2 * video.c - ACPI Video Driver
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = true;
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
96 static const struct acpi_device_id video_device_ids[] = {
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
102 static struct acpi_driver acpi_video_bus = {
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
143 struct acpi_video_enumerated_device {
146 struct acpi_video_device_attrib attrib;
148 struct acpi_video_device *bind_info;
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 bool backlight_registered;
154 bool backlight_notifier_registered;
156 struct acpi_video_enumerated_device *attached_array;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 struct notifier_block backlight_nb;
169 struct acpi_video_device_flags {
180 struct acpi_video_device_cap {
181 u8 _ADR:1; /* Return the unique ID */
182 u8 _BCL:1; /* Query list of brightness control levels supported */
183 u8 _BCM:1; /* Set the brightness level */
184 u8 _BQC:1; /* Get current brightness level */
185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
186 u8 _DDC:1; /* Return the EDID for this device */
189 struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
195 struct acpi_video_device_brightness {
199 struct acpi_video_brightness_flags flags;
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct delayed_work switch_brightness_work;
208 int switch_brightness_event;
209 struct acpi_video_bus *video;
210 struct acpi_device *dev;
211 struct acpi_video_device_brightness *brightness;
212 struct backlight_device *backlight;
213 struct thermal_cooling_device *cooling_dev;
216 static const char device_decode[][30] = {
217 "motherboard VGA device",
223 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
224 static void acpi_video_device_rebind(struct acpi_video_bus *video);
225 static void acpi_video_device_bind(struct acpi_video_bus *video,
226 struct acpi_video_device *device);
227 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
228 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
230 static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device *device,
232 unsigned long long *level, bool raw);
233 static int acpi_video_get_next_level(struct acpi_video_device *device,
234 u32 level_current, u32 event);
235 static void acpi_video_switch_brightness(struct work_struct *work);
237 static bool acpi_video_use_native_backlight(void)
239 if (use_native_backlight_param != -1)
240 return use_native_backlight_param;
242 return use_native_backlight_dmi;
245 bool acpi_video_verify_backlight_support(void)
247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
248 backlight_device_registered(BACKLIGHT_RAW))
250 return acpi_video_backlight_support();
252 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
254 /* backlight device sysfs support */
255 static int acpi_video_get_brightness(struct backlight_device *bd)
257 unsigned long long cur_level;
259 struct acpi_video_device *vd = bl_get_data(bd);
261 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
263 for (i = 2; i < vd->brightness->count; i++) {
264 if (vd->brightness->levels[i] == cur_level)
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
274 static int acpi_video_set_brightness(struct backlight_device *bd)
276 int request_level = bd->props.brightness + 2;
277 struct acpi_video_device *vd = bl_get_data(bd);
279 cancel_delayed_work(&vd->switch_brightness_work);
280 return acpi_video_device_lcd_set_level(vd,
281 vd->brightness->levels[request_level]);
284 static const struct backlight_ops acpi_backlight_ops = {
285 .get_brightness = acpi_video_get_brightness,
286 .update_status = acpi_video_set_brightness,
289 /* thermal cooling device callbacks */
290 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
296 *state = video->brightness->count - 3;
300 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
305 unsigned long long level;
308 if (acpi_video_device_lcd_get_level_current(video, &level, false))
310 for (offset = 2; offset < video->brightness->count; offset++)
311 if (level == video->brightness->levels[offset]) {
312 *state = video->brightness->count - offset - 1;
320 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
322 struct acpi_device *device = cooling_dev->devdata;
323 struct acpi_video_device *video = acpi_driver_data(device);
326 if (state >= video->brightness->count - 2)
329 state = video->brightness->count - state;
330 level = video->brightness->levels[state - 1];
331 return acpi_video_device_lcd_set_level(video, level);
334 static const struct thermal_cooling_device_ops video_cooling_ops = {
335 .get_max_state = video_get_max_state,
336 .get_cur_state = video_get_cur_state,
337 .set_cur_state = video_set_cur_state,
341 * --------------------------------------------------------------------------
343 * --------------------------------------------------------------------------
347 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
348 union acpi_object **levels)
351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
352 union acpi_object *obj;
357 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
358 if (!ACPI_SUCCESS(status))
360 obj = (union acpi_object *)buffer.pointer;
361 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
362 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
372 kfree(buffer.pointer);
378 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
383 status = acpi_execute_simple_method(device->dev->handle,
385 if (ACPI_FAILURE(status)) {
386 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
390 device->brightness->curr = level;
391 for (state = 2; state < device->brightness->count; state++)
392 if (level == device->brightness->levels[state]) {
393 if (device->backlight)
394 device->backlight->props.brightness = state - 2;
398 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
407 static int bqc_offset_aml_bug_workaround;
408 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
410 bqc_offset_aml_bug_workaround = 9;
414 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
416 use_native_backlight_dmi = true;
420 static int __init video_disable_native_backlight(const struct dmi_system_id *d)
422 use_native_backlight_dmi = false;
426 static struct dmi_system_id video_dmi_table[] __initdata = {
428 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5720",
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
439 .callback = video_set_bqc_offset,
440 .ident = "Acer Aspire 5710Z",
442 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
447 .callback = video_set_bqc_offset,
448 .ident = "eMachines E510",
450 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
451 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
455 .callback = video_set_bqc_offset,
456 .ident = "Acer Aspire 5315",
458 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
463 .callback = video_set_bqc_offset,
464 .ident = "Acer Aspire 7720",
466 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
467 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
471 .callback = video_set_use_native_backlight,
472 .ident = "ThinkPad X230",
474 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
475 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
479 .callback = video_set_use_native_backlight,
480 .ident = "ThinkPad T430 and T430s",
482 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
483 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
487 .callback = video_set_use_native_backlight,
488 .ident = "ThinkPad T430",
490 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
495 .callback = video_set_use_native_backlight,
496 .ident = "ThinkPad T431s",
498 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
503 .callback = video_set_use_native_backlight,
504 .ident = "ThinkPad Edge E530",
506 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
511 .callback = video_set_use_native_backlight,
512 .ident = "ThinkPad Edge E530",
514 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
519 .callback = video_set_use_native_backlight,
520 .ident = "ThinkPad Edge E530",
522 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
523 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
527 .callback = video_set_use_native_backlight,
528 .ident = "ThinkPad W530",
530 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
531 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
535 .callback = video_set_use_native_backlight,
536 .ident = "ThinkPad X1 Carbon",
538 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
539 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
543 .callback = video_set_use_native_backlight,
544 .ident = "Lenovo Yoga 13",
546 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
547 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
551 .callback = video_set_use_native_backlight,
552 .ident = "Lenovo Yoga 2 11",
554 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
555 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
559 .callback = video_set_use_native_backlight,
560 .ident = "Thinkpad Helix",
562 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
563 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
567 .callback = video_set_use_native_backlight,
568 .ident = "Dell Inspiron 7520",
570 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
571 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
575 .callback = video_set_use_native_backlight,
576 .ident = "Acer Aspire 5733Z",
578 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
579 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
583 .callback = video_set_use_native_backlight,
584 .ident = "Acer Aspire 5742G",
586 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
591 .callback = video_set_use_native_backlight,
592 .ident = "Acer Aspire V5-171",
594 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
599 .callback = video_set_use_native_backlight,
600 .ident = "Acer Aspire V5-431",
602 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
603 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
607 .callback = video_set_use_native_backlight,
608 .ident = "Acer Aspire V5-471G",
610 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
611 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
615 .callback = video_set_use_native_backlight,
616 .ident = "Acer TravelMate B113",
618 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
619 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
623 .callback = video_set_use_native_backlight,
624 .ident = "Acer Aspire V5-572G",
626 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
627 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
631 .callback = video_set_use_native_backlight,
632 .ident = "Acer Aspire V5-573G",
634 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
635 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
639 .callback = video_set_use_native_backlight,
640 .ident = "ASUS Zenbook Prime UX31A",
642 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
643 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
647 .callback = video_set_use_native_backlight,
648 .ident = "HP ProBook 4340s",
650 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
651 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
655 .callback = video_set_use_native_backlight,
656 .ident = "HP ProBook 4540s",
658 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
659 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
663 .callback = video_set_use_native_backlight,
664 .ident = "HP ProBook 2013 models",
666 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
667 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
668 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
672 .callback = video_set_use_native_backlight,
673 .ident = "HP EliteBook 2013 models",
675 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
676 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
677 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
681 .callback = video_set_use_native_backlight,
682 .ident = "HP EliteBook 2014 models",
684 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
685 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
686 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
690 .callback = video_set_use_native_backlight,
691 .ident = "HP ZBook 14",
693 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
694 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
698 .callback = video_set_use_native_backlight,
699 .ident = "HP ZBook 15",
701 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
702 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
706 .callback = video_set_use_native_backlight,
707 .ident = "HP ZBook 17",
709 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
710 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
714 .callback = video_set_use_native_backlight,
715 .ident = "HP EliteBook 8470p",
717 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
718 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
722 .callback = video_set_use_native_backlight,
723 .ident = "HP EliteBook 8780w",
725 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
726 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
731 * These models have a working acpi_video backlight control, and using
732 * native backlight causes a regression where backlight does not work
733 * when userspace is not handling brightness key events. Disable
734 * native_backlight on these to fix this:
735 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
738 .callback = video_disable_native_backlight,
739 .ident = "ThinkPad T420",
741 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
742 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
746 .callback = video_disable_native_backlight,
747 .ident = "ThinkPad T520",
749 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
750 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
754 .callback = video_disable_native_backlight,
755 .ident = "ThinkPad X201s",
757 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
758 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
762 /* The native backlight controls do not work on some older machines */
764 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
765 .callback = video_disable_native_backlight,
766 .ident = "HP ENVY 15 Notebook",
768 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
769 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
775 static unsigned long long
776 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
777 unsigned long long bqc_value)
779 unsigned long long level;
781 if (device->brightness->flags._BQC_use_index) {
783 * _BQC returns an index that doesn't account for
784 * the first 2 items with special meaning, so we need
785 * to compensate for that by offsetting ourselves
787 if (device->brightness->flags._BCL_reversed)
788 bqc_value = device->brightness->count - 3 - bqc_value;
790 level = device->brightness->levels[bqc_value + 2];
795 level += bqc_offset_aml_bug_workaround;
801 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
802 unsigned long long *level, bool raw)
804 acpi_status status = AE_OK;
807 if (device->cap._BQC || device->cap._BCQ) {
808 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
810 status = acpi_evaluate_integer(device->dev->handle, buf,
812 if (ACPI_SUCCESS(status)) {
815 * Caller has indicated he wants the raw
816 * value returned by _BQC, so don't furtherly
817 * mess with the value.
822 *level = acpi_video_bqc_value_to_level(device, *level);
824 for (i = 2; i < device->brightness->count; i++)
825 if (device->brightness->levels[i] == *level) {
826 device->brightness->curr = *level;
830 * BQC returned an invalid level.
833 ACPI_WARNING((AE_INFO,
834 "%s returned an invalid level",
836 device->cap._BQC = device->cap._BCQ = 0;
840 * should we return an error or ignore this failure?
841 * dev->brightness->curr is a cached value which stores
842 * the correct current backlight level in most cases.
843 * ACPI video backlight still works w/ buggy _BQC.
844 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
846 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
847 device->cap._BQC = device->cap._BCQ = 0;
851 *level = device->brightness->curr;
856 acpi_video_device_EDID(struct acpi_video_device *device,
857 union acpi_object **edid, ssize_t length)
860 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
861 union acpi_object *obj;
862 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
863 struct acpi_object_list args = { 1, &arg0 };
871 arg0.integer.value = 1;
872 else if (length == 256)
873 arg0.integer.value = 2;
877 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
878 if (ACPI_FAILURE(status))
881 obj = buffer.pointer;
883 if (obj && obj->type == ACPI_TYPE_BUFFER)
886 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
898 * video : video bus device pointer
900 * 0. The system BIOS should NOT automatically switch(toggle)
901 * the active display output.
902 * 1. The system BIOS should automatically switch (toggle) the
903 * active display output. No switch event.
904 * 2. The _DGS value should be locked.
905 * 3. The system BIOS should not automatically switch (toggle) the
906 * active display output, but instead generate the display switch
909 * 0. The system BIOS should automatically control the brightness level
910 * of the LCD when the power changes from AC to DC
911 * 1. The system BIOS should NOT automatically control the brightness
912 * level of the LCD when the power changes from AC to DC.
918 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
922 if (!video->cap._DOS)
925 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
927 video->dos_setting = (lcd_flag << 2) | bios_flag;
928 status = acpi_execute_simple_method(video->device->handle, "_DOS",
929 (lcd_flag << 2) | bios_flag);
930 if (ACPI_FAILURE(status))
937 * Simple comparison function used to sort backlight levels.
941 acpi_video_cmp_level(const void *a, const void *b)
943 return *(int *)a - *(int *)b;
947 * Decides if _BQC/_BCQ for this system is usable
949 * We do this by changing the level first and then read out the current
950 * brightness level, if the value does not match, find out if it is using
951 * index. If not, clear the _BQC/_BCQ capability.
953 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
954 int max_level, int current_level)
956 struct acpi_video_device_brightness *br = device->brightness;
958 unsigned long long level;
961 /* don't mess with existing known broken systems */
962 if (bqc_offset_aml_bug_workaround)
966 * Some systems always report current brightness level as maximum
967 * through _BQC, we need to test another value for them.
969 test_level = current_level == max_level ? br->levels[3] : max_level;
971 result = acpi_video_device_lcd_set_level(device, test_level);
975 result = acpi_video_device_lcd_get_level_current(device, &level, true);
979 if (level != test_level) {
980 /* buggy _BQC found, need to find out if it uses index */
981 if (level < br->count) {
982 if (br->flags._BCL_reversed)
983 level = br->count - 3 - level;
984 if (br->levels[level + 2] == test_level)
985 br->flags._BQC_use_index = 1;
988 if (!br->flags._BQC_use_index)
989 device->cap._BQC = device->cap._BCQ = 0;
998 * device : video output device (LCD, CRT, ..)
1001 * Maximum brightness level
1003 * Allocate and initialize device->brightness.
1007 acpi_video_init_brightness(struct acpi_video_device *device)
1009 union acpi_object *obj = NULL;
1010 int i, max_level = 0, count = 0, level_ac_battery = 0;
1011 unsigned long long level, level_old;
1012 union acpi_object *o;
1013 struct acpi_video_device_brightness *br = NULL;
1014 int result = -EINVAL;
1017 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
1018 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
1019 "LCD brightness level\n"));
1023 if (obj->package.count < 2)
1026 br = kzalloc(sizeof(*br), GFP_KERNEL);
1028 printk(KERN_ERR "can't allocate memory\n");
1033 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
1040 for (i = 0; i < obj->package.count; i++) {
1041 o = (union acpi_object *)&obj->package.elements[i];
1042 if (o->type != ACPI_TYPE_INTEGER) {
1043 printk(KERN_ERR PREFIX "Invalid data\n");
1046 value = (u32) o->integer.value;
1047 /* Skip duplicate entries */
1048 if (count > 2 && br->levels[count - 1] == value)
1051 br->levels[count] = value;
1053 if (br->levels[count] > max_level)
1054 max_level = br->levels[count];
1059 * some buggy BIOS don't export the levels
1060 * when machine is on AC/Battery in _BCL package.
1061 * In this case, the first two elements in _BCL packages
1062 * are also supported brightness levels that OS should take care of.
1064 for (i = 2; i < count; i++) {
1065 if (br->levels[i] == br->levels[0])
1067 if (br->levels[i] == br->levels[1])
1071 if (level_ac_battery < 2) {
1072 level_ac_battery = 2 - level_ac_battery;
1073 br->flags._BCL_no_ac_battery_levels = 1;
1074 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1075 br->levels[i] = br->levels[i - level_ac_battery];
1076 count += level_ac_battery;
1077 } else if (level_ac_battery > 2)
1078 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
1080 /* Check if the _BCL package is in a reversed order */
1081 if (max_level == br->levels[2]) {
1082 br->flags._BCL_reversed = 1;
1083 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1084 acpi_video_cmp_level, NULL);
1085 } else if (max_level != br->levels[count - 1])
1086 ACPI_ERROR((AE_INFO,
1087 "Found unordered _BCL package"));
1090 device->brightness = br;
1092 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
1093 br->curr = level = max_level;
1095 if (!device->cap._BQC)
1098 result = acpi_video_device_lcd_get_level_current(device,
1101 goto out_free_levels;
1103 result = acpi_video_bqc_quirk(device, max_level, level_old);
1105 goto out_free_levels;
1107 * cap._BQC may get cleared due to _BQC is found to be broken
1108 * in acpi_video_bqc_quirk, so check again here.
1110 if (!device->cap._BQC)
1113 level = acpi_video_bqc_value_to_level(device, level_old);
1115 * On some buggy laptops, _BQC returns an uninitialized
1116 * value when invoked for the first time, i.e.
1117 * level_old is invalid (no matter whether it's a level
1118 * or an index). Set the backlight to max_level in this case.
1120 for (i = 2; i < br->count; i++)
1121 if (level == br->levels[i])
1123 if (i == br->count || !level)
1127 result = acpi_video_device_lcd_set_level(device, level);
1129 goto out_free_levels;
1131 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1132 "found %d brightness levels\n", count - 2));
1141 device->brightness = NULL;
1148 * device : video output device (LCD, CRT, ..)
1153 * Find out all required AML methods defined under the output
1157 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1159 if (acpi_has_method(device->dev->handle, "_ADR"))
1160 device->cap._ADR = 1;
1161 if (acpi_has_method(device->dev->handle, "_BCL"))
1162 device->cap._BCL = 1;
1163 if (acpi_has_method(device->dev->handle, "_BCM"))
1164 device->cap._BCM = 1;
1165 if (acpi_has_method(device->dev->handle, "_BQC")) {
1166 device->cap._BQC = 1;
1167 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1168 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1169 device->cap._BCQ = 1;
1172 if (acpi_has_method(device->dev->handle, "_DDC"))
1173 device->cap._DDC = 1;
1178 * device : video output device (VGA)
1183 * Find out all required AML methods defined under the video bus device.
1186 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1188 if (acpi_has_method(video->device->handle, "_DOS"))
1189 video->cap._DOS = 1;
1190 if (acpi_has_method(video->device->handle, "_DOD"))
1191 video->cap._DOD = 1;
1192 if (acpi_has_method(video->device->handle, "_ROM"))
1193 video->cap._ROM = 1;
1194 if (acpi_has_method(video->device->handle, "_GPD"))
1195 video->cap._GPD = 1;
1196 if (acpi_has_method(video->device->handle, "_SPD"))
1197 video->cap._SPD = 1;
1198 if (acpi_has_method(video->device->handle, "_VPO"))
1199 video->cap._VPO = 1;
1203 * Check whether the video bus device has required AML method to
1204 * support the desired features
1207 static int acpi_video_bus_check(struct acpi_video_bus *video)
1209 acpi_status status = -ENOENT;
1210 struct pci_dev *dev;
1215 dev = acpi_get_pci_dev(video->device->handle);
1221 * Since there is no HID, CID and so on for VGA driver, we have
1222 * to check well known required nodes.
1225 /* Does this device support video switching? */
1226 if (video->cap._DOS || video->cap._DOD) {
1227 if (!video->cap._DOS) {
1228 printk(KERN_WARNING FW_BUG
1229 "ACPI(%s) defines _DOD but not _DOS\n",
1230 acpi_device_bid(video->device));
1232 video->flags.multihead = 1;
1236 /* Does this device support retrieving a video ROM? */
1237 if (video->cap._ROM) {
1238 video->flags.rom = 1;
1242 /* Does this device support configuring which video device to POST? */
1243 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1244 video->flags.post = 1;
1252 * --------------------------------------------------------------------------
1254 * --------------------------------------------------------------------------
1257 /* device interface */
1258 static struct acpi_video_device_attrib *
1259 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1261 struct acpi_video_enumerated_device *ids;
1264 for (i = 0; i < video->attached_count; i++) {
1265 ids = &video->attached_array[i];
1266 if ((ids->value.int_val & 0xffff) == device_id)
1267 return &ids->value.attrib;
1274 acpi_video_get_device_type(struct acpi_video_bus *video,
1275 unsigned long device_id)
1277 struct acpi_video_enumerated_device *ids;
1280 for (i = 0; i < video->attached_count; i++) {
1281 ids = &video->attached_array[i];
1282 if ((ids->value.int_val & 0xffff) == device_id)
1283 return ids->value.int_val;
1290 acpi_video_bus_get_one_device(struct acpi_device *device,
1291 struct acpi_video_bus *video)
1293 unsigned long long device_id;
1294 int status, device_type;
1295 struct acpi_video_device *data;
1296 struct acpi_video_device_attrib *attribute;
1299 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1300 /* Some device omits _ADR, we skip them instead of fail */
1301 if (ACPI_FAILURE(status))
1304 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1308 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1309 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1310 device->driver_data = data;
1312 data->device_id = device_id;
1313 data->video = video;
1315 INIT_DELAYED_WORK(&data->switch_brightness_work,
1316 acpi_video_switch_brightness);
1318 attribute = acpi_video_get_device_attr(video, device_id);
1320 if (attribute && attribute->device_id_scheme) {
1321 switch (attribute->display_type) {
1322 case ACPI_VIDEO_DISPLAY_CRT:
1323 data->flags.crt = 1;
1325 case ACPI_VIDEO_DISPLAY_TV:
1326 data->flags.tvout = 1;
1328 case ACPI_VIDEO_DISPLAY_DVI:
1329 data->flags.dvi = 1;
1331 case ACPI_VIDEO_DISPLAY_LCD:
1332 data->flags.lcd = 1;
1335 data->flags.unknown = 1;
1338 if (attribute->bios_can_detect)
1339 data->flags.bios = 1;
1341 /* Check for legacy IDs */
1342 device_type = acpi_video_get_device_type(video, device_id);
1343 /* Ignore bits 16 and 18-20 */
1344 switch (device_type & 0xffe2ffff) {
1345 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1346 data->flags.crt = 1;
1348 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1349 data->flags.lcd = 1;
1351 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1352 data->flags.tvout = 1;
1355 data->flags.unknown = 1;
1359 acpi_video_device_bind(video, data);
1360 acpi_video_device_find_cap(data);
1362 mutex_lock(&video->device_list_lock);
1363 list_add_tail(&data->entry, &video->video_device_list);
1364 mutex_unlock(&video->device_list_lock);
1371 * video : video bus device
1376 * Enumerate the video device list of the video bus,
1377 * bind the ids with the corresponding video devices
1378 * under the video bus.
1381 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1383 struct acpi_video_device *dev;
1385 mutex_lock(&video->device_list_lock);
1387 list_for_each_entry(dev, &video->video_device_list, entry)
1388 acpi_video_device_bind(video, dev);
1390 mutex_unlock(&video->device_list_lock);
1395 * video : video bus device
1396 * device : video output device under the video
1402 * Bind the ids with the corresponding video devices
1403 * under the video bus.
1407 acpi_video_device_bind(struct acpi_video_bus *video,
1408 struct acpi_video_device *device)
1410 struct acpi_video_enumerated_device *ids;
1413 for (i = 0; i < video->attached_count; i++) {
1414 ids = &video->attached_array[i];
1415 if (device->device_id == (ids->value.int_val & 0xffff)) {
1416 ids->bind_info = device;
1417 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1424 * video : video bus device
1429 * Call _DOD to enumerate all devices attached to display adapter
1433 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1438 struct acpi_video_enumerated_device *active_list;
1439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1440 union acpi_object *dod = NULL;
1441 union acpi_object *obj;
1443 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1444 if (!ACPI_SUCCESS(status)) {
1445 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1449 dod = buffer.pointer;
1450 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1451 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1456 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1457 dod->package.count));
1459 active_list = kcalloc(1 + dod->package.count,
1460 sizeof(struct acpi_video_enumerated_device),
1468 for (i = 0; i < dod->package.count; i++) {
1469 obj = &dod->package.elements[i];
1471 if (obj->type != ACPI_TYPE_INTEGER) {
1472 printk(KERN_ERR PREFIX
1473 "Invalid _DOD data in element %d\n", i);
1477 active_list[count].value.int_val = obj->integer.value;
1478 active_list[count].bind_info = NULL;
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1480 (int)obj->integer.value));
1484 kfree(video->attached_array);
1486 video->attached_array = active_list;
1487 video->attached_count = count;
1490 kfree(buffer.pointer);
1495 acpi_video_get_next_level(struct acpi_video_device *device,
1496 u32 level_current, u32 event)
1498 int min, max, min_above, max_below, i, l, delta = 255;
1499 max = max_below = 0;
1500 min = min_above = 255;
1501 /* Find closest level to level_current */
1502 for (i = 2; i < device->brightness->count; i++) {
1503 l = device->brightness->levels[i];
1504 if (abs(l - level_current) < abs(delta)) {
1505 delta = l - level_current;
1510 /* Ajust level_current to closest available level */
1511 level_current += delta;
1512 for (i = 2; i < device->brightness->count; i++) {
1513 l = device->brightness->levels[i];
1518 if (l < min_above && l > level_current)
1520 if (l > max_below && l < level_current)
1525 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1526 return (level_current < max) ? min_above : min;
1527 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1528 return (level_current < max) ? min_above : max;
1529 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1530 return (level_current > min) ? max_below : min;
1531 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1532 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1535 return level_current;
1540 acpi_video_switch_brightness(struct work_struct *work)
1542 struct acpi_video_device *device = container_of(to_delayed_work(work),
1543 struct acpi_video_device, switch_brightness_work);
1544 unsigned long long level_current, level_next;
1545 int event = device->switch_brightness_event;
1546 int result = -EINVAL;
1548 /* no warning message if acpi_backlight=vendor or a quirk is used */
1549 if (!acpi_video_verify_backlight_support())
1552 if (!device->brightness)
1555 result = acpi_video_device_lcd_get_level_current(device,
1561 level_next = acpi_video_get_next_level(device, level_current, event);
1563 result = acpi_video_device_lcd_set_level(device, level_next);
1566 backlight_force_update(device->backlight,
1567 BACKLIGHT_UPDATE_HOTKEY);
1571 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1574 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1577 struct acpi_video_bus *video;
1578 struct acpi_video_device *video_device;
1579 union acpi_object *buffer = NULL;
1583 if (!device || !acpi_driver_data(device))
1586 video = acpi_driver_data(device);
1588 for (i = 0; i < video->attached_count; i++) {
1589 video_device = video->attached_array[i].bind_info;
1595 if (!video_device->cap._DDC)
1600 case ACPI_VIDEO_DISPLAY_CRT:
1601 if (!video_device->flags.crt)
1604 case ACPI_VIDEO_DISPLAY_TV:
1605 if (!video_device->flags.tvout)
1608 case ACPI_VIDEO_DISPLAY_DVI:
1609 if (!video_device->flags.dvi)
1612 case ACPI_VIDEO_DISPLAY_LCD:
1613 if (!video_device->flags.lcd)
1617 } else if (video_device->device_id != device_id) {
1621 status = acpi_video_device_EDID(video_device, &buffer, length);
1623 if (ACPI_FAILURE(status) || !buffer ||
1624 buffer->type != ACPI_TYPE_BUFFER) {
1626 status = acpi_video_device_EDID(video_device, &buffer,
1628 if (ACPI_FAILURE(status) || !buffer ||
1629 buffer->type != ACPI_TYPE_BUFFER) {
1634 *edid = buffer->buffer.pointer;
1640 EXPORT_SYMBOL(acpi_video_get_edid);
1643 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1644 struct acpi_device *device)
1647 struct acpi_device *dev;
1650 * There are systems where video module known to work fine regardless
1651 * of broken _DOD and ignoring returned value here doesn't cause
1654 acpi_video_device_enumerate(video);
1656 list_for_each_entry(dev, &device->children, node) {
1658 status = acpi_video_bus_get_one_device(dev, video);
1660 dev_err(&dev->dev, "Can't attach device\n");
1667 /* acpi_video interface */
1670 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1671 * preform any automatic brightness change on receiving a notification.
1673 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1675 return acpi_video_bus_DOS(video, 0,
1676 acpi_osi_is_win8() ? 1 : 0);
1679 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1681 return acpi_video_bus_DOS(video, 0,
1682 acpi_osi_is_win8() ? 0 : 1);
1685 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1687 struct acpi_video_bus *video = acpi_driver_data(device);
1688 struct input_dev *input;
1691 if (!video || !video->input)
1694 input = video->input;
1697 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1698 * most likely via hotkey. */
1699 keycode = KEY_SWITCHVIDEOMODE;
1702 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1704 acpi_video_device_enumerate(video);
1705 acpi_video_device_rebind(video);
1706 keycode = KEY_SWITCHVIDEOMODE;
1709 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1710 keycode = KEY_SWITCHVIDEOMODE;
1712 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1713 keycode = KEY_VIDEO_NEXT;
1715 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1716 keycode = KEY_VIDEO_PREV;
1720 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1721 "Unsupported event [0x%x]\n", event));
1725 if (acpi_notifier_call_chain(device, event, 0))
1726 /* Something vetoed the keypress. */
1730 input_report_key(input, keycode, 1);
1732 input_report_key(input, keycode, 0);
1739 static void brightness_switch_event(struct acpi_video_device *video_device,
1742 if (!brightness_switch_enabled)
1745 video_device->switch_brightness_event = event;
1746 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1749 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1751 struct acpi_video_device *video_device = data;
1752 struct acpi_device *device = NULL;
1753 struct acpi_video_bus *bus;
1754 struct input_dev *input;
1760 device = video_device->dev;
1761 bus = video_device->video;
1765 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1766 brightness_switch_event(video_device, event);
1767 keycode = KEY_BRIGHTNESS_CYCLE;
1769 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1770 brightness_switch_event(video_device, event);
1771 keycode = KEY_BRIGHTNESSUP;
1773 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1774 brightness_switch_event(video_device, event);
1775 keycode = KEY_BRIGHTNESSDOWN;
1777 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1778 brightness_switch_event(video_device, event);
1779 keycode = KEY_BRIGHTNESS_ZERO;
1781 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1782 brightness_switch_event(video_device, event);
1783 keycode = KEY_DISPLAY_OFF;
1786 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1787 "Unsupported event [0x%x]\n", event));
1791 acpi_notifier_call_chain(device, event, 0);
1794 input_report_key(input, keycode, 1);
1796 input_report_key(input, keycode, 0);
1803 static int acpi_video_resume(struct notifier_block *nb,
1804 unsigned long val, void *ign)
1806 struct acpi_video_bus *video;
1807 struct acpi_video_device *video_device;
1811 case PM_HIBERNATION_PREPARE:
1812 case PM_SUSPEND_PREPARE:
1813 case PM_RESTORE_PREPARE:
1817 video = container_of(nb, struct acpi_video_bus, pm_nb);
1819 dev_info(&video->device->dev, "Restoring backlight state\n");
1821 for (i = 0; i < video->attached_count; i++) {
1822 video_device = video->attached_array[i].bind_info;
1823 if (video_device && video_device->backlight)
1824 acpi_video_set_brightness(video_device->backlight);
1831 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1832 void **return_value)
1834 struct acpi_device *device = context;
1835 struct acpi_device *sibling;
1838 if (handle == device->handle)
1839 return AE_CTRL_TERMINATE;
1841 result = acpi_bus_get_device(handle, &sibling);
1845 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1846 return AE_ALREADY_EXISTS;
1851 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1853 struct backlight_properties props;
1854 struct pci_dev *pdev;
1855 acpi_handle acpi_parent;
1856 struct device *parent = NULL;
1861 result = acpi_video_init_brightness(device);
1864 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1869 acpi_get_parent(device->dev->handle, &acpi_parent);
1871 pdev = acpi_get_pci_dev(acpi_parent);
1873 parent = &pdev->dev;
1877 memset(&props, 0, sizeof(struct backlight_properties));
1878 props.type = BACKLIGHT_FIRMWARE;
1879 props.max_brightness = device->brightness->count - 3;
1880 device->backlight = backlight_device_register(name,
1883 &acpi_backlight_ops,
1886 if (IS_ERR(device->backlight))
1890 * Save current brightness level in case we have to restore it
1891 * before acpi_video_device_lcd_set_level() is called next time.
1893 device->backlight->props.brightness =
1894 acpi_video_get_brightness(device->backlight);
1896 device->cooling_dev = thermal_cooling_device_register("LCD",
1897 device->dev, &video_cooling_ops);
1898 if (IS_ERR(device->cooling_dev)) {
1900 * Set cooling_dev to NULL so we don't crash trying to free it.
1901 * Also, why the hell we are returning early and not attempt to
1902 * register video output if cooling device registration failed?
1905 device->cooling_dev = NULL;
1909 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1910 device->cooling_dev->id);
1911 result = sysfs_create_link(&device->dev->dev.kobj,
1912 &device->cooling_dev->device.kobj,
1915 printk(KERN_ERR PREFIX "Create sysfs link\n");
1916 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1917 &device->dev->dev.kobj, "device");
1919 printk(KERN_ERR PREFIX "Create sysfs link\n");
1922 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1924 struct acpi_video_device *dev;
1926 if (video->backlight_registered)
1929 if (!acpi_video_verify_backlight_support())
1932 mutex_lock(&video->device_list_lock);
1933 list_for_each_entry(dev, &video->video_device_list, entry)
1934 acpi_video_dev_register_backlight(dev);
1935 mutex_unlock(&video->device_list_lock);
1937 video->backlight_registered = true;
1939 video->pm_nb.notifier_call = acpi_video_resume;
1940 video->pm_nb.priority = 0;
1941 return register_pm_notifier(&video->pm_nb);
1944 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1946 if (device->backlight) {
1947 backlight_device_unregister(device->backlight);
1948 device->backlight = NULL;
1950 if (device->brightness) {
1951 kfree(device->brightness->levels);
1952 kfree(device->brightness);
1953 device->brightness = NULL;
1955 if (device->cooling_dev) {
1956 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1957 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1958 thermal_cooling_device_unregister(device->cooling_dev);
1959 device->cooling_dev = NULL;
1963 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1965 struct acpi_video_device *dev;
1968 if (!video->backlight_registered)
1971 error = unregister_pm_notifier(&video->pm_nb);
1973 mutex_lock(&video->device_list_lock);
1974 list_for_each_entry(dev, &video->video_device_list, entry)
1975 acpi_video_dev_unregister_backlight(dev);
1976 mutex_unlock(&video->device_list_lock);
1978 video->backlight_registered = false;
1983 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1986 struct acpi_device *adev = device->dev;
1988 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1989 acpi_video_device_notify, device);
1990 if (ACPI_FAILURE(status))
1991 dev_err(&adev->dev, "Error installing notify handler\n");
1993 device->flags.notify = 1;
1996 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1998 struct input_dev *input;
1999 struct acpi_video_device *dev;
2002 video->input = input = input_allocate_device();
2008 error = acpi_video_bus_start_devices(video);
2010 goto err_free_input;
2012 snprintf(video->phys, sizeof(video->phys),
2013 "%s/video/input0", acpi_device_hid(video->device));
2015 input->name = acpi_device_name(video->device);
2016 input->phys = video->phys;
2017 input->id.bustype = BUS_HOST;
2018 input->id.product = 0x06;
2019 input->dev.parent = &video->device->dev;
2020 input->evbit[0] = BIT(EV_KEY);
2021 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2022 set_bit(KEY_VIDEO_NEXT, input->keybit);
2023 set_bit(KEY_VIDEO_PREV, input->keybit);
2024 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2025 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2026 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2027 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2028 set_bit(KEY_DISPLAY_OFF, input->keybit);
2030 error = input_register_device(input);
2034 mutex_lock(&video->device_list_lock);
2035 list_for_each_entry(dev, &video->video_device_list, entry)
2036 acpi_video_dev_add_notify_handler(dev);
2037 mutex_unlock(&video->device_list_lock);
2042 acpi_video_bus_stop_devices(video);
2044 input_free_device(input);
2045 video->input = NULL;
2050 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2052 if (dev->flags.notify) {
2053 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2054 acpi_video_device_notify);
2055 dev->flags.notify = 0;
2059 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2061 struct acpi_video_device *dev;
2063 mutex_lock(&video->device_list_lock);
2064 list_for_each_entry(dev, &video->video_device_list, entry)
2065 acpi_video_dev_remove_notify_handler(dev);
2066 mutex_unlock(&video->device_list_lock);
2068 acpi_video_bus_stop_devices(video);
2069 input_unregister_device(video->input);
2070 video->input = NULL;
2073 static int acpi_video_backlight_notify(struct notifier_block *nb,
2074 unsigned long val, void *bd)
2076 struct backlight_device *backlight = bd;
2077 struct acpi_video_bus *video;
2079 /* acpi_video_verify_backlight_support only cares about raw devices */
2080 if (backlight->props.type != BACKLIGHT_RAW)
2083 video = container_of(nb, struct acpi_video_bus, backlight_nb);
2086 case BACKLIGHT_REGISTERED:
2087 if (!acpi_video_verify_backlight_support())
2088 acpi_video_bus_unregister_backlight(video);
2090 case BACKLIGHT_UNREGISTERED:
2091 acpi_video_bus_register_backlight(video);
2098 static int acpi_video_bus_add_backlight_notify_handler(
2099 struct acpi_video_bus *video)
2103 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2104 video->backlight_nb.priority = 0;
2105 error = backlight_register_notifier(&video->backlight_nb);
2107 video->backlight_notifier_registered = true;
2112 static int acpi_video_bus_remove_backlight_notify_handler(
2113 struct acpi_video_bus *video)
2115 if (!video->backlight_notifier_registered)
2118 video->backlight_notifier_registered = false;
2120 return backlight_unregister_notifier(&video->backlight_nb);
2123 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2125 struct acpi_video_device *dev, *next;
2127 mutex_lock(&video->device_list_lock);
2128 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2129 list_del(&dev->entry);
2132 mutex_unlock(&video->device_list_lock);
2137 static int instance;
2139 static int acpi_video_bus_add(struct acpi_device *device)
2141 struct acpi_video_bus *video;
2145 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2146 device->parent->handle, 1,
2147 acpi_video_bus_match, NULL,
2149 if (status == AE_ALREADY_EXISTS) {
2150 printk(KERN_WARNING FW_BUG
2151 "Duplicate ACPI video bus devices for the"
2152 " same VGA controller, please try module "
2153 "parameter \"video.allow_duplicates=1\""
2154 "if the current driver doesn't work.\n");
2155 if (!allow_duplicates)
2159 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2163 /* a hack to fix the duplicate name "VID" problem on T61 */
2164 if (!strcmp(device->pnp.bus_id, "VID")) {
2166 device->pnp.bus_id[3] = '0' + instance;
2169 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2170 if (!strcmp(device->pnp.bus_id, "VGA")) {
2172 device->pnp.bus_id[3] = '0' + instance;
2176 video->device = device;
2177 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2178 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2179 device->driver_data = video;
2181 acpi_video_bus_find_cap(video);
2182 error = acpi_video_bus_check(video);
2184 goto err_free_video;
2186 mutex_init(&video->device_list_lock);
2187 INIT_LIST_HEAD(&video->video_device_list);
2189 error = acpi_video_bus_get_devices(video, device);
2193 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2194 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2195 video->flags.multihead ? "yes" : "no",
2196 video->flags.rom ? "yes" : "no",
2197 video->flags.post ? "yes" : "no");
2198 mutex_lock(&video_list_lock);
2199 list_add_tail(&video->entry, &video_bus_head);
2200 mutex_unlock(&video_list_lock);
2202 acpi_video_bus_register_backlight(video);
2203 acpi_video_bus_add_notify_handler(video);
2204 acpi_video_bus_add_backlight_notify_handler(video);
2209 acpi_video_bus_put_devices(video);
2210 kfree(video->attached_array);
2213 device->driver_data = NULL;
2218 static int acpi_video_bus_remove(struct acpi_device *device)
2220 struct acpi_video_bus *video = NULL;
2223 if (!device || !acpi_driver_data(device))
2226 video = acpi_driver_data(device);
2228 acpi_video_bus_remove_backlight_notify_handler(video);
2229 acpi_video_bus_remove_notify_handler(video);
2230 acpi_video_bus_unregister_backlight(video);
2231 acpi_video_bus_put_devices(video);
2233 mutex_lock(&video_list_lock);
2234 list_del(&video->entry);
2235 mutex_unlock(&video_list_lock);
2237 kfree(video->attached_array);
2243 static int __init is_i740(struct pci_dev *dev)
2245 if (dev->device == 0x00D1)
2247 if (dev->device == 0x7000)
2252 static int __init intel_opregion_present(void)
2255 struct pci_dev *dev = NULL;
2258 for_each_pci_dev(dev) {
2259 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2261 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2263 /* We don't want to poke around undefined i740 registers */
2266 pci_read_config_dword(dev, 0xfc, &address);
2274 int acpi_video_register(void)
2277 if (register_count) {
2279 * if the function of acpi_video_register is already called,
2280 * don't register the acpi_vide_bus again and return no error.
2285 mutex_init(&video_list_lock);
2286 INIT_LIST_HEAD(&video_bus_head);
2288 result = acpi_bus_register_driver(&acpi_video_bus);
2293 * When the acpi_video_bus is loaded successfully, increase
2294 * the counter reference.
2300 EXPORT_SYMBOL(acpi_video_register);
2302 void acpi_video_unregister(void)
2304 if (!register_count) {
2306 * If the acpi video bus is already unloaded, don't
2307 * unload it again and return directly.
2311 acpi_bus_unregister_driver(&acpi_video_bus);
2317 EXPORT_SYMBOL(acpi_video_unregister);
2319 void acpi_video_unregister_backlight(void)
2321 struct acpi_video_bus *video;
2323 if (!register_count)
2326 mutex_lock(&video_list_lock);
2327 list_for_each_entry(video, &video_bus_head, entry)
2328 acpi_video_bus_unregister_backlight(video);
2329 mutex_unlock(&video_list_lock);
2331 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2334 * This is kind of nasty. Hardware using Intel chipsets may require
2335 * the video opregion code to be run first in order to initialise
2336 * state before any ACPI video calls are made. To handle this we defer
2337 * registration of the video class until the opregion code has run.
2340 static int __init acpi_video_init(void)
2342 dmi_check_system(video_dmi_table);
2344 if (intel_opregion_present())
2347 return acpi_video_register();
2350 static void __exit acpi_video_exit(void)
2352 acpi_video_unregister();
2357 module_init(acpi_video_init);
2358 module_exit(acpi_video_exit);