Merge branches 'x86/prototypes', 'x86/x2apic' and 'x86/debug' into x86/core
[linux-2.6] / drivers / acpi / video.c
1 /*
2  *  video.c - ACPI Video Driver ($Revision:$)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or (at
13  *  your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  *  General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <asm/uaccess.h>
40
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43
44 #define ACPI_VIDEO_COMPONENT            0x08000000
45 #define ACPI_VIDEO_CLASS                "video"
46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
53
54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
59
60 #define MAX_NAME_LEN    20
61
62 #define ACPI_VIDEO_DISPLAY_CRT  1
63 #define ACPI_VIDEO_DISPLAY_TV   2
64 #define ACPI_VIDEO_DISPLAY_DVI  3
65 #define ACPI_VIDEO_DISPLAY_LCD  4
66
67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
69
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
73
74 static int brightness_switch_enabled = 1;
75 module_param(brightness_switch_enabled, bool, 0644);
76
77 static int acpi_video_bus_add(struct acpi_device *device);
78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
79 static int acpi_video_resume(struct acpi_device *device);
80
81 static const struct acpi_device_id video_device_ids[] = {
82         {ACPI_VIDEO_HID, 0},
83         {"", 0},
84 };
85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
86
87 static struct acpi_driver acpi_video_bus = {
88         .name = "video",
89         .class = ACPI_VIDEO_CLASS,
90         .ids = video_device_ids,
91         .ops = {
92                 .add = acpi_video_bus_add,
93                 .remove = acpi_video_bus_remove,
94                 .resume = acpi_video_resume,
95                 },
96 };
97
98 struct acpi_video_bus_flags {
99         u8 multihead:1;         /* can switch video heads */
100         u8 rom:1;               /* can retrieve a video rom */
101         u8 post:1;              /* can configure the head to */
102         u8 reserved:5;
103 };
104
105 struct acpi_video_bus_cap {
106         u8 _DOS:1;              /*Enable/Disable output switching */
107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
108         u8 _ROM:1;              /*Get ROM Data */
109         u8 _GPD:1;              /*Get POST Device */
110         u8 _SPD:1;              /*Set POST Device */
111         u8 _VPO:1;              /*Video POST Options */
112         u8 reserved:2;
113 };
114
115 struct acpi_video_device_attrib {
116         u32 display_index:4;    /* A zero-based instance of the Display */
117         u32 display_port_attachment:4;  /*This field differentiates the display type */
118         u32 display_type:4;     /*Describe the specific type in use */
119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
120         u32 bios_can_detect:1;  /*BIOS can detect the device */
121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
122                                    the VGA device. */
123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
124         u32 reserved:10;        /*Must be 0 */
125         u32 device_id_scheme:1; /*Device ID Scheme */
126 };
127
128 struct acpi_video_enumerated_device {
129         union {
130                 u32 int_val;
131                 struct acpi_video_device_attrib attrib;
132         } value;
133         struct acpi_video_device *bind_info;
134 };
135
136 struct acpi_video_bus {
137         struct acpi_device *device;
138         u8 dos_setting;
139         struct acpi_video_enumerated_device *attached_array;
140         u8 attached_count;
141         struct acpi_video_bus_cap cap;
142         struct acpi_video_bus_flags flags;
143         struct list_head video_device_list;
144         struct mutex device_list_lock;  /* protects video_device_list */
145         struct proc_dir_entry *dir;
146         struct input_dev *input;
147         char phys[32];  /* for input device */
148 };
149
150 struct acpi_video_device_flags {
151         u8 crt:1;
152         u8 lcd:1;
153         u8 tvout:1;
154         u8 dvi:1;
155         u8 bios:1;
156         u8 unknown:1;
157         u8 reserved:2;
158 };
159
160 struct acpi_video_device_cap {
161         u8 _ADR:1;              /*Return the unique ID */
162         u8 _BCL:1;              /*Query list of brightness control levels supported */
163         u8 _BCM:1;              /*Set the brightness level */
164         u8 _BQC:1;              /* Get current brightness level */
165         u8 _DDC:1;              /*Return the EDID for this device */
166         u8 _DCS:1;              /*Return status of output device */
167         u8 _DGS:1;              /*Query graphics state */
168         u8 _DSS:1;              /*Device state set */
169 };
170
171 struct acpi_video_device_brightness {
172         int curr;
173         int count;
174         int *levels;
175 };
176
177 struct acpi_video_device {
178         unsigned long device_id;
179         struct acpi_video_device_flags flags;
180         struct acpi_video_device_cap cap;
181         struct list_head entry;
182         struct acpi_video_bus *video;
183         struct acpi_device *dev;
184         struct acpi_video_device_brightness *brightness;
185         struct backlight_device *backlight;
186         struct thermal_cooling_device *cdev;
187         struct output_device *output_dev;
188 };
189
190 /* bus */
191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
192 static struct file_operations acpi_video_bus_info_fops = {
193         .owner = THIS_MODULE,
194         .open = acpi_video_bus_info_open_fs,
195         .read = seq_read,
196         .llseek = seq_lseek,
197         .release = single_release,
198 };
199
200 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
201 static struct file_operations acpi_video_bus_ROM_fops = {
202         .owner = THIS_MODULE,
203         .open = acpi_video_bus_ROM_open_fs,
204         .read = seq_read,
205         .llseek = seq_lseek,
206         .release = single_release,
207 };
208
209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
210                                             struct file *file);
211 static struct file_operations acpi_video_bus_POST_info_fops = {
212         .owner = THIS_MODULE,
213         .open = acpi_video_bus_POST_info_open_fs,
214         .read = seq_read,
215         .llseek = seq_lseek,
216         .release = single_release,
217 };
218
219 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
220 static struct file_operations acpi_video_bus_POST_fops = {
221         .owner = THIS_MODULE,
222         .open = acpi_video_bus_POST_open_fs,
223         .read = seq_read,
224         .llseek = seq_lseek,
225         .release = single_release,
226 };
227
228 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
229 static struct file_operations acpi_video_bus_DOS_fops = {
230         .owner = THIS_MODULE,
231         .open = acpi_video_bus_DOS_open_fs,
232         .read = seq_read,
233         .llseek = seq_lseek,
234         .release = single_release,
235 };
236
237 /* device */
238 static int acpi_video_device_info_open_fs(struct inode *inode,
239                                           struct file *file);
240 static struct file_operations acpi_video_device_info_fops = {
241         .owner = THIS_MODULE,
242         .open = acpi_video_device_info_open_fs,
243         .read = seq_read,
244         .llseek = seq_lseek,
245         .release = single_release,
246 };
247
248 static int acpi_video_device_state_open_fs(struct inode *inode,
249                                            struct file *file);
250 static struct file_operations acpi_video_device_state_fops = {
251         .owner = THIS_MODULE,
252         .open = acpi_video_device_state_open_fs,
253         .read = seq_read,
254         .llseek = seq_lseek,
255         .release = single_release,
256 };
257
258 static int acpi_video_device_brightness_open_fs(struct inode *inode,
259                                                 struct file *file);
260 static struct file_operations acpi_video_device_brightness_fops = {
261         .owner = THIS_MODULE,
262         .open = acpi_video_device_brightness_open_fs,
263         .read = seq_read,
264         .llseek = seq_lseek,
265         .release = single_release,
266 };
267
268 static int acpi_video_device_EDID_open_fs(struct inode *inode,
269                                           struct file *file);
270 static struct file_operations acpi_video_device_EDID_fops = {
271         .owner = THIS_MODULE,
272         .open = acpi_video_device_EDID_open_fs,
273         .read = seq_read,
274         .llseek = seq_lseek,
275         .release = single_release,
276 };
277
278 static char device_decode[][30] = {
279         "motherboard VGA device",
280         "PCI VGA device",
281         "AGP VGA device",
282         "UNKNOWN",
283 };
284
285 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
286 static void acpi_video_device_rebind(struct acpi_video_bus *video);
287 static void acpi_video_device_bind(struct acpi_video_bus *video,
288                                    struct acpi_video_device *device);
289 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
290 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
291                         int level);
292 static int acpi_video_device_lcd_get_level_current(
293                         struct acpi_video_device *device,
294                         unsigned long *level);
295 static int acpi_video_get_next_level(struct acpi_video_device *device,
296                                      u32 level_current, u32 event);
297 static void acpi_video_switch_brightness(struct acpi_video_device *device,
298                                          int event);
299 static int acpi_video_device_get_state(struct acpi_video_device *device,
300                             unsigned long *state);
301 static int acpi_video_output_get(struct output_device *od);
302 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
303
304 /*backlight device sysfs support*/
305 static int acpi_video_get_brightness(struct backlight_device *bd)
306 {
307         unsigned long cur_level;
308         int i;
309         struct acpi_video_device *vd =
310                 (struct acpi_video_device *)bl_get_data(bd);
311         acpi_video_device_lcd_get_level_current(vd, &cur_level);
312         for (i = 2; i < vd->brightness->count; i++) {
313                 if (vd->brightness->levels[i] == cur_level)
314                         /* The first two entries are special - see page 575
315                            of the ACPI spec 3.0 */
316                         return i-2;
317         }
318         return 0;
319 }
320
321 static int acpi_video_set_brightness(struct backlight_device *bd)
322 {
323         int request_level = bd->props.brightness+2;
324         struct acpi_video_device *vd =
325                 (struct acpi_video_device *)bl_get_data(bd);
326         acpi_video_device_lcd_set_level(vd,
327                                         vd->brightness->levels[request_level]);
328         return 0;
329 }
330
331 static struct backlight_ops acpi_backlight_ops = {
332         .get_brightness = acpi_video_get_brightness,
333         .update_status  = acpi_video_set_brightness,
334 };
335
336 /*video output device sysfs support*/
337 static int acpi_video_output_get(struct output_device *od)
338 {
339         unsigned long state;
340         struct acpi_video_device *vd =
341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
342         acpi_video_device_get_state(vd, &state);
343         return (int)state;
344 }
345
346 static int acpi_video_output_set(struct output_device *od)
347 {
348         unsigned long state = od->request_state;
349         struct acpi_video_device *vd=
350                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
351         return acpi_video_device_set_state(vd, state);
352 }
353
354 static struct output_properties acpi_output_properties = {
355         .set_state = acpi_video_output_set,
356         .get_status = acpi_video_output_get,
357 };
358
359
360 /* thermal cooling device callbacks */
361 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
362 {
363         struct acpi_device *device = cdev->devdata;
364         struct acpi_video_device *video = acpi_driver_data(device);
365
366         return sprintf(buf, "%d\n", video->brightness->count - 3);
367 }
368
369 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
370 {
371         struct acpi_device *device = cdev->devdata;
372         struct acpi_video_device *video = acpi_driver_data(device);
373         unsigned long level;
374         int state;
375
376         acpi_video_device_lcd_get_level_current(video, &level);
377         for (state = 2; state < video->brightness->count; state++)
378                 if (level == video->brightness->levels[state])
379                         return sprintf(buf, "%d\n",
380                                        video->brightness->count - state - 1);
381
382         return -EINVAL;
383 }
384
385 static int
386 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
387 {
388         struct acpi_device *device = cdev->devdata;
389         struct acpi_video_device *video = acpi_driver_data(device);
390         int level;
391
392         if ( state >= video->brightness->count - 2)
393                 return -EINVAL;
394
395         state = video->brightness->count - state;
396         level = video->brightness->levels[state -1];
397         return acpi_video_device_lcd_set_level(video, level);
398 }
399
400 static struct thermal_cooling_device_ops video_cooling_ops = {
401         .get_max_state = video_get_max_state,
402         .get_cur_state = video_get_cur_state,
403         .set_cur_state = video_set_cur_state,
404 };
405
406 /* --------------------------------------------------------------------------
407                                Video Management
408    -------------------------------------------------------------------------- */
409
410 /* device */
411
412 static int
413 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
414 {
415         int status;
416
417         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
418
419         return status;
420 }
421
422 static int
423 acpi_video_device_get_state(struct acpi_video_device *device,
424                             unsigned long *state)
425 {
426         int status;
427
428         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
429
430         return status;
431 }
432
433 static int
434 acpi_video_device_set_state(struct acpi_video_device *device, int state)
435 {
436         int status;
437         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
438         struct acpi_object_list args = { 1, &arg0 };
439         unsigned long ret;
440
441
442         arg0.integer.value = state;
443         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
444
445         return status;
446 }
447
448 static int
449 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
450                                    union acpi_object **levels)
451 {
452         int status;
453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
454         union acpi_object *obj;
455
456
457         *levels = NULL;
458
459         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
460         if (!ACPI_SUCCESS(status))
461                 return status;
462         obj = (union acpi_object *)buffer.pointer;
463         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
464                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
465                 status = -EFAULT;
466                 goto err;
467         }
468
469         *levels = obj;
470
471         return 0;
472
473       err:
474         kfree(buffer.pointer);
475
476         return status;
477 }
478
479 static int
480 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
481 {
482         int status = AE_OK;
483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
484         struct acpi_object_list args = { 1, &arg0 };
485
486
487         arg0.integer.value = level;
488
489         if (device->cap._BCM)
490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
491                                               &args, NULL);
492         device->brightness->curr = level;
493         return status;
494 }
495
496 static int
497 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
498                                         unsigned long *level)
499 {
500         if (device->cap._BQC)
501                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
502                                              level);
503         *level = device->brightness->curr;
504         return AE_OK;
505 }
506
507 static int
508 acpi_video_device_EDID(struct acpi_video_device *device,
509                        union acpi_object **edid, ssize_t length)
510 {
511         int status;
512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
513         union acpi_object *obj;
514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
515         struct acpi_object_list args = { 1, &arg0 };
516
517
518         *edid = NULL;
519
520         if (!device)
521                 return -ENODEV;
522         if (length == 128)
523                 arg0.integer.value = 1;
524         else if (length == 256)
525                 arg0.integer.value = 2;
526         else
527                 return -EINVAL;
528
529         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
530         if (ACPI_FAILURE(status))
531                 return -ENODEV;
532
533         obj = buffer.pointer;
534
535         if (obj && obj->type == ACPI_TYPE_BUFFER)
536                 *edid = obj;
537         else {
538                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
539                 status = -EFAULT;
540                 kfree(obj);
541         }
542
543         return status;
544 }
545
546 /* bus */
547
548 static int
549 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
550 {
551         int status;
552         unsigned long tmp;
553         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
554         struct acpi_object_list args = { 1, &arg0 };
555
556
557         arg0.integer.value = option;
558
559         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
560         if (ACPI_SUCCESS(status))
561                 status = tmp ? (-EINVAL) : (AE_OK);
562
563         return status;
564 }
565
566 static int
567 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
568 {
569         int status;
570
571         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
572
573         return status;
574 }
575
576 static int
577 acpi_video_bus_POST_options(struct acpi_video_bus *video,
578                             unsigned long *options)
579 {
580         int status;
581
582         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
583         *options &= 3;
584
585         return status;
586 }
587
588 /*
589  *  Arg:
590  *      video           : video bus device pointer
591  *      bios_flag       : 
592  *              0.      The system BIOS should NOT automatically switch(toggle)
593  *                      the active display output.
594  *              1.      The system BIOS should automatically switch (toggle) the
595  *                      active display output. No switch event.
596  *              2.      The _DGS value should be locked.
597  *              3.      The system BIOS should not automatically switch (toggle) the
598  *                      active display output, but instead generate the display switch
599  *                      event notify code.
600  *      lcd_flag        :
601  *              0.      The system BIOS should automatically control the brightness level
602  *                      of the LCD when the power changes from AC to DC
603  *              1.      The system BIOS should NOT automatically control the brightness 
604  *                      level of the LCD when the power changes from AC to DC.
605  * Return Value:
606  *              -1      wrong arg.
607  */
608
609 static int
610 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
611 {
612         acpi_integer status = 0;
613         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
614         struct acpi_object_list args = { 1, &arg0 };
615
616
617         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
618                 status = -1;
619                 goto Failed;
620         }
621         arg0.integer.value = (lcd_flag << 2) | bios_flag;
622         video->dos_setting = arg0.integer.value;
623         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
624
625       Failed:
626         return status;
627 }
628
629 /*
630  *  Arg:        
631  *      device  : video output device (LCD, CRT, ..)
632  *
633  *  Return Value:
634  *      Maximum brightness level
635  *
636  *  Allocate and initialize device->brightness.
637  */
638
639 static int
640 acpi_video_init_brightness(struct acpi_video_device *device)
641 {
642         union acpi_object *obj = NULL;
643         int i, max_level = 0, count = 0;
644         union acpi_object *o;
645         struct acpi_video_device_brightness *br = NULL;
646
647         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
648                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
649                                                 "LCD brightness level\n"));
650                 goto out;
651         }
652
653         if (obj->package.count < 2)
654                 goto out;
655
656         br = kzalloc(sizeof(*br), GFP_KERNEL);
657         if (!br) {
658                 printk(KERN_ERR "can't allocate memory\n");
659                 goto out;
660         }
661
662         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
663                                 GFP_KERNEL);
664         if (!br->levels)
665                 goto out_free;
666
667         for (i = 0; i < obj->package.count; i++) {
668                 o = (union acpi_object *)&obj->package.elements[i];
669                 if (o->type != ACPI_TYPE_INTEGER) {
670                         printk(KERN_ERR PREFIX "Invalid data\n");
671                         continue;
672                 }
673                 br->levels[count] = (u32) o->integer.value;
674
675                 if (br->levels[count] > max_level)
676                         max_level = br->levels[count];
677                 count++;
678         }
679
680         if (count < 2)
681                 goto out_free_levels;
682
683         br->count = count;
684         device->brightness = br;
685         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
686         kfree(obj);
687         return max_level;
688
689 out_free_levels:
690         kfree(br->levels);
691 out_free:
692         kfree(br);
693 out:
694         device->brightness = NULL;
695         kfree(obj);
696         return 0;
697 }
698
699 /*
700  *  Arg:
701  *      device  : video output device (LCD, CRT, ..)
702  *
703  *  Return Value:
704  *      None
705  *
706  *  Find out all required AML methods defined under the output
707  *  device.
708  */
709
710 static void acpi_video_device_find_cap(struct acpi_video_device *device)
711 {
712         acpi_handle h_dummy1;
713         u32 max_level = 0;
714
715
716         memset(&device->cap, 0, sizeof(device->cap));
717
718         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
719                 device->cap._ADR = 1;
720         }
721         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
722                 device->cap._BCL = 1;
723         }
724         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
725                 device->cap._BCM = 1;
726         }
727         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
728                 device->cap._BQC = 1;
729         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
730                 device->cap._DDC = 1;
731         }
732         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
733                 device->cap._DCS = 1;
734         }
735         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
736                 device->cap._DGS = 1;
737         }
738         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
739                 device->cap._DSS = 1;
740         }
741
742         max_level = acpi_video_init_brightness(device);
743
744         if (device->cap._BCL && device->cap._BCM && max_level > 0) {
745                 int result;
746                 static int count = 0;
747                 char *name;
748                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
749                 if (!name)
750                         return;
751
752                 sprintf(name, "acpi_video%d", count++);
753                 device->backlight = backlight_device_register(name,
754                         NULL, device, &acpi_backlight_ops);
755                 device->backlight->props.max_brightness = device->brightness->count-3;
756                 /*
757                  * If there exists the _BQC object, the _BQC object will be
758                  * called to get the current backlight brightness. Otherwise
759                  * the brightness will be set to the maximum.
760                  */
761                 if (device->cap._BQC)
762                         device->backlight->props.brightness =
763                                 acpi_video_get_brightness(device->backlight);
764                 else
765                         device->backlight->props.brightness =
766                                 device->backlight->props.max_brightness;
767                 backlight_update_status(device->backlight);
768                 kfree(name);
769
770                 device->cdev = thermal_cooling_device_register("LCD",
771                                         device->dev, &video_cooling_ops);
772                 if (IS_ERR(device->cdev))
773                         return;
774
775                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
776                          device->cdev->id);
777                 result = sysfs_create_link(&device->dev->dev.kobj,
778                                 &device->cdev->device.kobj,
779                                 "thermal_cooling");
780                 if (result)
781                         printk(KERN_ERR PREFIX "Create sysfs link\n");
782                 result = sysfs_create_link(&device->cdev->device.kobj,
783                                 &device->dev->dev.kobj, "device");
784                 if (result)
785                         printk(KERN_ERR PREFIX "Create sysfs link\n");
786
787         }
788         if (device->cap._DCS && device->cap._DSS){
789                 static int count = 0;
790                 char *name;
791                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
792                 if (!name)
793                         return;
794                 sprintf(name, "acpi_video%d", count++);
795                 device->output_dev = video_output_register(name,
796                                 NULL, device, &acpi_output_properties);
797                 kfree(name);
798         }
799         return;
800 }
801
802 /*
803  *  Arg:        
804  *      device  : video output device (VGA)
805  *
806  *  Return Value:
807  *      None
808  *
809  *  Find out all required AML methods defined under the video bus device.
810  */
811
812 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
813 {
814         acpi_handle h_dummy1;
815
816         memset(&video->cap, 0, sizeof(video->cap));
817         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
818                 video->cap._DOS = 1;
819         }
820         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
821                 video->cap._DOD = 1;
822         }
823         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
824                 video->cap._ROM = 1;
825         }
826         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
827                 video->cap._GPD = 1;
828         }
829         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
830                 video->cap._SPD = 1;
831         }
832         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
833                 video->cap._VPO = 1;
834         }
835 }
836
837 /*
838  * Check whether the video bus device has required AML method to
839  * support the desired features
840  */
841
842 static int acpi_video_bus_check(struct acpi_video_bus *video)
843 {
844         acpi_status status = -ENOENT;
845
846
847         if (!video)
848                 return -EINVAL;
849
850         /* Since there is no HID, CID and so on for VGA driver, we have
851          * to check well known required nodes.
852          */
853
854         /* Does this device support video switching? */
855         if (video->cap._DOS) {
856                 video->flags.multihead = 1;
857                 status = 0;
858         }
859
860         /* Does this device support retrieving a video ROM? */
861         if (video->cap._ROM) {
862                 video->flags.rom = 1;
863                 status = 0;
864         }
865
866         /* Does this device support configuring which video device to POST? */
867         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
868                 video->flags.post = 1;
869                 status = 0;
870         }
871
872         return status;
873 }
874
875 /* --------------------------------------------------------------------------
876                               FS Interface (/proc)
877    -------------------------------------------------------------------------- */
878
879 static struct proc_dir_entry *acpi_video_dir;
880
881 /* video devices */
882
883 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
884 {
885         struct acpi_video_device *dev = seq->private;
886
887
888         if (!dev)
889                 goto end;
890
891         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
892         seq_printf(seq, "type:         ");
893         if (dev->flags.crt)
894                 seq_printf(seq, "CRT\n");
895         else if (dev->flags.lcd)
896                 seq_printf(seq, "LCD\n");
897         else if (dev->flags.tvout)
898                 seq_printf(seq, "TVOUT\n");
899         else if (dev->flags.dvi)
900                 seq_printf(seq, "DVI\n");
901         else
902                 seq_printf(seq, "UNKNOWN\n");
903
904         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
905
906       end:
907         return 0;
908 }
909
910 static int
911 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
912 {
913         return single_open(file, acpi_video_device_info_seq_show,
914                            PDE(inode)->data);
915 }
916
917 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
918 {
919         int status;
920         struct acpi_video_device *dev = seq->private;
921         unsigned long state;
922
923
924         if (!dev)
925                 goto end;
926
927         status = acpi_video_device_get_state(dev, &state);
928         seq_printf(seq, "state:     ");
929         if (ACPI_SUCCESS(status))
930                 seq_printf(seq, "0x%02lx\n", state);
931         else
932                 seq_printf(seq, "<not supported>\n");
933
934         status = acpi_video_device_query(dev, &state);
935         seq_printf(seq, "query:     ");
936         if (ACPI_SUCCESS(status))
937                 seq_printf(seq, "0x%02lx\n", state);
938         else
939                 seq_printf(seq, "<not supported>\n");
940
941       end:
942         return 0;
943 }
944
945 static int
946 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
947 {
948         return single_open(file, acpi_video_device_state_seq_show,
949                            PDE(inode)->data);
950 }
951
952 static ssize_t
953 acpi_video_device_write_state(struct file *file,
954                               const char __user * buffer,
955                               size_t count, loff_t * data)
956 {
957         int status;
958         struct seq_file *m = file->private_data;
959         struct acpi_video_device *dev = m->private;
960         char str[12] = { 0 };
961         u32 state = 0;
962
963
964         if (!dev || count + 1 > sizeof str)
965                 return -EINVAL;
966
967         if (copy_from_user(str, buffer, count))
968                 return -EFAULT;
969
970         str[count] = 0;
971         state = simple_strtoul(str, NULL, 0);
972         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
973
974         status = acpi_video_device_set_state(dev, state);
975
976         if (status)
977                 return -EFAULT;
978
979         return count;
980 }
981
982 static int
983 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
984 {
985         struct acpi_video_device *dev = seq->private;
986         int i;
987
988
989         if (!dev || !dev->brightness) {
990                 seq_printf(seq, "<not supported>\n");
991                 return 0;
992         }
993
994         seq_printf(seq, "levels: ");
995         for (i = 0; i < dev->brightness->count; i++)
996                 seq_printf(seq, " %d", dev->brightness->levels[i]);
997         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
998
999         return 0;
1000 }
1001
1002 static int
1003 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1004 {
1005         return single_open(file, acpi_video_device_brightness_seq_show,
1006                            PDE(inode)->data);
1007 }
1008
1009 static ssize_t
1010 acpi_video_device_write_brightness(struct file *file,
1011                                    const char __user * buffer,
1012                                    size_t count, loff_t * data)
1013 {
1014         struct seq_file *m = file->private_data;
1015         struct acpi_video_device *dev = m->private;
1016         char str[5] = { 0 };
1017         unsigned int level = 0;
1018         int i;
1019
1020
1021         if (!dev || !dev->brightness || count + 1 > sizeof str)
1022                 return -EINVAL;
1023
1024         if (copy_from_user(str, buffer, count))
1025                 return -EFAULT;
1026
1027         str[count] = 0;
1028         level = simple_strtoul(str, NULL, 0);
1029
1030         if (level > 100)
1031                 return -EFAULT;
1032
1033         /* validate through the list of available levels */
1034         for (i = 0; i < dev->brightness->count; i++)
1035                 if (level == dev->brightness->levels[i]) {
1036                         if (ACPI_SUCCESS
1037                             (acpi_video_device_lcd_set_level(dev, level)))
1038                                 dev->brightness->curr = level;
1039                         break;
1040                 }
1041
1042         return count;
1043 }
1044
1045 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1046 {
1047         struct acpi_video_device *dev = seq->private;
1048         int status;
1049         int i;
1050         union acpi_object *edid = NULL;
1051
1052
1053         if (!dev)
1054                 goto out;
1055
1056         status = acpi_video_device_EDID(dev, &edid, 128);
1057         if (ACPI_FAILURE(status)) {
1058                 status = acpi_video_device_EDID(dev, &edid, 256);
1059         }
1060
1061         if (ACPI_FAILURE(status)) {
1062                 goto out;
1063         }
1064
1065         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1066                 for (i = 0; i < edid->buffer.length; i++)
1067                         seq_putc(seq, edid->buffer.pointer[i]);
1068         }
1069
1070       out:
1071         if (!edid)
1072                 seq_printf(seq, "<not supported>\n");
1073         else
1074                 kfree(edid);
1075
1076         return 0;
1077 }
1078
1079 static int
1080 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1081 {
1082         return single_open(file, acpi_video_device_EDID_seq_show,
1083                            PDE(inode)->data);
1084 }
1085
1086 static int acpi_video_device_add_fs(struct acpi_device *device)
1087 {
1088         struct proc_dir_entry *entry, *device_dir;
1089         struct acpi_video_device *vid_dev;
1090
1091         vid_dev = acpi_driver_data(device);
1092         if (!vid_dev)
1093                 return -ENODEV;
1094
1095         device_dir = proc_mkdir(acpi_device_bid(device),
1096                                 vid_dev->video->dir);
1097         if (!device_dir)
1098                 return -ENOMEM;
1099
1100         device_dir->owner = THIS_MODULE;
1101
1102         /* 'info' [R] */
1103         entry = proc_create_data("info", S_IRUGO, device_dir,
1104                         &acpi_video_device_info_fops, acpi_driver_data(device));
1105         if (!entry)
1106                 goto err_remove_dir;
1107
1108         /* 'state' [R/W] */
1109         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1110         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1111                                  device_dir,
1112                                  &acpi_video_device_state_fops,
1113                                  acpi_driver_data(device));
1114         if (!entry)
1115                 goto err_remove_info;
1116
1117         /* 'brightness' [R/W] */
1118         acpi_video_device_brightness_fops.write =
1119                 acpi_video_device_write_brightness;
1120         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1121                                  device_dir,
1122                                  &acpi_video_device_brightness_fops,
1123                                  acpi_driver_data(device));
1124         if (!entry)
1125                 goto err_remove_state;
1126
1127         /* 'EDID' [R] */
1128         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1129                                  &acpi_video_device_EDID_fops,
1130                                  acpi_driver_data(device));
1131         if (!entry)
1132                 goto err_remove_brightness;
1133
1134         acpi_device_dir(device) = device_dir;
1135
1136         return 0;
1137
1138  err_remove_brightness:
1139         remove_proc_entry("brightness", device_dir);
1140  err_remove_state:
1141         remove_proc_entry("state", device_dir);
1142  err_remove_info:
1143         remove_proc_entry("info", device_dir);
1144  err_remove_dir:
1145         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1146         return -ENOMEM;
1147 }
1148
1149 static int acpi_video_device_remove_fs(struct acpi_device *device)
1150 {
1151         struct acpi_video_device *vid_dev;
1152         struct proc_dir_entry *device_dir;
1153
1154         vid_dev = acpi_driver_data(device);
1155         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1156                 return -ENODEV;
1157
1158         device_dir = acpi_device_dir(device);
1159         if (device_dir) {
1160                 remove_proc_entry("info", device_dir);
1161                 remove_proc_entry("state", device_dir);
1162                 remove_proc_entry("brightness", device_dir);
1163                 remove_proc_entry("EDID", device_dir);
1164                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1165                 acpi_device_dir(device) = NULL;
1166         }
1167
1168         return 0;
1169 }
1170
1171 /* video bus */
1172 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1173 {
1174         struct acpi_video_bus *video = seq->private;
1175
1176
1177         if (!video)
1178                 goto end;
1179
1180         seq_printf(seq, "Switching heads:              %s\n",
1181                    video->flags.multihead ? "yes" : "no");
1182         seq_printf(seq, "Video ROM:                    %s\n",
1183                    video->flags.rom ? "yes" : "no");
1184         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1185                    video->flags.post ? "yes" : "no");
1186
1187       end:
1188         return 0;
1189 }
1190
1191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1192 {
1193         return single_open(file, acpi_video_bus_info_seq_show,
1194                            PDE(inode)->data);
1195 }
1196
1197 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1198 {
1199         struct acpi_video_bus *video = seq->private;
1200
1201
1202         if (!video)
1203                 goto end;
1204
1205         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1206         seq_printf(seq, "<TODO>\n");
1207
1208       end:
1209         return 0;
1210 }
1211
1212 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1213 {
1214         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1215 }
1216
1217 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1218 {
1219         struct acpi_video_bus *video = seq->private;
1220         unsigned long options;
1221         int status;
1222
1223
1224         if (!video)
1225                 goto end;
1226
1227         status = acpi_video_bus_POST_options(video, &options);
1228         if (ACPI_SUCCESS(status)) {
1229                 if (!(options & 1)) {
1230                         printk(KERN_WARNING PREFIX
1231                                "The motherboard VGA device is not listed as a possible POST device.\n");
1232                         printk(KERN_WARNING PREFIX
1233                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1234                 }
1235                 printk("%lx\n", options);
1236                 seq_printf(seq, "can POST: <integrated video>");
1237                 if (options & 2)
1238                         seq_printf(seq, " <PCI video>");
1239                 if (options & 4)
1240                         seq_printf(seq, " <AGP video>");
1241                 seq_putc(seq, '\n');
1242         } else
1243                 seq_printf(seq, "<not supported>\n");
1244       end:
1245         return 0;
1246 }
1247
1248 static int
1249 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1250 {
1251         return single_open(file, acpi_video_bus_POST_info_seq_show,
1252                            PDE(inode)->data);
1253 }
1254
1255 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1256 {
1257         struct acpi_video_bus *video = seq->private;
1258         int status;
1259         unsigned long id;
1260
1261
1262         if (!video)
1263                 goto end;
1264
1265         status = acpi_video_bus_get_POST(video, &id);
1266         if (!ACPI_SUCCESS(status)) {
1267                 seq_printf(seq, "<not supported>\n");
1268                 goto end;
1269         }
1270         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1271
1272       end:
1273         return 0;
1274 }
1275
1276 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1277 {
1278         struct acpi_video_bus *video = seq->private;
1279
1280
1281         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1282
1283         return 0;
1284 }
1285
1286 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1287 {
1288         return single_open(file, acpi_video_bus_POST_seq_show,
1289                            PDE(inode)->data);
1290 }
1291
1292 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1293 {
1294         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1295 }
1296
1297 static ssize_t
1298 acpi_video_bus_write_POST(struct file *file,
1299                           const char __user * buffer,
1300                           size_t count, loff_t * data)
1301 {
1302         int status;
1303         struct seq_file *m = file->private_data;
1304         struct acpi_video_bus *video = m->private;
1305         char str[12] = { 0 };
1306         unsigned long opt, options;
1307
1308
1309         if (!video || count + 1 > sizeof str)
1310                 return -EINVAL;
1311
1312         status = acpi_video_bus_POST_options(video, &options);
1313         if (!ACPI_SUCCESS(status))
1314                 return -EINVAL;
1315
1316         if (copy_from_user(str, buffer, count))
1317                 return -EFAULT;
1318
1319         str[count] = 0;
1320         opt = strtoul(str, NULL, 0);
1321         if (opt > 3)
1322                 return -EFAULT;
1323
1324         /* just in case an OEM 'forgot' the motherboard... */
1325         options |= 1;
1326
1327         if (options & (1ul << opt)) {
1328                 status = acpi_video_bus_set_POST(video, opt);
1329                 if (!ACPI_SUCCESS(status))
1330                         return -EFAULT;
1331
1332         }
1333
1334         return count;
1335 }
1336
1337 static ssize_t
1338 acpi_video_bus_write_DOS(struct file *file,
1339                          const char __user * buffer,
1340                          size_t count, loff_t * data)
1341 {
1342         int status;
1343         struct seq_file *m = file->private_data;
1344         struct acpi_video_bus *video = m->private;
1345         char str[12] = { 0 };
1346         unsigned long opt;
1347
1348
1349         if (!video || count + 1 > sizeof str)
1350                 return -EINVAL;
1351
1352         if (copy_from_user(str, buffer, count))
1353                 return -EFAULT;
1354
1355         str[count] = 0;
1356         opt = strtoul(str, NULL, 0);
1357         if (opt > 7)
1358                 return -EFAULT;
1359
1360         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1361
1362         if (!ACPI_SUCCESS(status))
1363                 return -EFAULT;
1364
1365         return count;
1366 }
1367
1368 static int acpi_video_bus_add_fs(struct acpi_device *device)
1369 {
1370         struct acpi_video_bus *video = acpi_driver_data(device);
1371         struct proc_dir_entry *device_dir;
1372         struct proc_dir_entry *entry;
1373
1374         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1375         if (!device_dir)
1376                 return -ENOMEM;
1377
1378         device_dir->owner = THIS_MODULE;
1379
1380         /* 'info' [R] */
1381         entry = proc_create_data("info", S_IRUGO, device_dir,
1382                                  &acpi_video_bus_info_fops,
1383                                  acpi_driver_data(device));
1384         if (!entry)
1385                 goto err_remove_dir;
1386
1387         /* 'ROM' [R] */
1388         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1389                                  &acpi_video_bus_ROM_fops,
1390                                  acpi_driver_data(device));
1391         if (!entry)
1392                 goto err_remove_info;
1393
1394         /* 'POST_info' [R] */
1395         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1396                                  &acpi_video_bus_POST_info_fops,
1397                                  acpi_driver_data(device));
1398         if (!entry)
1399                 goto err_remove_rom;
1400
1401         /* 'POST' [R/W] */
1402         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1403         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1404                                  device_dir,
1405                                  &acpi_video_bus_POST_fops,
1406                                  acpi_driver_data(device));
1407         if (!entry)
1408                 goto err_remove_post_info;
1409
1410         /* 'DOS' [R/W] */
1411         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1412         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1413                                  device_dir,
1414                                  &acpi_video_bus_DOS_fops,
1415                                  acpi_driver_data(device));
1416         if (!entry)
1417                 goto err_remove_post;
1418
1419         video->dir = acpi_device_dir(device) = device_dir;
1420         return 0;
1421
1422  err_remove_post:
1423         remove_proc_entry("POST", device_dir);
1424  err_remove_post_info:
1425         remove_proc_entry("POST_info", device_dir);
1426  err_remove_rom:
1427         remove_proc_entry("ROM", device_dir);
1428  err_remove_info:
1429         remove_proc_entry("info", device_dir);
1430  err_remove_dir:
1431         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1432         return -ENOMEM;
1433 }
1434
1435 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1436 {
1437         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1438
1439         if (device_dir) {
1440                 remove_proc_entry("info", device_dir);
1441                 remove_proc_entry("ROM", device_dir);
1442                 remove_proc_entry("POST_info", device_dir);
1443                 remove_proc_entry("POST", device_dir);
1444                 remove_proc_entry("DOS", device_dir);
1445                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1446                 acpi_device_dir(device) = NULL;
1447         }
1448
1449         return 0;
1450 }
1451
1452 /* --------------------------------------------------------------------------
1453                                  Driver Interface
1454    -------------------------------------------------------------------------- */
1455
1456 /* device interface */
1457 static struct acpi_video_device_attrib*
1458 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1459 {
1460         struct acpi_video_enumerated_device *ids;
1461         int i;
1462
1463         for (i = 0; i < video->attached_count; i++) {
1464                 ids = &video->attached_array[i];
1465                 if ((ids->value.int_val & 0xffff) == device_id)
1466                         return &ids->value.attrib;
1467         }
1468
1469         return NULL;
1470 }
1471
1472 static int
1473 acpi_video_bus_get_one_device(struct acpi_device *device,
1474                               struct acpi_video_bus *video)
1475 {
1476         unsigned long device_id;
1477         int status;
1478         struct acpi_video_device *data;
1479         struct acpi_video_device_attrib* attribute;
1480
1481         if (!device || !video)
1482                 return -EINVAL;
1483
1484         status =
1485             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1486         if (ACPI_SUCCESS(status)) {
1487
1488                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1489                 if (!data)
1490                         return -ENOMEM;
1491
1492                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1493                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1494                 acpi_driver_data(device) = data;
1495
1496                 data->device_id = device_id;
1497                 data->video = video;
1498                 data->dev = device;
1499
1500                 attribute = acpi_video_get_device_attr(video, device_id);
1501
1502                 if((attribute != NULL) && attribute->device_id_scheme) {
1503                         switch (attribute->display_type) {
1504                         case ACPI_VIDEO_DISPLAY_CRT:
1505                                 data->flags.crt = 1;
1506                                 break;
1507                         case ACPI_VIDEO_DISPLAY_TV:
1508                                 data->flags.tvout = 1;
1509                                 break;
1510                         case ACPI_VIDEO_DISPLAY_DVI:
1511                                 data->flags.dvi = 1;
1512                                 break;
1513                         case ACPI_VIDEO_DISPLAY_LCD:
1514                                 data->flags.lcd = 1;
1515                                 break;
1516                         default:
1517                                 data->flags.unknown = 1;
1518                                 break;
1519                         }
1520                         if(attribute->bios_can_detect)
1521                                 data->flags.bios = 1;
1522                 } else
1523                         data->flags.unknown = 1;
1524
1525                 acpi_video_device_bind(video, data);
1526                 acpi_video_device_find_cap(data);
1527
1528                 status = acpi_install_notify_handler(device->handle,
1529                                                      ACPI_DEVICE_NOTIFY,
1530                                                      acpi_video_device_notify,
1531                                                      data);
1532                 if (ACPI_FAILURE(status)) {
1533                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1534                                           "Error installing notify handler\n"));
1535                         if(data->brightness)
1536                                 kfree(data->brightness->levels);
1537                         kfree(data->brightness);
1538                         kfree(data);
1539                         return -ENODEV;
1540                 }
1541
1542                 mutex_lock(&video->device_list_lock);
1543                 list_add_tail(&data->entry, &video->video_device_list);
1544                 mutex_unlock(&video->device_list_lock);
1545
1546                 acpi_video_device_add_fs(device);
1547
1548                 return 0;
1549         }
1550
1551         return -ENOENT;
1552 }
1553
1554 /*
1555  *  Arg:
1556  *      video   : video bus device 
1557  *
1558  *  Return:
1559  *      none
1560  *  
1561  *  Enumerate the video device list of the video bus, 
1562  *  bind the ids with the corresponding video devices
1563  *  under the video bus.
1564  */
1565
1566 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1567 {
1568         struct acpi_video_device *dev;
1569
1570         mutex_lock(&video->device_list_lock);
1571
1572         list_for_each_entry(dev, &video->video_device_list, entry)
1573                 acpi_video_device_bind(video, dev);
1574
1575         mutex_unlock(&video->device_list_lock);
1576 }
1577
1578 /*
1579  *  Arg:
1580  *      video   : video bus device 
1581  *      device  : video output device under the video 
1582  *              bus
1583  *
1584  *  Return:
1585  *      none
1586  *  
1587  *  Bind the ids with the corresponding video devices
1588  *  under the video bus.
1589  */
1590
1591 static void
1592 acpi_video_device_bind(struct acpi_video_bus *video,
1593                        struct acpi_video_device *device)
1594 {
1595         struct acpi_video_enumerated_device *ids;
1596         int i;
1597
1598         for (i = 0; i < video->attached_count; i++) {
1599                 ids = &video->attached_array[i];
1600                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1601                         ids->bind_info = device;
1602                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1603                 }
1604         }
1605 }
1606
1607 /*
1608  *  Arg:
1609  *      video   : video bus device 
1610  *
1611  *  Return:
1612  *      < 0     : error
1613  *  
1614  *  Call _DOD to enumerate all devices attached to display adapter
1615  *
1616  */
1617
1618 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1619 {
1620         int status;
1621         int count;
1622         int i;
1623         struct acpi_video_enumerated_device *active_list;
1624         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1625         union acpi_object *dod = NULL;
1626         union acpi_object *obj;
1627
1628         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1629         if (!ACPI_SUCCESS(status)) {
1630                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1631                 return status;
1632         }
1633
1634         dod = buffer.pointer;
1635         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1636                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1637                 status = -EFAULT;
1638                 goto out;
1639         }
1640
1641         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1642                           dod->package.count));
1643
1644         active_list = kcalloc(1 + dod->package.count,
1645                               sizeof(struct acpi_video_enumerated_device),
1646                               GFP_KERNEL);
1647         if (!active_list) {
1648                 status = -ENOMEM;
1649                 goto out;
1650         }
1651
1652         count = 0;
1653         for (i = 0; i < dod->package.count; i++) {
1654                 obj = &dod->package.elements[i];
1655
1656                 if (obj->type != ACPI_TYPE_INTEGER) {
1657                         printk(KERN_ERR PREFIX
1658                                 "Invalid _DOD data in element %d\n", i);
1659                         continue;
1660                 }
1661
1662                 active_list[count].value.int_val = obj->integer.value;
1663                 active_list[count].bind_info = NULL;
1664                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1665                                   (int)obj->integer.value));
1666                 count++;
1667         }
1668
1669         kfree(video->attached_array);
1670
1671         video->attached_array = active_list;
1672         video->attached_count = count;
1673
1674  out:
1675         kfree(buffer.pointer);
1676         return status;
1677 }
1678
1679 static int
1680 acpi_video_get_next_level(struct acpi_video_device *device,
1681                           u32 level_current, u32 event)
1682 {
1683         int min, max, min_above, max_below, i, l, delta = 255;
1684         max = max_below = 0;
1685         min = min_above = 255;
1686         /* Find closest level to level_current */
1687         for (i = 0; i < device->brightness->count; i++) {
1688                 l = device->brightness->levels[i];
1689                 if (abs(l - level_current) < abs(delta)) {
1690                         delta = l - level_current;
1691                         if (!delta)
1692                                 break;
1693                 }
1694         }
1695         /* Ajust level_current to closest available level */
1696         level_current += delta;
1697         for (i = 0; i < device->brightness->count; i++) {
1698                 l = device->brightness->levels[i];
1699                 if (l < min)
1700                         min = l;
1701                 if (l > max)
1702                         max = l;
1703                 if (l < min_above && l > level_current)
1704                         min_above = l;
1705                 if (l > max_below && l < level_current)
1706                         max_below = l;
1707         }
1708
1709         switch (event) {
1710         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1711                 return (level_current < max) ? min_above : min;
1712         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1713                 return (level_current < max) ? min_above : max;
1714         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1715                 return (level_current > min) ? max_below : min;
1716         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1717         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1718                 return 0;
1719         default:
1720                 return level_current;
1721         }
1722 }
1723
1724 static void
1725 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1726 {
1727         unsigned long level_current, level_next;
1728         if (!device->brightness)
1729                 return;
1730         acpi_video_device_lcd_get_level_current(device, &level_current);
1731         level_next = acpi_video_get_next_level(device, level_current, event);
1732         acpi_video_device_lcd_set_level(device, level_next);
1733 }
1734
1735 static int
1736 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1737                            struct acpi_device *device)
1738 {
1739         int status = 0;
1740         struct acpi_device *dev;
1741
1742         acpi_video_device_enumerate(video);
1743
1744         list_for_each_entry(dev, &device->children, node) {
1745
1746                 status = acpi_video_bus_get_one_device(dev, video);
1747                 if (ACPI_FAILURE(status)) {
1748                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1749                                         "Cant attach device"));
1750                         continue;
1751                 }
1752         }
1753         return status;
1754 }
1755
1756 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1757 {
1758         acpi_status status;
1759         struct acpi_video_bus *video;
1760
1761
1762         if (!device || !device->video)
1763                 return -ENOENT;
1764
1765         video = device->video;
1766
1767         acpi_video_device_remove_fs(device->dev);
1768
1769         status = acpi_remove_notify_handler(device->dev->handle,
1770                                             ACPI_DEVICE_NOTIFY,
1771                                             acpi_video_device_notify);
1772         backlight_device_unregister(device->backlight);
1773         if (device->cdev) {
1774                 sysfs_remove_link(&device->dev->dev.kobj,
1775                                   "thermal_cooling");
1776                 sysfs_remove_link(&device->cdev->device.kobj,
1777                                   "device");
1778                 thermal_cooling_device_unregister(device->cdev);
1779                 device->cdev = NULL;
1780         }
1781         video_output_unregister(device->output_dev);
1782
1783         return 0;
1784 }
1785
1786 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1787 {
1788         int status;
1789         struct acpi_video_device *dev, *next;
1790
1791         mutex_lock(&video->device_list_lock);
1792
1793         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1794
1795                 status = acpi_video_bus_put_one_device(dev);
1796                 if (ACPI_FAILURE(status))
1797                         printk(KERN_WARNING PREFIX
1798                                "hhuuhhuu bug in acpi video driver.\n");
1799
1800                 if (dev->brightness) {
1801                         kfree(dev->brightness->levels);
1802                         kfree(dev->brightness);
1803                 }
1804                 list_del(&dev->entry);
1805                 kfree(dev);
1806         }
1807
1808         mutex_unlock(&video->device_list_lock);
1809
1810         return 0;
1811 }
1812
1813 /* acpi_video interface */
1814
1815 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1816 {
1817         return acpi_video_bus_DOS(video, 0, 0);
1818 }
1819
1820 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1821 {
1822         return acpi_video_bus_DOS(video, 0, 1);
1823 }
1824
1825 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1826 {
1827         struct acpi_video_bus *video = data;
1828         struct acpi_device *device = NULL;
1829         struct input_dev *input;
1830         int keycode;
1831
1832         if (!video)
1833                 return;
1834
1835         device = video->device;
1836         input = video->input;
1837
1838         switch (event) {
1839         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1840                                          * most likely via hotkey. */
1841                 acpi_bus_generate_proc_event(device, event, 0);
1842                 keycode = KEY_SWITCHVIDEOMODE;
1843                 break;
1844
1845         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1846                                          * connector. */
1847                 acpi_video_device_enumerate(video);
1848                 acpi_video_device_rebind(video);
1849                 acpi_bus_generate_proc_event(device, event, 0);
1850                 keycode = KEY_SWITCHVIDEOMODE;
1851                 break;
1852
1853         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1854                 acpi_bus_generate_proc_event(device, event, 0);
1855                 keycode = KEY_SWITCHVIDEOMODE;
1856                 break;
1857         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1858                 acpi_bus_generate_proc_event(device, event, 0);
1859                 keycode = KEY_VIDEO_NEXT;
1860                 break;
1861         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1862                 acpi_bus_generate_proc_event(device, event, 0);
1863                 keycode = KEY_VIDEO_PREV;
1864                 break;
1865
1866         default:
1867                 keycode = KEY_UNKNOWN;
1868                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1869                                   "Unsupported event [0x%x]\n", event));
1870                 break;
1871         }
1872
1873         acpi_notifier_call_chain(device, event, 0);
1874         input_report_key(input, keycode, 1);
1875         input_sync(input);
1876         input_report_key(input, keycode, 0);
1877         input_sync(input);
1878
1879         return;
1880 }
1881
1882 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1883 {
1884         struct acpi_video_device *video_device = data;
1885         struct acpi_device *device = NULL;
1886         struct acpi_video_bus *bus;
1887         struct input_dev *input;
1888         int keycode;
1889
1890         if (!video_device)
1891                 return;
1892
1893         device = video_device->dev;
1894         bus = video_device->video;
1895         input = bus->input;
1896
1897         switch (event) {
1898         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
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_CYCLE;
1903                 break;
1904         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
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_BRIGHTNESSUP;
1909                 break;
1910         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1911                 if (brightness_switch_enabled)
1912                         acpi_video_switch_brightness(video_device, event);
1913                 acpi_bus_generate_proc_event(device, event, 0);
1914                 keycode = KEY_BRIGHTNESSDOWN;
1915                 break;
1916         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1917                 if (brightness_switch_enabled)
1918                         acpi_video_switch_brightness(video_device, event);
1919                 acpi_bus_generate_proc_event(device, event, 0);
1920                 keycode = KEY_BRIGHTNESS_ZERO;
1921                 break;
1922         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1923                 if (brightness_switch_enabled)
1924                         acpi_video_switch_brightness(video_device, event);
1925                 acpi_bus_generate_proc_event(device, event, 0);
1926                 keycode = KEY_DISPLAY_OFF;
1927                 break;
1928         default:
1929                 keycode = KEY_UNKNOWN;
1930                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1931                                   "Unsupported event [0x%x]\n", event));
1932                 break;
1933         }
1934
1935         acpi_notifier_call_chain(device, event, 0);
1936         input_report_key(input, keycode, 1);
1937         input_sync(input);
1938         input_report_key(input, keycode, 0);
1939         input_sync(input);
1940
1941         return;
1942 }
1943
1944 static int instance;
1945 static int acpi_video_resume(struct acpi_device *device)
1946 {
1947         struct acpi_video_bus *video;
1948         struct acpi_video_device *video_device;
1949         int i;
1950
1951         if (!device || !acpi_driver_data(device))
1952                 return -EINVAL;
1953
1954         video = acpi_driver_data(device);
1955
1956         for (i = 0; i < video->attached_count; i++) {
1957                 video_device = video->attached_array[i].bind_info;
1958                 if (video_device && video_device->backlight)
1959                         acpi_video_set_brightness(video_device->backlight);
1960         }
1961         return AE_OK;
1962 }
1963
1964 static int acpi_video_bus_add(struct acpi_device *device)
1965 {
1966         acpi_status status;
1967         struct acpi_video_bus *video;
1968         struct input_dev *input;
1969         int error;
1970
1971         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1972         if (!video)
1973                 return -ENOMEM;
1974
1975         /* a hack to fix the duplicate name "VID" problem on T61 */
1976         if (!strcmp(device->pnp.bus_id, "VID")) {
1977                 if (instance)
1978                         device->pnp.bus_id[3] = '0' + instance;
1979                 instance ++;
1980         }
1981
1982         video->device = device;
1983         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1984         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1985         acpi_driver_data(device) = video;
1986
1987         acpi_video_bus_find_cap(video);
1988         error = acpi_video_bus_check(video);
1989         if (error)
1990                 goto err_free_video;
1991
1992         error = acpi_video_bus_add_fs(device);
1993         if (error)
1994                 goto err_free_video;
1995
1996         mutex_init(&video->device_list_lock);
1997         INIT_LIST_HEAD(&video->video_device_list);
1998
1999         acpi_video_bus_get_devices(video, device);
2000         acpi_video_bus_start_devices(video);
2001
2002         status = acpi_install_notify_handler(device->handle,
2003                                              ACPI_DEVICE_NOTIFY,
2004                                              acpi_video_bus_notify, video);
2005         if (ACPI_FAILURE(status)) {
2006                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
2007                                   "Error installing notify handler\n"));
2008                 error = -ENODEV;
2009                 goto err_stop_video;
2010         }
2011
2012         video->input = input = input_allocate_device();
2013         if (!input) {
2014                 error = -ENOMEM;
2015                 goto err_uninstall_notify;
2016         }
2017
2018         snprintf(video->phys, sizeof(video->phys),
2019                 "%s/video/input0", acpi_device_hid(video->device));
2020
2021         input->name = acpi_device_name(video->device);
2022         input->phys = video->phys;
2023         input->id.bustype = BUS_HOST;
2024         input->id.product = 0x06;
2025         input->dev.parent = &device->dev;
2026         input->evbit[0] = BIT(EV_KEY);
2027         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2028         set_bit(KEY_VIDEO_NEXT, input->keybit);
2029         set_bit(KEY_VIDEO_PREV, input->keybit);
2030         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2031         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2032         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2033         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2034         set_bit(KEY_DISPLAY_OFF, input->keybit);
2035         set_bit(KEY_UNKNOWN, input->keybit);
2036
2037         error = input_register_device(input);
2038         if (error)
2039                 goto err_free_input_dev;
2040
2041         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2042                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2043                video->flags.multihead ? "yes" : "no",
2044                video->flags.rom ? "yes" : "no",
2045                video->flags.post ? "yes" : "no");
2046
2047         return 0;
2048
2049  err_free_input_dev:
2050         input_free_device(input);
2051  err_uninstall_notify:
2052         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2053                                    acpi_video_bus_notify);
2054  err_stop_video:
2055         acpi_video_bus_stop_devices(video);
2056         acpi_video_bus_put_devices(video);
2057         kfree(video->attached_array);
2058         acpi_video_bus_remove_fs(device);
2059  err_free_video:
2060         kfree(video);
2061         acpi_driver_data(device) = NULL;
2062
2063         return error;
2064 }
2065
2066 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2067 {
2068         acpi_status status = 0;
2069         struct acpi_video_bus *video = NULL;
2070
2071
2072         if (!device || !acpi_driver_data(device))
2073                 return -EINVAL;
2074
2075         video = acpi_driver_data(device);
2076
2077         acpi_video_bus_stop_devices(video);
2078
2079         status = acpi_remove_notify_handler(video->device->handle,
2080                                             ACPI_DEVICE_NOTIFY,
2081                                             acpi_video_bus_notify);
2082
2083         acpi_video_bus_put_devices(video);
2084         acpi_video_bus_remove_fs(device);
2085
2086         input_unregister_device(video->input);
2087         kfree(video->attached_array);
2088         kfree(video);
2089
2090         return 0;
2091 }
2092
2093 static int __init acpi_video_init(void)
2094 {
2095         int result = 0;
2096
2097
2098         /*
2099            acpi_dbg_level = 0xFFFFFFFF;
2100            acpi_dbg_layer = 0x08000000;
2101          */
2102
2103         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2104         if (!acpi_video_dir)
2105                 return -ENODEV;
2106         acpi_video_dir->owner = THIS_MODULE;
2107
2108         result = acpi_bus_register_driver(&acpi_video_bus);
2109         if (result < 0) {
2110                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2111                 return -ENODEV;
2112         }
2113
2114         return 0;
2115 }
2116
2117 static void __exit acpi_video_exit(void)
2118 {
2119
2120         acpi_bus_unregister_driver(&acpi_video_bus);
2121
2122         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2123
2124         return;
2125 }
2126
2127 module_init(acpi_video_init);
2128 module_exit(acpi_video_exit);