ACPI / Button: Avoid disabling wakeup unnecessarily on remove
[linux-2.6.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_CLASS                "video"
50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
63
64 #define MAX_NAME_LEN    20
65
66 #define _COMPONENT              ACPI_VIDEO_COMPONENT
67 ACPI_MODULE_NAME("video");
68
69 MODULE_AUTHOR("Bruno Ducrot");
70 MODULE_DESCRIPTION("ACPI Video Driver");
71 MODULE_LICENSE("GPL");
72
73 static int brightness_switch_enabled = 1;
74 module_param(brightness_switch_enabled, bool, 0644);
75
76 /*
77  * By default, we don't allow duplicate ACPI video bus devices
78  * under the same VGA controller
79  */
80 static int allow_duplicates;
81 module_param(allow_duplicates, bool, 0644);
82
83 /*
84  * Some BIOSes claim they use minimum backlight at boot,
85  * and this may bring dimming screen after boot
86  */
87 static int use_bios_initial_backlight = 1;
88 module_param(use_bios_initial_backlight, bool, 0644);
89
90 static int register_count = 0;
91 static int acpi_video_bus_add(struct acpi_device *device);
92 static int acpi_video_bus_remove(struct acpi_device *device, int type);
93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
94
95 static const struct acpi_device_id video_device_ids[] = {
96         {ACPI_VIDEO_HID, 0},
97         {"", 0},
98 };
99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100
101 static struct acpi_driver acpi_video_bus = {
102         .name = "video",
103         .class = ACPI_VIDEO_CLASS,
104         .ids = video_device_ids,
105         .ops = {
106                 .add = acpi_video_bus_add,
107                 .remove = acpi_video_bus_remove,
108                 .notify = acpi_video_bus_notify,
109                 },
110 };
111
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 */
116         u8 reserved:5;
117 };
118
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 */
126         u8 reserved:2;
127 };
128
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 
136                                    the VGA device. */
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 */
140 };
141
142 struct acpi_video_enumerated_device {
143         union {
144                 u32 int_val;
145                 struct acpi_video_device_attrib attrib;
146         } value;
147         struct acpi_video_device *bind_info;
148 };
149
150 struct acpi_video_bus {
151         struct acpi_device *device;
152         u8 dos_setting;
153         struct acpi_video_enumerated_device *attached_array;
154         u8 attached_count;
155         struct acpi_video_bus_cap cap;
156         struct acpi_video_bus_flags flags;
157         struct list_head video_device_list;
158         struct mutex device_list_lock;  /* protects video_device_list */
159         struct input_dev *input;
160         char phys[32];  /* for input device */
161         struct notifier_block pm_nb;
162 };
163
164 struct acpi_video_device_flags {
165         u8 crt:1;
166         u8 lcd:1;
167         u8 tvout:1;
168         u8 dvi:1;
169         u8 bios:1;
170         u8 unknown:1;
171         u8 reserved:2;
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, int init);
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, 0))
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, 0))
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 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 struct dmi_system_id video_dmi_table[] __initdata = {
394         /*
395          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
396          */
397         {
398          .callback = video_set_bqc_offset,
399          .ident = "Acer Aspire 5720",
400          .matches = {
401                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
402                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
403                 },
404         },
405         {
406          .callback = video_set_bqc_offset,
407          .ident = "Acer Aspire 5710Z",
408          .matches = {
409                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
410                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
411                 },
412         },
413         {
414          .callback = video_set_bqc_offset,
415          .ident = "eMachines E510",
416          .matches = {
417                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
418                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
419                 },
420         },
421         {
422          .callback = video_set_bqc_offset,
423          .ident = "Acer Aspire 5315",
424          .matches = {
425                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
426                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
427                 },
428         },
429         {
430          .callback = video_set_bqc_offset,
431          .ident = "Acer Aspire 7720",
432          .matches = {
433                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
435                 },
436         },
437         {}
438 };
439
440 static int
441 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
442                                         unsigned long long *level, int init)
443 {
444         acpi_status status = AE_OK;
445         int i;
446
447         if (device->cap._BQC || device->cap._BCQ) {
448                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
449
450                 status = acpi_evaluate_integer(device->dev->handle, buf,
451                                                 NULL, level);
452                 if (ACPI_SUCCESS(status)) {
453                         if (device->brightness->flags._BQC_use_index) {
454                                 if (device->brightness->flags._BCL_reversed)
455                                         *level = device->brightness->count
456                                                                  - 3 - (*level);
457                                 *level = device->brightness->levels[*level + 2];
458
459                         }
460                         *level += bqc_offset_aml_bug_workaround;
461                         for (i = 2; i < device->brightness->count; i++)
462                                 if (device->brightness->levels[i] == *level) {
463                                         device->brightness->curr = *level;
464                                         return 0;
465                         }
466                         if (!init) {
467                                 /*
468                                  * BQC returned an invalid level.
469                                  * Stop using it.
470                                  */
471                                 ACPI_WARNING((AE_INFO,
472                                               "%s returned an invalid level",
473                                               buf));
474                                 device->cap._BQC = device->cap._BCQ = 0;
475                         }
476                 } else {
477                         /* Fixme:
478                          * should we return an error or ignore this failure?
479                          * dev->brightness->curr is a cached value which stores
480                          * the correct current backlight level in most cases.
481                          * ACPI video backlight still works w/ buggy _BQC.
482                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
483                          */
484                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
485                         device->cap._BQC = device->cap._BCQ = 0;
486                 }
487         }
488
489         *level = device->brightness->curr;
490         return 0;
491 }
492
493 static int
494 acpi_video_device_EDID(struct acpi_video_device *device,
495                        union acpi_object **edid, ssize_t length)
496 {
497         int status;
498         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
499         union acpi_object *obj;
500         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
501         struct acpi_object_list args = { 1, &arg0 };
502
503
504         *edid = NULL;
505
506         if (!device)
507                 return -ENODEV;
508         if (length == 128)
509                 arg0.integer.value = 1;
510         else if (length == 256)
511                 arg0.integer.value = 2;
512         else
513                 return -EINVAL;
514
515         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
516         if (ACPI_FAILURE(status))
517                 return -ENODEV;
518
519         obj = buffer.pointer;
520
521         if (obj && obj->type == ACPI_TYPE_BUFFER)
522                 *edid = obj;
523         else {
524                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
525                 status = -EFAULT;
526                 kfree(obj);
527         }
528
529         return status;
530 }
531
532 /* bus */
533
534 /*
535  *  Arg:
536  *      video           : video bus device pointer
537  *      bios_flag       : 
538  *              0.      The system BIOS should NOT automatically switch(toggle)
539  *                      the active display output.
540  *              1.      The system BIOS should automatically switch (toggle) the
541  *                      active display output. No switch event.
542  *              2.      The _DGS value should be locked.
543  *              3.      The system BIOS should not automatically switch (toggle) the
544  *                      active display output, but instead generate the display switch
545  *                      event notify code.
546  *      lcd_flag        :
547  *              0.      The system BIOS should automatically control the brightness level
548  *                      of the LCD when the power changes from AC to DC
549  *              1.      The system BIOS should NOT automatically control the brightness 
550  *                      level of the LCD when the power changes from AC to DC.
551  * Return Value:
552  *              -1      wrong arg.
553  */
554
555 static int
556 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
557 {
558         u64 status = 0;
559         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
560         struct acpi_object_list args = { 1, &arg0 };
561
562
563         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
564                 status = -1;
565                 goto Failed;
566         }
567         arg0.integer.value = (lcd_flag << 2) | bios_flag;
568         video->dos_setting = arg0.integer.value;
569         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
570
571       Failed:
572         return status;
573 }
574
575 /*
576  * Simple comparison function used to sort backlight levels.
577  */
578
579 static int
580 acpi_video_cmp_level(const void *a, const void *b)
581 {
582         return *(int *)a - *(int *)b;
583 }
584
585 /*
586  *  Arg:        
587  *      device  : video output device (LCD, CRT, ..)
588  *
589  *  Return Value:
590  *      Maximum brightness level
591  *
592  *  Allocate and initialize device->brightness.
593  */
594
595 static int
596 acpi_video_init_brightness(struct acpi_video_device *device)
597 {
598         union acpi_object *obj = NULL;
599         int i, max_level = 0, count = 0, level_ac_battery = 0;
600         unsigned long long level, level_old;
601         union acpi_object *o;
602         struct acpi_video_device_brightness *br = NULL;
603         int result = -EINVAL;
604
605         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
606                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
607                                                 "LCD brightness level\n"));
608                 goto out;
609         }
610
611         if (obj->package.count < 2)
612                 goto out;
613
614         br = kzalloc(sizeof(*br), GFP_KERNEL);
615         if (!br) {
616                 printk(KERN_ERR "can't allocate memory\n");
617                 result = -ENOMEM;
618                 goto out;
619         }
620
621         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
622                                 GFP_KERNEL);
623         if (!br->levels) {
624                 result = -ENOMEM;
625                 goto out_free;
626         }
627
628         for (i = 0; i < obj->package.count; i++) {
629                 o = (union acpi_object *)&obj->package.elements[i];
630                 if (o->type != ACPI_TYPE_INTEGER) {
631                         printk(KERN_ERR PREFIX "Invalid data\n");
632                         continue;
633                 }
634                 br->levels[count] = (u32) o->integer.value;
635
636                 if (br->levels[count] > max_level)
637                         max_level = br->levels[count];
638                 count++;
639         }
640
641         /*
642          * some buggy BIOS don't export the levels
643          * when machine is on AC/Battery in _BCL package.
644          * In this case, the first two elements in _BCL packages
645          * are also supported brightness levels that OS should take care of.
646          */
647         for (i = 2; i < count; i++) {
648                 if (br->levels[i] == br->levels[0])
649                         level_ac_battery++;
650                 if (br->levels[i] == br->levels[1])
651                         level_ac_battery++;
652         }
653
654         if (level_ac_battery < 2) {
655                 level_ac_battery = 2 - level_ac_battery;
656                 br->flags._BCL_no_ac_battery_levels = 1;
657                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
658                         br->levels[i] = br->levels[i - level_ac_battery];
659                 count += level_ac_battery;
660         } else if (level_ac_battery > 2)
661                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
662
663         /* Check if the _BCL package is in a reversed order */
664         if (max_level == br->levels[2]) {
665                 br->flags._BCL_reversed = 1;
666                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
667                         acpi_video_cmp_level, NULL);
668         } else if (max_level != br->levels[count - 1])
669                 ACPI_ERROR((AE_INFO,
670                             "Found unordered _BCL package\n"));
671
672         br->count = count;
673         device->brightness = br;
674
675         /* Check the input/output of _BQC/_BCL/_BCM */
676         if ((max_level < 100) && (max_level <= (count - 2)))
677                 br->flags._BCL_use_index = 1;
678
679         /*
680          * _BCM is always consistent with _BCL,
681          * at least for all the laptops we have ever seen.
682          */
683         br->flags._BCM_use_index = br->flags._BCL_use_index;
684
685         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
686         br->curr = level = max_level;
687
688         if (!device->cap._BQC)
689                 goto set_level;
690
691         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
692         if (result)
693                 goto out_free_levels;
694
695         /*
696          * Set the level to maximum and check if _BQC uses indexed value
697          */
698         result = acpi_video_device_lcd_set_level(device, max_level);
699         if (result)
700                 goto out_free_levels;
701
702         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
703         if (result)
704                 goto out_free_levels;
705
706         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
707
708         if (!br->flags._BQC_use_index) {
709                 /*
710                  * Set the backlight to the initial state.
711                  * On some buggy laptops, _BQC returns an uninitialized value
712                  * when invoked for the first time, i.e. level_old is invalid.
713                  * set the backlight to max_level in this case
714                  */
715                 if (use_bios_initial_backlight) {
716                         for (i = 2; i < br->count; i++)
717                                 if (level_old == br->levels[i])
718                                         level = level_old;
719                 }
720                 goto set_level;
721         }
722
723         if (br->flags._BCL_reversed)
724                 level_old = (br->count - 1) - level_old;
725         level = br->levels[level_old];
726
727 set_level:
728         result = acpi_video_device_lcd_set_level(device, level);
729         if (result)
730                 goto out_free_levels;
731
732         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
733                           "found %d brightness levels\n", count - 2));
734         kfree(obj);
735         return result;
736
737 out_free_levels:
738         kfree(br->levels);
739 out_free:
740         kfree(br);
741 out:
742         device->brightness = NULL;
743         kfree(obj);
744         return result;
745 }
746
747 /*
748  *  Arg:
749  *      device  : video output device (LCD, CRT, ..)
750  *
751  *  Return Value:
752  *      None
753  *
754  *  Find out all required AML methods defined under the output
755  *  device.
756  */
757
758 static void acpi_video_device_find_cap(struct acpi_video_device *device)
759 {
760         acpi_handle h_dummy1;
761
762         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
763                 device->cap._ADR = 1;
764         }
765         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
766                 device->cap._BCL = 1;
767         }
768         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
769                 device->cap._BCM = 1;
770         }
771         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
772                 device->cap._BQC = 1;
773         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
774                                 &h_dummy1))) {
775                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
776                 device->cap._BCQ = 1;
777         }
778
779         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
780                 device->cap._DDC = 1;
781         }
782
783         if (acpi_video_backlight_support()) {
784                 struct backlight_properties props;
785                 int result;
786                 static int count = 0;
787                 char *name;
788
789                 result = acpi_video_init_brightness(device);
790                 if (result)
791                         return;
792                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
793                 if (!name)
794                         return;
795                 count++;
796
797                 memset(&props, 0, sizeof(struct backlight_properties));
798                 props.max_brightness = device->brightness->count - 3;
799                 device->backlight = backlight_device_register(name, NULL, device,
800                                                               &acpi_backlight_ops,
801                                                               &props);
802                 kfree(name);
803                 if (IS_ERR(device->backlight))
804                         return;
805
806                 /*
807                  * Save current brightness level in case we have to restore it
808                  * before acpi_video_device_lcd_set_level() is called next time.
809                  */
810                 device->backlight->props.brightness =
811                                 acpi_video_get_brightness(device->backlight);
812
813                 result = sysfs_create_link(&device->backlight->dev.kobj,
814                                            &device->dev->dev.kobj, "device");
815                 if (result)
816                         printk(KERN_ERR PREFIX "Create sysfs link\n");
817
818                 device->cooling_dev = thermal_cooling_device_register("LCD",
819                                         device->dev, &video_cooling_ops);
820                 if (IS_ERR(device->cooling_dev)) {
821                         /*
822                          * Set cooling_dev to NULL so we don't crash trying to
823                          * free it.
824                          * Also, why the hell we are returning early and
825                          * not attempt to register video output if cooling
826                          * device registration failed?
827                          * -- dtor
828                          */
829                         device->cooling_dev = NULL;
830                         return;
831                 }
832
833                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
834                          device->cooling_dev->id);
835                 result = sysfs_create_link(&device->dev->dev.kobj,
836                                 &device->cooling_dev->device.kobj,
837                                 "thermal_cooling");
838                 if (result)
839                         printk(KERN_ERR PREFIX "Create sysfs link\n");
840                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
841                                 &device->dev->dev.kobj, "device");
842                 if (result)
843                         printk(KERN_ERR PREFIX "Create sysfs link\n");
844
845         }
846 }
847
848 /*
849  *  Arg:        
850  *      device  : video output device (VGA)
851  *
852  *  Return Value:
853  *      None
854  *
855  *  Find out all required AML methods defined under the video bus device.
856  */
857
858 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
859 {
860         acpi_handle h_dummy1;
861
862         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
863                 video->cap._DOS = 1;
864         }
865         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
866                 video->cap._DOD = 1;
867         }
868         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
869                 video->cap._ROM = 1;
870         }
871         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
872                 video->cap._GPD = 1;
873         }
874         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
875                 video->cap._SPD = 1;
876         }
877         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
878                 video->cap._VPO = 1;
879         }
880 }
881
882 /*
883  * Check whether the video bus device has required AML method to
884  * support the desired features
885  */
886
887 static int acpi_video_bus_check(struct acpi_video_bus *video)
888 {
889         acpi_status status = -ENOENT;
890         struct pci_dev *dev;
891
892         if (!video)
893                 return -EINVAL;
894
895         dev = acpi_get_pci_dev(video->device->handle);
896         if (!dev)
897                 return -ENODEV;
898         pci_dev_put(dev);
899
900         /* Since there is no HID, CID and so on for VGA driver, we have
901          * to check well known required nodes.
902          */
903
904         /* Does this device support video switching? */
905         if (video->cap._DOS || video->cap._DOD) {
906                 if (!video->cap._DOS) {
907                         printk(KERN_WARNING FW_BUG
908                                 "ACPI(%s) defines _DOD but not _DOS\n",
909                                 acpi_device_bid(video->device));
910                 }
911                 video->flags.multihead = 1;
912                 status = 0;
913         }
914
915         /* Does this device support retrieving a video ROM? */
916         if (video->cap._ROM) {
917                 video->flags.rom = 1;
918                 status = 0;
919         }
920
921         /* Does this device support configuring which video device to POST? */
922         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
923                 video->flags.post = 1;
924                 status = 0;
925         }
926
927         return status;
928 }
929
930 /* --------------------------------------------------------------------------
931                                  Driver Interface
932    -------------------------------------------------------------------------- */
933
934 /* device interface */
935 static struct acpi_video_device_attrib*
936 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
937 {
938         struct acpi_video_enumerated_device *ids;
939         int i;
940
941         for (i = 0; i < video->attached_count; i++) {
942                 ids = &video->attached_array[i];
943                 if ((ids->value.int_val & 0xffff) == device_id)
944                         return &ids->value.attrib;
945         }
946
947         return NULL;
948 }
949
950 static int
951 acpi_video_get_device_type(struct acpi_video_bus *video,
952                            unsigned long device_id)
953 {
954         struct acpi_video_enumerated_device *ids;
955         int i;
956
957         for (i = 0; i < video->attached_count; i++) {
958                 ids = &video->attached_array[i];
959                 if ((ids->value.int_val & 0xffff) == device_id)
960                         return ids->value.int_val;
961         }
962
963         return 0;
964 }
965
966 static int
967 acpi_video_bus_get_one_device(struct acpi_device *device,
968                               struct acpi_video_bus *video)
969 {
970         unsigned long long device_id;
971         int status, device_type;
972         struct acpi_video_device *data;
973         struct acpi_video_device_attrib* attribute;
974
975         if (!device || !video)
976                 return -EINVAL;
977
978         status =
979             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
980         if (ACPI_SUCCESS(status)) {
981
982                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
983                 if (!data)
984                         return -ENOMEM;
985
986                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
987                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
988                 device->driver_data = data;
989
990                 data->device_id = device_id;
991                 data->video = video;
992                 data->dev = device;
993
994                 attribute = acpi_video_get_device_attr(video, device_id);
995
996                 if((attribute != NULL) && attribute->device_id_scheme) {
997                         switch (attribute->display_type) {
998                         case ACPI_VIDEO_DISPLAY_CRT:
999                                 data->flags.crt = 1;
1000                                 break;
1001                         case ACPI_VIDEO_DISPLAY_TV:
1002                                 data->flags.tvout = 1;
1003                                 break;
1004                         case ACPI_VIDEO_DISPLAY_DVI:
1005                                 data->flags.dvi = 1;
1006                                 break;
1007                         case ACPI_VIDEO_DISPLAY_LCD:
1008                                 data->flags.lcd = 1;
1009                                 break;
1010                         default:
1011                                 data->flags.unknown = 1;
1012                                 break;
1013                         }
1014                         if(attribute->bios_can_detect)
1015                                 data->flags.bios = 1;
1016                 } else {
1017                         /* Check for legacy IDs */
1018                         device_type = acpi_video_get_device_type(video,
1019                                                                  device_id);
1020                         /* Ignore bits 16 and 18-20 */
1021                         switch (device_type & 0xffe2ffff) {
1022                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1023                                 data->flags.crt = 1;
1024                                 break;
1025                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1026                                 data->flags.lcd = 1;
1027                                 break;
1028                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1029                                 data->flags.tvout = 1;
1030                                 break;
1031                         default:
1032                                 data->flags.unknown = 1;
1033                         }
1034                 }
1035
1036                 acpi_video_device_bind(video, data);
1037                 acpi_video_device_find_cap(data);
1038
1039                 status = acpi_install_notify_handler(device->handle,
1040                                                      ACPI_DEVICE_NOTIFY,
1041                                                      acpi_video_device_notify,
1042                                                      data);
1043                 if (ACPI_FAILURE(status)) {
1044                         printk(KERN_ERR PREFIX
1045                                           "Error installing notify handler\n");
1046                         if(data->brightness)
1047                                 kfree(data->brightness->levels);
1048                         kfree(data->brightness);
1049                         kfree(data);
1050                         return -ENODEV;
1051                 }
1052
1053                 mutex_lock(&video->device_list_lock);
1054                 list_add_tail(&data->entry, &video->video_device_list);
1055                 mutex_unlock(&video->device_list_lock);
1056
1057                 return 0;
1058         }
1059
1060         return -ENOENT;
1061 }
1062
1063 /*
1064  *  Arg:
1065  *      video   : video bus device 
1066  *
1067  *  Return:
1068  *      none
1069  *  
1070  *  Enumerate the video device list of the video bus, 
1071  *  bind the ids with the corresponding video devices
1072  *  under the video bus.
1073  */
1074
1075 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1076 {
1077         struct acpi_video_device *dev;
1078
1079         mutex_lock(&video->device_list_lock);
1080
1081         list_for_each_entry(dev, &video->video_device_list, entry)
1082                 acpi_video_device_bind(video, dev);
1083
1084         mutex_unlock(&video->device_list_lock);
1085 }
1086
1087 /*
1088  *  Arg:
1089  *      video   : video bus device 
1090  *      device  : video output device under the video 
1091  *              bus
1092  *
1093  *  Return:
1094  *      none
1095  *  
1096  *  Bind the ids with the corresponding video devices
1097  *  under the video bus.
1098  */
1099
1100 static void
1101 acpi_video_device_bind(struct acpi_video_bus *video,
1102                        struct acpi_video_device *device)
1103 {
1104         struct acpi_video_enumerated_device *ids;
1105         int i;
1106
1107         for (i = 0; i < video->attached_count; i++) {
1108                 ids = &video->attached_array[i];
1109                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1110                         ids->bind_info = device;
1111                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1112                 }
1113         }
1114 }
1115
1116 /*
1117  *  Arg:
1118  *      video   : video bus device 
1119  *
1120  *  Return:
1121  *      < 0     : error
1122  *  
1123  *  Call _DOD to enumerate all devices attached to display adapter
1124  *
1125  */
1126
1127 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1128 {
1129         int status;
1130         int count;
1131         int i;
1132         struct acpi_video_enumerated_device *active_list;
1133         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1134         union acpi_object *dod = NULL;
1135         union acpi_object *obj;
1136
1137         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1138         if (!ACPI_SUCCESS(status)) {
1139                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1140                 return status;
1141         }
1142
1143         dod = buffer.pointer;
1144         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1145                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1146                 status = -EFAULT;
1147                 goto out;
1148         }
1149
1150         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1151                           dod->package.count));
1152
1153         active_list = kcalloc(1 + dod->package.count,
1154                               sizeof(struct acpi_video_enumerated_device),
1155                               GFP_KERNEL);
1156         if (!active_list) {
1157                 status = -ENOMEM;
1158                 goto out;
1159         }
1160
1161         count = 0;
1162         for (i = 0; i < dod->package.count; i++) {
1163                 obj = &dod->package.elements[i];
1164
1165                 if (obj->type != ACPI_TYPE_INTEGER) {
1166                         printk(KERN_ERR PREFIX
1167                                 "Invalid _DOD data in element %d\n", i);
1168                         continue;
1169                 }
1170
1171                 active_list[count].value.int_val = obj->integer.value;
1172                 active_list[count].bind_info = NULL;
1173                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1174                                   (int)obj->integer.value));
1175                 count++;
1176         }
1177
1178         kfree(video->attached_array);
1179
1180         video->attached_array = active_list;
1181         video->attached_count = count;
1182
1183  out:
1184         kfree(buffer.pointer);
1185         return status;
1186 }
1187
1188 static int
1189 acpi_video_get_next_level(struct acpi_video_device *device,
1190                           u32 level_current, u32 event)
1191 {
1192         int min, max, min_above, max_below, i, l, delta = 255;
1193         max = max_below = 0;
1194         min = min_above = 255;
1195         /* Find closest level to level_current */
1196         for (i = 2; i < device->brightness->count; i++) {
1197                 l = device->brightness->levels[i];
1198                 if (abs(l - level_current) < abs(delta)) {
1199                         delta = l - level_current;
1200                         if (!delta)
1201                                 break;
1202                 }
1203         }
1204         /* Ajust level_current to closest available level */
1205         level_current += delta;
1206         for (i = 2; i < device->brightness->count; i++) {
1207                 l = device->brightness->levels[i];
1208                 if (l < min)
1209                         min = l;
1210                 if (l > max)
1211                         max = l;
1212                 if (l < min_above && l > level_current)
1213                         min_above = l;
1214                 if (l > max_below && l < level_current)
1215                         max_below = l;
1216         }
1217
1218         switch (event) {
1219         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1220                 return (level_current < max) ? min_above : min;
1221         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1222                 return (level_current < max) ? min_above : max;
1223         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1224                 return (level_current > min) ? max_below : min;
1225         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1226         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1227                 return 0;
1228         default:
1229                 return level_current;
1230         }
1231 }
1232
1233 static int
1234 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1235 {
1236         unsigned long long level_current, level_next;
1237         int result = -EINVAL;
1238
1239         /* no warning message if acpi_backlight=vendor is used */
1240         if (!acpi_video_backlight_support())
1241                 return 0;
1242
1243         if (!device->brightness)
1244                 goto out;
1245
1246         result = acpi_video_device_lcd_get_level_current(device,
1247                                                          &level_current, 0);
1248         if (result)
1249                 goto out;
1250
1251         level_next = acpi_video_get_next_level(device, level_current, event);
1252
1253         result = acpi_video_device_lcd_set_level(device, level_next);
1254
1255         if (!result)
1256                 backlight_force_update(device->backlight,
1257                                        BACKLIGHT_UPDATE_HOTKEY);
1258
1259 out:
1260         if (result)
1261                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1262
1263         return result;
1264 }
1265
1266 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1267                         void **edid)
1268 {
1269         struct acpi_video_bus *video;
1270         struct acpi_video_device *video_device;
1271         union acpi_object *buffer = NULL;
1272         acpi_status status;
1273         int i, length;
1274
1275         if (!device || !acpi_driver_data(device))
1276                 return -EINVAL;
1277
1278         video = acpi_driver_data(device);
1279
1280         for (i = 0; i < video->attached_count; i++) {
1281                 video_device = video->attached_array[i].bind_info;
1282                 length = 256;
1283
1284                 if (!video_device)
1285                         continue;
1286
1287                 if (!video_device->cap._DDC)
1288                         continue;
1289
1290                 if (type) {
1291                         switch (type) {
1292                         case ACPI_VIDEO_DISPLAY_CRT:
1293                                 if (!video_device->flags.crt)
1294                                         continue;
1295                                 break;
1296                         case ACPI_VIDEO_DISPLAY_TV:
1297                                 if (!video_device->flags.tvout)
1298                                         continue;
1299                                 break;
1300                         case ACPI_VIDEO_DISPLAY_DVI:
1301                                 if (!video_device->flags.dvi)
1302                                         continue;
1303                                 break;
1304                         case ACPI_VIDEO_DISPLAY_LCD:
1305                                 if (!video_device->flags.lcd)
1306                                         continue;
1307                                 break;
1308                         }
1309                 } else if (video_device->device_id != device_id) {
1310                         continue;
1311                 }
1312
1313                 status = acpi_video_device_EDID(video_device, &buffer, length);
1314
1315                 if (ACPI_FAILURE(status) || !buffer ||
1316                     buffer->type != ACPI_TYPE_BUFFER) {
1317                         length = 128;
1318                         status = acpi_video_device_EDID(video_device, &buffer,
1319                                                         length);
1320                         if (ACPI_FAILURE(status) || !buffer ||
1321                             buffer->type != ACPI_TYPE_BUFFER) {
1322                                 continue;
1323                         }
1324                 }
1325
1326                 *edid = buffer->buffer.pointer;
1327                 return length;
1328         }
1329
1330         return -ENODEV;
1331 }
1332 EXPORT_SYMBOL(acpi_video_get_edid);
1333
1334 static int
1335 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1336                            struct acpi_device *device)
1337 {
1338         int status = 0;
1339         struct acpi_device *dev;
1340
1341         acpi_video_device_enumerate(video);
1342
1343         list_for_each_entry(dev, &device->children, node) {
1344
1345                 status = acpi_video_bus_get_one_device(dev, video);
1346                 if (ACPI_FAILURE(status)) {
1347                         printk(KERN_WARNING PREFIX
1348                                         "Cant attach device\n");
1349                         continue;
1350                 }
1351         }
1352         return status;
1353 }
1354
1355 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1356 {
1357         acpi_status status;
1358
1359         if (!device || !device->video)
1360                 return -ENOENT;
1361
1362         status = acpi_remove_notify_handler(device->dev->handle,
1363                                             ACPI_DEVICE_NOTIFY,
1364                                             acpi_video_device_notify);
1365         if (ACPI_FAILURE(status)) {
1366                 printk(KERN_WARNING PREFIX
1367                        "Cant remove video notify handler\n");
1368         }
1369         if (device->backlight) {
1370                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
1371                 backlight_device_unregister(device->backlight);
1372                 device->backlight = NULL;
1373         }
1374         if (device->cooling_dev) {
1375                 sysfs_remove_link(&device->dev->dev.kobj,
1376                                   "thermal_cooling");
1377                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1378                                   "device");
1379                 thermal_cooling_device_unregister(device->cooling_dev);
1380                 device->cooling_dev = NULL;
1381         }
1382
1383         return 0;
1384 }
1385
1386 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1387 {
1388         int status;
1389         struct acpi_video_device *dev, *next;
1390
1391         mutex_lock(&video->device_list_lock);
1392
1393         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1394
1395                 status = acpi_video_bus_put_one_device(dev);
1396                 if (ACPI_FAILURE(status))
1397                         printk(KERN_WARNING PREFIX
1398                                "hhuuhhuu bug in acpi video driver.\n");
1399
1400                 if (dev->brightness) {
1401                         kfree(dev->brightness->levels);
1402                         kfree(dev->brightness);
1403                 }
1404                 list_del(&dev->entry);
1405                 kfree(dev);
1406         }
1407
1408         mutex_unlock(&video->device_list_lock);
1409
1410         return 0;
1411 }
1412
1413 /* acpi_video interface */
1414
1415 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1416 {
1417         return acpi_video_bus_DOS(video, 0, 0);
1418 }
1419
1420 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1421 {
1422         return acpi_video_bus_DOS(video, 0, 1);
1423 }
1424
1425 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1426 {
1427         struct acpi_video_bus *video = acpi_driver_data(device);
1428         struct input_dev *input;
1429         int keycode = 0;
1430
1431         if (!video)
1432                 return;
1433
1434         input = video->input;
1435
1436         switch (event) {
1437         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1438                                          * most likely via hotkey. */
1439                 acpi_bus_generate_proc_event(device, event, 0);
1440                 keycode = KEY_SWITCHVIDEOMODE;
1441                 break;
1442
1443         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1444                                          * connector. */
1445                 acpi_video_device_enumerate(video);
1446                 acpi_video_device_rebind(video);
1447                 acpi_bus_generate_proc_event(device, event, 0);
1448                 keycode = KEY_SWITCHVIDEOMODE;
1449                 break;
1450
1451         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1452                 acpi_bus_generate_proc_event(device, event, 0);
1453                 keycode = KEY_SWITCHVIDEOMODE;
1454                 break;
1455         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1456                 acpi_bus_generate_proc_event(device, event, 0);
1457                 keycode = KEY_VIDEO_NEXT;
1458                 break;
1459         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1460                 acpi_bus_generate_proc_event(device, event, 0);
1461                 keycode = KEY_VIDEO_PREV;
1462                 break;
1463
1464         default:
1465                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1466                                   "Unsupported event [0x%x]\n", event));
1467                 break;
1468         }
1469
1470         acpi_notifier_call_chain(device, event, 0);
1471
1472         if (keycode) {
1473                 input_report_key(input, keycode, 1);
1474                 input_sync(input);
1475                 input_report_key(input, keycode, 0);
1476                 input_sync(input);
1477         }
1478
1479         return;
1480 }
1481
1482 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1483 {
1484         struct acpi_video_device *video_device = data;
1485         struct acpi_device *device = NULL;
1486         struct acpi_video_bus *bus;
1487         struct input_dev *input;
1488         int keycode = 0;
1489
1490         if (!video_device)
1491                 return;
1492
1493         device = video_device->dev;
1494         bus = video_device->video;
1495         input = bus->input;
1496
1497         switch (event) {
1498         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1499                 if (brightness_switch_enabled)
1500                         acpi_video_switch_brightness(video_device, event);
1501                 acpi_bus_generate_proc_event(device, event, 0);
1502                 keycode = KEY_BRIGHTNESS_CYCLE;
1503                 break;
1504         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1505                 if (brightness_switch_enabled)
1506                         acpi_video_switch_brightness(video_device, event);
1507                 acpi_bus_generate_proc_event(device, event, 0);
1508                 keycode = KEY_BRIGHTNESSUP;
1509                 break;
1510         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1511                 if (brightness_switch_enabled)
1512                         acpi_video_switch_brightness(video_device, event);
1513                 acpi_bus_generate_proc_event(device, event, 0);
1514                 keycode = KEY_BRIGHTNESSDOWN;
1515                 break;
1516         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1517                 if (brightness_switch_enabled)
1518                         acpi_video_switch_brightness(video_device, event);
1519                 acpi_bus_generate_proc_event(device, event, 0);
1520                 keycode = KEY_BRIGHTNESS_ZERO;
1521                 break;
1522         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1523                 if (brightness_switch_enabled)
1524                         acpi_video_switch_brightness(video_device, event);
1525                 acpi_bus_generate_proc_event(device, event, 0);
1526                 keycode = KEY_DISPLAY_OFF;
1527                 break;
1528         default:
1529                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1530                                   "Unsupported event [0x%x]\n", event));
1531                 break;
1532         }
1533
1534         acpi_notifier_call_chain(device, event, 0);
1535
1536         if (keycode) {
1537                 input_report_key(input, keycode, 1);
1538                 input_sync(input);
1539                 input_report_key(input, keycode, 0);
1540                 input_sync(input);
1541         }
1542
1543         return;
1544 }
1545
1546 static int acpi_video_resume(struct notifier_block *nb,
1547                                 unsigned long val, void *ign)
1548 {
1549         struct acpi_video_bus *video;
1550         struct acpi_video_device *video_device;
1551         int i;
1552
1553         switch (val) {
1554         case PM_HIBERNATION_PREPARE:
1555         case PM_SUSPEND_PREPARE:
1556         case PM_RESTORE_PREPARE:
1557                 return NOTIFY_DONE;
1558         }
1559
1560         video = container_of(nb, struct acpi_video_bus, pm_nb);
1561
1562         dev_info(&video->device->dev, "Restoring backlight state\n");
1563
1564         for (i = 0; i < video->attached_count; i++) {
1565                 video_device = video->attached_array[i].bind_info;
1566                 if (video_device && video_device->backlight)
1567                         acpi_video_set_brightness(video_device->backlight);
1568         }
1569
1570         return NOTIFY_OK;
1571 }
1572
1573 static acpi_status
1574 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1575                         void **return_value)
1576 {
1577         struct acpi_device *device = context;
1578         struct acpi_device *sibling;
1579         int result;
1580
1581         if (handle == device->handle)
1582                 return AE_CTRL_TERMINATE;
1583
1584         result = acpi_bus_get_device(handle, &sibling);
1585         if (result)
1586                 return AE_OK;
1587
1588         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1589                         return AE_ALREADY_EXISTS;
1590
1591         return AE_OK;
1592 }
1593
1594 static int instance;
1595
1596 static int acpi_video_bus_add(struct acpi_device *device)
1597 {
1598         struct acpi_video_bus *video;
1599         struct input_dev *input;
1600         int error;
1601         acpi_status status;
1602
1603         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1604                                 device->parent->handle, 1,
1605                                 acpi_video_bus_match, NULL,
1606                                 device, NULL);
1607         if (status == AE_ALREADY_EXISTS) {
1608                 printk(KERN_WARNING FW_BUG
1609                         "Duplicate ACPI video bus devices for the"
1610                         " same VGA controller, please try module "
1611                         "parameter \"video.allow_duplicates=1\""
1612                         "if the current driver doesn't work.\n");
1613                 if (!allow_duplicates)
1614                         return -ENODEV;
1615         }
1616
1617         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1618         if (!video)
1619                 return -ENOMEM;
1620
1621         /* a hack to fix the duplicate name "VID" problem on T61 */
1622         if (!strcmp(device->pnp.bus_id, "VID")) {
1623                 if (instance)
1624                         device->pnp.bus_id[3] = '0' + instance;
1625                 instance ++;
1626         }
1627         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1628         if (!strcmp(device->pnp.bus_id, "VGA")) {
1629                 if (instance)
1630                         device->pnp.bus_id[3] = '0' + instance;
1631                 instance++;
1632         }
1633
1634         video->device = device;
1635         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1636         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1637         device->driver_data = video;
1638
1639         acpi_video_bus_find_cap(video);
1640         error = acpi_video_bus_check(video);
1641         if (error)
1642                 goto err_free_video;
1643
1644         mutex_init(&video->device_list_lock);
1645         INIT_LIST_HEAD(&video->video_device_list);
1646
1647         acpi_video_bus_get_devices(video, device);
1648         acpi_video_bus_start_devices(video);
1649
1650         video->input = input = input_allocate_device();
1651         if (!input) {
1652                 error = -ENOMEM;
1653                 goto err_stop_video;
1654         }
1655
1656         snprintf(video->phys, sizeof(video->phys),
1657                 "%s/video/input0", acpi_device_hid(video->device));
1658
1659         input->name = acpi_device_name(video->device);
1660         input->phys = video->phys;
1661         input->id.bustype = BUS_HOST;
1662         input->id.product = 0x06;
1663         input->dev.parent = &device->dev;
1664         input->evbit[0] = BIT(EV_KEY);
1665         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1666         set_bit(KEY_VIDEO_NEXT, input->keybit);
1667         set_bit(KEY_VIDEO_PREV, input->keybit);
1668         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1669         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1670         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1671         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1672         set_bit(KEY_DISPLAY_OFF, input->keybit);
1673
1674         error = input_register_device(input);
1675         if (error)
1676                 goto err_free_input_dev;
1677
1678         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1679                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1680                video->flags.multihead ? "yes" : "no",
1681                video->flags.rom ? "yes" : "no",
1682                video->flags.post ? "yes" : "no");
1683
1684         video->pm_nb.notifier_call = acpi_video_resume;
1685         video->pm_nb.priority = 0;
1686         register_pm_notifier(&video->pm_nb);
1687
1688         return 0;
1689
1690  err_free_input_dev:
1691         input_free_device(input);
1692  err_stop_video:
1693         acpi_video_bus_stop_devices(video);
1694         acpi_video_bus_put_devices(video);
1695         kfree(video->attached_array);
1696  err_free_video:
1697         kfree(video);
1698         device->driver_data = NULL;
1699
1700         return error;
1701 }
1702
1703 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1704 {
1705         struct acpi_video_bus *video = NULL;
1706
1707
1708         if (!device || !acpi_driver_data(device))
1709                 return -EINVAL;
1710
1711         video = acpi_driver_data(device);
1712
1713         unregister_pm_notifier(&video->pm_nb);
1714
1715         acpi_video_bus_stop_devices(video);
1716         acpi_video_bus_put_devices(video);
1717
1718         input_unregister_device(video->input);
1719         kfree(video->attached_array);
1720         kfree(video);
1721
1722         return 0;
1723 }
1724
1725 static int __init intel_opregion_present(void)
1726 {
1727 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1728         struct pci_dev *dev = NULL;
1729         u32 address;
1730
1731         for_each_pci_dev(dev) {
1732                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1733                         continue;
1734                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1735                         continue;
1736                 pci_read_config_dword(dev, 0xfc, &address);
1737                 if (!address)
1738                         continue;
1739                 return 1;
1740         }
1741 #endif
1742         return 0;
1743 }
1744
1745 int acpi_video_register(void)
1746 {
1747         int result = 0;
1748         if (register_count) {
1749                 /*
1750                  * if the function of acpi_video_register is already called,
1751                  * don't register the acpi_vide_bus again and return no error.
1752                  */
1753                 return 0;
1754         }
1755
1756         result = acpi_bus_register_driver(&acpi_video_bus);
1757         if (result < 0)
1758                 return -ENODEV;
1759
1760         /*
1761          * When the acpi_video_bus is loaded successfully, increase
1762          * the counter reference.
1763          */
1764         register_count = 1;
1765
1766         return 0;
1767 }
1768 EXPORT_SYMBOL(acpi_video_register);
1769
1770 void acpi_video_unregister(void)
1771 {
1772         if (!register_count) {
1773                 /*
1774                  * If the acpi video bus is already unloaded, don't
1775                  * unload it again and return directly.
1776                  */
1777                 return;
1778         }
1779         acpi_bus_unregister_driver(&acpi_video_bus);
1780
1781         register_count = 0;
1782
1783         return;
1784 }
1785 EXPORT_SYMBOL(acpi_video_unregister);
1786
1787 /*
1788  * This is kind of nasty. Hardware using Intel chipsets may require
1789  * the video opregion code to be run first in order to initialise
1790  * state before any ACPI video calls are made. To handle this we defer
1791  * registration of the video class until the opregion code has run.
1792  */
1793
1794 static int __init acpi_video_init(void)
1795 {
1796         dmi_check_system(video_dmi_table);
1797
1798         if (intel_opregion_present())
1799                 return 0;
1800
1801         return acpi_video_register();
1802 }
1803
1804 static void __exit acpi_video_exit(void)
1805 {
1806         acpi_video_unregister();
1807
1808         return;
1809 }
1810
1811 module_init(acpi_video_init);
1812 module_exit(acpi_video_exit);