980a74188781eba10b5372934de94bef0e2a2ea2
[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 ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
61 #define ACPI_VIDEO_HEAD_END             (~0u)
62 #define MAX_NAME_LEN    20
63
64 #define ACPI_VIDEO_DISPLAY_CRT  1
65 #define ACPI_VIDEO_DISPLAY_TV   2
66 #define ACPI_VIDEO_DISPLAY_DVI  3
67 #define ACPI_VIDEO_DISPLAY_LCD  4
68
69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
71
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
75
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
78
79 static int acpi_video_bus_add(struct acpi_device *device);
80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
81 static int acpi_video_resume(struct acpi_device *device);
82
83 static const struct acpi_device_id video_device_ids[] = {
84         {ACPI_VIDEO_HID, 0},
85         {"", 0},
86 };
87 MODULE_DEVICE_TABLE(acpi, video_device_ids);
88
89 static struct acpi_driver acpi_video_bus = {
90         .name = "video",
91         .class = ACPI_VIDEO_CLASS,
92         .ids = video_device_ids,
93         .ops = {
94                 .add = acpi_video_bus_add,
95                 .remove = acpi_video_bus_remove,
96                 .resume = acpi_video_resume,
97                 },
98 };
99
100 struct acpi_video_bus_flags {
101         u8 multihead:1;         /* can switch video heads */
102         u8 rom:1;               /* can retrieve a video rom */
103         u8 post:1;              /* can configure the head to */
104         u8 reserved:5;
105 };
106
107 struct acpi_video_bus_cap {
108         u8 _DOS:1;              /*Enable/Disable output switching */
109         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
110         u8 _ROM:1;              /*Get ROM Data */
111         u8 _GPD:1;              /*Get POST Device */
112         u8 _SPD:1;              /*Set POST Device */
113         u8 _VPO:1;              /*Video POST Options */
114         u8 reserved:2;
115 };
116
117 struct acpi_video_device_attrib {
118         u32 display_index:4;    /* A zero-based instance of the Display */
119         u32 display_port_attachment:4;  /*This field differentiates the display type */
120         u32 display_type:4;     /*Describe the specific type in use */
121         u32 vendor_specific:4;  /*Chipset Vendor Specific */
122         u32 bios_can_detect:1;  /*BIOS can detect the device */
123         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
124                                    the VGA device. */
125         u32 pipe_id:3;          /*For VGA multiple-head devices. */
126         u32 reserved:10;        /*Must be 0 */
127         u32 device_id_scheme:1; /*Device ID Scheme */
128 };
129
130 struct acpi_video_enumerated_device {
131         union {
132                 u32 int_val;
133                 struct acpi_video_device_attrib attrib;
134         } value;
135         struct acpi_video_device *bind_info;
136 };
137
138 struct acpi_video_bus {
139         struct acpi_device *device;
140         u8 dos_setting;
141         struct acpi_video_enumerated_device *attached_array;
142         u8 attached_count;
143         struct acpi_video_bus_cap cap;
144         struct acpi_video_bus_flags flags;
145         struct list_head video_device_list;
146         struct mutex device_list_lock;  /* protects video_device_list */
147         struct proc_dir_entry *dir;
148         struct input_dev *input;
149         char phys[32];  /* for input device */
150 };
151
152 struct acpi_video_device_flags {
153         u8 crt:1;
154         u8 lcd:1;
155         u8 tvout:1;
156         u8 dvi:1;
157         u8 bios:1;
158         u8 unknown:1;
159         u8 reserved:2;
160 };
161
162 struct acpi_video_device_cap {
163         u8 _ADR:1;              /*Return the unique ID */
164         u8 _BCL:1;              /*Query list of brightness control levels supported */
165         u8 _BCM:1;              /*Set the brightness level */
166         u8 _BQC:1;              /* Get current brightness level */
167         u8 _DDC:1;              /*Return the EDID for this device */
168         u8 _DCS:1;              /*Return status of output device */
169         u8 _DGS:1;              /*Query graphics state */
170         u8 _DSS:1;              /*Device state set */
171 };
172
173 struct acpi_video_device_brightness {
174         int curr;
175         int count;
176         int *levels;
177 };
178
179 struct acpi_video_device {
180         unsigned long device_id;
181         struct acpi_video_device_flags flags;
182         struct acpi_video_device_cap cap;
183         struct list_head entry;
184         struct acpi_video_bus *video;
185         struct acpi_device *dev;
186         struct acpi_video_device_brightness *brightness;
187         struct backlight_device *backlight;
188         struct thermal_cooling_device *cdev;
189         struct output_device *output_dev;
190 };
191
192 /* bus */
193 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
194 static struct file_operations acpi_video_bus_info_fops = {
195         .open = acpi_video_bus_info_open_fs,
196         .read = seq_read,
197         .llseek = seq_lseek,
198         .release = single_release,
199 };
200
201 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
202 static struct file_operations acpi_video_bus_ROM_fops = {
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         .open = acpi_video_bus_POST_info_open_fs,
213         .read = seq_read,
214         .llseek = seq_lseek,
215         .release = single_release,
216 };
217
218 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
219 static struct file_operations acpi_video_bus_POST_fops = {
220         .open = acpi_video_bus_POST_open_fs,
221         .read = seq_read,
222         .llseek = seq_lseek,
223         .release = single_release,
224 };
225
226 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
227 static struct file_operations acpi_video_bus_DOS_fops = {
228         .open = acpi_video_bus_DOS_open_fs,
229         .read = seq_read,
230         .llseek = seq_lseek,
231         .release = single_release,
232 };
233
234 /* device */
235 static int acpi_video_device_info_open_fs(struct inode *inode,
236                                           struct file *file);
237 static struct file_operations acpi_video_device_info_fops = {
238         .open = acpi_video_device_info_open_fs,
239         .read = seq_read,
240         .llseek = seq_lseek,
241         .release = single_release,
242 };
243
244 static int acpi_video_device_state_open_fs(struct inode *inode,
245                                            struct file *file);
246 static struct file_operations acpi_video_device_state_fops = {
247         .open = acpi_video_device_state_open_fs,
248         .read = seq_read,
249         .llseek = seq_lseek,
250         .release = single_release,
251 };
252
253 static int acpi_video_device_brightness_open_fs(struct inode *inode,
254                                                 struct file *file);
255 static struct file_operations acpi_video_device_brightness_fops = {
256         .open = acpi_video_device_brightness_open_fs,
257         .read = seq_read,
258         .llseek = seq_lseek,
259         .release = single_release,
260 };
261
262 static int acpi_video_device_EDID_open_fs(struct inode *inode,
263                                           struct file *file);
264 static struct file_operations acpi_video_device_EDID_fops = {
265         .open = acpi_video_device_EDID_open_fs,
266         .read = seq_read,
267         .llseek = seq_lseek,
268         .release = single_release,
269 };
270
271 static char device_decode[][30] = {
272         "motherboard VGA device",
273         "PCI VGA device",
274         "AGP VGA device",
275         "UNKNOWN",
276 };
277
278 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
279 static void acpi_video_device_rebind(struct acpi_video_bus *video);
280 static void acpi_video_device_bind(struct acpi_video_bus *video,
281                                    struct acpi_video_device *device);
282 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
283 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
284                         int level);
285 static int acpi_video_device_lcd_get_level_current(
286                         struct acpi_video_device *device,
287                         unsigned long *level);
288 static int acpi_video_get_next_level(struct acpi_video_device *device,
289                                      u32 level_current, u32 event);
290 static void acpi_video_switch_brightness(struct acpi_video_device *device,
291                                          int event);
292 static int acpi_video_device_get_state(struct acpi_video_device *device,
293                             unsigned long *state);
294 static int acpi_video_output_get(struct output_device *od);
295 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
296
297 /*backlight device sysfs support*/
298 static int acpi_video_get_brightness(struct backlight_device *bd)
299 {
300         unsigned long cur_level;
301         int i;
302         struct acpi_video_device *vd =
303                 (struct acpi_video_device *)bl_get_data(bd);
304         acpi_video_device_lcd_get_level_current(vd, &cur_level);
305         for (i = 2; i < vd->brightness->count; i++) {
306                 if (vd->brightness->levels[i] == cur_level)
307                         /* The first two entries are special - see page 575
308                            of the ACPI spec 3.0 */
309                         return i-2;
310         }
311         return 0;
312 }
313
314 static int acpi_video_set_brightness(struct backlight_device *bd)
315 {
316         int request_level = bd->props.brightness+2;
317         struct acpi_video_device *vd =
318                 (struct acpi_video_device *)bl_get_data(bd);
319         acpi_video_device_lcd_set_level(vd,
320                                         vd->brightness->levels[request_level]);
321         return 0;
322 }
323
324 static struct backlight_ops acpi_backlight_ops = {
325         .get_brightness = acpi_video_get_brightness,
326         .update_status  = acpi_video_set_brightness,
327 };
328
329 /*video output device sysfs support*/
330 static int acpi_video_output_get(struct output_device *od)
331 {
332         unsigned long state;
333         struct acpi_video_device *vd =
334                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
335         acpi_video_device_get_state(vd, &state);
336         return (int)state;
337 }
338
339 static int acpi_video_output_set(struct output_device *od)
340 {
341         unsigned long state = od->request_state;
342         struct acpi_video_device *vd=
343                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
344         return acpi_video_device_set_state(vd, state);
345 }
346
347 static struct output_properties acpi_output_properties = {
348         .set_state = acpi_video_output_set,
349         .get_status = acpi_video_output_get,
350 };
351
352
353 /* thermal cooling device callbacks */
354 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
355 {
356         struct acpi_device *device = cdev->devdata;
357         struct acpi_video_device *video = acpi_driver_data(device);
358
359         return sprintf(buf, "%d\n", video->brightness->count - 3);
360 }
361
362 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
363 {
364         struct acpi_device *device = cdev->devdata;
365         struct acpi_video_device *video = acpi_driver_data(device);
366         unsigned long level;
367         int state;
368
369         acpi_video_device_lcd_get_level_current(video, &level);
370         for (state = 2; state < video->brightness->count; state++)
371                 if (level == video->brightness->levels[state])
372                         return sprintf(buf, "%d\n",
373                                        video->brightness->count - state - 1);
374
375         return -EINVAL;
376 }
377
378 static int
379 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
380 {
381         struct acpi_device *device = cdev->devdata;
382         struct acpi_video_device *video = acpi_driver_data(device);
383         int level;
384
385         if ( state >= video->brightness->count - 2)
386                 return -EINVAL;
387
388         state = video->brightness->count - state;
389         level = video->brightness->levels[state -1];
390         return acpi_video_device_lcd_set_level(video, level);
391 }
392
393 static struct thermal_cooling_device_ops video_cooling_ops = {
394         .get_max_state = video_get_max_state,
395         .get_cur_state = video_get_cur_state,
396         .set_cur_state = video_set_cur_state,
397 };
398
399 /* --------------------------------------------------------------------------
400                                Video Management
401    -------------------------------------------------------------------------- */
402
403 /* device */
404
405 static int
406 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
407 {
408         int status;
409
410         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
411
412         return status;
413 }
414
415 static int
416 acpi_video_device_get_state(struct acpi_video_device *device,
417                             unsigned long *state)
418 {
419         int status;
420
421         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
422
423         return status;
424 }
425
426 static int
427 acpi_video_device_set_state(struct acpi_video_device *device, int state)
428 {
429         int status;
430         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
431         struct acpi_object_list args = { 1, &arg0 };
432         unsigned long ret;
433
434
435         arg0.integer.value = state;
436         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
437
438         return status;
439 }
440
441 static int
442 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
443                                    union acpi_object **levels)
444 {
445         int status;
446         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
447         union acpi_object *obj;
448
449
450         *levels = NULL;
451
452         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
453         if (!ACPI_SUCCESS(status))
454                 return status;
455         obj = (union acpi_object *)buffer.pointer;
456         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
457                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
458                 status = -EFAULT;
459                 goto err;
460         }
461
462         *levels = obj;
463
464         return 0;
465
466       err:
467         kfree(buffer.pointer);
468
469         return status;
470 }
471
472 static int
473 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
474 {
475         int status = AE_OK;
476         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
477         struct acpi_object_list args = { 1, &arg0 };
478
479
480         arg0.integer.value = level;
481
482         if (device->cap._BCM)
483                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
484                                               &args, NULL);
485         device->brightness->curr = level;
486         return status;
487 }
488
489 static int
490 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
491                                         unsigned long *level)
492 {
493         if (device->cap._BQC)
494                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
495                                              level);
496         *level = device->brightness->curr;
497         return AE_OK;
498 }
499
500 static int
501 acpi_video_device_EDID(struct acpi_video_device *device,
502                        union acpi_object **edid, ssize_t length)
503 {
504         int status;
505         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
506         union acpi_object *obj;
507         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
508         struct acpi_object_list args = { 1, &arg0 };
509
510
511         *edid = NULL;
512
513         if (!device)
514                 return -ENODEV;
515         if (length == 128)
516                 arg0.integer.value = 1;
517         else if (length == 256)
518                 arg0.integer.value = 2;
519         else
520                 return -EINVAL;
521
522         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
523         if (ACPI_FAILURE(status))
524                 return -ENODEV;
525
526         obj = buffer.pointer;
527
528         if (obj && obj->type == ACPI_TYPE_BUFFER)
529                 *edid = obj;
530         else {
531                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
532                 status = -EFAULT;
533                 kfree(obj);
534         }
535
536         return status;
537 }
538
539 /* bus */
540
541 static int
542 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
543 {
544         int status;
545         unsigned long tmp;
546         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
547         struct acpi_object_list args = { 1, &arg0 };
548
549
550         arg0.integer.value = option;
551
552         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
553         if (ACPI_SUCCESS(status))
554                 status = tmp ? (-EINVAL) : (AE_OK);
555
556         return status;
557 }
558
559 static int
560 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
561 {
562         int status;
563
564         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
565
566         return status;
567 }
568
569 static int
570 acpi_video_bus_POST_options(struct acpi_video_bus *video,
571                             unsigned long *options)
572 {
573         int status;
574
575         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
576         *options &= 3;
577
578         return status;
579 }
580
581 /*
582  *  Arg:
583  *      video           : video bus device pointer
584  *      bios_flag       : 
585  *              0.      The system BIOS should NOT automatically switch(toggle)
586  *                      the active display output.
587  *              1.      The system BIOS should automatically switch (toggle) the
588  *                      active display output. No switch event.
589  *              2.      The _DGS value should be locked.
590  *              3.      The system BIOS should not automatically switch (toggle) the
591  *                      active display output, but instead generate the display switch
592  *                      event notify code.
593  *      lcd_flag        :
594  *              0.      The system BIOS should automatically control the brightness level
595  *                      of the LCD when the power changes from AC to DC
596  *              1.      The system BIOS should NOT automatically control the brightness 
597  *                      level of the LCD when the power changes from AC to DC.
598  * Return Value:
599  *              -1      wrong arg.
600  */
601
602 static int
603 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
604 {
605         acpi_integer status = 0;
606         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
607         struct acpi_object_list args = { 1, &arg0 };
608
609
610         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
611                 status = -1;
612                 goto Failed;
613         }
614         arg0.integer.value = (lcd_flag << 2) | bios_flag;
615         video->dos_setting = arg0.integer.value;
616         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
617
618       Failed:
619         return status;
620 }
621
622 /*
623  *  Arg:        
624  *      device  : video output device (LCD, CRT, ..)
625  *
626  *  Return Value:
627  *      None
628  *
629  *  Find out all required AML methods defined under the output
630  *  device.
631  */
632
633 static void acpi_video_device_find_cap(struct acpi_video_device *device)
634 {
635         acpi_handle h_dummy1;
636         int i;
637         u32 max_level = 0;
638         union acpi_object *obj = NULL;
639         struct acpi_video_device_brightness *br = NULL;
640
641
642         memset(&device->cap, 0, sizeof(device->cap));
643
644         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
645                 device->cap._ADR = 1;
646         }
647         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
648                 device->cap._BCL = 1;
649         }
650         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
651                 device->cap._BCM = 1;
652         }
653         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
654                 device->cap._BQC = 1;
655         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
656                 device->cap._DDC = 1;
657         }
658         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
659                 device->cap._DCS = 1;
660         }
661         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
662                 device->cap._DGS = 1;
663         }
664         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
665                 device->cap._DSS = 1;
666         }
667
668         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
669
670                 if (obj->package.count >= 2) {
671                         int count = 0;
672                         union acpi_object *o;
673
674                         br = kzalloc(sizeof(*br), GFP_KERNEL);
675                         if (!br) {
676                                 printk(KERN_ERR "can't allocate memory\n");
677                         } else {
678                                 br->levels = kmalloc(obj->package.count *
679                                                      sizeof *(br->levels), GFP_KERNEL);
680                                 if (!br->levels)
681                                         goto out;
682
683                                 for (i = 0; i < obj->package.count; i++) {
684                                         o = (union acpi_object *)&obj->package.
685                                             elements[i];
686                                         if (o->type != ACPI_TYPE_INTEGER) {
687                                                 printk(KERN_ERR PREFIX "Invalid data\n");
688                                                 continue;
689                                         }
690                                         br->levels[count] = (u32) o->integer.value;
691
692                                         if (br->levels[count] > max_level)
693                                                 max_level = br->levels[count];
694                                         count++;
695                                 }
696                               out:
697                                 if (count < 2) {
698                                         kfree(br->levels);
699                                         kfree(br);
700                                 } else {
701                                         br->count = count;
702                                         device->brightness = br;
703                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
704                                                           "found %d brightness levels\n",
705                                                           count));
706                                 }
707                         }
708                 }
709
710         } else {
711                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
712         }
713
714         kfree(obj);
715
716         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
717                 int result;
718                 static int count = 0;
719                 char *name;
720                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
721                 if (!name)
722                         return;
723
724                 sprintf(name, "acpi_video%d", count++);
725                 device->backlight = backlight_device_register(name,
726                         NULL, device, &acpi_backlight_ops);
727                 device->backlight->props.max_brightness = device->brightness->count-3;
728                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
729                 backlight_update_status(device->backlight);
730                 kfree(name);
731
732                 device->cdev = thermal_cooling_device_register("LCD",
733                                         device->dev, &video_cooling_ops);
734                 if (IS_ERR(device->cdev))
735                         return;
736
737                 if (device->cdev) {
738                         printk(KERN_INFO PREFIX
739                                 "%s is registered as cooling_device%d\n",
740                                 device->dev->dev.bus_id, device->cdev->id);
741                         result = sysfs_create_link(&device->dev->dev.kobj,
742                                           &device->cdev->device.kobj,
743                                           "thermal_cooling");
744                         if (result)
745                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
746                         result = sysfs_create_link(&device->cdev->device.kobj,
747                                           &device->dev->dev.kobj,
748                                           "device");
749                         if (result)
750                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
751                 }
752         }
753         if (device->cap._DCS && device->cap._DSS){
754                 static int count = 0;
755                 char *name;
756                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
757                 if (!name)
758                         return;
759                 sprintf(name, "acpi_video%d", count++);
760                 device->output_dev = video_output_register(name,
761                                 NULL, device, &acpi_output_properties);
762                 kfree(name);
763         }
764         return;
765 }
766
767 /*
768  *  Arg:        
769  *      device  : video output device (VGA)
770  *
771  *  Return Value:
772  *      None
773  *
774  *  Find out all required AML methods defined under the video bus device.
775  */
776
777 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
778 {
779         acpi_handle h_dummy1;
780
781         memset(&video->cap, 0, sizeof(video->cap));
782         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
783                 video->cap._DOS = 1;
784         }
785         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
786                 video->cap._DOD = 1;
787         }
788         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
789                 video->cap._ROM = 1;
790         }
791         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
792                 video->cap._GPD = 1;
793         }
794         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
795                 video->cap._SPD = 1;
796         }
797         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
798                 video->cap._VPO = 1;
799         }
800 }
801
802 /*
803  * Check whether the video bus device has required AML method to
804  * support the desired features
805  */
806
807 static int acpi_video_bus_check(struct acpi_video_bus *video)
808 {
809         acpi_status status = -ENOENT;
810
811
812         if (!video)
813                 return -EINVAL;
814
815         /* Since there is no HID, CID and so on for VGA driver, we have
816          * to check well known required nodes.
817          */
818
819         /* Does this device support video switching? */
820         if (video->cap._DOS) {
821                 video->flags.multihead = 1;
822                 status = 0;
823         }
824
825         /* Does this device support retrieving a video ROM? */
826         if (video->cap._ROM) {
827                 video->flags.rom = 1;
828                 status = 0;
829         }
830
831         /* Does this device support configuring which video device to POST? */
832         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
833                 video->flags.post = 1;
834                 status = 0;
835         }
836
837         return status;
838 }
839
840 /* --------------------------------------------------------------------------
841                               FS Interface (/proc)
842    -------------------------------------------------------------------------- */
843
844 static struct proc_dir_entry *acpi_video_dir;
845
846 /* video devices */
847
848 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
849 {
850         struct acpi_video_device *dev = seq->private;
851
852
853         if (!dev)
854                 goto end;
855
856         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
857         seq_printf(seq, "type:         ");
858         if (dev->flags.crt)
859                 seq_printf(seq, "CRT\n");
860         else if (dev->flags.lcd)
861                 seq_printf(seq, "LCD\n");
862         else if (dev->flags.tvout)
863                 seq_printf(seq, "TVOUT\n");
864         else if (dev->flags.dvi)
865                 seq_printf(seq, "DVI\n");
866         else
867                 seq_printf(seq, "UNKNOWN\n");
868
869         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
870
871       end:
872         return 0;
873 }
874
875 static int
876 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
877 {
878         return single_open(file, acpi_video_device_info_seq_show,
879                            PDE(inode)->data);
880 }
881
882 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
883 {
884         int status;
885         struct acpi_video_device *dev = seq->private;
886         unsigned long state;
887
888
889         if (!dev)
890                 goto end;
891
892         status = acpi_video_device_get_state(dev, &state);
893         seq_printf(seq, "state:     ");
894         if (ACPI_SUCCESS(status))
895                 seq_printf(seq, "0x%02lx\n", state);
896         else
897                 seq_printf(seq, "<not supported>\n");
898
899         status = acpi_video_device_query(dev, &state);
900         seq_printf(seq, "query:     ");
901         if (ACPI_SUCCESS(status))
902                 seq_printf(seq, "0x%02lx\n", state);
903         else
904                 seq_printf(seq, "<not supported>\n");
905
906       end:
907         return 0;
908 }
909
910 static int
911 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
912 {
913         return single_open(file, acpi_video_device_state_seq_show,
914                            PDE(inode)->data);
915 }
916
917 static ssize_t
918 acpi_video_device_write_state(struct file *file,
919                               const char __user * buffer,
920                               size_t count, loff_t * data)
921 {
922         int status;
923         struct seq_file *m = file->private_data;
924         struct acpi_video_device *dev = m->private;
925         char str[12] = { 0 };
926         u32 state = 0;
927
928
929         if (!dev || count + 1 > sizeof str)
930                 return -EINVAL;
931
932         if (copy_from_user(str, buffer, count))
933                 return -EFAULT;
934
935         str[count] = 0;
936         state = simple_strtoul(str, NULL, 0);
937         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
938
939         status = acpi_video_device_set_state(dev, state);
940
941         if (status)
942                 return -EFAULT;
943
944         return count;
945 }
946
947 static int
948 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
949 {
950         struct acpi_video_device *dev = seq->private;
951         int i;
952
953
954         if (!dev || !dev->brightness) {
955                 seq_printf(seq, "<not supported>\n");
956                 return 0;
957         }
958
959         seq_printf(seq, "levels: ");
960         for (i = 0; i < dev->brightness->count; i++)
961                 seq_printf(seq, " %d", dev->brightness->levels[i]);
962         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
963
964         return 0;
965 }
966
967 static int
968 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
969 {
970         return single_open(file, acpi_video_device_brightness_seq_show,
971                            PDE(inode)->data);
972 }
973
974 static ssize_t
975 acpi_video_device_write_brightness(struct file *file,
976                                    const char __user * buffer,
977                                    size_t count, loff_t * data)
978 {
979         struct seq_file *m = file->private_data;
980         struct acpi_video_device *dev = m->private;
981         char str[5] = { 0 };
982         unsigned int level = 0;
983         int i;
984
985
986         if (!dev || !dev->brightness || count + 1 > sizeof str)
987                 return -EINVAL;
988
989         if (copy_from_user(str, buffer, count))
990                 return -EFAULT;
991
992         str[count] = 0;
993         level = simple_strtoul(str, NULL, 0);
994
995         if (level > 100)
996                 return -EFAULT;
997
998         /* validate through the list of available levels */
999         for (i = 0; i < dev->brightness->count; i++)
1000                 if (level == dev->brightness->levels[i]) {
1001                         if (ACPI_SUCCESS
1002                             (acpi_video_device_lcd_set_level(dev, level)))
1003                                 dev->brightness->curr = level;
1004                         break;
1005                 }
1006
1007         return count;
1008 }
1009
1010 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1011 {
1012         struct acpi_video_device *dev = seq->private;
1013         int status;
1014         int i;
1015         union acpi_object *edid = NULL;
1016
1017
1018         if (!dev)
1019                 goto out;
1020
1021         status = acpi_video_device_EDID(dev, &edid, 128);
1022         if (ACPI_FAILURE(status)) {
1023                 status = acpi_video_device_EDID(dev, &edid, 256);
1024         }
1025
1026         if (ACPI_FAILURE(status)) {
1027                 goto out;
1028         }
1029
1030         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1031                 for (i = 0; i < edid->buffer.length; i++)
1032                         seq_putc(seq, edid->buffer.pointer[i]);
1033         }
1034
1035       out:
1036         if (!edid)
1037                 seq_printf(seq, "<not supported>\n");
1038         else
1039                 kfree(edid);
1040
1041         return 0;
1042 }
1043
1044 static int
1045 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1046 {
1047         return single_open(file, acpi_video_device_EDID_seq_show,
1048                            PDE(inode)->data);
1049 }
1050
1051 static int acpi_video_device_add_fs(struct acpi_device *device)
1052 {
1053         struct proc_dir_entry *entry = NULL;
1054         struct acpi_video_device *vid_dev;
1055
1056
1057         if (!device)
1058                 return -ENODEV;
1059
1060         vid_dev = acpi_driver_data(device);
1061         if (!vid_dev)
1062                 return -ENODEV;
1063
1064         if (!acpi_device_dir(device)) {
1065                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1066                                                      vid_dev->video->dir);
1067                 if (!acpi_device_dir(device))
1068                         return -ENODEV;
1069                 acpi_device_dir(device)->owner = THIS_MODULE;
1070         }
1071
1072         /* 'info' [R] */
1073         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1074         if (!entry)
1075                 return -ENODEV;
1076         else {
1077                 entry->proc_fops = &acpi_video_device_info_fops;
1078                 entry->data = acpi_driver_data(device);
1079                 entry->owner = THIS_MODULE;
1080         }
1081
1082         /* 'state' [R/W] */
1083         entry =
1084             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1085                               acpi_device_dir(device));
1086         if (!entry)
1087                 return -ENODEV;
1088         else {
1089                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1090                 entry->proc_fops = &acpi_video_device_state_fops;
1091                 entry->data = acpi_driver_data(device);
1092                 entry->owner = THIS_MODULE;
1093         }
1094
1095         /* 'brightness' [R/W] */
1096         entry =
1097             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1098                               acpi_device_dir(device));
1099         if (!entry)
1100                 return -ENODEV;
1101         else {
1102                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1103                 entry->proc_fops = &acpi_video_device_brightness_fops;
1104                 entry->data = acpi_driver_data(device);
1105                 entry->owner = THIS_MODULE;
1106         }
1107
1108         /* 'EDID' [R] */
1109         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1110         if (!entry)
1111                 return -ENODEV;
1112         else {
1113                 entry->proc_fops = &acpi_video_device_EDID_fops;
1114                 entry->data = acpi_driver_data(device);
1115                 entry->owner = THIS_MODULE;
1116         }
1117
1118         return 0;
1119 }
1120
1121 static int acpi_video_device_remove_fs(struct acpi_device *device)
1122 {
1123         struct acpi_video_device *vid_dev;
1124
1125         vid_dev = acpi_driver_data(device);
1126         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1127                 return -ENODEV;
1128
1129         if (acpi_device_dir(device)) {
1130                 remove_proc_entry("info", acpi_device_dir(device));
1131                 remove_proc_entry("state", acpi_device_dir(device));
1132                 remove_proc_entry("brightness", acpi_device_dir(device));
1133                 remove_proc_entry("EDID", acpi_device_dir(device));
1134                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1135                 acpi_device_dir(device) = NULL;
1136         }
1137
1138         return 0;
1139 }
1140
1141 /* video bus */
1142 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1143 {
1144         struct acpi_video_bus *video = seq->private;
1145
1146
1147         if (!video)
1148                 goto end;
1149
1150         seq_printf(seq, "Switching heads:              %s\n",
1151                    video->flags.multihead ? "yes" : "no");
1152         seq_printf(seq, "Video ROM:                    %s\n",
1153                    video->flags.rom ? "yes" : "no");
1154         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1155                    video->flags.post ? "yes" : "no");
1156
1157       end:
1158         return 0;
1159 }
1160
1161 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1162 {
1163         return single_open(file, acpi_video_bus_info_seq_show,
1164                            PDE(inode)->data);
1165 }
1166
1167 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1168 {
1169         struct acpi_video_bus *video = seq->private;
1170
1171
1172         if (!video)
1173                 goto end;
1174
1175         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1176         seq_printf(seq, "<TODO>\n");
1177
1178       end:
1179         return 0;
1180 }
1181
1182 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1183 {
1184         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1185 }
1186
1187 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1188 {
1189         struct acpi_video_bus *video = seq->private;
1190         unsigned long options;
1191         int status;
1192
1193
1194         if (!video)
1195                 goto end;
1196
1197         status = acpi_video_bus_POST_options(video, &options);
1198         if (ACPI_SUCCESS(status)) {
1199                 if (!(options & 1)) {
1200                         printk(KERN_WARNING PREFIX
1201                                "The motherboard VGA device is not listed as a possible POST device.\n");
1202                         printk(KERN_WARNING PREFIX
1203                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1204                 }
1205                 printk("%lx\n", options);
1206                 seq_printf(seq, "can POST: <integrated video>");
1207                 if (options & 2)
1208                         seq_printf(seq, " <PCI video>");
1209                 if (options & 4)
1210                         seq_printf(seq, " <AGP video>");
1211                 seq_putc(seq, '\n');
1212         } else
1213                 seq_printf(seq, "<not supported>\n");
1214       end:
1215         return 0;
1216 }
1217
1218 static int
1219 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1220 {
1221         return single_open(file, acpi_video_bus_POST_info_seq_show,
1222                            PDE(inode)->data);
1223 }
1224
1225 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1226 {
1227         struct acpi_video_bus *video = seq->private;
1228         int status;
1229         unsigned long id;
1230
1231
1232         if (!video)
1233                 goto end;
1234
1235         status = acpi_video_bus_get_POST(video, &id);
1236         if (!ACPI_SUCCESS(status)) {
1237                 seq_printf(seq, "<not supported>\n");
1238                 goto end;
1239         }
1240         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1241
1242       end:
1243         return 0;
1244 }
1245
1246 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1247 {
1248         struct acpi_video_bus *video = seq->private;
1249
1250
1251         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1252
1253         return 0;
1254 }
1255
1256 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1257 {
1258         return single_open(file, acpi_video_bus_POST_seq_show,
1259                            PDE(inode)->data);
1260 }
1261
1262 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1263 {
1264         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1265 }
1266
1267 static ssize_t
1268 acpi_video_bus_write_POST(struct file *file,
1269                           const char __user * buffer,
1270                           size_t count, loff_t * data)
1271 {
1272         int status;
1273         struct seq_file *m = file->private_data;
1274         struct acpi_video_bus *video = m->private;
1275         char str[12] = { 0 };
1276         unsigned long opt, options;
1277
1278
1279         if (!video || count + 1 > sizeof str)
1280                 return -EINVAL;
1281
1282         status = acpi_video_bus_POST_options(video, &options);
1283         if (!ACPI_SUCCESS(status))
1284                 return -EINVAL;
1285
1286         if (copy_from_user(str, buffer, count))
1287                 return -EFAULT;
1288
1289         str[count] = 0;
1290         opt = strtoul(str, NULL, 0);
1291         if (opt > 3)
1292                 return -EFAULT;
1293
1294         /* just in case an OEM 'forgot' the motherboard... */
1295         options |= 1;
1296
1297         if (options & (1ul << opt)) {
1298                 status = acpi_video_bus_set_POST(video, opt);
1299                 if (!ACPI_SUCCESS(status))
1300                         return -EFAULT;
1301
1302         }
1303
1304         return count;
1305 }
1306
1307 static ssize_t
1308 acpi_video_bus_write_DOS(struct file *file,
1309                          const char __user * buffer,
1310                          size_t count, loff_t * data)
1311 {
1312         int status;
1313         struct seq_file *m = file->private_data;
1314         struct acpi_video_bus *video = m->private;
1315         char str[12] = { 0 };
1316         unsigned long opt;
1317
1318
1319         if (!video || count + 1 > sizeof str)
1320                 return -EINVAL;
1321
1322         if (copy_from_user(str, buffer, count))
1323                 return -EFAULT;
1324
1325         str[count] = 0;
1326         opt = strtoul(str, NULL, 0);
1327         if (opt > 7)
1328                 return -EFAULT;
1329
1330         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1331
1332         if (!ACPI_SUCCESS(status))
1333                 return -EFAULT;
1334
1335         return count;
1336 }
1337
1338 static int acpi_video_bus_add_fs(struct acpi_device *device)
1339 {
1340         struct proc_dir_entry *entry = NULL;
1341         struct acpi_video_bus *video;
1342
1343
1344         video = acpi_driver_data(device);
1345
1346         if (!acpi_device_dir(device)) {
1347                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1348                                                      acpi_video_dir);
1349                 if (!acpi_device_dir(device))
1350                         return -ENODEV;
1351                 video->dir = acpi_device_dir(device);
1352                 acpi_device_dir(device)->owner = THIS_MODULE;
1353         }
1354
1355         /* 'info' [R] */
1356         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1357         if (!entry)
1358                 return -ENODEV;
1359         else {
1360                 entry->proc_fops = &acpi_video_bus_info_fops;
1361                 entry->data = acpi_driver_data(device);
1362                 entry->owner = THIS_MODULE;
1363         }
1364
1365         /* 'ROM' [R] */
1366         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1367         if (!entry)
1368                 return -ENODEV;
1369         else {
1370                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1371                 entry->data = acpi_driver_data(device);
1372                 entry->owner = THIS_MODULE;
1373         }
1374
1375         /* 'POST_info' [R] */
1376         entry =
1377             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1378         if (!entry)
1379                 return -ENODEV;
1380         else {
1381                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1382                 entry->data = acpi_driver_data(device);
1383                 entry->owner = THIS_MODULE;
1384         }
1385
1386         /* 'POST' [R/W] */
1387         entry =
1388             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1389                               acpi_device_dir(device));
1390         if (!entry)
1391                 return -ENODEV;
1392         else {
1393                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1394                 entry->proc_fops = &acpi_video_bus_POST_fops;
1395                 entry->data = acpi_driver_data(device);
1396                 entry->owner = THIS_MODULE;
1397         }
1398
1399         /* 'DOS' [R/W] */
1400         entry =
1401             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1402                               acpi_device_dir(device));
1403         if (!entry)
1404                 return -ENODEV;
1405         else {
1406                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1407                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1408                 entry->data = acpi_driver_data(device);
1409                 entry->owner = THIS_MODULE;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1416 {
1417         struct acpi_video_bus *video;
1418
1419
1420         video = acpi_driver_data(device);
1421
1422         if (acpi_device_dir(device)) {
1423                 remove_proc_entry("info", acpi_device_dir(device));
1424                 remove_proc_entry("ROM", acpi_device_dir(device));
1425                 remove_proc_entry("POST_info", acpi_device_dir(device));
1426                 remove_proc_entry("POST", acpi_device_dir(device));
1427                 remove_proc_entry("DOS", acpi_device_dir(device));
1428                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1429                 acpi_device_dir(device) = NULL;
1430         }
1431
1432         return 0;
1433 }
1434
1435 /* --------------------------------------------------------------------------
1436                                  Driver Interface
1437    -------------------------------------------------------------------------- */
1438
1439 /* device interface */
1440 static struct acpi_video_device_attrib*
1441 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1442 {
1443         int count;
1444
1445         for(count = 0; count < video->attached_count; count++)
1446                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1447                         return &(video->attached_array[count].value.attrib);
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         int i;
1575
1576 #define IDS_VAL(i) video->attached_array[i].value.int_val
1577 #define IDS_BIND(i) video->attached_array[i].bind_info
1578
1579         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1580              i < video->attached_count; i++) {
1581                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1582                         IDS_BIND(i) = device;
1583                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1584                 }
1585         }
1586 #undef IDS_VAL
1587 #undef IDS_BIND
1588 }
1589
1590 /*
1591  *  Arg:
1592  *      video   : video bus device 
1593  *
1594  *  Return:
1595  *      < 0     : error
1596  *  
1597  *  Call _DOD to enumerate all devices attached to display adapter
1598  *
1599  */
1600
1601 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1602 {
1603         int status;
1604         int count;
1605         int i;
1606         struct acpi_video_enumerated_device *active_device_list;
1607         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1608         union acpi_object *dod = NULL;
1609         union acpi_object *obj;
1610
1611         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1612         if (!ACPI_SUCCESS(status)) {
1613                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1614                 return status;
1615         }
1616
1617         dod = buffer.pointer;
1618         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1619                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1620                 status = -EFAULT;
1621                 goto out;
1622         }
1623
1624         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1625                           dod->package.count));
1626
1627         active_device_list = kmalloc((1 +
1628                                       dod->package.count) *
1629                                      sizeof(struct
1630                                             acpi_video_enumerated_device),
1631                                      GFP_KERNEL);
1632
1633         if (!active_device_list) {
1634                 status = -ENOMEM;
1635                 goto out;
1636         }
1637
1638         count = 0;
1639         for (i = 0; i < dod->package.count; i++) {
1640                 obj = &dod->package.elements[i];
1641
1642                 if (obj->type != ACPI_TYPE_INTEGER) {
1643                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1644                         active_device_list[i].value.int_val =
1645                             ACPI_VIDEO_HEAD_INVALID;
1646                 }
1647                 active_device_list[i].value.int_val = obj->integer.value;
1648                 active_device_list[i].bind_info = NULL;
1649                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1650                                   (int)obj->integer.value));
1651                 count++;
1652         }
1653         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1654
1655         kfree(video->attached_array);
1656
1657         video->attached_array = active_device_list;
1658         video->attached_count = count;
1659       out:
1660         kfree(buffer.pointer);
1661         return status;
1662 }
1663
1664 static int
1665 acpi_video_get_next_level(struct acpi_video_device *device,
1666                           u32 level_current, u32 event)
1667 {
1668         int min, max, min_above, max_below, i, l, delta = 255;
1669         max = max_below = 0;
1670         min = min_above = 255;
1671         /* Find closest level to level_current */
1672         for (i = 0; i < device->brightness->count; i++) {
1673                 l = device->brightness->levels[i];
1674                 if (abs(l - level_current) < abs(delta)) {
1675                         delta = l - level_current;
1676                         if (!delta)
1677                                 break;
1678                 }
1679         }
1680         /* Ajust level_current to closest available level */
1681         level_current += delta;
1682         for (i = 0; i < device->brightness->count; i++) {
1683                 l = device->brightness->levels[i];
1684                 if (l < min)
1685                         min = l;
1686                 if (l > max)
1687                         max = l;
1688                 if (l < min_above && l > level_current)
1689                         min_above = l;
1690                 if (l > max_below && l < level_current)
1691                         max_below = l;
1692         }
1693
1694         switch (event) {
1695         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1696                 return (level_current < max) ? min_above : min;
1697         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1698                 return (level_current < max) ? min_above : max;
1699         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1700                 return (level_current > min) ? max_below : min;
1701         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1702         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1703                 return 0;
1704         default:
1705                 return level_current;
1706         }
1707 }
1708
1709 static void
1710 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1711 {
1712         unsigned long level_current, level_next;
1713         acpi_video_device_lcd_get_level_current(device, &level_current);
1714         level_next = acpi_video_get_next_level(device, level_current, event);
1715         acpi_video_device_lcd_set_level(device, level_next);
1716 }
1717
1718 static int
1719 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1720                            struct acpi_device *device)
1721 {
1722         int status = 0;
1723         struct acpi_device *dev;
1724
1725         acpi_video_device_enumerate(video);
1726
1727         list_for_each_entry(dev, &device->children, node) {
1728
1729                 status = acpi_video_bus_get_one_device(dev, video);
1730                 if (ACPI_FAILURE(status)) {
1731                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1732                         continue;
1733                 }
1734         }
1735         return status;
1736 }
1737
1738 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1739 {
1740         acpi_status status;
1741         struct acpi_video_bus *video;
1742
1743
1744         if (!device || !device->video)
1745                 return -ENOENT;
1746
1747         video = device->video;
1748
1749         acpi_video_device_remove_fs(device->dev);
1750
1751         status = acpi_remove_notify_handler(device->dev->handle,
1752                                             ACPI_DEVICE_NOTIFY,
1753                                             acpi_video_device_notify);
1754         backlight_device_unregister(device->backlight);
1755         if (device->cdev) {
1756                 sysfs_remove_link(&device->dev->dev.kobj,
1757                                   "thermal_cooling");
1758                 sysfs_remove_link(&device->cdev->device.kobj,
1759                                   "device");
1760                 thermal_cooling_device_unregister(device->cdev);
1761                 device->cdev = NULL;
1762         }
1763         video_output_unregister(device->output_dev);
1764
1765         return 0;
1766 }
1767
1768 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1769 {
1770         int status;
1771         struct acpi_video_device *dev, *next;
1772
1773         mutex_lock(&video->device_list_lock);
1774
1775         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1776
1777                 status = acpi_video_bus_put_one_device(dev);
1778                 if (ACPI_FAILURE(status))
1779                         printk(KERN_WARNING PREFIX
1780                                "hhuuhhuu bug in acpi video driver.\n");
1781
1782                 if (dev->brightness) {
1783                         kfree(dev->brightness->levels);
1784                         kfree(dev->brightness);
1785                 }
1786                 list_del(&dev->entry);
1787                 kfree(dev);
1788         }
1789
1790         mutex_unlock(&video->device_list_lock);
1791
1792         return 0;
1793 }
1794
1795 /* acpi_video interface */
1796
1797 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1798 {
1799         return acpi_video_bus_DOS(video, 0, 0);
1800 }
1801
1802 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1803 {
1804         return acpi_video_bus_DOS(video, 0, 1);
1805 }
1806
1807 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1808 {
1809         struct acpi_video_bus *video = data;
1810         struct acpi_device *device = NULL;
1811         struct input_dev *input;
1812         int keycode;
1813
1814         if (!video)
1815                 return;
1816
1817         device = video->device;
1818         input = video->input;
1819
1820         switch (event) {
1821         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1822                                          * most likely via hotkey. */
1823                 acpi_bus_generate_proc_event(device, event, 0);
1824                 keycode = KEY_SWITCHVIDEOMODE;
1825                 break;
1826
1827         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1828                                          * connector. */
1829                 acpi_video_device_enumerate(video);
1830                 acpi_video_device_rebind(video);
1831                 acpi_bus_generate_proc_event(device, event, 0);
1832                 keycode = KEY_SWITCHVIDEOMODE;
1833                 break;
1834
1835         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1836                 acpi_bus_generate_proc_event(device, event, 0);
1837                 keycode = KEY_SWITCHVIDEOMODE;
1838                 break;
1839         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1840                 acpi_bus_generate_proc_event(device, event, 0);
1841                 keycode = KEY_VIDEO_NEXT;
1842                 break;
1843         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1844                 acpi_bus_generate_proc_event(device, event, 0);
1845                 keycode = KEY_VIDEO_PREV;
1846                 break;
1847
1848         default:
1849                 keycode = KEY_UNKNOWN;
1850                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1851                                   "Unsupported event [0x%x]\n", event));
1852                 break;
1853         }
1854
1855         acpi_notifier_call_chain(device, event, 0);
1856         input_report_key(input, keycode, 1);
1857         input_sync(input);
1858         input_report_key(input, keycode, 0);
1859         input_sync(input);
1860
1861         return;
1862 }
1863
1864 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1865 {
1866         struct acpi_video_device *video_device = data;
1867         struct acpi_device *device = NULL;
1868         struct acpi_video_bus *bus;
1869         struct input_dev *input;
1870         int keycode;
1871
1872         if (!video_device)
1873                 return;
1874
1875         device = video_device->dev;
1876         bus = video_device->video;
1877         input = bus->input;
1878
1879         switch (event) {
1880         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle 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_BRIGHTNESS_CYCLE;
1885                 break;
1886         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase 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_BRIGHTNESSUP;
1891                 break;
1892         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
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_BRIGHTNESSDOWN;
1897                 break;
1898         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
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_BRIGHTNESS_ZERO;
1903                 break;
1904         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1905                 if (brightness_switch_enabled)
1906                         acpi_video_switch_brightness(video_device, event);
1907                 acpi_bus_generate_proc_event(device, event, 0);
1908                 keycode = KEY_DISPLAY_OFF;
1909                 break;
1910         default:
1911                 keycode = KEY_UNKNOWN;
1912                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1913                                   "Unsupported event [0x%x]\n", event));
1914                 break;
1915         }
1916
1917         acpi_notifier_call_chain(device, event, 0);
1918         input_report_key(input, keycode, 1);
1919         input_sync(input);
1920         input_report_key(input, keycode, 0);
1921         input_sync(input);
1922
1923         return;
1924 }
1925
1926 static int instance;
1927 static int acpi_video_resume(struct acpi_device *device)
1928 {
1929         struct acpi_video_bus *video;
1930         struct acpi_video_device *video_device;
1931         int i;
1932
1933         if (!device || !acpi_driver_data(device))
1934                 return -EINVAL;
1935
1936         video = acpi_driver_data(device);
1937
1938         for (i = 0; i < video->attached_count; i++) {
1939                 video_device = video->attached_array[i].bind_info;
1940                 if (video_device && video_device->backlight)
1941                         acpi_video_set_brightness(video_device->backlight);
1942         }
1943         return AE_OK;
1944 }
1945
1946 static int acpi_video_bus_add(struct acpi_device *device)
1947 {
1948         acpi_status status;
1949         struct acpi_video_bus *video;
1950         struct input_dev *input;
1951         int error;
1952
1953         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1954         if (!video)
1955                 return -ENOMEM;
1956
1957         /* a hack to fix the duplicate name "VID" problem on T61 */
1958         if (!strcmp(device->pnp.bus_id, "VID")) {
1959                 if (instance)
1960                         device->pnp.bus_id[3] = '0' + instance;
1961                 instance ++;
1962         }
1963
1964         video->device = device;
1965         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1966         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1967         acpi_driver_data(device) = video;
1968
1969         acpi_video_bus_find_cap(video);
1970         error = acpi_video_bus_check(video);
1971         if (error)
1972                 goto err_free_video;
1973
1974         error = acpi_video_bus_add_fs(device);
1975         if (error)
1976                 goto err_free_video;
1977
1978         mutex_init(&video->device_list_lock);
1979         INIT_LIST_HEAD(&video->video_device_list);
1980
1981         acpi_video_bus_get_devices(video, device);
1982         acpi_video_bus_start_devices(video);
1983
1984         status = acpi_install_notify_handler(device->handle,
1985                                              ACPI_DEVICE_NOTIFY,
1986                                              acpi_video_bus_notify, video);
1987         if (ACPI_FAILURE(status)) {
1988                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1989                                   "Error installing notify handler\n"));
1990                 error = -ENODEV;
1991                 goto err_stop_video;
1992         }
1993
1994         video->input = input = input_allocate_device();
1995         if (!input) {
1996                 error = -ENOMEM;
1997                 goto err_uninstall_notify;
1998         }
1999
2000         snprintf(video->phys, sizeof(video->phys),
2001                 "%s/video/input0", acpi_device_hid(video->device));
2002
2003         input->name = acpi_device_name(video->device);
2004         input->phys = video->phys;
2005         input->id.bustype = BUS_HOST;
2006         input->id.product = 0x06;
2007         input->dev.parent = &device->dev;
2008         input->evbit[0] = BIT(EV_KEY);
2009         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2010         set_bit(KEY_VIDEO_NEXT, input->keybit);
2011         set_bit(KEY_VIDEO_PREV, input->keybit);
2012         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2013         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2014         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2015         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2016         set_bit(KEY_DISPLAY_OFF, input->keybit);
2017         set_bit(KEY_UNKNOWN, input->keybit);
2018
2019         error = input_register_device(input);
2020         if (error)
2021                 goto err_free_input_dev;
2022
2023         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2024                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2025                video->flags.multihead ? "yes" : "no",
2026                video->flags.rom ? "yes" : "no",
2027                video->flags.post ? "yes" : "no");
2028
2029         return 0;
2030
2031  err_free_input_dev:
2032         input_free_device(input);
2033  err_uninstall_notify:
2034         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2035                                    acpi_video_bus_notify);
2036  err_stop_video:
2037         acpi_video_bus_stop_devices(video);
2038         acpi_video_bus_put_devices(video);
2039         kfree(video->attached_array);
2040         acpi_video_bus_remove_fs(device);
2041  err_free_video:
2042         kfree(video);
2043         acpi_driver_data(device) = NULL;
2044
2045         return error;
2046 }
2047
2048 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2049 {
2050         acpi_status status = 0;
2051         struct acpi_video_bus *video = NULL;
2052
2053
2054         if (!device || !acpi_driver_data(device))
2055                 return -EINVAL;
2056
2057         video = acpi_driver_data(device);
2058
2059         acpi_video_bus_stop_devices(video);
2060
2061         status = acpi_remove_notify_handler(video->device->handle,
2062                                             ACPI_DEVICE_NOTIFY,
2063                                             acpi_video_bus_notify);
2064
2065         acpi_video_bus_put_devices(video);
2066         acpi_video_bus_remove_fs(device);
2067
2068         input_unregister_device(video->input);
2069         kfree(video->attached_array);
2070         kfree(video);
2071
2072         return 0;
2073 }
2074
2075 static int __init acpi_video_init(void)
2076 {
2077         int result = 0;
2078
2079
2080         /*
2081            acpi_dbg_level = 0xFFFFFFFF;
2082            acpi_dbg_layer = 0x08000000;
2083          */
2084
2085         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2086         if (!acpi_video_dir)
2087                 return -ENODEV;
2088         acpi_video_dir->owner = THIS_MODULE;
2089
2090         result = acpi_bus_register_driver(&acpi_video_bus);
2091         if (result < 0) {
2092                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2093                 return -ENODEV;
2094         }
2095
2096         return 0;
2097 }
2098
2099 static void __exit acpi_video_exit(void)
2100 {
2101
2102         acpi_bus_unregister_driver(&acpi_video_bus);
2103
2104         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2105
2106         return;
2107 }
2108
2109 module_init(acpi_video_init);
2110 module_exit(acpi_video_exit);