]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/acpi/video.c
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[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/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <asm/uaccess.h>
40
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43
44 #define ACPI_VIDEO_COMPONENT            0x08000000
45 #define ACPI_VIDEO_CLASS                "video"
46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
53
54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
59
60 #define MAX_NAME_LEN    20
61
62 #define ACPI_VIDEO_DISPLAY_CRT  1
63 #define ACPI_VIDEO_DISPLAY_TV   2
64 #define ACPI_VIDEO_DISPLAY_DVI  3
65 #define ACPI_VIDEO_DISPLAY_LCD  4
66
67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
69
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
73
74 static int brightness_switch_enabled = 1;
75 module_param(brightness_switch_enabled, bool, 0644);
76
77 static int acpi_video_bus_add(struct acpi_device *device);
78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
79 static int acpi_video_resume(struct acpi_device *device);
80
81 static const struct acpi_device_id video_device_ids[] = {
82         {ACPI_VIDEO_HID, 0},
83         {"", 0},
84 };
85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
86
87 static struct acpi_driver acpi_video_bus = {
88         .name = "video",
89         .class = ACPI_VIDEO_CLASS,
90         .ids = video_device_ids,
91         .ops = {
92                 .add = acpi_video_bus_add,
93                 .remove = acpi_video_bus_remove,
94                 .resume = acpi_video_resume,
95                 },
96 };
97
98 struct acpi_video_bus_flags {
99         u8 multihead:1;         /* can switch video heads */
100         u8 rom:1;               /* can retrieve a video rom */
101         u8 post:1;              /* can configure the head to */
102         u8 reserved:5;
103 };
104
105 struct acpi_video_bus_cap {
106         u8 _DOS:1;              /*Enable/Disable output switching */
107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
108         u8 _ROM:1;              /*Get ROM Data */
109         u8 _GPD:1;              /*Get POST Device */
110         u8 _SPD:1;              /*Set POST Device */
111         u8 _VPO:1;              /*Video POST Options */
112         u8 reserved:2;
113 };
114
115 struct acpi_video_device_attrib {
116         u32 display_index:4;    /* A zero-based instance of the Display */
117         u32 display_port_attachment:4;  /*This field differentiates the display type */
118         u32 display_type:4;     /*Describe the specific type in use */
119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
120         u32 bios_can_detect:1;  /*BIOS can detect the device */
121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
122                                    the VGA device. */
123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
124         u32 reserved:10;        /*Must be 0 */
125         u32 device_id_scheme:1; /*Device ID Scheme */
126 };
127
128 struct acpi_video_enumerated_device {
129         union {
130                 u32 int_val;
131                 struct acpi_video_device_attrib attrib;
132         } value;
133         struct acpi_video_device *bind_info;
134 };
135
136 struct acpi_video_bus {
137         struct acpi_device *device;
138         u8 dos_setting;
139         struct acpi_video_enumerated_device *attached_array;
140         u8 attached_count;
141         struct acpi_video_bus_cap cap;
142         struct acpi_video_bus_flags flags;
143         struct list_head video_device_list;
144         struct mutex device_list_lock;  /* protects video_device_list */
145         struct proc_dir_entry *dir;
146         struct input_dev *input;
147         char phys[32];  /* for input device */
148 };
149
150 struct acpi_video_device_flags {
151         u8 crt:1;
152         u8 lcd:1;
153         u8 tvout:1;
154         u8 dvi:1;
155         u8 bios:1;
156         u8 unknown:1;
157         u8 reserved:2;
158 };
159
160 struct acpi_video_device_cap {
161         u8 _ADR:1;              /*Return the unique ID */
162         u8 _BCL:1;              /*Query list of brightness control levels supported */
163         u8 _BCM:1;              /*Set the brightness level */
164         u8 _BQC:1;              /* Get current brightness level */
165         u8 _DDC:1;              /*Return the EDID for this device */
166         u8 _DCS:1;              /*Return status of output device */
167         u8 _DGS:1;              /*Query graphics state */
168         u8 _DSS:1;              /*Device state set */
169 };
170
171 struct acpi_video_device_brightness {
172         int curr;
173         int count;
174         int *levels;
175 };
176
177 struct acpi_video_device {
178         unsigned long device_id;
179         struct acpi_video_device_flags flags;
180         struct acpi_video_device_cap cap;
181         struct list_head entry;
182         struct acpi_video_bus *video;
183         struct acpi_device *dev;
184         struct acpi_video_device_brightness *brightness;
185         struct backlight_device *backlight;
186         struct thermal_cooling_device *cdev;
187         struct output_device *output_dev;
188 };
189
190 /* bus */
191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
192 static struct file_operations acpi_video_bus_info_fops = {
193         .owner = THIS_MODULE,
194         .open = acpi_video_bus_info_open_fs,
195         .read = seq_read,
196         .llseek = seq_lseek,
197         .release = single_release,
198 };
199
200 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
201 static struct file_operations acpi_video_bus_ROM_fops = {
202         .owner = THIS_MODULE,
203         .open = acpi_video_bus_ROM_open_fs,
204         .read = seq_read,
205         .llseek = seq_lseek,
206         .release = single_release,
207 };
208
209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
210                                             struct file *file);
211 static struct file_operations acpi_video_bus_POST_info_fops = {
212         .owner = THIS_MODULE,
213         .open = acpi_video_bus_POST_info_open_fs,
214         .read = seq_read,
215         .llseek = seq_lseek,
216         .release = single_release,
217 };
218
219 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
220 static struct file_operations acpi_video_bus_POST_fops = {
221         .owner = THIS_MODULE,
222         .open = acpi_video_bus_POST_open_fs,
223         .read = seq_read,
224         .llseek = seq_lseek,
225         .release = single_release,
226 };
227
228 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
229 static struct file_operations acpi_video_bus_DOS_fops = {
230         .owner = THIS_MODULE,
231         .open = acpi_video_bus_DOS_open_fs,
232         .read = seq_read,
233         .llseek = seq_lseek,
234         .release = single_release,
235 };
236
237 /* device */
238 static int acpi_video_device_info_open_fs(struct inode *inode,
239                                           struct file *file);
240 static struct file_operations acpi_video_device_info_fops = {
241         .owner = THIS_MODULE,
242         .open = acpi_video_device_info_open_fs,
243         .read = seq_read,
244         .llseek = seq_lseek,
245         .release = single_release,
246 };
247
248 static int acpi_video_device_state_open_fs(struct inode *inode,
249                                            struct file *file);
250 static struct file_operations acpi_video_device_state_fops = {
251         .owner = THIS_MODULE,
252         .open = acpi_video_device_state_open_fs,
253         .read = seq_read,
254         .llseek = seq_lseek,
255         .release = single_release,
256 };
257
258 static int acpi_video_device_brightness_open_fs(struct inode *inode,
259                                                 struct file *file);
260 static struct file_operations acpi_video_device_brightness_fops = {
261         .owner = THIS_MODULE,
262         .open = acpi_video_device_brightness_open_fs,
263         .read = seq_read,
264         .llseek = seq_lseek,
265         .release = single_release,
266 };
267
268 static int acpi_video_device_EDID_open_fs(struct inode *inode,
269                                           struct file *file);
270 static struct file_operations acpi_video_device_EDID_fops = {
271         .owner = THIS_MODULE,
272         .open = acpi_video_device_EDID_open_fs,
273         .read = seq_read,
274         .llseek = seq_lseek,
275         .release = single_release,
276 };
277
278 static char device_decode[][30] = {
279         "motherboard VGA device",
280         "PCI VGA device",
281         "AGP VGA device",
282         "UNKNOWN",
283 };
284
285 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
286 static void acpi_video_device_rebind(struct acpi_video_bus *video);
287 static void acpi_video_device_bind(struct acpi_video_bus *video,
288                                    struct acpi_video_device *device);
289 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
290 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
291                         int level);
292 static int acpi_video_device_lcd_get_level_current(
293                         struct acpi_video_device *device,
294                         unsigned long *level);
295 static int acpi_video_get_next_level(struct acpi_video_device *device,
296                                      u32 level_current, u32 event);
297 static void acpi_video_switch_brightness(struct acpi_video_device *device,
298                                          int event);
299 static int acpi_video_device_get_state(struct acpi_video_device *device,
300                             unsigned long *state);
301 static int acpi_video_output_get(struct output_device *od);
302 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
303
304 /*backlight device sysfs support*/
305 static int acpi_video_get_brightness(struct backlight_device *bd)
306 {
307         unsigned long cur_level;
308         int i;
309         struct acpi_video_device *vd =
310                 (struct acpi_video_device *)bl_get_data(bd);
311         acpi_video_device_lcd_get_level_current(vd, &cur_level);
312         for (i = 2; i < vd->brightness->count; i++) {
313                 if (vd->brightness->levels[i] == cur_level)
314                         /* The first two entries are special - see page 575
315                            of the ACPI spec 3.0 */
316                         return i-2;
317         }
318         return 0;
319 }
320
321 static int acpi_video_set_brightness(struct backlight_device *bd)
322 {
323         int request_level = bd->props.brightness+2;
324         struct acpi_video_device *vd =
325                 (struct acpi_video_device *)bl_get_data(bd);
326         acpi_video_device_lcd_set_level(vd,
327                                         vd->brightness->levels[request_level]);
328         return 0;
329 }
330
331 static struct backlight_ops acpi_backlight_ops = {
332         .get_brightness = acpi_video_get_brightness,
333         .update_status  = acpi_video_set_brightness,
334 };
335
336 /*video output device sysfs support*/
337 static int acpi_video_output_get(struct output_device *od)
338 {
339         unsigned long state;
340         struct acpi_video_device *vd =
341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
342         acpi_video_device_get_state(vd, &state);
343         return (int)state;
344 }
345
346 static int acpi_video_output_set(struct output_device *od)
347 {
348         unsigned long state = od->request_state;
349         struct acpi_video_device *vd=
350                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
351         return acpi_video_device_set_state(vd, state);
352 }
353
354 static struct output_properties acpi_output_properties = {
355         .set_state = acpi_video_output_set,
356         .get_status = acpi_video_output_get,
357 };
358
359
360 /* thermal cooling device callbacks */
361 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
362 {
363         struct acpi_device *device = cdev->devdata;
364         struct acpi_video_device *video = acpi_driver_data(device);
365
366         return sprintf(buf, "%d\n", video->brightness->count - 3);
367 }
368
369 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
370 {
371         struct acpi_device *device = cdev->devdata;
372         struct acpi_video_device *video = acpi_driver_data(device);
373         unsigned long level;
374         int state;
375
376         acpi_video_device_lcd_get_level_current(video, &level);
377         for (state = 2; state < video->brightness->count; state++)
378                 if (level == video->brightness->levels[state])
379                         return sprintf(buf, "%d\n",
380                                        video->brightness->count - state - 1);
381
382         return -EINVAL;
383 }
384
385 static int
386 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
387 {
388         struct acpi_device *device = cdev->devdata;
389         struct acpi_video_device *video = acpi_driver_data(device);
390         int level;
391
392         if ( state >= video->brightness->count - 2)
393                 return -EINVAL;
394
395         state = video->brightness->count - state;
396         level = video->brightness->levels[state -1];
397         return acpi_video_device_lcd_set_level(video, level);
398 }
399
400 static struct thermal_cooling_device_ops video_cooling_ops = {
401         .get_max_state = video_get_max_state,
402         .get_cur_state = video_get_cur_state,
403         .set_cur_state = video_set_cur_state,
404 };
405
406 /* --------------------------------------------------------------------------
407                                Video Management
408    -------------------------------------------------------------------------- */
409
410 /* device */
411
412 static int
413 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
414 {
415         int status;
416
417         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
418
419         return status;
420 }
421
422 static int
423 acpi_video_device_get_state(struct acpi_video_device *device,
424                             unsigned long *state)
425 {
426         int status;
427
428         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
429
430         return status;
431 }
432
433 static int
434 acpi_video_device_set_state(struct acpi_video_device *device, int state)
435 {
436         int status;
437         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
438         struct acpi_object_list args = { 1, &arg0 };
439         unsigned long ret;
440
441
442         arg0.integer.value = state;
443         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
444
445         return status;
446 }
447
448 static int
449 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
450                                    union acpi_object **levels)
451 {
452         int status;
453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
454         union acpi_object *obj;
455
456
457         *levels = NULL;
458
459         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
460         if (!ACPI_SUCCESS(status))
461                 return status;
462         obj = (union acpi_object *)buffer.pointer;
463         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
464                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
465                 status = -EFAULT;
466                 goto err;
467         }
468
469         *levels = obj;
470
471         return 0;
472
473       err:
474         kfree(buffer.pointer);
475
476         return status;
477 }
478
479 static int
480 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
481 {
482         int status = AE_OK;
483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
484         struct acpi_object_list args = { 1, &arg0 };
485
486
487         arg0.integer.value = level;
488
489         if (device->cap._BCM)
490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
491                                               &args, NULL);
492         device->brightness->curr = level;
493         return status;
494 }
495
496 static int
497 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
498                                         unsigned long *level)
499 {
500         if (device->cap._BQC)
501                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
502                                              level);
503         *level = device->brightness->curr;
504         return AE_OK;
505 }
506
507 static int
508 acpi_video_device_EDID(struct acpi_video_device *device,
509                        union acpi_object **edid, ssize_t length)
510 {
511         int status;
512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
513         union acpi_object *obj;
514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
515         struct acpi_object_list args = { 1, &arg0 };
516
517
518         *edid = NULL;
519
520         if (!device)
521                 return -ENODEV;
522         if (length == 128)
523                 arg0.integer.value = 1;
524         else if (length == 256)
525                 arg0.integer.value = 2;
526         else
527                 return -EINVAL;
528
529         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
530         if (ACPI_FAILURE(status))
531                 return -ENODEV;
532
533         obj = buffer.pointer;
534
535         if (obj && obj->type == ACPI_TYPE_BUFFER)
536                 *edid = obj;
537         else {
538                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
539                 status = -EFAULT;
540                 kfree(obj);
541         }
542
543         return status;
544 }
545
546 /* bus */
547
548 static int
549 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
550 {
551         int status;
552         unsigned long tmp;
553         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
554         struct acpi_object_list args = { 1, &arg0 };
555
556
557         arg0.integer.value = option;
558
559         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
560         if (ACPI_SUCCESS(status))
561                 status = tmp ? (-EINVAL) : (AE_OK);
562
563         return status;
564 }
565
566 static int
567 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
568 {
569         int status;
570
571         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
572
573         return status;
574 }
575
576 static int
577 acpi_video_bus_POST_options(struct acpi_video_bus *video,
578                             unsigned long *options)
579 {
580         int status;
581
582         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
583         *options &= 3;
584
585         return status;
586 }
587
588 /*
589  *  Arg:
590  *      video           : video bus device pointer
591  *      bios_flag       : 
592  *              0.      The system BIOS should NOT automatically switch(toggle)
593  *                      the active display output.
594  *              1.      The system BIOS should automatically switch (toggle) the
595  *                      active display output. No switch event.
596  *              2.      The _DGS value should be locked.
597  *              3.      The system BIOS should not automatically switch (toggle) the
598  *                      active display output, but instead generate the display switch
599  *                      event notify code.
600  *      lcd_flag        :
601  *              0.      The system BIOS should automatically control the brightness level
602  *                      of the LCD when the power changes from AC to DC
603  *              1.      The system BIOS should NOT automatically control the brightness 
604  *                      level of the LCD when the power changes from AC to DC.
605  * Return Value:
606  *              -1      wrong arg.
607  */
608
609 static int
610 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
611 {
612         acpi_integer status = 0;
613         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
614         struct acpi_object_list args = { 1, &arg0 };
615
616
617         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
618                 status = -1;
619                 goto Failed;
620         }
621         arg0.integer.value = (lcd_flag << 2) | bios_flag;
622         video->dos_setting = arg0.integer.value;
623         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
624
625       Failed:
626         return status;
627 }
628
629 /*
630  *  Arg:        
631  *      device  : video output device (LCD, CRT, ..)
632  *
633  *  Return Value:
634  *      None
635  *
636  *  Find out all required AML methods defined under the output
637  *  device.
638  */
639
640 static void acpi_video_device_find_cap(struct acpi_video_device *device)
641 {
642         acpi_handle h_dummy1;
643         int i;
644         u32 max_level = 0;
645         union acpi_object *obj = NULL;
646         struct acpi_video_device_brightness *br = NULL;
647
648
649         memset(&device->cap, 0, sizeof(device->cap));
650
651         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
652                 device->cap._ADR = 1;
653         }
654         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
655                 device->cap._BCL = 1;
656         }
657         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
658                 device->cap._BCM = 1;
659         }
660         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
661                 device->cap._BQC = 1;
662         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
663                 device->cap._DDC = 1;
664         }
665         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
666                 device->cap._DCS = 1;
667         }
668         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
669                 device->cap._DGS = 1;
670         }
671         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
672                 device->cap._DSS = 1;
673         }
674
675         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
676
677                 if (obj->package.count >= 2) {
678                         int count = 0;
679                         union acpi_object *o;
680
681                         br = kzalloc(sizeof(*br), GFP_KERNEL);
682                         if (!br) {
683                                 printk(KERN_ERR "can't allocate memory\n");
684                         } else {
685                                 br->levels = kmalloc(obj->package.count *
686                                                      sizeof *(br->levels), GFP_KERNEL);
687                                 if (!br->levels)
688                                         goto out;
689
690                                 for (i = 0; i < obj->package.count; i++) {
691                                         o = (union acpi_object *)&obj->package.
692                                             elements[i];
693                                         if (o->type != ACPI_TYPE_INTEGER) {
694                                                 printk(KERN_ERR PREFIX "Invalid data\n");
695                                                 continue;
696                                         }
697                                         br->levels[count] = (u32) o->integer.value;
698
699                                         if (br->levels[count] > max_level)
700                                                 max_level = br->levels[count];
701                                         count++;
702                                 }
703                               out:
704                                 if (count < 2) {
705                                         kfree(br->levels);
706                                         kfree(br);
707                                 } else {
708                                         br->count = count;
709                                         device->brightness = br;
710                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
711                                                           "found %d brightness levels\n",
712                                                           count));
713                                 }
714                         }
715                 }
716
717         } else {
718                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
719         }
720
721         kfree(obj);
722
723         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
724                 int result;
725                 static int count = 0;
726                 char *name;
727                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
728                 if (!name)
729                         return;
730
731                 sprintf(name, "acpi_video%d", count++);
732                 device->backlight = backlight_device_register(name,
733                         NULL, device, &acpi_backlight_ops);
734                 device->backlight->props.max_brightness = device->brightness->count-3;
735                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
736                 backlight_update_status(device->backlight);
737                 kfree(name);
738
739                 device->cdev = thermal_cooling_device_register("LCD",
740                                         device->dev, &video_cooling_ops);
741                 if (IS_ERR(device->cdev))
742                         return;
743
744                 printk(KERN_INFO PREFIX
745                         "%s is registered as cooling_device%d\n",
746                         device->dev->dev.bus_id, device->cdev->id);
747                 result = sysfs_create_link(&device->dev->dev.kobj,
748                                 &device->cdev->device.kobj,
749                                 "thermal_cooling");
750                 if (result)
751                         printk(KERN_ERR PREFIX "Create sysfs link\n");
752                 result = sysfs_create_link(&device->cdev->device.kobj,
753                                 &device->dev->dev.kobj, "device");
754                 if (result)
755                         printk(KERN_ERR PREFIX "Create sysfs link\n");
756
757         }
758         if (device->cap._DCS && device->cap._DSS){
759                 static int count = 0;
760                 char *name;
761                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
762                 if (!name)
763                         return;
764                 sprintf(name, "acpi_video%d", count++);
765                 device->output_dev = video_output_register(name,
766                                 NULL, device, &acpi_output_properties);
767                 kfree(name);
768         }
769         return;
770 }
771
772 /*
773  *  Arg:        
774  *      device  : video output device (VGA)
775  *
776  *  Return Value:
777  *      None
778  *
779  *  Find out all required AML methods defined under the video bus device.
780  */
781
782 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
783 {
784         acpi_handle h_dummy1;
785
786         memset(&video->cap, 0, sizeof(video->cap));
787         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
788                 video->cap._DOS = 1;
789         }
790         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
791                 video->cap._DOD = 1;
792         }
793         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
794                 video->cap._ROM = 1;
795         }
796         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
797                 video->cap._GPD = 1;
798         }
799         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
800                 video->cap._SPD = 1;
801         }
802         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
803                 video->cap._VPO = 1;
804         }
805 }
806
807 /*
808  * Check whether the video bus device has required AML method to
809  * support the desired features
810  */
811
812 static int acpi_video_bus_check(struct acpi_video_bus *video)
813 {
814         acpi_status status = -ENOENT;
815
816
817         if (!video)
818                 return -EINVAL;
819
820         /* Since there is no HID, CID and so on for VGA driver, we have
821          * to check well known required nodes.
822          */
823
824         /* Does this device support video switching? */
825         if (video->cap._DOS) {
826                 video->flags.multihead = 1;
827                 status = 0;
828         }
829
830         /* Does this device support retrieving a video ROM? */
831         if (video->cap._ROM) {
832                 video->flags.rom = 1;
833                 status = 0;
834         }
835
836         /* Does this device support configuring which video device to POST? */
837         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
838                 video->flags.post = 1;
839                 status = 0;
840         }
841
842         return status;
843 }
844
845 /* --------------------------------------------------------------------------
846                               FS Interface (/proc)
847    -------------------------------------------------------------------------- */
848
849 static struct proc_dir_entry *acpi_video_dir;
850
851 /* video devices */
852
853 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
854 {
855         struct acpi_video_device *dev = seq->private;
856
857
858         if (!dev)
859                 goto end;
860
861         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
862         seq_printf(seq, "type:         ");
863         if (dev->flags.crt)
864                 seq_printf(seq, "CRT\n");
865         else if (dev->flags.lcd)
866                 seq_printf(seq, "LCD\n");
867         else if (dev->flags.tvout)
868                 seq_printf(seq, "TVOUT\n");
869         else if (dev->flags.dvi)
870                 seq_printf(seq, "DVI\n");
871         else
872                 seq_printf(seq, "UNKNOWN\n");
873
874         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
875
876       end:
877         return 0;
878 }
879
880 static int
881 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
882 {
883         return single_open(file, acpi_video_device_info_seq_show,
884                            PDE(inode)->data);
885 }
886
887 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
888 {
889         int status;
890         struct acpi_video_device *dev = seq->private;
891         unsigned long state;
892
893
894         if (!dev)
895                 goto end;
896
897         status = acpi_video_device_get_state(dev, &state);
898         seq_printf(seq, "state:     ");
899         if (ACPI_SUCCESS(status))
900                 seq_printf(seq, "0x%02lx\n", state);
901         else
902                 seq_printf(seq, "<not supported>\n");
903
904         status = acpi_video_device_query(dev, &state);
905         seq_printf(seq, "query:     ");
906         if (ACPI_SUCCESS(status))
907                 seq_printf(seq, "0x%02lx\n", state);
908         else
909                 seq_printf(seq, "<not supported>\n");
910
911       end:
912         return 0;
913 }
914
915 static int
916 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
917 {
918         return single_open(file, acpi_video_device_state_seq_show,
919                            PDE(inode)->data);
920 }
921
922 static ssize_t
923 acpi_video_device_write_state(struct file *file,
924                               const char __user * buffer,
925                               size_t count, loff_t * data)
926 {
927         int status;
928         struct seq_file *m = file->private_data;
929         struct acpi_video_device *dev = m->private;
930         char str[12] = { 0 };
931         u32 state = 0;
932
933
934         if (!dev || count + 1 > sizeof str)
935                 return -EINVAL;
936
937         if (copy_from_user(str, buffer, count))
938                 return -EFAULT;
939
940         str[count] = 0;
941         state = simple_strtoul(str, NULL, 0);
942         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
943
944         status = acpi_video_device_set_state(dev, state);
945
946         if (status)
947                 return -EFAULT;
948
949         return count;
950 }
951
952 static int
953 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
954 {
955         struct acpi_video_device *dev = seq->private;
956         int i;
957
958
959         if (!dev || !dev->brightness) {
960                 seq_printf(seq, "<not supported>\n");
961                 return 0;
962         }
963
964         seq_printf(seq, "levels: ");
965         for (i = 0; i < dev->brightness->count; i++)
966                 seq_printf(seq, " %d", dev->brightness->levels[i]);
967         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
968
969         return 0;
970 }
971
972 static int
973 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
974 {
975         return single_open(file, acpi_video_device_brightness_seq_show,
976                            PDE(inode)->data);
977 }
978
979 static ssize_t
980 acpi_video_device_write_brightness(struct file *file,
981                                    const char __user * buffer,
982                                    size_t count, loff_t * data)
983 {
984         struct seq_file *m = file->private_data;
985         struct acpi_video_device *dev = m->private;
986         char str[5] = { 0 };
987         unsigned int level = 0;
988         int i;
989
990
991         if (!dev || !dev->brightness || count + 1 > sizeof str)
992                 return -EINVAL;
993
994         if (copy_from_user(str, buffer, count))
995                 return -EFAULT;
996
997         str[count] = 0;
998         level = simple_strtoul(str, NULL, 0);
999
1000         if (level > 100)
1001                 return -EFAULT;
1002
1003         /* validate through the list of available levels */
1004         for (i = 0; i < dev->brightness->count; i++)
1005                 if (level == dev->brightness->levels[i]) {
1006                         if (ACPI_SUCCESS
1007                             (acpi_video_device_lcd_set_level(dev, level)))
1008                                 dev->brightness->curr = level;
1009                         break;
1010                 }
1011
1012         return count;
1013 }
1014
1015 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1016 {
1017         struct acpi_video_device *dev = seq->private;
1018         int status;
1019         int i;
1020         union acpi_object *edid = NULL;
1021
1022
1023         if (!dev)
1024                 goto out;
1025
1026         status = acpi_video_device_EDID(dev, &edid, 128);
1027         if (ACPI_FAILURE(status)) {
1028                 status = acpi_video_device_EDID(dev, &edid, 256);
1029         }
1030
1031         if (ACPI_FAILURE(status)) {
1032                 goto out;
1033         }
1034
1035         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1036                 for (i = 0; i < edid->buffer.length; i++)
1037                         seq_putc(seq, edid->buffer.pointer[i]);
1038         }
1039
1040       out:
1041         if (!edid)
1042                 seq_printf(seq, "<not supported>\n");
1043         else
1044                 kfree(edid);
1045
1046         return 0;
1047 }
1048
1049 static int
1050 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1051 {
1052         return single_open(file, acpi_video_device_EDID_seq_show,
1053                            PDE(inode)->data);
1054 }
1055
1056 static int acpi_video_device_add_fs(struct acpi_device *device)
1057 {
1058         struct proc_dir_entry *entry, *device_dir;
1059         struct acpi_video_device *vid_dev;
1060
1061         vid_dev = acpi_driver_data(device);
1062         if (!vid_dev)
1063                 return -ENODEV;
1064
1065         device_dir = proc_mkdir(acpi_device_bid(device),
1066                                 vid_dev->video->dir);
1067         if (!device_dir)
1068                 return -ENOMEM;
1069
1070         device_dir->owner = THIS_MODULE;
1071
1072         /* 'info' [R] */
1073         entry = proc_create_data("info", S_IRUGO, acpi_device_dir(device),
1074                         &acpi_video_device_info_fops, acpi_driver_data(device));
1075         if (!entry)
1076                 goto err_remove_dir;
1077
1078         /* 'state' [R/W] */
1079         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1080         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1081                                  acpi_device_dir(device),
1082                                  &acpi_video_device_state_fops,
1083                                  acpi_driver_data(device));
1084         if (!entry)
1085                 goto err_remove_info;
1086
1087         /* 'brightness' [R/W] */
1088         acpi_video_device_brightness_fops.write =
1089                 acpi_video_device_write_brightness;
1090         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1091                                  acpi_device_dir(device),
1092                                  &acpi_video_device_brightness_fops,
1093                                  acpi_driver_data(device));
1094         if (!entry)
1095                 goto err_remove_state;
1096
1097         /* 'EDID' [R] */
1098         entry = proc_create_data("EDID", S_IRUGO, acpi_device_dir(device),
1099                                  &acpi_video_device_EDID_fops,
1100                                  acpi_driver_data(device));
1101         if (!entry)
1102                 goto err_remove_brightness;
1103
1104         return 0;
1105
1106  err_remove_brightness:
1107         remove_proc_entry("brightness", device_dir);
1108  err_remove_state:
1109         remove_proc_entry("state", device_dir);
1110  err_remove_info:
1111         remove_proc_entry("info", device_dir);
1112  err_remove_dir:
1113         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1114         return -ENOMEM;
1115 }
1116
1117 static int acpi_video_device_remove_fs(struct acpi_device *device)
1118 {
1119         struct acpi_video_device *vid_dev;
1120         struct proc_dir_entry *device_dir;
1121
1122         vid_dev = acpi_driver_data(device);
1123         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1124                 return -ENODEV;
1125
1126         device_dir = acpi_device_dir(device);
1127         if (device_dir) {
1128                 remove_proc_entry("info", device_dir);
1129                 remove_proc_entry("state", device_dir);
1130                 remove_proc_entry("brightness", device_dir);
1131                 remove_proc_entry("EDID", device_dir);
1132                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1133                 acpi_device_dir(device) = NULL;
1134         }
1135
1136         return 0;
1137 }
1138
1139 /* video bus */
1140 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1141 {
1142         struct acpi_video_bus *video = seq->private;
1143
1144
1145         if (!video)
1146                 goto end;
1147
1148         seq_printf(seq, "Switching heads:              %s\n",
1149                    video->flags.multihead ? "yes" : "no");
1150         seq_printf(seq, "Video ROM:                    %s\n",
1151                    video->flags.rom ? "yes" : "no");
1152         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1153                    video->flags.post ? "yes" : "no");
1154
1155       end:
1156         return 0;
1157 }
1158
1159 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1160 {
1161         return single_open(file, acpi_video_bus_info_seq_show,
1162                            PDE(inode)->data);
1163 }
1164
1165 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1166 {
1167         struct acpi_video_bus *video = seq->private;
1168
1169
1170         if (!video)
1171                 goto end;
1172
1173         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1174         seq_printf(seq, "<TODO>\n");
1175
1176       end:
1177         return 0;
1178 }
1179
1180 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1181 {
1182         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1183 }
1184
1185 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1186 {
1187         struct acpi_video_bus *video = seq->private;
1188         unsigned long options;
1189         int status;
1190
1191
1192         if (!video)
1193                 goto end;
1194
1195         status = acpi_video_bus_POST_options(video, &options);
1196         if (ACPI_SUCCESS(status)) {
1197                 if (!(options & 1)) {
1198                         printk(KERN_WARNING PREFIX
1199                                "The motherboard VGA device is not listed as a possible POST device.\n");
1200                         printk(KERN_WARNING PREFIX
1201                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1202                 }
1203                 printk("%lx\n", options);
1204                 seq_printf(seq, "can POST: <integrated video>");
1205                 if (options & 2)
1206                         seq_printf(seq, " <PCI video>");
1207                 if (options & 4)
1208                         seq_printf(seq, " <AGP video>");
1209                 seq_putc(seq, '\n');
1210         } else
1211                 seq_printf(seq, "<not supported>\n");
1212       end:
1213         return 0;
1214 }
1215
1216 static int
1217 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1218 {
1219         return single_open(file, acpi_video_bus_POST_info_seq_show,
1220                            PDE(inode)->data);
1221 }
1222
1223 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1224 {
1225         struct acpi_video_bus *video = seq->private;
1226         int status;
1227         unsigned long id;
1228
1229
1230         if (!video)
1231                 goto end;
1232
1233         status = acpi_video_bus_get_POST(video, &id);
1234         if (!ACPI_SUCCESS(status)) {
1235                 seq_printf(seq, "<not supported>\n");
1236                 goto end;
1237         }
1238         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1239
1240       end:
1241         return 0;
1242 }
1243
1244 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1245 {
1246         struct acpi_video_bus *video = seq->private;
1247
1248
1249         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1250
1251         return 0;
1252 }
1253
1254 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1255 {
1256         return single_open(file, acpi_video_bus_POST_seq_show,
1257                            PDE(inode)->data);
1258 }
1259
1260 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1261 {
1262         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1263 }
1264
1265 static ssize_t
1266 acpi_video_bus_write_POST(struct file *file,
1267                           const char __user * buffer,
1268                           size_t count, loff_t * data)
1269 {
1270         int status;
1271         struct seq_file *m = file->private_data;
1272         struct acpi_video_bus *video = m->private;
1273         char str[12] = { 0 };
1274         unsigned long opt, options;
1275
1276
1277         if (!video || count + 1 > sizeof str)
1278                 return -EINVAL;
1279
1280         status = acpi_video_bus_POST_options(video, &options);
1281         if (!ACPI_SUCCESS(status))
1282                 return -EINVAL;
1283
1284         if (copy_from_user(str, buffer, count))
1285                 return -EFAULT;
1286
1287         str[count] = 0;
1288         opt = strtoul(str, NULL, 0);
1289         if (opt > 3)
1290                 return -EFAULT;
1291
1292         /* just in case an OEM 'forgot' the motherboard... */
1293         options |= 1;
1294
1295         if (options & (1ul << opt)) {
1296                 status = acpi_video_bus_set_POST(video, opt);
1297                 if (!ACPI_SUCCESS(status))
1298                         return -EFAULT;
1299
1300         }
1301
1302         return count;
1303 }
1304
1305 static ssize_t
1306 acpi_video_bus_write_DOS(struct file *file,
1307                          const char __user * buffer,
1308                          size_t count, loff_t * data)
1309 {
1310         int status;
1311         struct seq_file *m = file->private_data;
1312         struct acpi_video_bus *video = m->private;
1313         char str[12] = { 0 };
1314         unsigned long opt;
1315
1316
1317         if (!video || count + 1 > sizeof str)
1318                 return -EINVAL;
1319
1320         if (copy_from_user(str, buffer, count))
1321                 return -EFAULT;
1322
1323         str[count] = 0;
1324         opt = strtoul(str, NULL, 0);
1325         if (opt > 7)
1326                 return -EFAULT;
1327
1328         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1329
1330         if (!ACPI_SUCCESS(status))
1331                 return -EFAULT;
1332
1333         return count;
1334 }
1335
1336 static int acpi_video_bus_add_fs(struct acpi_device *device)
1337 {
1338         struct acpi_video_bus *video = acpi_driver_data(device);
1339         struct proc_dir_entry *device_dir;
1340         struct proc_dir_entry *entry;
1341
1342         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1343         if (!device_dir)
1344                 return -ENOMEM;
1345
1346         device_dir->owner = THIS_MODULE;
1347
1348         /* 'info' [R] */
1349         entry = proc_create_data("info", S_IRUGO, acpi_device_dir(device),
1350                                  &acpi_video_bus_info_fops,
1351                                  acpi_driver_data(device));
1352         if (!entry)
1353                 goto err_remove_dir;
1354
1355         /* 'ROM' [R] */
1356         entry = proc_create_data("ROM", S_IRUGO, acpi_device_dir(device),
1357                                  &acpi_video_bus_ROM_fops,
1358                                  acpi_driver_data(device));
1359         if (!entry)
1360                 goto err_remove_info;
1361
1362         /* 'POST_info' [R] */
1363         entry = proc_create_data("POST_info", S_IRUGO, acpi_device_dir(device),
1364                                  &acpi_video_bus_POST_info_fops,
1365                                  acpi_driver_data(device));
1366         if (!entry)
1367                 goto err_remove_rom;
1368
1369         /* 'POST' [R/W] */
1370         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1371         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1372                                  acpi_device_dir(device),
1373                                  &acpi_video_bus_POST_fops,
1374                                  acpi_driver_data(device));
1375         if (!entry)
1376                 goto err_remove_post_info;
1377
1378         /* 'DOS' [R/W] */
1379         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1380         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1381                                  acpi_device_dir(device),
1382                                  &acpi_video_bus_DOS_fops,
1383                                  acpi_driver_data(device));
1384         if (!entry)
1385                 goto err_remove_post;
1386
1387         video->dir = acpi_device_dir(device) = device_dir;
1388         return 0;
1389
1390  err_remove_post:
1391         remove_proc_entry("POST", device_dir);
1392  err_remove_post_info:
1393         remove_proc_entry("POST_info", device_dir);
1394  err_remove_rom:
1395         remove_proc_entry("ROM", device_dir);
1396  err_remove_info:
1397         remove_proc_entry("info", device_dir);
1398  err_remove_dir:
1399         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1400         return -ENOMEM;
1401 }
1402
1403 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1404 {
1405         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1406
1407         if (device_dir) {
1408                 remove_proc_entry("info", device_dir);
1409                 remove_proc_entry("ROM", device_dir);
1410                 remove_proc_entry("POST_info", device_dir);
1411                 remove_proc_entry("POST", device_dir);
1412                 remove_proc_entry("DOS", device_dir);
1413                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1414                 acpi_device_dir(device) = NULL;
1415         }
1416
1417         return 0;
1418 }
1419
1420 /* --------------------------------------------------------------------------
1421                                  Driver Interface
1422    -------------------------------------------------------------------------- */
1423
1424 /* device interface */
1425 static struct acpi_video_device_attrib*
1426 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1427 {
1428         struct acpi_video_enumerated_device *ids;
1429         int i;
1430
1431         for (i = 0; i < video->attached_count; i++) {
1432                 ids = &video->attached_array[i];
1433                 if ((ids->value.int_val & 0xffff) == device_id)
1434                         return &ids->value.attrib;
1435         }
1436
1437         return NULL;
1438 }
1439
1440 static int
1441 acpi_video_bus_get_one_device(struct acpi_device *device,
1442                               struct acpi_video_bus *video)
1443 {
1444         unsigned long device_id;
1445         int status;
1446         struct acpi_video_device *data;
1447         struct acpi_video_device_attrib* attribute;
1448
1449         if (!device || !video)
1450                 return -EINVAL;
1451
1452         status =
1453             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1454         if (ACPI_SUCCESS(status)) {
1455
1456                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1457                 if (!data)
1458                         return -ENOMEM;
1459
1460                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1461                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1462                 acpi_driver_data(device) = data;
1463
1464                 data->device_id = device_id;
1465                 data->video = video;
1466                 data->dev = device;
1467
1468                 attribute = acpi_video_get_device_attr(video, device_id);
1469
1470                 if((attribute != NULL) && attribute->device_id_scheme) {
1471                         switch (attribute->display_type) {
1472                         case ACPI_VIDEO_DISPLAY_CRT:
1473                                 data->flags.crt = 1;
1474                                 break;
1475                         case ACPI_VIDEO_DISPLAY_TV:
1476                                 data->flags.tvout = 1;
1477                                 break;
1478                         case ACPI_VIDEO_DISPLAY_DVI:
1479                                 data->flags.dvi = 1;
1480                                 break;
1481                         case ACPI_VIDEO_DISPLAY_LCD:
1482                                 data->flags.lcd = 1;
1483                                 break;
1484                         default:
1485                                 data->flags.unknown = 1;
1486                                 break;
1487                         }
1488                         if(attribute->bios_can_detect)
1489                                 data->flags.bios = 1;
1490                 } else
1491                         data->flags.unknown = 1;
1492
1493                 acpi_video_device_bind(video, data);
1494                 acpi_video_device_find_cap(data);
1495
1496                 status = acpi_install_notify_handler(device->handle,
1497                                                      ACPI_DEVICE_NOTIFY,
1498                                                      acpi_video_device_notify,
1499                                                      data);
1500                 if (ACPI_FAILURE(status)) {
1501                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1502                                           "Error installing notify handler\n"));
1503                         if(data->brightness)
1504                                 kfree(data->brightness->levels);
1505                         kfree(data->brightness);
1506                         kfree(data);
1507                         return -ENODEV;
1508                 }
1509
1510                 mutex_lock(&video->device_list_lock);
1511                 list_add_tail(&data->entry, &video->video_device_list);
1512                 mutex_unlock(&video->device_list_lock);
1513
1514                 acpi_video_device_add_fs(device);
1515
1516                 return 0;
1517         }
1518
1519         return -ENOENT;
1520 }
1521
1522 /*
1523  *  Arg:
1524  *      video   : video bus device 
1525  *
1526  *  Return:
1527  *      none
1528  *  
1529  *  Enumerate the video device list of the video bus, 
1530  *  bind the ids with the corresponding video devices
1531  *  under the video bus.
1532  */
1533
1534 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1535 {
1536         struct acpi_video_device *dev;
1537
1538         mutex_lock(&video->device_list_lock);
1539
1540         list_for_each_entry(dev, &video->video_device_list, entry)
1541                 acpi_video_device_bind(video, dev);
1542
1543         mutex_unlock(&video->device_list_lock);
1544 }
1545
1546 /*
1547  *  Arg:
1548  *      video   : video bus device 
1549  *      device  : video output device under the video 
1550  *              bus
1551  *
1552  *  Return:
1553  *      none
1554  *  
1555  *  Bind the ids with the corresponding video devices
1556  *  under the video bus.
1557  */
1558
1559 static void
1560 acpi_video_device_bind(struct acpi_video_bus *video,
1561                        struct acpi_video_device *device)
1562 {
1563         struct acpi_video_enumerated_device *ids;
1564         int i;
1565
1566         for (i = 0; i < video->attached_count; i++) {
1567                 ids = &video->attached_array[i];
1568                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1569                         ids->bind_info = device;
1570                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1571                 }
1572         }
1573 }
1574
1575 /*
1576  *  Arg:
1577  *      video   : video bus device 
1578  *
1579  *  Return:
1580  *      < 0     : error
1581  *  
1582  *  Call _DOD to enumerate all devices attached to display adapter
1583  *
1584  */
1585
1586 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1587 {
1588         int status;
1589         int count;
1590         int i;
1591         struct acpi_video_enumerated_device *active_list;
1592         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1593         union acpi_object *dod = NULL;
1594         union acpi_object *obj;
1595
1596         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1597         if (!ACPI_SUCCESS(status)) {
1598                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1599                 return status;
1600         }
1601
1602         dod = buffer.pointer;
1603         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1604                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1605                 status = -EFAULT;
1606                 goto out;
1607         }
1608
1609         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1610                           dod->package.count));
1611
1612         active_list = kcalloc(1 + dod->package.count,
1613                               sizeof(struct acpi_video_enumerated_device),
1614                               GFP_KERNEL);
1615         if (!active_list) {
1616                 status = -ENOMEM;
1617                 goto out;
1618         }
1619
1620         count = 0;
1621         for (i = 0; i < dod->package.count; i++) {
1622                 obj = &dod->package.elements[i];
1623
1624                 if (obj->type != ACPI_TYPE_INTEGER) {
1625                         printk(KERN_ERR PREFIX
1626                                 "Invalid _DOD data in element %d\n", i);
1627                         continue;
1628                 }
1629
1630                 active_list[count].value.int_val = obj->integer.value;
1631                 active_list[count].bind_info = NULL;
1632                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1633                                   (int)obj->integer.value));
1634                 count++;
1635         }
1636
1637         kfree(video->attached_array);
1638
1639         video->attached_array = active_list;
1640         video->attached_count = count;
1641
1642  out:
1643         kfree(buffer.pointer);
1644         return status;
1645 }
1646
1647 static int
1648 acpi_video_get_next_level(struct acpi_video_device *device,
1649                           u32 level_current, u32 event)
1650 {
1651         int min, max, min_above, max_below, i, l, delta = 255;
1652         max = max_below = 0;
1653         min = min_above = 255;
1654         /* Find closest level to level_current */
1655         for (i = 0; i < device->brightness->count; i++) {
1656                 l = device->brightness->levels[i];
1657                 if (abs(l - level_current) < abs(delta)) {
1658                         delta = l - level_current;
1659                         if (!delta)
1660                                 break;
1661                 }
1662         }
1663         /* Ajust level_current to closest available level */
1664         level_current += delta;
1665         for (i = 0; i < device->brightness->count; i++) {
1666                 l = device->brightness->levels[i];
1667                 if (l < min)
1668                         min = l;
1669                 if (l > max)
1670                         max = l;
1671                 if (l < min_above && l > level_current)
1672                         min_above = l;
1673                 if (l > max_below && l < level_current)
1674                         max_below = l;
1675         }
1676
1677         switch (event) {
1678         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1679                 return (level_current < max) ? min_above : min;
1680         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1681                 return (level_current < max) ? min_above : max;
1682         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1683                 return (level_current > min) ? max_below : min;
1684         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1685         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1686                 return 0;
1687         default:
1688                 return level_current;
1689         }
1690 }
1691
1692 static void
1693 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1694 {
1695         unsigned long level_current, level_next;
1696         acpi_video_device_lcd_get_level_current(device, &level_current);
1697         level_next = acpi_video_get_next_level(device, level_current, event);
1698         acpi_video_device_lcd_set_level(device, level_next);
1699 }
1700
1701 static int
1702 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1703                            struct acpi_device *device)
1704 {
1705         int status = 0;
1706         struct acpi_device *dev;
1707
1708         acpi_video_device_enumerate(video);
1709
1710         list_for_each_entry(dev, &device->children, node) {
1711
1712                 status = acpi_video_bus_get_one_device(dev, video);
1713                 if (ACPI_FAILURE(status)) {
1714                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1715                         continue;
1716                 }
1717         }
1718         return status;
1719 }
1720
1721 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1722 {
1723         acpi_status status;
1724         struct acpi_video_bus *video;
1725
1726
1727         if (!device || !device->video)
1728                 return -ENOENT;
1729
1730         video = device->video;
1731
1732         acpi_video_device_remove_fs(device->dev);
1733
1734         status = acpi_remove_notify_handler(device->dev->handle,
1735                                             ACPI_DEVICE_NOTIFY,
1736                                             acpi_video_device_notify);
1737         backlight_device_unregister(device->backlight);
1738         if (device->cdev) {
1739                 sysfs_remove_link(&device->dev->dev.kobj,
1740                                   "thermal_cooling");
1741                 sysfs_remove_link(&device->cdev->device.kobj,
1742                                   "device");
1743                 thermal_cooling_device_unregister(device->cdev);
1744                 device->cdev = NULL;
1745         }
1746         video_output_unregister(device->output_dev);
1747
1748         return 0;
1749 }
1750
1751 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1752 {
1753         int status;
1754         struct acpi_video_device *dev, *next;
1755
1756         mutex_lock(&video->device_list_lock);
1757
1758         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1759
1760                 status = acpi_video_bus_put_one_device(dev);
1761                 if (ACPI_FAILURE(status))
1762                         printk(KERN_WARNING PREFIX
1763                                "hhuuhhuu bug in acpi video driver.\n");
1764
1765                 if (dev->brightness) {
1766                         kfree(dev->brightness->levels);
1767                         kfree(dev->brightness);
1768                 }
1769                 list_del(&dev->entry);
1770                 kfree(dev);
1771         }
1772
1773         mutex_unlock(&video->device_list_lock);
1774
1775         return 0;
1776 }
1777
1778 /* acpi_video interface */
1779
1780 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1781 {
1782         return acpi_video_bus_DOS(video, 0, 0);
1783 }
1784
1785 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1786 {
1787         return acpi_video_bus_DOS(video, 0, 1);
1788 }
1789
1790 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1791 {
1792         struct acpi_video_bus *video = data;
1793         struct acpi_device *device = NULL;
1794         struct input_dev *input;
1795         int keycode;
1796
1797         if (!video)
1798                 return;
1799
1800         device = video->device;
1801         input = video->input;
1802
1803         switch (event) {
1804         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1805                                          * most likely via hotkey. */
1806                 acpi_bus_generate_proc_event(device, event, 0);
1807                 keycode = KEY_SWITCHVIDEOMODE;
1808                 break;
1809
1810         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1811                                          * connector. */
1812                 acpi_video_device_enumerate(video);
1813                 acpi_video_device_rebind(video);
1814                 acpi_bus_generate_proc_event(device, event, 0);
1815                 keycode = KEY_SWITCHVIDEOMODE;
1816                 break;
1817
1818         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1819                 acpi_bus_generate_proc_event(device, event, 0);
1820                 keycode = KEY_SWITCHVIDEOMODE;
1821                 break;
1822         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1823                 acpi_bus_generate_proc_event(device, event, 0);
1824                 keycode = KEY_VIDEO_NEXT;
1825                 break;
1826         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1827                 acpi_bus_generate_proc_event(device, event, 0);
1828                 keycode = KEY_VIDEO_PREV;
1829                 break;
1830
1831         default:
1832                 keycode = KEY_UNKNOWN;
1833                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1834                                   "Unsupported event [0x%x]\n", event));
1835                 break;
1836         }
1837
1838         acpi_notifier_call_chain(device, event, 0);
1839         input_report_key(input, keycode, 1);
1840         input_sync(input);
1841         input_report_key(input, keycode, 0);
1842         input_sync(input);
1843
1844         return;
1845 }
1846
1847 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1848 {
1849         struct acpi_video_device *video_device = data;
1850         struct acpi_device *device = NULL;
1851         struct acpi_video_bus *bus;
1852         struct input_dev *input;
1853         int keycode;
1854
1855         if (!video_device)
1856                 return;
1857
1858         device = video_device->dev;
1859         bus = video_device->video;
1860         input = bus->input;
1861
1862         switch (event) {
1863         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1864                 if (brightness_switch_enabled)
1865                         acpi_video_switch_brightness(video_device, event);
1866                 acpi_bus_generate_proc_event(device, event, 0);
1867                 keycode = KEY_BRIGHTNESS_CYCLE;
1868                 break;
1869         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1870                 if (brightness_switch_enabled)
1871                         acpi_video_switch_brightness(video_device, event);
1872                 acpi_bus_generate_proc_event(device, event, 0);
1873                 keycode = KEY_BRIGHTNESSUP;
1874                 break;
1875         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1876                 if (brightness_switch_enabled)
1877                         acpi_video_switch_brightness(video_device, event);
1878                 acpi_bus_generate_proc_event(device, event, 0);
1879                 keycode = KEY_BRIGHTNESSDOWN;
1880                 break;
1881         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1882                 if (brightness_switch_enabled)
1883                         acpi_video_switch_brightness(video_device, event);
1884                 acpi_bus_generate_proc_event(device, event, 0);
1885                 keycode = KEY_BRIGHTNESS_ZERO;
1886                 break;
1887         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1888                 if (brightness_switch_enabled)
1889                         acpi_video_switch_brightness(video_device, event);
1890                 acpi_bus_generate_proc_event(device, event, 0);
1891                 keycode = KEY_DISPLAY_OFF;
1892                 break;
1893         default:
1894                 keycode = KEY_UNKNOWN;
1895                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1896                                   "Unsupported event [0x%x]\n", event));
1897                 break;
1898         }
1899
1900         acpi_notifier_call_chain(device, event, 0);
1901         input_report_key(input, keycode, 1);
1902         input_sync(input);
1903         input_report_key(input, keycode, 0);
1904         input_sync(input);
1905
1906         return;
1907 }
1908
1909 static int instance;
1910 static int acpi_video_resume(struct acpi_device *device)
1911 {
1912         struct acpi_video_bus *video;
1913         struct acpi_video_device *video_device;
1914         int i;
1915
1916         if (!device || !acpi_driver_data(device))
1917                 return -EINVAL;
1918
1919         video = acpi_driver_data(device);
1920
1921         for (i = 0; i < video->attached_count; i++) {
1922                 video_device = video->attached_array[i].bind_info;
1923                 if (video_device && video_device->backlight)
1924                         acpi_video_set_brightness(video_device->backlight);
1925         }
1926         return AE_OK;
1927 }
1928
1929 static int acpi_video_bus_add(struct acpi_device *device)
1930 {
1931         acpi_status status;
1932         struct acpi_video_bus *video;
1933         struct input_dev *input;
1934         int error;
1935
1936         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1937         if (!video)
1938                 return -ENOMEM;
1939
1940         /* a hack to fix the duplicate name "VID" problem on T61 */
1941         if (!strcmp(device->pnp.bus_id, "VID")) {
1942                 if (instance)
1943                         device->pnp.bus_id[3] = '0' + instance;
1944                 instance ++;
1945         }
1946
1947         video->device = device;
1948         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1949         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1950         acpi_driver_data(device) = video;
1951
1952         acpi_video_bus_find_cap(video);
1953         error = acpi_video_bus_check(video);
1954         if (error)
1955                 goto err_free_video;
1956
1957         error = acpi_video_bus_add_fs(device);
1958         if (error)
1959                 goto err_free_video;
1960
1961         mutex_init(&video->device_list_lock);
1962         INIT_LIST_HEAD(&video->video_device_list);
1963
1964         acpi_video_bus_get_devices(video, device);
1965         acpi_video_bus_start_devices(video);
1966
1967         status = acpi_install_notify_handler(device->handle,
1968                                              ACPI_DEVICE_NOTIFY,
1969                                              acpi_video_bus_notify, video);
1970         if (ACPI_FAILURE(status)) {
1971                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1972                                   "Error installing notify handler\n"));
1973                 error = -ENODEV;
1974                 goto err_stop_video;
1975         }
1976
1977         video->input = input = input_allocate_device();
1978         if (!input) {
1979                 error = -ENOMEM;
1980                 goto err_uninstall_notify;
1981         }
1982
1983         snprintf(video->phys, sizeof(video->phys),
1984                 "%s/video/input0", acpi_device_hid(video->device));
1985
1986         input->name = acpi_device_name(video->device);
1987         input->phys = video->phys;
1988         input->id.bustype = BUS_HOST;
1989         input->id.product = 0x06;
1990         input->dev.parent = &device->dev;
1991         input->evbit[0] = BIT(EV_KEY);
1992         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1993         set_bit(KEY_VIDEO_NEXT, input->keybit);
1994         set_bit(KEY_VIDEO_PREV, input->keybit);
1995         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1996         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1997         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1998         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1999         set_bit(KEY_DISPLAY_OFF, input->keybit);
2000         set_bit(KEY_UNKNOWN, input->keybit);
2001
2002         error = input_register_device(input);
2003         if (error)
2004                 goto err_free_input_dev;
2005
2006         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2007                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2008                video->flags.multihead ? "yes" : "no",
2009                video->flags.rom ? "yes" : "no",
2010                video->flags.post ? "yes" : "no");
2011
2012         return 0;
2013
2014  err_free_input_dev:
2015         input_free_device(input);
2016  err_uninstall_notify:
2017         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2018                                    acpi_video_bus_notify);
2019  err_stop_video:
2020         acpi_video_bus_stop_devices(video);
2021         acpi_video_bus_put_devices(video);
2022         kfree(video->attached_array);
2023         acpi_video_bus_remove_fs(device);
2024  err_free_video:
2025         kfree(video);
2026         acpi_driver_data(device) = NULL;
2027
2028         return error;
2029 }
2030
2031 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2032 {
2033         acpi_status status = 0;
2034         struct acpi_video_bus *video = NULL;
2035
2036
2037         if (!device || !acpi_driver_data(device))
2038                 return -EINVAL;
2039
2040         video = acpi_driver_data(device);
2041
2042         acpi_video_bus_stop_devices(video);
2043
2044         status = acpi_remove_notify_handler(video->device->handle,
2045                                             ACPI_DEVICE_NOTIFY,
2046                                             acpi_video_bus_notify);
2047
2048         acpi_video_bus_put_devices(video);
2049         acpi_video_bus_remove_fs(device);
2050
2051         input_unregister_device(video->input);
2052         kfree(video->attached_array);
2053         kfree(video);
2054
2055         return 0;
2056 }
2057
2058 static int __init acpi_video_init(void)
2059 {
2060         int result = 0;
2061
2062
2063         /*
2064            acpi_dbg_level = 0xFFFFFFFF;
2065            acpi_dbg_layer = 0x08000000;
2066          */
2067
2068         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2069         if (!acpi_video_dir)
2070                 return -ENODEV;
2071         acpi_video_dir->owner = THIS_MODULE;
2072
2073         result = acpi_bus_register_driver(&acpi_video_bus);
2074         if (result < 0) {
2075                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2076                 return -ENODEV;
2077         }
2078
2079         return 0;
2080 }
2081
2082 static void __exit acpi_video_exit(void)
2083 {
2084
2085         acpi_bus_unregister_driver(&acpi_video_bus);
2086
2087         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2088
2089         return;
2090 }
2091
2092 module_init(acpi_video_init);
2093 module_exit(acpi_video_exit);