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
  57 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  58 #define ACPI_VIDEO_HEAD_END             (~0u)
  59
  60
  61 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  62 ACPI_MODULE_NAME                ("acpi_video")
  63
  64 MODULE_AUTHOR("Bruno Ducrot");
  65 MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
  66 MODULE_LICENSE("GPL");
  67
  68 static int acpi_video_bus_add (struct acpi_device *device);
  69 static int acpi_video_bus_remove (struct acpi_device *device, int type);
  70 static int acpi_video_bus_match (struct acpi_device *device, struct acpi_driver *driver);
  71
  72 static struct acpi_driver acpi_video_bus = {
  73         .name = ACPI_VIDEO_DRIVER_NAME,
  74         .class = ACPI_VIDEO_CLASS,
  75         .ops = {
  76                 .add = acpi_video_bus_add,
  77                 .remove = acpi_video_bus_remove,
  78                 .match = acpi_video_bus_match,
  79         },
  80 };
  81
  82 struct acpi_video_bus_flags {
  83         u8      multihead:1;    /* can switch video heads */
  84         u8      rom:1;          /* can retrieve a video rom */
  85         u8      post:1;         /* can configure the head to */
  86         u8      reserved:5;
  87 };
  88
  89 struct acpi_video_bus_cap {
  90         u8      _DOS:1; /*Enable/Disable output switching*/
  91         u8      _DOD:1; /*Enumerate all devices attached to display adapter*/
  92         u8      _ROM:1; /*Get ROM Data*/
  93         u8      _GPD:1; /*Get POST Device*/
  94         u8      _SPD:1; /*Set POST Device*/
  95         u8      _VPO:1; /*Video POST Options*/
  96         u8      reserved:2;
  97 };
  98
  99 struct acpi_video_device_attrib{
 100         u32     display_index:4; /* A zero-based instance of the Display*/
 101         u32     display_port_attachment:4; /*This field differenates displays type*/
 102         u32     display_type:4; /*Describe the specific type in use*/
 103         u32     vendor_specific:4; /*Chipset Vendor Specifi*/
 104         u32     bios_can_detect:1; /*BIOS can detect the device*/
 105         u32     depend_on_vga:1; /*Non-VGA output device whose power is related to
 106                                    the VGA device.*/
 107         u32     pipe_id:3; /*For VGA multiple-head devices.*/
 108         u32     reserved:10; /*Must be 0*/
 109         u32     device_id_scheme:1; /*Device ID Scheme*/
 110 };
 111
 112 struct acpi_video_enumerated_device {
 113         union {
 114                 u32 int_val;
 115                 struct acpi_video_device_attrib attrib;
 116         } value;
 117         struct acpi_video_device *bind_info;
 118 };
 119
 120 struct acpi_video_bus {
 121         acpi_handle     handle;
 122         u8      dos_setting;
 123         struct acpi_video_enumerated_device *attached_array;
 124         u8                      attached_count;
 125         struct acpi_video_bus_cap       cap;
 126         struct acpi_video_bus_flags flags;
 127         struct semaphore        sem;
 128         struct list_head        video_device_list;
 129         struct proc_dir_entry   *dir;
 130 };
 131
 132 struct acpi_video_device_flags {
 133         u8      crt:1;
 134         u8      lcd:1;
 135         u8      tvout:1;
 136         u8      bios:1;
 137         u8      unknown:1;
 138         u8      reserved:3;
 139 };
 140
 141 struct acpi_video_device_cap {
 142         u8      _ADR:1; /*Return the unique ID */
 143         u8      _BCL:1; /*Query list of brightness control levels supported*/
 144         u8      _BCM:1; /*Set the brightness level*/
 145         u8      _DDC:1; /*Return the EDID for this device*/
 146         u8      _DCS:1; /*Return status of output device*/
 147         u8      _DGS:1; /*Query graphics state*/
 148         u8      _DSS:1; /*Device state set*/
 149         u8      _reserved:1;
 150 };
 151
 152 struct acpi_video_device_brightness {
 153         int     curr;
 154         int     count;
 155         int     *levels;
 156 };
 157
 158 struct acpi_video_device {
 159         acpi_handle             handle;
 160         unsigned long           device_id;
 161         struct acpi_video_device_flags  flags;
 162         struct acpi_video_device_cap    cap;
 163         struct list_head        entry;
 164         struct acpi_video_bus   *video;
 165         struct acpi_device      *dev;
 166         struct acpi_video_device_brightness *brightness;
 167 };
 168
 169
 170 /* bus */
 171 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 172 static struct file_operations acpi_video_bus_info_fops = {
 173         .open           = acpi_video_bus_info_open_fs,
 174         .read           = seq_read,
 175         .llseek         = seq_lseek,
 176         .release        = single_release,
 177 };
 178
 179 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 180 static struct file_operations acpi_video_bus_ROM_fops = {
 181         .open           = acpi_video_bus_ROM_open_fs,
 182         .read           = seq_read,
 183         .llseek         = seq_lseek,
 184         .release        = single_release,
 185 };
 186
 187 static int acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file);
 188 static struct file_operations acpi_video_bus_POST_info_fops = {
 189         .open           = acpi_video_bus_POST_info_open_fs,
 190         .read           = seq_read,
 191         .llseek         = seq_lseek,
 192         .release        = single_release,
 193 };
 194
 195 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 196 static struct file_operations acpi_video_bus_POST_fops = {
 197         .open           = acpi_video_bus_POST_open_fs,
 198         .read           = seq_read,
 199         .llseek         = seq_lseek,
 200         .release        = single_release,
 201 };
 202
 203
 204 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 205 static struct file_operations acpi_video_bus_DOS_fops = {
 206         .open           = acpi_video_bus_DOS_open_fs,
 207         .read           = seq_read,
 208         .llseek         = seq_lseek,
 209         .release        = single_release,
 210 };
 211
 212 /* device */
 213 static int acpi_video_device_info_open_fs(struct inode *inode, struct file *file);
 214 static struct file_operations acpi_video_device_info_fops = {
 215         .open           = acpi_video_device_info_open_fs,
 216         .read           = seq_read,
 217         .llseek         = seq_lseek,
 218         .release        = single_release,
 219 };
 220
 221 static int acpi_video_device_state_open_fs(struct inode *inode, 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, struct file *file);
 230 static struct file_operations acpi_video_device_brightness_fops = {
 231         .open           = acpi_video_device_brightness_open_fs,
 232         .read           = seq_read,
 233         .llseek         = seq_lseek,
 234         .release        = single_release,
 235 };
 236
 237 static int acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file);
 238 static struct file_operations acpi_video_device_EDID_fops = {
 239         .open           = acpi_video_device_EDID_open_fs,
 240         .read           = seq_read,
 241         .llseek         = seq_lseek,
 242         .release        = single_release,
 243 };
 244
 245 static char     device_decode[][30] = {
 246         "motherboard VGA device",
 247         "PCI VGA device",
 248         "AGP VGA device",
 249         "UNKNOWN",
 250 };
 251
 252 static void acpi_video_device_notify ( acpi_handle handle, u32 event, void *data);
 253 static void acpi_video_device_rebind( struct acpi_video_bus *video);
 254 static void acpi_video_device_bind( struct acpi_video_bus *video, struct acpi_video_device *device);
 255 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 256 static int acpi_video_switch_output( struct acpi_video_bus *video, int  event);
 257 static int acpi_video_get_next_level( struct acpi_video_device *device, u32 level_current,u32 event);
 258 static void acpi_video_switch_brightness ( struct acpi_video_device *device, int event);
 259
 260
 261 /* --------------------------------------------------------------------------
 262                                Video Management
 263    -------------------------------------------------------------------------- */
 264
 265 /* device */
 266
 267 static int
 268 acpi_video_device_query (
 269         struct acpi_video_device        *device,
 270         unsigned long                   *state)
 271 {
 272         int                     status;
 273         ACPI_FUNCTION_TRACE("acpi_video_device_query");
 274         status = acpi_evaluate_integer(device->handle, "_DGS", NULL, state);
 275
 276         return_VALUE(status);
 277 }
 278
 279 static int
 280 acpi_video_device_get_state (
 281         struct acpi_video_device        *device,
 282         unsigned long           *state)
 283 {
 284         int                     status;
 285
 286         ACPI_FUNCTION_TRACE("acpi_video_device_get_state");
 287
 288         status = acpi_evaluate_integer(device->handle, "_DCS", NULL, state);
 289
 290         return_VALUE(status);
 291 }
 292
 293 static int
 294 acpi_video_device_set_state (
 295         struct acpi_video_device        *device,
 296         int                     state)
 297 {
 298         int                     status;
 299         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 300         struct acpi_object_list args = {1, &arg0};
 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, NULL);
 306
 307         return_VALUE(status);
 308 }
 309
 310 static int
 311 acpi_video_device_lcd_query_levels (
 312         struct acpi_video_device        *device,
 313         union acpi_object               **levels)
 314 {
 315         int                     status;
 316         struct acpi_buffer      buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 317         union acpi_object       *obj;
 318
 319
 320         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_query_levels");
 321
 322         *levels = NULL;
 323
 324         status = acpi_evaluate_object(device->handle, "_BCL", NULL, &buffer);
 325         if (!ACPI_SUCCESS(status))
 326                 return_VALUE(status);
 327         obj = (union acpi_object *) buffer.pointer;
 328         if (!obj && (obj->type != ACPI_TYPE_PACKAGE)) {
 329                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _BCL data\n"));
 330                 status = -EFAULT;
 331                 goto err;
 332         }
 333
 334         *levels = obj;
 335
 336         return_VALUE(0);
 337
 338 err:
 339         if (buffer.pointer)
 340                 kfree(buffer.pointer);
 341
 342         return_VALUE(status);
 343 }
 344
 345 static int
 346 acpi_video_device_lcd_set_level (
 347         struct acpi_video_device        *device,
 348         int                             level)
 349 {
 350         int                     status;
 351         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 352         struct acpi_object_list args = {1, &arg0};
 353
 354         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_set_level");
 355
 356         arg0.integer.value = level;
 357         status = acpi_evaluate_object(device->handle, "_BCM", &args, NULL);
 358
 359         printk(KERN_DEBUG "set_level status: %x\n", status);
 360         return_VALUE(status);
 361 }
 362
 363 static int
 364 acpi_video_device_lcd_get_level_current (
 365         struct acpi_video_device        *device,
 366         unsigned long   *level)
 367 {
 368         int                     status;
 369         ACPI_FUNCTION_TRACE("acpi_video_device_lcd_get_level_current");
 370
 371         status = acpi_evaluate_integer(device->handle, "_BQC", NULL, level);
 372
 373         return_VALUE(status);
 374 }
 375
 376 static int
 377 acpi_video_device_EDID (
 378         struct acpi_video_device        *device,
 379         union acpi_object               **edid,
 380         ssize_t                         length)
 381 {
 382         int                     status;
 383         struct acpi_buffer      buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 384         union acpi_object       *obj;
 385         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 386         struct acpi_object_list args = {1, &arg0};
 387
 388         ACPI_FUNCTION_TRACE("acpi_video_device_get_EDID");
 389
 390         *edid = NULL;
 391
 392         if (!device)
 393                 return_VALUE(-ENODEV);
 394         if (length == 128)
 395                 arg0.integer.value = 1;
 396         else if (length == 256)
 397                 arg0.integer.value = 2;
 398         else
 399                 return_VALUE(-EINVAL);
 400
 401         status = acpi_evaluate_object(device->handle, "_DDC", &args, &buffer);
 402         if (ACPI_FAILURE(status))
 403                 return_VALUE(-ENODEV);
 404
 405         obj = (union acpi_object *) buffer.pointer;
 406
 407         if (obj && obj->type == ACPI_TYPE_BUFFER)
 408                 *edid = obj;
 409         else {
 410                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DDC data\n"));
 411                 status = -EFAULT;
 412                 kfree(obj);
 413         }
 414
 415         return_VALUE(status);
 416 }
 417
 418
 419 /* bus */
 420
 421 static int
 422 acpi_video_bus_set_POST (
 423         struct acpi_video_bus   *video,
 424         unsigned long           option)
 425 {
 426         int                     status;
 427         unsigned long           tmp;
 428         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 429         struct acpi_object_list args = {1, &arg0};
 430
 431         ACPI_FUNCTION_TRACE("acpi_video_bus_set_POST");
 432
 433         arg0.integer.value = option;
 434
 435         status = acpi_evaluate_integer(video->handle, "_SPD", &args, &tmp);
 436         if (ACPI_SUCCESS(status))
 437                 status = tmp ? (-EINVAL):(AE_OK);
 438
 439         return_VALUE(status);
 440 }
 441
 442 static int
 443 acpi_video_bus_get_POST (
 444         struct acpi_video_bus   *video,
 445         unsigned long           *id)
 446 {
 447         int status;
 448
 449         ACPI_FUNCTION_TRACE("acpi_video_bus_get_POST");
 450
 451         status = acpi_evaluate_integer(video->handle, "_GPD", NULL, id);
 452
 453         return_VALUE(status);
 454 }
 455
 456 static int
 457 acpi_video_bus_POST_options (
 458         struct acpi_video_bus   *video,
 459         unsigned long           *options)
 460 {
 461         int                     status;
 462         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_options");
 463
 464         status = acpi_evaluate_integer(video->handle, "_VPO", NULL, options);
 465         *options &= 3;
 466
 467         return_VALUE(status);
 468 }
 469
 470 /*
 471  *  Arg:
 472  *      video           : video bus device pointer
 473  *      bios_flag       :
 474  *              0.      The system BIOS should NOT automatically switch(toggle)
 475  *                      the active display output.
 476  *              1.      The system BIOS should automatically switch (toggle) the
 477  *                      active display output. No swich event.
 478  *              2.      The _DGS value should be locked.
 479  *              3.      The system BIOS should not automatically switch (toggle) the
 480  *                      active display output, but instead generate the display switch
 481  *                      event notify code.
 482  *      lcd_flag        :
 483  *              0.      The system BIOS should automatically control the brightness level
 484  *                      of the LCD, when the power changes from AC to DC
 485  *              1.      The system BIOS should NOT automatically control the brightness
 486  *                      level of the LCD, when the power changes from AC to DC.
 487  * Return Value:
 488  *              -1      wrong arg.
 489  */
 490
 491 static int
 492 acpi_video_bus_DOS(
 493         struct acpi_video_bus   *video,
 494         int                     bios_flag,
 495         int                     lcd_flag)
 496 {
 497         acpi_integer            status = 0;
 498         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 499         struct acpi_object_list args = {1, &arg0};
 500
 501         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS");
 502
 503         if (bios_flag < 0 || bios_flag >3 || lcd_flag < 0 || lcd_flag > 1){
 504                 status = -1;
 505                 goto Failed;
 506         }
 507         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 508         video->dos_setting = arg0.integer.value;
 509         acpi_evaluate_object(video->handle, "_DOS", &args, NULL);
 510
 511 Failed:
 512         return_VALUE(status);
 513 }
 514
 515 /*
 516  *  Arg:
 517  *      device  : video output device (LCD, CRT, ..)
 518  *
 519  *  Return Value:
 520  *      None
 521  *
 522  *  Find out all required AML method defined under the output
 523  *  device.
 524  */
 525
 526 static void
 527 acpi_video_device_find_cap (struct acpi_video_device *device)
 528 {
 529         acpi_integer            status;
 530         acpi_handle h_dummy1;
 531         int i;
 532         union acpi_object *obj = NULL;
 533         struct acpi_video_device_brightness *br = NULL;
 534
 535         ACPI_FUNCTION_TRACE("acpi_video_device_find_cap");
 536
 537         memset( &device->cap, 0, 4);
 538
 539         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_ADR", &h_dummy1))) {
 540                 device->cap._ADR = 1;
 541         }
 542         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCL", &h_dummy1))) {
 543                 device->cap._BCL= 1;
 544         }
 545         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCM", &h_dummy1))) {
 546                 device->cap._BCM= 1;
 547         }
 548         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_DDC", &h_dummy1))) {
 549                 device->cap._DDC= 1;
 550         }
 551         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_DCS", &h_dummy1))) {
 552                 device->cap._DCS = 1;
 553         }
 554         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_DGS", &h_dummy1))) {
 555                 device->cap._DGS = 1;
 556         }
 557         if( ACPI_SUCCESS(acpi_get_handle(device->handle, "_DSS", &h_dummy1))) {
 558                 device->cap._DSS = 1;
 559         }
 560
 561         status = acpi_video_device_lcd_query_levels(device, &obj);
 562
 563         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 564                 int count = 0;
 565                 union acpi_object *o;
 566
 567                 br = kmalloc(sizeof &br, GFP_KERNEL);
 568                 if (!br) {
 569                         printk(KERN_ERR "can't allocate memory\n");
 570                 } else {
 571                         memset(br, 0, sizeof &br);
 572                         br->levels = kmalloc(obj->package.count * sizeof &br->levels, GFP_KERNEL);
 573                         if (!br->levels)
 574                                 goto out;
 575
 576                         for (i = 0; i < obj->package.count; i++) {
 577                                 o = (union acpi_object *) &obj->package.elements[i];
 578                                 if (o->type != ACPI_TYPE_INTEGER) {
 579                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 580                                         continue;
 581                                 }
 582                                 br->levels[count] = (u32) o->integer.value;
 583                                 count++;
 584                         }
 585 out:
 586                         if (count < 2) {
 587                                 if (br->levels)
 588                                         kfree(br->levels);
 589                                 kfree(br);
 590                         } else {
 591                                 br->count = count;
 592                                 device->brightness = br;
 593                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 594                         }
 595                 }
 596         }
 597
 598         if (obj)
 599                 kfree(obj);
 600
 601         return_VOID;
 602 }
 603
 604 /*
 605  *  Arg:
 606  *      device  : video output device (VGA)
 607  *
 608  *  Return Value:
 609  *      None
 610  *
 611  *  Find out all required AML method defined under the video bus device.
 612  */
 613
 614 static void
 615 acpi_video_bus_find_cap (struct acpi_video_bus *video)
 616 {
 617         acpi_handle     h_dummy1;
 618
 619         memset(&video->cap ,0, 4);
 620         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOS", &h_dummy1))) {
 621                 video->cap._DOS = 1;
 622         }
 623         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOD", &h_dummy1))) {
 624                 video->cap._DOD = 1;
 625         }
 626         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_ROM", &h_dummy1))) {
 627                 video->cap._ROM = 1;
 628         }
 629         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_GPD", &h_dummy1))) {
 630                 video->cap._GPD = 1;
 631         }
 632         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_SPD", &h_dummy1))) {
 633                 video->cap._SPD = 1;
 634         }
 635         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_VPO", &h_dummy1))) {
 636                 video->cap._VPO = 1;
 637         }
 638 }
 639
 640 /*
 641  * Check whether the video bus device has required AML method to
 642  * support the desired features
 643  */
 644
 645 static int
 646 acpi_video_bus_check (
 647         struct acpi_video_bus   *video)
 648 {
 649         acpi_status             status = -ENOENT;
 650
 651
 652         ACPI_FUNCTION_TRACE("acpi_video_bus_check");
 653
 654         if (!video)
 655                 return_VALUE(-EINVAL);
 656
 657         /* Since there is no HID, CID and so on for VGA driver, we have
 658          * to check well known required nodes.
 659          */
 660
 661         /* Does this device able to support video switching ? */
 662         if(video->cap._DOS){
 663                 video->flags.multihead = 1;
 664                 status = 0;
 665         }
 666
 667         /* Does this device able to retrieve a retrieve a video ROM ? */
 668         if(video->cap._ROM){
 669                 video->flags.rom = 1;
 670                 status = 0;
 671         }
 672
 673         /* Does this device able to configure which video device to POST ? */
 674         if(video->cap._GPD && video->cap._SPD && video->cap._VPO){
 675                 video->flags.post = 1;
 676                 status = 0;
 677         }
 678
 679         return_VALUE(status);
 680 }
 681
 682 /* --------------------------------------------------------------------------
 683                               FS Interface (/proc)
 684    -------------------------------------------------------------------------- */
 685
 686 static struct proc_dir_entry    *acpi_video_dir;
 687
 688 /* video devices */
 689
 690 static int
 691 acpi_video_device_info_seq_show (
 692         struct seq_file         *seq,
 693         void                    *offset)
 694 {
 695         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 696
 697         ACPI_FUNCTION_TRACE("acpi_video_device_info_seq_show");
 698
 699         if (!dev)
 700                 goto end;
 701
 702         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 703         seq_printf(seq, "type:         ");
 704         if (dev->flags.crt)
 705                 seq_printf(seq, "CRT\n");
 706         else if (dev->flags.lcd)
 707                 seq_printf(seq, "LCD\n");
 708         else if (dev->flags.tvout)
 709                 seq_printf(seq, "TVOUT\n");
 710         else
 711                 seq_printf(seq, "UNKNOWN\n");
 712
 713         seq_printf(seq,"known by bios: %s\n",
 714                    dev->flags.bios ? "yes":"no");
 715
 716 end:
 717         return_VALUE(0);
 718 }
 719
 720 static int
 721 acpi_video_device_info_open_fs (
 722         struct inode            *inode,
 723         struct file             *file)
 724 {
 725         return single_open(file, acpi_video_device_info_seq_show,
 726                            PDE(inode)->data);
 727 }
 728
 729 static int
 730 acpi_video_device_state_seq_show (
 731         struct seq_file         *seq,
 732         void                    *offset)
 733 {
 734         int                     status;
 735         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 736         unsigned long   state;
 737
 738         ACPI_FUNCTION_TRACE("acpi_video_device_state_seq_show");
 739
 740         if (!dev)
 741                 goto end;
 742
 743         status = acpi_video_device_get_state(dev, &state);
 744         seq_printf(seq, "state:     ");
 745         if (ACPI_SUCCESS(status))
 746                 seq_printf(seq, "0x%02lx\n", state);
 747         else
 748                 seq_printf(seq, "<not supported>\n");
 749
 750         status = acpi_video_device_query(dev, &state);
 751         seq_printf(seq, "query:     ");
 752         if (ACPI_SUCCESS(status))
 753                 seq_printf(seq, "0x%02lx\n", state);
 754         else
 755                 seq_printf(seq, "<not supported>\n");
 756
 757 end:
 758         return_VALUE(0);
 759 }
 760
 761 static int
 762 acpi_video_device_state_open_fs (
 763         struct inode            *inode,
 764         struct file             *file)
 765 {
 766         return single_open(file, acpi_video_device_state_seq_show,
 767                            PDE(inode)->data);
 768 }
 769
 770 static ssize_t
 771 acpi_video_device_write_state (
 772         struct file             *file,
 773         const char              __user *buffer,
 774         size_t                  count,
 775         loff_t                  *data)
 776 {
 777         int                     status;
 778         struct seq_file         *m = (struct seq_file *) file->private_data;
 779         struct acpi_video_device        *dev = (struct acpi_video_device *) m->private;
 780         char                    str[12] = {0};
 781         u32                     state = 0;
 782
 783         ACPI_FUNCTION_TRACE("acpi_video_device_write_state");
 784
 785         if (!dev || count + 1 > sizeof str)
 786                 return_VALUE(-EINVAL);
 787
 788         if (copy_from_user(str, buffer, count))
 789                 return_VALUE(-EFAULT);
 790
 791         str[count] = 0;
 792         state = simple_strtoul(str, NULL, 0);
 793         state &= ((1ul<<31) | (1ul<<30) | (1ul<<0));
 794
 795         status = acpi_video_device_set_state(dev, state);
 796
 797         if (status)
 798                 return_VALUE(-EFAULT);
 799
 800         return_VALUE(count);
 801 }
 802
 803 static int
 804 acpi_video_device_brightness_seq_show (
 805         struct seq_file         *seq,
 806         void                    *offset)
 807 {
 808         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 809         int                     i;
 810
 811         ACPI_FUNCTION_TRACE("acpi_video_device_brightness_seq_show");
 812
 813         if (!dev || !dev->brightness) {
 814                 seq_printf(seq, "<not supported>\n");
 815                 return_VALUE(0);
 816         }
 817
 818         seq_printf(seq, "levels: ");
 819         for (i = 0; i < dev->brightness->count; i++)
 820                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 821         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 822
 823         return_VALUE(0);
 824 }
 825
 826 static int
 827 acpi_video_device_brightness_open_fs (
 828         struct inode            *inode,
 829         struct file             *file)
 830 {
 831         return single_open(file, acpi_video_device_brightness_seq_show,
 832                            PDE(inode)->data);
 833 }
 834
 835 static ssize_t
 836 acpi_video_device_write_brightness (
 837         struct file             *file,
 838         const char              __user *buffer,
 839         size_t                  count,
 840         loff_t                  *data)
 841 {
 842         struct seq_file         *m = (struct seq_file *) file->private_data;
 843         struct acpi_video_device        *dev = (struct acpi_video_device *) m->private;
 844         char                    str[4] = {0};
 845         unsigned int            level = 0;
 846         int                     i;
 847
 848         ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 849
 850         if (!dev || count + 1 > sizeof str)
 851                 return_VALUE(-EINVAL);
 852
 853         if (copy_from_user(str, buffer, count))
 854                 return_VALUE(-EFAULT);
 855
 856         str[count] = 0;
 857         level = simple_strtoul(str, NULL, 0);
 858
 859         if (level > 100)
 860                 return_VALUE(-EFAULT);
 861
 862         /* validate though the list of available levels */
 863         for (i = 0; i < dev->brightness->count; i++)
 864                 if (level == dev->brightness->levels[i]) {
 865                         if (ACPI_SUCCESS(acpi_video_device_lcd_set_level(dev, level)))
 866                                 dev->brightness->curr = level;
 867                         break;
 868                 }
 869
 870         return_VALUE(count);
 871 }
 872
 873 static int
 874 acpi_video_device_EDID_seq_show (
 875         struct seq_file         *seq,
 876         void                    *offset)
 877 {
 878         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 879         int                     status;
 880         int                     i;
 881         union acpi_object       *edid = NULL;
 882
 883         ACPI_FUNCTION_TRACE("acpi_video_device_EDID_seq_show");
 884
 885         if (!dev)
 886                 goto out;
 887
 888         status = acpi_video_device_EDID (dev, &edid, 128);
 889         if (ACPI_FAILURE(status)) {
 890                 status = acpi_video_device_EDID (dev, &edid, 256);
 891         }
 892
 893         if (ACPI_FAILURE(status)) {
 894                 goto out;
 895         }
 896
 897         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 898                 for (i = 0; i < edid->buffer.length; i++)
 899                         seq_putc(seq, edid->buffer.pointer[i]);
 900         }
 901
 902 out:
 903         if (!edid)
 904                 seq_printf(seq, "<not supported>\n");
 905         else
 906                 kfree(edid);
 907
 908         return_VALUE(0);
 909 }
 910
 911 static int
 912 acpi_video_device_EDID_open_fs (
 913         struct inode            *inode,
 914         struct file             *file)
 915 {
 916         return single_open(file, acpi_video_device_EDID_seq_show,
 917                            PDE(inode)->data);
 918 }
 919
 920
 921 static int
 922 acpi_video_device_add_fs (
 923         struct acpi_device      *device)
 924 {
 925         struct proc_dir_entry   *entry = NULL;
 926         struct acpi_video_device *vid_dev;
 927
 928         ACPI_FUNCTION_TRACE("acpi_video_device_add_fs");
 929
 930         if (!device)
 931                 return_VALUE(-ENODEV);
 932
 933         vid_dev = (struct acpi_video_device *) acpi_driver_data(device);
 934         if (!vid_dev)
 935                 return_VALUE(-ENODEV);
 936
 937         if (!acpi_device_dir(device)) {
 938                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 939                                 vid_dev->video->dir);
 940                 if (!acpi_device_dir(device))
 941                         return_VALUE(-ENODEV);
 942                 acpi_device_dir(device)->owner = THIS_MODULE;
 943         }
 944
 945         /* 'info' [R] */
 946         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 947         if (!entry)
 948                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 949                         "Unable to create 'info' fs entry\n"));
 950         else {
 951                 entry->proc_fops = &acpi_video_device_info_fops;
 952                 entry->data = acpi_driver_data(device);
 953                 entry->owner = THIS_MODULE;
 954         }
 955
 956         /* 'state' [R/W] */
 957         entry = create_proc_entry("state", S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 958         if (!entry)
 959                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 960                         "Unable to create 'state' fs entry\n"));
 961         else {
 962                 entry->proc_fops = &acpi_video_device_state_fops;
 963                 entry->proc_fops->write = acpi_video_device_write_state;
 964                 entry->data = acpi_driver_data(device);
 965                 entry->owner = THIS_MODULE;
 966         }
 967
 968         /* 'brightness' [R/W] */
 969         entry = create_proc_entry("brightness", S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 970         if (!entry)
 971                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 972                         "Unable to create 'brightness' fs entry\n"));
 973         else {
 974                 entry->proc_fops = &acpi_video_device_brightness_fops;
 975                 entry->proc_fops->write = acpi_video_device_write_brightness;
 976                 entry->data = acpi_driver_data(device);
 977                 entry->owner = THIS_MODULE;
 978         }
 979
 980         /* 'EDID' [R] */
 981         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 982         if (!entry)
 983                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 984                         "Unable to create 'brightness' fs entry\n"));
 985         else {
 986                 entry->proc_fops = &acpi_video_device_EDID_fops;
 987                 entry->data = acpi_driver_data(device);
 988                 entry->owner = THIS_MODULE;
 989         }
 990
 991         return_VALUE(0);
 992 }
 993
 994 static int
 995 acpi_video_device_remove_fs (
 996         struct acpi_device      *device)
 997 {
 998         struct acpi_video_device *vid_dev;
 999         ACPI_FUNCTION_TRACE("acpi_video_device_remove_fs");
1000
1001         vid_dev = (struct acpi_video_device *) acpi_driver_data(device);
1002         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1003                 return_VALUE(-ENODEV);
1004
1005         if (acpi_device_dir(device)) {
1006                 remove_proc_entry("info", acpi_device_dir(device));
1007                 remove_proc_entry("state", acpi_device_dir(device));
1008                 remove_proc_entry("brightness", acpi_device_dir(device));
1009                 remove_proc_entry("EDID", acpi_device_dir(device));
1010                 remove_proc_entry(acpi_device_bid(device),
1011                                  vid_dev->video->dir);
1012                 acpi_device_dir(device) = NULL;
1013         }
1014
1015         return_VALUE(0);
1016 }
1017
1018
1019 /* video bus */
1020 static int
1021 acpi_video_bus_info_seq_show (
1022         struct seq_file         *seq,
1023         void                    *offset)
1024 {
1025         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1026
1027         ACPI_FUNCTION_TRACE("acpi_video_bus_info_seq_show");
1028
1029         if (!video)
1030                 goto end;
1031
1032         seq_printf(seq, "Switching heads:              %s\n",
1033                         video->flags.multihead ? "yes":"no");
1034         seq_printf(seq, "Video ROM:                    %s\n",
1035                         video->flags.rom ? "yes":"no");
1036         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1037                         video->flags.post ? "yes":"no");
1038
1039 end:
1040         return_VALUE(0);
1041 }
1042
1043 static int
1044 acpi_video_bus_info_open_fs (
1045         struct inode            *inode,
1046         struct file             *file)
1047 {
1048         return single_open(file, acpi_video_bus_info_seq_show, PDE(inode)->data);
1049 }
1050
1051 static int
1052 acpi_video_bus_ROM_seq_show (
1053         struct seq_file         *seq,
1054         void                    *offset)
1055 {
1056         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1057
1058         ACPI_FUNCTION_TRACE("acpi_video_bus_ROM_seq_show");
1059
1060         if (!video)
1061                 goto end;
1062
1063         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1064         seq_printf(seq, "<TODO>\n");
1065
1066 end:
1067         return_VALUE(0);
1068 }
1069
1070 static int
1071 acpi_video_bus_ROM_open_fs (
1072         struct inode            *inode,
1073         struct file             *file)
1074 {
1075         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1076 }
1077
1078 static int
1079 acpi_video_bus_POST_info_seq_show (
1080         struct seq_file         *seq,
1081         void                    *offset)
1082 {
1083         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1084         unsigned long           options;
1085         int                     status;
1086
1087         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_info_seq_show");
1088
1089         if (!video)
1090                 goto end;
1091
1092         status = acpi_video_bus_POST_options(video, &options);
1093         if (ACPI_SUCCESS(status)) {
1094                 if (!(options & 1)) {
1095                         printk(KERN_WARNING PREFIX "The motherboard VGA device is not listed as a possible POST device.\n");
1096                         printk(KERN_WARNING PREFIX "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1097                 }
1098                 printk("%lx\n", options);
1099                 seq_printf(seq, "can POST: <intgrated video>");
1100                 if (options & 2)
1101                         seq_printf(seq, " <PCI video>");
1102                 if (options & 4)
1103                         seq_printf(seq, " <AGP video>");
1104                 seq_putc(seq, '\n');
1105         } else
1106                 seq_printf(seq, "<not supported>\n");
1107 end:
1108         return_VALUE(0);
1109 }
1110
1111 static int
1112 acpi_video_bus_POST_info_open_fs (
1113         struct inode            *inode,
1114         struct file             *file)
1115 {
1116         return single_open(file, acpi_video_bus_POST_info_seq_show, PDE(inode)->data);
1117 }
1118
1119 static int
1120 acpi_video_bus_POST_seq_show (
1121         struct seq_file         *seq,
1122         void                    *offset)
1123 {
1124         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1125         int                     status;
1126         unsigned long           id;
1127
1128         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_seq_show");
1129
1130         if (!video)
1131                 goto end;
1132
1133         status = acpi_video_bus_get_POST (video, &id);
1134         if (!ACPI_SUCCESS(status)) {
1135                 seq_printf(seq, "<not supported>\n");
1136                 goto end;
1137         }
1138         seq_printf(seq, "device posted is <%s>\n",  device_decode[id & 3]);
1139
1140 end:
1141         return_VALUE(0);
1142 }
1143
1144 static int
1145 acpi_video_bus_DOS_seq_show (
1146         struct seq_file         *seq,
1147         void                    *offset)
1148 {
1149         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1150
1151         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS_seq_show");
1152
1153         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting );
1154
1155         return_VALUE(0);
1156 }
1157
1158 static int
1159 acpi_video_bus_POST_open_fs (
1160         struct inode            *inode,
1161         struct file             *file)
1162 {
1163         return single_open(file, acpi_video_bus_POST_seq_show, PDE(inode)->data);
1164 }
1165
1166 static int
1167 acpi_video_bus_DOS_open_fs (
1168         struct inode            *inode,
1169         struct file             *file)
1170 {
1171         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1172 }
1173
1174 static ssize_t
1175 acpi_video_bus_write_POST (
1176         struct file             *file,
1177         const char              __user *buffer,
1178         size_t                  count,
1179         loff_t                  *data)
1180 {
1181         int                     status;
1182         struct seq_file         *m = (struct seq_file *) file->private_data;
1183         struct acpi_video_bus   *video = (struct acpi_video_bus *) m->private;
1184         char                    str[12] = {0};
1185         unsigned long           opt, options;
1186
1187         ACPI_FUNCTION_TRACE("acpi_video_bus_write_POST");
1188
1189
1190         if (!video || count + 1 > sizeof str)
1191                 return_VALUE(-EINVAL);
1192
1193         status = acpi_video_bus_POST_options(video, &options);
1194         if (!ACPI_SUCCESS(status))
1195                 return_VALUE(-EINVAL);
1196
1197         if (copy_from_user(str, buffer, count))
1198                 return_VALUE(-EFAULT);
1199
1200         str[count] = 0;
1201         opt = strtoul(str, NULL, 0);
1202         if (opt > 3)
1203                 return_VALUE(-EFAULT);
1204
1205         /* just in case an OEM 'forget' the motherboard... */
1206         options |= 1;
1207
1208         if (options & (1ul << opt)) {
1209                 status = acpi_video_bus_set_POST (video, opt);
1210                 if (!ACPI_SUCCESS(status))
1211                         return_VALUE(-EFAULT);
1212
1213         }
1214
1215
1216         return_VALUE(count);
1217 }
1218
1219 static ssize_t
1220 acpi_video_bus_write_DOS (
1221         struct file             *file,
1222         const char              __user *buffer,
1223         size_t                  count,
1224         loff_t                  *data)
1225 {
1226         int                     status;
1227         struct seq_file         *m = (struct seq_file *) file->private_data;
1228         struct acpi_video_bus   *video = (struct acpi_video_bus *) m->private;
1229         char                    str[12] = {0};
1230         unsigned long           opt;
1231
1232         ACPI_FUNCTION_TRACE("acpi_video_bus_write_DOS");
1233
1234
1235         if (!video || count + 1 > sizeof str)
1236                 return_VALUE(-EINVAL);
1237
1238         if (copy_from_user(str, buffer, count))
1239                 return_VALUE(-EFAULT);
1240
1241         str[count] = 0;
1242         opt = strtoul(str, NULL, 0);
1243         if (opt > 7)
1244                 return_VALUE(-EFAULT);
1245
1246         status = acpi_video_bus_DOS (video, opt & 0x3, (opt & 0x4)>>2);
1247
1248         if (!ACPI_SUCCESS(status))
1249                 return_VALUE(-EFAULT);
1250
1251         return_VALUE(count);
1252 }
1253
1254 static int
1255 acpi_video_bus_add_fs (
1256         struct acpi_device      *device)
1257 {
1258         struct proc_dir_entry   *entry = NULL;
1259         struct acpi_video_bus   *video;
1260
1261         ACPI_FUNCTION_TRACE("acpi_video_bus_add_fs");
1262
1263         video = (struct acpi_video_bus *) acpi_driver_data(device);
1264
1265         if (!acpi_device_dir(device)) {
1266                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1267                                 acpi_video_dir);
1268                 if (!acpi_device_dir(device))
1269                         return_VALUE(-ENODEV);
1270                 video->dir = acpi_device_dir(device);
1271                 acpi_device_dir(device)->owner = THIS_MODULE;
1272         }
1273
1274         /* 'info' [R] */
1275         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1276         if (!entry)
1277                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'info' fs entry\n"));
1278         else {
1279                 entry->proc_fops = &acpi_video_bus_info_fops;
1280                 entry->data = acpi_driver_data(device);
1281                 entry->owner = THIS_MODULE;
1282         }
1283
1284         /* 'ROM' [R] */
1285         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1286         if (!entry)
1287                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'ROM' fs entry\n"));
1288         else {
1289                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1290                 entry->data = acpi_driver_data(device);
1291                 entry->owner = THIS_MODULE;
1292         }
1293
1294         /* 'POST_info' [R] */
1295         entry = create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1296         if (!entry)
1297                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'POST_info' fs entry\n"));
1298         else {
1299                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1300                 entry->data = acpi_driver_data(device);
1301                 entry->owner = THIS_MODULE;
1302         }
1303
1304         /* 'POST' [R/W] */
1305         entry = create_proc_entry("POST", S_IFREG|S_IRUGO|S_IRUSR, acpi_device_dir(device));
1306         if (!entry)
1307                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'POST' fs entry\n"));
1308         else {
1309                 entry->proc_fops = &acpi_video_bus_POST_fops;
1310                 entry->proc_fops->write = acpi_video_bus_write_POST;
1311                 entry->data = acpi_driver_data(device);
1312                 entry->owner = THIS_MODULE;
1313         }
1314
1315         /* 'DOS' [R/W] */
1316         entry = create_proc_entry("DOS", S_IFREG|S_IRUGO|S_IRUSR, acpi_device_dir(device));
1317         if (!entry)
1318                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'DOS' fs entry\n"));
1319         else {
1320                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1321                 entry->proc_fops->write = acpi_video_bus_write_DOS;
1322                 entry->data = acpi_driver_data(device);
1323                 entry->owner = THIS_MODULE;
1324         }
1325
1326         return_VALUE(0);
1327 }
1328
1329 static int
1330 acpi_video_bus_remove_fs (
1331         struct acpi_device      *device)
1332 {
1333         struct acpi_video_bus   *video;
1334
1335         ACPI_FUNCTION_TRACE("acpi_video_bus_remove_fs");
1336
1337         video = (struct acpi_video_bus *) acpi_driver_data(device);
1338
1339         if (acpi_device_dir(device)) {
1340                 remove_proc_entry("info", acpi_device_dir(device));
1341                 remove_proc_entry("ROM", acpi_device_dir(device));
1342                 remove_proc_entry("POST_info", acpi_device_dir(device));
1343                 remove_proc_entry("POST", acpi_device_dir(device));
1344                 remove_proc_entry("DOS", acpi_device_dir(device));
1345                 remove_proc_entry(acpi_device_bid(device),
1346                                 acpi_video_dir);
1347                 acpi_device_dir(device) = NULL;
1348         }
1349
1350         return_VALUE(0);
1351 }
1352
1353 /* --------------------------------------------------------------------------
1354                                  Driver Interface
1355    -------------------------------------------------------------------------- */
1356
1357 /* device interface */
1358
1359 static int
1360 acpi_video_bus_get_one_device (
1361         struct acpi_device      *device,
1362         struct acpi_video_bus   *video)
1363 {
1364         unsigned long           device_id;
1365         int                     status, result;
1366         struct acpi_video_device        *data;
1367
1368         ACPI_FUNCTION_TRACE("acpi_video_bus_get_one_device");
1369
1370         if (!device || !video)
1371                 return_VALUE(-EINVAL);
1372
1373         status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1374         if (ACPI_SUCCESS(status)) {
1375
1376                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1377                 if (!data)
1378                         return_VALUE(-ENOMEM);
1379
1380                 memset(data, 0, sizeof(struct acpi_video_device));
1381
1382                 data->handle = device->handle;
1383                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1384                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1385                 acpi_driver_data(device) = data;
1386
1387                 data->device_id = device_id;
1388                 data->video = video;
1389                 data->dev = device;
1390
1391                 switch (device_id & 0xffff) {
1392                 case 0x0100:
1393                         data->flags.crt = 1;
1394                         break;
1395                 case 0x0400:
1396                         data->flags.lcd = 1;
1397                         break;
1398                 case 0x0200:
1399                         data->flags.tvout = 1;
1400                         break;
1401                 default:
1402                         data->flags.unknown = 1;
1403                         break;
1404                 }
1405
1406                 acpi_video_device_bind(video, data);
1407                 acpi_video_device_find_cap(data);
1408
1409                 status = acpi_install_notify_handler(data->handle,
1410                         ACPI_DEVICE_NOTIFY, acpi_video_device_notify, data);
1411                 if (ACPI_FAILURE(status)) {
1412                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1413                                 "Error installing notify handler\n"));
1414                         result = -ENODEV;
1415                         goto end;
1416                 }
1417
1418                 down(&video->sem);
1419                 list_add_tail(&data->entry, &video->video_device_list);
1420                 up(&video->sem);
1421
1422                 acpi_video_device_add_fs(device);
1423
1424                 return_VALUE(0);
1425         }
1426
1427 end:
1428         return_VALUE(-ENOENT);
1429 }
1430
1431 /*
1432  *  Arg:
1433  *      video   : video bus device
1434  *
1435  *  Return:
1436  *      none
1437  *
1438  *  Enumerate the video device list of the video bus,
1439  *  bind the ids with the corresponding video devices
1440  *  under the video bus.
1441  */
1442
1443 static void
1444 acpi_video_device_rebind( struct acpi_video_bus *video)
1445 {
1446         struct list_head * node, * next;
1447         list_for_each_safe(node, next, &video->video_device_list) {
1448                 struct acpi_video_device * dev = container_of(node, struct acpi_video_device, entry);
1449                 acpi_video_device_bind( video, dev);
1450         }
1451 }
1452
1453 /*
1454  *  Arg:
1455  *      video   : video bus device
1456  *      device  : video output device under the video
1457  *              bus
1458  *
1459  *  Return:
1460  *      none
1461  *
1462  *  Bind the ids with the corresponding video devices
1463  *  under the video bus.
1464  */
1465
1466 static void
1467 acpi_video_device_bind( struct acpi_video_bus *video,
1468                         struct acpi_video_device *device)
1469 {
1470         int     i;
1471         ACPI_FUNCTION_TRACE("acpi_video_device_bind");
1472
1473 #define IDS_VAL(i) video->attached_array[i].value.int_val
1474 #define IDS_BIND(i) video->attached_array[i].bind_info
1475
1476         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1477                 i < video->attached_count; i++) {
1478                 if (device->device_id == (IDS_VAL(i)& 0xffff)) {
1479                         IDS_BIND(i) = device;
1480                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1481                 }
1482         }
1483 #undef IDS_VAL
1484 #undef IDS_BIND
1485 }
1486
1487 /*
1488  *  Arg:
1489  *      video   : video bus device
1490  *
1491  *  Return:
1492  *      < 0     : error
1493  *
1494  *  Call _DOD to enumerate all devices attached to display adapter
1495  *
1496  */
1497
1498 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1499 {
1500         int                     status;
1501         int                     count;
1502         int                     i;
1503         struct acpi_video_enumerated_device *active_device_list;
1504         struct acpi_buffer      buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1505         union acpi_object       *dod = NULL;
1506         union acpi_object       *obj;
1507
1508         ACPI_FUNCTION_TRACE("acpi_video_device_enumerate");
1509
1510         status = acpi_evaluate_object(video->handle, "_DOD", NULL, &buffer);
1511         if (!ACPI_SUCCESS(status)) {
1512                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _DOD\n"));
1513                 return_VALUE(status);
1514         }
1515
1516         dod = (union acpi_object *) buffer.pointer;
1517         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1518                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1519                 status = -EFAULT;
1520                 goto out;
1521         }
1522
1523         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1524                 dod->package.count));
1525
1526         active_device_list= kmalloc(
1527                 (1+dod->package.count)*sizeof(struct acpi_video_enumerated_device),
1528                 GFP_KERNEL);
1529
1530         if (!active_device_list) {
1531                 status = -ENOMEM;
1532                 goto out;
1533         }
1534
1535         count = 0;
1536         for (i = 0; i < dod->package.count; i++) {
1537                 obj = (union acpi_object *) &dod->package.elements[i];
1538
1539                 if (obj->type != ACPI_TYPE_INTEGER) {
1540                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1541                         active_device_list[i].value.int_val = ACPI_VIDEO_HEAD_INVALID;
1542                 }
1543                 active_device_list[i].value.int_val = obj->integer.value;
1544                 active_device_list[i].bind_info = NULL;
1545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, (int) obj->integer.value));
1546                 count++;
1547         }
1548         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1549
1550         if(video->attached_array)
1551                 kfree(video->attached_array);
1552
1553         video->attached_array = active_device_list;
1554         video->attached_count = count;
1555 out:
1556         acpi_os_free(buffer.pointer);
1557         return_VALUE(status);
1558 }
1559
1560 /*
1561  *  Arg:
1562  *      video   : video bus device
1563  *      event   : Nontify Event
1564  *
1565  *  Return:
1566  *      < 0     : error
1567  *
1568  *      1. Find out the current active output device.
1569  *      2. Identify the next output device to switch
1570  *      3. call _DSS to do actual switch.
1571  */
1572
1573 static int
1574 acpi_video_switch_output(
1575         struct acpi_video_bus *video,
1576         int     event)
1577 {
1578         struct list_head * node, * next;
1579         struct acpi_video_device *dev=NULL;
1580         struct acpi_video_device *dev_next=NULL;
1581         struct acpi_video_device *dev_prev=NULL;
1582         unsigned long state;
1583         int status = 0;
1584
1585         ACPI_FUNCTION_TRACE("acpi_video_switch_output");
1586
1587         list_for_each_safe(node, next, &video->video_device_list) {
1588                 struct acpi_video_device * dev = container_of(node, struct acpi_video_device, entry);
1589                 status = acpi_video_device_get_state(dev, &state);
1590                 if (state & 0x2){
1591                         dev_next = container_of(node->next, struct acpi_video_device, entry);
1592                         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1593                         goto out;
1594                 }
1595         }
1596         dev_next = container_of(node->next, struct acpi_video_device, entry);
1597         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1598 out:
1599         switch (event) {
1600         case ACPI_VIDEO_NOTIFY_CYCLE:
1601         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1602                 acpi_video_device_set_state(dev, 0);
1603                 acpi_video_device_set_state(dev_next, 0x80000001);
1604                 break;
1605         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1606                 acpi_video_device_set_state(dev, 0);
1607                 acpi_video_device_set_state(dev_prev, 0x80000001);
1608         default:
1609                 break;
1610         }
1611
1612         return_VALUE(status);
1613 }
1614
1615 static int
1616 acpi_video_get_next_level(
1617         struct acpi_video_device *device,
1618         u32     level_current,
1619         u32     event)
1620 {
1621         /*Fix me*/
1622         return level_current;
1623 }
1624
1625
1626 static void
1627 acpi_video_switch_brightness (
1628         struct acpi_video_device *device,
1629         int     event)
1630 {
1631         unsigned long level_current, level_next;
1632         acpi_video_device_lcd_get_level_current(device, &level_current);
1633         level_next = acpi_video_get_next_level(device, level_current, event);
1634         acpi_video_device_lcd_set_level(device, level_next);
1635 }
1636
1637 static int
1638 acpi_video_bus_get_devices (
1639         struct acpi_video_bus   *video,
1640         struct acpi_device      *device)
1641 {
1642         int                     status = 0;
1643         struct list_head        *node, *next;
1644
1645         ACPI_FUNCTION_TRACE("acpi_video_get_devices");
1646
1647         acpi_video_device_enumerate(video);
1648
1649         list_for_each_safe(node, next, &device->children) {
1650                 struct acpi_device *dev = list_entry(node, struct acpi_device, node);
1651
1652                 if (!dev)
1653                         continue;
1654
1655                 status = acpi_video_bus_get_one_device(dev, video);
1656                 if (ACPI_FAILURE(status)) {
1657                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Cant attach device\n"));
1658                         continue;
1659                 }
1660
1661         }
1662         return_VALUE(status);
1663 }
1664
1665 static int
1666 acpi_video_bus_put_one_device(
1667         struct acpi_video_device        *device)
1668 {
1669         struct acpi_video_bus *video;
1670
1671         ACPI_FUNCTION_TRACE("acpi_video_bus_put_one_device");
1672
1673         if (!device || !device->video)
1674                 return_VALUE(-ENOENT);
1675
1676         video = device->video;
1677
1678         down(&video->sem);
1679         list_del(&device->entry);
1680         up(&video->sem);
1681         acpi_video_device_remove_fs(device->dev);
1682
1683         return_VALUE(0);
1684 }
1685
1686 static int
1687 acpi_video_bus_put_devices (
1688         struct acpi_video_bus   *video)
1689 {
1690         int                     status;
1691         struct list_head        *node, *next;
1692
1693         ACPI_FUNCTION_TRACE("acpi_video_bus_put_devices");
1694
1695         list_for_each_safe(node, next, &video->video_device_list) {
1696                 struct acpi_video_device *data = list_entry(node, struct acpi_video_device, entry);
1697                 if (!data)
1698                         continue;
1699
1700                 status = acpi_video_bus_put_one_device(data);
1701                 if(ACPI_FAILURE(status))
1702                         printk(KERN_WARNING PREFIX "hhuuhhuu bug in acpi video driver.\n");
1703
1704                 if (data->brightness)
1705                         kfree(data->brightness);
1706
1707                 kfree(data);
1708         }
1709
1710         return_VALUE(0);
1711 }
1712
1713 /* acpi_video interface */
1714
1715 static int
1716 acpi_video_bus_start_devices(
1717         struct acpi_video_bus   *video)
1718 {
1719         return acpi_video_bus_DOS(video, 1, 0);
1720 }
1721
1722 static int
1723 acpi_video_bus_stop_devices(
1724         struct acpi_video_bus   *video)
1725 {
1726         return acpi_video_bus_DOS(video, 0, 1);
1727 }
1728
1729 static void
1730 acpi_video_bus_notify (
1731         acpi_handle             handle,
1732         u32                     event,
1733         void                    *data)
1734 {
1735         struct acpi_video_bus   *video = (struct acpi_video_bus *) data;
1736         struct acpi_device      *device = NULL;
1737
1738         ACPI_FUNCTION_TRACE("acpi_video_bus_notify");
1739         printk("video bus notify\n");
1740
1741         if (!video)
1742                 return_VOID;
1743
1744         if (acpi_bus_get_device(handle, &device))
1745                 return_VOID;
1746
1747         switch (event) {
1748         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1749                                          * most likely via hotkey. */
1750                 acpi_bus_generate_event(device, event, 0);
1751                 break;
1752
1753         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1754                                          * connector. */
1755                 acpi_video_device_enumerate(video);
1756                 acpi_video_device_rebind(video);
1757                 acpi_video_switch_output(video, event);
1758                 acpi_bus_generate_event(device, event, 0);
1759                 break;
1760
1761         case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed.*/
1762         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1763         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1764                 acpi_video_switch_output(video, event);
1765                 acpi_bus_generate_event(device, event, 0);
1766                 break;
1767
1768         default:
1769                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1770                         "Unsupported event [0x%x]\n", event));
1771                 break;
1772         }
1773
1774         return_VOID;
1775 }
1776
1777 static void
1778 acpi_video_device_notify (
1779         acpi_handle             handle,
1780         u32                     event,
1781         void                    *data)
1782 {
1783         struct acpi_video_device        *video_device = (struct acpi_video_device *) data;
1784         struct acpi_device      *device = NULL;
1785
1786         ACPI_FUNCTION_TRACE("acpi_video_device_notify");
1787
1788         printk("video device notify\n");
1789         if (!video_device)
1790                 return_VOID;
1791
1792         if (acpi_bus_get_device(handle, &device))
1793                 return_VOID;
1794
1795         switch (event) {
1796         case ACPI_VIDEO_NOTIFY_SWITCH: /* change in status (cycle output device) */
1797         case ACPI_VIDEO_NOTIFY_PROBE: /* change in status (output device status) */
1798                 acpi_bus_generate_event(device, event, 0);
1799                 break;
1800         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1801         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1802         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1803         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1804         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1805                 acpi_video_switch_brightness (video_device, event);
1806                 acpi_bus_generate_event(device, event, 0);
1807                 break;
1808         default:
1809                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1810                         "Unsupported event [0x%x]\n", event));
1811                 break;
1812         }
1813         return_VOID;
1814 }
1815
1816 static int
1817 acpi_video_bus_add (
1818         struct acpi_device      *device)
1819 {
1820         int                     result = 0;
1821         acpi_status             status = 0;
1822         struct acpi_video_bus   *video = NULL;
1823
1824         ACPI_FUNCTION_TRACE("acpi_video_bus_add");
1825
1826         if (!device)
1827                 return_VALUE(-EINVAL);
1828
1829         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1830         if (!video)
1831                 return_VALUE(-ENOMEM);
1832         memset(video, 0, sizeof(struct acpi_video_bus));
1833
1834         video->handle = device->handle;
1835         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1836         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1837         acpi_driver_data(device) = video;
1838
1839         acpi_video_bus_find_cap(video);
1840         result = acpi_video_bus_check(video);
1841         if (result)
1842                 goto end;
1843
1844         result = acpi_video_bus_add_fs(device);
1845         if (result)
1846                 goto end;
1847
1848         init_MUTEX(&video->sem);
1849         INIT_LIST_HEAD(&video->video_device_list);
1850
1851         acpi_video_bus_get_devices(video, device);
1852         acpi_video_bus_start_devices(video);
1853
1854         status = acpi_install_notify_handler(video->handle,
1855                 ACPI_DEVICE_NOTIFY, acpi_video_bus_notify, video);
1856         if (ACPI_FAILURE(status)) {
1857                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1858                         "Error installing notify handler\n"));
1859                 result = -ENODEV;
1860                 goto end;
1861         }
1862
1863         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1864                 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1865                 video->flags.multihead ? "yes":"no",
1866                 video->flags.rom ? "yes":"no",
1867                 video->flags.post ? "yes":"no");
1868
1869 end:
1870         if (result) {
1871                 acpi_video_bus_remove_fs(device);
1872                 kfree(video);
1873         }
1874
1875         return_VALUE(result);
1876 }
1877
1878 static int
1879 acpi_video_bus_remove (
1880         struct acpi_device      *device,
1881         int                     type)
1882 {
1883         acpi_status             status = 0;
1884         struct acpi_video_bus   *video = NULL;
1885
1886         ACPI_FUNCTION_TRACE("acpi_video_bus_remove");
1887
1888         if (!device || !acpi_driver_data(device))
1889                 return_VALUE(-EINVAL);
1890
1891         video = (struct acpi_video_bus *) acpi_driver_data(device);
1892
1893         acpi_video_bus_stop_devices(video);
1894
1895         status = acpi_remove_notify_handler(video->handle,
1896                 ACPI_DEVICE_NOTIFY, acpi_video_bus_notify);
1897         if (ACPI_FAILURE(status))
1898                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1899                         "Error removing notify handler\n"));
1900
1901         acpi_video_bus_put_devices(video);
1902         acpi_video_bus_remove_fs(device);
1903
1904         if (video->attached_array)
1905                 kfree(video->attached_array);
1906         kfree(video);
1907
1908         return_VALUE(0);
1909 }
1910
1911
1912 static int
1913 acpi_video_bus_match (
1914         struct acpi_device      *device,
1915         struct acpi_driver      *driver)
1916 {
1917         acpi_handle             h_dummy1;
1918         acpi_handle             h_dummy2;
1919         acpi_handle             h_dummy3;
1920
1921         ACPI_FUNCTION_TRACE("acpi_video_bus_match");
1922
1923         if (!device || !driver)
1924                 return_VALUE(-EINVAL);
1925
1926         /* Since there is no HID, CID for ACPI Video drivers, we have
1927          * to check well known required nodes for each feature we support.
1928          */
1929
1930         /* Does this device able to support video switching ? */
1931         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1932             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1933                 return_VALUE(0);
1934
1935         /* Does this device able to retrieve a video ROM ? */
1936         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1937                 return_VALUE(0);
1938
1939         /* Does this device able to configure which video head to be POSTed ? */
1940         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1941             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1942             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1943                 return_VALUE(0);
1944
1945
1946         return_VALUE(-ENODEV);
1947 }
1948
1949
1950 static int __init
1951 acpi_video_init (void)
1952 {
1953         int                     result = 0;
1954
1955         ACPI_FUNCTION_TRACE("acpi_video_init");
1956
1957         /*
1958         acpi_dbg_level = 0xFFFFFFFF;
1959         acpi_dbg_layer = 0x08000000;
1960         */
1961
1962         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1963         if (!acpi_video_dir)
1964                 return_VALUE(-ENODEV);
1965         acpi_video_dir->owner = THIS_MODULE;
1966
1967         result = acpi_bus_register_driver(&acpi_video_bus);
1968         if (result < 0) {
1969                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1970                 return_VALUE(-ENODEV);
1971         }
1972
1973         return_VALUE(0);
1974 }
1975
1976 static void __exit
1977 acpi_video_exit (void)
1978 {
1979         ACPI_FUNCTION_TRACE("acpi_video_exit");
1980
1981         acpi_bus_unregister_driver(&acpi_video_bus);
1982
1983         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1984
1985         return_VOID;
1986 }
1987
1988 module_init(acpi_video_init);
1989 module_exit(acpi_video_exit);