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 *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
 938         memset(&device->cap, 0, sizeof(device->cap));
 939
 940         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 941                 device->cap._ADR = 1;
 942         }
 943         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 944                 device->cap._BCL = 1;
 945         }
 946         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 947                 device->cap._BCM = 1;
 948         }
 949         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 950                 device->cap._BQC = 1;
 951         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 952                                 &h_dummy1))) {
 953                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 954                 device->cap._BCQ = 1;
 955         }
 956
 957         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 958                 device->cap._DDC = 1;
 959         }
 960         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 961                 device->cap._DCS = 1;
 962         }
 963         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 964                 device->cap._DGS = 1;
 965         }
 966         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 967                 device->cap._DSS = 1;
 968         }
 969
 970         if (acpi_video_backlight_support()) {
 971                 int result;
 972                 static int count = 0;
 973                 char *name;
 974
 975                 result = acpi_video_init_brightness(device);
 976                 if (result)
 977                         return;
 978                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 979                 if (!name)
 980                         return;
 981
 982                 sprintf(name, "acpi_video%d", count++);
 983                 device->backlight = backlight_device_register(name,
 984                         NULL, device, &acpi_backlight_ops);
 985                 device->backlight->props.max_brightness = device->brightness->count-3;
 986                 kfree(name);
 987
 988                 result = sysfs_create_link(&device->backlight->dev.kobj,
 989                                            &device->dev->dev.kobj, "device");
 990                 if (result)
 991                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 992
 993                 device->cdev = thermal_cooling_device_register("LCD",
 994                                         device->dev, &video_cooling_ops);
 995                 if (IS_ERR(device->cdev))
 996                         return;
 997
 998                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 999                          device->cdev->id);
1000                 result = sysfs_create_link(&device->dev->dev.kobj,
1001                                 &device->cdev->device.kobj,
1002                                 "thermal_cooling");
1003                 if (result)
1004                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1005                 result = sysfs_create_link(&device->cdev->device.kobj,
1006                                 &device->dev->dev.kobj, "device");
1007                 if (result)
1008                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1009
1010         }
1011
1012         if (acpi_video_display_switch_support()) {
1013
1014                 if (device->cap._DCS && device->cap._DSS) {
1015                         static int count;
1016                         char *name;
1017                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1018                         if (!name)
1019                                 return;
1020                         sprintf(name, "acpi_video%d", count++);
1021                         device->output_dev = video_output_register(name,
1022                                         NULL, device, &acpi_output_properties);
1023                         kfree(name);
1024                 }
1025         }
1026 }
1027
1028 /*
1029  *  Arg:
1030  *      device  : video output device (VGA)
1031  *
1032  *  Return Value:
1033  *      None
1034  *
1035  *  Find out all required AML methods defined under the video bus device.
1036  */
1037
1038 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1039 {
1040         acpi_handle h_dummy1;
1041
1042         memset(&video->cap, 0, sizeof(video->cap));
1043         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1044                 video->cap._DOS = 1;
1045         }
1046         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1047                 video->cap._DOD = 1;
1048         }
1049         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1050                 video->cap._ROM = 1;
1051         }
1052         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1053                 video->cap._GPD = 1;
1054         }
1055         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1056                 video->cap._SPD = 1;
1057         }
1058         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1059                 video->cap._VPO = 1;
1060         }
1061 }
1062
1063 /*
1064  * Check whether the video bus device has required AML method to
1065  * support the desired features
1066  */
1067
1068 static int acpi_video_bus_check(struct acpi_video_bus *video)
1069 {
1070         acpi_status status = -ENOENT;
1071         struct pci_dev *dev;
1072
1073         if (!video)
1074                 return -EINVAL;
1075
1076         dev = acpi_get_pci_dev(video->device->handle);
1077         if (!dev)
1078                 return -ENODEV;
1079         pci_dev_put(dev);
1080
1081         /* Since there is no HID, CID and so on for VGA driver, we have
1082          * to check well known required nodes.
1083          */
1084
1085         /* Does this device support video switching? */
1086         if (video->cap._DOS) {
1087                 video->flags.multihead = 1;
1088                 status = 0;
1089         }
1090
1091         /* Does this device support retrieving a video ROM? */
1092         if (video->cap._ROM) {
1093                 video->flags.rom = 1;
1094                 status = 0;
1095         }
1096
1097         /* Does this device support configuring which video device to POST? */
1098         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1099                 video->flags.post = 1;
1100                 status = 0;
1101         }
1102
1103         return status;
1104 }
1105
1106 /* --------------------------------------------------------------------------
1107                               FS Interface (/proc)
1108    -------------------------------------------------------------------------- */
1109
1110 static struct proc_dir_entry *acpi_video_dir;
1111
1112 /* video devices */
1113
1114 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1115 {
1116         struct acpi_video_device *dev = seq->private;
1117
1118
1119         if (!dev)
1120                 goto end;
1121
1122         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1123         seq_printf(seq, "type:         ");
1124         if (dev->flags.crt)
1125                 seq_printf(seq, "CRT\n");
1126         else if (dev->flags.lcd)
1127                 seq_printf(seq, "LCD\n");
1128         else if (dev->flags.tvout)
1129                 seq_printf(seq, "TVOUT\n");
1130         else if (dev->flags.dvi)
1131                 seq_printf(seq, "DVI\n");
1132         else
1133                 seq_printf(seq, "UNKNOWN\n");
1134
1135         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1136
1137       end:
1138         return 0;
1139 }
1140
1141 static int
1142 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1143 {
1144         return single_open(file, acpi_video_device_info_seq_show,
1145                            PDE(inode)->data);
1146 }
1147
1148 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1149 {
1150         int status;
1151         struct acpi_video_device *dev = seq->private;
1152         unsigned long long state;
1153
1154
1155         if (!dev)
1156                 goto end;
1157
1158         status = acpi_video_device_get_state(dev, &state);
1159         seq_printf(seq, "state:     ");
1160         if (ACPI_SUCCESS(status))
1161                 seq_printf(seq, "0x%02llx\n", state);
1162         else
1163                 seq_printf(seq, "<not supported>\n");
1164
1165         status = acpi_video_device_query(dev, &state);
1166         seq_printf(seq, "query:     ");
1167         if (ACPI_SUCCESS(status))
1168                 seq_printf(seq, "0x%02llx\n", state);
1169         else
1170                 seq_printf(seq, "<not supported>\n");
1171
1172       end:
1173         return 0;
1174 }
1175
1176 static int
1177 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1178 {
1179         return single_open(file, acpi_video_device_state_seq_show,
1180                            PDE(inode)->data);
1181 }
1182
1183 static ssize_t
1184 acpi_video_device_write_state(struct file *file,
1185                               const char __user * buffer,
1186                               size_t count, loff_t * data)
1187 {
1188         int status;
1189         struct seq_file *m = file->private_data;
1190         struct acpi_video_device *dev = m->private;
1191         char str[12] = { 0 };
1192         u32 state = 0;
1193
1194
1195         if (!dev || count + 1 > sizeof str)
1196                 return -EINVAL;
1197
1198         if (copy_from_user(str, buffer, count))
1199                 return -EFAULT;
1200
1201         str[count] = 0;
1202         state = simple_strtoul(str, NULL, 0);
1203         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1204
1205         status = acpi_video_device_set_state(dev, state);
1206
1207         if (status)
1208                 return -EFAULT;
1209
1210         return count;
1211 }
1212
1213 static int
1214 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1215 {
1216         struct acpi_video_device *dev = seq->private;
1217         int i;
1218
1219
1220         if (!dev || !dev->brightness) {
1221                 seq_printf(seq, "<not supported>\n");
1222                 return 0;
1223         }
1224
1225         seq_printf(seq, "levels: ");
1226         for (i = 2; i < dev->brightness->count; i++)
1227                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1228         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1229
1230         return 0;
1231 }
1232
1233 static int
1234 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1235 {
1236         return single_open(file, acpi_video_device_brightness_seq_show,
1237                            PDE(inode)->data);
1238 }
1239
1240 static ssize_t
1241 acpi_video_device_write_brightness(struct file *file,
1242                                    const char __user * buffer,
1243                                    size_t count, loff_t * data)
1244 {
1245         struct seq_file *m = file->private_data;
1246         struct acpi_video_device *dev = m->private;
1247         char str[5] = { 0 };
1248         unsigned int level = 0;
1249         int i;
1250
1251
1252         if (!dev || !dev->brightness || count + 1 > sizeof str)
1253                 return -EINVAL;
1254
1255         if (copy_from_user(str, buffer, count))
1256                 return -EFAULT;
1257
1258         str[count] = 0;
1259         level = simple_strtoul(str, NULL, 0);
1260
1261         if (level > 100)
1262                 return -EFAULT;
1263
1264         /* validate through the list of available levels */
1265         for (i = 2; i < dev->brightness->count; i++)
1266                 if (level == dev->brightness->levels[i]) {
1267                         if (!acpi_video_device_lcd_set_level(dev, level))
1268                                 return count;
1269                         break;
1270                 }
1271
1272         return -EINVAL;
1273 }
1274
1275 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1276 {
1277         struct acpi_video_device *dev = seq->private;
1278         int status;
1279         int i;
1280         union acpi_object *edid = NULL;
1281
1282
1283         if (!dev)
1284                 goto out;
1285
1286         status = acpi_video_device_EDID(dev, &edid, 128);
1287         if (ACPI_FAILURE(status)) {
1288                 status = acpi_video_device_EDID(dev, &edid, 256);
1289         }
1290
1291         if (ACPI_FAILURE(status)) {
1292                 goto out;
1293         }
1294
1295         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1296                 for (i = 0; i < edid->buffer.length; i++)
1297                         seq_putc(seq, edid->buffer.pointer[i]);
1298         }
1299
1300       out:
1301         if (!edid)
1302                 seq_printf(seq, "<not supported>\n");
1303         else
1304                 kfree(edid);
1305
1306         return 0;
1307 }
1308
1309 static int
1310 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1311 {
1312         return single_open(file, acpi_video_device_EDID_seq_show,
1313                            PDE(inode)->data);
1314 }
1315
1316 static int acpi_video_device_add_fs(struct acpi_device *device)
1317 {
1318         struct proc_dir_entry *entry, *device_dir;
1319         struct acpi_video_device *vid_dev;
1320
1321         vid_dev = acpi_driver_data(device);
1322         if (!vid_dev)
1323                 return -ENODEV;
1324
1325         device_dir = proc_mkdir(acpi_device_bid(device),
1326                                 vid_dev->video->dir);
1327         if (!device_dir)
1328                 return -ENOMEM;
1329
1330         /* 'info' [R] */
1331         entry = proc_create_data("info", S_IRUGO, device_dir,
1332                         &acpi_video_device_info_fops, acpi_driver_data(device));
1333         if (!entry)
1334                 goto err_remove_dir;
1335
1336         /* 'state' [R/W] */
1337         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1338                                  device_dir,
1339                                  &acpi_video_device_state_fops,
1340                                  acpi_driver_data(device));
1341         if (!entry)
1342                 goto err_remove_info;
1343
1344         /* 'brightness' [R/W] */
1345         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1346                                  device_dir,
1347                                  &acpi_video_device_brightness_fops,
1348                                  acpi_driver_data(device));
1349         if (!entry)
1350                 goto err_remove_state;
1351
1352         /* 'EDID' [R] */
1353         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1354                                  &acpi_video_device_EDID_fops,
1355                                  acpi_driver_data(device));
1356         if (!entry)
1357                 goto err_remove_brightness;
1358
1359         acpi_device_dir(device) = device_dir;
1360
1361         return 0;
1362
1363  err_remove_brightness:
1364         remove_proc_entry("brightness", device_dir);
1365  err_remove_state:
1366         remove_proc_entry("state", device_dir);
1367  err_remove_info:
1368         remove_proc_entry("info", device_dir);
1369  err_remove_dir:
1370         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1371         return -ENOMEM;
1372 }
1373
1374 static int acpi_video_device_remove_fs(struct acpi_device *device)
1375 {
1376         struct acpi_video_device *vid_dev;
1377         struct proc_dir_entry *device_dir;
1378
1379         vid_dev = acpi_driver_data(device);
1380         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1381                 return -ENODEV;
1382
1383         device_dir = acpi_device_dir(device);
1384         if (device_dir) {
1385                 remove_proc_entry("info", device_dir);
1386                 remove_proc_entry("state", device_dir);
1387                 remove_proc_entry("brightness", device_dir);
1388                 remove_proc_entry("EDID", device_dir);
1389                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1390                 acpi_device_dir(device) = NULL;
1391         }
1392
1393         return 0;
1394 }
1395
1396 /* video bus */
1397 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1398 {
1399         struct acpi_video_bus *video = seq->private;
1400
1401
1402         if (!video)
1403                 goto end;
1404
1405         seq_printf(seq, "Switching heads:              %s\n",
1406                    video->flags.multihead ? "yes" : "no");
1407         seq_printf(seq, "Video ROM:                    %s\n",
1408                    video->flags.rom ? "yes" : "no");
1409         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1410                    video->flags.post ? "yes" : "no");
1411
1412       end:
1413         return 0;
1414 }
1415
1416 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1417 {
1418         return single_open(file, acpi_video_bus_info_seq_show,
1419                            PDE(inode)->data);
1420 }
1421
1422 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1423 {
1424         struct acpi_video_bus *video = seq->private;
1425
1426
1427         if (!video)
1428                 goto end;
1429
1430         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1431         seq_printf(seq, "<TODO>\n");
1432
1433       end:
1434         return 0;
1435 }
1436
1437 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1438 {
1439         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1440 }
1441
1442 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1443 {
1444         struct acpi_video_bus *video = seq->private;
1445         unsigned long long options;
1446         int status;
1447
1448
1449         if (!video)
1450                 goto end;
1451
1452         status = acpi_video_bus_POST_options(video, &options);
1453         if (ACPI_SUCCESS(status)) {
1454                 if (!(options & 1)) {
1455                         printk(KERN_WARNING PREFIX
1456                                "The motherboard VGA device is not listed as a possible POST device.\n");
1457                         printk(KERN_WARNING PREFIX
1458                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1459                 }
1460                 printk(KERN_WARNING "%llx\n", options);
1461                 seq_printf(seq, "can POST: <integrated video>");
1462                 if (options & 2)
1463                         seq_printf(seq, " <PCI video>");
1464                 if (options & 4)
1465                         seq_printf(seq, " <AGP video>");
1466                 seq_putc(seq, '\n');
1467         } else
1468                 seq_printf(seq, "<not supported>\n");
1469       end:
1470         return 0;
1471 }
1472
1473 static int
1474 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1475 {
1476         return single_open(file, acpi_video_bus_POST_info_seq_show,
1477                            PDE(inode)->data);
1478 }
1479
1480 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1481 {
1482         struct acpi_video_bus *video = seq->private;
1483         int status;
1484         unsigned long long id;
1485
1486
1487         if (!video)
1488                 goto end;
1489
1490         status = acpi_video_bus_get_POST(video, &id);
1491         if (!ACPI_SUCCESS(status)) {
1492                 seq_printf(seq, "<not supported>\n");
1493                 goto end;
1494         }
1495         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1496
1497       end:
1498         return 0;
1499 }
1500
1501 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1502 {
1503         struct acpi_video_bus *video = seq->private;
1504
1505
1506         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1507
1508         return 0;
1509 }
1510
1511 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1512 {
1513         return single_open(file, acpi_video_bus_POST_seq_show,
1514                            PDE(inode)->data);
1515 }
1516
1517 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1518 {
1519         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1520 }
1521
1522 static ssize_t
1523 acpi_video_bus_write_POST(struct file *file,
1524                           const char __user * buffer,
1525                           size_t count, loff_t * data)
1526 {
1527         int status;
1528         struct seq_file *m = file->private_data;
1529         struct acpi_video_bus *video = m->private;
1530         char str[12] = { 0 };
1531         unsigned long long opt, options;
1532
1533
1534         if (!video || count + 1 > sizeof str)
1535                 return -EINVAL;
1536
1537         status = acpi_video_bus_POST_options(video, &options);
1538         if (!ACPI_SUCCESS(status))
1539                 return -EINVAL;
1540
1541         if (copy_from_user(str, buffer, count))
1542                 return -EFAULT;
1543
1544         str[count] = 0;
1545         opt = strtoul(str, NULL, 0);
1546         if (opt > 3)
1547                 return -EFAULT;
1548
1549         /* just in case an OEM 'forgot' the motherboard... */
1550         options |= 1;
1551
1552         if (options & (1ul << opt)) {
1553                 status = acpi_video_bus_set_POST(video, opt);
1554                 if (!ACPI_SUCCESS(status))
1555                         return -EFAULT;
1556
1557         }
1558
1559         return count;
1560 }
1561
1562 static ssize_t
1563 acpi_video_bus_write_DOS(struct file *file,
1564                          const char __user * buffer,
1565                          size_t count, loff_t * data)
1566 {
1567         int status;
1568         struct seq_file *m = file->private_data;
1569         struct acpi_video_bus *video = m->private;
1570         char str[12] = { 0 };
1571         unsigned long opt;
1572
1573
1574         if (!video || count + 1 > sizeof str)
1575                 return -EINVAL;
1576
1577         if (copy_from_user(str, buffer, count))
1578                 return -EFAULT;
1579
1580         str[count] = 0;
1581         opt = strtoul(str, NULL, 0);
1582         if (opt > 7)
1583                 return -EFAULT;
1584
1585         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1586
1587         if (!ACPI_SUCCESS(status))
1588                 return -EFAULT;
1589
1590         return count;
1591 }
1592
1593 static int acpi_video_bus_add_fs(struct acpi_device *device)
1594 {
1595         struct acpi_video_bus *video = acpi_driver_data(device);
1596         struct proc_dir_entry *device_dir;
1597         struct proc_dir_entry *entry;
1598
1599         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1600         if (!device_dir)
1601                 return -ENOMEM;
1602
1603         /* 'info' [R] */
1604         entry = proc_create_data("info", S_IRUGO, device_dir,
1605                                  &acpi_video_bus_info_fops,
1606                                  acpi_driver_data(device));
1607         if (!entry)
1608                 goto err_remove_dir;
1609
1610         /* 'ROM' [R] */
1611         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1612                                  &acpi_video_bus_ROM_fops,
1613                                  acpi_driver_data(device));
1614         if (!entry)
1615                 goto err_remove_info;
1616
1617         /* 'POST_info' [R] */
1618         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1619                                  &acpi_video_bus_POST_info_fops,
1620                                  acpi_driver_data(device));
1621         if (!entry)
1622                 goto err_remove_rom;
1623
1624         /* 'POST' [R/W] */
1625         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1626                                  device_dir,
1627                                  &acpi_video_bus_POST_fops,
1628                                  acpi_driver_data(device));
1629         if (!entry)
1630                 goto err_remove_post_info;
1631
1632         /* 'DOS' [R/W] */
1633         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1634                                  device_dir,
1635                                  &acpi_video_bus_DOS_fops,
1636                                  acpi_driver_data(device));
1637         if (!entry)
1638                 goto err_remove_post;
1639
1640         video->dir = acpi_device_dir(device) = device_dir;
1641         return 0;
1642
1643  err_remove_post:
1644         remove_proc_entry("POST", device_dir);
1645  err_remove_post_info:
1646         remove_proc_entry("POST_info", device_dir);
1647  err_remove_rom:
1648         remove_proc_entry("ROM", device_dir);
1649  err_remove_info:
1650         remove_proc_entry("info", device_dir);
1651  err_remove_dir:
1652         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1653         return -ENOMEM;
1654 }
1655
1656 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1657 {
1658         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1659
1660         if (device_dir) {
1661                 remove_proc_entry("info", device_dir);
1662                 remove_proc_entry("ROM", device_dir);
1663                 remove_proc_entry("POST_info", device_dir);
1664                 remove_proc_entry("POST", device_dir);
1665                 remove_proc_entry("DOS", device_dir);
1666                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1667                 acpi_device_dir(device) = NULL;
1668         }
1669
1670         return 0;
1671 }
1672
1673 /* --------------------------------------------------------------------------
1674                                  Driver Interface
1675    -------------------------------------------------------------------------- */
1676
1677 /* device interface */
1678 static struct acpi_video_device_attrib*
1679 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1680 {
1681         struct acpi_video_enumerated_device *ids;
1682         int i;
1683
1684         for (i = 0; i < video->attached_count; i++) {
1685                 ids = &video->attached_array[i];
1686                 if ((ids->value.int_val & 0xffff) == device_id)
1687                         return &ids->value.attrib;
1688         }
1689
1690         return NULL;
1691 }
1692
1693 static int
1694 acpi_video_bus_get_one_device(struct acpi_device *device,
1695                               struct acpi_video_bus *video)
1696 {
1697         unsigned long long device_id;
1698         int status;
1699         struct acpi_video_device *data;
1700         struct acpi_video_device_attrib* attribute;
1701
1702         if (!device || !video)
1703                 return -EINVAL;
1704
1705         status =
1706             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1707         if (ACPI_SUCCESS(status)) {
1708
1709                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1710                 if (!data)
1711                         return -ENOMEM;
1712
1713                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1714                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1715                 device->driver_data = data;
1716
1717                 data->device_id = device_id;
1718                 data->video = video;
1719                 data->dev = device;
1720
1721                 attribute = acpi_video_get_device_attr(video, device_id);
1722
1723                 if((attribute != NULL) && attribute->device_id_scheme) {
1724                         switch (attribute->display_type) {
1725                         case ACPI_VIDEO_DISPLAY_CRT:
1726                                 data->flags.crt = 1;
1727                                 break;
1728                         case ACPI_VIDEO_DISPLAY_TV:
1729                                 data->flags.tvout = 1;
1730                                 break;
1731                         case ACPI_VIDEO_DISPLAY_DVI:
1732                                 data->flags.dvi = 1;
1733                                 break;
1734                         case ACPI_VIDEO_DISPLAY_LCD:
1735                                 data->flags.lcd = 1;
1736                                 break;
1737                         default:
1738                                 data->flags.unknown = 1;
1739                                 break;
1740                         }
1741                         if(attribute->bios_can_detect)
1742                                 data->flags.bios = 1;
1743                 } else
1744                         data->flags.unknown = 1;
1745
1746                 acpi_video_device_bind(video, data);
1747                 acpi_video_device_find_cap(data);
1748
1749                 status = acpi_install_notify_handler(device->handle,
1750                                                      ACPI_DEVICE_NOTIFY,
1751                                                      acpi_video_device_notify,
1752                                                      data);
1753                 if (ACPI_FAILURE(status)) {
1754                         printk(KERN_ERR PREFIX
1755                                           "Error installing notify handler\n");
1756                         if(data->brightness)
1757                                 kfree(data->brightness->levels);
1758                         kfree(data->brightness);
1759                         kfree(data);
1760                         return -ENODEV;
1761                 }
1762
1763                 mutex_lock(&video->device_list_lock);
1764                 list_add_tail(&data->entry, &video->video_device_list);
1765                 mutex_unlock(&video->device_list_lock);
1766
1767                 acpi_video_device_add_fs(device);
1768
1769                 return 0;
1770         }
1771
1772         return -ENOENT;
1773 }
1774
1775 /*
1776  *  Arg:
1777  *      video   : video bus device
1778  *
1779  *  Return:
1780  *      none
1781  *
1782  *  Enumerate the video device list of the video bus,
1783  *  bind the ids with the corresponding video devices
1784  *  under the video bus.
1785  */
1786
1787 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1788 {
1789         struct acpi_video_device *dev;
1790
1791         mutex_lock(&video->device_list_lock);
1792
1793         list_for_each_entry(dev, &video->video_device_list, entry)
1794                 acpi_video_device_bind(video, dev);
1795
1796         mutex_unlock(&video->device_list_lock);
1797 }
1798
1799 /*
1800  *  Arg:
1801  *      video   : video bus device
1802  *      device  : video output device under the video
1803  *              bus
1804  *
1805  *  Return:
1806  *      none
1807  *
1808  *  Bind the ids with the corresponding video devices
1809  *  under the video bus.
1810  */
1811
1812 static void
1813 acpi_video_device_bind(struct acpi_video_bus *video,
1814                        struct acpi_video_device *device)
1815 {
1816         struct acpi_video_enumerated_device *ids;
1817         int i;
1818
1819         for (i = 0; i < video->attached_count; i++) {
1820                 ids = &video->attached_array[i];
1821                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1822                         ids->bind_info = device;
1823                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1824                 }
1825         }
1826 }
1827
1828 /*
1829  *  Arg:
1830  *      video   : video bus device
1831  *
1832  *  Return:
1833  *      < 0     : error
1834  *
1835  *  Call _DOD to enumerate all devices attached to display adapter
1836  *
1837  */
1838
1839 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1840 {
1841         int status;
1842         int count;
1843         int i;
1844         struct acpi_video_enumerated_device *active_list;
1845         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1846         union acpi_object *dod = NULL;
1847         union acpi_object *obj;
1848
1849         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1850         if (!ACPI_SUCCESS(status)) {
1851                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1852                 return status;
1853         }
1854
1855         dod = buffer.pointer;
1856         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1857                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1858                 status = -EFAULT;
1859                 goto out;
1860         }
1861
1862         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1863                           dod->package.count));
1864
1865         active_list = kcalloc(1 + dod->package.count,
1866                               sizeof(struct acpi_video_enumerated_device),
1867                               GFP_KERNEL);
1868         if (!active_list) {
1869                 status = -ENOMEM;
1870                 goto out;
1871         }
1872
1873         count = 0;
1874         for (i = 0; i < dod->package.count; i++) {
1875                 obj = &dod->package.elements[i];
1876
1877                 if (obj->type != ACPI_TYPE_INTEGER) {
1878                         printk(KERN_ERR PREFIX
1879                                 "Invalid _DOD data in element %d\n", i);
1880                         continue;
1881                 }
1882
1883                 active_list[count].value.int_val = obj->integer.value;
1884                 active_list[count].bind_info = NULL;
1885                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1886                                   (int)obj->integer.value));
1887                 count++;
1888         }
1889
1890         kfree(video->attached_array);
1891
1892         video->attached_array = active_list;
1893         video->attached_count = count;
1894
1895  out:
1896         kfree(buffer.pointer);
1897         return status;
1898 }
1899
1900 static int
1901 acpi_video_get_next_level(struct acpi_video_device *device,
1902                           u32 level_current, u32 event)
1903 {
1904         int min, max, min_above, max_below, i, l, delta = 255;
1905         max = max_below = 0;
1906         min = min_above = 255;
1907         /* Find closest level to level_current */
1908         for (i = 2; i < device->brightness->count; i++) {
1909                 l = device->brightness->levels[i];
1910                 if (abs(l - level_current) < abs(delta)) {
1911                         delta = l - level_current;
1912                         if (!delta)
1913                                 break;
1914                 }
1915         }
1916         /* Ajust level_current to closest available level */
1917         level_current += delta;
1918         for (i = 2; i < device->brightness->count; i++) {
1919                 l = device->brightness->levels[i];
1920                 if (l < min)
1921                         min = l;
1922                 if (l > max)
1923                         max = l;
1924                 if (l < min_above && l > level_current)
1925                         min_above = l;
1926                 if (l > max_below && l < level_current)
1927                         max_below = l;
1928         }
1929
1930         switch (event) {
1931         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1932                 return (level_current < max) ? min_above : min;
1933         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1934                 return (level_current < max) ? min_above : max;
1935         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1936                 return (level_current > min) ? max_below : min;
1937         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1938         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1939                 return 0;
1940         default:
1941                 return level_current;
1942         }
1943 }
1944
1945 static int
1946 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1947 {
1948         unsigned long long level_current, level_next;
1949         int result = -EINVAL;
1950
1951         if (!device->brightness)
1952                 goto out;
1953
1954         result = acpi_video_device_lcd_get_level_current(device,
1955                                                          &level_current);
1956         if (result)
1957                 goto out;
1958
1959         level_next = acpi_video_get_next_level(device, level_current, event);
1960
1961         result = acpi_video_device_lcd_set_level(device, level_next);
1962
1963 out:
1964         if (result)
1965                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1966
1967         return result;
1968 }
1969
1970 static int
1971 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1972                            struct acpi_device *device)
1973 {
1974         int status = 0;
1975         struct acpi_device *dev;
1976
1977         acpi_video_device_enumerate(video);
1978
1979         list_for_each_entry(dev, &device->children, node) {
1980
1981                 status = acpi_video_bus_get_one_device(dev, video);
1982                 if (ACPI_FAILURE(status)) {
1983                         printk(KERN_WARNING PREFIX
1984                                         "Cant attach device");
1985                         continue;
1986                 }
1987         }
1988         return status;
1989 }
1990
1991 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1992 {
1993         acpi_status status;
1994         struct acpi_video_bus *video;
1995
1996
1997         if (!device || !device->video)
1998                 return -ENOENT;
1999
2000         video = device->video;
2001
2002         acpi_video_device_remove_fs(device->dev);
2003
2004         status = acpi_remove_notify_handler(device->dev->handle,
2005                                             ACPI_DEVICE_NOTIFY,
2006                                             acpi_video_device_notify);
2007         if (device->backlight) {
2008                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2009                 backlight_device_unregister(device->backlight);
2010                 device->backlight = NULL;
2011         }
2012         if (device->cdev) {
2013                 sysfs_remove_link(&device->dev->dev.kobj,
2014                                   "thermal_cooling");
2015                 sysfs_remove_link(&device->cdev->device.kobj,
2016                                   "device");
2017                 thermal_cooling_device_unregister(device->cdev);
2018                 device->cdev = NULL;
2019         }
2020         video_output_unregister(device->output_dev);
2021
2022         return 0;
2023 }
2024
2025 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2026 {
2027         int status;
2028         struct acpi_video_device *dev, *next;
2029
2030         mutex_lock(&video->device_list_lock);
2031
2032         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2033
2034                 status = acpi_video_bus_put_one_device(dev);
2035                 if (ACPI_FAILURE(status))
2036                         printk(KERN_WARNING PREFIX
2037                                "hhuuhhuu bug in acpi video driver.\n");
2038
2039                 if (dev->brightness) {
2040                         kfree(dev->brightness->levels);
2041                         kfree(dev->brightness);
2042                 }
2043                 list_del(&dev->entry);
2044                 kfree(dev);
2045         }
2046
2047         mutex_unlock(&video->device_list_lock);
2048
2049         return 0;
2050 }
2051
2052 /* acpi_video interface */
2053
2054 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2055 {
2056         return acpi_video_bus_DOS(video, 0, 0);
2057 }
2058
2059 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2060 {
2061         return acpi_video_bus_DOS(video, 0, 1);
2062 }
2063
2064 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2065 {
2066         struct acpi_video_bus *video = acpi_driver_data(device);
2067         struct input_dev *input;
2068         int keycode;
2069
2070         if (!video)
2071                 return;
2072
2073         input = video->input;
2074
2075         switch (event) {
2076         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2077                                          * most likely via hotkey. */
2078                 acpi_bus_generate_proc_event(device, event, 0);
2079                 keycode = KEY_SWITCHVIDEOMODE;
2080                 break;
2081
2082         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2083                                          * connector. */
2084                 acpi_video_device_enumerate(video);
2085                 acpi_video_device_rebind(video);
2086                 acpi_bus_generate_proc_event(device, event, 0);
2087                 keycode = KEY_SWITCHVIDEOMODE;
2088                 break;
2089
2090         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2091                 acpi_bus_generate_proc_event(device, event, 0);
2092                 keycode = KEY_SWITCHVIDEOMODE;
2093                 break;
2094         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2095                 acpi_bus_generate_proc_event(device, event, 0);
2096                 keycode = KEY_VIDEO_NEXT;
2097                 break;
2098         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2099                 acpi_bus_generate_proc_event(device, event, 0);
2100                 keycode = KEY_VIDEO_PREV;
2101                 break;
2102
2103         default:
2104                 keycode = KEY_UNKNOWN;
2105                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2106                                   "Unsupported event [0x%x]\n", event));
2107                 break;
2108         }
2109
2110         acpi_notifier_call_chain(device, event, 0);
2111         input_report_key(input, keycode, 1);
2112         input_sync(input);
2113         input_report_key(input, keycode, 0);
2114         input_sync(input);
2115
2116         return;
2117 }
2118
2119 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2120 {
2121         struct acpi_video_device *video_device = data;
2122         struct acpi_device *device = NULL;
2123         struct acpi_video_bus *bus;
2124         struct input_dev *input;
2125         int keycode;
2126
2127         if (!video_device)
2128                 return;
2129
2130         device = video_device->dev;
2131         bus = video_device->video;
2132         input = bus->input;
2133
2134         switch (event) {
2135         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2136                 if (brightness_switch_enabled)
2137                         acpi_video_switch_brightness(video_device, event);
2138                 acpi_bus_generate_proc_event(device, event, 0);
2139                 keycode = KEY_BRIGHTNESS_CYCLE;
2140                 break;
2141         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2142                 if (brightness_switch_enabled)
2143                         acpi_video_switch_brightness(video_device, event);
2144                 acpi_bus_generate_proc_event(device, event, 0);
2145                 keycode = KEY_BRIGHTNESSUP;
2146                 break;
2147         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2148                 if (brightness_switch_enabled)
2149                         acpi_video_switch_brightness(video_device, event);
2150                 acpi_bus_generate_proc_event(device, event, 0);
2151                 keycode = KEY_BRIGHTNESSDOWN;
2152                 break;
2153         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2154                 if (brightness_switch_enabled)
2155                         acpi_video_switch_brightness(video_device, event);
2156                 acpi_bus_generate_proc_event(device, event, 0);
2157                 keycode = KEY_BRIGHTNESS_ZERO;
2158                 break;
2159         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2160                 if (brightness_switch_enabled)
2161                         acpi_video_switch_brightness(video_device, event);
2162                 acpi_bus_generate_proc_event(device, event, 0);
2163                 keycode = KEY_DISPLAY_OFF;
2164                 break;
2165         default:
2166                 keycode = KEY_UNKNOWN;
2167                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2168                                   "Unsupported event [0x%x]\n", event));
2169                 break;
2170         }
2171
2172         acpi_notifier_call_chain(device, event, 0);
2173         input_report_key(input, keycode, 1);
2174         input_sync(input);
2175         input_report_key(input, keycode, 0);
2176         input_sync(input);
2177
2178         return;
2179 }
2180
2181 static int instance;
2182 static int acpi_video_resume(struct acpi_device *device)
2183 {
2184         struct acpi_video_bus *video;
2185         struct acpi_video_device *video_device;
2186         int i;
2187
2188         if (!device || !acpi_driver_data(device))
2189                 return -EINVAL;
2190
2191         video = acpi_driver_data(device);
2192
2193         for (i = 0; i < video->attached_count; i++) {
2194                 video_device = video->attached_array[i].bind_info;
2195                 if (video_device && video_device->backlight)
2196                         acpi_video_set_brightness(video_device->backlight);
2197         }
2198         return AE_OK;
2199 }
2200
2201 static int acpi_video_bus_add(struct acpi_device *device)
2202 {
2203         struct acpi_video_bus *video;
2204         struct input_dev *input;
2205         int error;
2206
2207         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2208         if (!video)
2209                 return -ENOMEM;
2210
2211         /* a hack to fix the duplicate name "VID" problem on T61 */
2212         if (!strcmp(device->pnp.bus_id, "VID")) {
2213                 if (instance)
2214                         device->pnp.bus_id[3] = '0' + instance;
2215                 instance ++;
2216         }
2217         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2218         if (!strcmp(device->pnp.bus_id, "VGA")) {
2219                 if (instance)
2220                         device->pnp.bus_id[3] = '0' + instance;
2221                 instance++;
2222         }
2223
2224         video->device = device;
2225         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2226         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2227         device->driver_data = video;
2228
2229         acpi_video_bus_find_cap(video);
2230         error = acpi_video_bus_check(video);
2231         if (error)
2232                 goto err_free_video;
2233
2234         error = acpi_video_bus_add_fs(device);
2235         if (error)
2236                 goto err_free_video;
2237
2238         mutex_init(&video->device_list_lock);
2239         INIT_LIST_HEAD(&video->video_device_list);
2240
2241         acpi_video_bus_get_devices(video, device);
2242         acpi_video_bus_start_devices(video);
2243
2244         video->input = input = input_allocate_device();
2245         if (!input) {
2246                 error = -ENOMEM;
2247                 goto err_stop_video;
2248         }
2249
2250         snprintf(video->phys, sizeof(video->phys),
2251                 "%s/video/input0", acpi_device_hid(video->device));
2252
2253         input->name = acpi_device_name(video->device);
2254         input->phys = video->phys;
2255         input->id.bustype = BUS_HOST;
2256         input->id.product = 0x06;
2257         input->dev.parent = &device->dev;
2258         input->evbit[0] = BIT(EV_KEY);
2259         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2260         set_bit(KEY_VIDEO_NEXT, input->keybit);
2261         set_bit(KEY_VIDEO_PREV, input->keybit);
2262         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2263         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2264         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2265         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2266         set_bit(KEY_DISPLAY_OFF, input->keybit);
2267         set_bit(KEY_UNKNOWN, input->keybit);
2268
2269         error = input_register_device(input);
2270         if (error)
2271                 goto err_free_input_dev;
2272
2273         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2274                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2275                video->flags.multihead ? "yes" : "no",
2276                video->flags.rom ? "yes" : "no",
2277                video->flags.post ? "yes" : "no");
2278
2279         return 0;
2280
2281  err_free_input_dev:
2282         input_free_device(input);
2283  err_stop_video:
2284         acpi_video_bus_stop_devices(video);
2285         acpi_video_bus_put_devices(video);
2286         kfree(video->attached_array);
2287         acpi_video_bus_remove_fs(device);
2288  err_free_video:
2289         kfree(video);
2290         device->driver_data = NULL;
2291
2292         return error;
2293 }
2294
2295 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2296 {
2297         struct acpi_video_bus *video = NULL;
2298
2299
2300         if (!device || !acpi_driver_data(device))
2301                 return -EINVAL;
2302
2303         video = acpi_driver_data(device);
2304
2305         acpi_video_bus_stop_devices(video);
2306         acpi_video_bus_put_devices(video);
2307         acpi_video_bus_remove_fs(device);
2308
2309         input_unregister_device(video->input);
2310         kfree(video->attached_array);
2311         kfree(video);
2312
2313         return 0;
2314 }
2315
2316 static int __init intel_opregion_present(void)
2317 {
2318 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2319         struct pci_dev *dev = NULL;
2320         u32 address;
2321
2322         for_each_pci_dev(dev) {
2323                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2324                         continue;
2325                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2326                         continue;
2327                 pci_read_config_dword(dev, 0xfc, &address);
2328                 if (!address)
2329                         continue;
2330                 return 1;
2331         }
2332 #endif
2333         return 0;
2334 }
2335
2336 int acpi_video_register(void)
2337 {
2338         int result = 0;
2339         if (register_count) {
2340                 /*
2341                  * if the function of acpi_video_register is already called,
2342                  * don't register the acpi_vide_bus again and return no error.
2343                  */
2344                 return 0;
2345         }
2346
2347         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2348         if (!acpi_video_dir)
2349                 return -ENODEV;
2350
2351         result = acpi_bus_register_driver(&acpi_video_bus);
2352         if (result < 0) {
2353                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2354                 return -ENODEV;
2355         }
2356
2357         /*
2358          * When the acpi_video_bus is loaded successfully, increase
2359          * the counter reference.
2360          */
2361         register_count = 1;
2362
2363         return 0;
2364 }
2365 EXPORT_SYMBOL(acpi_video_register);
2366
2367 void acpi_video_unregister(void)
2368 {
2369         if (!register_count) {
2370                 /*
2371                  * If the acpi video bus is already unloaded, don't
2372                  * unload it again and return directly.
2373                  */
2374                 return;
2375         }
2376         acpi_bus_unregister_driver(&acpi_video_bus);
2377
2378         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2379
2380         register_count = 0;
2381
2382         return;
2383 }
2384 EXPORT_SYMBOL(acpi_video_unregister);
2385
2386 /*
2387  * This is kind of nasty. Hardware using Intel chipsets may require
2388  * the video opregion code to be run first in order to initialise
2389  * state before any ACPI video calls are made. To handle this we defer
2390  * registration of the video class until the opregion code has run.
2391  */
2392
2393 static int __init acpi_video_init(void)
2394 {
2395         dmi_check_system(video_dmi_table);
2396
2397         if (intel_opregion_present())
2398                 return 0;
2399
2400         return acpi_video_register();
2401 }
2402
2403 static void __exit acpi_video_exit(void)
2404 {
2405         acpi_video_unregister();
2406
2407         return;
2408 }
2409
2410 module_init(acpi_video_init);
2411 module_exit(acpi_video_exit);