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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         struct backlight_properties *data;
 173 };
 174
 175 /* bus */
 176 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 177 static struct file_operations acpi_video_bus_info_fops = {
 178         .open = acpi_video_bus_info_open_fs,
 179         .read = seq_read,
 180         .llseek = seq_lseek,
 181         .release = single_release,
 182 };
 183
 184 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 185 static struct file_operations acpi_video_bus_ROM_fops = {
 186         .open = acpi_video_bus_ROM_open_fs,
 187         .read = seq_read,
 188         .llseek = seq_lseek,
 189         .release = single_release,
 190 };
 191
 192 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 193                                             struct file *file);
 194 static struct file_operations acpi_video_bus_POST_info_fops = {
 195         .open = acpi_video_bus_POST_info_open_fs,
 196         .read = seq_read,
 197         .llseek = seq_lseek,
 198         .release = single_release,
 199 };
 200
 201 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 202 static struct file_operations acpi_video_bus_POST_fops = {
 203         .open = acpi_video_bus_POST_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 210 static struct file_operations acpi_video_bus_DOS_fops = {
 211         .open = acpi_video_bus_DOS_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 /* device */
 218 static int acpi_video_device_info_open_fs(struct inode *inode,
 219                                           struct file *file);
 220 static struct file_operations acpi_video_device_info_fops = {
 221         .open = acpi_video_device_info_open_fs,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = single_release,
 225 };
 226
 227 static int acpi_video_device_state_open_fs(struct inode *inode,
 228                                            struct file *file);
 229 static struct file_operations acpi_video_device_state_fops = {
 230         .open = acpi_video_device_state_open_fs,
 231         .read = seq_read,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 237                                                 struct file *file);
 238 static struct file_operations acpi_video_device_brightness_fops = {
 239         .open = acpi_video_device_brightness_open_fs,
 240         .read = seq_read,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 246                                           struct file *file);
 247 static struct file_operations acpi_video_device_EDID_fops = {
 248         .open = acpi_video_device_EDID_open_fs,
 249         .read = seq_read,
 250         .llseek = seq_lseek,
 251         .release = single_release,
 252 };
 253
 254 static char device_decode[][30] = {
 255         "motherboard VGA device",
 256         "PCI VGA device",
 257         "AGP VGA device",
 258         "UNKNOWN",
 259 };
 260
 261 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 262 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 263 static void acpi_video_device_bind(struct acpi_video_bus *video,
 264                                    struct acpi_video_device *device);
 265 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 266 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 267 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 268                         int level);
 269 static int acpi_video_device_lcd_get_level_current(
 270                         struct acpi_video_device *device,
 271                         unsigned long *level);
 272 static int acpi_video_get_next_level(struct acpi_video_device *device,
 273                                      u32 level_current, u32 event);
 274 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 275                                          int event);
 276
 277 /*backlight device sysfs support*/
 278 static int acpi_video_get_brightness(struct backlight_device *bd)
 279 {
 280         unsigned long cur_level;
 281         struct acpi_video_device *vd =
 282                 (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
 283         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 284         return (int) cur_level;
 285 }
 286
 287 static int acpi_video_set_brightness(struct backlight_device *bd)
 288 {
 289         int request_level = bd->props->brightness;
 290         struct acpi_video_device *vd =
 291                 (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
 292         acpi_video_device_lcd_set_level(vd, request_level);
 293         return 0;
 294 }
 295
 296 /* --------------------------------------------------------------------------
 297                                Video Management
 298    -------------------------------------------------------------------------- */
 299
 300 /* device */
 301
 302 static int
 303 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 304 {
 305         int status;
 306
 307         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 308
 309         return status;
 310 }
 311
 312 static int
 313 acpi_video_device_get_state(struct acpi_video_device *device,
 314                             unsigned long *state)
 315 {
 316         int status;
 317
 318         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 319
 320         return status;
 321 }
 322
 323 static int
 324 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 325 {
 326         int status;
 327         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 328         struct acpi_object_list args = { 1, &arg0 };
 329         unsigned long ret;
 330
 331
 332         arg0.integer.value = state;
 333         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 334
 335         return status;
 336 }
 337
 338 static int
 339 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 340                                    union acpi_object **levels)
 341 {
 342         int status;
 343         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 344         union acpi_object *obj;
 345
 346
 347         *levels = NULL;
 348
 349         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 350         if (!ACPI_SUCCESS(status))
 351                 return status;
 352         obj = (union acpi_object *)buffer.pointer;
 353         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 354                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 355                 status = -EFAULT;
 356                 goto err;
 357         }
 358
 359         *levels = obj;
 360
 361         return 0;
 362
 363       err:
 364         kfree(buffer.pointer);
 365
 366         return status;
 367 }
 368
 369 static int
 370 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 371 {
 372         int status;
 373         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 374         struct acpi_object_list args = { 1, &arg0 };
 375
 376
 377         arg0.integer.value = level;
 378         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 379
 380         printk(KERN_DEBUG "set_level status: %x\n", status);
 381         return status;
 382 }
 383
 384 static int
 385 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 386                                         unsigned long *level)
 387 {
 388         int status;
 389
 390         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
 391
 392         return status;
 393 }
 394
 395 static int
 396 acpi_video_device_EDID(struct acpi_video_device *device,
 397                        union acpi_object **edid, ssize_t length)
 398 {
 399         int status;
 400         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 401         union acpi_object *obj;
 402         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 403         struct acpi_object_list args = { 1, &arg0 };
 404
 405
 406         *edid = NULL;
 407
 408         if (!device)
 409                 return -ENODEV;
 410         if (length == 128)
 411                 arg0.integer.value = 1;
 412         else if (length == 256)
 413                 arg0.integer.value = 2;
 414         else
 415                 return -EINVAL;
 416
 417         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 418         if (ACPI_FAILURE(status))
 419                 return -ENODEV;
 420
 421         obj = buffer.pointer;
 422
 423         if (obj && obj->type == ACPI_TYPE_BUFFER)
 424                 *edid = obj;
 425         else {
 426                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 427                 status = -EFAULT;
 428                 kfree(obj);
 429         }
 430
 431         return status;
 432 }
 433
 434 /* bus */
 435
 436 static int
 437 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 438 {
 439         int status;
 440         unsigned long tmp;
 441         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 442         struct acpi_object_list args = { 1, &arg0 };
 443
 444
 445         arg0.integer.value = option;
 446
 447         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 448         if (ACPI_SUCCESS(status))
 449                 status = tmp ? (-EINVAL) : (AE_OK);
 450
 451         return status;
 452 }
 453
 454 static int
 455 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 456 {
 457         int status;
 458
 459         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 460
 461         return status;
 462 }
 463
 464 static int
 465 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 466                             unsigned long *options)
 467 {
 468         int status;
 469
 470         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 471         *options &= 3;
 472
 473         return status;
 474 }
 475
 476 /*
 477  *  Arg:
 478  *      video           : video bus device pointer
 479  *      bios_flag       :
 480  *              0.      The system BIOS should NOT automatically switch(toggle)
 481  *                      the active display output.
 482  *              1.      The system BIOS should automatically switch (toggle) the
 483  *                      active display output. No swich event.
 484  *              2.      The _DGS value should be locked.
 485  *              3.      The system BIOS should not automatically switch (toggle) the
 486  *                      active display output, but instead generate the display switch
 487  *                      event notify code.
 488  *      lcd_flag        :
 489  *              0.      The system BIOS should automatically control the brightness level
 490  *                      of the LCD, when the power changes from AC to DC
 491  *              1.      The system BIOS should NOT automatically control the brightness
 492  *                      level of the LCD, when the power changes from AC to DC.
 493  * Return Value:
 494  *              -1      wrong arg.
 495  */
 496
 497 static int
 498 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 499 {
 500         acpi_integer status = 0;
 501         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 502         struct acpi_object_list args = { 1, &arg0 };
 503
 504
 505         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 506                 status = -1;
 507                 goto Failed;
 508         }
 509         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 510         video->dos_setting = arg0.integer.value;
 511         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 512
 513       Failed:
 514         return status;
 515 }
 516
 517 /*
 518  *  Arg:
 519  *      device  : video output device (LCD, CRT, ..)
 520  *
 521  *  Return Value:
 522  *      None
 523  *
 524  *  Find out all required AML method defined under the output
 525  *  device.
 526  */
 527
 528 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 529 {
 530         acpi_integer status;
 531         acpi_handle h_dummy1;
 532         int i;
 533         u32 max_level = 0;
 534         union acpi_object *obj = NULL;
 535         struct acpi_video_device_brightness *br = NULL;
 536
 537
 538         memset(&device->cap, 0, 4);
 539
 540         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 541                 device->cap._ADR = 1;
 542         }
 543         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 544                 device->cap._BCL = 1;
 545         }
 546         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 547                 device->cap._BCM = 1;
 548         }
 549         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 550                 device->cap._BQC = 1;
 551         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 552                 device->cap._DDC = 1;
 553         }
 554         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 555                 device->cap._DCS = 1;
 556         }
 557         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 558                 device->cap._DGS = 1;
 559         }
 560         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 561                 device->cap._DSS = 1;
 562         }
 563
 564         status = acpi_video_device_lcd_query_levels(device, &obj);
 565
 566         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 567                 int count = 0;
 568                 union acpi_object *o;
 569
 570                 br = kzalloc(sizeof(*br), GFP_KERNEL);
 571                 if (!br) {
 572                         printk(KERN_ERR "can't allocate memory\n");
 573                 } else {
 574                         br->levels = kmalloc(obj->package.count *
 575                                              sizeof *(br->levels), GFP_KERNEL);
 576                         if (!br->levels)
 577                                 goto out;
 578
 579                         for (i = 0; i < obj->package.count; i++) {
 580                                 o = (union acpi_object *)&obj->package.
 581                                     elements[i];
 582                                 if (o->type != ACPI_TYPE_INTEGER) {
 583                                         printk(KERN_ERR PREFIX "Invalid data\n");
 584                                         continue;
 585                                 }
 586                                 br->levels[count] = (u32) o->integer.value;
 587                                 if (br->levels[count] > max_level)
 588                                         max_level = br->levels[count];
 589                                 count++;
 590                         }
 591                       out:
 592                         if (count < 2) {
 593                                 kfree(br->levels);
 594                                 kfree(br);
 595                         } else {
 596                                 br->count = count;
 597                                 device->brightness = br;
 598                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 599                                                   "found %d brightness levels\n",
 600                                                   count));
 601                         }
 602                 }
 603         }
 604
 605         kfree(obj);
 606
 607         if (device->cap._BCL && device->cap._BCM && device->cap._BQC){
 608                 unsigned long tmp;
 609                 static int count = 0;
 610                 char *name;
 611                 struct backlight_properties *acpi_video_data;
 612
 613                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 614                 if (!name)
 615                         return;
 616
 617                 acpi_video_data = kzalloc(
 618                         sizeof(struct backlight_properties),
 619                         GFP_KERNEL);
 620                 if (!acpi_video_data){
 621                         kfree(name);
 622                         return;
 623                 }
 624                 acpi_video_data->owner = THIS_MODULE;
 625                 acpi_video_data->get_brightness =
 626                         acpi_video_get_brightness;
 627                 acpi_video_data->update_status =
 628                         acpi_video_set_brightness;
 629                 sprintf(name, "acpi_video%d", count++);
 630                 device->data = acpi_video_data;
 631                 acpi_video_data->max_brightness = max_level;
 632                 acpi_video_device_lcd_get_level_current(device, &tmp);
 633                 acpi_video_data->brightness = (int)tmp;
 634                 device->backlight = backlight_device_register(name,
 635                         NULL, device, acpi_video_data);
 636                 kfree(name);
 637         }
 638         return;
 639 }
 640
 641 /*
 642  *  Arg:
 643  *      device  : video output device (VGA)
 644  *
 645  *  Return Value:
 646  *      None
 647  *
 648  *  Find out all required AML method defined under the video bus device.
 649  */
 650
 651 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 652 {
 653         acpi_handle h_dummy1;
 654
 655         memset(&video->cap, 0, 4);
 656         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 657                 video->cap._DOS = 1;
 658         }
 659         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 660                 video->cap._DOD = 1;
 661         }
 662         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 663                 video->cap._ROM = 1;
 664         }
 665         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 666                 video->cap._GPD = 1;
 667         }
 668         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 669                 video->cap._SPD = 1;
 670         }
 671         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 672                 video->cap._VPO = 1;
 673         }
 674 }
 675
 676 /*
 677  * Check whether the video bus device has required AML method to
 678  * support the desired features
 679  */
 680
 681 static int acpi_video_bus_check(struct acpi_video_bus *video)
 682 {
 683         acpi_status status = -ENOENT;
 684
 685
 686         if (!video)
 687                 return -EINVAL;
 688
 689         /* Since there is no HID, CID and so on for VGA driver, we have
 690          * to check well known required nodes.
 691          */
 692
 693         /* Does this device able to support video switching ? */
 694         if (video->cap._DOS) {
 695                 video->flags.multihead = 1;
 696                 status = 0;
 697         }
 698
 699         /* Does this device able to retrieve a retrieve a video ROM ? */
 700         if (video->cap._ROM) {
 701                 video->flags.rom = 1;
 702                 status = 0;
 703         }
 704
 705         /* Does this device able to configure which video device to POST ? */
 706         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 707                 video->flags.post = 1;
 708                 status = 0;
 709         }
 710
 711         return status;
 712 }
 713
 714 /* --------------------------------------------------------------------------
 715                               FS Interface (/proc)
 716    -------------------------------------------------------------------------- */
 717
 718 static struct proc_dir_entry *acpi_video_dir;
 719
 720 /* video devices */
 721
 722 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 723 {
 724         struct acpi_video_device *dev = seq->private;
 725
 726
 727         if (!dev)
 728                 goto end;
 729
 730         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 731         seq_printf(seq, "type:         ");
 732         if (dev->flags.crt)
 733                 seq_printf(seq, "CRT\n");
 734         else if (dev->flags.lcd)
 735                 seq_printf(seq, "LCD\n");
 736         else if (dev->flags.tvout)
 737                 seq_printf(seq, "TVOUT\n");
 738         else if (dev->flags.dvi)
 739                 seq_printf(seq, "DVI\n");
 740         else
 741                 seq_printf(seq, "UNKNOWN\n");
 742
 743         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 744
 745       end:
 746         return 0;
 747 }
 748
 749 static int
 750 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 751 {
 752         return single_open(file, acpi_video_device_info_seq_show,
 753                            PDE(inode)->data);
 754 }
 755
 756 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 757 {
 758         int status;
 759         struct acpi_video_device *dev = seq->private;
 760         unsigned long state;
 761
 762
 763         if (!dev)
 764                 goto end;
 765
 766         status = acpi_video_device_get_state(dev, &state);
 767         seq_printf(seq, "state:     ");
 768         if (ACPI_SUCCESS(status))
 769                 seq_printf(seq, "0x%02lx\n", state);
 770         else
 771                 seq_printf(seq, "<not supported>\n");
 772
 773         status = acpi_video_device_query(dev, &state);
 774         seq_printf(seq, "query:     ");
 775         if (ACPI_SUCCESS(status))
 776                 seq_printf(seq, "0x%02lx\n", state);
 777         else
 778                 seq_printf(seq, "<not supported>\n");
 779
 780       end:
 781         return 0;
 782 }
 783
 784 static int
 785 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 786 {
 787         return single_open(file, acpi_video_device_state_seq_show,
 788                            PDE(inode)->data);
 789 }
 790
 791 static ssize_t
 792 acpi_video_device_write_state(struct file *file,
 793                               const char __user * buffer,
 794                               size_t count, loff_t * data)
 795 {
 796         int status;
 797         struct seq_file *m = file->private_data;
 798         struct acpi_video_device *dev = m->private;
 799         char str[12] = { 0 };
 800         u32 state = 0;
 801
 802
 803         if (!dev || count + 1 > sizeof str)
 804                 return -EINVAL;
 805
 806         if (copy_from_user(str, buffer, count))
 807                 return -EFAULT;
 808
 809         str[count] = 0;
 810         state = simple_strtoul(str, NULL, 0);
 811         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 812
 813         status = acpi_video_device_set_state(dev, state);
 814
 815         if (status)
 816                 return -EFAULT;
 817
 818         return count;
 819 }
 820
 821 static int
 822 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 823 {
 824         struct acpi_video_device *dev = seq->private;
 825         int i;
 826
 827
 828         if (!dev || !dev->brightness) {
 829                 seq_printf(seq, "<not supported>\n");
 830                 return 0;
 831         }
 832
 833         seq_printf(seq, "levels: ");
 834         for (i = 0; i < dev->brightness->count; i++)
 835                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 836         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 837
 838         return 0;
 839 }
 840
 841 static int
 842 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 843 {
 844         return single_open(file, acpi_video_device_brightness_seq_show,
 845                            PDE(inode)->data);
 846 }
 847
 848 static ssize_t
 849 acpi_video_device_write_brightness(struct file *file,
 850                                    const char __user * buffer,
 851                                    size_t count, loff_t * data)
 852 {
 853         struct seq_file *m = file->private_data;
 854         struct acpi_video_device *dev = m->private;
 855         char str[4] = { 0 };
 856         unsigned int level = 0;
 857         int i;
 858
 859
 860         if (!dev || !dev->brightness || count + 1 > sizeof str)
 861                 return -EINVAL;
 862
 863         if (copy_from_user(str, buffer, count))
 864                 return -EFAULT;
 865
 866         str[count] = 0;
 867         level = simple_strtoul(str, NULL, 0);
 868
 869         if (level > 100)
 870                 return -EFAULT;
 871
 872         /* validate though the list of available levels */
 873         for (i = 0; i < dev->brightness->count; i++)
 874                 if (level == dev->brightness->levels[i]) {
 875                         if (ACPI_SUCCESS
 876                             (acpi_video_device_lcd_set_level(dev, level)))
 877                                 dev->brightness->curr = level;
 878                         break;
 879                 }
 880
 881         return count;
 882 }
 883
 884 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 885 {
 886         struct acpi_video_device *dev = seq->private;
 887         int status;
 888         int i;
 889         union acpi_object *edid = NULL;
 890
 891
 892         if (!dev)
 893                 goto out;
 894
 895         status = acpi_video_device_EDID(dev, &edid, 128);
 896         if (ACPI_FAILURE(status)) {
 897                 status = acpi_video_device_EDID(dev, &edid, 256);
 898         }
 899
 900         if (ACPI_FAILURE(status)) {
 901                 goto out;
 902         }
 903
 904         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 905                 for (i = 0; i < edid->buffer.length; i++)
 906                         seq_putc(seq, edid->buffer.pointer[i]);
 907         }
 908
 909       out:
 910         if (!edid)
 911                 seq_printf(seq, "<not supported>\n");
 912         else
 913                 kfree(edid);
 914
 915         return 0;
 916 }
 917
 918 static int
 919 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 920 {
 921         return single_open(file, acpi_video_device_EDID_seq_show,
 922                            PDE(inode)->data);
 923 }
 924
 925 static int acpi_video_device_add_fs(struct acpi_device *device)
 926 {
 927         struct proc_dir_entry *entry = NULL;
 928         struct acpi_video_device *vid_dev;
 929
 930
 931         if (!device)
 932                 return -ENODEV;
 933
 934         vid_dev = acpi_driver_data(device);
 935         if (!vid_dev)
 936                 return -ENODEV;
 937
 938         if (!acpi_device_dir(device)) {
 939                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 940                                                      vid_dev->video->dir);
 941                 if (!acpi_device_dir(device))
 942                         return -ENODEV;
 943                 acpi_device_dir(device)->owner = THIS_MODULE;
 944         }
 945
 946         /* 'info' [R] */
 947         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 948         if (!entry)
 949                 return -ENODEV;
 950         else {
 951                 entry->proc_fops = &acpi_video_device_info_fops;
 952                 entry->data = acpi_driver_data(device);
 953                 entry->owner = THIS_MODULE;
 954         }
 955
 956         /* 'state' [R/W] */
 957         entry =
 958             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 959                               acpi_device_dir(device));
 960         if (!entry)
 961                 return -ENODEV;
 962         else {
 963                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 964                 entry->proc_fops = &acpi_video_device_state_fops;
 965                 entry->data = acpi_driver_data(device);
 966                 entry->owner = THIS_MODULE;
 967         }
 968
 969         /* 'brightness' [R/W] */
 970         entry =
 971             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 972                               acpi_device_dir(device));
 973         if (!entry)
 974                 return -ENODEV;
 975         else {
 976                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 977                 entry->proc_fops = &acpi_video_device_brightness_fops;
 978                 entry->data = acpi_driver_data(device);
 979                 entry->owner = THIS_MODULE;
 980         }
 981
 982         /* 'EDID' [R] */
 983         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 984         if (!entry)
 985                 return -ENODEV;
 986         else {
 987                 entry->proc_fops = &acpi_video_device_EDID_fops;
 988                 entry->data = acpi_driver_data(device);
 989                 entry->owner = THIS_MODULE;
 990         }
 991
 992         return 0;
 993 }
 994
 995 static int acpi_video_device_remove_fs(struct acpi_device *device)
 996 {
 997         struct acpi_video_device *vid_dev;
 998
 999         vid_dev = acpi_driver_data(device);
1000         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1001                 return -ENODEV;
1002
1003         if (acpi_device_dir(device)) {
1004                 remove_proc_entry("info", acpi_device_dir(device));
1005                 remove_proc_entry("state", acpi_device_dir(device));
1006                 remove_proc_entry("brightness", acpi_device_dir(device));
1007                 remove_proc_entry("EDID", acpi_device_dir(device));
1008                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1009                 acpi_device_dir(device) = NULL;
1010         }
1011
1012         return 0;
1013 }
1014
1015 /* video bus */
1016 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1017 {
1018         struct acpi_video_bus *video = seq->private;
1019
1020
1021         if (!video)
1022                 goto end;
1023
1024         seq_printf(seq, "Switching heads:              %s\n",
1025                    video->flags.multihead ? "yes" : "no");
1026         seq_printf(seq, "Video ROM:                    %s\n",
1027                    video->flags.rom ? "yes" : "no");
1028         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1029                    video->flags.post ? "yes" : "no");
1030
1031       end:
1032         return 0;
1033 }
1034
1035 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1036 {
1037         return single_open(file, acpi_video_bus_info_seq_show,
1038                            PDE(inode)->data);
1039 }
1040
1041 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1042 {
1043         struct acpi_video_bus *video = seq->private;
1044
1045
1046         if (!video)
1047                 goto end;
1048
1049         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1050         seq_printf(seq, "<TODO>\n");
1051
1052       end:
1053         return 0;
1054 }
1055
1056 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1057 {
1058         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1059 }
1060
1061 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1062 {
1063         struct acpi_video_bus *video = seq->private;
1064         unsigned long options;
1065         int status;
1066
1067
1068         if (!video)
1069                 goto end;
1070
1071         status = acpi_video_bus_POST_options(video, &options);
1072         if (ACPI_SUCCESS(status)) {
1073                 if (!(options & 1)) {
1074                         printk(KERN_WARNING PREFIX
1075                                "The motherboard VGA device is not listed as a possible POST device.\n");
1076                         printk(KERN_WARNING PREFIX
1077                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1078                 }
1079                 printk("%lx\n", options);
1080                 seq_printf(seq, "can POST: <intgrated video>");
1081                 if (options & 2)
1082                         seq_printf(seq, " <PCI video>");
1083                 if (options & 4)
1084                         seq_printf(seq, " <AGP video>");
1085                 seq_putc(seq, '\n');
1086         } else
1087                 seq_printf(seq, "<not supported>\n");
1088       end:
1089         return 0;
1090 }
1091
1092 static int
1093 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1094 {
1095         return single_open(file, acpi_video_bus_POST_info_seq_show,
1096                            PDE(inode)->data);
1097 }
1098
1099 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1100 {
1101         struct acpi_video_bus *video = seq->private;
1102         int status;
1103         unsigned long id;
1104
1105
1106         if (!video)
1107                 goto end;
1108
1109         status = acpi_video_bus_get_POST(video, &id);
1110         if (!ACPI_SUCCESS(status)) {
1111                 seq_printf(seq, "<not supported>\n");
1112                 goto end;
1113         }
1114         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1115
1116       end:
1117         return 0;
1118 }
1119
1120 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1121 {
1122         struct acpi_video_bus *video = seq->private;
1123
1124
1125         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1126
1127         return 0;
1128 }
1129
1130 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1131 {
1132         return single_open(file, acpi_video_bus_POST_seq_show,
1133                            PDE(inode)->data);
1134 }
1135
1136 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1137 {
1138         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1139 }
1140
1141 static ssize_t
1142 acpi_video_bus_write_POST(struct file *file,
1143                           const char __user * buffer,
1144                           size_t count, loff_t * data)
1145 {
1146         int status;
1147         struct seq_file *m = file->private_data;
1148         struct acpi_video_bus *video = m->private;
1149         char str[12] = { 0 };
1150         unsigned long opt, options;
1151
1152
1153         if (!video || count + 1 > sizeof str)
1154                 return -EINVAL;
1155
1156         status = acpi_video_bus_POST_options(video, &options);
1157         if (!ACPI_SUCCESS(status))
1158                 return -EINVAL;
1159
1160         if (copy_from_user(str, buffer, count))
1161                 return -EFAULT;
1162
1163         str[count] = 0;
1164         opt = strtoul(str, NULL, 0);
1165         if (opt > 3)
1166                 return -EFAULT;
1167
1168         /* just in case an OEM 'forget' the motherboard... */
1169         options |= 1;
1170
1171         if (options & (1ul << opt)) {
1172                 status = acpi_video_bus_set_POST(video, opt);
1173                 if (!ACPI_SUCCESS(status))
1174                         return -EFAULT;
1175
1176         }
1177
1178         return count;
1179 }
1180
1181 static ssize_t
1182 acpi_video_bus_write_DOS(struct file *file,
1183                          const char __user * buffer,
1184                          size_t count, loff_t * data)
1185 {
1186         int status;
1187         struct seq_file *m = file->private_data;
1188         struct acpi_video_bus *video = m->private;
1189         char str[12] = { 0 };
1190         unsigned long opt;
1191
1192
1193         if (!video || count + 1 > sizeof str)
1194                 return -EINVAL;
1195
1196         if (copy_from_user(str, buffer, count))
1197                 return -EFAULT;
1198
1199         str[count] = 0;
1200         opt = strtoul(str, NULL, 0);
1201         if (opt > 7)
1202                 return -EFAULT;
1203
1204         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1205
1206         if (!ACPI_SUCCESS(status))
1207                 return -EFAULT;
1208
1209         return count;
1210 }
1211
1212 static int acpi_video_bus_add_fs(struct acpi_device *device)
1213 {
1214         struct proc_dir_entry *entry = NULL;
1215         struct acpi_video_bus *video;
1216
1217
1218         video = acpi_driver_data(device);
1219
1220         if (!acpi_device_dir(device)) {
1221                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1222                                                      acpi_video_dir);
1223                 if (!acpi_device_dir(device))
1224                         return -ENODEV;
1225                 video->dir = acpi_device_dir(device);
1226                 acpi_device_dir(device)->owner = THIS_MODULE;
1227         }
1228
1229         /* 'info' [R] */
1230         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1231         if (!entry)
1232                 return -ENODEV;
1233         else {
1234                 entry->proc_fops = &acpi_video_bus_info_fops;
1235                 entry->data = acpi_driver_data(device);
1236                 entry->owner = THIS_MODULE;
1237         }
1238
1239         /* 'ROM' [R] */
1240         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1241         if (!entry)
1242                 return -ENODEV;
1243         else {
1244                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1245                 entry->data = acpi_driver_data(device);
1246                 entry->owner = THIS_MODULE;
1247         }
1248
1249         /* 'POST_info' [R] */
1250         entry =
1251             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1252         if (!entry)
1253                 return -ENODEV;
1254         else {
1255                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1256                 entry->data = acpi_driver_data(device);
1257                 entry->owner = THIS_MODULE;
1258         }
1259
1260         /* 'POST' [R/W] */
1261         entry =
1262             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1263                               acpi_device_dir(device));
1264         if (!entry)
1265                 return -ENODEV;
1266         else {
1267                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1268                 entry->proc_fops = &acpi_video_bus_POST_fops;
1269                 entry->data = acpi_driver_data(device);
1270                 entry->owner = THIS_MODULE;
1271         }
1272
1273         /* 'DOS' [R/W] */
1274         entry =
1275             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1276                               acpi_device_dir(device));
1277         if (!entry)
1278                 return -ENODEV;
1279         else {
1280                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1281                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1282                 entry->data = acpi_driver_data(device);
1283                 entry->owner = THIS_MODULE;
1284         }
1285
1286         return 0;
1287 }
1288
1289 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1290 {
1291         struct acpi_video_bus *video;
1292
1293
1294         video = acpi_driver_data(device);
1295
1296         if (acpi_device_dir(device)) {
1297                 remove_proc_entry("info", acpi_device_dir(device));
1298                 remove_proc_entry("ROM", acpi_device_dir(device));
1299                 remove_proc_entry("POST_info", acpi_device_dir(device));
1300                 remove_proc_entry("POST", acpi_device_dir(device));
1301                 remove_proc_entry("DOS", acpi_device_dir(device));
1302                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1303                 acpi_device_dir(device) = NULL;
1304         }
1305
1306         return 0;
1307 }
1308
1309 /* --------------------------------------------------------------------------
1310                                  Driver Interface
1311    -------------------------------------------------------------------------- */
1312
1313 /* device interface */
1314 static struct acpi_video_device_attrib*
1315 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1316 {
1317         int count;
1318
1319         for(count = 0; count < video->attached_count; count++)
1320                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1321                         return &(video->attached_array[count].value.attrib);
1322         return NULL;
1323 }
1324
1325 static int
1326 acpi_video_bus_get_one_device(struct acpi_device *device,
1327                               struct acpi_video_bus *video)
1328 {
1329         unsigned long device_id;
1330         int status;
1331         struct acpi_video_device *data;
1332         struct acpi_video_device_attrib* attribute;
1333
1334         if (!device || !video)
1335                 return -EINVAL;
1336
1337         status =
1338             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1339         if (ACPI_SUCCESS(status)) {
1340
1341                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1342                 if (!data)
1343                         return -ENOMEM;
1344
1345                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1346                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1347                 acpi_driver_data(device) = data;
1348
1349                 data->device_id = device_id;
1350                 data->video = video;
1351                 data->dev = device;
1352
1353                 attribute = acpi_video_get_device_attr(video, device_id);
1354
1355                 if((attribute != NULL) && attribute->device_id_scheme) {
1356                         switch (attribute->display_type) {
1357                         case ACPI_VIDEO_DISPLAY_CRT:
1358                                 data->flags.crt = 1;
1359                                 break;
1360                         case ACPI_VIDEO_DISPLAY_TV:
1361                                 data->flags.tvout = 1;
1362                                 break;
1363                         case ACPI_VIDEO_DISPLAY_DVI:
1364                                 data->flags.dvi = 1;
1365                                 break;
1366                         case ACPI_VIDEO_DISPLAY_LCD:
1367                                 data->flags.lcd = 1;
1368                                 break;
1369                         default:
1370                                 data->flags.unknown = 1;
1371                                 break;
1372                         }
1373                         if(attribute->bios_can_detect)
1374                                 data->flags.bios = 1;
1375                 } else
1376                         data->flags.unknown = 1;
1377
1378                 acpi_video_device_bind(video, data);
1379                 acpi_video_device_find_cap(data);
1380
1381                 status = acpi_install_notify_handler(device->handle,
1382                                                      ACPI_DEVICE_NOTIFY,
1383                                                      acpi_video_device_notify,
1384                                                      data);
1385                 if (ACPI_FAILURE(status)) {
1386                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1387                                           "Error installing notify handler\n"));
1388                         if(data->brightness)
1389                                 kfree(data->brightness->levels);
1390                         kfree(data->brightness);
1391                         kfree(data);
1392                         return -ENODEV;
1393                 }
1394
1395                 down(&video->sem);
1396                 list_add_tail(&data->entry, &video->video_device_list);
1397                 up(&video->sem);
1398
1399                 acpi_video_device_add_fs(device);
1400
1401                 return 0;
1402         }
1403
1404         return -ENOENT;
1405 }
1406
1407 /*
1408  *  Arg:
1409  *      video   : video bus device
1410  *
1411  *  Return:
1412  *      none
1413  *
1414  *  Enumerate the video device list of the video bus,
1415  *  bind the ids with the corresponding video devices
1416  *  under the video bus.
1417  */
1418
1419 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1420 {
1421         struct list_head *node, *next;
1422         list_for_each_safe(node, next, &video->video_device_list) {
1423                 struct acpi_video_device *dev =
1424                     container_of(node, struct acpi_video_device, entry);
1425                 acpi_video_device_bind(video, dev);
1426         }
1427 }
1428
1429 /*
1430  *  Arg:
1431  *      video   : video bus device
1432  *      device  : video output device under the video
1433  *              bus
1434  *
1435  *  Return:
1436  *      none
1437  *
1438  *  Bind the ids with the corresponding video devices
1439  *  under the video bus.
1440  */
1441
1442 static void
1443 acpi_video_device_bind(struct acpi_video_bus *video,
1444                        struct acpi_video_device *device)
1445 {
1446         int i;
1447
1448 #define IDS_VAL(i) video->attached_array[i].value.int_val
1449 #define IDS_BIND(i) video->attached_array[i].bind_info
1450
1451         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1452              i < video->attached_count; i++) {
1453                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1454                         IDS_BIND(i) = device;
1455                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1456                 }
1457         }
1458 #undef IDS_VAL
1459 #undef IDS_BIND
1460 }
1461
1462 /*
1463  *  Arg:
1464  *      video   : video bus device
1465  *
1466  *  Return:
1467  *      < 0     : error
1468  *
1469  *  Call _DOD to enumerate all devices attached to display adapter
1470  *
1471  */
1472
1473 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1474 {
1475         int status;
1476         int count;
1477         int i;
1478         struct acpi_video_enumerated_device *active_device_list;
1479         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1480         union acpi_object *dod = NULL;
1481         union acpi_object *obj;
1482
1483         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1484         if (!ACPI_SUCCESS(status)) {
1485                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1486                 return status;
1487         }
1488
1489         dod = buffer.pointer;
1490         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1491                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1492                 status = -EFAULT;
1493                 goto out;
1494         }
1495
1496         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1497                           dod->package.count));
1498
1499         active_device_list = kmalloc((1 +
1500                                       dod->package.count) *
1501                                      sizeof(struct
1502                                             acpi_video_enumerated_device),
1503                                      GFP_KERNEL);
1504
1505         if (!active_device_list) {
1506                 status = -ENOMEM;
1507                 goto out;
1508         }
1509
1510         count = 0;
1511         for (i = 0; i < dod->package.count; i++) {
1512                 obj = &dod->package.elements[i];
1513
1514                 if (obj->type != ACPI_TYPE_INTEGER) {
1515                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1516                         active_device_list[i].value.int_val =
1517                             ACPI_VIDEO_HEAD_INVALID;
1518                 }
1519                 active_device_list[i].value.int_val = obj->integer.value;
1520                 active_device_list[i].bind_info = NULL;
1521                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1522                                   (int)obj->integer.value));
1523                 count++;
1524         }
1525         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1526
1527         kfree(video->attached_array);
1528
1529         video->attached_array = active_device_list;
1530         video->attached_count = count;
1531       out:
1532         kfree(buffer.pointer);
1533         return status;
1534 }
1535
1536 /*
1537  *  Arg:
1538  *      video   : video bus device
1539  *      event   : Nontify Event
1540  *
1541  *  Return:
1542  *      < 0     : error
1543  *
1544  *      1. Find out the current active output device.
1545  *      2. Identify the next output device to switch
1546  *      3. call _DSS to do actual switch.
1547  */
1548
1549 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1550 {
1551         struct list_head *node, *next;
1552         struct acpi_video_device *dev = NULL;
1553         struct acpi_video_device *dev_next = NULL;
1554         struct acpi_video_device *dev_prev = NULL;
1555         unsigned long state;
1556         int status = 0;
1557
1558
1559         list_for_each_safe(node, next, &video->video_device_list) {
1560                 dev = container_of(node, struct acpi_video_device, entry);
1561                 status = acpi_video_device_get_state(dev, &state);
1562                 if (state & 0x2) {
1563                         dev_next =
1564                             container_of(node->next, struct acpi_video_device,
1565                                          entry);
1566                         dev_prev =
1567                             container_of(node->prev, struct acpi_video_device,
1568                                          entry);
1569                         goto out;
1570                 }
1571         }
1572         dev_next = container_of(node->next, struct acpi_video_device, entry);
1573         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1574       out:
1575         switch (event) {
1576         case ACPI_VIDEO_NOTIFY_CYCLE:
1577         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1578                 acpi_video_device_set_state(dev, 0);
1579                 acpi_video_device_set_state(dev_next, 0x80000001);
1580                 break;
1581         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1582                 acpi_video_device_set_state(dev, 0);
1583                 acpi_video_device_set_state(dev_prev, 0x80000001);
1584         default:
1585                 break;
1586         }
1587
1588         return status;
1589 }
1590
1591 static int
1592 acpi_video_get_next_level(struct acpi_video_device *device,
1593                           u32 level_current, u32 event)
1594 {
1595         int min, max, min_above, max_below, i, l;
1596         max = max_below = 0;
1597         min = min_above = 255;
1598         for (i = 0; i < device->brightness->count; i++) {
1599                 l = device->brightness->levels[i];
1600                 if (l < min)
1601                         min = l;
1602                 if (l > max)
1603                         max = l;
1604                 if (l < min_above && l > level_current)
1605                         min_above = l;
1606                 if (l > max_below && l < level_current)
1607                         max_below = l;
1608         }
1609
1610         switch (event) {
1611         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1612                 return (level_current < max) ? min_above : min;
1613         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1614                 return (level_current < max) ? min_above : max;
1615         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1616                 return (level_current > min) ? max_below : min;
1617         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1618         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1619                 return 0;
1620         default:
1621                 return level_current;
1622         }
1623 }
1624
1625 static void
1626 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1627 {
1628         unsigned long level_current, level_next;
1629         acpi_video_device_lcd_get_level_current(device, &level_current);
1630         level_next = acpi_video_get_next_level(device, level_current, event);
1631         acpi_video_device_lcd_set_level(device, level_next);
1632 }
1633
1634 static int
1635 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1636                            struct acpi_device *device)
1637 {
1638         int status = 0;
1639         struct list_head *node, *next;
1640
1641
1642         acpi_video_device_enumerate(video);
1643
1644         list_for_each_safe(node, next, &device->children) {
1645                 struct acpi_device *dev =
1646                     list_entry(node, struct acpi_device, node);
1647
1648                 if (!dev)
1649                         continue;
1650
1651                 status = acpi_video_bus_get_one_device(dev, video);
1652                 if (ACPI_FAILURE(status)) {
1653                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1654                         continue;
1655                 }
1656
1657         }
1658         return status;
1659 }
1660
1661 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1662 {
1663         acpi_status status;
1664         struct acpi_video_bus *video;
1665
1666
1667         if (!device || !device->video)
1668                 return -ENOENT;
1669
1670         video = device->video;
1671
1672         down(&video->sem);
1673         list_del(&device->entry);
1674         up(&video->sem);
1675         acpi_video_device_remove_fs(device->dev);
1676
1677         status = acpi_remove_notify_handler(device->dev->handle,
1678                                             ACPI_DEVICE_NOTIFY,
1679                                             acpi_video_device_notify);
1680         if (device->backlight){
1681                 backlight_device_unregister(device->backlight);
1682                 kfree(device->data);
1683         }
1684         return 0;
1685 }
1686
1687 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1688 {
1689         int status;
1690         struct list_head *node, *next;
1691
1692
1693         list_for_each_safe(node, next, &video->video_device_list) {
1694                 struct acpi_video_device *data =
1695                     list_entry(node, struct acpi_video_device, entry);
1696                 if (!data)
1697                         continue;
1698
1699                 status = acpi_video_bus_put_one_device(data);
1700                 if (ACPI_FAILURE(status))
1701                         printk(KERN_WARNING PREFIX
1702                                "hhuuhhuu bug in acpi video driver.\n");
1703
1704                 if (data->brightness)
1705                         kfree(data->brightness->levels);
1706                 kfree(data->brightness);
1707                 kfree(data);
1708         }
1709
1710         return 0;
1711 }
1712
1713 /* acpi_video interface */
1714
1715 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1716 {
1717         return acpi_video_bus_DOS(video, 1, 0);
1718 }
1719
1720 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1721 {
1722         return acpi_video_bus_DOS(video, 0, 1);
1723 }
1724
1725 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1726 {
1727         struct acpi_video_bus *video = data;
1728         struct acpi_device *device = NULL;
1729
1730         printk("video bus notify\n");
1731
1732         if (!video)
1733                 return;
1734
1735         device = video->device;
1736
1737         switch (event) {
1738         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1739                                          * most likely via hotkey. */
1740                 acpi_bus_generate_event(device, event, 0);
1741                 break;
1742
1743         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1744                                          * connector. */
1745                 acpi_video_device_enumerate(video);
1746                 acpi_video_device_rebind(video);
1747                 acpi_video_switch_output(video, event);
1748                 acpi_bus_generate_event(device, event, 0);
1749                 break;
1750
1751         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1752         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1753         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1754                 acpi_video_switch_output(video, event);
1755                 acpi_bus_generate_event(device, event, 0);
1756                 break;
1757
1758         default:
1759                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1760                                   "Unsupported event [0x%x]\n", event));
1761                 break;
1762         }
1763
1764         return;
1765 }
1766
1767 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1768 {
1769         struct acpi_video_device *video_device = data;
1770         struct acpi_device *device = NULL;
1771
1772         if (!video_device)
1773                 return;
1774
1775         device = video_device->dev;
1776
1777         switch (event) {
1778         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1779         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1780                 acpi_bus_generate_event(device, event, 0);
1781                 break;
1782         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1783         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1784         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1785         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1786         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1787                 acpi_video_switch_brightness(video_device, event);
1788                 acpi_bus_generate_event(device, event, 0);
1789                 break;
1790         default:
1791                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1792                                   "Unsupported event [0x%x]\n", event));
1793                 break;
1794         }
1795         return;
1796 }
1797
1798 static int acpi_video_bus_add(struct acpi_device *device)
1799 {
1800         int result = 0;
1801         acpi_status status = 0;
1802         struct acpi_video_bus *video = NULL;
1803
1804
1805         if (!device)
1806                 return -EINVAL;
1807
1808         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1809         if (!video)
1810                 return -ENOMEM;
1811
1812         video->device = device;
1813         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1814         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1815         acpi_driver_data(device) = video;
1816
1817         acpi_video_bus_find_cap(video);
1818         result = acpi_video_bus_check(video);
1819         if (result)
1820                 goto end;
1821
1822         result = acpi_video_bus_add_fs(device);
1823         if (result)
1824                 goto end;
1825
1826         init_MUTEX(&video->sem);
1827         INIT_LIST_HEAD(&video->video_device_list);
1828
1829         acpi_video_bus_get_devices(video, device);
1830         acpi_video_bus_start_devices(video);
1831
1832         status = acpi_install_notify_handler(device->handle,
1833                                              ACPI_DEVICE_NOTIFY,
1834                                              acpi_video_bus_notify, video);
1835         if (ACPI_FAILURE(status)) {
1836                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1837                                   "Error installing notify handler\n"));
1838                 acpi_video_bus_stop_devices(video);
1839                 acpi_video_bus_put_devices(video);
1840                 kfree(video->attached_array);
1841                 acpi_video_bus_remove_fs(device);
1842                 result = -ENODEV;
1843                 goto end;
1844         }
1845
1846         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1847                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1848                video->flags.multihead ? "yes" : "no",
1849                video->flags.rom ? "yes" : "no",
1850                video->flags.post ? "yes" : "no");
1851
1852       end:
1853         if (result)
1854                 kfree(video);
1855
1856         return result;
1857 }
1858
1859 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1860 {
1861         acpi_status status = 0;
1862         struct acpi_video_bus *video = NULL;
1863
1864
1865         if (!device || !acpi_driver_data(device))
1866                 return -EINVAL;
1867
1868         video = acpi_driver_data(device);
1869
1870         acpi_video_bus_stop_devices(video);
1871
1872         status = acpi_remove_notify_handler(video->device->handle,
1873                                             ACPI_DEVICE_NOTIFY,
1874                                             acpi_video_bus_notify);
1875
1876         acpi_video_bus_put_devices(video);
1877         acpi_video_bus_remove_fs(device);
1878
1879         kfree(video->attached_array);
1880         kfree(video);
1881
1882         return 0;
1883 }
1884
1885 static int __init acpi_video_init(void)
1886 {
1887         int result = 0;
1888
1889
1890         /*
1891            acpi_dbg_level = 0xFFFFFFFF;
1892            acpi_dbg_layer = 0x08000000;
1893          */
1894
1895         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1896         if (!acpi_video_dir)
1897                 return -ENODEV;
1898         acpi_video_dir->owner = THIS_MODULE;
1899
1900         result = acpi_bus_register_driver(&acpi_video_bus);
1901         if (result < 0) {
1902                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1903                 return -ENODEV;
1904         }
1905
1906         return 0;
1907 }
1908
1909 static void __exit acpi_video_exit(void)
1910 {
1911
1912         acpi_bus_unregister_driver(&acpi_video_bus);
1913
1914         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1915
1916         return;
1917 }
1918
1919 module_init(acpi_video_init);
1920 module_exit(acpi_video_exit);