drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/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_old = 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                 goto set_level;
 905
 906         if (br->flags._BCL_reversed)
 907                 level_old = (br->count - 1) - level_old;
 908         level_old = br->levels[level_old];
 909
 910 set_level:
 911         result = acpi_video_device_lcd_set_level(device, level_old);
 912         if (result)
 913                 goto out_free_levels;
 914
 915         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 916                           "found %d brightness levels\n", count - 2));
 917         kfree(obj);
 918         return result;
 919
 920 out_free_levels:
 921         kfree(br->levels);
 922 out_free:
 923         kfree(br);
 924 out:
 925         device->brightness = NULL;
 926         kfree(obj);
 927         return result;
 928 }
 929
 930 /*
 931  *  Arg:
 932  *      device  : video output device (LCD, CRT, ..)
 933  *
 934  *  Return Value:
 935  *      None
 936  *
 937  *  Find out all required AML methods defined under the output
 938  *  device.
 939  */
 940
 941 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 942 {
 943         acpi_handle h_dummy1;
 944
 945         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 946                 device->cap._ADR = 1;
 947         }
 948         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 949                 device->cap._BCL = 1;
 950         }
 951         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 952                 device->cap._BCM = 1;
 953         }
 954         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 955                 device->cap._BQC = 1;
 956         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 957                                 &h_dummy1))) {
 958                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 959                 device->cap._BCQ = 1;
 960         }
 961
 962         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 963                 device->cap._DDC = 1;
 964         }
 965         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 966                 device->cap._DCS = 1;
 967         }
 968         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 969                 device->cap._DGS = 1;
 970         }
 971         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 972                 device->cap._DSS = 1;
 973         }
 974
 975         if (acpi_video_backlight_support()) {
 976                 int result;
 977                 static int count = 0;
 978                 char *name;
 979
 980                 result = acpi_video_init_brightness(device);
 981                 if (result)
 982                         return;
 983                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 984                 if (!name)
 985                         return;
 986
 987                 sprintf(name, "acpi_video%d", count++);
 988                 device->backlight = backlight_device_register(name,
 989                         NULL, device, &acpi_backlight_ops);
 990                 device->backlight->props.max_brightness = device->brightness->count-3;
 991                 kfree(name);
 992
 993                 result = sysfs_create_link(&device->backlight->dev.kobj,
 994                                            &device->dev->dev.kobj, "device");
 995                 if (result)
 996                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 997
 998                 device->cooling_dev = thermal_cooling_device_register("LCD",
 999                                         device->dev, &video_cooling_ops);
1000                 if (IS_ERR(device->cooling_dev)) {
1001                         /*
1002                          * Set cooling_dev to NULL so we don't crash trying to
1003                          * free it.
1004                          * Also, why the hell we are returning early and
1005                          * not attempt to register video output if cooling
1006                          * device registration failed?
1007                          * -- dtor
1008                          */
1009                         device->cooling_dev = NULL;
1010                         return;
1011                 }
1012
1013                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1014                          device->cooling_dev->id);
1015                 result = sysfs_create_link(&device->dev->dev.kobj,
1016                                 &device->cooling_dev->device.kobj,
1017                                 "thermal_cooling");
1018                 if (result)
1019                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1020                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1021                                 &device->dev->dev.kobj, "device");
1022                 if (result)
1023                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1024
1025         }
1026
1027         if (acpi_video_display_switch_support()) {
1028
1029                 if (device->cap._DCS && device->cap._DSS) {
1030                         static int count;
1031                         char *name;
1032                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1033                         if (!name)
1034                                 return;
1035                         sprintf(name, "acpi_video%d", count++);
1036                         device->output_dev = video_output_register(name,
1037                                         NULL, device, &acpi_output_properties);
1038                         kfree(name);
1039                 }
1040         }
1041 }
1042
1043 /*
1044  *  Arg:
1045  *      device  : video output device (VGA)
1046  *
1047  *  Return Value:
1048  *      None
1049  *
1050  *  Find out all required AML methods defined under the video bus device.
1051  */
1052
1053 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1054 {
1055         acpi_handle h_dummy1;
1056
1057         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1058                 video->cap._DOS = 1;
1059         }
1060         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1061                 video->cap._DOD = 1;
1062         }
1063         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1064                 video->cap._ROM = 1;
1065         }
1066         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1067                 video->cap._GPD = 1;
1068         }
1069         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1070                 video->cap._SPD = 1;
1071         }
1072         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1073                 video->cap._VPO = 1;
1074         }
1075 }
1076
1077 /*
1078  * Check whether the video bus device has required AML method to
1079  * support the desired features
1080  */
1081
1082 static int acpi_video_bus_check(struct acpi_video_bus *video)
1083 {
1084         acpi_status status = -ENOENT;
1085         struct pci_dev *dev;
1086
1087         if (!video)
1088                 return -EINVAL;
1089
1090         dev = acpi_get_pci_dev(video->device->handle);
1091         if (!dev)
1092                 return -ENODEV;
1093         pci_dev_put(dev);
1094
1095         /* Since there is no HID, CID and so on for VGA driver, we have
1096          * to check well known required nodes.
1097          */
1098
1099         /* Does this device support video switching? */
1100         if (video->cap._DOS) {
1101                 video->flags.multihead = 1;
1102                 status = 0;
1103         }
1104
1105         /* Does this device support retrieving a video ROM? */
1106         if (video->cap._ROM) {
1107                 video->flags.rom = 1;
1108                 status = 0;
1109         }
1110
1111         /* Does this device support configuring which video device to POST? */
1112         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1113                 video->flags.post = 1;
1114                 status = 0;
1115         }
1116
1117         return status;
1118 }
1119
1120 /* --------------------------------------------------------------------------
1121                               FS Interface (/proc)
1122    -------------------------------------------------------------------------- */
1123
1124 static struct proc_dir_entry *acpi_video_dir;
1125
1126 /* video devices */
1127
1128 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1129 {
1130         struct acpi_video_device *dev = seq->private;
1131
1132
1133         if (!dev)
1134                 goto end;
1135
1136         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1137         seq_printf(seq, "type:         ");
1138         if (dev->flags.crt)
1139                 seq_printf(seq, "CRT\n");
1140         else if (dev->flags.lcd)
1141                 seq_printf(seq, "LCD\n");
1142         else if (dev->flags.tvout)
1143                 seq_printf(seq, "TVOUT\n");
1144         else if (dev->flags.dvi)
1145                 seq_printf(seq, "DVI\n");
1146         else
1147                 seq_printf(seq, "UNKNOWN\n");
1148
1149         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1150
1151       end:
1152         return 0;
1153 }
1154
1155 static int
1156 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1157 {
1158         return single_open(file, acpi_video_device_info_seq_show,
1159                            PDE(inode)->data);
1160 }
1161
1162 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1163 {
1164         int status;
1165         struct acpi_video_device *dev = seq->private;
1166         unsigned long long state;
1167
1168
1169         if (!dev)
1170                 goto end;
1171
1172         status = acpi_video_device_get_state(dev, &state);
1173         seq_printf(seq, "state:     ");
1174         if (ACPI_SUCCESS(status))
1175                 seq_printf(seq, "0x%02llx\n", state);
1176         else
1177                 seq_printf(seq, "<not supported>\n");
1178
1179         status = acpi_video_device_query(dev, &state);
1180         seq_printf(seq, "query:     ");
1181         if (ACPI_SUCCESS(status))
1182                 seq_printf(seq, "0x%02llx\n", state);
1183         else
1184                 seq_printf(seq, "<not supported>\n");
1185
1186       end:
1187         return 0;
1188 }
1189
1190 static int
1191 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1192 {
1193         return single_open(file, acpi_video_device_state_seq_show,
1194                            PDE(inode)->data);
1195 }
1196
1197 static ssize_t
1198 acpi_video_device_write_state(struct file *file,
1199                               const char __user * buffer,
1200                               size_t count, loff_t * data)
1201 {
1202         int status;
1203         struct seq_file *m = file->private_data;
1204         struct acpi_video_device *dev = m->private;
1205         char str[12] = { 0 };
1206         u32 state = 0;
1207
1208
1209         if (!dev || count + 1 > sizeof str)
1210                 return -EINVAL;
1211
1212         if (copy_from_user(str, buffer, count))
1213                 return -EFAULT;
1214
1215         str[count] = 0;
1216         state = simple_strtoul(str, NULL, 0);
1217         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1218
1219         status = acpi_video_device_set_state(dev, state);
1220
1221         if (status)
1222                 return -EFAULT;
1223
1224         return count;
1225 }
1226
1227 static int
1228 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1229 {
1230         struct acpi_video_device *dev = seq->private;
1231         int i;
1232
1233
1234         if (!dev || !dev->brightness) {
1235                 seq_printf(seq, "<not supported>\n");
1236                 return 0;
1237         }
1238
1239         seq_printf(seq, "levels: ");
1240         for (i = 2; i < dev->brightness->count; i++)
1241                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1242         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1243
1244         return 0;
1245 }
1246
1247 static int
1248 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1249 {
1250         return single_open(file, acpi_video_device_brightness_seq_show,
1251                            PDE(inode)->data);
1252 }
1253
1254 static ssize_t
1255 acpi_video_device_write_brightness(struct file *file,
1256                                    const char __user * buffer,
1257                                    size_t count, loff_t * data)
1258 {
1259         struct seq_file *m = file->private_data;
1260         struct acpi_video_device *dev = m->private;
1261         char str[5] = { 0 };
1262         unsigned int level = 0;
1263         int i;
1264
1265
1266         if (!dev || !dev->brightness || count + 1 > sizeof str)
1267                 return -EINVAL;
1268
1269         if (copy_from_user(str, buffer, count))
1270                 return -EFAULT;
1271
1272         str[count] = 0;
1273         level = simple_strtoul(str, NULL, 0);
1274
1275         if (level > 100)
1276                 return -EFAULT;
1277
1278         /* validate through the list of available levels */
1279         for (i = 2; i < dev->brightness->count; i++)
1280                 if (level == dev->brightness->levels[i]) {
1281                         if (!acpi_video_device_lcd_set_level(dev, level))
1282                                 return count;
1283                         break;
1284                 }
1285
1286         return -EINVAL;
1287 }
1288
1289 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1290 {
1291         struct acpi_video_device *dev = seq->private;
1292         int status;
1293         int i;
1294         union acpi_object *edid = NULL;
1295
1296
1297         if (!dev)
1298                 goto out;
1299
1300         status = acpi_video_device_EDID(dev, &edid, 128);
1301         if (ACPI_FAILURE(status)) {
1302                 status = acpi_video_device_EDID(dev, &edid, 256);
1303         }
1304
1305         if (ACPI_FAILURE(status)) {
1306                 goto out;
1307         }
1308
1309         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1310                 for (i = 0; i < edid->buffer.length; i++)
1311                         seq_putc(seq, edid->buffer.pointer[i]);
1312         }
1313
1314       out:
1315         if (!edid)
1316                 seq_printf(seq, "<not supported>\n");
1317         else
1318                 kfree(edid);
1319
1320         return 0;
1321 }
1322
1323 static int
1324 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1325 {
1326         return single_open(file, acpi_video_device_EDID_seq_show,
1327                            PDE(inode)->data);
1328 }
1329
1330 static int acpi_video_device_add_fs(struct acpi_device *device)
1331 {
1332         struct proc_dir_entry *entry, *device_dir;
1333         struct acpi_video_device *vid_dev;
1334
1335         vid_dev = acpi_driver_data(device);
1336         if (!vid_dev)
1337                 return -ENODEV;
1338
1339         device_dir = proc_mkdir(acpi_device_bid(device),
1340                                 vid_dev->video->dir);
1341         if (!device_dir)
1342                 return -ENOMEM;
1343
1344         /* 'info' [R] */
1345         entry = proc_create_data("info", S_IRUGO, device_dir,
1346                         &acpi_video_device_info_fops, acpi_driver_data(device));
1347         if (!entry)
1348                 goto err_remove_dir;
1349
1350         /* 'state' [R/W] */
1351         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1352                                  device_dir,
1353                                  &acpi_video_device_state_fops,
1354                                  acpi_driver_data(device));
1355         if (!entry)
1356                 goto err_remove_info;
1357
1358         /* 'brightness' [R/W] */
1359         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1360                                  device_dir,
1361                                  &acpi_video_device_brightness_fops,
1362                                  acpi_driver_data(device));
1363         if (!entry)
1364                 goto err_remove_state;
1365
1366         /* 'EDID' [R] */
1367         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1368                                  &acpi_video_device_EDID_fops,
1369                                  acpi_driver_data(device));
1370         if (!entry)
1371                 goto err_remove_brightness;
1372
1373         acpi_device_dir(device) = device_dir;
1374
1375         return 0;
1376
1377  err_remove_brightness:
1378         remove_proc_entry("brightness", device_dir);
1379  err_remove_state:
1380         remove_proc_entry("state", device_dir);
1381  err_remove_info:
1382         remove_proc_entry("info", device_dir);
1383  err_remove_dir:
1384         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1385         return -ENOMEM;
1386 }
1387
1388 static int acpi_video_device_remove_fs(struct acpi_device *device)
1389 {
1390         struct acpi_video_device *vid_dev;
1391         struct proc_dir_entry *device_dir;
1392
1393         vid_dev = acpi_driver_data(device);
1394         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1395                 return -ENODEV;
1396
1397         device_dir = acpi_device_dir(device);
1398         if (device_dir) {
1399                 remove_proc_entry("info", device_dir);
1400                 remove_proc_entry("state", device_dir);
1401                 remove_proc_entry("brightness", device_dir);
1402                 remove_proc_entry("EDID", device_dir);
1403                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1404                 acpi_device_dir(device) = NULL;
1405         }
1406
1407         return 0;
1408 }
1409
1410 /* video bus */
1411 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1412 {
1413         struct acpi_video_bus *video = seq->private;
1414
1415
1416         if (!video)
1417                 goto end;
1418
1419         seq_printf(seq, "Switching heads:              %s\n",
1420                    video->flags.multihead ? "yes" : "no");
1421         seq_printf(seq, "Video ROM:                    %s\n",
1422                    video->flags.rom ? "yes" : "no");
1423         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1424                    video->flags.post ? "yes" : "no");
1425
1426       end:
1427         return 0;
1428 }
1429
1430 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1431 {
1432         return single_open(file, acpi_video_bus_info_seq_show,
1433                            PDE(inode)->data);
1434 }
1435
1436 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1437 {
1438         struct acpi_video_bus *video = seq->private;
1439
1440
1441         if (!video)
1442                 goto end;
1443
1444         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1445         seq_printf(seq, "<TODO>\n");
1446
1447       end:
1448         return 0;
1449 }
1450
1451 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1452 {
1453         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1454 }
1455
1456 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1457 {
1458         struct acpi_video_bus *video = seq->private;
1459         unsigned long long options;
1460         int status;
1461
1462
1463         if (!video)
1464                 goto end;
1465
1466         status = acpi_video_bus_POST_options(video, &options);
1467         if (ACPI_SUCCESS(status)) {
1468                 if (!(options & 1)) {
1469                         printk(KERN_WARNING PREFIX
1470                                "The motherboard VGA device is not listed as a possible POST device.\n");
1471                         printk(KERN_WARNING PREFIX
1472                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1473                 }
1474                 printk(KERN_WARNING "%llx\n", options);
1475                 seq_printf(seq, "can POST: <integrated video>");
1476                 if (options & 2)
1477                         seq_printf(seq, " <PCI video>");
1478                 if (options & 4)
1479                         seq_printf(seq, " <AGP video>");
1480                 seq_putc(seq, '\n');
1481         } else
1482                 seq_printf(seq, "<not supported>\n");
1483       end:
1484         return 0;
1485 }
1486
1487 static int
1488 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1489 {
1490         return single_open(file, acpi_video_bus_POST_info_seq_show,
1491                            PDE(inode)->data);
1492 }
1493
1494 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1495 {
1496         struct acpi_video_bus *video = seq->private;
1497         int status;
1498         unsigned long long id;
1499
1500
1501         if (!video)
1502                 goto end;
1503
1504         status = acpi_video_bus_get_POST(video, &id);
1505         if (!ACPI_SUCCESS(status)) {
1506                 seq_printf(seq, "<not supported>\n");
1507                 goto end;
1508         }
1509         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1510
1511       end:
1512         return 0;
1513 }
1514
1515 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1516 {
1517         struct acpi_video_bus *video = seq->private;
1518
1519
1520         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1521
1522         return 0;
1523 }
1524
1525 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1526 {
1527         return single_open(file, acpi_video_bus_POST_seq_show,
1528                            PDE(inode)->data);
1529 }
1530
1531 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1532 {
1533         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1534 }
1535
1536 static ssize_t
1537 acpi_video_bus_write_POST(struct file *file,
1538                           const char __user * buffer,
1539                           size_t count, loff_t * data)
1540 {
1541         int status;
1542         struct seq_file *m = file->private_data;
1543         struct acpi_video_bus *video = m->private;
1544         char str[12] = { 0 };
1545         unsigned long long opt, options;
1546
1547
1548         if (!video || count + 1 > sizeof str)
1549                 return -EINVAL;
1550
1551         status = acpi_video_bus_POST_options(video, &options);
1552         if (!ACPI_SUCCESS(status))
1553                 return -EINVAL;
1554
1555         if (copy_from_user(str, buffer, count))
1556                 return -EFAULT;
1557
1558         str[count] = 0;
1559         opt = strtoul(str, NULL, 0);
1560         if (opt > 3)
1561                 return -EFAULT;
1562
1563         /* just in case an OEM 'forgot' the motherboard... */
1564         options |= 1;
1565
1566         if (options & (1ul << opt)) {
1567                 status = acpi_video_bus_set_POST(video, opt);
1568                 if (!ACPI_SUCCESS(status))
1569                         return -EFAULT;
1570
1571         }
1572
1573         return count;
1574 }
1575
1576 static ssize_t
1577 acpi_video_bus_write_DOS(struct file *file,
1578                          const char __user * buffer,
1579                          size_t count, loff_t * data)
1580 {
1581         int status;
1582         struct seq_file *m = file->private_data;
1583         struct acpi_video_bus *video = m->private;
1584         char str[12] = { 0 };
1585         unsigned long opt;
1586
1587
1588         if (!video || count + 1 > sizeof str)
1589                 return -EINVAL;
1590
1591         if (copy_from_user(str, buffer, count))
1592                 return -EFAULT;
1593
1594         str[count] = 0;
1595         opt = strtoul(str, NULL, 0);
1596         if (opt > 7)
1597                 return -EFAULT;
1598
1599         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1600
1601         if (!ACPI_SUCCESS(status))
1602                 return -EFAULT;
1603
1604         return count;
1605 }
1606
1607 static int acpi_video_bus_add_fs(struct acpi_device *device)
1608 {
1609         struct acpi_video_bus *video = acpi_driver_data(device);
1610         struct proc_dir_entry *device_dir;
1611         struct proc_dir_entry *entry;
1612
1613         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1614         if (!device_dir)
1615                 return -ENOMEM;
1616
1617         /* 'info' [R] */
1618         entry = proc_create_data("info", S_IRUGO, device_dir,
1619                                  &acpi_video_bus_info_fops,
1620                                  acpi_driver_data(device));
1621         if (!entry)
1622                 goto err_remove_dir;
1623
1624         /* 'ROM' [R] */
1625         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1626                                  &acpi_video_bus_ROM_fops,
1627                                  acpi_driver_data(device));
1628         if (!entry)
1629                 goto err_remove_info;
1630
1631         /* 'POST_info' [R] */
1632         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1633                                  &acpi_video_bus_POST_info_fops,
1634                                  acpi_driver_data(device));
1635         if (!entry)
1636                 goto err_remove_rom;
1637
1638         /* 'POST' [R/W] */
1639         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1640                                  device_dir,
1641                                  &acpi_video_bus_POST_fops,
1642                                  acpi_driver_data(device));
1643         if (!entry)
1644                 goto err_remove_post_info;
1645
1646         /* 'DOS' [R/W] */
1647         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1648                                  device_dir,
1649                                  &acpi_video_bus_DOS_fops,
1650                                  acpi_driver_data(device));
1651         if (!entry)
1652                 goto err_remove_post;
1653
1654         video->dir = acpi_device_dir(device) = device_dir;
1655         return 0;
1656
1657  err_remove_post:
1658         remove_proc_entry("POST", device_dir);
1659  err_remove_post_info:
1660         remove_proc_entry("POST_info", device_dir);
1661  err_remove_rom:
1662         remove_proc_entry("ROM", device_dir);
1663  err_remove_info:
1664         remove_proc_entry("info", device_dir);
1665  err_remove_dir:
1666         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1667         return -ENOMEM;
1668 }
1669
1670 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1671 {
1672         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1673
1674         if (device_dir) {
1675                 remove_proc_entry("info", device_dir);
1676                 remove_proc_entry("ROM", device_dir);
1677                 remove_proc_entry("POST_info", device_dir);
1678                 remove_proc_entry("POST", device_dir);
1679                 remove_proc_entry("DOS", device_dir);
1680                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1681                 acpi_device_dir(device) = NULL;
1682         }
1683
1684         return 0;
1685 }
1686
1687 /* --------------------------------------------------------------------------
1688                                  Driver Interface
1689    -------------------------------------------------------------------------- */
1690
1691 /* device interface */
1692 static struct acpi_video_device_attrib*
1693 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1694 {
1695         struct acpi_video_enumerated_device *ids;
1696         int i;
1697
1698         for (i = 0; i < video->attached_count; i++) {
1699                 ids = &video->attached_array[i];
1700                 if ((ids->value.int_val & 0xffff) == device_id)
1701                         return &ids->value.attrib;
1702         }
1703
1704         return NULL;
1705 }
1706
1707 static int
1708 acpi_video_bus_get_one_device(struct acpi_device *device,
1709                               struct acpi_video_bus *video)
1710 {
1711         unsigned long long device_id;
1712         int status;
1713         struct acpi_video_device *data;
1714         struct acpi_video_device_attrib* attribute;
1715
1716         if (!device || !video)
1717                 return -EINVAL;
1718
1719         status =
1720             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1721         if (ACPI_SUCCESS(status)) {
1722
1723                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1724                 if (!data)
1725                         return -ENOMEM;
1726
1727                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1728                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1729                 device->driver_data = data;
1730
1731                 data->device_id = device_id;
1732                 data->video = video;
1733                 data->dev = device;
1734
1735                 attribute = acpi_video_get_device_attr(video, device_id);
1736
1737                 if((attribute != NULL) && attribute->device_id_scheme) {
1738                         switch (attribute->display_type) {
1739                         case ACPI_VIDEO_DISPLAY_CRT:
1740                                 data->flags.crt = 1;
1741                                 break;
1742                         case ACPI_VIDEO_DISPLAY_TV:
1743                                 data->flags.tvout = 1;
1744                                 break;
1745                         case ACPI_VIDEO_DISPLAY_DVI:
1746                                 data->flags.dvi = 1;
1747                                 break;
1748                         case ACPI_VIDEO_DISPLAY_LCD:
1749                                 data->flags.lcd = 1;
1750                                 break;
1751                         default:
1752                                 data->flags.unknown = 1;
1753                                 break;
1754                         }
1755                         if(attribute->bios_can_detect)
1756                                 data->flags.bios = 1;
1757                 } else
1758                         data->flags.unknown = 1;
1759
1760                 acpi_video_device_bind(video, data);
1761                 acpi_video_device_find_cap(data);
1762
1763                 status = acpi_install_notify_handler(device->handle,
1764                                                      ACPI_DEVICE_NOTIFY,
1765                                                      acpi_video_device_notify,
1766                                                      data);
1767                 if (ACPI_FAILURE(status)) {
1768                         printk(KERN_ERR PREFIX
1769                                           "Error installing notify handler\n");
1770                         if(data->brightness)
1771                                 kfree(data->brightness->levels);
1772                         kfree(data->brightness);
1773                         kfree(data);
1774                         return -ENODEV;
1775                 }
1776
1777                 mutex_lock(&video->device_list_lock);
1778                 list_add_tail(&data->entry, &video->video_device_list);
1779                 mutex_unlock(&video->device_list_lock);
1780
1781                 acpi_video_device_add_fs(device);
1782
1783                 return 0;
1784         }
1785
1786         return -ENOENT;
1787 }
1788
1789 /*
1790  *  Arg:
1791  *      video   : video bus device
1792  *
1793  *  Return:
1794  *      none
1795  *
1796  *  Enumerate the video device list of the video bus,
1797  *  bind the ids with the corresponding video devices
1798  *  under the video bus.
1799  */
1800
1801 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1802 {
1803         struct acpi_video_device *dev;
1804
1805         mutex_lock(&video->device_list_lock);
1806
1807         list_for_each_entry(dev, &video->video_device_list, entry)
1808                 acpi_video_device_bind(video, dev);
1809
1810         mutex_unlock(&video->device_list_lock);
1811 }
1812
1813 /*
1814  *  Arg:
1815  *      video   : video bus device
1816  *      device  : video output device under the video
1817  *              bus
1818  *
1819  *  Return:
1820  *      none
1821  *
1822  *  Bind the ids with the corresponding video devices
1823  *  under the video bus.
1824  */
1825
1826 static void
1827 acpi_video_device_bind(struct acpi_video_bus *video,
1828                        struct acpi_video_device *device)
1829 {
1830         struct acpi_video_enumerated_device *ids;
1831         int i;
1832
1833         for (i = 0; i < video->attached_count; i++) {
1834                 ids = &video->attached_array[i];
1835                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1836                         ids->bind_info = device;
1837                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1838                 }
1839         }
1840 }
1841
1842 /*
1843  *  Arg:
1844  *      video   : video bus device
1845  *
1846  *  Return:
1847  *      < 0     : error
1848  *
1849  *  Call _DOD to enumerate all devices attached to display adapter
1850  *
1851  */
1852
1853 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1854 {
1855         int status;
1856         int count;
1857         int i;
1858         struct acpi_video_enumerated_device *active_list;
1859         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1860         union acpi_object *dod = NULL;
1861         union acpi_object *obj;
1862
1863         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1864         if (!ACPI_SUCCESS(status)) {
1865                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1866                 return status;
1867         }
1868
1869         dod = buffer.pointer;
1870         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1871                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1872                 status = -EFAULT;
1873                 goto out;
1874         }
1875
1876         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1877                           dod->package.count));
1878
1879         active_list = kcalloc(1 + dod->package.count,
1880                               sizeof(struct acpi_video_enumerated_device),
1881                               GFP_KERNEL);
1882         if (!active_list) {
1883                 status = -ENOMEM;
1884                 goto out;
1885         }
1886
1887         count = 0;
1888         for (i = 0; i < dod->package.count; i++) {
1889                 obj = &dod->package.elements[i];
1890
1891                 if (obj->type != ACPI_TYPE_INTEGER) {
1892                         printk(KERN_ERR PREFIX
1893                                 "Invalid _DOD data in element %d\n", i);
1894                         continue;
1895                 }
1896
1897                 active_list[count].value.int_val = obj->integer.value;
1898                 active_list[count].bind_info = NULL;
1899                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1900                                   (int)obj->integer.value));
1901                 count++;
1902         }
1903
1904         kfree(video->attached_array);
1905
1906         video->attached_array = active_list;
1907         video->attached_count = count;
1908
1909  out:
1910         kfree(buffer.pointer);
1911         return status;
1912 }
1913
1914 static int
1915 acpi_video_get_next_level(struct acpi_video_device *device,
1916                           u32 level_current, u32 event)
1917 {
1918         int min, max, min_above, max_below, i, l, delta = 255;
1919         max = max_below = 0;
1920         min = min_above = 255;
1921         /* Find closest level to level_current */
1922         for (i = 2; i < device->brightness->count; i++) {
1923                 l = device->brightness->levels[i];
1924                 if (abs(l - level_current) < abs(delta)) {
1925                         delta = l - level_current;
1926                         if (!delta)
1927                                 break;
1928                 }
1929         }
1930         /* Ajust level_current to closest available level */
1931         level_current += delta;
1932         for (i = 2; i < device->brightness->count; i++) {
1933                 l = device->brightness->levels[i];
1934                 if (l < min)
1935                         min = l;
1936                 if (l > max)
1937                         max = l;
1938                 if (l < min_above && l > level_current)
1939                         min_above = l;
1940                 if (l > max_below && l < level_current)
1941                         max_below = l;
1942         }
1943
1944         switch (event) {
1945         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1946                 return (level_current < max) ? min_above : min;
1947         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1948                 return (level_current < max) ? min_above : max;
1949         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1950                 return (level_current > min) ? max_below : min;
1951         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1952         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1953                 return 0;
1954         default:
1955                 return level_current;
1956         }
1957 }
1958
1959 static int
1960 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1961 {
1962         unsigned long long level_current, level_next;
1963         int result = -EINVAL;
1964
1965         if (!device->brightness)
1966                 goto out;
1967
1968         result = acpi_video_device_lcd_get_level_current(device,
1969                                                          &level_current);
1970         if (result)
1971                 goto out;
1972
1973         level_next = acpi_video_get_next_level(device, level_current, event);
1974
1975         result = acpi_video_device_lcd_set_level(device, level_next);
1976
1977 out:
1978         if (result)
1979                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1980
1981         return result;
1982 }
1983
1984 static int
1985 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1986                            struct acpi_device *device)
1987 {
1988         int status = 0;
1989         struct acpi_device *dev;
1990
1991         acpi_video_device_enumerate(video);
1992
1993         list_for_each_entry(dev, &device->children, node) {
1994
1995                 status = acpi_video_bus_get_one_device(dev, video);
1996                 if (ACPI_FAILURE(status)) {
1997                         printk(KERN_WARNING PREFIX
1998                                         "Cant attach device");
1999                         continue;
2000                 }
2001         }
2002         return status;
2003 }
2004
2005 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2006 {
2007         acpi_status status;
2008         struct acpi_video_bus *video;
2009
2010
2011         if (!device || !device->video)
2012                 return -ENOENT;
2013
2014         video = device->video;
2015
2016         acpi_video_device_remove_fs(device->dev);
2017
2018         status = acpi_remove_notify_handler(device->dev->handle,
2019                                             ACPI_DEVICE_NOTIFY,
2020                                             acpi_video_device_notify);
2021         sysfs_remove_link(&device->backlight->dev.kobj, "device");
2022         backlight_device_unregister(device->backlight);
2023         if (device->cooling_dev) {
2024                 sysfs_remove_link(&device->dev->dev.kobj,
2025                                   "thermal_cooling");
2026                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2027                                   "device");
2028                 thermal_cooling_device_unregister(device->cooling_dev);
2029                 device->cooling_dev = NULL;
2030         }
2031         video_output_unregister(device->output_dev);
2032
2033         return 0;
2034 }
2035
2036 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2037 {
2038         int status;
2039         struct acpi_video_device *dev, *next;
2040
2041         mutex_lock(&video->device_list_lock);
2042
2043         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2044
2045                 status = acpi_video_bus_put_one_device(dev);
2046                 if (ACPI_FAILURE(status))
2047                         printk(KERN_WARNING PREFIX
2048                                "hhuuhhuu bug in acpi video driver.\n");
2049
2050                 if (dev->brightness) {
2051                         kfree(dev->brightness->levels);
2052                         kfree(dev->brightness);
2053                 }
2054                 list_del(&dev->entry);
2055                 kfree(dev);
2056         }
2057
2058         mutex_unlock(&video->device_list_lock);
2059
2060         return 0;
2061 }
2062
2063 /* acpi_video interface */
2064
2065 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2066 {
2067         return acpi_video_bus_DOS(video, 0, 0);
2068 }
2069
2070 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2071 {
2072         return acpi_video_bus_DOS(video, 0, 1);
2073 }
2074
2075 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2076 {
2077         struct acpi_video_bus *video = acpi_driver_data(device);
2078         struct input_dev *input;
2079         int keycode;
2080
2081         if (!video)
2082                 return;
2083
2084         input = video->input;
2085
2086         switch (event) {
2087         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2088                                          * most likely via hotkey. */
2089                 acpi_bus_generate_proc_event(device, event, 0);
2090                 keycode = KEY_SWITCHVIDEOMODE;
2091                 break;
2092
2093         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2094                                          * connector. */
2095                 acpi_video_device_enumerate(video);
2096                 acpi_video_device_rebind(video);
2097                 acpi_bus_generate_proc_event(device, event, 0);
2098                 keycode = KEY_SWITCHVIDEOMODE;
2099                 break;
2100
2101         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2102                 acpi_bus_generate_proc_event(device, event, 0);
2103                 keycode = KEY_SWITCHVIDEOMODE;
2104                 break;
2105         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2106                 acpi_bus_generate_proc_event(device, event, 0);
2107                 keycode = KEY_VIDEO_NEXT;
2108                 break;
2109         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2110                 acpi_bus_generate_proc_event(device, event, 0);
2111                 keycode = KEY_VIDEO_PREV;
2112                 break;
2113
2114         default:
2115                 keycode = KEY_UNKNOWN;
2116                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2117                                   "Unsupported event [0x%x]\n", event));
2118                 break;
2119         }
2120
2121         acpi_notifier_call_chain(device, event, 0);
2122         input_report_key(input, keycode, 1);
2123         input_sync(input);
2124         input_report_key(input, keycode, 0);
2125         input_sync(input);
2126
2127         return;
2128 }
2129
2130 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2131 {
2132         struct acpi_video_device *video_device = data;
2133         struct acpi_device *device = NULL;
2134         struct acpi_video_bus *bus;
2135         struct input_dev *input;
2136         int keycode;
2137
2138         if (!video_device)
2139                 return;
2140
2141         device = video_device->dev;
2142         bus = video_device->video;
2143         input = bus->input;
2144
2145         switch (event) {
2146         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
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_CYCLE;
2151                 break;
2152         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
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_BRIGHTNESSUP;
2157                 break;
2158         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2159                 if (brightness_switch_enabled)
2160                         acpi_video_switch_brightness(video_device, event);
2161                 acpi_bus_generate_proc_event(device, event, 0);
2162                 keycode = KEY_BRIGHTNESSDOWN;
2163                 break;
2164         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2165                 if (brightness_switch_enabled)
2166                         acpi_video_switch_brightness(video_device, event);
2167                 acpi_bus_generate_proc_event(device, event, 0);
2168                 keycode = KEY_BRIGHTNESS_ZERO;
2169                 break;
2170         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2171                 if (brightness_switch_enabled)
2172                         acpi_video_switch_brightness(video_device, event);
2173                 acpi_bus_generate_proc_event(device, event, 0);
2174                 keycode = KEY_DISPLAY_OFF;
2175                 break;
2176         default:
2177                 keycode = KEY_UNKNOWN;
2178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2179                                   "Unsupported event [0x%x]\n", event));
2180                 break;
2181         }
2182
2183         acpi_notifier_call_chain(device, event, 0);
2184         input_report_key(input, keycode, 1);
2185         input_sync(input);
2186         input_report_key(input, keycode, 0);
2187         input_sync(input);
2188
2189         return;
2190 }
2191
2192 static int instance;
2193 static int acpi_video_resume(struct acpi_device *device)
2194 {
2195         struct acpi_video_bus *video;
2196         struct acpi_video_device *video_device;
2197         int i;
2198
2199         if (!device || !acpi_driver_data(device))
2200                 return -EINVAL;
2201
2202         video = acpi_driver_data(device);
2203
2204         for (i = 0; i < video->attached_count; i++) {
2205                 video_device = video->attached_array[i].bind_info;
2206                 if (video_device && video_device->backlight)
2207                         acpi_video_set_brightness(video_device->backlight);
2208         }
2209         return AE_OK;
2210 }
2211
2212 static int acpi_video_bus_add(struct acpi_device *device)
2213 {
2214         struct acpi_video_bus *video;
2215         struct input_dev *input;
2216         int error;
2217
2218         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2219         if (!video)
2220                 return -ENOMEM;
2221
2222         /* a hack to fix the duplicate name "VID" problem on T61 */
2223         if (!strcmp(device->pnp.bus_id, "VID")) {
2224                 if (instance)
2225                         device->pnp.bus_id[3] = '0' + instance;
2226                 instance ++;
2227         }
2228         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2229         if (!strcmp(device->pnp.bus_id, "VGA")) {
2230                 if (instance)
2231                         device->pnp.bus_id[3] = '0' + instance;
2232                 instance++;
2233         }
2234
2235         video->device = device;
2236         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2237         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2238         device->driver_data = video;
2239
2240         acpi_video_bus_find_cap(video);
2241         error = acpi_video_bus_check(video);
2242         if (error)
2243                 goto err_free_video;
2244
2245         error = acpi_video_bus_add_fs(device);
2246         if (error)
2247                 goto err_free_video;
2248
2249         mutex_init(&video->device_list_lock);
2250         INIT_LIST_HEAD(&video->video_device_list);
2251
2252         acpi_video_bus_get_devices(video, device);
2253         acpi_video_bus_start_devices(video);
2254
2255         video->input = input = input_allocate_device();
2256         if (!input) {
2257                 error = -ENOMEM;
2258                 goto err_stop_video;
2259         }
2260
2261         snprintf(video->phys, sizeof(video->phys),
2262                 "%s/video/input0", acpi_device_hid(video->device));
2263
2264         input->name = acpi_device_name(video->device);
2265         input->phys = video->phys;
2266         input->id.bustype = BUS_HOST;
2267         input->id.product = 0x06;
2268         input->dev.parent = &device->dev;
2269         input->evbit[0] = BIT(EV_KEY);
2270         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2271         set_bit(KEY_VIDEO_NEXT, input->keybit);
2272         set_bit(KEY_VIDEO_PREV, input->keybit);
2273         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2274         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2275         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2276         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2277         set_bit(KEY_DISPLAY_OFF, input->keybit);
2278         set_bit(KEY_UNKNOWN, input->keybit);
2279
2280         error = input_register_device(input);
2281         if (error)
2282                 goto err_free_input_dev;
2283
2284         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2285                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2286                video->flags.multihead ? "yes" : "no",
2287                video->flags.rom ? "yes" : "no",
2288                video->flags.post ? "yes" : "no");
2289
2290         return 0;
2291
2292  err_free_input_dev:
2293         input_free_device(input);
2294  err_stop_video:
2295         acpi_video_bus_stop_devices(video);
2296         acpi_video_bus_put_devices(video);
2297         kfree(video->attached_array);
2298         acpi_video_bus_remove_fs(device);
2299  err_free_video:
2300         kfree(video);
2301         device->driver_data = NULL;
2302
2303         return error;
2304 }
2305
2306 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2307 {
2308         struct acpi_video_bus *video = NULL;
2309
2310
2311         if (!device || !acpi_driver_data(device))
2312                 return -EINVAL;
2313
2314         video = acpi_driver_data(device);
2315
2316         acpi_video_bus_stop_devices(video);
2317         acpi_video_bus_put_devices(video);
2318         acpi_video_bus_remove_fs(device);
2319
2320         input_unregister_device(video->input);
2321         kfree(video->attached_array);
2322         kfree(video);
2323
2324         return 0;
2325 }
2326
2327 static int __init intel_opregion_present(void)
2328 {
2329 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2330         struct pci_dev *dev = NULL;
2331         u32 address;
2332
2333         for_each_pci_dev(dev) {
2334                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2335                         continue;
2336                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2337                         continue;
2338                 pci_read_config_dword(dev, 0xfc, &address);
2339                 if (!address)
2340                         continue;
2341                 return 1;
2342         }
2343 #endif
2344         return 0;
2345 }
2346
2347 int acpi_video_register(void)
2348 {
2349         int result = 0;
2350         if (register_count) {
2351                 /*
2352                  * if the function of acpi_video_register is already called,
2353                  * don't register the acpi_vide_bus again and return no error.
2354                  */
2355                 return 0;
2356         }
2357
2358         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2359         if (!acpi_video_dir)
2360                 return -ENODEV;
2361
2362         result = acpi_bus_register_driver(&acpi_video_bus);
2363         if (result < 0) {
2364                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2365                 return -ENODEV;
2366         }
2367
2368         /*
2369          * When the acpi_video_bus is loaded successfully, increase
2370          * the counter reference.
2371          */
2372         register_count = 1;
2373
2374         return 0;
2375 }
2376 EXPORT_SYMBOL(acpi_video_register);
2377
2378 void acpi_video_unregister(void)
2379 {
2380         if (!register_count) {
2381                 /*
2382                  * If the acpi video bus is already unloaded, don't
2383                  * unload it again and return directly.
2384                  */
2385                 return;
2386         }
2387         acpi_bus_unregister_driver(&acpi_video_bus);
2388
2389         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2390
2391         register_count = 0;
2392
2393         return;
2394 }
2395 EXPORT_SYMBOL(acpi_video_unregister);
2396
2397 /*
2398  * This is kind of nasty. Hardware using Intel chipsets may require
2399  * the video opregion code to be run first in order to initialise
2400  * state before any ACPI video calls are made. To handle this we defer
2401  * registration of the video class until the opregion code has run.
2402  */
2403
2404 static int __init acpi_video_init(void)
2405 {
2406         dmi_check_system(video_dmi_table);
2407
2408         if (intel_opregion_present())
2409                 return 0;
2410
2411         return acpi_video_register();
2412 }
2413
2414 static void __exit acpi_video_exit(void)
2415 {
2416         acpi_video_unregister();
2417
2418         return;
2419 }
2420
2421 module_init(acpi_video_init);
2422 module_exit(acpi_video_exit);