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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  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/seq_file.h>
  34
  35 #include <linux/backlight.h>
  36 #include <asm/uaccess.h>
  37
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define ACPI_VIDEO_COMPONENT            0x08000000
  42 #define ACPI_VIDEO_CLASS                "video"
  43 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  44 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  45 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  46 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  47 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  48 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  49 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  50
  51 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  52 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  53 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  54 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  55 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  56
  57 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  58 #define ACPI_VIDEO_HEAD_END             (~0u)
  59 #define MAX_NAME_LEN    20
  60
  61 #define ACPI_VIDEO_DISPLAY_CRT  1
  62 #define ACPI_VIDEO_DISPLAY_TV   2
  63 #define ACPI_VIDEO_DISPLAY_DVI  3
  64 #define ACPI_VIDEO_DISPLAY_LCD  4
  65
  66 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  67 ACPI_MODULE_NAME("video");
  68
  69 MODULE_AUTHOR("Bruno Ducrot");
  70 MODULE_DESCRIPTION("ACPI Video Driver");
  71 MODULE_LICENSE("GPL");
  72
  73 static int acpi_video_bus_add(struct acpi_device *device);
  74 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  75
  76 static struct acpi_driver acpi_video_bus = {
  77         .name = "video",
  78         .class = ACPI_VIDEO_CLASS,
  79         .ids = ACPI_VIDEO_HID,
  80         .ops = {
  81                 .add = acpi_video_bus_add,
  82                 .remove = acpi_video_bus_remove,
  83                 },
  84 };
  85
  86 struct acpi_video_bus_flags {
  87         u8 multihead:1;         /* can switch video heads */
  88         u8 rom:1;               /* can retrieve a video rom */
  89         u8 post:1;              /* can configure the head to */
  90         u8 reserved:5;
  91 };
  92
  93 struct acpi_video_bus_cap {
  94         u8 _DOS:1;              /*Enable/Disable output switching */
  95         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
  96         u8 _ROM:1;              /*Get ROM Data */
  97         u8 _GPD:1;              /*Get POST Device */
  98         u8 _SPD:1;              /*Set POST Device */
  99         u8 _VPO:1;              /*Video POST Options */
 100         u8 reserved:2;
 101 };
 102
 103 struct acpi_video_device_attrib {
 104         u32 display_index:4;    /* A zero-based instance of the Display */
 105         u32 display_port_attachment:4;  /*This field differenates displays type */
 106         u32 display_type:4;     /*Describe the specific type in use */
 107         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
 108         u32 bios_can_detect:1;  /*BIOS can detect the device */
 109         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 110                                    the VGA device. */
 111         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 112         u32 reserved:10;        /*Must be 0 */
 113         u32 device_id_scheme:1; /*Device ID Scheme */
 114 };
 115
 116 struct acpi_video_enumerated_device {
 117         union {
 118                 u32 int_val;
 119                 struct acpi_video_device_attrib attrib;
 120         } value;
 121         struct acpi_video_device *bind_info;
 122 };
 123
 124 struct acpi_video_bus {
 125         struct acpi_device *device;
 126         u8 dos_setting;
 127         struct acpi_video_enumerated_device *attached_array;
 128         u8 attached_count;
 129         struct acpi_video_bus_cap cap;
 130         struct acpi_video_bus_flags flags;
 131         struct semaphore sem;
 132         struct list_head video_device_list;
 133         struct proc_dir_entry *dir;
 134 };
 135
 136 struct acpi_video_device_flags {
 137         u8 crt:1;
 138         u8 lcd:1;
 139         u8 tvout:1;
 140         u8 dvi:1;
 141         u8 bios:1;
 142         u8 unknown:1;
 143         u8 reserved:2;
 144 };
 145
 146 struct acpi_video_device_cap {
 147         u8 _ADR:1;              /*Return the unique ID */
 148         u8 _BCL:1;              /*Query list of brightness control levels supported */
 149         u8 _BCM:1;              /*Set the brightness level */
 150         u8 _BQC:1;              /* Get current brightness level */
 151         u8 _DDC:1;              /*Return the EDID for this device */
 152         u8 _DCS:1;              /*Return status of output device */
 153         u8 _DGS:1;              /*Query graphics state */
 154         u8 _DSS:1;              /*Device state set */
 155 };
 156
 157 struct acpi_video_device_brightness {
 158         int curr;
 159         int count;
 160         int *levels;
 161 };
 162
 163 struct acpi_video_device {
 164         unsigned long device_id;
 165         struct acpi_video_device_flags flags;
 166         struct acpi_video_device_cap cap;
 167         struct list_head entry;
 168         struct acpi_video_bus *video;
 169         struct acpi_device *dev;
 170         struct acpi_video_device_brightness *brightness;
 171         struct backlight_device *backlight;
 172 };
 173
 174 /* bus */
 175 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 176 static struct file_operations acpi_video_bus_info_fops = {
 177         .open = acpi_video_bus_info_open_fs,
 178         .read = seq_read,
 179         .llseek = seq_lseek,
 180         .release = single_release,
 181 };
 182
 183 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 184 static struct file_operations acpi_video_bus_ROM_fops = {
 185         .open = acpi_video_bus_ROM_open_fs,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 192                                             struct file *file);
 193 static struct file_operations acpi_video_bus_POST_info_fops = {
 194         .open = acpi_video_bus_POST_info_open_fs,
 195         .read = seq_read,
 196         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 201 static struct file_operations acpi_video_bus_POST_fops = {
 202         .open = acpi_video_bus_POST_open_fs,
 203         .read = seq_read,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 209 static struct file_operations acpi_video_bus_DOS_fops = {
 210         .open = acpi_video_bus_DOS_open_fs,
 211         .read = seq_read,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 /* device */
 217 static int acpi_video_device_info_open_fs(struct inode *inode,
 218                                           struct file *file);
 219 static struct file_operations acpi_video_device_info_fops = {
 220         .open = acpi_video_device_info_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static int acpi_video_device_state_open_fs(struct inode *inode,
 227                                            struct file *file);
 228 static struct file_operations acpi_video_device_state_fops = {
 229         .open = acpi_video_device_state_open_fs,
 230         .read = seq_read,
 231         .llseek = seq_lseek,
 232         .release = single_release,
 233 };
 234
 235 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 236                                                 struct file *file);
 237 static struct file_operations acpi_video_device_brightness_fops = {
 238         .open = acpi_video_device_brightness_open_fs,
 239         .read = seq_read,
 240         .llseek = seq_lseek,
 241         .release = single_release,
 242 };
 243
 244 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 245                                           struct file *file);
 246 static struct file_operations acpi_video_device_EDID_fops = {
 247         .open = acpi_video_device_EDID_open_fs,
 248         .read = seq_read,
 249         .llseek = seq_lseek,
 250         .release = single_release,
 251 };
 252
 253 static char device_decode[][30] = {
 254         "motherboard VGA device",
 255         "PCI VGA device",
 256         "AGP VGA device",
 257         "UNKNOWN",
 258 };
 259
 260 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 261 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 262 static void acpi_video_device_bind(struct acpi_video_bus *video,
 263                                    struct acpi_video_device *device);
 264 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 265 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 266 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 267                         int level);
 268 static int acpi_video_device_lcd_get_level_current(
 269                         struct acpi_video_device *device,
 270                         unsigned long *level);
 271 static int acpi_video_get_next_level(struct acpi_video_device *device,
 272                                      u32 level_current, u32 event);
 273 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 274                                          int event);
 275
 276 /*backlight device sysfs support*/
 277 static int acpi_video_get_brightness(struct backlight_device *bd)
 278 {
 279         unsigned long cur_level;
 280         struct acpi_video_device *vd =
 281                 (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
 282         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 283         return (int) cur_level;
 284 }
 285
 286 static int acpi_video_set_brightness(struct backlight_device *bd)
 287 {
 288         int request_level = bd->props.brightness;
 289         struct acpi_video_device *vd =
 290                 (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
 291         acpi_video_device_lcd_set_level(vd, request_level);
 292         return 0;
 293 }
 294
 295 static struct backlight_ops acpi_backlight_ops = {
 296         .get_brightness = acpi_video_get_brightness,
 297         .update_status  = acpi_video_set_brightness,
 298 };
 299
 300 /* --------------------------------------------------------------------------
 301                                Video Management
 302    -------------------------------------------------------------------------- */
 303
 304 /* device */
 305
 306 static int
 307 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 308 {
 309         int status;
 310
 311         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 312
 313         return status;
 314 }
 315
 316 static int
 317 acpi_video_device_get_state(struct acpi_video_device *device,
 318                             unsigned long *state)
 319 {
 320         int status;
 321
 322         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 323
 324         return status;
 325 }
 326
 327 static int
 328 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 329 {
 330         int status;
 331         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 332         struct acpi_object_list args = { 1, &arg0 };
 333         unsigned long ret;
 334
 335
 336         arg0.integer.value = state;
 337         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 338
 339         return status;
 340 }
 341
 342 static int
 343 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 344                                    union acpi_object **levels)
 345 {
 346         int status;
 347         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 348         union acpi_object *obj;
 349
 350
 351         *levels = NULL;
 352
 353         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 354         if (!ACPI_SUCCESS(status))
 355                 return status;
 356         obj = (union acpi_object *)buffer.pointer;
 357         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 358                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 359                 status = -EFAULT;
 360                 goto err;
 361         }
 362
 363         *levels = obj;
 364
 365         return 0;
 366
 367       err:
 368         kfree(buffer.pointer);
 369
 370         return status;
 371 }
 372
 373 static int
 374 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 375 {
 376         int status;
 377         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 378         struct acpi_object_list args = { 1, &arg0 };
 379
 380
 381         arg0.integer.value = level;
 382         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 383
 384         printk(KERN_DEBUG "set_level status: %x\n", status);
 385         return status;
 386 }
 387
 388 static int
 389 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 390                                         unsigned long *level)
 391 {
 392         int status;
 393
 394         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
 395
 396         return status;
 397 }
 398
 399 static int
 400 acpi_video_device_EDID(struct acpi_video_device *device,
 401                        union acpi_object **edid, ssize_t length)
 402 {
 403         int status;
 404         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 405         union acpi_object *obj;
 406         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 407         struct acpi_object_list args = { 1, &arg0 };
 408
 409
 410         *edid = NULL;
 411
 412         if (!device)
 413                 return -ENODEV;
 414         if (length == 128)
 415                 arg0.integer.value = 1;
 416         else if (length == 256)
 417                 arg0.integer.value = 2;
 418         else
 419                 return -EINVAL;
 420
 421         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 422         if (ACPI_FAILURE(status))
 423                 return -ENODEV;
 424
 425         obj = buffer.pointer;
 426
 427         if (obj && obj->type == ACPI_TYPE_BUFFER)
 428                 *edid = obj;
 429         else {
 430                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 431                 status = -EFAULT;
 432                 kfree(obj);
 433         }
 434
 435         return status;
 436 }
 437
 438 /* bus */
 439
 440 static int
 441 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 442 {
 443         int status;
 444         unsigned long tmp;
 445         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 446         struct acpi_object_list args = { 1, &arg0 };
 447
 448
 449         arg0.integer.value = option;
 450
 451         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 452         if (ACPI_SUCCESS(status))
 453                 status = tmp ? (-EINVAL) : (AE_OK);
 454
 455         return status;
 456 }
 457
 458 static int
 459 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 460 {
 461         int status;
 462
 463         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 464
 465         return status;
 466 }
 467
 468 static int
 469 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 470                             unsigned long *options)
 471 {
 472         int status;
 473
 474         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 475         *options &= 3;
 476
 477         return status;
 478 }
 479
 480 /*
 481  *  Arg:
 482  *      video           : video bus device pointer
 483  *      bios_flag       :
 484  *              0.      The system BIOS should NOT automatically switch(toggle)
 485  *                      the active display output.
 486  *              1.      The system BIOS should automatically switch (toggle) the
 487  *                      active display output. No swich event.
 488  *              2.      The _DGS value should be locked.
 489  *              3.      The system BIOS should not automatically switch (toggle) the
 490  *                      active display output, but instead generate the display switch
 491  *                      event notify code.
 492  *      lcd_flag        :
 493  *              0.      The system BIOS should automatically control the brightness level
 494  *                      of the LCD, when the power changes from AC to DC
 495  *              1.      The system BIOS should NOT automatically control the brightness
 496  *                      level of the LCD, when the power changes from AC to DC.
 497  * Return Value:
 498  *              -1      wrong arg.
 499  */
 500
 501 static int
 502 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 503 {
 504         acpi_integer status = 0;
 505         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 506         struct acpi_object_list args = { 1, &arg0 };
 507
 508
 509         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 510                 status = -1;
 511                 goto Failed;
 512         }
 513         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 514         video->dos_setting = arg0.integer.value;
 515         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 516
 517       Failed:
 518         return status;
 519 }
 520
 521 /*
 522  *  Arg:
 523  *      device  : video output device (LCD, CRT, ..)
 524  *
 525  *  Return Value:
 526  *      None
 527  *
 528  *  Find out all required AML method defined under the output
 529  *  device.
 530  */
 531
 532 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 533 {
 534         acpi_integer status;
 535         acpi_handle h_dummy1;
 536         int i;
 537         u32 max_level = 0;
 538         union acpi_object *obj = NULL;
 539         struct acpi_video_device_brightness *br = NULL;
 540
 541
 542         memset(&device->cap, 0, 4);
 543
 544         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 545                 device->cap._ADR = 1;
 546         }
 547         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 548                 device->cap._BCL = 1;
 549         }
 550         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 551                 device->cap._BCM = 1;
 552         }
 553         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 554                 device->cap._BQC = 1;
 555         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 556                 device->cap._DDC = 1;
 557         }
 558         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 559                 device->cap._DCS = 1;
 560         }
 561         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 562                 device->cap._DGS = 1;
 563         }
 564         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 565                 device->cap._DSS = 1;
 566         }
 567
 568         status = acpi_video_device_lcd_query_levels(device, &obj);
 569
 570         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 571                 int count = 0;
 572                 union acpi_object *o;
 573
 574                 br = kzalloc(sizeof(*br), GFP_KERNEL);
 575                 if (!br) {
 576                         printk(KERN_ERR "can't allocate memory\n");
 577                 } else {
 578                         br->levels = kmalloc(obj->package.count *
 579                                              sizeof *(br->levels), GFP_KERNEL);
 580                         if (!br->levels)
 581                                 goto out;
 582
 583                         for (i = 0; i < obj->package.count; i++) {
 584                                 o = (union acpi_object *)&obj->package.
 585                                     elements[i];
 586                                 if (o->type != ACPI_TYPE_INTEGER) {
 587                                         printk(KERN_ERR PREFIX "Invalid data\n");
 588                                         continue;
 589                                 }
 590                                 br->levels[count] = (u32) o->integer.value;
 591                                 if (br->levels[count] > max_level)
 592                                         max_level = br->levels[count];
 593                                 count++;
 594                         }
 595                       out:
 596                         if (count < 2) {
 597                                 kfree(br->levels);
 598                                 kfree(br);
 599                         } else {
 600                                 br->count = count;
 601                                 device->brightness = br;
 602                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 603                                                   "found %d brightness levels\n",
 604                                                   count));
 605                         }
 606                 }
 607         }
 608
 609         kfree(obj);
 610
 611         if (device->cap._BCL && device->cap._BCM && device->cap._BQC){
 612                 unsigned long tmp;
 613                 static int count = 0;
 614                 char *name;
 615                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 616                 if (!name)
 617                         return;
 618
 619                 sprintf(name, "acpi_video%d", count++);
 620                 acpi_video_device_lcd_get_level_current(device, &tmp);
 621                 device->backlight = backlight_device_register(name,
 622                         NULL, device, &acpi_backlight_ops);
 623                 device->backlight->props.max_brightness = max_level;
 624                 device->backlight->props.brightness = (int)tmp;
 625                 backlight_update_status(device->backlight);
 626
 627                 kfree(name);
 628         }
 629         return;
 630 }
 631
 632 /*
 633  *  Arg:
 634  *      device  : video output device (VGA)
 635  *
 636  *  Return Value:
 637  *      None
 638  *
 639  *  Find out all required AML method defined under the video bus device.
 640  */
 641
 642 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 643 {
 644         acpi_handle h_dummy1;
 645
 646         memset(&video->cap, 0, 4);
 647         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 648                 video->cap._DOS = 1;
 649         }
 650         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 651                 video->cap._DOD = 1;
 652         }
 653         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 654                 video->cap._ROM = 1;
 655         }
 656         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 657                 video->cap._GPD = 1;
 658         }
 659         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 660                 video->cap._SPD = 1;
 661         }
 662         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 663                 video->cap._VPO = 1;
 664         }
 665 }
 666
 667 /*
 668  * Check whether the video bus device has required AML method to
 669  * support the desired features
 670  */
 671
 672 static int acpi_video_bus_check(struct acpi_video_bus *video)
 673 {
 674         acpi_status status = -ENOENT;
 675
 676
 677         if (!video)
 678                 return -EINVAL;
 679
 680         /* Since there is no HID, CID and so on for VGA driver, we have
 681          * to check well known required nodes.
 682          */
 683
 684         /* Does this device able to support video switching ? */
 685         if (video->cap._DOS) {
 686                 video->flags.multihead = 1;
 687                 status = 0;
 688         }
 689
 690         /* Does this device able to retrieve a retrieve a video ROM ? */
 691         if (video->cap._ROM) {
 692                 video->flags.rom = 1;
 693                 status = 0;
 694         }
 695
 696         /* Does this device able to configure which video device to POST ? */
 697         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 698                 video->flags.post = 1;
 699                 status = 0;
 700         }
 701
 702         return status;
 703 }
 704
 705 /* --------------------------------------------------------------------------
 706                               FS Interface (/proc)
 707    -------------------------------------------------------------------------- */
 708
 709 static struct proc_dir_entry *acpi_video_dir;
 710
 711 /* video devices */
 712
 713 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 714 {
 715         struct acpi_video_device *dev = seq->private;
 716
 717
 718         if (!dev)
 719                 goto end;
 720
 721         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 722         seq_printf(seq, "type:         ");
 723         if (dev->flags.crt)
 724                 seq_printf(seq, "CRT\n");
 725         else if (dev->flags.lcd)
 726                 seq_printf(seq, "LCD\n");
 727         else if (dev->flags.tvout)
 728                 seq_printf(seq, "TVOUT\n");
 729         else if (dev->flags.dvi)
 730                 seq_printf(seq, "DVI\n");
 731         else
 732                 seq_printf(seq, "UNKNOWN\n");
 733
 734         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 735
 736       end:
 737         return 0;
 738 }
 739
 740 static int
 741 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 742 {
 743         return single_open(file, acpi_video_device_info_seq_show,
 744                            PDE(inode)->data);
 745 }
 746
 747 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 748 {
 749         int status;
 750         struct acpi_video_device *dev = seq->private;
 751         unsigned long state;
 752
 753
 754         if (!dev)
 755                 goto end;
 756
 757         status = acpi_video_device_get_state(dev, &state);
 758         seq_printf(seq, "state:     ");
 759         if (ACPI_SUCCESS(status))
 760                 seq_printf(seq, "0x%02lx\n", state);
 761         else
 762                 seq_printf(seq, "<not supported>\n");
 763
 764         status = acpi_video_device_query(dev, &state);
 765         seq_printf(seq, "query:     ");
 766         if (ACPI_SUCCESS(status))
 767                 seq_printf(seq, "0x%02lx\n", state);
 768         else
 769                 seq_printf(seq, "<not supported>\n");
 770
 771       end:
 772         return 0;
 773 }
 774
 775 static int
 776 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 777 {
 778         return single_open(file, acpi_video_device_state_seq_show,
 779                            PDE(inode)->data);
 780 }
 781
 782 static ssize_t
 783 acpi_video_device_write_state(struct file *file,
 784                               const char __user * buffer,
 785                               size_t count, loff_t * data)
 786 {
 787         int status;
 788         struct seq_file *m = file->private_data;
 789         struct acpi_video_device *dev = m->private;
 790         char str[12] = { 0 };
 791         u32 state = 0;
 792
 793
 794         if (!dev || count + 1 > sizeof str)
 795                 return -EINVAL;
 796
 797         if (copy_from_user(str, buffer, count))
 798                 return -EFAULT;
 799
 800         str[count] = 0;
 801         state = simple_strtoul(str, NULL, 0);
 802         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 803
 804         status = acpi_video_device_set_state(dev, state);
 805
 806         if (status)
 807                 return -EFAULT;
 808
 809         return count;
 810 }
 811
 812 static int
 813 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 814 {
 815         struct acpi_video_device *dev = seq->private;
 816         int i;
 817
 818
 819         if (!dev || !dev->brightness) {
 820                 seq_printf(seq, "<not supported>\n");
 821                 return 0;
 822         }
 823
 824         seq_printf(seq, "levels: ");
 825         for (i = 0; i < dev->brightness->count; i++)
 826                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 827         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 828
 829         return 0;
 830 }
 831
 832 static int
 833 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 834 {
 835         return single_open(file, acpi_video_device_brightness_seq_show,
 836                            PDE(inode)->data);
 837 }
 838
 839 static ssize_t
 840 acpi_video_device_write_brightness(struct file *file,
 841                                    const char __user * buffer,
 842                                    size_t count, loff_t * data)
 843 {
 844         struct seq_file *m = file->private_data;
 845         struct acpi_video_device *dev = m->private;
 846         char str[4] = { 0 };
 847         unsigned int level = 0;
 848         int i;
 849
 850
 851         if (!dev || !dev->brightness || count + 1 > sizeof str)
 852                 return -EINVAL;
 853
 854         if (copy_from_user(str, buffer, count))
 855                 return -EFAULT;
 856
 857         str[count] = 0;
 858         level = simple_strtoul(str, NULL, 0);
 859
 860         if (level > 100)
 861                 return -EFAULT;
 862
 863         /* validate though the list of available levels */
 864         for (i = 0; i < dev->brightness->count; i++)
 865                 if (level == dev->brightness->levels[i]) {
 866                         if (ACPI_SUCCESS
 867                             (acpi_video_device_lcd_set_level(dev, level)))
 868                                 dev->brightness->curr = level;
 869                         break;
 870                 }
 871
 872         return count;
 873 }
 874
 875 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 876 {
 877         struct acpi_video_device *dev = seq->private;
 878         int status;
 879         int i;
 880         union acpi_object *edid = NULL;
 881
 882
 883         if (!dev)
 884                 goto out;
 885
 886         status = acpi_video_device_EDID(dev, &edid, 128);
 887         if (ACPI_FAILURE(status)) {
 888                 status = acpi_video_device_EDID(dev, &edid, 256);
 889         }
 890
 891         if (ACPI_FAILURE(status)) {
 892                 goto out;
 893         }
 894
 895         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 896                 for (i = 0; i < edid->buffer.length; i++)
 897                         seq_putc(seq, edid->buffer.pointer[i]);
 898         }
 899
 900       out:
 901         if (!edid)
 902                 seq_printf(seq, "<not supported>\n");
 903         else
 904                 kfree(edid);
 905
 906         return 0;
 907 }
 908
 909 static int
 910 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 911 {
 912         return single_open(file, acpi_video_device_EDID_seq_show,
 913                            PDE(inode)->data);
 914 }
 915
 916 static int acpi_video_device_add_fs(struct acpi_device *device)
 917 {
 918         struct proc_dir_entry *entry = NULL;
 919         struct acpi_video_device *vid_dev;
 920
 921
 922         if (!device)
 923                 return -ENODEV;
 924
 925         vid_dev = acpi_driver_data(device);
 926         if (!vid_dev)
 927                 return -ENODEV;
 928
 929         if (!acpi_device_dir(device)) {
 930                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 931                                                      vid_dev->video->dir);
 932                 if (!acpi_device_dir(device))
 933                         return -ENODEV;
 934                 acpi_device_dir(device)->owner = THIS_MODULE;
 935         }
 936
 937         /* 'info' [R] */
 938         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 939         if (!entry)
 940                 return -ENODEV;
 941         else {
 942                 entry->proc_fops = &acpi_video_device_info_fops;
 943                 entry->data = acpi_driver_data(device);
 944                 entry->owner = THIS_MODULE;
 945         }
 946
 947         /* 'state' [R/W] */
 948         entry =
 949             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 950                               acpi_device_dir(device));
 951         if (!entry)
 952                 return -ENODEV;
 953         else {
 954                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 955                 entry->proc_fops = &acpi_video_device_state_fops;
 956                 entry->data = acpi_driver_data(device);
 957                 entry->owner = THIS_MODULE;
 958         }
 959
 960         /* 'brightness' [R/W] */
 961         entry =
 962             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 963                               acpi_device_dir(device));
 964         if (!entry)
 965                 return -ENODEV;
 966         else {
 967                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 968                 entry->proc_fops = &acpi_video_device_brightness_fops;
 969                 entry->data = acpi_driver_data(device);
 970                 entry->owner = THIS_MODULE;
 971         }
 972
 973         /* 'EDID' [R] */
 974         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 975         if (!entry)
 976                 return -ENODEV;
 977         else {
 978                 entry->proc_fops = &acpi_video_device_EDID_fops;
 979                 entry->data = acpi_driver_data(device);
 980                 entry->owner = THIS_MODULE;
 981         }
 982
 983         return 0;
 984 }
 985
 986 static int acpi_video_device_remove_fs(struct acpi_device *device)
 987 {
 988         struct acpi_video_device *vid_dev;
 989
 990         vid_dev = acpi_driver_data(device);
 991         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 992                 return -ENODEV;
 993
 994         if (acpi_device_dir(device)) {
 995                 remove_proc_entry("info", acpi_device_dir(device));
 996                 remove_proc_entry("state", acpi_device_dir(device));
 997                 remove_proc_entry("brightness", acpi_device_dir(device));
 998                 remove_proc_entry("EDID", acpi_device_dir(device));
 999                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1000                 acpi_device_dir(device) = NULL;
1001         }
1002
1003         return 0;
1004 }
1005
1006 /* video bus */
1007 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1008 {
1009         struct acpi_video_bus *video = seq->private;
1010
1011
1012         if (!video)
1013                 goto end;
1014
1015         seq_printf(seq, "Switching heads:              %s\n",
1016                    video->flags.multihead ? "yes" : "no");
1017         seq_printf(seq, "Video ROM:                    %s\n",
1018                    video->flags.rom ? "yes" : "no");
1019         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1020                    video->flags.post ? "yes" : "no");
1021
1022       end:
1023         return 0;
1024 }
1025
1026 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1027 {
1028         return single_open(file, acpi_video_bus_info_seq_show,
1029                            PDE(inode)->data);
1030 }
1031
1032 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1033 {
1034         struct acpi_video_bus *video = seq->private;
1035
1036
1037         if (!video)
1038                 goto end;
1039
1040         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1041         seq_printf(seq, "<TODO>\n");
1042
1043       end:
1044         return 0;
1045 }
1046
1047 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1048 {
1049         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1050 }
1051
1052 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1053 {
1054         struct acpi_video_bus *video = seq->private;
1055         unsigned long options;
1056         int status;
1057
1058
1059         if (!video)
1060                 goto end;
1061
1062         status = acpi_video_bus_POST_options(video, &options);
1063         if (ACPI_SUCCESS(status)) {
1064                 if (!(options & 1)) {
1065                         printk(KERN_WARNING PREFIX
1066                                "The motherboard VGA device is not listed as a possible POST device.\n");
1067                         printk(KERN_WARNING PREFIX
1068                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1069                 }
1070                 printk("%lx\n", options);
1071                 seq_printf(seq, "can POST: <intgrated video>");
1072                 if (options & 2)
1073                         seq_printf(seq, " <PCI video>");
1074                 if (options & 4)
1075                         seq_printf(seq, " <AGP video>");
1076                 seq_putc(seq, '\n');
1077         } else
1078                 seq_printf(seq, "<not supported>\n");
1079       end:
1080         return 0;
1081 }
1082
1083 static int
1084 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1085 {
1086         return single_open(file, acpi_video_bus_POST_info_seq_show,
1087                            PDE(inode)->data);
1088 }
1089
1090 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1091 {
1092         struct acpi_video_bus *video = seq->private;
1093         int status;
1094         unsigned long id;
1095
1096
1097         if (!video)
1098                 goto end;
1099
1100         status = acpi_video_bus_get_POST(video, &id);
1101         if (!ACPI_SUCCESS(status)) {
1102                 seq_printf(seq, "<not supported>\n");
1103                 goto end;
1104         }
1105         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1106
1107       end:
1108         return 0;
1109 }
1110
1111 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1112 {
1113         struct acpi_video_bus *video = seq->private;
1114
1115
1116         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1117
1118         return 0;
1119 }
1120
1121 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1122 {
1123         return single_open(file, acpi_video_bus_POST_seq_show,
1124                            PDE(inode)->data);
1125 }
1126
1127 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1128 {
1129         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1130 }
1131
1132 static ssize_t
1133 acpi_video_bus_write_POST(struct file *file,
1134                           const char __user * buffer,
1135                           size_t count, loff_t * data)
1136 {
1137         int status;
1138         struct seq_file *m = file->private_data;
1139         struct acpi_video_bus *video = m->private;
1140         char str[12] = { 0 };
1141         unsigned long opt, options;
1142
1143
1144         if (!video || count + 1 > sizeof str)
1145                 return -EINVAL;
1146
1147         status = acpi_video_bus_POST_options(video, &options);
1148         if (!ACPI_SUCCESS(status))
1149                 return -EINVAL;
1150
1151         if (copy_from_user(str, buffer, count))
1152                 return -EFAULT;
1153
1154         str[count] = 0;
1155         opt = strtoul(str, NULL, 0);
1156         if (opt > 3)
1157                 return -EFAULT;
1158
1159         /* just in case an OEM 'forget' the motherboard... */
1160         options |= 1;
1161
1162         if (options & (1ul << opt)) {
1163                 status = acpi_video_bus_set_POST(video, opt);
1164                 if (!ACPI_SUCCESS(status))
1165                         return -EFAULT;
1166
1167         }
1168
1169         return count;
1170 }
1171
1172 static ssize_t
1173 acpi_video_bus_write_DOS(struct file *file,
1174                          const char __user * buffer,
1175                          size_t count, loff_t * data)
1176 {
1177         int status;
1178         struct seq_file *m = file->private_data;
1179         struct acpi_video_bus *video = m->private;
1180         char str[12] = { 0 };
1181         unsigned long opt;
1182
1183
1184         if (!video || count + 1 > sizeof str)
1185                 return -EINVAL;
1186
1187         if (copy_from_user(str, buffer, count))
1188                 return -EFAULT;
1189
1190         str[count] = 0;
1191         opt = strtoul(str, NULL, 0);
1192         if (opt > 7)
1193                 return -EFAULT;
1194
1195         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1196
1197         if (!ACPI_SUCCESS(status))
1198                 return -EFAULT;
1199
1200         return count;
1201 }
1202
1203 static int acpi_video_bus_add_fs(struct acpi_device *device)
1204 {
1205         struct proc_dir_entry *entry = NULL;
1206         struct acpi_video_bus *video;
1207
1208
1209         video = acpi_driver_data(device);
1210
1211         if (!acpi_device_dir(device)) {
1212                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1213                                                      acpi_video_dir);
1214                 if (!acpi_device_dir(device))
1215                         return -ENODEV;
1216                 video->dir = acpi_device_dir(device);
1217                 acpi_device_dir(device)->owner = THIS_MODULE;
1218         }
1219
1220         /* 'info' [R] */
1221         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1222         if (!entry)
1223                 return -ENODEV;
1224         else {
1225                 entry->proc_fops = &acpi_video_bus_info_fops;
1226                 entry->data = acpi_driver_data(device);
1227                 entry->owner = THIS_MODULE;
1228         }
1229
1230         /* 'ROM' [R] */
1231         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1232         if (!entry)
1233                 return -ENODEV;
1234         else {
1235                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1236                 entry->data = acpi_driver_data(device);
1237                 entry->owner = THIS_MODULE;
1238         }
1239
1240         /* 'POST_info' [R] */
1241         entry =
1242             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1243         if (!entry)
1244                 return -ENODEV;
1245         else {
1246                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1247                 entry->data = acpi_driver_data(device);
1248                 entry->owner = THIS_MODULE;
1249         }
1250
1251         /* 'POST' [R/W] */
1252         entry =
1253             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1254                               acpi_device_dir(device));
1255         if (!entry)
1256                 return -ENODEV;
1257         else {
1258                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1259                 entry->proc_fops = &acpi_video_bus_POST_fops;
1260                 entry->data = acpi_driver_data(device);
1261                 entry->owner = THIS_MODULE;
1262         }
1263
1264         /* 'DOS' [R/W] */
1265         entry =
1266             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1267                               acpi_device_dir(device));
1268         if (!entry)
1269                 return -ENODEV;
1270         else {
1271                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1272                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1273                 entry->data = acpi_driver_data(device);
1274                 entry->owner = THIS_MODULE;
1275         }
1276
1277         return 0;
1278 }
1279
1280 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1281 {
1282         struct acpi_video_bus *video;
1283
1284
1285         video = acpi_driver_data(device);
1286
1287         if (acpi_device_dir(device)) {
1288                 remove_proc_entry("info", acpi_device_dir(device));
1289                 remove_proc_entry("ROM", acpi_device_dir(device));
1290                 remove_proc_entry("POST_info", acpi_device_dir(device));
1291                 remove_proc_entry("POST", acpi_device_dir(device));
1292                 remove_proc_entry("DOS", acpi_device_dir(device));
1293                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1294                 acpi_device_dir(device) = NULL;
1295         }
1296
1297         return 0;
1298 }
1299
1300 /* --------------------------------------------------------------------------
1301                                  Driver Interface
1302    -------------------------------------------------------------------------- */
1303
1304 /* device interface */
1305 static struct acpi_video_device_attrib*
1306 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1307 {
1308         int count;
1309
1310         for(count = 0; count < video->attached_count; count++)
1311                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1312                         return &(video->attached_array[count].value.attrib);
1313         return NULL;
1314 }
1315
1316 static int
1317 acpi_video_bus_get_one_device(struct acpi_device *device,
1318                               struct acpi_video_bus *video)
1319 {
1320         unsigned long device_id;
1321         int status;
1322         struct acpi_video_device *data;
1323         struct acpi_video_device_attrib* attribute;
1324
1325         if (!device || !video)
1326                 return -EINVAL;
1327
1328         status =
1329             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1330         if (ACPI_SUCCESS(status)) {
1331
1332                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1333                 if (!data)
1334                         return -ENOMEM;
1335
1336                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1337                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1338                 acpi_driver_data(device) = data;
1339
1340                 data->device_id = device_id;
1341                 data->video = video;
1342                 data->dev = device;
1343
1344                 attribute = acpi_video_get_device_attr(video, device_id);
1345
1346                 if((attribute != NULL) && attribute->device_id_scheme) {
1347                         switch (attribute->display_type) {
1348                         case ACPI_VIDEO_DISPLAY_CRT:
1349                                 data->flags.crt = 1;
1350                                 break;
1351                         case ACPI_VIDEO_DISPLAY_TV:
1352                                 data->flags.tvout = 1;
1353                                 break;
1354                         case ACPI_VIDEO_DISPLAY_DVI:
1355                                 data->flags.dvi = 1;
1356                                 break;
1357                         case ACPI_VIDEO_DISPLAY_LCD:
1358                                 data->flags.lcd = 1;
1359                                 break;
1360                         default:
1361                                 data->flags.unknown = 1;
1362                                 break;
1363                         }
1364                         if(attribute->bios_can_detect)
1365                                 data->flags.bios = 1;
1366                 } else
1367                         data->flags.unknown = 1;
1368
1369                 acpi_video_device_bind(video, data);
1370                 acpi_video_device_find_cap(data);
1371
1372                 status = acpi_install_notify_handler(device->handle,
1373                                                      ACPI_DEVICE_NOTIFY,
1374                                                      acpi_video_device_notify,
1375                                                      data);
1376                 if (ACPI_FAILURE(status)) {
1377                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1378                                           "Error installing notify handler\n"));
1379                         if(data->brightness)
1380                                 kfree(data->brightness->levels);
1381                         kfree(data->brightness);
1382                         kfree(data);
1383                         return -ENODEV;
1384                 }
1385
1386                 down(&video->sem);
1387                 list_add_tail(&data->entry, &video->video_device_list);
1388                 up(&video->sem);
1389
1390                 acpi_video_device_add_fs(device);
1391
1392                 return 0;
1393         }
1394
1395         return -ENOENT;
1396 }
1397
1398 /*
1399  *  Arg:
1400  *      video   : video bus device
1401  *
1402  *  Return:
1403  *      none
1404  *
1405  *  Enumerate the video device list of the video bus,
1406  *  bind the ids with the corresponding video devices
1407  *  under the video bus.
1408  */
1409
1410 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1411 {
1412         struct list_head *node, *next;
1413         list_for_each_safe(node, next, &video->video_device_list) {
1414                 struct acpi_video_device *dev =
1415                     container_of(node, struct acpi_video_device, entry);
1416                 acpi_video_device_bind(video, dev);
1417         }
1418 }
1419
1420 /*
1421  *  Arg:
1422  *      video   : video bus device
1423  *      device  : video output device under the video
1424  *              bus
1425  *
1426  *  Return:
1427  *      none
1428  *
1429  *  Bind the ids with the corresponding video devices
1430  *  under the video bus.
1431  */
1432
1433 static void
1434 acpi_video_device_bind(struct acpi_video_bus *video,
1435                        struct acpi_video_device *device)
1436 {
1437         int i;
1438
1439 #define IDS_VAL(i) video->attached_array[i].value.int_val
1440 #define IDS_BIND(i) video->attached_array[i].bind_info
1441
1442         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1443              i < video->attached_count; i++) {
1444                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1445                         IDS_BIND(i) = device;
1446                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1447                 }
1448         }
1449 #undef IDS_VAL
1450 #undef IDS_BIND
1451 }
1452
1453 /*
1454  *  Arg:
1455  *      video   : video bus device
1456  *
1457  *  Return:
1458  *      < 0     : error
1459  *
1460  *  Call _DOD to enumerate all devices attached to display adapter
1461  *
1462  */
1463
1464 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1465 {
1466         int status;
1467         int count;
1468         int i;
1469         struct acpi_video_enumerated_device *active_device_list;
1470         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1471         union acpi_object *dod = NULL;
1472         union acpi_object *obj;
1473
1474         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1475         if (!ACPI_SUCCESS(status)) {
1476                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1477                 return status;
1478         }
1479
1480         dod = buffer.pointer;
1481         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1482                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1483                 status = -EFAULT;
1484                 goto out;
1485         }
1486
1487         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1488                           dod->package.count));
1489
1490         active_device_list = kmalloc((1 +
1491                                       dod->package.count) *
1492                                      sizeof(struct
1493                                             acpi_video_enumerated_device),
1494                                      GFP_KERNEL);
1495
1496         if (!active_device_list) {
1497                 status = -ENOMEM;
1498                 goto out;
1499         }
1500
1501         count = 0;
1502         for (i = 0; i < dod->package.count; i++) {
1503                 obj = &dod->package.elements[i];
1504
1505                 if (obj->type != ACPI_TYPE_INTEGER) {
1506                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1507                         active_device_list[i].value.int_val =
1508                             ACPI_VIDEO_HEAD_INVALID;
1509                 }
1510                 active_device_list[i].value.int_val = obj->integer.value;
1511                 active_device_list[i].bind_info = NULL;
1512                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1513                                   (int)obj->integer.value));
1514                 count++;
1515         }
1516         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1517
1518         kfree(video->attached_array);
1519
1520         video->attached_array = active_device_list;
1521         video->attached_count = count;
1522       out:
1523         kfree(buffer.pointer);
1524         return status;
1525 }
1526
1527 /*
1528  *  Arg:
1529  *      video   : video bus device
1530  *      event   : Nontify Event
1531  *
1532  *  Return:
1533  *      < 0     : error
1534  *
1535  *      1. Find out the current active output device.
1536  *      2. Identify the next output device to switch
1537  *      3. call _DSS to do actual switch.
1538  */
1539
1540 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1541 {
1542         struct list_head *node, *next;
1543         struct acpi_video_device *dev = NULL;
1544         struct acpi_video_device *dev_next = NULL;
1545         struct acpi_video_device *dev_prev = NULL;
1546         unsigned long state;
1547         int status = 0;
1548
1549
1550         list_for_each_safe(node, next, &video->video_device_list) {
1551                 dev = container_of(node, struct acpi_video_device, entry);
1552                 status = acpi_video_device_get_state(dev, &state);
1553                 if (state & 0x2) {
1554                         dev_next =
1555                             container_of(node->next, struct acpi_video_device,
1556                                          entry);
1557                         dev_prev =
1558                             container_of(node->prev, struct acpi_video_device,
1559                                          entry);
1560                         goto out;
1561                 }
1562         }
1563         dev_next = container_of(node->next, struct acpi_video_device, entry);
1564         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1565       out:
1566         switch (event) {
1567         case ACPI_VIDEO_NOTIFY_CYCLE:
1568         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1569                 acpi_video_device_set_state(dev, 0);
1570                 acpi_video_device_set_state(dev_next, 0x80000001);
1571                 break;
1572         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1573                 acpi_video_device_set_state(dev, 0);
1574                 acpi_video_device_set_state(dev_prev, 0x80000001);
1575         default:
1576                 break;
1577         }
1578
1579         return status;
1580 }
1581
1582 static int
1583 acpi_video_get_next_level(struct acpi_video_device *device,
1584                           u32 level_current, u32 event)
1585 {
1586         int min, max, min_above, max_below, i, l;
1587         max = max_below = 0;
1588         min = min_above = 255;
1589         for (i = 0; i < device->brightness->count; i++) {
1590                 l = device->brightness->levels[i];
1591                 if (l < min)
1592                         min = l;
1593                 if (l > max)
1594                         max = l;
1595                 if (l < min_above && l > level_current)
1596                         min_above = l;
1597                 if (l > max_below && l < level_current)
1598                         max_below = l;
1599         }
1600
1601         switch (event) {
1602         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1603                 return (level_current < max) ? min_above : min;
1604         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1605                 return (level_current < max) ? min_above : max;
1606         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1607                 return (level_current > min) ? max_below : min;
1608         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1609         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1610                 return 0;
1611         default:
1612                 return level_current;
1613         }
1614 }
1615
1616 static void
1617 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1618 {
1619         unsigned long level_current, level_next;
1620         acpi_video_device_lcd_get_level_current(device, &level_current);
1621         level_next = acpi_video_get_next_level(device, level_current, event);
1622         acpi_video_device_lcd_set_level(device, level_next);
1623 }
1624
1625 static int
1626 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1627                            struct acpi_device *device)
1628 {
1629         int status = 0;
1630         struct list_head *node, *next;
1631
1632
1633         acpi_video_device_enumerate(video);
1634
1635         list_for_each_safe(node, next, &device->children) {
1636                 struct acpi_device *dev =
1637                     list_entry(node, struct acpi_device, node);
1638
1639                 if (!dev)
1640                         continue;
1641
1642                 status = acpi_video_bus_get_one_device(dev, video);
1643                 if (ACPI_FAILURE(status)) {
1644                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1645                         continue;
1646                 }
1647
1648         }
1649         return status;
1650 }
1651
1652 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1653 {
1654         acpi_status status;
1655         struct acpi_video_bus *video;
1656
1657
1658         if (!device || !device->video)
1659                 return -ENOENT;
1660
1661         video = device->video;
1662
1663         down(&video->sem);
1664         list_del(&device->entry);
1665         up(&video->sem);
1666         acpi_video_device_remove_fs(device->dev);
1667
1668         status = acpi_remove_notify_handler(device->dev->handle,
1669                                             ACPI_DEVICE_NOTIFY,
1670                                             acpi_video_device_notify);
1671         backlight_device_unregister(device->backlight);
1672         return 0;
1673 }
1674
1675 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1676 {
1677         int status;
1678         struct list_head *node, *next;
1679
1680
1681         list_for_each_safe(node, next, &video->video_device_list) {
1682                 struct acpi_video_device *data =
1683                     list_entry(node, struct acpi_video_device, entry);
1684                 if (!data)
1685                         continue;
1686
1687                 status = acpi_video_bus_put_one_device(data);
1688                 if (ACPI_FAILURE(status))
1689                         printk(KERN_WARNING PREFIX
1690                                "hhuuhhuu bug in acpi video driver.\n");
1691
1692                 if (data->brightness)
1693                         kfree(data->brightness->levels);
1694                 kfree(data->brightness);
1695                 kfree(data);
1696         }
1697
1698         return 0;
1699 }
1700
1701 /* acpi_video interface */
1702
1703 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1704 {
1705         return acpi_video_bus_DOS(video, 1, 0);
1706 }
1707
1708 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1709 {
1710         return acpi_video_bus_DOS(video, 0, 1);
1711 }
1712
1713 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1714 {
1715         struct acpi_video_bus *video = data;
1716         struct acpi_device *device = NULL;
1717
1718         printk("video bus notify\n");
1719
1720         if (!video)
1721                 return;
1722
1723         device = video->device;
1724
1725         switch (event) {
1726         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1727                                          * most likely via hotkey. */
1728                 acpi_bus_generate_event(device, event, 0);
1729                 break;
1730
1731         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1732                                          * connector. */
1733                 acpi_video_device_enumerate(video);
1734                 acpi_video_device_rebind(video);
1735                 acpi_video_switch_output(video, event);
1736                 acpi_bus_generate_event(device, event, 0);
1737                 break;
1738
1739         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1740         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1741         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1742                 acpi_video_switch_output(video, event);
1743                 acpi_bus_generate_event(device, event, 0);
1744                 break;
1745
1746         default:
1747                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1748                                   "Unsupported event [0x%x]\n", event));
1749                 break;
1750         }
1751
1752         return;
1753 }
1754
1755 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1756 {
1757         struct acpi_video_device *video_device = data;
1758         struct acpi_device *device = NULL;
1759
1760         if (!video_device)
1761                 return;
1762
1763         device = video_device->dev;
1764
1765         switch (event) {
1766         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1767         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1768                 acpi_bus_generate_event(device, event, 0);
1769                 break;
1770         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1771         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1772         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1773         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1774         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1775                 acpi_video_switch_brightness(video_device, event);
1776                 acpi_bus_generate_event(device, event, 0);
1777                 break;
1778         default:
1779                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1780                                   "Unsupported event [0x%x]\n", event));
1781                 break;
1782         }
1783         return;
1784 }
1785
1786 static int acpi_video_bus_add(struct acpi_device *device)
1787 {
1788         int result = 0;
1789         acpi_status status = 0;
1790         struct acpi_video_bus *video = NULL;
1791
1792
1793         if (!device)
1794                 return -EINVAL;
1795
1796         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1797         if (!video)
1798                 return -ENOMEM;
1799
1800         video->device = device;
1801         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1802         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1803         acpi_driver_data(device) = video;
1804
1805         acpi_video_bus_find_cap(video);
1806         result = acpi_video_bus_check(video);
1807         if (result)
1808                 goto end;
1809
1810         result = acpi_video_bus_add_fs(device);
1811         if (result)
1812                 goto end;
1813
1814         init_MUTEX(&video->sem);
1815         INIT_LIST_HEAD(&video->video_device_list);
1816
1817         acpi_video_bus_get_devices(video, device);
1818         acpi_video_bus_start_devices(video);
1819
1820         status = acpi_install_notify_handler(device->handle,
1821                                              ACPI_DEVICE_NOTIFY,
1822                                              acpi_video_bus_notify, video);
1823         if (ACPI_FAILURE(status)) {
1824                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1825                                   "Error installing notify handler\n"));
1826                 acpi_video_bus_stop_devices(video);
1827                 acpi_video_bus_put_devices(video);
1828                 kfree(video->attached_array);
1829                 acpi_video_bus_remove_fs(device);
1830                 result = -ENODEV;
1831                 goto end;
1832         }
1833
1834         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1835                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1836                video->flags.multihead ? "yes" : "no",
1837                video->flags.rom ? "yes" : "no",
1838                video->flags.post ? "yes" : "no");
1839
1840       end:
1841         if (result)
1842                 kfree(video);
1843
1844         return result;
1845 }
1846
1847 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1848 {
1849         acpi_status status = 0;
1850         struct acpi_video_bus *video = NULL;
1851
1852
1853         if (!device || !acpi_driver_data(device))
1854                 return -EINVAL;
1855
1856         video = acpi_driver_data(device);
1857
1858         acpi_video_bus_stop_devices(video);
1859
1860         status = acpi_remove_notify_handler(video->device->handle,
1861                                             ACPI_DEVICE_NOTIFY,
1862                                             acpi_video_bus_notify);
1863
1864         acpi_video_bus_put_devices(video);
1865         acpi_video_bus_remove_fs(device);
1866
1867         kfree(video->attached_array);
1868         kfree(video);
1869
1870         return 0;
1871 }
1872
1873 static int __init acpi_video_init(void)
1874 {
1875         int result = 0;
1876
1877
1878         /*
1879            acpi_dbg_level = 0xFFFFFFFF;
1880            acpi_dbg_layer = 0x08000000;
1881          */
1882
1883         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1884         if (!acpi_video_dir)
1885                 return -ENODEV;
1886         acpi_video_dir->owner = THIS_MODULE;
1887
1888         result = acpi_bus_register_driver(&acpi_video_bus);
1889         if (result < 0) {
1890                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1891                 return -ENODEV;
1892         }
1893
1894         return 0;
1895 }
1896
1897 static void __exit acpi_video_exit(void)
1898 {
1899
1900         acpi_bus_unregister_driver(&acpi_video_bus);
1901
1902         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1903
1904         return;
1905 }
1906
1907 module_init(acpi_video_init);
1908 module_exit(acpi_video_exit);