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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 *cdev;
 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 *cdev, unsigned
 391                                long *state)
 392 {
 393         struct acpi_device *device = cdev->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 *cdev, unsigned
 401                                long *state)
 402 {
 403         struct acpi_device *device = cdev->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 *cdev, unsigned long state)
 421 {
 422         struct acpi_device *device = cdev->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
 607         if (device->cap._BQC || device->cap._BCQ) {
 608                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 609
 610                 status = acpi_evaluate_integer(device->dev->handle, buf,
 611                                                 NULL, level);
 612                 if (ACPI_SUCCESS(status)) {
 613                         if (device->brightness->flags._BQC_use_index) {
 614                                 if (device->brightness->flags._BCL_reversed)
 615                                         *level = device->brightness->count
 616                                                                  - 3 - (*level);
 617                                 *level = device->brightness->levels[*level + 2];
 618
 619                         }
 620                         *level += bqc_offset_aml_bug_workaround;
 621                         device->brightness->curr = *level;
 622                         return 0;
 623                 } else {
 624                         /* Fixme:
 625                          * should we return an error or ignore this failure?
 626                          * dev->brightness->curr is a cached value which stores
 627                          * the correct current backlight level in most cases.
 628                          * ACPI video backlight still works w/ buggy _BQC.
 629                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 630                          */
 631                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 632                         device->cap._BQC = device->cap._BCQ = 0;
 633                 }
 634         }
 635
 636         *level = device->brightness->curr;
 637         return 0;
 638 }
 639
 640 static int
 641 acpi_video_device_EDID(struct acpi_video_device *device,
 642                        union acpi_object **edid, ssize_t length)
 643 {
 644         int status;
 645         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 646         union acpi_object *obj;
 647         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 648         struct acpi_object_list args = { 1, &arg0 };
 649
 650
 651         *edid = NULL;
 652
 653         if (!device)
 654                 return -ENODEV;
 655         if (length == 128)
 656                 arg0.integer.value = 1;
 657         else if (length == 256)
 658                 arg0.integer.value = 2;
 659         else
 660                 return -EINVAL;
 661
 662         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 663         if (ACPI_FAILURE(status))
 664                 return -ENODEV;
 665
 666         obj = buffer.pointer;
 667
 668         if (obj && obj->type == ACPI_TYPE_BUFFER)
 669                 *edid = obj;
 670         else {
 671                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 672                 status = -EFAULT;
 673                 kfree(obj);
 674         }
 675
 676         return status;
 677 }
 678
 679 /* bus */
 680
 681 static int
 682 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 683 {
 684         int status;
 685         unsigned long long tmp;
 686         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 687         struct acpi_object_list args = { 1, &arg0 };
 688
 689
 690         arg0.integer.value = option;
 691
 692         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 693         if (ACPI_SUCCESS(status))
 694                 status = tmp ? (-EINVAL) : (AE_OK);
 695
 696         return status;
 697 }
 698
 699 static int
 700 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 701 {
 702         int status;
 703
 704         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 705
 706         return status;
 707 }
 708
 709 static int
 710 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 711                             unsigned long long *options)
 712 {
 713         int status;
 714
 715         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 716         *options &= 3;
 717
 718         return status;
 719 }
 720
 721 /*
 722  *  Arg:
 723  *      video           : video bus device pointer
 724  *      bios_flag       :
 725  *              0.      The system BIOS should NOT automatically switch(toggle)
 726  *                      the active display output.
 727  *              1.      The system BIOS should automatically switch (toggle) the
 728  *                      active display output. No switch event.
 729  *              2.      The _DGS value should be locked.
 730  *              3.      The system BIOS should not automatically switch (toggle) the
 731  *                      active display output, but instead generate the display switch
 732  *                      event notify code.
 733  *      lcd_flag        :
 734  *              0.      The system BIOS should automatically control the brightness level
 735  *                      of the LCD when the power changes from AC to DC
 736  *              1.      The system BIOS should NOT automatically control the brightness
 737  *                      level of the LCD when the power changes from AC to DC.
 738  * Return Value:
 739  *              -1      wrong arg.
 740  */
 741
 742 static int
 743 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 744 {
 745         acpi_integer status = 0;
 746         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 747         struct acpi_object_list args = { 1, &arg0 };
 748
 749
 750         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 751                 status = -1;
 752                 goto Failed;
 753         }
 754         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 755         video->dos_setting = arg0.integer.value;
 756         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 757
 758       Failed:
 759         return status;
 760 }
 761
 762 /*
 763  * Simple comparison function used to sort backlight levels.
 764  */
 765
 766 static int
 767 acpi_video_cmp_level(const void *a, const void *b)
 768 {
 769         return *(int *)a - *(int *)b;
 770 }
 771
 772 /*
 773  *  Arg:
 774  *      device  : video output device (LCD, CRT, ..)
 775  *
 776  *  Return Value:
 777  *      Maximum brightness level
 778  *
 779  *  Allocate and initialize device->brightness.
 780  */
 781
 782 static int
 783 acpi_video_init_brightness(struct acpi_video_device *device)
 784 {
 785         union acpi_object *obj = NULL;
 786         int i, max_level = 0, count = 0, level_ac_battery = 0;
 787         unsigned long long level, level_old;
 788         union acpi_object *o;
 789         struct acpi_video_device_brightness *br = NULL;
 790         int result = -EINVAL;
 791
 792         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 793                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 794                                                 "LCD brightness level\n"));
 795                 goto out;
 796         }
 797
 798         if (obj->package.count < 2)
 799                 goto out;
 800
 801         br = kzalloc(sizeof(*br), GFP_KERNEL);
 802         if (!br) {
 803                 printk(KERN_ERR "can't allocate memory\n");
 804                 result = -ENOMEM;
 805                 goto out;
 806         }
 807
 808         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 809                                 GFP_KERNEL);
 810         if (!br->levels) {
 811                 result = -ENOMEM;
 812                 goto out_free;
 813         }
 814
 815         for (i = 0; i < obj->package.count; i++) {
 816                 o = (union acpi_object *)&obj->package.elements[i];
 817                 if (o->type != ACPI_TYPE_INTEGER) {
 818                         printk(KERN_ERR PREFIX "Invalid data\n");
 819                         continue;
 820                 }
 821                 br->levels[count] = (u32) o->integer.value;
 822
 823                 if (br->levels[count] > max_level)
 824                         max_level = br->levels[count];
 825                 count++;
 826         }
 827
 828         /*
 829          * some buggy BIOS don't export the levels
 830          * when machine is on AC/Battery in _BCL package.
 831          * In this case, the first two elements in _BCL packages
 832          * are also supported brightness levels that OS should take care of.
 833          */
 834         for (i = 2; i < count; i++) {
 835                 if (br->levels[i] == br->levels[0])
 836                         level_ac_battery++;
 837                 if (br->levels[i] == br->levels[1])
 838                         level_ac_battery++;
 839         }
 840
 841         if (level_ac_battery < 2) {
 842                 level_ac_battery = 2 - level_ac_battery;
 843                 br->flags._BCL_no_ac_battery_levels = 1;
 844                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 845                         br->levels[i] = br->levels[i - level_ac_battery];
 846                 count += level_ac_battery;
 847         } else if (level_ac_battery > 2)
 848                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 849
 850         /* Check if the _BCL package is in a reversed order */
 851         if (max_level == br->levels[2]) {
 852                 br->flags._BCL_reversed = 1;
 853                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 854                         acpi_video_cmp_level, NULL);
 855         } else if (max_level != br->levels[count - 1])
 856                 ACPI_ERROR((AE_INFO,
 857                             "Found unordered _BCL package\n"));
 858
 859         br->count = count;
 860         device->brightness = br;
 861
 862         /* Check the input/output of _BQC/_BCL/_BCM */
 863         if ((max_level < 100) && (max_level <= (count - 2)))
 864                 br->flags._BCL_use_index = 1;
 865
 866         /*
 867          * _BCM is always consistent with _BCL,
 868          * at least for all the laptops we have ever seen.
 869          */
 870         br->flags._BCM_use_index = br->flags._BCL_use_index;
 871
 872         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 873         br->curr = level_old = max_level;
 874
 875         if (!device->cap._BQC)
 876                 goto set_level;
 877
 878         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 879         if (result)
 880                 goto out_free_levels;
 881
 882         /*
 883          * Set the level to maximum and check if _BQC uses indexed value
 884          */
 885         result = acpi_video_device_lcd_set_level(device, max_level);
 886         if (result)
 887                 goto out_free_levels;
 888
 889         result = acpi_video_device_lcd_get_level_current(device, &level);
 890         if (result)
 891                 goto out_free_levels;
 892
 893         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 894
 895         if (!br->flags._BQC_use_index)
 896                 goto set_level;
 897
 898         if (br->flags._BCL_reversed)
 899                 level_old = (br->count - 1) - level_old;
 900         level_old = br->levels[level_old];
 901
 902 set_level:
 903         result = acpi_video_device_lcd_set_level(device, level_old);
 904         if (result)
 905                 goto out_free_levels;
 906
 907         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 908                           "found %d brightness levels\n", count - 2));
 909         kfree(obj);
 910         return result;
 911
 912 out_free_levels:
 913         kfree(br->levels);
 914 out_free:
 915         kfree(br);
 916 out:
 917         device->brightness = NULL;
 918         kfree(obj);
 919         return result;
 920 }
 921
 922 /*
 923  *  Arg:
 924  *      device  : video output device (LCD, CRT, ..)
 925  *
 926  *  Return Value:
 927  *      None
 928  *
 929  *  Find out all required AML methods defined under the output
 930  *  device.
 931  */
 932
 933 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 934 {
 935         acpi_handle h_dummy1;
 936
 937         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 938                 device->cap._ADR = 1;
 939         }
 940         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 941                 device->cap._BCL = 1;
 942         }
 943         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 944                 device->cap._BCM = 1;
 945         }
 946         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 947                 device->cap._BQC = 1;
 948         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 949                                 &h_dummy1))) {
 950                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 951                 device->cap._BCQ = 1;
 952         }
 953
 954         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 955                 device->cap._DDC = 1;
 956         }
 957         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 958                 device->cap._DCS = 1;
 959         }
 960         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 961                 device->cap._DGS = 1;
 962         }
 963         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 964                 device->cap._DSS = 1;
 965         }
 966
 967         if (acpi_video_backlight_support()) {
 968                 int result;
 969                 static int count = 0;
 970                 char *name;
 971
 972                 result = acpi_video_init_brightness(device);
 973                 if (result)
 974                         return;
 975                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 976                 if (!name)
 977                         return;
 978
 979                 sprintf(name, "acpi_video%d", count++);
 980                 device->backlight = backlight_device_register(name,
 981                         NULL, device, &acpi_backlight_ops);
 982                 device->backlight->props.max_brightness = device->brightness->count-3;
 983                 kfree(name);
 984
 985                 result = sysfs_create_link(&device->backlight->dev.kobj,
 986                                            &device->dev->dev.kobj, "device");
 987                 if (result)
 988                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 989
 990                 device->cdev = thermal_cooling_device_register("LCD",
 991                                         device->dev, &video_cooling_ops);
 992                 if (IS_ERR(device->cdev))
 993                         return;
 994
 995                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 996                          device->cdev->id);
 997                 result = sysfs_create_link(&device->dev->dev.kobj,
 998                                 &device->cdev->device.kobj,
 999                                 "thermal_cooling");
1000                 if (result)
1001                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1002                 result = sysfs_create_link(&device->cdev->device.kobj,
1003                                 &device->dev->dev.kobj, "device");
1004                 if (result)
1005                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1006
1007         }
1008
1009         if (acpi_video_display_switch_support()) {
1010
1011                 if (device->cap._DCS && device->cap._DSS) {
1012                         static int count;
1013                         char *name;
1014                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1015                         if (!name)
1016                                 return;
1017                         sprintf(name, "acpi_video%d", count++);
1018                         device->output_dev = video_output_register(name,
1019                                         NULL, device, &acpi_output_properties);
1020                         kfree(name);
1021                 }
1022         }
1023 }
1024
1025 /*
1026  *  Arg:
1027  *      device  : video output device (VGA)
1028  *
1029  *  Return Value:
1030  *      None
1031  *
1032  *  Find out all required AML methods defined under the video bus device.
1033  */
1034
1035 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1036 {
1037         acpi_handle h_dummy1;
1038
1039         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1040                 video->cap._DOS = 1;
1041         }
1042         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1043                 video->cap._DOD = 1;
1044         }
1045         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1046                 video->cap._ROM = 1;
1047         }
1048         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1049                 video->cap._GPD = 1;
1050         }
1051         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1052                 video->cap._SPD = 1;
1053         }
1054         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1055                 video->cap._VPO = 1;
1056         }
1057 }
1058
1059 /*
1060  * Check whether the video bus device has required AML method to
1061  * support the desired features
1062  */
1063
1064 static int acpi_video_bus_check(struct acpi_video_bus *video)
1065 {
1066         acpi_status status = -ENOENT;
1067         struct pci_dev *dev;
1068
1069         if (!video)
1070                 return -EINVAL;
1071
1072         dev = acpi_get_pci_dev(video->device->handle);
1073         if (!dev)
1074                 return -ENODEV;
1075         pci_dev_put(dev);
1076
1077         /* Since there is no HID, CID and so on for VGA driver, we have
1078          * to check well known required nodes.
1079          */
1080
1081         /* Does this device support video switching? */
1082         if (video->cap._DOS) {
1083                 video->flags.multihead = 1;
1084                 status = 0;
1085         }
1086
1087         /* Does this device support retrieving a video ROM? */
1088         if (video->cap._ROM) {
1089                 video->flags.rom = 1;
1090                 status = 0;
1091         }
1092
1093         /* Does this device support configuring which video device to POST? */
1094         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1095                 video->flags.post = 1;
1096                 status = 0;
1097         }
1098
1099         return status;
1100 }
1101
1102 /* --------------------------------------------------------------------------
1103                               FS Interface (/proc)
1104    -------------------------------------------------------------------------- */
1105
1106 static struct proc_dir_entry *acpi_video_dir;
1107
1108 /* video devices */
1109
1110 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1111 {
1112         struct acpi_video_device *dev = seq->private;
1113
1114
1115         if (!dev)
1116                 goto end;
1117
1118         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1119         seq_printf(seq, "type:         ");
1120         if (dev->flags.crt)
1121                 seq_printf(seq, "CRT\n");
1122         else if (dev->flags.lcd)
1123                 seq_printf(seq, "LCD\n");
1124         else if (dev->flags.tvout)
1125                 seq_printf(seq, "TVOUT\n");
1126         else if (dev->flags.dvi)
1127                 seq_printf(seq, "DVI\n");
1128         else
1129                 seq_printf(seq, "UNKNOWN\n");
1130
1131         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1132
1133       end:
1134         return 0;
1135 }
1136
1137 static int
1138 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1139 {
1140         return single_open(file, acpi_video_device_info_seq_show,
1141                            PDE(inode)->data);
1142 }
1143
1144 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1145 {
1146         int status;
1147         struct acpi_video_device *dev = seq->private;
1148         unsigned long long state;
1149
1150
1151         if (!dev)
1152                 goto end;
1153
1154         status = acpi_video_device_get_state(dev, &state);
1155         seq_printf(seq, "state:     ");
1156         if (ACPI_SUCCESS(status))
1157                 seq_printf(seq, "0x%02llx\n", state);
1158         else
1159                 seq_printf(seq, "<not supported>\n");
1160
1161         status = acpi_video_device_query(dev, &state);
1162         seq_printf(seq, "query:     ");
1163         if (ACPI_SUCCESS(status))
1164                 seq_printf(seq, "0x%02llx\n", state);
1165         else
1166                 seq_printf(seq, "<not supported>\n");
1167
1168       end:
1169         return 0;
1170 }
1171
1172 static int
1173 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1174 {
1175         return single_open(file, acpi_video_device_state_seq_show,
1176                            PDE(inode)->data);
1177 }
1178
1179 static ssize_t
1180 acpi_video_device_write_state(struct file *file,
1181                               const char __user * buffer,
1182                               size_t count, loff_t * data)
1183 {
1184         int status;
1185         struct seq_file *m = file->private_data;
1186         struct acpi_video_device *dev = m->private;
1187         char str[12] = { 0 };
1188         u32 state = 0;
1189
1190
1191         if (!dev || count + 1 > sizeof str)
1192                 return -EINVAL;
1193
1194         if (copy_from_user(str, buffer, count))
1195                 return -EFAULT;
1196
1197         str[count] = 0;
1198         state = simple_strtoul(str, NULL, 0);
1199         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1200
1201         status = acpi_video_device_set_state(dev, state);
1202
1203         if (status)
1204                 return -EFAULT;
1205
1206         return count;
1207 }
1208
1209 static int
1210 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1211 {
1212         struct acpi_video_device *dev = seq->private;
1213         int i;
1214
1215
1216         if (!dev || !dev->brightness) {
1217                 seq_printf(seq, "<not supported>\n");
1218                 return 0;
1219         }
1220
1221         seq_printf(seq, "levels: ");
1222         for (i = 2; i < dev->brightness->count; i++)
1223                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1224         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1225
1226         return 0;
1227 }
1228
1229 static int
1230 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1231 {
1232         return single_open(file, acpi_video_device_brightness_seq_show,
1233                            PDE(inode)->data);
1234 }
1235
1236 static ssize_t
1237 acpi_video_device_write_brightness(struct file *file,
1238                                    const char __user * buffer,
1239                                    size_t count, loff_t * data)
1240 {
1241         struct seq_file *m = file->private_data;
1242         struct acpi_video_device *dev = m->private;
1243         char str[5] = { 0 };
1244         unsigned int level = 0;
1245         int i;
1246
1247
1248         if (!dev || !dev->brightness || count + 1 > sizeof str)
1249                 return -EINVAL;
1250
1251         if (copy_from_user(str, buffer, count))
1252                 return -EFAULT;
1253
1254         str[count] = 0;
1255         level = simple_strtoul(str, NULL, 0);
1256
1257         if (level > 100)
1258                 return -EFAULT;
1259
1260         /* validate through the list of available levels */
1261         for (i = 2; i < dev->brightness->count; i++)
1262                 if (level == dev->brightness->levels[i]) {
1263                         if (!acpi_video_device_lcd_set_level(dev, level))
1264                                 return count;
1265                         break;
1266                 }
1267
1268         return -EINVAL;
1269 }
1270
1271 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1272 {
1273         struct acpi_video_device *dev = seq->private;
1274         int status;
1275         int i;
1276         union acpi_object *edid = NULL;
1277
1278
1279         if (!dev)
1280                 goto out;
1281
1282         status = acpi_video_device_EDID(dev, &edid, 128);
1283         if (ACPI_FAILURE(status)) {
1284                 status = acpi_video_device_EDID(dev, &edid, 256);
1285         }
1286
1287         if (ACPI_FAILURE(status)) {
1288                 goto out;
1289         }
1290
1291         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1292                 for (i = 0; i < edid->buffer.length; i++)
1293                         seq_putc(seq, edid->buffer.pointer[i]);
1294         }
1295
1296       out:
1297         if (!edid)
1298                 seq_printf(seq, "<not supported>\n");
1299         else
1300                 kfree(edid);
1301
1302         return 0;
1303 }
1304
1305 static int
1306 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1307 {
1308         return single_open(file, acpi_video_device_EDID_seq_show,
1309                            PDE(inode)->data);
1310 }
1311
1312 static int acpi_video_device_add_fs(struct acpi_device *device)
1313 {
1314         struct proc_dir_entry *entry, *device_dir;
1315         struct acpi_video_device *vid_dev;
1316
1317         vid_dev = acpi_driver_data(device);
1318         if (!vid_dev)
1319                 return -ENODEV;
1320
1321         device_dir = proc_mkdir(acpi_device_bid(device),
1322                                 vid_dev->video->dir);
1323         if (!device_dir)
1324                 return -ENOMEM;
1325
1326         /* 'info' [R] */
1327         entry = proc_create_data("info", S_IRUGO, device_dir,
1328                         &acpi_video_device_info_fops, acpi_driver_data(device));
1329         if (!entry)
1330                 goto err_remove_dir;
1331
1332         /* 'state' [R/W] */
1333         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1334                                  device_dir,
1335                                  &acpi_video_device_state_fops,
1336                                  acpi_driver_data(device));
1337         if (!entry)
1338                 goto err_remove_info;
1339
1340         /* 'brightness' [R/W] */
1341         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1342                                  device_dir,
1343                                  &acpi_video_device_brightness_fops,
1344                                  acpi_driver_data(device));
1345         if (!entry)
1346                 goto err_remove_state;
1347
1348         /* 'EDID' [R] */
1349         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1350                                  &acpi_video_device_EDID_fops,
1351                                  acpi_driver_data(device));
1352         if (!entry)
1353                 goto err_remove_brightness;
1354
1355         acpi_device_dir(device) = device_dir;
1356
1357         return 0;
1358
1359  err_remove_brightness:
1360         remove_proc_entry("brightness", device_dir);
1361  err_remove_state:
1362         remove_proc_entry("state", device_dir);
1363  err_remove_info:
1364         remove_proc_entry("info", device_dir);
1365  err_remove_dir:
1366         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1367         return -ENOMEM;
1368 }
1369
1370 static int acpi_video_device_remove_fs(struct acpi_device *device)
1371 {
1372         struct acpi_video_device *vid_dev;
1373         struct proc_dir_entry *device_dir;
1374
1375         vid_dev = acpi_driver_data(device);
1376         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1377                 return -ENODEV;
1378
1379         device_dir = acpi_device_dir(device);
1380         if (device_dir) {
1381                 remove_proc_entry("info", device_dir);
1382                 remove_proc_entry("state", device_dir);
1383                 remove_proc_entry("brightness", device_dir);
1384                 remove_proc_entry("EDID", device_dir);
1385                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1386                 acpi_device_dir(device) = NULL;
1387         }
1388
1389         return 0;
1390 }
1391
1392 /* video bus */
1393 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1394 {
1395         struct acpi_video_bus *video = seq->private;
1396
1397
1398         if (!video)
1399                 goto end;
1400
1401         seq_printf(seq, "Switching heads:              %s\n",
1402                    video->flags.multihead ? "yes" : "no");
1403         seq_printf(seq, "Video ROM:                    %s\n",
1404                    video->flags.rom ? "yes" : "no");
1405         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1406                    video->flags.post ? "yes" : "no");
1407
1408       end:
1409         return 0;
1410 }
1411
1412 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1413 {
1414         return single_open(file, acpi_video_bus_info_seq_show,
1415                            PDE(inode)->data);
1416 }
1417
1418 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1419 {
1420         struct acpi_video_bus *video = seq->private;
1421
1422
1423         if (!video)
1424                 goto end;
1425
1426         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1427         seq_printf(seq, "<TODO>\n");
1428
1429       end:
1430         return 0;
1431 }
1432
1433 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1434 {
1435         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1436 }
1437
1438 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1439 {
1440         struct acpi_video_bus *video = seq->private;
1441         unsigned long long options;
1442         int status;
1443
1444
1445         if (!video)
1446                 goto end;
1447
1448         status = acpi_video_bus_POST_options(video, &options);
1449         if (ACPI_SUCCESS(status)) {
1450                 if (!(options & 1)) {
1451                         printk(KERN_WARNING PREFIX
1452                                "The motherboard VGA device is not listed as a possible POST device.\n");
1453                         printk(KERN_WARNING PREFIX
1454                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1455                 }
1456                 printk(KERN_WARNING "%llx\n", options);
1457                 seq_printf(seq, "can POST: <integrated video>");
1458                 if (options & 2)
1459                         seq_printf(seq, " <PCI video>");
1460                 if (options & 4)
1461                         seq_printf(seq, " <AGP video>");
1462                 seq_putc(seq, '\n');
1463         } else
1464                 seq_printf(seq, "<not supported>\n");
1465       end:
1466         return 0;
1467 }
1468
1469 static int
1470 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1471 {
1472         return single_open(file, acpi_video_bus_POST_info_seq_show,
1473                            PDE(inode)->data);
1474 }
1475
1476 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1477 {
1478         struct acpi_video_bus *video = seq->private;
1479         int status;
1480         unsigned long long id;
1481
1482
1483         if (!video)
1484                 goto end;
1485
1486         status = acpi_video_bus_get_POST(video, &id);
1487         if (!ACPI_SUCCESS(status)) {
1488                 seq_printf(seq, "<not supported>\n");
1489                 goto end;
1490         }
1491         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1492
1493       end:
1494         return 0;
1495 }
1496
1497 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1498 {
1499         struct acpi_video_bus *video = seq->private;
1500
1501
1502         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1503
1504         return 0;
1505 }
1506
1507 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1508 {
1509         return single_open(file, acpi_video_bus_POST_seq_show,
1510                            PDE(inode)->data);
1511 }
1512
1513 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1514 {
1515         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1516 }
1517
1518 static ssize_t
1519 acpi_video_bus_write_POST(struct file *file,
1520                           const char __user * buffer,
1521                           size_t count, loff_t * data)
1522 {
1523         int status;
1524         struct seq_file *m = file->private_data;
1525         struct acpi_video_bus *video = m->private;
1526         char str[12] = { 0 };
1527         unsigned long long opt, options;
1528
1529
1530         if (!video || count + 1 > sizeof str)
1531                 return -EINVAL;
1532
1533         status = acpi_video_bus_POST_options(video, &options);
1534         if (!ACPI_SUCCESS(status))
1535                 return -EINVAL;
1536
1537         if (copy_from_user(str, buffer, count))
1538                 return -EFAULT;
1539
1540         str[count] = 0;
1541         opt = strtoul(str, NULL, 0);
1542         if (opt > 3)
1543                 return -EFAULT;
1544
1545         /* just in case an OEM 'forgot' the motherboard... */
1546         options |= 1;
1547
1548         if (options & (1ul << opt)) {
1549                 status = acpi_video_bus_set_POST(video, opt);
1550                 if (!ACPI_SUCCESS(status))
1551                         return -EFAULT;
1552
1553         }
1554
1555         return count;
1556 }
1557
1558 static ssize_t
1559 acpi_video_bus_write_DOS(struct file *file,
1560                          const char __user * buffer,
1561                          size_t count, loff_t * data)
1562 {
1563         int status;
1564         struct seq_file *m = file->private_data;
1565         struct acpi_video_bus *video = m->private;
1566         char str[12] = { 0 };
1567         unsigned long opt;
1568
1569
1570         if (!video || count + 1 > sizeof str)
1571                 return -EINVAL;
1572
1573         if (copy_from_user(str, buffer, count))
1574                 return -EFAULT;
1575
1576         str[count] = 0;
1577         opt = strtoul(str, NULL, 0);
1578         if (opt > 7)
1579                 return -EFAULT;
1580
1581         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1582
1583         if (!ACPI_SUCCESS(status))
1584                 return -EFAULT;
1585
1586         return count;
1587 }
1588
1589 static int acpi_video_bus_add_fs(struct acpi_device *device)
1590 {
1591         struct acpi_video_bus *video = acpi_driver_data(device);
1592         struct proc_dir_entry *device_dir;
1593         struct proc_dir_entry *entry;
1594
1595         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1596         if (!device_dir)
1597                 return -ENOMEM;
1598
1599         /* 'info' [R] */
1600         entry = proc_create_data("info", S_IRUGO, device_dir,
1601                                  &acpi_video_bus_info_fops,
1602                                  acpi_driver_data(device));
1603         if (!entry)
1604                 goto err_remove_dir;
1605
1606         /* 'ROM' [R] */
1607         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1608                                  &acpi_video_bus_ROM_fops,
1609                                  acpi_driver_data(device));
1610         if (!entry)
1611                 goto err_remove_info;
1612
1613         /* 'POST_info' [R] */
1614         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1615                                  &acpi_video_bus_POST_info_fops,
1616                                  acpi_driver_data(device));
1617         if (!entry)
1618                 goto err_remove_rom;
1619
1620         /* 'POST' [R/W] */
1621         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1622                                  device_dir,
1623                                  &acpi_video_bus_POST_fops,
1624                                  acpi_driver_data(device));
1625         if (!entry)
1626                 goto err_remove_post_info;
1627
1628         /* 'DOS' [R/W] */
1629         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1630                                  device_dir,
1631                                  &acpi_video_bus_DOS_fops,
1632                                  acpi_driver_data(device));
1633         if (!entry)
1634                 goto err_remove_post;
1635
1636         video->dir = acpi_device_dir(device) = device_dir;
1637         return 0;
1638
1639  err_remove_post:
1640         remove_proc_entry("POST", device_dir);
1641  err_remove_post_info:
1642         remove_proc_entry("POST_info", device_dir);
1643  err_remove_rom:
1644         remove_proc_entry("ROM", device_dir);
1645  err_remove_info:
1646         remove_proc_entry("info", device_dir);
1647  err_remove_dir:
1648         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1649         return -ENOMEM;
1650 }
1651
1652 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1653 {
1654         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1655
1656         if (device_dir) {
1657                 remove_proc_entry("info", device_dir);
1658                 remove_proc_entry("ROM", device_dir);
1659                 remove_proc_entry("POST_info", device_dir);
1660                 remove_proc_entry("POST", device_dir);
1661                 remove_proc_entry("DOS", device_dir);
1662                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1663                 acpi_device_dir(device) = NULL;
1664         }
1665
1666         return 0;
1667 }
1668
1669 /* --------------------------------------------------------------------------
1670                                  Driver Interface
1671    -------------------------------------------------------------------------- */
1672
1673 /* device interface */
1674 static struct acpi_video_device_attrib*
1675 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1676 {
1677         struct acpi_video_enumerated_device *ids;
1678         int i;
1679
1680         for (i = 0; i < video->attached_count; i++) {
1681                 ids = &video->attached_array[i];
1682                 if ((ids->value.int_val & 0xffff) == device_id)
1683                         return &ids->value.attrib;
1684         }
1685
1686         return NULL;
1687 }
1688
1689 static int
1690 acpi_video_bus_get_one_device(struct acpi_device *device,
1691                               struct acpi_video_bus *video)
1692 {
1693         unsigned long long device_id;
1694         int status;
1695         struct acpi_video_device *data;
1696         struct acpi_video_device_attrib* attribute;
1697
1698         if (!device || !video)
1699                 return -EINVAL;
1700
1701         status =
1702             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1703         if (ACPI_SUCCESS(status)) {
1704
1705                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1706                 if (!data)
1707                         return -ENOMEM;
1708
1709                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1710                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1711                 device->driver_data = data;
1712
1713                 data->device_id = device_id;
1714                 data->video = video;
1715                 data->dev = device;
1716
1717                 attribute = acpi_video_get_device_attr(video, device_id);
1718
1719                 if((attribute != NULL) && attribute->device_id_scheme) {
1720                         switch (attribute->display_type) {
1721                         case ACPI_VIDEO_DISPLAY_CRT:
1722                                 data->flags.crt = 1;
1723                                 break;
1724                         case ACPI_VIDEO_DISPLAY_TV:
1725                                 data->flags.tvout = 1;
1726                                 break;
1727                         case ACPI_VIDEO_DISPLAY_DVI:
1728                                 data->flags.dvi = 1;
1729                                 break;
1730                         case ACPI_VIDEO_DISPLAY_LCD:
1731                                 data->flags.lcd = 1;
1732                                 break;
1733                         default:
1734                                 data->flags.unknown = 1;
1735                                 break;
1736                         }
1737                         if(attribute->bios_can_detect)
1738                                 data->flags.bios = 1;
1739                 } else
1740                         data->flags.unknown = 1;
1741
1742                 acpi_video_device_bind(video, data);
1743                 acpi_video_device_find_cap(data);
1744
1745                 status = acpi_install_notify_handler(device->handle,
1746                                                      ACPI_DEVICE_NOTIFY,
1747                                                      acpi_video_device_notify,
1748                                                      data);
1749                 if (ACPI_FAILURE(status)) {
1750                         printk(KERN_ERR PREFIX
1751                                           "Error installing notify handler\n");
1752                         if(data->brightness)
1753                                 kfree(data->brightness->levels);
1754                         kfree(data->brightness);
1755                         kfree(data);
1756                         return -ENODEV;
1757                 }
1758
1759                 mutex_lock(&video->device_list_lock);
1760                 list_add_tail(&data->entry, &video->video_device_list);
1761                 mutex_unlock(&video->device_list_lock);
1762
1763                 acpi_video_device_add_fs(device);
1764
1765                 return 0;
1766         }
1767
1768         return -ENOENT;
1769 }
1770
1771 /*
1772  *  Arg:
1773  *      video   : video bus device
1774  *
1775  *  Return:
1776  *      none
1777  *
1778  *  Enumerate the video device list of the video bus,
1779  *  bind the ids with the corresponding video devices
1780  *  under the video bus.
1781  */
1782
1783 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1784 {
1785         struct acpi_video_device *dev;
1786
1787         mutex_lock(&video->device_list_lock);
1788
1789         list_for_each_entry(dev, &video->video_device_list, entry)
1790                 acpi_video_device_bind(video, dev);
1791
1792         mutex_unlock(&video->device_list_lock);
1793 }
1794
1795 /*
1796  *  Arg:
1797  *      video   : video bus device
1798  *      device  : video output device under the video
1799  *              bus
1800  *
1801  *  Return:
1802  *      none
1803  *
1804  *  Bind the ids with the corresponding video devices
1805  *  under the video bus.
1806  */
1807
1808 static void
1809 acpi_video_device_bind(struct acpi_video_bus *video,
1810                        struct acpi_video_device *device)
1811 {
1812         struct acpi_video_enumerated_device *ids;
1813         int i;
1814
1815         for (i = 0; i < video->attached_count; i++) {
1816                 ids = &video->attached_array[i];
1817                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1818                         ids->bind_info = device;
1819                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1820                 }
1821         }
1822 }
1823
1824 /*
1825  *  Arg:
1826  *      video   : video bus device
1827  *
1828  *  Return:
1829  *      < 0     : error
1830  *
1831  *  Call _DOD to enumerate all devices attached to display adapter
1832  *
1833  */
1834
1835 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1836 {
1837         int status;
1838         int count;
1839         int i;
1840         struct acpi_video_enumerated_device *active_list;
1841         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1842         union acpi_object *dod = NULL;
1843         union acpi_object *obj;
1844
1845         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1846         if (!ACPI_SUCCESS(status)) {
1847                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1848                 return status;
1849         }
1850
1851         dod = buffer.pointer;
1852         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1853                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1854                 status = -EFAULT;
1855                 goto out;
1856         }
1857
1858         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1859                           dod->package.count));
1860
1861         active_list = kcalloc(1 + dod->package.count,
1862                               sizeof(struct acpi_video_enumerated_device),
1863                               GFP_KERNEL);
1864         if (!active_list) {
1865                 status = -ENOMEM;
1866                 goto out;
1867         }
1868
1869         count = 0;
1870         for (i = 0; i < dod->package.count; i++) {
1871                 obj = &dod->package.elements[i];
1872
1873                 if (obj->type != ACPI_TYPE_INTEGER) {
1874                         printk(KERN_ERR PREFIX
1875                                 "Invalid _DOD data in element %d\n", i);
1876                         continue;
1877                 }
1878
1879                 active_list[count].value.int_val = obj->integer.value;
1880                 active_list[count].bind_info = NULL;
1881                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1882                                   (int)obj->integer.value));
1883                 count++;
1884         }
1885
1886         kfree(video->attached_array);
1887
1888         video->attached_array = active_list;
1889         video->attached_count = count;
1890
1891  out:
1892         kfree(buffer.pointer);
1893         return status;
1894 }
1895
1896 static int
1897 acpi_video_get_next_level(struct acpi_video_device *device,
1898                           u32 level_current, u32 event)
1899 {
1900         int min, max, min_above, max_below, i, l, delta = 255;
1901         max = max_below = 0;
1902         min = min_above = 255;
1903         /* Find closest level to level_current */
1904         for (i = 2; i < device->brightness->count; i++) {
1905                 l = device->brightness->levels[i];
1906                 if (abs(l - level_current) < abs(delta)) {
1907                         delta = l - level_current;
1908                         if (!delta)
1909                                 break;
1910                 }
1911         }
1912         /* Ajust level_current to closest available level */
1913         level_current += delta;
1914         for (i = 2; i < device->brightness->count; i++) {
1915                 l = device->brightness->levels[i];
1916                 if (l < min)
1917                         min = l;
1918                 if (l > max)
1919                         max = l;
1920                 if (l < min_above && l > level_current)
1921                         min_above = l;
1922                 if (l > max_below && l < level_current)
1923                         max_below = l;
1924         }
1925
1926         switch (event) {
1927         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1928                 return (level_current < max) ? min_above : min;
1929         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1930                 return (level_current < max) ? min_above : max;
1931         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1932                 return (level_current > min) ? max_below : min;
1933         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1934         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1935                 return 0;
1936         default:
1937                 return level_current;
1938         }
1939 }
1940
1941 static int
1942 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1943 {
1944         unsigned long long level_current, level_next;
1945         int result = -EINVAL;
1946
1947         if (!device->brightness)
1948                 goto out;
1949
1950         result = acpi_video_device_lcd_get_level_current(device,
1951                                                          &level_current);
1952         if (result)
1953                 goto out;
1954
1955         level_next = acpi_video_get_next_level(device, level_current, event);
1956
1957         result = acpi_video_device_lcd_set_level(device, level_next);
1958
1959 out:
1960         if (result)
1961                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1962
1963         return result;
1964 }
1965
1966 static int
1967 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1968                            struct acpi_device *device)
1969 {
1970         int status = 0;
1971         struct acpi_device *dev;
1972
1973         acpi_video_device_enumerate(video);
1974
1975         list_for_each_entry(dev, &device->children, node) {
1976
1977                 status = acpi_video_bus_get_one_device(dev, video);
1978                 if (ACPI_FAILURE(status)) {
1979                         printk(KERN_WARNING PREFIX
1980                                         "Cant attach device");
1981                         continue;
1982                 }
1983         }
1984         return status;
1985 }
1986
1987 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1988 {
1989         acpi_status status;
1990         struct acpi_video_bus *video;
1991
1992
1993         if (!device || !device->video)
1994                 return -ENOENT;
1995
1996         video = device->video;
1997
1998         acpi_video_device_remove_fs(device->dev);
1999
2000         status = acpi_remove_notify_handler(device->dev->handle,
2001                                             ACPI_DEVICE_NOTIFY,
2002                                             acpi_video_device_notify);
2003         sysfs_remove_link(&device->backlight->dev.kobj, "device");
2004         backlight_device_unregister(device->backlight);
2005         if (device->cdev) {
2006                 sysfs_remove_link(&device->dev->dev.kobj,
2007                                   "thermal_cooling");
2008                 sysfs_remove_link(&device->cdev->device.kobj,
2009                                   "device");
2010                 thermal_cooling_device_unregister(device->cdev);
2011                 device->cdev = NULL;
2012         }
2013         video_output_unregister(device->output_dev);
2014
2015         return 0;
2016 }
2017
2018 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2019 {
2020         int status;
2021         struct acpi_video_device *dev, *next;
2022
2023         mutex_lock(&video->device_list_lock);
2024
2025         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2026
2027                 status = acpi_video_bus_put_one_device(dev);
2028                 if (ACPI_FAILURE(status))
2029                         printk(KERN_WARNING PREFIX
2030                                "hhuuhhuu bug in acpi video driver.\n");
2031
2032                 if (dev->brightness) {
2033                         kfree(dev->brightness->levels);
2034                         kfree(dev->brightness);
2035                 }
2036                 list_del(&dev->entry);
2037                 kfree(dev);
2038         }
2039
2040         mutex_unlock(&video->device_list_lock);
2041
2042         return 0;
2043 }
2044
2045 /* acpi_video interface */
2046
2047 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2048 {
2049         return acpi_video_bus_DOS(video, 0, 0);
2050 }
2051
2052 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2053 {
2054         return acpi_video_bus_DOS(video, 0, 1);
2055 }
2056
2057 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2058 {
2059         struct acpi_video_bus *video = acpi_driver_data(device);
2060         struct input_dev *input;
2061         int keycode;
2062
2063         if (!video)
2064                 return;
2065
2066         input = video->input;
2067
2068         switch (event) {
2069         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2070                                          * most likely via hotkey. */
2071                 acpi_bus_generate_proc_event(device, event, 0);
2072                 keycode = KEY_SWITCHVIDEOMODE;
2073                 break;
2074
2075         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2076                                          * connector. */
2077                 acpi_video_device_enumerate(video);
2078                 acpi_video_device_rebind(video);
2079                 acpi_bus_generate_proc_event(device, event, 0);
2080                 keycode = KEY_SWITCHVIDEOMODE;
2081                 break;
2082
2083         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2084                 acpi_bus_generate_proc_event(device, event, 0);
2085                 keycode = KEY_SWITCHVIDEOMODE;
2086                 break;
2087         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2088                 acpi_bus_generate_proc_event(device, event, 0);
2089                 keycode = KEY_VIDEO_NEXT;
2090                 break;
2091         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2092                 acpi_bus_generate_proc_event(device, event, 0);
2093                 keycode = KEY_VIDEO_PREV;
2094                 break;
2095
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 void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2113 {
2114         struct acpi_video_device *video_device = data;
2115         struct acpi_device *device = NULL;
2116         struct acpi_video_bus *bus;
2117         struct input_dev *input;
2118         int keycode;
2119
2120         if (!video_device)
2121                 return;
2122
2123         device = video_device->dev;
2124         bus = video_device->video;
2125         input = bus->input;
2126
2127         switch (event) {
2128         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2129                 if (brightness_switch_enabled)
2130                         acpi_video_switch_brightness(video_device, event);
2131                 acpi_bus_generate_proc_event(device, event, 0);
2132                 keycode = KEY_BRIGHTNESS_CYCLE;
2133                 break;
2134         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2135                 if (brightness_switch_enabled)
2136                         acpi_video_switch_brightness(video_device, event);
2137                 acpi_bus_generate_proc_event(device, event, 0);
2138                 keycode = KEY_BRIGHTNESSUP;
2139                 break;
2140         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2141                 if (brightness_switch_enabled)
2142                         acpi_video_switch_brightness(video_device, event);
2143                 acpi_bus_generate_proc_event(device, event, 0);
2144                 keycode = KEY_BRIGHTNESSDOWN;
2145                 break;
2146         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2147                 if (brightness_switch_enabled)
2148                         acpi_video_switch_brightness(video_device, event);
2149                 acpi_bus_generate_proc_event(device, event, 0);
2150                 keycode = KEY_BRIGHTNESS_ZERO;
2151                 break;
2152         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2153                 if (brightness_switch_enabled)
2154                         acpi_video_switch_brightness(video_device, event);
2155                 acpi_bus_generate_proc_event(device, event, 0);
2156                 keycode = KEY_DISPLAY_OFF;
2157                 break;
2158         default:
2159                 keycode = KEY_UNKNOWN;
2160                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2161                                   "Unsupported event [0x%x]\n", event));
2162                 break;
2163         }
2164
2165         acpi_notifier_call_chain(device, event, 0);
2166         input_report_key(input, keycode, 1);
2167         input_sync(input);
2168         input_report_key(input, keycode, 0);
2169         input_sync(input);
2170
2171         return;
2172 }
2173
2174 static int instance;
2175 static int acpi_video_resume(struct acpi_device *device)
2176 {
2177         struct acpi_video_bus *video;
2178         struct acpi_video_device *video_device;
2179         int i;
2180
2181         if (!device || !acpi_driver_data(device))
2182                 return -EINVAL;
2183
2184         video = acpi_driver_data(device);
2185
2186         for (i = 0; i < video->attached_count; i++) {
2187                 video_device = video->attached_array[i].bind_info;
2188                 if (video_device && video_device->backlight)
2189                         acpi_video_set_brightness(video_device->backlight);
2190         }
2191         return AE_OK;
2192 }
2193
2194 static int acpi_video_bus_add(struct acpi_device *device)
2195 {
2196         struct acpi_video_bus *video;
2197         struct input_dev *input;
2198         int error;
2199
2200         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2201         if (!video)
2202                 return -ENOMEM;
2203
2204         /* a hack to fix the duplicate name "VID" problem on T61 */
2205         if (!strcmp(device->pnp.bus_id, "VID")) {
2206                 if (instance)
2207                         device->pnp.bus_id[3] = '0' + instance;
2208                 instance ++;
2209         }
2210         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2211         if (!strcmp(device->pnp.bus_id, "VGA")) {
2212                 if (instance)
2213                         device->pnp.bus_id[3] = '0' + instance;
2214                 instance++;
2215         }
2216
2217         video->device = device;
2218         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2219         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2220         device->driver_data = video;
2221
2222         acpi_video_bus_find_cap(video);
2223         error = acpi_video_bus_check(video);
2224         if (error)
2225                 goto err_free_video;
2226
2227         error = acpi_video_bus_add_fs(device);
2228         if (error)
2229                 goto err_free_video;
2230
2231         mutex_init(&video->device_list_lock);
2232         INIT_LIST_HEAD(&video->video_device_list);
2233
2234         acpi_video_bus_get_devices(video, device);
2235         acpi_video_bus_start_devices(video);
2236
2237         video->input = input = input_allocate_device();
2238         if (!input) {
2239                 error = -ENOMEM;
2240                 goto err_stop_video;
2241         }
2242
2243         snprintf(video->phys, sizeof(video->phys),
2244                 "%s/video/input0", acpi_device_hid(video->device));
2245
2246         input->name = acpi_device_name(video->device);
2247         input->phys = video->phys;
2248         input->id.bustype = BUS_HOST;
2249         input->id.product = 0x06;
2250         input->dev.parent = &device->dev;
2251         input->evbit[0] = BIT(EV_KEY);
2252         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2253         set_bit(KEY_VIDEO_NEXT, input->keybit);
2254         set_bit(KEY_VIDEO_PREV, input->keybit);
2255         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2256         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2257         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2258         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2259         set_bit(KEY_DISPLAY_OFF, input->keybit);
2260         set_bit(KEY_UNKNOWN, input->keybit);
2261
2262         error = input_register_device(input);
2263         if (error)
2264                 goto err_free_input_dev;
2265
2266         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2267                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2268                video->flags.multihead ? "yes" : "no",
2269                video->flags.rom ? "yes" : "no",
2270                video->flags.post ? "yes" : "no");
2271
2272         return 0;
2273
2274  err_free_input_dev:
2275         input_free_device(input);
2276  err_stop_video:
2277         acpi_video_bus_stop_devices(video);
2278         acpi_video_bus_put_devices(video);
2279         kfree(video->attached_array);
2280         acpi_video_bus_remove_fs(device);
2281  err_free_video:
2282         kfree(video);
2283         device->driver_data = NULL;
2284
2285         return error;
2286 }
2287
2288 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2289 {
2290         struct acpi_video_bus *video = NULL;
2291
2292
2293         if (!device || !acpi_driver_data(device))
2294                 return -EINVAL;
2295
2296         video = acpi_driver_data(device);
2297
2298         acpi_video_bus_stop_devices(video);
2299         acpi_video_bus_put_devices(video);
2300         acpi_video_bus_remove_fs(device);
2301
2302         input_unregister_device(video->input);
2303         kfree(video->attached_array);
2304         kfree(video);
2305
2306         return 0;
2307 }
2308
2309 static int __init intel_opregion_present(void)
2310 {
2311 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2312         struct pci_dev *dev = NULL;
2313         u32 address;
2314
2315         for_each_pci_dev(dev) {
2316                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2317                         continue;
2318                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2319                         continue;
2320                 pci_read_config_dword(dev, 0xfc, &address);
2321                 if (!address)
2322                         continue;
2323                 return 1;
2324         }
2325 #endif
2326         return 0;
2327 }
2328
2329 int acpi_video_register(void)
2330 {
2331         int result = 0;
2332         if (register_count) {
2333                 /*
2334                  * if the function of acpi_video_register is already called,
2335                  * don't register the acpi_vide_bus again and return no error.
2336                  */
2337                 return 0;
2338         }
2339
2340         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2341         if (!acpi_video_dir)
2342                 return -ENODEV;
2343
2344         result = acpi_bus_register_driver(&acpi_video_bus);
2345         if (result < 0) {
2346                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2347                 return -ENODEV;
2348         }
2349
2350         /*
2351          * When the acpi_video_bus is loaded successfully, increase
2352          * the counter reference.
2353          */
2354         register_count = 1;
2355
2356         return 0;
2357 }
2358 EXPORT_SYMBOL(acpi_video_register);
2359
2360 void acpi_video_unregister(void)
2361 {
2362         if (!register_count) {
2363                 /*
2364                  * If the acpi video bus is already unloaded, don't
2365                  * unload it again and return directly.
2366                  */
2367                 return;
2368         }
2369         acpi_bus_unregister_driver(&acpi_video_bus);
2370
2371         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2372
2373         register_count = 0;
2374
2375         return;
2376 }
2377 EXPORT_SYMBOL(acpi_video_unregister);
2378
2379 /*
2380  * This is kind of nasty. Hardware using Intel chipsets may require
2381  * the video opregion code to be run first in order to initialise
2382  * state before any ACPI video calls are made. To handle this we defer
2383  * registration of the video class until the opregion code has run.
2384  */
2385
2386 static int __init acpi_video_init(void)
2387 {
2388         dmi_check_system(video_dmi_table);
2389
2390         if (intel_opregion_present())
2391                 return 0;
2392
2393         return acpi_video_register();
2394 }
2395
2396 static void __exit acpi_video_exit(void)
2397 {
2398         acpi_video_unregister();
2399
2400         return;
2401 }
2402
2403 module_init(acpi_video_init);
2404 module_exit(acpi_video_exit);