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