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