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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/input.h>
30 #include <linux/backlight.h>
31 #include <linux/thermal.h>
32 #include <linux/sort.h>
33 #include <linux/pci.h>
34 #include <linux/pci_ids.h>
35 #include <linux/slab.h>
36 #include <linux/dmi.h>
37 #include <linux/suspend.h>
38 #include <linux/acpi.h>
39 #include <acpi/video.h>
40 #include <linux/uaccess.h>
42 #define PREFIX "ACPI: "
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
47 #define MAX_NAME_LEN 20
49 #define _COMPONENT ACPI_VIDEO_COMPONENT
50 ACPI_MODULE_NAME("video");
52 MODULE_AUTHOR("Bruno Ducrot");
53 MODULE_DESCRIPTION("ACPI Video Driver");
54 MODULE_LICENSE("GPL");
56 static bool brightness_switch_enabled = 1;
57 module_param(brightness_switch_enabled, bool, 0644);
60 * By default, we don't allow duplicate ACPI video bus devices
61 * under the same VGA controller
63 static bool allow_duplicates;
64 module_param(allow_duplicates, bool, 0644);
66 static int disable_backlight_sysfs_if = -1;
67 module_param(disable_backlight_sysfs_if, int, 0444);
69 #define REPORT_OUTPUT_KEY_EVENTS 0x01
70 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
71 static int report_key_events = -1;
72 module_param(report_key_events, int, 0644);
73 MODULE_PARM_DESC(report_key_events,
74 "0: none, 1: output changes, 2: brightness changes, 3: all");
76 static int hw_changes_brightness = -1;
77 module_param(hw_changes_brightness, int, 0644);
78 MODULE_PARM_DESC(hw_changes_brightness,
79 "Set this to 1 on buggy hw which changes the brightness itself when "
80 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
83 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
84 * assumed even if not actually set.
86 static bool device_id_scheme = false;
87 module_param(device_id_scheme, bool, 0444);
89 static int only_lcd = -1;
90 module_param(only_lcd, int, 0444);
92 static int register_count;
93 static DEFINE_MUTEX(register_count_mutex);
94 static DEFINE_MUTEX(video_list_lock);
95 static LIST_HEAD(video_bus_head);
96 static int acpi_video_bus_add(struct acpi_device *device);
97 static int acpi_video_bus_remove(struct acpi_device *device);
98 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
99 void acpi_video_detect_exit(void);
102 * Indices in the _BCL method response: the first two items are special,
103 * the rest are all supported levels.
105 * See page 575 of the ACPI spec 3.0
107 enum acpi_video_level_idx {
108 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
109 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
110 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
113 static const struct acpi_device_id video_device_ids[] = {
117 MODULE_DEVICE_TABLE(acpi, video_device_ids);
119 static struct acpi_driver acpi_video_bus = {
121 .class = ACPI_VIDEO_CLASS,
122 .ids = video_device_ids,
124 .add = acpi_video_bus_add,
125 .remove = acpi_video_bus_remove,
126 .notify = acpi_video_bus_notify,
130 struct acpi_video_bus_flags {
131 u8 multihead:1; /* can switch video heads */
132 u8 rom:1; /* can retrieve a video rom */
133 u8 post:1; /* can configure the head to */
137 struct acpi_video_bus_cap {
138 u8 _DOS:1; /* Enable/Disable output switching */
139 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
140 u8 _ROM:1; /* Get ROM Data */
141 u8 _GPD:1; /* Get POST Device */
142 u8 _SPD:1; /* Set POST Device */
143 u8 _VPO:1; /* Video POST Options */
147 struct acpi_video_device_attrib {
148 u32 display_index:4; /* A zero-based instance of the Display */
149 u32 display_port_attachment:4; /* This field differentiates the display type */
150 u32 display_type:4; /* Describe the specific type in use */
151 u32 vendor_specific:4; /* Chipset Vendor Specific */
152 u32 bios_can_detect:1; /* BIOS can detect the device */
153 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
155 u32 pipe_id:3; /* For VGA multiple-head devices. */
156 u32 reserved:10; /* Must be 0 */
159 * The device ID might not actually follow the scheme described by this
160 * struct acpi_video_device_attrib. If it does, then this bit
161 * device_id_scheme is set; otherwise, other fields should be ignored.
163 * (but also see the global flag device_id_scheme)
165 u32 device_id_scheme:1;
168 struct acpi_video_enumerated_device {
171 struct acpi_video_device_attrib attrib;
173 struct acpi_video_device *bind_info;
176 struct acpi_video_bus {
177 struct acpi_device *device;
178 bool backlight_registered;
180 struct acpi_video_enumerated_device *attached_array;
183 struct acpi_video_bus_cap cap;
184 struct acpi_video_bus_flags flags;
185 struct list_head video_device_list;
186 struct mutex device_list_lock; /* protects video_device_list */
187 struct list_head entry;
188 struct input_dev *input;
189 char phys[32]; /* for input device */
190 struct notifier_block pm_nb;
193 struct acpi_video_device_flags {
204 struct acpi_video_device_cap {
205 u8 _ADR:1; /* Return the unique ID */
206 u8 _BCL:1; /* Query list of brightness control levels supported */
207 u8 _BCM:1; /* Set the brightness level */
208 u8 _BQC:1; /* Get current brightness level */
209 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
210 u8 _DDC:1; /* Return the EDID for this device */
213 struct acpi_video_device {
214 unsigned long device_id;
215 struct acpi_video_device_flags flags;
216 struct acpi_video_device_cap cap;
217 struct list_head entry;
218 struct delayed_work switch_brightness_work;
219 int switch_brightness_event;
220 struct acpi_video_bus *video;
221 struct acpi_device *dev;
222 struct acpi_video_device_brightness *brightness;
223 struct backlight_device *backlight;
224 struct thermal_cooling_device *cooling_dev;
227 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
228 static void acpi_video_device_rebind(struct acpi_video_bus *video);
229 static void acpi_video_device_bind(struct acpi_video_bus *video,
230 struct acpi_video_device *device);
231 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
232 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
234 static int acpi_video_device_lcd_get_level_current(
235 struct acpi_video_device *device,
236 unsigned long long *level, bool raw);
237 static int acpi_video_get_next_level(struct acpi_video_device *device,
238 u32 level_current, u32 event);
239 static void acpi_video_switch_brightness(struct work_struct *work);
241 /* backlight device sysfs support */
242 static int acpi_video_get_brightness(struct backlight_device *bd)
244 unsigned long long cur_level;
246 struct acpi_video_device *vd = bl_get_data(bd);
248 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
250 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
251 if (vd->brightness->levels[i] == cur_level)
252 return i - ACPI_VIDEO_FIRST_LEVEL;
257 static int acpi_video_set_brightness(struct backlight_device *bd)
259 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
260 struct acpi_video_device *vd = bl_get_data(bd);
262 cancel_delayed_work(&vd->switch_brightness_work);
263 return acpi_video_device_lcd_set_level(vd,
264 vd->brightness->levels[request_level]);
267 static const struct backlight_ops acpi_backlight_ops = {
268 .get_brightness = acpi_video_get_brightness,
269 .update_status = acpi_video_set_brightness,
272 /* thermal cooling device callbacks */
273 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
274 unsigned long *state)
276 struct acpi_device *device = cooling_dev->devdata;
277 struct acpi_video_device *video = acpi_driver_data(device);
279 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
283 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
284 unsigned long *state)
286 struct acpi_device *device = cooling_dev->devdata;
287 struct acpi_video_device *video = acpi_driver_data(device);
288 unsigned long long level;
291 if (acpi_video_device_lcd_get_level_current(video, &level, false))
293 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
295 if (level == video->brightness->levels[offset]) {
296 *state = video->brightness->count - offset - 1;
304 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
306 struct acpi_device *device = cooling_dev->devdata;
307 struct acpi_video_device *video = acpi_driver_data(device);
310 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
313 state = video->brightness->count - state;
314 level = video->brightness->levels[state - 1];
315 return acpi_video_device_lcd_set_level(video, level);
318 static const struct thermal_cooling_device_ops video_cooling_ops = {
319 .get_max_state = video_get_max_state,
320 .get_cur_state = video_get_cur_state,
321 .set_cur_state = video_set_cur_state,
325 * --------------------------------------------------------------------------
327 * --------------------------------------------------------------------------
331 acpi_video_device_lcd_query_levels(acpi_handle handle,
332 union acpi_object **levels)
335 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
336 union acpi_object *obj;
341 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
342 if (!ACPI_SUCCESS(status))
344 obj = (union acpi_object *)buffer.pointer;
345 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
346 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
356 kfree(buffer.pointer);
362 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
367 status = acpi_execute_simple_method(device->dev->handle,
369 if (ACPI_FAILURE(status)) {
370 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
374 device->brightness->curr = level;
375 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
377 if (level == device->brightness->levels[state]) {
378 if (device->backlight)
379 device->backlight->props.brightness =
380 state - ACPI_VIDEO_FIRST_LEVEL;
384 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
389 * For some buggy _BQC methods, we need to add a constant value to
390 * the _BQC return value to get the actual current brightness level
393 static int bqc_offset_aml_bug_workaround;
394 static int video_set_bqc_offset(const struct dmi_system_id *d)
396 bqc_offset_aml_bug_workaround = 9;
400 static int video_disable_backlight_sysfs_if(
401 const struct dmi_system_id *d)
403 if (disable_backlight_sysfs_if == -1)
404 disable_backlight_sysfs_if = 1;
408 static int video_set_device_id_scheme(const struct dmi_system_id *d)
410 device_id_scheme = true;
414 static int video_enable_only_lcd(const struct dmi_system_id *d)
420 static int video_set_report_key_events(const struct dmi_system_id *id)
422 if (report_key_events == -1)
423 report_key_events = (uintptr_t)id->driver_data;
427 static int video_hw_changes_brightness(
428 const struct dmi_system_id *d)
430 if (hw_changes_brightness == -1)
431 hw_changes_brightness = 1;
435 static const struct dmi_system_id video_dmi_table[] = {
437 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
440 .callback = video_set_bqc_offset,
441 .ident = "Acer Aspire 5720",
443 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
444 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
448 .callback = video_set_bqc_offset,
449 .ident = "Acer Aspire 5710Z",
451 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
456 .callback = video_set_bqc_offset,
457 .ident = "eMachines E510",
459 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
460 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
464 .callback = video_set_bqc_offset,
465 .ident = "Acer Aspire 5315",
467 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
468 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
472 .callback = video_set_bqc_offset,
473 .ident = "Acer Aspire 7720",
475 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
476 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
481 * Some machines have a broken acpi-video interface for brightness
482 * control, but still need an acpi_video_device_lcd_set_level() call
483 * on resume to turn the backlight power on. We Enable backlight
484 * control on these systems, but do not register a backlight sysfs
485 * as brightness control does not work.
488 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
489 .callback = video_disable_backlight_sysfs_if,
490 .ident = "Toshiba Portege R700",
492 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
493 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
497 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
498 .callback = video_disable_backlight_sysfs_if,
499 .ident = "Toshiba Portege R830",
501 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
502 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
507 .callback = video_disable_backlight_sysfs_if,
508 .ident = "Toshiba Satellite R830",
510 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
515 .callback = video_disable_backlight_sysfs_if,
516 .ident = "Toshiba Satellite Z830",
518 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"),
523 .callback = video_disable_backlight_sysfs_if,
524 .ident = "Toshiba Portege Z830",
526 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"),
531 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
532 * but the IDs actually follow the Device ID Scheme.
535 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
536 .callback = video_set_device_id_scheme,
537 .ident = "ESPRIMO Mobile M9410",
539 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
540 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
544 * Some machines have multiple video output devices, but only the one
545 * that is the type of LCD can do the backlight control so we should not
546 * register backlight interface for other video output devices.
549 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
550 .callback = video_enable_only_lcd,
551 .ident = "ESPRIMO Mobile M9410",
553 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
554 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
558 * Some machines report wrong key events on the acpi-bus, suppress
559 * key event reporting on these. Note this is only intended to work
560 * around events which are plain wrong. In some cases we get double
561 * events, in this case acpi-video is considered the canonical source
562 * and the events from the other source should be filtered. E.g.
563 * by calling acpi_video_handles_brightness_key_presses() from the
564 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
567 .callback = video_set_report_key_events,
568 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
569 .ident = "Dell Vostro V131",
571 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
572 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
576 .callback = video_set_report_key_events,
577 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
578 .ident = "Dell Vostro 3350",
580 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
585 * Some machines change the brightness themselves when a brightness
586 * hotkey gets pressed, despite us telling them not to. In this case
587 * acpi_video_device_notify() should only call backlight_force_update(
588 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
591 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
592 .callback = video_hw_changes_brightness,
593 .ident = "Packard Bell EasyNote MZ35",
595 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
602 static unsigned long long
603 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
604 unsigned long long bqc_value)
606 unsigned long long level;
608 if (device->brightness->flags._BQC_use_index) {
610 * _BQC returns an index that doesn't account for the first 2
611 * items with special meaning (see enum acpi_video_level_idx),
612 * so we need to compensate for that by offsetting ourselves
614 if (device->brightness->flags._BCL_reversed)
615 bqc_value = device->brightness->count -
616 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
618 level = device->brightness->levels[bqc_value +
619 ACPI_VIDEO_FIRST_LEVEL];
624 level += bqc_offset_aml_bug_workaround;
630 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
631 unsigned long long *level, bool raw)
633 acpi_status status = AE_OK;
636 if (device->cap._BQC || device->cap._BCQ) {
637 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
639 status = acpi_evaluate_integer(device->dev->handle, buf,
641 if (ACPI_SUCCESS(status)) {
644 * Caller has indicated he wants the raw
645 * value returned by _BQC, so don't furtherly
646 * mess with the value.
651 *level = acpi_video_bqc_value_to_level(device, *level);
653 for (i = ACPI_VIDEO_FIRST_LEVEL;
654 i < device->brightness->count; i++)
655 if (device->brightness->levels[i] == *level) {
656 device->brightness->curr = *level;
660 * BQC returned an invalid level.
663 ACPI_WARNING((AE_INFO,
664 "%s returned an invalid level",
666 device->cap._BQC = device->cap._BCQ = 0;
670 * should we return an error or ignore this failure?
671 * dev->brightness->curr is a cached value which stores
672 * the correct current backlight level in most cases.
673 * ACPI video backlight still works w/ buggy _BQC.
674 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
676 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
677 device->cap._BQC = device->cap._BCQ = 0;
681 *level = device->brightness->curr;
686 acpi_video_device_EDID(struct acpi_video_device *device,
687 union acpi_object **edid, ssize_t length)
690 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
691 union acpi_object *obj;
692 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
693 struct acpi_object_list args = { 1, &arg0 };
701 arg0.integer.value = 1;
702 else if (length == 256)
703 arg0.integer.value = 2;
707 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
708 if (ACPI_FAILURE(status))
711 obj = buffer.pointer;
713 if (obj && obj->type == ACPI_TYPE_BUFFER)
716 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
728 * video : video bus device pointer
730 * 0. The system BIOS should NOT automatically switch(toggle)
731 * the active display output.
732 * 1. The system BIOS should automatically switch (toggle) the
733 * active display output. No switch event.
734 * 2. The _DGS value should be locked.
735 * 3. The system BIOS should not automatically switch (toggle) the
736 * active display output, but instead generate the display switch
739 * 0. The system BIOS should automatically control the brightness level
740 * of the LCD when the power changes from AC to DC
741 * 1. The system BIOS should NOT automatically control the brightness
742 * level of the LCD when the power changes from AC to DC.
748 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
752 if (!video->cap._DOS)
755 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
757 video->dos_setting = (lcd_flag << 2) | bios_flag;
758 status = acpi_execute_simple_method(video->device->handle, "_DOS",
759 (lcd_flag << 2) | bios_flag);
760 if (ACPI_FAILURE(status))
767 * Simple comparison function used to sort backlight levels.
771 acpi_video_cmp_level(const void *a, const void *b)
773 return *(int *)a - *(int *)b;
777 * Decides if _BQC/_BCQ for this system is usable
779 * We do this by changing the level first and then read out the current
780 * brightness level, if the value does not match, find out if it is using
781 * index. If not, clear the _BQC/_BCQ capability.
783 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
784 int max_level, int current_level)
786 struct acpi_video_device_brightness *br = device->brightness;
788 unsigned long long level;
791 /* don't mess with existing known broken systems */
792 if (bqc_offset_aml_bug_workaround)
796 * Some systems always report current brightness level as maximum
797 * through _BQC, we need to test another value for them. However,
798 * there is a subtlety:
800 * If the _BCL package ordering is descending, the first level
801 * (br->levels[2]) is likely to be 0, and if the number of levels
802 * matches the number of steps, we might confuse a returned level to
807 * current_level = max_level = 100
809 * returned level = 100
811 * In this case 100 means the level, not the index, and _BCM failed.
812 * Still, if the _BCL package ordering is descending, the index of
813 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
815 * This causes all _BQC calls to return bogus values causing weird
816 * behavior from the user's perspective. For example:
818 * xbacklight -set 10; xbacklight -set 20;
820 * would flash to 90% and then slowly down to the desired level (20).
822 * The solution is simple; test anything other than the first level
825 test_level = current_level == max_level
826 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
829 result = acpi_video_device_lcd_set_level(device, test_level);
833 result = acpi_video_device_lcd_get_level_current(device, &level, true);
837 if (level != test_level) {
838 /* buggy _BQC found, need to find out if it uses index */
839 if (level < br->count) {
840 if (br->flags._BCL_reversed)
841 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
842 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
843 br->flags._BQC_use_index = 1;
846 if (!br->flags._BQC_use_index)
847 device->cap._BQC = device->cap._BCQ = 0;
853 int acpi_video_get_levels(struct acpi_device *device,
854 struct acpi_video_device_brightness **dev_br,
857 union acpi_object *obj = NULL;
858 int i, max_level = 0, count = 0, level_ac_battery = 0;
859 union acpi_object *o;
860 struct acpi_video_device_brightness *br = NULL;
864 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
866 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
867 "LCD brightness level\n"));
872 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
877 br = kzalloc(sizeof(*br), GFP_KERNEL);
879 printk(KERN_ERR "can't allocate memory\n");
885 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
886 * in order to account for buggy BIOS which don't export the first two
887 * special levels (see below)
889 br->levels = kmalloc((obj->package.count + ACPI_VIDEO_FIRST_LEVEL) *
890 sizeof(*br->levels), GFP_KERNEL);
896 for (i = 0; i < obj->package.count; i++) {
897 o = (union acpi_object *)&obj->package.elements[i];
898 if (o->type != ACPI_TYPE_INTEGER) {
899 printk(KERN_ERR PREFIX "Invalid data\n");
902 value = (u32) o->integer.value;
903 /* Skip duplicate entries */
904 if (count > ACPI_VIDEO_FIRST_LEVEL
905 && br->levels[count - 1] == value)
908 br->levels[count] = value;
910 if (br->levels[count] > max_level)
911 max_level = br->levels[count];
916 * some buggy BIOS don't export the levels
917 * when machine is on AC/Battery in _BCL package.
918 * In this case, the first two elements in _BCL packages
919 * are also supported brightness levels that OS should take care of.
921 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
922 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
924 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
928 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
929 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
930 br->flags._BCL_no_ac_battery_levels = 1;
931 for (i = (count - 1 + level_ac_battery);
932 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
933 br->levels[i] = br->levels[i - level_ac_battery];
934 count += level_ac_battery;
935 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
936 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
938 /* Check if the _BCL package is in a reversed order */
939 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
940 br->flags._BCL_reversed = 1;
941 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
942 count - ACPI_VIDEO_FIRST_LEVEL,
943 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
944 acpi_video_cmp_level, NULL);
945 } else if (max_level != br->levels[count - 1])
947 "Found unordered _BCL package"));
952 *pmax_level = max_level;
961 EXPORT_SYMBOL(acpi_video_get_levels);
965 * device : video output device (LCD, CRT, ..)
968 * Maximum brightness level
970 * Allocate and initialize device->brightness.
974 acpi_video_init_brightness(struct acpi_video_device *device)
976 int i, max_level = 0;
977 unsigned long long level, level_old;
978 struct acpi_video_device_brightness *br = NULL;
979 int result = -EINVAL;
981 result = acpi_video_get_levels(device->dev, &br, &max_level);
984 device->brightness = br;
986 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
987 br->curr = level = max_level;
989 if (!device->cap._BQC)
992 result = acpi_video_device_lcd_get_level_current(device,
995 goto out_free_levels;
997 result = acpi_video_bqc_quirk(device, max_level, level_old);
999 goto out_free_levels;
1001 * cap._BQC may get cleared due to _BQC is found to be broken
1002 * in acpi_video_bqc_quirk, so check again here.
1004 if (!device->cap._BQC)
1007 level = acpi_video_bqc_value_to_level(device, level_old);
1009 * On some buggy laptops, _BQC returns an uninitialized
1010 * value when invoked for the first time, i.e.
1011 * level_old is invalid (no matter whether it's a level
1012 * or an index). Set the backlight to max_level in this case.
1014 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
1015 if (level == br->levels[i])
1017 if (i == br->count || !level)
1021 result = acpi_video_device_lcd_set_level(device, level);
1023 goto out_free_levels;
1025 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1026 "found %d brightness levels\n",
1027 br->count - ACPI_VIDEO_FIRST_LEVEL));
1033 device->brightness = NULL;
1039 * device : video output device (LCD, CRT, ..)
1044 * Find out all required AML methods defined under the output
1048 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1050 if (acpi_has_method(device->dev->handle, "_ADR"))
1051 device->cap._ADR = 1;
1052 if (acpi_has_method(device->dev->handle, "_BCL"))
1053 device->cap._BCL = 1;
1054 if (acpi_has_method(device->dev->handle, "_BCM"))
1055 device->cap._BCM = 1;
1056 if (acpi_has_method(device->dev->handle, "_BQC")) {
1057 device->cap._BQC = 1;
1058 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1059 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1060 device->cap._BCQ = 1;
1063 if (acpi_has_method(device->dev->handle, "_DDC"))
1064 device->cap._DDC = 1;
1069 * device : video output device (VGA)
1074 * Find out all required AML methods defined under the video bus device.
1077 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1079 if (acpi_has_method(video->device->handle, "_DOS"))
1080 video->cap._DOS = 1;
1081 if (acpi_has_method(video->device->handle, "_DOD"))
1082 video->cap._DOD = 1;
1083 if (acpi_has_method(video->device->handle, "_ROM"))
1084 video->cap._ROM = 1;
1085 if (acpi_has_method(video->device->handle, "_GPD"))
1086 video->cap._GPD = 1;
1087 if (acpi_has_method(video->device->handle, "_SPD"))
1088 video->cap._SPD = 1;
1089 if (acpi_has_method(video->device->handle, "_VPO"))
1090 video->cap._VPO = 1;
1094 * Check whether the video bus device has required AML method to
1095 * support the desired features
1098 static int acpi_video_bus_check(struct acpi_video_bus *video)
1100 acpi_status status = -ENOENT;
1101 struct pci_dev *dev;
1106 dev = acpi_get_pci_dev(video->device->handle);
1112 * Since there is no HID, CID and so on for VGA driver, we have
1113 * to check well known required nodes.
1116 /* Does this device support video switching? */
1117 if (video->cap._DOS || video->cap._DOD) {
1118 if (!video->cap._DOS) {
1119 printk(KERN_WARNING FW_BUG
1120 "ACPI(%s) defines _DOD but not _DOS\n",
1121 acpi_device_bid(video->device));
1123 video->flags.multihead = 1;
1127 /* Does this device support retrieving a video ROM? */
1128 if (video->cap._ROM) {
1129 video->flags.rom = 1;
1133 /* Does this device support configuring which video device to POST? */
1134 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1135 video->flags.post = 1;
1143 * --------------------------------------------------------------------------
1145 * --------------------------------------------------------------------------
1148 /* device interface */
1149 static struct acpi_video_device_attrib *
1150 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1152 struct acpi_video_enumerated_device *ids;
1155 for (i = 0; i < video->attached_count; i++) {
1156 ids = &video->attached_array[i];
1157 if ((ids->value.int_val & 0xffff) == device_id)
1158 return &ids->value.attrib;
1165 acpi_video_get_device_type(struct acpi_video_bus *video,
1166 unsigned long device_id)
1168 struct acpi_video_enumerated_device *ids;
1171 for (i = 0; i < video->attached_count; i++) {
1172 ids = &video->attached_array[i];
1173 if ((ids->value.int_val & 0xffff) == device_id)
1174 return ids->value.int_val;
1181 acpi_video_bus_get_one_device(struct acpi_device *device,
1182 struct acpi_video_bus *video)
1184 unsigned long long device_id;
1185 int status, device_type;
1186 struct acpi_video_device *data;
1187 struct acpi_video_device_attrib *attribute;
1190 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1191 /* Some device omits _ADR, we skip them instead of fail */
1192 if (ACPI_FAILURE(status))
1195 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1199 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1200 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1201 device->driver_data = data;
1203 data->device_id = device_id;
1204 data->video = video;
1206 INIT_DELAYED_WORK(&data->switch_brightness_work,
1207 acpi_video_switch_brightness);
1209 attribute = acpi_video_get_device_attr(video, device_id);
1211 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1212 switch (attribute->display_type) {
1213 case ACPI_VIDEO_DISPLAY_CRT:
1214 data->flags.crt = 1;
1216 case ACPI_VIDEO_DISPLAY_TV:
1217 data->flags.tvout = 1;
1219 case ACPI_VIDEO_DISPLAY_DVI:
1220 data->flags.dvi = 1;
1222 case ACPI_VIDEO_DISPLAY_LCD:
1223 data->flags.lcd = 1;
1226 data->flags.unknown = 1;
1229 if (attribute->bios_can_detect)
1230 data->flags.bios = 1;
1232 /* Check for legacy IDs */
1233 device_type = acpi_video_get_device_type(video, device_id);
1234 /* Ignore bits 16 and 18-20 */
1235 switch (device_type & 0xffe2ffff) {
1236 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1237 data->flags.crt = 1;
1239 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1240 data->flags.lcd = 1;
1242 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1243 data->flags.tvout = 1;
1246 data->flags.unknown = 1;
1250 acpi_video_device_bind(video, data);
1251 acpi_video_device_find_cap(data);
1253 mutex_lock(&video->device_list_lock);
1254 list_add_tail(&data->entry, &video->video_device_list);
1255 mutex_unlock(&video->device_list_lock);
1262 * video : video bus device
1267 * Enumerate the video device list of the video bus,
1268 * bind the ids with the corresponding video devices
1269 * under the video bus.
1272 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1274 struct acpi_video_device *dev;
1276 mutex_lock(&video->device_list_lock);
1278 list_for_each_entry(dev, &video->video_device_list, entry)
1279 acpi_video_device_bind(video, dev);
1281 mutex_unlock(&video->device_list_lock);
1286 * video : video bus device
1287 * device : video output device under the video
1293 * Bind the ids with the corresponding video devices
1294 * under the video bus.
1298 acpi_video_device_bind(struct acpi_video_bus *video,
1299 struct acpi_video_device *device)
1301 struct acpi_video_enumerated_device *ids;
1304 for (i = 0; i < video->attached_count; i++) {
1305 ids = &video->attached_array[i];
1306 if (device->device_id == (ids->value.int_val & 0xffff)) {
1307 ids->bind_info = device;
1308 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1313 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1315 struct acpi_video_bus *video = device->video;
1319 * If we have a broken _DOD or we have more than 8 output devices
1320 * under the graphics controller node that we can't proper deal with
1321 * in the operation region code currently, no need to test.
1323 if (!video->attached_count || video->child_count > 8)
1326 for (i = 0; i < video->attached_count; i++) {
1327 if ((video->attached_array[i].value.int_val & 0xfff) ==
1328 (device->device_id & 0xfff))
1337 * video : video bus device
1342 * Call _DOD to enumerate all devices attached to display adapter
1346 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1351 struct acpi_video_enumerated_device *active_list;
1352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1353 union acpi_object *dod = NULL;
1354 union acpi_object *obj;
1356 if (!video->cap._DOD)
1357 return AE_NOT_EXIST;
1359 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1360 if (!ACPI_SUCCESS(status)) {
1361 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1365 dod = buffer.pointer;
1366 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1367 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1372 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1373 dod->package.count));
1375 active_list = kcalloc(1 + dod->package.count,
1376 sizeof(struct acpi_video_enumerated_device),
1384 for (i = 0; i < dod->package.count; i++) {
1385 obj = &dod->package.elements[i];
1387 if (obj->type != ACPI_TYPE_INTEGER) {
1388 printk(KERN_ERR PREFIX
1389 "Invalid _DOD data in element %d\n", i);
1393 active_list[count].value.int_val = obj->integer.value;
1394 active_list[count].bind_info = NULL;
1395 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1396 (int)obj->integer.value));
1400 kfree(video->attached_array);
1402 video->attached_array = active_list;
1403 video->attached_count = count;
1406 kfree(buffer.pointer);
1411 acpi_video_get_next_level(struct acpi_video_device *device,
1412 u32 level_current, u32 event)
1414 int min, max, min_above, max_below, i, l, delta = 255;
1415 max = max_below = 0;
1416 min = min_above = 255;
1417 /* Find closest level to level_current */
1418 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1419 l = device->brightness->levels[i];
1420 if (abs(l - level_current) < abs(delta)) {
1421 delta = l - level_current;
1426 /* Ajust level_current to closest available level */
1427 level_current += delta;
1428 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1429 l = device->brightness->levels[i];
1434 if (l < min_above && l > level_current)
1436 if (l > max_below && l < level_current)
1441 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1442 return (level_current < max) ? min_above : min;
1443 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1444 return (level_current < max) ? min_above : max;
1445 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1446 return (level_current > min) ? max_below : min;
1447 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1448 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1451 return level_current;
1456 acpi_video_switch_brightness(struct work_struct *work)
1458 struct acpi_video_device *device = container_of(to_delayed_work(work),
1459 struct acpi_video_device, switch_brightness_work);
1460 unsigned long long level_current, level_next;
1461 int event = device->switch_brightness_event;
1462 int result = -EINVAL;
1464 /* no warning message if acpi_backlight=vendor or a quirk is used */
1465 if (!device->backlight)
1468 if (!device->brightness)
1471 result = acpi_video_device_lcd_get_level_current(device,
1477 level_next = acpi_video_get_next_level(device, level_current, event);
1479 result = acpi_video_device_lcd_set_level(device, level_next);
1482 backlight_force_update(device->backlight,
1483 BACKLIGHT_UPDATE_HOTKEY);
1487 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1490 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1493 struct acpi_video_bus *video;
1494 struct acpi_video_device *video_device;
1495 union acpi_object *buffer = NULL;
1499 if (!device || !acpi_driver_data(device))
1502 video = acpi_driver_data(device);
1504 for (i = 0; i < video->attached_count; i++) {
1505 video_device = video->attached_array[i].bind_info;
1511 if (!video_device->cap._DDC)
1516 case ACPI_VIDEO_DISPLAY_CRT:
1517 if (!video_device->flags.crt)
1520 case ACPI_VIDEO_DISPLAY_TV:
1521 if (!video_device->flags.tvout)
1524 case ACPI_VIDEO_DISPLAY_DVI:
1525 if (!video_device->flags.dvi)
1528 case ACPI_VIDEO_DISPLAY_LCD:
1529 if (!video_device->flags.lcd)
1533 } else if (video_device->device_id != device_id) {
1537 status = acpi_video_device_EDID(video_device, &buffer, length);
1539 if (ACPI_FAILURE(status) || !buffer ||
1540 buffer->type != ACPI_TYPE_BUFFER) {
1542 status = acpi_video_device_EDID(video_device, &buffer,
1544 if (ACPI_FAILURE(status) || !buffer ||
1545 buffer->type != ACPI_TYPE_BUFFER) {
1550 *edid = buffer->buffer.pointer;
1556 EXPORT_SYMBOL(acpi_video_get_edid);
1559 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1560 struct acpi_device *device)
1563 struct acpi_device *dev;
1566 * There are systems where video module known to work fine regardless
1567 * of broken _DOD and ignoring returned value here doesn't cause
1570 acpi_video_device_enumerate(video);
1572 list_for_each_entry(dev, &device->children, node) {
1574 status = acpi_video_bus_get_one_device(dev, video);
1576 dev_err(&dev->dev, "Can't attach device\n");
1579 video->child_count++;
1584 /* acpi_video interface */
1587 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1588 * preform any automatic brightness change on receiving a notification.
1590 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1592 return acpi_video_bus_DOS(video, 0,
1593 acpi_osi_is_win8() ? 1 : 0);
1596 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1598 return acpi_video_bus_DOS(video, 0,
1599 acpi_osi_is_win8() ? 0 : 1);
1602 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1604 struct acpi_video_bus *video = acpi_driver_data(device);
1605 struct input_dev *input;
1608 if (!video || !video->input)
1611 input = video->input;
1614 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1615 * most likely via hotkey. */
1616 keycode = KEY_SWITCHVIDEOMODE;
1619 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1621 acpi_video_device_enumerate(video);
1622 acpi_video_device_rebind(video);
1623 keycode = KEY_SWITCHVIDEOMODE;
1626 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1627 keycode = KEY_SWITCHVIDEOMODE;
1629 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1630 keycode = KEY_VIDEO_NEXT;
1632 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1633 keycode = KEY_VIDEO_PREV;
1637 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1638 "Unsupported event [0x%x]\n", event));
1642 if (acpi_notifier_call_chain(device, event, 0))
1643 /* Something vetoed the keypress. */
1646 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1647 input_report_key(input, keycode, 1);
1649 input_report_key(input, keycode, 0);
1656 static void brightness_switch_event(struct acpi_video_device *video_device,
1659 if (!brightness_switch_enabled)
1662 video_device->switch_brightness_event = event;
1663 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1666 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1668 struct acpi_video_device *video_device = data;
1669 struct acpi_device *device = NULL;
1670 struct acpi_video_bus *bus;
1671 struct input_dev *input;
1677 device = video_device->dev;
1678 bus = video_device->video;
1681 if (hw_changes_brightness > 0) {
1682 if (video_device->backlight)
1683 backlight_force_update(video_device->backlight,
1684 BACKLIGHT_UPDATE_HOTKEY);
1685 acpi_notifier_call_chain(device, event, 0);
1690 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1691 brightness_switch_event(video_device, event);
1692 keycode = KEY_BRIGHTNESS_CYCLE;
1694 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1695 brightness_switch_event(video_device, event);
1696 keycode = KEY_BRIGHTNESSUP;
1698 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1699 brightness_switch_event(video_device, event);
1700 keycode = KEY_BRIGHTNESSDOWN;
1702 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1703 brightness_switch_event(video_device, event);
1704 keycode = KEY_BRIGHTNESS_ZERO;
1706 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1707 brightness_switch_event(video_device, event);
1708 keycode = KEY_DISPLAY_OFF;
1711 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1712 "Unsupported event [0x%x]\n", event));
1716 acpi_notifier_call_chain(device, event, 0);
1718 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1719 input_report_key(input, keycode, 1);
1721 input_report_key(input, keycode, 0);
1728 static int acpi_video_resume(struct notifier_block *nb,
1729 unsigned long val, void *ign)
1731 struct acpi_video_bus *video;
1732 struct acpi_video_device *video_device;
1736 case PM_HIBERNATION_PREPARE:
1737 case PM_SUSPEND_PREPARE:
1738 case PM_RESTORE_PREPARE:
1742 video = container_of(nb, struct acpi_video_bus, pm_nb);
1744 dev_info(&video->device->dev, "Restoring backlight state\n");
1746 for (i = 0; i < video->attached_count; i++) {
1747 video_device = video->attached_array[i].bind_info;
1748 if (video_device && video_device->brightness)
1749 acpi_video_device_lcd_set_level(video_device,
1750 video_device->brightness->curr);
1757 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1758 void **return_value)
1760 struct acpi_device *device = context;
1761 struct acpi_device *sibling;
1764 if (handle == device->handle)
1765 return AE_CTRL_TERMINATE;
1767 result = acpi_bus_get_device(handle, &sibling);
1771 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1772 return AE_ALREADY_EXISTS;
1777 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1779 struct backlight_properties props;
1780 struct pci_dev *pdev;
1781 acpi_handle acpi_parent;
1782 struct device *parent = NULL;
1787 result = acpi_video_init_brightness(device);
1791 if (disable_backlight_sysfs_if > 0)
1794 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1799 acpi_get_parent(device->dev->handle, &acpi_parent);
1801 pdev = acpi_get_pci_dev(acpi_parent);
1803 parent = &pdev->dev;
1807 memset(&props, 0, sizeof(struct backlight_properties));
1808 props.type = BACKLIGHT_FIRMWARE;
1809 props.max_brightness =
1810 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1811 device->backlight = backlight_device_register(name,
1814 &acpi_backlight_ops,
1817 if (IS_ERR(device->backlight)) {
1818 device->backlight = NULL;
1823 * Save current brightness level in case we have to restore it
1824 * before acpi_video_device_lcd_set_level() is called next time.
1826 device->backlight->props.brightness =
1827 acpi_video_get_brightness(device->backlight);
1829 device->cooling_dev = thermal_cooling_device_register("LCD",
1830 device->dev, &video_cooling_ops);
1831 if (IS_ERR(device->cooling_dev)) {
1833 * Set cooling_dev to NULL so we don't crash trying to free it.
1834 * Also, why the hell we are returning early and not attempt to
1835 * register video output if cooling device registration failed?
1838 device->cooling_dev = NULL;
1842 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1843 device->cooling_dev->id);
1844 result = sysfs_create_link(&device->dev->dev.kobj,
1845 &device->cooling_dev->device.kobj,
1848 printk(KERN_ERR PREFIX "Create sysfs link\n");
1849 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1850 &device->dev->dev.kobj, "device");
1852 printk(KERN_ERR PREFIX "Create sysfs link\n");
1855 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1857 struct acpi_video_device *dev;
1858 union acpi_object *levels;
1860 mutex_lock(&video->device_list_lock);
1861 list_for_each_entry(dev, &video->video_device_list, entry) {
1862 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1865 mutex_unlock(&video->device_list_lock);
1868 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1871 * Do not create backlight device for video output
1872 * device that is not in the enumerated list.
1874 if (!acpi_video_device_in_dod(dev)) {
1875 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1880 return dev->flags.lcd;
1884 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1886 struct acpi_video_device *dev;
1888 if (video->backlight_registered)
1891 acpi_video_run_bcl_for_osi(video);
1893 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1896 mutex_lock(&video->device_list_lock);
1897 list_for_each_entry(dev, &video->video_device_list, entry) {
1898 if (acpi_video_should_register_backlight(dev))
1899 acpi_video_dev_register_backlight(dev);
1901 mutex_unlock(&video->device_list_lock);
1903 video->backlight_registered = true;
1905 video->pm_nb.notifier_call = acpi_video_resume;
1906 video->pm_nb.priority = 0;
1907 return register_pm_notifier(&video->pm_nb);
1910 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1912 if (device->backlight) {
1913 backlight_device_unregister(device->backlight);
1914 device->backlight = NULL;
1916 if (device->brightness) {
1917 kfree(device->brightness->levels);
1918 kfree(device->brightness);
1919 device->brightness = NULL;
1921 if (device->cooling_dev) {
1922 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1923 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1924 thermal_cooling_device_unregister(device->cooling_dev);
1925 device->cooling_dev = NULL;
1929 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1931 struct acpi_video_device *dev;
1934 if (!video->backlight_registered)
1937 error = unregister_pm_notifier(&video->pm_nb);
1939 mutex_lock(&video->device_list_lock);
1940 list_for_each_entry(dev, &video->video_device_list, entry)
1941 acpi_video_dev_unregister_backlight(dev);
1942 mutex_unlock(&video->device_list_lock);
1944 video->backlight_registered = false;
1949 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1952 struct acpi_device *adev = device->dev;
1954 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1955 acpi_video_device_notify, device);
1956 if (ACPI_FAILURE(status))
1957 dev_err(&adev->dev, "Error installing notify handler\n");
1959 device->flags.notify = 1;
1962 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1964 struct input_dev *input;
1965 struct acpi_video_device *dev;
1968 video->input = input = input_allocate_device();
1974 error = acpi_video_bus_start_devices(video);
1976 goto err_free_input;
1978 snprintf(video->phys, sizeof(video->phys),
1979 "%s/video/input0", acpi_device_hid(video->device));
1981 input->name = acpi_device_name(video->device);
1982 input->phys = video->phys;
1983 input->id.bustype = BUS_HOST;
1984 input->id.product = 0x06;
1985 input->dev.parent = &video->device->dev;
1986 input->evbit[0] = BIT(EV_KEY);
1987 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1988 set_bit(KEY_VIDEO_NEXT, input->keybit);
1989 set_bit(KEY_VIDEO_PREV, input->keybit);
1990 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1991 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1992 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1993 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1994 set_bit(KEY_DISPLAY_OFF, input->keybit);
1996 error = input_register_device(input);
2000 mutex_lock(&video->device_list_lock);
2001 list_for_each_entry(dev, &video->video_device_list, entry)
2002 acpi_video_dev_add_notify_handler(dev);
2003 mutex_unlock(&video->device_list_lock);
2008 acpi_video_bus_stop_devices(video);
2010 input_free_device(input);
2011 video->input = NULL;
2016 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2018 if (dev->flags.notify) {
2019 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2020 acpi_video_device_notify);
2021 dev->flags.notify = 0;
2025 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2027 struct acpi_video_device *dev;
2029 mutex_lock(&video->device_list_lock);
2030 list_for_each_entry(dev, &video->video_device_list, entry)
2031 acpi_video_dev_remove_notify_handler(dev);
2032 mutex_unlock(&video->device_list_lock);
2034 acpi_video_bus_stop_devices(video);
2035 input_unregister_device(video->input);
2036 video->input = NULL;
2039 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2041 struct acpi_video_device *dev, *next;
2043 mutex_lock(&video->device_list_lock);
2044 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2045 list_del(&dev->entry);
2048 mutex_unlock(&video->device_list_lock);
2053 static int instance;
2055 static int acpi_video_bus_add(struct acpi_device *device)
2057 struct acpi_video_bus *video;
2061 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2062 device->parent->handle, 1,
2063 acpi_video_bus_match, NULL,
2065 if (status == AE_ALREADY_EXISTS) {
2066 printk(KERN_WARNING FW_BUG
2067 "Duplicate ACPI video bus devices for the"
2068 " same VGA controller, please try module "
2069 "parameter \"video.allow_duplicates=1\""
2070 "if the current driver doesn't work.\n");
2071 if (!allow_duplicates)
2075 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2079 /* a hack to fix the duplicate name "VID" problem on T61 */
2080 if (!strcmp(device->pnp.bus_id, "VID")) {
2082 device->pnp.bus_id[3] = '0' + instance;
2085 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2086 if (!strcmp(device->pnp.bus_id, "VGA")) {
2088 device->pnp.bus_id[3] = '0' + instance;
2092 video->device = device;
2093 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2094 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2095 device->driver_data = video;
2097 acpi_video_bus_find_cap(video);
2098 error = acpi_video_bus_check(video);
2100 goto err_free_video;
2102 mutex_init(&video->device_list_lock);
2103 INIT_LIST_HEAD(&video->video_device_list);
2105 error = acpi_video_bus_get_devices(video, device);
2109 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2110 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2111 video->flags.multihead ? "yes" : "no",
2112 video->flags.rom ? "yes" : "no",
2113 video->flags.post ? "yes" : "no");
2114 mutex_lock(&video_list_lock);
2115 list_add_tail(&video->entry, &video_bus_head);
2116 mutex_unlock(&video_list_lock);
2118 acpi_video_bus_register_backlight(video);
2119 acpi_video_bus_add_notify_handler(video);
2124 acpi_video_bus_put_devices(video);
2125 kfree(video->attached_array);
2128 device->driver_data = NULL;
2133 static int acpi_video_bus_remove(struct acpi_device *device)
2135 struct acpi_video_bus *video = NULL;
2138 if (!device || !acpi_driver_data(device))
2141 video = acpi_driver_data(device);
2143 acpi_video_bus_remove_notify_handler(video);
2144 acpi_video_bus_unregister_backlight(video);
2145 acpi_video_bus_put_devices(video);
2147 mutex_lock(&video_list_lock);
2148 list_del(&video->entry);
2149 mutex_unlock(&video_list_lock);
2151 kfree(video->attached_array);
2157 static int __init is_i740(struct pci_dev *dev)
2159 if (dev->device == 0x00D1)
2161 if (dev->device == 0x7000)
2166 static int __init intel_opregion_present(void)
2169 struct pci_dev *dev = NULL;
2172 for_each_pci_dev(dev) {
2173 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2175 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2177 /* We don't want to poke around undefined i740 registers */
2180 pci_read_config_dword(dev, 0xfc, &address);
2188 /* Check if the chassis-type indicates there is no builtin LCD panel */
2189 static bool dmi_is_desktop(void)
2191 const char *chassis_type;
2194 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2198 if (kstrtoul(chassis_type, 10, &type) != 0)
2202 case 0x03: /* Desktop */
2203 case 0x04: /* Low Profile Desktop */
2204 case 0x05: /* Pizza Box */
2205 case 0x06: /* Mini Tower */
2206 case 0x07: /* Tower */
2207 case 0x10: /* Lunch Box */
2208 case 0x11: /* Main Server Chassis */
2215 int acpi_video_register(void)
2219 mutex_lock(®ister_count_mutex);
2220 if (register_count) {
2222 * if the function of acpi_video_register is already called,
2223 * don't register the acpi_vide_bus again and return no error.
2229 * We're seeing a lot of bogus backlight interfaces on newer machines
2230 * without a LCD such as desktops, servers and HDMI sticks. Checking
2231 * the lcd flag fixes this, so enable this on any machines which are
2232 * win8 ready (where we also prefer the native backlight driver, so
2233 * normally the acpi_video code should not register there anyways).
2235 if (only_lcd == -1) {
2236 if (dmi_is_desktop() && acpi_osi_is_win8())
2242 dmi_check_system(video_dmi_table);
2244 ret = acpi_bus_register_driver(&acpi_video_bus);
2249 * When the acpi_video_bus is loaded successfully, increase
2250 * the counter reference.
2255 mutex_unlock(®ister_count_mutex);
2258 EXPORT_SYMBOL(acpi_video_register);
2260 void acpi_video_unregister(void)
2262 mutex_lock(®ister_count_mutex);
2263 if (register_count) {
2264 acpi_bus_unregister_driver(&acpi_video_bus);
2267 mutex_unlock(®ister_count_mutex);
2269 EXPORT_SYMBOL(acpi_video_unregister);
2271 void acpi_video_unregister_backlight(void)
2273 struct acpi_video_bus *video;
2275 mutex_lock(®ister_count_mutex);
2276 if (register_count) {
2277 mutex_lock(&video_list_lock);
2278 list_for_each_entry(video, &video_bus_head, entry)
2279 acpi_video_bus_unregister_backlight(video);
2280 mutex_unlock(&video_list_lock);
2282 mutex_unlock(®ister_count_mutex);
2285 bool acpi_video_handles_brightness_key_presses(void)
2287 bool have_video_busses;
2289 mutex_lock(&video_list_lock);
2290 have_video_busses = !list_empty(&video_bus_head);
2291 mutex_unlock(&video_list_lock);
2293 return have_video_busses &&
2294 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2296 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2299 * This is kind of nasty. Hardware using Intel chipsets may require
2300 * the video opregion code to be run first in order to initialise
2301 * state before any ACPI video calls are made. To handle this we defer
2302 * registration of the video class until the opregion code has run.
2305 static int __init acpi_video_init(void)
2308 * Let the module load even if ACPI is disabled (e.g. due to
2309 * a broken BIOS) so that i915.ko can still be loaded on such
2310 * old systems without an AcpiOpRegion.
2312 * acpi_video_register() will report -ENODEV later as well due
2313 * to acpi_disabled when i915.ko tries to register itself afterwards.
2318 if (intel_opregion_present())
2321 return acpi_video_register();
2324 static void __exit acpi_video_exit(void)
2326 acpi_video_detect_exit();
2327 acpi_video_unregister();
2332 module_init(acpi_video_init);
2333 module_exit(acpi_video_exit);