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"),
510 .callback = video_disable_native_backlight,
511 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
513 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
514 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
518 .callback = video_disable_native_backlight,
519 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
521 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
522 DMI_MATCH(DMI_PRODUCT_NAME, "370R4E/370R4V/370R5E/3570RE/370R5V"),
528 static unsigned long long
529 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
530 unsigned long long bqc_value)
532 unsigned long long level;
534 if (device->brightness->flags._BQC_use_index) {
536 * _BQC returns an index that doesn't account for
537 * the first 2 items with special meaning, so we need
538 * to compensate for that by offsetting ourselves
540 if (device->brightness->flags._BCL_reversed)
541 bqc_value = device->brightness->count - 3 - bqc_value;
543 level = device->brightness->levels[bqc_value + 2];
548 level += bqc_offset_aml_bug_workaround;
554 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
555 unsigned long long *level, bool raw)
557 acpi_status status = AE_OK;
560 if (device->cap._BQC || device->cap._BCQ) {
561 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
563 status = acpi_evaluate_integer(device->dev->handle, buf,
565 if (ACPI_SUCCESS(status)) {
568 * Caller has indicated he wants the raw
569 * value returned by _BQC, so don't furtherly
570 * mess with the value.
575 *level = acpi_video_bqc_value_to_level(device, *level);
577 for (i = 2; i < device->brightness->count; i++)
578 if (device->brightness->levels[i] == *level) {
579 device->brightness->curr = *level;
583 * BQC returned an invalid level.
586 ACPI_WARNING((AE_INFO,
587 "%s returned an invalid level",
589 device->cap._BQC = device->cap._BCQ = 0;
593 * should we return an error or ignore this failure?
594 * dev->brightness->curr is a cached value which stores
595 * the correct current backlight level in most cases.
596 * ACPI video backlight still works w/ buggy _BQC.
597 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
599 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
600 device->cap._BQC = device->cap._BCQ = 0;
604 *level = device->brightness->curr;
609 acpi_video_device_EDID(struct acpi_video_device *device,
610 union acpi_object **edid, ssize_t length)
613 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
614 union acpi_object *obj;
615 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
616 struct acpi_object_list args = { 1, &arg0 };
624 arg0.integer.value = 1;
625 else if (length == 256)
626 arg0.integer.value = 2;
630 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
631 if (ACPI_FAILURE(status))
634 obj = buffer.pointer;
636 if (obj && obj->type == ACPI_TYPE_BUFFER)
639 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
651 * video : video bus device pointer
653 * 0. The system BIOS should NOT automatically switch(toggle)
654 * the active display output.
655 * 1. The system BIOS should automatically switch (toggle) the
656 * active display output. No switch event.
657 * 2. The _DGS value should be locked.
658 * 3. The system BIOS should not automatically switch (toggle) the
659 * active display output, but instead generate the display switch
662 * 0. The system BIOS should automatically control the brightness level
663 * of the LCD when the power changes from AC to DC
664 * 1. The system BIOS should NOT automatically control the brightness
665 * level of the LCD when the power changes from AC to DC.
671 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
675 if (!video->cap._DOS)
678 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
680 video->dos_setting = (lcd_flag << 2) | bios_flag;
681 status = acpi_execute_simple_method(video->device->handle, "_DOS",
682 (lcd_flag << 2) | bios_flag);
683 if (ACPI_FAILURE(status))
690 * Simple comparison function used to sort backlight levels.
694 acpi_video_cmp_level(const void *a, const void *b)
696 return *(int *)a - *(int *)b;
700 * Decides if _BQC/_BCQ for this system is usable
702 * We do this by changing the level first and then read out the current
703 * brightness level, if the value does not match, find out if it is using
704 * index. If not, clear the _BQC/_BCQ capability.
706 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
707 int max_level, int current_level)
709 struct acpi_video_device_brightness *br = device->brightness;
711 unsigned long long level;
714 /* don't mess with existing known broken systems */
715 if (bqc_offset_aml_bug_workaround)
719 * Some systems always report current brightness level as maximum
720 * through _BQC, we need to test another value for them.
722 test_level = current_level == max_level ? br->levels[3] : max_level;
724 result = acpi_video_device_lcd_set_level(device, test_level);
728 result = acpi_video_device_lcd_get_level_current(device, &level, true);
732 if (level != test_level) {
733 /* buggy _BQC found, need to find out if it uses index */
734 if (level < br->count) {
735 if (br->flags._BCL_reversed)
736 level = br->count - 3 - level;
737 if (br->levels[level + 2] == test_level)
738 br->flags._BQC_use_index = 1;
741 if (!br->flags._BQC_use_index)
742 device->cap._BQC = device->cap._BCQ = 0;
751 * device : video output device (LCD, CRT, ..)
754 * Maximum brightness level
756 * Allocate and initialize device->brightness.
760 acpi_video_init_brightness(struct acpi_video_device *device)
762 union acpi_object *obj = NULL;
763 int i, max_level = 0, count = 0, level_ac_battery = 0;
764 unsigned long long level, level_old;
765 union acpi_object *o;
766 struct acpi_video_device_brightness *br = NULL;
767 int result = -EINVAL;
770 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
771 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
772 "LCD brightness level\n"));
776 if (obj->package.count < 2)
779 br = kzalloc(sizeof(*br), GFP_KERNEL);
781 printk(KERN_ERR "can't allocate memory\n");
786 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
793 for (i = 0; i < obj->package.count; i++) {
794 o = (union acpi_object *)&obj->package.elements[i];
795 if (o->type != ACPI_TYPE_INTEGER) {
796 printk(KERN_ERR PREFIX "Invalid data\n");
799 value = (u32) o->integer.value;
800 /* Skip duplicate entries */
801 if (count > 2 && br->levels[count - 1] == value)
804 br->levels[count] = value;
806 if (br->levels[count] > max_level)
807 max_level = br->levels[count];
812 * some buggy BIOS don't export the levels
813 * when machine is on AC/Battery in _BCL package.
814 * In this case, the first two elements in _BCL packages
815 * are also supported brightness levels that OS should take care of.
817 for (i = 2; i < count; i++) {
818 if (br->levels[i] == br->levels[0])
820 if (br->levels[i] == br->levels[1])
824 if (level_ac_battery < 2) {
825 level_ac_battery = 2 - level_ac_battery;
826 br->flags._BCL_no_ac_battery_levels = 1;
827 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
828 br->levels[i] = br->levels[i - level_ac_battery];
829 count += level_ac_battery;
830 } else if (level_ac_battery > 2)
831 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
833 /* Check if the _BCL package is in a reversed order */
834 if (max_level == br->levels[2]) {
835 br->flags._BCL_reversed = 1;
836 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
837 acpi_video_cmp_level, NULL);
838 } else if (max_level != br->levels[count - 1])
840 "Found unordered _BCL package"));
843 device->brightness = br;
845 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
846 br->curr = level = max_level;
848 if (!device->cap._BQC)
851 result = acpi_video_device_lcd_get_level_current(device,
854 goto out_free_levels;
856 result = acpi_video_bqc_quirk(device, max_level, level_old);
858 goto out_free_levels;
860 * cap._BQC may get cleared due to _BQC is found to be broken
861 * in acpi_video_bqc_quirk, so check again here.
863 if (!device->cap._BQC)
866 level = acpi_video_bqc_value_to_level(device, level_old);
868 * On some buggy laptops, _BQC returns an uninitialized
869 * value when invoked for the first time, i.e.
870 * level_old is invalid (no matter whether it's a level
871 * or an index). Set the backlight to max_level in this case.
873 for (i = 2; i < br->count; i++)
874 if (level == br->levels[i])
876 if (i == br->count || !level)
880 result = acpi_video_device_lcd_set_level(device, level);
882 goto out_free_levels;
884 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
885 "found %d brightness levels\n", count - 2));
894 device->brightness = NULL;
901 * device : video output device (LCD, CRT, ..)
906 * Find out all required AML methods defined under the output
910 static void acpi_video_device_find_cap(struct acpi_video_device *device)
912 if (acpi_has_method(device->dev->handle, "_ADR"))
913 device->cap._ADR = 1;
914 if (acpi_has_method(device->dev->handle, "_BCL"))
915 device->cap._BCL = 1;
916 if (acpi_has_method(device->dev->handle, "_BCM"))
917 device->cap._BCM = 1;
918 if (acpi_has_method(device->dev->handle, "_BQC")) {
919 device->cap._BQC = 1;
920 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
921 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
922 device->cap._BCQ = 1;
925 if (acpi_has_method(device->dev->handle, "_DDC"))
926 device->cap._DDC = 1;
931 * device : video output device (VGA)
936 * Find out all required AML methods defined under the video bus device.
939 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
941 if (acpi_has_method(video->device->handle, "_DOS"))
943 if (acpi_has_method(video->device->handle, "_DOD"))
945 if (acpi_has_method(video->device->handle, "_ROM"))
947 if (acpi_has_method(video->device->handle, "_GPD"))
949 if (acpi_has_method(video->device->handle, "_SPD"))
951 if (acpi_has_method(video->device->handle, "_VPO"))
956 * Check whether the video bus device has required AML method to
957 * support the desired features
960 static int acpi_video_bus_check(struct acpi_video_bus *video)
962 acpi_status status = -ENOENT;
968 dev = acpi_get_pci_dev(video->device->handle);
974 * Since there is no HID, CID and so on for VGA driver, we have
975 * to check well known required nodes.
978 /* Does this device support video switching? */
979 if (video->cap._DOS || video->cap._DOD) {
980 if (!video->cap._DOS) {
981 printk(KERN_WARNING FW_BUG
982 "ACPI(%s) defines _DOD but not _DOS\n",
983 acpi_device_bid(video->device));
985 video->flags.multihead = 1;
989 /* Does this device support retrieving a video ROM? */
990 if (video->cap._ROM) {
991 video->flags.rom = 1;
995 /* Does this device support configuring which video device to POST? */
996 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
997 video->flags.post = 1;
1005 * --------------------------------------------------------------------------
1007 * --------------------------------------------------------------------------
1010 /* device interface */
1011 static struct acpi_video_device_attrib *
1012 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1014 struct acpi_video_enumerated_device *ids;
1017 for (i = 0; i < video->attached_count; i++) {
1018 ids = &video->attached_array[i];
1019 if ((ids->value.int_val & 0xffff) == device_id)
1020 return &ids->value.attrib;
1027 acpi_video_get_device_type(struct acpi_video_bus *video,
1028 unsigned long device_id)
1030 struct acpi_video_enumerated_device *ids;
1033 for (i = 0; i < video->attached_count; i++) {
1034 ids = &video->attached_array[i];
1035 if ((ids->value.int_val & 0xffff) == device_id)
1036 return ids->value.int_val;
1043 acpi_video_bus_get_one_device(struct acpi_device *device,
1044 struct acpi_video_bus *video)
1046 unsigned long long device_id;
1047 int status, device_type;
1048 struct acpi_video_device *data;
1049 struct acpi_video_device_attrib *attribute;
1052 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1053 /* Some device omits _ADR, we skip them instead of fail */
1054 if (ACPI_FAILURE(status))
1057 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1061 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1062 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1063 device->driver_data = data;
1065 data->device_id = device_id;
1066 data->video = video;
1068 INIT_DELAYED_WORK(&data->switch_brightness_work,
1069 acpi_video_switch_brightness);
1071 attribute = acpi_video_get_device_attr(video, device_id);
1073 if (attribute && attribute->device_id_scheme) {
1074 switch (attribute->display_type) {
1075 case ACPI_VIDEO_DISPLAY_CRT:
1076 data->flags.crt = 1;
1078 case ACPI_VIDEO_DISPLAY_TV:
1079 data->flags.tvout = 1;
1081 case ACPI_VIDEO_DISPLAY_DVI:
1082 data->flags.dvi = 1;
1084 case ACPI_VIDEO_DISPLAY_LCD:
1085 data->flags.lcd = 1;
1088 data->flags.unknown = 1;
1091 if (attribute->bios_can_detect)
1092 data->flags.bios = 1;
1094 /* Check for legacy IDs */
1095 device_type = acpi_video_get_device_type(video, device_id);
1096 /* Ignore bits 16 and 18-20 */
1097 switch (device_type & 0xffe2ffff) {
1098 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1099 data->flags.crt = 1;
1101 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1102 data->flags.lcd = 1;
1104 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1105 data->flags.tvout = 1;
1108 data->flags.unknown = 1;
1112 acpi_video_device_bind(video, data);
1113 acpi_video_device_find_cap(data);
1115 mutex_lock(&video->device_list_lock);
1116 list_add_tail(&data->entry, &video->video_device_list);
1117 mutex_unlock(&video->device_list_lock);
1124 * video : video bus device
1129 * Enumerate the video device list of the video bus,
1130 * bind the ids with the corresponding video devices
1131 * under the video bus.
1134 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1136 struct acpi_video_device *dev;
1138 mutex_lock(&video->device_list_lock);
1140 list_for_each_entry(dev, &video->video_device_list, entry)
1141 acpi_video_device_bind(video, dev);
1143 mutex_unlock(&video->device_list_lock);
1148 * video : video bus device
1149 * device : video output device under the video
1155 * Bind the ids with the corresponding video devices
1156 * under the video bus.
1160 acpi_video_device_bind(struct acpi_video_bus *video,
1161 struct acpi_video_device *device)
1163 struct acpi_video_enumerated_device *ids;
1166 for (i = 0; i < video->attached_count; i++) {
1167 ids = &video->attached_array[i];
1168 if (device->device_id == (ids->value.int_val & 0xffff)) {
1169 ids->bind_info = device;
1170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1175 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1177 struct acpi_video_bus *video = device->video;
1181 * If we have a broken _DOD or we have more than 8 output devices
1182 * under the graphics controller node that we can't proper deal with
1183 * in the operation region code currently, no need to test.
1185 if (!video->attached_count || video->child_count > 8)
1188 for (i = 0; i < video->attached_count; i++) {
1189 if ((video->attached_array[i].value.int_val & 0xfff) ==
1190 (device->device_id & 0xfff))
1199 * video : video bus device
1204 * Call _DOD to enumerate all devices attached to display adapter
1208 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1213 struct acpi_video_enumerated_device *active_list;
1214 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1215 union acpi_object *dod = NULL;
1216 union acpi_object *obj;
1218 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1219 if (!ACPI_SUCCESS(status)) {
1220 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1224 dod = buffer.pointer;
1225 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1226 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1232 dod->package.count));
1234 active_list = kcalloc(1 + dod->package.count,
1235 sizeof(struct acpi_video_enumerated_device),
1243 for (i = 0; i < dod->package.count; i++) {
1244 obj = &dod->package.elements[i];
1246 if (obj->type != ACPI_TYPE_INTEGER) {
1247 printk(KERN_ERR PREFIX
1248 "Invalid _DOD data in element %d\n", i);
1252 active_list[count].value.int_val = obj->integer.value;
1253 active_list[count].bind_info = NULL;
1254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1255 (int)obj->integer.value));
1259 kfree(video->attached_array);
1261 video->attached_array = active_list;
1262 video->attached_count = count;
1265 kfree(buffer.pointer);
1270 acpi_video_get_next_level(struct acpi_video_device *device,
1271 u32 level_current, u32 event)
1273 int min, max, min_above, max_below, i, l, delta = 255;
1274 max = max_below = 0;
1275 min = min_above = 255;
1276 /* Find closest level to level_current */
1277 for (i = 2; i < device->brightness->count; i++) {
1278 l = device->brightness->levels[i];
1279 if (abs(l - level_current) < abs(delta)) {
1280 delta = l - level_current;
1285 /* Ajust level_current to closest available level */
1286 level_current += delta;
1287 for (i = 2; i < device->brightness->count; i++) {
1288 l = device->brightness->levels[i];
1293 if (l < min_above && l > level_current)
1295 if (l > max_below && l < level_current)
1300 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1301 return (level_current < max) ? min_above : min;
1302 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1303 return (level_current < max) ? min_above : max;
1304 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1305 return (level_current > min) ? max_below : min;
1306 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1307 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1310 return level_current;
1315 acpi_video_switch_brightness(struct work_struct *work)
1317 struct acpi_video_device *device = container_of(to_delayed_work(work),
1318 struct acpi_video_device, switch_brightness_work);
1319 unsigned long long level_current, level_next;
1320 int event = device->switch_brightness_event;
1321 int result = -EINVAL;
1323 /* no warning message if acpi_backlight=vendor or a quirk is used */
1324 if (!acpi_video_verify_backlight_support())
1327 if (!device->brightness)
1330 result = acpi_video_device_lcd_get_level_current(device,
1336 level_next = acpi_video_get_next_level(device, level_current, event);
1338 result = acpi_video_device_lcd_set_level(device, level_next);
1341 backlight_force_update(device->backlight,
1342 BACKLIGHT_UPDATE_HOTKEY);
1346 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1349 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1352 struct acpi_video_bus *video;
1353 struct acpi_video_device *video_device;
1354 union acpi_object *buffer = NULL;
1358 if (!device || !acpi_driver_data(device))
1361 video = acpi_driver_data(device);
1363 for (i = 0; i < video->attached_count; i++) {
1364 video_device = video->attached_array[i].bind_info;
1370 if (!video_device->cap._DDC)
1375 case ACPI_VIDEO_DISPLAY_CRT:
1376 if (!video_device->flags.crt)
1379 case ACPI_VIDEO_DISPLAY_TV:
1380 if (!video_device->flags.tvout)
1383 case ACPI_VIDEO_DISPLAY_DVI:
1384 if (!video_device->flags.dvi)
1387 case ACPI_VIDEO_DISPLAY_LCD:
1388 if (!video_device->flags.lcd)
1392 } else if (video_device->device_id != device_id) {
1396 status = acpi_video_device_EDID(video_device, &buffer, length);
1398 if (ACPI_FAILURE(status) || !buffer ||
1399 buffer->type != ACPI_TYPE_BUFFER) {
1401 status = acpi_video_device_EDID(video_device, &buffer,
1403 if (ACPI_FAILURE(status) || !buffer ||
1404 buffer->type != ACPI_TYPE_BUFFER) {
1409 *edid = buffer->buffer.pointer;
1415 EXPORT_SYMBOL(acpi_video_get_edid);
1418 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1419 struct acpi_device *device)
1422 struct acpi_device *dev;
1425 * There are systems where video module known to work fine regardless
1426 * of broken _DOD and ignoring returned value here doesn't cause
1429 acpi_video_device_enumerate(video);
1431 list_for_each_entry(dev, &device->children, node) {
1433 status = acpi_video_bus_get_one_device(dev, video);
1435 dev_err(&dev->dev, "Can't attach device\n");
1438 video->child_count++;
1443 /* acpi_video interface */
1446 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1447 * preform any automatic brightness change on receiving a notification.
1449 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1451 return acpi_video_bus_DOS(video, 0,
1452 acpi_osi_is_win8() ? 1 : 0);
1455 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1457 return acpi_video_bus_DOS(video, 0,
1458 acpi_osi_is_win8() ? 0 : 1);
1461 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1463 struct acpi_video_bus *video = acpi_driver_data(device);
1464 struct input_dev *input;
1467 if (!video || !video->input)
1470 input = video->input;
1473 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1474 * most likely via hotkey. */
1475 keycode = KEY_SWITCHVIDEOMODE;
1478 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1480 acpi_video_device_enumerate(video);
1481 acpi_video_device_rebind(video);
1482 keycode = KEY_SWITCHVIDEOMODE;
1485 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1486 keycode = KEY_SWITCHVIDEOMODE;
1488 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1489 keycode = KEY_VIDEO_NEXT;
1491 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1492 keycode = KEY_VIDEO_PREV;
1496 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1497 "Unsupported event [0x%x]\n", event));
1501 if (acpi_notifier_call_chain(device, event, 0))
1502 /* Something vetoed the keypress. */
1506 input_report_key(input, keycode, 1);
1508 input_report_key(input, keycode, 0);
1515 static void brightness_switch_event(struct acpi_video_device *video_device,
1518 if (!brightness_switch_enabled)
1521 video_device->switch_brightness_event = event;
1522 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1525 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1527 struct acpi_video_device *video_device = data;
1528 struct acpi_device *device = NULL;
1529 struct acpi_video_bus *bus;
1530 struct input_dev *input;
1536 device = video_device->dev;
1537 bus = video_device->video;
1541 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1542 brightness_switch_event(video_device, event);
1543 keycode = KEY_BRIGHTNESS_CYCLE;
1545 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1546 brightness_switch_event(video_device, event);
1547 keycode = KEY_BRIGHTNESSUP;
1549 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1550 brightness_switch_event(video_device, event);
1551 keycode = KEY_BRIGHTNESSDOWN;
1553 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1554 brightness_switch_event(video_device, event);
1555 keycode = KEY_BRIGHTNESS_ZERO;
1557 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1558 brightness_switch_event(video_device, event);
1559 keycode = KEY_DISPLAY_OFF;
1562 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1563 "Unsupported event [0x%x]\n", event));
1567 acpi_notifier_call_chain(device, event, 0);
1570 input_report_key(input, keycode, 1);
1572 input_report_key(input, keycode, 0);
1579 static int acpi_video_resume(struct notifier_block *nb,
1580 unsigned long val, void *ign)
1582 struct acpi_video_bus *video;
1583 struct acpi_video_device *video_device;
1587 case PM_HIBERNATION_PREPARE:
1588 case PM_SUSPEND_PREPARE:
1589 case PM_RESTORE_PREPARE:
1593 video = container_of(nb, struct acpi_video_bus, pm_nb);
1595 dev_info(&video->device->dev, "Restoring backlight state\n");
1597 for (i = 0; i < video->attached_count; i++) {
1598 video_device = video->attached_array[i].bind_info;
1599 if (video_device && video_device->backlight)
1600 acpi_video_set_brightness(video_device->backlight);
1607 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1608 void **return_value)
1610 struct acpi_device *device = context;
1611 struct acpi_device *sibling;
1614 if (handle == device->handle)
1615 return AE_CTRL_TERMINATE;
1617 result = acpi_bus_get_device(handle, &sibling);
1621 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1622 return AE_ALREADY_EXISTS;
1627 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1629 struct backlight_properties props;
1630 struct pci_dev *pdev;
1631 acpi_handle acpi_parent;
1632 struct device *parent = NULL;
1638 * Do not create backlight device for video output
1639 * device that is not in the enumerated list.
1641 if (!acpi_video_device_in_dod(device)) {
1642 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1646 result = acpi_video_init_brightness(device);
1649 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1654 acpi_get_parent(device->dev->handle, &acpi_parent);
1656 pdev = acpi_get_pci_dev(acpi_parent);
1658 parent = &pdev->dev;
1662 memset(&props, 0, sizeof(struct backlight_properties));
1663 props.type = BACKLIGHT_FIRMWARE;
1664 props.max_brightness = device->brightness->count - 3;
1665 device->backlight = backlight_device_register(name,
1668 &acpi_backlight_ops,
1671 if (IS_ERR(device->backlight))
1675 * Save current brightness level in case we have to restore it
1676 * before acpi_video_device_lcd_set_level() is called next time.
1678 device->backlight->props.brightness =
1679 acpi_video_get_brightness(device->backlight);
1681 device->cooling_dev = thermal_cooling_device_register("LCD",
1682 device->dev, &video_cooling_ops);
1683 if (IS_ERR(device->cooling_dev)) {
1685 * Set cooling_dev to NULL so we don't crash trying to free it.
1686 * Also, why the hell we are returning early and not attempt to
1687 * register video output if cooling device registration failed?
1690 device->cooling_dev = NULL;
1694 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1695 device->cooling_dev->id);
1696 result = sysfs_create_link(&device->dev->dev.kobj,
1697 &device->cooling_dev->device.kobj,
1700 printk(KERN_ERR PREFIX "Create sysfs link\n");
1701 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1702 &device->dev->dev.kobj, "device");
1704 printk(KERN_ERR PREFIX "Create sysfs link\n");
1707 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1709 struct acpi_video_device *dev;
1710 union acpi_object *levels;
1712 mutex_lock(&video->device_list_lock);
1713 list_for_each_entry(dev, &video->video_device_list, entry) {
1714 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1717 mutex_unlock(&video->device_list_lock);
1720 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1722 struct acpi_video_device *dev;
1724 if (video->backlight_registered)
1727 acpi_video_run_bcl_for_osi(video);
1729 if (!acpi_video_verify_backlight_support())
1732 mutex_lock(&video->device_list_lock);
1733 list_for_each_entry(dev, &video->video_device_list, entry)
1734 acpi_video_dev_register_backlight(dev);
1735 mutex_unlock(&video->device_list_lock);
1737 video->backlight_registered = true;
1739 video->pm_nb.notifier_call = acpi_video_resume;
1740 video->pm_nb.priority = 0;
1741 return register_pm_notifier(&video->pm_nb);
1744 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1746 if (device->backlight) {
1747 backlight_device_unregister(device->backlight);
1748 device->backlight = NULL;
1750 if (device->brightness) {
1751 kfree(device->brightness->levels);
1752 kfree(device->brightness);
1753 device->brightness = NULL;
1755 if (device->cooling_dev) {
1756 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1757 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1758 thermal_cooling_device_unregister(device->cooling_dev);
1759 device->cooling_dev = NULL;
1763 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1765 struct acpi_video_device *dev;
1768 if (!video->backlight_registered)
1771 error = unregister_pm_notifier(&video->pm_nb);
1773 mutex_lock(&video->device_list_lock);
1774 list_for_each_entry(dev, &video->video_device_list, entry)
1775 acpi_video_dev_unregister_backlight(dev);
1776 mutex_unlock(&video->device_list_lock);
1778 video->backlight_registered = false;
1783 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1786 struct acpi_device *adev = device->dev;
1788 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1789 acpi_video_device_notify, device);
1790 if (ACPI_FAILURE(status))
1791 dev_err(&adev->dev, "Error installing notify handler\n");
1793 device->flags.notify = 1;
1796 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1798 struct input_dev *input;
1799 struct acpi_video_device *dev;
1802 video->input = input = input_allocate_device();
1808 error = acpi_video_bus_start_devices(video);
1810 goto err_free_input;
1812 snprintf(video->phys, sizeof(video->phys),
1813 "%s/video/input0", acpi_device_hid(video->device));
1815 input->name = acpi_device_name(video->device);
1816 input->phys = video->phys;
1817 input->id.bustype = BUS_HOST;
1818 input->id.product = 0x06;
1819 input->dev.parent = &video->device->dev;
1820 input->evbit[0] = BIT(EV_KEY);
1821 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1822 set_bit(KEY_VIDEO_NEXT, input->keybit);
1823 set_bit(KEY_VIDEO_PREV, input->keybit);
1824 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1825 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1826 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1827 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1828 set_bit(KEY_DISPLAY_OFF, input->keybit);
1830 error = input_register_device(input);
1834 mutex_lock(&video->device_list_lock);
1835 list_for_each_entry(dev, &video->video_device_list, entry)
1836 acpi_video_dev_add_notify_handler(dev);
1837 mutex_unlock(&video->device_list_lock);
1842 acpi_video_bus_stop_devices(video);
1844 input_free_device(input);
1845 video->input = NULL;
1850 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1852 if (dev->flags.notify) {
1853 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1854 acpi_video_device_notify);
1855 dev->flags.notify = 0;
1859 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1861 struct acpi_video_device *dev;
1863 mutex_lock(&video->device_list_lock);
1864 list_for_each_entry(dev, &video->video_device_list, entry)
1865 acpi_video_dev_remove_notify_handler(dev);
1866 mutex_unlock(&video->device_list_lock);
1868 acpi_video_bus_stop_devices(video);
1869 input_unregister_device(video->input);
1870 video->input = NULL;
1873 static int acpi_video_backlight_notify(struct notifier_block *nb,
1874 unsigned long val, void *bd)
1876 struct backlight_device *backlight = bd;
1877 struct acpi_video_bus *video;
1879 /* acpi_video_verify_backlight_support only cares about raw devices */
1880 if (backlight->props.type != BACKLIGHT_RAW)
1883 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1886 case BACKLIGHT_REGISTERED:
1887 if (!acpi_video_verify_backlight_support())
1888 acpi_video_bus_unregister_backlight(video);
1890 case BACKLIGHT_UNREGISTERED:
1891 acpi_video_bus_register_backlight(video);
1898 static int acpi_video_bus_add_backlight_notify_handler(
1899 struct acpi_video_bus *video)
1903 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1904 video->backlight_nb.priority = 0;
1905 error = backlight_register_notifier(&video->backlight_nb);
1907 video->backlight_notifier_registered = true;
1912 static int acpi_video_bus_remove_backlight_notify_handler(
1913 struct acpi_video_bus *video)
1915 if (!video->backlight_notifier_registered)
1918 video->backlight_notifier_registered = false;
1920 return backlight_unregister_notifier(&video->backlight_nb);
1923 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1925 struct acpi_video_device *dev, *next;
1927 mutex_lock(&video->device_list_lock);
1928 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1929 list_del(&dev->entry);
1932 mutex_unlock(&video->device_list_lock);
1937 static int instance;
1939 static int acpi_video_bus_add(struct acpi_device *device)
1941 struct acpi_video_bus *video;
1945 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1946 device->parent->handle, 1,
1947 acpi_video_bus_match, NULL,
1949 if (status == AE_ALREADY_EXISTS) {
1950 printk(KERN_WARNING FW_BUG
1951 "Duplicate ACPI video bus devices for the"
1952 " same VGA controller, please try module "
1953 "parameter \"video.allow_duplicates=1\""
1954 "if the current driver doesn't work.\n");
1955 if (!allow_duplicates)
1959 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1963 /* a hack to fix the duplicate name "VID" problem on T61 */
1964 if (!strcmp(device->pnp.bus_id, "VID")) {
1966 device->pnp.bus_id[3] = '0' + instance;
1969 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1970 if (!strcmp(device->pnp.bus_id, "VGA")) {
1972 device->pnp.bus_id[3] = '0' + instance;
1976 video->device = device;
1977 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1978 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1979 device->driver_data = video;
1981 acpi_video_bus_find_cap(video);
1982 error = acpi_video_bus_check(video);
1984 goto err_free_video;
1986 mutex_init(&video->device_list_lock);
1987 INIT_LIST_HEAD(&video->video_device_list);
1989 error = acpi_video_bus_get_devices(video, device);
1993 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1994 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1995 video->flags.multihead ? "yes" : "no",
1996 video->flags.rom ? "yes" : "no",
1997 video->flags.post ? "yes" : "no");
1998 mutex_lock(&video_list_lock);
1999 list_add_tail(&video->entry, &video_bus_head);
2000 mutex_unlock(&video_list_lock);
2002 acpi_video_bus_register_backlight(video);
2003 acpi_video_bus_add_notify_handler(video);
2004 acpi_video_bus_add_backlight_notify_handler(video);
2009 acpi_video_bus_put_devices(video);
2010 kfree(video->attached_array);
2013 device->driver_data = NULL;
2018 static int acpi_video_bus_remove(struct acpi_device *device)
2020 struct acpi_video_bus *video = NULL;
2023 if (!device || !acpi_driver_data(device))
2026 video = acpi_driver_data(device);
2028 acpi_video_bus_remove_backlight_notify_handler(video);
2029 acpi_video_bus_remove_notify_handler(video);
2030 acpi_video_bus_unregister_backlight(video);
2031 acpi_video_bus_put_devices(video);
2033 mutex_lock(&video_list_lock);
2034 list_del(&video->entry);
2035 mutex_unlock(&video_list_lock);
2037 kfree(video->attached_array);
2043 static int __init is_i740(struct pci_dev *dev)
2045 if (dev->device == 0x00D1)
2047 if (dev->device == 0x7000)
2052 static int __init intel_opregion_present(void)
2055 struct pci_dev *dev = NULL;
2058 for_each_pci_dev(dev) {
2059 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2061 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2063 /* We don't want to poke around undefined i740 registers */
2066 pci_read_config_dword(dev, 0xfc, &address);
2074 int acpi_video_register(void)
2077 if (register_count) {
2079 * if the function of acpi_video_register is already called,
2080 * don't register the acpi_vide_bus again and return no error.
2085 mutex_init(&video_list_lock);
2086 INIT_LIST_HEAD(&video_bus_head);
2088 result = acpi_bus_register_driver(&acpi_video_bus);
2093 * When the acpi_video_bus is loaded successfully, increase
2094 * the counter reference.
2100 EXPORT_SYMBOL(acpi_video_register);
2102 void acpi_video_unregister(void)
2104 if (!register_count) {
2106 * If the acpi video bus is already unloaded, don't
2107 * unload it again and return directly.
2111 acpi_bus_unregister_driver(&acpi_video_bus);
2117 EXPORT_SYMBOL(acpi_video_unregister);
2119 void acpi_video_unregister_backlight(void)
2121 struct acpi_video_bus *video;
2123 if (!register_count)
2126 mutex_lock(&video_list_lock);
2127 list_for_each_entry(video, &video_bus_head, entry)
2128 acpi_video_bus_unregister_backlight(video);
2129 mutex_unlock(&video_list_lock);
2131 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2134 * This is kind of nasty. Hardware using Intel chipsets may require
2135 * the video opregion code to be run first in order to initialise
2136 * state before any ACPI video calls are made. To handle this we defer
2137 * registration of the video class until the opregion code has run.
2140 static int __init acpi_video_init(void)
2142 dmi_check_system(video_dmi_table);
2144 if (intel_opregion_present())
2147 return acpi_video_register();
2150 static void __exit acpi_video_exit(void)
2152 acpi_video_unregister();
2157 module_init(acpi_video_init);
2158 module_exit(acpi_video_exit);