drm: DRM: fix memset size error
[linux-2.6.git] / drivers / acpi / video.c
1 /*
2  *  video.c - ACPI Video Driver ($Revision:$)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or (at
13  *  your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  *  General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/input.h>
35 #include <linux/backlight.h>
36 #include <linux/video_output.h>
37 #include <asm/uaccess.h>
38
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41
42 #define ACPI_VIDEO_COMPONENT            0x08000000
43 #define ACPI_VIDEO_CLASS                "video"
44 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
46 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
47 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
48 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
51
52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
57
58 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
59 #define ACPI_VIDEO_HEAD_END             (~0u)
60 #define MAX_NAME_LEN    20
61
62 #define ACPI_VIDEO_DISPLAY_CRT  1
63 #define ACPI_VIDEO_DISPLAY_TV   2
64 #define ACPI_VIDEO_DISPLAY_DVI  3
65 #define ACPI_VIDEO_DISPLAY_LCD  4
66
67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
69
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
73
74 static int acpi_video_bus_add(struct acpi_device *device);
75 static int acpi_video_bus_remove(struct acpi_device *device, int type);
76
77 static const struct acpi_device_id video_device_ids[] = {
78         {ACPI_VIDEO_HID, 0},
79         {"", 0},
80 };
81 MODULE_DEVICE_TABLE(acpi, video_device_ids);
82
83 static struct acpi_driver acpi_video_bus = {
84         .name = "video",
85         .class = ACPI_VIDEO_CLASS,
86         .ids = video_device_ids,
87         .ops = {
88                 .add = acpi_video_bus_add,
89                 .remove = acpi_video_bus_remove,
90                 },
91 };
92
93 struct acpi_video_bus_flags {
94         u8 multihead:1;         /* can switch video heads */
95         u8 rom:1;               /* can retrieve a video rom */
96         u8 post:1;              /* can configure the head to */
97         u8 reserved:5;
98 };
99
100 struct acpi_video_bus_cap {
101         u8 _DOS:1;              /*Enable/Disable output switching */
102         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
103         u8 _ROM:1;              /*Get ROM Data */
104         u8 _GPD:1;              /*Get POST Device */
105         u8 _SPD:1;              /*Set POST Device */
106         u8 _VPO:1;              /*Video POST Options */
107         u8 reserved:2;
108 };
109
110 struct acpi_video_device_attrib {
111         u32 display_index:4;    /* A zero-based instance of the Display */
112         u32 display_port_attachment:4;  /*This field differentiates the display type */
113         u32 display_type:4;     /*Describe the specific type in use */
114         u32 vendor_specific:4;  /*Chipset Vendor Specific */
115         u32 bios_can_detect:1;  /*BIOS can detect the device */
116         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
117                                    the VGA device. */
118         u32 pipe_id:3;          /*For VGA multiple-head devices. */
119         u32 reserved:10;        /*Must be 0 */
120         u32 device_id_scheme:1; /*Device ID Scheme */
121 };
122
123 struct acpi_video_enumerated_device {
124         union {
125                 u32 int_val;
126                 struct acpi_video_device_attrib attrib;
127         } value;
128         struct acpi_video_device *bind_info;
129 };
130
131 struct acpi_video_bus {
132         struct acpi_device *device;
133         u8 dos_setting;
134         struct acpi_video_enumerated_device *attached_array;
135         u8 attached_count;
136         struct acpi_video_bus_cap cap;
137         struct acpi_video_bus_flags flags;
138         struct semaphore sem;
139         struct list_head video_device_list;
140         struct proc_dir_entry *dir;
141         struct input_dev *input;
142         char phys[32];  /* for input device */
143 };
144
145 struct acpi_video_device_flags {
146         u8 crt:1;
147         u8 lcd:1;
148         u8 tvout:1;
149         u8 dvi:1;
150         u8 bios:1;
151         u8 unknown:1;
152         u8 reserved:2;
153 };
154
155 struct acpi_video_device_cap {
156         u8 _ADR:1;              /*Return the unique ID */
157         u8 _BCL:1;              /*Query list of brightness control levels supported */
158         u8 _BCM:1;              /*Set the brightness level */
159         u8 _BQC:1;              /* Get current brightness level */
160         u8 _DDC:1;              /*Return the EDID for this device */
161         u8 _DCS:1;              /*Return status of output device */
162         u8 _DGS:1;              /*Query graphics state */
163         u8 _DSS:1;              /*Device state set */
164 };
165
166 struct acpi_video_device_brightness {
167         int curr;
168         int count;
169         int *levels;
170 };
171
172 struct acpi_video_device {
173         unsigned long device_id;
174         struct acpi_video_device_flags flags;
175         struct acpi_video_device_cap cap;
176         struct list_head entry;
177         struct acpi_video_bus *video;
178         struct acpi_device *dev;
179         struct acpi_video_device_brightness *brightness;
180         struct backlight_device *backlight;
181         struct output_device *output_dev;
182 };
183
184 /* bus */
185 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
186 static struct file_operations acpi_video_bus_info_fops = {
187         .open = acpi_video_bus_info_open_fs,
188         .read = seq_read,
189         .llseek = seq_lseek,
190         .release = single_release,
191 };
192
193 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
194 static struct file_operations acpi_video_bus_ROM_fops = {
195         .open = acpi_video_bus_ROM_open_fs,
196         .read = seq_read,
197         .llseek = seq_lseek,
198         .release = single_release,
199 };
200
201 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
202                                             struct file *file);
203 static struct file_operations acpi_video_bus_POST_info_fops = {
204         .open = acpi_video_bus_POST_info_open_fs,
205         .read = seq_read,
206         .llseek = seq_lseek,
207         .release = single_release,
208 };
209
210 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
211 static struct file_operations acpi_video_bus_POST_fops = {
212         .open = acpi_video_bus_POST_open_fs,
213         .read = seq_read,
214         .llseek = seq_lseek,
215         .release = single_release,
216 };
217
218 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
219 static struct file_operations acpi_video_bus_DOS_fops = {
220         .open = acpi_video_bus_DOS_open_fs,
221         .read = seq_read,
222         .llseek = seq_lseek,
223         .release = single_release,
224 };
225
226 /* device */
227 static int acpi_video_device_info_open_fs(struct inode *inode,
228                                           struct file *file);
229 static struct file_operations acpi_video_device_info_fops = {
230         .open = acpi_video_device_info_open_fs,
231         .read = seq_read,
232         .llseek = seq_lseek,
233         .release = single_release,
234 };
235
236 static int acpi_video_device_state_open_fs(struct inode *inode,
237                                            struct file *file);
238 static struct file_operations acpi_video_device_state_fops = {
239         .open = acpi_video_device_state_open_fs,
240         .read = seq_read,
241         .llseek = seq_lseek,
242         .release = single_release,
243 };
244
245 static int acpi_video_device_brightness_open_fs(struct inode *inode,
246                                                 struct file *file);
247 static struct file_operations acpi_video_device_brightness_fops = {
248         .open = acpi_video_device_brightness_open_fs,
249         .read = seq_read,
250         .llseek = seq_lseek,
251         .release = single_release,
252 };
253
254 static int acpi_video_device_EDID_open_fs(struct inode *inode,
255                                           struct file *file);
256 static struct file_operations acpi_video_device_EDID_fops = {
257         .open = acpi_video_device_EDID_open_fs,
258         .read = seq_read,
259         .llseek = seq_lseek,
260         .release = single_release,
261 };
262
263 static char device_decode[][30] = {
264         "motherboard VGA device",
265         "PCI VGA device",
266         "AGP VGA device",
267         "UNKNOWN",
268 };
269
270 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
271 static void acpi_video_device_rebind(struct acpi_video_bus *video);
272 static void acpi_video_device_bind(struct acpi_video_bus *video,
273                                    struct acpi_video_device *device);
274 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
275 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
276 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
277                         int level);
278 static int acpi_video_device_lcd_get_level_current(
279                         struct acpi_video_device *device,
280                         unsigned long *level);
281 static int acpi_video_get_next_level(struct acpi_video_device *device,
282                                      u32 level_current, u32 event);
283 static void acpi_video_switch_brightness(struct acpi_video_device *device,
284                                          int event);
285 static int acpi_video_device_get_state(struct acpi_video_device *device,
286                             unsigned long *state);
287 static int acpi_video_output_get(struct output_device *od);
288 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
289
290 /*backlight device sysfs support*/
291 static int acpi_video_get_brightness(struct backlight_device *bd)
292 {
293         unsigned long cur_level;
294         struct acpi_video_device *vd =
295                 (struct acpi_video_device *)bl_get_data(bd);
296         acpi_video_device_lcd_get_level_current(vd, &cur_level);
297         return (int) cur_level;
298 }
299
300 static int acpi_video_set_brightness(struct backlight_device *bd)
301 {
302         int request_level = bd->props.brightness;
303         struct acpi_video_device *vd =
304                 (struct acpi_video_device *)bl_get_data(bd);
305         acpi_video_device_lcd_set_level(vd, request_level);
306         return 0;
307 }
308
309 static struct backlight_ops acpi_backlight_ops = {
310         .get_brightness = acpi_video_get_brightness,
311         .update_status  = acpi_video_set_brightness,
312 };
313
314 /*video output device sysfs support*/
315 static int acpi_video_output_get(struct output_device *od)
316 {
317         unsigned long state;
318         struct acpi_video_device *vd =
319                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
320         acpi_video_device_get_state(vd, &state);
321         return (int)state;
322 }
323
324 static int acpi_video_output_set(struct output_device *od)
325 {
326         unsigned long state = od->request_state;
327         struct acpi_video_device *vd=
328                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
329         return acpi_video_device_set_state(vd, state);
330 }
331
332 static struct output_properties acpi_output_properties = {
333         .set_state = acpi_video_output_set,
334         .get_status = acpi_video_output_get,
335 };
336 /* --------------------------------------------------------------------------
337                                Video Management
338    -------------------------------------------------------------------------- */
339
340 /* device */
341
342 static int
343 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
344 {
345         int status;
346
347         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
348
349         return status;
350 }
351
352 static int
353 acpi_video_device_get_state(struct acpi_video_device *device,
354                             unsigned long *state)
355 {
356         int status;
357
358         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
359
360         return status;
361 }
362
363 static int
364 acpi_video_device_set_state(struct acpi_video_device *device, int state)
365 {
366         int status;
367         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
368         struct acpi_object_list args = { 1, &arg0 };
369         unsigned long ret;
370
371
372         arg0.integer.value = state;
373         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
374
375         return status;
376 }
377
378 static int
379 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
380                                    union acpi_object **levels)
381 {
382         int status;
383         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
384         union acpi_object *obj;
385
386
387         *levels = NULL;
388
389         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
390         if (!ACPI_SUCCESS(status))
391                 return status;
392         obj = (union acpi_object *)buffer.pointer;
393         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
394                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
395                 status = -EFAULT;
396                 goto err;
397         }
398
399         *levels = obj;
400
401         return 0;
402
403       err:
404         kfree(buffer.pointer);
405
406         return status;
407 }
408
409 static int
410 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
411 {
412         int status = AE_OK;
413         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
414         struct acpi_object_list args = { 1, &arg0 };
415
416
417         arg0.integer.value = level;
418
419         if (device->cap._BCM)
420                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
421                                               &args, NULL);
422         device->brightness->curr = level;
423         return status;
424 }
425
426 static int
427 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
428                                         unsigned long *level)
429 {
430         if (device->cap._BQC)
431                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
432                                              level);
433         *level = device->brightness->curr;
434         return AE_OK;
435 }
436
437 static int
438 acpi_video_device_EDID(struct acpi_video_device *device,
439                        union acpi_object **edid, ssize_t length)
440 {
441         int status;
442         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
443         union acpi_object *obj;
444         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
445         struct acpi_object_list args = { 1, &arg0 };
446
447
448         *edid = NULL;
449
450         if (!device)
451                 return -ENODEV;
452         if (length == 128)
453                 arg0.integer.value = 1;
454         else if (length == 256)
455                 arg0.integer.value = 2;
456         else
457                 return -EINVAL;
458
459         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
460         if (ACPI_FAILURE(status))
461                 return -ENODEV;
462
463         obj = buffer.pointer;
464
465         if (obj && obj->type == ACPI_TYPE_BUFFER)
466                 *edid = obj;
467         else {
468                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
469                 status = -EFAULT;
470                 kfree(obj);
471         }
472
473         return status;
474 }
475
476 /* bus */
477
478 static int
479 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
480 {
481         int status;
482         unsigned long tmp;
483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
484         struct acpi_object_list args = { 1, &arg0 };
485
486
487         arg0.integer.value = option;
488
489         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
490         if (ACPI_SUCCESS(status))
491                 status = tmp ? (-EINVAL) : (AE_OK);
492
493         return status;
494 }
495
496 static int
497 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
498 {
499         int status;
500
501         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
502
503         return status;
504 }
505
506 static int
507 acpi_video_bus_POST_options(struct acpi_video_bus *video,
508                             unsigned long *options)
509 {
510         int status;
511
512         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
513         *options &= 3;
514
515         return status;
516 }
517
518 /*
519  *  Arg:
520  *      video           : video bus device pointer
521  *      bios_flag       : 
522  *              0.      The system BIOS should NOT automatically switch(toggle)
523  *                      the active display output.
524  *              1.      The system BIOS should automatically switch (toggle) the
525  *                      active display output. No switch event.
526  *              2.      The _DGS value should be locked.
527  *              3.      The system BIOS should not automatically switch (toggle) the
528  *                      active display output, but instead generate the display switch
529  *                      event notify code.
530  *      lcd_flag        :
531  *              0.      The system BIOS should automatically control the brightness level
532  *                      of the LCD when the power changes from AC to DC
533  *              1.      The system BIOS should NOT automatically control the brightness 
534  *                      level of the LCD when the power changes from AC to DC.
535  * Return Value:
536  *              -1      wrong arg.
537  */
538
539 static int
540 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
541 {
542         acpi_integer status = 0;
543         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
544         struct acpi_object_list args = { 1, &arg0 };
545
546
547         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
548                 status = -1;
549                 goto Failed;
550         }
551         arg0.integer.value = (lcd_flag << 2) | bios_flag;
552         video->dos_setting = arg0.integer.value;
553         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
554
555       Failed:
556         return status;
557 }
558
559 /*
560  *  Arg:        
561  *      device  : video output device (LCD, CRT, ..)
562  *
563  *  Return Value:
564  *      None
565  *
566  *  Find out all required AML methods defined under the output
567  *  device.
568  */
569
570 static void acpi_video_device_find_cap(struct acpi_video_device *device)
571 {
572         acpi_handle h_dummy1;
573         int i;
574         u32 max_level = 0;
575         union acpi_object *obj = NULL;
576         struct acpi_video_device_brightness *br = NULL;
577
578
579         memset(&device->cap, 0, 4);
580
581         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
582                 device->cap._ADR = 1;
583         }
584         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
585                 device->cap._BCL = 1;
586         }
587         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
588                 device->cap._BCM = 1;
589         }
590         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
591                 device->cap._BQC = 1;
592         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
593                 device->cap._DDC = 1;
594         }
595         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
596                 device->cap._DCS = 1;
597         }
598         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
599                 device->cap._DGS = 1;
600         }
601         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
602                 device->cap._DSS = 1;
603         }
604
605         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
606
607                 if (obj->package.count >= 2) {
608                         int count = 0;
609                         union acpi_object *o;
610
611                         br = kzalloc(sizeof(*br), GFP_KERNEL);
612                         if (!br) {
613                                 printk(KERN_ERR "can't allocate memory\n");
614                         } else {
615                                 br->levels = kmalloc(obj->package.count *
616                                                      sizeof *(br->levels), GFP_KERNEL);
617                                 if (!br->levels)
618                                         goto out;
619
620                                 for (i = 0; i < obj->package.count; i++) {
621                                         o = (union acpi_object *)&obj->package.
622                                             elements[i];
623                                         if (o->type != ACPI_TYPE_INTEGER) {
624                                                 printk(KERN_ERR PREFIX "Invalid data\n");
625                                                 continue;
626                                         }
627                                         br->levels[count] = (u32) o->integer.value;
628
629                                         if (br->levels[count] > max_level)
630                                                 max_level = br->levels[count];
631                                         count++;
632                                 }
633                               out:
634                                 if (count < 2) {
635                                         kfree(br->levels);
636                                         kfree(br);
637                                 } else {
638                                         br->count = count;
639                                         device->brightness = br;
640                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
641                                                           "found %d brightness levels\n",
642                                                           count));
643                                 }
644                         }
645                 }
646
647         } else {
648                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
649         }
650
651         kfree(obj);
652
653         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
654                 unsigned long tmp;
655                 static int count = 0;
656                 char *name;
657                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
658                 if (!name)
659                         return;
660
661                 sprintf(name, "acpi_video%d", count++);
662                 acpi_video_device_lcd_get_level_current(device, &tmp);
663                 device->backlight = backlight_device_register(name,
664                         NULL, device, &acpi_backlight_ops);
665                 device->backlight->props.max_brightness = max_level;
666                 device->backlight->props.brightness = (int)tmp;
667                 backlight_update_status(device->backlight);
668
669                 kfree(name);
670         }
671         if (device->cap._DCS && device->cap._DSS){
672                 static int count = 0;
673                 char *name;
674                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
675                 if (!name)
676                         return;
677                 sprintf(name, "acpi_video%d", count++);
678                 device->output_dev = video_output_register(name,
679                                 NULL, device, &acpi_output_properties);
680                 kfree(name);
681         }
682         return;
683 }
684
685 /*
686  *  Arg:        
687  *      device  : video output device (VGA)
688  *
689  *  Return Value:
690  *      None
691  *
692  *  Find out all required AML methods defined under the video bus device.
693  */
694
695 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
696 {
697         acpi_handle h_dummy1;
698
699         memset(&video->cap, 0, 4);
700         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
701                 video->cap._DOS = 1;
702         }
703         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
704                 video->cap._DOD = 1;
705         }
706         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
707                 video->cap._ROM = 1;
708         }
709         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
710                 video->cap._GPD = 1;
711         }
712         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
713                 video->cap._SPD = 1;
714         }
715         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
716                 video->cap._VPO = 1;
717         }
718 }
719
720 /*
721  * Check whether the video bus device has required AML method to
722  * support the desired features
723  */
724
725 static int acpi_video_bus_check(struct acpi_video_bus *video)
726 {
727         acpi_status status = -ENOENT;
728
729
730         if (!video)
731                 return -EINVAL;
732
733         /* Since there is no HID, CID and so on for VGA driver, we have
734          * to check well known required nodes.
735          */
736
737         /* Does this device support video switching? */
738         if (video->cap._DOS) {
739                 video->flags.multihead = 1;
740                 status = 0;
741         }
742
743         /* Does this device support retrieving a video ROM? */
744         if (video->cap._ROM) {
745                 video->flags.rom = 1;
746                 status = 0;
747         }
748
749         /* Does this device support configuring which video device to POST? */
750         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
751                 video->flags.post = 1;
752                 status = 0;
753         }
754
755         return status;
756 }
757
758 /* --------------------------------------------------------------------------
759                               FS Interface (/proc)
760    -------------------------------------------------------------------------- */
761
762 static struct proc_dir_entry *acpi_video_dir;
763
764 /* video devices */
765
766 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
767 {
768         struct acpi_video_device *dev = seq->private;
769
770
771         if (!dev)
772                 goto end;
773
774         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
775         seq_printf(seq, "type:         ");
776         if (dev->flags.crt)
777                 seq_printf(seq, "CRT\n");
778         else if (dev->flags.lcd)
779                 seq_printf(seq, "LCD\n");
780         else if (dev->flags.tvout)
781                 seq_printf(seq, "TVOUT\n");
782         else if (dev->flags.dvi)
783                 seq_printf(seq, "DVI\n");
784         else
785                 seq_printf(seq, "UNKNOWN\n");
786
787         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
788
789       end:
790         return 0;
791 }
792
793 static int
794 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
795 {
796         return single_open(file, acpi_video_device_info_seq_show,
797                            PDE(inode)->data);
798 }
799
800 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
801 {
802         int status;
803         struct acpi_video_device *dev = seq->private;
804         unsigned long state;
805
806
807         if (!dev)
808                 goto end;
809
810         status = acpi_video_device_get_state(dev, &state);
811         seq_printf(seq, "state:     ");
812         if (ACPI_SUCCESS(status))
813                 seq_printf(seq, "0x%02lx\n", state);
814         else
815                 seq_printf(seq, "<not supported>\n");
816
817         status = acpi_video_device_query(dev, &state);
818         seq_printf(seq, "query:     ");
819         if (ACPI_SUCCESS(status))
820                 seq_printf(seq, "0x%02lx\n", state);
821         else
822                 seq_printf(seq, "<not supported>\n");
823
824       end:
825         return 0;
826 }
827
828 static int
829 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
830 {
831         return single_open(file, acpi_video_device_state_seq_show,
832                            PDE(inode)->data);
833 }
834
835 static ssize_t
836 acpi_video_device_write_state(struct file *file,
837                               const char __user * buffer,
838                               size_t count, loff_t * data)
839 {
840         int status;
841         struct seq_file *m = file->private_data;
842         struct acpi_video_device *dev = m->private;
843         char str[12] = { 0 };
844         u32 state = 0;
845
846
847         if (!dev || count + 1 > sizeof str)
848                 return -EINVAL;
849
850         if (copy_from_user(str, buffer, count))
851                 return -EFAULT;
852
853         str[count] = 0;
854         state = simple_strtoul(str, NULL, 0);
855         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
856
857         status = acpi_video_device_set_state(dev, state);
858
859         if (status)
860                 return -EFAULT;
861
862         return count;
863 }
864
865 static int
866 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
867 {
868         struct acpi_video_device *dev = seq->private;
869         int i;
870
871
872         if (!dev || !dev->brightness) {
873                 seq_printf(seq, "<not supported>\n");
874                 return 0;
875         }
876
877         seq_printf(seq, "levels: ");
878         for (i = 0; i < dev->brightness->count; i++)
879                 seq_printf(seq, " %d", dev->brightness->levels[i]);
880         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
881
882         return 0;
883 }
884
885 static int
886 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
887 {
888         return single_open(file, acpi_video_device_brightness_seq_show,
889                            PDE(inode)->data);
890 }
891
892 static ssize_t
893 acpi_video_device_write_brightness(struct file *file,
894                                    const char __user * buffer,
895                                    size_t count, loff_t * data)
896 {
897         struct seq_file *m = file->private_data;
898         struct acpi_video_device *dev = m->private;
899         char str[4] = { 0 };
900         unsigned int level = 0;
901         int i;
902
903
904         if (!dev || !dev->brightness || count + 1 > sizeof str)
905                 return -EINVAL;
906
907         if (copy_from_user(str, buffer, count))
908                 return -EFAULT;
909
910         str[count] = 0;
911         level = simple_strtoul(str, NULL, 0);
912
913         if (level > 100)
914                 return -EFAULT;
915
916         /* validate through the list of available levels */
917         for (i = 0; i < dev->brightness->count; i++)
918                 if (level == dev->brightness->levels[i]) {
919                         if (ACPI_SUCCESS
920                             (acpi_video_device_lcd_set_level(dev, level)))
921                                 dev->brightness->curr = level;
922                         break;
923                 }
924
925         return count;
926 }
927
928 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
929 {
930         struct acpi_video_device *dev = seq->private;
931         int status;
932         int i;
933         union acpi_object *edid = NULL;
934
935
936         if (!dev)
937                 goto out;
938
939         status = acpi_video_device_EDID(dev, &edid, 128);
940         if (ACPI_FAILURE(status)) {
941                 status = acpi_video_device_EDID(dev, &edid, 256);
942         }
943
944         if (ACPI_FAILURE(status)) {
945                 goto out;
946         }
947
948         if (edid && edid->type == ACPI_TYPE_BUFFER) {
949                 for (i = 0; i < edid->buffer.length; i++)
950                         seq_putc(seq, edid->buffer.pointer[i]);
951         }
952
953       out:
954         if (!edid)
955                 seq_printf(seq, "<not supported>\n");
956         else
957                 kfree(edid);
958
959         return 0;
960 }
961
962 static int
963 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
964 {
965         return single_open(file, acpi_video_device_EDID_seq_show,
966                            PDE(inode)->data);
967 }
968
969 static int acpi_video_device_add_fs(struct acpi_device *device)
970 {
971         struct proc_dir_entry *entry = NULL;
972         struct acpi_video_device *vid_dev;
973
974
975         if (!device)
976                 return -ENODEV;
977
978         vid_dev = acpi_driver_data(device);
979         if (!vid_dev)
980                 return -ENODEV;
981
982         if (!acpi_device_dir(device)) {
983                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
984                                                      vid_dev->video->dir);
985                 if (!acpi_device_dir(device))
986                         return -ENODEV;
987                 acpi_device_dir(device)->owner = THIS_MODULE;
988         }
989
990         /* 'info' [R] */
991         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
992         if (!entry)
993                 return -ENODEV;
994         else {
995                 entry->proc_fops = &acpi_video_device_info_fops;
996                 entry->data = acpi_driver_data(device);
997                 entry->owner = THIS_MODULE;
998         }
999
1000         /* 'state' [R/W] */
1001         entry =
1002             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1003                               acpi_device_dir(device));
1004         if (!entry)
1005                 return -ENODEV;
1006         else {
1007                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1008                 entry->proc_fops = &acpi_video_device_state_fops;
1009                 entry->data = acpi_driver_data(device);
1010                 entry->owner = THIS_MODULE;
1011         }
1012
1013         /* 'brightness' [R/W] */
1014         entry =
1015             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1016                               acpi_device_dir(device));
1017         if (!entry)
1018                 return -ENODEV;
1019         else {
1020                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1021                 entry->proc_fops = &acpi_video_device_brightness_fops;
1022                 entry->data = acpi_driver_data(device);
1023                 entry->owner = THIS_MODULE;
1024         }
1025
1026         /* 'EDID' [R] */
1027         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1028         if (!entry)
1029                 return -ENODEV;
1030         else {
1031                 entry->proc_fops = &acpi_video_device_EDID_fops;
1032                 entry->data = acpi_driver_data(device);
1033                 entry->owner = THIS_MODULE;
1034         }
1035
1036         return 0;
1037 }
1038
1039 static int acpi_video_device_remove_fs(struct acpi_device *device)
1040 {
1041         struct acpi_video_device *vid_dev;
1042
1043         vid_dev = acpi_driver_data(device);
1044         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1045                 return -ENODEV;
1046
1047         if (acpi_device_dir(device)) {
1048                 remove_proc_entry("info", acpi_device_dir(device));
1049                 remove_proc_entry("state", acpi_device_dir(device));
1050                 remove_proc_entry("brightness", acpi_device_dir(device));
1051                 remove_proc_entry("EDID", acpi_device_dir(device));
1052                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1053                 acpi_device_dir(device) = NULL;
1054         }
1055
1056         return 0;
1057 }
1058
1059 /* video bus */
1060 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1061 {
1062         struct acpi_video_bus *video = seq->private;
1063
1064
1065         if (!video)
1066                 goto end;
1067
1068         seq_printf(seq, "Switching heads:              %s\n",
1069                    video->flags.multihead ? "yes" : "no");
1070         seq_printf(seq, "Video ROM:                    %s\n",
1071                    video->flags.rom ? "yes" : "no");
1072         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1073                    video->flags.post ? "yes" : "no");
1074
1075       end:
1076         return 0;
1077 }
1078
1079 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1080 {
1081         return single_open(file, acpi_video_bus_info_seq_show,
1082                            PDE(inode)->data);
1083 }
1084
1085 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1086 {
1087         struct acpi_video_bus *video = seq->private;
1088
1089
1090         if (!video)
1091                 goto end;
1092
1093         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1094         seq_printf(seq, "<TODO>\n");
1095
1096       end:
1097         return 0;
1098 }
1099
1100 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1101 {
1102         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1103 }
1104
1105 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1106 {
1107         struct acpi_video_bus *video = seq->private;
1108         unsigned long options;
1109         int status;
1110
1111
1112         if (!video)
1113                 goto end;
1114
1115         status = acpi_video_bus_POST_options(video, &options);
1116         if (ACPI_SUCCESS(status)) {
1117                 if (!(options & 1)) {
1118                         printk(KERN_WARNING PREFIX
1119                                "The motherboard VGA device is not listed as a possible POST device.\n");
1120                         printk(KERN_WARNING PREFIX
1121                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1122                 }
1123                 printk("%lx\n", options);
1124                 seq_printf(seq, "can POST: <integrated video>");
1125                 if (options & 2)
1126                         seq_printf(seq, " <PCI video>");
1127                 if (options & 4)
1128                         seq_printf(seq, " <AGP video>");
1129                 seq_putc(seq, '\n');
1130         } else
1131                 seq_printf(seq, "<not supported>\n");
1132       end:
1133         return 0;
1134 }
1135
1136 static int
1137 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1138 {
1139         return single_open(file, acpi_video_bus_POST_info_seq_show,
1140                            PDE(inode)->data);
1141 }
1142
1143 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1144 {
1145         struct acpi_video_bus *video = seq->private;
1146         int status;
1147         unsigned long id;
1148
1149
1150         if (!video)
1151                 goto end;
1152
1153         status = acpi_video_bus_get_POST(video, &id);
1154         if (!ACPI_SUCCESS(status)) {
1155                 seq_printf(seq, "<not supported>\n");
1156                 goto end;
1157         }
1158         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1159
1160       end:
1161         return 0;
1162 }
1163
1164 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1165 {
1166         struct acpi_video_bus *video = seq->private;
1167
1168
1169         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1170
1171         return 0;
1172 }
1173
1174 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1175 {
1176         return single_open(file, acpi_video_bus_POST_seq_show,
1177                            PDE(inode)->data);
1178 }
1179
1180 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1181 {
1182         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1183 }
1184
1185 static ssize_t
1186 acpi_video_bus_write_POST(struct file *file,
1187                           const char __user * buffer,
1188                           size_t count, loff_t * data)
1189 {
1190         int status;
1191         struct seq_file *m = file->private_data;
1192         struct acpi_video_bus *video = m->private;
1193         char str[12] = { 0 };
1194         unsigned long opt, options;
1195
1196
1197         if (!video || count + 1 > sizeof str)
1198                 return -EINVAL;
1199
1200         status = acpi_video_bus_POST_options(video, &options);
1201         if (!ACPI_SUCCESS(status))
1202                 return -EINVAL;
1203
1204         if (copy_from_user(str, buffer, count))
1205                 return -EFAULT;
1206
1207         str[count] = 0;
1208         opt = strtoul(str, NULL, 0);
1209         if (opt > 3)
1210                 return -EFAULT;
1211
1212         /* just in case an OEM 'forgot' the motherboard... */
1213         options |= 1;
1214
1215         if (options & (1ul << opt)) {
1216                 status = acpi_video_bus_set_POST(video, opt);
1217                 if (!ACPI_SUCCESS(status))
1218                         return -EFAULT;
1219
1220         }
1221
1222         return count;
1223 }
1224
1225 static ssize_t
1226 acpi_video_bus_write_DOS(struct file *file,
1227                          const char __user * buffer,
1228                          size_t count, loff_t * data)
1229 {
1230         int status;
1231         struct seq_file *m = file->private_data;
1232         struct acpi_video_bus *video = m->private;
1233         char str[12] = { 0 };
1234         unsigned long opt;
1235
1236
1237         if (!video || count + 1 > sizeof str)
1238                 return -EINVAL;
1239
1240         if (copy_from_user(str, buffer, count))
1241                 return -EFAULT;
1242
1243         str[count] = 0;
1244         opt = strtoul(str, NULL, 0);
1245         if (opt > 7)
1246                 return -EFAULT;
1247
1248         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1249
1250         if (!ACPI_SUCCESS(status))
1251                 return -EFAULT;
1252
1253         return count;
1254 }
1255
1256 static int acpi_video_bus_add_fs(struct acpi_device *device)
1257 {
1258         struct proc_dir_entry *entry = NULL;
1259         struct acpi_video_bus *video;
1260
1261
1262         video = acpi_driver_data(device);
1263
1264         if (!acpi_device_dir(device)) {
1265                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1266                                                      acpi_video_dir);
1267                 if (!acpi_device_dir(device))
1268                         return -ENODEV;
1269                 video->dir = acpi_device_dir(device);
1270                 acpi_device_dir(device)->owner = THIS_MODULE;
1271         }
1272
1273         /* 'info' [R] */
1274         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1275         if (!entry)
1276                 return -ENODEV;
1277         else {
1278                 entry->proc_fops = &acpi_video_bus_info_fops;
1279                 entry->data = acpi_driver_data(device);
1280                 entry->owner = THIS_MODULE;
1281         }
1282
1283         /* 'ROM' [R] */
1284         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1285         if (!entry)
1286                 return -ENODEV;
1287         else {
1288                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1289                 entry->data = acpi_driver_data(device);
1290                 entry->owner = THIS_MODULE;
1291         }
1292
1293         /* 'POST_info' [R] */
1294         entry =
1295             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1296         if (!entry)
1297                 return -ENODEV;
1298         else {
1299                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1300                 entry->data = acpi_driver_data(device);
1301                 entry->owner = THIS_MODULE;
1302         }
1303
1304         /* 'POST' [R/W] */
1305         entry =
1306             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1307                               acpi_device_dir(device));
1308         if (!entry)
1309                 return -ENODEV;
1310         else {
1311                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1312                 entry->proc_fops = &acpi_video_bus_POST_fops;
1313                 entry->data = acpi_driver_data(device);
1314                 entry->owner = THIS_MODULE;
1315         }
1316
1317         /* 'DOS' [R/W] */
1318         entry =
1319             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1320                               acpi_device_dir(device));
1321         if (!entry)
1322                 return -ENODEV;
1323         else {
1324                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1325                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1326                 entry->data = acpi_driver_data(device);
1327                 entry->owner = THIS_MODULE;
1328         }
1329
1330         return 0;
1331 }
1332
1333 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1334 {
1335         struct acpi_video_bus *video;
1336
1337
1338         video = acpi_driver_data(device);
1339
1340         if (acpi_device_dir(device)) {
1341                 remove_proc_entry("info", acpi_device_dir(device));
1342                 remove_proc_entry("ROM", acpi_device_dir(device));
1343                 remove_proc_entry("POST_info", acpi_device_dir(device));
1344                 remove_proc_entry("POST", acpi_device_dir(device));
1345                 remove_proc_entry("DOS", acpi_device_dir(device));
1346                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1347                 acpi_device_dir(device) = NULL;
1348         }
1349
1350         return 0;
1351 }
1352
1353 /* --------------------------------------------------------------------------
1354                                  Driver Interface
1355    -------------------------------------------------------------------------- */
1356
1357 /* device interface */
1358 static struct acpi_video_device_attrib*
1359 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1360 {
1361         int count;
1362
1363         for(count = 0; count < video->attached_count; count++)
1364                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1365                         return &(video->attached_array[count].value.attrib);
1366         return NULL;
1367 }
1368
1369 static int
1370 acpi_video_bus_get_one_device(struct acpi_device *device,
1371                               struct acpi_video_bus *video)
1372 {
1373         unsigned long device_id;
1374         int status;
1375         struct acpi_video_device *data;
1376         struct acpi_video_device_attrib* attribute;
1377
1378         if (!device || !video)
1379                 return -EINVAL;
1380
1381         status =
1382             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1383         if (ACPI_SUCCESS(status)) {
1384
1385                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1386                 if (!data)
1387                         return -ENOMEM;
1388
1389                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1390                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1391                 acpi_driver_data(device) = data;
1392
1393                 data->device_id = device_id;
1394                 data->video = video;
1395                 data->dev = device;
1396
1397                 attribute = acpi_video_get_device_attr(video, device_id);
1398
1399                 if((attribute != NULL) && attribute->device_id_scheme) {
1400                         switch (attribute->display_type) {
1401                         case ACPI_VIDEO_DISPLAY_CRT:
1402                                 data->flags.crt = 1;
1403                                 break;
1404                         case ACPI_VIDEO_DISPLAY_TV:
1405                                 data->flags.tvout = 1;
1406                                 break;
1407                         case ACPI_VIDEO_DISPLAY_DVI:
1408                                 data->flags.dvi = 1;
1409                                 break;
1410                         case ACPI_VIDEO_DISPLAY_LCD:
1411                                 data->flags.lcd = 1;
1412                                 break;
1413                         default:
1414                                 data->flags.unknown = 1;
1415                                 break;
1416                         }
1417                         if(attribute->bios_can_detect)
1418                                 data->flags.bios = 1;
1419                 } else
1420                         data->flags.unknown = 1;
1421
1422                 acpi_video_device_bind(video, data);
1423                 acpi_video_device_find_cap(data);
1424
1425                 status = acpi_install_notify_handler(device->handle,
1426                                                      ACPI_DEVICE_NOTIFY,
1427                                                      acpi_video_device_notify,
1428                                                      data);
1429                 if (ACPI_FAILURE(status)) {
1430                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1431                                           "Error installing notify handler\n"));
1432                         if(data->brightness)
1433                                 kfree(data->brightness->levels);
1434                         kfree(data->brightness);
1435                         kfree(data);
1436                         return -ENODEV;
1437                 }
1438
1439                 down(&video->sem);
1440                 list_add_tail(&data->entry, &video->video_device_list);
1441                 up(&video->sem);
1442
1443                 acpi_video_device_add_fs(device);
1444
1445                 return 0;
1446         }
1447
1448         return -ENOENT;
1449 }
1450
1451 /*
1452  *  Arg:
1453  *      video   : video bus device 
1454  *
1455  *  Return:
1456  *      none
1457  *  
1458  *  Enumerate the video device list of the video bus, 
1459  *  bind the ids with the corresponding video devices
1460  *  under the video bus.
1461  */
1462
1463 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1464 {
1465         struct list_head *node, *next;
1466         list_for_each_safe(node, next, &video->video_device_list) {
1467                 struct acpi_video_device *dev =
1468                     container_of(node, struct acpi_video_device, entry);
1469                 acpi_video_device_bind(video, dev);
1470         }
1471 }
1472
1473 /*
1474  *  Arg:
1475  *      video   : video bus device 
1476  *      device  : video output device under the video 
1477  *              bus
1478  *
1479  *  Return:
1480  *      none
1481  *  
1482  *  Bind the ids with the corresponding video devices
1483  *  under the video bus.
1484  */
1485
1486 static void
1487 acpi_video_device_bind(struct acpi_video_bus *video,
1488                        struct acpi_video_device *device)
1489 {
1490         int i;
1491
1492 #define IDS_VAL(i) video->attached_array[i].value.int_val
1493 #define IDS_BIND(i) video->attached_array[i].bind_info
1494
1495         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1496              i < video->attached_count; i++) {
1497                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1498                         IDS_BIND(i) = device;
1499                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1500                 }
1501         }
1502 #undef IDS_VAL
1503 #undef IDS_BIND
1504 }
1505
1506 /*
1507  *  Arg:
1508  *      video   : video bus device 
1509  *
1510  *  Return:
1511  *      < 0     : error
1512  *  
1513  *  Call _DOD to enumerate all devices attached to display adapter
1514  *
1515  */
1516
1517 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1518 {
1519         int status;
1520         int count;
1521         int i;
1522         struct acpi_video_enumerated_device *active_device_list;
1523         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1524         union acpi_object *dod = NULL;
1525         union acpi_object *obj;
1526
1527         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1528         if (!ACPI_SUCCESS(status)) {
1529                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1530                 return status;
1531         }
1532
1533         dod = buffer.pointer;
1534         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1535                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1536                 status = -EFAULT;
1537                 goto out;
1538         }
1539
1540         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1541                           dod->package.count));
1542
1543         active_device_list = kmalloc((1 +
1544                                       dod->package.count) *
1545                                      sizeof(struct
1546                                             acpi_video_enumerated_device),
1547                                      GFP_KERNEL);
1548
1549         if (!active_device_list) {
1550                 status = -ENOMEM;
1551                 goto out;
1552         }
1553
1554         count = 0;
1555         for (i = 0; i < dod->package.count; i++) {
1556                 obj = &dod->package.elements[i];
1557
1558                 if (obj->type != ACPI_TYPE_INTEGER) {
1559                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1560                         active_device_list[i].value.int_val =
1561                             ACPI_VIDEO_HEAD_INVALID;
1562                 }
1563                 active_device_list[i].value.int_val = obj->integer.value;
1564                 active_device_list[i].bind_info = NULL;
1565                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1566                                   (int)obj->integer.value));
1567                 count++;
1568         }
1569         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1570
1571         kfree(video->attached_array);
1572
1573         video->attached_array = active_device_list;
1574         video->attached_count = count;
1575       out:
1576         kfree(buffer.pointer);
1577         return status;
1578 }
1579
1580 /*
1581  *  Arg:
1582  *      video   : video bus device 
1583  *      event   : notify event
1584  *
1585  *  Return:
1586  *      < 0     : error
1587  *  
1588  *      1. Find out the current active output device.
1589  *      2. Identify the next output device to switch to.
1590  *      3. call _DSS to do actual switch.
1591  */
1592
1593 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1594 {
1595         struct list_head *node, *next;
1596         struct acpi_video_device *dev = NULL;
1597         struct acpi_video_device *dev_next = NULL;
1598         struct acpi_video_device *dev_prev = NULL;
1599         unsigned long state;
1600         int status = 0;
1601
1602
1603         list_for_each_safe(node, next, &video->video_device_list) {
1604                 dev = container_of(node, struct acpi_video_device, entry);
1605                 status = acpi_video_device_get_state(dev, &state);
1606                 if (state & 0x2) {
1607                         dev_next =
1608                             container_of(node->next, struct acpi_video_device,
1609                                          entry);
1610                         dev_prev =
1611                             container_of(node->prev, struct acpi_video_device,
1612                                          entry);
1613                         goto out;
1614                 }
1615         }
1616         dev_next = container_of(node->next, struct acpi_video_device, entry);
1617         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1618       out:
1619         switch (event) {
1620         case ACPI_VIDEO_NOTIFY_CYCLE:
1621         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1622                 acpi_video_device_set_state(dev, 0);
1623                 acpi_video_device_set_state(dev_next, 0x80000001);
1624                 break;
1625         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1626                 acpi_video_device_set_state(dev, 0);
1627                 acpi_video_device_set_state(dev_prev, 0x80000001);
1628         default:
1629                 break;
1630         }
1631
1632         return status;
1633 }
1634
1635 static int
1636 acpi_video_get_next_level(struct acpi_video_device *device,
1637                           u32 level_current, u32 event)
1638 {
1639         int min, max, min_above, max_below, i, l, delta = 255;
1640         max = max_below = 0;
1641         min = min_above = 255;
1642         /* Find closest level to level_current */
1643         for (i = 0; i < device->brightness->count; i++) {
1644                 l = device->brightness->levels[i];
1645                 if (abs(l - level_current) < abs(delta)) {
1646                         delta = l - level_current;
1647                         if (!delta)
1648                                 break;
1649                 }
1650         }
1651         /* Ajust level_current to closest available level */
1652         level_current += delta;
1653         for (i = 0; i < device->brightness->count; i++) {
1654                 l = device->brightness->levels[i];
1655                 if (l < min)
1656                         min = l;
1657                 if (l > max)
1658                         max = l;
1659                 if (l < min_above && l > level_current)
1660                         min_above = l;
1661                 if (l > max_below && l < level_current)
1662                         max_below = l;
1663         }
1664
1665         switch (event) {
1666         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1667                 return (level_current < max) ? min_above : min;
1668         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1669                 return (level_current < max) ? min_above : max;
1670         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1671                 return (level_current > min) ? max_below : min;
1672         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1673         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1674                 return 0;
1675         default:
1676                 return level_current;
1677         }
1678 }
1679
1680 static void
1681 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1682 {
1683         unsigned long level_current, level_next;
1684         acpi_video_device_lcd_get_level_current(device, &level_current);
1685         level_next = acpi_video_get_next_level(device, level_current, event);
1686         acpi_video_device_lcd_set_level(device, level_next);
1687 }
1688
1689 static int
1690 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1691                            struct acpi_device *device)
1692 {
1693         int status = 0;
1694         struct list_head *node, *next;
1695
1696
1697         acpi_video_device_enumerate(video);
1698
1699         list_for_each_safe(node, next, &device->children) {
1700                 struct acpi_device *dev =
1701                     list_entry(node, struct acpi_device, node);
1702
1703                 if (!dev)
1704                         continue;
1705
1706                 status = acpi_video_bus_get_one_device(dev, video);
1707                 if (ACPI_FAILURE(status)) {
1708                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1709                         continue;
1710                 }
1711
1712         }
1713         return status;
1714 }
1715
1716 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1717 {
1718         acpi_status status;
1719         struct acpi_video_bus *video;
1720
1721
1722         if (!device || !device->video)
1723                 return -ENOENT;
1724
1725         video = device->video;
1726
1727         down(&video->sem);
1728         list_del(&device->entry);
1729         up(&video->sem);
1730         acpi_video_device_remove_fs(device->dev);
1731
1732         status = acpi_remove_notify_handler(device->dev->handle,
1733                                             ACPI_DEVICE_NOTIFY,
1734                                             acpi_video_device_notify);
1735         backlight_device_unregister(device->backlight);
1736         video_output_unregister(device->output_dev);
1737         return 0;
1738 }
1739
1740 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1741 {
1742         int status;
1743         struct list_head *node, *next;
1744
1745
1746         list_for_each_safe(node, next, &video->video_device_list) {
1747                 struct acpi_video_device *data =
1748                     list_entry(node, struct acpi_video_device, entry);
1749                 if (!data)
1750                         continue;
1751
1752                 status = acpi_video_bus_put_one_device(data);
1753                 if (ACPI_FAILURE(status))
1754                         printk(KERN_WARNING PREFIX
1755                                "hhuuhhuu bug in acpi video driver.\n");
1756
1757                 if (data->brightness)
1758                         kfree(data->brightness->levels);
1759                 kfree(data->brightness);
1760                 kfree(data);
1761         }
1762
1763         return 0;
1764 }
1765
1766 /* acpi_video interface */
1767
1768 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1769 {
1770         return acpi_video_bus_DOS(video, 0, 0);
1771 }
1772
1773 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1774 {
1775         return acpi_video_bus_DOS(video, 0, 1);
1776 }
1777
1778 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1779 {
1780         struct acpi_video_bus *video = data;
1781         struct acpi_device *device = NULL;
1782         struct input_dev *input;
1783         int keycode;
1784
1785
1786         printk("video bus notify\n");
1787
1788         if (!video)
1789                 return;
1790
1791         device = video->device;
1792         input = video->input;
1793
1794         switch (event) {
1795         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1796                                          * most likely via hotkey. */
1797                 acpi_bus_generate_proc_event(device, event, 0);
1798                 keycode = KEY_SWITCHVIDEOMODE;
1799                 break;
1800
1801         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1802                                          * connector. */
1803                 acpi_video_device_enumerate(video);
1804                 acpi_video_device_rebind(video);
1805                 acpi_video_switch_output(video, event);
1806                 acpi_bus_generate_proc_event(device, event, 0);
1807                 keycode = KEY_SWITCHVIDEOMODE;
1808                 break;
1809
1810         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1811                 acpi_video_switch_output(video, event);
1812                 acpi_bus_generate_proc_event(device, event, 0);
1813                 keycode = KEY_SWITCHVIDEOMODE;
1814                 break;
1815         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1816                 acpi_video_switch_output(video, event);
1817                 acpi_bus_generate_proc_event(device, event, 0);
1818                 keycode = KEY_VIDEO_NEXT;
1819                 break;
1820         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1821                 acpi_video_switch_output(video, event);
1822                 acpi_bus_generate_proc_event(device, event, 0);
1823                 keycode = KEY_VIDEO_PREV;
1824                 break;
1825
1826         default:
1827                 keycode = KEY_UNKNOWN;
1828                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1829                                   "Unsupported event [0x%x]\n", event));
1830                 break;
1831         }
1832
1833         input_report_key(input, keycode, 1);
1834         input_sync(input);
1835         input_report_key(input, keycode, 0);
1836         input_sync(input);
1837
1838         return;
1839 }
1840
1841 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1842 {
1843         struct acpi_video_device *video_device = data;
1844         struct acpi_device *device = NULL;
1845         struct acpi_video_bus *bus;
1846         struct input_dev *input;
1847         int keycode;
1848
1849         if (!video_device)
1850                 return;
1851
1852         device = video_device->dev;
1853         bus = video_device->video;
1854         input = bus->input;
1855
1856         switch (event) {
1857         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1858                 acpi_video_switch_brightness(video_device, event);
1859                 acpi_bus_generate_proc_event(device, event, 0);
1860                 keycode = KEY_BRIGHTNESS_CYCLE;
1861                 break;
1862         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1863                 acpi_video_switch_brightness(video_device, event);
1864                 acpi_bus_generate_proc_event(device, event, 0);
1865                 keycode = KEY_BRIGHTNESSUP;
1866                 break;
1867         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1868                 acpi_video_switch_brightness(video_device, event);
1869                 acpi_bus_generate_proc_event(device, event, 0);
1870                 keycode = KEY_BRIGHTNESSDOWN;
1871                 break;
1872         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1873                 acpi_video_switch_brightness(video_device, event);
1874                 acpi_bus_generate_proc_event(device, event, 0);
1875                 keycode = KEY_BRIGHTNESS_ZERO;
1876                 break;
1877         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1878                 acpi_video_switch_brightness(video_device, event);
1879                 acpi_bus_generate_proc_event(device, event, 0);
1880                 keycode = KEY_DISPLAY_OFF;
1881                 break;
1882         default:
1883                 keycode = KEY_UNKNOWN;
1884                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1885                                   "Unsupported event [0x%x]\n", event));
1886                 break;
1887         }
1888
1889         input_report_key(input, keycode, 1);
1890         input_sync(input);
1891         input_report_key(input, keycode, 0);
1892         input_sync(input);
1893
1894         return;
1895 }
1896
1897 static int instance;
1898 static int acpi_video_bus_add(struct acpi_device *device)
1899 {
1900         int result = 0;
1901         acpi_status status = 0;
1902         struct acpi_video_bus *video = NULL;
1903         struct input_dev *input;
1904
1905
1906         if (!device)
1907                 return -EINVAL;
1908
1909         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1910         if (!video)
1911                 return -ENOMEM;
1912
1913         /* a hack to fix the duplicate name "VID" problem on T61 */
1914         if (!strcmp(device->pnp.bus_id, "VID")) {
1915                 if (instance)
1916                         device->pnp.bus_id[3] = '0' + instance;
1917                 instance ++;
1918         }
1919
1920         video->device = device;
1921         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1922         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1923         acpi_driver_data(device) = video;
1924
1925         acpi_video_bus_find_cap(video);
1926         result = acpi_video_bus_check(video);
1927         if (result)
1928                 goto end;
1929
1930         result = acpi_video_bus_add_fs(device);
1931         if (result)
1932                 goto end;
1933
1934         init_MUTEX(&video->sem);
1935         INIT_LIST_HEAD(&video->video_device_list);
1936
1937         acpi_video_bus_get_devices(video, device);
1938         acpi_video_bus_start_devices(video);
1939
1940         status = acpi_install_notify_handler(device->handle,
1941                                              ACPI_DEVICE_NOTIFY,
1942                                              acpi_video_bus_notify, video);
1943         if (ACPI_FAILURE(status)) {
1944                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1945                                   "Error installing notify handler\n"));
1946                 acpi_video_bus_stop_devices(video);
1947                 acpi_video_bus_put_devices(video);
1948                 kfree(video->attached_array);
1949                 acpi_video_bus_remove_fs(device);
1950                 result = -ENODEV;
1951                 goto end;
1952         }
1953
1954
1955         video->input = input = input_allocate_device();
1956
1957         snprintf(video->phys, sizeof(video->phys),
1958                 "%s/video/input0", acpi_device_hid(video->device));
1959
1960         input->name = acpi_device_name(video->device);
1961         input->phys = video->phys;
1962         input->id.bustype = BUS_HOST;
1963         input->id.product = 0x06;
1964         input->evbit[0] = BIT(EV_KEY);
1965         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1966         set_bit(KEY_VIDEO_NEXT, input->keybit);
1967         set_bit(KEY_VIDEO_PREV, input->keybit);
1968         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1969         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1970         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1971         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1972         set_bit(KEY_DISPLAY_OFF, input->keybit);
1973         set_bit(KEY_UNKNOWN, input->keybit);
1974         result = input_register_device(input);
1975         if (result) {
1976                 acpi_remove_notify_handler(video->device->handle,
1977                                                 ACPI_DEVICE_NOTIFY,
1978                                                 acpi_video_bus_notify);
1979                 acpi_video_bus_stop_devices(video);
1980                 acpi_video_bus_put_devices(video);
1981                 kfree(video->attached_array);
1982                 acpi_video_bus_remove_fs(device);
1983                 goto end;
1984         }
1985
1986
1987         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1988                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1989                video->flags.multihead ? "yes" : "no",
1990                video->flags.rom ? "yes" : "no",
1991                video->flags.post ? "yes" : "no");
1992
1993       end:
1994         if (result)
1995                 kfree(video);
1996
1997         return result;
1998 }
1999
2000 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2001 {
2002         acpi_status status = 0;
2003         struct acpi_video_bus *video = NULL;
2004
2005
2006         if (!device || !acpi_driver_data(device))
2007                 return -EINVAL;
2008
2009         video = acpi_driver_data(device);
2010
2011         acpi_video_bus_stop_devices(video);
2012
2013         status = acpi_remove_notify_handler(video->device->handle,
2014                                             ACPI_DEVICE_NOTIFY,
2015                                             acpi_video_bus_notify);
2016
2017         acpi_video_bus_put_devices(video);
2018         acpi_video_bus_remove_fs(device);
2019
2020         input_unregister_device(video->input);
2021         kfree(video->attached_array);
2022         kfree(video);
2023
2024         return 0;
2025 }
2026
2027 static int __init acpi_video_init(void)
2028 {
2029         int result = 0;
2030
2031
2032         /*
2033            acpi_dbg_level = 0xFFFFFFFF;
2034            acpi_dbg_layer = 0x08000000;
2035          */
2036
2037         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2038         if (!acpi_video_dir)
2039                 return -ENODEV;
2040         acpi_video_dir->owner = THIS_MODULE;
2041
2042         result = acpi_bus_register_driver(&acpi_video_bus);
2043         if (result < 0) {
2044                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2045                 return -ENODEV;
2046         }
2047
2048         return 0;
2049 }
2050
2051 static void __exit acpi_video_exit(void)
2052 {
2053
2054         acpi_bus_unregister_driver(&acpi_video_bus);
2055
2056         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2057
2058         return;
2059 }
2060
2061 module_init(acpi_video_init);
2062 module_exit(acpi_video_exit);