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 static bool device_id_scheme = false;
81 module_param(device_id_scheme, bool, 0444);
83 static bool only_lcd = false;
84 module_param(only_lcd, bool, 0444);
86 static int register_count;
87 static DEFINE_MUTEX(register_count_mutex);
88 static struct mutex video_list_lock;
89 static struct list_head video_bus_head;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93 void acpi_video_detect_exit(void);
95 static const struct acpi_device_id video_device_ids[] = {
99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101 static struct acpi_driver acpi_video_bus = {
103 .class = ACPI_VIDEO_CLASS,
104 .ids = video_device_ids,
106 .add = acpi_video_bus_add,
107 .remove = acpi_video_bus_remove,
108 .notify = acpi_video_bus_notify,
112 struct acpi_video_bus_flags {
113 u8 multihead:1; /* can switch video heads */
114 u8 rom:1; /* can retrieve a video rom */
115 u8 post:1; /* can configure the head to */
119 struct acpi_video_bus_cap {
120 u8 _DOS:1; /* Enable/Disable output switching */
121 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
122 u8 _ROM:1; /* Get ROM Data */
123 u8 _GPD:1; /* Get POST Device */
124 u8 _SPD:1; /* Set POST Device */
125 u8 _VPO:1; /* Video POST Options */
129 struct acpi_video_device_attrib {
130 u32 display_index:4; /* A zero-based instance of the Display */
131 u32 display_port_attachment:4; /* This field differentiates the display type */
132 u32 display_type:4; /* Describe the specific type in use */
133 u32 vendor_specific:4; /* Chipset Vendor Specific */
134 u32 bios_can_detect:1; /* BIOS can detect the device */
135 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 u32 pipe_id:3; /* For VGA multiple-head devices. */
138 u32 reserved:10; /* Must be 0 */
139 u32 device_id_scheme:1; /* Device ID Scheme */
142 struct acpi_video_enumerated_device {
145 struct acpi_video_device_attrib attrib;
147 struct acpi_video_device *bind_info;
150 struct acpi_video_bus {
151 struct acpi_device *device;
152 bool backlight_registered;
154 struct acpi_video_enumerated_device *attached_array;
157 struct acpi_video_bus_cap cap;
158 struct acpi_video_bus_flags flags;
159 struct list_head video_device_list;
160 struct mutex device_list_lock; /* protects video_device_list */
161 struct list_head entry;
162 struct input_dev *input;
163 char phys[32]; /* for input device */
164 struct notifier_block pm_nb;
167 struct acpi_video_device_flags {
178 struct acpi_video_device_cap {
179 u8 _ADR:1; /* Return the unique ID */
180 u8 _BCL:1; /* Query list of brightness control levels supported */
181 u8 _BCM:1; /* Set the brightness level */
182 u8 _BQC:1; /* Get current brightness level */
183 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
184 u8 _DDC:1; /* Return the EDID for this device */
187 struct acpi_video_brightness_flags {
188 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
189 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
190 u8 _BQC_use_index:1; /* _BQC returns an index value */
193 struct acpi_video_device_brightness {
197 struct acpi_video_brightness_flags flags;
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct delayed_work switch_brightness_work;
206 int switch_brightness_event;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
214 static const char device_decode[][30] = {
215 "motherboard VGA device",
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
230 unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
233 static void acpi_video_switch_brightness(struct work_struct *work);
235 /* backlight device sysfs support */
236 static int acpi_video_get_brightness(struct backlight_device *bd)
238 unsigned long long cur_level;
240 struct acpi_video_device *vd = bl_get_data(bd);
242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
244 for (i = 2; i < vd->brightness->count; i++) {
245 if (vd->brightness->levels[i] == cur_level)
247 * The first two entries are special - see page 575
248 * of the ACPI spec 3.0
255 static int acpi_video_set_brightness(struct backlight_device *bd)
257 int request_level = bd->props.brightness + 2;
258 struct acpi_video_device *vd = bl_get_data(bd);
260 cancel_delayed_work(&vd->switch_brightness_work);
261 return acpi_video_device_lcd_set_level(vd,
262 vd->brightness->levels[request_level]);
265 static const struct backlight_ops acpi_backlight_ops = {
266 .get_brightness = acpi_video_get_brightness,
267 .update_status = acpi_video_set_brightness,
270 /* thermal cooling device callbacks */
271 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
274 struct acpi_device *device = cooling_dev->devdata;
275 struct acpi_video_device *video = acpi_driver_data(device);
277 *state = video->brightness->count - 3;
281 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
284 struct acpi_device *device = cooling_dev->devdata;
285 struct acpi_video_device *video = acpi_driver_data(device);
286 unsigned long long level;
289 if (acpi_video_device_lcd_get_level_current(video, &level, false))
291 for (offset = 2; offset < video->brightness->count; offset++)
292 if (level == video->brightness->levels[offset]) {
293 *state = video->brightness->count - offset - 1;
301 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
307 if (state >= video->brightness->count - 2)
310 state = video->brightness->count - state;
311 level = video->brightness->levels[state - 1];
312 return acpi_video_device_lcd_set_level(video, level);
315 static const struct thermal_cooling_device_ops video_cooling_ops = {
316 .get_max_state = video_get_max_state,
317 .get_cur_state = video_get_cur_state,
318 .set_cur_state = video_set_cur_state,
322 * --------------------------------------------------------------------------
324 * --------------------------------------------------------------------------
328 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
329 union acpi_object **levels)
332 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
333 union acpi_object *obj;
338 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
339 if (!ACPI_SUCCESS(status))
341 obj = (union acpi_object *)buffer.pointer;
342 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
343 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
353 kfree(buffer.pointer);
359 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
364 status = acpi_execute_simple_method(device->dev->handle,
366 if (ACPI_FAILURE(status)) {
367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
371 device->brightness->curr = level;
372 for (state = 2; state < device->brightness->count; state++)
373 if (level == device->brightness->levels[state]) {
374 if (device->backlight)
375 device->backlight->props.brightness = state - 2;
379 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
388 static int bqc_offset_aml_bug_workaround;
389 static int video_set_bqc_offset(const struct dmi_system_id *d)
391 bqc_offset_aml_bug_workaround = 9;
395 static int video_disable_backlight_sysfs_if(
396 const struct dmi_system_id *d)
398 if (disable_backlight_sysfs_if == -1)
399 disable_backlight_sysfs_if = 1;
403 static int video_set_device_id_scheme(const struct dmi_system_id *d)
405 device_id_scheme = true;
409 static int video_enable_only_lcd(const struct dmi_system_id *d)
415 static struct dmi_system_id video_dmi_table[] = {
417 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
420 .callback = video_set_bqc_offset,
421 .ident = "Acer Aspire 5720",
423 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5710Z",
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
436 .callback = video_set_bqc_offset,
437 .ident = "eMachines E510",
439 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
444 .callback = video_set_bqc_offset,
445 .ident = "Acer Aspire 5315",
447 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
452 .callback = video_set_bqc_offset,
453 .ident = "Acer Aspire 7720",
455 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
461 * Some machines have a broken acpi-video interface for brightness
462 * control, but still need an acpi_video_device_lcd_set_level() call
463 * on resume to turn the backlight power on. We Enable backlight
464 * control on these systems, but do not register a backlight sysfs
465 * as brightness control does not work.
468 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
469 .callback = video_disable_backlight_sysfs_if,
470 .ident = "Toshiba Portege R700",
472 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
473 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
477 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
478 .callback = video_disable_backlight_sysfs_if,
479 .ident = "Toshiba Portege R830",
481 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
482 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
486 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
487 .callback = video_disable_backlight_sysfs_if,
488 .ident = "Toshiba Satellite R830",
490 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
491 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
495 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
496 * but the IDs actually follow the Device ID Scheme.
499 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
500 .callback = video_set_device_id_scheme,
501 .ident = "ESPRIMO Mobile M9410",
503 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
508 * Some machines have multiple video output devices, but only the one
509 * that is the type of LCD can do the backlight control so we should not
510 * register backlight interface for other video output devices.
513 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
514 .callback = video_enable_only_lcd,
515 .ident = "ESPRIMO Mobile M9410",
517 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
518 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
524 static unsigned long long
525 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
526 unsigned long long bqc_value)
528 unsigned long long level;
530 if (device->brightness->flags._BQC_use_index) {
532 * _BQC returns an index that doesn't account for
533 * the first 2 items with special meaning, so we need
534 * to compensate for that by offsetting ourselves
536 if (device->brightness->flags._BCL_reversed)
537 bqc_value = device->brightness->count - 3 - bqc_value;
539 level = device->brightness->levels[bqc_value + 2];
544 level += bqc_offset_aml_bug_workaround;
550 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
551 unsigned long long *level, bool raw)
553 acpi_status status = AE_OK;
556 if (device->cap._BQC || device->cap._BCQ) {
557 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
559 status = acpi_evaluate_integer(device->dev->handle, buf,
561 if (ACPI_SUCCESS(status)) {
564 * Caller has indicated he wants the raw
565 * value returned by _BQC, so don't furtherly
566 * mess with the value.
571 *level = acpi_video_bqc_value_to_level(device, *level);
573 for (i = 2; i < device->brightness->count; i++)
574 if (device->brightness->levels[i] == *level) {
575 device->brightness->curr = *level;
579 * BQC returned an invalid level.
582 ACPI_WARNING((AE_INFO,
583 "%s returned an invalid level",
585 device->cap._BQC = device->cap._BCQ = 0;
589 * should we return an error or ignore this failure?
590 * dev->brightness->curr is a cached value which stores
591 * the correct current backlight level in most cases.
592 * ACPI video backlight still works w/ buggy _BQC.
593 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
595 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
596 device->cap._BQC = device->cap._BCQ = 0;
600 *level = device->brightness->curr;
605 acpi_video_device_EDID(struct acpi_video_device *device,
606 union acpi_object **edid, ssize_t length)
609 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
610 union acpi_object *obj;
611 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
612 struct acpi_object_list args = { 1, &arg0 };
620 arg0.integer.value = 1;
621 else if (length == 256)
622 arg0.integer.value = 2;
626 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
627 if (ACPI_FAILURE(status))
630 obj = buffer.pointer;
632 if (obj && obj->type == ACPI_TYPE_BUFFER)
635 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
647 * video : video bus device pointer
649 * 0. The system BIOS should NOT automatically switch(toggle)
650 * the active display output.
651 * 1. The system BIOS should automatically switch (toggle) the
652 * active display output. No switch event.
653 * 2. The _DGS value should be locked.
654 * 3. The system BIOS should not automatically switch (toggle) the
655 * active display output, but instead generate the display switch
658 * 0. The system BIOS should automatically control the brightness level
659 * of the LCD when the power changes from AC to DC
660 * 1. The system BIOS should NOT automatically control the brightness
661 * level of the LCD when the power changes from AC to DC.
667 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
671 if (!video->cap._DOS)
674 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
676 video->dos_setting = (lcd_flag << 2) | bios_flag;
677 status = acpi_execute_simple_method(video->device->handle, "_DOS",
678 (lcd_flag << 2) | bios_flag);
679 if (ACPI_FAILURE(status))
686 * Simple comparison function used to sort backlight levels.
690 acpi_video_cmp_level(const void *a, const void *b)
692 return *(int *)a - *(int *)b;
696 * Decides if _BQC/_BCQ for this system is usable
698 * We do this by changing the level first and then read out the current
699 * brightness level, if the value does not match, find out if it is using
700 * index. If not, clear the _BQC/_BCQ capability.
702 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
703 int max_level, int current_level)
705 struct acpi_video_device_brightness *br = device->brightness;
707 unsigned long long level;
710 /* don't mess with existing known broken systems */
711 if (bqc_offset_aml_bug_workaround)
715 * Some systems always report current brightness level as maximum
716 * through _BQC, we need to test another value for them.
718 test_level = current_level == max_level ? br->levels[3] : max_level;
720 result = acpi_video_device_lcd_set_level(device, test_level);
724 result = acpi_video_device_lcd_get_level_current(device, &level, true);
728 if (level != test_level) {
729 /* buggy _BQC found, need to find out if it uses index */
730 if (level < br->count) {
731 if (br->flags._BCL_reversed)
732 level = br->count - 3 - level;
733 if (br->levels[level + 2] == test_level)
734 br->flags._BQC_use_index = 1;
737 if (!br->flags._BQC_use_index)
738 device->cap._BQC = device->cap._BCQ = 0;
747 * device : video output device (LCD, CRT, ..)
750 * Maximum brightness level
752 * Allocate and initialize device->brightness.
756 acpi_video_init_brightness(struct acpi_video_device *device)
758 union acpi_object *obj = NULL;
759 int i, max_level = 0, count = 0, level_ac_battery = 0;
760 unsigned long long level, level_old;
761 union acpi_object *o;
762 struct acpi_video_device_brightness *br = NULL;
763 int result = -EINVAL;
766 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
767 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
768 "LCD brightness level\n"));
772 if (obj->package.count < 2)
775 br = kzalloc(sizeof(*br), GFP_KERNEL);
777 printk(KERN_ERR "can't allocate memory\n");
782 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
789 for (i = 0; i < obj->package.count; i++) {
790 o = (union acpi_object *)&obj->package.elements[i];
791 if (o->type != ACPI_TYPE_INTEGER) {
792 printk(KERN_ERR PREFIX "Invalid data\n");
795 value = (u32) o->integer.value;
796 /* Skip duplicate entries */
797 if (count > 2 && br->levels[count - 1] == value)
800 br->levels[count] = value;
802 if (br->levels[count] > max_level)
803 max_level = br->levels[count];
808 * some buggy BIOS don't export the levels
809 * when machine is on AC/Battery in _BCL package.
810 * In this case, the first two elements in _BCL packages
811 * are also supported brightness levels that OS should take care of.
813 for (i = 2; i < count; i++) {
814 if (br->levels[i] == br->levels[0])
816 if (br->levels[i] == br->levels[1])
820 if (level_ac_battery < 2) {
821 level_ac_battery = 2 - level_ac_battery;
822 br->flags._BCL_no_ac_battery_levels = 1;
823 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
824 br->levels[i] = br->levels[i - level_ac_battery];
825 count += level_ac_battery;
826 } else if (level_ac_battery > 2)
827 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
829 /* Check if the _BCL package is in a reversed order */
830 if (max_level == br->levels[2]) {
831 br->flags._BCL_reversed = 1;
832 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
833 acpi_video_cmp_level, NULL);
834 } else if (max_level != br->levels[count - 1])
836 "Found unordered _BCL package"));
839 device->brightness = br;
841 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
842 br->curr = level = max_level;
844 if (!device->cap._BQC)
847 result = acpi_video_device_lcd_get_level_current(device,
850 goto out_free_levels;
852 result = acpi_video_bqc_quirk(device, max_level, level_old);
854 goto out_free_levels;
856 * cap._BQC may get cleared due to _BQC is found to be broken
857 * in acpi_video_bqc_quirk, so check again here.
859 if (!device->cap._BQC)
862 level = acpi_video_bqc_value_to_level(device, level_old);
864 * On some buggy laptops, _BQC returns an uninitialized
865 * value when invoked for the first time, i.e.
866 * level_old is invalid (no matter whether it's a level
867 * or an index). Set the backlight to max_level in this case.
869 for (i = 2; i < br->count; i++)
870 if (level == br->levels[i])
872 if (i == br->count || !level)
876 result = acpi_video_device_lcd_set_level(device, level);
878 goto out_free_levels;
880 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
881 "found %d brightness levels\n", count - 2));
890 device->brightness = NULL;
897 * device : video output device (LCD, CRT, ..)
902 * Find out all required AML methods defined under the output
906 static void acpi_video_device_find_cap(struct acpi_video_device *device)
908 if (acpi_has_method(device->dev->handle, "_ADR"))
909 device->cap._ADR = 1;
910 if (acpi_has_method(device->dev->handle, "_BCL"))
911 device->cap._BCL = 1;
912 if (acpi_has_method(device->dev->handle, "_BCM"))
913 device->cap._BCM = 1;
914 if (acpi_has_method(device->dev->handle, "_BQC")) {
915 device->cap._BQC = 1;
916 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
917 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
918 device->cap._BCQ = 1;
921 if (acpi_has_method(device->dev->handle, "_DDC"))
922 device->cap._DDC = 1;
927 * device : video output device (VGA)
932 * Find out all required AML methods defined under the video bus device.
935 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
937 if (acpi_has_method(video->device->handle, "_DOS"))
939 if (acpi_has_method(video->device->handle, "_DOD"))
941 if (acpi_has_method(video->device->handle, "_ROM"))
943 if (acpi_has_method(video->device->handle, "_GPD"))
945 if (acpi_has_method(video->device->handle, "_SPD"))
947 if (acpi_has_method(video->device->handle, "_VPO"))
952 * Check whether the video bus device has required AML method to
953 * support the desired features
956 static int acpi_video_bus_check(struct acpi_video_bus *video)
958 acpi_status status = -ENOENT;
964 dev = acpi_get_pci_dev(video->device->handle);
970 * Since there is no HID, CID and so on for VGA driver, we have
971 * to check well known required nodes.
974 /* Does this device support video switching? */
975 if (video->cap._DOS || video->cap._DOD) {
976 if (!video->cap._DOS) {
977 printk(KERN_WARNING FW_BUG
978 "ACPI(%s) defines _DOD but not _DOS\n",
979 acpi_device_bid(video->device));
981 video->flags.multihead = 1;
985 /* Does this device support retrieving a video ROM? */
986 if (video->cap._ROM) {
987 video->flags.rom = 1;
991 /* Does this device support configuring which video device to POST? */
992 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
993 video->flags.post = 1;
1001 * --------------------------------------------------------------------------
1003 * --------------------------------------------------------------------------
1006 /* device interface */
1007 static struct acpi_video_device_attrib *
1008 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1010 struct acpi_video_enumerated_device *ids;
1013 for (i = 0; i < video->attached_count; i++) {
1014 ids = &video->attached_array[i];
1015 if ((ids->value.int_val & 0xffff) == device_id)
1016 return &ids->value.attrib;
1023 acpi_video_get_device_type(struct acpi_video_bus *video,
1024 unsigned long device_id)
1026 struct acpi_video_enumerated_device *ids;
1029 for (i = 0; i < video->attached_count; i++) {
1030 ids = &video->attached_array[i];
1031 if ((ids->value.int_val & 0xffff) == device_id)
1032 return ids->value.int_val;
1039 acpi_video_bus_get_one_device(struct acpi_device *device,
1040 struct acpi_video_bus *video)
1042 unsigned long long device_id;
1043 int status, device_type;
1044 struct acpi_video_device *data;
1045 struct acpi_video_device_attrib *attribute;
1048 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1049 /* Some device omits _ADR, we skip them instead of fail */
1050 if (ACPI_FAILURE(status))
1053 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1057 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1058 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1059 device->driver_data = data;
1061 data->device_id = device_id;
1062 data->video = video;
1064 INIT_DELAYED_WORK(&data->switch_brightness_work,
1065 acpi_video_switch_brightness);
1067 attribute = acpi_video_get_device_attr(video, device_id);
1069 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1070 switch (attribute->display_type) {
1071 case ACPI_VIDEO_DISPLAY_CRT:
1072 data->flags.crt = 1;
1074 case ACPI_VIDEO_DISPLAY_TV:
1075 data->flags.tvout = 1;
1077 case ACPI_VIDEO_DISPLAY_DVI:
1078 data->flags.dvi = 1;
1080 case ACPI_VIDEO_DISPLAY_LCD:
1081 data->flags.lcd = 1;
1084 data->flags.unknown = 1;
1087 if (attribute->bios_can_detect)
1088 data->flags.bios = 1;
1090 /* Check for legacy IDs */
1091 device_type = acpi_video_get_device_type(video, device_id);
1092 /* Ignore bits 16 and 18-20 */
1093 switch (device_type & 0xffe2ffff) {
1094 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1095 data->flags.crt = 1;
1097 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1098 data->flags.lcd = 1;
1100 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1101 data->flags.tvout = 1;
1104 data->flags.unknown = 1;
1108 acpi_video_device_bind(video, data);
1109 acpi_video_device_find_cap(data);
1111 mutex_lock(&video->device_list_lock);
1112 list_add_tail(&data->entry, &video->video_device_list);
1113 mutex_unlock(&video->device_list_lock);
1120 * video : video bus device
1125 * Enumerate the video device list of the video bus,
1126 * bind the ids with the corresponding video devices
1127 * under the video bus.
1130 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1132 struct acpi_video_device *dev;
1134 mutex_lock(&video->device_list_lock);
1136 list_for_each_entry(dev, &video->video_device_list, entry)
1137 acpi_video_device_bind(video, dev);
1139 mutex_unlock(&video->device_list_lock);
1144 * video : video bus device
1145 * device : video output device under the video
1151 * Bind the ids with the corresponding video devices
1152 * under the video bus.
1156 acpi_video_device_bind(struct acpi_video_bus *video,
1157 struct acpi_video_device *device)
1159 struct acpi_video_enumerated_device *ids;
1162 for (i = 0; i < video->attached_count; i++) {
1163 ids = &video->attached_array[i];
1164 if (device->device_id == (ids->value.int_val & 0xffff)) {
1165 ids->bind_info = device;
1166 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1171 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1173 struct acpi_video_bus *video = device->video;
1177 * If we have a broken _DOD or we have more than 8 output devices
1178 * under the graphics controller node that we can't proper deal with
1179 * in the operation region code currently, no need to test.
1181 if (!video->attached_count || video->child_count > 8)
1184 for (i = 0; i < video->attached_count; i++) {
1185 if ((video->attached_array[i].value.int_val & 0xfff) ==
1186 (device->device_id & 0xfff))
1195 * video : video bus device
1200 * Call _DOD to enumerate all devices attached to display adapter
1204 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1209 struct acpi_video_enumerated_device *active_list;
1210 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1211 union acpi_object *dod = NULL;
1212 union acpi_object *obj;
1214 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1215 if (!ACPI_SUCCESS(status)) {
1216 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1220 dod = buffer.pointer;
1221 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1222 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1227 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1228 dod->package.count));
1230 active_list = kcalloc(1 + dod->package.count,
1231 sizeof(struct acpi_video_enumerated_device),
1239 for (i = 0; i < dod->package.count; i++) {
1240 obj = &dod->package.elements[i];
1242 if (obj->type != ACPI_TYPE_INTEGER) {
1243 printk(KERN_ERR PREFIX
1244 "Invalid _DOD data in element %d\n", i);
1248 active_list[count].value.int_val = obj->integer.value;
1249 active_list[count].bind_info = NULL;
1250 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1251 (int)obj->integer.value));
1255 kfree(video->attached_array);
1257 video->attached_array = active_list;
1258 video->attached_count = count;
1261 kfree(buffer.pointer);
1266 acpi_video_get_next_level(struct acpi_video_device *device,
1267 u32 level_current, u32 event)
1269 int min, max, min_above, max_below, i, l, delta = 255;
1270 max = max_below = 0;
1271 min = min_above = 255;
1272 /* Find closest level to level_current */
1273 for (i = 2; i < device->brightness->count; i++) {
1274 l = device->brightness->levels[i];
1275 if (abs(l - level_current) < abs(delta)) {
1276 delta = l - level_current;
1281 /* Ajust level_current to closest available level */
1282 level_current += delta;
1283 for (i = 2; i < device->brightness->count; i++) {
1284 l = device->brightness->levels[i];
1289 if (l < min_above && l > level_current)
1291 if (l > max_below && l < level_current)
1296 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1297 return (level_current < max) ? min_above : min;
1298 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1299 return (level_current < max) ? min_above : max;
1300 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1301 return (level_current > min) ? max_below : min;
1302 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1303 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1306 return level_current;
1311 acpi_video_switch_brightness(struct work_struct *work)
1313 struct acpi_video_device *device = container_of(to_delayed_work(work),
1314 struct acpi_video_device, switch_brightness_work);
1315 unsigned long long level_current, level_next;
1316 int event = device->switch_brightness_event;
1317 int result = -EINVAL;
1319 /* no warning message if acpi_backlight=vendor or a quirk is used */
1320 if (!device->backlight)
1323 if (!device->brightness)
1326 result = acpi_video_device_lcd_get_level_current(device,
1332 level_next = acpi_video_get_next_level(device, level_current, event);
1334 result = acpi_video_device_lcd_set_level(device, level_next);
1337 backlight_force_update(device->backlight,
1338 BACKLIGHT_UPDATE_HOTKEY);
1342 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1345 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1348 struct acpi_video_bus *video;
1349 struct acpi_video_device *video_device;
1350 union acpi_object *buffer = NULL;
1354 if (!device || !acpi_driver_data(device))
1357 video = acpi_driver_data(device);
1359 for (i = 0; i < video->attached_count; i++) {
1360 video_device = video->attached_array[i].bind_info;
1366 if (!video_device->cap._DDC)
1371 case ACPI_VIDEO_DISPLAY_CRT:
1372 if (!video_device->flags.crt)
1375 case ACPI_VIDEO_DISPLAY_TV:
1376 if (!video_device->flags.tvout)
1379 case ACPI_VIDEO_DISPLAY_DVI:
1380 if (!video_device->flags.dvi)
1383 case ACPI_VIDEO_DISPLAY_LCD:
1384 if (!video_device->flags.lcd)
1388 } else if (video_device->device_id != device_id) {
1392 status = acpi_video_device_EDID(video_device, &buffer, length);
1394 if (ACPI_FAILURE(status) || !buffer ||
1395 buffer->type != ACPI_TYPE_BUFFER) {
1397 status = acpi_video_device_EDID(video_device, &buffer,
1399 if (ACPI_FAILURE(status) || !buffer ||
1400 buffer->type != ACPI_TYPE_BUFFER) {
1405 *edid = buffer->buffer.pointer;
1411 EXPORT_SYMBOL(acpi_video_get_edid);
1414 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1415 struct acpi_device *device)
1418 struct acpi_device *dev;
1421 * There are systems where video module known to work fine regardless
1422 * of broken _DOD and ignoring returned value here doesn't cause
1425 acpi_video_device_enumerate(video);
1427 list_for_each_entry(dev, &device->children, node) {
1429 status = acpi_video_bus_get_one_device(dev, video);
1431 dev_err(&dev->dev, "Can't attach device\n");
1434 video->child_count++;
1439 /* acpi_video interface */
1442 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1443 * preform any automatic brightness change on receiving a notification.
1445 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1447 return acpi_video_bus_DOS(video, 0,
1448 acpi_osi_is_win8() ? 1 : 0);
1451 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1453 return acpi_video_bus_DOS(video, 0,
1454 acpi_osi_is_win8() ? 0 : 1);
1457 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1459 struct acpi_video_bus *video = acpi_driver_data(device);
1460 struct input_dev *input;
1463 if (!video || !video->input)
1466 input = video->input;
1469 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1470 * most likely via hotkey. */
1471 keycode = KEY_SWITCHVIDEOMODE;
1474 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1476 acpi_video_device_enumerate(video);
1477 acpi_video_device_rebind(video);
1478 keycode = KEY_SWITCHVIDEOMODE;
1481 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1482 keycode = KEY_SWITCHVIDEOMODE;
1484 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1485 keycode = KEY_VIDEO_NEXT;
1487 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1488 keycode = KEY_VIDEO_PREV;
1492 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1493 "Unsupported event [0x%x]\n", event));
1497 if (acpi_notifier_call_chain(device, event, 0))
1498 /* Something vetoed the keypress. */
1502 input_report_key(input, keycode, 1);
1504 input_report_key(input, keycode, 0);
1511 static void brightness_switch_event(struct acpi_video_device *video_device,
1514 if (!brightness_switch_enabled)
1517 video_device->switch_brightness_event = event;
1518 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1521 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1523 struct acpi_video_device *video_device = data;
1524 struct acpi_device *device = NULL;
1525 struct acpi_video_bus *bus;
1526 struct input_dev *input;
1532 device = video_device->dev;
1533 bus = video_device->video;
1537 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1538 brightness_switch_event(video_device, event);
1539 keycode = KEY_BRIGHTNESS_CYCLE;
1541 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1542 brightness_switch_event(video_device, event);
1543 keycode = KEY_BRIGHTNESSUP;
1545 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1546 brightness_switch_event(video_device, event);
1547 keycode = KEY_BRIGHTNESSDOWN;
1549 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1550 brightness_switch_event(video_device, event);
1551 keycode = KEY_BRIGHTNESS_ZERO;
1553 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1554 brightness_switch_event(video_device, event);
1555 keycode = KEY_DISPLAY_OFF;
1558 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1559 "Unsupported event [0x%x]\n", event));
1563 acpi_notifier_call_chain(device, event, 0);
1566 input_report_key(input, keycode, 1);
1568 input_report_key(input, keycode, 0);
1575 static int acpi_video_resume(struct notifier_block *nb,
1576 unsigned long val, void *ign)
1578 struct acpi_video_bus *video;
1579 struct acpi_video_device *video_device;
1583 case PM_HIBERNATION_PREPARE:
1584 case PM_SUSPEND_PREPARE:
1585 case PM_RESTORE_PREPARE:
1589 video = container_of(nb, struct acpi_video_bus, pm_nb);
1591 dev_info(&video->device->dev, "Restoring backlight state\n");
1593 for (i = 0; i < video->attached_count; i++) {
1594 video_device = video->attached_array[i].bind_info;
1595 if (video_device && video_device->brightness)
1596 acpi_video_device_lcd_set_level(video_device,
1597 video_device->brightness->curr);
1604 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1605 void **return_value)
1607 struct acpi_device *device = context;
1608 struct acpi_device *sibling;
1611 if (handle == device->handle)
1612 return AE_CTRL_TERMINATE;
1614 result = acpi_bus_get_device(handle, &sibling);
1618 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1619 return AE_ALREADY_EXISTS;
1624 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1626 struct backlight_properties props;
1627 struct pci_dev *pdev;
1628 acpi_handle acpi_parent;
1629 struct device *parent = NULL;
1634 result = acpi_video_init_brightness(device);
1638 if (disable_backlight_sysfs_if > 0)
1641 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1646 acpi_get_parent(device->dev->handle, &acpi_parent);
1648 pdev = acpi_get_pci_dev(acpi_parent);
1650 parent = &pdev->dev;
1654 memset(&props, 0, sizeof(struct backlight_properties));
1655 props.type = BACKLIGHT_FIRMWARE;
1656 props.max_brightness = device->brightness->count - 3;
1657 device->backlight = backlight_device_register(name,
1660 &acpi_backlight_ops,
1663 if (IS_ERR(device->backlight)) {
1664 device->backlight = NULL;
1669 * Save current brightness level in case we have to restore it
1670 * before acpi_video_device_lcd_set_level() is called next time.
1672 device->backlight->props.brightness =
1673 acpi_video_get_brightness(device->backlight);
1675 device->cooling_dev = thermal_cooling_device_register("LCD",
1676 device->dev, &video_cooling_ops);
1677 if (IS_ERR(device->cooling_dev)) {
1679 * Set cooling_dev to NULL so we don't crash trying to free it.
1680 * Also, why the hell we are returning early and not attempt to
1681 * register video output if cooling device registration failed?
1684 device->cooling_dev = NULL;
1688 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1689 device->cooling_dev->id);
1690 result = sysfs_create_link(&device->dev->dev.kobj,
1691 &device->cooling_dev->device.kobj,
1694 printk(KERN_ERR PREFIX "Create sysfs link\n");
1695 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1696 &device->dev->dev.kobj, "device");
1698 printk(KERN_ERR PREFIX "Create sysfs link\n");
1701 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1703 struct acpi_video_device *dev;
1704 union acpi_object *levels;
1706 mutex_lock(&video->device_list_lock);
1707 list_for_each_entry(dev, &video->video_device_list, entry) {
1708 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1711 mutex_unlock(&video->device_list_lock);
1714 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1717 * Do not create backlight device for video output
1718 * device that is not in the enumerated list.
1720 if (!acpi_video_device_in_dod(dev)) {
1721 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1726 return dev->flags.lcd;
1730 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1732 struct acpi_video_device *dev;
1734 if (video->backlight_registered)
1737 acpi_video_run_bcl_for_osi(video);
1739 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1742 mutex_lock(&video->device_list_lock);
1743 list_for_each_entry(dev, &video->video_device_list, entry) {
1744 if (acpi_video_should_register_backlight(dev))
1745 acpi_video_dev_register_backlight(dev);
1747 mutex_unlock(&video->device_list_lock);
1749 video->backlight_registered = true;
1751 video->pm_nb.notifier_call = acpi_video_resume;
1752 video->pm_nb.priority = 0;
1753 return register_pm_notifier(&video->pm_nb);
1756 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1758 if (device->backlight) {
1759 backlight_device_unregister(device->backlight);
1760 device->backlight = NULL;
1762 if (device->brightness) {
1763 kfree(device->brightness->levels);
1764 kfree(device->brightness);
1765 device->brightness = NULL;
1767 if (device->cooling_dev) {
1768 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1769 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1770 thermal_cooling_device_unregister(device->cooling_dev);
1771 device->cooling_dev = NULL;
1775 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1777 struct acpi_video_device *dev;
1780 if (!video->backlight_registered)
1783 error = unregister_pm_notifier(&video->pm_nb);
1785 mutex_lock(&video->device_list_lock);
1786 list_for_each_entry(dev, &video->video_device_list, entry)
1787 acpi_video_dev_unregister_backlight(dev);
1788 mutex_unlock(&video->device_list_lock);
1790 video->backlight_registered = false;
1795 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1798 struct acpi_device *adev = device->dev;
1800 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1801 acpi_video_device_notify, device);
1802 if (ACPI_FAILURE(status))
1803 dev_err(&adev->dev, "Error installing notify handler\n");
1805 device->flags.notify = 1;
1808 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1810 struct input_dev *input;
1811 struct acpi_video_device *dev;
1814 video->input = input = input_allocate_device();
1820 error = acpi_video_bus_start_devices(video);
1822 goto err_free_input;
1824 snprintf(video->phys, sizeof(video->phys),
1825 "%s/video/input0", acpi_device_hid(video->device));
1827 input->name = acpi_device_name(video->device);
1828 input->phys = video->phys;
1829 input->id.bustype = BUS_HOST;
1830 input->id.product = 0x06;
1831 input->dev.parent = &video->device->dev;
1832 input->evbit[0] = BIT(EV_KEY);
1833 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1834 set_bit(KEY_VIDEO_NEXT, input->keybit);
1835 set_bit(KEY_VIDEO_PREV, input->keybit);
1836 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1837 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1838 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1839 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1840 set_bit(KEY_DISPLAY_OFF, input->keybit);
1842 error = input_register_device(input);
1846 mutex_lock(&video->device_list_lock);
1847 list_for_each_entry(dev, &video->video_device_list, entry)
1848 acpi_video_dev_add_notify_handler(dev);
1849 mutex_unlock(&video->device_list_lock);
1854 acpi_video_bus_stop_devices(video);
1856 input_free_device(input);
1857 video->input = NULL;
1862 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1864 if (dev->flags.notify) {
1865 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1866 acpi_video_device_notify);
1867 dev->flags.notify = 0;
1871 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1873 struct acpi_video_device *dev;
1875 mutex_lock(&video->device_list_lock);
1876 list_for_each_entry(dev, &video->video_device_list, entry)
1877 acpi_video_dev_remove_notify_handler(dev);
1878 mutex_unlock(&video->device_list_lock);
1880 acpi_video_bus_stop_devices(video);
1881 input_unregister_device(video->input);
1882 video->input = NULL;
1885 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1887 struct acpi_video_device *dev, *next;
1889 mutex_lock(&video->device_list_lock);
1890 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1891 list_del(&dev->entry);
1894 mutex_unlock(&video->device_list_lock);
1899 static int instance;
1901 static int acpi_video_bus_add(struct acpi_device *device)
1903 struct acpi_video_bus *video;
1907 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1908 device->parent->handle, 1,
1909 acpi_video_bus_match, NULL,
1911 if (status == AE_ALREADY_EXISTS) {
1912 printk(KERN_WARNING FW_BUG
1913 "Duplicate ACPI video bus devices for the"
1914 " same VGA controller, please try module "
1915 "parameter \"video.allow_duplicates=1\""
1916 "if the current driver doesn't work.\n");
1917 if (!allow_duplicates)
1921 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1925 /* a hack to fix the duplicate name "VID" problem on T61 */
1926 if (!strcmp(device->pnp.bus_id, "VID")) {
1928 device->pnp.bus_id[3] = '0' + instance;
1931 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1932 if (!strcmp(device->pnp.bus_id, "VGA")) {
1934 device->pnp.bus_id[3] = '0' + instance;
1938 video->device = device;
1939 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1940 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1941 device->driver_data = video;
1943 acpi_video_bus_find_cap(video);
1944 error = acpi_video_bus_check(video);
1946 goto err_free_video;
1948 mutex_init(&video->device_list_lock);
1949 INIT_LIST_HEAD(&video->video_device_list);
1951 error = acpi_video_bus_get_devices(video, device);
1955 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1956 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1957 video->flags.multihead ? "yes" : "no",
1958 video->flags.rom ? "yes" : "no",
1959 video->flags.post ? "yes" : "no");
1960 mutex_lock(&video_list_lock);
1961 list_add_tail(&video->entry, &video_bus_head);
1962 mutex_unlock(&video_list_lock);
1964 acpi_video_bus_register_backlight(video);
1965 acpi_video_bus_add_notify_handler(video);
1970 acpi_video_bus_put_devices(video);
1971 kfree(video->attached_array);
1974 device->driver_data = NULL;
1979 static int acpi_video_bus_remove(struct acpi_device *device)
1981 struct acpi_video_bus *video = NULL;
1984 if (!device || !acpi_driver_data(device))
1987 video = acpi_driver_data(device);
1989 acpi_video_bus_remove_notify_handler(video);
1990 acpi_video_bus_unregister_backlight(video);
1991 acpi_video_bus_put_devices(video);
1993 mutex_lock(&video_list_lock);
1994 list_del(&video->entry);
1995 mutex_unlock(&video_list_lock);
1997 kfree(video->attached_array);
2003 static int __init is_i740(struct pci_dev *dev)
2005 if (dev->device == 0x00D1)
2007 if (dev->device == 0x7000)
2012 static int __init intel_opregion_present(void)
2015 struct pci_dev *dev = NULL;
2018 for_each_pci_dev(dev) {
2019 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2021 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2023 /* We don't want to poke around undefined i740 registers */
2026 pci_read_config_dword(dev, 0xfc, &address);
2034 int acpi_video_register(void)
2038 mutex_lock(®ister_count_mutex);
2039 if (register_count) {
2041 * if the function of acpi_video_register is already called,
2042 * don't register the acpi_vide_bus again and return no error.
2047 mutex_init(&video_list_lock);
2048 INIT_LIST_HEAD(&video_bus_head);
2050 dmi_check_system(video_dmi_table);
2052 ret = acpi_bus_register_driver(&acpi_video_bus);
2057 * When the acpi_video_bus is loaded successfully, increase
2058 * the counter reference.
2063 mutex_unlock(®ister_count_mutex);
2066 EXPORT_SYMBOL(acpi_video_register);
2068 void acpi_video_unregister(void)
2070 mutex_lock(®ister_count_mutex);
2071 if (register_count) {
2072 acpi_bus_unregister_driver(&acpi_video_bus);
2075 mutex_unlock(®ister_count_mutex);
2077 EXPORT_SYMBOL(acpi_video_unregister);
2079 void acpi_video_unregister_backlight(void)
2081 struct acpi_video_bus *video;
2083 mutex_lock(®ister_count_mutex);
2084 if (register_count) {
2085 mutex_lock(&video_list_lock);
2086 list_for_each_entry(video, &video_bus_head, entry)
2087 acpi_video_bus_unregister_backlight(video);
2088 mutex_unlock(&video_list_lock);
2090 mutex_unlock(®ister_count_mutex);
2094 * This is kind of nasty. Hardware using Intel chipsets may require
2095 * the video opregion code to be run first in order to initialise
2096 * state before any ACPI video calls are made. To handle this we defer
2097 * registration of the video class until the opregion code has run.
2100 static int __init acpi_video_init(void)
2103 * Let the module load even if ACPI is disabled (e.g. due to
2104 * a broken BIOS) so that i915.ko can still be loaded on such
2105 * old systems without an AcpiOpRegion.
2107 * acpi_video_register() will report -ENODEV later as well due
2108 * to acpi_disabled when i915.ko tries to register itself afterwards.
2113 if (intel_opregion_present())
2116 return acpi_video_register();
2119 static void __exit acpi_video_exit(void)
2121 acpi_video_detect_exit();
2122 acpi_video_unregister();
2127 module_init(acpi_video_init);
2128 module_exit(acpi_video_exit);