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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *
   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 *
 573                                         sizeof *(br->levels), GFP_KERNEL);
 574                         if (!br->levels)
 575                                 goto out;
 576
 577                         for (i = 0; i < obj->package.count; i++) {
 578                                 o = (union acpi_object *) &obj->package.elements[i];
 579                                 if (o->type != ACPI_TYPE_INTEGER) {
 580                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 581                                         continue;
 582                                 }
 583                                 br->levels[count] = (u32) o->integer.value;
 584                                 count++;
 585                         }
 586 out:
 587                         if (count < 2) {
 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         kfree(obj);
 599
 600         return_VOID;
 601 }
 602
 603 /*
 604  *  Arg:
 605  *      device  : video output device (VGA)
 606  *
 607  *  Return Value:
 608  *      None
 609  *
 610  *  Find out all required AML method defined under the video bus device.
 611  */
 612
 613 static void
 614 acpi_video_bus_find_cap (struct acpi_video_bus *video)
 615 {
 616         acpi_handle     h_dummy1;
 617
 618         memset(&video->cap ,0, 4);
 619         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOS", &h_dummy1))) {
 620                 video->cap._DOS = 1;
 621         }
 622         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOD", &h_dummy1))) {
 623                 video->cap._DOD = 1;
 624         }
 625         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_ROM", &h_dummy1))) {
 626                 video->cap._ROM = 1;
 627         }
 628         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_GPD", &h_dummy1))) {
 629                 video->cap._GPD = 1;
 630         }
 631         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_SPD", &h_dummy1))) {
 632                 video->cap._SPD = 1;
 633         }
 634         if( ACPI_SUCCESS(acpi_get_handle(video->handle, "_VPO", &h_dummy1))) {
 635                 video->cap._VPO = 1;
 636         }
 637 }
 638
 639 /*
 640  * Check whether the video bus device has required AML method to
 641  * support the desired features
 642  */
 643
 644 static int
 645 acpi_video_bus_check (
 646         struct acpi_video_bus   *video)
 647 {
 648         acpi_status             status = -ENOENT;
 649
 650
 651         ACPI_FUNCTION_TRACE("acpi_video_bus_check");
 652
 653         if (!video)
 654                 return_VALUE(-EINVAL);
 655
 656         /* Since there is no HID, CID and so on for VGA driver, we have
 657          * to check well known required nodes.
 658          */
 659
 660         /* Does this device able to support video switching ? */
 661         if(video->cap._DOS){
 662                 video->flags.multihead = 1;
 663                 status = 0;
 664         }
 665
 666         /* Does this device able to retrieve a retrieve a video ROM ? */
 667         if(video->cap._ROM){
 668                 video->flags.rom = 1;
 669                 status = 0;
 670         }
 671
 672         /* Does this device able to configure which video device to POST ? */
 673         if(video->cap._GPD && video->cap._SPD && video->cap._VPO){
 674                 video->flags.post = 1;
 675                 status = 0;
 676         }
 677
 678         return_VALUE(status);
 679 }
 680
 681 /* --------------------------------------------------------------------------
 682                               FS Interface (/proc)
 683    -------------------------------------------------------------------------- */
 684
 685 static struct proc_dir_entry    *acpi_video_dir;
 686
 687 /* video devices */
 688
 689 static int
 690 acpi_video_device_info_seq_show (
 691         struct seq_file         *seq,
 692         void                    *offset)
 693 {
 694         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 695
 696         ACPI_FUNCTION_TRACE("acpi_video_device_info_seq_show");
 697
 698         if (!dev)
 699                 goto end;
 700
 701         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 702         seq_printf(seq, "type:         ");
 703         if (dev->flags.crt)
 704                 seq_printf(seq, "CRT\n");
 705         else if (dev->flags.lcd)
 706                 seq_printf(seq, "LCD\n");
 707         else if (dev->flags.tvout)
 708                 seq_printf(seq, "TVOUT\n");
 709         else
 710                 seq_printf(seq, "UNKNOWN\n");
 711
 712         seq_printf(seq,"known by bios: %s\n",
 713                    dev->flags.bios ? "yes":"no");
 714
 715 end:
 716         return_VALUE(0);
 717 }
 718
 719 static int
 720 acpi_video_device_info_open_fs (
 721         struct inode            *inode,
 722         struct file             *file)
 723 {
 724         return single_open(file, acpi_video_device_info_seq_show,
 725                            PDE(inode)->data);
 726 }
 727
 728 static int
 729 acpi_video_device_state_seq_show (
 730         struct seq_file         *seq,
 731         void                    *offset)
 732 {
 733         int                     status;
 734         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 735         unsigned long   state;
 736
 737         ACPI_FUNCTION_TRACE("acpi_video_device_state_seq_show");
 738
 739         if (!dev)
 740                 goto end;
 741
 742         status = acpi_video_device_get_state(dev, &state);
 743         seq_printf(seq, "state:     ");
 744         if (ACPI_SUCCESS(status))
 745                 seq_printf(seq, "0x%02lx\n", state);
 746         else
 747                 seq_printf(seq, "<not supported>\n");
 748
 749         status = acpi_video_device_query(dev, &state);
 750         seq_printf(seq, "query:     ");
 751         if (ACPI_SUCCESS(status))
 752                 seq_printf(seq, "0x%02lx\n", state);
 753         else
 754                 seq_printf(seq, "<not supported>\n");
 755
 756 end:
 757         return_VALUE(0);
 758 }
 759
 760 static int
 761 acpi_video_device_state_open_fs (
 762         struct inode            *inode,
 763         struct file             *file)
 764 {
 765         return single_open(file, acpi_video_device_state_seq_show,
 766                            PDE(inode)->data);
 767 }
 768
 769 static ssize_t
 770 acpi_video_device_write_state (
 771         struct file             *file,
 772         const char              __user *buffer,
 773         size_t                  count,
 774         loff_t                  *data)
 775 {
 776         int                     status;
 777         struct seq_file         *m = (struct seq_file *) file->private_data;
 778         struct acpi_video_device        *dev = (struct acpi_video_device *) m->private;
 779         char                    str[12] = {0};
 780         u32                     state = 0;
 781
 782         ACPI_FUNCTION_TRACE("acpi_video_device_write_state");
 783
 784         if (!dev || count + 1 > sizeof str)
 785                 return_VALUE(-EINVAL);
 786
 787         if (copy_from_user(str, buffer, count))
 788                 return_VALUE(-EFAULT);
 789
 790         str[count] = 0;
 791         state = simple_strtoul(str, NULL, 0);
 792         state &= ((1ul<<31) | (1ul<<30) | (1ul<<0));
 793
 794         status = acpi_video_device_set_state(dev, state);
 795
 796         if (status)
 797                 return_VALUE(-EFAULT);
 798
 799         return_VALUE(count);
 800 }
 801
 802 static int
 803 acpi_video_device_brightness_seq_show (
 804         struct seq_file         *seq,
 805         void                    *offset)
 806 {
 807         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 808         int                     i;
 809
 810         ACPI_FUNCTION_TRACE("acpi_video_device_brightness_seq_show");
 811
 812         if (!dev || !dev->brightness) {
 813                 seq_printf(seq, "<not supported>\n");
 814                 return_VALUE(0);
 815         }
 816
 817         seq_printf(seq, "levels: ");
 818         for (i = 0; i < dev->brightness->count; i++)
 819                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 820         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 821
 822         return_VALUE(0);
 823 }
 824
 825 static int
 826 acpi_video_device_brightness_open_fs (
 827         struct inode            *inode,
 828         struct file             *file)
 829 {
 830         return single_open(file, acpi_video_device_brightness_seq_show,
 831                            PDE(inode)->data);
 832 }
 833
 834 static ssize_t
 835 acpi_video_device_write_brightness (
 836         struct file             *file,
 837         const char              __user *buffer,
 838         size_t                  count,
 839         loff_t                  *data)
 840 {
 841         struct seq_file         *m = (struct seq_file *) file->private_data;
 842         struct acpi_video_device        *dev = (struct acpi_video_device *) m->private;
 843         char                    str[4] = {0};
 844         unsigned int            level = 0;
 845         int                     i;
 846
 847         ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 848
 849         if (!dev || count + 1 > sizeof str)
 850                 return_VALUE(-EINVAL);
 851
 852         if (copy_from_user(str, buffer, count))
 853                 return_VALUE(-EFAULT);
 854
 855         str[count] = 0;
 856         level = simple_strtoul(str, NULL, 0);
 857
 858         if (level > 100)
 859                 return_VALUE(-EFAULT);
 860
 861         /* validate though the list of available levels */
 862         for (i = 0; i < dev->brightness->count; i++)
 863                 if (level == dev->brightness->levels[i]) {
 864                         if (ACPI_SUCCESS(acpi_video_device_lcd_set_level(dev, level)))
 865                                 dev->brightness->curr = level;
 866                         break;
 867                 }
 868
 869         return_VALUE(count);
 870 }
 871
 872 static int
 873 acpi_video_device_EDID_seq_show (
 874         struct seq_file         *seq,
 875         void                    *offset)
 876 {
 877         struct acpi_video_device        *dev = (struct acpi_video_device *) seq->private;
 878         int                     status;
 879         int                     i;
 880         union acpi_object       *edid = NULL;
 881
 882         ACPI_FUNCTION_TRACE("acpi_video_device_EDID_seq_show");
 883
 884         if (!dev)
 885                 goto out;
 886
 887         status = acpi_video_device_EDID (dev, &edid, 128);
 888         if (ACPI_FAILURE(status)) {
 889                 status = acpi_video_device_EDID (dev, &edid, 256);
 890         }
 891
 892         if (ACPI_FAILURE(status)) {
 893                 goto out;
 894         }
 895
 896         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 897                 for (i = 0; i < edid->buffer.length; i++)
 898                         seq_putc(seq, edid->buffer.pointer[i]);
 899         }
 900
 901 out:
 902         if (!edid)
 903                 seq_printf(seq, "<not supported>\n");
 904         else
 905                 kfree(edid);
 906
 907         return_VALUE(0);
 908 }
 909
 910 static int
 911 acpi_video_device_EDID_open_fs (
 912         struct inode            *inode,
 913         struct file             *file)
 914 {
 915         return single_open(file, acpi_video_device_EDID_seq_show,
 916                            PDE(inode)->data);
 917 }
 918
 919
 920 static int
 921 acpi_video_device_add_fs (
 922         struct acpi_device      *device)
 923 {
 924         struct proc_dir_entry   *entry = NULL;
 925         struct acpi_video_device *vid_dev;
 926
 927         ACPI_FUNCTION_TRACE("acpi_video_device_add_fs");
 928
 929         if (!device)
 930                 return_VALUE(-ENODEV);
 931
 932         vid_dev = (struct acpi_video_device *) acpi_driver_data(device);
 933         if (!vid_dev)
 934                 return_VALUE(-ENODEV);
 935
 936         if (!acpi_device_dir(device)) {
 937                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 938                                 vid_dev->video->dir);
 939                 if (!acpi_device_dir(device))
 940                         return_VALUE(-ENODEV);
 941                 acpi_device_dir(device)->owner = THIS_MODULE;
 942         }
 943
 944         /* 'info' [R] */
 945         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 946         if (!entry)
 947                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 948                         "Unable to create 'info' fs entry\n"));
 949         else {
 950                 entry->proc_fops = &acpi_video_device_info_fops;
 951                 entry->data = acpi_driver_data(device);
 952                 entry->owner = THIS_MODULE;
 953         }
 954
 955         /* 'state' [R/W] */
 956         entry = create_proc_entry("state", S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 957         if (!entry)
 958                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 959                         "Unable to create 'state' fs entry\n"));
 960         else {
 961                 entry->proc_fops = &acpi_video_device_state_fops;
 962                 entry->proc_fops->write = acpi_video_device_write_state;
 963                 entry->data = acpi_driver_data(device);
 964                 entry->owner = THIS_MODULE;
 965         }
 966
 967         /* 'brightness' [R/W] */
 968         entry = create_proc_entry("brightness", S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 969         if (!entry)
 970                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 971                         "Unable to create 'brightness' fs entry\n"));
 972         else {
 973                 entry->proc_fops = &acpi_video_device_brightness_fops;
 974                 entry->proc_fops->write = acpi_video_device_write_brightness;
 975                 entry->data = acpi_driver_data(device);
 976                 entry->owner = THIS_MODULE;
 977         }
 978
 979         /* 'EDID' [R] */
 980         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 981         if (!entry)
 982                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 983                         "Unable to create 'brightness' fs entry\n"));
 984         else {
 985                 entry->proc_fops = &acpi_video_device_EDID_fops;
 986                 entry->data = acpi_driver_data(device);
 987                 entry->owner = THIS_MODULE;
 988         }
 989
 990         return_VALUE(0);
 991 }
 992
 993 static int
 994 acpi_video_device_remove_fs (
 995         struct acpi_device      *device)
 996 {
 997         struct acpi_video_device *vid_dev;
 998         ACPI_FUNCTION_TRACE("acpi_video_device_remove_fs");
 999
1000         vid_dev = (struct acpi_video_device *) acpi_driver_data(device);
1001         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1002                 return_VALUE(-ENODEV);
1003
1004         if (acpi_device_dir(device)) {
1005                 remove_proc_entry("info", acpi_device_dir(device));
1006                 remove_proc_entry("state", acpi_device_dir(device));
1007                 remove_proc_entry("brightness", acpi_device_dir(device));
1008                 remove_proc_entry("EDID", acpi_device_dir(device));
1009                 remove_proc_entry(acpi_device_bid(device),
1010                                  vid_dev->video->dir);
1011                 acpi_device_dir(device) = NULL;
1012         }
1013
1014         return_VALUE(0);
1015 }
1016
1017
1018 /* video bus */
1019 static int
1020 acpi_video_bus_info_seq_show (
1021         struct seq_file         *seq,
1022         void                    *offset)
1023 {
1024         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1025
1026         ACPI_FUNCTION_TRACE("acpi_video_bus_info_seq_show");
1027
1028         if (!video)
1029                 goto end;
1030
1031         seq_printf(seq, "Switching heads:              %s\n",
1032                         video->flags.multihead ? "yes":"no");
1033         seq_printf(seq, "Video ROM:                    %s\n",
1034                         video->flags.rom ? "yes":"no");
1035         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1036                         video->flags.post ? "yes":"no");
1037
1038 end:
1039         return_VALUE(0);
1040 }
1041
1042 static int
1043 acpi_video_bus_info_open_fs (
1044         struct inode            *inode,
1045         struct file             *file)
1046 {
1047         return single_open(file, acpi_video_bus_info_seq_show, PDE(inode)->data);
1048 }
1049
1050 static int
1051 acpi_video_bus_ROM_seq_show (
1052         struct seq_file         *seq,
1053         void                    *offset)
1054 {
1055         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1056
1057         ACPI_FUNCTION_TRACE("acpi_video_bus_ROM_seq_show");
1058
1059         if (!video)
1060                 goto end;
1061
1062         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1063         seq_printf(seq, "<TODO>\n");
1064
1065 end:
1066         return_VALUE(0);
1067 }
1068
1069 static int
1070 acpi_video_bus_ROM_open_fs (
1071         struct inode            *inode,
1072         struct file             *file)
1073 {
1074         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1075 }
1076
1077 static int
1078 acpi_video_bus_POST_info_seq_show (
1079         struct seq_file         *seq,
1080         void                    *offset)
1081 {
1082         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1083         unsigned long           options;
1084         int                     status;
1085
1086         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_info_seq_show");
1087
1088         if (!video)
1089                 goto end;
1090
1091         status = acpi_video_bus_POST_options(video, &options);
1092         if (ACPI_SUCCESS(status)) {
1093                 if (!(options & 1)) {
1094                         printk(KERN_WARNING PREFIX "The motherboard VGA device is not listed as a possible POST device.\n");
1095                         printk(KERN_WARNING PREFIX "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1096                 }
1097                 printk("%lx\n", options);
1098                 seq_printf(seq, "can POST: <intgrated video>");
1099                 if (options & 2)
1100                         seq_printf(seq, " <PCI video>");
1101                 if (options & 4)
1102                         seq_printf(seq, " <AGP video>");
1103                 seq_putc(seq, '\n');
1104         } else
1105                 seq_printf(seq, "<not supported>\n");
1106 end:
1107         return_VALUE(0);
1108 }
1109
1110 static int
1111 acpi_video_bus_POST_info_open_fs (
1112         struct inode            *inode,
1113         struct file             *file)
1114 {
1115         return single_open(file, acpi_video_bus_POST_info_seq_show, PDE(inode)->data);
1116 }
1117
1118 static int
1119 acpi_video_bus_POST_seq_show (
1120         struct seq_file         *seq,
1121         void                    *offset)
1122 {
1123         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1124         int                     status;
1125         unsigned long           id;
1126
1127         ACPI_FUNCTION_TRACE("acpi_video_bus_POST_seq_show");
1128
1129         if (!video)
1130                 goto end;
1131
1132         status = acpi_video_bus_get_POST (video, &id);
1133         if (!ACPI_SUCCESS(status)) {
1134                 seq_printf(seq, "<not supported>\n");
1135                 goto end;
1136         }
1137         seq_printf(seq, "device posted is <%s>\n",  device_decode[id & 3]);
1138
1139 end:
1140         return_VALUE(0);
1141 }
1142
1143 static int
1144 acpi_video_bus_DOS_seq_show (
1145         struct seq_file         *seq,
1146         void                    *offset)
1147 {
1148         struct acpi_video_bus   *video = (struct acpi_video_bus *) seq->private;
1149
1150         ACPI_FUNCTION_TRACE("acpi_video_bus_DOS_seq_show");
1151
1152         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting );
1153
1154         return_VALUE(0);
1155 }
1156
1157 static int
1158 acpi_video_bus_POST_open_fs (
1159         struct inode            *inode,
1160         struct file             *file)
1161 {
1162         return single_open(file, acpi_video_bus_POST_seq_show, PDE(inode)->data);
1163 }
1164
1165 static int
1166 acpi_video_bus_DOS_open_fs (
1167         struct inode            *inode,
1168         struct file             *file)
1169 {
1170         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1171 }
1172
1173 static ssize_t
1174 acpi_video_bus_write_POST (
1175         struct file             *file,
1176         const char              __user *buffer,
1177         size_t                  count,
1178         loff_t                  *data)
1179 {
1180         int                     status;
1181         struct seq_file         *m = (struct seq_file *) file->private_data;
1182         struct acpi_video_bus   *video = (struct acpi_video_bus *) m->private;
1183         char                    str[12] = {0};
1184         unsigned long           opt, options;
1185
1186         ACPI_FUNCTION_TRACE("acpi_video_bus_write_POST");
1187
1188
1189         if (!video || count + 1 > sizeof str)
1190                 return_VALUE(-EINVAL);
1191
1192         status = acpi_video_bus_POST_options(video, &options);
1193         if (!ACPI_SUCCESS(status))
1194                 return_VALUE(-EINVAL);
1195
1196         if (copy_from_user(str, buffer, count))
1197                 return_VALUE(-EFAULT);
1198
1199         str[count] = 0;
1200         opt = strtoul(str, NULL, 0);
1201         if (opt > 3)
1202                 return_VALUE(-EFAULT);
1203
1204         /* just in case an OEM 'forget' the motherboard... */
1205         options |= 1;
1206
1207         if (options & (1ul << opt)) {
1208                 status = acpi_video_bus_set_POST (video, opt);
1209                 if (!ACPI_SUCCESS(status))
1210                         return_VALUE(-EFAULT);
1211
1212         }
1213
1214
1215         return_VALUE(count);
1216 }
1217
1218 static ssize_t
1219 acpi_video_bus_write_DOS (
1220         struct file             *file,
1221         const char              __user *buffer,
1222         size_t                  count,
1223         loff_t                  *data)
1224 {
1225         int                     status;
1226         struct seq_file         *m = (struct seq_file *) file->private_data;
1227         struct acpi_video_bus   *video = (struct acpi_video_bus *) m->private;
1228         char                    str[12] = {0};
1229         unsigned long           opt;
1230
1231         ACPI_FUNCTION_TRACE("acpi_video_bus_write_DOS");
1232
1233
1234         if (!video || count + 1 > sizeof str)
1235                 return_VALUE(-EINVAL);
1236
1237         if (copy_from_user(str, buffer, count))
1238                 return_VALUE(-EFAULT);
1239
1240         str[count] = 0;
1241         opt = strtoul(str, NULL, 0);
1242         if (opt > 7)
1243                 return_VALUE(-EFAULT);
1244
1245         status = acpi_video_bus_DOS (video, opt & 0x3, (opt & 0x4)>>2);
1246
1247         if (!ACPI_SUCCESS(status))
1248                 return_VALUE(-EFAULT);
1249
1250         return_VALUE(count);
1251 }
1252
1253 static int
1254 acpi_video_bus_add_fs (
1255         struct acpi_device      *device)
1256 {
1257         struct proc_dir_entry   *entry = NULL;
1258         struct acpi_video_bus   *video;
1259
1260         ACPI_FUNCTION_TRACE("acpi_video_bus_add_fs");
1261
1262         video = (struct acpi_video_bus *) acpi_driver_data(device);
1263
1264         if (!acpi_device_dir(device)) {
1265                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1266                                 acpi_video_dir);
1267                 if (!acpi_device_dir(device))
1268                         return_VALUE(-ENODEV);
1269                 video->dir = acpi_device_dir(device);
1270                 acpi_device_dir(device)->owner = THIS_MODULE;
1271         }
1272
1273         /* 'info' [R] */
1274         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1275         if (!entry)
1276                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'info' fs entry\n"));
1277         else {
1278                 entry->proc_fops = &acpi_video_bus_info_fops;
1279                 entry->data = acpi_driver_data(device);
1280                 entry->owner = THIS_MODULE;
1281         }
1282
1283         /* 'ROM' [R] */
1284         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1285         if (!entry)
1286                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'ROM' fs entry\n"));
1287         else {
1288                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1289                 entry->data = acpi_driver_data(device);
1290                 entry->owner = THIS_MODULE;
1291         }
1292
1293         /* 'POST_info' [R] */
1294         entry = create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1295         if (!entry)
1296                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'POST_info' fs entry\n"));
1297         else {
1298                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1299                 entry->data = acpi_driver_data(device);
1300                 entry->owner = THIS_MODULE;
1301         }
1302
1303         /* 'POST' [R/W] */
1304         entry = create_proc_entry("POST", S_IFREG|S_IRUGO|S_IRUSR, acpi_device_dir(device));
1305         if (!entry)
1306                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'POST' fs entry\n"));
1307         else {
1308                 entry->proc_fops = &acpi_video_bus_POST_fops;
1309                 entry->proc_fops->write = acpi_video_bus_write_POST;
1310                 entry->data = acpi_driver_data(device);
1311                 entry->owner = THIS_MODULE;
1312         }
1313
1314         /* 'DOS' [R/W] */
1315         entry = create_proc_entry("DOS", S_IFREG|S_IRUGO|S_IRUSR, acpi_device_dir(device));
1316         if (!entry)
1317                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create 'DOS' fs entry\n"));
1318         else {
1319                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1320                 entry->proc_fops->write = acpi_video_bus_write_DOS;
1321                 entry->data = acpi_driver_data(device);
1322                 entry->owner = THIS_MODULE;
1323         }
1324
1325         return_VALUE(0);
1326 }
1327
1328 static int
1329 acpi_video_bus_remove_fs (
1330         struct acpi_device      *device)
1331 {
1332         struct acpi_video_bus   *video;
1333
1334         ACPI_FUNCTION_TRACE("acpi_video_bus_remove_fs");
1335
1336         video = (struct acpi_video_bus *) acpi_driver_data(device);
1337
1338         if (acpi_device_dir(device)) {
1339                 remove_proc_entry("info", acpi_device_dir(device));
1340                 remove_proc_entry("ROM", acpi_device_dir(device));
1341                 remove_proc_entry("POST_info", acpi_device_dir(device));
1342                 remove_proc_entry("POST", acpi_device_dir(device));
1343                 remove_proc_entry("DOS", acpi_device_dir(device));
1344                 remove_proc_entry(acpi_device_bid(device),
1345                                 acpi_video_dir);
1346                 acpi_device_dir(device) = NULL;
1347         }
1348
1349         return_VALUE(0);
1350 }
1351
1352 /* --------------------------------------------------------------------------
1353                                  Driver Interface
1354    -------------------------------------------------------------------------- */
1355
1356 /* device interface */
1357
1358 static int
1359 acpi_video_bus_get_one_device (
1360         struct acpi_device      *device,
1361         struct acpi_video_bus   *video)
1362 {
1363         unsigned long           device_id;
1364         int                     status, result;
1365         struct acpi_video_device        *data;
1366
1367         ACPI_FUNCTION_TRACE("acpi_video_bus_get_one_device");
1368
1369         if (!device || !video)
1370                 return_VALUE(-EINVAL);
1371
1372         status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1373         if (ACPI_SUCCESS(status)) {
1374
1375                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1376                 if (!data)
1377                         return_VALUE(-ENOMEM);
1378
1379                 memset(data, 0, sizeof(struct acpi_video_device));
1380
1381                 data->handle = device->handle;
1382                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1383                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1384                 acpi_driver_data(device) = data;
1385
1386                 data->device_id = device_id;
1387                 data->video = video;
1388                 data->dev = device;
1389
1390                 switch (device_id & 0xffff) {
1391                 case 0x0100:
1392                         data->flags.crt = 1;
1393                         break;
1394                 case 0x0400:
1395                         data->flags.lcd = 1;
1396                         break;
1397                 case 0x0200:
1398                         data->flags.tvout = 1;
1399                         break;
1400                 default:
1401                         data->flags.unknown = 1;
1402                         break;
1403                 }
1404
1405                 acpi_video_device_bind(video, data);
1406                 acpi_video_device_find_cap(data);
1407
1408                 status = acpi_install_notify_handler(data->handle,
1409                         ACPI_DEVICE_NOTIFY, acpi_video_device_notify, data);
1410                 if (ACPI_FAILURE(status)) {
1411                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1412                                 "Error installing notify handler\n"));
1413                         result = -ENODEV;
1414                         goto end;
1415                 }
1416
1417                 down(&video->sem);
1418                 list_add_tail(&data->entry, &video->video_device_list);
1419                 up(&video->sem);
1420
1421                 acpi_video_device_add_fs(device);
1422
1423                 return_VALUE(0);
1424         }
1425
1426 end:
1427         return_VALUE(-ENOENT);
1428 }
1429
1430 /*
1431  *  Arg:
1432  *      video   : video bus device
1433  *
1434  *  Return:
1435  *      none
1436  *
1437  *  Enumerate the video device list of the video bus,
1438  *  bind the ids with the corresponding video devices
1439  *  under the video bus.
1440  */
1441
1442 static void
1443 acpi_video_device_rebind( struct acpi_video_bus *video)
1444 {
1445         struct list_head * node, * next;
1446         list_for_each_safe(node, next, &video->video_device_list) {
1447                 struct acpi_video_device * dev = container_of(node, struct acpi_video_device, entry);
1448                 acpi_video_device_bind( video, dev);
1449         }
1450 }
1451
1452 /*
1453  *  Arg:
1454  *      video   : video bus device
1455  *      device  : video output device under the video
1456  *              bus
1457  *
1458  *  Return:
1459  *      none
1460  *
1461  *  Bind the ids with the corresponding video devices
1462  *  under the video bus.
1463  */
1464
1465 static void
1466 acpi_video_device_bind( struct acpi_video_bus *video,
1467                         struct acpi_video_device *device)
1468 {
1469         int     i;
1470         ACPI_FUNCTION_TRACE("acpi_video_device_bind");
1471
1472 #define IDS_VAL(i) video->attached_array[i].value.int_val
1473 #define IDS_BIND(i) video->attached_array[i].bind_info
1474
1475         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1476                 i < video->attached_count; i++) {
1477                 if (device->device_id == (IDS_VAL(i)& 0xffff)) {
1478                         IDS_BIND(i) = device;
1479                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1480                 }
1481         }
1482 #undef IDS_VAL
1483 #undef IDS_BIND
1484 }
1485
1486 /*
1487  *  Arg:
1488  *      video   : video bus device
1489  *
1490  *  Return:
1491  *      < 0     : error
1492  *
1493  *  Call _DOD to enumerate all devices attached to display adapter
1494  *
1495  */
1496
1497 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1498 {
1499         int                     status;
1500         int                     count;
1501         int                     i;
1502         struct acpi_video_enumerated_device *active_device_list;
1503         struct acpi_buffer      buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1504         union acpi_object       *dod = NULL;
1505         union acpi_object       *obj;
1506
1507         ACPI_FUNCTION_TRACE("acpi_video_device_enumerate");
1508
1509         status = acpi_evaluate_object(video->handle, "_DOD", NULL, &buffer);
1510         if (!ACPI_SUCCESS(status)) {
1511                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _DOD\n"));
1512                 return_VALUE(status);
1513         }
1514
1515         dod = (union acpi_object *) buffer.pointer;
1516         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1517                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1518                 status = -EFAULT;
1519                 goto out;
1520         }
1521
1522         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1523                 dod->package.count));
1524
1525         active_device_list= kmalloc(
1526                 (1+dod->package.count)*sizeof(struct acpi_video_enumerated_device),
1527                 GFP_KERNEL);
1528
1529         if (!active_device_list) {
1530                 status = -ENOMEM;
1531                 goto out;
1532         }
1533
1534         count = 0;
1535         for (i = 0; i < dod->package.count; i++) {
1536                 obj = (union acpi_object *) &dod->package.elements[i];
1537
1538                 if (obj->type != ACPI_TYPE_INTEGER) {
1539                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _DOD data\n"));
1540                         active_device_list[i].value.int_val = ACPI_VIDEO_HEAD_INVALID;
1541                 }
1542                 active_device_list[i].value.int_val = obj->integer.value;
1543                 active_device_list[i].bind_info = NULL;
1544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, (int) obj->integer.value));
1545                 count++;
1546         }
1547         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1548
1549         if(video->attached_array)
1550                 kfree(video->attached_array);
1551
1552         video->attached_array = active_device_list;
1553         video->attached_count = count;
1554 out:
1555         acpi_os_free(buffer.pointer);
1556         return_VALUE(status);
1557 }
1558
1559 /*
1560  *  Arg:
1561  *      video   : video bus device
1562  *      event   : Nontify Event
1563  *
1564  *  Return:
1565  *      < 0     : error
1566  *
1567  *      1. Find out the current active output device.
1568  *      2. Identify the next output device to switch
1569  *      3. call _DSS to do actual switch.
1570  */
1571
1572 static int
1573 acpi_video_switch_output(
1574         struct acpi_video_bus *video,
1575         int     event)
1576 {
1577         struct list_head * node, * next;
1578         struct acpi_video_device *dev=NULL;
1579         struct acpi_video_device *dev_next=NULL;
1580         struct acpi_video_device *dev_prev=NULL;
1581         unsigned long state;
1582         int status = 0;
1583
1584         ACPI_FUNCTION_TRACE("acpi_video_switch_output");
1585
1586         list_for_each_safe(node, next, &video->video_device_list) {
1587                 dev = container_of(node, struct acpi_video_device, entry);
1588                 status = acpi_video_device_get_state(dev, &state);
1589                 if (state & 0x2){
1590                         dev_next = container_of(node->next, struct acpi_video_device, entry);
1591                         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1592                         goto out;
1593                 }
1594         }
1595         dev_next = container_of(node->next, struct acpi_video_device, entry);
1596         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1597 out:
1598         switch (event) {
1599         case ACPI_VIDEO_NOTIFY_CYCLE:
1600         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1601                 acpi_video_device_set_state(dev, 0);
1602                 acpi_video_device_set_state(dev_next, 0x80000001);
1603                 break;
1604         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1605                 acpi_video_device_set_state(dev, 0);
1606                 acpi_video_device_set_state(dev_prev, 0x80000001);
1607         default:
1608                 break;
1609         }
1610
1611         return_VALUE(status);
1612 }
1613
1614 static int
1615 acpi_video_get_next_level(
1616         struct acpi_video_device *device,
1617         u32     level_current,
1618         u32     event)
1619 {
1620         /*Fix me*/
1621         return level_current;
1622 }
1623
1624
1625 static void
1626 acpi_video_switch_brightness (
1627         struct acpi_video_device *device,
1628         int     event)
1629 {
1630         unsigned long level_current, level_next;
1631         acpi_video_device_lcd_get_level_current(device, &level_current);
1632         level_next = acpi_video_get_next_level(device, level_current, event);
1633         acpi_video_device_lcd_set_level(device, level_next);
1634 }
1635
1636 static int
1637 acpi_video_bus_get_devices (
1638         struct acpi_video_bus   *video,
1639         struct acpi_device      *device)
1640 {
1641         int                     status = 0;
1642         struct list_head        *node, *next;
1643
1644         ACPI_FUNCTION_TRACE("acpi_video_get_devices");
1645
1646         acpi_video_device_enumerate(video);
1647
1648         list_for_each_safe(node, next, &device->children) {
1649                 struct acpi_device *dev = list_entry(node, struct acpi_device, node);
1650
1651                 if (!dev)
1652                         continue;
1653
1654                 status = acpi_video_bus_get_one_device(dev, video);
1655                 if (ACPI_FAILURE(status)) {
1656                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Cant attach device\n"));
1657                         continue;
1658                 }
1659
1660         }
1661         return_VALUE(status);
1662 }
1663
1664 static int
1665 acpi_video_bus_put_one_device(
1666         struct acpi_video_device        *device)
1667 {
1668         struct acpi_video_bus *video;
1669
1670         ACPI_FUNCTION_TRACE("acpi_video_bus_put_one_device");
1671
1672         if (!device || !device->video)
1673                 return_VALUE(-ENOENT);
1674
1675         video = device->video;
1676
1677         down(&video->sem);
1678         list_del(&device->entry);
1679         up(&video->sem);
1680         acpi_video_device_remove_fs(device->dev);
1681
1682         return_VALUE(0);
1683 }
1684
1685 static int
1686 acpi_video_bus_put_devices (
1687         struct acpi_video_bus   *video)
1688 {
1689         int                     status;
1690         struct list_head        *node, *next;
1691
1692         ACPI_FUNCTION_TRACE("acpi_video_bus_put_devices");
1693
1694         list_for_each_safe(node, next, &video->video_device_list) {
1695                 struct acpi_video_device *data = list_entry(node, struct acpi_video_device, entry);
1696                 if (!data)
1697                         continue;
1698
1699                 status = acpi_video_bus_put_one_device(data);
1700                 if(ACPI_FAILURE(status))
1701                         printk(KERN_WARNING PREFIX "hhuuhhuu bug in acpi video driver.\n");
1702
1703                 if (data->brightness)
1704                         kfree(data->brightness);
1705
1706                 kfree(data);
1707         }
1708
1709         return_VALUE(0);
1710 }
1711
1712 /* acpi_video interface */
1713
1714 static int
1715 acpi_video_bus_start_devices(
1716         struct acpi_video_bus   *video)
1717 {
1718         return acpi_video_bus_DOS(video, 1, 0);
1719 }
1720
1721 static int
1722 acpi_video_bus_stop_devices(
1723         struct acpi_video_bus   *video)
1724 {
1725         return acpi_video_bus_DOS(video, 0, 1);
1726 }
1727
1728 static void
1729 acpi_video_bus_notify (
1730         acpi_handle             handle,
1731         u32                     event,
1732         void                    *data)
1733 {
1734         struct acpi_video_bus   *video = (struct acpi_video_bus *) data;
1735         struct acpi_device      *device = NULL;
1736
1737         ACPI_FUNCTION_TRACE("acpi_video_bus_notify");
1738         printk("video bus notify\n");
1739
1740         if (!video)
1741                 return_VOID;
1742
1743         if (acpi_bus_get_device(handle, &device))
1744                 return_VOID;
1745
1746         switch (event) {
1747         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1748                                          * most likely via hotkey. */
1749                 acpi_bus_generate_event(device, event, 0);
1750                 break;
1751
1752         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1753                                          * connector. */
1754                 acpi_video_device_enumerate(video);
1755                 acpi_video_device_rebind(video);
1756                 acpi_video_switch_output(video, event);
1757                 acpi_bus_generate_event(device, event, 0);
1758                 break;
1759
1760         case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed.*/
1761         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1762         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1763                 acpi_video_switch_output(video, event);
1764                 acpi_bus_generate_event(device, event, 0);
1765                 break;
1766
1767         default:
1768                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1769                         "Unsupported event [0x%x]\n", event));
1770                 break;
1771         }
1772
1773         return_VOID;
1774 }
1775
1776 static void
1777 acpi_video_device_notify (
1778         acpi_handle             handle,
1779         u32                     event,
1780         void                    *data)
1781 {
1782         struct acpi_video_device        *video_device = (struct acpi_video_device *) data;
1783         struct acpi_device      *device = NULL;
1784
1785         ACPI_FUNCTION_TRACE("acpi_video_device_notify");
1786
1787         printk("video device notify\n");
1788         if (!video_device)
1789                 return_VOID;
1790
1791         if (acpi_bus_get_device(handle, &device))
1792                 return_VOID;
1793
1794         switch (event) {
1795         case ACPI_VIDEO_NOTIFY_SWITCH: /* change in status (cycle output device) */
1796         case ACPI_VIDEO_NOTIFY_PROBE: /* change in status (output device status) */
1797                 acpi_bus_generate_event(device, event, 0);
1798                 break;
1799         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1800         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1801         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1802         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1803         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1804                 acpi_video_switch_brightness (video_device, event);
1805                 acpi_bus_generate_event(device, event, 0);
1806                 break;
1807         default:
1808                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1809                         "Unsupported event [0x%x]\n", event));
1810                 break;
1811         }
1812         return_VOID;
1813 }
1814
1815 static int
1816 acpi_video_bus_add (
1817         struct acpi_device      *device)
1818 {
1819         int                     result = 0;
1820         acpi_status             status = 0;
1821         struct acpi_video_bus   *video = NULL;
1822
1823         ACPI_FUNCTION_TRACE("acpi_video_bus_add");
1824
1825         if (!device)
1826                 return_VALUE(-EINVAL);
1827
1828         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1829         if (!video)
1830                 return_VALUE(-ENOMEM);
1831         memset(video, 0, sizeof(struct acpi_video_bus));
1832
1833         video->handle = device->handle;
1834         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1835         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1836         acpi_driver_data(device) = video;
1837
1838         acpi_video_bus_find_cap(video);
1839         result = acpi_video_bus_check(video);
1840         if (result)
1841                 goto end;
1842
1843         result = acpi_video_bus_add_fs(device);
1844         if (result)
1845                 goto end;
1846
1847         init_MUTEX(&video->sem);
1848         INIT_LIST_HEAD(&video->video_device_list);
1849
1850         acpi_video_bus_get_devices(video, device);
1851         acpi_video_bus_start_devices(video);
1852
1853         status = acpi_install_notify_handler(video->handle,
1854                 ACPI_DEVICE_NOTIFY, acpi_video_bus_notify, video);
1855         if (ACPI_FAILURE(status)) {
1856                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1857                         "Error installing notify handler\n"));
1858                 result = -ENODEV;
1859                 goto end;
1860         }
1861
1862         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1863                 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1864                 video->flags.multihead ? "yes":"no",
1865                 video->flags.rom ? "yes":"no",
1866                 video->flags.post ? "yes":"no");
1867
1868 end:
1869         if (result) {
1870                 acpi_video_bus_remove_fs(device);
1871                 kfree(video);
1872         }
1873
1874         return_VALUE(result);
1875 }
1876
1877 static int
1878 acpi_video_bus_remove (
1879         struct acpi_device      *device,
1880         int                     type)
1881 {
1882         acpi_status             status = 0;
1883         struct acpi_video_bus   *video = NULL;
1884
1885         ACPI_FUNCTION_TRACE("acpi_video_bus_remove");
1886
1887         if (!device || !acpi_driver_data(device))
1888                 return_VALUE(-EINVAL);
1889
1890         video = (struct acpi_video_bus *) acpi_driver_data(device);
1891
1892         acpi_video_bus_stop_devices(video);
1893
1894         status = acpi_remove_notify_handler(video->handle,
1895                 ACPI_DEVICE_NOTIFY, acpi_video_bus_notify);
1896         if (ACPI_FAILURE(status))
1897                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1898                         "Error removing notify handler\n"));
1899
1900         acpi_video_bus_put_devices(video);
1901         acpi_video_bus_remove_fs(device);
1902
1903         if (video->attached_array)
1904                 kfree(video->attached_array);
1905         kfree(video);
1906
1907         return_VALUE(0);
1908 }
1909
1910
1911 static int
1912 acpi_video_bus_match (
1913         struct acpi_device      *device,
1914         struct acpi_driver      *driver)
1915 {
1916         acpi_handle             h_dummy1;
1917         acpi_handle             h_dummy2;
1918         acpi_handle             h_dummy3;
1919
1920         ACPI_FUNCTION_TRACE("acpi_video_bus_match");
1921
1922         if (!device || !driver)
1923                 return_VALUE(-EINVAL);
1924
1925         /* Since there is no HID, CID for ACPI Video drivers, we have
1926          * to check well known required nodes for each feature we support.
1927          */
1928
1929         /* Does this device able to support video switching ? */
1930         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1931             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1932                 return_VALUE(0);
1933
1934         /* Does this device able to retrieve a video ROM ? */
1935         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1936                 return_VALUE(0);
1937
1938         /* Does this device able to configure which video head to be POSTed ? */
1939         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1940             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1941             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1942                 return_VALUE(0);
1943
1944
1945         return_VALUE(-ENODEV);
1946 }
1947
1948
1949 static int __init
1950 acpi_video_init (void)
1951 {
1952         int                     result = 0;
1953
1954         ACPI_FUNCTION_TRACE("acpi_video_init");
1955
1956         /*
1957         acpi_dbg_level = 0xFFFFFFFF;
1958         acpi_dbg_layer = 0x08000000;
1959         */
1960
1961         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1962         if (!acpi_video_dir)
1963                 return_VALUE(-ENODEV);
1964         acpi_video_dir->owner = THIS_MODULE;
1965
1966         result = acpi_bus_register_driver(&acpi_video_bus);
1967         if (result < 0) {
1968                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1969                 return_VALUE(-ENODEV);
1970         }
1971
1972         return_VALUE(0);
1973 }
1974
1975 static void __exit
1976 acpi_video_exit (void)
1977 {
1978         ACPI_FUNCTION_TRACE("acpi_video_exit");
1979
1980         acpi_bus_unregister_driver(&acpi_video_bus);
1981
1982         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1983
1984         return_VOID;
1985 }
1986
1987 module_init(acpi_video_init);
1988 module_exit(acpi_video_exit);