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"),
527 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
528 .callback = video_disable_native_backlight,
529 .ident = "Dell XPS15 L521X",
531 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
532 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
538 static unsigned long long
539 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
540 unsigned long long bqc_value)
542 unsigned long long level;
544 if (device->brightness->flags._BQC_use_index) {
546 * _BQC returns an index that doesn't account for
547 * the first 2 items with special meaning, so we need
548 * to compensate for that by offsetting ourselves
550 if (device->brightness->flags._BCL_reversed)
551 bqc_value = device->brightness->count - 3 - bqc_value;
553 level = device->brightness->levels[bqc_value + 2];
558 level += bqc_offset_aml_bug_workaround;
564 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
565 unsigned long long *level, bool raw)
567 acpi_status status = AE_OK;
570 if (device->cap._BQC || device->cap._BCQ) {
571 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
573 status = acpi_evaluate_integer(device->dev->handle, buf,
575 if (ACPI_SUCCESS(status)) {
578 * Caller has indicated he wants the raw
579 * value returned by _BQC, so don't furtherly
580 * mess with the value.
585 *level = acpi_video_bqc_value_to_level(device, *level);
587 for (i = 2; i < device->brightness->count; i++)
588 if (device->brightness->levels[i] == *level) {
589 device->brightness->curr = *level;
593 * BQC returned an invalid level.
596 ACPI_WARNING((AE_INFO,
597 "%s returned an invalid level",
599 device->cap._BQC = device->cap._BCQ = 0;
603 * should we return an error or ignore this failure?
604 * dev->brightness->curr is a cached value which stores
605 * the correct current backlight level in most cases.
606 * ACPI video backlight still works w/ buggy _BQC.
607 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
609 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
610 device->cap._BQC = device->cap._BCQ = 0;
614 *level = device->brightness->curr;
619 acpi_video_device_EDID(struct acpi_video_device *device,
620 union acpi_object **edid, ssize_t length)
623 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
624 union acpi_object *obj;
625 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
626 struct acpi_object_list args = { 1, &arg0 };
634 arg0.integer.value = 1;
635 else if (length == 256)
636 arg0.integer.value = 2;
640 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
641 if (ACPI_FAILURE(status))
644 obj = buffer.pointer;
646 if (obj && obj->type == ACPI_TYPE_BUFFER)
649 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
661 * video : video bus device pointer
663 * 0. The system BIOS should NOT automatically switch(toggle)
664 * the active display output.
665 * 1. The system BIOS should automatically switch (toggle) the
666 * active display output. No switch event.
667 * 2. The _DGS value should be locked.
668 * 3. The system BIOS should not automatically switch (toggle) the
669 * active display output, but instead generate the display switch
672 * 0. The system BIOS should automatically control the brightness level
673 * of the LCD when the power changes from AC to DC
674 * 1. The system BIOS should NOT automatically control the brightness
675 * level of the LCD when the power changes from AC to DC.
681 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
685 if (!video->cap._DOS)
688 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
690 video->dos_setting = (lcd_flag << 2) | bios_flag;
691 status = acpi_execute_simple_method(video->device->handle, "_DOS",
692 (lcd_flag << 2) | bios_flag);
693 if (ACPI_FAILURE(status))
700 * Simple comparison function used to sort backlight levels.
704 acpi_video_cmp_level(const void *a, const void *b)
706 return *(int *)a - *(int *)b;
710 * Decides if _BQC/_BCQ for this system is usable
712 * We do this by changing the level first and then read out the current
713 * brightness level, if the value does not match, find out if it is using
714 * index. If not, clear the _BQC/_BCQ capability.
716 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
717 int max_level, int current_level)
719 struct acpi_video_device_brightness *br = device->brightness;
721 unsigned long long level;
724 /* don't mess with existing known broken systems */
725 if (bqc_offset_aml_bug_workaround)
729 * Some systems always report current brightness level as maximum
730 * through _BQC, we need to test another value for them.
732 test_level = current_level == max_level ? br->levels[3] : max_level;
734 result = acpi_video_device_lcd_set_level(device, test_level);
738 result = acpi_video_device_lcd_get_level_current(device, &level, true);
742 if (level != test_level) {
743 /* buggy _BQC found, need to find out if it uses index */
744 if (level < br->count) {
745 if (br->flags._BCL_reversed)
746 level = br->count - 3 - level;
747 if (br->levels[level + 2] == test_level)
748 br->flags._BQC_use_index = 1;
751 if (!br->flags._BQC_use_index)
752 device->cap._BQC = device->cap._BCQ = 0;
761 * device : video output device (LCD, CRT, ..)
764 * Maximum brightness level
766 * Allocate and initialize device->brightness.
770 acpi_video_init_brightness(struct acpi_video_device *device)
772 union acpi_object *obj = NULL;
773 int i, max_level = 0, count = 0, level_ac_battery = 0;
774 unsigned long long level, level_old;
775 union acpi_object *o;
776 struct acpi_video_device_brightness *br = NULL;
777 int result = -EINVAL;
780 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
781 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
782 "LCD brightness level\n"));
786 if (obj->package.count < 2)
789 br = kzalloc(sizeof(*br), GFP_KERNEL);
791 printk(KERN_ERR "can't allocate memory\n");
796 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
803 for (i = 0; i < obj->package.count; i++) {
804 o = (union acpi_object *)&obj->package.elements[i];
805 if (o->type != ACPI_TYPE_INTEGER) {
806 printk(KERN_ERR PREFIX "Invalid data\n");
809 value = (u32) o->integer.value;
810 /* Skip duplicate entries */
811 if (count > 2 && br->levels[count - 1] == value)
814 br->levels[count] = value;
816 if (br->levels[count] > max_level)
817 max_level = br->levels[count];
822 * some buggy BIOS don't export the levels
823 * when machine is on AC/Battery in _BCL package.
824 * In this case, the first two elements in _BCL packages
825 * are also supported brightness levels that OS should take care of.
827 for (i = 2; i < count; i++) {
828 if (br->levels[i] == br->levels[0])
830 if (br->levels[i] == br->levels[1])
834 if (level_ac_battery < 2) {
835 level_ac_battery = 2 - level_ac_battery;
836 br->flags._BCL_no_ac_battery_levels = 1;
837 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
838 br->levels[i] = br->levels[i - level_ac_battery];
839 count += level_ac_battery;
840 } else if (level_ac_battery > 2)
841 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
843 /* Check if the _BCL package is in a reversed order */
844 if (max_level == br->levels[2]) {
845 br->flags._BCL_reversed = 1;
846 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
847 acpi_video_cmp_level, NULL);
848 } else if (max_level != br->levels[count - 1])
850 "Found unordered _BCL package"));
853 device->brightness = br;
855 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
856 br->curr = level = max_level;
858 if (!device->cap._BQC)
861 result = acpi_video_device_lcd_get_level_current(device,
864 goto out_free_levels;
866 result = acpi_video_bqc_quirk(device, max_level, level_old);
868 goto out_free_levels;
870 * cap._BQC may get cleared due to _BQC is found to be broken
871 * in acpi_video_bqc_quirk, so check again here.
873 if (!device->cap._BQC)
876 level = acpi_video_bqc_value_to_level(device, level_old);
878 * On some buggy laptops, _BQC returns an uninitialized
879 * value when invoked for the first time, i.e.
880 * level_old is invalid (no matter whether it's a level
881 * or an index). Set the backlight to max_level in this case.
883 for (i = 2; i < br->count; i++)
884 if (level == br->levels[i])
886 if (i == br->count || !level)
890 result = acpi_video_device_lcd_set_level(device, level);
892 goto out_free_levels;
894 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
895 "found %d brightness levels\n", count - 2));
904 device->brightness = NULL;
911 * device : video output device (LCD, CRT, ..)
916 * Find out all required AML methods defined under the output
920 static void acpi_video_device_find_cap(struct acpi_video_device *device)
922 if (acpi_has_method(device->dev->handle, "_ADR"))
923 device->cap._ADR = 1;
924 if (acpi_has_method(device->dev->handle, "_BCL"))
925 device->cap._BCL = 1;
926 if (acpi_has_method(device->dev->handle, "_BCM"))
927 device->cap._BCM = 1;
928 if (acpi_has_method(device->dev->handle, "_BQC")) {
929 device->cap._BQC = 1;
930 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
931 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
932 device->cap._BCQ = 1;
935 if (acpi_has_method(device->dev->handle, "_DDC"))
936 device->cap._DDC = 1;
941 * device : video output device (VGA)
946 * Find out all required AML methods defined under the video bus device.
949 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
951 if (acpi_has_method(video->device->handle, "_DOS"))
953 if (acpi_has_method(video->device->handle, "_DOD"))
955 if (acpi_has_method(video->device->handle, "_ROM"))
957 if (acpi_has_method(video->device->handle, "_GPD"))
959 if (acpi_has_method(video->device->handle, "_SPD"))
961 if (acpi_has_method(video->device->handle, "_VPO"))
966 * Check whether the video bus device has required AML method to
967 * support the desired features
970 static int acpi_video_bus_check(struct acpi_video_bus *video)
972 acpi_status status = -ENOENT;
978 dev = acpi_get_pci_dev(video->device->handle);
984 * Since there is no HID, CID and so on for VGA driver, we have
985 * to check well known required nodes.
988 /* Does this device support video switching? */
989 if (video->cap._DOS || video->cap._DOD) {
990 if (!video->cap._DOS) {
991 printk(KERN_WARNING FW_BUG
992 "ACPI(%s) defines _DOD but not _DOS\n",
993 acpi_device_bid(video->device));
995 video->flags.multihead = 1;
999 /* Does this device support retrieving a video ROM? */
1000 if (video->cap._ROM) {
1001 video->flags.rom = 1;
1005 /* Does this device support configuring which video device to POST? */
1006 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1007 video->flags.post = 1;
1015 * --------------------------------------------------------------------------
1017 * --------------------------------------------------------------------------
1020 /* device interface */
1021 static struct acpi_video_device_attrib *
1022 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1024 struct acpi_video_enumerated_device *ids;
1027 for (i = 0; i < video->attached_count; i++) {
1028 ids = &video->attached_array[i];
1029 if ((ids->value.int_val & 0xffff) == device_id)
1030 return &ids->value.attrib;
1037 acpi_video_get_device_type(struct acpi_video_bus *video,
1038 unsigned long device_id)
1040 struct acpi_video_enumerated_device *ids;
1043 for (i = 0; i < video->attached_count; i++) {
1044 ids = &video->attached_array[i];
1045 if ((ids->value.int_val & 0xffff) == device_id)
1046 return ids->value.int_val;
1053 acpi_video_bus_get_one_device(struct acpi_device *device,
1054 struct acpi_video_bus *video)
1056 unsigned long long device_id;
1057 int status, device_type;
1058 struct acpi_video_device *data;
1059 struct acpi_video_device_attrib *attribute;
1062 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1063 /* Some device omits _ADR, we skip them instead of fail */
1064 if (ACPI_FAILURE(status))
1067 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1071 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1072 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1073 device->driver_data = data;
1075 data->device_id = device_id;
1076 data->video = video;
1078 INIT_DELAYED_WORK(&data->switch_brightness_work,
1079 acpi_video_switch_brightness);
1081 attribute = acpi_video_get_device_attr(video, device_id);
1083 if (attribute && attribute->device_id_scheme) {
1084 switch (attribute->display_type) {
1085 case ACPI_VIDEO_DISPLAY_CRT:
1086 data->flags.crt = 1;
1088 case ACPI_VIDEO_DISPLAY_TV:
1089 data->flags.tvout = 1;
1091 case ACPI_VIDEO_DISPLAY_DVI:
1092 data->flags.dvi = 1;
1094 case ACPI_VIDEO_DISPLAY_LCD:
1095 data->flags.lcd = 1;
1098 data->flags.unknown = 1;
1101 if (attribute->bios_can_detect)
1102 data->flags.bios = 1;
1104 /* Check for legacy IDs */
1105 device_type = acpi_video_get_device_type(video, device_id);
1106 /* Ignore bits 16 and 18-20 */
1107 switch (device_type & 0xffe2ffff) {
1108 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1109 data->flags.crt = 1;
1111 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1112 data->flags.lcd = 1;
1114 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1115 data->flags.tvout = 1;
1118 data->flags.unknown = 1;
1122 acpi_video_device_bind(video, data);
1123 acpi_video_device_find_cap(data);
1125 mutex_lock(&video->device_list_lock);
1126 list_add_tail(&data->entry, &video->video_device_list);
1127 mutex_unlock(&video->device_list_lock);
1134 * video : video bus device
1139 * Enumerate the video device list of the video bus,
1140 * bind the ids with the corresponding video devices
1141 * under the video bus.
1144 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1146 struct acpi_video_device *dev;
1148 mutex_lock(&video->device_list_lock);
1150 list_for_each_entry(dev, &video->video_device_list, entry)
1151 acpi_video_device_bind(video, dev);
1153 mutex_unlock(&video->device_list_lock);
1158 * video : video bus device
1159 * device : video output device under the video
1165 * Bind the ids with the corresponding video devices
1166 * under the video bus.
1170 acpi_video_device_bind(struct acpi_video_bus *video,
1171 struct acpi_video_device *device)
1173 struct acpi_video_enumerated_device *ids;
1176 for (i = 0; i < video->attached_count; i++) {
1177 ids = &video->attached_array[i];
1178 if (device->device_id == (ids->value.int_val & 0xffff)) {
1179 ids->bind_info = device;
1180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1185 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1187 struct acpi_video_bus *video = device->video;
1191 * If we have a broken _DOD or we have more than 8 output devices
1192 * under the graphics controller node that we can't proper deal with
1193 * in the operation region code currently, no need to test.
1195 if (!video->attached_count || video->child_count > 8)
1198 for (i = 0; i < video->attached_count; i++) {
1199 if ((video->attached_array[i].value.int_val & 0xfff) ==
1200 (device->device_id & 0xfff))
1209 * video : video bus device
1214 * Call _DOD to enumerate all devices attached to display adapter
1218 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1223 struct acpi_video_enumerated_device *active_list;
1224 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225 union acpi_object *dod = NULL;
1226 union acpi_object *obj;
1228 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1229 if (!ACPI_SUCCESS(status)) {
1230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1234 dod = buffer.pointer;
1235 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1236 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1241 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1242 dod->package.count));
1244 active_list = kcalloc(1 + dod->package.count,
1245 sizeof(struct acpi_video_enumerated_device),
1253 for (i = 0; i < dod->package.count; i++) {
1254 obj = &dod->package.elements[i];
1256 if (obj->type != ACPI_TYPE_INTEGER) {
1257 printk(KERN_ERR PREFIX
1258 "Invalid _DOD data in element %d\n", i);
1262 active_list[count].value.int_val = obj->integer.value;
1263 active_list[count].bind_info = NULL;
1264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1265 (int)obj->integer.value));
1269 kfree(video->attached_array);
1271 video->attached_array = active_list;
1272 video->attached_count = count;
1275 kfree(buffer.pointer);
1280 acpi_video_get_next_level(struct acpi_video_device *device,
1281 u32 level_current, u32 event)
1283 int min, max, min_above, max_below, i, l, delta = 255;
1284 max = max_below = 0;
1285 min = min_above = 255;
1286 /* Find closest level to level_current */
1287 for (i = 2; i < device->brightness->count; i++) {
1288 l = device->brightness->levels[i];
1289 if (abs(l - level_current) < abs(delta)) {
1290 delta = l - level_current;
1295 /* Ajust level_current to closest available level */
1296 level_current += delta;
1297 for (i = 2; i < device->brightness->count; i++) {
1298 l = device->brightness->levels[i];
1303 if (l < min_above && l > level_current)
1305 if (l > max_below && l < level_current)
1310 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1311 return (level_current < max) ? min_above : min;
1312 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1313 return (level_current < max) ? min_above : max;
1314 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1315 return (level_current > min) ? max_below : min;
1316 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1317 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1320 return level_current;
1325 acpi_video_switch_brightness(struct work_struct *work)
1327 struct acpi_video_device *device = container_of(to_delayed_work(work),
1328 struct acpi_video_device, switch_brightness_work);
1329 unsigned long long level_current, level_next;
1330 int event = device->switch_brightness_event;
1331 int result = -EINVAL;
1333 /* no warning message if acpi_backlight=vendor or a quirk is used */
1334 if (!acpi_video_verify_backlight_support())
1337 if (!device->brightness)
1340 result = acpi_video_device_lcd_get_level_current(device,
1346 level_next = acpi_video_get_next_level(device, level_current, event);
1348 result = acpi_video_device_lcd_set_level(device, level_next);
1351 backlight_force_update(device->backlight,
1352 BACKLIGHT_UPDATE_HOTKEY);
1356 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1359 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1362 struct acpi_video_bus *video;
1363 struct acpi_video_device *video_device;
1364 union acpi_object *buffer = NULL;
1368 if (!device || !acpi_driver_data(device))
1371 video = acpi_driver_data(device);
1373 for (i = 0; i < video->attached_count; i++) {
1374 video_device = video->attached_array[i].bind_info;
1380 if (!video_device->cap._DDC)
1385 case ACPI_VIDEO_DISPLAY_CRT:
1386 if (!video_device->flags.crt)
1389 case ACPI_VIDEO_DISPLAY_TV:
1390 if (!video_device->flags.tvout)
1393 case ACPI_VIDEO_DISPLAY_DVI:
1394 if (!video_device->flags.dvi)
1397 case ACPI_VIDEO_DISPLAY_LCD:
1398 if (!video_device->flags.lcd)
1402 } else if (video_device->device_id != device_id) {
1406 status = acpi_video_device_EDID(video_device, &buffer, length);
1408 if (ACPI_FAILURE(status) || !buffer ||
1409 buffer->type != ACPI_TYPE_BUFFER) {
1411 status = acpi_video_device_EDID(video_device, &buffer,
1413 if (ACPI_FAILURE(status) || !buffer ||
1414 buffer->type != ACPI_TYPE_BUFFER) {
1419 *edid = buffer->buffer.pointer;
1425 EXPORT_SYMBOL(acpi_video_get_edid);
1428 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1429 struct acpi_device *device)
1432 struct acpi_device *dev;
1435 * There are systems where video module known to work fine regardless
1436 * of broken _DOD and ignoring returned value here doesn't cause
1439 acpi_video_device_enumerate(video);
1441 list_for_each_entry(dev, &device->children, node) {
1443 status = acpi_video_bus_get_one_device(dev, video);
1445 dev_err(&dev->dev, "Can't attach device\n");
1448 video->child_count++;
1453 /* acpi_video interface */
1456 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1457 * preform any automatic brightness change on receiving a notification.
1459 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1461 return acpi_video_bus_DOS(video, 0,
1462 acpi_osi_is_win8() ? 1 : 0);
1465 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1467 return acpi_video_bus_DOS(video, 0,
1468 acpi_osi_is_win8() ? 0 : 1);
1471 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1473 struct acpi_video_bus *video = acpi_driver_data(device);
1474 struct input_dev *input;
1477 if (!video || !video->input)
1480 input = video->input;
1483 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1484 * most likely via hotkey. */
1485 keycode = KEY_SWITCHVIDEOMODE;
1488 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1490 acpi_video_device_enumerate(video);
1491 acpi_video_device_rebind(video);
1492 keycode = KEY_SWITCHVIDEOMODE;
1495 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1496 keycode = KEY_SWITCHVIDEOMODE;
1498 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1499 keycode = KEY_VIDEO_NEXT;
1501 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1502 keycode = KEY_VIDEO_PREV;
1506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1507 "Unsupported event [0x%x]\n", event));
1511 if (acpi_notifier_call_chain(device, event, 0))
1512 /* Something vetoed the keypress. */
1516 input_report_key(input, keycode, 1);
1518 input_report_key(input, keycode, 0);
1525 static void brightness_switch_event(struct acpi_video_device *video_device,
1528 if (!brightness_switch_enabled)
1531 video_device->switch_brightness_event = event;
1532 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1535 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1537 struct acpi_video_device *video_device = data;
1538 struct acpi_device *device = NULL;
1539 struct acpi_video_bus *bus;
1540 struct input_dev *input;
1546 device = video_device->dev;
1547 bus = video_device->video;
1551 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1552 brightness_switch_event(video_device, event);
1553 keycode = KEY_BRIGHTNESS_CYCLE;
1555 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1556 brightness_switch_event(video_device, event);
1557 keycode = KEY_BRIGHTNESSUP;
1559 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1560 brightness_switch_event(video_device, event);
1561 keycode = KEY_BRIGHTNESSDOWN;
1563 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1564 brightness_switch_event(video_device, event);
1565 keycode = KEY_BRIGHTNESS_ZERO;
1567 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1568 brightness_switch_event(video_device, event);
1569 keycode = KEY_DISPLAY_OFF;
1572 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1573 "Unsupported event [0x%x]\n", event));
1577 acpi_notifier_call_chain(device, event, 0);
1580 input_report_key(input, keycode, 1);
1582 input_report_key(input, keycode, 0);
1589 static int acpi_video_resume(struct notifier_block *nb,
1590 unsigned long val, void *ign)
1592 struct acpi_video_bus *video;
1593 struct acpi_video_device *video_device;
1597 case PM_HIBERNATION_PREPARE:
1598 case PM_SUSPEND_PREPARE:
1599 case PM_RESTORE_PREPARE:
1603 video = container_of(nb, struct acpi_video_bus, pm_nb);
1605 dev_info(&video->device->dev, "Restoring backlight state\n");
1607 for (i = 0; i < video->attached_count; i++) {
1608 video_device = video->attached_array[i].bind_info;
1609 if (video_device && video_device->backlight)
1610 acpi_video_set_brightness(video_device->backlight);
1617 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1618 void **return_value)
1620 struct acpi_device *device = context;
1621 struct acpi_device *sibling;
1624 if (handle == device->handle)
1625 return AE_CTRL_TERMINATE;
1627 result = acpi_bus_get_device(handle, &sibling);
1631 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1632 return AE_ALREADY_EXISTS;
1637 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1639 struct backlight_properties props;
1640 struct pci_dev *pdev;
1641 acpi_handle acpi_parent;
1642 struct device *parent = NULL;
1648 * Do not create backlight device for video output
1649 * device that is not in the enumerated list.
1651 if (!acpi_video_device_in_dod(device)) {
1652 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1656 result = acpi_video_init_brightness(device);
1659 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1664 acpi_get_parent(device->dev->handle, &acpi_parent);
1666 pdev = acpi_get_pci_dev(acpi_parent);
1668 parent = &pdev->dev;
1672 memset(&props, 0, sizeof(struct backlight_properties));
1673 props.type = BACKLIGHT_FIRMWARE;
1674 props.max_brightness = device->brightness->count - 3;
1675 device->backlight = backlight_device_register(name,
1678 &acpi_backlight_ops,
1681 if (IS_ERR(device->backlight))
1685 * Save current brightness level in case we have to restore it
1686 * before acpi_video_device_lcd_set_level() is called next time.
1688 device->backlight->props.brightness =
1689 acpi_video_get_brightness(device->backlight);
1691 device->cooling_dev = thermal_cooling_device_register("LCD",
1692 device->dev, &video_cooling_ops);
1693 if (IS_ERR(device->cooling_dev)) {
1695 * Set cooling_dev to NULL so we don't crash trying to free it.
1696 * Also, why the hell we are returning early and not attempt to
1697 * register video output if cooling device registration failed?
1700 device->cooling_dev = NULL;
1704 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1705 device->cooling_dev->id);
1706 result = sysfs_create_link(&device->dev->dev.kobj,
1707 &device->cooling_dev->device.kobj,
1710 printk(KERN_ERR PREFIX "Create sysfs link\n");
1711 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1712 &device->dev->dev.kobj, "device");
1714 printk(KERN_ERR PREFIX "Create sysfs link\n");
1717 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1719 struct acpi_video_device *dev;
1720 union acpi_object *levels;
1722 mutex_lock(&video->device_list_lock);
1723 list_for_each_entry(dev, &video->video_device_list, entry) {
1724 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1727 mutex_unlock(&video->device_list_lock);
1730 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1732 struct acpi_video_device *dev;
1734 if (video->backlight_registered)
1737 acpi_video_run_bcl_for_osi(video);
1739 if (!acpi_video_verify_backlight_support())
1742 mutex_lock(&video->device_list_lock);
1743 list_for_each_entry(dev, &video->video_device_list, entry)
1744 acpi_video_dev_register_backlight(dev);
1745 mutex_unlock(&video->device_list_lock);
1747 video->backlight_registered = true;
1749 video->pm_nb.notifier_call = acpi_video_resume;
1750 video->pm_nb.priority = 0;
1751 return register_pm_notifier(&video->pm_nb);
1754 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1756 if (device->backlight) {
1757 backlight_device_unregister(device->backlight);
1758 device->backlight = NULL;
1760 if (device->brightness) {
1761 kfree(device->brightness->levels);
1762 kfree(device->brightness);
1763 device->brightness = NULL;
1765 if (device->cooling_dev) {
1766 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1767 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1768 thermal_cooling_device_unregister(device->cooling_dev);
1769 device->cooling_dev = NULL;
1773 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1775 struct acpi_video_device *dev;
1778 if (!video->backlight_registered)
1781 error = unregister_pm_notifier(&video->pm_nb);
1783 mutex_lock(&video->device_list_lock);
1784 list_for_each_entry(dev, &video->video_device_list, entry)
1785 acpi_video_dev_unregister_backlight(dev);
1786 mutex_unlock(&video->device_list_lock);
1788 video->backlight_registered = false;
1793 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1796 struct acpi_device *adev = device->dev;
1798 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1799 acpi_video_device_notify, device);
1800 if (ACPI_FAILURE(status))
1801 dev_err(&adev->dev, "Error installing notify handler\n");
1803 device->flags.notify = 1;
1806 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1808 struct input_dev *input;
1809 struct acpi_video_device *dev;
1812 video->input = input = input_allocate_device();
1818 error = acpi_video_bus_start_devices(video);
1820 goto err_free_input;
1822 snprintf(video->phys, sizeof(video->phys),
1823 "%s/video/input0", acpi_device_hid(video->device));
1825 input->name = acpi_device_name(video->device);
1826 input->phys = video->phys;
1827 input->id.bustype = BUS_HOST;
1828 input->id.product = 0x06;
1829 input->dev.parent = &video->device->dev;
1830 input->evbit[0] = BIT(EV_KEY);
1831 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1832 set_bit(KEY_VIDEO_NEXT, input->keybit);
1833 set_bit(KEY_VIDEO_PREV, input->keybit);
1834 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1835 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1836 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1837 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1838 set_bit(KEY_DISPLAY_OFF, input->keybit);
1840 error = input_register_device(input);
1844 mutex_lock(&video->device_list_lock);
1845 list_for_each_entry(dev, &video->video_device_list, entry)
1846 acpi_video_dev_add_notify_handler(dev);
1847 mutex_unlock(&video->device_list_lock);
1852 acpi_video_bus_stop_devices(video);
1854 input_free_device(input);
1855 video->input = NULL;
1860 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1862 if (dev->flags.notify) {
1863 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1864 acpi_video_device_notify);
1865 dev->flags.notify = 0;
1869 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1871 struct acpi_video_device *dev;
1873 mutex_lock(&video->device_list_lock);
1874 list_for_each_entry(dev, &video->video_device_list, entry)
1875 acpi_video_dev_remove_notify_handler(dev);
1876 mutex_unlock(&video->device_list_lock);
1878 acpi_video_bus_stop_devices(video);
1879 input_unregister_device(video->input);
1880 video->input = NULL;
1883 static int acpi_video_backlight_notify(struct notifier_block *nb,
1884 unsigned long val, void *bd)
1886 struct backlight_device *backlight = bd;
1887 struct acpi_video_bus *video;
1889 /* acpi_video_verify_backlight_support only cares about raw devices */
1890 if (backlight->props.type != BACKLIGHT_RAW)
1893 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1896 case BACKLIGHT_REGISTERED:
1897 if (!acpi_video_verify_backlight_support())
1898 acpi_video_bus_unregister_backlight(video);
1900 case BACKLIGHT_UNREGISTERED:
1901 acpi_video_bus_register_backlight(video);
1908 static int acpi_video_bus_add_backlight_notify_handler(
1909 struct acpi_video_bus *video)
1913 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1914 video->backlight_nb.priority = 0;
1915 error = backlight_register_notifier(&video->backlight_nb);
1917 video->backlight_notifier_registered = true;
1922 static int acpi_video_bus_remove_backlight_notify_handler(
1923 struct acpi_video_bus *video)
1925 if (!video->backlight_notifier_registered)
1928 video->backlight_notifier_registered = false;
1930 return backlight_unregister_notifier(&video->backlight_nb);
1933 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1935 struct acpi_video_device *dev, *next;
1937 mutex_lock(&video->device_list_lock);
1938 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1939 list_del(&dev->entry);
1942 mutex_unlock(&video->device_list_lock);
1947 static int instance;
1949 static int acpi_video_bus_add(struct acpi_device *device)
1951 struct acpi_video_bus *video;
1955 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1956 device->parent->handle, 1,
1957 acpi_video_bus_match, NULL,
1959 if (status == AE_ALREADY_EXISTS) {
1960 printk(KERN_WARNING FW_BUG
1961 "Duplicate ACPI video bus devices for the"
1962 " same VGA controller, please try module "
1963 "parameter \"video.allow_duplicates=1\""
1964 "if the current driver doesn't work.\n");
1965 if (!allow_duplicates)
1969 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1973 /* a hack to fix the duplicate name "VID" problem on T61 */
1974 if (!strcmp(device->pnp.bus_id, "VID")) {
1976 device->pnp.bus_id[3] = '0' + instance;
1979 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1980 if (!strcmp(device->pnp.bus_id, "VGA")) {
1982 device->pnp.bus_id[3] = '0' + instance;
1986 video->device = device;
1987 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1988 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1989 device->driver_data = video;
1991 acpi_video_bus_find_cap(video);
1992 error = acpi_video_bus_check(video);
1994 goto err_free_video;
1996 mutex_init(&video->device_list_lock);
1997 INIT_LIST_HEAD(&video->video_device_list);
1999 error = acpi_video_bus_get_devices(video, device);
2003 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2004 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2005 video->flags.multihead ? "yes" : "no",
2006 video->flags.rom ? "yes" : "no",
2007 video->flags.post ? "yes" : "no");
2008 mutex_lock(&video_list_lock);
2009 list_add_tail(&video->entry, &video_bus_head);
2010 mutex_unlock(&video_list_lock);
2012 acpi_video_bus_register_backlight(video);
2013 acpi_video_bus_add_notify_handler(video);
2014 acpi_video_bus_add_backlight_notify_handler(video);
2019 acpi_video_bus_put_devices(video);
2020 kfree(video->attached_array);
2023 device->driver_data = NULL;
2028 static int acpi_video_bus_remove(struct acpi_device *device)
2030 struct acpi_video_bus *video = NULL;
2033 if (!device || !acpi_driver_data(device))
2036 video = acpi_driver_data(device);
2038 acpi_video_bus_remove_backlight_notify_handler(video);
2039 acpi_video_bus_remove_notify_handler(video);
2040 acpi_video_bus_unregister_backlight(video);
2041 acpi_video_bus_put_devices(video);
2043 mutex_lock(&video_list_lock);
2044 list_del(&video->entry);
2045 mutex_unlock(&video_list_lock);
2047 kfree(video->attached_array);
2053 static int __init is_i740(struct pci_dev *dev)
2055 if (dev->device == 0x00D1)
2057 if (dev->device == 0x7000)
2062 static int __init intel_opregion_present(void)
2065 struct pci_dev *dev = NULL;
2068 for_each_pci_dev(dev) {
2069 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2071 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2073 /* We don't want to poke around undefined i740 registers */
2076 pci_read_config_dword(dev, 0xfc, &address);
2084 int acpi_video_register(void)
2087 if (register_count) {
2089 * if the function of acpi_video_register is already called,
2090 * don't register the acpi_vide_bus again and return no error.
2095 mutex_init(&video_list_lock);
2096 INIT_LIST_HEAD(&video_bus_head);
2098 result = acpi_bus_register_driver(&acpi_video_bus);
2103 * When the acpi_video_bus is loaded successfully, increase
2104 * the counter reference.
2110 EXPORT_SYMBOL(acpi_video_register);
2112 void acpi_video_unregister(void)
2114 if (!register_count) {
2116 * If the acpi video bus is already unloaded, don't
2117 * unload it again and return directly.
2121 acpi_bus_unregister_driver(&acpi_video_bus);
2127 EXPORT_SYMBOL(acpi_video_unregister);
2129 void acpi_video_unregister_backlight(void)
2131 struct acpi_video_bus *video;
2133 if (!register_count)
2136 mutex_lock(&video_list_lock);
2137 list_for_each_entry(video, &video_bus_head, entry)
2138 acpi_video_bus_unregister_backlight(video);
2139 mutex_unlock(&video_list_lock);
2141 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2144 * This is kind of nasty. Hardware using Intel chipsets may require
2145 * the video opregion code to be run first in order to initialise
2146 * state before any ACPI video calls are made. To handle this we defer
2147 * registration of the video class until the opregion code has run.
2150 static int __init acpi_video_init(void)
2152 dmi_check_system(video_dmi_table);
2154 if (intel_opregion_present())
2157 return acpi_video_register();
2160 static void __exit acpi_video_exit(void)
2162 acpi_video_unregister();
2167 module_init(acpi_video_init);
2168 module_exit(acpi_video_exit);