[PATCH] PATCH: usb-storage: move GetMaxLUN later in time
[linux-2.6] / drivers / acpi / video.c
1 /*
2  *  video.c - ACPI Video Driver ($Revision:$)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6  *
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         acpi_handle handle;
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         acpi_handle handle;
159         unsigned long device_id;
160         struct acpi_video_device_flags flags;
161         struct acpi_video_device_cap cap;
162         struct list_head entry;
163         struct acpi_video_bus *video;
164         struct acpi_device *dev;
165         struct acpi_video_device_brightness *brightness;
166 };
167
168 /* bus */
169 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
170 static struct file_operations acpi_video_bus_info_fops = {
171         .open = acpi_video_bus_info_open_fs,
172         .read = seq_read,
173         .llseek = seq_lseek,
174         .release = single_release,
175 };
176
177 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
178 static struct file_operations acpi_video_bus_ROM_fops = {
179         .open = acpi_video_bus_ROM_open_fs,
180         .read = seq_read,
181         .llseek = seq_lseek,
182         .release = single_release,
183 };
184
185 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
186                                             struct file *file);
187 static struct file_operations acpi_video_bus_POST_info_fops = {
188         .open = acpi_video_bus_POST_info_open_fs,
189         .read = seq_read,
190         .llseek = seq_lseek,
191         .release = single_release,
192 };
193
194 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
195 static struct file_operations acpi_video_bus_POST_fops = {
196         .open = acpi_video_bus_POST_open_fs,
197         .read = seq_read,
198         .llseek = seq_lseek,
199         .release = single_release,
200 };
201
202 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
203 static struct file_operations acpi_video_bus_DOS_fops = {
204         .open = acpi_video_bus_DOS_open_fs,
205         .read = seq_read,
206         .llseek = seq_lseek,
207         .release = single_release,
208 };
209
210 /* device */
211 static int acpi_video_device_info_open_fs(struct inode *inode,
212                                           struct file *file);
213 static struct file_operations acpi_video_device_info_fops = {
214         .open = acpi_video_device_info_open_fs,
215         .read = seq_read,
216         .llseek = seq_lseek,
217         .release = single_release,
218 };
219
220 static int acpi_video_device_state_open_fs(struct inode *inode,
221                                            struct file *file);
222 static struct file_operations acpi_video_device_state_fops = {
223         .open = acpi_video_device_state_open_fs,
224         .read = seq_read,
225         .llseek = seq_lseek,
226         .release = single_release,
227 };
228
229 static int acpi_video_device_brightness_open_fs(struct inode *inode,
230                                                 struct file *file);
231 static struct file_operations acpi_video_device_brightness_fops = {
232         .open = acpi_video_device_brightness_open_fs,
233         .read = seq_read,
234         .llseek = seq_lseek,
235         .release = single_release,
236 };
237
238 static int acpi_video_device_EDID_open_fs(struct inode *inode,
239                                           struct file *file);
240 static struct file_operations acpi_video_device_EDID_fops = {
241         .open = acpi_video_device_EDID_open_fs,
242         .read = seq_read,
243         .llseek = seq_lseek,
244         .release = single_release,
245 };
246
247 static char device_decode[][30] = {
248         "motherboard VGA device",
249         "PCI VGA device",
250         "AGP VGA device",
251         "UNKNOWN",
252 };
253
254 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
255 static void acpi_video_device_rebind(struct acpi_video_bus *video);
256 static void acpi_video_device_bind(struct acpi_video_bus *video,
257                                    struct acpi_video_device *device);
258 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
259 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
260 static int acpi_video_get_next_level(struct acpi_video_device *device,
261                                      u32 level_current, u32 event);
262 static void acpi_video_switch_brightness(struct acpi_video_device *device,
263                                          int event);
264
265 /* --------------------------------------------------------------------------
266                                Video Management
267    -------------------------------------------------------------------------- */
268
269 /* device */
270
271 static int
272 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
273 {
274         int status;
275         ACPI_FUNCTION_TRACE("acpi_video_device_query");
276         status = acpi_evaluate_integer(device->handle, "_DGS", NULL, state);
277
278         return_VALUE(status);
279 }
280
281 static int
282 acpi_video_device_get_state(struct acpi_video_device *device,
283                             unsigned long *state)
284 {
285         int status;
286
287         ACPI_FUNCTION_TRACE("acpi_video_device_get_state");
288
289         status = acpi_evaluate_integer(device->handle, "_DCS", NULL, state);
290
291         return_VALUE(status);
292 }
293
294 static int
295 acpi_video_device_set_state(struct acpi_video_device *device, int state)
296 {
297         int status;
298         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
299         struct acpi_object_list args = { 1, &arg0 };
300         unsigned long ret;
301
302         ACPI_FUNCTION_TRACE("acpi_video_device_set_state");
303
304         arg0.integer.value = state;
305         status = acpi_evaluate_integer(device->handle, "_DSS", &args, &ret);
306
307         return_VALUE(status);
308 }
309
310 static int
311 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
312                                    union acpi_object **levels)
313 {
314         int status;
315         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
316         union acpi_object *obj;
317
318         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_query_levels");
319
320         *levels = NULL;
321
322         status = acpi_evaluate_object(device->handle, "_BCL", NULL, &buffer);
323         if (!ACPI_SUCCESS(status))
324                 return_VALUE(status);
325         obj = (union acpi_object *)buffer.pointer;
326         if (!obj && (obj->type != ACPI_TYPE_PACKAGE)) {
327                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _BCL data\n"));
328                 status = -EFAULT;
329                 goto err;
330         }
331
332         *levels = obj;
333
334         return_VALUE(0);
335
336       err:
337         if (buffer.pointer)
338                 kfree(buffer.pointer);
339
340         return_VALUE(status);
341 }
342
343 static int
344 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
345 {
346         int status;
347         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
348         struct acpi_object_list args = { 1, &arg0 };
349
350         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_set_level");
351
352         arg0.integer.value = level;
353         status = acpi_evaluate_object(device->handle, "_BCM", &args, NULL);
354
355         printk(KERN_DEBUG "set_level status: %x\n", status);
356         return_VALUE(status);
357 }
358
359 static int
360 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
361                                         unsigned long *level)
362 {
363         int status;
364         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_get_level_current");
365
366         status = acpi_evaluate_integer(device->handle, "_BQC", NULL, level);
367
368         return_VALUE(status);
369 }
370
371 static int
372 acpi_video_device_EDID(struct acpi_video_device *device,
373                        union acpi_object **edid, ssize_t length)
374 {
375         int status;
376         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
377         union acpi_object *obj;
378         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
379         struct acpi_object_list args = { 1, &arg0 };
380
381         ACPI_FUNCTION_TRACE("acpi_video_device_get_EDID");
382
383         *edid = NULL;
384
385         if (!device)
386                 return_VALUE(-ENODEV);
387         if (length == 128)
388                 arg0.integer.value = 1;
389         else if (length == 256)
390                 arg0.integer.value = 2;
391         else
392                 return_VALUE(-EINVAL);
393
394         status = acpi_evaluate_object(device->handle, "_DDC", &args, &buffer);
395         if (ACPI_FAILURE(status))
396                 return_VALUE(-ENODEV);
397
398         obj = (union acpi_object *)buffer.pointer;
399
400         if (obj && obj->type == ACPI_TYPE_BUFFER)
401                 *edid = obj;
402         else {
403                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DDC data\n"));
404                 status = -EFAULT;
405                 kfree(obj);
406         }
407
408         return_VALUE(status);
409 }
410
411 /* bus */
412
413 static int
414 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
415 {
416         int status;
417         unsigned long tmp;
418         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
419         struct acpi_object_list args = { 1, &arg0 };
420
421         ACPI_FUNCTION_TRACE("acpi_video_bus_set_POST");
422
423         arg0.integer.value = option;
424
425         status = acpi_evaluate_integer(video->handle, "_SPD", &args, &tmp);
426         if (ACPI_SUCCESS(status))
427                 status = tmp ? (-EINVAL) : (AE_OK);
428
429         return_VALUE(status);
430 }
431
432 static int
433 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
434 {
435         int status;
436
437         ACPI_FUNCTION_TRACE("acpi_video_bus_get_POST");
438
439         status = acpi_evaluate_integer(video->handle, "_GPD", NULL, id);
440
441         return_VALUE(status);
442 }
443
444 static int
445 acpi_video_bus_POST_options(struct acpi_video_bus *video,
446                             unsigned long *options)
447 {
448         int status;
449         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_options");
450
451         status = acpi_evaluate_integer(video->handle, "_VPO", NULL, options);
452         *options &= 3;
453
454         return_VALUE(status);
455 }
456
457 /*
458  *  Arg:
459  *      video           : video bus device pointer
460  *      bios_flag       : 
461  *              0.      The system BIOS should NOT automatically switch(toggle)
462  *                      the active display output.
463  *              1.      The system BIOS should automatically switch (toggle) the
464  *                      active display output. No swich event.
465  *              2.      The _DGS value should be locked.
466  *              3.      The system BIOS should not automatically switch (toggle) the
467  *                      active display output, but instead generate the display switch
468  *                      event notify code.
469  *      lcd_flag        :
470  *              0.      The system BIOS should automatically control the brightness level
471  *                      of the LCD, when the power changes from AC to DC
472  *              1.      The system BIOS should NOT automatically control the brightness 
473  *                      level of the LCD, when the power changes from AC to DC.
474  * Return Value:
475  *              -1      wrong arg.
476  */
477
478 static int
479 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
480 {
481         acpi_integer status = 0;
482         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
483         struct acpi_object_list args = { 1, &arg0 };
484
485         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS");
486
487         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
488                 status = -1;
489                 goto Failed;
490         }
491         arg0.integer.value = (lcd_flag << 2) | bios_flag;
492         video->dos_setting = arg0.integer.value;
493         acpi_evaluate_object(video->handle, "_DOS", &args, NULL);
494
495       Failed:
496         return_VALUE(status);
497 }
498
499 /*
500  *  Arg:        
501  *      device  : video output device (LCD, CRT, ..)
502  *
503  *  Return Value:
504  *      None
505  *
506  *  Find out all required AML method defined under the output
507  *  device.
508  */
509
510 static void acpi_video_device_find_cap(struct acpi_video_device *device)
511 {
512         acpi_integer status;
513         acpi_handle h_dummy1;
514         int i;
515         union acpi_object *obj = NULL;
516         struct acpi_video_device_brightness *br = NULL;
517
518         ACPI_FUNCTION_TRACE("acpi_video_device_find_cap");
519
520         memset(&device->cap, 0, 4);
521
522         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ADR", &h_dummy1))) {
523                 device->cap._ADR = 1;
524         }
525         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCL", &h_dummy1))) {
526                 device->cap._BCL = 1;
527         }
528         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCM", &h_dummy1))) {
529                 device->cap._BCM = 1;
530         }
531         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DDC", &h_dummy1))) {
532                 device->cap._DDC = 1;
533         }
534         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DCS", &h_dummy1))) {
535                 device->cap._DCS = 1;
536         }
537         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DGS", &h_dummy1))) {
538                 device->cap._DGS = 1;
539         }
540         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DSS", &h_dummy1))) {
541                 device->cap._DSS = 1;
542         }
543
544         status = acpi_video_device_lcd_query_levels(device, &obj);
545
546         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
547                 int count = 0;
548                 union acpi_object *o;
549
550                 br = kmalloc(sizeof(*br), GFP_KERNEL);
551                 if (!br) {
552                         printk(KERN_ERR "can't allocate memory\n");
553                 } else {
554                         memset(br, 0, sizeof(*br));
555                         br->levels = kmalloc(obj->package.count *
556                                              sizeof *(br->levels), GFP_KERNEL);
557                         if (!br->levels)
558                                 goto out;
559
560                         for (i = 0; i < obj->package.count; i++) {
561                                 o = (union acpi_object *)&obj->package.
562                                     elements[i];
563                                 if (o->type != ACPI_TYPE_INTEGER) {
564                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
565                                                           "Invalid data\n"));
566                                         continue;
567                                 }
568                                 br->levels[count] = (u32) o->integer.value;
569                                 count++;
570                         }
571                       out:
572                         if (count < 2) {
573                                 kfree(br->levels);
574                                 kfree(br);
575                         } else {
576                                 br->count = count;
577                                 device->brightness = br;
578                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
579                                                   "found %d brightness levels\n",
580                                                   count));
581                         }
582                 }
583         }
584
585         kfree(obj);
586
587         return_VOID;
588 }
589
590 /*
591  *  Arg:        
592  *      device  : video output device (VGA)
593  *
594  *  Return Value:
595  *      None
596  *
597  *  Find out all required AML method defined under the video bus device.
598  */
599
600 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
601 {
602         acpi_handle h_dummy1;
603
604         memset(&video->cap, 0, 4);
605         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOS", &h_dummy1))) {
606                 video->cap._DOS = 1;
607         }
608         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOD", &h_dummy1))) {
609                 video->cap._DOD = 1;
610         }
611         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_ROM", &h_dummy1))) {
612                 video->cap._ROM = 1;
613         }
614         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_GPD", &h_dummy1))) {
615                 video->cap._GPD = 1;
616         }
617         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_SPD", &h_dummy1))) {
618                 video->cap._SPD = 1;
619         }
620         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_VPO", &h_dummy1))) {
621                 video->cap._VPO = 1;
622         }
623 }
624
625 /*
626  * Check whether the video bus device has required AML method to
627  * support the desired features
628  */
629
630 static int acpi_video_bus_check(struct acpi_video_bus *video)
631 {
632         acpi_status status = -ENOENT;
633
634         ACPI_FUNCTION_TRACE("acpi_video_bus_check");
635
636         if (!video)
637                 return_VALUE(-EINVAL);
638
639         /* Since there is no HID, CID and so on for VGA driver, we have
640          * to check well known required nodes.
641          */
642
643         /* Does this device able to support video switching ? */
644         if (video->cap._DOS) {
645                 video->flags.multihead = 1;
646                 status = 0;
647         }
648
649         /* Does this device able to retrieve a retrieve a video ROM ? */
650         if (video->cap._ROM) {
651                 video->flags.rom = 1;
652                 status = 0;
653         }
654
655         /* Does this device able to configure which video device to POST ? */
656         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
657                 video->flags.post = 1;
658                 status = 0;
659         }
660
661         return_VALUE(status);
662 }
663
664 /* --------------------------------------------------------------------------
665                               FS Interface (/proc)
666    -------------------------------------------------------------------------- */
667
668 static struct proc_dir_entry *acpi_video_dir;
669
670 /* video devices */
671
672 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
673 {
674         struct acpi_video_device *dev =
675             (struct acpi_video_device *)seq->private;
676
677         ACPI_FUNCTION_TRACE("acpi_video_device_info_seq_show");
678
679         if (!dev)
680                 goto end;
681
682         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
683         seq_printf(seq, "type:         ");
684         if (dev->flags.crt)
685                 seq_printf(seq, "CRT\n");
686         else if (dev->flags.lcd)
687                 seq_printf(seq, "LCD\n");
688         else if (dev->flags.tvout)
689                 seq_printf(seq, "TVOUT\n");
690         else
691                 seq_printf(seq, "UNKNOWN\n");
692
693         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
694
695       end:
696         return_VALUE(0);
697 }
698
699 static int
700 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
701 {
702         return single_open(file, acpi_video_device_info_seq_show,
703                            PDE(inode)->data);
704 }
705
706 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
707 {
708         int status;
709         struct acpi_video_device *dev =
710             (struct acpi_video_device *)seq->private;
711         unsigned long state;
712
713         ACPI_FUNCTION_TRACE("acpi_video_device_state_seq_show");
714
715         if (!dev)
716                 goto end;
717
718         status = acpi_video_device_get_state(dev, &state);
719         seq_printf(seq, "state:     ");
720         if (ACPI_SUCCESS(status))
721                 seq_printf(seq, "0x%02lx\n", state);
722         else
723                 seq_printf(seq, "<not supported>\n");
724
725         status = acpi_video_device_query(dev, &state);
726         seq_printf(seq, "query:     ");
727         if (ACPI_SUCCESS(status))
728                 seq_printf(seq, "0x%02lx\n", state);
729         else
730                 seq_printf(seq, "<not supported>\n");
731
732       end:
733         return_VALUE(0);
734 }
735
736 static int
737 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
738 {
739         return single_open(file, acpi_video_device_state_seq_show,
740                            PDE(inode)->data);
741 }
742
743 static ssize_t
744 acpi_video_device_write_state(struct file *file,
745                               const char __user * buffer,
746                               size_t count, loff_t * data)
747 {
748         int status;
749         struct seq_file *m = (struct seq_file *)file->private_data;
750         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
751         char str[12] = { 0 };
752         u32 state = 0;
753
754         ACPI_FUNCTION_TRACE("acpi_video_device_write_state");
755
756         if (!dev || count + 1 > sizeof str)
757                 return_VALUE(-EINVAL);
758
759         if (copy_from_user(str, buffer, count))
760                 return_VALUE(-EFAULT);
761
762         str[count] = 0;
763         state = simple_strtoul(str, NULL, 0);
764         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
765
766         status = acpi_video_device_set_state(dev, state);
767
768         if (status)
769                 return_VALUE(-EFAULT);
770
771         return_VALUE(count);
772 }
773
774 static int
775 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
776 {
777         struct acpi_video_device *dev =
778             (struct acpi_video_device *)seq->private;
779         int i;
780
781         ACPI_FUNCTION_TRACE("acpi_video_device_brightness_seq_show");
782
783         if (!dev || !dev->brightness) {
784                 seq_printf(seq, "<not supported>\n");
785                 return_VALUE(0);
786         }
787
788         seq_printf(seq, "levels: ");
789         for (i = 0; i < dev->brightness->count; i++)
790                 seq_printf(seq, " %d", dev->brightness->levels[i]);
791         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
792
793         return_VALUE(0);
794 }
795
796 static int
797 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
798 {
799         return single_open(file, acpi_video_device_brightness_seq_show,
800                            PDE(inode)->data);
801 }
802
803 static ssize_t
804 acpi_video_device_write_brightness(struct file *file,
805                                    const char __user * buffer,
806                                    size_t count, loff_t * data)
807 {
808         struct seq_file *m = (struct seq_file *)file->private_data;
809         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
810         char str[4] = { 0 };
811         unsigned int level = 0;
812         int i;
813
814         ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
815
816         if (!dev || count + 1 > sizeof str)
817                 return_VALUE(-EINVAL);
818
819         if (copy_from_user(str, buffer, count))
820                 return_VALUE(-EFAULT);
821
822         str[count] = 0;
823         level = simple_strtoul(str, NULL, 0);
824
825         if (level > 100)
826                 return_VALUE(-EFAULT);
827
828         /* validate though the list of available levels */
829         for (i = 0; i < dev->brightness->count; i++)
830                 if (level == dev->brightness->levels[i]) {
831                         if (ACPI_SUCCESS
832                             (acpi_video_device_lcd_set_level(dev, level)))
833                                 dev->brightness->curr = level;
834                         break;
835                 }
836
837         return_VALUE(count);
838 }
839
840 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
841 {
842         struct acpi_video_device *dev =
843             (struct acpi_video_device *)seq->private;
844         int status;
845         int i;
846         union acpi_object *edid = NULL;
847
848         ACPI_FUNCTION_TRACE("acpi_video_device_EDID_seq_show");
849
850         if (!dev)
851                 goto out;
852
853         status = acpi_video_device_EDID(dev, &edid, 128);
854         if (ACPI_FAILURE(status)) {
855                 status = acpi_video_device_EDID(dev, &edid, 256);
856         }
857
858         if (ACPI_FAILURE(status)) {
859                 goto out;
860         }
861
862         if (edid && edid->type == ACPI_TYPE_BUFFER) {
863                 for (i = 0; i < edid->buffer.length; i++)
864                         seq_putc(seq, edid->buffer.pointer[i]);
865         }
866
867       out:
868         if (!edid)
869                 seq_printf(seq, "<not supported>\n");
870         else
871                 kfree(edid);
872
873         return_VALUE(0);
874 }
875
876 static int
877 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
878 {
879         return single_open(file, acpi_video_device_EDID_seq_show,
880                            PDE(inode)->data);
881 }
882
883 static int acpi_video_device_add_fs(struct acpi_device *device)
884 {
885         struct proc_dir_entry *entry = NULL;
886         struct acpi_video_device *vid_dev;
887
888         ACPI_FUNCTION_TRACE("acpi_video_device_add_fs");
889
890         if (!device)
891                 return_VALUE(-ENODEV);
892
893         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
894         if (!vid_dev)
895                 return_VALUE(-ENODEV);
896
897         if (!acpi_device_dir(device)) {
898                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
899                                                      vid_dev->video->dir);
900                 if (!acpi_device_dir(device))
901                         return_VALUE(-ENODEV);
902                 acpi_device_dir(device)->owner = THIS_MODULE;
903         }
904
905         /* 'info' [R] */
906         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
907         if (!entry)
908                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
909                                   "Unable to create 'info' fs entry\n"));
910         else {
911                 entry->proc_fops = &acpi_video_device_info_fops;
912                 entry->data = acpi_driver_data(device);
913                 entry->owner = THIS_MODULE;
914         }
915
916         /* 'state' [R/W] */
917         entry =
918             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
919                               acpi_device_dir(device));
920         if (!entry)
921                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
922                                   "Unable to create 'state' fs entry\n"));
923         else {
924                 entry->proc_fops = &acpi_video_device_state_fops;
925                 entry->proc_fops->write = acpi_video_device_write_state;
926                 entry->data = acpi_driver_data(device);
927                 entry->owner = THIS_MODULE;
928         }
929
930         /* 'brightness' [R/W] */
931         entry =
932             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
933                               acpi_device_dir(device));
934         if (!entry)
935                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
936                                   "Unable to create 'brightness' fs entry\n"));
937         else {
938                 entry->proc_fops = &acpi_video_device_brightness_fops;
939                 entry->proc_fops->write = acpi_video_device_write_brightness;
940                 entry->data = acpi_driver_data(device);
941                 entry->owner = THIS_MODULE;
942         }
943
944         /* 'EDID' [R] */
945         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
946         if (!entry)
947                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
948                                   "Unable to create 'brightness' fs entry\n"));
949         else {
950                 entry->proc_fops = &acpi_video_device_EDID_fops;
951                 entry->data = acpi_driver_data(device);
952                 entry->owner = THIS_MODULE;
953         }
954
955         return_VALUE(0);
956 }
957
958 static int acpi_video_device_remove_fs(struct acpi_device *device)
959 {
960         struct acpi_video_device *vid_dev;
961         ACPI_FUNCTION_TRACE("acpi_video_device_remove_fs");
962
963         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
964         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
965                 return_VALUE(-ENODEV);
966
967         if (acpi_device_dir(device)) {
968                 remove_proc_entry("info", acpi_device_dir(device));
969                 remove_proc_entry("state", acpi_device_dir(device));
970                 remove_proc_entry("brightness", acpi_device_dir(device));
971                 remove_proc_entry("EDID", acpi_device_dir(device));
972                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
973                 acpi_device_dir(device) = NULL;
974         }
975
976         return_VALUE(0);
977 }
978
979 /* video bus */
980 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
981 {
982         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
983
984         ACPI_FUNCTION_TRACE("acpi_video_bus_info_seq_show");
985
986         if (!video)
987                 goto end;
988
989         seq_printf(seq, "Switching heads:              %s\n",
990                    video->flags.multihead ? "yes" : "no");
991         seq_printf(seq, "Video ROM:                    %s\n",
992                    video->flags.rom ? "yes" : "no");
993         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
994                    video->flags.post ? "yes" : "no");
995
996       end:
997         return_VALUE(0);
998 }
999
1000 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1001 {
1002         return single_open(file, acpi_video_bus_info_seq_show,
1003                            PDE(inode)->data);
1004 }
1005
1006 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1007 {
1008         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1009
1010         ACPI_FUNCTION_TRACE("acpi_video_bus_ROM_seq_show");
1011
1012         if (!video)
1013                 goto end;
1014
1015         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1016         seq_printf(seq, "<TODO>\n");
1017
1018       end:
1019         return_VALUE(0);
1020 }
1021
1022 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1023 {
1024         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1025 }
1026
1027 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1028 {
1029         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1030         unsigned long options;
1031         int status;
1032
1033         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_info_seq_show");
1034
1035         if (!video)
1036                 goto end;
1037
1038         status = acpi_video_bus_POST_options(video, &options);
1039         if (ACPI_SUCCESS(status)) {
1040                 if (!(options & 1)) {
1041                         printk(KERN_WARNING PREFIX
1042                                "The motherboard VGA device is not listed as a possible POST device.\n");
1043                         printk(KERN_WARNING PREFIX
1044                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1045                 }
1046                 printk("%lx\n", options);
1047                 seq_printf(seq, "can POST: <intgrated video>");
1048                 if (options & 2)
1049                         seq_printf(seq, " <PCI video>");
1050                 if (options & 4)
1051                         seq_printf(seq, " <AGP video>");
1052                 seq_putc(seq, '\n');
1053         } else
1054                 seq_printf(seq, "<not supported>\n");
1055       end:
1056         return_VALUE(0);
1057 }
1058
1059 static int
1060 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1061 {
1062         return single_open(file, acpi_video_bus_POST_info_seq_show,
1063                            PDE(inode)->data);
1064 }
1065
1066 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1067 {
1068         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1069         int status;
1070         unsigned long id;
1071
1072         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_seq_show");
1073
1074         if (!video)
1075                 goto end;
1076
1077         status = acpi_video_bus_get_POST(video, &id);
1078         if (!ACPI_SUCCESS(status)) {
1079                 seq_printf(seq, "<not supported>\n");
1080                 goto end;
1081         }
1082         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1083
1084       end:
1085         return_VALUE(0);
1086 }
1087
1088 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1089 {
1090         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1091
1092         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS_seq_show");
1093
1094         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1095
1096         return_VALUE(0);
1097 }
1098
1099 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1100 {
1101         return single_open(file, acpi_video_bus_POST_seq_show,
1102                            PDE(inode)->data);
1103 }
1104
1105 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1106 {
1107         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1108 }
1109
1110 static ssize_t
1111 acpi_video_bus_write_POST(struct file *file,
1112                           const char __user * buffer,
1113                           size_t count, loff_t * data)
1114 {
1115         int status;
1116         struct seq_file *m = (struct seq_file *)file->private_data;
1117         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1118         char str[12] = { 0 };
1119         unsigned long opt, options;
1120
1121         ACPI_FUNCTION_TRACE("acpi_video_bus_write_POST");
1122
1123         if (!video || count + 1 > sizeof str)
1124                 return_VALUE(-EINVAL);
1125
1126         status = acpi_video_bus_POST_options(video, &options);
1127         if (!ACPI_SUCCESS(status))
1128                 return_VALUE(-EINVAL);
1129
1130         if (copy_from_user(str, buffer, count))
1131                 return_VALUE(-EFAULT);
1132
1133         str[count] = 0;
1134         opt = strtoul(str, NULL, 0);
1135         if (opt > 3)
1136                 return_VALUE(-EFAULT);
1137
1138         /* just in case an OEM 'forget' the motherboard... */
1139         options |= 1;
1140
1141         if (options & (1ul << opt)) {
1142                 status = acpi_video_bus_set_POST(video, opt);
1143                 if (!ACPI_SUCCESS(status))
1144                         return_VALUE(-EFAULT);
1145
1146         }
1147
1148         return_VALUE(count);
1149 }
1150
1151 static ssize_t
1152 acpi_video_bus_write_DOS(struct file *file,
1153                          const char __user * buffer,
1154                          size_t count, loff_t * data)
1155 {
1156         int status;
1157         struct seq_file *m = (struct seq_file *)file->private_data;
1158         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1159         char str[12] = { 0 };
1160         unsigned long opt;
1161
1162         ACPI_FUNCTION_TRACE("acpi_video_bus_write_DOS");
1163
1164         if (!video || count + 1 > sizeof str)
1165                 return_VALUE(-EINVAL);
1166
1167         if (copy_from_user(str, buffer, count))
1168                 return_VALUE(-EFAULT);
1169
1170         str[count] = 0;
1171         opt = strtoul(str, NULL, 0);
1172         if (opt > 7)
1173                 return_VALUE(-EFAULT);
1174
1175         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1176
1177         if (!ACPI_SUCCESS(status))
1178                 return_VALUE(-EFAULT);
1179
1180         return_VALUE(count);
1181 }
1182
1183 static int acpi_video_bus_add_fs(struct acpi_device *device)
1184 {
1185         struct proc_dir_entry *entry = NULL;
1186         struct acpi_video_bus *video;
1187
1188         ACPI_FUNCTION_TRACE("acpi_video_bus_add_fs");
1189
1190         video = (struct acpi_video_bus *)acpi_driver_data(device);
1191
1192         if (!acpi_device_dir(device)) {
1193                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1194                                                      acpi_video_dir);
1195                 if (!acpi_device_dir(device))
1196                         return_VALUE(-ENODEV);
1197                 video->dir = acpi_device_dir(device);
1198                 acpi_device_dir(device)->owner = THIS_MODULE;
1199         }
1200
1201         /* 'info' [R] */
1202         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1203         if (!entry)
1204                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1205                                   "Unable to create 'info' fs entry\n"));
1206         else {
1207                 entry->proc_fops = &acpi_video_bus_info_fops;
1208                 entry->data = acpi_driver_data(device);
1209                 entry->owner = THIS_MODULE;
1210         }
1211
1212         /* 'ROM' [R] */
1213         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1214         if (!entry)
1215                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1216                                   "Unable to create 'ROM' fs entry\n"));
1217         else {
1218                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1219                 entry->data = acpi_driver_data(device);
1220                 entry->owner = THIS_MODULE;
1221         }
1222
1223         /* 'POST_info' [R] */
1224         entry =
1225             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1226         if (!entry)
1227                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1228                                   "Unable to create 'POST_info' fs entry\n"));
1229         else {
1230                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1231                 entry->data = acpi_driver_data(device);
1232                 entry->owner = THIS_MODULE;
1233         }
1234
1235         /* 'POST' [R/W] */
1236         entry =
1237             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1238                               acpi_device_dir(device));
1239         if (!entry)
1240                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1241                                   "Unable to create 'POST' fs entry\n"));
1242         else {
1243                 entry->proc_fops = &acpi_video_bus_POST_fops;
1244                 entry->proc_fops->write = acpi_video_bus_write_POST;
1245                 entry->data = acpi_driver_data(device);
1246                 entry->owner = THIS_MODULE;
1247         }
1248
1249         /* 'DOS' [R/W] */
1250         entry =
1251             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1252                               acpi_device_dir(device));
1253         if (!entry)
1254                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1255                                   "Unable to create 'DOS' fs entry\n"));
1256         else {
1257                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1258                 entry->proc_fops->write = acpi_video_bus_write_DOS;
1259                 entry->data = acpi_driver_data(device);
1260                 entry->owner = THIS_MODULE;
1261         }
1262
1263         return_VALUE(0);
1264 }
1265
1266 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1267 {
1268         struct acpi_video_bus *video;
1269
1270         ACPI_FUNCTION_TRACE("acpi_video_bus_remove_fs");
1271
1272         video = (struct acpi_video_bus *)acpi_driver_data(device);
1273
1274         if (acpi_device_dir(device)) {
1275                 remove_proc_entry("info", acpi_device_dir(device));
1276                 remove_proc_entry("ROM", acpi_device_dir(device));
1277                 remove_proc_entry("POST_info", acpi_device_dir(device));
1278                 remove_proc_entry("POST", acpi_device_dir(device));
1279                 remove_proc_entry("DOS", acpi_device_dir(device));
1280                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1281                 acpi_device_dir(device) = NULL;
1282         }
1283
1284         return_VALUE(0);
1285 }
1286
1287 /* --------------------------------------------------------------------------
1288                                  Driver Interface
1289    -------------------------------------------------------------------------- */
1290
1291 /* device interface */
1292
1293 static int
1294 acpi_video_bus_get_one_device(struct acpi_device *device,
1295                               struct acpi_video_bus *video)
1296 {
1297         unsigned long device_id;
1298         int status, result;
1299         struct acpi_video_device *data;
1300
1301         ACPI_FUNCTION_TRACE("acpi_video_bus_get_one_device");
1302
1303         if (!device || !video)
1304                 return_VALUE(-EINVAL);
1305
1306         status =
1307             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1308         if (ACPI_SUCCESS(status)) {
1309
1310                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1311                 if (!data)
1312                         return_VALUE(-ENOMEM);
1313
1314                 memset(data, 0, sizeof(struct acpi_video_device));
1315
1316                 data->handle = device->handle;
1317                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1318                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1319                 acpi_driver_data(device) = data;
1320
1321                 data->device_id = device_id;
1322                 data->video = video;
1323                 data->dev = device;
1324
1325                 switch (device_id & 0xffff) {
1326                 case 0x0100:
1327                         data->flags.crt = 1;
1328                         break;
1329                 case 0x0400:
1330                         data->flags.lcd = 1;
1331                         break;
1332                 case 0x0200:
1333                         data->flags.tvout = 1;
1334                         break;
1335                 default:
1336                         data->flags.unknown = 1;
1337                         break;
1338                 }
1339
1340                 acpi_video_device_bind(video, data);
1341                 acpi_video_device_find_cap(data);
1342
1343                 status = acpi_install_notify_handler(data->handle,
1344                                                      ACPI_DEVICE_NOTIFY,
1345                                                      acpi_video_device_notify,
1346                                                      data);
1347                 if (ACPI_FAILURE(status)) {
1348                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1349                                           "Error installing notify handler\n"));
1350                         result = -ENODEV;
1351                         goto end;
1352                 }
1353
1354                 down(&video->sem);
1355                 list_add_tail(&data->entry, &video->video_device_list);
1356                 up(&video->sem);
1357
1358                 acpi_video_device_add_fs(device);
1359
1360                 return_VALUE(0);
1361         }
1362
1363       end:
1364         return_VALUE(-ENOENT);
1365 }
1366
1367 /*
1368  *  Arg:
1369  *      video   : video bus device 
1370  *
1371  *  Return:
1372  *      none
1373  *  
1374  *  Enumerate the video device list of the video bus, 
1375  *  bind the ids with the corresponding video devices
1376  *  under the video bus.
1377  */
1378
1379 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1380 {
1381         struct list_head *node, *next;
1382         list_for_each_safe(node, next, &video->video_device_list) {
1383                 struct acpi_video_device *dev =
1384                     container_of(node, struct acpi_video_device, entry);
1385                 acpi_video_device_bind(video, dev);
1386         }
1387 }
1388
1389 /*
1390  *  Arg:
1391  *      video   : video bus device 
1392  *      device  : video output device under the video 
1393  *              bus
1394  *
1395  *  Return:
1396  *      none
1397  *  
1398  *  Bind the ids with the corresponding video devices
1399  *  under the video bus.
1400  */
1401
1402 static void
1403 acpi_video_device_bind(struct acpi_video_bus *video,
1404                        struct acpi_video_device *device)
1405 {
1406         int i;
1407         ACPI_FUNCTION_TRACE("acpi_video_device_bind");
1408
1409 #define IDS_VAL(i) video->attached_array[i].value.int_val
1410 #define IDS_BIND(i) video->attached_array[i].bind_info
1411
1412         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1413              i < video->attached_count; i++) {
1414                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1415                         IDS_BIND(i) = device;
1416                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1417                 }
1418         }
1419 #undef IDS_VAL
1420 #undef IDS_BIND
1421 }
1422
1423 /*
1424  *  Arg:
1425  *      video   : video bus device 
1426  *
1427  *  Return:
1428  *      < 0     : error
1429  *  
1430  *  Call _DOD to enumerate all devices attached to display adapter
1431  *
1432  */
1433
1434 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1435 {
1436         int status;
1437         int count;
1438         int i;
1439         struct acpi_video_enumerated_device *active_device_list;
1440         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1441         union acpi_object *dod = NULL;
1442         union acpi_object *obj;
1443
1444         ACPI_FUNCTION_TRACE("acpi_video_device_enumerate");
1445
1446         status = acpi_evaluate_object(video->handle, "_DOD", NULL, &buffer);
1447         if (!ACPI_SUCCESS(status)) {
1448                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _DOD\n"));
1449                 return_VALUE(status);
1450         }
1451
1452         dod = (union acpi_object *)buffer.pointer;
1453         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1454                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1455                 status = -EFAULT;
1456                 goto out;
1457         }
1458
1459         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1460                           dod->package.count));
1461
1462         active_device_list = kmalloc((1 +
1463                                       dod->package.count) *
1464                                      sizeof(struct
1465                                             acpi_video_enumerated_device),
1466                                      GFP_KERNEL);
1467
1468         if (!active_device_list) {
1469                 status = -ENOMEM;
1470                 goto out;
1471         }
1472
1473         count = 0;
1474         for (i = 0; i < dod->package.count; i++) {
1475                 obj = (union acpi_object *)&dod->package.elements[i];
1476
1477                 if (obj->type != ACPI_TYPE_INTEGER) {
1478                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1479                                           "Invalid _DOD data\n"));
1480                         active_device_list[i].value.int_val =
1481                             ACPI_VIDEO_HEAD_INVALID;
1482                 }
1483                 active_device_list[i].value.int_val = obj->integer.value;
1484                 active_device_list[i].bind_info = NULL;
1485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1486                                   (int)obj->integer.value));
1487                 count++;
1488         }
1489         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1490
1491         if (video->attached_array)
1492                 kfree(video->attached_array);
1493
1494         video->attached_array = active_device_list;
1495         video->attached_count = count;
1496       out:
1497         acpi_os_free(buffer.pointer);
1498         return_VALUE(status);
1499 }
1500
1501 /*
1502  *  Arg:
1503  *      video   : video bus device 
1504  *      event   : Nontify Event
1505  *
1506  *  Return:
1507  *      < 0     : error
1508  *  
1509  *      1. Find out the current active output device.
1510  *      2. Identify the next output device to switch
1511  *      3. call _DSS to do actual switch.
1512  */
1513
1514 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1515 {
1516         struct list_head *node, *next;
1517         struct acpi_video_device *dev = NULL;
1518         struct acpi_video_device *dev_next = NULL;
1519         struct acpi_video_device *dev_prev = NULL;
1520         unsigned long state;
1521         int status = 0;
1522
1523         ACPI_FUNCTION_TRACE("acpi_video_switch_output");
1524
1525         list_for_each_safe(node, next, &video->video_device_list) {
1526                 dev = container_of(node, struct acpi_video_device, entry);
1527                 status = acpi_video_device_get_state(dev, &state);
1528                 if (state & 0x2) {
1529                         dev_next =
1530                             container_of(node->next, struct acpi_video_device,
1531                                          entry);
1532                         dev_prev =
1533                             container_of(node->prev, struct acpi_video_device,
1534                                          entry);
1535                         goto out;
1536                 }
1537         }
1538         dev_next = container_of(node->next, struct acpi_video_device, entry);
1539         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1540       out:
1541         switch (event) {
1542         case ACPI_VIDEO_NOTIFY_CYCLE:
1543         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1544                 acpi_video_device_set_state(dev, 0);
1545                 acpi_video_device_set_state(dev_next, 0x80000001);
1546                 break;
1547         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1548                 acpi_video_device_set_state(dev, 0);
1549                 acpi_video_device_set_state(dev_prev, 0x80000001);
1550         default:
1551                 break;
1552         }
1553
1554         return_VALUE(status);
1555 }
1556
1557 static int
1558 acpi_video_get_next_level(struct acpi_video_device *device,
1559                           u32 level_current, u32 event)
1560 {
1561         /*Fix me */
1562         return level_current;
1563 }
1564
1565 static void
1566 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1567 {
1568         unsigned long level_current, level_next;
1569         acpi_video_device_lcd_get_level_current(device, &level_current);
1570         level_next = acpi_video_get_next_level(device, level_current, event);
1571         acpi_video_device_lcd_set_level(device, level_next);
1572 }
1573
1574 static int
1575 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1576                            struct acpi_device *device)
1577 {
1578         int status = 0;
1579         struct list_head *node, *next;
1580
1581         ACPI_FUNCTION_TRACE("acpi_video_get_devices");
1582
1583         acpi_video_device_enumerate(video);
1584
1585         list_for_each_safe(node, next, &device->children) {
1586                 struct acpi_device *dev =
1587                     list_entry(node, struct acpi_device, node);
1588
1589                 if (!dev)
1590                         continue;
1591
1592                 status = acpi_video_bus_get_one_device(dev, video);
1593                 if (ACPI_FAILURE(status)) {
1594                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1595                                           "Cant attach device\n"));
1596                         continue;
1597                 }
1598
1599         }
1600         return_VALUE(status);
1601 }
1602
1603 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1604 {
1605         acpi_status status;
1606         struct acpi_video_bus *video;
1607
1608         ACPI_FUNCTION_TRACE("acpi_video_bus_put_one_device");
1609
1610         if (!device || !device->video)
1611                 return_VALUE(-ENOENT);
1612
1613         video = device->video;
1614
1615         down(&video->sem);
1616         list_del(&device->entry);
1617         up(&video->sem);
1618         acpi_video_device_remove_fs(device->dev);
1619
1620         status = acpi_remove_notify_handler(device->handle,
1621                                             ACPI_DEVICE_NOTIFY,
1622                                             acpi_video_device_notify);
1623         if (ACPI_FAILURE(status))
1624                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1625                                   "Error removing notify handler\n"));
1626
1627         return_VALUE(0);
1628 }
1629
1630 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1631 {
1632         int status;
1633         struct list_head *node, *next;
1634
1635         ACPI_FUNCTION_TRACE("acpi_video_bus_put_devices");
1636
1637         list_for_each_safe(node, next, &video->video_device_list) {
1638                 struct acpi_video_device *data =
1639                     list_entry(node, struct acpi_video_device, entry);
1640                 if (!data)
1641                         continue;
1642
1643                 status = acpi_video_bus_put_one_device(data);
1644                 if (ACPI_FAILURE(status))
1645                         printk(KERN_WARNING PREFIX
1646                                "hhuuhhuu bug in acpi video driver.\n");
1647
1648                 if (data->brightness)
1649                         kfree(data->brightness);
1650
1651                 kfree(data);
1652         }
1653
1654         return_VALUE(0);
1655 }
1656
1657 /* acpi_video interface */
1658
1659 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1660 {
1661         return acpi_video_bus_DOS(video, 1, 0);
1662 }
1663
1664 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1665 {
1666         return acpi_video_bus_DOS(video, 0, 1);
1667 }
1668
1669 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1670 {
1671         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1672         struct acpi_device *device = NULL;
1673
1674         ACPI_FUNCTION_TRACE("acpi_video_bus_notify");
1675         printk("video bus notify\n");
1676
1677         if (!video)
1678                 return_VOID;
1679
1680         if (acpi_bus_get_device(handle, &device))
1681                 return_VOID;
1682
1683         switch (event) {
1684         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1685                                          * most likely via hotkey. */
1686                 acpi_bus_generate_event(device, event, 0);
1687                 break;
1688
1689         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1690                                          * connector. */
1691                 acpi_video_device_enumerate(video);
1692                 acpi_video_device_rebind(video);
1693                 acpi_video_switch_output(video, event);
1694                 acpi_bus_generate_event(device, event, 0);
1695                 break;
1696
1697         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1698         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1699         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1700                 acpi_video_switch_output(video, event);
1701                 acpi_bus_generate_event(device, event, 0);
1702                 break;
1703
1704         default:
1705                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1706                                   "Unsupported event [0x%x]\n", event));
1707                 break;
1708         }
1709
1710         return_VOID;
1711 }
1712
1713 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1714 {
1715         struct acpi_video_device *video_device =
1716             (struct acpi_video_device *)data;
1717         struct acpi_device *device = NULL;
1718
1719         ACPI_FUNCTION_TRACE("acpi_video_device_notify");
1720
1721         printk("video device notify\n");
1722         if (!video_device)
1723                 return_VOID;
1724
1725         if (acpi_bus_get_device(handle, &device))
1726                 return_VOID;
1727
1728         switch (event) {
1729         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1730         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1731                 acpi_bus_generate_event(device, event, 0);
1732                 break;
1733         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1734         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1735         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1736         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1737         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1738                 acpi_video_switch_brightness(video_device, event);
1739                 acpi_bus_generate_event(device, event, 0);
1740                 break;
1741         default:
1742                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1743                                   "Unsupported event [0x%x]\n", event));
1744                 break;
1745         }
1746         return_VOID;
1747 }
1748
1749 static int acpi_video_bus_add(struct acpi_device *device)
1750 {
1751         int result = 0;
1752         acpi_status status = 0;
1753         struct acpi_video_bus *video = NULL;
1754
1755         ACPI_FUNCTION_TRACE("acpi_video_bus_add");
1756
1757         if (!device)
1758                 return_VALUE(-EINVAL);
1759
1760         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1761         if (!video)
1762                 return_VALUE(-ENOMEM);
1763         memset(video, 0, sizeof(struct acpi_video_bus));
1764
1765         video->handle = device->handle;
1766         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1767         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1768         acpi_driver_data(device) = video;
1769
1770         acpi_video_bus_find_cap(video);
1771         result = acpi_video_bus_check(video);
1772         if (result)
1773                 goto end;
1774
1775         result = acpi_video_bus_add_fs(device);
1776         if (result)
1777                 goto end;
1778
1779         init_MUTEX(&video->sem);
1780         INIT_LIST_HEAD(&video->video_device_list);
1781
1782         acpi_video_bus_get_devices(video, device);
1783         acpi_video_bus_start_devices(video);
1784
1785         status = acpi_install_notify_handler(video->handle,
1786                                              ACPI_DEVICE_NOTIFY,
1787                                              acpi_video_bus_notify, video);
1788         if (ACPI_FAILURE(status)) {
1789                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1790                                   "Error installing notify handler\n"));
1791                 result = -ENODEV;
1792                 goto end;
1793         }
1794
1795         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1796                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1797                video->flags.multihead ? "yes" : "no",
1798                video->flags.rom ? "yes" : "no",
1799                video->flags.post ? "yes" : "no");
1800
1801       end:
1802         if (result) {
1803                 acpi_video_bus_remove_fs(device);
1804                 kfree(video);
1805         }
1806
1807         return_VALUE(result);
1808 }
1809
1810 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1811 {
1812         acpi_status status = 0;
1813         struct acpi_video_bus *video = NULL;
1814
1815         ACPI_FUNCTION_TRACE("acpi_video_bus_remove");
1816
1817         if (!device || !acpi_driver_data(device))
1818                 return_VALUE(-EINVAL);
1819
1820         video = (struct acpi_video_bus *)acpi_driver_data(device);
1821
1822         acpi_video_bus_stop_devices(video);
1823
1824         status = acpi_remove_notify_handler(video->handle,
1825                                             ACPI_DEVICE_NOTIFY,
1826                                             acpi_video_bus_notify);
1827         if (ACPI_FAILURE(status))
1828                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1829                                   "Error removing notify handler\n"));
1830
1831         acpi_video_bus_put_devices(video);
1832         acpi_video_bus_remove_fs(device);
1833
1834         if (video->attached_array)
1835                 kfree(video->attached_array);
1836         kfree(video);
1837
1838         return_VALUE(0);
1839 }
1840
1841 static int
1842 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1843 {
1844         acpi_handle h_dummy1;
1845         acpi_handle h_dummy2;
1846         acpi_handle h_dummy3;
1847
1848         ACPI_FUNCTION_TRACE("acpi_video_bus_match");
1849
1850         if (!device || !driver)
1851                 return_VALUE(-EINVAL);
1852
1853         /* Since there is no HID, CID for ACPI Video drivers, we have
1854          * to check well known required nodes for each feature we support.
1855          */
1856
1857         /* Does this device able to support video switching ? */
1858         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1859             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1860                 return_VALUE(0);
1861
1862         /* Does this device able to retrieve a video ROM ? */
1863         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1864                 return_VALUE(0);
1865
1866         /* Does this device able to configure which video head to be POSTed ? */
1867         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1868             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1869             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1870                 return_VALUE(0);
1871
1872         return_VALUE(-ENODEV);
1873 }
1874
1875 static int __init acpi_video_init(void)
1876 {
1877         int result = 0;
1878
1879         ACPI_FUNCTION_TRACE("acpi_video_init");
1880
1881         /*
1882            acpi_dbg_level = 0xFFFFFFFF;
1883            acpi_dbg_layer = 0x08000000;
1884          */
1885
1886         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1887         if (!acpi_video_dir)
1888                 return_VALUE(-ENODEV);
1889         acpi_video_dir->owner = THIS_MODULE;
1890
1891         result = acpi_bus_register_driver(&acpi_video_bus);
1892         if (result < 0) {
1893                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1894                 return_VALUE(-ENODEV);
1895         }
1896
1897         return_VALUE(0);
1898 }
1899
1900 static void __exit acpi_video_exit(void)
1901 {
1902         ACPI_FUNCTION_TRACE("acpi_video_exit");
1903
1904         acpi_bus_unregister_driver(&acpi_video_bus);
1905
1906         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1907
1908         return_VOID;
1909 }
1910
1911 module_init(acpi_video_init);
1912 module_exit(acpi_video_exit);