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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/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_VIDEO_CLASS                "video"
  48 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  49 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  50 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  51 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  52 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  55
  56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  61
  62 #define MAX_NAME_LEN    20
  63
  64 #define ACPI_VIDEO_DISPLAY_CRT  1
  65 #define ACPI_VIDEO_DISPLAY_TV   2
  66 #define ACPI_VIDEO_DISPLAY_DVI  3
  67 #define ACPI_VIDEO_DISPLAY_LCD  4
  68
  69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  70 ACPI_MODULE_NAME("video");
  71
  72 MODULE_AUTHOR("Bruno Ducrot");
  73 MODULE_DESCRIPTION("ACPI Video Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int brightness_switch_enabled = 1;
  77 module_param(brightness_switch_enabled, bool, 0644);
  78
  79 static int acpi_video_bus_add(struct acpi_device *device);
  80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  81 static int acpi_video_resume(struct acpi_device *device);
  82
  83 static const struct acpi_device_id video_device_ids[] = {
  84         {ACPI_VIDEO_HID, 0},
  85         {"", 0},
  86 };
  87 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  88
  89 static struct acpi_driver acpi_video_bus = {
  90         .name = "video",
  91         .class = ACPI_VIDEO_CLASS,
  92         .ids = video_device_ids,
  93         .ops = {
  94                 .add = acpi_video_bus_add,
  95                 .remove = acpi_video_bus_remove,
  96                 .resume = acpi_video_resume,
  97                 },
  98 };
  99
 100 struct acpi_video_bus_flags {
 101         u8 multihead:1;         /* can switch video heads */
 102         u8 rom:1;               /* can retrieve a video rom */
 103         u8 post:1;              /* can configure the head to */
 104         u8 reserved:5;
 105 };
 106
 107 struct acpi_video_bus_cap {
 108         u8 _DOS:1;              /*Enable/Disable output switching */
 109         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 110         u8 _ROM:1;              /*Get ROM Data */
 111         u8 _GPD:1;              /*Get POST Device */
 112         u8 _SPD:1;              /*Set POST Device */
 113         u8 _VPO:1;              /*Video POST Options */
 114         u8 reserved:2;
 115 };
 116
 117 struct acpi_video_device_attrib {
 118         u32 display_index:4;    /* A zero-based instance of the Display */
 119         u32 display_port_attachment:4;  /*This field differentiates the display type */
 120         u32 display_type:4;     /*Describe the specific type in use */
 121         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 122         u32 bios_can_detect:1;  /*BIOS can detect the device */
 123         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 124                                    the VGA device. */
 125         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 126         u32 reserved:10;        /*Must be 0 */
 127         u32 device_id_scheme:1; /*Device ID Scheme */
 128 };
 129
 130 struct acpi_video_enumerated_device {
 131         union {
 132                 u32 int_val;
 133                 struct acpi_video_device_attrib attrib;
 134         } value;
 135         struct acpi_video_device *bind_info;
 136 };
 137
 138 struct acpi_video_bus {
 139         struct acpi_device *device;
 140         u8 dos_setting;
 141         struct acpi_video_enumerated_device *attached_array;
 142         u8 attached_count;
 143         struct acpi_video_bus_cap cap;
 144         struct acpi_video_bus_flags flags;
 145         struct list_head video_device_list;
 146         struct mutex device_list_lock;  /* protects video_device_list */
 147         struct proc_dir_entry *dir;
 148         struct input_dev *input;
 149         char phys[32];  /* for input device */
 150 };
 151
 152 struct acpi_video_device_flags {
 153         u8 crt:1;
 154         u8 lcd:1;
 155         u8 tvout:1;
 156         u8 dvi:1;
 157         u8 bios:1;
 158         u8 unknown:1;
 159         u8 reserved:2;
 160 };
 161
 162 struct acpi_video_device_cap {
 163         u8 _ADR:1;              /*Return the unique ID */
 164         u8 _BCL:1;              /*Query list of brightness control levels supported */
 165         u8 _BCM:1;              /*Set the brightness level */
 166         u8 _BQC:1;              /* Get current brightness level */
 167         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 168         u8 _DDC:1;              /*Return the EDID for this device */
 169         u8 _DCS:1;              /*Return status of output device */
 170         u8 _DGS:1;              /*Query graphics state */
 171         u8 _DSS:1;              /*Device state set */
 172 };
 173
 174 struct acpi_video_brightness_flags {
 175         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 176         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 177         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 178         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 179         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 180 };
 181
 182 struct acpi_video_device_brightness {
 183         int curr;
 184         int count;
 185         int *levels;
 186         struct acpi_video_brightness_flags flags;
 187 };
 188
 189 struct acpi_video_device {
 190         unsigned long device_id;
 191         struct acpi_video_device_flags flags;
 192         struct acpi_video_device_cap cap;
 193         struct list_head entry;
 194         struct acpi_video_bus *video;
 195         struct acpi_device *dev;
 196         struct acpi_video_device_brightness *brightness;
 197         struct backlight_device *backlight;
 198         struct thermal_cooling_device *cdev;
 199         struct output_device *output_dev;
 200 };
 201
 202 /* bus */
 203 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 204 static const struct file_operations acpi_video_bus_info_fops = {
 205         .owner = THIS_MODULE,
 206         .open = acpi_video_bus_info_open_fs,
 207         .read = seq_read,
 208         .llseek = seq_lseek,
 209         .release = single_release,
 210 };
 211
 212 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 213 static const struct file_operations acpi_video_bus_ROM_fops = {
 214         .owner = THIS_MODULE,
 215         .open = acpi_video_bus_ROM_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 222                                             struct file *file);
 223 static const struct file_operations acpi_video_bus_POST_info_fops = {
 224         .owner = THIS_MODULE,
 225         .open = acpi_video_bus_POST_info_open_fs,
 226         .read = seq_read,
 227         .llseek = seq_lseek,
 228         .release = single_release,
 229 };
 230
 231 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 232 static ssize_t acpi_video_bus_write_POST(struct file *file,
 233         const char __user *buffer, size_t count, loff_t *data);
 234 static const struct file_operations acpi_video_bus_POST_fops = {
 235         .owner = THIS_MODULE,
 236         .open = acpi_video_bus_POST_open_fs,
 237         .read = seq_read,
 238         .write = acpi_video_bus_write_POST,
 239         .llseek = seq_lseek,
 240         .release = single_release,
 241 };
 242
 243 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 244 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 245         const char __user *buffer, size_t count, loff_t *data);
 246 static const struct file_operations acpi_video_bus_DOS_fops = {
 247         .owner = THIS_MODULE,
 248         .open = acpi_video_bus_DOS_open_fs,
 249         .read = seq_read,
 250         .write = acpi_video_bus_write_DOS,
 251         .llseek = seq_lseek,
 252         .release = single_release,
 253 };
 254
 255 /* device */
 256 static int acpi_video_device_info_open_fs(struct inode *inode,
 257                                           struct file *file);
 258 static const struct file_operations acpi_video_device_info_fops = {
 259         .owner = THIS_MODULE,
 260         .open = acpi_video_device_info_open_fs,
 261         .read = seq_read,
 262         .llseek = seq_lseek,
 263         .release = single_release,
 264 };
 265
 266 static int acpi_video_device_state_open_fs(struct inode *inode,
 267                                            struct file *file);
 268 static ssize_t acpi_video_device_write_state(struct file *file,
 269         const char __user *buffer, size_t count, loff_t *data);
 270 static const struct file_operations acpi_video_device_state_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_state_open_fs,
 273         .read = seq_read,
 274         .write = acpi_video_device_write_state,
 275         .llseek = seq_lseek,
 276         .release = single_release,
 277 };
 278
 279 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 280                                                 struct file *file);
 281 static ssize_t acpi_video_device_write_brightness(struct file *file,
 282         const char __user *buffer, size_t count, loff_t *data);
 283 static struct file_operations acpi_video_device_brightness_fops = {
 284         .owner = THIS_MODULE,
 285         .open = acpi_video_device_brightness_open_fs,
 286         .read = seq_read,
 287         .write = acpi_video_device_write_brightness,
 288         .llseek = seq_lseek,
 289         .release = single_release,
 290 };
 291
 292 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 293                                           struct file *file);
 294 static const struct file_operations acpi_video_device_EDID_fops = {
 295         .owner = THIS_MODULE,
 296         .open = acpi_video_device_EDID_open_fs,
 297         .read = seq_read,
 298         .llseek = seq_lseek,
 299         .release = single_release,
 300 };
 301
 302 static const char device_decode[][30] = {
 303         "motherboard VGA device",
 304         "PCI VGA device",
 305         "AGP VGA device",
 306         "UNKNOWN",
 307 };
 308
 309 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 310 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 311 static void acpi_video_device_bind(struct acpi_video_bus *video,
 312                                    struct acpi_video_device *device);
 313 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 314 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 315                         int level);
 316 static int acpi_video_device_lcd_get_level_current(
 317                         struct acpi_video_device *device,
 318                         unsigned long long *level);
 319 static int acpi_video_get_next_level(struct acpi_video_device *device,
 320                                      u32 level_current, u32 event);
 321 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 322                                          int event);
 323 static int acpi_video_device_get_state(struct acpi_video_device *device,
 324                             unsigned long long *state);
 325 static int acpi_video_output_get(struct output_device *od);
 326 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 327
 328 /*backlight device sysfs support*/
 329 static int acpi_video_get_brightness(struct backlight_device *bd)
 330 {
 331         unsigned long long cur_level;
 332         int i;
 333         struct acpi_video_device *vd =
 334                 (struct acpi_video_device *)bl_get_data(bd);
 335
 336         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 337                 return -EINVAL;
 338         for (i = 2; i < vd->brightness->count; i++) {
 339                 if (vd->brightness->levels[i] == cur_level)
 340                         /* The first two entries are special - see page 575
 341                            of the ACPI spec 3.0 */
 342                         return i-2;
 343         }
 344         return 0;
 345 }
 346
 347 static int acpi_video_set_brightness(struct backlight_device *bd)
 348 {
 349         int request_level = bd->props.brightness + 2;
 350         struct acpi_video_device *vd =
 351                 (struct acpi_video_device *)bl_get_data(bd);
 352
 353         return acpi_video_device_lcd_set_level(vd,
 354                                 vd->brightness->levels[request_level]);
 355 }
 356
 357 static struct backlight_ops acpi_backlight_ops = {
 358         .get_brightness = acpi_video_get_brightness,
 359         .update_status  = acpi_video_set_brightness,
 360 };
 361
 362 /*video output device sysfs support*/
 363 static int acpi_video_output_get(struct output_device *od)
 364 {
 365         unsigned long long state;
 366         struct acpi_video_device *vd =
 367                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 368         acpi_video_device_get_state(vd, &state);
 369         return (int)state;
 370 }
 371
 372 static int acpi_video_output_set(struct output_device *od)
 373 {
 374         unsigned long state = od->request_state;
 375         struct acpi_video_device *vd=
 376                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 377         return acpi_video_device_set_state(vd, state);
 378 }
 379
 380 static struct output_properties acpi_output_properties = {
 381         .set_state = acpi_video_output_set,
 382         .get_status = acpi_video_output_get,
 383 };
 384
 385
 386 /* thermal cooling device callbacks */
 387 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
 388                                long *state)
 389 {
 390         struct acpi_device *device = cdev->devdata;
 391         struct acpi_video_device *video = acpi_driver_data(device);
 392
 393         *state = video->brightness->count - 3;
 394         return 0;
 395 }
 396
 397 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
 398                                long *state)
 399 {
 400         struct acpi_device *device = cdev->devdata;
 401         struct acpi_video_device *video = acpi_driver_data(device);
 402         unsigned long long level;
 403         int offset;
 404
 405         if (acpi_video_device_lcd_get_level_current(video, &level))
 406                 return -EINVAL;
 407         for (offset = 2; offset < video->brightness->count; offset++)
 408                 if (level == video->brightness->levels[offset]) {
 409                         *state = video->brightness->count - offset - 1;
 410                         return 0;
 411                 }
 412
 413         return -EINVAL;
 414 }
 415
 416 static int
 417 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 418 {
 419         struct acpi_device *device = cdev->devdata;
 420         struct acpi_video_device *video = acpi_driver_data(device);
 421         int level;
 422
 423         if ( state >= video->brightness->count - 2)
 424                 return -EINVAL;
 425
 426         state = video->brightness->count - state;
 427         level = video->brightness->levels[state -1];
 428         return acpi_video_device_lcd_set_level(video, level);
 429 }
 430
 431 static struct thermal_cooling_device_ops video_cooling_ops = {
 432         .get_max_state = video_get_max_state,
 433         .get_cur_state = video_get_cur_state,
 434         .set_cur_state = video_set_cur_state,
 435 };
 436
 437 /* --------------------------------------------------------------------------
 438                                Video Management
 439    -------------------------------------------------------------------------- */
 440
 441 /* device */
 442
 443 static int
 444 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 445 {
 446         int status;
 447
 448         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 449
 450         return status;
 451 }
 452
 453 static int
 454 acpi_video_device_get_state(struct acpi_video_device *device,
 455                             unsigned long long *state)
 456 {
 457         int status;
 458
 459         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 460
 461         return status;
 462 }
 463
 464 static int
 465 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 466 {
 467         int status;
 468         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 469         struct acpi_object_list args = { 1, &arg0 };
 470         unsigned long long ret;
 471
 472
 473         arg0.integer.value = state;
 474         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 475
 476         return status;
 477 }
 478
 479 static int
 480 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 481                                    union acpi_object **levels)
 482 {
 483         int status;
 484         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 485         union acpi_object *obj;
 486
 487
 488         *levels = NULL;
 489
 490         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 491         if (!ACPI_SUCCESS(status))
 492                 return status;
 493         obj = (union acpi_object *)buffer.pointer;
 494         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 495                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 496                 status = -EFAULT;
 497                 goto err;
 498         }
 499
 500         *levels = obj;
 501
 502         return 0;
 503
 504       err:
 505         kfree(buffer.pointer);
 506
 507         return status;
 508 }
 509
 510 static int
 511 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 512 {
 513         int status;
 514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 515         struct acpi_object_list args = { 1, &arg0 };
 516         int state;
 517
 518         arg0.integer.value = level;
 519
 520         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 521                                       &args, NULL);
 522         if (ACPI_FAILURE(status)) {
 523                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 524                 return -EIO;
 525         }
 526
 527         device->brightness->curr = level;
 528         for (state = 2; state < device->brightness->count; state++)
 529                 if (level == device->brightness->levels[state]) {
 530                         if (device->backlight)
 531                                 device->backlight->props.brightness = state - 2;
 532                         return 0;
 533                 }
 534
 535         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 536         return -EINVAL;
 537 }
 538
 539 static int
 540 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 541                                         unsigned long long *level)
 542 {
 543         acpi_status status = AE_OK;
 544
 545         if (device->cap._BQC || device->cap._BCQ) {
 546                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 547
 548                 status = acpi_evaluate_integer(device->dev->handle, buf,
 549                                                 NULL, level);
 550                 if (ACPI_SUCCESS(status)) {
 551                         if (device->brightness->flags._BQC_use_index) {
 552                                 if (device->brightness->flags._BCL_reversed)
 553                                         *level = device->brightness->count
 554                                                                  - 3 - (*level);
 555                                 *level = device->brightness->levels[*level + 2];
 556
 557                         }
 558                         device->brightness->curr = *level;
 559                         return 0;
 560                 } else {
 561                         /* Fixme:
 562                          * should we return an error or ignore this failure?
 563                          * dev->brightness->curr is a cached value which stores
 564                          * the correct current backlight level in most cases.
 565                          * ACPI video backlight still works w/ buggy _BQC.
 566                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 567                          */
 568                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 569                         device->cap._BQC = device->cap._BCQ = 0;
 570                 }
 571         }
 572
 573         *level = device->brightness->curr;
 574         return 0;
 575 }
 576
 577 static int
 578 acpi_video_device_EDID(struct acpi_video_device *device,
 579                        union acpi_object **edid, ssize_t length)
 580 {
 581         int status;
 582         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 583         union acpi_object *obj;
 584         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 585         struct acpi_object_list args = { 1, &arg0 };
 586
 587
 588         *edid = NULL;
 589
 590         if (!device)
 591                 return -ENODEV;
 592         if (length == 128)
 593                 arg0.integer.value = 1;
 594         else if (length == 256)
 595                 arg0.integer.value = 2;
 596         else
 597                 return -EINVAL;
 598
 599         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 600         if (ACPI_FAILURE(status))
 601                 return -ENODEV;
 602
 603         obj = buffer.pointer;
 604
 605         if (obj && obj->type == ACPI_TYPE_BUFFER)
 606                 *edid = obj;
 607         else {
 608                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 609                 status = -EFAULT;
 610                 kfree(obj);
 611         }
 612
 613         return status;
 614 }
 615
 616 /* bus */
 617
 618 static int
 619 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 620 {
 621         int status;
 622         unsigned long long tmp;
 623         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 624         struct acpi_object_list args = { 1, &arg0 };
 625
 626
 627         arg0.integer.value = option;
 628
 629         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 630         if (ACPI_SUCCESS(status))
 631                 status = tmp ? (-EINVAL) : (AE_OK);
 632
 633         return status;
 634 }
 635
 636 static int
 637 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 638 {
 639         int status;
 640
 641         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 642
 643         return status;
 644 }
 645
 646 static int
 647 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 648                             unsigned long long *options)
 649 {
 650         int status;
 651
 652         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 653         *options &= 3;
 654
 655         return status;
 656 }
 657
 658 /*
 659  *  Arg:
 660  *      video           : video bus device pointer
 661  *      bios_flag       :
 662  *              0.      The system BIOS should NOT automatically switch(toggle)
 663  *                      the active display output.
 664  *              1.      The system BIOS should automatically switch (toggle) the
 665  *                      active display output. No switch event.
 666  *              2.      The _DGS value should be locked.
 667  *              3.      The system BIOS should not automatically switch (toggle) the
 668  *                      active display output, but instead generate the display switch
 669  *                      event notify code.
 670  *      lcd_flag        :
 671  *              0.      The system BIOS should automatically control the brightness level
 672  *                      of the LCD when the power changes from AC to DC
 673  *              1.      The system BIOS should NOT automatically control the brightness
 674  *                      level of the LCD when the power changes from AC to DC.
 675  * Return Value:
 676  *              -1      wrong arg.
 677  */
 678
 679 static int
 680 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 681 {
 682         acpi_integer status = 0;
 683         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 684         struct acpi_object_list args = { 1, &arg0 };
 685
 686
 687         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 688                 status = -1;
 689                 goto Failed;
 690         }
 691         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 692         video->dos_setting = arg0.integer.value;
 693         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 694
 695       Failed:
 696         return status;
 697 }
 698
 699 /*
 700  * Simple comparison function used to sort backlight levels.
 701  */
 702
 703 static int
 704 acpi_video_cmp_level(const void *a, const void *b)
 705 {
 706         return *(int *)a - *(int *)b;
 707 }
 708
 709 /*
 710  *  Arg:
 711  *      device  : video output device (LCD, CRT, ..)
 712  *
 713  *  Return Value:
 714  *      Maximum brightness level
 715  *
 716  *  Allocate and initialize device->brightness.
 717  */
 718
 719 static int
 720 acpi_video_init_brightness(struct acpi_video_device *device)
 721 {
 722         union acpi_object *obj = NULL;
 723         int i, max_level = 0, count = 0, level_ac_battery = 0;
 724         unsigned long long level, level_old;
 725         union acpi_object *o;
 726         struct acpi_video_device_brightness *br = NULL;
 727         int result = -EINVAL;
 728
 729         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 730                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 731                                                 "LCD brightness level\n"));
 732                 goto out;
 733         }
 734
 735         if (obj->package.count < 2)
 736                 goto out;
 737
 738         br = kzalloc(sizeof(*br), GFP_KERNEL);
 739         if (!br) {
 740                 printk(KERN_ERR "can't allocate memory\n");
 741                 result = -ENOMEM;
 742                 goto out;
 743         }
 744
 745         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 746                                 GFP_KERNEL);
 747         if (!br->levels) {
 748                 result = -ENOMEM;
 749                 goto out_free;
 750         }
 751
 752         for (i = 0; i < obj->package.count; i++) {
 753                 o = (union acpi_object *)&obj->package.elements[i];
 754                 if (o->type != ACPI_TYPE_INTEGER) {
 755                         printk(KERN_ERR PREFIX "Invalid data\n");
 756                         continue;
 757                 }
 758                 br->levels[count] = (u32) o->integer.value;
 759
 760                 if (br->levels[count] > max_level)
 761                         max_level = br->levels[count];
 762                 count++;
 763         }
 764
 765         /*
 766          * some buggy BIOS don't export the levels
 767          * when machine is on AC/Battery in _BCL package.
 768          * In this case, the first two elements in _BCL packages
 769          * are also supported brightness levels that OS should take care of.
 770          */
 771         for (i = 2; i < count; i++)
 772                 if (br->levels[i] == br->levels[0] ||
 773                     br->levels[i] == br->levels[1])
 774                         level_ac_battery++;
 775
 776         if (level_ac_battery < 2) {
 777                 level_ac_battery = 2 - level_ac_battery;
 778                 br->flags._BCL_no_ac_battery_levels = 1;
 779                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 780                         br->levels[i] = br->levels[i - level_ac_battery];
 781                 count += level_ac_battery;
 782         } else if (level_ac_battery > 2)
 783                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 784
 785         /* Check if the _BCL package is in a reversed order */
 786         if (max_level == br->levels[2]) {
 787                 br->flags._BCL_reversed = 1;
 788                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 789                         acpi_video_cmp_level, NULL);
 790         } else if (max_level != br->levels[count - 1])
 791                 ACPI_ERROR((AE_INFO,
 792                             "Found unordered _BCL package\n"));
 793
 794         br->count = count;
 795         device->brightness = br;
 796
 797         /* Check the input/output of _BQC/_BCL/_BCM */
 798         if ((max_level < 100) && (max_level <= (count - 2)))
 799                 br->flags._BCL_use_index = 1;
 800
 801         /*
 802          * _BCM is always consistent with _BCL,
 803          * at least for all the laptops we have ever seen.
 804          */
 805         br->flags._BCM_use_index = br->flags._BCL_use_index;
 806
 807         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 808         br->curr = max_level;
 809         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 810         if (result)
 811                 goto out_free_levels;
 812
 813         result = acpi_video_device_lcd_set_level(device, br->curr);
 814         if (result)
 815                 goto out_free_levels;
 816
 817         result = acpi_video_device_lcd_get_level_current(device, &level);
 818         if (result)
 819                 goto out_free_levels;
 820
 821         if ((level != level_old) && !br->flags._BCM_use_index) {
 822                 /* Note:
 823                  * This piece of code does not work correctly if the current
 824                  * brightness levels is 0.
 825                  * But I guess boxes that boot with such a dark screen are rare
 826                  * and no more code is needed to cover this specifial case.
 827                  */
 828
 829                 if (level_ac_battery != 2) {
 830                         /*
 831                          * For now, we don't support the _BCL like this:
 832                          * 16, 15, 0, 1, 2, 3, ..., 14, 15, 16
 833                          * because we may mess up the index returned by _BQC.
 834                          * Plus: we have not got a box like this.
 835                          */
 836                         ACPI_ERROR((AE_INFO, "_BCL not supported\n"));
 837                 }
 838                 br->flags._BQC_use_index = 1;
 839         }
 840
 841         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 842                           "found %d brightness levels\n", count - 2));
 843         kfree(obj);
 844         return result;
 845
 846 out_free_levels:
 847         kfree(br->levels);
 848 out_free:
 849         kfree(br);
 850 out:
 851         device->brightness = NULL;
 852         kfree(obj);
 853         return result;
 854 }
 855
 856 /*
 857  *  Arg:
 858  *      device  : video output device (LCD, CRT, ..)
 859  *
 860  *  Return Value:
 861  *      None
 862  *
 863  *  Find out all required AML methods defined under the output
 864  *  device.
 865  */
 866
 867 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 868 {
 869         acpi_handle h_dummy1;
 870
 871
 872         memset(&device->cap, 0, sizeof(device->cap));
 873
 874         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 875                 device->cap._ADR = 1;
 876         }
 877         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 878                 device->cap._BCL = 1;
 879         }
 880         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 881                 device->cap._BCM = 1;
 882         }
 883         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 884                 device->cap._BQC = 1;
 885         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 886                                 &h_dummy1))) {
 887                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 888                 device->cap._BCQ = 1;
 889         }
 890
 891         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 892                 device->cap._DDC = 1;
 893         }
 894         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 895                 device->cap._DCS = 1;
 896         }
 897         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 898                 device->cap._DGS = 1;
 899         }
 900         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 901                 device->cap._DSS = 1;
 902         }
 903
 904         if (acpi_video_backlight_support()) {
 905                 int result;
 906                 static int count = 0;
 907                 char *name;
 908
 909                 result = acpi_video_init_brightness(device);
 910                 if (result)
 911                         return;
 912                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 913                 if (!name)
 914                         return;
 915
 916                 sprintf(name, "acpi_video%d", count++);
 917                 device->backlight = backlight_device_register(name,
 918                         NULL, device, &acpi_backlight_ops);
 919                 device->backlight->props.max_brightness = device->brightness->count-3;
 920                 kfree(name);
 921
 922                 device->cdev = thermal_cooling_device_register("LCD",
 923                                         device->dev, &video_cooling_ops);
 924                 if (IS_ERR(device->cdev))
 925                         return;
 926
 927                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 928                          device->cdev->id);
 929                 result = sysfs_create_link(&device->dev->dev.kobj,
 930                                 &device->cdev->device.kobj,
 931                                 "thermal_cooling");
 932                 if (result)
 933                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 934                 result = sysfs_create_link(&device->cdev->device.kobj,
 935                                 &device->dev->dev.kobj, "device");
 936                 if (result)
 937                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 938
 939         }
 940
 941         if (acpi_video_display_switch_support()) {
 942
 943                 if (device->cap._DCS && device->cap._DSS) {
 944                         static int count;
 945                         char *name;
 946                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 947                         if (!name)
 948                                 return;
 949                         sprintf(name, "acpi_video%d", count++);
 950                         device->output_dev = video_output_register(name,
 951                                         NULL, device, &acpi_output_properties);
 952                         kfree(name);
 953                 }
 954         }
 955 }
 956
 957 /*
 958  *  Arg:
 959  *      device  : video output device (VGA)
 960  *
 961  *  Return Value:
 962  *      None
 963  *
 964  *  Find out all required AML methods defined under the video bus device.
 965  */
 966
 967 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 968 {
 969         acpi_handle h_dummy1;
 970
 971         memset(&video->cap, 0, sizeof(video->cap));
 972         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 973                 video->cap._DOS = 1;
 974         }
 975         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 976                 video->cap._DOD = 1;
 977         }
 978         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 979                 video->cap._ROM = 1;
 980         }
 981         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 982                 video->cap._GPD = 1;
 983         }
 984         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 985                 video->cap._SPD = 1;
 986         }
 987         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 988                 video->cap._VPO = 1;
 989         }
 990 }
 991
 992 /*
 993  * Check whether the video bus device has required AML method to
 994  * support the desired features
 995  */
 996
 997 static int acpi_video_bus_check(struct acpi_video_bus *video)
 998 {
 999         acpi_status status = -ENOENT;
1000         struct device *dev;
1001
1002         if (!video)
1003                 return -EINVAL;
1004
1005         dev = acpi_get_physical_pci_device(video->device->handle);
1006         if (!dev)
1007                 return -ENODEV;
1008         put_device(dev);
1009
1010         /* Since there is no HID, CID and so on for VGA driver, we have
1011          * to check well known required nodes.
1012          */
1013
1014         /* Does this device support video switching? */
1015         if (video->cap._DOS) {
1016                 video->flags.multihead = 1;
1017                 status = 0;
1018         }
1019
1020         /* Does this device support retrieving a video ROM? */
1021         if (video->cap._ROM) {
1022                 video->flags.rom = 1;
1023                 status = 0;
1024         }
1025
1026         /* Does this device support configuring which video device to POST? */
1027         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1028                 video->flags.post = 1;
1029                 status = 0;
1030         }
1031
1032         return status;
1033 }
1034
1035 /* --------------------------------------------------------------------------
1036                               FS Interface (/proc)
1037    -------------------------------------------------------------------------- */
1038
1039 static struct proc_dir_entry *acpi_video_dir;
1040
1041 /* video devices */
1042
1043 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1044 {
1045         struct acpi_video_device *dev = seq->private;
1046
1047
1048         if (!dev)
1049                 goto end;
1050
1051         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1052         seq_printf(seq, "type:         ");
1053         if (dev->flags.crt)
1054                 seq_printf(seq, "CRT\n");
1055         else if (dev->flags.lcd)
1056                 seq_printf(seq, "LCD\n");
1057         else if (dev->flags.tvout)
1058                 seq_printf(seq, "TVOUT\n");
1059         else if (dev->flags.dvi)
1060                 seq_printf(seq, "DVI\n");
1061         else
1062                 seq_printf(seq, "UNKNOWN\n");
1063
1064         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1065
1066       end:
1067         return 0;
1068 }
1069
1070 static int
1071 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1072 {
1073         return single_open(file, acpi_video_device_info_seq_show,
1074                            PDE(inode)->data);
1075 }
1076
1077 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1078 {
1079         int status;
1080         struct acpi_video_device *dev = seq->private;
1081         unsigned long long state;
1082
1083
1084         if (!dev)
1085                 goto end;
1086
1087         status = acpi_video_device_get_state(dev, &state);
1088         seq_printf(seq, "state:     ");
1089         if (ACPI_SUCCESS(status))
1090                 seq_printf(seq, "0x%02llx\n", state);
1091         else
1092                 seq_printf(seq, "<not supported>\n");
1093
1094         status = acpi_video_device_query(dev, &state);
1095         seq_printf(seq, "query:     ");
1096         if (ACPI_SUCCESS(status))
1097                 seq_printf(seq, "0x%02llx\n", state);
1098         else
1099                 seq_printf(seq, "<not supported>\n");
1100
1101       end:
1102         return 0;
1103 }
1104
1105 static int
1106 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1107 {
1108         return single_open(file, acpi_video_device_state_seq_show,
1109                            PDE(inode)->data);
1110 }
1111
1112 static ssize_t
1113 acpi_video_device_write_state(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_device *dev = m->private;
1120         char str[12] = { 0 };
1121         u32 state = 0;
1122
1123
1124         if (!dev || 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         state = simple_strtoul(str, NULL, 0);
1132         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1133
1134         status = acpi_video_device_set_state(dev, state);
1135
1136         if (status)
1137                 return -EFAULT;
1138
1139         return count;
1140 }
1141
1142 static int
1143 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1144 {
1145         struct acpi_video_device *dev = seq->private;
1146         int i;
1147
1148
1149         if (!dev || !dev->brightness) {
1150                 seq_printf(seq, "<not supported>\n");
1151                 return 0;
1152         }
1153
1154         seq_printf(seq, "levels: ");
1155         for (i = 2; i < dev->brightness->count; i++)
1156                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1157         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1158
1159         return 0;
1160 }
1161
1162 static int
1163 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1164 {
1165         return single_open(file, acpi_video_device_brightness_seq_show,
1166                            PDE(inode)->data);
1167 }
1168
1169 static ssize_t
1170 acpi_video_device_write_brightness(struct file *file,
1171                                    const char __user * buffer,
1172                                    size_t count, loff_t * data)
1173 {
1174         struct seq_file *m = file->private_data;
1175         struct acpi_video_device *dev = m->private;
1176         char str[5] = { 0 };
1177         unsigned int level = 0;
1178         int i;
1179
1180
1181         if (!dev || !dev->brightness || count + 1 > sizeof str)
1182                 return -EINVAL;
1183
1184         if (copy_from_user(str, buffer, count))
1185                 return -EFAULT;
1186
1187         str[count] = 0;
1188         level = simple_strtoul(str, NULL, 0);
1189
1190         if (level > 100)
1191                 return -EFAULT;
1192
1193         /* validate through the list of available levels */
1194         for (i = 2; i < dev->brightness->count; i++)
1195                 if (level == dev->brightness->levels[i]) {
1196                         if (!acpi_video_device_lcd_set_level(dev, level))
1197                                 return count;
1198                         break;
1199                 }
1200
1201         return -EINVAL;
1202 }
1203
1204 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1205 {
1206         struct acpi_video_device *dev = seq->private;
1207         int status;
1208         int i;
1209         union acpi_object *edid = NULL;
1210
1211
1212         if (!dev)
1213                 goto out;
1214
1215         status = acpi_video_device_EDID(dev, &edid, 128);
1216         if (ACPI_FAILURE(status)) {
1217                 status = acpi_video_device_EDID(dev, &edid, 256);
1218         }
1219
1220         if (ACPI_FAILURE(status)) {
1221                 goto out;
1222         }
1223
1224         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1225                 for (i = 0; i < edid->buffer.length; i++)
1226                         seq_putc(seq, edid->buffer.pointer[i]);
1227         }
1228
1229       out:
1230         if (!edid)
1231                 seq_printf(seq, "<not supported>\n");
1232         else
1233                 kfree(edid);
1234
1235         return 0;
1236 }
1237
1238 static int
1239 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1240 {
1241         return single_open(file, acpi_video_device_EDID_seq_show,
1242                            PDE(inode)->data);
1243 }
1244
1245 static int acpi_video_device_add_fs(struct acpi_device *device)
1246 {
1247         struct proc_dir_entry *entry, *device_dir;
1248         struct acpi_video_device *vid_dev;
1249
1250         vid_dev = acpi_driver_data(device);
1251         if (!vid_dev)
1252                 return -ENODEV;
1253
1254         device_dir = proc_mkdir(acpi_device_bid(device),
1255                                 vid_dev->video->dir);
1256         if (!device_dir)
1257                 return -ENOMEM;
1258
1259         /* 'info' [R] */
1260         entry = proc_create_data("info", S_IRUGO, device_dir,
1261                         &acpi_video_device_info_fops, acpi_driver_data(device));
1262         if (!entry)
1263                 goto err_remove_dir;
1264
1265         /* 'state' [R/W] */
1266         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1267                                  device_dir,
1268                                  &acpi_video_device_state_fops,
1269                                  acpi_driver_data(device));
1270         if (!entry)
1271                 goto err_remove_info;
1272
1273         /* 'brightness' [R/W] */
1274         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1275                                  device_dir,
1276                                  &acpi_video_device_brightness_fops,
1277                                  acpi_driver_data(device));
1278         if (!entry)
1279                 goto err_remove_state;
1280
1281         /* 'EDID' [R] */
1282         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1283                                  &acpi_video_device_EDID_fops,
1284                                  acpi_driver_data(device));
1285         if (!entry)
1286                 goto err_remove_brightness;
1287
1288         acpi_device_dir(device) = device_dir;
1289
1290         return 0;
1291
1292  err_remove_brightness:
1293         remove_proc_entry("brightness", device_dir);
1294  err_remove_state:
1295         remove_proc_entry("state", device_dir);
1296  err_remove_info:
1297         remove_proc_entry("info", device_dir);
1298  err_remove_dir:
1299         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1300         return -ENOMEM;
1301 }
1302
1303 static int acpi_video_device_remove_fs(struct acpi_device *device)
1304 {
1305         struct acpi_video_device *vid_dev;
1306         struct proc_dir_entry *device_dir;
1307
1308         vid_dev = acpi_driver_data(device);
1309         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1310                 return -ENODEV;
1311
1312         device_dir = acpi_device_dir(device);
1313         if (device_dir) {
1314                 remove_proc_entry("info", device_dir);
1315                 remove_proc_entry("state", device_dir);
1316                 remove_proc_entry("brightness", device_dir);
1317                 remove_proc_entry("EDID", device_dir);
1318                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1319                 acpi_device_dir(device) = NULL;
1320         }
1321
1322         return 0;
1323 }
1324
1325 /* video bus */
1326 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1327 {
1328         struct acpi_video_bus *video = seq->private;
1329
1330
1331         if (!video)
1332                 goto end;
1333
1334         seq_printf(seq, "Switching heads:              %s\n",
1335                    video->flags.multihead ? "yes" : "no");
1336         seq_printf(seq, "Video ROM:                    %s\n",
1337                    video->flags.rom ? "yes" : "no");
1338         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1339                    video->flags.post ? "yes" : "no");
1340
1341       end:
1342         return 0;
1343 }
1344
1345 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1346 {
1347         return single_open(file, acpi_video_bus_info_seq_show,
1348                            PDE(inode)->data);
1349 }
1350
1351 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1352 {
1353         struct acpi_video_bus *video = seq->private;
1354
1355
1356         if (!video)
1357                 goto end;
1358
1359         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1360         seq_printf(seq, "<TODO>\n");
1361
1362       end:
1363         return 0;
1364 }
1365
1366 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1367 {
1368         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1369 }
1370
1371 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1372 {
1373         struct acpi_video_bus *video = seq->private;
1374         unsigned long long options;
1375         int status;
1376
1377
1378         if (!video)
1379                 goto end;
1380
1381         status = acpi_video_bus_POST_options(video, &options);
1382         if (ACPI_SUCCESS(status)) {
1383                 if (!(options & 1)) {
1384                         printk(KERN_WARNING PREFIX
1385                                "The motherboard VGA device is not listed as a possible POST device.\n");
1386                         printk(KERN_WARNING PREFIX
1387                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1388                 }
1389                 printk(KERN_WARNING "%llx\n", options);
1390                 seq_printf(seq, "can POST: <integrated video>");
1391                 if (options & 2)
1392                         seq_printf(seq, " <PCI video>");
1393                 if (options & 4)
1394                         seq_printf(seq, " <AGP video>");
1395                 seq_putc(seq, '\n');
1396         } else
1397                 seq_printf(seq, "<not supported>\n");
1398       end:
1399         return 0;
1400 }
1401
1402 static int
1403 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1404 {
1405         return single_open(file, acpi_video_bus_POST_info_seq_show,
1406                            PDE(inode)->data);
1407 }
1408
1409 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1410 {
1411         struct acpi_video_bus *video = seq->private;
1412         int status;
1413         unsigned long long id;
1414
1415
1416         if (!video)
1417                 goto end;
1418
1419         status = acpi_video_bus_get_POST(video, &id);
1420         if (!ACPI_SUCCESS(status)) {
1421                 seq_printf(seq, "<not supported>\n");
1422                 goto end;
1423         }
1424         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1425
1426       end:
1427         return 0;
1428 }
1429
1430 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1431 {
1432         struct acpi_video_bus *video = seq->private;
1433
1434
1435         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1436
1437         return 0;
1438 }
1439
1440 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1441 {
1442         return single_open(file, acpi_video_bus_POST_seq_show,
1443                            PDE(inode)->data);
1444 }
1445
1446 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1447 {
1448         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1449 }
1450
1451 static ssize_t
1452 acpi_video_bus_write_POST(struct file *file,
1453                           const char __user * buffer,
1454                           size_t count, loff_t * data)
1455 {
1456         int status;
1457         struct seq_file *m = file->private_data;
1458         struct acpi_video_bus *video = m->private;
1459         char str[12] = { 0 };
1460         unsigned long long opt, options;
1461
1462
1463         if (!video || count + 1 > sizeof str)
1464                 return -EINVAL;
1465
1466         status = acpi_video_bus_POST_options(video, &options);
1467         if (!ACPI_SUCCESS(status))
1468                 return -EINVAL;
1469
1470         if (copy_from_user(str, buffer, count))
1471                 return -EFAULT;
1472
1473         str[count] = 0;
1474         opt = strtoul(str, NULL, 0);
1475         if (opt > 3)
1476                 return -EFAULT;
1477
1478         /* just in case an OEM 'forgot' the motherboard... */
1479         options |= 1;
1480
1481         if (options & (1ul << opt)) {
1482                 status = acpi_video_bus_set_POST(video, opt);
1483                 if (!ACPI_SUCCESS(status))
1484                         return -EFAULT;
1485
1486         }
1487
1488         return count;
1489 }
1490
1491 static ssize_t
1492 acpi_video_bus_write_DOS(struct file *file,
1493                          const char __user * buffer,
1494                          size_t count, loff_t * data)
1495 {
1496         int status;
1497         struct seq_file *m = file->private_data;
1498         struct acpi_video_bus *video = m->private;
1499         char str[12] = { 0 };
1500         unsigned long opt;
1501
1502
1503         if (!video || count + 1 > sizeof str)
1504                 return -EINVAL;
1505
1506         if (copy_from_user(str, buffer, count))
1507                 return -EFAULT;
1508
1509         str[count] = 0;
1510         opt = strtoul(str, NULL, 0);
1511         if (opt > 7)
1512                 return -EFAULT;
1513
1514         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1515
1516         if (!ACPI_SUCCESS(status))
1517                 return -EFAULT;
1518
1519         return count;
1520 }
1521
1522 static int acpi_video_bus_add_fs(struct acpi_device *device)
1523 {
1524         struct acpi_video_bus *video = acpi_driver_data(device);
1525         struct proc_dir_entry *device_dir;
1526         struct proc_dir_entry *entry;
1527
1528         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1529         if (!device_dir)
1530                 return -ENOMEM;
1531
1532         /* 'info' [R] */
1533         entry = proc_create_data("info", S_IRUGO, device_dir,
1534                                  &acpi_video_bus_info_fops,
1535                                  acpi_driver_data(device));
1536         if (!entry)
1537                 goto err_remove_dir;
1538
1539         /* 'ROM' [R] */
1540         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1541                                  &acpi_video_bus_ROM_fops,
1542                                  acpi_driver_data(device));
1543         if (!entry)
1544                 goto err_remove_info;
1545
1546         /* 'POST_info' [R] */
1547         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1548                                  &acpi_video_bus_POST_info_fops,
1549                                  acpi_driver_data(device));
1550         if (!entry)
1551                 goto err_remove_rom;
1552
1553         /* 'POST' [R/W] */
1554         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1555                                  device_dir,
1556                                  &acpi_video_bus_POST_fops,
1557                                  acpi_driver_data(device));
1558         if (!entry)
1559                 goto err_remove_post_info;
1560
1561         /* 'DOS' [R/W] */
1562         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1563                                  device_dir,
1564                                  &acpi_video_bus_DOS_fops,
1565                                  acpi_driver_data(device));
1566         if (!entry)
1567                 goto err_remove_post;
1568
1569         video->dir = acpi_device_dir(device) = device_dir;
1570         return 0;
1571
1572  err_remove_post:
1573         remove_proc_entry("POST", device_dir);
1574  err_remove_post_info:
1575         remove_proc_entry("POST_info", device_dir);
1576  err_remove_rom:
1577         remove_proc_entry("ROM", device_dir);
1578  err_remove_info:
1579         remove_proc_entry("info", device_dir);
1580  err_remove_dir:
1581         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1582         return -ENOMEM;
1583 }
1584
1585 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1586 {
1587         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1588
1589         if (device_dir) {
1590                 remove_proc_entry("info", device_dir);
1591                 remove_proc_entry("ROM", device_dir);
1592                 remove_proc_entry("POST_info", device_dir);
1593                 remove_proc_entry("POST", device_dir);
1594                 remove_proc_entry("DOS", device_dir);
1595                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1596                 acpi_device_dir(device) = NULL;
1597         }
1598
1599         return 0;
1600 }
1601
1602 /* --------------------------------------------------------------------------
1603                                  Driver Interface
1604    -------------------------------------------------------------------------- */
1605
1606 /* device interface */
1607 static struct acpi_video_device_attrib*
1608 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1609 {
1610         struct acpi_video_enumerated_device *ids;
1611         int i;
1612
1613         for (i = 0; i < video->attached_count; i++) {
1614                 ids = &video->attached_array[i];
1615                 if ((ids->value.int_val & 0xffff) == device_id)
1616                         return &ids->value.attrib;
1617         }
1618
1619         return NULL;
1620 }
1621
1622 static int
1623 acpi_video_bus_get_one_device(struct acpi_device *device,
1624                               struct acpi_video_bus *video)
1625 {
1626         unsigned long long device_id;
1627         int status;
1628         struct acpi_video_device *data;
1629         struct acpi_video_device_attrib* attribute;
1630
1631         if (!device || !video)
1632                 return -EINVAL;
1633
1634         status =
1635             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1636         if (ACPI_SUCCESS(status)) {
1637
1638                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1639                 if (!data)
1640                         return -ENOMEM;
1641
1642                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1643                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1644                 device->driver_data = data;
1645
1646                 data->device_id = device_id;
1647                 data->video = video;
1648                 data->dev = device;
1649
1650                 attribute = acpi_video_get_device_attr(video, device_id);
1651
1652                 if((attribute != NULL) && attribute->device_id_scheme) {
1653                         switch (attribute->display_type) {
1654                         case ACPI_VIDEO_DISPLAY_CRT:
1655                                 data->flags.crt = 1;
1656                                 break;
1657                         case ACPI_VIDEO_DISPLAY_TV:
1658                                 data->flags.tvout = 1;
1659                                 break;
1660                         case ACPI_VIDEO_DISPLAY_DVI:
1661                                 data->flags.dvi = 1;
1662                                 break;
1663                         case ACPI_VIDEO_DISPLAY_LCD:
1664                                 data->flags.lcd = 1;
1665                                 break;
1666                         default:
1667                                 data->flags.unknown = 1;
1668                                 break;
1669                         }
1670                         if(attribute->bios_can_detect)
1671                                 data->flags.bios = 1;
1672                 } else
1673                         data->flags.unknown = 1;
1674
1675                 acpi_video_device_bind(video, data);
1676                 acpi_video_device_find_cap(data);
1677
1678                 status = acpi_install_notify_handler(device->handle,
1679                                                      ACPI_DEVICE_NOTIFY,
1680                                                      acpi_video_device_notify,
1681                                                      data);
1682                 if (ACPI_FAILURE(status)) {
1683                         printk(KERN_ERR PREFIX
1684                                           "Error installing notify handler\n");
1685                         if(data->brightness)
1686                                 kfree(data->brightness->levels);
1687                         kfree(data->brightness);
1688                         kfree(data);
1689                         return -ENODEV;
1690                 }
1691
1692                 mutex_lock(&video->device_list_lock);
1693                 list_add_tail(&data->entry, &video->video_device_list);
1694                 mutex_unlock(&video->device_list_lock);
1695
1696                 acpi_video_device_add_fs(device);
1697
1698                 return 0;
1699         }
1700
1701         return -ENOENT;
1702 }
1703
1704 /*
1705  *  Arg:
1706  *      video   : video bus device
1707  *
1708  *  Return:
1709  *      none
1710  *
1711  *  Enumerate the video device list of the video bus,
1712  *  bind the ids with the corresponding video devices
1713  *  under the video bus.
1714  */
1715
1716 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1717 {
1718         struct acpi_video_device *dev;
1719
1720         mutex_lock(&video->device_list_lock);
1721
1722         list_for_each_entry(dev, &video->video_device_list, entry)
1723                 acpi_video_device_bind(video, dev);
1724
1725         mutex_unlock(&video->device_list_lock);
1726 }
1727
1728 /*
1729  *  Arg:
1730  *      video   : video bus device
1731  *      device  : video output device under the video
1732  *              bus
1733  *
1734  *  Return:
1735  *      none
1736  *
1737  *  Bind the ids with the corresponding video devices
1738  *  under the video bus.
1739  */
1740
1741 static void
1742 acpi_video_device_bind(struct acpi_video_bus *video,
1743                        struct acpi_video_device *device)
1744 {
1745         struct acpi_video_enumerated_device *ids;
1746         int i;
1747
1748         for (i = 0; i < video->attached_count; i++) {
1749                 ids = &video->attached_array[i];
1750                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1751                         ids->bind_info = device;
1752                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1753                 }
1754         }
1755 }
1756
1757 /*
1758  *  Arg:
1759  *      video   : video bus device
1760  *
1761  *  Return:
1762  *      < 0     : error
1763  *
1764  *  Call _DOD to enumerate all devices attached to display adapter
1765  *
1766  */
1767
1768 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1769 {
1770         int status;
1771         int count;
1772         int i;
1773         struct acpi_video_enumerated_device *active_list;
1774         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1775         union acpi_object *dod = NULL;
1776         union acpi_object *obj;
1777
1778         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1779         if (!ACPI_SUCCESS(status)) {
1780                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1781                 return status;
1782         }
1783
1784         dod = buffer.pointer;
1785         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1786                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1787                 status = -EFAULT;
1788                 goto out;
1789         }
1790
1791         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1792                           dod->package.count));
1793
1794         active_list = kcalloc(1 + dod->package.count,
1795                               sizeof(struct acpi_video_enumerated_device),
1796                               GFP_KERNEL);
1797         if (!active_list) {
1798                 status = -ENOMEM;
1799                 goto out;
1800         }
1801
1802         count = 0;
1803         for (i = 0; i < dod->package.count; i++) {
1804                 obj = &dod->package.elements[i];
1805
1806                 if (obj->type != ACPI_TYPE_INTEGER) {
1807                         printk(KERN_ERR PREFIX
1808                                 "Invalid _DOD data in element %d\n", i);
1809                         continue;
1810                 }
1811
1812                 active_list[count].value.int_val = obj->integer.value;
1813                 active_list[count].bind_info = NULL;
1814                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1815                                   (int)obj->integer.value));
1816                 count++;
1817         }
1818
1819         kfree(video->attached_array);
1820
1821         video->attached_array = active_list;
1822         video->attached_count = count;
1823
1824  out:
1825         kfree(buffer.pointer);
1826         return status;
1827 }
1828
1829 static int
1830 acpi_video_get_next_level(struct acpi_video_device *device,
1831                           u32 level_current, u32 event)
1832 {
1833         int min, max, min_above, max_below, i, l, delta = 255;
1834         max = max_below = 0;
1835         min = min_above = 255;
1836         /* Find closest level to level_current */
1837         for (i = 2; i < device->brightness->count; i++) {
1838                 l = device->brightness->levels[i];
1839                 if (abs(l - level_current) < abs(delta)) {
1840                         delta = l - level_current;
1841                         if (!delta)
1842                                 break;
1843                 }
1844         }
1845         /* Ajust level_current to closest available level */
1846         level_current += delta;
1847         for (i = 2; i < device->brightness->count; i++) {
1848                 l = device->brightness->levels[i];
1849                 if (l < min)
1850                         min = l;
1851                 if (l > max)
1852                         max = l;
1853                 if (l < min_above && l > level_current)
1854                         min_above = l;
1855                 if (l > max_below && l < level_current)
1856                         max_below = l;
1857         }
1858
1859         switch (event) {
1860         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1861                 return (level_current < max) ? min_above : min;
1862         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1863                 return (level_current < max) ? min_above : max;
1864         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1865                 return (level_current > min) ? max_below : min;
1866         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1867         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1868                 return 0;
1869         default:
1870                 return level_current;
1871         }
1872 }
1873
1874 static int
1875 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1876 {
1877         unsigned long long level_current, level_next;
1878         int result = -EINVAL;
1879
1880         if (!device->brightness)
1881                 goto out;
1882
1883         result = acpi_video_device_lcd_get_level_current(device,
1884                                                          &level_current);
1885         if (result)
1886                 goto out;
1887
1888         level_next = acpi_video_get_next_level(device, level_current, event);
1889
1890         result = acpi_video_device_lcd_set_level(device, level_next);
1891
1892 out:
1893         if (result)
1894                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1895
1896         return result;
1897 }
1898
1899 static int
1900 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1901                            struct acpi_device *device)
1902 {
1903         int status = 0;
1904         struct acpi_device *dev;
1905
1906         acpi_video_device_enumerate(video);
1907
1908         list_for_each_entry(dev, &device->children, node) {
1909
1910                 status = acpi_video_bus_get_one_device(dev, video);
1911                 if (ACPI_FAILURE(status)) {
1912                         printk(KERN_WARNING PREFIX
1913                                         "Cant attach device");
1914                         continue;
1915                 }
1916         }
1917         return status;
1918 }
1919
1920 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1921 {
1922         acpi_status status;
1923         struct acpi_video_bus *video;
1924
1925
1926         if (!device || !device->video)
1927                 return -ENOENT;
1928
1929         video = device->video;
1930
1931         acpi_video_device_remove_fs(device->dev);
1932
1933         status = acpi_remove_notify_handler(device->dev->handle,
1934                                             ACPI_DEVICE_NOTIFY,
1935                                             acpi_video_device_notify);
1936         backlight_device_unregister(device->backlight);
1937         if (device->cdev) {
1938                 sysfs_remove_link(&device->dev->dev.kobj,
1939                                   "thermal_cooling");
1940                 sysfs_remove_link(&device->cdev->device.kobj,
1941                                   "device");
1942                 thermal_cooling_device_unregister(device->cdev);
1943                 device->cdev = NULL;
1944         }
1945         video_output_unregister(device->output_dev);
1946
1947         return 0;
1948 }
1949
1950 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1951 {
1952         int status;
1953         struct acpi_video_device *dev, *next;
1954
1955         mutex_lock(&video->device_list_lock);
1956
1957         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1958
1959                 status = acpi_video_bus_put_one_device(dev);
1960                 if (ACPI_FAILURE(status))
1961                         printk(KERN_WARNING PREFIX
1962                                "hhuuhhuu bug in acpi video driver.\n");
1963
1964                 if (dev->brightness) {
1965                         kfree(dev->brightness->levels);
1966                         kfree(dev->brightness);
1967                 }
1968                 list_del(&dev->entry);
1969                 kfree(dev);
1970         }
1971
1972         mutex_unlock(&video->device_list_lock);
1973
1974         return 0;
1975 }
1976
1977 /* acpi_video interface */
1978
1979 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1980 {
1981         return acpi_video_bus_DOS(video, 0, 0);
1982 }
1983
1984 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1985 {
1986         return acpi_video_bus_DOS(video, 0, 1);
1987 }
1988
1989 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1990 {
1991         struct acpi_video_bus *video = data;
1992         struct acpi_device *device = NULL;
1993         struct input_dev *input;
1994         int keycode;
1995
1996         if (!video)
1997                 return;
1998
1999         device = video->device;
2000         input = video->input;
2001
2002         switch (event) {
2003         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2004                                          * most likely via hotkey. */
2005                 acpi_bus_generate_proc_event(device, event, 0);
2006                 keycode = KEY_SWITCHVIDEOMODE;
2007                 break;
2008
2009         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2010                                          * connector. */
2011                 acpi_video_device_enumerate(video);
2012                 acpi_video_device_rebind(video);
2013                 acpi_bus_generate_proc_event(device, event, 0);
2014                 keycode = KEY_SWITCHVIDEOMODE;
2015                 break;
2016
2017         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2018                 acpi_bus_generate_proc_event(device, event, 0);
2019                 keycode = KEY_SWITCHVIDEOMODE;
2020                 break;
2021         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2022                 acpi_bus_generate_proc_event(device, event, 0);
2023                 keycode = KEY_VIDEO_NEXT;
2024                 break;
2025         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2026                 acpi_bus_generate_proc_event(device, event, 0);
2027                 keycode = KEY_VIDEO_PREV;
2028                 break;
2029
2030         default:
2031                 keycode = KEY_UNKNOWN;
2032                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2033                                   "Unsupported event [0x%x]\n", event));
2034                 break;
2035         }
2036
2037         acpi_notifier_call_chain(device, event, 0);
2038         input_report_key(input, keycode, 1);
2039         input_sync(input);
2040         input_report_key(input, keycode, 0);
2041         input_sync(input);
2042
2043         return;
2044 }
2045
2046 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2047 {
2048         struct acpi_video_device *video_device = data;
2049         struct acpi_device *device = NULL;
2050         struct acpi_video_bus *bus;
2051         struct input_dev *input;
2052         int keycode;
2053
2054         if (!video_device)
2055                 return;
2056
2057         device = video_device->dev;
2058         bus = video_device->video;
2059         input = bus->input;
2060
2061         switch (event) {
2062         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2063                 if (brightness_switch_enabled)
2064                         acpi_video_switch_brightness(video_device, event);
2065                 acpi_bus_generate_proc_event(device, event, 0);
2066                 keycode = KEY_BRIGHTNESS_CYCLE;
2067                 break;
2068         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2069                 if (brightness_switch_enabled)
2070                         acpi_video_switch_brightness(video_device, event);
2071                 acpi_bus_generate_proc_event(device, event, 0);
2072                 keycode = KEY_BRIGHTNESSUP;
2073                 break;
2074         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2075                 if (brightness_switch_enabled)
2076                         acpi_video_switch_brightness(video_device, event);
2077                 acpi_bus_generate_proc_event(device, event, 0);
2078                 keycode = KEY_BRIGHTNESSDOWN;
2079                 break;
2080         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2081                 if (brightness_switch_enabled)
2082                         acpi_video_switch_brightness(video_device, event);
2083                 acpi_bus_generate_proc_event(device, event, 0);
2084                 keycode = KEY_BRIGHTNESS_ZERO;
2085                 break;
2086         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2087                 if (brightness_switch_enabled)
2088                         acpi_video_switch_brightness(video_device, event);
2089                 acpi_bus_generate_proc_event(device, event, 0);
2090                 keycode = KEY_DISPLAY_OFF;
2091                 break;
2092         default:
2093                 keycode = KEY_UNKNOWN;
2094                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2095                                   "Unsupported event [0x%x]\n", event));
2096                 break;
2097         }
2098
2099         acpi_notifier_call_chain(device, event, 0);
2100         input_report_key(input, keycode, 1);
2101         input_sync(input);
2102         input_report_key(input, keycode, 0);
2103         input_sync(input);
2104
2105         return;
2106 }
2107
2108 static int instance;
2109 static int acpi_video_resume(struct acpi_device *device)
2110 {
2111         struct acpi_video_bus *video;
2112         struct acpi_video_device *video_device;
2113         int i;
2114
2115         if (!device || !acpi_driver_data(device))
2116                 return -EINVAL;
2117
2118         video = acpi_driver_data(device);
2119
2120         for (i = 0; i < video->attached_count; i++) {
2121                 video_device = video->attached_array[i].bind_info;
2122                 if (video_device && video_device->backlight)
2123                         acpi_video_set_brightness(video_device->backlight);
2124         }
2125         return AE_OK;
2126 }
2127
2128 static int acpi_video_bus_add(struct acpi_device *device)
2129 {
2130         acpi_status status;
2131         struct acpi_video_bus *video;
2132         struct input_dev *input;
2133         int error;
2134
2135         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2136         if (!video)
2137                 return -ENOMEM;
2138
2139         /* a hack to fix the duplicate name "VID" problem on T61 */
2140         if (!strcmp(device->pnp.bus_id, "VID")) {
2141                 if (instance)
2142                         device->pnp.bus_id[3] = '0' + instance;
2143                 instance ++;
2144         }
2145         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2146         if (!strcmp(device->pnp.bus_id, "VGA")) {
2147                 if (instance)
2148                         device->pnp.bus_id[3] = '0' + instance;
2149                 instance++;
2150         }
2151
2152         video->device = device;
2153         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2154         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2155         device->driver_data = video;
2156
2157         acpi_video_bus_find_cap(video);
2158         error = acpi_video_bus_check(video);
2159         if (error)
2160                 goto err_free_video;
2161
2162         error = acpi_video_bus_add_fs(device);
2163         if (error)
2164                 goto err_free_video;
2165
2166         mutex_init(&video->device_list_lock);
2167         INIT_LIST_HEAD(&video->video_device_list);
2168
2169         acpi_video_bus_get_devices(video, device);
2170         acpi_video_bus_start_devices(video);
2171
2172         status = acpi_install_notify_handler(device->handle,
2173                                              ACPI_DEVICE_NOTIFY,
2174                                              acpi_video_bus_notify, video);
2175         if (ACPI_FAILURE(status)) {
2176                 printk(KERN_ERR PREFIX
2177                                   "Error installing notify handler\n");
2178                 error = -ENODEV;
2179                 goto err_stop_video;
2180         }
2181
2182         video->input = input = input_allocate_device();
2183         if (!input) {
2184                 error = -ENOMEM;
2185                 goto err_uninstall_notify;
2186         }
2187
2188         snprintf(video->phys, sizeof(video->phys),
2189                 "%s/video/input0", acpi_device_hid(video->device));
2190
2191         input->name = acpi_device_name(video->device);
2192         input->phys = video->phys;
2193         input->id.bustype = BUS_HOST;
2194         input->id.product = 0x06;
2195         input->dev.parent = &device->dev;
2196         input->evbit[0] = BIT(EV_KEY);
2197         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2198         set_bit(KEY_VIDEO_NEXT, input->keybit);
2199         set_bit(KEY_VIDEO_PREV, input->keybit);
2200         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2201         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2202         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2203         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2204         set_bit(KEY_DISPLAY_OFF, input->keybit);
2205         set_bit(KEY_UNKNOWN, input->keybit);
2206
2207         error = input_register_device(input);
2208         if (error)
2209                 goto err_free_input_dev;
2210
2211         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2212                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2213                video->flags.multihead ? "yes" : "no",
2214                video->flags.rom ? "yes" : "no",
2215                video->flags.post ? "yes" : "no");
2216
2217         return 0;
2218
2219  err_free_input_dev:
2220         input_free_device(input);
2221  err_uninstall_notify:
2222         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2223                                    acpi_video_bus_notify);
2224  err_stop_video:
2225         acpi_video_bus_stop_devices(video);
2226         acpi_video_bus_put_devices(video);
2227         kfree(video->attached_array);
2228         acpi_video_bus_remove_fs(device);
2229  err_free_video:
2230         kfree(video);
2231         device->driver_data = NULL;
2232
2233         return error;
2234 }
2235
2236 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2237 {
2238         acpi_status status = 0;
2239         struct acpi_video_bus *video = NULL;
2240
2241
2242         if (!device || !acpi_driver_data(device))
2243                 return -EINVAL;
2244
2245         video = acpi_driver_data(device);
2246
2247         acpi_video_bus_stop_devices(video);
2248
2249         status = acpi_remove_notify_handler(video->device->handle,
2250                                             ACPI_DEVICE_NOTIFY,
2251                                             acpi_video_bus_notify);
2252
2253         acpi_video_bus_put_devices(video);
2254         acpi_video_bus_remove_fs(device);
2255
2256         input_unregister_device(video->input);
2257         kfree(video->attached_array);
2258         kfree(video);
2259
2260         return 0;
2261 }
2262
2263 static int __init intel_opregion_present(void)
2264 {
2265 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2266         struct pci_dev *dev = NULL;
2267         u32 address;
2268
2269         for_each_pci_dev(dev) {
2270                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2271                         continue;
2272                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2273                         continue;
2274                 pci_read_config_dword(dev, 0xfc, &address);
2275                 if (!address)
2276                         continue;
2277                 return 1;
2278         }
2279 #endif
2280         return 0;
2281 }
2282
2283 int acpi_video_register(void)
2284 {
2285         int result = 0;
2286
2287         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2288         if (!acpi_video_dir)
2289                 return -ENODEV;
2290
2291         result = acpi_bus_register_driver(&acpi_video_bus);
2292         if (result < 0) {
2293                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2294                 return -ENODEV;
2295         }
2296
2297         return 0;
2298 }
2299 EXPORT_SYMBOL(acpi_video_register);
2300
2301 /*
2302  * This is kind of nasty. Hardware using Intel chipsets may require
2303  * the video opregion code to be run first in order to initialise
2304  * state before any ACPI video calls are made. To handle this we defer
2305  * registration of the video class until the opregion code has run.
2306  */
2307
2308 static int __init acpi_video_init(void)
2309 {
2310         if (intel_opregion_present())
2311                 return 0;
2312
2313         return acpi_video_register();
2314 }
2315
2316 static void __exit acpi_video_exit(void)
2317 {
2318
2319         acpi_bus_unregister_driver(&acpi_video_bus);
2320
2321         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2322
2323         return;
2324 }
2325
2326 module_init(acpi_video_init);
2327 module_exit(acpi_video_exit);