drivers/acpi/video.c

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