drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  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 = (union acpi_object *)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 = kmalloc(sizeof(*br), GFP_KERNEL);
 537                 if (!br) {
 538                         printk(KERN_ERR "can't allocate memory\n");
 539                 } else {
 540                         memset(br, 0, sizeof(*br));
 541                         br->levels = kmalloc(obj->package.count *
 542                                              sizeof *(br->levels), GFP_KERNEL);
 543                         if (!br->levels)
 544                                 goto out;
 545
 546                         for (i = 0; i < obj->package.count; i++) {
 547                                 o = (union acpi_object *)&obj->package.
 548                                     elements[i];
 549                                 if (o->type != ACPI_TYPE_INTEGER) {
 550                                         printk(KERN_ERR PREFIX "Invalid data\n");
 551                                         continue;
 552                                 }
 553                                 br->levels[count] = (u32) o->integer.value;
 554                                 count++;
 555                         }
 556                       out:
 557                         if (count < 2) {
 558                                 kfree(br->levels);
 559                                 kfree(br);
 560                         } else {
 561                                 br->count = count;
 562                                 device->brightness = br;
 563                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 564                                                   "found %d brightness levels\n",
 565                                                   count));
 566                         }
 567                 }
 568         }
 569
 570         kfree(obj);
 571
 572         return;
 573 }
 574
 575 /*
 576  *  Arg:
 577  *      device  : video output device (VGA)
 578  *
 579  *  Return Value:
 580  *      None
 581  *
 582  *  Find out all required AML method defined under the video bus device.
 583  */
 584
 585 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 586 {
 587         acpi_handle h_dummy1;
 588
 589         memset(&video->cap, 0, 4);
 590         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 591                 video->cap._DOS = 1;
 592         }
 593         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 594                 video->cap._DOD = 1;
 595         }
 596         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 597                 video->cap._ROM = 1;
 598         }
 599         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 600                 video->cap._GPD = 1;
 601         }
 602         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 603                 video->cap._SPD = 1;
 604         }
 605         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 606                 video->cap._VPO = 1;
 607         }
 608 }
 609
 610 /*
 611  * Check whether the video bus device has required AML method to
 612  * support the desired features
 613  */
 614
 615 static int acpi_video_bus_check(struct acpi_video_bus *video)
 616 {
 617         acpi_status status = -ENOENT;
 618
 619
 620         if (!video)
 621                 return -EINVAL;
 622
 623         /* Since there is no HID, CID and so on for VGA driver, we have
 624          * to check well known required nodes.
 625          */
 626
 627         /* Does this device able to support video switching ? */
 628         if (video->cap._DOS) {
 629                 video->flags.multihead = 1;
 630                 status = 0;
 631         }
 632
 633         /* Does this device able to retrieve a retrieve a video ROM ? */
 634         if (video->cap._ROM) {
 635                 video->flags.rom = 1;
 636                 status = 0;
 637         }
 638
 639         /* Does this device able to configure which video device to POST ? */
 640         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 641                 video->flags.post = 1;
 642                 status = 0;
 643         }
 644
 645         return status;
 646 }
 647
 648 /* --------------------------------------------------------------------------
 649                               FS Interface (/proc)
 650    -------------------------------------------------------------------------- */
 651
 652 static struct proc_dir_entry *acpi_video_dir;
 653
 654 /* video devices */
 655
 656 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 657 {
 658         struct acpi_video_device *dev =
 659             (struct acpi_video_device *)seq->private;
 660
 661
 662         if (!dev)
 663                 goto end;
 664
 665         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 666         seq_printf(seq, "type:         ");
 667         if (dev->flags.crt)
 668                 seq_printf(seq, "CRT\n");
 669         else if (dev->flags.lcd)
 670                 seq_printf(seq, "LCD\n");
 671         else if (dev->flags.tvout)
 672                 seq_printf(seq, "TVOUT\n");
 673         else
 674                 seq_printf(seq, "UNKNOWN\n");
 675
 676         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 677
 678       end:
 679         return 0;
 680 }
 681
 682 static int
 683 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 684 {
 685         return single_open(file, acpi_video_device_info_seq_show,
 686                            PDE(inode)->data);
 687 }
 688
 689 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 690 {
 691         int status;
 692         struct acpi_video_device *dev =
 693             (struct acpi_video_device *)seq->private;
 694         unsigned long state;
 695
 696
 697         if (!dev)
 698                 goto end;
 699
 700         status = acpi_video_device_get_state(dev, &state);
 701         seq_printf(seq, "state:     ");
 702         if (ACPI_SUCCESS(status))
 703                 seq_printf(seq, "0x%02lx\n", state);
 704         else
 705                 seq_printf(seq, "<not supported>\n");
 706
 707         status = acpi_video_device_query(dev, &state);
 708         seq_printf(seq, "query:     ");
 709         if (ACPI_SUCCESS(status))
 710                 seq_printf(seq, "0x%02lx\n", state);
 711         else
 712                 seq_printf(seq, "<not supported>\n");
 713
 714       end:
 715         return 0;
 716 }
 717
 718 static int
 719 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 720 {
 721         return single_open(file, acpi_video_device_state_seq_show,
 722                            PDE(inode)->data);
 723 }
 724
 725 static ssize_t
 726 acpi_video_device_write_state(struct file *file,
 727                               const char __user * buffer,
 728                               size_t count, loff_t * data)
 729 {
 730         int status;
 731         struct seq_file *m = (struct seq_file *)file->private_data;
 732         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 733         char str[12] = { 0 };
 734         u32 state = 0;
 735
 736
 737         if (!dev || count + 1 > sizeof str)
 738                 return -EINVAL;
 739
 740         if (copy_from_user(str, buffer, count))
 741                 return -EFAULT;
 742
 743         str[count] = 0;
 744         state = simple_strtoul(str, NULL, 0);
 745         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 746
 747         status = acpi_video_device_set_state(dev, state);
 748
 749         if (status)
 750                 return -EFAULT;
 751
 752         return count;
 753 }
 754
 755 static int
 756 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 757 {
 758         struct acpi_video_device *dev =
 759             (struct acpi_video_device *)seq->private;
 760         int i;
 761
 762
 763         if (!dev || !dev->brightness) {
 764                 seq_printf(seq, "<not supported>\n");
 765                 return 0;
 766         }
 767
 768         seq_printf(seq, "levels: ");
 769         for (i = 0; i < dev->brightness->count; i++)
 770                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 771         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 772
 773         return 0;
 774 }
 775
 776 static int
 777 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 778 {
 779         return single_open(file, acpi_video_device_brightness_seq_show,
 780                            PDE(inode)->data);
 781 }
 782
 783 static ssize_t
 784 acpi_video_device_write_brightness(struct file *file,
 785                                    const char __user * buffer,
 786                                    size_t count, loff_t * data)
 787 {
 788         struct seq_file *m = (struct seq_file *)file->private_data;
 789         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 790         char str[4] = { 0 };
 791         unsigned int level = 0;
 792         int i;
 793
 794
 795         if (!dev || !dev->brightness || count + 1 > sizeof str)
 796                 return -EINVAL;
 797
 798         if (copy_from_user(str, buffer, count))
 799                 return -EFAULT;
 800
 801         str[count] = 0;
 802         level = simple_strtoul(str, NULL, 0);
 803
 804         if (level > 100)
 805                 return -EFAULT;
 806
 807         /* validate though the list of available levels */
 808         for (i = 0; i < dev->brightness->count; i++)
 809                 if (level == dev->brightness->levels[i]) {
 810                         if (ACPI_SUCCESS
 811                             (acpi_video_device_lcd_set_level(dev, level)))
 812                                 dev->brightness->curr = level;
 813                         break;
 814                 }
 815
 816         return count;
 817 }
 818
 819 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 820 {
 821         struct acpi_video_device *dev =
 822             (struct acpi_video_device *)seq->private;
 823         int status;
 824         int i;
 825         union acpi_object *edid = NULL;
 826
 827
 828         if (!dev)
 829                 goto out;
 830
 831         status = acpi_video_device_EDID(dev, &edid, 128);
 832         if (ACPI_FAILURE(status)) {
 833                 status = acpi_video_device_EDID(dev, &edid, 256);
 834         }
 835
 836         if (ACPI_FAILURE(status)) {
 837                 goto out;
 838         }
 839
 840         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 841                 for (i = 0; i < edid->buffer.length; i++)
 842                         seq_putc(seq, edid->buffer.pointer[i]);
 843         }
 844
 845       out:
 846         if (!edid)
 847                 seq_printf(seq, "<not supported>\n");
 848         else
 849                 kfree(edid);
 850
 851         return 0;
 852 }
 853
 854 static int
 855 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 856 {
 857         return single_open(file, acpi_video_device_EDID_seq_show,
 858                            PDE(inode)->data);
 859 }
 860
 861 static int acpi_video_device_add_fs(struct acpi_device *device)
 862 {
 863         struct proc_dir_entry *entry = NULL;
 864         struct acpi_video_device *vid_dev;
 865
 866
 867         if (!device)
 868                 return -ENODEV;
 869
 870         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 871         if (!vid_dev)
 872                 return -ENODEV;
 873
 874         if (!acpi_device_dir(device)) {
 875                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 876                                                      vid_dev->video->dir);
 877                 if (!acpi_device_dir(device))
 878                         return -ENODEV;
 879                 acpi_device_dir(device)->owner = THIS_MODULE;
 880         }
 881
 882         /* 'info' [R] */
 883         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 884         if (!entry)
 885                 return -ENODEV;
 886         else {
 887                 entry->proc_fops = &acpi_video_device_info_fops;
 888                 entry->data = acpi_driver_data(device);
 889                 entry->owner = THIS_MODULE;
 890         }
 891
 892         /* 'state' [R/W] */
 893         entry =
 894             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 895                               acpi_device_dir(device));
 896         if (!entry)
 897                 return -ENODEV;
 898         else {
 899                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 900                 entry->proc_fops = &acpi_video_device_state_fops;
 901                 entry->data = acpi_driver_data(device);
 902                 entry->owner = THIS_MODULE;
 903         }
 904
 905         /* 'brightness' [R/W] */
 906         entry =
 907             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 908                               acpi_device_dir(device));
 909         if (!entry)
 910                 return -ENODEV;
 911         else {
 912                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 913                 entry->proc_fops = &acpi_video_device_brightness_fops;
 914                 entry->data = acpi_driver_data(device);
 915                 entry->owner = THIS_MODULE;
 916         }
 917
 918         /* 'EDID' [R] */
 919         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 920         if (!entry)
 921                 return -ENODEV;
 922         else {
 923                 entry->proc_fops = &acpi_video_device_EDID_fops;
 924                 entry->data = acpi_driver_data(device);
 925                 entry->owner = THIS_MODULE;
 926         }
 927
 928         return 0;
 929 }
 930
 931 static int acpi_video_device_remove_fs(struct acpi_device *device)
 932 {
 933         struct acpi_video_device *vid_dev;
 934
 935         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 936         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 937                 return -ENODEV;
 938
 939         if (acpi_device_dir(device)) {
 940                 remove_proc_entry("info", acpi_device_dir(device));
 941                 remove_proc_entry("state", acpi_device_dir(device));
 942                 remove_proc_entry("brightness", acpi_device_dir(device));
 943                 remove_proc_entry("EDID", acpi_device_dir(device));
 944                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
 945                 acpi_device_dir(device) = NULL;
 946         }
 947
 948         return 0;
 949 }
 950
 951 /* video bus */
 952 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
 953 {
 954         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 955
 956
 957         if (!video)
 958                 goto end;
 959
 960         seq_printf(seq, "Switching heads:              %s\n",
 961                    video->flags.multihead ? "yes" : "no");
 962         seq_printf(seq, "Video ROM:                    %s\n",
 963                    video->flags.rom ? "yes" : "no");
 964         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
 965                    video->flags.post ? "yes" : "no");
 966
 967       end:
 968         return 0;
 969 }
 970
 971 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
 972 {
 973         return single_open(file, acpi_video_bus_info_seq_show,
 974                            PDE(inode)->data);
 975 }
 976
 977 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
 978 {
 979         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 980
 981
 982         if (!video)
 983                 goto end;
 984
 985         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
 986         seq_printf(seq, "<TODO>\n");
 987
 988       end:
 989         return 0;
 990 }
 991
 992 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
 993 {
 994         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
 995 }
 996
 997 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
 998 {
 999         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1000         unsigned long options;
1001         int status;
1002
1003
1004         if (!video)
1005                 goto end;
1006
1007         status = acpi_video_bus_POST_options(video, &options);
1008         if (ACPI_SUCCESS(status)) {
1009                 if (!(options & 1)) {
1010                         printk(KERN_WARNING PREFIX
1011                                "The motherboard VGA device is not listed as a possible POST device.\n");
1012                         printk(KERN_WARNING PREFIX
1013                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1014                 }
1015                 printk("%lx\n", options);
1016                 seq_printf(seq, "can POST: <intgrated video>");
1017                 if (options & 2)
1018                         seq_printf(seq, " <PCI video>");
1019                 if (options & 4)
1020                         seq_printf(seq, " <AGP video>");
1021                 seq_putc(seq, '\n');
1022         } else
1023                 seq_printf(seq, "<not supported>\n");
1024       end:
1025         return 0;
1026 }
1027
1028 static int
1029 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1030 {
1031         return single_open(file, acpi_video_bus_POST_info_seq_show,
1032                            PDE(inode)->data);
1033 }
1034
1035 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1036 {
1037         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1038         int status;
1039         unsigned long id;
1040
1041
1042         if (!video)
1043                 goto end;
1044
1045         status = acpi_video_bus_get_POST(video, &id);
1046         if (!ACPI_SUCCESS(status)) {
1047                 seq_printf(seq, "<not supported>\n");
1048                 goto end;
1049         }
1050         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1051
1052       end:
1053         return 0;
1054 }
1055
1056 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1057 {
1058         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1059
1060
1061         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1062
1063         return 0;
1064 }
1065
1066 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1067 {
1068         return single_open(file, acpi_video_bus_POST_seq_show,
1069                            PDE(inode)->data);
1070 }
1071
1072 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1073 {
1074         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1075 }
1076
1077 static ssize_t
1078 acpi_video_bus_write_POST(struct file *file,
1079                           const char __user * buffer,
1080                           size_t count, loff_t * data)
1081 {
1082         int status;
1083         struct seq_file *m = (struct seq_file *)file->private_data;
1084         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1085         char str[12] = { 0 };
1086         unsigned long opt, options;
1087
1088
1089         if (!video || count + 1 > sizeof str)
1090                 return -EINVAL;
1091
1092         status = acpi_video_bus_POST_options(video, &options);
1093         if (!ACPI_SUCCESS(status))
1094                 return -EINVAL;
1095
1096         if (copy_from_user(str, buffer, count))
1097                 return -EFAULT;
1098
1099         str[count] = 0;
1100         opt = strtoul(str, NULL, 0);
1101         if (opt > 3)
1102                 return -EFAULT;
1103
1104         /* just in case an OEM 'forget' the motherboard... */
1105         options |= 1;
1106
1107         if (options & (1ul << opt)) {
1108                 status = acpi_video_bus_set_POST(video, opt);
1109                 if (!ACPI_SUCCESS(status))
1110                         return -EFAULT;
1111
1112         }
1113
1114         return count;
1115 }
1116
1117 static ssize_t
1118 acpi_video_bus_write_DOS(struct file *file,
1119                          const char __user * buffer,
1120                          size_t count, loff_t * data)
1121 {
1122         int status;
1123         struct seq_file *m = (struct seq_file *)file->private_data;
1124         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1125         char str[12] = { 0 };
1126         unsigned long opt;
1127
1128
1129         if (!video || count + 1 > sizeof str)
1130                 return -EINVAL;
1131
1132         if (copy_from_user(str, buffer, count))
1133                 return -EFAULT;
1134
1135         str[count] = 0;
1136         opt = strtoul(str, NULL, 0);
1137         if (opt > 7)
1138                 return -EFAULT;
1139
1140         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1141
1142         if (!ACPI_SUCCESS(status))
1143                 return -EFAULT;
1144
1145         return count;
1146 }
1147
1148 static int acpi_video_bus_add_fs(struct acpi_device *device)
1149 {
1150         struct proc_dir_entry *entry = NULL;
1151         struct acpi_video_bus *video;
1152
1153
1154         video = (struct acpi_video_bus *)acpi_driver_data(device);
1155
1156         if (!acpi_device_dir(device)) {
1157                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1158                                                      acpi_video_dir);
1159                 if (!acpi_device_dir(device))
1160                         return -ENODEV;
1161                 video->dir = acpi_device_dir(device);
1162                 acpi_device_dir(device)->owner = THIS_MODULE;
1163         }
1164
1165         /* 'info' [R] */
1166         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1167         if (!entry)
1168                 return -ENODEV;
1169         else {
1170                 entry->proc_fops = &acpi_video_bus_info_fops;
1171                 entry->data = acpi_driver_data(device);
1172                 entry->owner = THIS_MODULE;
1173         }
1174
1175         /* 'ROM' [R] */
1176         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1177         if (!entry)
1178                 return -ENODEV;
1179         else {
1180                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1181                 entry->data = acpi_driver_data(device);
1182                 entry->owner = THIS_MODULE;
1183         }
1184
1185         /* 'POST_info' [R] */
1186         entry =
1187             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1188         if (!entry)
1189                 return -ENODEV;
1190         else {
1191                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1192                 entry->data = acpi_driver_data(device);
1193                 entry->owner = THIS_MODULE;
1194         }
1195
1196         /* 'POST' [R/W] */
1197         entry =
1198             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1199                               acpi_device_dir(device));
1200         if (!entry)
1201                 return -ENODEV;
1202         else {
1203                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1204                 entry->proc_fops = &acpi_video_bus_POST_fops;
1205                 entry->data = acpi_driver_data(device);
1206                 entry->owner = THIS_MODULE;
1207         }
1208
1209         /* 'DOS' [R/W] */
1210         entry =
1211             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1212                               acpi_device_dir(device));
1213         if (!entry)
1214                 return -ENODEV;
1215         else {
1216                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1217                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1218                 entry->data = acpi_driver_data(device);
1219                 entry->owner = THIS_MODULE;
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1226 {
1227         struct acpi_video_bus *video;
1228
1229
1230         video = (struct acpi_video_bus *)acpi_driver_data(device);
1231
1232         if (acpi_device_dir(device)) {
1233                 remove_proc_entry("info", acpi_device_dir(device));
1234                 remove_proc_entry("ROM", acpi_device_dir(device));
1235                 remove_proc_entry("POST_info", acpi_device_dir(device));
1236                 remove_proc_entry("POST", acpi_device_dir(device));
1237                 remove_proc_entry("DOS", acpi_device_dir(device));
1238                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1239                 acpi_device_dir(device) = NULL;
1240         }
1241
1242         return 0;
1243 }
1244
1245 /* --------------------------------------------------------------------------
1246                                  Driver Interface
1247    -------------------------------------------------------------------------- */
1248
1249 /* device interface */
1250
1251 static int
1252 acpi_video_bus_get_one_device(struct acpi_device *device,
1253                               struct acpi_video_bus *video)
1254 {
1255         unsigned long device_id;
1256         int status;
1257         struct acpi_video_device *data;
1258
1259
1260         if (!device || !video)
1261                 return -EINVAL;
1262
1263         status =
1264             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1265         if (ACPI_SUCCESS(status)) {
1266
1267                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1268                 if (!data)
1269                         return -ENOMEM;
1270
1271                 memset(data, 0, sizeof(struct acpi_video_device));
1272
1273                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1274                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1275                 acpi_driver_data(device) = data;
1276
1277                 data->device_id = device_id;
1278                 data->video = video;
1279                 data->dev = device;
1280
1281                 switch (device_id & 0xffff) {
1282                 case 0x0100:
1283                         data->flags.crt = 1;
1284                         break;
1285                 case 0x0400:
1286                         data->flags.lcd = 1;
1287                         break;
1288                 case 0x0200:
1289                         data->flags.tvout = 1;
1290                         break;
1291                 default:
1292                         data->flags.unknown = 1;
1293                         break;
1294                 }
1295
1296                 acpi_video_device_bind(video, data);
1297                 acpi_video_device_find_cap(data);
1298
1299                 status = acpi_install_notify_handler(device->handle,
1300                                                      ACPI_DEVICE_NOTIFY,
1301                                                      acpi_video_device_notify,
1302                                                      data);
1303                 if (ACPI_FAILURE(status)) {
1304                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1305                                           "Error installing notify handler\n"));
1306                         if(data->brightness)
1307                                 kfree(data->brightness->levels);
1308                         kfree(data->brightness);
1309                         kfree(data);
1310                         return -ENODEV;
1311                 }
1312
1313                 down(&video->sem);
1314                 list_add_tail(&data->entry, &video->video_device_list);
1315                 up(&video->sem);
1316
1317                 acpi_video_device_add_fs(device);
1318
1319                 return 0;
1320         }
1321
1322         return -ENOENT;
1323 }
1324
1325 /*
1326  *  Arg:
1327  *      video   : video bus device
1328  *
1329  *  Return:
1330  *      none
1331  *
1332  *  Enumerate the video device list of the video bus,
1333  *  bind the ids with the corresponding video devices
1334  *  under the video bus.
1335  */
1336
1337 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1338 {
1339         struct list_head *node, *next;
1340         list_for_each_safe(node, next, &video->video_device_list) {
1341                 struct acpi_video_device *dev =
1342                     container_of(node, struct acpi_video_device, entry);
1343                 acpi_video_device_bind(video, dev);
1344         }
1345 }
1346
1347 /*
1348  *  Arg:
1349  *      video   : video bus device
1350  *      device  : video output device under the video
1351  *              bus
1352  *
1353  *  Return:
1354  *      none
1355  *
1356  *  Bind the ids with the corresponding video devices
1357  *  under the video bus.
1358  */
1359
1360 static void
1361 acpi_video_device_bind(struct acpi_video_bus *video,
1362                        struct acpi_video_device *device)
1363 {
1364         int i;
1365
1366 #define IDS_VAL(i) video->attached_array[i].value.int_val
1367 #define IDS_BIND(i) video->attached_array[i].bind_info
1368
1369         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1370              i < video->attached_count; i++) {
1371                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1372                         IDS_BIND(i) = device;
1373                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1374                 }
1375         }
1376 #undef IDS_VAL
1377 #undef IDS_BIND
1378 }
1379
1380 /*
1381  *  Arg:
1382  *      video   : video bus device
1383  *
1384  *  Return:
1385  *      < 0     : error
1386  *
1387  *  Call _DOD to enumerate all devices attached to display adapter
1388  *
1389  */
1390
1391 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1392 {
1393         int status;
1394         int count;
1395         int i;
1396         struct acpi_video_enumerated_device *active_device_list;
1397         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1398         union acpi_object *dod = NULL;
1399         union acpi_object *obj;
1400
1401         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1402         if (!ACPI_SUCCESS(status)) {
1403                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1404                 return status;
1405         }
1406
1407         dod = (union acpi_object *)buffer.pointer;
1408         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1409                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1410                 status = -EFAULT;
1411                 goto out;
1412         }
1413
1414         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1415                           dod->package.count));
1416
1417         active_device_list = kmalloc((1 +
1418                                       dod->package.count) *
1419                                      sizeof(struct
1420                                             acpi_video_enumerated_device),
1421                                      GFP_KERNEL);
1422
1423         if (!active_device_list) {
1424                 status = -ENOMEM;
1425                 goto out;
1426         }
1427
1428         count = 0;
1429         for (i = 0; i < dod->package.count; i++) {
1430                 obj = (union acpi_object *)&dod->package.elements[i];
1431
1432                 if (obj->type != ACPI_TYPE_INTEGER) {
1433                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1434                         active_device_list[i].value.int_val =
1435                             ACPI_VIDEO_HEAD_INVALID;
1436                 }
1437                 active_device_list[i].value.int_val = obj->integer.value;
1438                 active_device_list[i].bind_info = NULL;
1439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1440                                   (int)obj->integer.value));
1441                 count++;
1442         }
1443         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1444
1445         kfree(video->attached_array);
1446
1447         video->attached_array = active_device_list;
1448         video->attached_count = count;
1449       out:
1450         kfree(buffer.pointer);
1451         return status;
1452 }
1453
1454 /*
1455  *  Arg:
1456  *      video   : video bus device
1457  *      event   : Nontify Event
1458  *
1459  *  Return:
1460  *      < 0     : error
1461  *
1462  *      1. Find out the current active output device.
1463  *      2. Identify the next output device to switch
1464  *      3. call _DSS to do actual switch.
1465  */
1466
1467 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1468 {
1469         struct list_head *node, *next;
1470         struct acpi_video_device *dev = NULL;
1471         struct acpi_video_device *dev_next = NULL;
1472         struct acpi_video_device *dev_prev = NULL;
1473         unsigned long state;
1474         int status = 0;
1475
1476
1477         list_for_each_safe(node, next, &video->video_device_list) {
1478                 dev = container_of(node, struct acpi_video_device, entry);
1479                 status = acpi_video_device_get_state(dev, &state);
1480                 if (state & 0x2) {
1481                         dev_next =
1482                             container_of(node->next, struct acpi_video_device,
1483                                          entry);
1484                         dev_prev =
1485                             container_of(node->prev, struct acpi_video_device,
1486                                          entry);
1487                         goto out;
1488                 }
1489         }
1490         dev_next = container_of(node->next, struct acpi_video_device, entry);
1491         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1492       out:
1493         switch (event) {
1494         case ACPI_VIDEO_NOTIFY_CYCLE:
1495         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1496                 acpi_video_device_set_state(dev, 0);
1497                 acpi_video_device_set_state(dev_next, 0x80000001);
1498                 break;
1499         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1500                 acpi_video_device_set_state(dev, 0);
1501                 acpi_video_device_set_state(dev_prev, 0x80000001);
1502         default:
1503                 break;
1504         }
1505
1506         return status;
1507 }
1508
1509 static int
1510 acpi_video_get_next_level(struct acpi_video_device *device,
1511                           u32 level_current, u32 event)
1512 {
1513         int min, max, min_above, max_below, i, l;
1514         max = max_below = 0;
1515         min = min_above = 255;
1516         for (i = 0; i < device->brightness->count; i++) {
1517                 l = device->brightness->levels[i];
1518                 if (l < min)
1519                         min = l;
1520                 if (l > max)
1521                         max = l;
1522                 if (l < min_above && l > level_current)
1523                         min_above = l;
1524                 if (l > max_below && l < level_current)
1525                         max_below = l;
1526         }
1527
1528         switch (event) {
1529         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1530                 return (level_current < max) ? min_above : min;
1531         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1532                 return (level_current < max) ? min_above : max;
1533         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1534                 return (level_current > min) ? max_below : min;
1535         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1536         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1537                 return 0;
1538         default:
1539                 return level_current;
1540         }
1541 }
1542
1543 static void
1544 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1545 {
1546         unsigned long level_current, level_next;
1547         acpi_video_device_lcd_get_level_current(device, &level_current);
1548         level_next = acpi_video_get_next_level(device, level_current, event);
1549         acpi_video_device_lcd_set_level(device, level_next);
1550 }
1551
1552 static int
1553 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1554                            struct acpi_device *device)
1555 {
1556         int status = 0;
1557         struct list_head *node, *next;
1558
1559
1560         acpi_video_device_enumerate(video);
1561
1562         list_for_each_safe(node, next, &device->children) {
1563                 struct acpi_device *dev =
1564                     list_entry(node, struct acpi_device, node);
1565
1566                 if (!dev)
1567                         continue;
1568
1569                 status = acpi_video_bus_get_one_device(dev, video);
1570                 if (ACPI_FAILURE(status)) {
1571                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1572                         continue;
1573                 }
1574
1575         }
1576         return status;
1577 }
1578
1579 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1580 {
1581         acpi_status status;
1582         struct acpi_video_bus *video;
1583
1584
1585         if (!device || !device->video)
1586                 return -ENOENT;
1587
1588         video = device->video;
1589
1590         down(&video->sem);
1591         list_del(&device->entry);
1592         up(&video->sem);
1593         acpi_video_device_remove_fs(device->dev);
1594
1595         status = acpi_remove_notify_handler(device->dev->handle,
1596                                             ACPI_DEVICE_NOTIFY,
1597                                             acpi_video_device_notify);
1598
1599         return 0;
1600 }
1601
1602 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1603 {
1604         int status;
1605         struct list_head *node, *next;
1606
1607
1608         list_for_each_safe(node, next, &video->video_device_list) {
1609                 struct acpi_video_device *data =
1610                     list_entry(node, struct acpi_video_device, entry);
1611                 if (!data)
1612                         continue;
1613
1614                 status = acpi_video_bus_put_one_device(data);
1615                 if (ACPI_FAILURE(status))
1616                         printk(KERN_WARNING PREFIX
1617                                "hhuuhhuu bug in acpi video driver.\n");
1618
1619                 if (data->brightness)
1620                         kfree(data->brightness->levels);
1621                 kfree(data->brightness);
1622                 kfree(data);
1623         }
1624
1625         return 0;
1626 }
1627
1628 /* acpi_video interface */
1629
1630 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1631 {
1632         return acpi_video_bus_DOS(video, 1, 0);
1633 }
1634
1635 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1636 {
1637         return acpi_video_bus_DOS(video, 0, 1);
1638 }
1639
1640 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1641 {
1642         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1643         struct acpi_device *device = NULL;
1644
1645         printk("video bus notify\n");
1646
1647         if (!video)
1648                 return;
1649
1650         device = video->device;
1651
1652         switch (event) {
1653         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1654                                          * most likely via hotkey. */
1655                 acpi_bus_generate_event(device, event, 0);
1656                 break;
1657
1658         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1659                                          * connector. */
1660                 acpi_video_device_enumerate(video);
1661                 acpi_video_device_rebind(video);
1662                 acpi_video_switch_output(video, event);
1663                 acpi_bus_generate_event(device, event, 0);
1664                 break;
1665
1666         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1667         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1668         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1669                 acpi_video_switch_output(video, event);
1670                 acpi_bus_generate_event(device, event, 0);
1671                 break;
1672
1673         default:
1674                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1675                                   "Unsupported event [0x%x]\n", event));
1676                 break;
1677         }
1678
1679         return;
1680 }
1681
1682 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1683 {
1684         struct acpi_video_device *video_device =
1685             (struct acpi_video_device *)data;
1686         struct acpi_device *device = NULL;
1687
1688
1689         printk("video device notify\n");
1690         if (!video_device)
1691                 return;
1692
1693         device = video_device->dev;
1694
1695         switch (event) {
1696         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1697         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1698                 acpi_bus_generate_event(device, event, 0);
1699                 break;
1700         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1701         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1702         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1703         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1704         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1705                 acpi_video_switch_brightness(video_device, event);
1706                 acpi_bus_generate_event(device, event, 0);
1707                 break;
1708         default:
1709                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1710                                   "Unsupported event [0x%x]\n", event));
1711                 break;
1712         }
1713         return;
1714 }
1715
1716 static int acpi_video_bus_add(struct acpi_device *device)
1717 {
1718         int result = 0;
1719         acpi_status status = 0;
1720         struct acpi_video_bus *video = NULL;
1721
1722
1723         if (!device)
1724                 return -EINVAL;
1725
1726         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1727         if (!video)
1728                 return -ENOMEM;
1729         memset(video, 0, sizeof(struct acpi_video_bus));
1730
1731         video->device = device;
1732         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1733         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1734         acpi_driver_data(device) = video;
1735
1736         acpi_video_bus_find_cap(video);
1737         result = acpi_video_bus_check(video);
1738         if (result)
1739                 goto end;
1740
1741         result = acpi_video_bus_add_fs(device);
1742         if (result)
1743                 goto end;
1744
1745         init_MUTEX(&video->sem);
1746         INIT_LIST_HEAD(&video->video_device_list);
1747
1748         acpi_video_bus_get_devices(video, device);
1749         acpi_video_bus_start_devices(video);
1750
1751         status = acpi_install_notify_handler(device->handle,
1752                                              ACPI_DEVICE_NOTIFY,
1753                                              acpi_video_bus_notify, video);
1754         if (ACPI_FAILURE(status)) {
1755                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1756                                   "Error installing notify handler\n"));
1757                 acpi_video_bus_stop_devices(video);
1758                 acpi_video_bus_put_devices(video);
1759                 kfree(video->attached_array);
1760                 acpi_video_bus_remove_fs(device);
1761                 result = -ENODEV;
1762                 goto end;
1763         }
1764
1765         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1766                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1767                video->flags.multihead ? "yes" : "no",
1768                video->flags.rom ? "yes" : "no",
1769                video->flags.post ? "yes" : "no");
1770
1771       end:
1772         if (result)
1773                 kfree(video);
1774
1775         return result;
1776 }
1777
1778 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1779 {
1780         acpi_status status = 0;
1781         struct acpi_video_bus *video = NULL;
1782
1783
1784         if (!device || !acpi_driver_data(device))
1785                 return -EINVAL;
1786
1787         video = (struct acpi_video_bus *)acpi_driver_data(device);
1788
1789         acpi_video_bus_stop_devices(video);
1790
1791         status = acpi_remove_notify_handler(video->device->handle,
1792                                             ACPI_DEVICE_NOTIFY,
1793                                             acpi_video_bus_notify);
1794
1795         acpi_video_bus_put_devices(video);
1796         acpi_video_bus_remove_fs(device);
1797
1798         kfree(video->attached_array);
1799         kfree(video);
1800
1801         return 0;
1802 }
1803
1804 static int
1805 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1806 {
1807         acpi_handle h_dummy1;
1808         acpi_handle h_dummy2;
1809         acpi_handle h_dummy3;
1810
1811
1812         if (!device || !driver)
1813                 return -EINVAL;
1814
1815         /* Since there is no HID, CID for ACPI Video drivers, we have
1816          * to check well known required nodes for each feature we support.
1817          */
1818
1819         /* Does this device able to support video switching ? */
1820         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1821             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1822                 return 0;
1823
1824         /* Does this device able to retrieve a video ROM ? */
1825         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1826                 return 0;
1827
1828         /* Does this device able to configure which video head to be POSTed ? */
1829         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1830             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1831             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1832                 return 0;
1833
1834         return -ENODEV;
1835 }
1836
1837 static int __init acpi_video_init(void)
1838 {
1839         int result = 0;
1840
1841
1842         /*
1843            acpi_dbg_level = 0xFFFFFFFF;
1844            acpi_dbg_layer = 0x08000000;
1845          */
1846
1847         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1848         if (!acpi_video_dir)
1849                 return -ENODEV;
1850         acpi_video_dir->owner = THIS_MODULE;
1851
1852         result = acpi_bus_register_driver(&acpi_video_bus);
1853         if (result < 0) {
1854                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1855                 return -ENODEV;
1856         }
1857
1858         return 0;
1859 }
1860
1861 static void __exit acpi_video_exit(void)
1862 {
1863
1864         acpi_bus_unregister_driver(&acpi_video_bus);
1865
1866         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1867
1868         return;
1869 }
1870
1871 module_init(acpi_video_init);
1872 module_exit(acpi_video_exit);