56666a9824760bc0fbf569aba85518a38ce995cb
[linux-2.6.git] / drivers / acpi / video.c
1 /*
2  *  video.c - ACPI Video Driver ($Revision:$)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/list.h>
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33
34 #include <asm/uaccess.h>
35
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
38
39 #define ACPI_VIDEO_COMPONENT            0x08000000
40 #define ACPI_VIDEO_CLASS                "video"
41 #define ACPI_VIDEO_DRIVER_NAME          "ACPI Video Driver"
42 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
43 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
44 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
45 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
46 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
47 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
48 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
49
50 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x82
51 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x83
52 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x84
53 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x85
54 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x86
55
56 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
57 #define ACPI_VIDEO_HEAD_END             (~0u)
58
59 #define _COMPONENT              ACPI_VIDEO_COMPONENT
60 ACPI_MODULE_NAME("acpi_video")
61
62     MODULE_AUTHOR("Bruno Ducrot");
63 MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
64 MODULE_LICENSE("GPL");
65
66 static int acpi_video_bus_add(struct acpi_device *device);
67 static int acpi_video_bus_remove(struct acpi_device *device, int type);
68 static int acpi_video_bus_match(struct acpi_device *device,
69                                 struct acpi_driver *driver);
70
71 static struct acpi_driver acpi_video_bus = {
72         .name = ACPI_VIDEO_DRIVER_NAME,
73         .class = ACPI_VIDEO_CLASS,
74         .ops = {
75                 .add = acpi_video_bus_add,
76                 .remove = acpi_video_bus_remove,
77                 .match = acpi_video_bus_match,
78                 },
79 };
80
81 struct acpi_video_bus_flags {
82         u8 multihead:1;         /* can switch video heads */
83         u8 rom:1;               /* can retrieve a video rom */
84         u8 post:1;              /* can configure the head to */
85         u8 reserved:5;
86 };
87
88 struct acpi_video_bus_cap {
89         u8 _DOS:1;              /*Enable/Disable output switching */
90         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
91         u8 _ROM:1;              /*Get ROM Data */
92         u8 _GPD:1;              /*Get POST Device */
93         u8 _SPD:1;              /*Set POST Device */
94         u8 _VPO:1;              /*Video POST Options */
95         u8 reserved:2;
96 };
97
98 struct acpi_video_device_attrib {
99         u32 display_index:4;    /* A zero-based instance of the Display */
100         u32 display_port_attachment:4;  /*This field differenates displays type */
101         u32 display_type:4;     /*Describe the specific type in use */
102         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
103         u32 bios_can_detect:1;  /*BIOS can detect the device */
104         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
105                                    the VGA device. */
106         u32 pipe_id:3;          /*For VGA multiple-head devices. */
107         u32 reserved:10;        /*Must be 0 */
108         u32 device_id_scheme:1; /*Device ID Scheme */
109 };
110
111 struct acpi_video_enumerated_device {
112         union {
113                 u32 int_val;
114                 struct acpi_video_device_attrib attrib;
115         } value;
116         struct acpi_video_device *bind_info;
117 };
118
119 struct acpi_video_bus {
120         struct acpi_device *device;
121         u8 dos_setting;
122         struct acpi_video_enumerated_device *attached_array;
123         u8 attached_count;
124         struct acpi_video_bus_cap cap;
125         struct acpi_video_bus_flags flags;
126         struct semaphore sem;
127         struct list_head video_device_list;
128         struct proc_dir_entry *dir;
129 };
130
131 struct acpi_video_device_flags {
132         u8 crt:1;
133         u8 lcd:1;
134         u8 tvout:1;
135         u8 bios:1;
136         u8 unknown:1;
137         u8 reserved:3;
138 };
139
140 struct acpi_video_device_cap {
141         u8 _ADR:1;              /*Return the unique ID */
142         u8 _BCL:1;              /*Query list of brightness control levels supported */
143         u8 _BCM:1;              /*Set the brightness level */
144         u8 _DDC:1;              /*Return the EDID for this device */
145         u8 _DCS:1;              /*Return status of output device */
146         u8 _DGS:1;              /*Query graphics state */
147         u8 _DSS:1;              /*Device state set */
148         u8 _reserved:1;
149 };
150
151 struct acpi_video_device_brightness {
152         int curr;
153         int count;
154         int *levels;
155 };
156
157 struct acpi_video_device {
158         unsigned long device_id;
159         struct acpi_video_device_flags flags;
160         struct acpi_video_device_cap cap;
161         struct list_head entry;
162         struct acpi_video_bus *video;
163         struct acpi_device *dev;
164         struct acpi_video_device_brightness *brightness;
165 };
166
167 /* bus */
168 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
169 static struct file_operations acpi_video_bus_info_fops = {
170         .open = acpi_video_bus_info_open_fs,
171         .read = seq_read,
172         .llseek = seq_lseek,
173         .release = single_release,
174 };
175
176 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
177 static struct file_operations acpi_video_bus_ROM_fops = {
178         .open = acpi_video_bus_ROM_open_fs,
179         .read = seq_read,
180         .llseek = seq_lseek,
181         .release = single_release,
182 };
183
184 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
185                                             struct file *file);
186 static struct file_operations acpi_video_bus_POST_info_fops = {
187         .open = acpi_video_bus_POST_info_open_fs,
188         .read = seq_read,
189         .llseek = seq_lseek,
190         .release = single_release,
191 };
192
193 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
194 static struct file_operations acpi_video_bus_POST_fops = {
195         .open = acpi_video_bus_POST_open_fs,
196         .read = seq_read,
197         .llseek = seq_lseek,
198         .release = single_release,
199 };
200
201 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
202 static struct file_operations acpi_video_bus_DOS_fops = {
203         .open = acpi_video_bus_DOS_open_fs,
204         .read = seq_read,
205         .llseek = seq_lseek,
206         .release = single_release,
207 };
208
209 /* device */
210 static int acpi_video_device_info_open_fs(struct inode *inode,
211                                           struct file *file);
212 static struct file_operations acpi_video_device_info_fops = {
213         .open = acpi_video_device_info_open_fs,
214         .read = seq_read,
215         .llseek = seq_lseek,
216         .release = single_release,
217 };
218
219 static int acpi_video_device_state_open_fs(struct inode *inode,
220                                            struct file *file);
221 static struct file_operations acpi_video_device_state_fops = {
222         .open = acpi_video_device_state_open_fs,
223         .read = seq_read,
224         .llseek = seq_lseek,
225         .release = single_release,
226 };
227
228 static int acpi_video_device_brightness_open_fs(struct inode *inode,
229                                                 struct file *file);
230 static struct file_operations acpi_video_device_brightness_fops = {
231         .open = acpi_video_device_brightness_open_fs,
232         .read = seq_read,
233         .llseek = seq_lseek,
234         .release = single_release,
235 };
236
237 static int acpi_video_device_EDID_open_fs(struct inode *inode,
238                                           struct file *file);
239 static struct file_operations acpi_video_device_EDID_fops = {
240         .open = acpi_video_device_EDID_open_fs,
241         .read = seq_read,
242         .llseek = seq_lseek,
243         .release = single_release,
244 };
245
246 static char device_decode[][30] = {
247         "motherboard VGA device",
248         "PCI VGA device",
249         "AGP VGA device",
250         "UNKNOWN",
251 };
252
253 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
254 static void acpi_video_device_rebind(struct acpi_video_bus *video);
255 static void acpi_video_device_bind(struct acpi_video_bus *video,
256                                    struct acpi_video_device *device);
257 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
258 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
259 static int acpi_video_get_next_level(struct acpi_video_device *device,
260                                      u32 level_current, u32 event);
261 static void acpi_video_switch_brightness(struct acpi_video_device *device,
262                                          int event);
263
264 /* --------------------------------------------------------------------------
265                                Video Management
266    -------------------------------------------------------------------------- */
267
268 /* device */
269
270 static int
271 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
272 {
273         int status;
274
275         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
276
277         return status;
278 }
279
280 static int
281 acpi_video_device_get_state(struct acpi_video_device *device,
282                             unsigned long *state)
283 {
284         int status;
285
286         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
287
288         return status;
289 }
290
291 static int
292 acpi_video_device_set_state(struct acpi_video_device *device, int state)
293 {
294         int status;
295         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
296         struct acpi_object_list args = { 1, &arg0 };
297         unsigned long ret;
298
299
300         arg0.integer.value = state;
301         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
302
303         return status;
304 }
305
306 static int
307 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
308                                    union acpi_object **levels)
309 {
310         int status;
311         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
312         union acpi_object *obj;
313
314
315         *levels = NULL;
316
317         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
318         if (!ACPI_SUCCESS(status))
319                 return status;
320         obj = (union acpi_object *)buffer.pointer;
321         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
322                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
323                 status = -EFAULT;
324                 goto err;
325         }
326
327         *levels = obj;
328
329         return 0;
330
331       err:
332         kfree(buffer.pointer);
333
334         return status;
335 }
336
337 static int
338 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
339 {
340         int status;
341         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
342         struct acpi_object_list args = { 1, &arg0 };
343
344
345         arg0.integer.value = level;
346         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
347
348         printk(KERN_DEBUG "set_level status: %x\n", status);
349         return status;
350 }
351
352 static int
353 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
354                                         unsigned long *level)
355 {
356         int status;
357
358         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
359
360         return status;
361 }
362
363 static int
364 acpi_video_device_EDID(struct acpi_video_device *device,
365                        union acpi_object **edid, ssize_t length)
366 {
367         int status;
368         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
369         union acpi_object *obj;
370         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
371         struct acpi_object_list args = { 1, &arg0 };
372
373
374         *edid = NULL;
375
376         if (!device)
377                 return -ENODEV;
378         if (length == 128)
379                 arg0.integer.value = 1;
380         else if (length == 256)
381                 arg0.integer.value = 2;
382         else
383                 return -EINVAL;
384
385         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
386         if (ACPI_FAILURE(status))
387                 return -ENODEV;
388
389         obj = (union acpi_object *)buffer.pointer;
390
391         if (obj && obj->type == ACPI_TYPE_BUFFER)
392                 *edid = obj;
393         else {
394                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
395                 status = -EFAULT;
396                 kfree(obj);
397         }
398
399         return status;
400 }
401
402 /* bus */
403
404 static int
405 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
406 {
407         int status;
408         unsigned long tmp;
409         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
410         struct acpi_object_list args = { 1, &arg0 };
411
412
413         arg0.integer.value = option;
414
415         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
416         if (ACPI_SUCCESS(status))
417                 status = tmp ? (-EINVAL) : (AE_OK);
418
419         return status;
420 }
421
422 static int
423 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
424 {
425         int status;
426
427         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
428
429         return status;
430 }
431
432 static int
433 acpi_video_bus_POST_options(struct acpi_video_bus *video,
434                             unsigned long *options)
435 {
436         int status;
437
438         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
439         *options &= 3;
440
441         return status;
442 }
443
444 /*
445  *  Arg:
446  *      video           : video bus device pointer
447  *      bios_flag       : 
448  *              0.      The system BIOS should NOT automatically switch(toggle)
449  *                      the active display output.
450  *              1.      The system BIOS should automatically switch (toggle) the
451  *                      active display output. No swich event.
452  *              2.      The _DGS value should be locked.
453  *              3.      The system BIOS should not automatically switch (toggle) the
454  *                      active display output, but instead generate the display switch
455  *                      event notify code.
456  *      lcd_flag        :
457  *              0.      The system BIOS should automatically control the brightness level
458  *                      of the LCD, when the power changes from AC to DC
459  *              1.      The system BIOS should NOT automatically control the brightness 
460  *                      level of the LCD, when the power changes from AC to DC.
461  * Return Value:
462  *              -1      wrong arg.
463  */
464
465 static int
466 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
467 {
468         acpi_integer status = 0;
469         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
470         struct acpi_object_list args = { 1, &arg0 };
471
472
473         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
474                 status = -1;
475                 goto Failed;
476         }
477         arg0.integer.value = (lcd_flag << 2) | bios_flag;
478         video->dos_setting = arg0.integer.value;
479         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
480
481       Failed:
482         return status;
483 }
484
485 /*
486  *  Arg:        
487  *      device  : video output device (LCD, CRT, ..)
488  *
489  *  Return Value:
490  *      None
491  *
492  *  Find out all required AML method defined under the output
493  *  device.
494  */
495
496 static void acpi_video_device_find_cap(struct acpi_video_device *device)
497 {
498         acpi_integer status;
499         acpi_handle h_dummy1;
500         int i;
501         union acpi_object *obj = NULL;
502         struct acpi_video_device_brightness *br = NULL;
503
504
505         memset(&device->cap, 0, 4);
506
507         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
508                 device->cap._ADR = 1;
509         }
510         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
511                 device->cap._BCL = 1;
512         }
513         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
514                 device->cap._BCM = 1;
515         }
516         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
517                 device->cap._DDC = 1;
518         }
519         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
520                 device->cap._DCS = 1;
521         }
522         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
523                 device->cap._DGS = 1;
524         }
525         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
526                 device->cap._DSS = 1;
527         }
528
529         status = acpi_video_device_lcd_query_levels(device, &obj);
530
531         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
532                 int count = 0;
533                 union acpi_object *o;
534
535                 br = kmalloc(sizeof(*br), GFP_KERNEL);
536                 if (!br) {
537                         printk(KERN_ERR "can't allocate memory\n");
538                 } else {
539                         memset(br, 0, sizeof(*br));
540                         br->levels = kmalloc(obj->package.count *
541                                              sizeof *(br->levels), GFP_KERNEL);
542                         if (!br->levels)
543                                 goto out;
544
545                         for (i = 0; i < obj->package.count; i++) {
546                                 o = (union acpi_object *)&obj->package.
547                                     elements[i];
548                                 if (o->type != ACPI_TYPE_INTEGER) {
549                                         printk(KERN_ERR PREFIX "Invalid data\n");
550                                         continue;
551                                 }
552                                 br->levels[count] = (u32) o->integer.value;
553                                 count++;
554                         }
555                       out:
556                         if (count < 2) {
557                                 kfree(br->levels);
558                                 kfree(br);
559                         } else {
560                                 br->count = count;
561                                 device->brightness = br;
562                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
563                                                   "found %d brightness levels\n",
564                                                   count));
565                         }
566                 }
567         }
568
569         kfree(obj);
570
571         return;
572 }
573
574 /*
575  *  Arg:        
576  *      device  : video output device (VGA)
577  *
578  *  Return Value:
579  *      None
580  *
581  *  Find out all required AML method defined under the video bus device.
582  */
583
584 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
585 {
586         acpi_handle h_dummy1;
587
588         memset(&video->cap, 0, 4);
589         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
590                 video->cap._DOS = 1;
591         }
592         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
593                 video->cap._DOD = 1;
594         }
595         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
596                 video->cap._ROM = 1;
597         }
598         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
599                 video->cap._GPD = 1;
600         }
601         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
602                 video->cap._SPD = 1;
603         }
604         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
605                 video->cap._VPO = 1;
606         }
607 }
608
609 /*
610  * Check whether the video bus device has required AML method to
611  * support the desired features
612  */
613
614 static int acpi_video_bus_check(struct acpi_video_bus *video)
615 {
616         acpi_status status = -ENOENT;
617
618
619         if (!video)
620                 return -EINVAL;
621
622         /* Since there is no HID, CID and so on for VGA driver, we have
623          * to check well known required nodes.
624          */
625
626         /* Does this device able to support video switching ? */
627         if (video->cap._DOS) {
628                 video->flags.multihead = 1;
629                 status = 0;
630         }
631
632         /* Does this device able to retrieve a retrieve a video ROM ? */
633         if (video->cap._ROM) {
634                 video->flags.rom = 1;
635                 status = 0;
636         }
637
638         /* Does this device able to configure which video device to POST ? */
639         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
640                 video->flags.post = 1;
641                 status = 0;
642         }
643
644         return status;
645 }
646
647 /* --------------------------------------------------------------------------
648                               FS Interface (/proc)
649    -------------------------------------------------------------------------- */
650
651 static struct proc_dir_entry *acpi_video_dir;
652
653 /* video devices */
654
655 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
656 {
657         struct acpi_video_device *dev =
658             (struct acpi_video_device *)seq->private;
659
660
661         if (!dev)
662                 goto end;
663
664         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
665         seq_printf(seq, "type:         ");
666         if (dev->flags.crt)
667                 seq_printf(seq, "CRT\n");
668         else if (dev->flags.lcd)
669                 seq_printf(seq, "LCD\n");
670         else if (dev->flags.tvout)
671                 seq_printf(seq, "TVOUT\n");
672         else
673                 seq_printf(seq, "UNKNOWN\n");
674
675         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
676
677       end:
678         return 0;
679 }
680
681 static int
682 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
683 {
684         return single_open(file, acpi_video_device_info_seq_show,
685                            PDE(inode)->data);
686 }
687
688 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
689 {
690         int status;
691         struct acpi_video_device *dev =
692             (struct acpi_video_device *)seq->private;
693         unsigned long state;
694
695
696         if (!dev)
697                 goto end;
698
699         status = acpi_video_device_get_state(dev, &state);
700         seq_printf(seq, "state:     ");
701         if (ACPI_SUCCESS(status))
702                 seq_printf(seq, "0x%02lx\n", state);
703         else
704                 seq_printf(seq, "<not supported>\n");
705
706         status = acpi_video_device_query(dev, &state);
707         seq_printf(seq, "query:     ");
708         if (ACPI_SUCCESS(status))
709                 seq_printf(seq, "0x%02lx\n", state);
710         else
711                 seq_printf(seq, "<not supported>\n");
712
713       end:
714         return 0;
715 }
716
717 static int
718 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
719 {
720         return single_open(file, acpi_video_device_state_seq_show,
721                            PDE(inode)->data);
722 }
723
724 static ssize_t
725 acpi_video_device_write_state(struct file *file,
726                               const char __user * buffer,
727                               size_t count, loff_t * data)
728 {
729         int status;
730         struct seq_file *m = (struct seq_file *)file->private_data;
731         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
732         char str[12] = { 0 };
733         u32 state = 0;
734
735
736         if (!dev || count + 1 > sizeof str)
737                 return -EINVAL;
738
739         if (copy_from_user(str, buffer, count))
740                 return -EFAULT;
741
742         str[count] = 0;
743         state = simple_strtoul(str, NULL, 0);
744         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
745
746         status = acpi_video_device_set_state(dev, state);
747
748         if (status)
749                 return -EFAULT;
750
751         return count;
752 }
753
754 static int
755 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
756 {
757         struct acpi_video_device *dev =
758             (struct acpi_video_device *)seq->private;
759         int i;
760
761
762         if (!dev || !dev->brightness) {
763                 seq_printf(seq, "<not supported>\n");
764                 return 0;
765         }
766
767         seq_printf(seq, "levels: ");
768         for (i = 0; i < dev->brightness->count; i++)
769                 seq_printf(seq, " %d", dev->brightness->levels[i]);
770         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
771
772         return 0;
773 }
774
775 static int
776 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
777 {
778         return single_open(file, acpi_video_device_brightness_seq_show,
779                            PDE(inode)->data);
780 }
781
782 static ssize_t
783 acpi_video_device_write_brightness(struct file *file,
784                                    const char __user * buffer,
785                                    size_t count, loff_t * data)
786 {
787         struct seq_file *m = (struct seq_file *)file->private_data;
788         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
789         char str[4] = { 0 };
790         unsigned int level = 0;
791         int i;
792
793
794         if (!dev || !dev->brightness || count + 1 > sizeof str)
795                 return -EINVAL;
796
797         if (copy_from_user(str, buffer, count))
798                 return -EFAULT;
799
800         str[count] = 0;
801         level = simple_strtoul(str, NULL, 0);
802
803         if (level > 100)
804                 return -EFAULT;
805
806         /* validate though the list of available levels */
807         for (i = 0; i < dev->brightness->count; i++)
808                 if (level == dev->brightness->levels[i]) {
809                         if (ACPI_SUCCESS
810                             (acpi_video_device_lcd_set_level(dev, level)))
811                                 dev->brightness->curr = level;
812                         break;
813                 }
814
815         return count;
816 }
817
818 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
819 {
820         struct acpi_video_device *dev =
821             (struct acpi_video_device *)seq->private;
822         int status;
823         int i;
824         union acpi_object *edid = NULL;
825
826
827         if (!dev)
828                 goto out;
829
830         status = acpi_video_device_EDID(dev, &edid, 128);
831         if (ACPI_FAILURE(status)) {
832                 status = acpi_video_device_EDID(dev, &edid, 256);
833         }
834
835         if (ACPI_FAILURE(status)) {
836                 goto out;
837         }
838
839         if (edid && edid->type == ACPI_TYPE_BUFFER) {
840                 for (i = 0; i < edid->buffer.length; i++)
841                         seq_putc(seq, edid->buffer.pointer[i]);
842         }
843
844       out:
845         if (!edid)
846                 seq_printf(seq, "<not supported>\n");
847         else
848                 kfree(edid);
849
850         return 0;
851 }
852
853 static int
854 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
855 {
856         return single_open(file, acpi_video_device_EDID_seq_show,
857                            PDE(inode)->data);
858 }
859
860 static int acpi_video_device_add_fs(struct acpi_device *device)
861 {
862         struct proc_dir_entry *entry = NULL;
863         struct acpi_video_device *vid_dev;
864
865
866         if (!device)
867                 return -ENODEV;
868
869         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
870         if (!vid_dev)
871                 return -ENODEV;
872
873         if (!acpi_device_dir(device)) {
874                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
875                                                      vid_dev->video->dir);
876                 if (!acpi_device_dir(device))
877                         return -ENODEV;
878                 acpi_device_dir(device)->owner = THIS_MODULE;
879         }
880
881         /* 'info' [R] */
882         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
883         if (!entry)
884                 return -ENODEV;
885         else {
886                 entry->proc_fops = &acpi_video_device_info_fops;
887                 entry->data = acpi_driver_data(device);
888                 entry->owner = THIS_MODULE;
889         }
890
891         /* 'state' [R/W] */
892         entry =
893             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
894                               acpi_device_dir(device));
895         if (!entry)
896                 return -ENODEV;
897         else {
898                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
899                 entry->proc_fops = &acpi_video_device_state_fops;
900                 entry->data = acpi_driver_data(device);
901                 entry->owner = THIS_MODULE;
902         }
903
904         /* 'brightness' [R/W] */
905         entry =
906             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
907                               acpi_device_dir(device));
908         if (!entry)
909                 return -ENODEV;
910         else {
911                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
912                 entry->proc_fops = &acpi_video_device_brightness_fops;
913                 entry->data = acpi_driver_data(device);
914                 entry->owner = THIS_MODULE;
915         }
916
917         /* 'EDID' [R] */
918         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
919         if (!entry)
920                 return -ENODEV;
921         else {
922                 entry->proc_fops = &acpi_video_device_EDID_fops;
923                 entry->data = acpi_driver_data(device);
924                 entry->owner = THIS_MODULE;
925         }
926
927         return 0;
928 }
929
930 static int acpi_video_device_remove_fs(struct acpi_device *device)
931 {
932         struct acpi_video_device *vid_dev;
933
934         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
935         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
936                 return -ENODEV;
937
938         if (acpi_device_dir(device)) {
939                 remove_proc_entry("info", acpi_device_dir(device));
940                 remove_proc_entry("state", acpi_device_dir(device));
941                 remove_proc_entry("brightness", acpi_device_dir(device));
942                 remove_proc_entry("EDID", acpi_device_dir(device));
943                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
944                 acpi_device_dir(device) = NULL;
945         }
946
947         return 0;
948 }
949
950 /* video bus */
951 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
952 {
953         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
954
955
956         if (!video)
957                 goto end;
958
959         seq_printf(seq, "Switching heads:              %s\n",
960                    video->flags.multihead ? "yes" : "no");
961         seq_printf(seq, "Video ROM:                    %s\n",
962                    video->flags.rom ? "yes" : "no");
963         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
964                    video->flags.post ? "yes" : "no");
965
966       end:
967         return 0;
968 }
969
970 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
971 {
972         return single_open(file, acpi_video_bus_info_seq_show,
973                            PDE(inode)->data);
974 }
975
976 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
977 {
978         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
979
980
981         if (!video)
982                 goto end;
983
984         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
985         seq_printf(seq, "<TODO>\n");
986
987       end:
988         return 0;
989 }
990
991 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
992 {
993         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
994 }
995
996 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
997 {
998         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
999         unsigned long options;
1000         int status;
1001
1002
1003         if (!video)
1004                 goto end;
1005
1006         status = acpi_video_bus_POST_options(video, &options);
1007         if (ACPI_SUCCESS(status)) {
1008                 if (!(options & 1)) {
1009                         printk(KERN_WARNING PREFIX
1010                                "The motherboard VGA device is not listed as a possible POST device.\n");
1011                         printk(KERN_WARNING PREFIX
1012                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1013                 }
1014                 printk("%lx\n", options);
1015                 seq_printf(seq, "can POST: <intgrated video>");
1016                 if (options & 2)
1017                         seq_printf(seq, " <PCI video>");
1018                 if (options & 4)
1019                         seq_printf(seq, " <AGP video>");
1020                 seq_putc(seq, '\n');
1021         } else
1022                 seq_printf(seq, "<not supported>\n");
1023       end:
1024         return 0;
1025 }
1026
1027 static int
1028 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1029 {
1030         return single_open(file, acpi_video_bus_POST_info_seq_show,
1031                            PDE(inode)->data);
1032 }
1033
1034 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1035 {
1036         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1037         int status;
1038         unsigned long id;
1039
1040
1041         if (!video)
1042                 goto end;
1043
1044         status = acpi_video_bus_get_POST(video, &id);
1045         if (!ACPI_SUCCESS(status)) {
1046                 seq_printf(seq, "<not supported>\n");
1047                 goto end;
1048         }
1049         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1050
1051       end:
1052         return 0;
1053 }
1054
1055 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1056 {
1057         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1058
1059
1060         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1061
1062         return 0;
1063 }
1064
1065 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1066 {
1067         return single_open(file, acpi_video_bus_POST_seq_show,
1068                            PDE(inode)->data);
1069 }
1070
1071 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1072 {
1073         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1074 }
1075
1076 static ssize_t
1077 acpi_video_bus_write_POST(struct file *file,
1078                           const char __user * buffer,
1079                           size_t count, loff_t * data)
1080 {
1081         int status;
1082         struct seq_file *m = (struct seq_file *)file->private_data;
1083         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1084         char str[12] = { 0 };
1085         unsigned long opt, options;
1086
1087
1088         if (!video || count + 1 > sizeof str)
1089                 return -EINVAL;
1090
1091         status = acpi_video_bus_POST_options(video, &options);
1092         if (!ACPI_SUCCESS(status))
1093                 return -EINVAL;
1094
1095         if (copy_from_user(str, buffer, count))
1096                 return -EFAULT;
1097
1098         str[count] = 0;
1099         opt = strtoul(str, NULL, 0);
1100         if (opt > 3)
1101                 return -EFAULT;
1102
1103         /* just in case an OEM 'forget' the motherboard... */
1104         options |= 1;
1105
1106         if (options & (1ul << opt)) {
1107                 status = acpi_video_bus_set_POST(video, opt);
1108                 if (!ACPI_SUCCESS(status))
1109                         return -EFAULT;
1110
1111         }
1112
1113         return count;
1114 }
1115
1116 static ssize_t
1117 acpi_video_bus_write_DOS(struct file *file,
1118                          const char __user * buffer,
1119                          size_t count, loff_t * data)
1120 {
1121         int status;
1122         struct seq_file *m = (struct seq_file *)file->private_data;
1123         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1124         char str[12] = { 0 };
1125         unsigned long opt;
1126
1127
1128         if (!video || count + 1 > sizeof str)
1129                 return -EINVAL;
1130
1131         if (copy_from_user(str, buffer, count))
1132                 return -EFAULT;
1133
1134         str[count] = 0;
1135         opt = strtoul(str, NULL, 0);
1136         if (opt > 7)
1137                 return -EFAULT;
1138
1139         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1140
1141         if (!ACPI_SUCCESS(status))
1142                 return -EFAULT;
1143
1144         return count;
1145 }
1146
1147 static int acpi_video_bus_add_fs(struct acpi_device *device)
1148 {
1149         struct proc_dir_entry *entry = NULL;
1150         struct acpi_video_bus *video;
1151
1152
1153         video = (struct acpi_video_bus *)acpi_driver_data(device);
1154
1155         if (!acpi_device_dir(device)) {
1156                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1157                                                      acpi_video_dir);
1158                 if (!acpi_device_dir(device))
1159                         return -ENODEV;
1160                 video->dir = acpi_device_dir(device);
1161                 acpi_device_dir(device)->owner = THIS_MODULE;
1162         }
1163
1164         /* 'info' [R] */
1165         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1166         if (!entry)
1167                 return -ENODEV;
1168         else {
1169                 entry->proc_fops = &acpi_video_bus_info_fops;
1170                 entry->data = acpi_driver_data(device);
1171                 entry->owner = THIS_MODULE;
1172         }
1173
1174         /* 'ROM' [R] */
1175         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1176         if (!entry)
1177                 return -ENODEV;
1178         else {
1179                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1180                 entry->data = acpi_driver_data(device);
1181                 entry->owner = THIS_MODULE;
1182         }
1183
1184         /* 'POST_info' [R] */
1185         entry =
1186             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1187         if (!entry)
1188                 return -ENODEV;
1189         else {
1190                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1191                 entry->data = acpi_driver_data(device);
1192                 entry->owner = THIS_MODULE;
1193         }
1194
1195         /* 'POST' [R/W] */
1196         entry =
1197             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1198                               acpi_device_dir(device));
1199         if (!entry)
1200                 return -ENODEV;
1201         else {
1202                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1203                 entry->proc_fops = &acpi_video_bus_POST_fops;
1204                 entry->data = acpi_driver_data(device);
1205                 entry->owner = THIS_MODULE;
1206         }
1207
1208         /* 'DOS' [R/W] */
1209         entry =
1210             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1211                               acpi_device_dir(device));
1212         if (!entry)
1213                 return -ENODEV;
1214         else {
1215                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1216                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1217                 entry->data = acpi_driver_data(device);
1218                 entry->owner = THIS_MODULE;
1219         }
1220
1221         return 0;
1222 }
1223
1224 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1225 {
1226         struct acpi_video_bus *video;
1227
1228
1229         video = (struct acpi_video_bus *)acpi_driver_data(device);
1230
1231         if (acpi_device_dir(device)) {
1232                 remove_proc_entry("info", acpi_device_dir(device));
1233                 remove_proc_entry("ROM", acpi_device_dir(device));
1234                 remove_proc_entry("POST_info", acpi_device_dir(device));
1235                 remove_proc_entry("POST", acpi_device_dir(device));
1236                 remove_proc_entry("DOS", acpi_device_dir(device));
1237                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1238                 acpi_device_dir(device) = NULL;
1239         }
1240
1241         return 0;
1242 }
1243
1244 /* --------------------------------------------------------------------------
1245                                  Driver Interface
1246    -------------------------------------------------------------------------- */
1247
1248 /* device interface */
1249
1250 static int
1251 acpi_video_bus_get_one_device(struct acpi_device *device,
1252                               struct acpi_video_bus *video)
1253 {
1254         unsigned long device_id;
1255         int status;
1256         struct acpi_video_device *data;
1257
1258
1259         if (!device || !video)
1260                 return -EINVAL;
1261
1262         status =
1263             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1264         if (ACPI_SUCCESS(status)) {
1265
1266                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1267                 if (!data)
1268                         return -ENOMEM;
1269
1270                 memset(data, 0, sizeof(struct acpi_video_device));
1271
1272                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1273                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1274                 acpi_driver_data(device) = data;
1275
1276                 data->device_id = device_id;
1277                 data->video = video;
1278                 data->dev = device;
1279
1280                 switch (device_id & 0xffff) {
1281                 case 0x0100:
1282                         data->flags.crt = 1;
1283                         break;
1284                 case 0x0400:
1285                         data->flags.lcd = 1;
1286                         break;
1287                 case 0x0200:
1288                         data->flags.tvout = 1;
1289                         break;
1290                 default:
1291                         data->flags.unknown = 1;
1292                         break;
1293                 }
1294
1295                 acpi_video_device_bind(video, data);
1296                 acpi_video_device_find_cap(data);
1297
1298                 status = acpi_install_notify_handler(device->handle,
1299                                                      ACPI_DEVICE_NOTIFY,
1300                                                      acpi_video_device_notify,
1301                                                      data);
1302                 if (ACPI_FAILURE(status)) {
1303                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1304                                           "Error installing notify handler\n"));
1305                         if(data->brightness)
1306                                 kfree(data->brightness->levels);
1307                         kfree(data->brightness);
1308                         kfree(data);
1309                         return -ENODEV;
1310                 }
1311
1312                 down(&video->sem);
1313                 list_add_tail(&data->entry, &video->video_device_list);
1314                 up(&video->sem);
1315
1316                 acpi_video_device_add_fs(device);
1317
1318                 return 0;
1319         }
1320
1321         return -ENOENT;
1322 }
1323
1324 /*
1325  *  Arg:
1326  *      video   : video bus device 
1327  *
1328  *  Return:
1329  *      none
1330  *  
1331  *  Enumerate the video device list of the video bus, 
1332  *  bind the ids with the corresponding video devices
1333  *  under the video bus.
1334  */
1335
1336 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1337 {
1338         struct list_head *node, *next;
1339         list_for_each_safe(node, next, &video->video_device_list) {
1340                 struct acpi_video_device *dev =
1341                     container_of(node, struct acpi_video_device, entry);
1342                 acpi_video_device_bind(video, dev);
1343         }
1344 }
1345
1346 /*
1347  *  Arg:
1348  *      video   : video bus device 
1349  *      device  : video output device under the video 
1350  *              bus
1351  *
1352  *  Return:
1353  *      none
1354  *  
1355  *  Bind the ids with the corresponding video devices
1356  *  under the video bus.
1357  */
1358
1359 static void
1360 acpi_video_device_bind(struct acpi_video_bus *video,
1361                        struct acpi_video_device *device)
1362 {
1363         int i;
1364
1365 #define IDS_VAL(i) video->attached_array[i].value.int_val
1366 #define IDS_BIND(i) video->attached_array[i].bind_info
1367
1368         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1369              i < video->attached_count; i++) {
1370                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1371                         IDS_BIND(i) = device;
1372                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1373                 }
1374         }
1375 #undef IDS_VAL
1376 #undef IDS_BIND
1377 }
1378
1379 /*
1380  *  Arg:
1381  *      video   : video bus device 
1382  *
1383  *  Return:
1384  *      < 0     : error
1385  *  
1386  *  Call _DOD to enumerate all devices attached to display adapter
1387  *
1388  */
1389
1390 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1391 {
1392         int status;
1393         int count;
1394         int i;
1395         struct acpi_video_enumerated_device *active_device_list;
1396         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1397         union acpi_object *dod = NULL;
1398         union acpi_object *obj;
1399
1400         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1401         if (!ACPI_SUCCESS(status)) {
1402                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1403                 return status;
1404         }
1405
1406         dod = (union acpi_object *)buffer.pointer;
1407         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1408                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1409                 status = -EFAULT;
1410                 goto out;
1411         }
1412
1413         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1414                           dod->package.count));
1415
1416         active_device_list = kmalloc((1 +
1417                                       dod->package.count) *
1418                                      sizeof(struct
1419                                             acpi_video_enumerated_device),
1420                                      GFP_KERNEL);
1421
1422         if (!active_device_list) {
1423                 status = -ENOMEM;
1424                 goto out;
1425         }
1426
1427         count = 0;
1428         for (i = 0; i < dod->package.count; i++) {
1429                 obj = (union acpi_object *)&dod->package.elements[i];
1430
1431                 if (obj->type != ACPI_TYPE_INTEGER) {
1432                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1433                         active_device_list[i].value.int_val =
1434                             ACPI_VIDEO_HEAD_INVALID;
1435                 }
1436                 active_device_list[i].value.int_val = obj->integer.value;
1437                 active_device_list[i].bind_info = NULL;
1438                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1439                                   (int)obj->integer.value));
1440                 count++;
1441         }
1442         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1443
1444         kfree(video->attached_array);
1445
1446         video->attached_array = active_device_list;
1447         video->attached_count = count;
1448       out:
1449         kfree(buffer.pointer);
1450         return status;
1451 }
1452
1453 /*
1454  *  Arg:
1455  *      video   : video bus device 
1456  *      event   : Nontify Event
1457  *
1458  *  Return:
1459  *      < 0     : error
1460  *  
1461  *      1. Find out the current active output device.
1462  *      2. Identify the next output device to switch
1463  *      3. call _DSS to do actual switch.
1464  */
1465
1466 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1467 {
1468         struct list_head *node, *next;
1469         struct acpi_video_device *dev = NULL;
1470         struct acpi_video_device *dev_next = NULL;
1471         struct acpi_video_device *dev_prev = NULL;
1472         unsigned long state;
1473         int status = 0;
1474
1475
1476         list_for_each_safe(node, next, &video->video_device_list) {
1477                 dev = container_of(node, struct acpi_video_device, entry);
1478                 status = acpi_video_device_get_state(dev, &state);
1479                 if (state & 0x2) {
1480                         dev_next =
1481                             container_of(node->next, struct acpi_video_device,
1482                                          entry);
1483                         dev_prev =
1484                             container_of(node->prev, struct acpi_video_device,
1485                                          entry);
1486                         goto out;
1487                 }
1488         }
1489         dev_next = container_of(node->next, struct acpi_video_device, entry);
1490         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1491       out:
1492         switch (event) {
1493         case ACPI_VIDEO_NOTIFY_CYCLE:
1494         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1495                 acpi_video_device_set_state(dev, 0);
1496                 acpi_video_device_set_state(dev_next, 0x80000001);
1497                 break;
1498         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1499                 acpi_video_device_set_state(dev, 0);
1500                 acpi_video_device_set_state(dev_prev, 0x80000001);
1501         default:
1502                 break;
1503         }
1504
1505         return status;
1506 }
1507
1508 static int
1509 acpi_video_get_next_level(struct acpi_video_device *device,
1510                           u32 level_current, u32 event)
1511 {
1512         /*Fix me */
1513         return level_current;
1514 }
1515
1516 static void
1517 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1518 {
1519         unsigned long level_current, level_next;
1520         acpi_video_device_lcd_get_level_current(device, &level_current);
1521         level_next = acpi_video_get_next_level(device, level_current, event);
1522         acpi_video_device_lcd_set_level(device, level_next);
1523 }
1524
1525 static int
1526 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1527                            struct acpi_device *device)
1528 {
1529         int status = 0;
1530         struct list_head *node, *next;
1531
1532
1533         acpi_video_device_enumerate(video);
1534
1535         list_for_each_safe(node, next, &device->children) {
1536                 struct acpi_device *dev =
1537                     list_entry(node, struct acpi_device, node);
1538
1539                 if (!dev)
1540                         continue;
1541
1542                 status = acpi_video_bus_get_one_device(dev, video);
1543                 if (ACPI_FAILURE(status)) {
1544                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1545                         continue;
1546                 }
1547
1548         }
1549         return status;
1550 }
1551
1552 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1553 {
1554         acpi_status status;
1555         struct acpi_video_bus *video;
1556
1557
1558         if (!device || !device->video)
1559                 return -ENOENT;
1560
1561         video = device->video;
1562
1563         down(&video->sem);
1564         list_del(&device->entry);
1565         up(&video->sem);
1566         acpi_video_device_remove_fs(device->dev);
1567
1568         status = acpi_remove_notify_handler(device->dev->handle,
1569                                             ACPI_DEVICE_NOTIFY,
1570                                             acpi_video_device_notify);
1571
1572         return 0;
1573 }
1574
1575 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1576 {
1577         int status;
1578         struct list_head *node, *next;
1579
1580
1581         list_for_each_safe(node, next, &video->video_device_list) {
1582                 struct acpi_video_device *data =
1583                     list_entry(node, struct acpi_video_device, entry);
1584                 if (!data)
1585                         continue;
1586
1587                 status = acpi_video_bus_put_one_device(data);
1588                 if (ACPI_FAILURE(status))
1589                         printk(KERN_WARNING PREFIX
1590                                "hhuuhhuu bug in acpi video driver.\n");
1591
1592                 if (data->brightness)
1593                         kfree(data->brightness->levels);
1594                 kfree(data->brightness);
1595                 kfree(data);
1596         }
1597
1598         return 0;
1599 }
1600
1601 /* acpi_video interface */
1602
1603 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1604 {
1605         return acpi_video_bus_DOS(video, 1, 0);
1606 }
1607
1608 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1609 {
1610         return acpi_video_bus_DOS(video, 0, 1);
1611 }
1612
1613 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1614 {
1615         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1616         struct acpi_device *device = NULL;
1617
1618         printk("video bus notify\n");
1619
1620         if (!video)
1621                 return;
1622
1623         device = video->device;
1624
1625         switch (event) {
1626         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1627                                          * most likely via hotkey. */
1628                 acpi_bus_generate_event(device, event, 0);
1629                 break;
1630
1631         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1632                                          * connector. */
1633                 acpi_video_device_enumerate(video);
1634                 acpi_video_device_rebind(video);
1635                 acpi_video_switch_output(video, event);
1636                 acpi_bus_generate_event(device, event, 0);
1637                 break;
1638
1639         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1640         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1641         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1642                 acpi_video_switch_output(video, event);
1643                 acpi_bus_generate_event(device, event, 0);
1644                 break;
1645
1646         default:
1647                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1648                                   "Unsupported event [0x%x]\n", event));
1649                 break;
1650         }
1651
1652         return;
1653 }
1654
1655 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1656 {
1657         struct acpi_video_device *video_device =
1658             (struct acpi_video_device *)data;
1659         struct acpi_device *device = NULL;
1660
1661
1662         printk("video device notify\n");
1663         if (!video_device)
1664                 return;
1665
1666         device = video_device->dev;
1667
1668         switch (event) {
1669         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1670         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1671                 acpi_bus_generate_event(device, event, 0);
1672                 break;
1673         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1674         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1675         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1676         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1677         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1678                 acpi_video_switch_brightness(video_device, event);
1679                 acpi_bus_generate_event(device, event, 0);
1680                 break;
1681         default:
1682                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1683                                   "Unsupported event [0x%x]\n", event));
1684                 break;
1685         }
1686         return;
1687 }
1688
1689 static int acpi_video_bus_add(struct acpi_device *device)
1690 {
1691         int result = 0;
1692         acpi_status status = 0;
1693         struct acpi_video_bus *video = NULL;
1694
1695
1696         if (!device)
1697                 return -EINVAL;
1698
1699         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1700         if (!video)
1701                 return -ENOMEM;
1702         memset(video, 0, sizeof(struct acpi_video_bus));
1703
1704         video->device = device;
1705         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1706         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1707         acpi_driver_data(device) = video;
1708
1709         acpi_video_bus_find_cap(video);
1710         result = acpi_video_bus_check(video);
1711         if (result)
1712                 goto end;
1713
1714         result = acpi_video_bus_add_fs(device);
1715         if (result)
1716                 goto end;
1717
1718         init_MUTEX(&video->sem);
1719         INIT_LIST_HEAD(&video->video_device_list);
1720
1721         acpi_video_bus_get_devices(video, device);
1722         acpi_video_bus_start_devices(video);
1723
1724         status = acpi_install_notify_handler(device->handle,
1725                                              ACPI_DEVICE_NOTIFY,
1726                                              acpi_video_bus_notify, video);
1727         if (ACPI_FAILURE(status)) {
1728                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1729                                   "Error installing notify handler\n"));
1730                 acpi_video_bus_stop_devices(video);
1731                 acpi_video_bus_put_devices(video);
1732                 kfree(video->attached_array);
1733                 acpi_video_bus_remove_fs(device);
1734                 result = -ENODEV;
1735                 goto end;
1736         }
1737
1738         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1739                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1740                video->flags.multihead ? "yes" : "no",
1741                video->flags.rom ? "yes" : "no",
1742                video->flags.post ? "yes" : "no");
1743
1744       end:
1745         if (result)
1746                 kfree(video);
1747
1748         return result;
1749 }
1750
1751 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1752 {
1753         acpi_status status = 0;
1754         struct acpi_video_bus *video = NULL;
1755
1756
1757         if (!device || !acpi_driver_data(device))
1758                 return -EINVAL;
1759
1760         video = (struct acpi_video_bus *)acpi_driver_data(device);
1761
1762         acpi_video_bus_stop_devices(video);
1763
1764         status = acpi_remove_notify_handler(video->device->handle,
1765                                             ACPI_DEVICE_NOTIFY,
1766                                             acpi_video_bus_notify);
1767
1768         acpi_video_bus_put_devices(video);
1769         acpi_video_bus_remove_fs(device);
1770
1771         kfree(video->attached_array);
1772         kfree(video);
1773
1774         return 0;
1775 }
1776
1777 static int
1778 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1779 {
1780         acpi_handle h_dummy1;
1781         acpi_handle h_dummy2;
1782         acpi_handle h_dummy3;
1783
1784
1785         if (!device || !driver)
1786                 return -EINVAL;
1787
1788         /* Since there is no HID, CID for ACPI Video drivers, we have
1789          * to check well known required nodes for each feature we support.
1790          */
1791
1792         /* Does this device able to support video switching ? */
1793         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1794             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1795                 return 0;
1796
1797         /* Does this device able to retrieve a video ROM ? */
1798         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1799                 return 0;
1800
1801         /* Does this device able to configure which video head to be POSTed ? */
1802         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1803             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1804             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1805                 return 0;
1806
1807         return -ENODEV;
1808 }
1809
1810 static int __init acpi_video_init(void)
1811 {
1812         int result = 0;
1813
1814
1815         /*
1816            acpi_dbg_level = 0xFFFFFFFF;
1817            acpi_dbg_layer = 0x08000000;
1818          */
1819
1820         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1821         if (!acpi_video_dir)
1822                 return -ENODEV;
1823         acpi_video_dir->owner = THIS_MODULE;
1824
1825         result = acpi_bus_register_driver(&acpi_video_bus);
1826         if (result < 0) {
1827                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1828                 return -ENODEV;
1829         }
1830
1831         return 0;
1832 }
1833
1834 static void __exit acpi_video_exit(void)
1835 {
1836
1837         acpi_bus_unregister_driver(&acpi_video_bus);
1838
1839         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1840
1841         return;
1842 }
1843
1844 module_init(acpi_video_init);
1845 module_exit(acpi_video_exit);