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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         device_dir->owner = THIS_MODULE;
1260
1261         /* 'info' [R] */
1262         entry = proc_create_data("info", S_IRUGO, device_dir,
1263                         &acpi_video_device_info_fops, acpi_driver_data(device));
1264         if (!entry)
1265                 goto err_remove_dir;
1266
1267         /* 'state' [R/W] */
1268         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1269                                  device_dir,
1270                                  &acpi_video_device_state_fops,
1271                                  acpi_driver_data(device));
1272         if (!entry)
1273                 goto err_remove_info;
1274
1275         /* 'brightness' [R/W] */
1276         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1277                                  device_dir,
1278                                  &acpi_video_device_brightness_fops,
1279                                  acpi_driver_data(device));
1280         if (!entry)
1281                 goto err_remove_state;
1282
1283         /* 'EDID' [R] */
1284         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1285                                  &acpi_video_device_EDID_fops,
1286                                  acpi_driver_data(device));
1287         if (!entry)
1288                 goto err_remove_brightness;
1289
1290         acpi_device_dir(device) = device_dir;
1291
1292         return 0;
1293
1294  err_remove_brightness:
1295         remove_proc_entry("brightness", device_dir);
1296  err_remove_state:
1297         remove_proc_entry("state", device_dir);
1298  err_remove_info:
1299         remove_proc_entry("info", device_dir);
1300  err_remove_dir:
1301         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1302         return -ENOMEM;
1303 }
1304
1305 static int acpi_video_device_remove_fs(struct acpi_device *device)
1306 {
1307         struct acpi_video_device *vid_dev;
1308         struct proc_dir_entry *device_dir;
1309
1310         vid_dev = acpi_driver_data(device);
1311         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1312                 return -ENODEV;
1313
1314         device_dir = acpi_device_dir(device);
1315         if (device_dir) {
1316                 remove_proc_entry("info", device_dir);
1317                 remove_proc_entry("state", device_dir);
1318                 remove_proc_entry("brightness", device_dir);
1319                 remove_proc_entry("EDID", device_dir);
1320                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1321                 acpi_device_dir(device) = NULL;
1322         }
1323
1324         return 0;
1325 }
1326
1327 /* video bus */
1328 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1329 {
1330         struct acpi_video_bus *video = seq->private;
1331
1332
1333         if (!video)
1334                 goto end;
1335
1336         seq_printf(seq, "Switching heads:              %s\n",
1337                    video->flags.multihead ? "yes" : "no");
1338         seq_printf(seq, "Video ROM:                    %s\n",
1339                    video->flags.rom ? "yes" : "no");
1340         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1341                    video->flags.post ? "yes" : "no");
1342
1343       end:
1344         return 0;
1345 }
1346
1347 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1348 {
1349         return single_open(file, acpi_video_bus_info_seq_show,
1350                            PDE(inode)->data);
1351 }
1352
1353 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1354 {
1355         struct acpi_video_bus *video = seq->private;
1356
1357
1358         if (!video)
1359                 goto end;
1360
1361         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1362         seq_printf(seq, "<TODO>\n");
1363
1364       end:
1365         return 0;
1366 }
1367
1368 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1369 {
1370         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1371 }
1372
1373 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1374 {
1375         struct acpi_video_bus *video = seq->private;
1376         unsigned long long options;
1377         int status;
1378
1379
1380         if (!video)
1381                 goto end;
1382
1383         status = acpi_video_bus_POST_options(video, &options);
1384         if (ACPI_SUCCESS(status)) {
1385                 if (!(options & 1)) {
1386                         printk(KERN_WARNING PREFIX
1387                                "The motherboard VGA device is not listed as a possible POST device.\n");
1388                         printk(KERN_WARNING PREFIX
1389                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1390                 }
1391                 printk(KERN_WARNING "%llx\n", options);
1392                 seq_printf(seq, "can POST: <integrated video>");
1393                 if (options & 2)
1394                         seq_printf(seq, " <PCI video>");
1395                 if (options & 4)
1396                         seq_printf(seq, " <AGP video>");
1397                 seq_putc(seq, '\n');
1398         } else
1399                 seq_printf(seq, "<not supported>\n");
1400       end:
1401         return 0;
1402 }
1403
1404 static int
1405 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1406 {
1407         return single_open(file, acpi_video_bus_POST_info_seq_show,
1408                            PDE(inode)->data);
1409 }
1410
1411 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1412 {
1413         struct acpi_video_bus *video = seq->private;
1414         int status;
1415         unsigned long long id;
1416
1417
1418         if (!video)
1419                 goto end;
1420
1421         status = acpi_video_bus_get_POST(video, &id);
1422         if (!ACPI_SUCCESS(status)) {
1423                 seq_printf(seq, "<not supported>\n");
1424                 goto end;
1425         }
1426         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1427
1428       end:
1429         return 0;
1430 }
1431
1432 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1433 {
1434         struct acpi_video_bus *video = seq->private;
1435
1436
1437         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1438
1439         return 0;
1440 }
1441
1442 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1443 {
1444         return single_open(file, acpi_video_bus_POST_seq_show,
1445                            PDE(inode)->data);
1446 }
1447
1448 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1449 {
1450         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1451 }
1452
1453 static ssize_t
1454 acpi_video_bus_write_POST(struct file *file,
1455                           const char __user * buffer,
1456                           size_t count, loff_t * data)
1457 {
1458         int status;
1459         struct seq_file *m = file->private_data;
1460         struct acpi_video_bus *video = m->private;
1461         char str[12] = { 0 };
1462         unsigned long long opt, options;
1463
1464
1465         if (!video || count + 1 > sizeof str)
1466                 return -EINVAL;
1467
1468         status = acpi_video_bus_POST_options(video, &options);
1469         if (!ACPI_SUCCESS(status))
1470                 return -EINVAL;
1471
1472         if (copy_from_user(str, buffer, count))
1473                 return -EFAULT;
1474
1475         str[count] = 0;
1476         opt = strtoul(str, NULL, 0);
1477         if (opt > 3)
1478                 return -EFAULT;
1479
1480         /* just in case an OEM 'forgot' the motherboard... */
1481         options |= 1;
1482
1483         if (options & (1ul << opt)) {
1484                 status = acpi_video_bus_set_POST(video, opt);
1485                 if (!ACPI_SUCCESS(status))
1486                         return -EFAULT;
1487
1488         }
1489
1490         return count;
1491 }
1492
1493 static ssize_t
1494 acpi_video_bus_write_DOS(struct file *file,
1495                          const char __user * buffer,
1496                          size_t count, loff_t * data)
1497 {
1498         int status;
1499         struct seq_file *m = file->private_data;
1500         struct acpi_video_bus *video = m->private;
1501         char str[12] = { 0 };
1502         unsigned long opt;
1503
1504
1505         if (!video || count + 1 > sizeof str)
1506                 return -EINVAL;
1507
1508         if (copy_from_user(str, buffer, count))
1509                 return -EFAULT;
1510
1511         str[count] = 0;
1512         opt = strtoul(str, NULL, 0);
1513         if (opt > 7)
1514                 return -EFAULT;
1515
1516         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1517
1518         if (!ACPI_SUCCESS(status))
1519                 return -EFAULT;
1520
1521         return count;
1522 }
1523
1524 static int acpi_video_bus_add_fs(struct acpi_device *device)
1525 {
1526         struct acpi_video_bus *video = acpi_driver_data(device);
1527         struct proc_dir_entry *device_dir;
1528         struct proc_dir_entry *entry;
1529
1530         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1531         if (!device_dir)
1532                 return -ENOMEM;
1533
1534         device_dir->owner = THIS_MODULE;
1535
1536         /* 'info' [R] */
1537         entry = proc_create_data("info", S_IRUGO, device_dir,
1538                                  &acpi_video_bus_info_fops,
1539                                  acpi_driver_data(device));
1540         if (!entry)
1541                 goto err_remove_dir;
1542
1543         /* 'ROM' [R] */
1544         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1545                                  &acpi_video_bus_ROM_fops,
1546                                  acpi_driver_data(device));
1547         if (!entry)
1548                 goto err_remove_info;
1549
1550         /* 'POST_info' [R] */
1551         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1552                                  &acpi_video_bus_POST_info_fops,
1553                                  acpi_driver_data(device));
1554         if (!entry)
1555                 goto err_remove_rom;
1556
1557         /* 'POST' [R/W] */
1558         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1559                                  device_dir,
1560                                  &acpi_video_bus_POST_fops,
1561                                  acpi_driver_data(device));
1562         if (!entry)
1563                 goto err_remove_post_info;
1564
1565         /* 'DOS' [R/W] */
1566         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1567                                  device_dir,
1568                                  &acpi_video_bus_DOS_fops,
1569                                  acpi_driver_data(device));
1570         if (!entry)
1571                 goto err_remove_post;
1572
1573         video->dir = acpi_device_dir(device) = device_dir;
1574         return 0;
1575
1576  err_remove_post:
1577         remove_proc_entry("POST", device_dir);
1578  err_remove_post_info:
1579         remove_proc_entry("POST_info", device_dir);
1580  err_remove_rom:
1581         remove_proc_entry("ROM", device_dir);
1582  err_remove_info:
1583         remove_proc_entry("info", device_dir);
1584  err_remove_dir:
1585         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1586         return -ENOMEM;
1587 }
1588
1589 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1590 {
1591         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1592
1593         if (device_dir) {
1594                 remove_proc_entry("info", device_dir);
1595                 remove_proc_entry("ROM", device_dir);
1596                 remove_proc_entry("POST_info", device_dir);
1597                 remove_proc_entry("POST", device_dir);
1598                 remove_proc_entry("DOS", device_dir);
1599                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1600                 acpi_device_dir(device) = NULL;
1601         }
1602
1603         return 0;
1604 }
1605
1606 /* --------------------------------------------------------------------------
1607                                  Driver Interface
1608    -------------------------------------------------------------------------- */
1609
1610 /* device interface */
1611 static struct acpi_video_device_attrib*
1612 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1613 {
1614         struct acpi_video_enumerated_device *ids;
1615         int i;
1616
1617         for (i = 0; i < video->attached_count; i++) {
1618                 ids = &video->attached_array[i];
1619                 if ((ids->value.int_val & 0xffff) == device_id)
1620                         return &ids->value.attrib;
1621         }
1622
1623         return NULL;
1624 }
1625
1626 static int
1627 acpi_video_bus_get_one_device(struct acpi_device *device,
1628                               struct acpi_video_bus *video)
1629 {
1630         unsigned long long device_id;
1631         int status;
1632         struct acpi_video_device *data;
1633         struct acpi_video_device_attrib* attribute;
1634
1635         if (!device || !video)
1636                 return -EINVAL;
1637
1638         status =
1639             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1640         if (ACPI_SUCCESS(status)) {
1641
1642                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1643                 if (!data)
1644                         return -ENOMEM;
1645
1646                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1647                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1648                 device->driver_data = data;
1649
1650                 data->device_id = device_id;
1651                 data->video = video;
1652                 data->dev = device;
1653
1654                 attribute = acpi_video_get_device_attr(video, device_id);
1655
1656                 if((attribute != NULL) && attribute->device_id_scheme) {
1657                         switch (attribute->display_type) {
1658                         case ACPI_VIDEO_DISPLAY_CRT:
1659                                 data->flags.crt = 1;
1660                                 break;
1661                         case ACPI_VIDEO_DISPLAY_TV:
1662                                 data->flags.tvout = 1;
1663                                 break;
1664                         case ACPI_VIDEO_DISPLAY_DVI:
1665                                 data->flags.dvi = 1;
1666                                 break;
1667                         case ACPI_VIDEO_DISPLAY_LCD:
1668                                 data->flags.lcd = 1;
1669                                 break;
1670                         default:
1671                                 data->flags.unknown = 1;
1672                                 break;
1673                         }
1674                         if(attribute->bios_can_detect)
1675                                 data->flags.bios = 1;
1676                 } else
1677                         data->flags.unknown = 1;
1678
1679                 acpi_video_device_bind(video, data);
1680                 acpi_video_device_find_cap(data);
1681
1682                 status = acpi_install_notify_handler(device->handle,
1683                                                      ACPI_DEVICE_NOTIFY,
1684                                                      acpi_video_device_notify,
1685                                                      data);
1686                 if (ACPI_FAILURE(status)) {
1687                         printk(KERN_ERR PREFIX
1688                                           "Error installing notify handler\n");
1689                         if(data->brightness)
1690                                 kfree(data->brightness->levels);
1691                         kfree(data->brightness);
1692                         kfree(data);
1693                         return -ENODEV;
1694                 }
1695
1696                 mutex_lock(&video->device_list_lock);
1697                 list_add_tail(&data->entry, &video->video_device_list);
1698                 mutex_unlock(&video->device_list_lock);
1699
1700                 acpi_video_device_add_fs(device);
1701
1702                 return 0;
1703         }
1704
1705         return -ENOENT;
1706 }
1707
1708 /*
1709  *  Arg:
1710  *      video   : video bus device
1711  *
1712  *  Return:
1713  *      none
1714  *
1715  *  Enumerate the video device list of the video bus,
1716  *  bind the ids with the corresponding video devices
1717  *  under the video bus.
1718  */
1719
1720 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1721 {
1722         struct acpi_video_device *dev;
1723
1724         mutex_lock(&video->device_list_lock);
1725
1726         list_for_each_entry(dev, &video->video_device_list, entry)
1727                 acpi_video_device_bind(video, dev);
1728
1729         mutex_unlock(&video->device_list_lock);
1730 }
1731
1732 /*
1733  *  Arg:
1734  *      video   : video bus device
1735  *      device  : video output device under the video
1736  *              bus
1737  *
1738  *  Return:
1739  *      none
1740  *
1741  *  Bind the ids with the corresponding video devices
1742  *  under the video bus.
1743  */
1744
1745 static void
1746 acpi_video_device_bind(struct acpi_video_bus *video,
1747                        struct acpi_video_device *device)
1748 {
1749         struct acpi_video_enumerated_device *ids;
1750         int i;
1751
1752         for (i = 0; i < video->attached_count; i++) {
1753                 ids = &video->attached_array[i];
1754                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1755                         ids->bind_info = device;
1756                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1757                 }
1758         }
1759 }
1760
1761 /*
1762  *  Arg:
1763  *      video   : video bus device
1764  *
1765  *  Return:
1766  *      < 0     : error
1767  *
1768  *  Call _DOD to enumerate all devices attached to display adapter
1769  *
1770  */
1771
1772 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1773 {
1774         int status;
1775         int count;
1776         int i;
1777         struct acpi_video_enumerated_device *active_list;
1778         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1779         union acpi_object *dod = NULL;
1780         union acpi_object *obj;
1781
1782         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1783         if (!ACPI_SUCCESS(status)) {
1784                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1785                 return status;
1786         }
1787
1788         dod = buffer.pointer;
1789         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1790                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1791                 status = -EFAULT;
1792                 goto out;
1793         }
1794
1795         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1796                           dod->package.count));
1797
1798         active_list = kcalloc(1 + dod->package.count,
1799                               sizeof(struct acpi_video_enumerated_device),
1800                               GFP_KERNEL);
1801         if (!active_list) {
1802                 status = -ENOMEM;
1803                 goto out;
1804         }
1805
1806         count = 0;
1807         for (i = 0; i < dod->package.count; i++) {
1808                 obj = &dod->package.elements[i];
1809
1810                 if (obj->type != ACPI_TYPE_INTEGER) {
1811                         printk(KERN_ERR PREFIX
1812                                 "Invalid _DOD data in element %d\n", i);
1813                         continue;
1814                 }
1815
1816                 active_list[count].value.int_val = obj->integer.value;
1817                 active_list[count].bind_info = NULL;
1818                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1819                                   (int)obj->integer.value));
1820                 count++;
1821         }
1822
1823         kfree(video->attached_array);
1824
1825         video->attached_array = active_list;
1826         video->attached_count = count;
1827
1828  out:
1829         kfree(buffer.pointer);
1830         return status;
1831 }
1832
1833 static int
1834 acpi_video_get_next_level(struct acpi_video_device *device,
1835                           u32 level_current, u32 event)
1836 {
1837         int min, max, min_above, max_below, i, l, delta = 255;
1838         max = max_below = 0;
1839         min = min_above = 255;
1840         /* Find closest level to level_current */
1841         for (i = 2; i < device->brightness->count; i++) {
1842                 l = device->brightness->levels[i];
1843                 if (abs(l - level_current) < abs(delta)) {
1844                         delta = l - level_current;
1845                         if (!delta)
1846                                 break;
1847                 }
1848         }
1849         /* Ajust level_current to closest available level */
1850         level_current += delta;
1851         for (i = 2; i < device->brightness->count; i++) {
1852                 l = device->brightness->levels[i];
1853                 if (l < min)
1854                         min = l;
1855                 if (l > max)
1856                         max = l;
1857                 if (l < min_above && l > level_current)
1858                         min_above = l;
1859                 if (l > max_below && l < level_current)
1860                         max_below = l;
1861         }
1862
1863         switch (event) {
1864         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1865                 return (level_current < max) ? min_above : min;
1866         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1867                 return (level_current < max) ? min_above : max;
1868         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1869                 return (level_current > min) ? max_below : min;
1870         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1871         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1872                 return 0;
1873         default:
1874                 return level_current;
1875         }
1876 }
1877
1878 static int
1879 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1880 {
1881         unsigned long long level_current, level_next;
1882         int result = -EINVAL;
1883
1884         if (!device->brightness)
1885                 goto out;
1886
1887         result = acpi_video_device_lcd_get_level_current(device,
1888                                                          &level_current);
1889         if (result)
1890                 goto out;
1891
1892         level_next = acpi_video_get_next_level(device, level_current, event);
1893
1894         result = acpi_video_device_lcd_set_level(device, level_next);
1895
1896 out:
1897         if (result)
1898                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1899
1900         return result;
1901 }
1902
1903 static int
1904 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1905                            struct acpi_device *device)
1906 {
1907         int status = 0;
1908         struct acpi_device *dev;
1909
1910         acpi_video_device_enumerate(video);
1911
1912         list_for_each_entry(dev, &device->children, node) {
1913
1914                 status = acpi_video_bus_get_one_device(dev, video);
1915                 if (ACPI_FAILURE(status)) {
1916                         printk(KERN_WARNING PREFIX
1917                                         "Cant attach device");
1918                         continue;
1919                 }
1920         }
1921         return status;
1922 }
1923
1924 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1925 {
1926         acpi_status status;
1927         struct acpi_video_bus *video;
1928
1929
1930         if (!device || !device->video)
1931                 return -ENOENT;
1932
1933         video = device->video;
1934
1935         acpi_video_device_remove_fs(device->dev);
1936
1937         status = acpi_remove_notify_handler(device->dev->handle,
1938                                             ACPI_DEVICE_NOTIFY,
1939                                             acpi_video_device_notify);
1940         backlight_device_unregister(device->backlight);
1941         if (device->cdev) {
1942                 sysfs_remove_link(&device->dev->dev.kobj,
1943                                   "thermal_cooling");
1944                 sysfs_remove_link(&device->cdev->device.kobj,
1945                                   "device");
1946                 thermal_cooling_device_unregister(device->cdev);
1947                 device->cdev = NULL;
1948         }
1949         video_output_unregister(device->output_dev);
1950
1951         return 0;
1952 }
1953
1954 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1955 {
1956         int status;
1957         struct acpi_video_device *dev, *next;
1958
1959         mutex_lock(&video->device_list_lock);
1960
1961         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1962
1963                 status = acpi_video_bus_put_one_device(dev);
1964                 if (ACPI_FAILURE(status))
1965                         printk(KERN_WARNING PREFIX
1966                                "hhuuhhuu bug in acpi video driver.\n");
1967
1968                 if (dev->brightness) {
1969                         kfree(dev->brightness->levels);
1970                         kfree(dev->brightness);
1971                 }
1972                 list_del(&dev->entry);
1973                 kfree(dev);
1974         }
1975
1976         mutex_unlock(&video->device_list_lock);
1977
1978         return 0;
1979 }
1980
1981 /* acpi_video interface */
1982
1983 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1984 {
1985         return acpi_video_bus_DOS(video, 0, 0);
1986 }
1987
1988 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1989 {
1990         return acpi_video_bus_DOS(video, 0, 1);
1991 }
1992
1993 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1994 {
1995         struct acpi_video_bus *video = data;
1996         struct acpi_device *device = NULL;
1997         struct input_dev *input;
1998         int keycode;
1999
2000         if (!video)
2001                 return;
2002
2003         device = video->device;
2004         input = video->input;
2005
2006         switch (event) {
2007         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2008                                          * most likely via hotkey. */
2009                 acpi_bus_generate_proc_event(device, event, 0);
2010                 keycode = KEY_SWITCHVIDEOMODE;
2011                 break;
2012
2013         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2014                                          * connector. */
2015                 acpi_video_device_enumerate(video);
2016                 acpi_video_device_rebind(video);
2017                 acpi_bus_generate_proc_event(device, event, 0);
2018                 keycode = KEY_SWITCHVIDEOMODE;
2019                 break;
2020
2021         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2022                 acpi_bus_generate_proc_event(device, event, 0);
2023                 keycode = KEY_SWITCHVIDEOMODE;
2024                 break;
2025         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2026                 acpi_bus_generate_proc_event(device, event, 0);
2027                 keycode = KEY_VIDEO_NEXT;
2028                 break;
2029         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2030                 acpi_bus_generate_proc_event(device, event, 0);
2031                 keycode = KEY_VIDEO_PREV;
2032                 break;
2033
2034         default:
2035                 keycode = KEY_UNKNOWN;
2036                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2037                                   "Unsupported event [0x%x]\n", event));
2038                 break;
2039         }
2040
2041         acpi_notifier_call_chain(device, event, 0);
2042         input_report_key(input, keycode, 1);
2043         input_sync(input);
2044         input_report_key(input, keycode, 0);
2045         input_sync(input);
2046
2047         return;
2048 }
2049
2050 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2051 {
2052         struct acpi_video_device *video_device = data;
2053         struct acpi_device *device = NULL;
2054         struct acpi_video_bus *bus;
2055         struct input_dev *input;
2056         int keycode;
2057
2058         if (!video_device)
2059                 return;
2060
2061         device = video_device->dev;
2062         bus = video_device->video;
2063         input = bus->input;
2064
2065         switch (event) {
2066         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2067                 if (brightness_switch_enabled)
2068                         acpi_video_switch_brightness(video_device, event);
2069                 acpi_bus_generate_proc_event(device, event, 0);
2070                 keycode = KEY_BRIGHTNESS_CYCLE;
2071                 break;
2072         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2073                 if (brightness_switch_enabled)
2074                         acpi_video_switch_brightness(video_device, event);
2075                 acpi_bus_generate_proc_event(device, event, 0);
2076                 keycode = KEY_BRIGHTNESSUP;
2077                 break;
2078         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2079                 if (brightness_switch_enabled)
2080                         acpi_video_switch_brightness(video_device, event);
2081                 acpi_bus_generate_proc_event(device, event, 0);
2082                 keycode = KEY_BRIGHTNESSDOWN;
2083                 break;
2084         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2085                 if (brightness_switch_enabled)
2086                         acpi_video_switch_brightness(video_device, event);
2087                 acpi_bus_generate_proc_event(device, event, 0);
2088                 keycode = KEY_BRIGHTNESS_ZERO;
2089                 break;
2090         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2091                 if (brightness_switch_enabled)
2092                         acpi_video_switch_brightness(video_device, event);
2093                 acpi_bus_generate_proc_event(device, event, 0);
2094                 keycode = KEY_DISPLAY_OFF;
2095                 break;
2096         default:
2097                 keycode = KEY_UNKNOWN;
2098                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2099                                   "Unsupported event [0x%x]\n", event));
2100                 break;
2101         }
2102
2103         acpi_notifier_call_chain(device, event, 0);
2104         input_report_key(input, keycode, 1);
2105         input_sync(input);
2106         input_report_key(input, keycode, 0);
2107         input_sync(input);
2108
2109         return;
2110 }
2111
2112 static int instance;
2113 static int acpi_video_resume(struct acpi_device *device)
2114 {
2115         struct acpi_video_bus *video;
2116         struct acpi_video_device *video_device;
2117         int i;
2118
2119         if (!device || !acpi_driver_data(device))
2120                 return -EINVAL;
2121
2122         video = acpi_driver_data(device);
2123
2124         for (i = 0; i < video->attached_count; i++) {
2125                 video_device = video->attached_array[i].bind_info;
2126                 if (video_device && video_device->backlight)
2127                         acpi_video_set_brightness(video_device->backlight);
2128         }
2129         return AE_OK;
2130 }
2131
2132 static int acpi_video_bus_add(struct acpi_device *device)
2133 {
2134         acpi_status status;
2135         struct acpi_video_bus *video;
2136         struct input_dev *input;
2137         int error;
2138
2139         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2140         if (!video)
2141                 return -ENOMEM;
2142
2143         /* a hack to fix the duplicate name "VID" problem on T61 */
2144         if (!strcmp(device->pnp.bus_id, "VID")) {
2145                 if (instance)
2146                         device->pnp.bus_id[3] = '0' + instance;
2147                 instance ++;
2148         }
2149         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2150         if (!strcmp(device->pnp.bus_id, "VGA")) {
2151                 if (instance)
2152                         device->pnp.bus_id[3] = '0' + instance;
2153                 instance++;
2154         }
2155
2156         video->device = device;
2157         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2158         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2159         device->driver_data = video;
2160
2161         acpi_video_bus_find_cap(video);
2162         error = acpi_video_bus_check(video);
2163         if (error)
2164                 goto err_free_video;
2165
2166         error = acpi_video_bus_add_fs(device);
2167         if (error)
2168                 goto err_free_video;
2169
2170         mutex_init(&video->device_list_lock);
2171         INIT_LIST_HEAD(&video->video_device_list);
2172
2173         acpi_video_bus_get_devices(video, device);
2174         acpi_video_bus_start_devices(video);
2175
2176         status = acpi_install_notify_handler(device->handle,
2177                                              ACPI_DEVICE_NOTIFY,
2178                                              acpi_video_bus_notify, video);
2179         if (ACPI_FAILURE(status)) {
2180                 printk(KERN_ERR PREFIX
2181                                   "Error installing notify handler\n");
2182                 error = -ENODEV;
2183                 goto err_stop_video;
2184         }
2185
2186         video->input = input = input_allocate_device();
2187         if (!input) {
2188                 error = -ENOMEM;
2189                 goto err_uninstall_notify;
2190         }
2191
2192         snprintf(video->phys, sizeof(video->phys),
2193                 "%s/video/input0", acpi_device_hid(video->device));
2194
2195         input->name = acpi_device_name(video->device);
2196         input->phys = video->phys;
2197         input->id.bustype = BUS_HOST;
2198         input->id.product = 0x06;
2199         input->dev.parent = &device->dev;
2200         input->evbit[0] = BIT(EV_KEY);
2201         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2202         set_bit(KEY_VIDEO_NEXT, input->keybit);
2203         set_bit(KEY_VIDEO_PREV, input->keybit);
2204         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2205         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2206         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2207         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2208         set_bit(KEY_DISPLAY_OFF, input->keybit);
2209         set_bit(KEY_UNKNOWN, input->keybit);
2210
2211         error = input_register_device(input);
2212         if (error)
2213                 goto err_free_input_dev;
2214
2215         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2216                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2217                video->flags.multihead ? "yes" : "no",
2218                video->flags.rom ? "yes" : "no",
2219                video->flags.post ? "yes" : "no");
2220
2221         return 0;
2222
2223  err_free_input_dev:
2224         input_free_device(input);
2225  err_uninstall_notify:
2226         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2227                                    acpi_video_bus_notify);
2228  err_stop_video:
2229         acpi_video_bus_stop_devices(video);
2230         acpi_video_bus_put_devices(video);
2231         kfree(video->attached_array);
2232         acpi_video_bus_remove_fs(device);
2233  err_free_video:
2234         kfree(video);
2235         device->driver_data = NULL;
2236
2237         return error;
2238 }
2239
2240 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2241 {
2242         acpi_status status = 0;
2243         struct acpi_video_bus *video = NULL;
2244
2245
2246         if (!device || !acpi_driver_data(device))
2247                 return -EINVAL;
2248
2249         video = acpi_driver_data(device);
2250
2251         acpi_video_bus_stop_devices(video);
2252
2253         status = acpi_remove_notify_handler(video->device->handle,
2254                                             ACPI_DEVICE_NOTIFY,
2255                                             acpi_video_bus_notify);
2256
2257         acpi_video_bus_put_devices(video);
2258         acpi_video_bus_remove_fs(device);
2259
2260         input_unregister_device(video->input);
2261         kfree(video->attached_array);
2262         kfree(video);
2263
2264         return 0;
2265 }
2266
2267 static int __init intel_opregion_present(void)
2268 {
2269 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2270         struct pci_dev *dev = NULL;
2271         u32 address;
2272
2273         for_each_pci_dev(dev) {
2274                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2275                         continue;
2276                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2277                         continue;
2278                 pci_read_config_dword(dev, 0xfc, &address);
2279                 if (!address)
2280                         continue;
2281                 return 1;
2282         }
2283 #endif
2284         return 0;
2285 }
2286
2287 int acpi_video_register(void)
2288 {
2289         int result = 0;
2290
2291         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2292         if (!acpi_video_dir)
2293                 return -ENODEV;
2294         acpi_video_dir->owner = THIS_MODULE;
2295
2296         result = acpi_bus_register_driver(&acpi_video_bus);
2297         if (result < 0) {
2298                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2299                 return -ENODEV;
2300         }
2301
2302         return 0;
2303 }
2304 EXPORT_SYMBOL(acpi_video_register);
2305
2306 /*
2307  * This is kind of nasty. Hardware using Intel chipsets may require
2308  * the video opregion code to be run first in order to initialise
2309  * state before any ACPI video calls are made. To handle this we defer
2310  * registration of the video class until the opregion code has run.
2311  */
2312
2313 static int __init acpi_video_init(void)
2314 {
2315         if (intel_opregion_present())
2316                 return 0;
2317
2318         return acpi_video_register();
2319 }
2320
2321 static void __exit acpi_video_exit(void)
2322 {
2323
2324         acpi_bus_unregister_driver(&acpi_video_bus);
2325
2326         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2327
2328         return;
2329 }
2330
2331 module_init(acpi_video_init);
2332 module_exit(acpi_video_exit);