1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * video.c - ACPI Video Driver
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/input.h>
17 #include <linux/backlight.h>
18 #include <linux/thermal.h>
19 #include <linux/sort.h>
20 #include <linux/pci.h>
21 #include <linux/pci_ids.h>
22 #include <linux/slab.h>
23 #include <linux/dmi.h>
24 #include <linux/suspend.h>
25 #include <linux/acpi.h>
26 #include <acpi/video.h>
27 #include <linux/uaccess.h>
29 #define PREFIX "ACPI: "
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
34 #define MAX_NAME_LEN 20
36 #define _COMPONENT ACPI_VIDEO_COMPONENT
37 ACPI_MODULE_NAME("video");
39 MODULE_AUTHOR("Bruno Ducrot");
40 MODULE_DESCRIPTION("ACPI Video Driver");
41 MODULE_LICENSE("GPL");
43 static bool brightness_switch_enabled = true;
44 module_param(brightness_switch_enabled, bool, 0644);
47 * By default, we don't allow duplicate ACPI video bus devices
48 * under the same VGA controller
50 static bool allow_duplicates;
51 module_param(allow_duplicates, bool, 0644);
53 static int disable_backlight_sysfs_if = -1;
54 module_param(disable_backlight_sysfs_if, int, 0444);
56 #define REPORT_OUTPUT_KEY_EVENTS 0x01
57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
58 static int report_key_events = -1;
59 module_param(report_key_events, int, 0644);
60 MODULE_PARM_DESC(report_key_events,
61 "0: none, 1: output changes, 2: brightness changes, 3: all");
64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
65 * assumed even if not actually set.
67 static bool device_id_scheme = false;
68 module_param(device_id_scheme, bool, 0444);
70 static int only_lcd = -1;
71 module_param(only_lcd, int, 0444);
73 static int register_count;
74 static DEFINE_MUTEX(register_count_mutex);
75 static DEFINE_MUTEX(video_list_lock);
76 static LIST_HEAD(video_bus_head);
77 static int acpi_video_bus_add(struct acpi_device *device);
78 static int acpi_video_bus_remove(struct acpi_device *device);
79 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
80 void acpi_video_detect_exit(void);
83 * Indices in the _BCL method response: the first two items are special,
84 * the rest are all supported levels.
86 * See page 575 of the ACPI spec 3.0
88 enum acpi_video_level_idx {
89 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
90 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
91 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
94 static const struct acpi_device_id video_device_ids[] = {
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100 static struct acpi_driver acpi_video_bus = {
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .notify = acpi_video_bus_notify,
111 struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
118 struct acpi_video_bus_cap {
119 u8 _DOS:1; /* Enable/Disable output switching */
120 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /* Get ROM Data */
122 u8 _GPD:1; /* Get POST Device */
123 u8 _SPD:1; /* Set POST Device */
124 u8 _VPO:1; /* Video POST Options */
128 struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /* This field differentiates the display type */
131 u32 display_type:4; /* Describe the specific type in use */
132 u32 vendor_specific:4; /* Chipset Vendor Specific */
133 u32 bios_can_detect:1; /* BIOS can detect the device */
134 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
136 u32 pipe_id:3; /* For VGA multiple-head devices. */
137 u32 reserved:10; /* Must be 0 */
140 * The device ID might not actually follow the scheme described by this
141 * struct acpi_video_device_attrib. If it does, then this bit
142 * device_id_scheme is set; otherwise, other fields should be ignored.
144 * (but also see the global flag device_id_scheme)
146 u32 device_id_scheme:1;
149 struct acpi_video_enumerated_device {
152 struct acpi_video_device_attrib attrib;
154 struct acpi_video_device *bind_info;
157 struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
161 struct acpi_video_enumerated_device *attached_array;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
174 struct acpi_video_device_flags {
185 struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
194 struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct delayed_work switch_brightness_work;
200 int switch_brightness_event;
201 struct acpi_video_bus *video;
202 struct acpi_device *dev;
203 struct acpi_video_device_brightness *brightness;
204 struct backlight_device *backlight;
205 struct thermal_cooling_device *cooling_dev;
208 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
209 static void acpi_video_device_rebind(struct acpi_video_bus *video);
210 static void acpi_video_device_bind(struct acpi_video_bus *video,
211 struct acpi_video_device *device);
212 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
213 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
215 static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device *device,
217 unsigned long long *level, bool raw);
218 static int acpi_video_get_next_level(struct acpi_video_device *device,
219 u32 level_current, u32 event);
220 static void acpi_video_switch_brightness(struct work_struct *work);
222 /* backlight device sysfs support */
223 static int acpi_video_get_brightness(struct backlight_device *bd)
225 unsigned long long cur_level;
227 struct acpi_video_device *vd = bl_get_data(bd);
229 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
231 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
232 if (vd->brightness->levels[i] == cur_level)
233 return i - ACPI_VIDEO_FIRST_LEVEL;
238 static int acpi_video_set_brightness(struct backlight_device *bd)
240 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
241 struct acpi_video_device *vd = bl_get_data(bd);
243 cancel_delayed_work(&vd->switch_brightness_work);
244 return acpi_video_device_lcd_set_level(vd,
245 vd->brightness->levels[request_level]);
248 static const struct backlight_ops acpi_backlight_ops = {
249 .get_brightness = acpi_video_get_brightness,
250 .update_status = acpi_video_set_brightness,
253 /* thermal cooling device callbacks */
254 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
255 unsigned long *state)
257 struct acpi_device *device = cooling_dev->devdata;
258 struct acpi_video_device *video = acpi_driver_data(device);
260 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
264 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
265 unsigned long *state)
267 struct acpi_device *device = cooling_dev->devdata;
268 struct acpi_video_device *video = acpi_driver_data(device);
269 unsigned long long level;
272 if (acpi_video_device_lcd_get_level_current(video, &level, false))
274 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
276 if (level == video->brightness->levels[offset]) {
277 *state = video->brightness->count - offset - 1;
285 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
287 struct acpi_device *device = cooling_dev->devdata;
288 struct acpi_video_device *video = acpi_driver_data(device);
291 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
294 state = video->brightness->count - state;
295 level = video->brightness->levels[state - 1];
296 return acpi_video_device_lcd_set_level(video, level);
299 static const struct thermal_cooling_device_ops video_cooling_ops = {
300 .get_max_state = video_get_max_state,
301 .get_cur_state = video_get_cur_state,
302 .set_cur_state = video_set_cur_state,
306 * --------------------------------------------------------------------------
308 * --------------------------------------------------------------------------
312 acpi_video_device_lcd_query_levels(acpi_handle handle,
313 union acpi_object **levels)
316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
317 union acpi_object *obj;
322 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
323 if (!ACPI_SUCCESS(status))
325 obj = (union acpi_object *)buffer.pointer;
326 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
327 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
337 kfree(buffer.pointer);
343 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
348 status = acpi_execute_simple_method(device->dev->handle,
350 if (ACPI_FAILURE(status)) {
351 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
355 device->brightness->curr = level;
356 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
358 if (level == device->brightness->levels[state]) {
359 if (device->backlight)
360 device->backlight->props.brightness =
361 state - ACPI_VIDEO_FIRST_LEVEL;
365 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
370 * For some buggy _BQC methods, we need to add a constant value to
371 * the _BQC return value to get the actual current brightness level
374 static int bqc_offset_aml_bug_workaround;
375 static int video_set_bqc_offset(const struct dmi_system_id *d)
377 bqc_offset_aml_bug_workaround = 9;
381 static int video_disable_backlight_sysfs_if(
382 const struct dmi_system_id *d)
384 if (disable_backlight_sysfs_if == -1)
385 disable_backlight_sysfs_if = 1;
389 static int video_set_device_id_scheme(const struct dmi_system_id *d)
391 device_id_scheme = true;
395 static int video_enable_only_lcd(const struct dmi_system_id *d)
401 static int video_set_report_key_events(const struct dmi_system_id *id)
403 if (report_key_events == -1)
404 report_key_events = (uintptr_t)id->driver_data;
408 static const struct dmi_system_id video_dmi_table[] = {
410 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
413 .callback = video_set_bqc_offset,
414 .ident = "Acer Aspire 5720",
416 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
421 .callback = video_set_bqc_offset,
422 .ident = "Acer Aspire 5710Z",
424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
429 .callback = video_set_bqc_offset,
430 .ident = "eMachines E510",
432 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
433 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
437 .callback = video_set_bqc_offset,
438 .ident = "Acer Aspire 5315",
440 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
441 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
445 .callback = video_set_bqc_offset,
446 .ident = "Acer Aspire 7720",
448 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
449 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
454 * Some machines have a broken acpi-video interface for brightness
455 * control, but still need an acpi_video_device_lcd_set_level() call
456 * on resume to turn the backlight power on. We Enable backlight
457 * control on these systems, but do not register a backlight sysfs
458 * as brightness control does not work.
461 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
462 .callback = video_disable_backlight_sysfs_if,
463 .ident = "Toshiba Portege R700",
465 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
466 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
470 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
471 .callback = video_disable_backlight_sysfs_if,
472 .ident = "Toshiba Portege R830",
474 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
475 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
479 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
480 .callback = video_disable_backlight_sysfs_if,
481 .ident = "Toshiba Satellite R830",
483 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
484 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
488 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
489 * but the IDs actually follow the Device ID Scheme.
492 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
493 .callback = video_set_device_id_scheme,
494 .ident = "ESPRIMO Mobile M9410",
496 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
497 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
501 * Some machines have multiple video output devices, but only the one
502 * that is the type of LCD can do the backlight control so we should not
503 * register backlight interface for other video output devices.
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback = video_enable_only_lcd,
508 .ident = "ESPRIMO Mobile M9410",
510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
515 * Some machines report wrong key events on the acpi-bus, suppress
516 * key event reporting on these. Note this is only intended to work
517 * around events which are plain wrong. In some cases we get double
518 * events, in this case acpi-video is considered the canonical source
519 * and the events from the other source should be filtered. E.g.
520 * by calling acpi_video_handles_brightness_key_presses() from the
521 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
524 .callback = video_set_report_key_events,
525 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
526 .ident = "Dell Vostro V131",
528 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
529 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
535 static unsigned long long
536 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
537 unsigned long long bqc_value)
539 unsigned long long level;
541 if (device->brightness->flags._BQC_use_index) {
543 * _BQC returns an index that doesn't account for the first 2
544 * items with special meaning (see enum acpi_video_level_idx),
545 * so we need to compensate for that by offsetting ourselves
547 if (device->brightness->flags._BCL_reversed)
548 bqc_value = device->brightness->count -
549 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
551 level = device->brightness->levels[bqc_value +
552 ACPI_VIDEO_FIRST_LEVEL];
557 level += bqc_offset_aml_bug_workaround;
563 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
564 unsigned long long *level, bool raw)
566 acpi_status status = AE_OK;
569 if (device->cap._BQC || device->cap._BCQ) {
570 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
572 status = acpi_evaluate_integer(device->dev->handle, buf,
574 if (ACPI_SUCCESS(status)) {
577 * Caller has indicated he wants the raw
578 * value returned by _BQC, so don't furtherly
579 * mess with the value.
584 *level = acpi_video_bqc_value_to_level(device, *level);
586 for (i = ACPI_VIDEO_FIRST_LEVEL;
587 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. However,
731 * there is a subtlety:
733 * If the _BCL package ordering is descending, the first level
734 * (br->levels[2]) is likely to be 0, and if the number of levels
735 * matches the number of steps, we might confuse a returned level to
740 * current_level = max_level = 100
742 * returned level = 100
744 * In this case 100 means the level, not the index, and _BCM failed.
745 * Still, if the _BCL package ordering is descending, the index of
746 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
748 * This causes all _BQC calls to return bogus values causing weird
749 * behavior from the user's perspective. For example:
751 * xbacklight -set 10; xbacklight -set 20;
753 * would flash to 90% and then slowly down to the desired level (20).
755 * The solution is simple; test anything other than the first level
758 test_level = current_level == max_level
759 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
762 result = acpi_video_device_lcd_set_level(device, test_level);
766 result = acpi_video_device_lcd_get_level_current(device, &level, true);
770 if (level != test_level) {
771 /* buggy _BQC found, need to find out if it uses index */
772 if (level < br->count) {
773 if (br->flags._BCL_reversed)
774 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
775 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
776 br->flags._BQC_use_index = 1;
779 if (!br->flags._BQC_use_index)
780 device->cap._BQC = device->cap._BCQ = 0;
786 int acpi_video_get_levels(struct acpi_device *device,
787 struct acpi_video_device_brightness **dev_br,
790 union acpi_object *obj = NULL;
791 int i, max_level = 0, count = 0, level_ac_battery = 0;
792 union acpi_object *o;
793 struct acpi_video_device_brightness *br = NULL;
797 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
800 "LCD brightness level\n"));
805 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
810 br = kzalloc(sizeof(*br), GFP_KERNEL);
812 printk(KERN_ERR "can't allocate memory\n");
818 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
819 * in order to account for buggy BIOS which don't export the first two
820 * special levels (see below)
822 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
830 for (i = 0; i < obj->package.count; i++) {
831 o = (union acpi_object *)&obj->package.elements[i];
832 if (o->type != ACPI_TYPE_INTEGER) {
833 printk(KERN_ERR PREFIX "Invalid data\n");
836 value = (u32) o->integer.value;
837 /* Skip duplicate entries */
838 if (count > ACPI_VIDEO_FIRST_LEVEL
839 && br->levels[count - 1] == value)
842 br->levels[count] = value;
844 if (br->levels[count] > max_level)
845 max_level = br->levels[count];
850 * some buggy BIOS don't export the levels
851 * when machine is on AC/Battery in _BCL package.
852 * In this case, the first two elements in _BCL packages
853 * are also supported brightness levels that OS should take care of.
855 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
856 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
858 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
862 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
863 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
864 br->flags._BCL_no_ac_battery_levels = 1;
865 for (i = (count - 1 + level_ac_battery);
866 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
867 br->levels[i] = br->levels[i - level_ac_battery];
868 count += level_ac_battery;
869 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
870 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
872 /* Check if the _BCL package is in a reversed order */
873 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
874 br->flags._BCL_reversed = 1;
875 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
876 count - ACPI_VIDEO_FIRST_LEVEL,
877 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
878 acpi_video_cmp_level, NULL);
879 } else if (max_level != br->levels[count - 1])
881 "Found unordered _BCL package"));
886 *pmax_level = max_level;
895 EXPORT_SYMBOL(acpi_video_get_levels);
899 * device : video output device (LCD, CRT, ..)
902 * Maximum brightness level
904 * Allocate and initialize device->brightness.
908 acpi_video_init_brightness(struct acpi_video_device *device)
910 int i, max_level = 0;
911 unsigned long long level, level_old;
912 struct acpi_video_device_brightness *br = NULL;
913 int result = -EINVAL;
915 result = acpi_video_get_levels(device->dev, &br, &max_level);
918 device->brightness = br;
920 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
921 br->curr = level = max_level;
923 if (!device->cap._BQC)
926 result = acpi_video_device_lcd_get_level_current(device,
929 goto out_free_levels;
931 result = acpi_video_bqc_quirk(device, max_level, level_old);
933 goto out_free_levels;
935 * cap._BQC may get cleared due to _BQC is found to be broken
936 * in acpi_video_bqc_quirk, so check again here.
938 if (!device->cap._BQC)
941 level = acpi_video_bqc_value_to_level(device, level_old);
943 * On some buggy laptops, _BQC returns an uninitialized
944 * value when invoked for the first time, i.e.
945 * level_old is invalid (no matter whether it's a level
946 * or an index). Set the backlight to max_level in this case.
948 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
949 if (level == br->levels[i])
951 if (i == br->count || !level)
955 result = acpi_video_device_lcd_set_level(device, level);
957 goto out_free_levels;
959 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
960 "found %d brightness levels\n",
961 br->count - ACPI_VIDEO_FIRST_LEVEL));
967 device->brightness = NULL;
973 * device : video output device (LCD, CRT, ..)
978 * Find out all required AML methods defined under the output
982 static void acpi_video_device_find_cap(struct acpi_video_device *device)
984 if (acpi_has_method(device->dev->handle, "_ADR"))
985 device->cap._ADR = 1;
986 if (acpi_has_method(device->dev->handle, "_BCL"))
987 device->cap._BCL = 1;
988 if (acpi_has_method(device->dev->handle, "_BCM"))
989 device->cap._BCM = 1;
990 if (acpi_has_method(device->dev->handle, "_BQC")) {
991 device->cap._BQC = 1;
992 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
993 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
994 device->cap._BCQ = 1;
997 if (acpi_has_method(device->dev->handle, "_DDC"))
998 device->cap._DDC = 1;
1003 * device : video output device (VGA)
1008 * Find out all required AML methods defined under the video bus device.
1011 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1013 if (acpi_has_method(video->device->handle, "_DOS"))
1014 video->cap._DOS = 1;
1015 if (acpi_has_method(video->device->handle, "_DOD"))
1016 video->cap._DOD = 1;
1017 if (acpi_has_method(video->device->handle, "_ROM"))
1018 video->cap._ROM = 1;
1019 if (acpi_has_method(video->device->handle, "_GPD"))
1020 video->cap._GPD = 1;
1021 if (acpi_has_method(video->device->handle, "_SPD"))
1022 video->cap._SPD = 1;
1023 if (acpi_has_method(video->device->handle, "_VPO"))
1024 video->cap._VPO = 1;
1028 * Check whether the video bus device has required AML method to
1029 * support the desired features
1032 static int acpi_video_bus_check(struct acpi_video_bus *video)
1034 acpi_status status = -ENOENT;
1035 struct pci_dev *dev;
1040 dev = acpi_get_pci_dev(video->device->handle);
1046 * Since there is no HID, CID and so on for VGA driver, we have
1047 * to check well known required nodes.
1050 /* Does this device support video switching? */
1051 if (video->cap._DOS || video->cap._DOD) {
1052 if (!video->cap._DOS) {
1053 printk(KERN_WARNING FW_BUG
1054 "ACPI(%s) defines _DOD but not _DOS\n",
1055 acpi_device_bid(video->device));
1057 video->flags.multihead = 1;
1061 /* Does this device support retrieving a video ROM? */
1062 if (video->cap._ROM) {
1063 video->flags.rom = 1;
1067 /* Does this device support configuring which video device to POST? */
1068 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1069 video->flags.post = 1;
1077 * --------------------------------------------------------------------------
1079 * --------------------------------------------------------------------------
1082 /* device interface */
1083 static struct acpi_video_device_attrib *
1084 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1086 struct acpi_video_enumerated_device *ids;
1089 for (i = 0; i < video->attached_count; i++) {
1090 ids = &video->attached_array[i];
1091 if ((ids->value.int_val & 0xffff) == device_id)
1092 return &ids->value.attrib;
1099 acpi_video_get_device_type(struct acpi_video_bus *video,
1100 unsigned long device_id)
1102 struct acpi_video_enumerated_device *ids;
1105 for (i = 0; i < video->attached_count; i++) {
1106 ids = &video->attached_array[i];
1107 if ((ids->value.int_val & 0xffff) == device_id)
1108 return ids->value.int_val;
1115 acpi_video_bus_get_one_device(struct acpi_device *device,
1116 struct acpi_video_bus *video)
1118 unsigned long long device_id;
1119 int status, device_type;
1120 struct acpi_video_device *data;
1121 struct acpi_video_device_attrib *attribute;
1124 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1125 /* Some device omits _ADR, we skip them instead of fail */
1126 if (ACPI_FAILURE(status))
1129 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1133 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1134 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1135 device->driver_data = data;
1137 data->device_id = device_id;
1138 data->video = video;
1140 INIT_DELAYED_WORK(&data->switch_brightness_work,
1141 acpi_video_switch_brightness);
1143 attribute = acpi_video_get_device_attr(video, device_id);
1145 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1146 switch (attribute->display_type) {
1147 case ACPI_VIDEO_DISPLAY_CRT:
1148 data->flags.crt = 1;
1150 case ACPI_VIDEO_DISPLAY_TV:
1151 data->flags.tvout = 1;
1153 case ACPI_VIDEO_DISPLAY_DVI:
1154 data->flags.dvi = 1;
1156 case ACPI_VIDEO_DISPLAY_LCD:
1157 data->flags.lcd = 1;
1160 data->flags.unknown = 1;
1163 if (attribute->bios_can_detect)
1164 data->flags.bios = 1;
1166 /* Check for legacy IDs */
1167 device_type = acpi_video_get_device_type(video, device_id);
1168 /* Ignore bits 16 and 18-20 */
1169 switch (device_type & 0xffe2ffff) {
1170 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1171 data->flags.crt = 1;
1173 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1174 data->flags.lcd = 1;
1176 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1177 data->flags.tvout = 1;
1180 data->flags.unknown = 1;
1184 acpi_video_device_bind(video, data);
1185 acpi_video_device_find_cap(data);
1187 mutex_lock(&video->device_list_lock);
1188 list_add_tail(&data->entry, &video->video_device_list);
1189 mutex_unlock(&video->device_list_lock);
1196 * video : video bus device
1201 * Enumerate the video device list of the video bus,
1202 * bind the ids with the corresponding video devices
1203 * under the video bus.
1206 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1208 struct acpi_video_device *dev;
1210 mutex_lock(&video->device_list_lock);
1212 list_for_each_entry(dev, &video->video_device_list, entry)
1213 acpi_video_device_bind(video, dev);
1215 mutex_unlock(&video->device_list_lock);
1220 * video : video bus device
1221 * device : video output device under the video
1227 * Bind the ids with the corresponding video devices
1228 * under the video bus.
1232 acpi_video_device_bind(struct acpi_video_bus *video,
1233 struct acpi_video_device *device)
1235 struct acpi_video_enumerated_device *ids;
1238 for (i = 0; i < video->attached_count; i++) {
1239 ids = &video->attached_array[i];
1240 if (device->device_id == (ids->value.int_val & 0xffff)) {
1241 ids->bind_info = device;
1242 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1247 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1249 struct acpi_video_bus *video = device->video;
1253 * If we have a broken _DOD or we have more than 8 output devices
1254 * under the graphics controller node that we can't proper deal with
1255 * in the operation region code currently, no need to test.
1257 if (!video->attached_count || video->child_count > 8)
1260 for (i = 0; i < video->attached_count; i++) {
1261 if ((video->attached_array[i].value.int_val & 0xfff) ==
1262 (device->device_id & 0xfff))
1271 * video : video bus device
1276 * Call _DOD to enumerate all devices attached to display adapter
1280 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1285 struct acpi_video_enumerated_device *active_list;
1286 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1287 union acpi_object *dod = NULL;
1288 union acpi_object *obj;
1290 if (!video->cap._DOD)
1291 return AE_NOT_EXIST;
1293 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1294 if (!ACPI_SUCCESS(status)) {
1295 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1299 dod = buffer.pointer;
1300 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1301 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1306 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1307 dod->package.count));
1309 active_list = kcalloc(1 + dod->package.count,
1310 sizeof(struct acpi_video_enumerated_device),
1318 for (i = 0; i < dod->package.count; i++) {
1319 obj = &dod->package.elements[i];
1321 if (obj->type != ACPI_TYPE_INTEGER) {
1322 printk(KERN_ERR PREFIX
1323 "Invalid _DOD data in element %d\n", i);
1327 active_list[count].value.int_val = obj->integer.value;
1328 active_list[count].bind_info = NULL;
1329 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1330 (int)obj->integer.value));
1334 kfree(video->attached_array);
1336 video->attached_array = active_list;
1337 video->attached_count = count;
1340 kfree(buffer.pointer);
1345 acpi_video_get_next_level(struct acpi_video_device *device,
1346 u32 level_current, u32 event)
1348 int min, max, min_above, max_below, i, l, delta = 255;
1349 max = max_below = 0;
1350 min = min_above = 255;
1351 /* Find closest level to level_current */
1352 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1353 l = device->brightness->levels[i];
1354 if (abs(l - level_current) < abs(delta)) {
1355 delta = l - level_current;
1360 /* Ajust level_current to closest available level */
1361 level_current += delta;
1362 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1363 l = device->brightness->levels[i];
1368 if (l < min_above && l > level_current)
1370 if (l > max_below && l < level_current)
1375 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1376 return (level_current < max) ? min_above : min;
1377 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1378 return (level_current < max) ? min_above : max;
1379 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1380 return (level_current > min) ? max_below : min;
1381 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1382 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1385 return level_current;
1390 acpi_video_switch_brightness(struct work_struct *work)
1392 struct acpi_video_device *device = container_of(to_delayed_work(work),
1393 struct acpi_video_device, switch_brightness_work);
1394 unsigned long long level_current, level_next;
1395 int event = device->switch_brightness_event;
1396 int result = -EINVAL;
1398 /* no warning message if acpi_backlight=vendor or a quirk is used */
1399 if (!device->backlight)
1402 if (!device->brightness)
1405 result = acpi_video_device_lcd_get_level_current(device,
1411 level_next = acpi_video_get_next_level(device, level_current, event);
1413 result = acpi_video_device_lcd_set_level(device, level_next);
1416 backlight_force_update(device->backlight,
1417 BACKLIGHT_UPDATE_HOTKEY);
1421 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1424 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1427 struct acpi_video_bus *video;
1428 struct acpi_video_device *video_device;
1429 union acpi_object *buffer = NULL;
1433 if (!device || !acpi_driver_data(device))
1436 video = acpi_driver_data(device);
1438 for (i = 0; i < video->attached_count; i++) {
1439 video_device = video->attached_array[i].bind_info;
1445 if (!video_device->cap._DDC)
1450 case ACPI_VIDEO_DISPLAY_CRT:
1451 if (!video_device->flags.crt)
1454 case ACPI_VIDEO_DISPLAY_TV:
1455 if (!video_device->flags.tvout)
1458 case ACPI_VIDEO_DISPLAY_DVI:
1459 if (!video_device->flags.dvi)
1462 case ACPI_VIDEO_DISPLAY_LCD:
1463 if (!video_device->flags.lcd)
1467 } else if (video_device->device_id != device_id) {
1471 status = acpi_video_device_EDID(video_device, &buffer, length);
1473 if (ACPI_FAILURE(status) || !buffer ||
1474 buffer->type != ACPI_TYPE_BUFFER) {
1476 status = acpi_video_device_EDID(video_device, &buffer,
1478 if (ACPI_FAILURE(status) || !buffer ||
1479 buffer->type != ACPI_TYPE_BUFFER) {
1484 *edid = buffer->buffer.pointer;
1490 EXPORT_SYMBOL(acpi_video_get_edid);
1493 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1494 struct acpi_device *device)
1497 struct acpi_device *dev;
1500 * There are systems where video module known to work fine regardless
1501 * of broken _DOD and ignoring returned value here doesn't cause
1504 acpi_video_device_enumerate(video);
1506 list_for_each_entry(dev, &device->children, node) {
1508 status = acpi_video_bus_get_one_device(dev, video);
1510 dev_err(&dev->dev, "Can't attach device\n");
1513 video->child_count++;
1518 /* acpi_video interface */
1521 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1522 * preform any automatic brightness change on receiving a notification.
1524 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1526 return acpi_video_bus_DOS(video, 0,
1527 acpi_osi_is_win8() ? 1 : 0);
1530 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1532 return acpi_video_bus_DOS(video, 0,
1533 acpi_osi_is_win8() ? 0 : 1);
1536 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1538 struct acpi_video_bus *video = acpi_driver_data(device);
1539 struct input_dev *input;
1542 if (!video || !video->input)
1545 input = video->input;
1548 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1549 * most likely via hotkey. */
1550 keycode = KEY_SWITCHVIDEOMODE;
1553 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1555 acpi_video_device_enumerate(video);
1556 acpi_video_device_rebind(video);
1557 keycode = KEY_SWITCHVIDEOMODE;
1560 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1561 keycode = KEY_SWITCHVIDEOMODE;
1563 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1564 keycode = KEY_VIDEO_NEXT;
1566 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1567 keycode = KEY_VIDEO_PREV;
1571 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1572 "Unsupported event [0x%x]\n", event));
1576 if (acpi_notifier_call_chain(device, event, 0))
1577 /* Something vetoed the keypress. */
1580 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1581 input_report_key(input, keycode, 1);
1583 input_report_key(input, keycode, 0);
1590 static void brightness_switch_event(struct acpi_video_device *video_device,
1593 if (!brightness_switch_enabled)
1596 video_device->switch_brightness_event = event;
1597 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1600 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1602 struct acpi_video_device *video_device = data;
1603 struct acpi_device *device = NULL;
1604 struct acpi_video_bus *bus;
1605 struct input_dev *input;
1611 device = video_device->dev;
1612 bus = video_device->video;
1616 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1617 brightness_switch_event(video_device, event);
1618 keycode = KEY_BRIGHTNESS_CYCLE;
1620 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1621 brightness_switch_event(video_device, event);
1622 keycode = KEY_BRIGHTNESSUP;
1624 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1625 brightness_switch_event(video_device, event);
1626 keycode = KEY_BRIGHTNESSDOWN;
1628 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1629 brightness_switch_event(video_device, event);
1630 keycode = KEY_BRIGHTNESS_ZERO;
1632 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1633 brightness_switch_event(video_device, event);
1634 keycode = KEY_DISPLAY_OFF;
1637 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1638 "Unsupported event [0x%x]\n", event));
1642 acpi_notifier_call_chain(device, event, 0);
1644 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1645 input_report_key(input, keycode, 1);
1647 input_report_key(input, keycode, 0);
1654 static int acpi_video_resume(struct notifier_block *nb,
1655 unsigned long val, void *ign)
1657 struct acpi_video_bus *video;
1658 struct acpi_video_device *video_device;
1662 case PM_HIBERNATION_PREPARE:
1663 case PM_SUSPEND_PREPARE:
1664 case PM_RESTORE_PREPARE:
1668 video = container_of(nb, struct acpi_video_bus, pm_nb);
1670 dev_info(&video->device->dev, "Restoring backlight state\n");
1672 for (i = 0; i < video->attached_count; i++) {
1673 video_device = video->attached_array[i].bind_info;
1674 if (video_device && video_device->brightness)
1675 acpi_video_device_lcd_set_level(video_device,
1676 video_device->brightness->curr);
1683 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1684 void **return_value)
1686 struct acpi_device *device = context;
1687 struct acpi_device *sibling;
1690 if (handle == device->handle)
1691 return AE_CTRL_TERMINATE;
1693 result = acpi_bus_get_device(handle, &sibling);
1697 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1698 return AE_ALREADY_EXISTS;
1703 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1705 struct backlight_properties props;
1706 struct pci_dev *pdev;
1707 acpi_handle acpi_parent;
1708 struct device *parent = NULL;
1713 result = acpi_video_init_brightness(device);
1717 if (disable_backlight_sysfs_if > 0)
1720 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1725 acpi_get_parent(device->dev->handle, &acpi_parent);
1727 pdev = acpi_get_pci_dev(acpi_parent);
1729 parent = &pdev->dev;
1733 memset(&props, 0, sizeof(struct backlight_properties));
1734 props.type = BACKLIGHT_FIRMWARE;
1735 props.max_brightness =
1736 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1737 device->backlight = backlight_device_register(name,
1740 &acpi_backlight_ops,
1743 if (IS_ERR(device->backlight)) {
1744 device->backlight = NULL;
1749 * Save current brightness level in case we have to restore it
1750 * before acpi_video_device_lcd_set_level() is called next time.
1752 device->backlight->props.brightness =
1753 acpi_video_get_brightness(device->backlight);
1755 device->cooling_dev = thermal_cooling_device_register("LCD",
1756 device->dev, &video_cooling_ops);
1757 if (IS_ERR(device->cooling_dev)) {
1759 * Set cooling_dev to NULL so we don't crash trying to free it.
1760 * Also, why the hell we are returning early and not attempt to
1761 * register video output if cooling device registration failed?
1764 device->cooling_dev = NULL;
1768 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1769 device->cooling_dev->id);
1770 result = sysfs_create_link(&device->dev->dev.kobj,
1771 &device->cooling_dev->device.kobj,
1774 printk(KERN_ERR PREFIX "Create sysfs link\n");
1775 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1776 &device->dev->dev.kobj, "device");
1778 printk(KERN_ERR PREFIX "Create sysfs link\n");
1781 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1783 struct acpi_video_device *dev;
1784 union acpi_object *levels;
1786 mutex_lock(&video->device_list_lock);
1787 list_for_each_entry(dev, &video->video_device_list, entry) {
1788 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1791 mutex_unlock(&video->device_list_lock);
1794 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1797 * Do not create backlight device for video output
1798 * device that is not in the enumerated list.
1800 if (!acpi_video_device_in_dod(dev)) {
1801 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1806 return dev->flags.lcd;
1810 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1812 struct acpi_video_device *dev;
1814 if (video->backlight_registered)
1817 acpi_video_run_bcl_for_osi(video);
1819 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1822 mutex_lock(&video->device_list_lock);
1823 list_for_each_entry(dev, &video->video_device_list, entry) {
1824 if (acpi_video_should_register_backlight(dev))
1825 acpi_video_dev_register_backlight(dev);
1827 mutex_unlock(&video->device_list_lock);
1829 video->backlight_registered = true;
1831 video->pm_nb.notifier_call = acpi_video_resume;
1832 video->pm_nb.priority = 0;
1833 return register_pm_notifier(&video->pm_nb);
1836 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1838 if (device->backlight) {
1839 backlight_device_unregister(device->backlight);
1840 device->backlight = NULL;
1842 if (device->brightness) {
1843 kfree(device->brightness->levels);
1844 kfree(device->brightness);
1845 device->brightness = NULL;
1847 if (device->cooling_dev) {
1848 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1849 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1850 thermal_cooling_device_unregister(device->cooling_dev);
1851 device->cooling_dev = NULL;
1855 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1857 struct acpi_video_device *dev;
1860 if (!video->backlight_registered)
1863 error = unregister_pm_notifier(&video->pm_nb);
1865 mutex_lock(&video->device_list_lock);
1866 list_for_each_entry(dev, &video->video_device_list, entry)
1867 acpi_video_dev_unregister_backlight(dev);
1868 mutex_unlock(&video->device_list_lock);
1870 video->backlight_registered = false;
1875 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1878 struct acpi_device *adev = device->dev;
1880 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1881 acpi_video_device_notify, device);
1882 if (ACPI_FAILURE(status))
1883 dev_err(&adev->dev, "Error installing notify handler\n");
1885 device->flags.notify = 1;
1888 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1890 struct input_dev *input;
1891 struct acpi_video_device *dev;
1894 video->input = input = input_allocate_device();
1900 error = acpi_video_bus_start_devices(video);
1902 goto err_free_input;
1904 snprintf(video->phys, sizeof(video->phys),
1905 "%s/video/input0", acpi_device_hid(video->device));
1907 input->name = acpi_device_name(video->device);
1908 input->phys = video->phys;
1909 input->id.bustype = BUS_HOST;
1910 input->id.product = 0x06;
1911 input->dev.parent = &video->device->dev;
1912 input->evbit[0] = BIT(EV_KEY);
1913 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1914 set_bit(KEY_VIDEO_NEXT, input->keybit);
1915 set_bit(KEY_VIDEO_PREV, input->keybit);
1916 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1917 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1918 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1919 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1920 set_bit(KEY_DISPLAY_OFF, input->keybit);
1922 error = input_register_device(input);
1926 mutex_lock(&video->device_list_lock);
1927 list_for_each_entry(dev, &video->video_device_list, entry)
1928 acpi_video_dev_add_notify_handler(dev);
1929 mutex_unlock(&video->device_list_lock);
1934 acpi_video_bus_stop_devices(video);
1936 input_free_device(input);
1937 video->input = NULL;
1942 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1944 if (dev->flags.notify) {
1945 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1946 acpi_video_device_notify);
1947 dev->flags.notify = 0;
1951 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1953 struct acpi_video_device *dev;
1955 mutex_lock(&video->device_list_lock);
1956 list_for_each_entry(dev, &video->video_device_list, entry)
1957 acpi_video_dev_remove_notify_handler(dev);
1958 mutex_unlock(&video->device_list_lock);
1960 acpi_video_bus_stop_devices(video);
1961 input_unregister_device(video->input);
1962 video->input = NULL;
1965 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1967 struct acpi_video_device *dev, *next;
1969 mutex_lock(&video->device_list_lock);
1970 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1971 list_del(&dev->entry);
1974 mutex_unlock(&video->device_list_lock);
1979 static int instance;
1981 static int acpi_video_bus_add(struct acpi_device *device)
1983 struct acpi_video_bus *video;
1987 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1988 device->parent->handle, 1,
1989 acpi_video_bus_match, NULL,
1991 if (status == AE_ALREADY_EXISTS) {
1992 printk(KERN_WARNING FW_BUG
1993 "Duplicate ACPI video bus devices for the"
1994 " same VGA controller, please try module "
1995 "parameter \"video.allow_duplicates=1\""
1996 "if the current driver doesn't work.\n");
1997 if (!allow_duplicates)
2001 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2005 /* a hack to fix the duplicate name "VID" problem on T61 */
2006 if (!strcmp(device->pnp.bus_id, "VID")) {
2008 device->pnp.bus_id[3] = '0' + instance;
2011 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2012 if (!strcmp(device->pnp.bus_id, "VGA")) {
2014 device->pnp.bus_id[3] = '0' + instance;
2018 video->device = device;
2019 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2020 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2021 device->driver_data = video;
2023 acpi_video_bus_find_cap(video);
2024 error = acpi_video_bus_check(video);
2026 goto err_free_video;
2028 mutex_init(&video->device_list_lock);
2029 INIT_LIST_HEAD(&video->video_device_list);
2031 error = acpi_video_bus_get_devices(video, device);
2035 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2036 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2037 video->flags.multihead ? "yes" : "no",
2038 video->flags.rom ? "yes" : "no",
2039 video->flags.post ? "yes" : "no");
2040 mutex_lock(&video_list_lock);
2041 list_add_tail(&video->entry, &video_bus_head);
2042 mutex_unlock(&video_list_lock);
2044 acpi_video_bus_register_backlight(video);
2045 acpi_video_bus_add_notify_handler(video);
2050 acpi_video_bus_put_devices(video);
2051 kfree(video->attached_array);
2054 device->driver_data = NULL;
2059 static int acpi_video_bus_remove(struct acpi_device *device)
2061 struct acpi_video_bus *video = NULL;
2064 if (!device || !acpi_driver_data(device))
2067 video = acpi_driver_data(device);
2069 acpi_video_bus_remove_notify_handler(video);
2070 acpi_video_bus_unregister_backlight(video);
2071 acpi_video_bus_put_devices(video);
2073 mutex_lock(&video_list_lock);
2074 list_del(&video->entry);
2075 mutex_unlock(&video_list_lock);
2077 kfree(video->attached_array);
2083 static int __init is_i740(struct pci_dev *dev)
2085 if (dev->device == 0x00D1)
2087 if (dev->device == 0x7000)
2092 static int __init intel_opregion_present(void)
2095 struct pci_dev *dev = NULL;
2098 for_each_pci_dev(dev) {
2099 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2101 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2103 /* We don't want to poke around undefined i740 registers */
2106 pci_read_config_dword(dev, 0xfc, &address);
2114 /* Check if the chassis-type indicates there is no builtin LCD panel */
2115 static bool dmi_is_desktop(void)
2117 const char *chassis_type;
2120 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2124 if (kstrtoul(chassis_type, 10, &type) != 0)
2128 case 0x03: /* Desktop */
2129 case 0x04: /* Low Profile Desktop */
2130 case 0x05: /* Pizza Box */
2131 case 0x06: /* Mini Tower */
2132 case 0x07: /* Tower */
2133 case 0x10: /* Lunch Box */
2134 case 0x11: /* Main Server Chassis */
2141 int acpi_video_register(void)
2145 mutex_lock(®ister_count_mutex);
2146 if (register_count) {
2148 * if the function of acpi_video_register is already called,
2149 * don't register the acpi_vide_bus again and return no error.
2155 * We're seeing a lot of bogus backlight interfaces on newer machines
2156 * without a LCD such as desktops, servers and HDMI sticks. Checking
2157 * the lcd flag fixes this, so enable this on any machines which are
2158 * win8 ready (where we also prefer the native backlight driver, so
2159 * normally the acpi_video code should not register there anyways).
2161 if (only_lcd == -1) {
2162 if (dmi_is_desktop() && acpi_osi_is_win8())
2168 dmi_check_system(video_dmi_table);
2170 ret = acpi_bus_register_driver(&acpi_video_bus);
2175 * When the acpi_video_bus is loaded successfully, increase
2176 * the counter reference.
2181 mutex_unlock(®ister_count_mutex);
2184 EXPORT_SYMBOL(acpi_video_register);
2186 void acpi_video_unregister(void)
2188 mutex_lock(®ister_count_mutex);
2189 if (register_count) {
2190 acpi_bus_unregister_driver(&acpi_video_bus);
2193 mutex_unlock(®ister_count_mutex);
2195 EXPORT_SYMBOL(acpi_video_unregister);
2197 void acpi_video_unregister_backlight(void)
2199 struct acpi_video_bus *video;
2201 mutex_lock(®ister_count_mutex);
2202 if (register_count) {
2203 mutex_lock(&video_list_lock);
2204 list_for_each_entry(video, &video_bus_head, entry)
2205 acpi_video_bus_unregister_backlight(video);
2206 mutex_unlock(&video_list_lock);
2208 mutex_unlock(®ister_count_mutex);
2211 bool acpi_video_handles_brightness_key_presses(void)
2213 bool have_video_busses;
2215 mutex_lock(&video_list_lock);
2216 have_video_busses = !list_empty(&video_bus_head);
2217 mutex_unlock(&video_list_lock);
2219 return have_video_busses &&
2220 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2222 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2225 * This is kind of nasty. Hardware using Intel chipsets may require
2226 * the video opregion code to be run first in order to initialise
2227 * state before any ACPI video calls are made. To handle this we defer
2228 * registration of the video class until the opregion code has run.
2231 static int __init acpi_video_init(void)
2234 * Let the module load even if ACPI is disabled (e.g. due to
2235 * a broken BIOS) so that i915.ko can still be loaded on such
2236 * old systems without an AcpiOpRegion.
2238 * acpi_video_register() will report -ENODEV later as well due
2239 * to acpi_disabled when i915.ko tries to register itself afterwards.
2244 if (intel_opregion_present())
2247 return acpi_video_register();
2250 static void __exit acpi_video_exit(void)
2252 acpi_video_detect_exit();
2253 acpi_video_unregister();
2258 module_init(acpi_video_init);
2259 module_exit(acpi_video_exit);