d0937ab3fb6d3bab5e56bd6b6d667ab1c0a6bb3f
[linux-3.10.git] / drivers / acpi / video.c
1 /*
2  *  video.c - ACPI Video Driver ($Revision:$)
3  *
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>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
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.
14  *
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.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
50 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
51 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
52 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
53 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
56
57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
62
63 #define MAX_NAME_LEN    20
64
65 #define _COMPONENT              ACPI_VIDEO_COMPONENT
66 ACPI_MODULE_NAME("video");
67
68 MODULE_AUTHOR("Bruno Ducrot");
69 MODULE_DESCRIPTION("ACPI Video Driver");
70 MODULE_LICENSE("GPL");
71
72 static bool brightness_switch_enabled = 1;
73 module_param(brightness_switch_enabled, bool, 0644);
74
75 /*
76  * By default, we don't allow duplicate ACPI video bus devices
77  * under the same VGA controller
78  */
79 static bool allow_duplicates;
80 module_param(allow_duplicates, bool, 0644);
81
82 /*
83  * Some BIOSes claim they use minimum backlight at boot,
84  * and this may bring dimming screen after boot
85  */
86 static bool use_bios_initial_backlight = 1;
87 module_param(use_bios_initial_backlight, bool, 0644);
88
89 static int register_count = 0;
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
94 static const struct acpi_device_id video_device_ids[] = {
95         {ACPI_VIDEO_HID, 0},
96         {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100 static struct acpi_driver acpi_video_bus = {
101         .name = "video",
102         .class = ACPI_VIDEO_CLASS,
103         .ids = video_device_ids,
104         .ops = {
105                 .add = acpi_video_bus_add,
106                 .remove = acpi_video_bus_remove,
107                 .notify = acpi_video_bus_notify,
108                 },
109 };
110
111 struct acpi_video_bus_flags {
112         u8 multihead:1;         /* can switch video heads */
113         u8 rom:1;               /* can retrieve a video rom */
114         u8 post:1;              /* can configure the head to */
115         u8 reserved:5;
116 };
117
118 struct acpi_video_bus_cap {
119         u8 _DOS:1;              /*Enable/Disable output switching */
120         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
121         u8 _ROM:1;              /*Get ROM Data */
122         u8 _GPD:1;              /*Get POST Device */
123         u8 _SPD:1;              /*Set POST Device */
124         u8 _VPO:1;              /*Video POST Options */
125         u8 reserved:2;
126 };
127
128 struct acpi_video_device_attrib {
129         u32 display_index:4;    /* A zero-based instance of the Display */
130         u32 display_port_attachment:4;  /*This field differentiates the display type */
131         u32 display_type:4;     /*Describe the specific type in use */
132         u32 vendor_specific:4;  /*Chipset Vendor Specific */
133         u32 bios_can_detect:1;  /*BIOS can detect the device */
134         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
135                                    the VGA device. */
136         u32 pipe_id:3;          /*For VGA multiple-head devices. */
137         u32 reserved:10;        /*Must be 0 */
138         u32 device_id_scheme:1; /*Device ID Scheme */
139 };
140
141 struct acpi_video_enumerated_device {
142         union {
143                 u32 int_val;
144                 struct acpi_video_device_attrib attrib;
145         } value;
146         struct acpi_video_device *bind_info;
147 };
148
149 struct acpi_video_bus {
150         struct acpi_device *device;
151         u8 dos_setting;
152         struct acpi_video_enumerated_device *attached_array;
153         u8 attached_count;
154         struct acpi_video_bus_cap cap;
155         struct acpi_video_bus_flags flags;
156         struct list_head video_device_list;
157         struct mutex device_list_lock;  /* protects video_device_list */
158         struct input_dev *input;
159         char phys[32];  /* for input device */
160         struct notifier_block pm_nb;
161 };
162
163 struct acpi_video_device_flags {
164         u8 crt:1;
165         u8 lcd:1;
166         u8 tvout:1;
167         u8 dvi:1;
168         u8 bios:1;
169         u8 unknown:1;
170         u8 notify:1;
171         u8 reserved:1;
172 };
173
174 struct acpi_video_device_cap {
175         u8 _ADR:1;              /*Return the unique ID */
176         u8 _BCL:1;              /*Query list of brightness control levels supported */
177         u8 _BCM:1;              /*Set the brightness level */
178         u8 _BQC:1;              /* Get current brightness level */
179         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
180         u8 _DDC:1;              /*Return the EDID for this device */
181 };
182
183 struct acpi_video_brightness_flags {
184         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
185         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
186         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
187         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
188         u8 _BQC_use_index:1;            /* _BQC returns an index value */
189 };
190
191 struct acpi_video_device_brightness {
192         int curr;
193         int count;
194         int *levels;
195         struct acpi_video_brightness_flags flags;
196 };
197
198 struct acpi_video_device {
199         unsigned long device_id;
200         struct acpi_video_device_flags flags;
201         struct acpi_video_device_cap cap;
202         struct list_head entry;
203         struct acpi_video_bus *video;
204         struct acpi_device *dev;
205         struct acpi_video_device_brightness *brightness;
206         struct backlight_device *backlight;
207         struct thermal_cooling_device *cooling_dev;
208 };
209
210 static const char device_decode[][30] = {
211         "motherboard VGA device",
212         "PCI VGA device",
213         "AGP VGA device",
214         "UNKNOWN",
215 };
216
217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
219 static void acpi_video_device_bind(struct acpi_video_bus *video,
220                                    struct acpi_video_device *device);
221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
223                         int level);
224 static int acpi_video_device_lcd_get_level_current(
225                         struct acpi_video_device *device,
226                         unsigned long long *level, bool raw);
227 static int acpi_video_get_next_level(struct acpi_video_device *device,
228                                      u32 level_current, u32 event);
229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
230                                          int event);
231
232 /*backlight device sysfs support*/
233 static int acpi_video_get_brightness(struct backlight_device *bd)
234 {
235         unsigned long long cur_level;
236         int i;
237         struct acpi_video_device *vd =
238                 (struct acpi_video_device *)bl_get_data(bd);
239
240         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
241                 return -EINVAL;
242         for (i = 2; i < vd->brightness->count; i++) {
243                 if (vd->brightness->levels[i] == cur_level)
244                         /* The first two entries are special - see page 575
245                            of the ACPI spec 3.0 */
246                         return i-2;
247         }
248         return 0;
249 }
250
251 static int acpi_video_set_brightness(struct backlight_device *bd)
252 {
253         int request_level = bd->props.brightness + 2;
254         struct acpi_video_device *vd =
255                 (struct acpi_video_device *)bl_get_data(bd);
256
257         return acpi_video_device_lcd_set_level(vd,
258                                 vd->brightness->levels[request_level]);
259 }
260
261 static const struct backlight_ops acpi_backlight_ops = {
262         .get_brightness = acpi_video_get_brightness,
263         .update_status  = acpi_video_set_brightness,
264 };
265
266 /* thermal cooling device callbacks */
267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
268                                long *state)
269 {
270         struct acpi_device *device = cooling_dev->devdata;
271         struct acpi_video_device *video = acpi_driver_data(device);
272
273         *state = video->brightness->count - 3;
274         return 0;
275 }
276
277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
278                                long *state)
279 {
280         struct acpi_device *device = cooling_dev->devdata;
281         struct acpi_video_device *video = acpi_driver_data(device);
282         unsigned long long level;
283         int offset;
284
285         if (acpi_video_device_lcd_get_level_current(video, &level, false))
286                 return -EINVAL;
287         for (offset = 2; offset < video->brightness->count; offset++)
288                 if (level == video->brightness->levels[offset]) {
289                         *state = video->brightness->count - offset - 1;
290                         return 0;
291                 }
292
293         return -EINVAL;
294 }
295
296 static int
297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
298 {
299         struct acpi_device *device = cooling_dev->devdata;
300         struct acpi_video_device *video = acpi_driver_data(device);
301         int level;
302
303         if ( state >= video->brightness->count - 2)
304                 return -EINVAL;
305
306         state = video->brightness->count - state;
307         level = video->brightness->levels[state -1];
308         return acpi_video_device_lcd_set_level(video, level);
309 }
310
311 static const struct thermal_cooling_device_ops video_cooling_ops = {
312         .get_max_state = video_get_max_state,
313         .get_cur_state = video_get_cur_state,
314         .set_cur_state = video_set_cur_state,
315 };
316
317 /* --------------------------------------------------------------------------
318                                Video Management
319    -------------------------------------------------------------------------- */
320
321 static int
322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
323                                    union acpi_object **levels)
324 {
325         int status;
326         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
327         union acpi_object *obj;
328
329
330         *levels = NULL;
331
332         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
333         if (!ACPI_SUCCESS(status))
334                 return status;
335         obj = (union acpi_object *)buffer.pointer;
336         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
337                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
338                 status = -EFAULT;
339                 goto err;
340         }
341
342         *levels = obj;
343
344         return 0;
345
346       err:
347         kfree(buffer.pointer);
348
349         return status;
350 }
351
352 static int
353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
354 {
355         int status;
356         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
357         struct acpi_object_list args = { 1, &arg0 };
358         int state;
359
360         arg0.integer.value = level;
361
362         status = acpi_evaluate_object(device->dev->handle, "_BCM",
363                                       &args, NULL);
364         if (ACPI_FAILURE(status)) {
365                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
366                 return -EIO;
367         }
368
369         device->brightness->curr = level;
370         for (state = 2; state < device->brightness->count; state++)
371                 if (level == device->brightness->levels[state]) {
372                         if (device->backlight)
373                                 device->backlight->props.brightness = state - 2;
374                         return 0;
375                 }
376
377         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
378         return -EINVAL;
379 }
380
381 /*
382  * For some buggy _BQC methods, we need to add a constant value to
383  * the _BQC return value to get the actual current brightness level
384  */
385
386 static int bqc_offset_aml_bug_workaround;
387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
388 {
389         bqc_offset_aml_bug_workaround = 9;
390         return 0;
391 }
392
393 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
394 {
395         use_bios_initial_backlight = 0;
396         return 0;
397 }
398
399 static struct dmi_system_id video_dmi_table[] __initdata = {
400         /*
401          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
402          */
403         {
404          .callback = video_set_bqc_offset,
405          .ident = "Acer Aspire 5720",
406          .matches = {
407                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
408                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
409                 },
410         },
411         {
412          .callback = video_set_bqc_offset,
413          .ident = "Acer Aspire 5710Z",
414          .matches = {
415                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
416                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
417                 },
418         },
419         {
420          .callback = video_set_bqc_offset,
421          .ident = "eMachines E510",
422          .matches = {
423                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
424                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
425                 },
426         },
427         {
428          .callback = video_set_bqc_offset,
429          .ident = "Acer Aspire 5315",
430          .matches = {
431                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
433                 },
434         },
435         {
436          .callback = video_set_bqc_offset,
437          .ident = "Acer Aspire 7720",
438          .matches = {
439                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
440                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
441                 },
442         },
443         {
444          .callback = video_ignore_initial_backlight,
445          .ident = "HP Folio 13-2000",
446          .matches = {
447                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
448                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
449                 },
450         },
451         {
452          .callback = video_ignore_initial_backlight,
453          .ident = "HP Pavilion dm4",
454          .matches = {
455                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
456                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
457                 },
458         },
459         {
460          .callback = video_ignore_initial_backlight,
461          .ident = "HP 1000 Notebook PC",
462          .matches = {
463                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
465                 },
466         },
467         {
468          .callback = video_ignore_initial_backlight,
469          .ident = "HP Pavilion m4",
470          .matches = {
471                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
472                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
473                 },
474         },
475         {}
476 };
477
478 static unsigned long long
479 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
480                               unsigned long long bqc_value)
481 {
482         unsigned long long level;
483
484         if (device->brightness->flags._BQC_use_index) {
485                 /*
486                  * _BQC returns an index that doesn't account for
487                  * the first 2 items with special meaning, so we need
488                  * to compensate for that by offsetting ourselves
489                  */
490                 if (device->brightness->flags._BCL_reversed)
491                         bqc_value = device->brightness->count - 3 - bqc_value;
492
493                 level = device->brightness->levels[bqc_value + 2];
494         } else {
495                 level = bqc_value;
496         }
497
498         level += bqc_offset_aml_bug_workaround;
499
500         return level;
501 }
502
503 static int
504 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
505                                         unsigned long long *level, bool raw)
506 {
507         acpi_status status = AE_OK;
508         int i;
509
510         if (device->cap._BQC || device->cap._BCQ) {
511                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
512
513                 status = acpi_evaluate_integer(device->dev->handle, buf,
514                                                 NULL, level);
515                 if (ACPI_SUCCESS(status)) {
516                         if (raw) {
517                                 /*
518                                  * Caller has indicated he wants the raw
519                                  * value returned by _BQC, so don't furtherly
520                                  * mess with the value.
521                                  */
522                                 return 0;
523                         }
524
525                         *level = acpi_video_bqc_value_to_level(device, *level);
526
527                         for (i = 2; i < device->brightness->count; i++)
528                                 if (device->brightness->levels[i] == *level) {
529                                         device->brightness->curr = *level;
530                                         return 0;
531                         }
532                         /*
533                          * BQC returned an invalid level.
534                          * Stop using it.
535                          */
536                         ACPI_WARNING((AE_INFO,
537                                       "%s returned an invalid level",
538                                       buf));
539                         device->cap._BQC = device->cap._BCQ = 0;
540                 } else {
541                         /* Fixme:
542                          * should we return an error or ignore this failure?
543                          * dev->brightness->curr is a cached value which stores
544                          * the correct current backlight level in most cases.
545                          * ACPI video backlight still works w/ buggy _BQC.
546                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
547                          */
548                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
549                         device->cap._BQC = device->cap._BCQ = 0;
550                 }
551         }
552
553         *level = device->brightness->curr;
554         return 0;
555 }
556
557 static int
558 acpi_video_device_EDID(struct acpi_video_device *device,
559                        union acpi_object **edid, ssize_t length)
560 {
561         int status;
562         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
563         union acpi_object *obj;
564         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
565         struct acpi_object_list args = { 1, &arg0 };
566
567
568         *edid = NULL;
569
570         if (!device)
571                 return -ENODEV;
572         if (length == 128)
573                 arg0.integer.value = 1;
574         else if (length == 256)
575                 arg0.integer.value = 2;
576         else
577                 return -EINVAL;
578
579         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
580         if (ACPI_FAILURE(status))
581                 return -ENODEV;
582
583         obj = buffer.pointer;
584
585         if (obj && obj->type == ACPI_TYPE_BUFFER)
586                 *edid = obj;
587         else {
588                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
589                 status = -EFAULT;
590                 kfree(obj);
591         }
592
593         return status;
594 }
595
596 /* bus */
597
598 /*
599  *  Arg:
600  *      video           : video bus device pointer
601  *      bios_flag       : 
602  *              0.      The system BIOS should NOT automatically switch(toggle)
603  *                      the active display output.
604  *              1.      The system BIOS should automatically switch (toggle) the
605  *                      active display output. No switch event.
606  *              2.      The _DGS value should be locked.
607  *              3.      The system BIOS should not automatically switch (toggle) the
608  *                      active display output, but instead generate the display switch
609  *                      event notify code.
610  *      lcd_flag        :
611  *              0.      The system BIOS should automatically control the brightness level
612  *                      of the LCD when the power changes from AC to DC
613  *              1.      The system BIOS should NOT automatically control the brightness 
614  *                      level of the LCD when the power changes from AC to DC.
615  * Return Value:
616  *              -EINVAL wrong arg.
617  */
618
619 static int
620 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
621 {
622         acpi_status status;
623         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
624         struct acpi_object_list args = { 1, &arg0 };
625
626         if (!video->cap._DOS)
627                 return 0;
628
629         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
630                 return -EINVAL;
631         arg0.integer.value = (lcd_flag << 2) | bios_flag;
632         video->dos_setting = arg0.integer.value;
633         status = acpi_evaluate_object(video->device->handle, "_DOS",
634                 &args, NULL);
635         if (ACPI_FAILURE(status))
636                 return -EIO;
637
638         return 0;
639 }
640
641 /*
642  * Simple comparison function used to sort backlight levels.
643  */
644
645 static int
646 acpi_video_cmp_level(const void *a, const void *b)
647 {
648         return *(int *)a - *(int *)b;
649 }
650
651 /*
652  * Decides if _BQC/_BCQ for this system is usable
653  *
654  * We do this by changing the level first and then read out the current
655  * brightness level, if the value does not match, find out if it is using
656  * index. If not, clear the _BQC/_BCQ capability.
657  */
658 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
659                                 int max_level, int current_level)
660 {
661         struct acpi_video_device_brightness *br = device->brightness;
662         int result;
663         unsigned long long level;
664         int test_level;
665
666         /* don't mess with existing known broken systems */
667         if (bqc_offset_aml_bug_workaround)
668                 return 0;
669
670         /*
671          * Some systems always report current brightness level as maximum
672          * through _BQC, we need to test another value for them.
673          */
674         test_level = current_level == max_level ? br->levels[2] : max_level;
675
676         result = acpi_video_device_lcd_set_level(device, test_level);
677         if (result)
678                 return result;
679
680         result = acpi_video_device_lcd_get_level_current(device, &level, true);
681         if (result)
682                 return result;
683
684         if (level != test_level) {
685                 /* buggy _BQC found, need to find out if it uses index */
686                 if (level < br->count) {
687                         if (br->flags._BCL_reversed)
688                                 level = br->count - 3 - level;
689                         if (br->levels[level + 2] == test_level)
690                                 br->flags._BQC_use_index = 1;
691                 }
692
693                 if (!br->flags._BQC_use_index)
694                         device->cap._BQC = device->cap._BCQ = 0;
695         }
696
697         return 0;
698 }
699
700
701 /*
702  *  Arg:        
703  *      device  : video output device (LCD, CRT, ..)
704  *
705  *  Return Value:
706  *      Maximum brightness level
707  *
708  *  Allocate and initialize device->brightness.
709  */
710
711 static int
712 acpi_video_init_brightness(struct acpi_video_device *device)
713 {
714         union acpi_object *obj = NULL;
715         int i, max_level = 0, count = 0, level_ac_battery = 0;
716         unsigned long long level, level_old;
717         union acpi_object *o;
718         struct acpi_video_device_brightness *br = NULL;
719         int result = -EINVAL;
720
721         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
722                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
723                                                 "LCD brightness level\n"));
724                 goto out;
725         }
726
727         if (obj->package.count < 2)
728                 goto out;
729
730         br = kzalloc(sizeof(*br), GFP_KERNEL);
731         if (!br) {
732                 printk(KERN_ERR "can't allocate memory\n");
733                 result = -ENOMEM;
734                 goto out;
735         }
736
737         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
738                                 GFP_KERNEL);
739         if (!br->levels) {
740                 result = -ENOMEM;
741                 goto out_free;
742         }
743
744         for (i = 0; i < obj->package.count; i++) {
745                 o = (union acpi_object *)&obj->package.elements[i];
746                 if (o->type != ACPI_TYPE_INTEGER) {
747                         printk(KERN_ERR PREFIX "Invalid data\n");
748                         continue;
749                 }
750                 br->levels[count] = (u32) o->integer.value;
751
752                 if (br->levels[count] > max_level)
753                         max_level = br->levels[count];
754                 count++;
755         }
756
757         /*
758          * some buggy BIOS don't export the levels
759          * when machine is on AC/Battery in _BCL package.
760          * In this case, the first two elements in _BCL packages
761          * are also supported brightness levels that OS should take care of.
762          */
763         for (i = 2; i < count; i++) {
764                 if (br->levels[i] == br->levels[0])
765                         level_ac_battery++;
766                 if (br->levels[i] == br->levels[1])
767                         level_ac_battery++;
768         }
769
770         if (level_ac_battery < 2) {
771                 level_ac_battery = 2 - level_ac_battery;
772                 br->flags._BCL_no_ac_battery_levels = 1;
773                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
774                         br->levels[i] = br->levels[i - level_ac_battery];
775                 count += level_ac_battery;
776         } else if (level_ac_battery > 2)
777                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
778
779         /* Check if the _BCL package is in a reversed order */
780         if (max_level == br->levels[2]) {
781                 br->flags._BCL_reversed = 1;
782                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
783                         acpi_video_cmp_level, NULL);
784         } else if (max_level != br->levels[count - 1])
785                 ACPI_ERROR((AE_INFO,
786                             "Found unordered _BCL package"));
787
788         br->count = count;
789         device->brightness = br;
790
791         /* Check the input/output of _BQC/_BCL/_BCM */
792         if ((max_level < 100) && (max_level <= (count - 2)))
793                 br->flags._BCL_use_index = 1;
794
795         /*
796          * _BCM is always consistent with _BCL,
797          * at least for all the laptops we have ever seen.
798          */
799         br->flags._BCM_use_index = br->flags._BCL_use_index;
800
801         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
802         br->curr = level = max_level;
803
804         if (!device->cap._BQC)
805                 goto set_level;
806
807         result = acpi_video_device_lcd_get_level_current(device,
808                                                          &level_old, true);
809         if (result)
810                 goto out_free_levels;
811
812         result = acpi_video_bqc_quirk(device, max_level, level_old);
813         if (result)
814                 goto out_free_levels;
815         /*
816          * cap._BQC may get cleared due to _BQC is found to be broken
817          * in acpi_video_bqc_quirk, so check again here.
818          */
819         if (!device->cap._BQC)
820                 goto set_level;
821
822         if (use_bios_initial_backlight) {
823                 level = acpi_video_bqc_value_to_level(device, level_old);
824                 /*
825                  * On some buggy laptops, _BQC returns an uninitialized
826                  * value when invoked for the first time, i.e.
827                  * level_old is invalid (no matter whether it's a level
828                  * or an index). Set the backlight to max_level in this case.
829                  */
830                 for (i = 2; i < br->count; i++)
831                         if (level_old == br->levels[i])
832                                 break;
833                 if (i == br->count)
834                         level = max_level;
835         }
836
837 set_level:
838         result = acpi_video_device_lcd_set_level(device, level);
839         if (result)
840                 goto out_free_levels;
841
842         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
843                           "found %d brightness levels\n", count - 2));
844         kfree(obj);
845         return result;
846
847 out_free_levels:
848         kfree(br->levels);
849 out_free:
850         kfree(br);
851 out:
852         device->brightness = NULL;
853         kfree(obj);
854         return result;
855 }
856
857 /*
858  *  Arg:
859  *      device  : video output device (LCD, CRT, ..)
860  *
861  *  Return Value:
862  *      None
863  *
864  *  Find out all required AML methods defined under the output
865  *  device.
866  */
867
868 static void acpi_video_device_find_cap(struct acpi_video_device *device)
869 {
870         acpi_handle h_dummy1;
871
872         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
873                 device->cap._ADR = 1;
874         }
875         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
876                 device->cap._BCL = 1;
877         }
878         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
879                 device->cap._BCM = 1;
880         }
881         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
882                 device->cap._BQC = 1;
883         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
884                                 &h_dummy1))) {
885                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
886                 device->cap._BCQ = 1;
887         }
888
889         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
890                 device->cap._DDC = 1;
891         }
892
893         if (acpi_video_backlight_support()) {
894                 struct backlight_properties props;
895                 struct pci_dev *pdev;
896                 acpi_handle acpi_parent;
897                 struct device *parent = NULL;
898                 int result;
899                 static int count = 0;
900                 char *name;
901
902                 result = acpi_video_init_brightness(device);
903                 if (result)
904                         return;
905                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
906                 if (!name)
907                         return;
908                 count++;
909
910                 acpi_get_parent(device->dev->handle, &acpi_parent);
911
912                 pdev = acpi_get_pci_dev(acpi_parent);
913                 if (pdev) {
914                         parent = &pdev->dev;
915                         pci_dev_put(pdev);
916                 }
917
918                 memset(&props, 0, sizeof(struct backlight_properties));
919                 props.type = BACKLIGHT_FIRMWARE;
920                 props.max_brightness = device->brightness->count - 3;
921                 device->backlight = backlight_device_register(name,
922                                                               parent,
923                                                               device,
924                                                               &acpi_backlight_ops,
925                                                               &props);
926                 kfree(name);
927                 if (IS_ERR(device->backlight))
928                         return;
929
930                 /*
931                  * Save current brightness level in case we have to restore it
932                  * before acpi_video_device_lcd_set_level() is called next time.
933                  */
934                 device->backlight->props.brightness =
935                                 acpi_video_get_brightness(device->backlight);
936
937                 device->cooling_dev = thermal_cooling_device_register("LCD",
938                                         device->dev, &video_cooling_ops);
939                 if (IS_ERR(device->cooling_dev)) {
940                         /*
941                          * Set cooling_dev to NULL so we don't crash trying to
942                          * free it.
943                          * Also, why the hell we are returning early and
944                          * not attempt to register video output if cooling
945                          * device registration failed?
946                          * -- dtor
947                          */
948                         device->cooling_dev = NULL;
949                         return;
950                 }
951
952                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
953                          device->cooling_dev->id);
954                 result = sysfs_create_link(&device->dev->dev.kobj,
955                                 &device->cooling_dev->device.kobj,
956                                 "thermal_cooling");
957                 if (result)
958                         printk(KERN_ERR PREFIX "Create sysfs link\n");
959                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
960                                 &device->dev->dev.kobj, "device");
961                 if (result)
962                         printk(KERN_ERR PREFIX "Create sysfs link\n");
963
964         }
965 }
966
967 /*
968  *  Arg:        
969  *      device  : video output device (VGA)
970  *
971  *  Return Value:
972  *      None
973  *
974  *  Find out all required AML methods defined under the video bus device.
975  */
976
977 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
978 {
979         acpi_handle h_dummy1;
980
981         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
982                 video->cap._DOS = 1;
983         }
984         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
985                 video->cap._DOD = 1;
986         }
987         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
988                 video->cap._ROM = 1;
989         }
990         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
991                 video->cap._GPD = 1;
992         }
993         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
994                 video->cap._SPD = 1;
995         }
996         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
997                 video->cap._VPO = 1;
998         }
999 }
1000
1001 /*
1002  * Check whether the video bus device has required AML method to
1003  * support the desired features
1004  */
1005
1006 static int acpi_video_bus_check(struct acpi_video_bus *video)
1007 {
1008         acpi_status status = -ENOENT;
1009         struct pci_dev *dev;
1010
1011         if (!video)
1012                 return -EINVAL;
1013
1014         dev = acpi_get_pci_dev(video->device->handle);
1015         if (!dev)
1016                 return -ENODEV;
1017         pci_dev_put(dev);
1018
1019         /* Since there is no HID, CID and so on for VGA driver, we have
1020          * to check well known required nodes.
1021          */
1022
1023         /* Does this device support video switching? */
1024         if (video->cap._DOS || video->cap._DOD) {
1025                 if (!video->cap._DOS) {
1026                         printk(KERN_WARNING FW_BUG
1027                                 "ACPI(%s) defines _DOD but not _DOS\n",
1028                                 acpi_device_bid(video->device));
1029                 }
1030                 video->flags.multihead = 1;
1031                 status = 0;
1032         }
1033
1034         /* Does this device support retrieving a video ROM? */
1035         if (video->cap._ROM) {
1036                 video->flags.rom = 1;
1037                 status = 0;
1038         }
1039
1040         /* Does this device support configuring which video device to POST? */
1041         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1042                 video->flags.post = 1;
1043                 status = 0;
1044         }
1045
1046         return status;
1047 }
1048
1049 /* --------------------------------------------------------------------------
1050                                  Driver Interface
1051    -------------------------------------------------------------------------- */
1052
1053 /* device interface */
1054 static struct acpi_video_device_attrib*
1055 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1056 {
1057         struct acpi_video_enumerated_device *ids;
1058         int i;
1059
1060         for (i = 0; i < video->attached_count; i++) {
1061                 ids = &video->attached_array[i];
1062                 if ((ids->value.int_val & 0xffff) == device_id)
1063                         return &ids->value.attrib;
1064         }
1065
1066         return NULL;
1067 }
1068
1069 static int
1070 acpi_video_get_device_type(struct acpi_video_bus *video,
1071                            unsigned long device_id)
1072 {
1073         struct acpi_video_enumerated_device *ids;
1074         int i;
1075
1076         for (i = 0; i < video->attached_count; i++) {
1077                 ids = &video->attached_array[i];
1078                 if ((ids->value.int_val & 0xffff) == device_id)
1079                         return ids->value.int_val;
1080         }
1081
1082         return 0;
1083 }
1084
1085 static int
1086 acpi_video_bus_get_one_device(struct acpi_device *device,
1087                               struct acpi_video_bus *video)
1088 {
1089         unsigned long long device_id;
1090         int status, device_type;
1091         struct acpi_video_device *data;
1092         struct acpi_video_device_attrib* attribute;
1093
1094         status =
1095             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1096         /* Some device omits _ADR, we skip them instead of fail */
1097         if (ACPI_FAILURE(status))
1098                 return 0;
1099
1100         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1101         if (!data)
1102                 return -ENOMEM;
1103
1104         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1105         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1106         device->driver_data = data;
1107
1108         data->device_id = device_id;
1109         data->video = video;
1110         data->dev = device;
1111
1112         attribute = acpi_video_get_device_attr(video, device_id);
1113
1114         if((attribute != NULL) && attribute->device_id_scheme) {
1115                 switch (attribute->display_type) {
1116                 case ACPI_VIDEO_DISPLAY_CRT:
1117                         data->flags.crt = 1;
1118                         break;
1119                 case ACPI_VIDEO_DISPLAY_TV:
1120                         data->flags.tvout = 1;
1121                         break;
1122                 case ACPI_VIDEO_DISPLAY_DVI:
1123                         data->flags.dvi = 1;
1124                         break;
1125                 case ACPI_VIDEO_DISPLAY_LCD:
1126                         data->flags.lcd = 1;
1127                         break;
1128                 default:
1129                         data->flags.unknown = 1;
1130                         break;
1131                 }
1132                 if(attribute->bios_can_detect)
1133                         data->flags.bios = 1;
1134         } else {
1135                 /* Check for legacy IDs */
1136                 device_type = acpi_video_get_device_type(video, device_id);
1137                 /* Ignore bits 16 and 18-20 */
1138                 switch (device_type & 0xffe2ffff) {
1139                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1140                                 data->flags.crt = 1;
1141                                 break;
1142                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1143                                 data->flags.lcd = 1;
1144                                 break;
1145                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1146                                 data->flags.tvout = 1;
1147                                 break;
1148                         default:
1149                                 data->flags.unknown = 1;
1150                 }
1151         }
1152
1153         acpi_video_device_bind(video, data);
1154         acpi_video_device_find_cap(data);
1155
1156         status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1157                                              acpi_video_device_notify, data);
1158         if (ACPI_FAILURE(status))
1159                 dev_err(&device->dev, "Error installing notify handler\n");
1160         else
1161                 data->flags.notify = 1;
1162
1163         mutex_lock(&video->device_list_lock);
1164         list_add_tail(&data->entry, &video->video_device_list);
1165         mutex_unlock(&video->device_list_lock);
1166
1167         return status;
1168 }
1169
1170 /*
1171  *  Arg:
1172  *      video   : video bus device 
1173  *
1174  *  Return:
1175  *      none
1176  *  
1177  *  Enumerate the video device list of the video bus, 
1178  *  bind the ids with the corresponding video devices
1179  *  under the video bus.
1180  */
1181
1182 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1183 {
1184         struct acpi_video_device *dev;
1185
1186         mutex_lock(&video->device_list_lock);
1187
1188         list_for_each_entry(dev, &video->video_device_list, entry)
1189                 acpi_video_device_bind(video, dev);
1190
1191         mutex_unlock(&video->device_list_lock);
1192 }
1193
1194 /*
1195  *  Arg:
1196  *      video   : video bus device 
1197  *      device  : video output device under the video 
1198  *              bus
1199  *
1200  *  Return:
1201  *      none
1202  *  
1203  *  Bind the ids with the corresponding video devices
1204  *  under the video bus.
1205  */
1206
1207 static void
1208 acpi_video_device_bind(struct acpi_video_bus *video,
1209                        struct acpi_video_device *device)
1210 {
1211         struct acpi_video_enumerated_device *ids;
1212         int i;
1213
1214         for (i = 0; i < video->attached_count; i++) {
1215                 ids = &video->attached_array[i];
1216                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1217                         ids->bind_info = device;
1218                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1219                 }
1220         }
1221 }
1222
1223 /*
1224  *  Arg:
1225  *      video   : video bus device 
1226  *
1227  *  Return:
1228  *      < 0     : error
1229  *  
1230  *  Call _DOD to enumerate all devices attached to display adapter
1231  *
1232  */
1233
1234 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1235 {
1236         int status;
1237         int count;
1238         int i;
1239         struct acpi_video_enumerated_device *active_list;
1240         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1241         union acpi_object *dod = NULL;
1242         union acpi_object *obj;
1243
1244         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1245         if (!ACPI_SUCCESS(status)) {
1246                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1247                 return status;
1248         }
1249
1250         dod = buffer.pointer;
1251         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1252                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1253                 status = -EFAULT;
1254                 goto out;
1255         }
1256
1257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1258                           dod->package.count));
1259
1260         active_list = kcalloc(1 + dod->package.count,
1261                               sizeof(struct acpi_video_enumerated_device),
1262                               GFP_KERNEL);
1263         if (!active_list) {
1264                 status = -ENOMEM;
1265                 goto out;
1266         }
1267
1268         count = 0;
1269         for (i = 0; i < dod->package.count; i++) {
1270                 obj = &dod->package.elements[i];
1271
1272                 if (obj->type != ACPI_TYPE_INTEGER) {
1273                         printk(KERN_ERR PREFIX
1274                                 "Invalid _DOD data in element %d\n", i);
1275                         continue;
1276                 }
1277
1278                 active_list[count].value.int_val = obj->integer.value;
1279                 active_list[count].bind_info = NULL;
1280                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1281                                   (int)obj->integer.value));
1282                 count++;
1283         }
1284
1285         kfree(video->attached_array);
1286
1287         video->attached_array = active_list;
1288         video->attached_count = count;
1289
1290  out:
1291         kfree(buffer.pointer);
1292         return status;
1293 }
1294
1295 static int
1296 acpi_video_get_next_level(struct acpi_video_device *device,
1297                           u32 level_current, u32 event)
1298 {
1299         int min, max, min_above, max_below, i, l, delta = 255;
1300         max = max_below = 0;
1301         min = min_above = 255;
1302         /* Find closest level to level_current */
1303         for (i = 2; i < device->brightness->count; i++) {
1304                 l = device->brightness->levels[i];
1305                 if (abs(l - level_current) < abs(delta)) {
1306                         delta = l - level_current;
1307                         if (!delta)
1308                                 break;
1309                 }
1310         }
1311         /* Ajust level_current to closest available level */
1312         level_current += delta;
1313         for (i = 2; i < device->brightness->count; i++) {
1314                 l = device->brightness->levels[i];
1315                 if (l < min)
1316                         min = l;
1317                 if (l > max)
1318                         max = l;
1319                 if (l < min_above && l > level_current)
1320                         min_above = l;
1321                 if (l > max_below && l < level_current)
1322                         max_below = l;
1323         }
1324
1325         switch (event) {
1326         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1327                 return (level_current < max) ? min_above : min;
1328         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1329                 return (level_current < max) ? min_above : max;
1330         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1331                 return (level_current > min) ? max_below : min;
1332         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1333         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1334                 return 0;
1335         default:
1336                 return level_current;
1337         }
1338 }
1339
1340 static int
1341 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1342 {
1343         unsigned long long level_current, level_next;
1344         int result = -EINVAL;
1345
1346         /* no warning message if acpi_backlight=vendor is used */
1347         if (!acpi_video_backlight_support())
1348                 return 0;
1349
1350         if (!device->brightness)
1351                 goto out;
1352
1353         result = acpi_video_device_lcd_get_level_current(device,
1354                                                          &level_current,
1355                                                          false);
1356         if (result)
1357                 goto out;
1358
1359         level_next = acpi_video_get_next_level(device, level_current, event);
1360
1361         result = acpi_video_device_lcd_set_level(device, level_next);
1362
1363         if (!result)
1364                 backlight_force_update(device->backlight,
1365                                        BACKLIGHT_UPDATE_HOTKEY);
1366
1367 out:
1368         if (result)
1369                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1370
1371         return result;
1372 }
1373
1374 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1375                         void **edid)
1376 {
1377         struct acpi_video_bus *video;
1378         struct acpi_video_device *video_device;
1379         union acpi_object *buffer = NULL;
1380         acpi_status status;
1381         int i, length;
1382
1383         if (!device || !acpi_driver_data(device))
1384                 return -EINVAL;
1385
1386         video = acpi_driver_data(device);
1387
1388         for (i = 0; i < video->attached_count; i++) {
1389                 video_device = video->attached_array[i].bind_info;
1390                 length = 256;
1391
1392                 if (!video_device)
1393                         continue;
1394
1395                 if (!video_device->cap._DDC)
1396                         continue;
1397
1398                 if (type) {
1399                         switch (type) {
1400                         case ACPI_VIDEO_DISPLAY_CRT:
1401                                 if (!video_device->flags.crt)
1402                                         continue;
1403                                 break;
1404                         case ACPI_VIDEO_DISPLAY_TV:
1405                                 if (!video_device->flags.tvout)
1406                                         continue;
1407                                 break;
1408                         case ACPI_VIDEO_DISPLAY_DVI:
1409                                 if (!video_device->flags.dvi)
1410                                         continue;
1411                                 break;
1412                         case ACPI_VIDEO_DISPLAY_LCD:
1413                                 if (!video_device->flags.lcd)
1414                                         continue;
1415                                 break;
1416                         }
1417                 } else if (video_device->device_id != device_id) {
1418                         continue;
1419                 }
1420
1421                 status = acpi_video_device_EDID(video_device, &buffer, length);
1422
1423                 if (ACPI_FAILURE(status) || !buffer ||
1424                     buffer->type != ACPI_TYPE_BUFFER) {
1425                         length = 128;
1426                         status = acpi_video_device_EDID(video_device, &buffer,
1427                                                         length);
1428                         if (ACPI_FAILURE(status) || !buffer ||
1429                             buffer->type != ACPI_TYPE_BUFFER) {
1430                                 continue;
1431                         }
1432                 }
1433
1434                 *edid = buffer->buffer.pointer;
1435                 return length;
1436         }
1437
1438         return -ENODEV;
1439 }
1440 EXPORT_SYMBOL(acpi_video_get_edid);
1441
1442 static int
1443 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1444                            struct acpi_device *device)
1445 {
1446         int status = 0;
1447         struct acpi_device *dev;
1448
1449         /*
1450          * There are systems where video module known to work fine regardless
1451          * of broken _DOD and ignoring returned value here doesn't cause
1452          * any issues later.
1453          */
1454         acpi_video_device_enumerate(video);
1455
1456         list_for_each_entry(dev, &device->children, node) {
1457
1458                 status = acpi_video_bus_get_one_device(dev, video);
1459                 if (status) {
1460                         dev_err(&dev->dev, "Can't attach device\n");
1461                         break;
1462                 }
1463         }
1464         return status;
1465 }
1466
1467 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1468 {
1469         acpi_status status;
1470
1471         if (!device || !device->video)
1472                 return -ENOENT;
1473
1474         if (device->flags.notify) {
1475                 status = acpi_remove_notify_handler(device->dev->handle,
1476                                 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1477                 if (ACPI_FAILURE(status))
1478                         dev_err(&device->dev->dev,
1479                                         "Can't remove video notify handler\n");
1480         }
1481
1482         if (device->backlight) {
1483                 backlight_device_unregister(device->backlight);
1484                 device->backlight = NULL;
1485         }
1486         if (device->cooling_dev) {
1487                 sysfs_remove_link(&device->dev->dev.kobj,
1488                                   "thermal_cooling");
1489                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1490                                   "device");
1491                 thermal_cooling_device_unregister(device->cooling_dev);
1492                 device->cooling_dev = NULL;
1493         }
1494
1495         return 0;
1496 }
1497
1498 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1499 {
1500         int status;
1501         struct acpi_video_device *dev, *next;
1502
1503         mutex_lock(&video->device_list_lock);
1504
1505         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1506
1507                 status = acpi_video_bus_put_one_device(dev);
1508                 if (ACPI_FAILURE(status))
1509                         printk(KERN_WARNING PREFIX
1510                                "hhuuhhuu bug in acpi video driver.\n");
1511
1512                 if (dev->brightness) {
1513                         kfree(dev->brightness->levels);
1514                         kfree(dev->brightness);
1515                 }
1516                 list_del(&dev->entry);
1517                 kfree(dev);
1518         }
1519
1520         mutex_unlock(&video->device_list_lock);
1521
1522         return 0;
1523 }
1524
1525 /* acpi_video interface */
1526
1527 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1528 {
1529         return acpi_video_bus_DOS(video, 0, 0);
1530 }
1531
1532 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1533 {
1534         return acpi_video_bus_DOS(video, 0, 1);
1535 }
1536
1537 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1538 {
1539         struct acpi_video_bus *video = acpi_driver_data(device);
1540         struct input_dev *input;
1541         int keycode = 0;
1542
1543         if (!video)
1544                 return;
1545
1546         input = video->input;
1547
1548         switch (event) {
1549         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1550                                          * most likely via hotkey. */
1551                 acpi_bus_generate_proc_event(device, event, 0);
1552                 keycode = KEY_SWITCHVIDEOMODE;
1553                 break;
1554
1555         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1556                                          * connector. */
1557                 acpi_video_device_enumerate(video);
1558                 acpi_video_device_rebind(video);
1559                 acpi_bus_generate_proc_event(device, event, 0);
1560                 keycode = KEY_SWITCHVIDEOMODE;
1561                 break;
1562
1563         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1564                 acpi_bus_generate_proc_event(device, event, 0);
1565                 keycode = KEY_SWITCHVIDEOMODE;
1566                 break;
1567         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1568                 acpi_bus_generate_proc_event(device, event, 0);
1569                 keycode = KEY_VIDEO_NEXT;
1570                 break;
1571         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1572                 acpi_bus_generate_proc_event(device, event, 0);
1573                 keycode = KEY_VIDEO_PREV;
1574                 break;
1575
1576         default:
1577                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1578                                   "Unsupported event [0x%x]\n", event));
1579                 break;
1580         }
1581
1582         if (acpi_notifier_call_chain(device, event, 0))
1583                 /* Something vetoed the keypress. */
1584                 keycode = 0;
1585
1586         if (keycode) {
1587                 input_report_key(input, keycode, 1);
1588                 input_sync(input);
1589                 input_report_key(input, keycode, 0);
1590                 input_sync(input);
1591         }
1592
1593         return;
1594 }
1595
1596 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1597 {
1598         struct acpi_video_device *video_device = data;
1599         struct acpi_device *device = NULL;
1600         struct acpi_video_bus *bus;
1601         struct input_dev *input;
1602         int keycode = 0;
1603
1604         if (!video_device)
1605                 return;
1606
1607         device = video_device->dev;
1608         bus = video_device->video;
1609         input = bus->input;
1610
1611         switch (event) {
1612         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1613                 if (brightness_switch_enabled)
1614                         acpi_video_switch_brightness(video_device, event);
1615                 acpi_bus_generate_proc_event(device, event, 0);
1616                 keycode = KEY_BRIGHTNESS_CYCLE;
1617                 break;
1618         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1619                 if (brightness_switch_enabled)
1620                         acpi_video_switch_brightness(video_device, event);
1621                 acpi_bus_generate_proc_event(device, event, 0);
1622                 keycode = KEY_BRIGHTNESSUP;
1623                 break;
1624         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1625                 if (brightness_switch_enabled)
1626                         acpi_video_switch_brightness(video_device, event);
1627                 acpi_bus_generate_proc_event(device, event, 0);
1628                 keycode = KEY_BRIGHTNESSDOWN;
1629                 break;
1630         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1631                 if (brightness_switch_enabled)
1632                         acpi_video_switch_brightness(video_device, event);
1633                 acpi_bus_generate_proc_event(device, event, 0);
1634                 keycode = KEY_BRIGHTNESS_ZERO;
1635                 break;
1636         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1637                 if (brightness_switch_enabled)
1638                         acpi_video_switch_brightness(video_device, event);
1639                 acpi_bus_generate_proc_event(device, event, 0);
1640                 keycode = KEY_DISPLAY_OFF;
1641                 break;
1642         default:
1643                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1644                                   "Unsupported event [0x%x]\n", event));
1645                 break;
1646         }
1647
1648         acpi_notifier_call_chain(device, event, 0);
1649
1650         if (keycode) {
1651                 input_report_key(input, keycode, 1);
1652                 input_sync(input);
1653                 input_report_key(input, keycode, 0);
1654                 input_sync(input);
1655         }
1656
1657         return;
1658 }
1659
1660 static int acpi_video_resume(struct notifier_block *nb,
1661                                 unsigned long val, void *ign)
1662 {
1663         struct acpi_video_bus *video;
1664         struct acpi_video_device *video_device;
1665         int i;
1666
1667         switch (val) {
1668         case PM_HIBERNATION_PREPARE:
1669         case PM_SUSPEND_PREPARE:
1670         case PM_RESTORE_PREPARE:
1671                 return NOTIFY_DONE;
1672         }
1673
1674         video = container_of(nb, struct acpi_video_bus, pm_nb);
1675
1676         dev_info(&video->device->dev, "Restoring backlight state\n");
1677
1678         for (i = 0; i < video->attached_count; i++) {
1679                 video_device = video->attached_array[i].bind_info;
1680                 if (video_device && video_device->backlight)
1681                         acpi_video_set_brightness(video_device->backlight);
1682         }
1683
1684         return NOTIFY_OK;
1685 }
1686
1687 static acpi_status
1688 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1689                         void **return_value)
1690 {
1691         struct acpi_device *device = context;
1692         struct acpi_device *sibling;
1693         int result;
1694
1695         if (handle == device->handle)
1696                 return AE_CTRL_TERMINATE;
1697
1698         result = acpi_bus_get_device(handle, &sibling);
1699         if (result)
1700                 return AE_OK;
1701
1702         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1703                         return AE_ALREADY_EXISTS;
1704
1705         return AE_OK;
1706 }
1707
1708 static int instance;
1709
1710 static int acpi_video_bus_add(struct acpi_device *device)
1711 {
1712         struct acpi_video_bus *video;
1713         struct input_dev *input;
1714         int error;
1715         acpi_status status;
1716
1717         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1718                                 device->parent->handle, 1,
1719                                 acpi_video_bus_match, NULL,
1720                                 device, NULL);
1721         if (status == AE_ALREADY_EXISTS) {
1722                 printk(KERN_WARNING FW_BUG
1723                         "Duplicate ACPI video bus devices for the"
1724                         " same VGA controller, please try module "
1725                         "parameter \"video.allow_duplicates=1\""
1726                         "if the current driver doesn't work.\n");
1727                 if (!allow_duplicates)
1728                         return -ENODEV;
1729         }
1730
1731         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1732         if (!video)
1733                 return -ENOMEM;
1734
1735         /* a hack to fix the duplicate name "VID" problem on T61 */
1736         if (!strcmp(device->pnp.bus_id, "VID")) {
1737                 if (instance)
1738                         device->pnp.bus_id[3] = '0' + instance;
1739                 instance ++;
1740         }
1741         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1742         if (!strcmp(device->pnp.bus_id, "VGA")) {
1743                 if (instance)
1744                         device->pnp.bus_id[3] = '0' + instance;
1745                 instance++;
1746         }
1747
1748         video->device = device;
1749         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1750         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1751         device->driver_data = video;
1752
1753         acpi_video_bus_find_cap(video);
1754         error = acpi_video_bus_check(video);
1755         if (error)
1756                 goto err_free_video;
1757
1758         mutex_init(&video->device_list_lock);
1759         INIT_LIST_HEAD(&video->video_device_list);
1760
1761         error = acpi_video_bus_get_devices(video, device);
1762         if (error)
1763                 goto err_put_video;
1764
1765         video->input = input = input_allocate_device();
1766         if (!input) {
1767                 error = -ENOMEM;
1768                 goto err_put_video;
1769         }
1770
1771         error = acpi_video_bus_start_devices(video);
1772         if (error)
1773                 goto err_free_input_dev;
1774
1775         snprintf(video->phys, sizeof(video->phys),
1776                 "%s/video/input0", acpi_device_hid(video->device));
1777
1778         input->name = acpi_device_name(video->device);
1779         input->phys = video->phys;
1780         input->id.bustype = BUS_HOST;
1781         input->id.product = 0x06;
1782         input->dev.parent = &device->dev;
1783         input->evbit[0] = BIT(EV_KEY);
1784         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1785         set_bit(KEY_VIDEO_NEXT, input->keybit);
1786         set_bit(KEY_VIDEO_PREV, input->keybit);
1787         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1788         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1789         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1790         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1791         set_bit(KEY_DISPLAY_OFF, input->keybit);
1792
1793         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1794                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1795                video->flags.multihead ? "yes" : "no",
1796                video->flags.rom ? "yes" : "no",
1797                video->flags.post ? "yes" : "no");
1798
1799         video->pm_nb.notifier_call = acpi_video_resume;
1800         video->pm_nb.priority = 0;
1801         error = register_pm_notifier(&video->pm_nb);
1802         if (error)
1803                 goto err_stop_video;
1804
1805         error = input_register_device(input);
1806         if (error)
1807                 goto err_unregister_pm_notifier;
1808
1809         return 0;
1810
1811  err_unregister_pm_notifier:
1812         unregister_pm_notifier(&video->pm_nb);
1813  err_stop_video:
1814         acpi_video_bus_stop_devices(video);
1815  err_free_input_dev:
1816         input_free_device(input);
1817  err_put_video:
1818         acpi_video_bus_put_devices(video);
1819         kfree(video->attached_array);
1820  err_free_video:
1821         kfree(video);
1822         device->driver_data = NULL;
1823
1824         return error;
1825 }
1826
1827 static int acpi_video_bus_remove(struct acpi_device *device)
1828 {
1829         struct acpi_video_bus *video = NULL;
1830
1831
1832         if (!device || !acpi_driver_data(device))
1833                 return -EINVAL;
1834
1835         video = acpi_driver_data(device);
1836
1837         unregister_pm_notifier(&video->pm_nb);
1838
1839         acpi_video_bus_stop_devices(video);
1840         acpi_video_bus_put_devices(video);
1841
1842         input_unregister_device(video->input);
1843         kfree(video->attached_array);
1844         kfree(video);
1845
1846         return 0;
1847 }
1848
1849 static int __init is_i740(struct pci_dev *dev)
1850 {
1851         if (dev->device == 0x00D1)
1852                 return 1;
1853         if (dev->device == 0x7000)
1854                 return 1;
1855         return 0;
1856 }
1857
1858 static int __init intel_opregion_present(void)
1859 {
1860         int opregion = 0;
1861         struct pci_dev *dev = NULL;
1862         u32 address;
1863
1864         for_each_pci_dev(dev) {
1865                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1866                         continue;
1867                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1868                         continue;
1869                 /* We don't want to poke around undefined i740 registers */
1870                 if (is_i740(dev))
1871                         continue;
1872                 pci_read_config_dword(dev, 0xfc, &address);
1873                 if (!address)
1874                         continue;
1875                 opregion = 1;
1876         }
1877         return opregion;
1878 }
1879
1880 int acpi_video_register(void)
1881 {
1882         int result = 0;
1883         if (register_count) {
1884                 /*
1885                  * if the function of acpi_video_register is already called,
1886                  * don't register the acpi_vide_bus again and return no error.
1887                  */
1888                 return 0;
1889         }
1890
1891         result = acpi_bus_register_driver(&acpi_video_bus);
1892         if (result < 0)
1893                 return -ENODEV;
1894
1895         /*
1896          * When the acpi_video_bus is loaded successfully, increase
1897          * the counter reference.
1898          */
1899         register_count = 1;
1900
1901         return 0;
1902 }
1903 EXPORT_SYMBOL(acpi_video_register);
1904
1905 void acpi_video_unregister(void)
1906 {
1907         if (!register_count) {
1908                 /*
1909                  * If the acpi video bus is already unloaded, don't
1910                  * unload it again and return directly.
1911                  */
1912                 return;
1913         }
1914         acpi_bus_unregister_driver(&acpi_video_bus);
1915
1916         register_count = 0;
1917
1918         return;
1919 }
1920 EXPORT_SYMBOL(acpi_video_unregister);
1921
1922 /*
1923  * This is kind of nasty. Hardware using Intel chipsets may require
1924  * the video opregion code to be run first in order to initialise
1925  * state before any ACPI video calls are made. To handle this we defer
1926  * registration of the video class until the opregion code has run.
1927  */
1928
1929 static int __init acpi_video_init(void)
1930 {
1931         dmi_check_system(video_dmi_table);
1932
1933         if (intel_opregion_present())
1934                 return 0;
1935
1936         return acpi_video_register();
1937 }
1938
1939 static void __exit acpi_video_exit(void)
1940 {
1941         acpi_video_unregister();
1942
1943         return;
1944 }
1945
1946 module_init(acpi_video_init);
1947 module_exit(acpi_video_exit);