tun: Limit amount of queued packets per device
[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 <linux/sort.h>
40 #include <asm/uaccess.h>
41
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44
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 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 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 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 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 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 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 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 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         int state;
486
487
488         arg0.integer.value = level;
489
490         if (device->cap._BCM)
491                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
492                                               &args, NULL);
493         device->brightness->curr = level;
494         for (state = 2; state < device->brightness->count; state++)
495                 if (level == device->brightness->levels[state])
496                         device->backlight->props.brightness = state - 2;
497
498         return status;
499 }
500
501 static int
502 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
503                                         unsigned long long *level)
504 {
505         if (device->cap._BQC)
506                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
507                                              level);
508         *level = device->brightness->curr;
509         return AE_OK;
510 }
511
512 static int
513 acpi_video_device_EDID(struct acpi_video_device *device,
514                        union acpi_object **edid, ssize_t length)
515 {
516         int status;
517         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
518         union acpi_object *obj;
519         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
520         struct acpi_object_list args = { 1, &arg0 };
521
522
523         *edid = NULL;
524
525         if (!device)
526                 return -ENODEV;
527         if (length == 128)
528                 arg0.integer.value = 1;
529         else if (length == 256)
530                 arg0.integer.value = 2;
531         else
532                 return -EINVAL;
533
534         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
535         if (ACPI_FAILURE(status))
536                 return -ENODEV;
537
538         obj = buffer.pointer;
539
540         if (obj && obj->type == ACPI_TYPE_BUFFER)
541                 *edid = obj;
542         else {
543                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
544                 status = -EFAULT;
545                 kfree(obj);
546         }
547
548         return status;
549 }
550
551 /* bus */
552
553 static int
554 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
555 {
556         int status;
557         unsigned long long tmp;
558         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
559         struct acpi_object_list args = { 1, &arg0 };
560
561
562         arg0.integer.value = option;
563
564         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
565         if (ACPI_SUCCESS(status))
566                 status = tmp ? (-EINVAL) : (AE_OK);
567
568         return status;
569 }
570
571 static int
572 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
573 {
574         int status;
575
576         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
577
578         return status;
579 }
580
581 static int
582 acpi_video_bus_POST_options(struct acpi_video_bus *video,
583                             unsigned long long *options)
584 {
585         int status;
586
587         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
588         *options &= 3;
589
590         return status;
591 }
592
593 /*
594  *  Arg:
595  *      video           : video bus device pointer
596  *      bios_flag       : 
597  *              0.      The system BIOS should NOT automatically switch(toggle)
598  *                      the active display output.
599  *              1.      The system BIOS should automatically switch (toggle) the
600  *                      active display output. No switch event.
601  *              2.      The _DGS value should be locked.
602  *              3.      The system BIOS should not automatically switch (toggle) the
603  *                      active display output, but instead generate the display switch
604  *                      event notify code.
605  *      lcd_flag        :
606  *              0.      The system BIOS should automatically control the brightness level
607  *                      of the LCD when the power changes from AC to DC
608  *              1.      The system BIOS should NOT automatically control the brightness 
609  *                      level of the LCD when the power changes from AC to DC.
610  * Return Value:
611  *              -1      wrong arg.
612  */
613
614 static int
615 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
616 {
617         acpi_integer status = 0;
618         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
619         struct acpi_object_list args = { 1, &arg0 };
620
621
622         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
623                 status = -1;
624                 goto Failed;
625         }
626         arg0.integer.value = (lcd_flag << 2) | bios_flag;
627         video->dos_setting = arg0.integer.value;
628         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
629
630       Failed:
631         return status;
632 }
633
634 /*
635  * Simple comparison function used to sort backlight levels.
636  */
637
638 static int
639 acpi_video_cmp_level(const void *a, const void *b)
640 {
641         return *(int *)a - *(int *)b;
642 }
643
644 /*
645  *  Arg:        
646  *      device  : video output device (LCD, CRT, ..)
647  *
648  *  Return Value:
649  *      Maximum brightness level
650  *
651  *  Allocate and initialize device->brightness.
652  */
653
654 static int
655 acpi_video_init_brightness(struct acpi_video_device *device)
656 {
657         union acpi_object *obj = NULL;
658         int i, max_level = 0, count = 0;
659         union acpi_object *o;
660         struct acpi_video_device_brightness *br = NULL;
661
662         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
663                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
664                                                 "LCD brightness level\n"));
665                 goto out;
666         }
667
668         if (obj->package.count < 2)
669                 goto out;
670
671         br = kzalloc(sizeof(*br), GFP_KERNEL);
672         if (!br) {
673                 printk(KERN_ERR "can't allocate memory\n");
674                 goto out;
675         }
676
677         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
678                                 GFP_KERNEL);
679         if (!br->levels)
680                 goto out_free;
681
682         for (i = 0; i < obj->package.count; i++) {
683                 o = (union acpi_object *)&obj->package.elements[i];
684                 if (o->type != ACPI_TYPE_INTEGER) {
685                         printk(KERN_ERR PREFIX "Invalid data\n");
686                         continue;
687                 }
688                 br->levels[count] = (u32) o->integer.value;
689
690                 if (br->levels[count] > max_level)
691                         max_level = br->levels[count];
692                 count++;
693         }
694
695         /* don't sort the first two brightness levels */
696         sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
697                 acpi_video_cmp_level, NULL);
698
699         if (count < 2)
700                 goto out_free_levels;
701
702         br->count = count;
703         device->brightness = br;
704         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
705         kfree(obj);
706         return max_level;
707
708 out_free_levels:
709         kfree(br->levels);
710 out_free:
711         kfree(br);
712 out:
713         device->brightness = NULL;
714         kfree(obj);
715         return 0;
716 }
717
718 /*
719  *  Arg:
720  *      device  : video output device (LCD, CRT, ..)
721  *
722  *  Return Value:
723  *      None
724  *
725  *  Find out all required AML methods defined under the output
726  *  device.
727  */
728
729 static void acpi_video_device_find_cap(struct acpi_video_device *device)
730 {
731         acpi_handle h_dummy1;
732         u32 max_level = 0;
733
734
735         memset(&device->cap, 0, sizeof(device->cap));
736
737         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
738                 device->cap._ADR = 1;
739         }
740         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
741                 device->cap._BCL = 1;
742         }
743         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
744                 device->cap._BCM = 1;
745         }
746         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
747                 device->cap._BQC = 1;
748         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
749                 device->cap._DDC = 1;
750         }
751         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
752                 device->cap._DCS = 1;
753         }
754         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
755                 device->cap._DGS = 1;
756         }
757         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
758                 device->cap._DSS = 1;
759         }
760
761         if (acpi_video_backlight_support())
762                 max_level = acpi_video_init_brightness(device);
763
764         if (device->cap._BCL && device->cap._BCM && max_level > 0) {
765                 int result;
766                 static int count = 0;
767                 char *name;
768                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
769                 if (!name)
770                         return;
771
772                 sprintf(name, "acpi_video%d", count++);
773                 device->backlight = backlight_device_register(name,
774                         NULL, device, &acpi_backlight_ops);
775                 device->backlight->props.max_brightness = device->brightness->count-3;
776                 /*
777                  * If there exists the _BQC object, the _BQC object will be
778                  * called to get the current backlight brightness. Otherwise
779                  * the brightness will be set to the maximum.
780                  */
781                 if (device->cap._BQC)
782                         device->backlight->props.brightness =
783                                 acpi_video_get_brightness(device->backlight);
784                 else
785                         device->backlight->props.brightness =
786                                 device->backlight->props.max_brightness;
787                 backlight_update_status(device->backlight);
788                 kfree(name);
789
790                 device->cdev = thermal_cooling_device_register("LCD",
791                                         device->dev, &video_cooling_ops);
792                 if (IS_ERR(device->cdev))
793                         return;
794
795                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
796                          device->cdev->id);
797                 result = sysfs_create_link(&device->dev->dev.kobj,
798                                 &device->cdev->device.kobj,
799                                 "thermal_cooling");
800                 if (result)
801                         printk(KERN_ERR PREFIX "Create sysfs link\n");
802                 result = sysfs_create_link(&device->cdev->device.kobj,
803                                 &device->dev->dev.kobj, "device");
804                 if (result)
805                         printk(KERN_ERR PREFIX "Create sysfs link\n");
806
807         }
808
809         if (acpi_video_display_switch_support()) {
810
811                 if (device->cap._DCS && device->cap._DSS) {
812                         static int count;
813                         char *name;
814                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
815                         if (!name)
816                                 return;
817                         sprintf(name, "acpi_video%d", count++);
818                         device->output_dev = video_output_register(name,
819                                         NULL, device, &acpi_output_properties);
820                         kfree(name);
821                 }
822         }
823 }
824
825 /*
826  *  Arg:        
827  *      device  : video output device (VGA)
828  *
829  *  Return Value:
830  *      None
831  *
832  *  Find out all required AML methods defined under the video bus device.
833  */
834
835 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
836 {
837         acpi_handle h_dummy1;
838
839         memset(&video->cap, 0, sizeof(video->cap));
840         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
841                 video->cap._DOS = 1;
842         }
843         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
844                 video->cap._DOD = 1;
845         }
846         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
847                 video->cap._ROM = 1;
848         }
849         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
850                 video->cap._GPD = 1;
851         }
852         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
853                 video->cap._SPD = 1;
854         }
855         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
856                 video->cap._VPO = 1;
857         }
858 }
859
860 /*
861  * Check whether the video bus device has required AML method to
862  * support the desired features
863  */
864
865 static int acpi_video_bus_check(struct acpi_video_bus *video)
866 {
867         acpi_status status = -ENOENT;
868         struct device *dev;
869
870         if (!video)
871                 return -EINVAL;
872
873         dev = acpi_get_physical_pci_device(video->device->handle);
874         if (!dev)
875                 return -ENODEV;
876         put_device(dev);
877
878         /* Since there is no HID, CID and so on for VGA driver, we have
879          * to check well known required nodes.
880          */
881
882         /* Does this device support video switching? */
883         if (video->cap._DOS) {
884                 video->flags.multihead = 1;
885                 status = 0;
886         }
887
888         /* Does this device support retrieving a video ROM? */
889         if (video->cap._ROM) {
890                 video->flags.rom = 1;
891                 status = 0;
892         }
893
894         /* Does this device support configuring which video device to POST? */
895         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
896                 video->flags.post = 1;
897                 status = 0;
898         }
899
900         return status;
901 }
902
903 /* --------------------------------------------------------------------------
904                               FS Interface (/proc)
905    -------------------------------------------------------------------------- */
906
907 static struct proc_dir_entry *acpi_video_dir;
908
909 /* video devices */
910
911 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
912 {
913         struct acpi_video_device *dev = seq->private;
914
915
916         if (!dev)
917                 goto end;
918
919         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
920         seq_printf(seq, "type:         ");
921         if (dev->flags.crt)
922                 seq_printf(seq, "CRT\n");
923         else if (dev->flags.lcd)
924                 seq_printf(seq, "LCD\n");
925         else if (dev->flags.tvout)
926                 seq_printf(seq, "TVOUT\n");
927         else if (dev->flags.dvi)
928                 seq_printf(seq, "DVI\n");
929         else
930                 seq_printf(seq, "UNKNOWN\n");
931
932         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
933
934       end:
935         return 0;
936 }
937
938 static int
939 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
940 {
941         return single_open(file, acpi_video_device_info_seq_show,
942                            PDE(inode)->data);
943 }
944
945 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
946 {
947         int status;
948         struct acpi_video_device *dev = seq->private;
949         unsigned long long state;
950
951
952         if (!dev)
953                 goto end;
954
955         status = acpi_video_device_get_state(dev, &state);
956         seq_printf(seq, "state:     ");
957         if (ACPI_SUCCESS(status))
958                 seq_printf(seq, "0x%02llx\n", state);
959         else
960                 seq_printf(seq, "<not supported>\n");
961
962         status = acpi_video_device_query(dev, &state);
963         seq_printf(seq, "query:     ");
964         if (ACPI_SUCCESS(status))
965                 seq_printf(seq, "0x%02llx\n", state);
966         else
967                 seq_printf(seq, "<not supported>\n");
968
969       end:
970         return 0;
971 }
972
973 static int
974 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
975 {
976         return single_open(file, acpi_video_device_state_seq_show,
977                            PDE(inode)->data);
978 }
979
980 static ssize_t
981 acpi_video_device_write_state(struct file *file,
982                               const char __user * buffer,
983                               size_t count, loff_t * data)
984 {
985         int status;
986         struct seq_file *m = file->private_data;
987         struct acpi_video_device *dev = m->private;
988         char str[12] = { 0 };
989         u32 state = 0;
990
991
992         if (!dev || count + 1 > sizeof str)
993                 return -EINVAL;
994
995         if (copy_from_user(str, buffer, count))
996                 return -EFAULT;
997
998         str[count] = 0;
999         state = simple_strtoul(str, NULL, 0);
1000         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1001
1002         status = acpi_video_device_set_state(dev, state);
1003
1004         if (status)
1005                 return -EFAULT;
1006
1007         return count;
1008 }
1009
1010 static int
1011 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1012 {
1013         struct acpi_video_device *dev = seq->private;
1014         int i;
1015
1016
1017         if (!dev || !dev->brightness) {
1018                 seq_printf(seq, "<not supported>\n");
1019                 return 0;
1020         }
1021
1022         seq_printf(seq, "levels: ");
1023         for (i = 0; i < dev->brightness->count; i++)
1024                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1025         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1026
1027         return 0;
1028 }
1029
1030 static int
1031 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1032 {
1033         return single_open(file, acpi_video_device_brightness_seq_show,
1034                            PDE(inode)->data);
1035 }
1036
1037 static ssize_t
1038 acpi_video_device_write_brightness(struct file *file,
1039                                    const char __user * buffer,
1040                                    size_t count, loff_t * data)
1041 {
1042         struct seq_file *m = file->private_data;
1043         struct acpi_video_device *dev = m->private;
1044         char str[5] = { 0 };
1045         unsigned int level = 0;
1046         int i;
1047
1048
1049         if (!dev || !dev->brightness || count + 1 > sizeof str)
1050                 return -EINVAL;
1051
1052         if (copy_from_user(str, buffer, count))
1053                 return -EFAULT;
1054
1055         str[count] = 0;
1056         level = simple_strtoul(str, NULL, 0);
1057
1058         if (level > 100)
1059                 return -EFAULT;
1060
1061         /* validate through the list of available levels */
1062         for (i = 0; i < dev->brightness->count; i++)
1063                 if (level == dev->brightness->levels[i]) {
1064                         if (ACPI_SUCCESS
1065                             (acpi_video_device_lcd_set_level(dev, level)))
1066                                 dev->brightness->curr = level;
1067                         break;
1068                 }
1069
1070         return count;
1071 }
1072
1073 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1074 {
1075         struct acpi_video_device *dev = seq->private;
1076         int status;
1077         int i;
1078         union acpi_object *edid = NULL;
1079
1080
1081         if (!dev)
1082                 goto out;
1083
1084         status = acpi_video_device_EDID(dev, &edid, 128);
1085         if (ACPI_FAILURE(status)) {
1086                 status = acpi_video_device_EDID(dev, &edid, 256);
1087         }
1088
1089         if (ACPI_FAILURE(status)) {
1090                 goto out;
1091         }
1092
1093         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1094                 for (i = 0; i < edid->buffer.length; i++)
1095                         seq_putc(seq, edid->buffer.pointer[i]);
1096         }
1097
1098       out:
1099         if (!edid)
1100                 seq_printf(seq, "<not supported>\n");
1101         else
1102                 kfree(edid);
1103
1104         return 0;
1105 }
1106
1107 static int
1108 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1109 {
1110         return single_open(file, acpi_video_device_EDID_seq_show,
1111                            PDE(inode)->data);
1112 }
1113
1114 static int acpi_video_device_add_fs(struct acpi_device *device)
1115 {
1116         struct proc_dir_entry *entry, *device_dir;
1117         struct acpi_video_device *vid_dev;
1118
1119         vid_dev = acpi_driver_data(device);
1120         if (!vid_dev)
1121                 return -ENODEV;
1122
1123         device_dir = proc_mkdir(acpi_device_bid(device),
1124                                 vid_dev->video->dir);
1125         if (!device_dir)
1126                 return -ENOMEM;
1127
1128         device_dir->owner = THIS_MODULE;
1129
1130         /* 'info' [R] */
1131         entry = proc_create_data("info", S_IRUGO, device_dir,
1132                         &acpi_video_device_info_fops, acpi_driver_data(device));
1133         if (!entry)
1134                 goto err_remove_dir;
1135
1136         /* 'state' [R/W] */
1137         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1138         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1139                                  device_dir,
1140                                  &acpi_video_device_state_fops,
1141                                  acpi_driver_data(device));
1142         if (!entry)
1143                 goto err_remove_info;
1144
1145         /* 'brightness' [R/W] */
1146         acpi_video_device_brightness_fops.write =
1147                 acpi_video_device_write_brightness;
1148         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1149                                  device_dir,
1150                                  &acpi_video_device_brightness_fops,
1151                                  acpi_driver_data(device));
1152         if (!entry)
1153                 goto err_remove_state;
1154
1155         /* 'EDID' [R] */
1156         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1157                                  &acpi_video_device_EDID_fops,
1158                                  acpi_driver_data(device));
1159         if (!entry)
1160                 goto err_remove_brightness;
1161
1162         acpi_device_dir(device) = device_dir;
1163
1164         return 0;
1165
1166  err_remove_brightness:
1167         remove_proc_entry("brightness", device_dir);
1168  err_remove_state:
1169         remove_proc_entry("state", device_dir);
1170  err_remove_info:
1171         remove_proc_entry("info", device_dir);
1172  err_remove_dir:
1173         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1174         return -ENOMEM;
1175 }
1176
1177 static int acpi_video_device_remove_fs(struct acpi_device *device)
1178 {
1179         struct acpi_video_device *vid_dev;
1180         struct proc_dir_entry *device_dir;
1181
1182         vid_dev = acpi_driver_data(device);
1183         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1184                 return -ENODEV;
1185
1186         device_dir = acpi_device_dir(device);
1187         if (device_dir) {
1188                 remove_proc_entry("info", device_dir);
1189                 remove_proc_entry("state", device_dir);
1190                 remove_proc_entry("brightness", device_dir);
1191                 remove_proc_entry("EDID", device_dir);
1192                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1193                 acpi_device_dir(device) = NULL;
1194         }
1195
1196         return 0;
1197 }
1198
1199 /* video bus */
1200 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1201 {
1202         struct acpi_video_bus *video = seq->private;
1203
1204
1205         if (!video)
1206                 goto end;
1207
1208         seq_printf(seq, "Switching heads:              %s\n",
1209                    video->flags.multihead ? "yes" : "no");
1210         seq_printf(seq, "Video ROM:                    %s\n",
1211                    video->flags.rom ? "yes" : "no");
1212         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1213                    video->flags.post ? "yes" : "no");
1214
1215       end:
1216         return 0;
1217 }
1218
1219 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1220 {
1221         return single_open(file, acpi_video_bus_info_seq_show,
1222                            PDE(inode)->data);
1223 }
1224
1225 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1226 {
1227         struct acpi_video_bus *video = seq->private;
1228
1229
1230         if (!video)
1231                 goto end;
1232
1233         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1234         seq_printf(seq, "<TODO>\n");
1235
1236       end:
1237         return 0;
1238 }
1239
1240 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1241 {
1242         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1243 }
1244
1245 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1246 {
1247         struct acpi_video_bus *video = seq->private;
1248         unsigned long long options;
1249         int status;
1250
1251
1252         if (!video)
1253                 goto end;
1254
1255         status = acpi_video_bus_POST_options(video, &options);
1256         if (ACPI_SUCCESS(status)) {
1257                 if (!(options & 1)) {
1258                         printk(KERN_WARNING PREFIX
1259                                "The motherboard VGA device is not listed as a possible POST device.\n");
1260                         printk(KERN_WARNING PREFIX
1261                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1262                 }
1263                 printk("%llx\n", options);
1264                 seq_printf(seq, "can POST: <integrated video>");
1265                 if (options & 2)
1266                         seq_printf(seq, " <PCI video>");
1267                 if (options & 4)
1268                         seq_printf(seq, " <AGP video>");
1269                 seq_putc(seq, '\n');
1270         } else
1271                 seq_printf(seq, "<not supported>\n");
1272       end:
1273         return 0;
1274 }
1275
1276 static int
1277 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1278 {
1279         return single_open(file, acpi_video_bus_POST_info_seq_show,
1280                            PDE(inode)->data);
1281 }
1282
1283 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1284 {
1285         struct acpi_video_bus *video = seq->private;
1286         int status;
1287         unsigned long long id;
1288
1289
1290         if (!video)
1291                 goto end;
1292
1293         status = acpi_video_bus_get_POST(video, &id);
1294         if (!ACPI_SUCCESS(status)) {
1295                 seq_printf(seq, "<not supported>\n");
1296                 goto end;
1297         }
1298         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1299
1300       end:
1301         return 0;
1302 }
1303
1304 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1305 {
1306         struct acpi_video_bus *video = seq->private;
1307
1308
1309         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1310
1311         return 0;
1312 }
1313
1314 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1315 {
1316         return single_open(file, acpi_video_bus_POST_seq_show,
1317                            PDE(inode)->data);
1318 }
1319
1320 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1321 {
1322         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1323 }
1324
1325 static ssize_t
1326 acpi_video_bus_write_POST(struct file *file,
1327                           const char __user * buffer,
1328                           size_t count, loff_t * data)
1329 {
1330         int status;
1331         struct seq_file *m = file->private_data;
1332         struct acpi_video_bus *video = m->private;
1333         char str[12] = { 0 };
1334         unsigned long long opt, options;
1335
1336
1337         if (!video || count + 1 > sizeof str)
1338                 return -EINVAL;
1339
1340         status = acpi_video_bus_POST_options(video, &options);
1341         if (!ACPI_SUCCESS(status))
1342                 return -EINVAL;
1343
1344         if (copy_from_user(str, buffer, count))
1345                 return -EFAULT;
1346
1347         str[count] = 0;
1348         opt = strtoul(str, NULL, 0);
1349         if (opt > 3)
1350                 return -EFAULT;
1351
1352         /* just in case an OEM 'forgot' the motherboard... */
1353         options |= 1;
1354
1355         if (options & (1ul << opt)) {
1356                 status = acpi_video_bus_set_POST(video, opt);
1357                 if (!ACPI_SUCCESS(status))
1358                         return -EFAULT;
1359
1360         }
1361
1362         return count;
1363 }
1364
1365 static ssize_t
1366 acpi_video_bus_write_DOS(struct file *file,
1367                          const char __user * buffer,
1368                          size_t count, loff_t * data)
1369 {
1370         int status;
1371         struct seq_file *m = file->private_data;
1372         struct acpi_video_bus *video = m->private;
1373         char str[12] = { 0 };
1374         unsigned long opt;
1375
1376
1377         if (!video || count + 1 > sizeof str)
1378                 return -EINVAL;
1379
1380         if (copy_from_user(str, buffer, count))
1381                 return -EFAULT;
1382
1383         str[count] = 0;
1384         opt = strtoul(str, NULL, 0);
1385         if (opt > 7)
1386                 return -EFAULT;
1387
1388         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1389
1390         if (!ACPI_SUCCESS(status))
1391                 return -EFAULT;
1392
1393         return count;
1394 }
1395
1396 static int acpi_video_bus_add_fs(struct acpi_device *device)
1397 {
1398         struct acpi_video_bus *video = acpi_driver_data(device);
1399         struct proc_dir_entry *device_dir;
1400         struct proc_dir_entry *entry;
1401
1402         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1403         if (!device_dir)
1404                 return -ENOMEM;
1405
1406         device_dir->owner = THIS_MODULE;
1407
1408         /* 'info' [R] */
1409         entry = proc_create_data("info", S_IRUGO, device_dir,
1410                                  &acpi_video_bus_info_fops,
1411                                  acpi_driver_data(device));
1412         if (!entry)
1413                 goto err_remove_dir;
1414
1415         /* 'ROM' [R] */
1416         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1417                                  &acpi_video_bus_ROM_fops,
1418                                  acpi_driver_data(device));
1419         if (!entry)
1420                 goto err_remove_info;
1421
1422         /* 'POST_info' [R] */
1423         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1424                                  &acpi_video_bus_POST_info_fops,
1425                                  acpi_driver_data(device));
1426         if (!entry)
1427                 goto err_remove_rom;
1428
1429         /* 'POST' [R/W] */
1430         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1431         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1432                                  device_dir,
1433                                  &acpi_video_bus_POST_fops,
1434                                  acpi_driver_data(device));
1435         if (!entry)
1436                 goto err_remove_post_info;
1437
1438         /* 'DOS' [R/W] */
1439         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1440         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1441                                  device_dir,
1442                                  &acpi_video_bus_DOS_fops,
1443                                  acpi_driver_data(device));
1444         if (!entry)
1445                 goto err_remove_post;
1446
1447         video->dir = acpi_device_dir(device) = device_dir;
1448         return 0;
1449
1450  err_remove_post:
1451         remove_proc_entry("POST", device_dir);
1452  err_remove_post_info:
1453         remove_proc_entry("POST_info", device_dir);
1454  err_remove_rom:
1455         remove_proc_entry("ROM", device_dir);
1456  err_remove_info:
1457         remove_proc_entry("info", device_dir);
1458  err_remove_dir:
1459         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1460         return -ENOMEM;
1461 }
1462
1463 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1464 {
1465         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1466
1467         if (device_dir) {
1468                 remove_proc_entry("info", device_dir);
1469                 remove_proc_entry("ROM", device_dir);
1470                 remove_proc_entry("POST_info", device_dir);
1471                 remove_proc_entry("POST", device_dir);
1472                 remove_proc_entry("DOS", device_dir);
1473                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1474                 acpi_device_dir(device) = NULL;
1475         }
1476
1477         return 0;
1478 }
1479
1480 /* --------------------------------------------------------------------------
1481                                  Driver Interface
1482    -------------------------------------------------------------------------- */
1483
1484 /* device interface */
1485 static struct acpi_video_device_attrib*
1486 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1487 {
1488         struct acpi_video_enumerated_device *ids;
1489         int i;
1490
1491         for (i = 0; i < video->attached_count; i++) {
1492                 ids = &video->attached_array[i];
1493                 if ((ids->value.int_val & 0xffff) == device_id)
1494                         return &ids->value.attrib;
1495         }
1496
1497         return NULL;
1498 }
1499
1500 static int
1501 acpi_video_bus_get_one_device(struct acpi_device *device,
1502                               struct acpi_video_bus *video)
1503 {
1504         unsigned long long device_id;
1505         int status;
1506         struct acpi_video_device *data;
1507         struct acpi_video_device_attrib* attribute;
1508
1509         if (!device || !video)
1510                 return -EINVAL;
1511
1512         status =
1513             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1514         if (ACPI_SUCCESS(status)) {
1515
1516                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1517                 if (!data)
1518                         return -ENOMEM;
1519
1520                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1521                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1522                 device->driver_data = data;
1523
1524                 data->device_id = device_id;
1525                 data->video = video;
1526                 data->dev = device;
1527
1528                 attribute = acpi_video_get_device_attr(video, device_id);
1529
1530                 if((attribute != NULL) && attribute->device_id_scheme) {
1531                         switch (attribute->display_type) {
1532                         case ACPI_VIDEO_DISPLAY_CRT:
1533                                 data->flags.crt = 1;
1534                                 break;
1535                         case ACPI_VIDEO_DISPLAY_TV:
1536                                 data->flags.tvout = 1;
1537                                 break;
1538                         case ACPI_VIDEO_DISPLAY_DVI:
1539                                 data->flags.dvi = 1;
1540                                 break;
1541                         case ACPI_VIDEO_DISPLAY_LCD:
1542                                 data->flags.lcd = 1;
1543                                 break;
1544                         default:
1545                                 data->flags.unknown = 1;
1546                                 break;
1547                         }
1548                         if(attribute->bios_can_detect)
1549                                 data->flags.bios = 1;
1550                 } else
1551                         data->flags.unknown = 1;
1552
1553                 acpi_video_device_bind(video, data);
1554                 acpi_video_device_find_cap(data);
1555
1556                 status = acpi_install_notify_handler(device->handle,
1557                                                      ACPI_DEVICE_NOTIFY,
1558                                                      acpi_video_device_notify,
1559                                                      data);
1560                 if (ACPI_FAILURE(status)) {
1561                         printk(KERN_ERR PREFIX
1562                                           "Error installing notify handler\n");
1563                         if(data->brightness)
1564                                 kfree(data->brightness->levels);
1565                         kfree(data->brightness);
1566                         kfree(data);
1567                         return -ENODEV;
1568                 }
1569
1570                 mutex_lock(&video->device_list_lock);
1571                 list_add_tail(&data->entry, &video->video_device_list);
1572                 mutex_unlock(&video->device_list_lock);
1573
1574                 acpi_video_device_add_fs(device);
1575
1576                 return 0;
1577         }
1578
1579         return -ENOENT;
1580 }
1581
1582 /*
1583  *  Arg:
1584  *      video   : video bus device 
1585  *
1586  *  Return:
1587  *      none
1588  *  
1589  *  Enumerate the video device list of the video bus, 
1590  *  bind the ids with the corresponding video devices
1591  *  under the video bus.
1592  */
1593
1594 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1595 {
1596         struct acpi_video_device *dev;
1597
1598         mutex_lock(&video->device_list_lock);
1599
1600         list_for_each_entry(dev, &video->video_device_list, entry)
1601                 acpi_video_device_bind(video, dev);
1602
1603         mutex_unlock(&video->device_list_lock);
1604 }
1605
1606 /*
1607  *  Arg:
1608  *      video   : video bus device 
1609  *      device  : video output device under the video 
1610  *              bus
1611  *
1612  *  Return:
1613  *      none
1614  *  
1615  *  Bind the ids with the corresponding video devices
1616  *  under the video bus.
1617  */
1618
1619 static void
1620 acpi_video_device_bind(struct acpi_video_bus *video,
1621                        struct acpi_video_device *device)
1622 {
1623         struct acpi_video_enumerated_device *ids;
1624         int i;
1625
1626         for (i = 0; i < video->attached_count; i++) {
1627                 ids = &video->attached_array[i];
1628                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1629                         ids->bind_info = device;
1630                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1631                 }
1632         }
1633 }
1634
1635 /*
1636  *  Arg:
1637  *      video   : video bus device 
1638  *
1639  *  Return:
1640  *      < 0     : error
1641  *  
1642  *  Call _DOD to enumerate all devices attached to display adapter
1643  *
1644  */
1645
1646 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1647 {
1648         int status;
1649         int count;
1650         int i;
1651         struct acpi_video_enumerated_device *active_list;
1652         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1653         union acpi_object *dod = NULL;
1654         union acpi_object *obj;
1655
1656         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1657         if (!ACPI_SUCCESS(status)) {
1658                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1659                 return status;
1660         }
1661
1662         dod = buffer.pointer;
1663         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1664                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1665                 status = -EFAULT;
1666                 goto out;
1667         }
1668
1669         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1670                           dod->package.count));
1671
1672         active_list = kcalloc(1 + dod->package.count,
1673                               sizeof(struct acpi_video_enumerated_device),
1674                               GFP_KERNEL);
1675         if (!active_list) {
1676                 status = -ENOMEM;
1677                 goto out;
1678         }
1679
1680         count = 0;
1681         for (i = 0; i < dod->package.count; i++) {
1682                 obj = &dod->package.elements[i];
1683
1684                 if (obj->type != ACPI_TYPE_INTEGER) {
1685                         printk(KERN_ERR PREFIX
1686                                 "Invalid _DOD data in element %d\n", i);
1687                         continue;
1688                 }
1689
1690                 active_list[count].value.int_val = obj->integer.value;
1691                 active_list[count].bind_info = NULL;
1692                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1693                                   (int)obj->integer.value));
1694                 count++;
1695         }
1696
1697         kfree(video->attached_array);
1698
1699         video->attached_array = active_list;
1700         video->attached_count = count;
1701
1702  out:
1703         kfree(buffer.pointer);
1704         return status;
1705 }
1706
1707 static int
1708 acpi_video_get_next_level(struct acpi_video_device *device,
1709                           u32 level_current, u32 event)
1710 {
1711         int min, max, min_above, max_below, i, l, delta = 255;
1712         max = max_below = 0;
1713         min = min_above = 255;
1714         /* Find closest level to level_current */
1715         for (i = 0; i < device->brightness->count; i++) {
1716                 l = device->brightness->levels[i];
1717                 if (abs(l - level_current) < abs(delta)) {
1718                         delta = l - level_current;
1719                         if (!delta)
1720                                 break;
1721                 }
1722         }
1723         /* Ajust level_current to closest available level */
1724         level_current += delta;
1725         for (i = 0; i < device->brightness->count; i++) {
1726                 l = device->brightness->levels[i];
1727                 if (l < min)
1728                         min = l;
1729                 if (l > max)
1730                         max = l;
1731                 if (l < min_above && l > level_current)
1732                         min_above = l;
1733                 if (l > max_below && l < level_current)
1734                         max_below = l;
1735         }
1736
1737         switch (event) {
1738         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1739                 return (level_current < max) ? min_above : min;
1740         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1741                 return (level_current < max) ? min_above : max;
1742         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1743                 return (level_current > min) ? max_below : min;
1744         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1745         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1746                 return 0;
1747         default:
1748                 return level_current;
1749         }
1750 }
1751
1752 static void
1753 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1754 {
1755         unsigned long long level_current, level_next;
1756         if (!device->brightness)
1757                 return;
1758         acpi_video_device_lcd_get_level_current(device, &level_current);
1759         level_next = acpi_video_get_next_level(device, level_current, event);
1760         acpi_video_device_lcd_set_level(device, level_next);
1761 }
1762
1763 static int
1764 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1765                            struct acpi_device *device)
1766 {
1767         int status = 0;
1768         struct acpi_device *dev;
1769
1770         acpi_video_device_enumerate(video);
1771
1772         list_for_each_entry(dev, &device->children, node) {
1773
1774                 status = acpi_video_bus_get_one_device(dev, video);
1775                 if (ACPI_FAILURE(status)) {
1776                         printk(KERN_WARNING PREFIX
1777                                         "Cant attach device");
1778                         continue;
1779                 }
1780         }
1781         return status;
1782 }
1783
1784 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1785 {
1786         acpi_status status;
1787         struct acpi_video_bus *video;
1788
1789
1790         if (!device || !device->video)
1791                 return -ENOENT;
1792
1793         video = device->video;
1794
1795         acpi_video_device_remove_fs(device->dev);
1796
1797         status = acpi_remove_notify_handler(device->dev->handle,
1798                                             ACPI_DEVICE_NOTIFY,
1799                                             acpi_video_device_notify);
1800         backlight_device_unregister(device->backlight);
1801         if (device->cdev) {
1802                 sysfs_remove_link(&device->dev->dev.kobj,
1803                                   "thermal_cooling");
1804                 sysfs_remove_link(&device->cdev->device.kobj,
1805                                   "device");
1806                 thermal_cooling_device_unregister(device->cdev);
1807                 device->cdev = NULL;
1808         }
1809         video_output_unregister(device->output_dev);
1810
1811         return 0;
1812 }
1813
1814 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1815 {
1816         int status;
1817         struct acpi_video_device *dev, *next;
1818
1819         mutex_lock(&video->device_list_lock);
1820
1821         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1822
1823                 status = acpi_video_bus_put_one_device(dev);
1824                 if (ACPI_FAILURE(status))
1825                         printk(KERN_WARNING PREFIX
1826                                "hhuuhhuu bug in acpi video driver.\n");
1827
1828                 if (dev->brightness) {
1829                         kfree(dev->brightness->levels);
1830                         kfree(dev->brightness);
1831                 }
1832                 list_del(&dev->entry);
1833                 kfree(dev);
1834         }
1835
1836         mutex_unlock(&video->device_list_lock);
1837
1838         return 0;
1839 }
1840
1841 /* acpi_video interface */
1842
1843 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1844 {
1845         return acpi_video_bus_DOS(video, 0, 0);
1846 }
1847
1848 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1849 {
1850         return acpi_video_bus_DOS(video, 0, 1);
1851 }
1852
1853 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1854 {
1855         struct acpi_video_bus *video = data;
1856         struct acpi_device *device = NULL;
1857         struct input_dev *input;
1858         int keycode;
1859
1860         if (!video)
1861                 return;
1862
1863         device = video->device;
1864         input = video->input;
1865
1866         switch (event) {
1867         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1868                                          * most likely via hotkey. */
1869                 acpi_bus_generate_proc_event(device, event, 0);
1870                 keycode = KEY_SWITCHVIDEOMODE;
1871                 break;
1872
1873         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1874                                          * connector. */
1875                 acpi_video_device_enumerate(video);
1876                 acpi_video_device_rebind(video);
1877                 acpi_bus_generate_proc_event(device, event, 0);
1878                 keycode = KEY_SWITCHVIDEOMODE;
1879                 break;
1880
1881         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1882                 acpi_bus_generate_proc_event(device, event, 0);
1883                 keycode = KEY_SWITCHVIDEOMODE;
1884                 break;
1885         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1886                 acpi_bus_generate_proc_event(device, event, 0);
1887                 keycode = KEY_VIDEO_NEXT;
1888                 break;
1889         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1890                 acpi_bus_generate_proc_event(device, event, 0);
1891                 keycode = KEY_VIDEO_PREV;
1892                 break;
1893
1894         default:
1895                 keycode = KEY_UNKNOWN;
1896                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1897                                   "Unsupported event [0x%x]\n", event));
1898                 break;
1899         }
1900
1901         acpi_notifier_call_chain(device, event, 0);
1902         input_report_key(input, keycode, 1);
1903         input_sync(input);
1904         input_report_key(input, keycode, 0);
1905         input_sync(input);
1906
1907         return;
1908 }
1909
1910 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1911 {
1912         struct acpi_video_device *video_device = data;
1913         struct acpi_device *device = NULL;
1914         struct acpi_video_bus *bus;
1915         struct input_dev *input;
1916         int keycode;
1917
1918         if (!video_device)
1919                 return;
1920
1921         device = video_device->dev;
1922         bus = video_device->video;
1923         input = bus->input;
1924
1925         switch (event) {
1926         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1927                 if (brightness_switch_enabled)
1928                         acpi_video_switch_brightness(video_device, event);
1929                 acpi_bus_generate_proc_event(device, event, 0);
1930                 keycode = KEY_BRIGHTNESS_CYCLE;
1931                 break;
1932         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1933                 if (brightness_switch_enabled)
1934                         acpi_video_switch_brightness(video_device, event);
1935                 acpi_bus_generate_proc_event(device, event, 0);
1936                 keycode = KEY_BRIGHTNESSUP;
1937                 break;
1938         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1939                 if (brightness_switch_enabled)
1940                         acpi_video_switch_brightness(video_device, event);
1941                 acpi_bus_generate_proc_event(device, event, 0);
1942                 keycode = KEY_BRIGHTNESSDOWN;
1943                 break;
1944         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1945                 if (brightness_switch_enabled)
1946                         acpi_video_switch_brightness(video_device, event);
1947                 acpi_bus_generate_proc_event(device, event, 0);
1948                 keycode = KEY_BRIGHTNESS_ZERO;
1949                 break;
1950         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1951                 if (brightness_switch_enabled)
1952                         acpi_video_switch_brightness(video_device, event);
1953                 acpi_bus_generate_proc_event(device, event, 0);
1954                 keycode = KEY_DISPLAY_OFF;
1955                 break;
1956         default:
1957                 keycode = KEY_UNKNOWN;
1958                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1959                                   "Unsupported event [0x%x]\n", event));
1960                 break;
1961         }
1962
1963         acpi_notifier_call_chain(device, event, 0);
1964         input_report_key(input, keycode, 1);
1965         input_sync(input);
1966         input_report_key(input, keycode, 0);
1967         input_sync(input);
1968
1969         return;
1970 }
1971
1972 static int instance;
1973 static int acpi_video_resume(struct acpi_device *device)
1974 {
1975         struct acpi_video_bus *video;
1976         struct acpi_video_device *video_device;
1977         int i;
1978
1979         if (!device || !acpi_driver_data(device))
1980                 return -EINVAL;
1981
1982         video = acpi_driver_data(device);
1983
1984         for (i = 0; i < video->attached_count; i++) {
1985                 video_device = video->attached_array[i].bind_info;
1986                 if (video_device && video_device->backlight)
1987                         acpi_video_set_brightness(video_device->backlight);
1988         }
1989         return AE_OK;
1990 }
1991
1992 static int acpi_video_bus_add(struct acpi_device *device)
1993 {
1994         acpi_status status;
1995         struct acpi_video_bus *video;
1996         struct input_dev *input;
1997         int error;
1998
1999         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2000         if (!video)
2001                 return -ENOMEM;
2002
2003         /* a hack to fix the duplicate name "VID" problem on T61 */
2004         if (!strcmp(device->pnp.bus_id, "VID")) {
2005                 if (instance)
2006                         device->pnp.bus_id[3] = '0' + instance;
2007                 instance ++;
2008         }
2009
2010         video->device = device;
2011         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2012         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2013         device->driver_data = video;
2014
2015         acpi_video_bus_find_cap(video);
2016         error = acpi_video_bus_check(video);
2017         if (error)
2018                 goto err_free_video;
2019
2020         error = acpi_video_bus_add_fs(device);
2021         if (error)
2022                 goto err_free_video;
2023
2024         mutex_init(&video->device_list_lock);
2025         INIT_LIST_HEAD(&video->video_device_list);
2026
2027         acpi_video_bus_get_devices(video, device);
2028         acpi_video_bus_start_devices(video);
2029
2030         status = acpi_install_notify_handler(device->handle,
2031                                              ACPI_DEVICE_NOTIFY,
2032                                              acpi_video_bus_notify, video);
2033         if (ACPI_FAILURE(status)) {
2034                 printk(KERN_ERR PREFIX
2035                                   "Error installing notify handler\n");
2036                 error = -ENODEV;
2037                 goto err_stop_video;
2038         }
2039
2040         video->input = input = input_allocate_device();
2041         if (!input) {
2042                 error = -ENOMEM;
2043                 goto err_uninstall_notify;
2044         }
2045
2046         snprintf(video->phys, sizeof(video->phys),
2047                 "%s/video/input0", acpi_device_hid(video->device));
2048
2049         input->name = acpi_device_name(video->device);
2050         input->phys = video->phys;
2051         input->id.bustype = BUS_HOST;
2052         input->id.product = 0x06;
2053         input->dev.parent = &device->dev;
2054         input->evbit[0] = BIT(EV_KEY);
2055         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2056         set_bit(KEY_VIDEO_NEXT, input->keybit);
2057         set_bit(KEY_VIDEO_PREV, input->keybit);
2058         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2059         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2060         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2061         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2062         set_bit(KEY_DISPLAY_OFF, input->keybit);
2063         set_bit(KEY_UNKNOWN, input->keybit);
2064
2065         error = input_register_device(input);
2066         if (error)
2067                 goto err_free_input_dev;
2068
2069         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2070                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2071                video->flags.multihead ? "yes" : "no",
2072                video->flags.rom ? "yes" : "no",
2073                video->flags.post ? "yes" : "no");
2074
2075         return 0;
2076
2077  err_free_input_dev:
2078         input_free_device(input);
2079  err_uninstall_notify:
2080         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2081                                    acpi_video_bus_notify);
2082  err_stop_video:
2083         acpi_video_bus_stop_devices(video);
2084         acpi_video_bus_put_devices(video);
2085         kfree(video->attached_array);
2086         acpi_video_bus_remove_fs(device);
2087  err_free_video:
2088         kfree(video);
2089         device->driver_data = NULL;
2090
2091         return error;
2092 }
2093
2094 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2095 {
2096         acpi_status status = 0;
2097         struct acpi_video_bus *video = NULL;
2098
2099
2100         if (!device || !acpi_driver_data(device))
2101                 return -EINVAL;
2102
2103         video = acpi_driver_data(device);
2104
2105         acpi_video_bus_stop_devices(video);
2106
2107         status = acpi_remove_notify_handler(video->device->handle,
2108                                             ACPI_DEVICE_NOTIFY,
2109                                             acpi_video_bus_notify);
2110
2111         acpi_video_bus_put_devices(video);
2112         acpi_video_bus_remove_fs(device);
2113
2114         input_unregister_device(video->input);
2115         kfree(video->attached_array);
2116         kfree(video);
2117
2118         return 0;
2119 }
2120
2121 static int __init acpi_video_init(void)
2122 {
2123         int result = 0;
2124
2125         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2126         if (!acpi_video_dir)
2127                 return -ENODEV;
2128         acpi_video_dir->owner = THIS_MODULE;
2129
2130         result = acpi_bus_register_driver(&acpi_video_bus);
2131         if (result < 0) {
2132                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2133                 return -ENODEV;
2134         }
2135
2136         return 0;
2137 }
2138
2139 static void __exit acpi_video_exit(void)
2140 {
2141
2142         acpi_bus_unregister_driver(&acpi_video_bus);
2143
2144         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2145
2146         return;
2147 }
2148
2149 module_init(acpi_video_init);
2150 module_exit(acpi_video_exit);