ACPI video: make procfs I/F depend on CONFIG_ACPI_PROCFS
[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/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <linux/slab.h>
43 #include <asm/uaccess.h>
44 #include <linux/dmi.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47 #include <linux/suspend.h>
48 #include <acpi/video.h>
49
50 #define PREFIX "ACPI: "
51
52 #define ACPI_VIDEO_CLASS                "video"
53 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
54 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
55 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
56 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
57 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
58 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
59 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
60
61 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
62 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
63 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
64 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
65 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
66
67 #define MAX_NAME_LEN    20
68
69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
71
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
75
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
78
79 /*
80  * By default, we don't allow duplicate ACPI video bus devices
81  * under the same VGA controller
82  */
83 static int allow_duplicates;
84 module_param(allow_duplicates, bool, 0644);
85
86 static int register_count = 0;
87 static int acpi_video_bus_add(struct acpi_device *device);
88 static int acpi_video_bus_remove(struct acpi_device *device, int type);
89 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
90
91 static const struct acpi_device_id video_device_ids[] = {
92         {ACPI_VIDEO_HID, 0},
93         {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, video_device_ids);
96
97 static struct acpi_driver acpi_video_bus = {
98         .name = "video",
99         .class = ACPI_VIDEO_CLASS,
100         .ids = video_device_ids,
101         .ops = {
102                 .add = acpi_video_bus_add,
103                 .remove = acpi_video_bus_remove,
104                 .notify = acpi_video_bus_notify,
105                 },
106 };
107
108 struct acpi_video_bus_flags {
109         u8 multihead:1;         /* can switch video heads */
110         u8 rom:1;               /* can retrieve a video rom */
111         u8 post:1;              /* can configure the head to */
112         u8 reserved:5;
113 };
114
115 struct acpi_video_bus_cap {
116         u8 _DOS:1;              /*Enable/Disable output switching */
117         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
118         u8 _ROM:1;              /*Get ROM Data */
119         u8 _GPD:1;              /*Get POST Device */
120         u8 _SPD:1;              /*Set POST Device */
121         u8 _VPO:1;              /*Video POST Options */
122         u8 reserved:2;
123 };
124
125 struct acpi_video_device_attrib {
126         u32 display_index:4;    /* A zero-based instance of the Display */
127         u32 display_port_attachment:4;  /*This field differentiates the display type */
128         u32 display_type:4;     /*Describe the specific type in use */
129         u32 vendor_specific:4;  /*Chipset Vendor Specific */
130         u32 bios_can_detect:1;  /*BIOS can detect the device */
131         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to 
132                                    the VGA device. */
133         u32 pipe_id:3;          /*For VGA multiple-head devices. */
134         u32 reserved:10;        /*Must be 0 */
135         u32 device_id_scheme:1; /*Device ID Scheme */
136 };
137
138 struct acpi_video_enumerated_device {
139         union {
140                 u32 int_val;
141                 struct acpi_video_device_attrib attrib;
142         } value;
143         struct acpi_video_device *bind_info;
144 };
145
146 struct acpi_video_bus {
147         struct acpi_device *device;
148         u8 dos_setting;
149         struct acpi_video_enumerated_device *attached_array;
150         u8 attached_count;
151         struct acpi_video_bus_cap cap;
152         struct acpi_video_bus_flags flags;
153         struct list_head video_device_list;
154         struct mutex device_list_lock;  /* protects video_device_list */
155 #ifdef CONFIG_ACPI_PROCFS
156         struct proc_dir_entry *dir;
157 #endif
158         struct input_dev *input;
159         char phys[32];  /* for input device */
160         struct notifier_block pm_nb;
161 };
162
163 struct acpi_video_device_flags {
164         u8 crt:1;
165         u8 lcd:1;
166         u8 tvout:1;
167         u8 dvi:1;
168         u8 bios:1;
169         u8 unknown:1;
170         u8 reserved:2;
171 };
172
173 struct acpi_video_device_cap {
174         u8 _ADR:1;              /*Return the unique ID */
175         u8 _BCL:1;              /*Query list of brightness control levels supported */
176         u8 _BCM:1;              /*Set the brightness level */
177         u8 _BQC:1;              /* Get current brightness level */
178         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
179         u8 _DDC:1;              /*Return the EDID for this device */
180         u8 _DCS:1;              /*Return status of output device */
181         u8 _DGS:1;              /*Query graphics state */
182         u8 _DSS:1;              /*Device state set */
183 };
184
185 struct acpi_video_brightness_flags {
186         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
187         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
188         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
189         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
190         u8 _BQC_use_index:1;            /* _BQC returns an index value */
191 };
192
193 struct acpi_video_device_brightness {
194         int curr;
195         int count;
196         int *levels;
197         struct acpi_video_brightness_flags flags;
198 };
199
200 struct acpi_video_device {
201         unsigned long device_id;
202         struct acpi_video_device_flags flags;
203         struct acpi_video_device_cap cap;
204         struct list_head entry;
205         struct acpi_video_bus *video;
206         struct acpi_device *dev;
207         struct acpi_video_device_brightness *brightness;
208         struct backlight_device *backlight;
209         struct thermal_cooling_device *cooling_dev;
210         struct output_device *output_dev;
211 };
212
213 #ifdef CONFIG_ACPI_PROCFS
214 /* bus */
215 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
216 static const struct file_operations acpi_video_bus_info_fops = {
217         .owner = THIS_MODULE,
218         .open = acpi_video_bus_info_open_fs,
219         .read = seq_read,
220         .llseek = seq_lseek,
221         .release = single_release,
222 };
223
224 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
225 static const struct file_operations acpi_video_bus_ROM_fops = {
226         .owner = THIS_MODULE,
227         .open = acpi_video_bus_ROM_open_fs,
228         .read = seq_read,
229         .llseek = seq_lseek,
230         .release = single_release,
231 };
232
233 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
234                                             struct file *file);
235 static const struct file_operations acpi_video_bus_POST_info_fops = {
236         .owner = THIS_MODULE,
237         .open = acpi_video_bus_POST_info_open_fs,
238         .read = seq_read,
239         .llseek = seq_lseek,
240         .release = single_release,
241 };
242
243 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
244 static ssize_t acpi_video_bus_write_POST(struct file *file,
245         const char __user *buffer, size_t count, loff_t *data);
246 static const struct file_operations acpi_video_bus_POST_fops = {
247         .owner = THIS_MODULE,
248         .open = acpi_video_bus_POST_open_fs,
249         .read = seq_read,
250         .write = acpi_video_bus_write_POST,
251         .llseek = seq_lseek,
252         .release = single_release,
253 };
254
255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
256 static ssize_t acpi_video_bus_write_DOS(struct file *file,
257         const char __user *buffer, size_t count, loff_t *data);
258 static const struct file_operations acpi_video_bus_DOS_fops = {
259         .owner = THIS_MODULE,
260         .open = acpi_video_bus_DOS_open_fs,
261         .read = seq_read,
262         .write = acpi_video_bus_write_DOS,
263         .llseek = seq_lseek,
264         .release = single_release,
265 };
266
267 /* device */
268 static int acpi_video_device_info_open_fs(struct inode *inode,
269                                           struct file *file);
270 static const struct file_operations acpi_video_device_info_fops = {
271         .owner = THIS_MODULE,
272         .open = acpi_video_device_info_open_fs,
273         .read = seq_read,
274         .llseek = seq_lseek,
275         .release = single_release,
276 };
277
278 static int acpi_video_device_state_open_fs(struct inode *inode,
279                                            struct file *file);
280 static ssize_t acpi_video_device_write_state(struct file *file,
281         const char __user *buffer, size_t count, loff_t *data);
282 static const struct file_operations acpi_video_device_state_fops = {
283         .owner = THIS_MODULE,
284         .open = acpi_video_device_state_open_fs,
285         .read = seq_read,
286         .write = acpi_video_device_write_state,
287         .llseek = seq_lseek,
288         .release = single_release,
289 };
290
291 static int acpi_video_device_brightness_open_fs(struct inode *inode,
292                                                 struct file *file);
293 static ssize_t acpi_video_device_write_brightness(struct file *file,
294         const char __user *buffer, size_t count, loff_t *data);
295 static const struct file_operations acpi_video_device_brightness_fops = {
296         .owner = THIS_MODULE,
297         .open = acpi_video_device_brightness_open_fs,
298         .read = seq_read,
299         .write = acpi_video_device_write_brightness,
300         .llseek = seq_lseek,
301         .release = single_release,
302 };
303
304 static int acpi_video_device_EDID_open_fs(struct inode *inode,
305                                           struct file *file);
306 static const struct file_operations acpi_video_device_EDID_fops = {
307         .owner = THIS_MODULE,
308         .open = acpi_video_device_EDID_open_fs,
309         .read = seq_read,
310         .llseek = seq_lseek,
311         .release = single_release,
312 };
313 #endif /* CONFIG_ACPI_PROCFS */
314
315 static const char device_decode[][30] = {
316         "motherboard VGA device",
317         "PCI VGA device",
318         "AGP VGA device",
319         "UNKNOWN",
320 };
321
322 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
323 static void acpi_video_device_rebind(struct acpi_video_bus *video);
324 static void acpi_video_device_bind(struct acpi_video_bus *video,
325                                    struct acpi_video_device *device);
326 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
327 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
328                         int level);
329 static int acpi_video_device_lcd_get_level_current(
330                         struct acpi_video_device *device,
331                         unsigned long long *level, int init);
332 static int acpi_video_get_next_level(struct acpi_video_device *device,
333                                      u32 level_current, u32 event);
334 static int acpi_video_switch_brightness(struct acpi_video_device *device,
335                                          int event);
336 static int acpi_video_device_get_state(struct acpi_video_device *device,
337                             unsigned long long *state);
338 static int acpi_video_output_get(struct output_device *od);
339 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
340
341 /*backlight device sysfs support*/
342 static int acpi_video_get_brightness(struct backlight_device *bd)
343 {
344         unsigned long long cur_level;
345         int i;
346         struct acpi_video_device *vd =
347                 (struct acpi_video_device *)bl_get_data(bd);
348
349         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
350                 return -EINVAL;
351         for (i = 2; i < vd->brightness->count; i++) {
352                 if (vd->brightness->levels[i] == cur_level)
353                         /* The first two entries are special - see page 575
354                            of the ACPI spec 3.0 */
355                         return i-2;
356         }
357         return 0;
358 }
359
360 static int acpi_video_set_brightness(struct backlight_device *bd)
361 {
362         int request_level = bd->props.brightness + 2;
363         struct acpi_video_device *vd =
364                 (struct acpi_video_device *)bl_get_data(bd);
365
366         return acpi_video_device_lcd_set_level(vd,
367                                 vd->brightness->levels[request_level]);
368 }
369
370 static struct backlight_ops acpi_backlight_ops = {
371         .get_brightness = acpi_video_get_brightness,
372         .update_status  = acpi_video_set_brightness,
373 };
374
375 /*video output device sysfs support*/
376 static int acpi_video_output_get(struct output_device *od)
377 {
378         unsigned long long state;
379         struct acpi_video_device *vd =
380                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
381         acpi_video_device_get_state(vd, &state);
382         return (int)state;
383 }
384
385 static int acpi_video_output_set(struct output_device *od)
386 {
387         unsigned long state = od->request_state;
388         struct acpi_video_device *vd=
389                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
390         return acpi_video_device_set_state(vd, state);
391 }
392
393 static struct output_properties acpi_output_properties = {
394         .set_state = acpi_video_output_set,
395         .get_status = acpi_video_output_get,
396 };
397
398
399 /* thermal cooling device callbacks */
400 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
401                                long *state)
402 {
403         struct acpi_device *device = cooling_dev->devdata;
404         struct acpi_video_device *video = acpi_driver_data(device);
405
406         *state = video->brightness->count - 3;
407         return 0;
408 }
409
410 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
411                                long *state)
412 {
413         struct acpi_device *device = cooling_dev->devdata;
414         struct acpi_video_device *video = acpi_driver_data(device);
415         unsigned long long level;
416         int offset;
417
418         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
419                 return -EINVAL;
420         for (offset = 2; offset < video->brightness->count; offset++)
421                 if (level == video->brightness->levels[offset]) {
422                         *state = video->brightness->count - offset - 1;
423                         return 0;
424                 }
425
426         return -EINVAL;
427 }
428
429 static int
430 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
431 {
432         struct acpi_device *device = cooling_dev->devdata;
433         struct acpi_video_device *video = acpi_driver_data(device);
434         int level;
435
436         if ( state >= video->brightness->count - 2)
437                 return -EINVAL;
438
439         state = video->brightness->count - state;
440         level = video->brightness->levels[state -1];
441         return acpi_video_device_lcd_set_level(video, level);
442 }
443
444 static struct thermal_cooling_device_ops video_cooling_ops = {
445         .get_max_state = video_get_max_state,
446         .get_cur_state = video_get_cur_state,
447         .set_cur_state = video_set_cur_state,
448 };
449
450 /* --------------------------------------------------------------------------
451                                Video Management
452    -------------------------------------------------------------------------- */
453
454 /* device */
455
456 static int
457 acpi_video_device_get_state(struct acpi_video_device *device,
458                             unsigned long long *state)
459 {
460         int status;
461
462         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
463
464         return status;
465 }
466
467 static int
468 acpi_video_device_set_state(struct acpi_video_device *device, int state)
469 {
470         int status;
471         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
472         struct acpi_object_list args = { 1, &arg0 };
473         unsigned long long ret;
474
475
476         arg0.integer.value = state;
477         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
478
479         return status;
480 }
481
482 static int
483 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
484                                    union acpi_object **levels)
485 {
486         int status;
487         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
488         union acpi_object *obj;
489
490
491         *levels = NULL;
492
493         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
494         if (!ACPI_SUCCESS(status))
495                 return status;
496         obj = (union acpi_object *)buffer.pointer;
497         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
498                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
499                 status = -EFAULT;
500                 goto err;
501         }
502
503         *levels = obj;
504
505         return 0;
506
507       err:
508         kfree(buffer.pointer);
509
510         return status;
511 }
512
513 static int
514 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
515 {
516         int status;
517         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
518         struct acpi_object_list args = { 1, &arg0 };
519         int state;
520
521         arg0.integer.value = level;
522
523         status = acpi_evaluate_object(device->dev->handle, "_BCM",
524                                       &args, NULL);
525         if (ACPI_FAILURE(status)) {
526                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
527                 return -EIO;
528         }
529
530         device->brightness->curr = level;
531         for (state = 2; state < device->brightness->count; state++)
532                 if (level == device->brightness->levels[state]) {
533                         if (device->backlight)
534                                 device->backlight->props.brightness = state - 2;
535                         return 0;
536                 }
537
538         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
539         return -EINVAL;
540 }
541
542 /*
543  * For some buggy _BQC methods, we need to add a constant value to
544  * the _BQC return value to get the actual current brightness level
545  */
546
547 static int bqc_offset_aml_bug_workaround;
548 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
549 {
550         bqc_offset_aml_bug_workaround = 9;
551         return 0;
552 }
553
554 static struct dmi_system_id video_dmi_table[] __initdata = {
555         /*
556          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
557          */
558         {
559          .callback = video_set_bqc_offset,
560          .ident = "Acer Aspire 5720",
561          .matches = {
562                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
564                 },
565         },
566         {
567          .callback = video_set_bqc_offset,
568          .ident = "Acer Aspire 5710Z",
569          .matches = {
570                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
571                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
572                 },
573         },
574         {
575          .callback = video_set_bqc_offset,
576          .ident = "eMachines E510",
577          .matches = {
578                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
579                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
580                 },
581         },
582         {
583          .callback = video_set_bqc_offset,
584          .ident = "Acer Aspire 5315",
585          .matches = {
586                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
587                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
588                 },
589         },
590         {
591          .callback = video_set_bqc_offset,
592          .ident = "Acer Aspire 7720",
593          .matches = {
594                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
595                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
596                 },
597         },
598         {}
599 };
600
601 static int
602 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
603                                         unsigned long long *level, int init)
604 {
605         acpi_status status = AE_OK;
606         int i;
607
608         if (device->cap._BQC || device->cap._BCQ) {
609                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
610
611                 status = acpi_evaluate_integer(device->dev->handle, buf,
612                                                 NULL, level);
613                 if (ACPI_SUCCESS(status)) {
614                         if (device->brightness->flags._BQC_use_index) {
615                                 if (device->brightness->flags._BCL_reversed)
616                                         *level = device->brightness->count
617                                                                  - 3 - (*level);
618                                 *level = device->brightness->levels[*level + 2];
619
620                         }
621                         *level += bqc_offset_aml_bug_workaround;
622                         for (i = 2; i < device->brightness->count; i++)
623                                 if (device->brightness->levels[i] == *level) {
624                                         device->brightness->curr = *level;
625                                         return 0;
626                         }
627                         if (!init) {
628                                 /*
629                                  * BQC returned an invalid level.
630                                  * Stop using it.
631                                  */
632                                 ACPI_WARNING((AE_INFO,
633                                               "%s returned an invalid level",
634                                               buf));
635                                 device->cap._BQC = device->cap._BCQ = 0;
636                         }
637                 } else {
638                         /* Fixme:
639                          * should we return an error or ignore this failure?
640                          * dev->brightness->curr is a cached value which stores
641                          * the correct current backlight level in most cases.
642                          * ACPI video backlight still works w/ buggy _BQC.
643                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
644                          */
645                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
646                         device->cap._BQC = device->cap._BCQ = 0;
647                 }
648         }
649
650         *level = device->brightness->curr;
651         return 0;
652 }
653
654 static int
655 acpi_video_device_EDID(struct acpi_video_device *device,
656                        union acpi_object **edid, ssize_t length)
657 {
658         int status;
659         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
660         union acpi_object *obj;
661         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
662         struct acpi_object_list args = { 1, &arg0 };
663
664
665         *edid = NULL;
666
667         if (!device)
668                 return -ENODEV;
669         if (length == 128)
670                 arg0.integer.value = 1;
671         else if (length == 256)
672                 arg0.integer.value = 2;
673         else
674                 return -EINVAL;
675
676         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
677         if (ACPI_FAILURE(status))
678                 return -ENODEV;
679
680         obj = buffer.pointer;
681
682         if (obj && obj->type == ACPI_TYPE_BUFFER)
683                 *edid = obj;
684         else {
685                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
686                 status = -EFAULT;
687                 kfree(obj);
688         }
689
690         return status;
691 }
692
693 /* bus */
694
695 /*
696  *  Arg:
697  *      video           : video bus device pointer
698  *      bios_flag       : 
699  *              0.      The system BIOS should NOT automatically switch(toggle)
700  *                      the active display output.
701  *              1.      The system BIOS should automatically switch (toggle) the
702  *                      active display output. No switch event.
703  *              2.      The _DGS value should be locked.
704  *              3.      The system BIOS should not automatically switch (toggle) the
705  *                      active display output, but instead generate the display switch
706  *                      event notify code.
707  *      lcd_flag        :
708  *              0.      The system BIOS should automatically control the brightness level
709  *                      of the LCD when the power changes from AC to DC
710  *              1.      The system BIOS should NOT automatically control the brightness 
711  *                      level of the LCD when the power changes from AC to DC.
712  * Return Value:
713  *              -1      wrong arg.
714  */
715
716 static int
717 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
718 {
719         u64 status = 0;
720         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
721         struct acpi_object_list args = { 1, &arg0 };
722
723
724         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
725                 status = -1;
726                 goto Failed;
727         }
728         arg0.integer.value = (lcd_flag << 2) | bios_flag;
729         video->dos_setting = arg0.integer.value;
730         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
731
732       Failed:
733         return status;
734 }
735
736 /*
737  * Simple comparison function used to sort backlight levels.
738  */
739
740 static int
741 acpi_video_cmp_level(const void *a, const void *b)
742 {
743         return *(int *)a - *(int *)b;
744 }
745
746 /*
747  *  Arg:        
748  *      device  : video output device (LCD, CRT, ..)
749  *
750  *  Return Value:
751  *      Maximum brightness level
752  *
753  *  Allocate and initialize device->brightness.
754  */
755
756 static int
757 acpi_video_init_brightness(struct acpi_video_device *device)
758 {
759         union acpi_object *obj = NULL;
760         int i, max_level = 0, count = 0, level_ac_battery = 0;
761         unsigned long long level, level_old;
762         union acpi_object *o;
763         struct acpi_video_device_brightness *br = NULL;
764         int result = -EINVAL;
765
766         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
767                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
768                                                 "LCD brightness level\n"));
769                 goto out;
770         }
771
772         if (obj->package.count < 2)
773                 goto out;
774
775         br = kzalloc(sizeof(*br), GFP_KERNEL);
776         if (!br) {
777                 printk(KERN_ERR "can't allocate memory\n");
778                 result = -ENOMEM;
779                 goto out;
780         }
781
782         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
783                                 GFP_KERNEL);
784         if (!br->levels) {
785                 result = -ENOMEM;
786                 goto out_free;
787         }
788
789         for (i = 0; i < obj->package.count; i++) {
790                 o = (union acpi_object *)&obj->package.elements[i];
791                 if (o->type != ACPI_TYPE_INTEGER) {
792                         printk(KERN_ERR PREFIX "Invalid data\n");
793                         continue;
794                 }
795                 br->levels[count] = (u32) o->integer.value;
796
797                 if (br->levels[count] > max_level)
798                         max_level = br->levels[count];
799                 count++;
800         }
801
802         /*
803          * some buggy BIOS don't export the levels
804          * when machine is on AC/Battery in _BCL package.
805          * In this case, the first two elements in _BCL packages
806          * are also supported brightness levels that OS should take care of.
807          */
808         for (i = 2; i < count; i++) {
809                 if (br->levels[i] == br->levels[0])
810                         level_ac_battery++;
811                 if (br->levels[i] == br->levels[1])
812                         level_ac_battery++;
813         }
814
815         if (level_ac_battery < 2) {
816                 level_ac_battery = 2 - level_ac_battery;
817                 br->flags._BCL_no_ac_battery_levels = 1;
818                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
819                         br->levels[i] = br->levels[i - level_ac_battery];
820                 count += level_ac_battery;
821         } else if (level_ac_battery > 2)
822                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
823
824         /* Check if the _BCL package is in a reversed order */
825         if (max_level == br->levels[2]) {
826                 br->flags._BCL_reversed = 1;
827                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
828                         acpi_video_cmp_level, NULL);
829         } else if (max_level != br->levels[count - 1])
830                 ACPI_ERROR((AE_INFO,
831                             "Found unordered _BCL package\n"));
832
833         br->count = count;
834         device->brightness = br;
835
836         /* Check the input/output of _BQC/_BCL/_BCM */
837         if ((max_level < 100) && (max_level <= (count - 2)))
838                 br->flags._BCL_use_index = 1;
839
840         /*
841          * _BCM is always consistent with _BCL,
842          * at least for all the laptops we have ever seen.
843          */
844         br->flags._BCM_use_index = br->flags._BCL_use_index;
845
846         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
847         br->curr = level = max_level;
848
849         if (!device->cap._BQC)
850                 goto set_level;
851
852         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
853         if (result)
854                 goto out_free_levels;
855
856         /*
857          * Set the level to maximum and check if _BQC uses indexed value
858          */
859         result = acpi_video_device_lcd_set_level(device, max_level);
860         if (result)
861                 goto out_free_levels;
862
863         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
864         if (result)
865                 goto out_free_levels;
866
867         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
868
869         if (!br->flags._BQC_use_index) {
870                 /*
871                  * Set the backlight to the initial state.
872                  * On some buggy laptops, _BQC returns an uninitialized value
873                  * when invoked for the first time, i.e. level_old is invalid.
874                  * set the backlight to max_level in this case
875                  */
876                 for (i = 2; i < br->count; i++)
877                         if (level_old == br->levels[i])
878                                 level = level_old;
879                 goto set_level;
880         }
881
882         if (br->flags._BCL_reversed)
883                 level_old = (br->count - 1) - level_old;
884         level = br->levels[level_old];
885
886 set_level:
887         result = acpi_video_device_lcd_set_level(device, level);
888         if (result)
889                 goto out_free_levels;
890
891         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
892                           "found %d brightness levels\n", count - 2));
893         kfree(obj);
894         return result;
895
896 out_free_levels:
897         kfree(br->levels);
898 out_free:
899         kfree(br);
900 out:
901         device->brightness = NULL;
902         kfree(obj);
903         return result;
904 }
905
906 /*
907  *  Arg:
908  *      device  : video output device (LCD, CRT, ..)
909  *
910  *  Return Value:
911  *      None
912  *
913  *  Find out all required AML methods defined under the output
914  *  device.
915  */
916
917 static void acpi_video_device_find_cap(struct acpi_video_device *device)
918 {
919         acpi_handle h_dummy1;
920
921         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
922                 device->cap._ADR = 1;
923         }
924         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
925                 device->cap._BCL = 1;
926         }
927         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
928                 device->cap._BCM = 1;
929         }
930         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
931                 device->cap._BQC = 1;
932         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
933                                 &h_dummy1))) {
934                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
935                 device->cap._BCQ = 1;
936         }
937
938         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
939                 device->cap._DDC = 1;
940         }
941         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
942                 device->cap._DCS = 1;
943         }
944         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
945                 device->cap._DGS = 1;
946         }
947         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
948                 device->cap._DSS = 1;
949         }
950
951         if (acpi_video_backlight_support()) {
952                 struct backlight_properties props;
953                 int result;
954                 static int count = 0;
955                 char *name;
956
957                 result = acpi_video_init_brightness(device);
958                 if (result)
959                         return;
960                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
961                 if (!name)
962                         return;
963                 count++;
964
965                 memset(&props, 0, sizeof(struct backlight_properties));
966                 props.max_brightness = device->brightness->count - 3;
967                 device->backlight = backlight_device_register(name, NULL, device,
968                                                               &acpi_backlight_ops,
969                                                               &props);
970                 kfree(name);
971                 if (IS_ERR(device->backlight))
972                         return;
973
974                 /*
975                  * Save current brightness level in case we have to restore it
976                  * before acpi_video_device_lcd_set_level() is called next time.
977                  */
978                 device->backlight->props.brightness =
979                                 acpi_video_get_brightness(device->backlight);
980
981                 result = sysfs_create_link(&device->backlight->dev.kobj,
982                                            &device->dev->dev.kobj, "device");
983                 if (result)
984                         printk(KERN_ERR PREFIX "Create sysfs link\n");
985
986                 device->cooling_dev = thermal_cooling_device_register("LCD",
987                                         device->dev, &video_cooling_ops);
988                 if (IS_ERR(device->cooling_dev)) {
989                         /*
990                          * Set cooling_dev to NULL so we don't crash trying to
991                          * free it.
992                          * Also, why the hell we are returning early and
993                          * not attempt to register video output if cooling
994                          * device registration failed?
995                          * -- dtor
996                          */
997                         device->cooling_dev = NULL;
998                         return;
999                 }
1000
1001                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1002                          device->cooling_dev->id);
1003                 result = sysfs_create_link(&device->dev->dev.kobj,
1004                                 &device->cooling_dev->device.kobj,
1005                                 "thermal_cooling");
1006                 if (result)
1007                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1008                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1009                                 &device->dev->dev.kobj, "device");
1010                 if (result)
1011                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1012
1013         }
1014
1015         if (acpi_video_display_switch_support()) {
1016
1017                 if (device->cap._DCS && device->cap._DSS) {
1018                         static int count;
1019                         char *name;
1020                         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1021                         if (!name)
1022                                 return;
1023                         count++;
1024                         device->output_dev = video_output_register(name,
1025                                         NULL, device, &acpi_output_properties);
1026                         kfree(name);
1027                 }
1028         }
1029 }
1030
1031 /*
1032  *  Arg:        
1033  *      device  : video output device (VGA)
1034  *
1035  *  Return Value:
1036  *      None
1037  *
1038  *  Find out all required AML methods defined under the video bus device.
1039  */
1040
1041 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1042 {
1043         acpi_handle h_dummy1;
1044
1045         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1046                 video->cap._DOS = 1;
1047         }
1048         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1049                 video->cap._DOD = 1;
1050         }
1051         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1052                 video->cap._ROM = 1;
1053         }
1054         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1055                 video->cap._GPD = 1;
1056         }
1057         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1058                 video->cap._SPD = 1;
1059         }
1060         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1061                 video->cap._VPO = 1;
1062         }
1063 }
1064
1065 /*
1066  * Check whether the video bus device has required AML method to
1067  * support the desired features
1068  */
1069
1070 static int acpi_video_bus_check(struct acpi_video_bus *video)
1071 {
1072         acpi_status status = -ENOENT;
1073         struct pci_dev *dev;
1074
1075         if (!video)
1076                 return -EINVAL;
1077
1078         dev = acpi_get_pci_dev(video->device->handle);
1079         if (!dev)
1080                 return -ENODEV;
1081         pci_dev_put(dev);
1082
1083         /* Since there is no HID, CID and so on for VGA driver, we have
1084          * to check well known required nodes.
1085          */
1086
1087         /* Does this device support video switching? */
1088         if (video->cap._DOS || video->cap._DOD) {
1089                 if (!video->cap._DOS) {
1090                         printk(KERN_WARNING FW_BUG
1091                                 "ACPI(%s) defines _DOD but not _DOS\n",
1092                                 acpi_device_bid(video->device));
1093                 }
1094                 video->flags.multihead = 1;
1095                 status = 0;
1096         }
1097
1098         /* Does this device support retrieving a video ROM? */
1099         if (video->cap._ROM) {
1100                 video->flags.rom = 1;
1101                 status = 0;
1102         }
1103
1104         /* Does this device support configuring which video device to POST? */
1105         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1106                 video->flags.post = 1;
1107                 status = 0;
1108         }
1109
1110         return status;
1111 }
1112
1113 /* --------------------------------------------------------------------------
1114                               FS Interface (/proc)
1115    -------------------------------------------------------------------------- */
1116 #ifdef CONFIG_ACPI_PROCFS
1117
1118 static struct proc_dir_entry *acpi_video_dir;
1119
1120 /* video devices */
1121
1122 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1123 {
1124         struct acpi_video_device *dev = seq->private;
1125
1126
1127         if (!dev)
1128                 goto end;
1129
1130         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1131         seq_printf(seq, "type:         ");
1132         if (dev->flags.crt)
1133                 seq_printf(seq, "CRT\n");
1134         else if (dev->flags.lcd)
1135                 seq_printf(seq, "LCD\n");
1136         else if (dev->flags.tvout)
1137                 seq_printf(seq, "TVOUT\n");
1138         else if (dev->flags.dvi)
1139                 seq_printf(seq, "DVI\n");
1140         else
1141                 seq_printf(seq, "UNKNOWN\n");
1142
1143         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1144
1145       end:
1146         return 0;
1147 }
1148
1149 static int
1150 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1151 {
1152         return single_open(file, acpi_video_device_info_seq_show,
1153                            PDE(inode)->data);
1154 }
1155
1156 static int
1157 acpi_video_device_query(struct acpi_video_device *device,
1158                         unsigned long long *state)
1159 {
1160         int status;
1161
1162         status = acpi_evaluate_integer(device->dev->handle, "_DGS",
1163                                        NULL, state);
1164
1165         return status;
1166 }
1167
1168 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1169 {
1170         int status;
1171         struct acpi_video_device *dev = seq->private;
1172         unsigned long long state;
1173
1174
1175         if (!dev)
1176                 goto end;
1177
1178         status = acpi_video_device_get_state(dev, &state);
1179         seq_printf(seq, "state:     ");
1180         if (ACPI_SUCCESS(status))
1181                 seq_printf(seq, "0x%02llx\n", state);
1182         else
1183                 seq_printf(seq, "<not supported>\n");
1184
1185         status = acpi_video_device_query(dev, &state);
1186         seq_printf(seq, "query:     ");
1187         if (ACPI_SUCCESS(status))
1188                 seq_printf(seq, "0x%02llx\n", state);
1189         else
1190                 seq_printf(seq, "<not supported>\n");
1191
1192       end:
1193         return 0;
1194 }
1195
1196 static int
1197 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1198 {
1199         return single_open(file, acpi_video_device_state_seq_show,
1200                            PDE(inode)->data);
1201 }
1202
1203 static ssize_t
1204 acpi_video_device_write_state(struct file *file,
1205                               const char __user * buffer,
1206                               size_t count, loff_t * data)
1207 {
1208         int status;
1209         struct seq_file *m = file->private_data;
1210         struct acpi_video_device *dev = m->private;
1211         char str[12] = { 0 };
1212         u32 state = 0;
1213
1214
1215         if (!dev || count >= sizeof(str))
1216                 return -EINVAL;
1217
1218         if (copy_from_user(str, buffer, count))
1219                 return -EFAULT;
1220
1221         str[count] = 0;
1222         state = simple_strtoul(str, NULL, 0);
1223         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1224
1225         status = acpi_video_device_set_state(dev, state);
1226
1227         if (status)
1228                 return -EFAULT;
1229
1230         return count;
1231 }
1232
1233 static int
1234 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1235 {
1236         struct acpi_video_device *dev = seq->private;
1237         int i;
1238
1239
1240         if (!dev || !dev->brightness) {
1241                 seq_printf(seq, "<not supported>\n");
1242                 return 0;
1243         }
1244
1245         seq_printf(seq, "levels: ");
1246         for (i = 2; i < dev->brightness->count; i++)
1247                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1248         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1249
1250         return 0;
1251 }
1252
1253 static int
1254 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1255 {
1256         return single_open(file, acpi_video_device_brightness_seq_show,
1257                            PDE(inode)->data);
1258 }
1259
1260 static ssize_t
1261 acpi_video_device_write_brightness(struct file *file,
1262                                    const char __user * buffer,
1263                                    size_t count, loff_t * data)
1264 {
1265         struct seq_file *m = file->private_data;
1266         struct acpi_video_device *dev = m->private;
1267         char str[5] = { 0 };
1268         unsigned int level = 0;
1269         int i;
1270
1271
1272         if (!dev || !dev->brightness || count >= sizeof(str))
1273                 return -EINVAL;
1274
1275         if (copy_from_user(str, buffer, count))
1276                 return -EFAULT;
1277
1278         str[count] = 0;
1279         level = simple_strtoul(str, NULL, 0);
1280
1281         if (level > 100)
1282                 return -EFAULT;
1283
1284         /* validate through the list of available levels */
1285         for (i = 2; i < dev->brightness->count; i++)
1286                 if (level == dev->brightness->levels[i]) {
1287                         if (!acpi_video_device_lcd_set_level(dev, level))
1288                                 return count;
1289                         break;
1290                 }
1291
1292         return -EINVAL;
1293 }
1294
1295 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1296 {
1297         struct acpi_video_device *dev = seq->private;
1298         int status;
1299         int i;
1300         union acpi_object *edid = NULL;
1301
1302
1303         if (!dev)
1304                 goto out;
1305
1306         status = acpi_video_device_EDID(dev, &edid, 128);
1307         if (ACPI_FAILURE(status)) {
1308                 status = acpi_video_device_EDID(dev, &edid, 256);
1309         }
1310
1311         if (ACPI_FAILURE(status)) {
1312                 goto out;
1313         }
1314
1315         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1316                 for (i = 0; i < edid->buffer.length; i++)
1317                         seq_putc(seq, edid->buffer.pointer[i]);
1318         }
1319
1320       out:
1321         if (!edid)
1322                 seq_printf(seq, "<not supported>\n");
1323         else
1324                 kfree(edid);
1325
1326         return 0;
1327 }
1328
1329 static int
1330 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1331 {
1332         return single_open(file, acpi_video_device_EDID_seq_show,
1333                            PDE(inode)->data);
1334 }
1335
1336 static int acpi_video_device_add_fs(struct acpi_device *device)
1337 {
1338         struct proc_dir_entry *entry, *device_dir;
1339         struct acpi_video_device *vid_dev;
1340
1341         vid_dev = acpi_driver_data(device);
1342         if (!vid_dev)
1343                 return -ENODEV;
1344
1345         device_dir = proc_mkdir(acpi_device_bid(device),
1346                                 vid_dev->video->dir);
1347         if (!device_dir)
1348                 return -ENOMEM;
1349
1350         /* 'info' [R] */
1351         entry = proc_create_data("info", S_IRUGO, device_dir,
1352                         &acpi_video_device_info_fops, acpi_driver_data(device));
1353         if (!entry)
1354                 goto err_remove_dir;
1355
1356         /* 'state' [R/W] */
1357         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1358                                  device_dir,
1359                                  &acpi_video_device_state_fops,
1360                                  acpi_driver_data(device));
1361         if (!entry)
1362                 goto err_remove_info;
1363
1364         /* 'brightness' [R/W] */
1365         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1366                                  device_dir,
1367                                  &acpi_video_device_brightness_fops,
1368                                  acpi_driver_data(device));
1369         if (!entry)
1370                 goto err_remove_state;
1371
1372         /* 'EDID' [R] */
1373         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1374                                  &acpi_video_device_EDID_fops,
1375                                  acpi_driver_data(device));
1376         if (!entry)
1377                 goto err_remove_brightness;
1378
1379         acpi_device_dir(device) = device_dir;
1380
1381         return 0;
1382
1383  err_remove_brightness:
1384         remove_proc_entry("brightness", device_dir);
1385  err_remove_state:
1386         remove_proc_entry("state", device_dir);
1387  err_remove_info:
1388         remove_proc_entry("info", device_dir);
1389  err_remove_dir:
1390         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1391         return -ENOMEM;
1392 }
1393
1394 static int acpi_video_device_remove_fs(struct acpi_device *device)
1395 {
1396         struct acpi_video_device *vid_dev;
1397         struct proc_dir_entry *device_dir;
1398
1399         vid_dev = acpi_driver_data(device);
1400         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1401                 return -ENODEV;
1402
1403         device_dir = acpi_device_dir(device);
1404         if (device_dir) {
1405                 remove_proc_entry("info", device_dir);
1406                 remove_proc_entry("state", device_dir);
1407                 remove_proc_entry("brightness", device_dir);
1408                 remove_proc_entry("EDID", device_dir);
1409                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1410                 acpi_device_dir(device) = NULL;
1411         }
1412
1413         return 0;
1414 }
1415
1416 /* video bus */
1417 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1418 {
1419         struct acpi_video_bus *video = seq->private;
1420
1421
1422         if (!video)
1423                 goto end;
1424
1425         seq_printf(seq, "Switching heads:              %s\n",
1426                    video->flags.multihead ? "yes" : "no");
1427         seq_printf(seq, "Video ROM:                    %s\n",
1428                    video->flags.rom ? "yes" : "no");
1429         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1430                    video->flags.post ? "yes" : "no");
1431
1432       end:
1433         return 0;
1434 }
1435
1436 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1437 {
1438         return single_open(file, acpi_video_bus_info_seq_show,
1439                            PDE(inode)->data);
1440 }
1441
1442 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1443 {
1444         struct acpi_video_bus *video = seq->private;
1445
1446
1447         if (!video)
1448                 goto end;
1449
1450         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1451         seq_printf(seq, "<TODO>\n");
1452
1453       end:
1454         return 0;
1455 }
1456
1457 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1458 {
1459         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1460 }
1461
1462 static int
1463 acpi_video_bus_POST_options(struct acpi_video_bus *video,
1464                             unsigned long long *options)
1465 {
1466         int status;
1467
1468         status = acpi_evaluate_integer(video->device->handle, "_VPO",
1469                                        NULL, options);
1470         *options &= 3;
1471
1472         return status;
1473 }
1474
1475 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1476 {
1477         struct acpi_video_bus *video = seq->private;
1478         unsigned long long options;
1479         int status;
1480
1481
1482         if (!video)
1483                 goto end;
1484
1485         status = acpi_video_bus_POST_options(video, &options);
1486         if (ACPI_SUCCESS(status)) {
1487                 if (!(options & 1)) {
1488                         printk(KERN_WARNING PREFIX
1489                                "The motherboard VGA device is not listed as a possible POST device.\n");
1490                         printk(KERN_WARNING PREFIX
1491                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1492                 }
1493                 printk(KERN_WARNING "%llx\n", options);
1494                 seq_printf(seq, "can POST: <integrated video>");
1495                 if (options & 2)
1496                         seq_printf(seq, " <PCI video>");
1497                 if (options & 4)
1498                         seq_printf(seq, " <AGP video>");
1499                 seq_putc(seq, '\n');
1500         } else
1501                 seq_printf(seq, "<not supported>\n");
1502       end:
1503         return 0;
1504 }
1505
1506 static int
1507 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1508 {
1509         return single_open(file, acpi_video_bus_POST_info_seq_show,
1510                            PDE(inode)->data);
1511 }
1512
1513 static int
1514 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
1515 {
1516         int status;
1517
1518         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
1519
1520         return status;
1521 }
1522
1523 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1524 {
1525         struct acpi_video_bus *video = seq->private;
1526         int status;
1527         unsigned long long id;
1528
1529
1530         if (!video)
1531                 goto end;
1532
1533         status = acpi_video_bus_get_POST(video, &id);
1534         if (!ACPI_SUCCESS(status)) {
1535                 seq_printf(seq, "<not supported>\n");
1536                 goto end;
1537         }
1538         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1539
1540       end:
1541         return 0;
1542 }
1543
1544 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1545 {
1546         struct acpi_video_bus *video = seq->private;
1547
1548
1549         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1550
1551         return 0;
1552 }
1553
1554 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1555 {
1556         return single_open(file, acpi_video_bus_POST_seq_show,
1557                            PDE(inode)->data);
1558 }
1559
1560 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1561 {
1562         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1563 }
1564
1565 static int
1566 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
1567 {
1568         int status;
1569         unsigned long long tmp;
1570         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
1571         struct acpi_object_list args = { 1, &arg0 };
1572
1573
1574         arg0.integer.value = option;
1575
1576         status = acpi_evaluate_integer(video->device->handle, "_SPD",
1577                                        &args, &tmp);
1578         if (ACPI_SUCCESS(status))
1579                 status = tmp ? (-EINVAL) : (AE_OK);
1580
1581         return status;
1582 }
1583
1584 static ssize_t
1585 acpi_video_bus_write_POST(struct file *file,
1586                           const char __user * buffer,
1587                           size_t count, loff_t * data)
1588 {
1589         int status;
1590         struct seq_file *m = file->private_data;
1591         struct acpi_video_bus *video = m->private;
1592         char str[12] = { 0 };
1593         unsigned long long opt, options;
1594
1595
1596         if (!video || count >= sizeof(str))
1597                 return -EINVAL;
1598
1599         status = acpi_video_bus_POST_options(video, &options);
1600         if (!ACPI_SUCCESS(status))
1601                 return -EINVAL;
1602
1603         if (copy_from_user(str, buffer, count))
1604                 return -EFAULT;
1605
1606         str[count] = 0;
1607         opt = strtoul(str, NULL, 0);
1608         if (opt > 3)
1609                 return -EFAULT;
1610
1611         /* just in case an OEM 'forgot' the motherboard... */
1612         options |= 1;
1613
1614         if (options & (1ul << opt)) {
1615                 status = acpi_video_bus_set_POST(video, opt);
1616                 if (!ACPI_SUCCESS(status))
1617                         return -EFAULT;
1618
1619         }
1620
1621         return count;
1622 }
1623
1624 static ssize_t
1625 acpi_video_bus_write_DOS(struct file *file,
1626                          const char __user * buffer,
1627                          size_t count, loff_t * data)
1628 {
1629         int status;
1630         struct seq_file *m = file->private_data;
1631         struct acpi_video_bus *video = m->private;
1632         char str[12] = { 0 };
1633         unsigned long opt;
1634
1635
1636         if (!video || count >= sizeof(str))
1637                 return -EINVAL;
1638
1639         if (copy_from_user(str, buffer, count))
1640                 return -EFAULT;
1641
1642         str[count] = 0;
1643         opt = strtoul(str, NULL, 0);
1644         if (opt > 7)
1645                 return -EFAULT;
1646
1647         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1648
1649         if (!ACPI_SUCCESS(status))
1650                 return -EFAULT;
1651
1652         return count;
1653 }
1654
1655 static int acpi_video_bus_add_fs(struct acpi_device *device)
1656 {
1657         struct acpi_video_bus *video = acpi_driver_data(device);
1658         struct proc_dir_entry *device_dir;
1659         struct proc_dir_entry *entry;
1660
1661         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1662         if (!device_dir)
1663                 return -ENOMEM;
1664
1665         /* 'info' [R] */
1666         entry = proc_create_data("info", S_IRUGO, device_dir,
1667                                  &acpi_video_bus_info_fops,
1668                                  acpi_driver_data(device));
1669         if (!entry)
1670                 goto err_remove_dir;
1671
1672         /* 'ROM' [R] */
1673         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1674                                  &acpi_video_bus_ROM_fops,
1675                                  acpi_driver_data(device));
1676         if (!entry)
1677                 goto err_remove_info;
1678
1679         /* 'POST_info' [R] */
1680         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1681                                  &acpi_video_bus_POST_info_fops,
1682                                  acpi_driver_data(device));
1683         if (!entry)
1684                 goto err_remove_rom;
1685
1686         /* 'POST' [R/W] */
1687         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1688                                  device_dir,
1689                                  &acpi_video_bus_POST_fops,
1690                                  acpi_driver_data(device));
1691         if (!entry)
1692                 goto err_remove_post_info;
1693
1694         /* 'DOS' [R/W] */
1695         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1696                                  device_dir,
1697                                  &acpi_video_bus_DOS_fops,
1698                                  acpi_driver_data(device));
1699         if (!entry)
1700                 goto err_remove_post;
1701
1702         video->dir = acpi_device_dir(device) = device_dir;
1703         return 0;
1704
1705  err_remove_post:
1706         remove_proc_entry("POST", device_dir);
1707  err_remove_post_info:
1708         remove_proc_entry("POST_info", device_dir);
1709  err_remove_rom:
1710         remove_proc_entry("ROM", device_dir);
1711  err_remove_info:
1712         remove_proc_entry("info", device_dir);
1713  err_remove_dir:
1714         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1715         return -ENOMEM;
1716 }
1717
1718 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1719 {
1720         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1721
1722         if (device_dir) {
1723                 remove_proc_entry("info", device_dir);
1724                 remove_proc_entry("ROM", device_dir);
1725                 remove_proc_entry("POST_info", device_dir);
1726                 remove_proc_entry("POST", device_dir);
1727                 remove_proc_entry("DOS", device_dir);
1728                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1729                 acpi_device_dir(device) = NULL;
1730         }
1731
1732         return 0;
1733 }
1734 #else
1735 static inline int acpi_video_device_add_fs(struct acpi_device *device)
1736 {
1737         return 0;
1738 }
1739 static inline int acpi_video_device_remove_fs(struct acpi_device *device)
1740 {
1741         return 0;
1742 }
1743 static inline int acpi_video_bus_add_fs(struct acpi_device *device)
1744 {
1745         return 0;
1746 }
1747 static inline int acpi_video_bus_remove_fs(struct acpi_device *device)
1748 {
1749         return 0;
1750 }
1751 #endif /* CONFIG_ACPI_PROCFS */
1752
1753 /* --------------------------------------------------------------------------
1754                                  Driver Interface
1755    -------------------------------------------------------------------------- */
1756
1757 /* device interface */
1758 static struct acpi_video_device_attrib*
1759 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1760 {
1761         struct acpi_video_enumerated_device *ids;
1762         int i;
1763
1764         for (i = 0; i < video->attached_count; i++) {
1765                 ids = &video->attached_array[i];
1766                 if ((ids->value.int_val & 0xffff) == device_id)
1767                         return &ids->value.attrib;
1768         }
1769
1770         return NULL;
1771 }
1772
1773 static int
1774 acpi_video_get_device_type(struct acpi_video_bus *video,
1775                            unsigned long device_id)
1776 {
1777         struct acpi_video_enumerated_device *ids;
1778         int i;
1779
1780         for (i = 0; i < video->attached_count; i++) {
1781                 ids = &video->attached_array[i];
1782                 if ((ids->value.int_val & 0xffff) == device_id)
1783                         return ids->value.int_val;
1784         }
1785
1786         return 0;
1787 }
1788
1789 static int
1790 acpi_video_bus_get_one_device(struct acpi_device *device,
1791                               struct acpi_video_bus *video)
1792 {
1793         unsigned long long device_id;
1794         int status, device_type;
1795         struct acpi_video_device *data;
1796         struct acpi_video_device_attrib* attribute;
1797
1798         if (!device || !video)
1799                 return -EINVAL;
1800
1801         status =
1802             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1803         if (ACPI_SUCCESS(status)) {
1804
1805                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1806                 if (!data)
1807                         return -ENOMEM;
1808
1809                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1810                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1811                 device->driver_data = data;
1812
1813                 data->device_id = device_id;
1814                 data->video = video;
1815                 data->dev = device;
1816
1817                 attribute = acpi_video_get_device_attr(video, device_id);
1818
1819                 if((attribute != NULL) && attribute->device_id_scheme) {
1820                         switch (attribute->display_type) {
1821                         case ACPI_VIDEO_DISPLAY_CRT:
1822                                 data->flags.crt = 1;
1823                                 break;
1824                         case ACPI_VIDEO_DISPLAY_TV:
1825                                 data->flags.tvout = 1;
1826                                 break;
1827                         case ACPI_VIDEO_DISPLAY_DVI:
1828                                 data->flags.dvi = 1;
1829                                 break;
1830                         case ACPI_VIDEO_DISPLAY_LCD:
1831                                 data->flags.lcd = 1;
1832                                 break;
1833                         default:
1834                                 data->flags.unknown = 1;
1835                                 break;
1836                         }
1837                         if(attribute->bios_can_detect)
1838                                 data->flags.bios = 1;
1839                 } else {
1840                         /* Check for legacy IDs */
1841                         device_type = acpi_video_get_device_type(video,
1842                                                                  device_id);
1843                         /* Ignore bits 16 and 18-20 */
1844                         switch (device_type & 0xffe2ffff) {
1845                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1846                                 data->flags.crt = 1;
1847                                 break;
1848                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1849                                 data->flags.lcd = 1;
1850                                 break;
1851                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1852                                 data->flags.tvout = 1;
1853                                 break;
1854                         default:
1855                                 data->flags.unknown = 1;
1856                         }
1857                 }
1858
1859                 acpi_video_device_bind(video, data);
1860                 acpi_video_device_find_cap(data);
1861
1862                 status = acpi_install_notify_handler(device->handle,
1863                                                      ACPI_DEVICE_NOTIFY,
1864                                                      acpi_video_device_notify,
1865                                                      data);
1866                 if (ACPI_FAILURE(status)) {
1867                         printk(KERN_ERR PREFIX
1868                                           "Error installing notify handler\n");
1869                         if(data->brightness)
1870                                 kfree(data->brightness->levels);
1871                         kfree(data->brightness);
1872                         kfree(data);
1873                         return -ENODEV;
1874                 }
1875
1876                 mutex_lock(&video->device_list_lock);
1877                 list_add_tail(&data->entry, &video->video_device_list);
1878                 mutex_unlock(&video->device_list_lock);
1879
1880                 acpi_video_device_add_fs(device);
1881
1882                 return 0;
1883         }
1884
1885         return -ENOENT;
1886 }
1887
1888 /*
1889  *  Arg:
1890  *      video   : video bus device 
1891  *
1892  *  Return:
1893  *      none
1894  *  
1895  *  Enumerate the video device list of the video bus, 
1896  *  bind the ids with the corresponding video devices
1897  *  under the video bus.
1898  */
1899
1900 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1901 {
1902         struct acpi_video_device *dev;
1903
1904         mutex_lock(&video->device_list_lock);
1905
1906         list_for_each_entry(dev, &video->video_device_list, entry)
1907                 acpi_video_device_bind(video, dev);
1908
1909         mutex_unlock(&video->device_list_lock);
1910 }
1911
1912 /*
1913  *  Arg:
1914  *      video   : video bus device 
1915  *      device  : video output device under the video 
1916  *              bus
1917  *
1918  *  Return:
1919  *      none
1920  *  
1921  *  Bind the ids with the corresponding video devices
1922  *  under the video bus.
1923  */
1924
1925 static void
1926 acpi_video_device_bind(struct acpi_video_bus *video,
1927                        struct acpi_video_device *device)
1928 {
1929         struct acpi_video_enumerated_device *ids;
1930         int i;
1931
1932         for (i = 0; i < video->attached_count; i++) {
1933                 ids = &video->attached_array[i];
1934                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1935                         ids->bind_info = device;
1936                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1937                 }
1938         }
1939 }
1940
1941 /*
1942  *  Arg:
1943  *      video   : video bus device 
1944  *
1945  *  Return:
1946  *      < 0     : error
1947  *  
1948  *  Call _DOD to enumerate all devices attached to display adapter
1949  *
1950  */
1951
1952 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1953 {
1954         int status;
1955         int count;
1956         int i;
1957         struct acpi_video_enumerated_device *active_list;
1958         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1959         union acpi_object *dod = NULL;
1960         union acpi_object *obj;
1961
1962         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1963         if (!ACPI_SUCCESS(status)) {
1964                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1965                 return status;
1966         }
1967
1968         dod = buffer.pointer;
1969         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1970                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1971                 status = -EFAULT;
1972                 goto out;
1973         }
1974
1975         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1976                           dod->package.count));
1977
1978         active_list = kcalloc(1 + dod->package.count,
1979                               sizeof(struct acpi_video_enumerated_device),
1980                               GFP_KERNEL);
1981         if (!active_list) {
1982                 status = -ENOMEM;
1983                 goto out;
1984         }
1985
1986         count = 0;
1987         for (i = 0; i < dod->package.count; i++) {
1988                 obj = &dod->package.elements[i];
1989
1990                 if (obj->type != ACPI_TYPE_INTEGER) {
1991                         printk(KERN_ERR PREFIX
1992                                 "Invalid _DOD data in element %d\n", i);
1993                         continue;
1994                 }
1995
1996                 active_list[count].value.int_val = obj->integer.value;
1997                 active_list[count].bind_info = NULL;
1998                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1999                                   (int)obj->integer.value));
2000                 count++;
2001         }
2002
2003         kfree(video->attached_array);
2004
2005         video->attached_array = active_list;
2006         video->attached_count = count;
2007
2008  out:
2009         kfree(buffer.pointer);
2010         return status;
2011 }
2012
2013 static int
2014 acpi_video_get_next_level(struct acpi_video_device *device,
2015                           u32 level_current, u32 event)
2016 {
2017         int min, max, min_above, max_below, i, l, delta = 255;
2018         max = max_below = 0;
2019         min = min_above = 255;
2020         /* Find closest level to level_current */
2021         for (i = 2; i < device->brightness->count; i++) {
2022                 l = device->brightness->levels[i];
2023                 if (abs(l - level_current) < abs(delta)) {
2024                         delta = l - level_current;
2025                         if (!delta)
2026                                 break;
2027                 }
2028         }
2029         /* Ajust level_current to closest available level */
2030         level_current += delta;
2031         for (i = 2; i < device->brightness->count; i++) {
2032                 l = device->brightness->levels[i];
2033                 if (l < min)
2034                         min = l;
2035                 if (l > max)
2036                         max = l;
2037                 if (l < min_above && l > level_current)
2038                         min_above = l;
2039                 if (l > max_below && l < level_current)
2040                         max_below = l;
2041         }
2042
2043         switch (event) {
2044         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
2045                 return (level_current < max) ? min_above : min;
2046         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
2047                 return (level_current < max) ? min_above : max;
2048         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
2049                 return (level_current > min) ? max_below : min;
2050         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
2051         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
2052                 return 0;
2053         default:
2054                 return level_current;
2055         }
2056 }
2057
2058 static int
2059 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2060 {
2061         unsigned long long level_current, level_next;
2062         int result = -EINVAL;
2063
2064         /* no warning message if acpi_backlight=vendor is used */
2065         if (!acpi_video_backlight_support())
2066                 return 0;
2067
2068         if (!device->brightness)
2069                 goto out;
2070
2071         result = acpi_video_device_lcd_get_level_current(device,
2072                                                          &level_current, 0);
2073         if (result)
2074                 goto out;
2075
2076         level_next = acpi_video_get_next_level(device, level_current, event);
2077
2078         result = acpi_video_device_lcd_set_level(device, level_next);
2079
2080         if (!result)
2081                 backlight_force_update(device->backlight,
2082                                        BACKLIGHT_UPDATE_HOTKEY);
2083
2084 out:
2085         if (result)
2086                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2087
2088         return result;
2089 }
2090
2091 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
2092                         void **edid)
2093 {
2094         struct acpi_video_bus *video;
2095         struct acpi_video_device *video_device;
2096         union acpi_object *buffer = NULL;
2097         acpi_status status;
2098         int i, length;
2099
2100         if (!device || !acpi_driver_data(device))
2101                 return -EINVAL;
2102
2103         video = acpi_driver_data(device);
2104
2105         for (i = 0; i < video->attached_count; i++) {
2106                 video_device = video->attached_array[i].bind_info;
2107                 length = 256;
2108
2109                 if (!video_device)
2110                         continue;
2111
2112                 if (type) {
2113                         switch (type) {
2114                         case ACPI_VIDEO_DISPLAY_CRT:
2115                                 if (!video_device->flags.crt)
2116                                         continue;
2117                                 break;
2118                         case ACPI_VIDEO_DISPLAY_TV:
2119                                 if (!video_device->flags.tvout)
2120                                         continue;
2121                                 break;
2122                         case ACPI_VIDEO_DISPLAY_DVI:
2123                                 if (!video_device->flags.dvi)
2124                                         continue;
2125                                 break;
2126                         case ACPI_VIDEO_DISPLAY_LCD:
2127                                 if (!video_device->flags.lcd)
2128                                         continue;
2129                                 break;
2130                         }
2131                 } else if (video_device->device_id != device_id) {
2132                         continue;
2133                 }
2134
2135                 status = acpi_video_device_EDID(video_device, &buffer, length);
2136
2137                 if (ACPI_FAILURE(status) || !buffer ||
2138                     buffer->type != ACPI_TYPE_BUFFER) {
2139                         length = 128;
2140                         status = acpi_video_device_EDID(video_device, &buffer,
2141                                                         length);
2142                         if (ACPI_FAILURE(status) || !buffer ||
2143                             buffer->type != ACPI_TYPE_BUFFER) {
2144                                 continue;
2145                         }
2146                 }
2147
2148                 *edid = buffer->buffer.pointer;
2149                 return length;
2150         }
2151
2152         return -ENODEV;
2153 }
2154 EXPORT_SYMBOL(acpi_video_get_edid);
2155
2156 static int
2157 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2158                            struct acpi_device *device)
2159 {
2160         int status = 0;
2161         struct acpi_device *dev;
2162
2163         acpi_video_device_enumerate(video);
2164
2165         list_for_each_entry(dev, &device->children, node) {
2166
2167                 status = acpi_video_bus_get_one_device(dev, video);
2168                 if (ACPI_FAILURE(status)) {
2169                         printk(KERN_WARNING PREFIX
2170                                         "Cant attach device");
2171                         continue;
2172                 }
2173         }
2174         return status;
2175 }
2176
2177 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2178 {
2179         acpi_status status;
2180         struct acpi_video_bus *video;
2181
2182
2183         if (!device || !device->video)
2184                 return -ENOENT;
2185
2186         video = device->video;
2187
2188         acpi_video_device_remove_fs(device->dev);
2189
2190         status = acpi_remove_notify_handler(device->dev->handle,
2191                                             ACPI_DEVICE_NOTIFY,
2192                                             acpi_video_device_notify);
2193         if (device->backlight) {
2194                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2195                 backlight_device_unregister(device->backlight);
2196                 device->backlight = NULL;
2197         }
2198         if (device->cooling_dev) {
2199                 sysfs_remove_link(&device->dev->dev.kobj,
2200                                   "thermal_cooling");
2201                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2202                                   "device");
2203                 thermal_cooling_device_unregister(device->cooling_dev);
2204                 device->cooling_dev = NULL;
2205         }
2206         video_output_unregister(device->output_dev);
2207
2208         return 0;
2209 }
2210
2211 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2212 {
2213         int status;
2214         struct acpi_video_device *dev, *next;
2215
2216         mutex_lock(&video->device_list_lock);
2217
2218         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2219
2220                 status = acpi_video_bus_put_one_device(dev);
2221                 if (ACPI_FAILURE(status))
2222                         printk(KERN_WARNING PREFIX
2223                                "hhuuhhuu bug in acpi video driver.\n");
2224
2225                 if (dev->brightness) {
2226                         kfree(dev->brightness->levels);
2227                         kfree(dev->brightness);
2228                 }
2229                 list_del(&dev->entry);
2230                 kfree(dev);
2231         }
2232
2233         mutex_unlock(&video->device_list_lock);
2234
2235         return 0;
2236 }
2237
2238 /* acpi_video interface */
2239
2240 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2241 {
2242         return acpi_video_bus_DOS(video, 0, 0);
2243 }
2244
2245 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2246 {
2247         return acpi_video_bus_DOS(video, 0, 1);
2248 }
2249
2250 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2251 {
2252         struct acpi_video_bus *video = acpi_driver_data(device);
2253         struct input_dev *input;
2254         int keycode = 0;
2255
2256         if (!video)
2257                 return;
2258
2259         input = video->input;
2260
2261         switch (event) {
2262         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2263                                          * most likely via hotkey. */
2264                 acpi_bus_generate_proc_event(device, event, 0);
2265                 keycode = KEY_SWITCHVIDEOMODE;
2266                 break;
2267
2268         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2269                                          * connector. */
2270                 acpi_video_device_enumerate(video);
2271                 acpi_video_device_rebind(video);
2272                 acpi_bus_generate_proc_event(device, event, 0);
2273                 keycode = KEY_SWITCHVIDEOMODE;
2274                 break;
2275
2276         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2277                 acpi_bus_generate_proc_event(device, event, 0);
2278                 keycode = KEY_SWITCHVIDEOMODE;
2279                 break;
2280         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2281                 acpi_bus_generate_proc_event(device, event, 0);
2282                 keycode = KEY_VIDEO_NEXT;
2283                 break;
2284         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2285                 acpi_bus_generate_proc_event(device, event, 0);
2286                 keycode = KEY_VIDEO_PREV;
2287                 break;
2288
2289         default:
2290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2291                                   "Unsupported event [0x%x]\n", event));
2292                 break;
2293         }
2294
2295         acpi_notifier_call_chain(device, event, 0);
2296
2297         if (keycode) {
2298                 input_report_key(input, keycode, 1);
2299                 input_sync(input);
2300                 input_report_key(input, keycode, 0);
2301                 input_sync(input);
2302         }
2303
2304         return;
2305 }
2306
2307 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2308 {
2309         struct acpi_video_device *video_device = data;
2310         struct acpi_device *device = NULL;
2311         struct acpi_video_bus *bus;
2312         struct input_dev *input;
2313         int keycode = 0;
2314
2315         if (!video_device)
2316                 return;
2317
2318         device = video_device->dev;
2319         bus = video_device->video;
2320         input = bus->input;
2321
2322         switch (event) {
2323         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2324                 if (brightness_switch_enabled)
2325                         acpi_video_switch_brightness(video_device, event);
2326                 acpi_bus_generate_proc_event(device, event, 0);
2327                 keycode = KEY_BRIGHTNESS_CYCLE;
2328                 break;
2329         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2330                 if (brightness_switch_enabled)
2331                         acpi_video_switch_brightness(video_device, event);
2332                 acpi_bus_generate_proc_event(device, event, 0);
2333                 keycode = KEY_BRIGHTNESSUP;
2334                 break;
2335         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2336                 if (brightness_switch_enabled)
2337                         acpi_video_switch_brightness(video_device, event);
2338                 acpi_bus_generate_proc_event(device, event, 0);
2339                 keycode = KEY_BRIGHTNESSDOWN;
2340                 break;
2341         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2342                 if (brightness_switch_enabled)
2343                         acpi_video_switch_brightness(video_device, event);
2344                 acpi_bus_generate_proc_event(device, event, 0);
2345                 keycode = KEY_BRIGHTNESS_ZERO;
2346                 break;
2347         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2348                 if (brightness_switch_enabled)
2349                         acpi_video_switch_brightness(video_device, event);
2350                 acpi_bus_generate_proc_event(device, event, 0);
2351                 keycode = KEY_DISPLAY_OFF;
2352                 break;
2353         default:
2354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2355                                   "Unsupported event [0x%x]\n", event));
2356                 break;
2357         }
2358
2359         acpi_notifier_call_chain(device, event, 0);
2360
2361         if (keycode) {
2362                 input_report_key(input, keycode, 1);
2363                 input_sync(input);
2364                 input_report_key(input, keycode, 0);
2365                 input_sync(input);
2366         }
2367
2368         return;
2369 }
2370
2371 static int acpi_video_resume(struct notifier_block *nb,
2372                                 unsigned long val, void *ign)
2373 {
2374         struct acpi_video_bus *video;
2375         struct acpi_video_device *video_device;
2376         int i;
2377
2378         switch (val) {
2379         case PM_HIBERNATION_PREPARE:
2380         case PM_SUSPEND_PREPARE:
2381         case PM_RESTORE_PREPARE:
2382                 return NOTIFY_DONE;
2383         }
2384
2385         video = container_of(nb, struct acpi_video_bus, pm_nb);
2386
2387         dev_info(&video->device->dev, "Restoring backlight state\n");
2388
2389         for (i = 0; i < video->attached_count; i++) {
2390                 video_device = video->attached_array[i].bind_info;
2391                 if (video_device && video_device->backlight)
2392                         acpi_video_set_brightness(video_device->backlight);
2393         }
2394
2395         return NOTIFY_OK;
2396 }
2397
2398 static acpi_status
2399 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2400                         void **return_value)
2401 {
2402         struct acpi_device *device = context;
2403         struct acpi_device *sibling;
2404         int result;
2405
2406         if (handle == device->handle)
2407                 return AE_CTRL_TERMINATE;
2408
2409         result = acpi_bus_get_device(handle, &sibling);
2410         if (result)
2411                 return AE_OK;
2412
2413         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2414                         return AE_ALREADY_EXISTS;
2415
2416         return AE_OK;
2417 }
2418
2419 static int instance;
2420
2421 static int acpi_video_bus_add(struct acpi_device *device)
2422 {
2423         struct acpi_video_bus *video;
2424         struct input_dev *input;
2425         int error;
2426         acpi_status status;
2427
2428         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2429                                 device->parent->handle, 1,
2430                                 acpi_video_bus_match, NULL,
2431                                 device, NULL);
2432         if (status == AE_ALREADY_EXISTS) {
2433                 printk(KERN_WARNING FW_BUG
2434                         "Duplicate ACPI video bus devices for the"
2435                         " same VGA controller, please try module "
2436                         "parameter \"video.allow_duplicates=1\""
2437                         "if the current driver doesn't work.\n");
2438                 if (!allow_duplicates)
2439                         return -ENODEV;
2440         }
2441
2442         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2443         if (!video)
2444                 return -ENOMEM;
2445
2446         /* a hack to fix the duplicate name "VID" problem on T61 */
2447         if (!strcmp(device->pnp.bus_id, "VID")) {
2448                 if (instance)
2449                         device->pnp.bus_id[3] = '0' + instance;
2450                 instance ++;
2451         }
2452         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2453         if (!strcmp(device->pnp.bus_id, "VGA")) {
2454                 if (instance)
2455                         device->pnp.bus_id[3] = '0' + instance;
2456                 instance++;
2457         }
2458
2459         video->device = device;
2460         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2461         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2462         device->driver_data = video;
2463
2464         acpi_video_bus_find_cap(video);
2465         error = acpi_video_bus_check(video);
2466         if (error)
2467                 goto err_free_video;
2468
2469         error = acpi_video_bus_add_fs(device);
2470         if (error)
2471                 goto err_free_video;
2472
2473         mutex_init(&video->device_list_lock);
2474         INIT_LIST_HEAD(&video->video_device_list);
2475
2476         acpi_video_bus_get_devices(video, device);
2477         acpi_video_bus_start_devices(video);
2478
2479         video->input = input = input_allocate_device();
2480         if (!input) {
2481                 error = -ENOMEM;
2482                 goto err_stop_video;
2483         }
2484
2485         snprintf(video->phys, sizeof(video->phys),
2486                 "%s/video/input0", acpi_device_hid(video->device));
2487
2488         input->name = acpi_device_name(video->device);
2489         input->phys = video->phys;
2490         input->id.bustype = BUS_HOST;
2491         input->id.product = 0x06;
2492         input->dev.parent = &device->dev;
2493         input->evbit[0] = BIT(EV_KEY);
2494         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2495         set_bit(KEY_VIDEO_NEXT, input->keybit);
2496         set_bit(KEY_VIDEO_PREV, input->keybit);
2497         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2498         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2499         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2500         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2501         set_bit(KEY_DISPLAY_OFF, input->keybit);
2502
2503         error = input_register_device(input);
2504         if (error)
2505                 goto err_free_input_dev;
2506
2507         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2508                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2509                video->flags.multihead ? "yes" : "no",
2510                video->flags.rom ? "yes" : "no",
2511                video->flags.post ? "yes" : "no");
2512
2513         video->pm_nb.notifier_call = acpi_video_resume;
2514         video->pm_nb.priority = 0;
2515         register_pm_notifier(&video->pm_nb);
2516
2517         return 0;
2518
2519  err_free_input_dev:
2520         input_free_device(input);
2521  err_stop_video:
2522         acpi_video_bus_stop_devices(video);
2523         acpi_video_bus_put_devices(video);
2524         kfree(video->attached_array);
2525         acpi_video_bus_remove_fs(device);
2526  err_free_video:
2527         kfree(video);
2528         device->driver_data = NULL;
2529
2530         return error;
2531 }
2532
2533 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2534 {
2535         struct acpi_video_bus *video = NULL;
2536
2537
2538         if (!device || !acpi_driver_data(device))
2539                 return -EINVAL;
2540
2541         video = acpi_driver_data(device);
2542
2543         unregister_pm_notifier(&video->pm_nb);
2544
2545         acpi_video_bus_stop_devices(video);
2546         acpi_video_bus_put_devices(video);
2547         acpi_video_bus_remove_fs(device);
2548
2549         input_unregister_device(video->input);
2550         kfree(video->attached_array);
2551         kfree(video);
2552
2553         return 0;
2554 }
2555
2556 static int __init intel_opregion_present(void)
2557 {
2558 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2559         struct pci_dev *dev = NULL;
2560         u32 address;
2561
2562         for_each_pci_dev(dev) {
2563                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2564                         continue;
2565                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2566                         continue;
2567                 pci_read_config_dword(dev, 0xfc, &address);
2568                 if (!address)
2569                         continue;
2570                 return 1;
2571         }
2572 #endif
2573         return 0;
2574 }
2575
2576 int acpi_video_register(void)
2577 {
2578         int result = 0;
2579         if (register_count) {
2580                 /*
2581                  * if the function of acpi_video_register is already called,
2582                  * don't register the acpi_vide_bus again and return no error.
2583                  */
2584                 return 0;
2585         }
2586
2587 #ifdef CONFIG_ACPI_PROCFS
2588         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2589         if (!acpi_video_dir)
2590                 return -ENODEV;
2591 #endif
2592
2593         result = acpi_bus_register_driver(&acpi_video_bus);
2594         if (result < 0) {
2595                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2596                 return -ENODEV;
2597         }
2598
2599         /*
2600          * When the acpi_video_bus is loaded successfully, increase
2601          * the counter reference.
2602          */
2603         register_count = 1;
2604
2605         return 0;
2606 }
2607 EXPORT_SYMBOL(acpi_video_register);
2608
2609 void acpi_video_unregister(void)
2610 {
2611         if (!register_count) {
2612                 /*
2613                  * If the acpi video bus is already unloaded, don't
2614                  * unload it again and return directly.
2615                  */
2616                 return;
2617         }
2618         acpi_bus_unregister_driver(&acpi_video_bus);
2619
2620 #ifdef CONFIG_ACPI_PROCFS
2621         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2622 #endif
2623
2624         register_count = 0;
2625
2626         return;
2627 }
2628 EXPORT_SYMBOL(acpi_video_unregister);
2629
2630 /*
2631  * This is kind of nasty. Hardware using Intel chipsets may require
2632  * the video opregion code to be run first in order to initialise
2633  * state before any ACPI video calls are made. To handle this we defer
2634  * registration of the video class until the opregion code has run.
2635  */
2636
2637 static int __init acpi_video_init(void)
2638 {
2639         dmi_check_system(video_dmi_table);
2640
2641         if (intel_opregion_present())
2642                 return 0;
2643
2644         return acpi_video_register();
2645 }
2646
2647 static void __exit acpi_video_exit(void)
2648 {
2649         acpi_video_unregister();
2650
2651         return;
2652 }
2653
2654 module_init(acpi_video_init);
2655 module_exit(acpi_video_exit);