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