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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 <asm/uaccess.h>
  36
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define ACPI_VIDEO_COMPONENT            0x08000000
  41 #define ACPI_VIDEO_CLASS                "video"
  42 #define ACPI_VIDEO_DRIVER_NAME          "ACPI Video Driver"
  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
  60 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  61 ACPI_MODULE_NAME("acpi_video")
  62
  63     MODULE_AUTHOR("Bruno Ducrot");
  64 MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
  65 MODULE_LICENSE("GPL");
  66
  67 static int acpi_video_bus_add(struct acpi_device *device);
  68 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  69 static int acpi_video_bus_match(struct acpi_device *device,
  70                                 struct acpi_driver *driver);
  71
  72 static struct acpi_driver acpi_video_bus = {
  73         .name = ACPI_VIDEO_DRIVER_NAME,
  74         .class = ACPI_VIDEO_CLASS,
  75         .ops = {
  76                 .add = acpi_video_bus_add,
  77                 .remove = acpi_video_bus_remove,
  78                 .match = acpi_video_bus_match,
  79                 },
  80 };
  81
  82 struct acpi_video_bus_flags {
  83         u8 multihead:1;         /* can switch video heads */
  84         u8 rom:1;               /* can retrieve a video rom */
  85         u8 post:1;              /* can configure the head to */
  86         u8 reserved:5;
  87 };
  88
  89 struct acpi_video_bus_cap {
  90         u8 _DOS:1;              /*Enable/Disable output switching */
  91         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
  92         u8 _ROM:1;              /*Get ROM Data */
  93         u8 _GPD:1;              /*Get POST Device */
  94         u8 _SPD:1;              /*Set POST Device */
  95         u8 _VPO:1;              /*Video POST Options */
  96         u8 reserved:2;
  97 };
  98
  99 struct acpi_video_device_attrib {
 100         u32 display_index:4;    /* A zero-based instance of the Display */
 101         u32 display_port_attachment:4;  /*This field differenates displays type */
 102         u32 display_type:4;     /*Describe the specific type in use */
 103         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
 104         u32 bios_can_detect:1;  /*BIOS can detect the device */
 105         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 106                                    the VGA device. */
 107         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 108         u32 reserved:10;        /*Must be 0 */
 109         u32 device_id_scheme:1; /*Device ID Scheme */
 110 };
 111
 112 struct acpi_video_enumerated_device {
 113         union {
 114                 u32 int_val;
 115                 struct acpi_video_device_attrib attrib;
 116         } value;
 117         struct acpi_video_device *bind_info;
 118 };
 119
 120 struct acpi_video_bus {
 121         struct acpi_device *device;
 122         u8 dos_setting;
 123         struct acpi_video_enumerated_device *attached_array;
 124         u8 attached_count;
 125         struct acpi_video_bus_cap cap;
 126         struct acpi_video_bus_flags flags;
 127         struct semaphore sem;
 128         struct list_head video_device_list;
 129         struct proc_dir_entry *dir;
 130 };
 131
 132 struct acpi_video_device_flags {
 133         u8 crt:1;
 134         u8 lcd:1;
 135         u8 tvout:1;
 136         u8 bios:1;
 137         u8 unknown:1;
 138         u8 reserved:3;
 139 };
 140
 141 struct acpi_video_device_cap {
 142         u8 _ADR:1;              /*Return the unique ID */
 143         u8 _BCL:1;              /*Query list of brightness control levels supported */
 144         u8 _BCM:1;              /*Set the brightness level */
 145         u8 _DDC:1;              /*Return the EDID for this device */
 146         u8 _DCS:1;              /*Return status of output device */
 147         u8 _DGS:1;              /*Query graphics state */
 148         u8 _DSS:1;              /*Device state set */
 149         u8 _reserved:1;
 150 };
 151
 152 struct acpi_video_device_brightness {
 153         int curr;
 154         int count;
 155         int *levels;
 156 };
 157
 158 struct acpi_video_device {
 159         unsigned long device_id;
 160         struct acpi_video_device_flags flags;
 161         struct acpi_video_device_cap cap;
 162         struct list_head entry;
 163         struct acpi_video_bus *video;
 164         struct acpi_device *dev;
 165         struct acpi_video_device_brightness *brightness;
 166 };
 167
 168 /* bus */
 169 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 170 static struct file_operations acpi_video_bus_info_fops = {
 171         .open = acpi_video_bus_info_open_fs,
 172         .read = seq_read,
 173         .llseek = seq_lseek,
 174         .release = single_release,
 175 };
 176
 177 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 178 static struct file_operations acpi_video_bus_ROM_fops = {
 179         .open = acpi_video_bus_ROM_open_fs,
 180         .read = seq_read,
 181         .llseek = seq_lseek,
 182         .release = single_release,
 183 };
 184
 185 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 186                                             struct file *file);
 187 static struct file_operations acpi_video_bus_POST_info_fops = {
 188         .open = acpi_video_bus_POST_info_open_fs,
 189         .read = seq_read,
 190         .llseek = seq_lseek,
 191         .release = single_release,
 192 };
 193
 194 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 195 static struct file_operations acpi_video_bus_POST_fops = {
 196         .open = acpi_video_bus_POST_open_fs,
 197         .read = seq_read,
 198         .llseek = seq_lseek,
 199         .release = single_release,
 200 };
 201
 202 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 203 static struct file_operations acpi_video_bus_DOS_fops = {
 204         .open = acpi_video_bus_DOS_open_fs,
 205         .read = seq_read,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 /* device */
 211 static int acpi_video_device_info_open_fs(struct inode *inode,
 212                                           struct file *file);
 213 static struct file_operations acpi_video_device_info_fops = {
 214         .open = acpi_video_device_info_open_fs,
 215         .read = seq_read,
 216         .llseek = seq_lseek,
 217         .release = single_release,
 218 };
 219
 220 static int acpi_video_device_state_open_fs(struct inode *inode,
 221                                            struct file *file);
 222 static struct file_operations acpi_video_device_state_fops = {
 223         .open = acpi_video_device_state_open_fs,
 224         .read = seq_read,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 230                                                 struct file *file);
 231 static struct file_operations acpi_video_device_brightness_fops = {
 232         .open = acpi_video_device_brightness_open_fs,
 233         .read = seq_read,
 234         .llseek = seq_lseek,
 235         .release = single_release,
 236 };
 237
 238 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 239                                           struct file *file);
 240 static struct file_operations acpi_video_device_EDID_fops = {
 241         .open = acpi_video_device_EDID_open_fs,
 242         .read = seq_read,
 243         .llseek = seq_lseek,
 244         .release = single_release,
 245 };
 246
 247 static char device_decode[][30] = {
 248         "motherboard VGA device",
 249         "PCI VGA device",
 250         "AGP VGA device",
 251         "UNKNOWN",
 252 };
 253
 254 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 255 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 256 static void acpi_video_device_bind(struct acpi_video_bus *video,
 257                                    struct acpi_video_device *device);
 258 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 259 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 260 static int acpi_video_get_next_level(struct acpi_video_device *device,
 261                                      u32 level_current, u32 event);
 262 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 263                                          int event);
 264
 265 /* --------------------------------------------------------------------------
 266                                Video Management
 267    -------------------------------------------------------------------------- */
 268
 269 /* device */
 270
 271 static int
 272 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 273 {
 274         int status;
 275
 276         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 277
 278         return status;
 279 }
 280
 281 static int
 282 acpi_video_device_get_state(struct acpi_video_device *device,
 283                             unsigned long *state)
 284 {
 285         int status;
 286
 287         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 288
 289         return status;
 290 }
 291
 292 static int
 293 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 294 {
 295         int status;
 296         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 297         struct acpi_object_list args = { 1, &arg0 };
 298         unsigned long ret;
 299
 300
 301         arg0.integer.value = state;
 302         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 303
 304         return status;
 305 }
 306
 307 static int
 308 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 309                                    union acpi_object **levels)
 310 {
 311         int status;
 312         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 313         union acpi_object *obj;
 314
 315
 316         *levels = NULL;
 317
 318         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 319         if (!ACPI_SUCCESS(status))
 320                 return status;
 321         obj = (union acpi_object *)buffer.pointer;
 322         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 323                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 324                 status = -EFAULT;
 325                 goto err;
 326         }
 327
 328         *levels = obj;
 329
 330         return 0;
 331
 332       err:
 333         kfree(buffer.pointer);
 334
 335         return status;
 336 }
 337
 338 static int
 339 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 340 {
 341         int status;
 342         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 343         struct acpi_object_list args = { 1, &arg0 };
 344
 345
 346         arg0.integer.value = level;
 347         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 348
 349         printk(KERN_DEBUG "set_level status: %x\n", status);
 350         return status;
 351 }
 352
 353 static int
 354 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 355                                         unsigned long *level)
 356 {
 357         int status;
 358
 359         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
 360
 361         return status;
 362 }
 363
 364 static int
 365 acpi_video_device_EDID(struct acpi_video_device *device,
 366                        union acpi_object **edid, ssize_t length)
 367 {
 368         int status;
 369         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 370         union acpi_object *obj;
 371         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 372         struct acpi_object_list args = { 1, &arg0 };
 373
 374
 375         *edid = NULL;
 376
 377         if (!device)
 378                 return -ENODEV;
 379         if (length == 128)
 380                 arg0.integer.value = 1;
 381         else if (length == 256)
 382                 arg0.integer.value = 2;
 383         else
 384                 return -EINVAL;
 385
 386         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 387         if (ACPI_FAILURE(status))
 388                 return -ENODEV;
 389
 390         obj = buffer.pointer;
 391
 392         if (obj && obj->type == ACPI_TYPE_BUFFER)
 393                 *edid = obj;
 394         else {
 395                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 396                 status = -EFAULT;
 397                 kfree(obj);
 398         }
 399
 400         return status;
 401 }
 402
 403 /* bus */
 404
 405 static int
 406 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 407 {
 408         int status;
 409         unsigned long tmp;
 410         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 411         struct acpi_object_list args = { 1, &arg0 };
 412
 413
 414         arg0.integer.value = option;
 415
 416         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 417         if (ACPI_SUCCESS(status))
 418                 status = tmp ? (-EINVAL) : (AE_OK);
 419
 420         return status;
 421 }
 422
 423 static int
 424 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 425 {
 426         int status;
 427
 428         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 429
 430         return status;
 431 }
 432
 433 static int
 434 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 435                             unsigned long *options)
 436 {
 437         int status;
 438
 439         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 440         *options &= 3;
 441
 442         return status;
 443 }
 444
 445 /*
 446  *  Arg:
 447  *      video           : video bus device pointer
 448  *      bios_flag       :
 449  *              0.      The system BIOS should NOT automatically switch(toggle)
 450  *                      the active display output.
 451  *              1.      The system BIOS should automatically switch (toggle) the
 452  *                      active display output. No swich event.
 453  *              2.      The _DGS value should be locked.
 454  *              3.      The system BIOS should not automatically switch (toggle) the
 455  *                      active display output, but instead generate the display switch
 456  *                      event notify code.
 457  *      lcd_flag        :
 458  *              0.      The system BIOS should automatically control the brightness level
 459  *                      of the LCD, when the power changes from AC to DC
 460  *              1.      The system BIOS should NOT automatically control the brightness
 461  *                      level of the LCD, when the power changes from AC to DC.
 462  * Return Value:
 463  *              -1      wrong arg.
 464  */
 465
 466 static int
 467 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 468 {
 469         acpi_integer status = 0;
 470         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 471         struct acpi_object_list args = { 1, &arg0 };
 472
 473
 474         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 475                 status = -1;
 476                 goto Failed;
 477         }
 478         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 479         video->dos_setting = arg0.integer.value;
 480         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 481
 482       Failed:
 483         return status;
 484 }
 485
 486 /*
 487  *  Arg:
 488  *      device  : video output device (LCD, CRT, ..)
 489  *
 490  *  Return Value:
 491  *      None
 492  *
 493  *  Find out all required AML method defined under the output
 494  *  device.
 495  */
 496
 497 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 498 {
 499         acpi_integer status;
 500         acpi_handle h_dummy1;
 501         int i;
 502         union acpi_object *obj = NULL;
 503         struct acpi_video_device_brightness *br = NULL;
 504
 505
 506         memset(&device->cap, 0, 4);
 507
 508         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 509                 device->cap._ADR = 1;
 510         }
 511         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 512                 device->cap._BCL = 1;
 513         }
 514         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 515                 device->cap._BCM = 1;
 516         }
 517         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 518                 device->cap._DDC = 1;
 519         }
 520         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 521                 device->cap._DCS = 1;
 522         }
 523         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 524                 device->cap._DGS = 1;
 525         }
 526         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 527                 device->cap._DSS = 1;
 528         }
 529
 530         status = acpi_video_device_lcd_query_levels(device, &obj);
 531
 532         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 533                 int count = 0;
 534                 union acpi_object *o;
 535
 536                 br = kzalloc(sizeof(*br), GFP_KERNEL);
 537                 if (!br) {
 538                         printk(KERN_ERR "can't allocate memory\n");
 539                 } else {
 540                         br->levels = kmalloc(obj->package.count *
 541                                              sizeof *(br->levels), GFP_KERNEL);
 542                         if (!br->levels)
 543                                 goto out;
 544
 545                         for (i = 0; i < obj->package.count; i++) {
 546                                 o = (union acpi_object *)&obj->package.
 547                                     elements[i];
 548                                 if (o->type != ACPI_TYPE_INTEGER) {
 549                                         printk(KERN_ERR PREFIX "Invalid data\n");
 550                                         continue;
 551                                 }
 552                                 br->levels[count] = (u32) o->integer.value;
 553                                 count++;
 554                         }
 555                       out:
 556                         if (count < 2) {
 557                                 kfree(br->levels);
 558                                 kfree(br);
 559                         } else {
 560                                 br->count = count;
 561                                 device->brightness = br;
 562                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 563                                                   "found %d brightness levels\n",
 564                                                   count));
 565                         }
 566                 }
 567         }
 568
 569         kfree(obj);
 570
 571         return;
 572 }
 573
 574 /*
 575  *  Arg:
 576  *      device  : video output device (VGA)
 577  *
 578  *  Return Value:
 579  *      None
 580  *
 581  *  Find out all required AML method defined under the video bus device.
 582  */
 583
 584 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 585 {
 586         acpi_handle h_dummy1;
 587
 588         memset(&video->cap, 0, 4);
 589         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 590                 video->cap._DOS = 1;
 591         }
 592         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 593                 video->cap._DOD = 1;
 594         }
 595         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 596                 video->cap._ROM = 1;
 597         }
 598         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 599                 video->cap._GPD = 1;
 600         }
 601         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 602                 video->cap._SPD = 1;
 603         }
 604         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 605                 video->cap._VPO = 1;
 606         }
 607 }
 608
 609 /*
 610  * Check whether the video bus device has required AML method to
 611  * support the desired features
 612  */
 613
 614 static int acpi_video_bus_check(struct acpi_video_bus *video)
 615 {
 616         acpi_status status = -ENOENT;
 617
 618
 619         if (!video)
 620                 return -EINVAL;
 621
 622         /* Since there is no HID, CID and so on for VGA driver, we have
 623          * to check well known required nodes.
 624          */
 625
 626         /* Does this device able to support video switching ? */
 627         if (video->cap._DOS) {
 628                 video->flags.multihead = 1;
 629                 status = 0;
 630         }
 631
 632         /* Does this device able to retrieve a retrieve a video ROM ? */
 633         if (video->cap._ROM) {
 634                 video->flags.rom = 1;
 635                 status = 0;
 636         }
 637
 638         /* Does this device able to configure which video device to POST ? */
 639         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 640                 video->flags.post = 1;
 641                 status = 0;
 642         }
 643
 644         return status;
 645 }
 646
 647 /* --------------------------------------------------------------------------
 648                               FS Interface (/proc)
 649    -------------------------------------------------------------------------- */
 650
 651 static struct proc_dir_entry *acpi_video_dir;
 652
 653 /* video devices */
 654
 655 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 656 {
 657         struct acpi_video_device *dev = seq->private;
 658
 659
 660         if (!dev)
 661                 goto end;
 662
 663         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 664         seq_printf(seq, "type:         ");
 665         if (dev->flags.crt)
 666                 seq_printf(seq, "CRT\n");
 667         else if (dev->flags.lcd)
 668                 seq_printf(seq, "LCD\n");
 669         else if (dev->flags.tvout)
 670                 seq_printf(seq, "TVOUT\n");
 671         else
 672                 seq_printf(seq, "UNKNOWN\n");
 673
 674         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 675
 676       end:
 677         return 0;
 678 }
 679
 680 static int
 681 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 682 {
 683         return single_open(file, acpi_video_device_info_seq_show,
 684                            PDE(inode)->data);
 685 }
 686
 687 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 688 {
 689         int status;
 690         struct acpi_video_device *dev = seq->private;
 691         unsigned long state;
 692
 693
 694         if (!dev)
 695                 goto end;
 696
 697         status = acpi_video_device_get_state(dev, &state);
 698         seq_printf(seq, "state:     ");
 699         if (ACPI_SUCCESS(status))
 700                 seq_printf(seq, "0x%02lx\n", state);
 701         else
 702                 seq_printf(seq, "<not supported>\n");
 703
 704         status = acpi_video_device_query(dev, &state);
 705         seq_printf(seq, "query:     ");
 706         if (ACPI_SUCCESS(status))
 707                 seq_printf(seq, "0x%02lx\n", state);
 708         else
 709                 seq_printf(seq, "<not supported>\n");
 710
 711       end:
 712         return 0;
 713 }
 714
 715 static int
 716 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 717 {
 718         return single_open(file, acpi_video_device_state_seq_show,
 719                            PDE(inode)->data);
 720 }
 721
 722 static ssize_t
 723 acpi_video_device_write_state(struct file *file,
 724                               const char __user * buffer,
 725                               size_t count, loff_t * data)
 726 {
 727         int status;
 728         struct seq_file *m = file->private_data;
 729         struct acpi_video_device *dev = m->private;
 730         char str[12] = { 0 };
 731         u32 state = 0;
 732
 733
 734         if (!dev || count + 1 > sizeof str)
 735                 return -EINVAL;
 736
 737         if (copy_from_user(str, buffer, count))
 738                 return -EFAULT;
 739
 740         str[count] = 0;
 741         state = simple_strtoul(str, NULL, 0);
 742         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 743
 744         status = acpi_video_device_set_state(dev, state);
 745
 746         if (status)
 747                 return -EFAULT;
 748
 749         return count;
 750 }
 751
 752 static int
 753 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 754 {
 755         struct acpi_video_device *dev = seq->private;
 756         int i;
 757
 758
 759         if (!dev || !dev->brightness) {
 760                 seq_printf(seq, "<not supported>\n");
 761                 return 0;
 762         }
 763
 764         seq_printf(seq, "levels: ");
 765         for (i = 0; i < dev->brightness->count; i++)
 766                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 767         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 768
 769         return 0;
 770 }
 771
 772 static int
 773 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 774 {
 775         return single_open(file, acpi_video_device_brightness_seq_show,
 776                            PDE(inode)->data);
 777 }
 778
 779 static ssize_t
 780 acpi_video_device_write_brightness(struct file *file,
 781                                    const char __user * buffer,
 782                                    size_t count, loff_t * data)
 783 {
 784         struct seq_file *m = file->private_data;
 785         struct acpi_video_device *dev = m->private;
 786         char str[4] = { 0 };
 787         unsigned int level = 0;
 788         int i;
 789
 790
 791         if (!dev || !dev->brightness || count + 1 > sizeof str)
 792                 return -EINVAL;
 793
 794         if (copy_from_user(str, buffer, count))
 795                 return -EFAULT;
 796
 797         str[count] = 0;
 798         level = simple_strtoul(str, NULL, 0);
 799
 800         if (level > 100)
 801                 return -EFAULT;
 802
 803         /* validate though the list of available levels */
 804         for (i = 0; i < dev->brightness->count; i++)
 805                 if (level == dev->brightness->levels[i]) {
 806                         if (ACPI_SUCCESS
 807                             (acpi_video_device_lcd_set_level(dev, level)))
 808                                 dev->brightness->curr = level;
 809                         break;
 810                 }
 811
 812         return count;
 813 }
 814
 815 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 816 {
 817         struct acpi_video_device *dev = seq->private;
 818         int status;
 819         int i;
 820         union acpi_object *edid = NULL;
 821
 822
 823         if (!dev)
 824                 goto out;
 825
 826         status = acpi_video_device_EDID(dev, &edid, 128);
 827         if (ACPI_FAILURE(status)) {
 828                 status = acpi_video_device_EDID(dev, &edid, 256);
 829         }
 830
 831         if (ACPI_FAILURE(status)) {
 832                 goto out;
 833         }
 834
 835         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 836                 for (i = 0; i < edid->buffer.length; i++)
 837                         seq_putc(seq, edid->buffer.pointer[i]);
 838         }
 839
 840       out:
 841         if (!edid)
 842                 seq_printf(seq, "<not supported>\n");
 843         else
 844                 kfree(edid);
 845
 846         return 0;
 847 }
 848
 849 static int
 850 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 851 {
 852         return single_open(file, acpi_video_device_EDID_seq_show,
 853                            PDE(inode)->data);
 854 }
 855
 856 static int acpi_video_device_add_fs(struct acpi_device *device)
 857 {
 858         struct proc_dir_entry *entry = NULL;
 859         struct acpi_video_device *vid_dev;
 860
 861
 862         if (!device)
 863                 return -ENODEV;
 864
 865         vid_dev = acpi_driver_data(device);
 866         if (!vid_dev)
 867                 return -ENODEV;
 868
 869         if (!acpi_device_dir(device)) {
 870                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 871                                                      vid_dev->video->dir);
 872                 if (!acpi_device_dir(device))
 873                         return -ENODEV;
 874                 acpi_device_dir(device)->owner = THIS_MODULE;
 875         }
 876
 877         /* 'info' [R] */
 878         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 879         if (!entry)
 880                 return -ENODEV;
 881         else {
 882                 entry->proc_fops = &acpi_video_device_info_fops;
 883                 entry->data = acpi_driver_data(device);
 884                 entry->owner = THIS_MODULE;
 885         }
 886
 887         /* 'state' [R/W] */
 888         entry =
 889             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 890                               acpi_device_dir(device));
 891         if (!entry)
 892                 return -ENODEV;
 893         else {
 894                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 895                 entry->proc_fops = &acpi_video_device_state_fops;
 896                 entry->data = acpi_driver_data(device);
 897                 entry->owner = THIS_MODULE;
 898         }
 899
 900         /* 'brightness' [R/W] */
 901         entry =
 902             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 903                               acpi_device_dir(device));
 904         if (!entry)
 905                 return -ENODEV;
 906         else {
 907                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 908                 entry->proc_fops = &acpi_video_device_brightness_fops;
 909                 entry->data = acpi_driver_data(device);
 910                 entry->owner = THIS_MODULE;
 911         }
 912
 913         /* 'EDID' [R] */
 914         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 915         if (!entry)
 916                 return -ENODEV;
 917         else {
 918                 entry->proc_fops = &acpi_video_device_EDID_fops;
 919                 entry->data = acpi_driver_data(device);
 920                 entry->owner = THIS_MODULE;
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int acpi_video_device_remove_fs(struct acpi_device *device)
 927 {
 928         struct acpi_video_device *vid_dev;
 929
 930         vid_dev = acpi_driver_data(device);
 931         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 932                 return -ENODEV;
 933
 934         if (acpi_device_dir(device)) {
 935                 remove_proc_entry("info", acpi_device_dir(device));
 936                 remove_proc_entry("state", acpi_device_dir(device));
 937                 remove_proc_entry("brightness", acpi_device_dir(device));
 938                 remove_proc_entry("EDID", acpi_device_dir(device));
 939                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
 940                 acpi_device_dir(device) = NULL;
 941         }
 942
 943         return 0;
 944 }
 945
 946 /* video bus */
 947 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
 948 {
 949         struct acpi_video_bus *video = seq->private;
 950
 951
 952         if (!video)
 953                 goto end;
 954
 955         seq_printf(seq, "Switching heads:              %s\n",
 956                    video->flags.multihead ? "yes" : "no");
 957         seq_printf(seq, "Video ROM:                    %s\n",
 958                    video->flags.rom ? "yes" : "no");
 959         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
 960                    video->flags.post ? "yes" : "no");
 961
 962       end:
 963         return 0;
 964 }
 965
 966 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
 967 {
 968         return single_open(file, acpi_video_bus_info_seq_show,
 969                            PDE(inode)->data);
 970 }
 971
 972 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
 973 {
 974         struct acpi_video_bus *video = seq->private;
 975
 976
 977         if (!video)
 978                 goto end;
 979
 980         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
 981         seq_printf(seq, "<TODO>\n");
 982
 983       end:
 984         return 0;
 985 }
 986
 987 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
 988 {
 989         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
 990 }
 991
 992 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
 993 {
 994         struct acpi_video_bus *video = seq->private;
 995         unsigned long options;
 996         int status;
 997
 998
 999         if (!video)
1000                 goto end;
1001
1002         status = acpi_video_bus_POST_options(video, &options);
1003         if (ACPI_SUCCESS(status)) {
1004                 if (!(options & 1)) {
1005                         printk(KERN_WARNING PREFIX
1006                                "The motherboard VGA device is not listed as a possible POST device.\n");
1007                         printk(KERN_WARNING PREFIX
1008                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1009                 }
1010                 printk("%lx\n", options);
1011                 seq_printf(seq, "can POST: <intgrated video>");
1012                 if (options & 2)
1013                         seq_printf(seq, " <PCI video>");
1014                 if (options & 4)
1015                         seq_printf(seq, " <AGP video>");
1016                 seq_putc(seq, '\n');
1017         } else
1018                 seq_printf(seq, "<not supported>\n");
1019       end:
1020         return 0;
1021 }
1022
1023 static int
1024 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1025 {
1026         return single_open(file, acpi_video_bus_POST_info_seq_show,
1027                            PDE(inode)->data);
1028 }
1029
1030 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1031 {
1032         struct acpi_video_bus *video = seq->private;
1033         int status;
1034         unsigned long id;
1035
1036
1037         if (!video)
1038                 goto end;
1039
1040         status = acpi_video_bus_get_POST(video, &id);
1041         if (!ACPI_SUCCESS(status)) {
1042                 seq_printf(seq, "<not supported>\n");
1043                 goto end;
1044         }
1045         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1046
1047       end:
1048         return 0;
1049 }
1050
1051 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1052 {
1053         struct acpi_video_bus *video = seq->private;
1054
1055
1056         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1057
1058         return 0;
1059 }
1060
1061 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1062 {
1063         return single_open(file, acpi_video_bus_POST_seq_show,
1064                            PDE(inode)->data);
1065 }
1066
1067 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1068 {
1069         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1070 }
1071
1072 static ssize_t
1073 acpi_video_bus_write_POST(struct file *file,
1074                           const char __user * buffer,
1075                           size_t count, loff_t * data)
1076 {
1077         int status;
1078         struct seq_file *m = file->private_data;
1079         struct acpi_video_bus *video = m->private;
1080         char str[12] = { 0 };
1081         unsigned long opt, options;
1082
1083
1084         if (!video || count + 1 > sizeof str)
1085                 return -EINVAL;
1086
1087         status = acpi_video_bus_POST_options(video, &options);
1088         if (!ACPI_SUCCESS(status))
1089                 return -EINVAL;
1090
1091         if (copy_from_user(str, buffer, count))
1092                 return -EFAULT;
1093
1094         str[count] = 0;
1095         opt = strtoul(str, NULL, 0);
1096         if (opt > 3)
1097                 return -EFAULT;
1098
1099         /* just in case an OEM 'forget' the motherboard... */
1100         options |= 1;
1101
1102         if (options & (1ul << opt)) {
1103                 status = acpi_video_bus_set_POST(video, opt);
1104                 if (!ACPI_SUCCESS(status))
1105                         return -EFAULT;
1106
1107         }
1108
1109         return count;
1110 }
1111
1112 static ssize_t
1113 acpi_video_bus_write_DOS(struct file *file,
1114                          const char __user * buffer,
1115                          size_t count, loff_t * data)
1116 {
1117         int status;
1118         struct seq_file *m = file->private_data;
1119         struct acpi_video_bus *video = m->private;
1120         char str[12] = { 0 };
1121         unsigned long opt;
1122
1123
1124         if (!video || count + 1 > sizeof str)
1125                 return -EINVAL;
1126
1127         if (copy_from_user(str, buffer, count))
1128                 return -EFAULT;
1129
1130         str[count] = 0;
1131         opt = strtoul(str, NULL, 0);
1132         if (opt > 7)
1133                 return -EFAULT;
1134
1135         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1136
1137         if (!ACPI_SUCCESS(status))
1138                 return -EFAULT;
1139
1140         return count;
1141 }
1142
1143 static int acpi_video_bus_add_fs(struct acpi_device *device)
1144 {
1145         struct proc_dir_entry *entry = NULL;
1146         struct acpi_video_bus *video;
1147
1148
1149         video = acpi_driver_data(device);
1150
1151         if (!acpi_device_dir(device)) {
1152                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1153                                                      acpi_video_dir);
1154                 if (!acpi_device_dir(device))
1155                         return -ENODEV;
1156                 video->dir = acpi_device_dir(device);
1157                 acpi_device_dir(device)->owner = THIS_MODULE;
1158         }
1159
1160         /* 'info' [R] */
1161         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1162         if (!entry)
1163                 return -ENODEV;
1164         else {
1165                 entry->proc_fops = &acpi_video_bus_info_fops;
1166                 entry->data = acpi_driver_data(device);
1167                 entry->owner = THIS_MODULE;
1168         }
1169
1170         /* 'ROM' [R] */
1171         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1172         if (!entry)
1173                 return -ENODEV;
1174         else {
1175                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1176                 entry->data = acpi_driver_data(device);
1177                 entry->owner = THIS_MODULE;
1178         }
1179
1180         /* 'POST_info' [R] */
1181         entry =
1182             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1183         if (!entry)
1184                 return -ENODEV;
1185         else {
1186                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1187                 entry->data = acpi_driver_data(device);
1188                 entry->owner = THIS_MODULE;
1189         }
1190
1191         /* 'POST' [R/W] */
1192         entry =
1193             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1194                               acpi_device_dir(device));
1195         if (!entry)
1196                 return -ENODEV;
1197         else {
1198                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1199                 entry->proc_fops = &acpi_video_bus_POST_fops;
1200                 entry->data = acpi_driver_data(device);
1201                 entry->owner = THIS_MODULE;
1202         }
1203
1204         /* 'DOS' [R/W] */
1205         entry =
1206             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1207                               acpi_device_dir(device));
1208         if (!entry)
1209                 return -ENODEV;
1210         else {
1211                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1212                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1213                 entry->data = acpi_driver_data(device);
1214                 entry->owner = THIS_MODULE;
1215         }
1216
1217         return 0;
1218 }
1219
1220 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1221 {
1222         struct acpi_video_bus *video;
1223
1224
1225         video = acpi_driver_data(device);
1226
1227         if (acpi_device_dir(device)) {
1228                 remove_proc_entry("info", acpi_device_dir(device));
1229                 remove_proc_entry("ROM", acpi_device_dir(device));
1230                 remove_proc_entry("POST_info", acpi_device_dir(device));
1231                 remove_proc_entry("POST", acpi_device_dir(device));
1232                 remove_proc_entry("DOS", acpi_device_dir(device));
1233                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1234                 acpi_device_dir(device) = NULL;
1235         }
1236
1237         return 0;
1238 }
1239
1240 /* --------------------------------------------------------------------------
1241                                  Driver Interface
1242    -------------------------------------------------------------------------- */
1243
1244 /* device interface */
1245
1246 static int
1247 acpi_video_bus_get_one_device(struct acpi_device *device,
1248                               struct acpi_video_bus *video)
1249 {
1250         unsigned long device_id;
1251         int status;
1252         struct acpi_video_device *data;
1253
1254
1255         if (!device || !video)
1256                 return -EINVAL;
1257
1258         status =
1259             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1260         if (ACPI_SUCCESS(status)) {
1261
1262                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1263                 if (!data)
1264                         return -ENOMEM;
1265
1266                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1267                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1268                 acpi_driver_data(device) = data;
1269
1270                 data->device_id = device_id;
1271                 data->video = video;
1272                 data->dev = device;
1273
1274                 switch (device_id & 0xffff) {
1275                 case 0x0100:
1276                         data->flags.crt = 1;
1277                         break;
1278                 case 0x0400:
1279                         data->flags.lcd = 1;
1280                         break;
1281                 case 0x0200:
1282                         data->flags.tvout = 1;
1283                         break;
1284                 default:
1285                         data->flags.unknown = 1;
1286                         break;
1287                 }
1288
1289                 acpi_video_device_bind(video, data);
1290                 acpi_video_device_find_cap(data);
1291
1292                 status = acpi_install_notify_handler(device->handle,
1293                                                      ACPI_DEVICE_NOTIFY,
1294                                                      acpi_video_device_notify,
1295                                                      data);
1296                 if (ACPI_FAILURE(status)) {
1297                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1298                                           "Error installing notify handler\n"));
1299                         if(data->brightness)
1300                                 kfree(data->brightness->levels);
1301                         kfree(data->brightness);
1302                         kfree(data);
1303                         return -ENODEV;
1304                 }
1305
1306                 down(&video->sem);
1307                 list_add_tail(&data->entry, &video->video_device_list);
1308                 up(&video->sem);
1309
1310                 acpi_video_device_add_fs(device);
1311
1312                 return 0;
1313         }
1314
1315         return -ENOENT;
1316 }
1317
1318 /*
1319  *  Arg:
1320  *      video   : video bus device
1321  *
1322  *  Return:
1323  *      none
1324  *
1325  *  Enumerate the video device list of the video bus,
1326  *  bind the ids with the corresponding video devices
1327  *  under the video bus.
1328  */
1329
1330 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1331 {
1332         struct list_head *node, *next;
1333         list_for_each_safe(node, next, &video->video_device_list) {
1334                 struct acpi_video_device *dev =
1335                     container_of(node, struct acpi_video_device, entry);
1336                 acpi_video_device_bind(video, dev);
1337         }
1338 }
1339
1340 /*
1341  *  Arg:
1342  *      video   : video bus device
1343  *      device  : video output device under the video
1344  *              bus
1345  *
1346  *  Return:
1347  *      none
1348  *
1349  *  Bind the ids with the corresponding video devices
1350  *  under the video bus.
1351  */
1352
1353 static void
1354 acpi_video_device_bind(struct acpi_video_bus *video,
1355                        struct acpi_video_device *device)
1356 {
1357         int i;
1358
1359 #define IDS_VAL(i) video->attached_array[i].value.int_val
1360 #define IDS_BIND(i) video->attached_array[i].bind_info
1361
1362         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1363              i < video->attached_count; i++) {
1364                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1365                         IDS_BIND(i) = device;
1366                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1367                 }
1368         }
1369 #undef IDS_VAL
1370 #undef IDS_BIND
1371 }
1372
1373 /*
1374  *  Arg:
1375  *      video   : video bus device
1376  *
1377  *  Return:
1378  *      < 0     : error
1379  *
1380  *  Call _DOD to enumerate all devices attached to display adapter
1381  *
1382  */
1383
1384 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1385 {
1386         int status;
1387         int count;
1388         int i;
1389         struct acpi_video_enumerated_device *active_device_list;
1390         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1391         union acpi_object *dod = NULL;
1392         union acpi_object *obj;
1393
1394         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1395         if (!ACPI_SUCCESS(status)) {
1396                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1397                 return status;
1398         }
1399
1400         dod = buffer.pointer;
1401         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1402                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1403                 status = -EFAULT;
1404                 goto out;
1405         }
1406
1407         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1408                           dod->package.count));
1409
1410         active_device_list = kmalloc((1 +
1411                                       dod->package.count) *
1412                                      sizeof(struct
1413                                             acpi_video_enumerated_device),
1414                                      GFP_KERNEL);
1415
1416         if (!active_device_list) {
1417                 status = -ENOMEM;
1418                 goto out;
1419         }
1420
1421         count = 0;
1422         for (i = 0; i < dod->package.count; i++) {
1423                 obj = &dod->package.elements[i];
1424
1425                 if (obj->type != ACPI_TYPE_INTEGER) {
1426                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1427                         active_device_list[i].value.int_val =
1428                             ACPI_VIDEO_HEAD_INVALID;
1429                 }
1430                 active_device_list[i].value.int_val = obj->integer.value;
1431                 active_device_list[i].bind_info = NULL;
1432                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1433                                   (int)obj->integer.value));
1434                 count++;
1435         }
1436         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1437
1438         kfree(video->attached_array);
1439
1440         video->attached_array = active_device_list;
1441         video->attached_count = count;
1442       out:
1443         kfree(buffer.pointer);
1444         return status;
1445 }
1446
1447 /*
1448  *  Arg:
1449  *      video   : video bus device
1450  *      event   : Nontify Event
1451  *
1452  *  Return:
1453  *      < 0     : error
1454  *
1455  *      1. Find out the current active output device.
1456  *      2. Identify the next output device to switch
1457  *      3. call _DSS to do actual switch.
1458  */
1459
1460 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1461 {
1462         struct list_head *node, *next;
1463         struct acpi_video_device *dev = NULL;
1464         struct acpi_video_device *dev_next = NULL;
1465         struct acpi_video_device *dev_prev = NULL;
1466         unsigned long state;
1467         int status = 0;
1468
1469
1470         list_for_each_safe(node, next, &video->video_device_list) {
1471                 dev = container_of(node, struct acpi_video_device, entry);
1472                 status = acpi_video_device_get_state(dev, &state);
1473                 if (state & 0x2) {
1474                         dev_next =
1475                             container_of(node->next, struct acpi_video_device,
1476                                          entry);
1477                         dev_prev =
1478                             container_of(node->prev, struct acpi_video_device,
1479                                          entry);
1480                         goto out;
1481                 }
1482         }
1483         dev_next = container_of(node->next, struct acpi_video_device, entry);
1484         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1485       out:
1486         switch (event) {
1487         case ACPI_VIDEO_NOTIFY_CYCLE:
1488         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1489                 acpi_video_device_set_state(dev, 0);
1490                 acpi_video_device_set_state(dev_next, 0x80000001);
1491                 break;
1492         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1493                 acpi_video_device_set_state(dev, 0);
1494                 acpi_video_device_set_state(dev_prev, 0x80000001);
1495         default:
1496                 break;
1497         }
1498
1499         return status;
1500 }
1501
1502 static int
1503 acpi_video_get_next_level(struct acpi_video_device *device,
1504                           u32 level_current, u32 event)
1505 {
1506         int min, max, min_above, max_below, i, l;
1507         max = max_below = 0;
1508         min = min_above = 255;
1509         for (i = 0; i < device->brightness->count; i++) {
1510                 l = device->brightness->levels[i];
1511                 if (l < min)
1512                         min = l;
1513                 if (l > max)
1514                         max = l;
1515                 if (l < min_above && l > level_current)
1516                         min_above = l;
1517                 if (l > max_below && l < level_current)
1518                         max_below = l;
1519         }
1520
1521         switch (event) {
1522         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1523                 return (level_current < max) ? min_above : min;
1524         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1525                 return (level_current < max) ? min_above : max;
1526         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1527                 return (level_current > min) ? max_below : min;
1528         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1529         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1530                 return 0;
1531         default:
1532                 return level_current;
1533         }
1534 }
1535
1536 static void
1537 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1538 {
1539         unsigned long level_current, level_next;
1540         acpi_video_device_lcd_get_level_current(device, &level_current);
1541         level_next = acpi_video_get_next_level(device, level_current, event);
1542         acpi_video_device_lcd_set_level(device, level_next);
1543 }
1544
1545 static int
1546 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1547                            struct acpi_device *device)
1548 {
1549         int status = 0;
1550         struct list_head *node, *next;
1551
1552
1553         acpi_video_device_enumerate(video);
1554
1555         list_for_each_safe(node, next, &device->children) {
1556                 struct acpi_device *dev =
1557                     list_entry(node, struct acpi_device, node);
1558
1559                 if (!dev)
1560                         continue;
1561
1562                 status = acpi_video_bus_get_one_device(dev, video);
1563                 if (ACPI_FAILURE(status)) {
1564                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1565                         continue;
1566                 }
1567
1568         }
1569         return status;
1570 }
1571
1572 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1573 {
1574         acpi_status status;
1575         struct acpi_video_bus *video;
1576
1577
1578         if (!device || !device->video)
1579                 return -ENOENT;
1580
1581         video = device->video;
1582
1583         down(&video->sem);
1584         list_del(&device->entry);
1585         up(&video->sem);
1586         acpi_video_device_remove_fs(device->dev);
1587
1588         status = acpi_remove_notify_handler(device->dev->handle,
1589                                             ACPI_DEVICE_NOTIFY,
1590                                             acpi_video_device_notify);
1591
1592         return 0;
1593 }
1594
1595 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1596 {
1597         int status;
1598         struct list_head *node, *next;
1599
1600
1601         list_for_each_safe(node, next, &video->video_device_list) {
1602                 struct acpi_video_device *data =
1603                     list_entry(node, struct acpi_video_device, entry);
1604                 if (!data)
1605                         continue;
1606
1607                 status = acpi_video_bus_put_one_device(data);
1608                 if (ACPI_FAILURE(status))
1609                         printk(KERN_WARNING PREFIX
1610                                "hhuuhhuu bug in acpi video driver.\n");
1611
1612                 if (data->brightness)
1613                         kfree(data->brightness->levels);
1614                 kfree(data->brightness);
1615                 kfree(data);
1616         }
1617
1618         return 0;
1619 }
1620
1621 /* acpi_video interface */
1622
1623 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1624 {
1625         return acpi_video_bus_DOS(video, 1, 0);
1626 }
1627
1628 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1629 {
1630         return acpi_video_bus_DOS(video, 0, 1);
1631 }
1632
1633 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1634 {
1635         struct acpi_video_bus *video = data;
1636         struct acpi_device *device = NULL;
1637
1638         printk("video bus notify\n");
1639
1640         if (!video)
1641                 return;
1642
1643         device = video->device;
1644
1645         switch (event) {
1646         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1647                                          * most likely via hotkey. */
1648                 acpi_bus_generate_event(device, event, 0);
1649                 break;
1650
1651         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1652                                          * connector. */
1653                 acpi_video_device_enumerate(video);
1654                 acpi_video_device_rebind(video);
1655                 acpi_video_switch_output(video, event);
1656                 acpi_bus_generate_event(device, event, 0);
1657                 break;
1658
1659         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1660         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1661         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1662                 acpi_video_switch_output(video, event);
1663                 acpi_bus_generate_event(device, event, 0);
1664                 break;
1665
1666         default:
1667                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1668                                   "Unsupported event [0x%x]\n", event));
1669                 break;
1670         }
1671
1672         return;
1673 }
1674
1675 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1676 {
1677         struct acpi_video_device *video_device = data;
1678         struct acpi_device *device = NULL;
1679
1680         if (!video_device)
1681                 return;
1682
1683         device = video_device->dev;
1684
1685         switch (event) {
1686         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1687         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1688                 acpi_bus_generate_event(device, event, 0);
1689                 break;
1690         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1691         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1692         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1693         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1694         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1695                 acpi_video_switch_brightness(video_device, event);
1696                 acpi_bus_generate_event(device, event, 0);
1697                 break;
1698         default:
1699                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1700                                   "Unsupported event [0x%x]\n", event));
1701                 break;
1702         }
1703         return;
1704 }
1705
1706 static int acpi_video_bus_add(struct acpi_device *device)
1707 {
1708         int result = 0;
1709         acpi_status status = 0;
1710         struct acpi_video_bus *video = NULL;
1711
1712
1713         if (!device)
1714                 return -EINVAL;
1715
1716         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1717         if (!video)
1718                 return -ENOMEM;
1719
1720         video->device = device;
1721         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1722         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1723         acpi_driver_data(device) = video;
1724
1725         acpi_video_bus_find_cap(video);
1726         result = acpi_video_bus_check(video);
1727         if (result)
1728                 goto end;
1729
1730         result = acpi_video_bus_add_fs(device);
1731         if (result)
1732                 goto end;
1733
1734         init_MUTEX(&video->sem);
1735         INIT_LIST_HEAD(&video->video_device_list);
1736
1737         acpi_video_bus_get_devices(video, device);
1738         acpi_video_bus_start_devices(video);
1739
1740         status = acpi_install_notify_handler(device->handle,
1741                                              ACPI_DEVICE_NOTIFY,
1742                                              acpi_video_bus_notify, video);
1743         if (ACPI_FAILURE(status)) {
1744                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1745                                   "Error installing notify handler\n"));
1746                 acpi_video_bus_stop_devices(video);
1747                 acpi_video_bus_put_devices(video);
1748                 kfree(video->attached_array);
1749                 acpi_video_bus_remove_fs(device);
1750                 result = -ENODEV;
1751                 goto end;
1752         }
1753
1754         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1755                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1756                video->flags.multihead ? "yes" : "no",
1757                video->flags.rom ? "yes" : "no",
1758                video->flags.post ? "yes" : "no");
1759
1760       end:
1761         if (result)
1762                 kfree(video);
1763
1764         return result;
1765 }
1766
1767 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1768 {
1769         acpi_status status = 0;
1770         struct acpi_video_bus *video = NULL;
1771
1772
1773         if (!device || !acpi_driver_data(device))
1774                 return -EINVAL;
1775
1776         video = acpi_driver_data(device);
1777
1778         acpi_video_bus_stop_devices(video);
1779
1780         status = acpi_remove_notify_handler(video->device->handle,
1781                                             ACPI_DEVICE_NOTIFY,
1782                                             acpi_video_bus_notify);
1783
1784         acpi_video_bus_put_devices(video);
1785         acpi_video_bus_remove_fs(device);
1786
1787         kfree(video->attached_array);
1788         kfree(video);
1789
1790         return 0;
1791 }
1792
1793 static int
1794 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1795 {
1796         acpi_handle h_dummy1;
1797         acpi_handle h_dummy2;
1798         acpi_handle h_dummy3;
1799
1800
1801         if (!device || !driver)
1802                 return -EINVAL;
1803
1804         /* Since there is no HID, CID for ACPI Video drivers, we have
1805          * to check well known required nodes for each feature we support.
1806          */
1807
1808         /* Does this device able to support video switching ? */
1809         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1810             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1811                 return 0;
1812
1813         /* Does this device able to retrieve a video ROM ? */
1814         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1815                 return 0;
1816
1817         /* Does this device able to configure which video head to be POSTed ? */
1818         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1819             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1820             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1821                 return 0;
1822
1823         return -ENODEV;
1824 }
1825
1826 static int __init acpi_video_init(void)
1827 {
1828         int result = 0;
1829
1830
1831         /*
1832            acpi_dbg_level = 0xFFFFFFFF;
1833            acpi_dbg_layer = 0x08000000;
1834          */
1835
1836         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1837         if (!acpi_video_dir)
1838                 return -ENODEV;
1839         acpi_video_dir->owner = THIS_MODULE;
1840
1841         result = acpi_bus_register_driver(&acpi_video_bus);
1842         if (result < 0) {
1843                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1844                 return -ENODEV;
1845         }
1846
1847         return 0;
1848 }
1849
1850 static void __exit acpi_video_exit(void)
1851 {
1852
1853         acpi_bus_unregister_driver(&acpi_video_bus);
1854
1855         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1856
1857         return;
1858 }
1859
1860 module_init(acpi_video_init);
1861 module_exit(acpi_video_exit);