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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 register_count = 0;
  80 static int acpi_video_bus_add(struct acpi_device *device);
  81 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  82 static int acpi_video_resume(struct acpi_device *device);
  83 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  84
  85 static const struct acpi_device_id video_device_ids[] = {
  86         {ACPI_VIDEO_HID, 0},
  87         {"", 0},
  88 };
  89 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  90
  91 static struct acpi_driver acpi_video_bus = {
  92         .name = "video",
  93         .class = ACPI_VIDEO_CLASS,
  94         .ids = video_device_ids,
  95         .ops = {
  96                 .add = acpi_video_bus_add,
  97                 .remove = acpi_video_bus_remove,
  98                 .resume = acpi_video_resume,
  99                 .notify = acpi_video_bus_notify,
 100                 },
 101 };
 102
 103 struct acpi_video_bus_flags {
 104         u8 multihead:1;         /* can switch video heads */
 105         u8 rom:1;               /* can retrieve a video rom */
 106         u8 post:1;              /* can configure the head to */
 107         u8 reserved:5;
 108 };
 109
 110 struct acpi_video_bus_cap {
 111         u8 _DOS:1;              /*Enable/Disable output switching */
 112         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 113         u8 _ROM:1;              /*Get ROM Data */
 114         u8 _GPD:1;              /*Get POST Device */
 115         u8 _SPD:1;              /*Set POST Device */
 116         u8 _VPO:1;              /*Video POST Options */
 117         u8 reserved:2;
 118 };
 119
 120 struct acpi_video_device_attrib {
 121         u32 display_index:4;    /* A zero-based instance of the Display */
 122         u32 display_port_attachment:4;  /*This field differentiates the display type */
 123         u32 display_type:4;     /*Describe the specific type in use */
 124         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 125         u32 bios_can_detect:1;  /*BIOS can detect the device */
 126         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 127                                    the VGA device. */
 128         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 129         u32 reserved:10;        /*Must be 0 */
 130         u32 device_id_scheme:1; /*Device ID Scheme */
 131 };
 132
 133 struct acpi_video_enumerated_device {
 134         union {
 135                 u32 int_val;
 136                 struct acpi_video_device_attrib attrib;
 137         } value;
 138         struct acpi_video_device *bind_info;
 139 };
 140
 141 struct acpi_video_bus {
 142         struct acpi_device *device;
 143         u8 dos_setting;
 144         struct acpi_video_enumerated_device *attached_array;
 145         u8 attached_count;
 146         struct acpi_video_bus_cap cap;
 147         struct acpi_video_bus_flags flags;
 148         struct list_head video_device_list;
 149         struct mutex device_list_lock;  /* protects video_device_list */
 150         struct proc_dir_entry *dir;
 151         struct input_dev *input;
 152         char phys[32];  /* for input device */
 153 };
 154
 155 struct acpi_video_device_flags {
 156         u8 crt:1;
 157         u8 lcd:1;
 158         u8 tvout:1;
 159         u8 dvi:1;
 160         u8 bios:1;
 161         u8 unknown:1;
 162         u8 reserved:2;
 163 };
 164
 165 struct acpi_video_device_cap {
 166         u8 _ADR:1;              /*Return the unique ID */
 167         u8 _BCL:1;              /*Query list of brightness control levels supported */
 168         u8 _BCM:1;              /*Set the brightness level */
 169         u8 _BQC:1;              /* Get current brightness level */
 170         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 171         u8 _DDC:1;              /*Return the EDID for this device */
 172         u8 _DCS:1;              /*Return status of output device */
 173         u8 _DGS:1;              /*Query graphics state */
 174         u8 _DSS:1;              /*Device state set */
 175 };
 176
 177 struct acpi_video_brightness_flags {
 178         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 179         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 180         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 181         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 182         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 183 };
 184
 185 struct acpi_video_device_brightness {
 186         int curr;
 187         int count;
 188         int *levels;
 189         struct acpi_video_brightness_flags flags;
 190 };
 191
 192 struct acpi_video_device {
 193         unsigned long device_id;
 194         struct acpi_video_device_flags flags;
 195         struct acpi_video_device_cap cap;
 196         struct list_head entry;
 197         struct acpi_video_bus *video;
 198         struct acpi_device *dev;
 199         struct acpi_video_device_brightness *brightness;
 200         struct backlight_device *backlight;
 201         struct thermal_cooling_device *cooling_dev;
 202         struct output_device *output_dev;
 203 };
 204
 205 /* bus */
 206 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 207 static const struct file_operations acpi_video_bus_info_fops = {
 208         .owner = THIS_MODULE,
 209         .open = acpi_video_bus_info_open_fs,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 216 static const struct file_operations acpi_video_bus_ROM_fops = {
 217         .owner = THIS_MODULE,
 218         .open = acpi_video_bus_ROM_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 225                                             struct file *file);
 226 static const struct file_operations acpi_video_bus_POST_info_fops = {
 227         .owner = THIS_MODULE,
 228         .open = acpi_video_bus_POST_info_open_fs,
 229         .read = seq_read,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 235 static ssize_t acpi_video_bus_write_POST(struct file *file,
 236         const char __user *buffer, size_t count, loff_t *data);
 237 static const struct file_operations acpi_video_bus_POST_fops = {
 238         .owner = THIS_MODULE,
 239         .open = acpi_video_bus_POST_open_fs,
 240         .read = seq_read,
 241         .write = acpi_video_bus_write_POST,
 242         .llseek = seq_lseek,
 243         .release = single_release,
 244 };
 245
 246 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 247 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 248         const char __user *buffer, size_t count, loff_t *data);
 249 static const struct file_operations acpi_video_bus_DOS_fops = {
 250         .owner = THIS_MODULE,
 251         .open = acpi_video_bus_DOS_open_fs,
 252         .read = seq_read,
 253         .write = acpi_video_bus_write_DOS,
 254         .llseek = seq_lseek,
 255         .release = single_release,
 256 };
 257
 258 /* device */
 259 static int acpi_video_device_info_open_fs(struct inode *inode,
 260                                           struct file *file);
 261 static const struct file_operations acpi_video_device_info_fops = {
 262         .owner = THIS_MODULE,
 263         .open = acpi_video_device_info_open_fs,
 264         .read = seq_read,
 265         .llseek = seq_lseek,
 266         .release = single_release,
 267 };
 268
 269 static int acpi_video_device_state_open_fs(struct inode *inode,
 270                                            struct file *file);
 271 static ssize_t acpi_video_device_write_state(struct file *file,
 272         const char __user *buffer, size_t count, loff_t *data);
 273 static const struct file_operations acpi_video_device_state_fops = {
 274         .owner = THIS_MODULE,
 275         .open = acpi_video_device_state_open_fs,
 276         .read = seq_read,
 277         .write = acpi_video_device_write_state,
 278         .llseek = seq_lseek,
 279         .release = single_release,
 280 };
 281
 282 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 283                                                 struct file *file);
 284 static ssize_t acpi_video_device_write_brightness(struct file *file,
 285         const char __user *buffer, size_t count, loff_t *data);
 286 static struct file_operations acpi_video_device_brightness_fops = {
 287         .owner = THIS_MODULE,
 288         .open = acpi_video_device_brightness_open_fs,
 289         .read = seq_read,
 290         .write = acpi_video_device_write_brightness,
 291         .llseek = seq_lseek,
 292         .release = single_release,
 293 };
 294
 295 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 296                                           struct file *file);
 297 static const struct file_operations acpi_video_device_EDID_fops = {
 298         .owner = THIS_MODULE,
 299         .open = acpi_video_device_EDID_open_fs,
 300         .read = seq_read,
 301         .llseek = seq_lseek,
 302         .release = single_release,
 303 };
 304
 305 static const char device_decode[][30] = {
 306         "motherboard VGA device",
 307         "PCI VGA device",
 308         "AGP VGA device",
 309         "UNKNOWN",
 310 };
 311
 312 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 313 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 314 static void acpi_video_device_bind(struct acpi_video_bus *video,
 315                                    struct acpi_video_device *device);
 316 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 317 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 318                         int level);
 319 static int acpi_video_device_lcd_get_level_current(
 320                         struct acpi_video_device *device,
 321                         unsigned long long *level);
 322 static int acpi_video_get_next_level(struct acpi_video_device *device,
 323                                      u32 level_current, u32 event);
 324 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 325                                          int event);
 326 static int acpi_video_device_get_state(struct acpi_video_device *device,
 327                             unsigned long long *state);
 328 static int acpi_video_output_get(struct output_device *od);
 329 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 330
 331 /*backlight device sysfs support*/
 332 static int acpi_video_get_brightness(struct backlight_device *bd)
 333 {
 334         unsigned long long cur_level;
 335         int i;
 336         struct acpi_video_device *vd =
 337                 (struct acpi_video_device *)bl_get_data(bd);
 338
 339         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 340                 return -EINVAL;
 341         for (i = 2; i < vd->brightness->count; i++) {
 342                 if (vd->brightness->levels[i] == cur_level)
 343                         /* The first two entries are special - see page 575
 344                            of the ACPI spec 3.0 */
 345                         return i-2;
 346         }
 347         return 0;
 348 }
 349
 350 static int acpi_video_set_brightness(struct backlight_device *bd)
 351 {
 352         int request_level = bd->props.brightness + 2;
 353         struct acpi_video_device *vd =
 354                 (struct acpi_video_device *)bl_get_data(bd);
 355
 356         return acpi_video_device_lcd_set_level(vd,
 357                                 vd->brightness->levels[request_level]);
 358 }
 359
 360 static struct backlight_ops acpi_backlight_ops = {
 361         .get_brightness = acpi_video_get_brightness,
 362         .update_status  = acpi_video_set_brightness,
 363 };
 364
 365 /*video output device sysfs support*/
 366 static int acpi_video_output_get(struct output_device *od)
 367 {
 368         unsigned long long state;
 369         struct acpi_video_device *vd =
 370                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 371         acpi_video_device_get_state(vd, &state);
 372         return (int)state;
 373 }
 374
 375 static int acpi_video_output_set(struct output_device *od)
 376 {
 377         unsigned long state = od->request_state;
 378         struct acpi_video_device *vd=
 379                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 380         return acpi_video_device_set_state(vd, state);
 381 }
 382
 383 static struct output_properties acpi_output_properties = {
 384         .set_state = acpi_video_output_set,
 385         .get_status = acpi_video_output_get,
 386 };
 387
 388
 389 /* thermal cooling device callbacks */
 390 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 391                                long *state)
 392 {
 393         struct acpi_device *device = cooling_dev->devdata;
 394         struct acpi_video_device *video = acpi_driver_data(device);
 395
 396         *state = video->brightness->count - 3;
 397         return 0;
 398 }
 399
 400 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 401                                long *state)
 402 {
 403         struct acpi_device *device = cooling_dev->devdata;
 404         struct acpi_video_device *video = acpi_driver_data(device);
 405         unsigned long long level;
 406         int offset;
 407
 408         if (acpi_video_device_lcd_get_level_current(video, &level))
 409                 return -EINVAL;
 410         for (offset = 2; offset < video->brightness->count; offset++)
 411                 if (level == video->brightness->levels[offset]) {
 412                         *state = video->brightness->count - offset - 1;
 413                         return 0;
 414                 }
 415
 416         return -EINVAL;
 417 }
 418
 419 static int
 420 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 421 {
 422         struct acpi_device *device = cooling_dev->devdata;
 423         struct acpi_video_device *video = acpi_driver_data(device);
 424         int level;
 425
 426         if ( state >= video->brightness->count - 2)
 427                 return -EINVAL;
 428
 429         state = video->brightness->count - state;
 430         level = video->brightness->levels[state -1];
 431         return acpi_video_device_lcd_set_level(video, level);
 432 }
 433
 434 static struct thermal_cooling_device_ops video_cooling_ops = {
 435         .get_max_state = video_get_max_state,
 436         .get_cur_state = video_get_cur_state,
 437         .set_cur_state = video_set_cur_state,
 438 };
 439
 440 /* --------------------------------------------------------------------------
 441                                Video Management
 442    -------------------------------------------------------------------------- */
 443
 444 /* device */
 445
 446 static int
 447 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 448 {
 449         int status;
 450
 451         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 452
 453         return status;
 454 }
 455
 456 static int
 457 acpi_video_device_get_state(struct acpi_video_device *device,
 458                             unsigned long long *state)
 459 {
 460         int status;
 461
 462         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 463
 464         return status;
 465 }
 466
 467 static int
 468 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 469 {
 470         int status;
 471         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 472         struct acpi_object_list args = { 1, &arg0 };
 473         unsigned long long ret;
 474
 475
 476         arg0.integer.value = state;
 477         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 478
 479         return status;
 480 }
 481
 482 static int
 483 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 484                                    union acpi_object **levels)
 485 {
 486         int status;
 487         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 488         union acpi_object *obj;
 489
 490
 491         *levels = NULL;
 492
 493         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 494         if (!ACPI_SUCCESS(status))
 495                 return status;
 496         obj = (union acpi_object *)buffer.pointer;
 497         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 498                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 499                 status = -EFAULT;
 500                 goto err;
 501         }
 502
 503         *levels = obj;
 504
 505         return 0;
 506
 507       err:
 508         kfree(buffer.pointer);
 509
 510         return status;
 511 }
 512
 513 static int
 514 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 515 {
 516         int status;
 517         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 518         struct acpi_object_list args = { 1, &arg0 };
 519         int state;
 520
 521         arg0.integer.value = level;
 522
 523         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 524                                       &args, NULL);
 525         if (ACPI_FAILURE(status)) {
 526                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 527                 return -EIO;
 528         }
 529
 530         device->brightness->curr = level;
 531         for (state = 2; state < device->brightness->count; state++)
 532                 if (level == device->brightness->levels[state]) {
 533                         if (device->backlight)
 534                                 device->backlight->props.brightness = state - 2;
 535                         return 0;
 536                 }
 537
 538         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 539         return -EINVAL;
 540 }
 541
 542 /*
 543  * For some buggy _BQC methods, we need to add a constant value to
 544  * the _BQC return value to get the actual current brightness level
 545  */
 546
 547 static int bqc_offset_aml_bug_workaround;
 548 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 549 {
 550         bqc_offset_aml_bug_workaround = 9;
 551         return 0;
 552 }
 553
 554 static struct dmi_system_id video_dmi_table[] __initdata = {
 555         /*
 556          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 557          */
 558         {
 559          .callback = video_set_bqc_offset,
 560          .ident = "Acer Aspire 5720",
 561          .matches = {
 562                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 563                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 564                 },
 565         },
 566         {
 567          .callback = video_set_bqc_offset,
 568          .ident = "Acer Aspire 5710Z",
 569          .matches = {
 570                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 571                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 572                 },
 573         },
 574         {
 575          .callback = video_set_bqc_offset,
 576          .ident = "eMachines E510",
 577          .matches = {
 578                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 579                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 580                 },
 581         },
 582         {
 583          .callback = video_set_bqc_offset,
 584          .ident = "Acer Aspire 5315",
 585          .matches = {
 586                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 587                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 588                 },
 589         },
 590         {
 591          .callback = video_set_bqc_offset,
 592          .ident = "Acer Aspire 7720",
 593          .matches = {
 594                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 595                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 596                 },
 597         },
 598         {}
 599 };
 600
 601 static int
 602 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 603                                         unsigned long long *level)
 604 {
 605         acpi_status status = AE_OK;
 606         int i;
 607
 608         if (device->cap._BQC || device->cap._BCQ) {
 609                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 610
 611                 status = acpi_evaluate_integer(device->dev->handle, buf,
 612                                                 NULL, level);
 613                 if (ACPI_SUCCESS(status)) {
 614                         if (device->brightness->flags._BQC_use_index) {
 615                                 if (device->brightness->flags._BCL_reversed)
 616                                         *level = device->brightness->count
 617                                                                  - 3 - (*level);
 618                                 *level = device->brightness->levels[*level + 2];
 619
 620                         }
 621                         *level += bqc_offset_aml_bug_workaround;
 622                         for (i = 2; i < device->brightness->count; i++)
 623                                 if (device->brightness->levels[i] == *level) {
 624                                         device->brightness->curr = *level;
 625                                         return 0;
 626                         }
 627                         /* BQC returned an invalid level. Stop using it.  */
 628                         ACPI_WARNING((AE_INFO, "%s returned an invalid level",
 629                                                 buf));
 630                         device->cap._BQC = device->cap._BCQ = 0;
 631                 } else {
 632                         /* Fixme:
 633                          * should we return an error or ignore this failure?
 634                          * dev->brightness->curr is a cached value which stores
 635                          * the correct current backlight level in most cases.
 636                          * ACPI video backlight still works w/ buggy _BQC.
 637                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 638                          */
 639                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 640                         device->cap._BQC = device->cap._BCQ = 0;
 641                 }
 642         }
 643
 644         *level = device->brightness->curr;
 645         return 0;
 646 }
 647
 648 static int
 649 acpi_video_device_EDID(struct acpi_video_device *device,
 650                        union acpi_object **edid, ssize_t length)
 651 {
 652         int status;
 653         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 654         union acpi_object *obj;
 655         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 656         struct acpi_object_list args = { 1, &arg0 };
 657
 658
 659         *edid = NULL;
 660
 661         if (!device)
 662                 return -ENODEV;
 663         if (length == 128)
 664                 arg0.integer.value = 1;
 665         else if (length == 256)
 666                 arg0.integer.value = 2;
 667         else
 668                 return -EINVAL;
 669
 670         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 671         if (ACPI_FAILURE(status))
 672                 return -ENODEV;
 673
 674         obj = buffer.pointer;
 675
 676         if (obj && obj->type == ACPI_TYPE_BUFFER)
 677                 *edid = obj;
 678         else {
 679                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 680                 status = -EFAULT;
 681                 kfree(obj);
 682         }
 683
 684         return status;
 685 }
 686
 687 /* bus */
 688
 689 static int
 690 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 691 {
 692         int status;
 693         unsigned long long tmp;
 694         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 695         struct acpi_object_list args = { 1, &arg0 };
 696
 697
 698         arg0.integer.value = option;
 699
 700         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 701         if (ACPI_SUCCESS(status))
 702                 status = tmp ? (-EINVAL) : (AE_OK);
 703
 704         return status;
 705 }
 706
 707 static int
 708 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 709 {
 710         int status;
 711
 712         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 713
 714         return status;
 715 }
 716
 717 static int
 718 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 719                             unsigned long long *options)
 720 {
 721         int status;
 722
 723         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 724         *options &= 3;
 725
 726         return status;
 727 }
 728
 729 /*
 730  *  Arg:
 731  *      video           : video bus device pointer
 732  *      bios_flag       :
 733  *              0.      The system BIOS should NOT automatically switch(toggle)
 734  *                      the active display output.
 735  *              1.      The system BIOS should automatically switch (toggle) the
 736  *                      active display output. No switch event.
 737  *              2.      The _DGS value should be locked.
 738  *              3.      The system BIOS should not automatically switch (toggle) the
 739  *                      active display output, but instead generate the display switch
 740  *                      event notify code.
 741  *      lcd_flag        :
 742  *              0.      The system BIOS should automatically control the brightness level
 743  *                      of the LCD when the power changes from AC to DC
 744  *              1.      The system BIOS should NOT automatically control the brightness
 745  *                      level of the LCD when the power changes from AC to DC.
 746  * Return Value:
 747  *              -1      wrong arg.
 748  */
 749
 750 static int
 751 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 752 {
 753         acpi_integer status = 0;
 754         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 755         struct acpi_object_list args = { 1, &arg0 };
 756
 757
 758         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 759                 status = -1;
 760                 goto Failed;
 761         }
 762         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 763         video->dos_setting = arg0.integer.value;
 764         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 765
 766       Failed:
 767         return status;
 768 }
 769
 770 /*
 771  * Simple comparison function used to sort backlight levels.
 772  */
 773
 774 static int
 775 acpi_video_cmp_level(const void *a, const void *b)
 776 {
 777         return *(int *)a - *(int *)b;
 778 }
 779
 780 /*
 781  *  Arg:
 782  *      device  : video output device (LCD, CRT, ..)
 783  *
 784  *  Return Value:
 785  *      Maximum brightness level
 786  *
 787  *  Allocate and initialize device->brightness.
 788  */
 789
 790 static int
 791 acpi_video_init_brightness(struct acpi_video_device *device)
 792 {
 793         union acpi_object *obj = NULL;
 794         int i, max_level = 0, count = 0, level_ac_battery = 0;
 795         unsigned long long level, level_old;
 796         union acpi_object *o;
 797         struct acpi_video_device_brightness *br = NULL;
 798         int result = -EINVAL;
 799
 800         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 801                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 802                                                 "LCD brightness level\n"));
 803                 goto out;
 804         }
 805
 806         if (obj->package.count < 2)
 807                 goto out;
 808
 809         br = kzalloc(sizeof(*br), GFP_KERNEL);
 810         if (!br) {
 811                 printk(KERN_ERR "can't allocate memory\n");
 812                 result = -ENOMEM;
 813                 goto out;
 814         }
 815
 816         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 817                                 GFP_KERNEL);
 818         if (!br->levels) {
 819                 result = -ENOMEM;
 820                 goto out_free;
 821         }
 822
 823         for (i = 0; i < obj->package.count; i++) {
 824                 o = (union acpi_object *)&obj->package.elements[i];
 825                 if (o->type != ACPI_TYPE_INTEGER) {
 826                         printk(KERN_ERR PREFIX "Invalid data\n");
 827                         continue;
 828                 }
 829                 br->levels[count] = (u32) o->integer.value;
 830
 831                 if (br->levels[count] > max_level)
 832                         max_level = br->levels[count];
 833                 count++;
 834         }
 835
 836         /*
 837          * some buggy BIOS don't export the levels
 838          * when machine is on AC/Battery in _BCL package.
 839          * In this case, the first two elements in _BCL packages
 840          * are also supported brightness levels that OS should take care of.
 841          */
 842         for (i = 2; i < count; i++) {
 843                 if (br->levels[i] == br->levels[0])
 844                         level_ac_battery++;
 845                 if (br->levels[i] == br->levels[1])
 846                         level_ac_battery++;
 847         }
 848
 849         if (level_ac_battery < 2) {
 850                 level_ac_battery = 2 - level_ac_battery;
 851                 br->flags._BCL_no_ac_battery_levels = 1;
 852                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 853                         br->levels[i] = br->levels[i - level_ac_battery];
 854                 count += level_ac_battery;
 855         } else if (level_ac_battery > 2)
 856                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 857
 858         /* Check if the _BCL package is in a reversed order */
 859         if (max_level == br->levels[2]) {
 860                 br->flags._BCL_reversed = 1;
 861                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 862                         acpi_video_cmp_level, NULL);
 863         } else if (max_level != br->levels[count - 1])
 864                 ACPI_ERROR((AE_INFO,
 865                             "Found unordered _BCL package\n"));
 866
 867         br->count = count;
 868         device->brightness = br;
 869
 870         /* Check the input/output of _BQC/_BCL/_BCM */
 871         if ((max_level < 100) && (max_level <= (count - 2)))
 872                 br->flags._BCL_use_index = 1;
 873
 874         /*
 875          * _BCM is always consistent with _BCL,
 876          * at least for all the laptops we have ever seen.
 877          */
 878         br->flags._BCM_use_index = br->flags._BCL_use_index;
 879
 880         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 881         br->curr = level = max_level;
 882
 883         if (!device->cap._BQC)
 884                 goto set_level;
 885
 886         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 887         if (result)
 888                 goto out_free_levels;
 889
 890         /*
 891          * Set the level to maximum and check if _BQC uses indexed value
 892          */
 893         result = acpi_video_device_lcd_set_level(device, max_level);
 894         if (result)
 895                 goto out_free_levels;
 896
 897         result = acpi_video_device_lcd_get_level_current(device, &level);
 898         if (result)
 899                 goto out_free_levels;
 900
 901         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 902
 903         if (!br->flags._BQC_use_index) {
 904                 /*
 905                  * Set the backlight to the initial state.
 906                  * On some buggy laptops, _BQC returns an uninitialized value
 907                  * when invoked for the first time, i.e. level_old is invalid.
 908                  * set the backlight to max_level in this case
 909                  */
 910                 for (i = 2; i < br->count; i++)
 911                         if (level_old == br->levels[i])
 912                                 level = level_old;
 913                 goto set_level;
 914         }
 915
 916         if (br->flags._BCL_reversed)
 917                 level_old = (br->count - 1) - level_old;
 918         level = br->levels[level_old];
 919
 920 set_level:
 921         result = acpi_video_device_lcd_set_level(device, level);
 922         if (result)
 923                 goto out_free_levels;
 924
 925         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 926                           "found %d brightness levels\n", count - 2));
 927         kfree(obj);
 928         return result;
 929
 930 out_free_levels:
 931         kfree(br->levels);
 932 out_free:
 933         kfree(br);
 934 out:
 935         device->brightness = NULL;
 936         kfree(obj);
 937         return result;
 938 }
 939
 940 /*
 941  *  Arg:
 942  *      device  : video output device (LCD, CRT, ..)
 943  *
 944  *  Return Value:
 945  *      None
 946  *
 947  *  Find out all required AML methods defined under the output
 948  *  device.
 949  */
 950
 951 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 952 {
 953         acpi_handle h_dummy1;
 954
 955         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 956                 device->cap._ADR = 1;
 957         }
 958         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 959                 device->cap._BCL = 1;
 960         }
 961         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 962                 device->cap._BCM = 1;
 963         }
 964         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 965                 device->cap._BQC = 1;
 966         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 967                                 &h_dummy1))) {
 968                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 969                 device->cap._BCQ = 1;
 970         }
 971
 972         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 973                 device->cap._DDC = 1;
 974         }
 975         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 976                 device->cap._DCS = 1;
 977         }
 978         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 979                 device->cap._DGS = 1;
 980         }
 981         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 982                 device->cap._DSS = 1;
 983         }
 984
 985         if (acpi_video_backlight_support()) {
 986                 int result;
 987                 static int count = 0;
 988                 char *name;
 989
 990                 result = acpi_video_init_brightness(device);
 991                 if (result)
 992                         return;
 993                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 994                 if (!name)
 995                         return;
 996
 997                 sprintf(name, "acpi_video%d", count++);
 998                 device->backlight = backlight_device_register(name,
 999                         NULL, device, &acpi_backlight_ops);
1000                 device->backlight->props.max_brightness = device->brightness->count-3;
1001                 kfree(name);
1002
1003                 result = sysfs_create_link(&device->backlight->dev.kobj,
1004                                            &device->dev->dev.kobj, "device");
1005                 if (result)
1006                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1007
1008                 device->cooling_dev = thermal_cooling_device_register("LCD",
1009                                         device->dev, &video_cooling_ops);
1010                 if (IS_ERR(device->cooling_dev)) {
1011                         /*
1012                          * Set cooling_dev to NULL so we don't crash trying to
1013                          * free it.
1014                          * Also, why the hell we are returning early and
1015                          * not attempt to register video output if cooling
1016                          * device registration failed?
1017                          * -- dtor
1018                          */
1019                         device->cooling_dev = NULL;
1020                         return;
1021                 }
1022
1023                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1024                          device->cooling_dev->id);
1025                 result = sysfs_create_link(&device->dev->dev.kobj,
1026                                 &device->cooling_dev->device.kobj,
1027                                 "thermal_cooling");
1028                 if (result)
1029                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1030                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1031                                 &device->dev->dev.kobj, "device");
1032                 if (result)
1033                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1034
1035         }
1036
1037         if (acpi_video_display_switch_support()) {
1038
1039                 if (device->cap._DCS && device->cap._DSS) {
1040                         static int count;
1041                         char *name;
1042                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1043                         if (!name)
1044                                 return;
1045                         sprintf(name, "acpi_video%d", count++);
1046                         device->output_dev = video_output_register(name,
1047                                         NULL, device, &acpi_output_properties);
1048                         kfree(name);
1049                 }
1050         }
1051 }
1052
1053 /*
1054  *  Arg:
1055  *      device  : video output device (VGA)
1056  *
1057  *  Return Value:
1058  *      None
1059  *
1060  *  Find out all required AML methods defined under the video bus device.
1061  */
1062
1063 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1064 {
1065         acpi_handle h_dummy1;
1066
1067         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1068                 video->cap._DOS = 1;
1069         }
1070         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1071                 video->cap._DOD = 1;
1072         }
1073         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1074                 video->cap._ROM = 1;
1075         }
1076         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1077                 video->cap._GPD = 1;
1078         }
1079         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1080                 video->cap._SPD = 1;
1081         }
1082         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1083                 video->cap._VPO = 1;
1084         }
1085 }
1086
1087 /*
1088  * Check whether the video bus device has required AML method to
1089  * support the desired features
1090  */
1091
1092 static int acpi_video_bus_check(struct acpi_video_bus *video)
1093 {
1094         acpi_status status = -ENOENT;
1095         struct pci_dev *dev;
1096
1097         if (!video)
1098                 return -EINVAL;
1099
1100         dev = acpi_get_pci_dev(video->device->handle);
1101         if (!dev)
1102                 return -ENODEV;
1103         pci_dev_put(dev);
1104
1105         /* Since there is no HID, CID and so on for VGA driver, we have
1106          * to check well known required nodes.
1107          */
1108
1109         /* Does this device support video switching? */
1110         if (video->cap._DOS) {
1111                 video->flags.multihead = 1;
1112                 status = 0;
1113         }
1114
1115         /* Does this device support retrieving a video ROM? */
1116         if (video->cap._ROM) {
1117                 video->flags.rom = 1;
1118                 status = 0;
1119         }
1120
1121         /* Does this device support configuring which video device to POST? */
1122         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1123                 video->flags.post = 1;
1124                 status = 0;
1125         }
1126
1127         return status;
1128 }
1129
1130 /* --------------------------------------------------------------------------
1131                               FS Interface (/proc)
1132    -------------------------------------------------------------------------- */
1133
1134 static struct proc_dir_entry *acpi_video_dir;
1135
1136 /* video devices */
1137
1138 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1139 {
1140         struct acpi_video_device *dev = seq->private;
1141
1142
1143         if (!dev)
1144                 goto end;
1145
1146         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1147         seq_printf(seq, "type:         ");
1148         if (dev->flags.crt)
1149                 seq_printf(seq, "CRT\n");
1150         else if (dev->flags.lcd)
1151                 seq_printf(seq, "LCD\n");
1152         else if (dev->flags.tvout)
1153                 seq_printf(seq, "TVOUT\n");
1154         else if (dev->flags.dvi)
1155                 seq_printf(seq, "DVI\n");
1156         else
1157                 seq_printf(seq, "UNKNOWN\n");
1158
1159         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1160
1161       end:
1162         return 0;
1163 }
1164
1165 static int
1166 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1167 {
1168         return single_open(file, acpi_video_device_info_seq_show,
1169                            PDE(inode)->data);
1170 }
1171
1172 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1173 {
1174         int status;
1175         struct acpi_video_device *dev = seq->private;
1176         unsigned long long state;
1177
1178
1179         if (!dev)
1180                 goto end;
1181
1182         status = acpi_video_device_get_state(dev, &state);
1183         seq_printf(seq, "state:     ");
1184         if (ACPI_SUCCESS(status))
1185                 seq_printf(seq, "0x%02llx\n", state);
1186         else
1187                 seq_printf(seq, "<not supported>\n");
1188
1189         status = acpi_video_device_query(dev, &state);
1190         seq_printf(seq, "query:     ");
1191         if (ACPI_SUCCESS(status))
1192                 seq_printf(seq, "0x%02llx\n", state);
1193         else
1194                 seq_printf(seq, "<not supported>\n");
1195
1196       end:
1197         return 0;
1198 }
1199
1200 static int
1201 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1202 {
1203         return single_open(file, acpi_video_device_state_seq_show,
1204                            PDE(inode)->data);
1205 }
1206
1207 static ssize_t
1208 acpi_video_device_write_state(struct file *file,
1209                               const char __user * buffer,
1210                               size_t count, loff_t * data)
1211 {
1212         int status;
1213         struct seq_file *m = file->private_data;
1214         struct acpi_video_device *dev = m->private;
1215         char str[12] = { 0 };
1216         u32 state = 0;
1217
1218
1219         if (!dev || count + 1 > sizeof str)
1220                 return -EINVAL;
1221
1222         if (copy_from_user(str, buffer, count))
1223                 return -EFAULT;
1224
1225         str[count] = 0;
1226         state = simple_strtoul(str, NULL, 0);
1227         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1228
1229         status = acpi_video_device_set_state(dev, state);
1230
1231         if (status)
1232                 return -EFAULT;
1233
1234         return count;
1235 }
1236
1237 static int
1238 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1239 {
1240         struct acpi_video_device *dev = seq->private;
1241         int i;
1242
1243
1244         if (!dev || !dev->brightness) {
1245                 seq_printf(seq, "<not supported>\n");
1246                 return 0;
1247         }
1248
1249         seq_printf(seq, "levels: ");
1250         for (i = 2; i < dev->brightness->count; i++)
1251                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1252         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1253
1254         return 0;
1255 }
1256
1257 static int
1258 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1259 {
1260         return single_open(file, acpi_video_device_brightness_seq_show,
1261                            PDE(inode)->data);
1262 }
1263
1264 static ssize_t
1265 acpi_video_device_write_brightness(struct file *file,
1266                                    const char __user * buffer,
1267                                    size_t count, loff_t * data)
1268 {
1269         struct seq_file *m = file->private_data;
1270         struct acpi_video_device *dev = m->private;
1271         char str[5] = { 0 };
1272         unsigned int level = 0;
1273         int i;
1274
1275
1276         if (!dev || !dev->brightness || count + 1 > sizeof str)
1277                 return -EINVAL;
1278
1279         if (copy_from_user(str, buffer, count))
1280                 return -EFAULT;
1281
1282         str[count] = 0;
1283         level = simple_strtoul(str, NULL, 0);
1284
1285         if (level > 100)
1286                 return -EFAULT;
1287
1288         /* validate through the list of available levels */
1289         for (i = 2; i < dev->brightness->count; i++)
1290                 if (level == dev->brightness->levels[i]) {
1291                         if (!acpi_video_device_lcd_set_level(dev, level))
1292                                 return count;
1293                         break;
1294                 }
1295
1296         return -EINVAL;
1297 }
1298
1299 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1300 {
1301         struct acpi_video_device *dev = seq->private;
1302         int status;
1303         int i;
1304         union acpi_object *edid = NULL;
1305
1306
1307         if (!dev)
1308                 goto out;
1309
1310         status = acpi_video_device_EDID(dev, &edid, 128);
1311         if (ACPI_FAILURE(status)) {
1312                 status = acpi_video_device_EDID(dev, &edid, 256);
1313         }
1314
1315         if (ACPI_FAILURE(status)) {
1316                 goto out;
1317         }
1318
1319         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1320                 for (i = 0; i < edid->buffer.length; i++)
1321                         seq_putc(seq, edid->buffer.pointer[i]);
1322         }
1323
1324       out:
1325         if (!edid)
1326                 seq_printf(seq, "<not supported>\n");
1327         else
1328                 kfree(edid);
1329
1330         return 0;
1331 }
1332
1333 static int
1334 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1335 {
1336         return single_open(file, acpi_video_device_EDID_seq_show,
1337                            PDE(inode)->data);
1338 }
1339
1340 static int acpi_video_device_add_fs(struct acpi_device *device)
1341 {
1342         struct proc_dir_entry *entry, *device_dir;
1343         struct acpi_video_device *vid_dev;
1344
1345         vid_dev = acpi_driver_data(device);
1346         if (!vid_dev)
1347                 return -ENODEV;
1348
1349         device_dir = proc_mkdir(acpi_device_bid(device),
1350                                 vid_dev->video->dir);
1351         if (!device_dir)
1352                 return -ENOMEM;
1353
1354         /* 'info' [R] */
1355         entry = proc_create_data("info", S_IRUGO, device_dir,
1356                         &acpi_video_device_info_fops, acpi_driver_data(device));
1357         if (!entry)
1358                 goto err_remove_dir;
1359
1360         /* 'state' [R/W] */
1361         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1362                                  device_dir,
1363                                  &acpi_video_device_state_fops,
1364                                  acpi_driver_data(device));
1365         if (!entry)
1366                 goto err_remove_info;
1367
1368         /* 'brightness' [R/W] */
1369         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1370                                  device_dir,
1371                                  &acpi_video_device_brightness_fops,
1372                                  acpi_driver_data(device));
1373         if (!entry)
1374                 goto err_remove_state;
1375
1376         /* 'EDID' [R] */
1377         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1378                                  &acpi_video_device_EDID_fops,
1379                                  acpi_driver_data(device));
1380         if (!entry)
1381                 goto err_remove_brightness;
1382
1383         acpi_device_dir(device) = device_dir;
1384
1385         return 0;
1386
1387  err_remove_brightness:
1388         remove_proc_entry("brightness", device_dir);
1389  err_remove_state:
1390         remove_proc_entry("state", device_dir);
1391  err_remove_info:
1392         remove_proc_entry("info", device_dir);
1393  err_remove_dir:
1394         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1395         return -ENOMEM;
1396 }
1397
1398 static int acpi_video_device_remove_fs(struct acpi_device *device)
1399 {
1400         struct acpi_video_device *vid_dev;
1401         struct proc_dir_entry *device_dir;
1402
1403         vid_dev = acpi_driver_data(device);
1404         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1405                 return -ENODEV;
1406
1407         device_dir = acpi_device_dir(device);
1408         if (device_dir) {
1409                 remove_proc_entry("info", device_dir);
1410                 remove_proc_entry("state", device_dir);
1411                 remove_proc_entry("brightness", device_dir);
1412                 remove_proc_entry("EDID", device_dir);
1413                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1414                 acpi_device_dir(device) = NULL;
1415         }
1416
1417         return 0;
1418 }
1419
1420 /* video bus */
1421 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1422 {
1423         struct acpi_video_bus *video = seq->private;
1424
1425
1426         if (!video)
1427                 goto end;
1428
1429         seq_printf(seq, "Switching heads:              %s\n",
1430                    video->flags.multihead ? "yes" : "no");
1431         seq_printf(seq, "Video ROM:                    %s\n",
1432                    video->flags.rom ? "yes" : "no");
1433         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1434                    video->flags.post ? "yes" : "no");
1435
1436       end:
1437         return 0;
1438 }
1439
1440 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1441 {
1442         return single_open(file, acpi_video_bus_info_seq_show,
1443                            PDE(inode)->data);
1444 }
1445
1446 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1447 {
1448         struct acpi_video_bus *video = seq->private;
1449
1450
1451         if (!video)
1452                 goto end;
1453
1454         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1455         seq_printf(seq, "<TODO>\n");
1456
1457       end:
1458         return 0;
1459 }
1460
1461 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1462 {
1463         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1464 }
1465
1466 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1467 {
1468         struct acpi_video_bus *video = seq->private;
1469         unsigned long long options;
1470         int status;
1471
1472
1473         if (!video)
1474                 goto end;
1475
1476         status = acpi_video_bus_POST_options(video, &options);
1477         if (ACPI_SUCCESS(status)) {
1478                 if (!(options & 1)) {
1479                         printk(KERN_WARNING PREFIX
1480                                "The motherboard VGA device is not listed as a possible POST device.\n");
1481                         printk(KERN_WARNING PREFIX
1482                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1483                 }
1484                 printk(KERN_WARNING "%llx\n", options);
1485                 seq_printf(seq, "can POST: <integrated video>");
1486                 if (options & 2)
1487                         seq_printf(seq, " <PCI video>");
1488                 if (options & 4)
1489                         seq_printf(seq, " <AGP video>");
1490                 seq_putc(seq, '\n');
1491         } else
1492                 seq_printf(seq, "<not supported>\n");
1493       end:
1494         return 0;
1495 }
1496
1497 static int
1498 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1499 {
1500         return single_open(file, acpi_video_bus_POST_info_seq_show,
1501                            PDE(inode)->data);
1502 }
1503
1504 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1505 {
1506         struct acpi_video_bus *video = seq->private;
1507         int status;
1508         unsigned long long id;
1509
1510
1511         if (!video)
1512                 goto end;
1513
1514         status = acpi_video_bus_get_POST(video, &id);
1515         if (!ACPI_SUCCESS(status)) {
1516                 seq_printf(seq, "<not supported>\n");
1517                 goto end;
1518         }
1519         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1520
1521       end:
1522         return 0;
1523 }
1524
1525 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1526 {
1527         struct acpi_video_bus *video = seq->private;
1528
1529
1530         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1531
1532         return 0;
1533 }
1534
1535 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1536 {
1537         return single_open(file, acpi_video_bus_POST_seq_show,
1538                            PDE(inode)->data);
1539 }
1540
1541 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1542 {
1543         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1544 }
1545
1546 static ssize_t
1547 acpi_video_bus_write_POST(struct file *file,
1548                           const char __user * buffer,
1549                           size_t count, loff_t * data)
1550 {
1551         int status;
1552         struct seq_file *m = file->private_data;
1553         struct acpi_video_bus *video = m->private;
1554         char str[12] = { 0 };
1555         unsigned long long opt, options;
1556
1557
1558         if (!video || count + 1 > sizeof str)
1559                 return -EINVAL;
1560
1561         status = acpi_video_bus_POST_options(video, &options);
1562         if (!ACPI_SUCCESS(status))
1563                 return -EINVAL;
1564
1565         if (copy_from_user(str, buffer, count))
1566                 return -EFAULT;
1567
1568         str[count] = 0;
1569         opt = strtoul(str, NULL, 0);
1570         if (opt > 3)
1571                 return -EFAULT;
1572
1573         /* just in case an OEM 'forgot' the motherboard... */
1574         options |= 1;
1575
1576         if (options & (1ul << opt)) {
1577                 status = acpi_video_bus_set_POST(video, opt);
1578                 if (!ACPI_SUCCESS(status))
1579                         return -EFAULT;
1580
1581         }
1582
1583         return count;
1584 }
1585
1586 static ssize_t
1587 acpi_video_bus_write_DOS(struct file *file,
1588                          const char __user * buffer,
1589                          size_t count, loff_t * data)
1590 {
1591         int status;
1592         struct seq_file *m = file->private_data;
1593         struct acpi_video_bus *video = m->private;
1594         char str[12] = { 0 };
1595         unsigned long opt;
1596
1597
1598         if (!video || count + 1 > sizeof str)
1599                 return -EINVAL;
1600
1601         if (copy_from_user(str, buffer, count))
1602                 return -EFAULT;
1603
1604         str[count] = 0;
1605         opt = strtoul(str, NULL, 0);
1606         if (opt > 7)
1607                 return -EFAULT;
1608
1609         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1610
1611         if (!ACPI_SUCCESS(status))
1612                 return -EFAULT;
1613
1614         return count;
1615 }
1616
1617 static int acpi_video_bus_add_fs(struct acpi_device *device)
1618 {
1619         struct acpi_video_bus *video = acpi_driver_data(device);
1620         struct proc_dir_entry *device_dir;
1621         struct proc_dir_entry *entry;
1622
1623         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1624         if (!device_dir)
1625                 return -ENOMEM;
1626
1627         /* 'info' [R] */
1628         entry = proc_create_data("info", S_IRUGO, device_dir,
1629                                  &acpi_video_bus_info_fops,
1630                                  acpi_driver_data(device));
1631         if (!entry)
1632                 goto err_remove_dir;
1633
1634         /* 'ROM' [R] */
1635         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1636                                  &acpi_video_bus_ROM_fops,
1637                                  acpi_driver_data(device));
1638         if (!entry)
1639                 goto err_remove_info;
1640
1641         /* 'POST_info' [R] */
1642         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1643                                  &acpi_video_bus_POST_info_fops,
1644                                  acpi_driver_data(device));
1645         if (!entry)
1646                 goto err_remove_rom;
1647
1648         /* 'POST' [R/W] */
1649         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1650                                  device_dir,
1651                                  &acpi_video_bus_POST_fops,
1652                                  acpi_driver_data(device));
1653         if (!entry)
1654                 goto err_remove_post_info;
1655
1656         /* 'DOS' [R/W] */
1657         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1658                                  device_dir,
1659                                  &acpi_video_bus_DOS_fops,
1660                                  acpi_driver_data(device));
1661         if (!entry)
1662                 goto err_remove_post;
1663
1664         video->dir = acpi_device_dir(device) = device_dir;
1665         return 0;
1666
1667  err_remove_post:
1668         remove_proc_entry("POST", device_dir);
1669  err_remove_post_info:
1670         remove_proc_entry("POST_info", device_dir);
1671  err_remove_rom:
1672         remove_proc_entry("ROM", device_dir);
1673  err_remove_info:
1674         remove_proc_entry("info", device_dir);
1675  err_remove_dir:
1676         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1677         return -ENOMEM;
1678 }
1679
1680 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1681 {
1682         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1683
1684         if (device_dir) {
1685                 remove_proc_entry("info", device_dir);
1686                 remove_proc_entry("ROM", device_dir);
1687                 remove_proc_entry("POST_info", device_dir);
1688                 remove_proc_entry("POST", device_dir);
1689                 remove_proc_entry("DOS", device_dir);
1690                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1691                 acpi_device_dir(device) = NULL;
1692         }
1693
1694         return 0;
1695 }
1696
1697 /* --------------------------------------------------------------------------
1698                                  Driver Interface
1699    -------------------------------------------------------------------------- */
1700
1701 /* device interface */
1702 static struct acpi_video_device_attrib*
1703 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1704 {
1705         struct acpi_video_enumerated_device *ids;
1706         int i;
1707
1708         for (i = 0; i < video->attached_count; i++) {
1709                 ids = &video->attached_array[i];
1710                 if ((ids->value.int_val & 0xffff) == device_id)
1711                         return &ids->value.attrib;
1712         }
1713
1714         return NULL;
1715 }
1716
1717 static int
1718 acpi_video_bus_get_one_device(struct acpi_device *device,
1719                               struct acpi_video_bus *video)
1720 {
1721         unsigned long long device_id;
1722         int status;
1723         struct acpi_video_device *data;
1724         struct acpi_video_device_attrib* attribute;
1725
1726         if (!device || !video)
1727                 return -EINVAL;
1728
1729         status =
1730             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1731         if (ACPI_SUCCESS(status)) {
1732
1733                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1734                 if (!data)
1735                         return -ENOMEM;
1736
1737                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1738                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1739                 device->driver_data = data;
1740
1741                 data->device_id = device_id;
1742                 data->video = video;
1743                 data->dev = device;
1744
1745                 attribute = acpi_video_get_device_attr(video, device_id);
1746
1747                 if((attribute != NULL) && attribute->device_id_scheme) {
1748                         switch (attribute->display_type) {
1749                         case ACPI_VIDEO_DISPLAY_CRT:
1750                                 data->flags.crt = 1;
1751                                 break;
1752                         case ACPI_VIDEO_DISPLAY_TV:
1753                                 data->flags.tvout = 1;
1754                                 break;
1755                         case ACPI_VIDEO_DISPLAY_DVI:
1756                                 data->flags.dvi = 1;
1757                                 break;
1758                         case ACPI_VIDEO_DISPLAY_LCD:
1759                                 data->flags.lcd = 1;
1760                                 break;
1761                         default:
1762                                 data->flags.unknown = 1;
1763                                 break;
1764                         }
1765                         if(attribute->bios_can_detect)
1766                                 data->flags.bios = 1;
1767                 } else
1768                         data->flags.unknown = 1;
1769
1770                 acpi_video_device_bind(video, data);
1771                 acpi_video_device_find_cap(data);
1772
1773                 status = acpi_install_notify_handler(device->handle,
1774                                                      ACPI_DEVICE_NOTIFY,
1775                                                      acpi_video_device_notify,
1776                                                      data);
1777                 if (ACPI_FAILURE(status)) {
1778                         printk(KERN_ERR PREFIX
1779                                           "Error installing notify handler\n");
1780                         if(data->brightness)
1781                                 kfree(data->brightness->levels);
1782                         kfree(data->brightness);
1783                         kfree(data);
1784                         return -ENODEV;
1785                 }
1786
1787                 mutex_lock(&video->device_list_lock);
1788                 list_add_tail(&data->entry, &video->video_device_list);
1789                 mutex_unlock(&video->device_list_lock);
1790
1791                 acpi_video_device_add_fs(device);
1792
1793                 return 0;
1794         }
1795
1796         return -ENOENT;
1797 }
1798
1799 /*
1800  *  Arg:
1801  *      video   : video bus device
1802  *
1803  *  Return:
1804  *      none
1805  *
1806  *  Enumerate the video device list of the video bus,
1807  *  bind the ids with the corresponding video devices
1808  *  under the video bus.
1809  */
1810
1811 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1812 {
1813         struct acpi_video_device *dev;
1814
1815         mutex_lock(&video->device_list_lock);
1816
1817         list_for_each_entry(dev, &video->video_device_list, entry)
1818                 acpi_video_device_bind(video, dev);
1819
1820         mutex_unlock(&video->device_list_lock);
1821 }
1822
1823 /*
1824  *  Arg:
1825  *      video   : video bus device
1826  *      device  : video output device under the video
1827  *              bus
1828  *
1829  *  Return:
1830  *      none
1831  *
1832  *  Bind the ids with the corresponding video devices
1833  *  under the video bus.
1834  */
1835
1836 static void
1837 acpi_video_device_bind(struct acpi_video_bus *video,
1838                        struct acpi_video_device *device)
1839 {
1840         struct acpi_video_enumerated_device *ids;
1841         int i;
1842
1843         for (i = 0; i < video->attached_count; i++) {
1844                 ids = &video->attached_array[i];
1845                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1846                         ids->bind_info = device;
1847                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1848                 }
1849         }
1850 }
1851
1852 /*
1853  *  Arg:
1854  *      video   : video bus device
1855  *
1856  *  Return:
1857  *      < 0     : error
1858  *
1859  *  Call _DOD to enumerate all devices attached to display adapter
1860  *
1861  */
1862
1863 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1864 {
1865         int status;
1866         int count;
1867         int i;
1868         struct acpi_video_enumerated_device *active_list;
1869         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1870         union acpi_object *dod = NULL;
1871         union acpi_object *obj;
1872
1873         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1874         if (!ACPI_SUCCESS(status)) {
1875                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1876                 return status;
1877         }
1878
1879         dod = buffer.pointer;
1880         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1881                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1882                 status = -EFAULT;
1883                 goto out;
1884         }
1885
1886         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1887                           dod->package.count));
1888
1889         active_list = kcalloc(1 + dod->package.count,
1890                               sizeof(struct acpi_video_enumerated_device),
1891                               GFP_KERNEL);
1892         if (!active_list) {
1893                 status = -ENOMEM;
1894                 goto out;
1895         }
1896
1897         count = 0;
1898         for (i = 0; i < dod->package.count; i++) {
1899                 obj = &dod->package.elements[i];
1900
1901                 if (obj->type != ACPI_TYPE_INTEGER) {
1902                         printk(KERN_ERR PREFIX
1903                                 "Invalid _DOD data in element %d\n", i);
1904                         continue;
1905                 }
1906
1907                 active_list[count].value.int_val = obj->integer.value;
1908                 active_list[count].bind_info = NULL;
1909                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1910                                   (int)obj->integer.value));
1911                 count++;
1912         }
1913
1914         kfree(video->attached_array);
1915
1916         video->attached_array = active_list;
1917         video->attached_count = count;
1918
1919  out:
1920         kfree(buffer.pointer);
1921         return status;
1922 }
1923
1924 static int
1925 acpi_video_get_next_level(struct acpi_video_device *device,
1926                           u32 level_current, u32 event)
1927 {
1928         int min, max, min_above, max_below, i, l, delta = 255;
1929         max = max_below = 0;
1930         min = min_above = 255;
1931         /* Find closest level to level_current */
1932         for (i = 2; i < device->brightness->count; i++) {
1933                 l = device->brightness->levels[i];
1934                 if (abs(l - level_current) < abs(delta)) {
1935                         delta = l - level_current;
1936                         if (!delta)
1937                                 break;
1938                 }
1939         }
1940         /* Ajust level_current to closest available level */
1941         level_current += delta;
1942         for (i = 2; i < device->brightness->count; i++) {
1943                 l = device->brightness->levels[i];
1944                 if (l < min)
1945                         min = l;
1946                 if (l > max)
1947                         max = l;
1948                 if (l < min_above && l > level_current)
1949                         min_above = l;
1950                 if (l > max_below && l < level_current)
1951                         max_below = l;
1952         }
1953
1954         switch (event) {
1955         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1956                 return (level_current < max) ? min_above : min;
1957         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1958                 return (level_current < max) ? min_above : max;
1959         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1960                 return (level_current > min) ? max_below : min;
1961         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1962         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1963                 return 0;
1964         default:
1965                 return level_current;
1966         }
1967 }
1968
1969 static int
1970 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1971 {
1972         unsigned long long level_current, level_next;
1973         int result = -EINVAL;
1974
1975         if (!device->brightness)
1976                 goto out;
1977
1978         result = acpi_video_device_lcd_get_level_current(device,
1979                                                          &level_current);
1980         if (result)
1981                 goto out;
1982
1983         level_next = acpi_video_get_next_level(device, level_current, event);
1984
1985         result = acpi_video_device_lcd_set_level(device, level_next);
1986
1987 out:
1988         if (result)
1989                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1990
1991         return result;
1992 }
1993
1994 static int
1995 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1996                            struct acpi_device *device)
1997 {
1998         int status = 0;
1999         struct acpi_device *dev;
2000
2001         acpi_video_device_enumerate(video);
2002
2003         list_for_each_entry(dev, &device->children, node) {
2004
2005                 status = acpi_video_bus_get_one_device(dev, video);
2006                 if (ACPI_FAILURE(status)) {
2007                         printk(KERN_WARNING PREFIX
2008                                         "Cant attach device");
2009                         continue;
2010                 }
2011         }
2012         return status;
2013 }
2014
2015 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2016 {
2017         acpi_status status;
2018         struct acpi_video_bus *video;
2019
2020
2021         if (!device || !device->video)
2022                 return -ENOENT;
2023
2024         video = device->video;
2025
2026         acpi_video_device_remove_fs(device->dev);
2027
2028         status = acpi_remove_notify_handler(device->dev->handle,
2029                                             ACPI_DEVICE_NOTIFY,
2030                                             acpi_video_device_notify);
2031         sysfs_remove_link(&device->backlight->dev.kobj, "device");
2032         backlight_device_unregister(device->backlight);
2033         if (device->cooling_dev) {
2034                 sysfs_remove_link(&device->dev->dev.kobj,
2035                                   "thermal_cooling");
2036                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2037                                   "device");
2038                 thermal_cooling_device_unregister(device->cooling_dev);
2039                 device->cooling_dev = NULL;
2040         }
2041         video_output_unregister(device->output_dev);
2042
2043         return 0;
2044 }
2045
2046 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2047 {
2048         int status;
2049         struct acpi_video_device *dev, *next;
2050
2051         mutex_lock(&video->device_list_lock);
2052
2053         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2054
2055                 status = acpi_video_bus_put_one_device(dev);
2056                 if (ACPI_FAILURE(status))
2057                         printk(KERN_WARNING PREFIX
2058                                "hhuuhhuu bug in acpi video driver.\n");
2059
2060                 if (dev->brightness) {
2061                         kfree(dev->brightness->levels);
2062                         kfree(dev->brightness);
2063                 }
2064                 list_del(&dev->entry);
2065                 kfree(dev);
2066         }
2067
2068         mutex_unlock(&video->device_list_lock);
2069
2070         return 0;
2071 }
2072
2073 /* acpi_video interface */
2074
2075 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2076 {
2077         return acpi_video_bus_DOS(video, 0, 0);
2078 }
2079
2080 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2081 {
2082         return acpi_video_bus_DOS(video, 0, 1);
2083 }
2084
2085 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2086 {
2087         struct acpi_video_bus *video = acpi_driver_data(device);
2088         struct input_dev *input;
2089         int keycode;
2090
2091         if (!video)
2092                 return;
2093
2094         input = video->input;
2095
2096         switch (event) {
2097         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2098                                          * most likely via hotkey. */
2099                 acpi_bus_generate_proc_event(device, event, 0);
2100                 keycode = KEY_SWITCHVIDEOMODE;
2101                 break;
2102
2103         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2104                                          * connector. */
2105                 acpi_video_device_enumerate(video);
2106                 acpi_video_device_rebind(video);
2107                 acpi_bus_generate_proc_event(device, event, 0);
2108                 keycode = KEY_SWITCHVIDEOMODE;
2109                 break;
2110
2111         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2112                 acpi_bus_generate_proc_event(device, event, 0);
2113                 keycode = KEY_SWITCHVIDEOMODE;
2114                 break;
2115         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2116                 acpi_bus_generate_proc_event(device, event, 0);
2117                 keycode = KEY_VIDEO_NEXT;
2118                 break;
2119         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2120                 acpi_bus_generate_proc_event(device, event, 0);
2121                 keycode = KEY_VIDEO_PREV;
2122                 break;
2123
2124         default:
2125                 keycode = KEY_UNKNOWN;
2126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2127                                   "Unsupported event [0x%x]\n", event));
2128                 break;
2129         }
2130
2131         acpi_notifier_call_chain(device, event, 0);
2132         input_report_key(input, keycode, 1);
2133         input_sync(input);
2134         input_report_key(input, keycode, 0);
2135         input_sync(input);
2136
2137         return;
2138 }
2139
2140 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2141 {
2142         struct acpi_video_device *video_device = data;
2143         struct acpi_device *device = NULL;
2144         struct acpi_video_bus *bus;
2145         struct input_dev *input;
2146         int keycode;
2147
2148         if (!video_device)
2149                 return;
2150
2151         device = video_device->dev;
2152         bus = video_device->video;
2153         input = bus->input;
2154
2155         switch (event) {
2156         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2157                 if (brightness_switch_enabled)
2158                         acpi_video_switch_brightness(video_device, event);
2159                 acpi_bus_generate_proc_event(device, event, 0);
2160                 keycode = KEY_BRIGHTNESS_CYCLE;
2161                 break;
2162         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2163                 if (brightness_switch_enabled)
2164                         acpi_video_switch_brightness(video_device, event);
2165                 acpi_bus_generate_proc_event(device, event, 0);
2166                 keycode = KEY_BRIGHTNESSUP;
2167                 break;
2168         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2169                 if (brightness_switch_enabled)
2170                         acpi_video_switch_brightness(video_device, event);
2171                 acpi_bus_generate_proc_event(device, event, 0);
2172                 keycode = KEY_BRIGHTNESSDOWN;
2173                 break;
2174         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2175                 if (brightness_switch_enabled)
2176                         acpi_video_switch_brightness(video_device, event);
2177                 acpi_bus_generate_proc_event(device, event, 0);
2178                 keycode = KEY_BRIGHTNESS_ZERO;
2179                 break;
2180         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2181                 if (brightness_switch_enabled)
2182                         acpi_video_switch_brightness(video_device, event);
2183                 acpi_bus_generate_proc_event(device, event, 0);
2184                 keycode = KEY_DISPLAY_OFF;
2185                 break;
2186         default:
2187                 keycode = KEY_UNKNOWN;
2188                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2189                                   "Unsupported event [0x%x]\n", event));
2190                 break;
2191         }
2192
2193         acpi_notifier_call_chain(device, event, 0);
2194         input_report_key(input, keycode, 1);
2195         input_sync(input);
2196         input_report_key(input, keycode, 0);
2197         input_sync(input);
2198
2199         return;
2200 }
2201
2202 static int instance;
2203 static int acpi_video_resume(struct acpi_device *device)
2204 {
2205         struct acpi_video_bus *video;
2206         struct acpi_video_device *video_device;
2207         int i;
2208
2209         if (!device || !acpi_driver_data(device))
2210                 return -EINVAL;
2211
2212         video = acpi_driver_data(device);
2213
2214         for (i = 0; i < video->attached_count; i++) {
2215                 video_device = video->attached_array[i].bind_info;
2216                 if (video_device && video_device->backlight)
2217                         acpi_video_set_brightness(video_device->backlight);
2218         }
2219         return AE_OK;
2220 }
2221
2222 static int acpi_video_bus_add(struct acpi_device *device)
2223 {
2224         struct acpi_video_bus *video;
2225         struct input_dev *input;
2226         int error;
2227
2228         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2229         if (!video)
2230                 return -ENOMEM;
2231
2232         /* a hack to fix the duplicate name "VID" problem on T61 */
2233         if (!strcmp(device->pnp.bus_id, "VID")) {
2234                 if (instance)
2235                         device->pnp.bus_id[3] = '0' + instance;
2236                 instance ++;
2237         }
2238         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2239         if (!strcmp(device->pnp.bus_id, "VGA")) {
2240                 if (instance)
2241                         device->pnp.bus_id[3] = '0' + instance;
2242                 instance++;
2243         }
2244
2245         video->device = device;
2246         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2247         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2248         device->driver_data = video;
2249
2250         acpi_video_bus_find_cap(video);
2251         error = acpi_video_bus_check(video);
2252         if (error)
2253                 goto err_free_video;
2254
2255         error = acpi_video_bus_add_fs(device);
2256         if (error)
2257                 goto err_free_video;
2258
2259         mutex_init(&video->device_list_lock);
2260         INIT_LIST_HEAD(&video->video_device_list);
2261
2262         acpi_video_bus_get_devices(video, device);
2263         acpi_video_bus_start_devices(video);
2264
2265         video->input = input = input_allocate_device();
2266         if (!input) {
2267                 error = -ENOMEM;
2268                 goto err_stop_video;
2269         }
2270
2271         snprintf(video->phys, sizeof(video->phys),
2272                 "%s/video/input0", acpi_device_hid(video->device));
2273
2274         input->name = acpi_device_name(video->device);
2275         input->phys = video->phys;
2276         input->id.bustype = BUS_HOST;
2277         input->id.product = 0x06;
2278         input->dev.parent = &device->dev;
2279         input->evbit[0] = BIT(EV_KEY);
2280         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2281         set_bit(KEY_VIDEO_NEXT, input->keybit);
2282         set_bit(KEY_VIDEO_PREV, input->keybit);
2283         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2284         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2285         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2286         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2287         set_bit(KEY_DISPLAY_OFF, input->keybit);
2288         set_bit(KEY_UNKNOWN, input->keybit);
2289
2290         error = input_register_device(input);
2291         if (error)
2292                 goto err_free_input_dev;
2293
2294         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2295                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2296                video->flags.multihead ? "yes" : "no",
2297                video->flags.rom ? "yes" : "no",
2298                video->flags.post ? "yes" : "no");
2299
2300         return 0;
2301
2302  err_free_input_dev:
2303         input_free_device(input);
2304  err_stop_video:
2305         acpi_video_bus_stop_devices(video);
2306         acpi_video_bus_put_devices(video);
2307         kfree(video->attached_array);
2308         acpi_video_bus_remove_fs(device);
2309  err_free_video:
2310         kfree(video);
2311         device->driver_data = NULL;
2312
2313         return error;
2314 }
2315
2316 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2317 {
2318         struct acpi_video_bus *video = NULL;
2319
2320
2321         if (!device || !acpi_driver_data(device))
2322                 return -EINVAL;
2323
2324         video = acpi_driver_data(device);
2325
2326         acpi_video_bus_stop_devices(video);
2327         acpi_video_bus_put_devices(video);
2328         acpi_video_bus_remove_fs(device);
2329
2330         input_unregister_device(video->input);
2331         kfree(video->attached_array);
2332         kfree(video);
2333
2334         return 0;
2335 }
2336
2337 static int __init intel_opregion_present(void)
2338 {
2339 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2340         struct pci_dev *dev = NULL;
2341         u32 address;
2342
2343         for_each_pci_dev(dev) {
2344                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2345                         continue;
2346                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2347                         continue;
2348                 pci_read_config_dword(dev, 0xfc, &address);
2349                 if (!address)
2350                         continue;
2351                 return 1;
2352         }
2353 #endif
2354         return 0;
2355 }
2356
2357 int acpi_video_register(void)
2358 {
2359         int result = 0;
2360         if (register_count) {
2361                 /*
2362                  * if the function of acpi_video_register is already called,
2363                  * don't register the acpi_vide_bus again and return no error.
2364                  */
2365                 return 0;
2366         }
2367
2368         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2369         if (!acpi_video_dir)
2370                 return -ENODEV;
2371
2372         result = acpi_bus_register_driver(&acpi_video_bus);
2373         if (result < 0) {
2374                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2375                 return -ENODEV;
2376         }
2377
2378         /*
2379          * When the acpi_video_bus is loaded successfully, increase
2380          * the counter reference.
2381          */
2382         register_count = 1;
2383
2384         return 0;
2385 }
2386 EXPORT_SYMBOL(acpi_video_register);
2387
2388 void acpi_video_unregister(void)
2389 {
2390         if (!register_count) {
2391                 /*
2392                  * If the acpi video bus is already unloaded, don't
2393                  * unload it again and return directly.
2394                  */
2395                 return;
2396         }
2397         acpi_bus_unregister_driver(&acpi_video_bus);
2398
2399         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2400
2401         register_count = 0;
2402
2403         return;
2404 }
2405 EXPORT_SYMBOL(acpi_video_unregister);
2406
2407 /*
2408  * This is kind of nasty. Hardware using Intel chipsets may require
2409  * the video opregion code to be run first in order to initialise
2410  * state before any ACPI video calls are made. To handle this we defer
2411  * registration of the video class until the opregion code has run.
2412  */
2413
2414 static int __init acpi_video_init(void)
2415 {
2416         dmi_check_system(video_dmi_table);
2417
2418         if (intel_opregion_present())
2419                 return 0;
2420
2421         return acpi_video_register();
2422 }
2423
2424 static void __exit acpi_video_exit(void)
2425 {
2426         acpi_video_unregister();
2427
2428         return;
2429 }
2430
2431 module_init(acpi_video_init);
2432 module_exit(acpi_video_exit);