drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/list.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33
  34 #include <asm/uaccess.h>
  35
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38
  39 #define ACPI_VIDEO_COMPONENT            0x08000000
  40 #define ACPI_VIDEO_CLASS                "video"
  41 #define ACPI_VIDEO_DRIVER_NAME          "ACPI Video Driver"
  42 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  43 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  44 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  45 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  46 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  47 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  48 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  49
  50 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x82
  51 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x83
  52 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x84
  53 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x85
  54 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x86
  55
  56 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  57 #define ACPI_VIDEO_HEAD_END             (~0u)
  58
  59 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  60 ACPI_MODULE_NAME("acpi_video")
  61
  62     MODULE_AUTHOR("Bruno Ducrot");
  63 MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
  64 MODULE_LICENSE("GPL");
  65
  66 static int acpi_video_bus_add(struct acpi_device *device);
  67 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  68 static int acpi_video_bus_match(struct acpi_device *device,
  69                                 struct acpi_driver *driver);
  70
  71 static struct acpi_driver acpi_video_bus = {
  72         .name = ACPI_VIDEO_DRIVER_NAME,
  73         .class = ACPI_VIDEO_CLASS,
  74         .ops = {
  75                 .add = acpi_video_bus_add,
  76                 .remove = acpi_video_bus_remove,
  77                 .match = acpi_video_bus_match,
  78                 },
  79 };
  80
  81 struct acpi_video_bus_flags {
  82         u8 multihead:1;         /* can switch video heads */
  83         u8 rom:1;               /* can retrieve a video rom */
  84         u8 post:1;              /* can configure the head to */
  85         u8 reserved:5;
  86 };
  87
  88 struct acpi_video_bus_cap {
  89         u8 _DOS:1;              /*Enable/Disable output switching */
  90         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
  91         u8 _ROM:1;              /*Get ROM Data */
  92         u8 _GPD:1;              /*Get POST Device */
  93         u8 _SPD:1;              /*Set POST Device */
  94         u8 _VPO:1;              /*Video POST Options */
  95         u8 reserved:2;
  96 };
  97
  98 struct acpi_video_device_attrib {
  99         u32 display_index:4;    /* A zero-based instance of the Display */
 100         u32 display_port_attachment:4;  /*This field differenates displays type */
 101         u32 display_type:4;     /*Describe the specific type in use */
 102         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
 103         u32 bios_can_detect:1;  /*BIOS can detect the device */
 104         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 105                                    the VGA device. */
 106         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 107         u32 reserved:10;        /*Must be 0 */
 108         u32 device_id_scheme:1; /*Device ID Scheme */
 109 };
 110
 111 struct acpi_video_enumerated_device {
 112         union {
 113                 u32 int_val;
 114                 struct acpi_video_device_attrib attrib;
 115         } value;
 116         struct acpi_video_device *bind_info;
 117 };
 118
 119 struct acpi_video_bus {
 120         acpi_handle handle;
 121         u8 dos_setting;
 122         struct acpi_video_enumerated_device *attached_array;
 123         u8 attached_count;
 124         struct acpi_video_bus_cap cap;
 125         struct acpi_video_bus_flags flags;
 126         struct semaphore sem;
 127         struct list_head video_device_list;
 128         struct proc_dir_entry *dir;
 129 };
 130
 131 struct acpi_video_device_flags {
 132         u8 crt:1;
 133         u8 lcd:1;
 134         u8 tvout:1;
 135         u8 bios:1;
 136         u8 unknown:1;
 137         u8 reserved:3;
 138 };
 139
 140 struct acpi_video_device_cap {
 141         u8 _ADR:1;              /*Return the unique ID */
 142         u8 _BCL:1;              /*Query list of brightness control levels supported */
 143         u8 _BCM:1;              /*Set the brightness level */
 144         u8 _DDC:1;              /*Return the EDID for this device */
 145         u8 _DCS:1;              /*Return status of output device */
 146         u8 _DGS:1;              /*Query graphics state */
 147         u8 _DSS:1;              /*Device state set */
 148         u8 _reserved:1;
 149 };
 150
 151 struct acpi_video_device_brightness {
 152         int curr;
 153         int count;
 154         int *levels;
 155 };
 156
 157 struct acpi_video_device {
 158         acpi_handle handle;
 159         unsigned long device_id;
 160         struct acpi_video_device_flags flags;
 161         struct acpi_video_device_cap cap;
 162         struct list_head entry;
 163         struct acpi_video_bus *video;
 164         struct acpi_device *dev;
 165         struct acpi_video_device_brightness *brightness;
 166 };
 167
 168 /* bus */
 169 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 170 static struct file_operations acpi_video_bus_info_fops = {
 171         .open = acpi_video_bus_info_open_fs,
 172         .read = seq_read,
 173         .llseek = seq_lseek,
 174         .release = single_release,
 175 };
 176
 177 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 178 static struct file_operations acpi_video_bus_ROM_fops = {
 179         .open = acpi_video_bus_ROM_open_fs,
 180         .read = seq_read,
 181         .llseek = seq_lseek,
 182         .release = single_release,
 183 };
 184
 185 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 186                                             struct file *file);
 187 static struct file_operations acpi_video_bus_POST_info_fops = {
 188         .open = acpi_video_bus_POST_info_open_fs,
 189         .read = seq_read,
 190         .llseek = seq_lseek,
 191         .release = single_release,
 192 };
 193
 194 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 195 static struct file_operations acpi_video_bus_POST_fops = {
 196         .open = acpi_video_bus_POST_open_fs,
 197         .read = seq_read,
 198         .llseek = seq_lseek,
 199         .release = single_release,
 200 };
 201
 202 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 203 static struct file_operations acpi_video_bus_DOS_fops = {
 204         .open = acpi_video_bus_DOS_open_fs,
 205         .read = seq_read,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 /* device */
 211 static int acpi_video_device_info_open_fs(struct inode *inode,
 212                                           struct file *file);
 213 static struct file_operations acpi_video_device_info_fops = {
 214         .open = acpi_video_device_info_open_fs,
 215         .read = seq_read,
 216         .llseek = seq_lseek,
 217         .release = single_release,
 218 };
 219
 220 static int acpi_video_device_state_open_fs(struct inode *inode,
 221                                            struct file *file);
 222 static struct file_operations acpi_video_device_state_fops = {
 223         .open = acpi_video_device_state_open_fs,
 224         .read = seq_read,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 230                                                 struct file *file);
 231 static struct file_operations acpi_video_device_brightness_fops = {
 232         .open = acpi_video_device_brightness_open_fs,
 233         .read = seq_read,
 234         .llseek = seq_lseek,
 235         .release = single_release,
 236 };
 237
 238 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 239                                           struct file *file);
 240 static struct file_operations acpi_video_device_EDID_fops = {
 241         .open = acpi_video_device_EDID_open_fs,
 242         .read = seq_read,
 243         .llseek = seq_lseek,
 244         .release = single_release,
 245 };
 246
 247 static char device_decode[][30] = {
 248         "motherboard VGA device",
 249         "PCI VGA device",
 250         "AGP VGA device",
 251         "UNKNOWN",
 252 };
 253
 254 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 255 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 256 static void acpi_video_device_bind(struct acpi_video_bus *video,
 257                                    struct acpi_video_device *device);
 258 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 259 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 260 static int acpi_video_get_next_level(struct acpi_video_device *device,
 261                                      u32 level_current, u32 event);
 262 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 263                                          int event);
 264
 265 /* --------------------------------------------------------------------------
 266                                Video Management
 267    -------------------------------------------------------------------------- */
 268
 269 /* device */
 270
 271 static int
 272 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 273 {
 274         int status;
 275         ACPI_FUNCTION_TRACE("acpi_video_device_query");
 276         status = acpi_evaluate_integer(device->handle, "_DGS", NULL, state);
 277
 278         return_VALUE(status);
 279 }
 280
 281 static int
 282 acpi_video_device_get_state(struct acpi_video_device *device,
 283                             unsigned long *state)
 284 {
 285         int status;
 286
 287         ACPI_FUNCTION_TRACE("acpi_video_device_get_state");
 288
 289         status = acpi_evaluate_integer(device->handle, "_DCS", NULL, state);
 290
 291         return_VALUE(status);
 292 }
 293
 294 static int
 295 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 296 {
 297         int status;
 298         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 299         struct acpi_object_list args = { 1, &arg0 };
 300         unsigned long ret;
 301
 302         ACPI_FUNCTION_TRACE("acpi_video_device_set_state");
 303
 304         arg0.integer.value = state;
 305         status = acpi_evaluate_integer(device->handle, "_DSS", &args, &ret);
 306
 307         return_VALUE(status);
 308 }
 309
 310 static int
 311 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 312                                    union acpi_object **levels)
 313 {
 314         int status;
 315         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 316         union acpi_object *obj;
 317
 318         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_query_levels");
 319
 320         *levels = NULL;
 321
 322         status = acpi_evaluate_object(device->handle, "_BCL", NULL, &buffer);
 323         if (!ACPI_SUCCESS(status))
 324                 return_VALUE(status);
 325         obj = (union acpi_object *)buffer.pointer;
 326         if (!obj && (obj->type != ACPI_TYPE_PACKAGE)) {
 327                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _BCL data\n"));
 328                 status = -EFAULT;
 329                 goto err;
 330         }
 331
 332         *levels = obj;
 333
 334         return_VALUE(0);
 335
 336       err:
 337         if (buffer.pointer)
 338                 kfree(buffer.pointer);
 339
 340         return_VALUE(status);
 341 }
 342
 343 static int
 344 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 345 {
 346         int status;
 347         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 348         struct acpi_object_list args = { 1, &arg0 };
 349
 350         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_set_level");
 351
 352         arg0.integer.value = level;
 353         status = acpi_evaluate_object(device->handle, "_BCM", &args, NULL);
 354
 355         printk(KERN_DEBUG "set_level status: %x\n", status);
 356         return_VALUE(status);
 357 }
 358
 359 static int
 360 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 361                                         unsigned long *level)
 362 {
 363         int status;
 364         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_get_level_current");
 365
 366         status = acpi_evaluate_integer(device->handle, "_BQC", NULL, level);
 367
 368         return_VALUE(status);
 369 }
 370
 371 static int
 372 acpi_video_device_EDID(struct acpi_video_device *device,
 373                        union acpi_object **edid, ssize_t length)
 374 {
 375         int status;
 376         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 377         union acpi_object *obj;
 378         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 379         struct acpi_object_list args = { 1, &arg0 };
 380
 381         ACPI_FUNCTION_TRACE("acpi_video_device_get_EDID");
 382
 383         *edid = NULL;
 384
 385         if (!device)
 386                 return_VALUE(-ENODEV);
 387         if (length == 128)
 388                 arg0.integer.value = 1;
 389         else if (length == 256)
 390                 arg0.integer.value = 2;
 391         else
 392                 return_VALUE(-EINVAL);
 393
 394         status = acpi_evaluate_object(device->handle, "_DDC", &args, &buffer);
 395         if (ACPI_FAILURE(status))
 396                 return_VALUE(-ENODEV);
 397
 398         obj = (union acpi_object *)buffer.pointer;
 399
 400         if (obj && obj->type == ACPI_TYPE_BUFFER)
 401                 *edid = obj;
 402         else {
 403                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DDC data\n"));
 404                 status = -EFAULT;
 405                 kfree(obj);
 406         }
 407
 408         return_VALUE(status);
 409 }
 410
 411 /* bus */
 412
 413 static int
 414 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 415 {
 416         int status;
 417         unsigned long tmp;
 418         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 419         struct acpi_object_list args = { 1, &arg0 };
 420
 421         ACPI_FUNCTION_TRACE("acpi_video_bus_set_POST");
 422
 423         arg0.integer.value = option;
 424
 425         status = acpi_evaluate_integer(video->handle, "_SPD", &args, &tmp);
 426         if (ACPI_SUCCESS(status))
 427                 status = tmp ? (-EINVAL) : (AE_OK);
 428
 429         return_VALUE(status);
 430 }
 431
 432 static int
 433 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 434 {
 435         int status;
 436
 437         ACPI_FUNCTION_TRACE("acpi_video_bus_get_POST");
 438
 439         status = acpi_evaluate_integer(video->handle, "_GPD", NULL, id);
 440
 441         return_VALUE(status);
 442 }
 443
 444 static int
 445 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 446                             unsigned long *options)
 447 {
 448         int status;
 449         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_options");
 450
 451         status = acpi_evaluate_integer(video->handle, "_VPO", NULL, options);
 452         *options &= 3;
 453
 454         return_VALUE(status);
 455 }
 456
 457 /*
 458  *  Arg:
 459  *      video           : video bus device pointer
 460  *      bios_flag       :
 461  *              0.      The system BIOS should NOT automatically switch(toggle)
 462  *                      the active display output.
 463  *              1.      The system BIOS should automatically switch (toggle) the
 464  *                      active display output. No swich event.
 465  *              2.      The _DGS value should be locked.
 466  *              3.      The system BIOS should not automatically switch (toggle) the
 467  *                      active display output, but instead generate the display switch
 468  *                      event notify code.
 469  *      lcd_flag        :
 470  *              0.      The system BIOS should automatically control the brightness level
 471  *                      of the LCD, when the power changes from AC to DC
 472  *              1.      The system BIOS should NOT automatically control the brightness
 473  *                      level of the LCD, when the power changes from AC to DC.
 474  * Return Value:
 475  *              -1      wrong arg.
 476  */
 477
 478 static int
 479 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 480 {
 481         acpi_integer status = 0;
 482         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 483         struct acpi_object_list args = { 1, &arg0 };
 484
 485         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS");
 486
 487         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 488                 status = -1;
 489                 goto Failed;
 490         }
 491         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 492         video->dos_setting = arg0.integer.value;
 493         acpi_evaluate_object(video->handle, "_DOS", &args, NULL);
 494
 495       Failed:
 496         return_VALUE(status);
 497 }
 498
 499 /*
 500  *  Arg:
 501  *      device  : video output device (LCD, CRT, ..)
 502  *
 503  *  Return Value:
 504  *      None
 505  *
 506  *  Find out all required AML method defined under the output
 507  *  device.
 508  */
 509
 510 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 511 {
 512         acpi_integer status;
 513         acpi_handle h_dummy1;
 514         int i;
 515         union acpi_object *obj = NULL;
 516         struct acpi_video_device_brightness *br = NULL;
 517
 518         ACPI_FUNCTION_TRACE("acpi_video_device_find_cap");
 519
 520         memset(&device->cap, 0, 4);
 521
 522         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ADR", &h_dummy1))) {
 523                 device->cap._ADR = 1;
 524         }
 525         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCL", &h_dummy1))) {
 526                 device->cap._BCL = 1;
 527         }
 528         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCM", &h_dummy1))) {
 529                 device->cap._BCM = 1;
 530         }
 531         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DDC", &h_dummy1))) {
 532                 device->cap._DDC = 1;
 533         }
 534         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DCS", &h_dummy1))) {
 535                 device->cap._DCS = 1;
 536         }
 537         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DGS", &h_dummy1))) {
 538                 device->cap._DGS = 1;
 539         }
 540         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DSS", &h_dummy1))) {
 541                 device->cap._DSS = 1;
 542         }
 543
 544         status = acpi_video_device_lcd_query_levels(device, &obj);
 545
 546         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 547                 int count = 0;
 548                 union acpi_object *o;
 549
 550                 br = kmalloc(sizeof(*br), GFP_KERNEL);
 551                 if (!br) {
 552                         printk(KERN_ERR "can't allocate memory\n");
 553                 } else {
 554                         memset(br, 0, sizeof(*br));
 555                         br->levels = kmalloc(obj->package.count *
 556                                              sizeof *(br->levels), GFP_KERNEL);
 557                         if (!br->levels)
 558                                 goto out;
 559
 560                         for (i = 0; i < obj->package.count; i++) {
 561                                 o = (union acpi_object *)&obj->package.
 562                                     elements[i];
 563                                 if (o->type != ACPI_TYPE_INTEGER) {
 564                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 565                                                           "Invalid data\n"));
 566                                         continue;
 567                                 }
 568                                 br->levels[count] = (u32) o->integer.value;
 569                                 count++;
 570                         }
 571                       out:
 572                         if (count < 2) {
 573                                 kfree(br->levels);
 574                                 kfree(br);
 575                         } else {
 576                                 br->count = count;
 577                                 device->brightness = br;
 578                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 579                                                   "found %d brightness levels\n",
 580                                                   count));
 581                         }
 582                 }
 583         }
 584
 585         kfree(obj);
 586
 587         return_VOID;
 588 }
 589
 590 /*
 591  *  Arg:
 592  *      device  : video output device (VGA)
 593  *
 594  *  Return Value:
 595  *      None
 596  *
 597  *  Find out all required AML method defined under the video bus device.
 598  */
 599
 600 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 601 {
 602         acpi_handle h_dummy1;
 603
 604         memset(&video->cap, 0, 4);
 605         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOS", &h_dummy1))) {
 606                 video->cap._DOS = 1;
 607         }
 608         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOD", &h_dummy1))) {
 609                 video->cap._DOD = 1;
 610         }
 611         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_ROM", &h_dummy1))) {
 612                 video->cap._ROM = 1;
 613         }
 614         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_GPD", &h_dummy1))) {
 615                 video->cap._GPD = 1;
 616         }
 617         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_SPD", &h_dummy1))) {
 618                 video->cap._SPD = 1;
 619         }
 620         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_VPO", &h_dummy1))) {
 621                 video->cap._VPO = 1;
 622         }
 623 }
 624
 625 /*
 626  * Check whether the video bus device has required AML method to
 627  * support the desired features
 628  */
 629
 630 static int acpi_video_bus_check(struct acpi_video_bus *video)
 631 {
 632         acpi_status status = -ENOENT;
 633
 634         ACPI_FUNCTION_TRACE("acpi_video_bus_check");
 635
 636         if (!video)
 637                 return_VALUE(-EINVAL);
 638
 639         /* Since there is no HID, CID and so on for VGA driver, we have
 640          * to check well known required nodes.
 641          */
 642
 643         /* Does this device able to support video switching ? */
 644         if (video->cap._DOS) {
 645                 video->flags.multihead = 1;
 646                 status = 0;
 647         }
 648
 649         /* Does this device able to retrieve a retrieve a video ROM ? */
 650         if (video->cap._ROM) {
 651                 video->flags.rom = 1;
 652                 status = 0;
 653         }
 654
 655         /* Does this device able to configure which video device to POST ? */
 656         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 657                 video->flags.post = 1;
 658                 status = 0;
 659         }
 660
 661         return_VALUE(status);
 662 }
 663
 664 /* --------------------------------------------------------------------------
 665                               FS Interface (/proc)
 666    -------------------------------------------------------------------------- */
 667
 668 static struct proc_dir_entry *acpi_video_dir;
 669
 670 /* video devices */
 671
 672 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 673 {
 674         struct acpi_video_device *dev =
 675             (struct acpi_video_device *)seq->private;
 676
 677         ACPI_FUNCTION_TRACE("acpi_video_device_info_seq_show");
 678
 679         if (!dev)
 680                 goto end;
 681
 682         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 683         seq_printf(seq, "type:         ");
 684         if (dev->flags.crt)
 685                 seq_printf(seq, "CRT\n");
 686         else if (dev->flags.lcd)
 687                 seq_printf(seq, "LCD\n");
 688         else if (dev->flags.tvout)
 689                 seq_printf(seq, "TVOUT\n");
 690         else
 691                 seq_printf(seq, "UNKNOWN\n");
 692
 693         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 694
 695       end:
 696         return_VALUE(0);
 697 }
 698
 699 static int
 700 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 701 {
 702         return single_open(file, acpi_video_device_info_seq_show,
 703                            PDE(inode)->data);
 704 }
 705
 706 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 707 {
 708         int status;
 709         struct acpi_video_device *dev =
 710             (struct acpi_video_device *)seq->private;
 711         unsigned long state;
 712
 713         ACPI_FUNCTION_TRACE("acpi_video_device_state_seq_show");
 714
 715         if (!dev)
 716                 goto end;
 717
 718         status = acpi_video_device_get_state(dev, &state);
 719         seq_printf(seq, "state:     ");
 720         if (ACPI_SUCCESS(status))
 721                 seq_printf(seq, "0x%02lx\n", state);
 722         else
 723                 seq_printf(seq, "<not supported>\n");
 724
 725         status = acpi_video_device_query(dev, &state);
 726         seq_printf(seq, "query:     ");
 727         if (ACPI_SUCCESS(status))
 728                 seq_printf(seq, "0x%02lx\n", state);
 729         else
 730                 seq_printf(seq, "<not supported>\n");
 731
 732       end:
 733         return_VALUE(0);
 734 }
 735
 736 static int
 737 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 738 {
 739         return single_open(file, acpi_video_device_state_seq_show,
 740                            PDE(inode)->data);
 741 }
 742
 743 static ssize_t
 744 acpi_video_device_write_state(struct file *file,
 745                               const char __user * buffer,
 746                               size_t count, loff_t * data)
 747 {
 748         int status;
 749         struct seq_file *m = (struct seq_file *)file->private_data;
 750         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 751         char str[12] = { 0 };
 752         u32 state = 0;
 753
 754         ACPI_FUNCTION_TRACE("acpi_video_device_write_state");
 755
 756         if (!dev || count + 1 > sizeof str)
 757                 return_VALUE(-EINVAL);
 758
 759         if (copy_from_user(str, buffer, count))
 760                 return_VALUE(-EFAULT);
 761
 762         str[count] = 0;
 763         state = simple_strtoul(str, NULL, 0);
 764         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 765
 766         status = acpi_video_device_set_state(dev, state);
 767
 768         if (status)
 769                 return_VALUE(-EFAULT);
 770
 771         return_VALUE(count);
 772 }
 773
 774 static int
 775 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 776 {
 777         struct acpi_video_device *dev =
 778             (struct acpi_video_device *)seq->private;
 779         int i;
 780
 781         ACPI_FUNCTION_TRACE("acpi_video_device_brightness_seq_show");
 782
 783         if (!dev || !dev->brightness) {
 784                 seq_printf(seq, "<not supported>\n");
 785                 return_VALUE(0);
 786         }
 787
 788         seq_printf(seq, "levels: ");
 789         for (i = 0; i < dev->brightness->count; i++)
 790                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 791         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 792
 793         return_VALUE(0);
 794 }
 795
 796 static int
 797 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 798 {
 799         return single_open(file, acpi_video_device_brightness_seq_show,
 800                            PDE(inode)->data);
 801 }
 802
 803 static ssize_t
 804 acpi_video_device_write_brightness(struct file *file,
 805                                    const char __user * buffer,
 806                                    size_t count, loff_t * data)
 807 {
 808         struct seq_file *m = (struct seq_file *)file->private_data;
 809         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 810         char str[4] = { 0 };
 811         unsigned int level = 0;
 812         int i;
 813
 814         ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 815
 816         if (!dev || count + 1 > sizeof str)
 817                 return_VALUE(-EINVAL);
 818
 819         if (copy_from_user(str, buffer, count))
 820                 return_VALUE(-EFAULT);
 821
 822         str[count] = 0;
 823         level = simple_strtoul(str, NULL, 0);
 824
 825         if (level > 100)
 826                 return_VALUE(-EFAULT);
 827
 828         /* validate though the list of available levels */
 829         for (i = 0; i < dev->brightness->count; i++)
 830                 if (level == dev->brightness->levels[i]) {
 831                         if (ACPI_SUCCESS
 832                             (acpi_video_device_lcd_set_level(dev, level)))
 833                                 dev->brightness->curr = level;
 834                         break;
 835                 }
 836
 837         return_VALUE(count);
 838 }
 839
 840 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 841 {
 842         struct acpi_video_device *dev =
 843             (struct acpi_video_device *)seq->private;
 844         int status;
 845         int i;
 846         union acpi_object *edid = NULL;
 847
 848         ACPI_FUNCTION_TRACE("acpi_video_device_EDID_seq_show");
 849
 850         if (!dev)
 851                 goto out;
 852
 853         status = acpi_video_device_EDID(dev, &edid, 128);
 854         if (ACPI_FAILURE(status)) {
 855                 status = acpi_video_device_EDID(dev, &edid, 256);
 856         }
 857
 858         if (ACPI_FAILURE(status)) {
 859                 goto out;
 860         }
 861
 862         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 863                 for (i = 0; i < edid->buffer.length; i++)
 864                         seq_putc(seq, edid->buffer.pointer[i]);
 865         }
 866
 867       out:
 868         if (!edid)
 869                 seq_printf(seq, "<not supported>\n");
 870         else
 871                 kfree(edid);
 872
 873         return_VALUE(0);
 874 }
 875
 876 static int
 877 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 878 {
 879         return single_open(file, acpi_video_device_EDID_seq_show,
 880                            PDE(inode)->data);
 881 }
 882
 883 static int acpi_video_device_add_fs(struct acpi_device *device)
 884 {
 885         struct proc_dir_entry *entry = NULL;
 886         struct acpi_video_device *vid_dev;
 887
 888         ACPI_FUNCTION_TRACE("acpi_video_device_add_fs");
 889
 890         if (!device)
 891                 return_VALUE(-ENODEV);
 892
 893         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 894         if (!vid_dev)
 895                 return_VALUE(-ENODEV);
 896
 897         if (!acpi_device_dir(device)) {
 898                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 899                                                      vid_dev->video->dir);
 900                 if (!acpi_device_dir(device))
 901                         return_VALUE(-ENODEV);
 902                 acpi_device_dir(device)->owner = THIS_MODULE;
 903         }
 904
 905         /* 'info' [R] */
 906         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 907         if (!entry)
 908                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 909                                   "Unable to create 'info' fs entry\n"));
 910         else {
 911                 entry->proc_fops = &acpi_video_device_info_fops;
 912                 entry->data = acpi_driver_data(device);
 913                 entry->owner = THIS_MODULE;
 914         }
 915
 916         /* 'state' [R/W] */
 917         entry =
 918             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 919                               acpi_device_dir(device));
 920         if (!entry)
 921                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 922                                   "Unable to create 'state' fs entry\n"));
 923         else {
 924                 entry->proc_fops = &acpi_video_device_state_fops;
 925                 entry->proc_fops->write = acpi_video_device_write_state;
 926                 entry->data = acpi_driver_data(device);
 927                 entry->owner = THIS_MODULE;
 928         }
 929
 930         /* 'brightness' [R/W] */
 931         entry =
 932             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 933                               acpi_device_dir(device));
 934         if (!entry)
 935                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 936                                   "Unable to create 'brightness' fs entry\n"));
 937         else {
 938                 entry->proc_fops = &acpi_video_device_brightness_fops;
 939                 entry->proc_fops->write = acpi_video_device_write_brightness;
 940                 entry->data = acpi_driver_data(device);
 941                 entry->owner = THIS_MODULE;
 942         }
 943
 944         /* 'EDID' [R] */
 945         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 946         if (!entry)
 947                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 948                                   "Unable to create 'brightness' fs entry\n"));
 949         else {
 950                 entry->proc_fops = &acpi_video_device_EDID_fops;
 951                 entry->data = acpi_driver_data(device);
 952                 entry->owner = THIS_MODULE;
 953         }
 954
 955         return_VALUE(0);
 956 }
 957
 958 static int acpi_video_device_remove_fs(struct acpi_device *device)
 959 {
 960         struct acpi_video_device *vid_dev;
 961         ACPI_FUNCTION_TRACE("acpi_video_device_remove_fs");
 962
 963         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 964         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 965                 return_VALUE(-ENODEV);
 966
 967         if (acpi_device_dir(device)) {
 968                 remove_proc_entry("info", acpi_device_dir(device));
 969                 remove_proc_entry("state", acpi_device_dir(device));
 970                 remove_proc_entry("brightness", acpi_device_dir(device));
 971                 remove_proc_entry("EDID", acpi_device_dir(device));
 972                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
 973                 acpi_device_dir(device) = NULL;
 974         }
 975
 976         return_VALUE(0);
 977 }
 978
 979 /* video bus */
 980 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
 981 {
 982         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 983
 984         ACPI_FUNCTION_TRACE("acpi_video_bus_info_seq_show");
 985
 986         if (!video)
 987                 goto end;
 988
 989         seq_printf(seq, "Switching heads:              %s\n",
 990                    video->flags.multihead ? "yes" : "no");
 991         seq_printf(seq, "Video ROM:                    %s\n",
 992                    video->flags.rom ? "yes" : "no");
 993         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
 994                    video->flags.post ? "yes" : "no");
 995
 996       end:
 997         return_VALUE(0);
 998 }
 999
1000 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1001 {
1002         return single_open(file, acpi_video_bus_info_seq_show,
1003                            PDE(inode)->data);
1004 }
1005
1006 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1007 {
1008         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1009
1010         ACPI_FUNCTION_TRACE("acpi_video_bus_ROM_seq_show");
1011
1012         if (!video)
1013                 goto end;
1014
1015         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1016         seq_printf(seq, "<TODO>\n");
1017
1018       end:
1019         return_VALUE(0);
1020 }
1021
1022 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1023 {
1024         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1025 }
1026
1027 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1028 {
1029         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1030         unsigned long options;
1031         int status;
1032
1033         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_info_seq_show");
1034
1035         if (!video)
1036                 goto end;
1037
1038         status = acpi_video_bus_POST_options(video, &options);
1039         if (ACPI_SUCCESS(status)) {
1040                 if (!(options & 1)) {
1041                         printk(KERN_WARNING PREFIX
1042                                "The motherboard VGA device is not listed as a possible POST device.\n");
1043                         printk(KERN_WARNING PREFIX
1044                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1045                 }
1046                 printk("%lx\n", options);
1047                 seq_printf(seq, "can POST: <intgrated video>");
1048                 if (options & 2)
1049                         seq_printf(seq, " <PCI video>");
1050                 if (options & 4)
1051                         seq_printf(seq, " <AGP video>");
1052                 seq_putc(seq, '\n');
1053         } else
1054                 seq_printf(seq, "<not supported>\n");
1055       end:
1056         return_VALUE(0);
1057 }
1058
1059 static int
1060 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1061 {
1062         return single_open(file, acpi_video_bus_POST_info_seq_show,
1063                            PDE(inode)->data);
1064 }
1065
1066 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1067 {
1068         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1069         int status;
1070         unsigned long id;
1071
1072         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_seq_show");
1073
1074         if (!video)
1075                 goto end;
1076
1077         status = acpi_video_bus_get_POST(video, &id);
1078         if (!ACPI_SUCCESS(status)) {
1079                 seq_printf(seq, "<not supported>\n");
1080                 goto end;
1081         }
1082         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1083
1084       end:
1085         return_VALUE(0);
1086 }
1087
1088 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1089 {
1090         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1091
1092         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS_seq_show");
1093
1094         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1095
1096         return_VALUE(0);
1097 }
1098
1099 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1100 {
1101         return single_open(file, acpi_video_bus_POST_seq_show,
1102                            PDE(inode)->data);
1103 }
1104
1105 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1106 {
1107         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1108 }
1109
1110 static ssize_t
1111 acpi_video_bus_write_POST(struct file *file,
1112                           const char __user * buffer,
1113                           size_t count, loff_t * data)
1114 {
1115         int status;
1116         struct seq_file *m = (struct seq_file *)file->private_data;
1117         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1118         char str[12] = { 0 };
1119         unsigned long opt, options;
1120
1121         ACPI_FUNCTION_TRACE("acpi_video_bus_write_POST");
1122
1123         if (!video || count + 1 > sizeof str)
1124                 return_VALUE(-EINVAL);
1125
1126         status = acpi_video_bus_POST_options(video, &options);
1127         if (!ACPI_SUCCESS(status))
1128                 return_VALUE(-EINVAL);
1129
1130         if (copy_from_user(str, buffer, count))
1131                 return_VALUE(-EFAULT);
1132
1133         str[count] = 0;
1134         opt = strtoul(str, NULL, 0);
1135         if (opt > 3)
1136                 return_VALUE(-EFAULT);
1137
1138         /* just in case an OEM 'forget' the motherboard... */
1139         options |= 1;
1140
1141         if (options & (1ul << opt)) {
1142                 status = acpi_video_bus_set_POST(video, opt);
1143                 if (!ACPI_SUCCESS(status))
1144                         return_VALUE(-EFAULT);
1145
1146         }
1147
1148         return_VALUE(count);
1149 }
1150
1151 static ssize_t
1152 acpi_video_bus_write_DOS(struct file *file,
1153                          const char __user * buffer,
1154                          size_t count, loff_t * data)
1155 {
1156         int status;
1157         struct seq_file *m = (struct seq_file *)file->private_data;
1158         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1159         char str[12] = { 0 };
1160         unsigned long opt;
1161
1162         ACPI_FUNCTION_TRACE("acpi_video_bus_write_DOS");
1163
1164         if (!video || count + 1 > sizeof str)
1165                 return_VALUE(-EINVAL);
1166
1167         if (copy_from_user(str, buffer, count))
1168                 return_VALUE(-EFAULT);
1169
1170         str[count] = 0;
1171         opt = strtoul(str, NULL, 0);
1172         if (opt > 7)
1173                 return_VALUE(-EFAULT);
1174
1175         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1176
1177         if (!ACPI_SUCCESS(status))
1178                 return_VALUE(-EFAULT);
1179
1180         return_VALUE(count);
1181 }
1182
1183 static int acpi_video_bus_add_fs(struct acpi_device *device)
1184 {
1185         struct proc_dir_entry *entry = NULL;
1186         struct acpi_video_bus *video;
1187
1188         ACPI_FUNCTION_TRACE("acpi_video_bus_add_fs");
1189
1190         video = (struct acpi_video_bus *)acpi_driver_data(device);
1191
1192         if (!acpi_device_dir(device)) {
1193                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1194                                                      acpi_video_dir);
1195                 if (!acpi_device_dir(device))
1196                         return_VALUE(-ENODEV);
1197                 video->dir = acpi_device_dir(device);
1198                 acpi_device_dir(device)->owner = THIS_MODULE;
1199         }
1200
1201         /* 'info' [R] */
1202         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1203         if (!entry)
1204                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1205                                   "Unable to create 'info' fs entry\n"));
1206         else {
1207                 entry->proc_fops = &acpi_video_bus_info_fops;
1208                 entry->data = acpi_driver_data(device);
1209                 entry->owner = THIS_MODULE;
1210         }
1211
1212         /* 'ROM' [R] */
1213         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1214         if (!entry)
1215                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1216                                   "Unable to create 'ROM' fs entry\n"));
1217         else {
1218                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1219                 entry->data = acpi_driver_data(device);
1220                 entry->owner = THIS_MODULE;
1221         }
1222
1223         /* 'POST_info' [R] */
1224         entry =
1225             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1226         if (!entry)
1227                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1228                                   "Unable to create 'POST_info' fs entry\n"));
1229         else {
1230                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1231                 entry->data = acpi_driver_data(device);
1232                 entry->owner = THIS_MODULE;
1233         }
1234
1235         /* 'POST' [R/W] */
1236         entry =
1237             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1238                               acpi_device_dir(device));
1239         if (!entry)
1240                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1241                                   "Unable to create 'POST' fs entry\n"));
1242         else {
1243                 entry->proc_fops = &acpi_video_bus_POST_fops;
1244                 entry->proc_fops->write = acpi_video_bus_write_POST;
1245                 entry->data = acpi_driver_data(device);
1246                 entry->owner = THIS_MODULE;
1247         }
1248
1249         /* 'DOS' [R/W] */
1250         entry =
1251             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1252                               acpi_device_dir(device));
1253         if (!entry)
1254                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1255                                   "Unable to create 'DOS' fs entry\n"));
1256         else {
1257                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1258                 entry->proc_fops->write = acpi_video_bus_write_DOS;
1259                 entry->data = acpi_driver_data(device);
1260                 entry->owner = THIS_MODULE;
1261         }
1262
1263         return_VALUE(0);
1264 }
1265
1266 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1267 {
1268         struct acpi_video_bus *video;
1269
1270         ACPI_FUNCTION_TRACE("acpi_video_bus_remove_fs");
1271
1272         video = (struct acpi_video_bus *)acpi_driver_data(device);
1273
1274         if (acpi_device_dir(device)) {
1275                 remove_proc_entry("info", acpi_device_dir(device));
1276                 remove_proc_entry("ROM", acpi_device_dir(device));
1277                 remove_proc_entry("POST_info", acpi_device_dir(device));
1278                 remove_proc_entry("POST", acpi_device_dir(device));
1279                 remove_proc_entry("DOS", acpi_device_dir(device));
1280                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1281                 acpi_device_dir(device) = NULL;
1282         }
1283
1284         return_VALUE(0);
1285 }
1286
1287 /* --------------------------------------------------------------------------
1288                                  Driver Interface
1289    -------------------------------------------------------------------------- */
1290
1291 /* device interface */
1292
1293 static int
1294 acpi_video_bus_get_one_device(struct acpi_device *device,
1295                               struct acpi_video_bus *video)
1296 {
1297         unsigned long device_id;
1298         int status, result;
1299         struct acpi_video_device *data;
1300
1301         ACPI_FUNCTION_TRACE("acpi_video_bus_get_one_device");
1302
1303         if (!device || !video)
1304                 return_VALUE(-EINVAL);
1305
1306         status =
1307             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1308         if (ACPI_SUCCESS(status)) {
1309
1310                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1311                 if (!data)
1312                         return_VALUE(-ENOMEM);
1313
1314                 memset(data, 0, sizeof(struct acpi_video_device));
1315
1316                 data->handle = device->handle;
1317                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1318                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1319                 acpi_driver_data(device) = data;
1320
1321                 data->device_id = device_id;
1322                 data->video = video;
1323                 data->dev = device;
1324
1325                 switch (device_id & 0xffff) {
1326                 case 0x0100:
1327                         data->flags.crt = 1;
1328                         break;
1329                 case 0x0400:
1330                         data->flags.lcd = 1;
1331                         break;
1332                 case 0x0200:
1333                         data->flags.tvout = 1;
1334                         break;
1335                 default:
1336                         data->flags.unknown = 1;
1337                         break;
1338                 }
1339
1340                 acpi_video_device_bind(video, data);
1341                 acpi_video_device_find_cap(data);
1342
1343                 status = acpi_install_notify_handler(data->handle,
1344                                                      ACPI_DEVICE_NOTIFY,
1345                                                      acpi_video_device_notify,
1346                                                      data);
1347                 if (ACPI_FAILURE(status)) {
1348                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1349                                           "Error installing notify handler\n"));
1350                         result = -ENODEV;
1351                         goto end;
1352                 }
1353
1354                 down(&video->sem);
1355                 list_add_tail(&data->entry, &video->video_device_list);
1356                 up(&video->sem);
1357
1358                 acpi_video_device_add_fs(device);
1359
1360                 return_VALUE(0);
1361         }
1362
1363       end:
1364         return_VALUE(-ENOENT);
1365 }
1366
1367 /*
1368  *  Arg:
1369  *      video   : video bus device
1370  *
1371  *  Return:
1372  *      none
1373  *
1374  *  Enumerate the video device list of the video bus,
1375  *  bind the ids with the corresponding video devices
1376  *  under the video bus.
1377  */
1378
1379 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1380 {
1381         struct list_head *node, *next;
1382         list_for_each_safe(node, next, &video->video_device_list) {
1383                 struct acpi_video_device *dev =
1384                     container_of(node, struct acpi_video_device, entry);
1385                 acpi_video_device_bind(video, dev);
1386         }
1387 }
1388
1389 /*
1390  *  Arg:
1391  *      video   : video bus device
1392  *      device  : video output device under the video
1393  *              bus
1394  *
1395  *  Return:
1396  *      none
1397  *
1398  *  Bind the ids with the corresponding video devices
1399  *  under the video bus.
1400  */
1401
1402 static void
1403 acpi_video_device_bind(struct acpi_video_bus *video,
1404                        struct acpi_video_device *device)
1405 {
1406         int i;
1407         ACPI_FUNCTION_TRACE("acpi_video_device_bind");
1408
1409 #define IDS_VAL(i) video->attached_array[i].value.int_val
1410 #define IDS_BIND(i) video->attached_array[i].bind_info
1411
1412         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1413              i < video->attached_count; i++) {
1414                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1415                         IDS_BIND(i) = device;
1416                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1417                 }
1418         }
1419 #undef IDS_VAL
1420 #undef IDS_BIND
1421 }
1422
1423 /*
1424  *  Arg:
1425  *      video   : video bus device
1426  *
1427  *  Return:
1428  *      < 0     : error
1429  *
1430  *  Call _DOD to enumerate all devices attached to display adapter
1431  *
1432  */
1433
1434 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1435 {
1436         int status;
1437         int count;
1438         int i;
1439         struct acpi_video_enumerated_device *active_device_list;
1440         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1441         union acpi_object *dod = NULL;
1442         union acpi_object *obj;
1443
1444         ACPI_FUNCTION_TRACE("acpi_video_device_enumerate");
1445
1446         status = acpi_evaluate_object(video->handle, "_DOD", NULL, &buffer);
1447         if (!ACPI_SUCCESS(status)) {
1448                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _DOD\n"));
1449                 return_VALUE(status);
1450         }
1451
1452         dod = (union acpi_object *)buffer.pointer;
1453         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1454                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1455                 status = -EFAULT;
1456                 goto out;
1457         }
1458
1459         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1460                           dod->package.count));
1461
1462         active_device_list = kmalloc((1 +
1463                                       dod->package.count) *
1464                                      sizeof(struct
1465                                             acpi_video_enumerated_device),
1466                                      GFP_KERNEL);
1467
1468         if (!active_device_list) {
1469                 status = -ENOMEM;
1470                 goto out;
1471         }
1472
1473         count = 0;
1474         for (i = 0; i < dod->package.count; i++) {
1475                 obj = (union acpi_object *)&dod->package.elements[i];
1476
1477                 if (obj->type != ACPI_TYPE_INTEGER) {
1478                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1479                                           "Invalid _DOD data\n"));
1480                         active_device_list[i].value.int_val =
1481                             ACPI_VIDEO_HEAD_INVALID;
1482                 }
1483                 active_device_list[i].value.int_val = obj->integer.value;
1484                 active_device_list[i].bind_info = NULL;
1485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1486                                   (int)obj->integer.value));
1487                 count++;
1488         }
1489         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1490
1491         if (video->attached_array)
1492                 kfree(video->attached_array);
1493
1494         video->attached_array = active_device_list;
1495         video->attached_count = count;
1496       out:
1497         acpi_os_free(buffer.pointer);
1498         return_VALUE(status);
1499 }
1500
1501 /*
1502  *  Arg:
1503  *      video   : video bus device
1504  *      event   : Nontify Event
1505  *
1506  *  Return:
1507  *      < 0     : error
1508  *
1509  *      1. Find out the current active output device.
1510  *      2. Identify the next output device to switch
1511  *      3. call _DSS to do actual switch.
1512  */
1513
1514 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1515 {
1516         struct list_head *node, *next;
1517         struct acpi_video_device *dev = NULL;
1518         struct acpi_video_device *dev_next = NULL;
1519         struct acpi_video_device *dev_prev = NULL;
1520         unsigned long state;
1521         int status = 0;
1522
1523         ACPI_FUNCTION_TRACE("acpi_video_switch_output");
1524
1525         list_for_each_safe(node, next, &video->video_device_list) {
1526                 dev = container_of(node, struct acpi_video_device, entry);
1527                 status = acpi_video_device_get_state(dev, &state);
1528                 if (state & 0x2) {
1529                         dev_next =
1530                             container_of(node->next, struct acpi_video_device,
1531                                          entry);
1532                         dev_prev =
1533                             container_of(node->prev, struct acpi_video_device,
1534                                          entry);
1535                         goto out;
1536                 }
1537         }
1538         dev_next = container_of(node->next, struct acpi_video_device, entry);
1539         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1540       out:
1541         switch (event) {
1542         case ACPI_VIDEO_NOTIFY_CYCLE:
1543         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1544                 acpi_video_device_set_state(dev, 0);
1545                 acpi_video_device_set_state(dev_next, 0x80000001);
1546                 break;
1547         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1548                 acpi_video_device_set_state(dev, 0);
1549                 acpi_video_device_set_state(dev_prev, 0x80000001);
1550         default:
1551                 break;
1552         }
1553
1554         return_VALUE(status);
1555 }
1556
1557 static int
1558 acpi_video_get_next_level(struct acpi_video_device *device,
1559                           u32 level_current, u32 event)
1560 {
1561         /*Fix me */
1562         return level_current;
1563 }
1564
1565 static void
1566 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1567 {
1568         unsigned long level_current, level_next;
1569         acpi_video_device_lcd_get_level_current(device, &level_current);
1570         level_next = acpi_video_get_next_level(device, level_current, event);
1571         acpi_video_device_lcd_set_level(device, level_next);
1572 }
1573
1574 static int
1575 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1576                            struct acpi_device *device)
1577 {
1578         int status = 0;
1579         struct list_head *node, *next;
1580
1581         ACPI_FUNCTION_TRACE("acpi_video_get_devices");
1582
1583         acpi_video_device_enumerate(video);
1584
1585         list_for_each_safe(node, next, &device->children) {
1586                 struct acpi_device *dev =
1587                     list_entry(node, struct acpi_device, node);
1588
1589                 if (!dev)
1590                         continue;
1591
1592                 status = acpi_video_bus_get_one_device(dev, video);
1593                 if (ACPI_FAILURE(status)) {
1594                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1595                                           "Cant attach device\n"));
1596                         continue;
1597                 }
1598
1599         }
1600         return_VALUE(status);
1601 }
1602
1603 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1604 {
1605         acpi_status status;
1606         struct acpi_video_bus *video;
1607
1608         ACPI_FUNCTION_TRACE("acpi_video_bus_put_one_device");
1609
1610         if (!device || !device->video)
1611                 return_VALUE(-ENOENT);
1612
1613         video = device->video;
1614
1615         down(&video->sem);
1616         list_del(&device->entry);
1617         up(&video->sem);
1618         acpi_video_device_remove_fs(device->dev);
1619
1620         status = acpi_remove_notify_handler(device->handle,
1621                                             ACPI_DEVICE_NOTIFY,
1622                                             acpi_video_device_notify);
1623         if (ACPI_FAILURE(status))
1624                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1625                                   "Error removing notify handler\n"));
1626
1627         return_VALUE(0);
1628 }
1629
1630 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1631 {
1632         int status;
1633         struct list_head *node, *next;
1634
1635         ACPI_FUNCTION_TRACE("acpi_video_bus_put_devices");
1636
1637         list_for_each_safe(node, next, &video->video_device_list) {
1638                 struct acpi_video_device *data =
1639                     list_entry(node, struct acpi_video_device, entry);
1640                 if (!data)
1641                         continue;
1642
1643                 status = acpi_video_bus_put_one_device(data);
1644                 if (ACPI_FAILURE(status))
1645                         printk(KERN_WARNING PREFIX
1646                                "hhuuhhuu bug in acpi video driver.\n");
1647
1648                 if (data->brightness)
1649                         kfree(data->brightness);
1650
1651                 kfree(data);
1652         }
1653
1654         return_VALUE(0);
1655 }
1656
1657 /* acpi_video interface */
1658
1659 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1660 {
1661         return acpi_video_bus_DOS(video, 1, 0);
1662 }
1663
1664 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1665 {
1666         return acpi_video_bus_DOS(video, 0, 1);
1667 }
1668
1669 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1670 {
1671         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1672         struct acpi_device *device = NULL;
1673
1674         ACPI_FUNCTION_TRACE("acpi_video_bus_notify");
1675         printk("video bus notify\n");
1676
1677         if (!video)
1678                 return_VOID;
1679
1680         if (acpi_bus_get_device(handle, &device))
1681                 return_VOID;
1682
1683         switch (event) {
1684         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1685                                          * most likely via hotkey. */
1686                 acpi_bus_generate_event(device, event, 0);
1687                 break;
1688
1689         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1690                                          * connector. */
1691                 acpi_video_device_enumerate(video);
1692                 acpi_video_device_rebind(video);
1693                 acpi_video_switch_output(video, event);
1694                 acpi_bus_generate_event(device, event, 0);
1695                 break;
1696
1697         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1698         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1699         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1700                 acpi_video_switch_output(video, event);
1701                 acpi_bus_generate_event(device, event, 0);
1702                 break;
1703
1704         default:
1705                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1706                                   "Unsupported event [0x%x]\n", event));
1707                 break;
1708         }
1709
1710         return_VOID;
1711 }
1712
1713 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1714 {
1715         struct acpi_video_device *video_device =
1716             (struct acpi_video_device *)data;
1717         struct acpi_device *device = NULL;
1718
1719         ACPI_FUNCTION_TRACE("acpi_video_device_notify");
1720
1721         printk("video device notify\n");
1722         if (!video_device)
1723                 return_VOID;
1724
1725         if (acpi_bus_get_device(handle, &device))
1726                 return_VOID;
1727
1728         switch (event) {
1729         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1730         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1731                 acpi_bus_generate_event(device, event, 0);
1732                 break;
1733         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1734         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1735         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1736         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1737         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1738                 acpi_video_switch_brightness(video_device, event);
1739                 acpi_bus_generate_event(device, event, 0);
1740                 break;
1741         default:
1742                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1743                                   "Unsupported event [0x%x]\n", event));
1744                 break;
1745         }
1746         return_VOID;
1747 }
1748
1749 static int acpi_video_bus_add(struct acpi_device *device)
1750 {
1751         int result = 0;
1752         acpi_status status = 0;
1753         struct acpi_video_bus *video = NULL;
1754
1755         ACPI_FUNCTION_TRACE("acpi_video_bus_add");
1756
1757         if (!device)
1758                 return_VALUE(-EINVAL);
1759
1760         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1761         if (!video)
1762                 return_VALUE(-ENOMEM);
1763         memset(video, 0, sizeof(struct acpi_video_bus));
1764
1765         video->handle = device->handle;
1766         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1767         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1768         acpi_driver_data(device) = video;
1769
1770         acpi_video_bus_find_cap(video);
1771         result = acpi_video_bus_check(video);
1772         if (result)
1773                 goto end;
1774
1775         result = acpi_video_bus_add_fs(device);
1776         if (result)
1777                 goto end;
1778
1779         init_MUTEX(&video->sem);
1780         INIT_LIST_HEAD(&video->video_device_list);
1781
1782         acpi_video_bus_get_devices(video, device);
1783         acpi_video_bus_start_devices(video);
1784
1785         status = acpi_install_notify_handler(video->handle,
1786                                              ACPI_DEVICE_NOTIFY,
1787                                              acpi_video_bus_notify, video);
1788         if (ACPI_FAILURE(status)) {
1789                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1790                                   "Error installing notify handler\n"));
1791                 result = -ENODEV;
1792                 goto end;
1793         }
1794
1795         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1796                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1797                video->flags.multihead ? "yes" : "no",
1798                video->flags.rom ? "yes" : "no",
1799                video->flags.post ? "yes" : "no");
1800
1801       end:
1802         if (result) {
1803                 acpi_video_bus_remove_fs(device);
1804                 kfree(video);
1805         }
1806
1807         return_VALUE(result);
1808 }
1809
1810 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1811 {
1812         acpi_status status = 0;
1813         struct acpi_video_bus *video = NULL;
1814
1815         ACPI_FUNCTION_TRACE("acpi_video_bus_remove");
1816
1817         if (!device || !acpi_driver_data(device))
1818                 return_VALUE(-EINVAL);
1819
1820         video = (struct acpi_video_bus *)acpi_driver_data(device);
1821
1822         acpi_video_bus_stop_devices(video);
1823
1824         status = acpi_remove_notify_handler(video->handle,
1825                                             ACPI_DEVICE_NOTIFY,
1826                                             acpi_video_bus_notify);
1827         if (ACPI_FAILURE(status))
1828                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1829                                   "Error removing notify handler\n"));
1830
1831         acpi_video_bus_put_devices(video);
1832         acpi_video_bus_remove_fs(device);
1833
1834         if (video->attached_array)
1835                 kfree(video->attached_array);
1836         kfree(video);
1837
1838         return_VALUE(0);
1839 }
1840
1841 static int
1842 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1843 {
1844         acpi_handle h_dummy1;
1845         acpi_handle h_dummy2;
1846         acpi_handle h_dummy3;
1847
1848         ACPI_FUNCTION_TRACE("acpi_video_bus_match");
1849
1850         if (!device || !driver)
1851                 return_VALUE(-EINVAL);
1852
1853         /* Since there is no HID, CID for ACPI Video drivers, we have
1854          * to check well known required nodes for each feature we support.
1855          */
1856
1857         /* Does this device able to support video switching ? */
1858         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1859             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1860                 return_VALUE(0);
1861
1862         /* Does this device able to retrieve a video ROM ? */
1863         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1864                 return_VALUE(0);
1865
1866         /* Does this device able to configure which video head to be POSTed ? */
1867         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1868             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1869             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1870                 return_VALUE(0);
1871
1872         return_VALUE(-ENODEV);
1873 }
1874
1875 static int __init acpi_video_init(void)
1876 {
1877         int result = 0;
1878
1879         ACPI_FUNCTION_TRACE("acpi_video_init");
1880
1881         /*
1882            acpi_dbg_level = 0xFFFFFFFF;
1883            acpi_dbg_layer = 0x08000000;
1884          */
1885
1886         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1887         if (!acpi_video_dir)
1888                 return_VALUE(-ENODEV);
1889         acpi_video_dir->owner = THIS_MODULE;
1890
1891         result = acpi_bus_register_driver(&acpi_video_bus);
1892         if (result < 0) {
1893                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1894                 return_VALUE(-ENODEV);
1895         }
1896
1897         return_VALUE(0);
1898 }
1899
1900 static void __exit acpi_video_exit(void)
1901 {
1902         ACPI_FUNCTION_TRACE("acpi_video_exit");
1903
1904         acpi_bus_unregister_driver(&acpi_video_bus);
1905
1906         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1907
1908         return_VOID;
1909 }
1910
1911 module_init(acpi_video_init);
1912 module_exit(acpi_video_exit);