2 * video.c - ACPI Video Driver
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = true;
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
96 static const struct acpi_device_id video_device_ids[] = {
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
102 static struct acpi_driver acpi_video_bus = {
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
143 struct acpi_video_enumerated_device {
146 struct acpi_video_device_attrib attrib;
148 struct acpi_video_device *bind_info;
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 bool backlight_registered;
154 bool backlight_notifier_registered;
156 struct acpi_video_enumerated_device *attached_array;
159 struct acpi_video_bus_cap cap;
160 struct acpi_video_bus_flags flags;
161 struct list_head video_device_list;
162 struct mutex device_list_lock; /* protects video_device_list */
163 struct list_head entry;
164 struct input_dev *input;
165 char phys[32]; /* for input device */
166 struct notifier_block pm_nb;
167 struct notifier_block backlight_nb;
170 struct acpi_video_device_flags {
181 struct acpi_video_device_cap {
182 u8 _ADR:1; /* Return the unique ID */
183 u8 _BCL:1; /* Query list of brightness control levels supported */
184 u8 _BCM:1; /* Set the brightness level */
185 u8 _BQC:1; /* Get current brightness level */
186 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
187 u8 _DDC:1; /* Return the EDID for this device */
190 struct acpi_video_brightness_flags {
191 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
192 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
193 u8 _BQC_use_index:1; /* _BQC returns an index value */
196 struct acpi_video_device_brightness {
200 struct acpi_video_brightness_flags flags;
203 struct acpi_video_device {
204 unsigned long device_id;
205 struct acpi_video_device_flags flags;
206 struct acpi_video_device_cap cap;
207 struct list_head entry;
208 struct delayed_work switch_brightness_work;
209 int switch_brightness_event;
210 struct acpi_video_bus *video;
211 struct acpi_device *dev;
212 struct acpi_video_device_brightness *brightness;
213 struct backlight_device *backlight;
214 struct thermal_cooling_device *cooling_dev;
217 static const char device_decode[][30] = {
218 "motherboard VGA device",
224 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
225 static void acpi_video_device_rebind(struct acpi_video_bus *video);
226 static void acpi_video_device_bind(struct acpi_video_bus *video,
227 struct acpi_video_device *device);
228 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
229 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
231 static int acpi_video_device_lcd_get_level_current(
232 struct acpi_video_device *device,
233 unsigned long long *level, bool raw);
234 static int acpi_video_get_next_level(struct acpi_video_device *device,
235 u32 level_current, u32 event);
236 static void acpi_video_switch_brightness(struct work_struct *work);
238 static bool acpi_video_use_native_backlight(void)
240 if (use_native_backlight_param != -1)
241 return use_native_backlight_param;
243 return use_native_backlight_dmi;
246 bool acpi_video_verify_backlight_support(void)
248 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
249 backlight_device_registered(BACKLIGHT_RAW))
251 return acpi_video_backlight_support();
253 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
255 /* backlight device sysfs support */
256 static int acpi_video_get_brightness(struct backlight_device *bd)
258 unsigned long long cur_level;
260 struct acpi_video_device *vd = bl_get_data(bd);
262 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
264 for (i = 2; i < vd->brightness->count; i++) {
265 if (vd->brightness->levels[i] == cur_level)
267 * The first two entries are special - see page 575
268 * of the ACPI spec 3.0
275 static int acpi_video_set_brightness(struct backlight_device *bd)
277 int request_level = bd->props.brightness + 2;
278 struct acpi_video_device *vd = bl_get_data(bd);
280 cancel_delayed_work(&vd->switch_brightness_work);
281 return acpi_video_device_lcd_set_level(vd,
282 vd->brightness->levels[request_level]);
285 static const struct backlight_ops acpi_backlight_ops = {
286 .get_brightness = acpi_video_get_brightness,
287 .update_status = acpi_video_set_brightness,
290 /* thermal cooling device callbacks */
291 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
294 struct acpi_device *device = cooling_dev->devdata;
295 struct acpi_video_device *video = acpi_driver_data(device);
297 *state = video->brightness->count - 3;
301 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
304 struct acpi_device *device = cooling_dev->devdata;
305 struct acpi_video_device *video = acpi_driver_data(device);
306 unsigned long long level;
309 if (acpi_video_device_lcd_get_level_current(video, &level, false))
311 for (offset = 2; offset < video->brightness->count; offset++)
312 if (level == video->brightness->levels[offset]) {
313 *state = video->brightness->count - offset - 1;
321 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
323 struct acpi_device *device = cooling_dev->devdata;
324 struct acpi_video_device *video = acpi_driver_data(device);
327 if (state >= video->brightness->count - 2)
330 state = video->brightness->count - state;
331 level = video->brightness->levels[state - 1];
332 return acpi_video_device_lcd_set_level(video, level);
335 static const struct thermal_cooling_device_ops video_cooling_ops = {
336 .get_max_state = video_get_max_state,
337 .get_cur_state = video_get_cur_state,
338 .set_cur_state = video_set_cur_state,
342 * --------------------------------------------------------------------------
344 * --------------------------------------------------------------------------
348 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
349 union acpi_object **levels)
352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
353 union acpi_object *obj;
358 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
359 if (!ACPI_SUCCESS(status))
361 obj = (union acpi_object *)buffer.pointer;
362 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
363 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
373 kfree(buffer.pointer);
379 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
384 status = acpi_execute_simple_method(device->dev->handle,
386 if (ACPI_FAILURE(status)) {
387 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
391 device->brightness->curr = level;
392 for (state = 2; state < device->brightness->count; state++)
393 if (level == device->brightness->levels[state]) {
394 if (device->backlight)
395 device->backlight->props.brightness = state - 2;
399 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
404 * For some buggy _BQC methods, we need to add a constant value to
405 * the _BQC return value to get the actual current brightness level
408 static int bqc_offset_aml_bug_workaround;
409 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
411 bqc_offset_aml_bug_workaround = 9;
415 static int __init video_disable_native_backlight(const struct dmi_system_id *d)
417 use_native_backlight_dmi = false;
421 static struct dmi_system_id video_dmi_table[] __initdata = {
423 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
426 .callback = video_set_bqc_offset,
427 .ident = "Acer Aspire 5720",
429 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
430 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5710Z",
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
442 .callback = video_set_bqc_offset,
443 .ident = "eMachines E510",
445 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
450 .callback = video_set_bqc_offset,
451 .ident = "Acer Aspire 5315",
453 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 7720",
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
467 * These models have a working acpi_video backlight control, and using
468 * native backlight causes a regression where backlight does not work
469 * when userspace is not handling brightness key events. Disable
470 * native_backlight on these to fix this:
471 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
474 .callback = video_disable_native_backlight,
475 .ident = "ThinkPad T420",
477 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
478 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
482 .callback = video_disable_native_backlight,
483 .ident = "ThinkPad T520",
485 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
486 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
490 .callback = video_disable_native_backlight,
491 .ident = "ThinkPad X201s",
493 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
494 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
498 /* The native backlight controls do not work on some older machines */
500 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
501 .callback = video_disable_native_backlight,
502 .ident = "HP ENVY 15 Notebook",
504 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
511 static unsigned long long
512 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
513 unsigned long long bqc_value)
515 unsigned long long level;
517 if (device->brightness->flags._BQC_use_index) {
519 * _BQC returns an index that doesn't account for
520 * the first 2 items with special meaning, so we need
521 * to compensate for that by offsetting ourselves
523 if (device->brightness->flags._BCL_reversed)
524 bqc_value = device->brightness->count - 3 - bqc_value;
526 level = device->brightness->levels[bqc_value + 2];
531 level += bqc_offset_aml_bug_workaround;
537 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
538 unsigned long long *level, bool raw)
540 acpi_status status = AE_OK;
543 if (device->cap._BQC || device->cap._BCQ) {
544 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
546 status = acpi_evaluate_integer(device->dev->handle, buf,
548 if (ACPI_SUCCESS(status)) {
551 * Caller has indicated he wants the raw
552 * value returned by _BQC, so don't furtherly
553 * mess with the value.
558 *level = acpi_video_bqc_value_to_level(device, *level);
560 for (i = 2; i < device->brightness->count; i++)
561 if (device->brightness->levels[i] == *level) {
562 device->brightness->curr = *level;
566 * BQC returned an invalid level.
569 ACPI_WARNING((AE_INFO,
570 "%s returned an invalid level",
572 device->cap._BQC = device->cap._BCQ = 0;
576 * should we return an error or ignore this failure?
577 * dev->brightness->curr is a cached value which stores
578 * the correct current backlight level in most cases.
579 * ACPI video backlight still works w/ buggy _BQC.
580 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
582 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
583 device->cap._BQC = device->cap._BCQ = 0;
587 *level = device->brightness->curr;
592 acpi_video_device_EDID(struct acpi_video_device *device,
593 union acpi_object **edid, ssize_t length)
596 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
597 union acpi_object *obj;
598 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
599 struct acpi_object_list args = { 1, &arg0 };
607 arg0.integer.value = 1;
608 else if (length == 256)
609 arg0.integer.value = 2;
613 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
614 if (ACPI_FAILURE(status))
617 obj = buffer.pointer;
619 if (obj && obj->type == ACPI_TYPE_BUFFER)
622 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
634 * video : video bus device pointer
636 * 0. The system BIOS should NOT automatically switch(toggle)
637 * the active display output.
638 * 1. The system BIOS should automatically switch (toggle) the
639 * active display output. No switch event.
640 * 2. The _DGS value should be locked.
641 * 3. The system BIOS should not automatically switch (toggle) the
642 * active display output, but instead generate the display switch
645 * 0. The system BIOS should automatically control the brightness level
646 * of the LCD when the power changes from AC to DC
647 * 1. The system BIOS should NOT automatically control the brightness
648 * level of the LCD when the power changes from AC to DC.
654 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
658 if (!video->cap._DOS)
661 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
663 video->dos_setting = (lcd_flag << 2) | bios_flag;
664 status = acpi_execute_simple_method(video->device->handle, "_DOS",
665 (lcd_flag << 2) | bios_flag);
666 if (ACPI_FAILURE(status))
673 * Simple comparison function used to sort backlight levels.
677 acpi_video_cmp_level(const void *a, const void *b)
679 return *(int *)a - *(int *)b;
683 * Decides if _BQC/_BCQ for this system is usable
685 * We do this by changing the level first and then read out the current
686 * brightness level, if the value does not match, find out if it is using
687 * index. If not, clear the _BQC/_BCQ capability.
689 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
690 int max_level, int current_level)
692 struct acpi_video_device_brightness *br = device->brightness;
694 unsigned long long level;
697 /* don't mess with existing known broken systems */
698 if (bqc_offset_aml_bug_workaround)
702 * Some systems always report current brightness level as maximum
703 * through _BQC, we need to test another value for them.
705 test_level = current_level == max_level ? br->levels[3] : max_level;
707 result = acpi_video_device_lcd_set_level(device, test_level);
711 result = acpi_video_device_lcd_get_level_current(device, &level, true);
715 if (level != test_level) {
716 /* buggy _BQC found, need to find out if it uses index */
717 if (level < br->count) {
718 if (br->flags._BCL_reversed)
719 level = br->count - 3 - level;
720 if (br->levels[level + 2] == test_level)
721 br->flags._BQC_use_index = 1;
724 if (!br->flags._BQC_use_index)
725 device->cap._BQC = device->cap._BCQ = 0;
734 * device : video output device (LCD, CRT, ..)
737 * Maximum brightness level
739 * Allocate and initialize device->brightness.
743 acpi_video_init_brightness(struct acpi_video_device *device)
745 union acpi_object *obj = NULL;
746 int i, max_level = 0, count = 0, level_ac_battery = 0;
747 unsigned long long level, level_old;
748 union acpi_object *o;
749 struct acpi_video_device_brightness *br = NULL;
750 int result = -EINVAL;
753 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
754 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
755 "LCD brightness level\n"));
759 if (obj->package.count < 2)
762 br = kzalloc(sizeof(*br), GFP_KERNEL);
764 printk(KERN_ERR "can't allocate memory\n");
769 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
776 for (i = 0; i < obj->package.count; i++) {
777 o = (union acpi_object *)&obj->package.elements[i];
778 if (o->type != ACPI_TYPE_INTEGER) {
779 printk(KERN_ERR PREFIX "Invalid data\n");
782 value = (u32) o->integer.value;
783 /* Skip duplicate entries */
784 if (count > 2 && br->levels[count - 1] == value)
787 br->levels[count] = value;
789 if (br->levels[count] > max_level)
790 max_level = br->levels[count];
795 * some buggy BIOS don't export the levels
796 * when machine is on AC/Battery in _BCL package.
797 * In this case, the first two elements in _BCL packages
798 * are also supported brightness levels that OS should take care of.
800 for (i = 2; i < count; i++) {
801 if (br->levels[i] == br->levels[0])
803 if (br->levels[i] == br->levels[1])
807 if (level_ac_battery < 2) {
808 level_ac_battery = 2 - level_ac_battery;
809 br->flags._BCL_no_ac_battery_levels = 1;
810 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
811 br->levels[i] = br->levels[i - level_ac_battery];
812 count += level_ac_battery;
813 } else if (level_ac_battery > 2)
814 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
816 /* Check if the _BCL package is in a reversed order */
817 if (max_level == br->levels[2]) {
818 br->flags._BCL_reversed = 1;
819 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
820 acpi_video_cmp_level, NULL);
821 } else if (max_level != br->levels[count - 1])
823 "Found unordered _BCL package"));
826 device->brightness = br;
828 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
829 br->curr = level = max_level;
831 if (!device->cap._BQC)
834 result = acpi_video_device_lcd_get_level_current(device,
837 goto out_free_levels;
839 result = acpi_video_bqc_quirk(device, max_level, level_old);
841 goto out_free_levels;
843 * cap._BQC may get cleared due to _BQC is found to be broken
844 * in acpi_video_bqc_quirk, so check again here.
846 if (!device->cap._BQC)
849 level = acpi_video_bqc_value_to_level(device, level_old);
851 * On some buggy laptops, _BQC returns an uninitialized
852 * value when invoked for the first time, i.e.
853 * level_old is invalid (no matter whether it's a level
854 * or an index). Set the backlight to max_level in this case.
856 for (i = 2; i < br->count; i++)
857 if (level == br->levels[i])
859 if (i == br->count || !level)
863 result = acpi_video_device_lcd_set_level(device, level);
865 goto out_free_levels;
867 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
868 "found %d brightness levels\n", count - 2));
877 device->brightness = NULL;
884 * device : video output device (LCD, CRT, ..)
889 * Find out all required AML methods defined under the output
893 static void acpi_video_device_find_cap(struct acpi_video_device *device)
895 if (acpi_has_method(device->dev->handle, "_ADR"))
896 device->cap._ADR = 1;
897 if (acpi_has_method(device->dev->handle, "_BCL"))
898 device->cap._BCL = 1;
899 if (acpi_has_method(device->dev->handle, "_BCM"))
900 device->cap._BCM = 1;
901 if (acpi_has_method(device->dev->handle, "_BQC")) {
902 device->cap._BQC = 1;
903 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
904 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
905 device->cap._BCQ = 1;
908 if (acpi_has_method(device->dev->handle, "_DDC"))
909 device->cap._DDC = 1;
914 * device : video output device (VGA)
919 * Find out all required AML methods defined under the video bus device.
922 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
924 if (acpi_has_method(video->device->handle, "_DOS"))
926 if (acpi_has_method(video->device->handle, "_DOD"))
928 if (acpi_has_method(video->device->handle, "_ROM"))
930 if (acpi_has_method(video->device->handle, "_GPD"))
932 if (acpi_has_method(video->device->handle, "_SPD"))
934 if (acpi_has_method(video->device->handle, "_VPO"))
939 * Check whether the video bus device has required AML method to
940 * support the desired features
943 static int acpi_video_bus_check(struct acpi_video_bus *video)
945 acpi_status status = -ENOENT;
951 dev = acpi_get_pci_dev(video->device->handle);
957 * Since there is no HID, CID and so on for VGA driver, we have
958 * to check well known required nodes.
961 /* Does this device support video switching? */
962 if (video->cap._DOS || video->cap._DOD) {
963 if (!video->cap._DOS) {
964 printk(KERN_WARNING FW_BUG
965 "ACPI(%s) defines _DOD but not _DOS\n",
966 acpi_device_bid(video->device));
968 video->flags.multihead = 1;
972 /* Does this device support retrieving a video ROM? */
973 if (video->cap._ROM) {
974 video->flags.rom = 1;
978 /* Does this device support configuring which video device to POST? */
979 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
980 video->flags.post = 1;
988 * --------------------------------------------------------------------------
990 * --------------------------------------------------------------------------
993 /* device interface */
994 static struct acpi_video_device_attrib *
995 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
997 struct acpi_video_enumerated_device *ids;
1000 for (i = 0; i < video->attached_count; i++) {
1001 ids = &video->attached_array[i];
1002 if ((ids->value.int_val & 0xffff) == device_id)
1003 return &ids->value.attrib;
1010 acpi_video_get_device_type(struct acpi_video_bus *video,
1011 unsigned long device_id)
1013 struct acpi_video_enumerated_device *ids;
1016 for (i = 0; i < video->attached_count; i++) {
1017 ids = &video->attached_array[i];
1018 if ((ids->value.int_val & 0xffff) == device_id)
1019 return ids->value.int_val;
1026 acpi_video_bus_get_one_device(struct acpi_device *device,
1027 struct acpi_video_bus *video)
1029 unsigned long long device_id;
1030 int status, device_type;
1031 struct acpi_video_device *data;
1032 struct acpi_video_device_attrib *attribute;
1035 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1036 /* Some device omits _ADR, we skip them instead of fail */
1037 if (ACPI_FAILURE(status))
1040 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1044 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1045 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1046 device->driver_data = data;
1048 data->device_id = device_id;
1049 data->video = video;
1051 INIT_DELAYED_WORK(&data->switch_brightness_work,
1052 acpi_video_switch_brightness);
1054 attribute = acpi_video_get_device_attr(video, device_id);
1056 if (attribute && attribute->device_id_scheme) {
1057 switch (attribute->display_type) {
1058 case ACPI_VIDEO_DISPLAY_CRT:
1059 data->flags.crt = 1;
1061 case ACPI_VIDEO_DISPLAY_TV:
1062 data->flags.tvout = 1;
1064 case ACPI_VIDEO_DISPLAY_DVI:
1065 data->flags.dvi = 1;
1067 case ACPI_VIDEO_DISPLAY_LCD:
1068 data->flags.lcd = 1;
1071 data->flags.unknown = 1;
1074 if (attribute->bios_can_detect)
1075 data->flags.bios = 1;
1077 /* Check for legacy IDs */
1078 device_type = acpi_video_get_device_type(video, device_id);
1079 /* Ignore bits 16 and 18-20 */
1080 switch (device_type & 0xffe2ffff) {
1081 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1082 data->flags.crt = 1;
1084 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1085 data->flags.lcd = 1;
1087 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1088 data->flags.tvout = 1;
1091 data->flags.unknown = 1;
1095 acpi_video_device_bind(video, data);
1096 acpi_video_device_find_cap(data);
1098 mutex_lock(&video->device_list_lock);
1099 list_add_tail(&data->entry, &video->video_device_list);
1100 mutex_unlock(&video->device_list_lock);
1107 * video : video bus device
1112 * Enumerate the video device list of the video bus,
1113 * bind the ids with the corresponding video devices
1114 * under the video bus.
1117 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1119 struct acpi_video_device *dev;
1121 mutex_lock(&video->device_list_lock);
1123 list_for_each_entry(dev, &video->video_device_list, entry)
1124 acpi_video_device_bind(video, dev);
1126 mutex_unlock(&video->device_list_lock);
1131 * video : video bus device
1132 * device : video output device under the video
1138 * Bind the ids with the corresponding video devices
1139 * under the video bus.
1143 acpi_video_device_bind(struct acpi_video_bus *video,
1144 struct acpi_video_device *device)
1146 struct acpi_video_enumerated_device *ids;
1149 for (i = 0; i < video->attached_count; i++) {
1150 ids = &video->attached_array[i];
1151 if (device->device_id == (ids->value.int_val & 0xffff)) {
1152 ids->bind_info = device;
1153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1158 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1160 struct acpi_video_bus *video = device->video;
1164 * If we have a broken _DOD or we have more than 8 output devices
1165 * under the graphics controller node that we can't proper deal with
1166 * in the operation region code currently, no need to test.
1168 if (!video->attached_count || video->child_count > 8)
1171 for (i = 0; i < video->attached_count; i++) {
1172 if ((video->attached_array[i].value.int_val & 0xfff) ==
1173 (device->device_id & 0xfff))
1182 * video : video bus device
1187 * Call _DOD to enumerate all devices attached to display adapter
1191 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1196 struct acpi_video_enumerated_device *active_list;
1197 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1198 union acpi_object *dod = NULL;
1199 union acpi_object *obj;
1201 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1202 if (!ACPI_SUCCESS(status)) {
1203 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1207 dod = buffer.pointer;
1208 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1209 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1215 dod->package.count));
1217 active_list = kcalloc(1 + dod->package.count,
1218 sizeof(struct acpi_video_enumerated_device),
1226 for (i = 0; i < dod->package.count; i++) {
1227 obj = &dod->package.elements[i];
1229 if (obj->type != ACPI_TYPE_INTEGER) {
1230 printk(KERN_ERR PREFIX
1231 "Invalid _DOD data in element %d\n", i);
1235 active_list[count].value.int_val = obj->integer.value;
1236 active_list[count].bind_info = NULL;
1237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1238 (int)obj->integer.value));
1242 kfree(video->attached_array);
1244 video->attached_array = active_list;
1245 video->attached_count = count;
1248 kfree(buffer.pointer);
1253 acpi_video_get_next_level(struct acpi_video_device *device,
1254 u32 level_current, u32 event)
1256 int min, max, min_above, max_below, i, l, delta = 255;
1257 max = max_below = 0;
1258 min = min_above = 255;
1259 /* Find closest level to level_current */
1260 for (i = 2; i < device->brightness->count; i++) {
1261 l = device->brightness->levels[i];
1262 if (abs(l - level_current) < abs(delta)) {
1263 delta = l - level_current;
1268 /* Ajust level_current to closest available level */
1269 level_current += delta;
1270 for (i = 2; i < device->brightness->count; i++) {
1271 l = device->brightness->levels[i];
1276 if (l < min_above && l > level_current)
1278 if (l > max_below && l < level_current)
1283 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1284 return (level_current < max) ? min_above : min;
1285 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1286 return (level_current < max) ? min_above : max;
1287 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1288 return (level_current > min) ? max_below : min;
1289 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1290 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1293 return level_current;
1298 acpi_video_switch_brightness(struct work_struct *work)
1300 struct acpi_video_device *device = container_of(to_delayed_work(work),
1301 struct acpi_video_device, switch_brightness_work);
1302 unsigned long long level_current, level_next;
1303 int event = device->switch_brightness_event;
1304 int result = -EINVAL;
1306 /* no warning message if acpi_backlight=vendor or a quirk is used */
1307 if (!acpi_video_verify_backlight_support())
1310 if (!device->brightness)
1313 result = acpi_video_device_lcd_get_level_current(device,
1319 level_next = acpi_video_get_next_level(device, level_current, event);
1321 result = acpi_video_device_lcd_set_level(device, level_next);
1324 backlight_force_update(device->backlight,
1325 BACKLIGHT_UPDATE_HOTKEY);
1329 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1332 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1335 struct acpi_video_bus *video;
1336 struct acpi_video_device *video_device;
1337 union acpi_object *buffer = NULL;
1341 if (!device || !acpi_driver_data(device))
1344 video = acpi_driver_data(device);
1346 for (i = 0; i < video->attached_count; i++) {
1347 video_device = video->attached_array[i].bind_info;
1353 if (!video_device->cap._DDC)
1358 case ACPI_VIDEO_DISPLAY_CRT:
1359 if (!video_device->flags.crt)
1362 case ACPI_VIDEO_DISPLAY_TV:
1363 if (!video_device->flags.tvout)
1366 case ACPI_VIDEO_DISPLAY_DVI:
1367 if (!video_device->flags.dvi)
1370 case ACPI_VIDEO_DISPLAY_LCD:
1371 if (!video_device->flags.lcd)
1375 } else if (video_device->device_id != device_id) {
1379 status = acpi_video_device_EDID(video_device, &buffer, length);
1381 if (ACPI_FAILURE(status) || !buffer ||
1382 buffer->type != ACPI_TYPE_BUFFER) {
1384 status = acpi_video_device_EDID(video_device, &buffer,
1386 if (ACPI_FAILURE(status) || !buffer ||
1387 buffer->type != ACPI_TYPE_BUFFER) {
1392 *edid = buffer->buffer.pointer;
1398 EXPORT_SYMBOL(acpi_video_get_edid);
1401 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1402 struct acpi_device *device)
1405 struct acpi_device *dev;
1408 * There are systems where video module known to work fine regardless
1409 * of broken _DOD and ignoring returned value here doesn't cause
1412 acpi_video_device_enumerate(video);
1414 list_for_each_entry(dev, &device->children, node) {
1416 status = acpi_video_bus_get_one_device(dev, video);
1418 dev_err(&dev->dev, "Can't attach device\n");
1421 video->child_count++;
1426 /* acpi_video interface */
1429 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1430 * preform any automatic brightness change on receiving a notification.
1432 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1434 return acpi_video_bus_DOS(video, 0,
1435 acpi_osi_is_win8() ? 1 : 0);
1438 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1440 return acpi_video_bus_DOS(video, 0,
1441 acpi_osi_is_win8() ? 0 : 1);
1444 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1446 struct acpi_video_bus *video = acpi_driver_data(device);
1447 struct input_dev *input;
1450 if (!video || !video->input)
1453 input = video->input;
1456 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1457 * most likely via hotkey. */
1458 keycode = KEY_SWITCHVIDEOMODE;
1461 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1463 acpi_video_device_enumerate(video);
1464 acpi_video_device_rebind(video);
1465 keycode = KEY_SWITCHVIDEOMODE;
1468 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1469 keycode = KEY_SWITCHVIDEOMODE;
1471 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1472 keycode = KEY_VIDEO_NEXT;
1474 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1475 keycode = KEY_VIDEO_PREV;
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1480 "Unsupported event [0x%x]\n", event));
1484 if (acpi_notifier_call_chain(device, event, 0))
1485 /* Something vetoed the keypress. */
1489 input_report_key(input, keycode, 1);
1491 input_report_key(input, keycode, 0);
1498 static void brightness_switch_event(struct acpi_video_device *video_device,
1501 if (!brightness_switch_enabled)
1504 video_device->switch_brightness_event = event;
1505 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1508 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1510 struct acpi_video_device *video_device = data;
1511 struct acpi_device *device = NULL;
1512 struct acpi_video_bus *bus;
1513 struct input_dev *input;
1519 device = video_device->dev;
1520 bus = video_device->video;
1524 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1525 brightness_switch_event(video_device, event);
1526 keycode = KEY_BRIGHTNESS_CYCLE;
1528 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1529 brightness_switch_event(video_device, event);
1530 keycode = KEY_BRIGHTNESSUP;
1532 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1533 brightness_switch_event(video_device, event);
1534 keycode = KEY_BRIGHTNESSDOWN;
1536 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1537 brightness_switch_event(video_device, event);
1538 keycode = KEY_BRIGHTNESS_ZERO;
1540 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1541 brightness_switch_event(video_device, event);
1542 keycode = KEY_DISPLAY_OFF;
1545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1546 "Unsupported event [0x%x]\n", event));
1550 acpi_notifier_call_chain(device, event, 0);
1553 input_report_key(input, keycode, 1);
1555 input_report_key(input, keycode, 0);
1562 static int acpi_video_resume(struct notifier_block *nb,
1563 unsigned long val, void *ign)
1565 struct acpi_video_bus *video;
1566 struct acpi_video_device *video_device;
1570 case PM_HIBERNATION_PREPARE:
1571 case PM_SUSPEND_PREPARE:
1572 case PM_RESTORE_PREPARE:
1576 video = container_of(nb, struct acpi_video_bus, pm_nb);
1578 dev_info(&video->device->dev, "Restoring backlight state\n");
1580 for (i = 0; i < video->attached_count; i++) {
1581 video_device = video->attached_array[i].bind_info;
1582 if (video_device && video_device->backlight)
1583 acpi_video_set_brightness(video_device->backlight);
1590 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1591 void **return_value)
1593 struct acpi_device *device = context;
1594 struct acpi_device *sibling;
1597 if (handle == device->handle)
1598 return AE_CTRL_TERMINATE;
1600 result = acpi_bus_get_device(handle, &sibling);
1604 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1605 return AE_ALREADY_EXISTS;
1610 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1612 struct backlight_properties props;
1613 struct pci_dev *pdev;
1614 acpi_handle acpi_parent;
1615 struct device *parent = NULL;
1621 * Do not create backlight device for video output
1622 * device that is not in the enumerated list.
1624 if (!acpi_video_device_in_dod(device)) {
1625 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1629 result = acpi_video_init_brightness(device);
1632 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1637 acpi_get_parent(device->dev->handle, &acpi_parent);
1639 pdev = acpi_get_pci_dev(acpi_parent);
1641 parent = &pdev->dev;
1645 memset(&props, 0, sizeof(struct backlight_properties));
1646 props.type = BACKLIGHT_FIRMWARE;
1647 props.max_brightness = device->brightness->count - 3;
1648 device->backlight = backlight_device_register(name,
1651 &acpi_backlight_ops,
1654 if (IS_ERR(device->backlight))
1658 * Save current brightness level in case we have to restore it
1659 * before acpi_video_device_lcd_set_level() is called next time.
1661 device->backlight->props.brightness =
1662 acpi_video_get_brightness(device->backlight);
1664 device->cooling_dev = thermal_cooling_device_register("LCD",
1665 device->dev, &video_cooling_ops);
1666 if (IS_ERR(device->cooling_dev)) {
1668 * Set cooling_dev to NULL so we don't crash trying to free it.
1669 * Also, why the hell we are returning early and not attempt to
1670 * register video output if cooling device registration failed?
1673 device->cooling_dev = NULL;
1677 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1678 device->cooling_dev->id);
1679 result = sysfs_create_link(&device->dev->dev.kobj,
1680 &device->cooling_dev->device.kobj,
1683 printk(KERN_ERR PREFIX "Create sysfs link\n");
1684 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1685 &device->dev->dev.kobj, "device");
1687 printk(KERN_ERR PREFIX "Create sysfs link\n");
1690 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1692 struct acpi_video_device *dev;
1693 union acpi_object *levels;
1695 mutex_lock(&video->device_list_lock);
1696 list_for_each_entry(dev, &video->video_device_list, entry) {
1697 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1700 mutex_unlock(&video->device_list_lock);
1703 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1705 struct acpi_video_device *dev;
1707 if (video->backlight_registered)
1710 acpi_video_run_bcl_for_osi(video);
1712 if (!acpi_video_verify_backlight_support())
1715 mutex_lock(&video->device_list_lock);
1716 list_for_each_entry(dev, &video->video_device_list, entry)
1717 acpi_video_dev_register_backlight(dev);
1718 mutex_unlock(&video->device_list_lock);
1720 video->backlight_registered = true;
1722 video->pm_nb.notifier_call = acpi_video_resume;
1723 video->pm_nb.priority = 0;
1724 return register_pm_notifier(&video->pm_nb);
1727 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1729 if (device->backlight) {
1730 backlight_device_unregister(device->backlight);
1731 device->backlight = NULL;
1733 if (device->brightness) {
1734 kfree(device->brightness->levels);
1735 kfree(device->brightness);
1736 device->brightness = NULL;
1738 if (device->cooling_dev) {
1739 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1740 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1741 thermal_cooling_device_unregister(device->cooling_dev);
1742 device->cooling_dev = NULL;
1746 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1748 struct acpi_video_device *dev;
1751 if (!video->backlight_registered)
1754 error = unregister_pm_notifier(&video->pm_nb);
1756 mutex_lock(&video->device_list_lock);
1757 list_for_each_entry(dev, &video->video_device_list, entry)
1758 acpi_video_dev_unregister_backlight(dev);
1759 mutex_unlock(&video->device_list_lock);
1761 video->backlight_registered = false;
1766 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1769 struct acpi_device *adev = device->dev;
1771 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1772 acpi_video_device_notify, device);
1773 if (ACPI_FAILURE(status))
1774 dev_err(&adev->dev, "Error installing notify handler\n");
1776 device->flags.notify = 1;
1779 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1781 struct input_dev *input;
1782 struct acpi_video_device *dev;
1785 video->input = input = input_allocate_device();
1791 error = acpi_video_bus_start_devices(video);
1793 goto err_free_input;
1795 snprintf(video->phys, sizeof(video->phys),
1796 "%s/video/input0", acpi_device_hid(video->device));
1798 input->name = acpi_device_name(video->device);
1799 input->phys = video->phys;
1800 input->id.bustype = BUS_HOST;
1801 input->id.product = 0x06;
1802 input->dev.parent = &video->device->dev;
1803 input->evbit[0] = BIT(EV_KEY);
1804 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1805 set_bit(KEY_VIDEO_NEXT, input->keybit);
1806 set_bit(KEY_VIDEO_PREV, input->keybit);
1807 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1808 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1809 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1810 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1811 set_bit(KEY_DISPLAY_OFF, input->keybit);
1813 error = input_register_device(input);
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_add_notify_handler(dev);
1820 mutex_unlock(&video->device_list_lock);
1825 acpi_video_bus_stop_devices(video);
1827 input_free_device(input);
1828 video->input = NULL;
1833 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1835 if (dev->flags.notify) {
1836 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1837 acpi_video_device_notify);
1838 dev->flags.notify = 0;
1842 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1844 struct acpi_video_device *dev;
1846 mutex_lock(&video->device_list_lock);
1847 list_for_each_entry(dev, &video->video_device_list, entry)
1848 acpi_video_dev_remove_notify_handler(dev);
1849 mutex_unlock(&video->device_list_lock);
1851 acpi_video_bus_stop_devices(video);
1852 input_unregister_device(video->input);
1853 video->input = NULL;
1856 static int acpi_video_backlight_notify(struct notifier_block *nb,
1857 unsigned long val, void *bd)
1859 struct backlight_device *backlight = bd;
1860 struct acpi_video_bus *video;
1862 /* acpi_video_verify_backlight_support only cares about raw devices */
1863 if (backlight->props.type != BACKLIGHT_RAW)
1866 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1869 case BACKLIGHT_REGISTERED:
1870 if (!acpi_video_verify_backlight_support())
1871 acpi_video_bus_unregister_backlight(video);
1873 case BACKLIGHT_UNREGISTERED:
1874 acpi_video_bus_register_backlight(video);
1881 static int acpi_video_bus_add_backlight_notify_handler(
1882 struct acpi_video_bus *video)
1886 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1887 video->backlight_nb.priority = 0;
1888 error = backlight_register_notifier(&video->backlight_nb);
1890 video->backlight_notifier_registered = true;
1895 static int acpi_video_bus_remove_backlight_notify_handler(
1896 struct acpi_video_bus *video)
1898 if (!video->backlight_notifier_registered)
1901 video->backlight_notifier_registered = false;
1903 return backlight_unregister_notifier(&video->backlight_nb);
1906 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1908 struct acpi_video_device *dev, *next;
1910 mutex_lock(&video->device_list_lock);
1911 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1912 list_del(&dev->entry);
1915 mutex_unlock(&video->device_list_lock);
1920 static int instance;
1922 static int acpi_video_bus_add(struct acpi_device *device)
1924 struct acpi_video_bus *video;
1928 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1929 device->parent->handle, 1,
1930 acpi_video_bus_match, NULL,
1932 if (status == AE_ALREADY_EXISTS) {
1933 printk(KERN_WARNING FW_BUG
1934 "Duplicate ACPI video bus devices for the"
1935 " same VGA controller, please try module "
1936 "parameter \"video.allow_duplicates=1\""
1937 "if the current driver doesn't work.\n");
1938 if (!allow_duplicates)
1942 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1946 /* a hack to fix the duplicate name "VID" problem on T61 */
1947 if (!strcmp(device->pnp.bus_id, "VID")) {
1949 device->pnp.bus_id[3] = '0' + instance;
1952 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1953 if (!strcmp(device->pnp.bus_id, "VGA")) {
1955 device->pnp.bus_id[3] = '0' + instance;
1959 video->device = device;
1960 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1961 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1962 device->driver_data = video;
1964 acpi_video_bus_find_cap(video);
1965 error = acpi_video_bus_check(video);
1967 goto err_free_video;
1969 mutex_init(&video->device_list_lock);
1970 INIT_LIST_HEAD(&video->video_device_list);
1972 error = acpi_video_bus_get_devices(video, device);
1976 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1977 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1978 video->flags.multihead ? "yes" : "no",
1979 video->flags.rom ? "yes" : "no",
1980 video->flags.post ? "yes" : "no");
1981 mutex_lock(&video_list_lock);
1982 list_add_tail(&video->entry, &video_bus_head);
1983 mutex_unlock(&video_list_lock);
1985 acpi_video_bus_register_backlight(video);
1986 acpi_video_bus_add_notify_handler(video);
1987 acpi_video_bus_add_backlight_notify_handler(video);
1992 acpi_video_bus_put_devices(video);
1993 kfree(video->attached_array);
1996 device->driver_data = NULL;
2001 static int acpi_video_bus_remove(struct acpi_device *device)
2003 struct acpi_video_bus *video = NULL;
2006 if (!device || !acpi_driver_data(device))
2009 video = acpi_driver_data(device);
2011 acpi_video_bus_remove_backlight_notify_handler(video);
2012 acpi_video_bus_remove_notify_handler(video);
2013 acpi_video_bus_unregister_backlight(video);
2014 acpi_video_bus_put_devices(video);
2016 mutex_lock(&video_list_lock);
2017 list_del(&video->entry);
2018 mutex_unlock(&video_list_lock);
2020 kfree(video->attached_array);
2026 static int __init is_i740(struct pci_dev *dev)
2028 if (dev->device == 0x00D1)
2030 if (dev->device == 0x7000)
2035 static int __init intel_opregion_present(void)
2038 struct pci_dev *dev = NULL;
2041 for_each_pci_dev(dev) {
2042 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2044 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2046 /* We don't want to poke around undefined i740 registers */
2049 pci_read_config_dword(dev, 0xfc, &address);
2057 int acpi_video_register(void)
2060 if (register_count) {
2062 * if the function of acpi_video_register is already called,
2063 * don't register the acpi_vide_bus again and return no error.
2068 mutex_init(&video_list_lock);
2069 INIT_LIST_HEAD(&video_bus_head);
2071 result = acpi_bus_register_driver(&acpi_video_bus);
2076 * When the acpi_video_bus is loaded successfully, increase
2077 * the counter reference.
2083 EXPORT_SYMBOL(acpi_video_register);
2085 void acpi_video_unregister(void)
2087 if (!register_count) {
2089 * If the acpi video bus is already unloaded, don't
2090 * unload it again and return directly.
2094 acpi_bus_unregister_driver(&acpi_video_bus);
2100 EXPORT_SYMBOL(acpi_video_unregister);
2102 void acpi_video_unregister_backlight(void)
2104 struct acpi_video_bus *video;
2106 if (!register_count)
2109 mutex_lock(&video_list_lock);
2110 list_for_each_entry(video, &video_bus_head, entry)
2111 acpi_video_bus_unregister_backlight(video);
2112 mutex_unlock(&video_list_lock);
2114 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2117 * This is kind of nasty. Hardware using Intel chipsets may require
2118 * the video opregion code to be run first in order to initialise
2119 * state before any ACPI video calls are made. To handle this we defer
2120 * registration of the video class until the opregion code has run.
2123 static int __init acpi_video_init(void)
2125 dmi_check_system(video_dmi_table);
2127 if (intel_opregion_present())
2130 return acpi_video_register();
2133 static void __exit acpi_video_exit(void)
2135 acpi_video_unregister();
2140 module_init(acpi_video_init);
2141 module_exit(acpi_video_exit);