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 <asm/uaccess.h>
42 #define PREFIX "ACPI: "
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
46 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
47 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
48 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
58 #define MAX_NAME_LEN 20
60 #define _COMPONENT ACPI_VIDEO_COMPONENT
61 ACPI_MODULE_NAME("video");
63 MODULE_AUTHOR("Bruno Ducrot");
64 MODULE_DESCRIPTION("ACPI Video Driver");
65 MODULE_LICENSE("GPL");
67 static bool brightness_switch_enabled = 1;
68 module_param(brightness_switch_enabled, bool, 0644);
71 * By default, we don't allow duplicate ACPI video bus devices
72 * under the same VGA controller
74 static bool allow_duplicates;
75 module_param(allow_duplicates, bool, 0644);
77 static int disable_backlight_sysfs_if = -1;
78 module_param(disable_backlight_sysfs_if, int, 0444);
80 #define REPORT_OUTPUT_KEY_EVENTS 0x01
81 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
82 static int report_key_events = -1;
83 module_param(report_key_events, int, 0644);
84 MODULE_PARM_DESC(report_key_events,
85 "0: none, 1: output changes, 2: brightness changes, 3: all");
87 static bool device_id_scheme = false;
88 module_param(device_id_scheme, bool, 0444);
90 static bool only_lcd = false;
91 module_param(only_lcd, bool, 0444);
93 static int register_count;
94 static DEFINE_MUTEX(register_count_mutex);
95 static DEFINE_MUTEX(video_list_lock);
96 static LIST_HEAD(video_bus_head);
97 static int acpi_video_bus_add(struct acpi_device *device);
98 static int acpi_video_bus_remove(struct acpi_device *device);
99 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
100 void acpi_video_detect_exit(void);
102 static const struct acpi_device_id video_device_ids[] = {
106 MODULE_DEVICE_TABLE(acpi, video_device_ids);
108 static struct acpi_driver acpi_video_bus = {
110 .class = ACPI_VIDEO_CLASS,
111 .ids = video_device_ids,
113 .add = acpi_video_bus_add,
114 .remove = acpi_video_bus_remove,
115 .notify = acpi_video_bus_notify,
119 struct acpi_video_bus_flags {
120 u8 multihead:1; /* can switch video heads */
121 u8 rom:1; /* can retrieve a video rom */
122 u8 post:1; /* can configure the head to */
126 struct acpi_video_bus_cap {
127 u8 _DOS:1; /* Enable/Disable output switching */
128 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
129 u8 _ROM:1; /* Get ROM Data */
130 u8 _GPD:1; /* Get POST Device */
131 u8 _SPD:1; /* Set POST Device */
132 u8 _VPO:1; /* Video POST Options */
136 struct acpi_video_device_attrib {
137 u32 display_index:4; /* A zero-based instance of the Display */
138 u32 display_port_attachment:4; /* This field differentiates the display type */
139 u32 display_type:4; /* Describe the specific type in use */
140 u32 vendor_specific:4; /* Chipset Vendor Specific */
141 u32 bios_can_detect:1; /* BIOS can detect the device */
142 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
144 u32 pipe_id:3; /* For VGA multiple-head devices. */
145 u32 reserved:10; /* Must be 0 */
146 u32 device_id_scheme:1; /* Device ID Scheme */
149 struct acpi_video_enumerated_device {
152 struct acpi_video_device_attrib attrib;
154 struct acpi_video_device *bind_info;
157 struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
161 struct acpi_video_enumerated_device *attached_array;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
174 struct acpi_video_device_flags {
185 struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
194 struct acpi_video_brightness_flags {
195 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
196 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
197 u8 _BQC_use_index:1; /* _BQC returns an index value */
200 struct acpi_video_device_brightness {
204 struct acpi_video_brightness_flags flags;
207 struct acpi_video_device {
208 unsigned long device_id;
209 struct acpi_video_device_flags flags;
210 struct acpi_video_device_cap cap;
211 struct list_head entry;
212 struct delayed_work switch_brightness_work;
213 int switch_brightness_event;
214 struct acpi_video_bus *video;
215 struct acpi_device *dev;
216 struct acpi_video_device_brightness *brightness;
217 struct backlight_device *backlight;
218 struct thermal_cooling_device *cooling_dev;
221 static const char device_decode[][30] = {
222 "motherboard VGA device",
228 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
229 static void acpi_video_device_rebind(struct acpi_video_bus *video);
230 static void acpi_video_device_bind(struct acpi_video_bus *video,
231 struct acpi_video_device *device);
232 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
233 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
235 static int acpi_video_device_lcd_get_level_current(
236 struct acpi_video_device *device,
237 unsigned long long *level, bool raw);
238 static int acpi_video_get_next_level(struct acpi_video_device *device,
239 u32 level_current, u32 event);
240 static void acpi_video_switch_brightness(struct work_struct *work);
242 /* backlight device sysfs support */
243 static int acpi_video_get_brightness(struct backlight_device *bd)
245 unsigned long long cur_level;
247 struct acpi_video_device *vd = bl_get_data(bd);
249 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
251 for (i = 2; i < vd->brightness->count; i++) {
252 if (vd->brightness->levels[i] == cur_level)
254 * The first two entries are special - see page 575
255 * of the ACPI spec 3.0
262 static int acpi_video_set_brightness(struct backlight_device *bd)
264 int request_level = bd->props.brightness + 2;
265 struct acpi_video_device *vd = bl_get_data(bd);
267 cancel_delayed_work(&vd->switch_brightness_work);
268 return acpi_video_device_lcd_set_level(vd,
269 vd->brightness->levels[request_level]);
272 static const struct backlight_ops acpi_backlight_ops = {
273 .get_brightness = acpi_video_get_brightness,
274 .update_status = acpi_video_set_brightness,
277 /* thermal cooling device callbacks */
278 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
281 struct acpi_device *device = cooling_dev->devdata;
282 struct acpi_video_device *video = acpi_driver_data(device);
284 *state = video->brightness->count - 3;
288 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
293 unsigned long long level;
296 if (acpi_video_device_lcd_get_level_current(video, &level, false))
298 for (offset = 2; offset < video->brightness->count; offset++)
299 if (level == video->brightness->levels[offset]) {
300 *state = video->brightness->count - offset - 1;
308 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
310 struct acpi_device *device = cooling_dev->devdata;
311 struct acpi_video_device *video = acpi_driver_data(device);
314 if (state >= video->brightness->count - 2)
317 state = video->brightness->count - state;
318 level = video->brightness->levels[state - 1];
319 return acpi_video_device_lcd_set_level(video, level);
322 static const struct thermal_cooling_device_ops video_cooling_ops = {
323 .get_max_state = video_get_max_state,
324 .get_cur_state = video_get_cur_state,
325 .set_cur_state = video_set_cur_state,
329 * --------------------------------------------------------------------------
331 * --------------------------------------------------------------------------
335 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
336 union acpi_object **levels)
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 union acpi_object *obj;
345 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
346 if (!ACPI_SUCCESS(status))
348 obj = (union acpi_object *)buffer.pointer;
349 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
350 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
360 kfree(buffer.pointer);
366 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
371 status = acpi_execute_simple_method(device->dev->handle,
373 if (ACPI_FAILURE(status)) {
374 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
378 device->brightness->curr = level;
379 for (state = 2; state < device->brightness->count; state++)
380 if (level == device->brightness->levels[state]) {
381 if (device->backlight)
382 device->backlight->props.brightness = state - 2;
386 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
391 * For some buggy _BQC methods, we need to add a constant value to
392 * the _BQC return value to get the actual current brightness level
395 static int bqc_offset_aml_bug_workaround;
396 static int video_set_bqc_offset(const struct dmi_system_id *d)
398 bqc_offset_aml_bug_workaround = 9;
402 static int video_disable_backlight_sysfs_if(
403 const struct dmi_system_id *d)
405 if (disable_backlight_sysfs_if == -1)
406 disable_backlight_sysfs_if = 1;
410 static int video_set_device_id_scheme(const struct dmi_system_id *d)
412 device_id_scheme = true;
416 static int video_enable_only_lcd(const struct dmi_system_id *d)
422 static int video_set_report_key_events(const struct dmi_system_id *id)
424 if (report_key_events == -1)
425 report_key_events = (uintptr_t)id->driver_data;
429 static struct dmi_system_id video_dmi_table[] = {
431 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5720",
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
442 .callback = video_set_bqc_offset,
443 .ident = "Acer Aspire 5710Z",
445 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
450 .callback = video_set_bqc_offset,
451 .ident = "eMachines E510",
453 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 5315",
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
466 .callback = video_set_bqc_offset,
467 .ident = "Acer Aspire 7720",
469 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
470 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
475 * Some machines have a broken acpi-video interface for brightness
476 * control, but still need an acpi_video_device_lcd_set_level() call
477 * on resume to turn the backlight power on. We Enable backlight
478 * control on these systems, but do not register a backlight sysfs
479 * as brightness control does not work.
482 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
483 .callback = video_disable_backlight_sysfs_if,
484 .ident = "Toshiba Portege R700",
486 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
487 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
491 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
492 .callback = video_disable_backlight_sysfs_if,
493 .ident = "Toshiba Portege R830",
495 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
500 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
501 .callback = video_disable_backlight_sysfs_if,
502 .ident = "Toshiba Satellite R830",
504 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
509 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
510 * but the IDs actually follow the Device ID Scheme.
513 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
514 .callback = video_set_device_id_scheme,
515 .ident = "ESPRIMO Mobile M9410",
517 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
518 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
522 * Some machines have multiple video output devices, but only the one
523 * that is the type of LCD can do the backlight control so we should not
524 * register backlight interface for other video output devices.
527 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
528 .callback = video_enable_only_lcd,
529 .ident = "ESPRIMO Mobile M9410",
531 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
532 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
536 * Some machines report wrong key events on the acpi-bus, suppress
537 * key event reporting on these. Note this is only intended to work
538 * around events which are plain wrong. In some cases we get double
539 * events, in this case acpi-video is considered the canonical source
540 * and the events from the other source should be filtered. E.g.
541 * by calling acpi_video_handles_brightness_key_presses() from the
542 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
545 .callback = video_set_report_key_events,
546 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
547 .ident = "Dell Vostro V131",
549 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
550 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
556 static unsigned long long
557 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
558 unsigned long long bqc_value)
560 unsigned long long level;
562 if (device->brightness->flags._BQC_use_index) {
564 * _BQC returns an index that doesn't account for
565 * the first 2 items with special meaning, so we need
566 * to compensate for that by offsetting ourselves
568 if (device->brightness->flags._BCL_reversed)
569 bqc_value = device->brightness->count - 3 - bqc_value;
571 level = device->brightness->levels[bqc_value + 2];
576 level += bqc_offset_aml_bug_workaround;
582 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
583 unsigned long long *level, bool raw)
585 acpi_status status = AE_OK;
588 if (device->cap._BQC || device->cap._BCQ) {
589 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
591 status = acpi_evaluate_integer(device->dev->handle, buf,
593 if (ACPI_SUCCESS(status)) {
596 * Caller has indicated he wants the raw
597 * value returned by _BQC, so don't furtherly
598 * mess with the value.
603 *level = acpi_video_bqc_value_to_level(device, *level);
605 for (i = 2; i < device->brightness->count; i++)
606 if (device->brightness->levels[i] == *level) {
607 device->brightness->curr = *level;
611 * BQC returned an invalid level.
614 ACPI_WARNING((AE_INFO,
615 "%s returned an invalid level",
617 device->cap._BQC = device->cap._BCQ = 0;
621 * should we return an error or ignore this failure?
622 * dev->brightness->curr is a cached value which stores
623 * the correct current backlight level in most cases.
624 * ACPI video backlight still works w/ buggy _BQC.
625 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
627 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
628 device->cap._BQC = device->cap._BCQ = 0;
632 *level = device->brightness->curr;
637 acpi_video_device_EDID(struct acpi_video_device *device,
638 union acpi_object **edid, ssize_t length)
641 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
642 union acpi_object *obj;
643 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
644 struct acpi_object_list args = { 1, &arg0 };
652 arg0.integer.value = 1;
653 else if (length == 256)
654 arg0.integer.value = 2;
658 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
659 if (ACPI_FAILURE(status))
662 obj = buffer.pointer;
664 if (obj && obj->type == ACPI_TYPE_BUFFER)
667 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
679 * video : video bus device pointer
681 * 0. The system BIOS should NOT automatically switch(toggle)
682 * the active display output.
683 * 1. The system BIOS should automatically switch (toggle) the
684 * active display output. No switch event.
685 * 2. The _DGS value should be locked.
686 * 3. The system BIOS should not automatically switch (toggle) the
687 * active display output, but instead generate the display switch
690 * 0. The system BIOS should automatically control the brightness level
691 * of the LCD when the power changes from AC to DC
692 * 1. The system BIOS should NOT automatically control the brightness
693 * level of the LCD when the power changes from AC to DC.
699 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
703 if (!video->cap._DOS)
706 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
708 video->dos_setting = (lcd_flag << 2) | bios_flag;
709 status = acpi_execute_simple_method(video->device->handle, "_DOS",
710 (lcd_flag << 2) | bios_flag);
711 if (ACPI_FAILURE(status))
718 * Simple comparison function used to sort backlight levels.
722 acpi_video_cmp_level(const void *a, const void *b)
724 return *(int *)a - *(int *)b;
728 * Decides if _BQC/_BCQ for this system is usable
730 * We do this by changing the level first and then read out the current
731 * brightness level, if the value does not match, find out if it is using
732 * index. If not, clear the _BQC/_BCQ capability.
734 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
735 int max_level, int current_level)
737 struct acpi_video_device_brightness *br = device->brightness;
739 unsigned long long level;
742 /* don't mess with existing known broken systems */
743 if (bqc_offset_aml_bug_workaround)
747 * Some systems always report current brightness level as maximum
748 * through _BQC, we need to test another value for them.
750 test_level = current_level == max_level ? br->levels[3] : max_level;
752 result = acpi_video_device_lcd_set_level(device, test_level);
756 result = acpi_video_device_lcd_get_level_current(device, &level, true);
760 if (level != test_level) {
761 /* buggy _BQC found, need to find out if it uses index */
762 if (level < br->count) {
763 if (br->flags._BCL_reversed)
764 level = br->count - 3 - level;
765 if (br->levels[level + 2] == test_level)
766 br->flags._BQC_use_index = 1;
769 if (!br->flags._BQC_use_index)
770 device->cap._BQC = device->cap._BCQ = 0;
779 * device : video output device (LCD, CRT, ..)
782 * Maximum brightness level
784 * Allocate and initialize device->brightness.
788 acpi_video_init_brightness(struct acpi_video_device *device)
790 union acpi_object *obj = NULL;
791 int i, max_level = 0, count = 0, level_ac_battery = 0;
792 unsigned long long level, level_old;
793 union acpi_object *o;
794 struct acpi_video_device_brightness *br = NULL;
795 int result = -EINVAL;
798 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
800 "LCD brightness level\n"));
804 if (obj->package.count < 2)
807 br = kzalloc(sizeof(*br), GFP_KERNEL);
809 printk(KERN_ERR "can't allocate memory\n");
814 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
821 for (i = 0; i < obj->package.count; i++) {
822 o = (union acpi_object *)&obj->package.elements[i];
823 if (o->type != ACPI_TYPE_INTEGER) {
824 printk(KERN_ERR PREFIX "Invalid data\n");
827 value = (u32) o->integer.value;
828 /* Skip duplicate entries */
829 if (count > 2 && br->levels[count - 1] == value)
832 br->levels[count] = value;
834 if (br->levels[count] > max_level)
835 max_level = br->levels[count];
840 * some buggy BIOS don't export the levels
841 * when machine is on AC/Battery in _BCL package.
842 * In this case, the first two elements in _BCL packages
843 * are also supported brightness levels that OS should take care of.
845 for (i = 2; i < count; i++) {
846 if (br->levels[i] == br->levels[0])
848 if (br->levels[i] == br->levels[1])
852 if (level_ac_battery < 2) {
853 level_ac_battery = 2 - level_ac_battery;
854 br->flags._BCL_no_ac_battery_levels = 1;
855 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
856 br->levels[i] = br->levels[i - level_ac_battery];
857 count += level_ac_battery;
858 } else if (level_ac_battery > 2)
859 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
861 /* Check if the _BCL package is in a reversed order */
862 if (max_level == br->levels[2]) {
863 br->flags._BCL_reversed = 1;
864 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
865 acpi_video_cmp_level, NULL);
866 } else if (max_level != br->levels[count - 1])
868 "Found unordered _BCL package"));
871 device->brightness = br;
873 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
874 br->curr = level = max_level;
876 if (!device->cap._BQC)
879 result = acpi_video_device_lcd_get_level_current(device,
882 goto out_free_levels;
884 result = acpi_video_bqc_quirk(device, max_level, level_old);
886 goto out_free_levels;
888 * cap._BQC may get cleared due to _BQC is found to be broken
889 * in acpi_video_bqc_quirk, so check again here.
891 if (!device->cap._BQC)
894 level = acpi_video_bqc_value_to_level(device, level_old);
896 * On some buggy laptops, _BQC returns an uninitialized
897 * value when invoked for the first time, i.e.
898 * level_old is invalid (no matter whether it's a level
899 * or an index). Set the backlight to max_level in this case.
901 for (i = 2; i < br->count; i++)
902 if (level == br->levels[i])
904 if (i == br->count || !level)
908 result = acpi_video_device_lcd_set_level(device, level);
910 goto out_free_levels;
912 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
913 "found %d brightness levels\n", count - 2));
922 device->brightness = NULL;
929 * device : video output device (LCD, CRT, ..)
934 * Find out all required AML methods defined under the output
938 static void acpi_video_device_find_cap(struct acpi_video_device *device)
940 if (acpi_has_method(device->dev->handle, "_ADR"))
941 device->cap._ADR = 1;
942 if (acpi_has_method(device->dev->handle, "_BCL"))
943 device->cap._BCL = 1;
944 if (acpi_has_method(device->dev->handle, "_BCM"))
945 device->cap._BCM = 1;
946 if (acpi_has_method(device->dev->handle, "_BQC")) {
947 device->cap._BQC = 1;
948 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
949 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
950 device->cap._BCQ = 1;
953 if (acpi_has_method(device->dev->handle, "_DDC"))
954 device->cap._DDC = 1;
959 * device : video output device (VGA)
964 * Find out all required AML methods defined under the video bus device.
967 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
969 if (acpi_has_method(video->device->handle, "_DOS"))
971 if (acpi_has_method(video->device->handle, "_DOD"))
973 if (acpi_has_method(video->device->handle, "_ROM"))
975 if (acpi_has_method(video->device->handle, "_GPD"))
977 if (acpi_has_method(video->device->handle, "_SPD"))
979 if (acpi_has_method(video->device->handle, "_VPO"))
984 * Check whether the video bus device has required AML method to
985 * support the desired features
988 static int acpi_video_bus_check(struct acpi_video_bus *video)
990 acpi_status status = -ENOENT;
996 dev = acpi_get_pci_dev(video->device->handle);
1002 * Since there is no HID, CID and so on for VGA driver, we have
1003 * to check well known required nodes.
1006 /* Does this device support video switching? */
1007 if (video->cap._DOS || video->cap._DOD) {
1008 if (!video->cap._DOS) {
1009 printk(KERN_WARNING FW_BUG
1010 "ACPI(%s) defines _DOD but not _DOS\n",
1011 acpi_device_bid(video->device));
1013 video->flags.multihead = 1;
1017 /* Does this device support retrieving a video ROM? */
1018 if (video->cap._ROM) {
1019 video->flags.rom = 1;
1023 /* Does this device support configuring which video device to POST? */
1024 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1025 video->flags.post = 1;
1033 * --------------------------------------------------------------------------
1035 * --------------------------------------------------------------------------
1038 /* device interface */
1039 static struct acpi_video_device_attrib *
1040 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1042 struct acpi_video_enumerated_device *ids;
1045 for (i = 0; i < video->attached_count; i++) {
1046 ids = &video->attached_array[i];
1047 if ((ids->value.int_val & 0xffff) == device_id)
1048 return &ids->value.attrib;
1055 acpi_video_get_device_type(struct acpi_video_bus *video,
1056 unsigned long device_id)
1058 struct acpi_video_enumerated_device *ids;
1061 for (i = 0; i < video->attached_count; i++) {
1062 ids = &video->attached_array[i];
1063 if ((ids->value.int_val & 0xffff) == device_id)
1064 return ids->value.int_val;
1071 acpi_video_bus_get_one_device(struct acpi_device *device,
1072 struct acpi_video_bus *video)
1074 unsigned long long device_id;
1075 int status, device_type;
1076 struct acpi_video_device *data;
1077 struct acpi_video_device_attrib *attribute;
1080 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1081 /* Some device omits _ADR, we skip them instead of fail */
1082 if (ACPI_FAILURE(status))
1085 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1089 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1090 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1091 device->driver_data = data;
1093 data->device_id = device_id;
1094 data->video = video;
1096 INIT_DELAYED_WORK(&data->switch_brightness_work,
1097 acpi_video_switch_brightness);
1099 attribute = acpi_video_get_device_attr(video, device_id);
1101 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1102 switch (attribute->display_type) {
1103 case ACPI_VIDEO_DISPLAY_CRT:
1104 data->flags.crt = 1;
1106 case ACPI_VIDEO_DISPLAY_TV:
1107 data->flags.tvout = 1;
1109 case ACPI_VIDEO_DISPLAY_DVI:
1110 data->flags.dvi = 1;
1112 case ACPI_VIDEO_DISPLAY_LCD:
1113 data->flags.lcd = 1;
1116 data->flags.unknown = 1;
1119 if (attribute->bios_can_detect)
1120 data->flags.bios = 1;
1122 /* Check for legacy IDs */
1123 device_type = acpi_video_get_device_type(video, device_id);
1124 /* Ignore bits 16 and 18-20 */
1125 switch (device_type & 0xffe2ffff) {
1126 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1127 data->flags.crt = 1;
1129 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1130 data->flags.lcd = 1;
1132 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1133 data->flags.tvout = 1;
1136 data->flags.unknown = 1;
1140 acpi_video_device_bind(video, data);
1141 acpi_video_device_find_cap(data);
1143 mutex_lock(&video->device_list_lock);
1144 list_add_tail(&data->entry, &video->video_device_list);
1145 mutex_unlock(&video->device_list_lock);
1152 * video : video bus device
1157 * Enumerate the video device list of the video bus,
1158 * bind the ids with the corresponding video devices
1159 * under the video bus.
1162 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1164 struct acpi_video_device *dev;
1166 mutex_lock(&video->device_list_lock);
1168 list_for_each_entry(dev, &video->video_device_list, entry)
1169 acpi_video_device_bind(video, dev);
1171 mutex_unlock(&video->device_list_lock);
1176 * video : video bus device
1177 * device : video output device under the video
1183 * Bind the ids with the corresponding video devices
1184 * under the video bus.
1188 acpi_video_device_bind(struct acpi_video_bus *video,
1189 struct acpi_video_device *device)
1191 struct acpi_video_enumerated_device *ids;
1194 for (i = 0; i < video->attached_count; i++) {
1195 ids = &video->attached_array[i];
1196 if (device->device_id == (ids->value.int_val & 0xffff)) {
1197 ids->bind_info = device;
1198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1203 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1205 struct acpi_video_bus *video = device->video;
1209 * If we have a broken _DOD or we have more than 8 output devices
1210 * under the graphics controller node that we can't proper deal with
1211 * in the operation region code currently, no need to test.
1213 if (!video->attached_count || video->child_count > 8)
1216 for (i = 0; i < video->attached_count; i++) {
1217 if ((video->attached_array[i].value.int_val & 0xfff) ==
1218 (device->device_id & 0xfff))
1227 * video : video bus device
1232 * Call _DOD to enumerate all devices attached to display adapter
1236 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1241 struct acpi_video_enumerated_device *active_list;
1242 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1243 union acpi_object *dod = NULL;
1244 union acpi_object *obj;
1246 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1247 if (!ACPI_SUCCESS(status)) {
1248 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1252 dod = buffer.pointer;
1253 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1254 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1259 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1260 dod->package.count));
1262 active_list = kcalloc(1 + dod->package.count,
1263 sizeof(struct acpi_video_enumerated_device),
1271 for (i = 0; i < dod->package.count; i++) {
1272 obj = &dod->package.elements[i];
1274 if (obj->type != ACPI_TYPE_INTEGER) {
1275 printk(KERN_ERR PREFIX
1276 "Invalid _DOD data in element %d\n", i);
1280 active_list[count].value.int_val = obj->integer.value;
1281 active_list[count].bind_info = NULL;
1282 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1283 (int)obj->integer.value));
1287 kfree(video->attached_array);
1289 video->attached_array = active_list;
1290 video->attached_count = count;
1293 kfree(buffer.pointer);
1298 acpi_video_get_next_level(struct acpi_video_device *device,
1299 u32 level_current, u32 event)
1301 int min, max, min_above, max_below, i, l, delta = 255;
1302 max = max_below = 0;
1303 min = min_above = 255;
1304 /* Find closest level to level_current */
1305 for (i = 2; i < device->brightness->count; i++) {
1306 l = device->brightness->levels[i];
1307 if (abs(l - level_current) < abs(delta)) {
1308 delta = l - level_current;
1313 /* Ajust level_current to closest available level */
1314 level_current += delta;
1315 for (i = 2; i < device->brightness->count; i++) {
1316 l = device->brightness->levels[i];
1321 if (l < min_above && l > level_current)
1323 if (l > max_below && l < level_current)
1328 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1329 return (level_current < max) ? min_above : min;
1330 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1331 return (level_current < max) ? min_above : max;
1332 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1333 return (level_current > min) ? max_below : min;
1334 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1335 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1338 return level_current;
1343 acpi_video_switch_brightness(struct work_struct *work)
1345 struct acpi_video_device *device = container_of(to_delayed_work(work),
1346 struct acpi_video_device, switch_brightness_work);
1347 unsigned long long level_current, level_next;
1348 int event = device->switch_brightness_event;
1349 int result = -EINVAL;
1351 /* no warning message if acpi_backlight=vendor or a quirk is used */
1352 if (!device->backlight)
1355 if (!device->brightness)
1358 result = acpi_video_device_lcd_get_level_current(device,
1364 level_next = acpi_video_get_next_level(device, level_current, event);
1366 result = acpi_video_device_lcd_set_level(device, level_next);
1369 backlight_force_update(device->backlight,
1370 BACKLIGHT_UPDATE_HOTKEY);
1374 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1377 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1380 struct acpi_video_bus *video;
1381 struct acpi_video_device *video_device;
1382 union acpi_object *buffer = NULL;
1386 if (!device || !acpi_driver_data(device))
1389 video = acpi_driver_data(device);
1391 for (i = 0; i < video->attached_count; i++) {
1392 video_device = video->attached_array[i].bind_info;
1398 if (!video_device->cap._DDC)
1403 case ACPI_VIDEO_DISPLAY_CRT:
1404 if (!video_device->flags.crt)
1407 case ACPI_VIDEO_DISPLAY_TV:
1408 if (!video_device->flags.tvout)
1411 case ACPI_VIDEO_DISPLAY_DVI:
1412 if (!video_device->flags.dvi)
1415 case ACPI_VIDEO_DISPLAY_LCD:
1416 if (!video_device->flags.lcd)
1420 } else if (video_device->device_id != device_id) {
1424 status = acpi_video_device_EDID(video_device, &buffer, length);
1426 if (ACPI_FAILURE(status) || !buffer ||
1427 buffer->type != ACPI_TYPE_BUFFER) {
1429 status = acpi_video_device_EDID(video_device, &buffer,
1431 if (ACPI_FAILURE(status) || !buffer ||
1432 buffer->type != ACPI_TYPE_BUFFER) {
1437 *edid = buffer->buffer.pointer;
1443 EXPORT_SYMBOL(acpi_video_get_edid);
1446 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1447 struct acpi_device *device)
1450 struct acpi_device *dev;
1453 * There are systems where video module known to work fine regardless
1454 * of broken _DOD and ignoring returned value here doesn't cause
1457 acpi_video_device_enumerate(video);
1459 list_for_each_entry(dev, &device->children, node) {
1461 status = acpi_video_bus_get_one_device(dev, video);
1463 dev_err(&dev->dev, "Can't attach device\n");
1466 video->child_count++;
1471 /* acpi_video interface */
1474 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1475 * preform any automatic brightness change on receiving a notification.
1477 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1479 return acpi_video_bus_DOS(video, 0,
1480 acpi_osi_is_win8() ? 1 : 0);
1483 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1485 return acpi_video_bus_DOS(video, 0,
1486 acpi_osi_is_win8() ? 0 : 1);
1489 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1491 struct acpi_video_bus *video = acpi_driver_data(device);
1492 struct input_dev *input;
1495 if (!video || !video->input)
1498 input = video->input;
1501 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1502 * most likely via hotkey. */
1503 keycode = KEY_SWITCHVIDEOMODE;
1506 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1508 acpi_video_device_enumerate(video);
1509 acpi_video_device_rebind(video);
1510 keycode = KEY_SWITCHVIDEOMODE;
1513 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1514 keycode = KEY_SWITCHVIDEOMODE;
1516 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1517 keycode = KEY_VIDEO_NEXT;
1519 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1520 keycode = KEY_VIDEO_PREV;
1524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1525 "Unsupported event [0x%x]\n", event));
1529 if (acpi_notifier_call_chain(device, event, 0))
1530 /* Something vetoed the keypress. */
1533 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1534 input_report_key(input, keycode, 1);
1536 input_report_key(input, keycode, 0);
1543 static void brightness_switch_event(struct acpi_video_device *video_device,
1546 if (!brightness_switch_enabled)
1549 video_device->switch_brightness_event = event;
1550 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1553 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1555 struct acpi_video_device *video_device = data;
1556 struct acpi_device *device = NULL;
1557 struct acpi_video_bus *bus;
1558 struct input_dev *input;
1564 device = video_device->dev;
1565 bus = video_device->video;
1569 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1570 brightness_switch_event(video_device, event);
1571 keycode = KEY_BRIGHTNESS_CYCLE;
1573 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1574 brightness_switch_event(video_device, event);
1575 keycode = KEY_BRIGHTNESSUP;
1577 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1578 brightness_switch_event(video_device, event);
1579 keycode = KEY_BRIGHTNESSDOWN;
1581 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1582 brightness_switch_event(video_device, event);
1583 keycode = KEY_BRIGHTNESS_ZERO;
1585 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1586 brightness_switch_event(video_device, event);
1587 keycode = KEY_DISPLAY_OFF;
1590 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1591 "Unsupported event [0x%x]\n", event));
1595 acpi_notifier_call_chain(device, event, 0);
1597 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1598 input_report_key(input, keycode, 1);
1600 input_report_key(input, keycode, 0);
1607 static int acpi_video_resume(struct notifier_block *nb,
1608 unsigned long val, void *ign)
1610 struct acpi_video_bus *video;
1611 struct acpi_video_device *video_device;
1615 case PM_HIBERNATION_PREPARE:
1616 case PM_SUSPEND_PREPARE:
1617 case PM_RESTORE_PREPARE:
1621 video = container_of(nb, struct acpi_video_bus, pm_nb);
1623 dev_info(&video->device->dev, "Restoring backlight state\n");
1625 for (i = 0; i < video->attached_count; i++) {
1626 video_device = video->attached_array[i].bind_info;
1627 if (video_device && video_device->brightness)
1628 acpi_video_device_lcd_set_level(video_device,
1629 video_device->brightness->curr);
1636 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1637 void **return_value)
1639 struct acpi_device *device = context;
1640 struct acpi_device *sibling;
1643 if (handle == device->handle)
1644 return AE_CTRL_TERMINATE;
1646 result = acpi_bus_get_device(handle, &sibling);
1650 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1651 return AE_ALREADY_EXISTS;
1656 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1658 struct backlight_properties props;
1659 struct pci_dev *pdev;
1660 acpi_handle acpi_parent;
1661 struct device *parent = NULL;
1666 result = acpi_video_init_brightness(device);
1670 if (disable_backlight_sysfs_if > 0)
1673 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1678 acpi_get_parent(device->dev->handle, &acpi_parent);
1680 pdev = acpi_get_pci_dev(acpi_parent);
1682 parent = &pdev->dev;
1686 memset(&props, 0, sizeof(struct backlight_properties));
1687 props.type = BACKLIGHT_FIRMWARE;
1688 props.max_brightness = device->brightness->count - 3;
1689 device->backlight = backlight_device_register(name,
1692 &acpi_backlight_ops,
1695 if (IS_ERR(device->backlight)) {
1696 device->backlight = NULL;
1701 * Save current brightness level in case we have to restore it
1702 * before acpi_video_device_lcd_set_level() is called next time.
1704 device->backlight->props.brightness =
1705 acpi_video_get_brightness(device->backlight);
1707 device->cooling_dev = thermal_cooling_device_register("LCD",
1708 device->dev, &video_cooling_ops);
1709 if (IS_ERR(device->cooling_dev)) {
1711 * Set cooling_dev to NULL so we don't crash trying to free it.
1712 * Also, why the hell we are returning early and not attempt to
1713 * register video output if cooling device registration failed?
1716 device->cooling_dev = NULL;
1720 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1721 device->cooling_dev->id);
1722 result = sysfs_create_link(&device->dev->dev.kobj,
1723 &device->cooling_dev->device.kobj,
1726 printk(KERN_ERR PREFIX "Create sysfs link\n");
1727 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1728 &device->dev->dev.kobj, "device");
1730 printk(KERN_ERR PREFIX "Create sysfs link\n");
1733 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1735 struct acpi_video_device *dev;
1736 union acpi_object *levels;
1738 mutex_lock(&video->device_list_lock);
1739 list_for_each_entry(dev, &video->video_device_list, entry) {
1740 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1743 mutex_unlock(&video->device_list_lock);
1746 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1749 * Do not create backlight device for video output
1750 * device that is not in the enumerated list.
1752 if (!acpi_video_device_in_dod(dev)) {
1753 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1758 return dev->flags.lcd;
1762 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1764 struct acpi_video_device *dev;
1766 if (video->backlight_registered)
1769 acpi_video_run_bcl_for_osi(video);
1771 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1774 mutex_lock(&video->device_list_lock);
1775 list_for_each_entry(dev, &video->video_device_list, entry) {
1776 if (acpi_video_should_register_backlight(dev))
1777 acpi_video_dev_register_backlight(dev);
1779 mutex_unlock(&video->device_list_lock);
1781 video->backlight_registered = true;
1783 video->pm_nb.notifier_call = acpi_video_resume;
1784 video->pm_nb.priority = 0;
1785 return register_pm_notifier(&video->pm_nb);
1788 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1790 if (device->backlight) {
1791 backlight_device_unregister(device->backlight);
1792 device->backlight = NULL;
1794 if (device->brightness) {
1795 kfree(device->brightness->levels);
1796 kfree(device->brightness);
1797 device->brightness = NULL;
1799 if (device->cooling_dev) {
1800 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1801 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1802 thermal_cooling_device_unregister(device->cooling_dev);
1803 device->cooling_dev = NULL;
1807 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1809 struct acpi_video_device *dev;
1812 if (!video->backlight_registered)
1815 error = unregister_pm_notifier(&video->pm_nb);
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_unregister_backlight(dev);
1820 mutex_unlock(&video->device_list_lock);
1822 video->backlight_registered = false;
1827 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1830 struct acpi_device *adev = device->dev;
1832 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1833 acpi_video_device_notify, device);
1834 if (ACPI_FAILURE(status))
1835 dev_err(&adev->dev, "Error installing notify handler\n");
1837 device->flags.notify = 1;
1840 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1842 struct input_dev *input;
1843 struct acpi_video_device *dev;
1846 video->input = input = input_allocate_device();
1852 error = acpi_video_bus_start_devices(video);
1854 goto err_free_input;
1856 snprintf(video->phys, sizeof(video->phys),
1857 "%s/video/input0", acpi_device_hid(video->device));
1859 input->name = acpi_device_name(video->device);
1860 input->phys = video->phys;
1861 input->id.bustype = BUS_HOST;
1862 input->id.product = 0x06;
1863 input->dev.parent = &video->device->dev;
1864 input->evbit[0] = BIT(EV_KEY);
1865 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1866 set_bit(KEY_VIDEO_NEXT, input->keybit);
1867 set_bit(KEY_VIDEO_PREV, input->keybit);
1868 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1869 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1870 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1871 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1872 set_bit(KEY_DISPLAY_OFF, input->keybit);
1874 error = input_register_device(input);
1878 mutex_lock(&video->device_list_lock);
1879 list_for_each_entry(dev, &video->video_device_list, entry)
1880 acpi_video_dev_add_notify_handler(dev);
1881 mutex_unlock(&video->device_list_lock);
1886 acpi_video_bus_stop_devices(video);
1888 input_free_device(input);
1889 video->input = NULL;
1894 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1896 if (dev->flags.notify) {
1897 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1898 acpi_video_device_notify);
1899 dev->flags.notify = 0;
1903 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1905 struct acpi_video_device *dev;
1907 mutex_lock(&video->device_list_lock);
1908 list_for_each_entry(dev, &video->video_device_list, entry)
1909 acpi_video_dev_remove_notify_handler(dev);
1910 mutex_unlock(&video->device_list_lock);
1912 acpi_video_bus_stop_devices(video);
1913 input_unregister_device(video->input);
1914 video->input = NULL;
1917 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1919 struct acpi_video_device *dev, *next;
1921 mutex_lock(&video->device_list_lock);
1922 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1923 list_del(&dev->entry);
1926 mutex_unlock(&video->device_list_lock);
1931 static int instance;
1933 static int acpi_video_bus_add(struct acpi_device *device)
1935 struct acpi_video_bus *video;
1939 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1940 device->parent->handle, 1,
1941 acpi_video_bus_match, NULL,
1943 if (status == AE_ALREADY_EXISTS) {
1944 printk(KERN_WARNING FW_BUG
1945 "Duplicate ACPI video bus devices for the"
1946 " same VGA controller, please try module "
1947 "parameter \"video.allow_duplicates=1\""
1948 "if the current driver doesn't work.\n");
1949 if (!allow_duplicates)
1953 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1957 /* a hack to fix the duplicate name "VID" problem on T61 */
1958 if (!strcmp(device->pnp.bus_id, "VID")) {
1960 device->pnp.bus_id[3] = '0' + instance;
1963 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1964 if (!strcmp(device->pnp.bus_id, "VGA")) {
1966 device->pnp.bus_id[3] = '0' + instance;
1970 video->device = device;
1971 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1972 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1973 device->driver_data = video;
1975 acpi_video_bus_find_cap(video);
1976 error = acpi_video_bus_check(video);
1978 goto err_free_video;
1980 mutex_init(&video->device_list_lock);
1981 INIT_LIST_HEAD(&video->video_device_list);
1983 error = acpi_video_bus_get_devices(video, device);
1987 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1988 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1989 video->flags.multihead ? "yes" : "no",
1990 video->flags.rom ? "yes" : "no",
1991 video->flags.post ? "yes" : "no");
1992 mutex_lock(&video_list_lock);
1993 list_add_tail(&video->entry, &video_bus_head);
1994 mutex_unlock(&video_list_lock);
1996 acpi_video_bus_register_backlight(video);
1997 acpi_video_bus_add_notify_handler(video);
2002 acpi_video_bus_put_devices(video);
2003 kfree(video->attached_array);
2006 device->driver_data = NULL;
2011 static int acpi_video_bus_remove(struct acpi_device *device)
2013 struct acpi_video_bus *video = NULL;
2016 if (!device || !acpi_driver_data(device))
2019 video = acpi_driver_data(device);
2021 acpi_video_bus_remove_notify_handler(video);
2022 acpi_video_bus_unregister_backlight(video);
2023 acpi_video_bus_put_devices(video);
2025 mutex_lock(&video_list_lock);
2026 list_del(&video->entry);
2027 mutex_unlock(&video_list_lock);
2029 kfree(video->attached_array);
2035 static int __init is_i740(struct pci_dev *dev)
2037 if (dev->device == 0x00D1)
2039 if (dev->device == 0x7000)
2044 static int __init intel_opregion_present(void)
2047 struct pci_dev *dev = NULL;
2050 for_each_pci_dev(dev) {
2051 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2053 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2055 /* We don't want to poke around undefined i740 registers */
2058 pci_read_config_dword(dev, 0xfc, &address);
2066 int acpi_video_register(void)
2070 mutex_lock(®ister_count_mutex);
2071 if (register_count) {
2073 * if the function of acpi_video_register is already called,
2074 * don't register the acpi_vide_bus again and return no error.
2079 dmi_check_system(video_dmi_table);
2081 ret = acpi_bus_register_driver(&acpi_video_bus);
2086 * When the acpi_video_bus is loaded successfully, increase
2087 * the counter reference.
2092 mutex_unlock(®ister_count_mutex);
2095 EXPORT_SYMBOL(acpi_video_register);
2097 void acpi_video_unregister(void)
2099 mutex_lock(®ister_count_mutex);
2100 if (register_count) {
2101 acpi_bus_unregister_driver(&acpi_video_bus);
2104 mutex_unlock(®ister_count_mutex);
2106 EXPORT_SYMBOL(acpi_video_unregister);
2108 void acpi_video_unregister_backlight(void)
2110 struct acpi_video_bus *video;
2112 mutex_lock(®ister_count_mutex);
2113 if (register_count) {
2114 mutex_lock(&video_list_lock);
2115 list_for_each_entry(video, &video_bus_head, entry)
2116 acpi_video_bus_unregister_backlight(video);
2117 mutex_unlock(&video_list_lock);
2119 mutex_unlock(®ister_count_mutex);
2122 bool acpi_video_handles_brightness_key_presses(void)
2124 bool have_video_busses;
2126 mutex_lock(&video_list_lock);
2127 have_video_busses = !list_empty(&video_bus_head);
2128 mutex_unlock(&video_list_lock);
2130 return have_video_busses &&
2131 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2133 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2136 * This is kind of nasty. Hardware using Intel chipsets may require
2137 * the video opregion code to be run first in order to initialise
2138 * state before any ACPI video calls are made. To handle this we defer
2139 * registration of the video class until the opregion code has run.
2142 static int __init acpi_video_init(void)
2145 * Let the module load even if ACPI is disabled (e.g. due to
2146 * a broken BIOS) so that i915.ko can still be loaded on such
2147 * old systems without an AcpiOpRegion.
2149 * acpi_video_register() will report -ENODEV later as well due
2150 * to acpi_disabled when i915.ko tries to register itself afterwards.
2155 if (intel_opregion_present())
2158 return acpi_video_register();
2161 static void __exit acpi_video_exit(void)
2163 acpi_video_detect_exit();
2164 acpi_video_unregister();
2169 module_init(acpi_video_init);
2170 module_exit(acpi_video_exit);