ACPI: Remove unnecessary from/to-void* and to-void casts in drivers/acpi
[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 = 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 = seq->private;
658
659
660         if (!dev)
661                 goto end;
662
663         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
664         seq_printf(seq, "type:         ");
665         if (dev->flags.crt)
666                 seq_printf(seq, "CRT\n");
667         else if (dev->flags.lcd)
668                 seq_printf(seq, "LCD\n");
669         else if (dev->flags.tvout)
670                 seq_printf(seq, "TVOUT\n");
671         else
672                 seq_printf(seq, "UNKNOWN\n");
673
674         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
675
676       end:
677         return 0;
678 }
679
680 static int
681 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
682 {
683         return single_open(file, acpi_video_device_info_seq_show,
684                            PDE(inode)->data);
685 }
686
687 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
688 {
689         int status;
690         struct acpi_video_device *dev = seq->private;
691         unsigned long state;
692
693
694         if (!dev)
695                 goto end;
696
697         status = acpi_video_device_get_state(dev, &state);
698         seq_printf(seq, "state:     ");
699         if (ACPI_SUCCESS(status))
700                 seq_printf(seq, "0x%02lx\n", state);
701         else
702                 seq_printf(seq, "<not supported>\n");
703
704         status = acpi_video_device_query(dev, &state);
705         seq_printf(seq, "query:     ");
706         if (ACPI_SUCCESS(status))
707                 seq_printf(seq, "0x%02lx\n", state);
708         else
709                 seq_printf(seq, "<not supported>\n");
710
711       end:
712         return 0;
713 }
714
715 static int
716 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
717 {
718         return single_open(file, acpi_video_device_state_seq_show,
719                            PDE(inode)->data);
720 }
721
722 static ssize_t
723 acpi_video_device_write_state(struct file *file,
724                               const char __user * buffer,
725                               size_t count, loff_t * data)
726 {
727         int status;
728         struct seq_file *m = file->private_data;
729         struct acpi_video_device *dev = m->private;
730         char str[12] = { 0 };
731         u32 state = 0;
732
733
734         if (!dev || count + 1 > sizeof str)
735                 return -EINVAL;
736
737         if (copy_from_user(str, buffer, count))
738                 return -EFAULT;
739
740         str[count] = 0;
741         state = simple_strtoul(str, NULL, 0);
742         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
743
744         status = acpi_video_device_set_state(dev, state);
745
746         if (status)
747                 return -EFAULT;
748
749         return count;
750 }
751
752 static int
753 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
754 {
755         struct acpi_video_device *dev = seq->private;
756         int i;
757
758
759         if (!dev || !dev->brightness) {
760                 seq_printf(seq, "<not supported>\n");
761                 return 0;
762         }
763
764         seq_printf(seq, "levels: ");
765         for (i = 0; i < dev->brightness->count; i++)
766                 seq_printf(seq, " %d", dev->brightness->levels[i]);
767         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
768
769         return 0;
770 }
771
772 static int
773 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
774 {
775         return single_open(file, acpi_video_device_brightness_seq_show,
776                            PDE(inode)->data);
777 }
778
779 static ssize_t
780 acpi_video_device_write_brightness(struct file *file,
781                                    const char __user * buffer,
782                                    size_t count, loff_t * data)
783 {
784         struct seq_file *m = file->private_data;
785         struct acpi_video_device *dev = m->private;
786         char str[4] = { 0 };
787         unsigned int level = 0;
788         int i;
789
790
791         if (!dev || !dev->brightness || count + 1 > sizeof str)
792                 return -EINVAL;
793
794         if (copy_from_user(str, buffer, count))
795                 return -EFAULT;
796
797         str[count] = 0;
798         level = simple_strtoul(str, NULL, 0);
799
800         if (level > 100)
801                 return -EFAULT;
802
803         /* validate though the list of available levels */
804         for (i = 0; i < dev->brightness->count; i++)
805                 if (level == dev->brightness->levels[i]) {
806                         if (ACPI_SUCCESS
807                             (acpi_video_device_lcd_set_level(dev, level)))
808                                 dev->brightness->curr = level;
809                         break;
810                 }
811
812         return count;
813 }
814
815 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
816 {
817         struct acpi_video_device *dev = seq->private;
818         int status;
819         int i;
820         union acpi_object *edid = NULL;
821
822
823         if (!dev)
824                 goto out;
825
826         status = acpi_video_device_EDID(dev, &edid, 128);
827         if (ACPI_FAILURE(status)) {
828                 status = acpi_video_device_EDID(dev, &edid, 256);
829         }
830
831         if (ACPI_FAILURE(status)) {
832                 goto out;
833         }
834
835         if (edid && edid->type == ACPI_TYPE_BUFFER) {
836                 for (i = 0; i < edid->buffer.length; i++)
837                         seq_putc(seq, edid->buffer.pointer[i]);
838         }
839
840       out:
841         if (!edid)
842                 seq_printf(seq, "<not supported>\n");
843         else
844                 kfree(edid);
845
846         return 0;
847 }
848
849 static int
850 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
851 {
852         return single_open(file, acpi_video_device_EDID_seq_show,
853                            PDE(inode)->data);
854 }
855
856 static int acpi_video_device_add_fs(struct acpi_device *device)
857 {
858         struct proc_dir_entry *entry = NULL;
859         struct acpi_video_device *vid_dev;
860
861
862         if (!device)
863                 return -ENODEV;
864
865         vid_dev = acpi_driver_data(device);
866         if (!vid_dev)
867                 return -ENODEV;
868
869         if (!acpi_device_dir(device)) {
870                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
871                                                      vid_dev->video->dir);
872                 if (!acpi_device_dir(device))
873                         return -ENODEV;
874                 acpi_device_dir(device)->owner = THIS_MODULE;
875         }
876
877         /* 'info' [R] */
878         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
879         if (!entry)
880                 return -ENODEV;
881         else {
882                 entry->proc_fops = &acpi_video_device_info_fops;
883                 entry->data = acpi_driver_data(device);
884                 entry->owner = THIS_MODULE;
885         }
886
887         /* 'state' [R/W] */
888         entry =
889             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
890                               acpi_device_dir(device));
891         if (!entry)
892                 return -ENODEV;
893         else {
894                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
895                 entry->proc_fops = &acpi_video_device_state_fops;
896                 entry->data = acpi_driver_data(device);
897                 entry->owner = THIS_MODULE;
898         }
899
900         /* 'brightness' [R/W] */
901         entry =
902             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
903                               acpi_device_dir(device));
904         if (!entry)
905                 return -ENODEV;
906         else {
907                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
908                 entry->proc_fops = &acpi_video_device_brightness_fops;
909                 entry->data = acpi_driver_data(device);
910                 entry->owner = THIS_MODULE;
911         }
912
913         /* 'EDID' [R] */
914         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
915         if (!entry)
916                 return -ENODEV;
917         else {
918                 entry->proc_fops = &acpi_video_device_EDID_fops;
919                 entry->data = acpi_driver_data(device);
920                 entry->owner = THIS_MODULE;
921         }
922
923         return 0;
924 }
925
926 static int acpi_video_device_remove_fs(struct acpi_device *device)
927 {
928         struct acpi_video_device *vid_dev;
929
930         vid_dev = acpi_driver_data(device);
931         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
932                 return -ENODEV;
933
934         if (acpi_device_dir(device)) {
935                 remove_proc_entry("info", acpi_device_dir(device));
936                 remove_proc_entry("state", acpi_device_dir(device));
937                 remove_proc_entry("brightness", acpi_device_dir(device));
938                 remove_proc_entry("EDID", acpi_device_dir(device));
939                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
940                 acpi_device_dir(device) = NULL;
941         }
942
943         return 0;
944 }
945
946 /* video bus */
947 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
948 {
949         struct acpi_video_bus *video = seq->private;
950
951
952         if (!video)
953                 goto end;
954
955         seq_printf(seq, "Switching heads:              %s\n",
956                    video->flags.multihead ? "yes" : "no");
957         seq_printf(seq, "Video ROM:                    %s\n",
958                    video->flags.rom ? "yes" : "no");
959         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
960                    video->flags.post ? "yes" : "no");
961
962       end:
963         return 0;
964 }
965
966 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
967 {
968         return single_open(file, acpi_video_bus_info_seq_show,
969                            PDE(inode)->data);
970 }
971
972 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
973 {
974         struct acpi_video_bus *video = seq->private;
975
976
977         if (!video)
978                 goto end;
979
980         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
981         seq_printf(seq, "<TODO>\n");
982
983       end:
984         return 0;
985 }
986
987 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
988 {
989         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
990 }
991
992 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
993 {
994         struct acpi_video_bus *video = seq->private;
995         unsigned long options;
996         int status;
997
998
999         if (!video)
1000                 goto end;
1001
1002         status = acpi_video_bus_POST_options(video, &options);
1003         if (ACPI_SUCCESS(status)) {
1004                 if (!(options & 1)) {
1005                         printk(KERN_WARNING PREFIX
1006                                "The motherboard VGA device is not listed as a possible POST device.\n");
1007                         printk(KERN_WARNING PREFIX
1008                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1009                 }
1010                 printk("%lx\n", options);
1011                 seq_printf(seq, "can POST: <intgrated video>");
1012                 if (options & 2)
1013                         seq_printf(seq, " <PCI video>");
1014                 if (options & 4)
1015                         seq_printf(seq, " <AGP video>");
1016                 seq_putc(seq, '\n');
1017         } else
1018                 seq_printf(seq, "<not supported>\n");
1019       end:
1020         return 0;
1021 }
1022
1023 static int
1024 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1025 {
1026         return single_open(file, acpi_video_bus_POST_info_seq_show,
1027                            PDE(inode)->data);
1028 }
1029
1030 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1031 {
1032         struct acpi_video_bus *video = seq->private;
1033         int status;
1034         unsigned long id;
1035
1036
1037         if (!video)
1038                 goto end;
1039
1040         status = acpi_video_bus_get_POST(video, &id);
1041         if (!ACPI_SUCCESS(status)) {
1042                 seq_printf(seq, "<not supported>\n");
1043                 goto end;
1044         }
1045         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1046
1047       end:
1048         return 0;
1049 }
1050
1051 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1052 {
1053         struct acpi_video_bus *video = seq->private;
1054
1055
1056         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1057
1058         return 0;
1059 }
1060
1061 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1062 {
1063         return single_open(file, acpi_video_bus_POST_seq_show,
1064                            PDE(inode)->data);
1065 }
1066
1067 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1068 {
1069         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1070 }
1071
1072 static ssize_t
1073 acpi_video_bus_write_POST(struct file *file,
1074                           const char __user * buffer,
1075                           size_t count, loff_t * data)
1076 {
1077         int status;
1078         struct seq_file *m = file->private_data;
1079         struct acpi_video_bus *video = m->private;
1080         char str[12] = { 0 };
1081         unsigned long opt, options;
1082
1083
1084         if (!video || count + 1 > sizeof str)
1085                 return -EINVAL;
1086
1087         status = acpi_video_bus_POST_options(video, &options);
1088         if (!ACPI_SUCCESS(status))
1089                 return -EINVAL;
1090
1091         if (copy_from_user(str, buffer, count))
1092                 return -EFAULT;
1093
1094         str[count] = 0;
1095         opt = strtoul(str, NULL, 0);
1096         if (opt > 3)
1097                 return -EFAULT;
1098
1099         /* just in case an OEM 'forget' the motherboard... */
1100         options |= 1;
1101
1102         if (options & (1ul << opt)) {
1103                 status = acpi_video_bus_set_POST(video, opt);
1104                 if (!ACPI_SUCCESS(status))
1105                         return -EFAULT;
1106
1107         }
1108
1109         return count;
1110 }
1111
1112 static ssize_t
1113 acpi_video_bus_write_DOS(struct file *file,
1114                          const char __user * buffer,
1115                          size_t count, loff_t * data)
1116 {
1117         int status;
1118         struct seq_file *m = file->private_data;
1119         struct acpi_video_bus *video = m->private;
1120         char str[12] = { 0 };
1121         unsigned long opt;
1122
1123
1124         if (!video || count + 1 > sizeof str)
1125                 return -EINVAL;
1126
1127         if (copy_from_user(str, buffer, count))
1128                 return -EFAULT;
1129
1130         str[count] = 0;
1131         opt = strtoul(str, NULL, 0);
1132         if (opt > 7)
1133                 return -EFAULT;
1134
1135         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1136
1137         if (!ACPI_SUCCESS(status))
1138                 return -EFAULT;
1139
1140         return count;
1141 }
1142
1143 static int acpi_video_bus_add_fs(struct acpi_device *device)
1144 {
1145         struct proc_dir_entry *entry = NULL;
1146         struct acpi_video_bus *video;
1147
1148
1149         video = acpi_driver_data(device);
1150
1151         if (!acpi_device_dir(device)) {
1152                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1153                                                      acpi_video_dir);
1154                 if (!acpi_device_dir(device))
1155                         return -ENODEV;
1156                 video->dir = acpi_device_dir(device);
1157                 acpi_device_dir(device)->owner = THIS_MODULE;
1158         }
1159
1160         /* 'info' [R] */
1161         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1162         if (!entry)
1163                 return -ENODEV;
1164         else {
1165                 entry->proc_fops = &acpi_video_bus_info_fops;
1166                 entry->data = acpi_driver_data(device);
1167                 entry->owner = THIS_MODULE;
1168         }
1169
1170         /* 'ROM' [R] */
1171         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1172         if (!entry)
1173                 return -ENODEV;
1174         else {
1175                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1176                 entry->data = acpi_driver_data(device);
1177                 entry->owner = THIS_MODULE;
1178         }
1179
1180         /* 'POST_info' [R] */
1181         entry =
1182             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1183         if (!entry)
1184                 return -ENODEV;
1185         else {
1186                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1187                 entry->data = acpi_driver_data(device);
1188                 entry->owner = THIS_MODULE;
1189         }
1190
1191         /* 'POST' [R/W] */
1192         entry =
1193             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1194                               acpi_device_dir(device));
1195         if (!entry)
1196                 return -ENODEV;
1197         else {
1198                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1199                 entry->proc_fops = &acpi_video_bus_POST_fops;
1200                 entry->data = acpi_driver_data(device);
1201                 entry->owner = THIS_MODULE;
1202         }
1203
1204         /* 'DOS' [R/W] */
1205         entry =
1206             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1207                               acpi_device_dir(device));
1208         if (!entry)
1209                 return -ENODEV;
1210         else {
1211                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1212                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1213                 entry->data = acpi_driver_data(device);
1214                 entry->owner = THIS_MODULE;
1215         }
1216
1217         return 0;
1218 }
1219
1220 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1221 {
1222         struct acpi_video_bus *video;
1223
1224
1225         video = acpi_driver_data(device);
1226
1227         if (acpi_device_dir(device)) {
1228                 remove_proc_entry("info", acpi_device_dir(device));
1229                 remove_proc_entry("ROM", acpi_device_dir(device));
1230                 remove_proc_entry("POST_info", acpi_device_dir(device));
1231                 remove_proc_entry("POST", acpi_device_dir(device));
1232                 remove_proc_entry("DOS", acpi_device_dir(device));
1233                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1234                 acpi_device_dir(device) = NULL;
1235         }
1236
1237         return 0;
1238 }
1239
1240 /* --------------------------------------------------------------------------
1241                                  Driver Interface
1242    -------------------------------------------------------------------------- */
1243
1244 /* device interface */
1245
1246 static int
1247 acpi_video_bus_get_one_device(struct acpi_device *device,
1248                               struct acpi_video_bus *video)
1249 {
1250         unsigned long device_id;
1251         int status;
1252         struct acpi_video_device *data;
1253
1254
1255         if (!device || !video)
1256                 return -EINVAL;
1257
1258         status =
1259             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1260         if (ACPI_SUCCESS(status)) {
1261
1262                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1263                 if (!data)
1264                         return -ENOMEM;
1265
1266                 memset(data, 0, sizeof(struct acpi_video_device));
1267
1268                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1269                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1270                 acpi_driver_data(device) = data;
1271
1272                 data->device_id = device_id;
1273                 data->video = video;
1274                 data->dev = device;
1275
1276                 switch (device_id & 0xffff) {
1277                 case 0x0100:
1278                         data->flags.crt = 1;
1279                         break;
1280                 case 0x0400:
1281                         data->flags.lcd = 1;
1282                         break;
1283                 case 0x0200:
1284                         data->flags.tvout = 1;
1285                         break;
1286                 default:
1287                         data->flags.unknown = 1;
1288                         break;
1289                 }
1290
1291                 acpi_video_device_bind(video, data);
1292                 acpi_video_device_find_cap(data);
1293
1294                 status = acpi_install_notify_handler(device->handle,
1295                                                      ACPI_DEVICE_NOTIFY,
1296                                                      acpi_video_device_notify,
1297                                                      data);
1298                 if (ACPI_FAILURE(status)) {
1299                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1300                                           "Error installing notify handler\n"));
1301                         if(data->brightness)
1302                                 kfree(data->brightness->levels);
1303                         kfree(data->brightness);
1304                         kfree(data);
1305                         return -ENODEV;
1306                 }
1307
1308                 down(&video->sem);
1309                 list_add_tail(&data->entry, &video->video_device_list);
1310                 up(&video->sem);
1311
1312                 acpi_video_device_add_fs(device);
1313
1314                 return 0;
1315         }
1316
1317         return -ENOENT;
1318 }
1319
1320 /*
1321  *  Arg:
1322  *      video   : video bus device 
1323  *
1324  *  Return:
1325  *      none
1326  *  
1327  *  Enumerate the video device list of the video bus, 
1328  *  bind the ids with the corresponding video devices
1329  *  under the video bus.
1330  */
1331
1332 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1333 {
1334         struct list_head *node, *next;
1335         list_for_each_safe(node, next, &video->video_device_list) {
1336                 struct acpi_video_device *dev =
1337                     container_of(node, struct acpi_video_device, entry);
1338                 acpi_video_device_bind(video, dev);
1339         }
1340 }
1341
1342 /*
1343  *  Arg:
1344  *      video   : video bus device 
1345  *      device  : video output device under the video 
1346  *              bus
1347  *
1348  *  Return:
1349  *      none
1350  *  
1351  *  Bind the ids with the corresponding video devices
1352  *  under the video bus.
1353  */
1354
1355 static void
1356 acpi_video_device_bind(struct acpi_video_bus *video,
1357                        struct acpi_video_device *device)
1358 {
1359         int i;
1360
1361 #define IDS_VAL(i) video->attached_array[i].value.int_val
1362 #define IDS_BIND(i) video->attached_array[i].bind_info
1363
1364         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1365              i < video->attached_count; i++) {
1366                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1367                         IDS_BIND(i) = device;
1368                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1369                 }
1370         }
1371 #undef IDS_VAL
1372 #undef IDS_BIND
1373 }
1374
1375 /*
1376  *  Arg:
1377  *      video   : video bus device 
1378  *
1379  *  Return:
1380  *      < 0     : error
1381  *  
1382  *  Call _DOD to enumerate all devices attached to display adapter
1383  *
1384  */
1385
1386 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1387 {
1388         int status;
1389         int count;
1390         int i;
1391         struct acpi_video_enumerated_device *active_device_list;
1392         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1393         union acpi_object *dod = NULL;
1394         union acpi_object *obj;
1395
1396         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1397         if (!ACPI_SUCCESS(status)) {
1398                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1399                 return status;
1400         }
1401
1402         dod = buffer.pointer;
1403         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1404                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1405                 status = -EFAULT;
1406                 goto out;
1407         }
1408
1409         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1410                           dod->package.count));
1411
1412         active_device_list = kmalloc((1 +
1413                                       dod->package.count) *
1414                                      sizeof(struct
1415                                             acpi_video_enumerated_device),
1416                                      GFP_KERNEL);
1417
1418         if (!active_device_list) {
1419                 status = -ENOMEM;
1420                 goto out;
1421         }
1422
1423         count = 0;
1424         for (i = 0; i < dod->package.count; i++) {
1425                 obj = &dod->package.elements[i];
1426
1427                 if (obj->type != ACPI_TYPE_INTEGER) {
1428                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1429                         active_device_list[i].value.int_val =
1430                             ACPI_VIDEO_HEAD_INVALID;
1431                 }
1432                 active_device_list[i].value.int_val = obj->integer.value;
1433                 active_device_list[i].bind_info = NULL;
1434                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1435                                   (int)obj->integer.value));
1436                 count++;
1437         }
1438         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1439
1440         kfree(video->attached_array);
1441
1442         video->attached_array = active_device_list;
1443         video->attached_count = count;
1444       out:
1445         kfree(buffer.pointer);
1446         return status;
1447 }
1448
1449 /*
1450  *  Arg:
1451  *      video   : video bus device 
1452  *      event   : Nontify Event
1453  *
1454  *  Return:
1455  *      < 0     : error
1456  *  
1457  *      1. Find out the current active output device.
1458  *      2. Identify the next output device to switch
1459  *      3. call _DSS to do actual switch.
1460  */
1461
1462 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1463 {
1464         struct list_head *node, *next;
1465         struct acpi_video_device *dev = NULL;
1466         struct acpi_video_device *dev_next = NULL;
1467         struct acpi_video_device *dev_prev = NULL;
1468         unsigned long state;
1469         int status = 0;
1470
1471
1472         list_for_each_safe(node, next, &video->video_device_list) {
1473                 dev = container_of(node, struct acpi_video_device, entry);
1474                 status = acpi_video_device_get_state(dev, &state);
1475                 if (state & 0x2) {
1476                         dev_next =
1477                             container_of(node->next, struct acpi_video_device,
1478                                          entry);
1479                         dev_prev =
1480                             container_of(node->prev, struct acpi_video_device,
1481                                          entry);
1482                         goto out;
1483                 }
1484         }
1485         dev_next = container_of(node->next, struct acpi_video_device, entry);
1486         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1487       out:
1488         switch (event) {
1489         case ACPI_VIDEO_NOTIFY_CYCLE:
1490         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1491                 acpi_video_device_set_state(dev, 0);
1492                 acpi_video_device_set_state(dev_next, 0x80000001);
1493                 break;
1494         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1495                 acpi_video_device_set_state(dev, 0);
1496                 acpi_video_device_set_state(dev_prev, 0x80000001);
1497         default:
1498                 break;
1499         }
1500
1501         return status;
1502 }
1503
1504 static int
1505 acpi_video_get_next_level(struct acpi_video_device *device,
1506                           u32 level_current, u32 event)
1507 {
1508         /*Fix me */
1509         return level_current;
1510 }
1511
1512 static void
1513 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1514 {
1515         unsigned long level_current, level_next;
1516         acpi_video_device_lcd_get_level_current(device, &level_current);
1517         level_next = acpi_video_get_next_level(device, level_current, event);
1518         acpi_video_device_lcd_set_level(device, level_next);
1519 }
1520
1521 static int
1522 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1523                            struct acpi_device *device)
1524 {
1525         int status = 0;
1526         struct list_head *node, *next;
1527
1528
1529         acpi_video_device_enumerate(video);
1530
1531         list_for_each_safe(node, next, &device->children) {
1532                 struct acpi_device *dev =
1533                     list_entry(node, struct acpi_device, node);
1534
1535                 if (!dev)
1536                         continue;
1537
1538                 status = acpi_video_bus_get_one_device(dev, video);
1539                 if (ACPI_FAILURE(status)) {
1540                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1541                         continue;
1542                 }
1543
1544         }
1545         return status;
1546 }
1547
1548 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1549 {
1550         acpi_status status;
1551         struct acpi_video_bus *video;
1552
1553
1554         if (!device || !device->video)
1555                 return -ENOENT;
1556
1557         video = device->video;
1558
1559         down(&video->sem);
1560         list_del(&device->entry);
1561         up(&video->sem);
1562         acpi_video_device_remove_fs(device->dev);
1563
1564         status = acpi_remove_notify_handler(device->dev->handle,
1565                                             ACPI_DEVICE_NOTIFY,
1566                                             acpi_video_device_notify);
1567
1568         return 0;
1569 }
1570
1571 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1572 {
1573         int status;
1574         struct list_head *node, *next;
1575
1576
1577         list_for_each_safe(node, next, &video->video_device_list) {
1578                 struct acpi_video_device *data =
1579                     list_entry(node, struct acpi_video_device, entry);
1580                 if (!data)
1581                         continue;
1582
1583                 status = acpi_video_bus_put_one_device(data);
1584                 if (ACPI_FAILURE(status))
1585                         printk(KERN_WARNING PREFIX
1586                                "hhuuhhuu bug in acpi video driver.\n");
1587
1588                 if (data->brightness)
1589                         kfree(data->brightness->levels);
1590                 kfree(data->brightness);
1591                 kfree(data);
1592         }
1593
1594         return 0;
1595 }
1596
1597 /* acpi_video interface */
1598
1599 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1600 {
1601         return acpi_video_bus_DOS(video, 1, 0);
1602 }
1603
1604 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1605 {
1606         return acpi_video_bus_DOS(video, 0, 1);
1607 }
1608
1609 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1610 {
1611         struct acpi_video_bus *video = data;
1612         struct acpi_device *device = NULL;
1613
1614         printk("video bus notify\n");
1615
1616         if (!video)
1617                 return;
1618
1619         device = video->device;
1620
1621         switch (event) {
1622         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1623                                          * most likely via hotkey. */
1624                 acpi_bus_generate_event(device, event, 0);
1625                 break;
1626
1627         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1628                                          * connector. */
1629                 acpi_video_device_enumerate(video);
1630                 acpi_video_device_rebind(video);
1631                 acpi_video_switch_output(video, event);
1632                 acpi_bus_generate_event(device, event, 0);
1633                 break;
1634
1635         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1636         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1637         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1638                 acpi_video_switch_output(video, event);
1639                 acpi_bus_generate_event(device, event, 0);
1640                 break;
1641
1642         default:
1643                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1644                                   "Unsupported event [0x%x]\n", event));
1645                 break;
1646         }
1647
1648         return;
1649 }
1650
1651 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1652 {
1653         struct acpi_video_device *video_device = data;
1654         struct acpi_device *device = NULL;
1655
1656
1657         printk("video device notify\n");
1658         if (!video_device)
1659                 return;
1660
1661         device = video_device->dev;
1662
1663         switch (event) {
1664         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1665         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1666                 acpi_bus_generate_event(device, event, 0);
1667                 break;
1668         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1669         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1670         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1671         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1672         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1673                 acpi_video_switch_brightness(video_device, event);
1674                 acpi_bus_generate_event(device, event, 0);
1675                 break;
1676         default:
1677                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1678                                   "Unsupported event [0x%x]\n", event));
1679                 break;
1680         }
1681         return;
1682 }
1683
1684 static int acpi_video_bus_add(struct acpi_device *device)
1685 {
1686         int result = 0;
1687         acpi_status status = 0;
1688         struct acpi_video_bus *video = NULL;
1689
1690
1691         if (!device)
1692                 return -EINVAL;
1693
1694         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1695         if (!video)
1696                 return -ENOMEM;
1697         memset(video, 0, sizeof(struct acpi_video_bus));
1698
1699         video->device = device;
1700         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1701         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1702         acpi_driver_data(device) = video;
1703
1704         acpi_video_bus_find_cap(video);
1705         result = acpi_video_bus_check(video);
1706         if (result)
1707                 goto end;
1708
1709         result = acpi_video_bus_add_fs(device);
1710         if (result)
1711                 goto end;
1712
1713         init_MUTEX(&video->sem);
1714         INIT_LIST_HEAD(&video->video_device_list);
1715
1716         acpi_video_bus_get_devices(video, device);
1717         acpi_video_bus_start_devices(video);
1718
1719         status = acpi_install_notify_handler(device->handle,
1720                                              ACPI_DEVICE_NOTIFY,
1721                                              acpi_video_bus_notify, video);
1722         if (ACPI_FAILURE(status)) {
1723                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1724                                   "Error installing notify handler\n"));
1725                 acpi_video_bus_stop_devices(video);
1726                 acpi_video_bus_put_devices(video);
1727                 kfree(video->attached_array);
1728                 acpi_video_bus_remove_fs(device);
1729                 result = -ENODEV;
1730                 goto end;
1731         }
1732
1733         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1734                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1735                video->flags.multihead ? "yes" : "no",
1736                video->flags.rom ? "yes" : "no",
1737                video->flags.post ? "yes" : "no");
1738
1739       end:
1740         if (result)
1741                 kfree(video);
1742
1743         return result;
1744 }
1745
1746 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1747 {
1748         acpi_status status = 0;
1749         struct acpi_video_bus *video = NULL;
1750
1751
1752         if (!device || !acpi_driver_data(device))
1753                 return -EINVAL;
1754
1755         video = acpi_driver_data(device);
1756
1757         acpi_video_bus_stop_devices(video);
1758
1759         status = acpi_remove_notify_handler(video->device->handle,
1760                                             ACPI_DEVICE_NOTIFY,
1761                                             acpi_video_bus_notify);
1762
1763         acpi_video_bus_put_devices(video);
1764         acpi_video_bus_remove_fs(device);
1765
1766         kfree(video->attached_array);
1767         kfree(video);
1768
1769         return 0;
1770 }
1771
1772 static int
1773 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1774 {
1775         acpi_handle h_dummy1;
1776         acpi_handle h_dummy2;
1777         acpi_handle h_dummy3;
1778
1779
1780         if (!device || !driver)
1781                 return -EINVAL;
1782
1783         /* Since there is no HID, CID for ACPI Video drivers, we have
1784          * to check well known required nodes for each feature we support.
1785          */
1786
1787         /* Does this device able to support video switching ? */
1788         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1789             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1790                 return 0;
1791
1792         /* Does this device able to retrieve a video ROM ? */
1793         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1794                 return 0;
1795
1796         /* Does this device able to configure which video head to be POSTed ? */
1797         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1798             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1799             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1800                 return 0;
1801
1802         return -ENODEV;
1803 }
1804
1805 static int __init acpi_video_init(void)
1806 {
1807         int result = 0;
1808
1809
1810         /*
1811            acpi_dbg_level = 0xFFFFFFFF;
1812            acpi_dbg_layer = 0x08000000;
1813          */
1814
1815         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1816         if (!acpi_video_dir)
1817                 return -ENODEV;
1818         acpi_video_dir->owner = THIS_MODULE;
1819
1820         result = acpi_bus_register_driver(&acpi_video_bus);
1821         if (result < 0) {
1822                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1823                 return -ENODEV;
1824         }
1825
1826         return 0;
1827 }
1828
1829 static void __exit acpi_video_exit(void)
1830 {
1831
1832         acpi_bus_unregister_driver(&acpi_video_bus);
1833
1834         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1835
1836         return;
1837 }
1838
1839 module_init(acpi_video_init);
1840 module_exit(acpi_video_exit);