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