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Merge branch 'pnp' into release
[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         .open = acpi_video_bus_info_open_fs,
194         .read = seq_read,
195         .llseek = seq_lseek,
196         .release = single_release,
197 };
198
199 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
200 static struct file_operations acpi_video_bus_ROM_fops = {
201         .open = acpi_video_bus_ROM_open_fs,
202         .read = seq_read,
203         .llseek = seq_lseek,
204         .release = single_release,
205 };
206
207 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
208                                             struct file *file);
209 static struct file_operations acpi_video_bus_POST_info_fops = {
210         .open = acpi_video_bus_POST_info_open_fs,
211         .read = seq_read,
212         .llseek = seq_lseek,
213         .release = single_release,
214 };
215
216 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
217 static struct file_operations acpi_video_bus_POST_fops = {
218         .open = acpi_video_bus_POST_open_fs,
219         .read = seq_read,
220         .llseek = seq_lseek,
221         .release = single_release,
222 };
223
224 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
225 static struct file_operations acpi_video_bus_DOS_fops = {
226         .open = acpi_video_bus_DOS_open_fs,
227         .read = seq_read,
228         .llseek = seq_lseek,
229         .release = single_release,
230 };
231
232 /* device */
233 static int acpi_video_device_info_open_fs(struct inode *inode,
234                                           struct file *file);
235 static struct file_operations acpi_video_device_info_fops = {
236         .open = acpi_video_device_info_open_fs,
237         .read = seq_read,
238         .llseek = seq_lseek,
239         .release = single_release,
240 };
241
242 static int acpi_video_device_state_open_fs(struct inode *inode,
243                                            struct file *file);
244 static struct file_operations acpi_video_device_state_fops = {
245         .open = acpi_video_device_state_open_fs,
246         .read = seq_read,
247         .llseek = seq_lseek,
248         .release = single_release,
249 };
250
251 static int acpi_video_device_brightness_open_fs(struct inode *inode,
252                                                 struct file *file);
253 static struct file_operations acpi_video_device_brightness_fops = {
254         .open = acpi_video_device_brightness_open_fs,
255         .read = seq_read,
256         .llseek = seq_lseek,
257         .release = single_release,
258 };
259
260 static int acpi_video_device_EDID_open_fs(struct inode *inode,
261                                           struct file *file);
262 static struct file_operations acpi_video_device_EDID_fops = {
263         .open = acpi_video_device_EDID_open_fs,
264         .read = seq_read,
265         .llseek = seq_lseek,
266         .release = single_release,
267 };
268
269 static char device_decode[][30] = {
270         "motherboard VGA device",
271         "PCI VGA device",
272         "AGP VGA device",
273         "UNKNOWN",
274 };
275
276 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
277 static void acpi_video_device_rebind(struct acpi_video_bus *video);
278 static void acpi_video_device_bind(struct acpi_video_bus *video,
279                                    struct acpi_video_device *device);
280 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
281 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
282                         int level);
283 static int acpi_video_device_lcd_get_level_current(
284                         struct acpi_video_device *device,
285                         unsigned long *level);
286 static int acpi_video_get_next_level(struct acpi_video_device *device,
287                                      u32 level_current, u32 event);
288 static void acpi_video_switch_brightness(struct acpi_video_device *device,
289                                          int event);
290 static int acpi_video_device_get_state(struct acpi_video_device *device,
291                             unsigned long *state);
292 static int acpi_video_output_get(struct output_device *od);
293 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
294
295 /*backlight device sysfs support*/
296 static int acpi_video_get_brightness(struct backlight_device *bd)
297 {
298         unsigned long cur_level;
299         int i;
300         struct acpi_video_device *vd =
301                 (struct acpi_video_device *)bl_get_data(bd);
302         acpi_video_device_lcd_get_level_current(vd, &cur_level);
303         for (i = 2; i < vd->brightness->count; i++) {
304                 if (vd->brightness->levels[i] == cur_level)
305                         /* The first two entries are special - see page 575
306                            of the ACPI spec 3.0 */
307                         return i-2;
308         }
309         return 0;
310 }
311
312 static int acpi_video_set_brightness(struct backlight_device *bd)
313 {
314         int request_level = bd->props.brightness+2;
315         struct acpi_video_device *vd =
316                 (struct acpi_video_device *)bl_get_data(bd);
317         acpi_video_device_lcd_set_level(vd,
318                                         vd->brightness->levels[request_level]);
319         return 0;
320 }
321
322 static struct backlight_ops acpi_backlight_ops = {
323         .get_brightness = acpi_video_get_brightness,
324         .update_status  = acpi_video_set_brightness,
325 };
326
327 /*video output device sysfs support*/
328 static int acpi_video_output_get(struct output_device *od)
329 {
330         unsigned long state;
331         struct acpi_video_device *vd =
332                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
333         acpi_video_device_get_state(vd, &state);
334         return (int)state;
335 }
336
337 static int acpi_video_output_set(struct output_device *od)
338 {
339         unsigned long state = od->request_state;
340         struct acpi_video_device *vd=
341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
342         return acpi_video_device_set_state(vd, state);
343 }
344
345 static struct output_properties acpi_output_properties = {
346         .set_state = acpi_video_output_set,
347         .get_status = acpi_video_output_get,
348 };
349
350
351 /* thermal cooling device callbacks */
352 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
353 {
354         struct acpi_device *device = cdev->devdata;
355         struct acpi_video_device *video = acpi_driver_data(device);
356
357         return sprintf(buf, "%d\n", video->brightness->count - 3);
358 }
359
360 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
361 {
362         struct acpi_device *device = cdev->devdata;
363         struct acpi_video_device *video = acpi_driver_data(device);
364         unsigned long level;
365         int state;
366
367         acpi_video_device_lcd_get_level_current(video, &level);
368         for (state = 2; state < video->brightness->count; state++)
369                 if (level == video->brightness->levels[state])
370                         return sprintf(buf, "%d\n",
371                                        video->brightness->count - state - 1);
372
373         return -EINVAL;
374 }
375
376 static int
377 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
378 {
379         struct acpi_device *device = cdev->devdata;
380         struct acpi_video_device *video = acpi_driver_data(device);
381         int level;
382
383         if ( state >= video->brightness->count - 2)
384                 return -EINVAL;
385
386         state = video->brightness->count - state;
387         level = video->brightness->levels[state -1];
388         return acpi_video_device_lcd_set_level(video, level);
389 }
390
391 static struct thermal_cooling_device_ops video_cooling_ops = {
392         .get_max_state = video_get_max_state,
393         .get_cur_state = video_get_cur_state,
394         .set_cur_state = video_set_cur_state,
395 };
396
397 /* --------------------------------------------------------------------------
398                                Video Management
399    -------------------------------------------------------------------------- */
400
401 /* device */
402
403 static int
404 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
405 {
406         int status;
407
408         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
409
410         return status;
411 }
412
413 static int
414 acpi_video_device_get_state(struct acpi_video_device *device,
415                             unsigned long *state)
416 {
417         int status;
418
419         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
420
421         return status;
422 }
423
424 static int
425 acpi_video_device_set_state(struct acpi_video_device *device, int state)
426 {
427         int status;
428         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
429         struct acpi_object_list args = { 1, &arg0 };
430         unsigned long ret;
431
432
433         arg0.integer.value = state;
434         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
435
436         return status;
437 }
438
439 static int
440 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
441                                    union acpi_object **levels)
442 {
443         int status;
444         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
445         union acpi_object *obj;
446
447
448         *levels = NULL;
449
450         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
451         if (!ACPI_SUCCESS(status))
452                 return status;
453         obj = (union acpi_object *)buffer.pointer;
454         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
455                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
456                 status = -EFAULT;
457                 goto err;
458         }
459
460         *levels = obj;
461
462         return 0;
463
464       err:
465         kfree(buffer.pointer);
466
467         return status;
468 }
469
470 static int
471 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
472 {
473         int status = AE_OK;
474         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
475         struct acpi_object_list args = { 1, &arg0 };
476
477
478         arg0.integer.value = level;
479
480         if (device->cap._BCM)
481                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
482                                               &args, NULL);
483         device->brightness->curr = level;
484         return status;
485 }
486
487 static int
488 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
489                                         unsigned long *level)
490 {
491         if (device->cap._BQC)
492                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
493                                              level);
494         *level = device->brightness->curr;
495         return AE_OK;
496 }
497
498 static int
499 acpi_video_device_EDID(struct acpi_video_device *device,
500                        union acpi_object **edid, ssize_t length)
501 {
502         int status;
503         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
504         union acpi_object *obj;
505         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
506         struct acpi_object_list args = { 1, &arg0 };
507
508
509         *edid = NULL;
510
511         if (!device)
512                 return -ENODEV;
513         if (length == 128)
514                 arg0.integer.value = 1;
515         else if (length == 256)
516                 arg0.integer.value = 2;
517         else
518                 return -EINVAL;
519
520         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
521         if (ACPI_FAILURE(status))
522                 return -ENODEV;
523
524         obj = buffer.pointer;
525
526         if (obj && obj->type == ACPI_TYPE_BUFFER)
527                 *edid = obj;
528         else {
529                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
530                 status = -EFAULT;
531                 kfree(obj);
532         }
533
534         return status;
535 }
536
537 /* bus */
538
539 static int
540 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
541 {
542         int status;
543         unsigned long tmp;
544         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
545         struct acpi_object_list args = { 1, &arg0 };
546
547
548         arg0.integer.value = option;
549
550         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
551         if (ACPI_SUCCESS(status))
552                 status = tmp ? (-EINVAL) : (AE_OK);
553
554         return status;
555 }
556
557 static int
558 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
559 {
560         int status;
561
562         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
563
564         return status;
565 }
566
567 static int
568 acpi_video_bus_POST_options(struct acpi_video_bus *video,
569                             unsigned long *options)
570 {
571         int status;
572
573         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
574         *options &= 3;
575
576         return status;
577 }
578
579 /*
580  *  Arg:
581  *      video           : video bus device pointer
582  *      bios_flag       : 
583  *              0.      The system BIOS should NOT automatically switch(toggle)
584  *                      the active display output.
585  *              1.      The system BIOS should automatically switch (toggle) the
586  *                      active display output. No switch event.
587  *              2.      The _DGS value should be locked.
588  *              3.      The system BIOS should not automatically switch (toggle) the
589  *                      active display output, but instead generate the display switch
590  *                      event notify code.
591  *      lcd_flag        :
592  *              0.      The system BIOS should automatically control the brightness level
593  *                      of the LCD when the power changes from AC to DC
594  *              1.      The system BIOS should NOT automatically control the brightness 
595  *                      level of the LCD when the power changes from AC to DC.
596  * Return Value:
597  *              -1      wrong arg.
598  */
599
600 static int
601 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
602 {
603         acpi_integer status = 0;
604         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
605         struct acpi_object_list args = { 1, &arg0 };
606
607
608         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
609                 status = -1;
610                 goto Failed;
611         }
612         arg0.integer.value = (lcd_flag << 2) | bios_flag;
613         video->dos_setting = arg0.integer.value;
614         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
615
616       Failed:
617         return status;
618 }
619
620 /*
621  *  Arg:        
622  *      device  : video output device (LCD, CRT, ..)
623  *
624  *  Return Value:
625  *      None
626  *
627  *  Find out all required AML methods defined under the output
628  *  device.
629  */
630
631 static void acpi_video_device_find_cap(struct acpi_video_device *device)
632 {
633         acpi_handle h_dummy1;
634         int i;
635         u32 max_level = 0;
636         union acpi_object *obj = NULL;
637         struct acpi_video_device_brightness *br = NULL;
638
639
640         memset(&device->cap, 0, sizeof(device->cap));
641
642         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
643                 device->cap._ADR = 1;
644         }
645         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
646                 device->cap._BCL = 1;
647         }
648         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
649                 device->cap._BCM = 1;
650         }
651         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
652                 device->cap._BQC = 1;
653         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
654                 device->cap._DDC = 1;
655         }
656         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
657                 device->cap._DCS = 1;
658         }
659         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
660                 device->cap._DGS = 1;
661         }
662         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
663                 device->cap._DSS = 1;
664         }
665
666         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
667
668                 if (obj->package.count >= 2) {
669                         int count = 0;
670                         union acpi_object *o;
671
672                         br = kzalloc(sizeof(*br), GFP_KERNEL);
673                         if (!br) {
674                                 printk(KERN_ERR "can't allocate memory\n");
675                         } else {
676                                 br->levels = kmalloc(obj->package.count *
677                                                      sizeof *(br->levels), GFP_KERNEL);
678                                 if (!br->levels)
679                                         goto out;
680
681                                 for (i = 0; i < obj->package.count; i++) {
682                                         o = (union acpi_object *)&obj->package.
683                                             elements[i];
684                                         if (o->type != ACPI_TYPE_INTEGER) {
685                                                 printk(KERN_ERR PREFIX "Invalid data\n");
686                                                 continue;
687                                         }
688                                         br->levels[count] = (u32) o->integer.value;
689
690                                         if (br->levels[count] > max_level)
691                                                 max_level = br->levels[count];
692                                         count++;
693                                 }
694                               out:
695                                 if (count < 2) {
696                                         kfree(br->levels);
697                                         kfree(br);
698                                 } else {
699                                         br->count = count;
700                                         device->brightness = br;
701                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
702                                                           "found %d brightness levels\n",
703                                                           count));
704                                 }
705                         }
706                 }
707
708         } else {
709                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
710         }
711
712         kfree(obj);
713
714         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
715                 int result;
716                 static int count = 0;
717                 char *name;
718                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
719                 if (!name)
720                         return;
721
722                 sprintf(name, "acpi_video%d", count++);
723                 device->backlight = backlight_device_register(name,
724                         NULL, device, &acpi_backlight_ops);
725                 device->backlight->props.max_brightness = device->brightness->count-3;
726                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
727                 backlight_update_status(device->backlight);
728                 kfree(name);
729
730                 device->cdev = thermal_cooling_device_register("LCD",
731                                         device->dev, &video_cooling_ops);
732                 if (IS_ERR(device->cdev))
733                         return;
734
735                 printk(KERN_INFO PREFIX
736                         "%s is registered as cooling_device%d\n",
737                         device->dev->dev.bus_id, device->cdev->id);
738                 result = sysfs_create_link(&device->dev->dev.kobj,
739                                 &device->cdev->device.kobj,
740                                 "thermal_cooling");
741                 if (result)
742                         printk(KERN_ERR PREFIX "Create sysfs link\n");
743                 result = sysfs_create_link(&device->cdev->device.kobj,
744                                 &device->dev->dev.kobj, "device");
745                 if (result)
746                         printk(KERN_ERR PREFIX "Create sysfs link\n");
747
748         }
749         if (device->cap._DCS && device->cap._DSS){
750                 static int count = 0;
751                 char *name;
752                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
753                 if (!name)
754                         return;
755                 sprintf(name, "acpi_video%d", count++);
756                 device->output_dev = video_output_register(name,
757                                 NULL, device, &acpi_output_properties);
758                 kfree(name);
759         }
760         return;
761 }
762
763 /*
764  *  Arg:        
765  *      device  : video output device (VGA)
766  *
767  *  Return Value:
768  *      None
769  *
770  *  Find out all required AML methods defined under the video bus device.
771  */
772
773 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
774 {
775         acpi_handle h_dummy1;
776
777         memset(&video->cap, 0, sizeof(video->cap));
778         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
779                 video->cap._DOS = 1;
780         }
781         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
782                 video->cap._DOD = 1;
783         }
784         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
785                 video->cap._ROM = 1;
786         }
787         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
788                 video->cap._GPD = 1;
789         }
790         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
791                 video->cap._SPD = 1;
792         }
793         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
794                 video->cap._VPO = 1;
795         }
796 }
797
798 /*
799  * Check whether the video bus device has required AML method to
800  * support the desired features
801  */
802
803 static int acpi_video_bus_check(struct acpi_video_bus *video)
804 {
805         acpi_status status = -ENOENT;
806
807
808         if (!video)
809                 return -EINVAL;
810
811         /* Since there is no HID, CID and so on for VGA driver, we have
812          * to check well known required nodes.
813          */
814
815         /* Does this device support video switching? */
816         if (video->cap._DOS) {
817                 video->flags.multihead = 1;
818                 status = 0;
819         }
820
821         /* Does this device support retrieving a video ROM? */
822         if (video->cap._ROM) {
823                 video->flags.rom = 1;
824                 status = 0;
825         }
826
827         /* Does this device support configuring which video device to POST? */
828         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
829                 video->flags.post = 1;
830                 status = 0;
831         }
832
833         return status;
834 }
835
836 /* --------------------------------------------------------------------------
837                               FS Interface (/proc)
838    -------------------------------------------------------------------------- */
839
840 static struct proc_dir_entry *acpi_video_dir;
841
842 /* video devices */
843
844 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
845 {
846         struct acpi_video_device *dev = seq->private;
847
848
849         if (!dev)
850                 goto end;
851
852         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
853         seq_printf(seq, "type:         ");
854         if (dev->flags.crt)
855                 seq_printf(seq, "CRT\n");
856         else if (dev->flags.lcd)
857                 seq_printf(seq, "LCD\n");
858         else if (dev->flags.tvout)
859                 seq_printf(seq, "TVOUT\n");
860         else if (dev->flags.dvi)
861                 seq_printf(seq, "DVI\n");
862         else
863                 seq_printf(seq, "UNKNOWN\n");
864
865         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
866
867       end:
868         return 0;
869 }
870
871 static int
872 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
873 {
874         return single_open(file, acpi_video_device_info_seq_show,
875                            PDE(inode)->data);
876 }
877
878 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
879 {
880         int status;
881         struct acpi_video_device *dev = seq->private;
882         unsigned long state;
883
884
885         if (!dev)
886                 goto end;
887
888         status = acpi_video_device_get_state(dev, &state);
889         seq_printf(seq, "state:     ");
890         if (ACPI_SUCCESS(status))
891                 seq_printf(seq, "0x%02lx\n", state);
892         else
893                 seq_printf(seq, "<not supported>\n");
894
895         status = acpi_video_device_query(dev, &state);
896         seq_printf(seq, "query:     ");
897         if (ACPI_SUCCESS(status))
898                 seq_printf(seq, "0x%02lx\n", state);
899         else
900                 seq_printf(seq, "<not supported>\n");
901
902       end:
903         return 0;
904 }
905
906 static int
907 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
908 {
909         return single_open(file, acpi_video_device_state_seq_show,
910                            PDE(inode)->data);
911 }
912
913 static ssize_t
914 acpi_video_device_write_state(struct file *file,
915                               const char __user * buffer,
916                               size_t count, loff_t * data)
917 {
918         int status;
919         struct seq_file *m = file->private_data;
920         struct acpi_video_device *dev = m->private;
921         char str[12] = { 0 };
922         u32 state = 0;
923
924
925         if (!dev || count + 1 > sizeof str)
926                 return -EINVAL;
927
928         if (copy_from_user(str, buffer, count))
929                 return -EFAULT;
930
931         str[count] = 0;
932         state = simple_strtoul(str, NULL, 0);
933         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
934
935         status = acpi_video_device_set_state(dev, state);
936
937         if (status)
938                 return -EFAULT;
939
940         return count;
941 }
942
943 static int
944 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
945 {
946         struct acpi_video_device *dev = seq->private;
947         int i;
948
949
950         if (!dev || !dev->brightness) {
951                 seq_printf(seq, "<not supported>\n");
952                 return 0;
953         }
954
955         seq_printf(seq, "levels: ");
956         for (i = 0; i < dev->brightness->count; i++)
957                 seq_printf(seq, " %d", dev->brightness->levels[i]);
958         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
959
960         return 0;
961 }
962
963 static int
964 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
965 {
966         return single_open(file, acpi_video_device_brightness_seq_show,
967                            PDE(inode)->data);
968 }
969
970 static ssize_t
971 acpi_video_device_write_brightness(struct file *file,
972                                    const char __user * buffer,
973                                    size_t count, loff_t * data)
974 {
975         struct seq_file *m = file->private_data;
976         struct acpi_video_device *dev = m->private;
977         char str[5] = { 0 };
978         unsigned int level = 0;
979         int i;
980
981
982         if (!dev || !dev->brightness || count + 1 > sizeof str)
983                 return -EINVAL;
984
985         if (copy_from_user(str, buffer, count))
986                 return -EFAULT;
987
988         str[count] = 0;
989         level = simple_strtoul(str, NULL, 0);
990
991         if (level > 100)
992                 return -EFAULT;
993
994         /* validate through the list of available levels */
995         for (i = 0; i < dev->brightness->count; i++)
996                 if (level == dev->brightness->levels[i]) {
997                         if (ACPI_SUCCESS
998                             (acpi_video_device_lcd_set_level(dev, level)))
999                                 dev->brightness->curr = level;
1000                         break;
1001                 }
1002
1003         return count;
1004 }
1005
1006 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1007 {
1008         struct acpi_video_device *dev = seq->private;
1009         int status;
1010         int i;
1011         union acpi_object *edid = NULL;
1012
1013
1014         if (!dev)
1015                 goto out;
1016
1017         status = acpi_video_device_EDID(dev, &edid, 128);
1018         if (ACPI_FAILURE(status)) {
1019                 status = acpi_video_device_EDID(dev, &edid, 256);
1020         }
1021
1022         if (ACPI_FAILURE(status)) {
1023                 goto out;
1024         }
1025
1026         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1027                 for (i = 0; i < edid->buffer.length; i++)
1028                         seq_putc(seq, edid->buffer.pointer[i]);
1029         }
1030
1031       out:
1032         if (!edid)
1033                 seq_printf(seq, "<not supported>\n");
1034         else
1035                 kfree(edid);
1036
1037         return 0;
1038 }
1039
1040 static int
1041 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1042 {
1043         return single_open(file, acpi_video_device_EDID_seq_show,
1044                            PDE(inode)->data);
1045 }
1046
1047 static int acpi_video_device_add_fs(struct acpi_device *device)
1048 {
1049         struct proc_dir_entry *entry, *device_dir;
1050         struct acpi_video_device *vid_dev;
1051
1052         vid_dev = acpi_driver_data(device);
1053         if (!vid_dev)
1054                 return -ENODEV;
1055
1056         device_dir = proc_mkdir(acpi_device_bid(device),
1057                                 vid_dev->video->dir);
1058         if (!device_dir)
1059                 return -ENOMEM;
1060
1061         device_dir->owner = THIS_MODULE;
1062
1063         /* 'info' [R] */
1064         entry = create_proc_entry("info", S_IRUGO, device_dir);
1065         if (!entry)
1066                 goto err_remove_dir;
1067
1068         entry->proc_fops = &acpi_video_device_info_fops;
1069         entry->data = acpi_driver_data(device);
1070         entry->owner = THIS_MODULE;
1071
1072         /* 'state' [R/W] */
1073         entry = create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1074                                   device_dir);
1075         if (!entry)
1076                 goto err_remove_info;
1077
1078         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1079         entry->proc_fops = &acpi_video_device_state_fops;
1080         entry->data = acpi_driver_data(device);
1081         entry->owner = THIS_MODULE;
1082
1083         /* 'brightness' [R/W] */
1084         entry = create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1085                                   device_dir);
1086         if (!entry)
1087                 goto err_remove_state;
1088
1089         acpi_video_device_brightness_fops.write =
1090                         acpi_video_device_write_brightness;
1091         entry->proc_fops = &acpi_video_device_brightness_fops;
1092         entry->data = acpi_driver_data(device);
1093         entry->owner = THIS_MODULE;
1094
1095         /* 'EDID' [R] */
1096         entry = create_proc_entry("EDID", S_IRUGO, device_dir);
1097         if (!entry)
1098                 goto err_remove_brightness;
1099
1100         entry->proc_fops = &acpi_video_device_EDID_fops;
1101         entry->data = acpi_driver_data(device);
1102         entry->owner = THIS_MODULE;
1103
1104         acpi_device_dir(device) = device_dir;
1105         return 0;
1106
1107  err_remove_brightness:
1108         remove_proc_entry("brightness", device_dir);
1109  err_remove_state:
1110         remove_proc_entry("state", device_dir);
1111  err_remove_info:
1112         remove_proc_entry("info", device_dir);
1113  err_remove_dir:
1114         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1115         return -ENOMEM;
1116 }
1117
1118 static int acpi_video_device_remove_fs(struct acpi_device *device)
1119 {
1120         struct acpi_video_device *vid_dev;
1121         struct proc_dir_entry *device_dir;
1122
1123         vid_dev = acpi_driver_data(device);
1124         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1125                 return -ENODEV;
1126
1127         device_dir = acpi_device_dir(device);
1128         if (device_dir) {
1129                 remove_proc_entry("info", device_dir);
1130                 remove_proc_entry("state", device_dir);
1131                 remove_proc_entry("brightness", device_dir);
1132                 remove_proc_entry("EDID", device_dir);
1133                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1134                 acpi_device_dir(device) = NULL;
1135         }
1136
1137         return 0;
1138 }
1139
1140 /* video bus */
1141 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1142 {
1143         struct acpi_video_bus *video = seq->private;
1144
1145
1146         if (!video)
1147                 goto end;
1148
1149         seq_printf(seq, "Switching heads:              %s\n",
1150                    video->flags.multihead ? "yes" : "no");
1151         seq_printf(seq, "Video ROM:                    %s\n",
1152                    video->flags.rom ? "yes" : "no");
1153         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1154                    video->flags.post ? "yes" : "no");
1155
1156       end:
1157         return 0;
1158 }
1159
1160 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1161 {
1162         return single_open(file, acpi_video_bus_info_seq_show,
1163                            PDE(inode)->data);
1164 }
1165
1166 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1167 {
1168         struct acpi_video_bus *video = seq->private;
1169
1170
1171         if (!video)
1172                 goto end;
1173
1174         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1175         seq_printf(seq, "<TODO>\n");
1176
1177       end:
1178         return 0;
1179 }
1180
1181 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1182 {
1183         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1184 }
1185
1186 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1187 {
1188         struct acpi_video_bus *video = seq->private;
1189         unsigned long options;
1190         int status;
1191
1192
1193         if (!video)
1194                 goto end;
1195
1196         status = acpi_video_bus_POST_options(video, &options);
1197         if (ACPI_SUCCESS(status)) {
1198                 if (!(options & 1)) {
1199                         printk(KERN_WARNING PREFIX
1200                                "The motherboard VGA device is not listed as a possible POST device.\n");
1201                         printk(KERN_WARNING PREFIX
1202                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1203                 }
1204                 printk("%lx\n", options);
1205                 seq_printf(seq, "can POST: <integrated video>");
1206                 if (options & 2)
1207                         seq_printf(seq, " <PCI video>");
1208                 if (options & 4)
1209                         seq_printf(seq, " <AGP video>");
1210                 seq_putc(seq, '\n');
1211         } else
1212                 seq_printf(seq, "<not supported>\n");
1213       end:
1214         return 0;
1215 }
1216
1217 static int
1218 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1219 {
1220         return single_open(file, acpi_video_bus_POST_info_seq_show,
1221                            PDE(inode)->data);
1222 }
1223
1224 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1225 {
1226         struct acpi_video_bus *video = seq->private;
1227         int status;
1228         unsigned long id;
1229
1230
1231         if (!video)
1232                 goto end;
1233
1234         status = acpi_video_bus_get_POST(video, &id);
1235         if (!ACPI_SUCCESS(status)) {
1236                 seq_printf(seq, "<not supported>\n");
1237                 goto end;
1238         }
1239         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1240
1241       end:
1242         return 0;
1243 }
1244
1245 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1246 {
1247         struct acpi_video_bus *video = seq->private;
1248
1249
1250         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1251
1252         return 0;
1253 }
1254
1255 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1256 {
1257         return single_open(file, acpi_video_bus_POST_seq_show,
1258                            PDE(inode)->data);
1259 }
1260
1261 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1262 {
1263         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1264 }
1265
1266 static ssize_t
1267 acpi_video_bus_write_POST(struct file *file,
1268                           const char __user * buffer,
1269                           size_t count, loff_t * data)
1270 {
1271         int status;
1272         struct seq_file *m = file->private_data;
1273         struct acpi_video_bus *video = m->private;
1274         char str[12] = { 0 };
1275         unsigned long opt, options;
1276
1277
1278         if (!video || count + 1 > sizeof str)
1279                 return -EINVAL;
1280
1281         status = acpi_video_bus_POST_options(video, &options);
1282         if (!ACPI_SUCCESS(status))
1283                 return -EINVAL;
1284
1285         if (copy_from_user(str, buffer, count))
1286                 return -EFAULT;
1287
1288         str[count] = 0;
1289         opt = strtoul(str, NULL, 0);
1290         if (opt > 3)
1291                 return -EFAULT;
1292
1293         /* just in case an OEM 'forgot' the motherboard... */
1294         options |= 1;
1295
1296         if (options & (1ul << opt)) {
1297                 status = acpi_video_bus_set_POST(video, opt);
1298                 if (!ACPI_SUCCESS(status))
1299                         return -EFAULT;
1300
1301         }
1302
1303         return count;
1304 }
1305
1306 static ssize_t
1307 acpi_video_bus_write_DOS(struct file *file,
1308                          const char __user * buffer,
1309                          size_t count, loff_t * data)
1310 {
1311         int status;
1312         struct seq_file *m = file->private_data;
1313         struct acpi_video_bus *video = m->private;
1314         char str[12] = { 0 };
1315         unsigned long opt;
1316
1317
1318         if (!video || count + 1 > sizeof str)
1319                 return -EINVAL;
1320
1321         if (copy_from_user(str, buffer, count))
1322                 return -EFAULT;
1323
1324         str[count] = 0;
1325         opt = strtoul(str, NULL, 0);
1326         if (opt > 7)
1327                 return -EFAULT;
1328
1329         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1330
1331         if (!ACPI_SUCCESS(status))
1332                 return -EFAULT;
1333
1334         return count;
1335 }
1336
1337 static int acpi_video_bus_add_fs(struct acpi_device *device)
1338 {
1339         struct acpi_video_bus *video = acpi_driver_data(device);
1340         struct proc_dir_entry *device_dir;
1341         struct proc_dir_entry *entry;
1342
1343         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1344         if (!device_dir)
1345                 return -ENOMEM;
1346
1347         device_dir->owner = THIS_MODULE;
1348
1349         /* 'info' [R] */
1350         entry = create_proc_entry("info", S_IRUGO, device_dir);
1351         if (!entry)
1352                 goto err_remove_dir;
1353
1354         entry->proc_fops = &acpi_video_bus_info_fops;
1355         entry->data = acpi_driver_data(device);
1356         entry->owner = THIS_MODULE;
1357
1358         /* 'ROM' [R] */
1359         entry = create_proc_entry("ROM", S_IRUGO, device_dir);
1360         if (!entry)
1361                 goto err_remove_info;
1362
1363         entry->proc_fops = &acpi_video_bus_ROM_fops;
1364         entry->data = acpi_driver_data(device);
1365         entry->owner = THIS_MODULE;
1366
1367         /* 'POST_info' [R] */
1368         entry = create_proc_entry("POST_info", S_IRUGO, device_dir);
1369         if (!entry)
1370                 goto err_remove_rom;
1371
1372         entry->proc_fops = &acpi_video_bus_POST_info_fops;
1373         entry->data = acpi_driver_data(device);
1374         entry->owner = THIS_MODULE;
1375
1376         /* 'POST' [R/W] */
1377         entry = create_proc_entry("POST", S_IFREG | S_IRUGO | S_IWUSR,
1378                                   device_dir);
1379         if (!entry)
1380                 goto err_remove_post_info;
1381
1382         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1383         entry->proc_fops = &acpi_video_bus_POST_fops;
1384         entry->data = acpi_driver_data(device);
1385         entry->owner = THIS_MODULE;
1386
1387         /* 'DOS' [R/W] */
1388         entry = create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1389                               device_dir);
1390         if (!entry)
1391                 goto err_remove_post;
1392
1393         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1394         entry->proc_fops = &acpi_video_bus_DOS_fops;
1395         entry->data = acpi_driver_data(device);
1396         entry->owner = THIS_MODULE;
1397
1398         video->dir = acpi_device_dir(device) = device_dir;
1399         return 0;
1400
1401  err_remove_post:
1402         remove_proc_entry("POST", device_dir);
1403  err_remove_post_info:
1404         remove_proc_entry("POST_info", device_dir);
1405  err_remove_rom:
1406         remove_proc_entry("ROM", device_dir);
1407  err_remove_info:
1408         remove_proc_entry("info", device_dir);
1409  err_remove_dir:
1410         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1411         return -ENOMEM;
1412 }
1413
1414 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1415 {
1416         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1417
1418         if (device_dir) {
1419                 remove_proc_entry("info", device_dir);
1420                 remove_proc_entry("ROM", device_dir);
1421                 remove_proc_entry("POST_info", device_dir);
1422                 remove_proc_entry("POST", device_dir);
1423                 remove_proc_entry("DOS", device_dir);
1424                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1425                 acpi_device_dir(device) = NULL;
1426         }
1427
1428         return 0;
1429 }
1430
1431 /* --------------------------------------------------------------------------
1432                                  Driver Interface
1433    -------------------------------------------------------------------------- */
1434
1435 /* device interface */
1436 static struct acpi_video_device_attrib*
1437 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1438 {
1439         struct acpi_video_enumerated_device *ids;
1440         int i;
1441
1442         for (i = 0; i < video->attached_count; i++) {
1443                 ids = &video->attached_array[i];
1444                 if ((ids->value.int_val & 0xffff) == device_id)
1445                         return &ids->value.attrib;
1446         }
1447
1448         return NULL;
1449 }
1450
1451 static int
1452 acpi_video_bus_get_one_device(struct acpi_device *device,
1453                               struct acpi_video_bus *video)
1454 {
1455         unsigned long device_id;
1456         int status;
1457         struct acpi_video_device *data;
1458         struct acpi_video_device_attrib* attribute;
1459
1460         if (!device || !video)
1461                 return -EINVAL;
1462
1463         status =
1464             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1465         if (ACPI_SUCCESS(status)) {
1466
1467                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1468                 if (!data)
1469                         return -ENOMEM;
1470
1471                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1472                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1473                 acpi_driver_data(device) = data;
1474
1475                 data->device_id = device_id;
1476                 data->video = video;
1477                 data->dev = device;
1478
1479                 attribute = acpi_video_get_device_attr(video, device_id);
1480
1481                 if((attribute != NULL) && attribute->device_id_scheme) {
1482                         switch (attribute->display_type) {
1483                         case ACPI_VIDEO_DISPLAY_CRT:
1484                                 data->flags.crt = 1;
1485                                 break;
1486                         case ACPI_VIDEO_DISPLAY_TV:
1487                                 data->flags.tvout = 1;
1488                                 break;
1489                         case ACPI_VIDEO_DISPLAY_DVI:
1490                                 data->flags.dvi = 1;
1491                                 break;
1492                         case ACPI_VIDEO_DISPLAY_LCD:
1493                                 data->flags.lcd = 1;
1494                                 break;
1495                         default:
1496                                 data->flags.unknown = 1;
1497                                 break;
1498                         }
1499                         if(attribute->bios_can_detect)
1500                                 data->flags.bios = 1;
1501                 } else
1502                         data->flags.unknown = 1;
1503
1504                 acpi_video_device_bind(video, data);
1505                 acpi_video_device_find_cap(data);
1506
1507                 status = acpi_install_notify_handler(device->handle,
1508                                                      ACPI_DEVICE_NOTIFY,
1509                                                      acpi_video_device_notify,
1510                                                      data);
1511                 if (ACPI_FAILURE(status)) {
1512                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1513                                           "Error installing notify handler\n"));
1514                         if(data->brightness)
1515                                 kfree(data->brightness->levels);
1516                         kfree(data->brightness);
1517                         kfree(data);
1518                         return -ENODEV;
1519                 }
1520
1521                 mutex_lock(&video->device_list_lock);
1522                 list_add_tail(&data->entry, &video->video_device_list);
1523                 mutex_unlock(&video->device_list_lock);
1524
1525                 acpi_video_device_add_fs(device);
1526
1527                 return 0;
1528         }
1529
1530         return -ENOENT;
1531 }
1532
1533 /*
1534  *  Arg:
1535  *      video   : video bus device 
1536  *
1537  *  Return:
1538  *      none
1539  *  
1540  *  Enumerate the video device list of the video bus, 
1541  *  bind the ids with the corresponding video devices
1542  *  under the video bus.
1543  */
1544
1545 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1546 {
1547         struct acpi_video_device *dev;
1548
1549         mutex_lock(&video->device_list_lock);
1550
1551         list_for_each_entry(dev, &video->video_device_list, entry)
1552                 acpi_video_device_bind(video, dev);
1553
1554         mutex_unlock(&video->device_list_lock);
1555 }
1556
1557 /*
1558  *  Arg:
1559  *      video   : video bus device 
1560  *      device  : video output device under the video 
1561  *              bus
1562  *
1563  *  Return:
1564  *      none
1565  *  
1566  *  Bind the ids with the corresponding video devices
1567  *  under the video bus.
1568  */
1569
1570 static void
1571 acpi_video_device_bind(struct acpi_video_bus *video,
1572                        struct acpi_video_device *device)
1573 {
1574         struct acpi_video_enumerated_device *ids;
1575         int i;
1576
1577         for (i = 0; i < video->attached_count; i++) {
1578                 ids = &video->attached_array[i];
1579                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1580                         ids->bind_info = device;
1581                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1582                 }
1583         }
1584 }
1585
1586 /*
1587  *  Arg:
1588  *      video   : video bus device 
1589  *
1590  *  Return:
1591  *      < 0     : error
1592  *  
1593  *  Call _DOD to enumerate all devices attached to display adapter
1594  *
1595  */
1596
1597 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1598 {
1599         int status;
1600         int count;
1601         int i;
1602         struct acpi_video_enumerated_device *active_list;
1603         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1604         union acpi_object *dod = NULL;
1605         union acpi_object *obj;
1606
1607         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1608         if (!ACPI_SUCCESS(status)) {
1609                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1610                 return status;
1611         }
1612
1613         dod = buffer.pointer;
1614         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1615                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1616                 status = -EFAULT;
1617                 goto out;
1618         }
1619
1620         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1621                           dod->package.count));
1622
1623         active_list = kcalloc(1 + dod->package.count,
1624                               sizeof(struct acpi_video_enumerated_device),
1625                               GFP_KERNEL);
1626         if (!active_list) {
1627                 status = -ENOMEM;
1628                 goto out;
1629         }
1630
1631         count = 0;
1632         for (i = 0; i < dod->package.count; i++) {
1633                 obj = &dod->package.elements[i];
1634
1635                 if (obj->type != ACPI_TYPE_INTEGER) {
1636                         printk(KERN_ERR PREFIX
1637                                 "Invalid _DOD data in element %d\n", i);
1638                         continue;
1639                 }
1640
1641                 active_list[count].value.int_val = obj->integer.value;
1642                 active_list[count].bind_info = NULL;
1643                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1644                                   (int)obj->integer.value));
1645                 count++;
1646         }
1647
1648         kfree(video->attached_array);
1649
1650         video->attached_array = active_list;
1651         video->attached_count = count;
1652
1653  out:
1654         kfree(buffer.pointer);
1655         return status;
1656 }
1657
1658 static int
1659 acpi_video_get_next_level(struct acpi_video_device *device,
1660                           u32 level_current, u32 event)
1661 {
1662         int min, max, min_above, max_below, i, l, delta = 255;
1663         max = max_below = 0;
1664         min = min_above = 255;
1665         /* Find closest level to level_current */
1666         for (i = 0; i < device->brightness->count; i++) {
1667                 l = device->brightness->levels[i];
1668                 if (abs(l - level_current) < abs(delta)) {
1669                         delta = l - level_current;
1670                         if (!delta)
1671                                 break;
1672                 }
1673         }
1674         /* Ajust level_current to closest available level */
1675         level_current += delta;
1676         for (i = 0; i < device->brightness->count; i++) {
1677                 l = device->brightness->levels[i];
1678                 if (l < min)
1679                         min = l;
1680                 if (l > max)
1681                         max = l;
1682                 if (l < min_above && l > level_current)
1683                         min_above = l;
1684                 if (l > max_below && l < level_current)
1685                         max_below = l;
1686         }
1687
1688         switch (event) {
1689         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1690                 return (level_current < max) ? min_above : min;
1691         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1692                 return (level_current < max) ? min_above : max;
1693         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1694                 return (level_current > min) ? max_below : min;
1695         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1696         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1697                 return 0;
1698         default:
1699                 return level_current;
1700         }
1701 }
1702
1703 static void
1704 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1705 {
1706         unsigned long level_current, level_next;
1707         acpi_video_device_lcd_get_level_current(device, &level_current);
1708         level_next = acpi_video_get_next_level(device, level_current, event);
1709         acpi_video_device_lcd_set_level(device, level_next);
1710 }
1711
1712 static int
1713 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1714                            struct acpi_device *device)
1715 {
1716         int status = 0;
1717         struct acpi_device *dev;
1718
1719         acpi_video_device_enumerate(video);
1720
1721         list_for_each_entry(dev, &device->children, node) {
1722
1723                 status = acpi_video_bus_get_one_device(dev, video);
1724                 if (ACPI_FAILURE(status)) {
1725                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1726                         continue;
1727                 }
1728         }
1729         return status;
1730 }
1731
1732 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1733 {
1734         acpi_status status;
1735         struct acpi_video_bus *video;
1736
1737
1738         if (!device || !device->video)
1739                 return -ENOENT;
1740
1741         video = device->video;
1742
1743         acpi_video_device_remove_fs(device->dev);
1744
1745         status = acpi_remove_notify_handler(device->dev->handle,
1746                                             ACPI_DEVICE_NOTIFY,
1747                                             acpi_video_device_notify);
1748         backlight_device_unregister(device->backlight);
1749         if (device->cdev) {
1750                 sysfs_remove_link(&device->dev->dev.kobj,
1751                                   "thermal_cooling");
1752                 sysfs_remove_link(&device->cdev->device.kobj,
1753                                   "device");
1754                 thermal_cooling_device_unregister(device->cdev);
1755                 device->cdev = NULL;
1756         }
1757         video_output_unregister(device->output_dev);
1758
1759         return 0;
1760 }
1761
1762 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1763 {
1764         int status;
1765         struct acpi_video_device *dev, *next;
1766
1767         mutex_lock(&video->device_list_lock);
1768
1769         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1770
1771                 status = acpi_video_bus_put_one_device(dev);
1772                 if (ACPI_FAILURE(status))
1773                         printk(KERN_WARNING PREFIX
1774                                "hhuuhhuu bug in acpi video driver.\n");
1775
1776                 if (dev->brightness) {
1777                         kfree(dev->brightness->levels);
1778                         kfree(dev->brightness);
1779                 }
1780                 list_del(&dev->entry);
1781                 kfree(dev);
1782         }
1783
1784         mutex_unlock(&video->device_list_lock);
1785
1786         return 0;
1787 }
1788
1789 /* acpi_video interface */
1790
1791 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1792 {
1793         return acpi_video_bus_DOS(video, 0, 0);
1794 }
1795
1796 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1797 {
1798         return acpi_video_bus_DOS(video, 0, 1);
1799 }
1800
1801 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1802 {
1803         struct acpi_video_bus *video = data;
1804         struct acpi_device *device = NULL;
1805         struct input_dev *input;
1806         int keycode;
1807
1808         if (!video)
1809                 return;
1810
1811         device = video->device;
1812         input = video->input;
1813
1814         switch (event) {
1815         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1816                                          * most likely via hotkey. */
1817                 acpi_bus_generate_proc_event(device, event, 0);
1818                 keycode = KEY_SWITCHVIDEOMODE;
1819                 break;
1820
1821         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1822                                          * connector. */
1823                 acpi_video_device_enumerate(video);
1824                 acpi_video_device_rebind(video);
1825                 acpi_bus_generate_proc_event(device, event, 0);
1826                 keycode = KEY_SWITCHVIDEOMODE;
1827                 break;
1828
1829         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1830                 acpi_bus_generate_proc_event(device, event, 0);
1831                 keycode = KEY_SWITCHVIDEOMODE;
1832                 break;
1833         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1834                 acpi_bus_generate_proc_event(device, event, 0);
1835                 keycode = KEY_VIDEO_NEXT;
1836                 break;
1837         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1838                 acpi_bus_generate_proc_event(device, event, 0);
1839                 keycode = KEY_VIDEO_PREV;
1840                 break;
1841
1842         default:
1843                 keycode = KEY_UNKNOWN;
1844                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1845                                   "Unsupported event [0x%x]\n", event));
1846                 break;
1847         }
1848
1849         acpi_notifier_call_chain(device, event, 0);
1850         input_report_key(input, keycode, 1);
1851         input_sync(input);
1852         input_report_key(input, keycode, 0);
1853         input_sync(input);
1854
1855         return;
1856 }
1857
1858 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1859 {
1860         struct acpi_video_device *video_device = data;
1861         struct acpi_device *device = NULL;
1862         struct acpi_video_bus *bus;
1863         struct input_dev *input;
1864         int keycode;
1865
1866         if (!video_device)
1867                 return;
1868
1869         device = video_device->dev;
1870         bus = video_device->video;
1871         input = bus->input;
1872
1873         switch (event) {
1874         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1875                 if (brightness_switch_enabled)
1876                         acpi_video_switch_brightness(video_device, event);
1877                 acpi_bus_generate_proc_event(device, event, 0);
1878                 keycode = KEY_BRIGHTNESS_CYCLE;
1879                 break;
1880         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1881                 if (brightness_switch_enabled)
1882                         acpi_video_switch_brightness(video_device, event);
1883                 acpi_bus_generate_proc_event(device, event, 0);
1884                 keycode = KEY_BRIGHTNESSUP;
1885                 break;
1886         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1887                 if (brightness_switch_enabled)
1888                         acpi_video_switch_brightness(video_device, event);
1889                 acpi_bus_generate_proc_event(device, event, 0);
1890                 keycode = KEY_BRIGHTNESSDOWN;
1891                 break;
1892         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1893                 if (brightness_switch_enabled)
1894                         acpi_video_switch_brightness(video_device, event);
1895                 acpi_bus_generate_proc_event(device, event, 0);
1896                 keycode = KEY_BRIGHTNESS_ZERO;
1897                 break;
1898         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1899                 if (brightness_switch_enabled)
1900                         acpi_video_switch_brightness(video_device, event);
1901                 acpi_bus_generate_proc_event(device, event, 0);
1902                 keycode = KEY_DISPLAY_OFF;
1903                 break;
1904         default:
1905                 keycode = KEY_UNKNOWN;
1906                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1907                                   "Unsupported event [0x%x]\n", event));
1908                 break;
1909         }
1910
1911         acpi_notifier_call_chain(device, event, 0);
1912         input_report_key(input, keycode, 1);
1913         input_sync(input);
1914         input_report_key(input, keycode, 0);
1915         input_sync(input);
1916
1917         return;
1918 }
1919
1920 static int instance;
1921 static int acpi_video_resume(struct acpi_device *device)
1922 {
1923         struct acpi_video_bus *video;
1924         struct acpi_video_device *video_device;
1925         int i;
1926
1927         if (!device || !acpi_driver_data(device))
1928                 return -EINVAL;
1929
1930         video = acpi_driver_data(device);
1931
1932         for (i = 0; i < video->attached_count; i++) {
1933                 video_device = video->attached_array[i].bind_info;
1934                 if (video_device && video_device->backlight)
1935                         acpi_video_set_brightness(video_device->backlight);
1936         }
1937         return AE_OK;
1938 }
1939
1940 static int acpi_video_bus_add(struct acpi_device *device)
1941 {
1942         acpi_status status;
1943         struct acpi_video_bus *video;
1944         struct input_dev *input;
1945         int error;
1946
1947         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1948         if (!video)
1949                 return -ENOMEM;
1950
1951         /* a hack to fix the duplicate name "VID" problem on T61 */
1952         if (!strcmp(device->pnp.bus_id, "VID")) {
1953                 if (instance)
1954                         device->pnp.bus_id[3] = '0' + instance;
1955                 instance ++;
1956         }
1957
1958         video->device = device;
1959         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1960         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1961         acpi_driver_data(device) = video;
1962
1963         acpi_video_bus_find_cap(video);
1964         error = acpi_video_bus_check(video);
1965         if (error)
1966                 goto err_free_video;
1967
1968         error = acpi_video_bus_add_fs(device);
1969         if (error)
1970                 goto err_free_video;
1971
1972         mutex_init(&video->device_list_lock);
1973         INIT_LIST_HEAD(&video->video_device_list);
1974
1975         acpi_video_bus_get_devices(video, device);
1976         acpi_video_bus_start_devices(video);
1977
1978         status = acpi_install_notify_handler(device->handle,
1979                                              ACPI_DEVICE_NOTIFY,
1980                                              acpi_video_bus_notify, video);
1981         if (ACPI_FAILURE(status)) {
1982                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1983                                   "Error installing notify handler\n"));
1984                 error = -ENODEV;
1985                 goto err_stop_video;
1986         }
1987
1988         video->input = input = input_allocate_device();
1989         if (!input) {
1990                 error = -ENOMEM;
1991                 goto err_uninstall_notify;
1992         }
1993
1994         snprintf(video->phys, sizeof(video->phys),
1995                 "%s/video/input0", acpi_device_hid(video->device));
1996
1997         input->name = acpi_device_name(video->device);
1998         input->phys = video->phys;
1999         input->id.bustype = BUS_HOST;
2000         input->id.product = 0x06;
2001         input->dev.parent = &device->dev;
2002         input->evbit[0] = BIT(EV_KEY);
2003         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2004         set_bit(KEY_VIDEO_NEXT, input->keybit);
2005         set_bit(KEY_VIDEO_PREV, input->keybit);
2006         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2007         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2008         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2009         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2010         set_bit(KEY_DISPLAY_OFF, input->keybit);
2011         set_bit(KEY_UNKNOWN, input->keybit);
2012
2013         error = input_register_device(input);
2014         if (error)
2015                 goto err_free_input_dev;
2016
2017         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2018                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2019                video->flags.multihead ? "yes" : "no",
2020                video->flags.rom ? "yes" : "no",
2021                video->flags.post ? "yes" : "no");
2022
2023         return 0;
2024
2025  err_free_input_dev:
2026         input_free_device(input);
2027  err_uninstall_notify:
2028         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2029                                    acpi_video_bus_notify);
2030  err_stop_video:
2031         acpi_video_bus_stop_devices(video);
2032         acpi_video_bus_put_devices(video);
2033         kfree(video->attached_array);
2034         acpi_video_bus_remove_fs(device);
2035  err_free_video:
2036         kfree(video);
2037         acpi_driver_data(device) = NULL;
2038
2039         return error;
2040 }
2041
2042 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2043 {
2044         acpi_status status = 0;
2045         struct acpi_video_bus *video = NULL;
2046
2047
2048         if (!device || !acpi_driver_data(device))
2049                 return -EINVAL;
2050
2051         video = acpi_driver_data(device);
2052
2053         acpi_video_bus_stop_devices(video);
2054
2055         status = acpi_remove_notify_handler(video->device->handle,
2056                                             ACPI_DEVICE_NOTIFY,
2057                                             acpi_video_bus_notify);
2058
2059         acpi_video_bus_put_devices(video);
2060         acpi_video_bus_remove_fs(device);
2061
2062         input_unregister_device(video->input);
2063         kfree(video->attached_array);
2064         kfree(video);
2065
2066         return 0;
2067 }
2068
2069 static int __init acpi_video_init(void)
2070 {
2071         int result = 0;
2072
2073
2074         /*
2075            acpi_dbg_level = 0xFFFFFFFF;
2076            acpi_dbg_layer = 0x08000000;
2077          */
2078
2079         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2080         if (!acpi_video_dir)
2081                 return -ENODEV;
2082         acpi_video_dir->owner = THIS_MODULE;
2083
2084         result = acpi_bus_register_driver(&acpi_video_bus);
2085         if (result < 0) {
2086                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2087                 return -ENODEV;
2088         }
2089
2090         return 0;
2091 }
2092
2093 static void __exit acpi_video_exit(void)
2094 {
2095
2096         acpi_bus_unregister_driver(&acpi_video_bus);
2097
2098         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2099
2100         return;
2101 }
2102
2103 module_init(acpi_video_init);
2104 module_exit(acpi_video_exit);