
238 struct acpi_video_device *vd = 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)
245 * The first two entries are special - see page 575
246 * 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 = bl_get_data(bd);
258 cancel_delayed_work(&vd->switch_brightness_work);
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,
320 * --------------------------------------------------------------------------
322 * --------------------------------------------------------------------------
326 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
327 union acpi_object **levels)
330 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
331 union acpi_object *obj;
336 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
337 if (!ACPI_SUCCESS(status))
339 obj = (union acpi_object *)buffer.pointer;
340 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
341 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
351 kfree(buffer.pointer);
357 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
362 status = acpi_execute_simple_method(device->dev->handle,
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 video_set_bqc_offset(const struct dmi_system_id *d)
389 bqc_offset_aml_bug_workaround = 9;
393 static int video_disable_backlight_sysfs_if(
394 const struct dmi_system_id *d)
396 if (disable_backlight_sysfs_if == -1)
397 disable_backlight_sysfs_if = 1;
401 static struct dmi_system_id video_dmi_table[] = {
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"),
447 * Some machines have a broken acpi-video interface for brightness
448 * control, but still need an acpi_video_device_lcd_set_level() call
449 * on resume to turn the backlight power on. We Enable backlight
450 * control on these systems, but do not register a backlight sysfs
451 * as brightness control does not work.
454 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
455 .callback = video_disable_backlight_sysfs_if,
456 .ident = "Toshiba Portege R830",
458 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
465 static unsigned long long
466 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
467 unsigned long long bqc_value)
469 unsigned long long level;
471 if (device->brightness->flags._BQC_use_index) {
473 * _BQC returns an index that doesn't account for
474 * the first 2 items with special meaning, so we need
475 * to compensate for that by offsetting ourselves
477 if (device->brightness->flags._BCL_reversed)
478 bqc_value = device->brightness->count - 3 - bqc_value;
480 level = device->brightness->levels[bqc_value + 2];
485 level += bqc_offset_aml_bug_workaround;
491 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
492 unsigned long long *level, bool raw)
494 acpi_status status = AE_OK;
497 if (device->cap._BQC || device->cap._BCQ) {
498 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
500 status = acpi_evaluate_integer(device->dev->handle, buf,
502 if (ACPI_SUCCESS(status)) {
505 * Caller has indicated he wants the raw
506 * value returned by _BQC, so don't furtherly
507 * mess with the value.
512 *level = acpi_video_bqc_value_to_level(device, *level);
514 for (i = 2; i < device->brightness->count; i++)
515 if (device->brightness->levels[i] == *level) {
516 device->brightness->curr = *level;
520 * BQC returned an invalid level.
523 ACPI_WARNING((AE_INFO,
524 "%s returned an invalid level",
526 device->cap._BQC = device->cap._BCQ = 0;
530 * should we return an error or ignore this failure?
531 * dev->brightness->curr is a cached value which stores
532 * the correct current backlight level in most cases.
533 * ACPI video backlight still works w/ buggy _BQC.
534 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
536 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
537 device->cap._BQC = device->cap._BCQ = 0;
541 *level = device->brightness->curr;
546 acpi_video_device_EDID(struct acpi_video_device *device,
547 union acpi_object **edid, ssize_t length)
550 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
551 union acpi_object *obj;
552 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
553 struct acpi_object_list args = { 1, &arg0 };
561 arg0.integer.value = 1;
562 else if (length == 256)
563 arg0.integer.value = 2;
567 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
568 if (ACPI_FAILURE(status))
571 obj = buffer.pointer;
573 if (obj && obj->type == ACPI_TYPE_BUFFER)
576 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
588 * video : video bus device pointer
590 * 0. The system BIOS should NOT automatically switch(toggle)
591 * the active display output.
592 * 1. The system BIOS should automatically switch (toggle) the
593 * active display output. No switch event.
594 * 2. The _DGS value should be locked.
595 * 3. The system BIOS should not automatically switch (toggle) the
596 * active display output, but instead generate the display switch
599 * 0. The system BIOS should automatically control the brightness level
600 * of the LCD when the power changes from AC to DC
601 * 1. The system BIOS should NOT automatically control the brightness
602 * level of the LCD when the power changes from AC to DC.
608 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
612 if (!video->cap._DOS)
615 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
617 video->dos_setting = (lcd_flag << 2) | bios_flag;
618 status = acpi_execute_simple_method(video->device->handle, "_DOS",
619 (lcd_flag << 2) | bios_flag);
620 if (ACPI_FAILURE(status))
627 * Simple comparison function used to sort backlight levels.
631 acpi_video_cmp_level(const void *a, const void *b)
633 return *(int *)a - *(int *)b;
637 * Decides if _BQC/_BCQ for this system is usable
639 * We do this by changing the level first and then read out the current
640 * brightness level, if the value does not match, find out if it is using
641 * index. If not, clear the _BQC/_BCQ capability.
643 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
644 int max_level, int current_level)
646 struct acpi_video_device_brightness *br = device->brightness;
648 unsigned long long level;
651 /* don't mess with existing known broken systems */
652 if (bqc_offset_aml_bug_workaround)
656 * Some systems always report current brightness level as maximum
657 * through _BQC, we need to test another value for them.
659 test_level = current_level == max_level ? br->levels[3] : max_level;
661 result = acpi_video_device_lcd_set_level(device, test_level);
665 result = acpi_video_device_lcd_get_level_current(device, &level, true);
669 if (level != test_level) {
670 /* buggy _BQC found, need to find out if it uses index */
671 if (level < br->count) {
672 if (br->flags._BCL_reversed)
673 level = br->count - 3 - level;
674 if (br->levels[level + 2] == test_level)
675 br->flags._BQC_use_index = 1;
678 if (!br->flags._BQC_use_index)
679 device->cap._BQC = device->cap._BCQ = 0;
688 * device : video output device (LCD, CRT, ..)
691 * Maximum brightness level
693 * Allocate and initialize device->brightness.
697 acpi_video_init_brightness(struct acpi_video_device *device)
699 union acpi_object *obj = NULL;
700 int i, max_level = 0, count = 0, level_ac_battery = 0;
701 unsigned long long level, level_old;
702 union acpi_object *o;
703 struct acpi_video_device_brightness *br = NULL;
704 int result = -EINVAL;
707 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
708 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
709 "LCD brightness level\n"));
713 if (obj->package.count < 2)
716 br = kzalloc(sizeof(*br), GFP_KERNEL);
718 printk(KERN_ERR "can't allocate memory\n");
723 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
730 for (i = 0; i < obj->package.count; i++) {
731 o = (union acpi_object *)&obj->package.elements[i];
732 if (o->type != ACPI_TYPE_INTEGER) {
733 printk(KERN_ERR PREFIX "Invalid data\n");
736 value = (u32) o->integer.value;
737 /* Skip duplicate entries */
738 if (count > 2 && br->levels[count - 1] == value)
741 br->levels[count] = value;
743 if (br->levels[count] > max_level)
744 max_level = br->levels[count];
749 * some buggy BIOS don't export the levels
750 * when machine is on AC/Battery in _BCL package.
751 * In this case, the first two elements in _BCL packages
752 * are also supported brightness levels that OS should take care of.
754 for (i = 2; i < count; i++) {
755 if (br->levels[i] == br->levels[0])
757 if (br->levels[i] == br->levels[1])
761 if (level_ac_battery < 2) {
762 level_ac_battery = 2 - level_ac_battery;
763 br->flags._BCL_no_ac_battery_levels = 1;
764 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
765 br->levels[i] = br->levels[i - level_ac_battery];
766 count += level_ac_battery;
767 } else if (level_ac_battery > 2)
768 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
770 /* Check if the _BCL package is in a reversed order */
771 if (max_level == br->levels[2]) {
772 br->flags._BCL_reversed = 1;
773 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
774 acpi_video_cmp_level, NULL);
775 } else if (max_level != br->levels[count - 1])
777 "Found unordered _BCL package"));
780 device->brightness = br;
782 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
783 br->curr = level = max_level;
785 if (!device->cap._BQC)
788 result = acpi_video_device_lcd_get_level_current(device,
791 goto out_free_levels;
793 result = acpi_video_bqc_quirk(device, max_level, level_old);
795 goto out_free_levels;
797 * cap._BQC may get cleared due to _BQC is found to be broken
798 * in acpi_video_bqc_quirk, so check again here.
800 if (!device->cap._BQC)
803 level = acpi_video_bqc_value_to_level(device, level_old);
805 * On some buggy laptops, _BQC returns an uninitialized
806 * value when invoked for the first time, i.e.
807 * level_old is invalid (no matter whether it's a level
808 * or an index). Set the backlight to max_level in this case.
810 for (i = 2; i < br->count; i++)
811 if (level == br->levels[i])
813 if (i == br->count || !level)
817 result = acpi_video_device_lcd_set_level(device, level);
819 goto out_free_levels;
821 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
822 "found %d brightness levels\n", count - 2));
831 device->brightness = NULL;
838 * device : video output device (LCD, CRT, ..)
843 * Find out all required AML methods defined under the output
847 static void acpi_video_device_find_cap(struct acpi_video_device *device)
849 if (acpi_has_method(device->dev->handle, "_ADR"))
850 device->cap._ADR = 1;
851 if (acpi_has_method(device->dev->handle, "_BCL"))
852 device->cap._BCL = 1;
853 if (acpi_has_method(device->dev->handle, "_BCM"))
854 device->cap._BCM = 1;
855 if (acpi_has_method(device->dev->handle, "_BQC")) {
856 device->cap._BQC = 1;
857 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
858 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
859 device->cap._BCQ = 1;
862 if (acpi_has_method(device->dev->handle, "_DDC"))
863 device->cap._DDC = 1;
868 * device : video output device (VGA)
873 * Find out all required AML methods defined under the video bus device.
876 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
878 if (acpi_has_method(video->device->handle, "_DOS"))
880 if (acpi_has_method(video->device->handle, "_DOD"))
882 if (acpi_has_method(video->device->handle, "_ROM"))
884 if (acpi_has_method(video->device->handle, "_GPD"))
886 if (acpi_has_method(video->device->handle, "_SPD"))
888 if (acpi_has_method(video->device->handle, "_VPO"))
893 * Check whether the video bus device has required AML method to
894 * support the desired features
897 static int acpi_video_bus_check(struct acpi_video_bus *video)
899 acpi_status status = -ENOENT;
905 dev = acpi_get_pci_dev(video->device->handle);
911 * Since there is no HID, CID and so on for VGA driver, we have
912 * to check well known required nodes.
915 /* Does this device support video switching? */
916 if (video->cap._DOS || video->cap._DOD) {
917 if (!video->cap._DOS) {
918 printk(KERN_WARNING FW_BUG
919 "ACPI(%s) defines _DOD but not _DOS\n",
920 acpi_device_bid(video->device));
922 video->flags.multihead = 1;
926 /* Does this device support retrieving a video ROM? */
927 if (video->cap._ROM) {
928 video->flags.rom = 1;
932 /* Does this device support configuring which video device to POST? */
933 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
934 video->flags.post = 1;
942 * --------------------------------------------------------------------------
944 * --------------------------------------------------------------------------
947 /* device interface */
948 static struct acpi_video_device_attrib *
949 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
951 struct acpi_video_enumerated_device *ids;
954 for (i = 0; i < video->attached_count; i++) {
955 ids = &video->attached_array[i];
956 if ((ids->value.int_val & 0xffff) == device_id)
957 return &ids->value.attrib;
964 acpi_video_get_device_type(struct acpi_video_bus *video,
965 unsigned long device_id)
967 struct acpi_video_enumerated_device *ids;
970 for (i = 0; i < video->attached_count; i++) {
971 ids = &video->attached_array[i];
972 if ((ids->value.int_val & 0xffff) == device_id)
973 return ids->value.int_val;
980 acpi_video_bus_get_one_device(struct acpi_device *device,
981 struct acpi_video_bus *video)
983 unsigned long long device_id;
984 int status, device_type;
985 struct acpi_video_device *data;
986 struct acpi_video_device_attrib *attribute;
989 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
990 /* Some device omits _ADR, we skip them instead of fail */
991 if (ACPI_FAILURE(status))
994 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
998 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
999 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1000 device->driver_data = data;
1002 data->device_id = device_id;
1003 data->video = video;
1005 INIT_DELAYED_WORK(&data->switch_brightness_work,
1006 acpi_video_switch_brightness);
1008 attribute = acpi_video_get_device_attr(video, device_id);
1010 if (attribute && attribute->device_id_scheme) {
1011 switch (attribute->display_type) {
1012 case ACPI_VIDEO_DISPLAY_CRT:
1013 data->flags.crt = 1;
1015 case ACPI_VIDEO_DISPLAY_TV:
1016 data->flags.tvout = 1;
1018 case ACPI_VIDEO_DISPLAY_DVI:
1019 data->flags.dvi = 1;
1021 case ACPI_VIDEO_DISPLAY_LCD:
1022 data->flags.lcd = 1;
1025 data->flags.unknown = 1;
1028 if (attribute->bios_can_detect)
1029 data->flags.bios = 1;
1031 /* Check for legacy IDs */
1032 device_type = acpi_video_get_device_type(video, device_id);
1033 /* Ignore bits 16 and 18-20 */
1034 switch (device_type & 0xffe2ffff) {
1035 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1036 data->flags.crt = 1;
1038 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1039 data->flags.lcd = 1;
1041 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1042 data->flags.tvout = 1;
1045 data->flags.unknown = 1;
1049 acpi_video_device_bind(video, data);
1050 acpi_video_device_find_cap(data);
1052 mutex_lock(&video->device_list_lock);
1053 list_add_tail(&data->entry, &video->video_device_list);
1054 mutex_unlock(&video->device_list_lock);
1061 * video : video bus device
1066 * Enumerate the video device list of the video bus,
1067 * bind the ids with the corresponding video devices
1068 * under the video bus.
1071 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1073 struct acpi_video_device *dev;
1075 mutex_lock(&video->device_list_lock);
1077 list_for_each_entry(dev, &video->video_device_list, entry)
1078 acpi_video_device_bind(video, dev);
1080 mutex_unlock(&video->device_list_lock);
1085 * video : video bus device
1086 * device : video output device under the video
1092 * Bind the ids with the corresponding video devices
1093 * under the video bus.
1097 acpi_video_device_bind(struct acpi_video_bus *video,
1098 struct acpi_video_device *device)
1100 struct acpi_video_enumerated_device *ids;
1103 for (i = 0; i < video->attached_count; i++) {
1104 ids = &video->attached_array[i];
1105 if (device->device_id == (ids->value.int_val & 0xffff)) {
1106 ids->bind_info = device;
1107 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1112 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1114 struct acpi_video_bus *video = device->video;
1118 * If we have a broken _DOD or we have more than 8 output devices
1119 * under the graphics controller node that we can't proper deal with
1120 * in the operation region code currently, no need to test.
1122 if (!video->attached_count || video->child_count > 8)
1125 for (i = 0; i < video->attached_count; i++) {
1126 if ((video->attached_array[i].value.int_val & 0xfff) ==
1127 (device->device_id & 0xfff))
1136 * video : video bus device
1141 * Call _DOD to enumerate all devices attached to display adapter
1145 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1150 struct acpi_video_enumerated_device *active_list;
1151 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1152 union acpi_object *dod = NULL;
1153 union acpi_object *obj;
1155 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1156 if (!ACPI_SUCCESS(status)) {
1157 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1161 dod = buffer.pointer;
1162 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1163 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1169 dod->package.count));
1171 active_list = kcalloc(1 + dod->package.count,
1172 sizeof(struct acpi_video_enumerated_device),
1180 for (i = 0; i < dod->package.count; i++) {
1181 obj = &dod->package.elements[i];
1183 if (obj->type != ACPI_TYPE_INTEGER) {
1184 printk(KERN_ERR PREFIX
1185 "Invalid _DOD data in element %d\n", i);
1189 active_list[count].value.int_val = obj->integer.value;
1190 active_list[count].bind_info = NULL;
1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1192 (int)obj->integer.value));
1196 kfree(video->attached_array);
1198 video->attached_array = active_list;
1199 video->attached_count = count;
1202 kfree(buffer.pointer);
1207 acpi_video_get_next_level(struct acpi_video_device *device,
1208 u32 level_current, u32 event)
1210 int min, max, min_above, max_below, i, l, delta = 255;
1211 max = max_below = 0;
1212 min = min_above = 255;
1213 /* Find closest level to level_current */
1214 for (i = 2; i < device->brightness->count; i++) {
1215 l = device->brightness->levels[i];
1216 if (abs(l - level_current) < abs(delta)) {
1217 delta = l - level_current;
1222 /* Ajust level_current to closest available level */
1223 level_current += delta;
1224 for (i = 2; i < device->brightness->count; i++) {
1225 l = device->brightness->levels[i];
1230 if (l < min_above && l > level_current)
1232 if (l > max_below && l < level_current)
1237 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1238 return (level_current < max) ? min_above : min;
1239 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1240 return (level_current < max) ? min_above : max;
1241 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1242 return (level_current > min) ? max_below : min;
1243 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1244 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1247 return level_current;
1252 acpi_video_switch_brightness(struct work_struct *work)
1254 struct acpi_video_device *device = container_of(to_delayed_work(work),
1255 struct acpi_video_device, switch_brightness_work);
1256 unsigned long long level_current, level_next;
1257 int event = device->switch_brightness_event;
1258 int result = -EINVAL;
1260 /* no warning message if acpi_backlight=vendor or a quirk is used */
1261 if (!device->backlight)
1264 if (!device->brightness)
1267 result = acpi_video_device_lcd_get_level_current(device,
1273 level_next = acpi_video_get_next_level(device, level_current, event);
1275 result = acpi_video_device_lcd_set_level(device, level_next);
1278 backlight_force_update(device->backlight,
1279 BACKLIGHT_UPDATE_HOTKEY);
1283 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1286 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1289 struct acpi_video_bus *video;
1290 struct acpi_video_device *video_device;
1291 union acpi_object *buffer = NULL;
1295 if (!device || !acpi_driver_data(device))
1298 video = acpi_driver_data(device);
1300 for (i = 0; i < video->attached_count; i++) {
1301 video_device = video->attached_array[i].bind_info;
1307 if (!video_device->cap._DDC)
1312 case ACPI_VIDEO_DISPLAY_CRT:
1313 if (!video_device->flags.crt)
1316 case ACPI_VIDEO_DISPLAY_TV:
1317 if (!video_device->flags.tvout)
1320 case ACPI_VIDEO_DISPLAY_DVI:
1321 if (!video_device->flags.dvi)
1324 case ACPI_VIDEO_DISPLAY_LCD:
1325 if (!video_device->flags.lcd)
1329 } else if (video_device->device_id != device_id) {
1333 status = acpi_video_device_EDID(video_device, &buffer, length);
1335 if (ACPI_FAILURE(status) || !buffer ||
1336 buffer->type != ACPI_TYPE_BUFFER) {
1338 status = acpi_video_device_EDID(video_device, &buffer,
1340 if (ACPI_FAILURE(status) || !buffer ||
1341 buffer->type != ACPI_TYPE_BUFFER) {
1346 *edid = buffer->buffer.pointer;
1352 EXPORT_SYMBOL(acpi_video_get_edid);
1355 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1356 struct acpi_device *device)
1359 struct acpi_device *dev;
1362 * There are systems where video module known to work fine regardless
1363 * of broken _DOD and ignoring returned value here doesn't cause
1366 acpi_video_device_enumerate(video);
1368 list_for_each_entry(dev, &device->children, node) {
1370 status = acpi_video_bus_get_one_device(dev, video);
1372 dev_err(&dev->dev, "Can't attach device\n");
1375 video->child_count++;
1380 /* acpi_video interface */
1383 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1384 * preform any automatic brightness change on receiving a notification.
1386 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1388 return acpi_video_bus_DOS(video, 0,
1389 acpi_osi_is_win8() ? 1 : 0);
1392 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1394 return acpi_video_bus_DOS(video, 0,
1395 acpi_osi_is_win8() ? 0 : 1);
1398 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1400 struct acpi_video_bus *video = acpi_driver_data(device);
1401 struct input_dev *input;
1404 if (!video || !video->input)
1407 input = video->input;
1410 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1411 * most likely via hotkey. */
1412 keycode = KEY_SWITCHVIDEOMODE;
1415 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1417 acpi_video_device_enumerate(video);
1418 acpi_video_device_rebind(video);
1419 keycode = KEY_SWITCHVIDEOMODE;
1422 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1423 keycode = KEY_SWITCHVIDEOMODE;
1425 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1426 keycode = KEY_VIDEO_NEXT;
1428 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1429 keycode = KEY_VIDEO_PREV;
1433 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1434 "Unsupported event [0x%x]\n", event));
1438 if (acpi_notifier_call_chain(device, event, 0))
1439 /* Something vetoed the keypress. */
1443 input_report_key(input, keycode, 1);
1445 input_report_key(input, keycode, 0);
1452 static void brightness_switch_event(struct acpi_video_device *video_device,
1455 if (!brightness_switch_enabled)
1458 video_device->switch_brightness_event = event;
1459 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1462 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1464 struct acpi_video_device *video_device = data;
1465 struct acpi_device *device = NULL;
1466 struct acpi_video_bus *bus;
1467 struct input_dev *input;
1473 device = video_device->dev;
1474 bus = video_device->video;
1478 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1479 brightness_switch_event(video_device, event);
1480 keycode = KEY_BRIGHTNESS_CYCLE;
1482 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1483 brightness_switch_event(video_device, event);
1484 keycode = KEY_BRIGHTNESSUP;
1486 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1487 brightness_switch_event(video_device, event);
1488 keycode = KEY_BRIGHTNESSDOWN;
1490 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1491 brightness_switch_event(video_device, event);
1492 keycode = KEY_BRIGHTNESS_ZERO;
1494 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1495 brightness_switch_event(video_device, event);
1496 keycode = KEY_DISPLAY_OFF;
1499 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1500 "Unsupported event [0x%x]\n", event));
1504 acpi_notifier_call_chain(device, event, 0);
1507 input_report_key(input, keycode, 1);
1509 input_report_key(input, keycode, 0);
1516 static int acpi_video_resume(struct notifier_block *nb,
1517 unsigned long val, void *ign)
1519 struct acpi_video_bus *video;
1520 struct acpi_video_device *video_device;
1524 case PM_HIBERNATION_PREPARE:
1525 case PM_SUSPEND_PREPARE:
1526 case PM_RESTORE_PREPARE:
1530 video = container_of(nb, struct acpi_video_bus, pm_nb);
1532 dev_info(&video->device->dev, "Restoring backlight state\n");
1534 for (i = 0; i < video->attached_count; i++) {
1535 video_device = video->attached_array[i].bind_info;
1536 if (video_device && video_device->brightness)
1537 acpi_video_device_lcd_set_level(video_device,
1538 video_device->brightness->curr);
1545 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1546 void **return_value)
1548 struct acpi_device *device = context;
1549 struct acpi_device *sibling;
1552 if (handle == device->handle)
1553 return AE_CTRL_TERMINATE;
1555 result = acpi_bus_get_device(handle, &sibling);
1559 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1560 return AE_ALREADY_EXISTS;
1565 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1567 struct backlight_properties props;
1568 struct pci_dev *pdev;
1569 acpi_handle acpi_parent;
1570 struct device *parent = NULL;
1576 * Do not create backlight device for video output
1577 * device that is not in the enumerated list.
1579 if (!acpi_video_device_in_dod(device)) {
1580 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1584 result = acpi_video_init_brightness(device);
1588 if (disable_backlight_sysfs_if > 0)
1591 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1596 acpi_get_parent(device->dev->handle, &acpi_parent);
1598 pdev = acpi_get_pci_dev(acpi_parent);
1600 parent = &pdev->dev;
1604 memset(&props, 0, sizeof(struct backlight_properties));
1605 props.type = BACKLIGHT_FIRMWARE;
1606 props.max_brightness = device->brightness->count - 3;
1607 device->backlight = backlight_device_register(name,
1610 &acpi_backlight_ops,
1613 if (IS_ERR(device->backlight)) {
1614 device->backlight = NULL;
1619 * Save current brightness level in case we have to restore it
1620 * before acpi_video_device_lcd_set_level() is called next time.
1622 device->backlight->props.brightness =
1623 acpi_video_get_brightness(device->backlight);
1625 device->cooling_dev = thermal_cooling_device_register("LCD",
1626 device->dev, &video_cooling_ops);
1627 if (IS_ERR(device->cooling_dev)) {
1629 * Set cooling_dev to NULL so we don't crash trying to free it.
1630 * Also, why the hell we are returning early and not attempt to
1631 * register video output if cooling device registration failed?
1634 device->cooling_dev = NULL;
1638 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1639 device->cooling_dev->id);
1640 result = sysfs_create_link(&device->dev->dev.kobj,
1641 &device->cooling_dev->device.kobj,
1644 printk(KERN_ERR PREFIX "Create sysfs link\n");
1645 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1646 &device->dev->dev.kobj, "device");
1648 printk(KERN_ERR PREFIX "Create sysfs link\n");
1651 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1653 struct acpi_video_device *dev;
1654 union acpi_object *levels;
1656 mutex_lock(&video->device_list_lock);
1657 list_for_each_entry(dev, &video->video_device_list, entry) {
1658 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1661 mutex_unlock(&video->device_list_lock);
1664 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1666 struct acpi_video_device *dev;
1668 if (video->backlight_registered)
1671 acpi_video_run_bcl_for_osi(video);
1673 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1676 mutex_lock(&video->device_list_lock);
1677 list_for_each_entry(dev, &video->video_device_list, entry)
1678 acpi_video_dev_register_backlight(dev);
1679 mutex_unlock(&video->device_list_lock);
1681 video->backlight_registered = true;
1683 video->pm_nb.notifier_call = acpi_video_resume;
1684 video->pm_nb.priority = 0;
1685 return register_pm_notifier(&video->pm_nb);
1688 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1690 if (device->backlight) {
1691 backlight_device_unregister(device->backlight);
1692 device->backlight = NULL;
1694 if (device->brightness) {
1695 kfree(device->brightness->levels);
1696 kfree(device->brightness);
1697 device->brightness = NULL;
1699 if (device->cooling_dev) {
1700 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1701 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1702 thermal_cooling_device_unregister(device->cooling_dev);
1703 device->cooling_dev = NULL;
1707 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1709 struct acpi_video_device *dev;
1712 if (!video->backlight_registered)
1715 error = unregister_pm_notifier(&video->pm_nb);
1717 mutex_lock(&video->device_list_lock);
1718 list_for_each_entry(dev, &video->video_device_list, entry)
1719 acpi_video_dev_unregister_backlight(dev);
1720 mutex_unlock(&video->device_list_lock);
1722 video->backlight_registered = false;
1727 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1730 struct acpi_device *adev = device->dev;
1732 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1733 acpi_video_device_notify, device);
1734 if (ACPI_FAILURE(status))
1735 dev_err(&adev->dev, "Error installing notify handler\n");
1737 device->flags.notify = 1;
1740 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1742 struct input_dev *input;
1743 struct acpi_video_device *dev;
1746 video->input = input = input_allocate_device();
1752 error = acpi_video_bus_start_devices(video);
1754 goto err_free_input;
1756 snprintf(video->phys, sizeof(video->phys),
1757 "%s/video/input0", acpi_device_hid(video->device));
1759 input->name = acpi_device_name(video->device);
1760 input->phys = video->phys;
1761 input->id.bustype = BUS_HOST;
1762 input->id.product = 0x06;
1763 input->dev.parent = &video->device->dev;
1764 input->evbit[0] = BIT(EV_KEY);
1765 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1766 set_bit(KEY_VIDEO_NEXT, input->keybit);
1767 set_bit(KEY_VIDEO_PREV, input->keybit);
1768 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1769 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1770 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1771 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1772 set_bit(KEY_DISPLAY_OFF, input->keybit);
1774 error = input_register_device(input);
1778 mutex_lock(&video->device_list_lock);
1779 list_for_each_entry(dev, &video->video_device_list, entry)
1780 acpi_video_dev_add_notify_handler(dev);
1781 mutex_unlock(&video->device_list_lock);
1786 acpi_video_bus_stop_devices(video);
1788 input_free_device(input);
1789 video->input = NULL;
1794 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1796 if (dev->flags.notify) {
1797 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1798 acpi_video_device_notify);
1799 dev->flags.notify = 0;
1803 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1805 struct acpi_video_device *dev;
1807 mutex_lock(&video->device_list_lock);
1808 list_for_each_entry(dev, &video->video_device_list, entry)
1809 acpi_video_dev_remove_notify_handler(dev);
1810 mutex_unlock(&video->device_list_lock);
1812 acpi_video_bus_stop_devices(video);
1813 input_unregister_device(video->input);
1814 video->input = NULL;
1817 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1819 struct acpi_video_device *dev, *next;
1821 mutex_lock(&video->device_list_lock);
1822 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1823 list_del(&dev->entry);
1826 mutex_unlock(&video->device_list_lock);
1831 static int instance;
1833 static int acpi_video_bus_add(struct acpi_device *device)
1835 struct acpi_video_bus *video;
1839 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1840 device->parent->handle, 1,
1841 acpi_video_bus_match, NULL,
1843 if (status == AE_ALREADY_EXISTS) {
1844 printk(KERN_WARNING FW_BUG
1845 "Duplicate ACPI video bus devices for the"
1846 " same VGA controller, please try module "
1847 "parameter \"video.allow_duplicates=1\""
1848 "if the current driver doesn't work.\n");
1849 if (!allow_duplicates)
1853 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1857 /* a hack to fix the duplicate name "VID" problem on T61 */
1858 if (!strcmp(device->pnp.bus_id, "VID")) {
1860 device->pnp.bus_id[3] = '0' + instance;
1863 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1864 if (!strcmp(device->pnp.bus_id, "VGA")) {
1866 device->pnp.bus_id[3] = '0' + instance;
1870 video->device = device;
1871 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1872 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1873 device->driver_data = video;
1875 acpi_video_bus_find_cap(video);
1876 error = acpi_video_bus_check(video);
1878 goto err_free_video;
1880 mutex_init(&video->device_list_lock);
1881 INIT_LIST_HEAD(&video->video_device_list);
1883 error = acpi_video_bus_get_devices(video, device);
1887 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1888 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1889 video->flags.multihead ? "yes" : "no",
1890 video->flags.rom ? "yes" : "no",
1891 video->flags.post ? "yes" : "no");
1892 mutex_lock(&video_list_lock);
1893 list_add_tail(&video->entry, &video_bus_head);
1894 mutex_unlock(&video_list_lock);
1896 acpi_video_bus_register_backlight(video);
1897 acpi_video_bus_add_notify_handler(video);
1902 acpi_video_bus_put_devices(video);
1903 kfree(video->attached_array);
1906 device->driver_data = NULL;
1911 static int acpi_video_bus_remove(struct acpi_device *device)
1913 struct acpi_video_bus *video = NULL;
1916 if (!device || !acpi_driver_data(device))
1919 video = acpi_driver_data(device);
1921 acpi_video_bus_remove_notify_handler(video);
1922 acpi_video_bus_unregister_backlight(video);
1923 acpi_video_bus_put_devices(video);
1925 mutex_lock(&video_list_lock);
1926 list_del(&video->entry);
1927 mutex_unlock(&video_list_lock);
1929 kfree(video->attached_array);
1935 static int __init is_i740(struct pci_dev *dev)
1937 if (dev->device == 0x00D1)
1939 if (dev->device == 0x7000)
1944 static int __init intel_opregion_present(void)
1947 struct pci_dev *dev = NULL;
1950 for_each_pci_dev(dev) {
1951 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1953 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1955 /* We don't want to poke around undefined i740 registers */
1958 pci_read_config_dword(dev, 0xfc, &address);
1966 int acpi_video_register(void)
1970 mutex_lock(®ister_count_mutex);
1971 if (register_count) {
1973 * if the function of acpi_video_register is already called,
1974 * don't register the acpi_vide_bus again and return no error.
1979 mutex_init(&video_list_lock);
1980 INIT_LIST_HEAD(&video_bus_head);
1982 dmi_check_system(video_dmi_table);
1984 ret = acpi_bus_register_driver(&acpi_video_bus);
1989 * When the acpi_video_bus is loaded successfully, increase
1990 * the counter reference.
1995 mutex_unlock(®ister_count_mutex);
1998 EXPORT_SYMBOL(acpi_video_register);
2000 void acpi_video_unregister(void)
2002 mutex_lock(®ister_count_mutex);
2003 if (register_count) {
2004 acpi_bus_unregister_driver(&acpi_video_bus);
2007 mutex_unlock(®ister_count_mutex);
2009 EXPORT_SYMBOL(acpi_video_unregister);
2011 void acpi_video_unregister_backlight(void)
2013 struct acpi_video_bus *video;
2015 mutex_lock(®ister_count_mutex);
2016 if (register_count) {
2017 mutex_lock(&video_list_lock);
2018 list_for_each_entry(video, &video_bus_head, entry)
2019 acpi_video_bus_unregister_backlight(video);
2020 mutex_unlock(&video_list_lock);
2022 mutex_unlock(®ister_count_mutex);
2026 * This is kind of nasty. Hardware using Intel chipsets may require
2027 * the video opregion code to be run first in order to initialise
2028 * state before any ACPI video calls are made. To handle this we defer
2029 * registration of the video class until the opregion code has run.
2032 static int __init acpi_video_init(void)
2035 * Let the module load even if ACPI is disabled (e.g. due to
2036 * a broken BIOS) so that i915.ko can still be loaded on such
2037 * old systems without an AcpiOpRegion.
2039 * acpi_video_register() will report -ENODEV later as well due
2040 * to acpi_disabled when i915.ko tries to register itself afterwards.
2045 if (intel_opregion_present())
2048 return acpi_video_register();
2051 static void __exit acpi_video_exit(void)
2053 acpi_video_detect_exit();
2054 acpi_video_unregister();
2059 module_init(acpi_video_init);
2060 module_exit(acpi_video_exit);