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 #include <linux/dmi.h>
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_CLASS                "video"
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define ACPI_VIDEO_DISPLAY_CRT  1
  67 #define ACPI_VIDEO_DISPLAY_TV   2
  68 #define ACPI_VIDEO_DISPLAY_DVI  3
  69 #define ACPI_VIDEO_DISPLAY_LCD  4
  70
  71 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  72 ACPI_MODULE_NAME("video");
  73
  74 MODULE_AUTHOR("Bruno Ducrot");
  75 MODULE_DESCRIPTION("ACPI Video Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int brightness_switch_enabled = 1;
  79 module_param(brightness_switch_enabled, bool, 0644);
  80
  81 static int register_count = 0;
  82 static int acpi_video_bus_add(struct acpi_device *device);
  83 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  84 static int acpi_video_resume(struct acpi_device *device);
  85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  86
  87 static const struct acpi_device_id video_device_ids[] = {
  88         {ACPI_VIDEO_HID, 0},
  89         {"", 0},
  90 };
  91 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  92
  93 static struct acpi_driver acpi_video_bus = {
  94         .name = "video",
  95         .class = ACPI_VIDEO_CLASS,
  96         .ids = video_device_ids,
  97         .ops = {
  98                 .add = acpi_video_bus_add,
  99                 .remove = acpi_video_bus_remove,
 100                 .resume = acpi_video_resume,
 101                 .notify = acpi_video_bus_notify,
 102                 },
 103 };
 104
 105 struct acpi_video_bus_flags {
 106         u8 multihead:1;         /* can switch video heads */
 107         u8 rom:1;               /* can retrieve a video rom */
 108         u8 post:1;              /* can configure the head to */
 109         u8 reserved:5;
 110 };
 111
 112 struct acpi_video_bus_cap {
 113         u8 _DOS:1;              /*Enable/Disable output switching */
 114         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 115         u8 _ROM:1;              /*Get ROM Data */
 116         u8 _GPD:1;              /*Get POST Device */
 117         u8 _SPD:1;              /*Set POST Device */
 118         u8 _VPO:1;              /*Video POST Options */
 119         u8 reserved:2;
 120 };
 121
 122 struct acpi_video_device_attrib {
 123         u32 display_index:4;    /* A zero-based instance of the Display */
 124         u32 display_port_attachment:4;  /*This field differentiates the display type */
 125         u32 display_type:4;     /*Describe the specific type in use */
 126         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 127         u32 bios_can_detect:1;  /*BIOS can detect the device */
 128         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 129                                    the VGA device. */
 130         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 131         u32 reserved:10;        /*Must be 0 */
 132         u32 device_id_scheme:1; /*Device ID Scheme */
 133 };
 134
 135 struct acpi_video_enumerated_device {
 136         union {
 137                 u32 int_val;
 138                 struct acpi_video_device_attrib attrib;
 139         } value;
 140         struct acpi_video_device *bind_info;
 141 };
 142
 143 struct acpi_video_bus {
 144         struct acpi_device *device;
 145         u8 dos_setting;
 146         struct acpi_video_enumerated_device *attached_array;
 147         u8 attached_count;
 148         struct acpi_video_bus_cap cap;
 149         struct acpi_video_bus_flags flags;
 150         struct list_head video_device_list;
 151         struct mutex device_list_lock;  /* protects video_device_list */
 152         struct proc_dir_entry *dir;
 153         struct input_dev *input;
 154         char phys[32];  /* for input device */
 155 };
 156
 157 struct acpi_video_device_flags {
 158         u8 crt:1;
 159         u8 lcd:1;
 160         u8 tvout:1;
 161         u8 dvi:1;
 162         u8 bios:1;
 163         u8 unknown:1;
 164         u8 reserved:2;
 165 };
 166
 167 struct acpi_video_device_cap {
 168         u8 _ADR:1;              /*Return the unique ID */
 169         u8 _BCL:1;              /*Query list of brightness control levels supported */
 170         u8 _BCM:1;              /*Set the brightness level */
 171         u8 _BQC:1;              /* Get current brightness level */
 172         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 173         u8 _DDC:1;              /*Return the EDID for this device */
 174         u8 _DCS:1;              /*Return status of output device */
 175         u8 _DGS:1;              /*Query graphics state */
 176         u8 _DSS:1;              /*Device state set */
 177 };
 178
 179 struct acpi_video_brightness_flags {
 180         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 181         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 182         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 183         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 184         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 185 };
 186
 187 struct acpi_video_device_brightness {
 188         int curr;
 189         int count;
 190         int *levels;
 191         struct acpi_video_brightness_flags flags;
 192 };
 193
 194 struct acpi_video_device {
 195         unsigned long device_id;
 196         struct acpi_video_device_flags flags;
 197         struct acpi_video_device_cap cap;
 198         struct list_head entry;
 199         struct acpi_video_bus *video;
 200         struct acpi_device *dev;
 201         struct acpi_video_device_brightness *brightness;
 202         struct backlight_device *backlight;
 203         struct thermal_cooling_device *cooling_dev;
 204         struct output_device *output_dev;
 205 };
 206
 207 /* bus */
 208 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 209 static const struct file_operations acpi_video_bus_info_fops = {
 210         .owner = THIS_MODULE,
 211         .open = acpi_video_bus_info_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 218 static const struct file_operations acpi_video_bus_ROM_fops = {
 219         .owner = THIS_MODULE,
 220         .open = acpi_video_bus_ROM_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 227                                             struct file *file);
 228 static const struct file_operations acpi_video_bus_POST_info_fops = {
 229         .owner = THIS_MODULE,
 230         .open = acpi_video_bus_POST_info_open_fs,
 231         .read = seq_read,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 237 static ssize_t acpi_video_bus_write_POST(struct file *file,
 238         const char __user *buffer, size_t count, loff_t *data);
 239 static const struct file_operations acpi_video_bus_POST_fops = {
 240         .owner = THIS_MODULE,
 241         .open = acpi_video_bus_POST_open_fs,
 242         .read = seq_read,
 243         .write = acpi_video_bus_write_POST,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 249 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 250         const char __user *buffer, size_t count, loff_t *data);
 251 static const struct file_operations acpi_video_bus_DOS_fops = {
 252         .owner = THIS_MODULE,
 253         .open = acpi_video_bus_DOS_open_fs,
 254         .read = seq_read,
 255         .write = acpi_video_bus_write_DOS,
 256         .llseek = seq_lseek,
 257         .release = single_release,
 258 };
 259
 260 /* device */
 261 static int acpi_video_device_info_open_fs(struct inode *inode,
 262                                           struct file *file);
 263 static const struct file_operations acpi_video_device_info_fops = {
 264         .owner = THIS_MODULE,
 265         .open = acpi_video_device_info_open_fs,
 266         .read = seq_read,
 267         .llseek = seq_lseek,
 268         .release = single_release,
 269 };
 270
 271 static int acpi_video_device_state_open_fs(struct inode *inode,
 272                                            struct file *file);
 273 static ssize_t acpi_video_device_write_state(struct file *file,
 274         const char __user *buffer, size_t count, loff_t *data);
 275 static const struct file_operations acpi_video_device_state_fops = {
 276         .owner = THIS_MODULE,
 277         .open = acpi_video_device_state_open_fs,
 278         .read = seq_read,
 279         .write = acpi_video_device_write_state,
 280         .llseek = seq_lseek,
 281         .release = single_release,
 282 };
 283
 284 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 285                                                 struct file *file);
 286 static ssize_t acpi_video_device_write_brightness(struct file *file,
 287         const char __user *buffer, size_t count, loff_t *data);
 288 static const struct file_operations acpi_video_device_brightness_fops = {
 289         .owner = THIS_MODULE,
 290         .open = acpi_video_device_brightness_open_fs,
 291         .read = seq_read,
 292         .write = acpi_video_device_write_brightness,
 293         .llseek = seq_lseek,
 294         .release = single_release,
 295 };
 296
 297 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 298                                           struct file *file);
 299 static const struct file_operations acpi_video_device_EDID_fops = {
 300         .owner = THIS_MODULE,
 301         .open = acpi_video_device_EDID_open_fs,
 302         .read = seq_read,
 303         .llseek = seq_lseek,
 304         .release = single_release,
 305 };
 306
 307 static const char device_decode[][30] = {
 308         "motherboard VGA device",
 309         "PCI VGA device",
 310         "AGP VGA device",
 311         "UNKNOWN",
 312 };
 313
 314 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 315 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 316 static void acpi_video_device_bind(struct acpi_video_bus *video,
 317                                    struct acpi_video_device *device);
 318 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 319 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 320                         int level);
 321 static int acpi_video_device_lcd_get_level_current(
 322                         struct acpi_video_device *device,
 323                         unsigned long long *level);
 324 static int acpi_video_get_next_level(struct acpi_video_device *device,
 325                                      u32 level_current, u32 event);
 326 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 327                                          int event);
 328 static int acpi_video_device_get_state(struct acpi_video_device *device,
 329                             unsigned long long *state);
 330 static int acpi_video_output_get(struct output_device *od);
 331 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 332
 333 /*backlight device sysfs support*/
 334 static int acpi_video_get_brightness(struct backlight_device *bd)
 335 {
 336         unsigned long long cur_level;
 337         int i;
 338         struct acpi_video_device *vd =
 339                 (struct acpi_video_device *)bl_get_data(bd);
 340
 341         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 342                 return -EINVAL;
 343         for (i = 2; i < vd->brightness->count; i++) {
 344                 if (vd->brightness->levels[i] == cur_level)
 345                         /* The first two entries are special - see page 575
 346                            of the ACPI spec 3.0 */
 347                         return i-2;
 348         }
 349         return 0;
 350 }
 351
 352 static int acpi_video_set_brightness(struct backlight_device *bd)
 353 {
 354         int request_level = bd->props.brightness + 2;
 355         struct acpi_video_device *vd =
 356                 (struct acpi_video_device *)bl_get_data(bd);
 357
 358         return acpi_video_device_lcd_set_level(vd,
 359                                 vd->brightness->levels[request_level]);
 360 }
 361
 362 static struct backlight_ops acpi_backlight_ops = {
 363         .get_brightness = acpi_video_get_brightness,
 364         .update_status  = acpi_video_set_brightness,
 365 };
 366
 367 /*video output device sysfs support*/
 368 static int acpi_video_output_get(struct output_device *od)
 369 {
 370         unsigned long long state;
 371         struct acpi_video_device *vd =
 372                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 373         acpi_video_device_get_state(vd, &state);
 374         return (int)state;
 375 }
 376
 377 static int acpi_video_output_set(struct output_device *od)
 378 {
 379         unsigned long state = od->request_state;
 380         struct acpi_video_device *vd=
 381                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 382         return acpi_video_device_set_state(vd, state);
 383 }
 384
 385 static struct output_properties acpi_output_properties = {
 386         .set_state = acpi_video_output_set,
 387         .get_status = acpi_video_output_get,
 388 };
 389
 390
 391 /* thermal cooling device callbacks */
 392 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 393                                long *state)
 394 {
 395         struct acpi_device *device = cooling_dev->devdata;
 396         struct acpi_video_device *video = acpi_driver_data(device);
 397
 398         *state = video->brightness->count - 3;
 399         return 0;
 400 }
 401
 402 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 403                                long *state)
 404 {
 405         struct acpi_device *device = cooling_dev->devdata;
 406         struct acpi_video_device *video = acpi_driver_data(device);
 407         unsigned long long level;
 408         int offset;
 409
 410         if (acpi_video_device_lcd_get_level_current(video, &level))
 411                 return -EINVAL;
 412         for (offset = 2; offset < video->brightness->count; offset++)
 413                 if (level == video->brightness->levels[offset]) {
 414                         *state = video->brightness->count - offset - 1;
 415                         return 0;
 416                 }
 417
 418         return -EINVAL;
 419 }
 420
 421 static int
 422 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 423 {
 424         struct acpi_device *device = cooling_dev->devdata;
 425         struct acpi_video_device *video = acpi_driver_data(device);
 426         int level;
 427
 428         if ( state >= video->brightness->count - 2)
 429                 return -EINVAL;
 430
 431         state = video->brightness->count - state;
 432         level = video->brightness->levels[state -1];
 433         return acpi_video_device_lcd_set_level(video, level);
 434 }
 435
 436 static struct thermal_cooling_device_ops video_cooling_ops = {
 437         .get_max_state = video_get_max_state,
 438         .get_cur_state = video_get_cur_state,
 439         .set_cur_state = video_set_cur_state,
 440 };
 441
 442 /* --------------------------------------------------------------------------
 443                                Video Management
 444    -------------------------------------------------------------------------- */
 445
 446 /* device */
 447
 448 static int
 449 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 450 {
 451         int status;
 452
 453         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 454
 455         return status;
 456 }
 457
 458 static int
 459 acpi_video_device_get_state(struct acpi_video_device *device,
 460                             unsigned long long *state)
 461 {
 462         int status;
 463
 464         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 465
 466         return status;
 467 }
 468
 469 static int
 470 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 471 {
 472         int status;
 473         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 474         struct acpi_object_list args = { 1, &arg0 };
 475         unsigned long long ret;
 476
 477
 478         arg0.integer.value = state;
 479         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 480
 481         return status;
 482 }
 483
 484 static int
 485 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 486                                    union acpi_object **levels)
 487 {
 488         int status;
 489         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 490         union acpi_object *obj;
 491
 492
 493         *levels = NULL;
 494
 495         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 496         if (!ACPI_SUCCESS(status))
 497                 return status;
 498         obj = (union acpi_object *)buffer.pointer;
 499         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 500                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 501                 status = -EFAULT;
 502                 goto err;
 503         }
 504
 505         *levels = obj;
 506
 507         return 0;
 508
 509       err:
 510         kfree(buffer.pointer);
 511
 512         return status;
 513 }
 514
 515 static int
 516 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 517 {
 518         int status;
 519         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 520         struct acpi_object_list args = { 1, &arg0 };
 521         int state;
 522
 523         arg0.integer.value = level;
 524
 525         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 526                                       &args, NULL);
 527         if (ACPI_FAILURE(status)) {
 528                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 529                 return -EIO;
 530         }
 531
 532         device->brightness->curr = level;
 533         for (state = 2; state < device->brightness->count; state++)
 534                 if (level == device->brightness->levels[state]) {
 535                         if (device->backlight)
 536                                 device->backlight->props.brightness = state - 2;
 537                         return 0;
 538                 }
 539
 540         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 541         return -EINVAL;
 542 }
 543
 544 /*
 545  * For some buggy _BQC methods, we need to add a constant value to
 546  * the _BQC return value to get the actual current brightness level
 547  */
 548
 549 static int bqc_offset_aml_bug_workaround;
 550 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 551 {
 552         bqc_offset_aml_bug_workaround = 9;
 553         return 0;
 554 }
 555
 556 static struct dmi_system_id video_dmi_table[] __initdata = {
 557         /*
 558          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 559          */
 560         {
 561          .callback = video_set_bqc_offset,
 562          .ident = "Acer Aspire 5720",
 563          .matches = {
 564                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 565                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 566                 },
 567         },
 568         {
 569          .callback = video_set_bqc_offset,
 570          .ident = "Acer Aspire 5710Z",
 571          .matches = {
 572                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 573                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 574                 },
 575         },
 576         {
 577          .callback = video_set_bqc_offset,
 578          .ident = "eMachines E510",
 579          .matches = {
 580                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 582                 },
 583         },
 584         {
 585          .callback = video_set_bqc_offset,
 586          .ident = "Acer Aspire 5315",
 587          .matches = {
 588                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 589                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 590                 },
 591         },
 592         {
 593          .callback = video_set_bqc_offset,
 594          .ident = "Acer Aspire 7720",
 595          .matches = {
 596                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 597                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 598                 },
 599         },
 600         {}
 601 };
 602
 603 static int
 604 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 605                                         unsigned long long *level)
 606 {
 607         acpi_status status = AE_OK;
 608         int i;
 609
 610         if (device->cap._BQC || device->cap._BCQ) {
 611                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 612
 613                 status = acpi_evaluate_integer(device->dev->handle, buf,
 614                                                 NULL, level);
 615                 if (ACPI_SUCCESS(status)) {
 616                         if (device->brightness->flags._BQC_use_index) {
 617                                 if (device->brightness->flags._BCL_reversed)
 618                                         *level = device->brightness->count
 619                                                                  - 3 - (*level);
 620                                 *level = device->brightness->levels[*level + 2];
 621
 622                         }
 623                         *level += bqc_offset_aml_bug_workaround;
 624                         for (i = 2; i < device->brightness->count; i++)
 625                                 if (device->brightness->levels[i] == *level) {
 626                                         device->brightness->curr = *level;
 627                                         return 0;
 628                         }
 629                         /* BQC returned an invalid level. Stop using it.  */
 630                         ACPI_WARNING((AE_INFO, "%s returned an invalid level",
 631                                                 buf));
 632                         device->cap._BQC = device->cap._BCQ = 0;
 633                 } else {
 634                         /* Fixme:
 635                          * should we return an error or ignore this failure?
 636                          * dev->brightness->curr is a cached value which stores
 637                          * the correct current backlight level in most cases.
 638                          * ACPI video backlight still works w/ buggy _BQC.
 639                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 640                          */
 641                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 642                         device->cap._BQC = device->cap._BCQ = 0;
 643                 }
 644         }
 645
 646         *level = device->brightness->curr;
 647         return 0;
 648 }
 649
 650 static int
 651 acpi_video_device_EDID(struct acpi_video_device *device,
 652                        union acpi_object **edid, ssize_t length)
 653 {
 654         int status;
 655         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 656         union acpi_object *obj;
 657         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 658         struct acpi_object_list args = { 1, &arg0 };
 659
 660
 661         *edid = NULL;
 662
 663         if (!device)
 664                 return -ENODEV;
 665         if (length == 128)
 666                 arg0.integer.value = 1;
 667         else if (length == 256)
 668                 arg0.integer.value = 2;
 669         else
 670                 return -EINVAL;
 671
 672         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 673         if (ACPI_FAILURE(status))
 674                 return -ENODEV;
 675
 676         obj = buffer.pointer;
 677
 678         if (obj && obj->type == ACPI_TYPE_BUFFER)
 679                 *edid = obj;
 680         else {
 681                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 682                 status = -EFAULT;
 683                 kfree(obj);
 684         }
 685
 686         return status;
 687 }
 688
 689 /* bus */
 690
 691 static int
 692 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 693 {
 694         int status;
 695         unsigned long long tmp;
 696         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 697         struct acpi_object_list args = { 1, &arg0 };
 698
 699
 700         arg0.integer.value = option;
 701
 702         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 703         if (ACPI_SUCCESS(status))
 704                 status = tmp ? (-EINVAL) : (AE_OK);
 705
 706         return status;
 707 }
 708
 709 static int
 710 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 711 {
 712         int status;
 713
 714         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 715
 716         return status;
 717 }
 718
 719 static int
 720 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 721                             unsigned long long *options)
 722 {
 723         int status;
 724
 725         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 726         *options &= 3;
 727
 728         return status;
 729 }
 730
 731 /*
 732  *  Arg:
 733  *      video           : video bus device pointer
 734  *      bios_flag       :
 735  *              0.      The system BIOS should NOT automatically switch(toggle)
 736  *                      the active display output.
 737  *              1.      The system BIOS should automatically switch (toggle) the
 738  *                      active display output. No switch event.
 739  *              2.      The _DGS value should be locked.
 740  *              3.      The system BIOS should not automatically switch (toggle) the
 741  *                      active display output, but instead generate the display switch
 742  *                      event notify code.
 743  *      lcd_flag        :
 744  *              0.      The system BIOS should automatically control the brightness level
 745  *                      of the LCD when the power changes from AC to DC
 746  *              1.      The system BIOS should NOT automatically control the brightness
 747  *                      level of the LCD when the power changes from AC to DC.
 748  * Return Value:
 749  *              -1      wrong arg.
 750  */
 751
 752 static int
 753 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 754 {
 755         acpi_integer status = 0;
 756         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 757         struct acpi_object_list args = { 1, &arg0 };
 758
 759
 760         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 761                 status = -1;
 762                 goto Failed;
 763         }
 764         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 765         video->dos_setting = arg0.integer.value;
 766         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 767
 768       Failed:
 769         return status;
 770 }
 771
 772 /*
 773  * Simple comparison function used to sort backlight levels.
 774  */
 775
 776 static int
 777 acpi_video_cmp_level(const void *a, const void *b)
 778 {
 779         return *(int *)a - *(int *)b;
 780 }
 781
 782 /*
 783  *  Arg:
 784  *      device  : video output device (LCD, CRT, ..)
 785  *
 786  *  Return Value:
 787  *      Maximum brightness level
 788  *
 789  *  Allocate and initialize device->brightness.
 790  */
 791
 792 static int
 793 acpi_video_init_brightness(struct acpi_video_device *device)
 794 {
 795         union acpi_object *obj = NULL;
 796         int i, max_level = 0, count = 0, level_ac_battery = 0;
 797         unsigned long long level, level_old;
 798         union acpi_object *o;
 799         struct acpi_video_device_brightness *br = NULL;
 800         int result = -EINVAL;
 801
 802         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 803                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 804                                                 "LCD brightness level\n"));
 805                 goto out;
 806         }
 807
 808         if (obj->package.count < 2)
 809                 goto out;
 810
 811         br = kzalloc(sizeof(*br), GFP_KERNEL);
 812         if (!br) {
 813                 printk(KERN_ERR "can't allocate memory\n");
 814                 result = -ENOMEM;
 815                 goto out;
 816         }
 817
 818         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 819                                 GFP_KERNEL);
 820         if (!br->levels) {
 821                 result = -ENOMEM;
 822                 goto out_free;
 823         }
 824
 825         for (i = 0; i < obj->package.count; i++) {
 826                 o = (union acpi_object *)&obj->package.elements[i];
 827                 if (o->type != ACPI_TYPE_INTEGER) {
 828                         printk(KERN_ERR PREFIX "Invalid data\n");
 829                         continue;
 830                 }
 831                 br->levels[count] = (u32) o->integer.value;
 832
 833                 if (br->levels[count] > max_level)
 834                         max_level = br->levels[count];
 835                 count++;
 836         }
 837
 838         /*
 839          * some buggy BIOS don't export the levels
 840          * when machine is on AC/Battery in _BCL package.
 841          * In this case, the first two elements in _BCL packages
 842          * are also supported brightness levels that OS should take care of.
 843          */
 844         for (i = 2; i < count; i++) {
 845                 if (br->levels[i] == br->levels[0])
 846                         level_ac_battery++;
 847                 if (br->levels[i] == br->levels[1])
 848                         level_ac_battery++;
 849         }
 850
 851         if (level_ac_battery < 2) {
 852                 level_ac_battery = 2 - level_ac_battery;
 853                 br->flags._BCL_no_ac_battery_levels = 1;
 854                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 855                         br->levels[i] = br->levels[i - level_ac_battery];
 856                 count += level_ac_battery;
 857         } else if (level_ac_battery > 2)
 858                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 859
 860         /* Check if the _BCL package is in a reversed order */
 861         if (max_level == br->levels[2]) {
 862                 br->flags._BCL_reversed = 1;
 863                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 864                         acpi_video_cmp_level, NULL);
 865         } else if (max_level != br->levels[count - 1])
 866                 ACPI_ERROR((AE_INFO,
 867                             "Found unordered _BCL package\n"));
 868
 869         br->count = count;
 870         device->brightness = br;
 871
 872         /* Check the input/output of _BQC/_BCL/_BCM */
 873         if ((max_level < 100) && (max_level <= (count - 2)))
 874                 br->flags._BCL_use_index = 1;
 875
 876         /*
 877          * _BCM is always consistent with _BCL,
 878          * at least for all the laptops we have ever seen.
 879          */
 880         br->flags._BCM_use_index = br->flags._BCL_use_index;
 881
 882         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 883         br->curr = level = max_level;
 884
 885         if (!device->cap._BQC)
 886                 goto set_level;
 887
 888         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 889         if (result)
 890                 goto out_free_levels;
 891
 892         /*
 893          * Set the level to maximum and check if _BQC uses indexed value
 894          */
 895         result = acpi_video_device_lcd_set_level(device, max_level);
 896         if (result)
 897                 goto out_free_levels;
 898
 899         result = acpi_video_device_lcd_get_level_current(device, &level);
 900         if (result)
 901                 goto out_free_levels;
 902
 903         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 904
 905         if (!br->flags._BQC_use_index) {
 906                 /*
 907                  * Set the backlight to the initial state.
 908                  * On some buggy laptops, _BQC returns an uninitialized value
 909                  * when invoked for the first time, i.e. level_old is invalid.
 910                  * set the backlight to max_level in this case
 911                  */
 912                 for (i = 2; i < br->count; i++)
 913                         if (level_old == br->levels[i])
 914                                 level = level_old;
 915                 goto set_level;
 916         }
 917
 918         if (br->flags._BCL_reversed)
 919                 level_old = (br->count - 1) - level_old;
 920         level = br->levels[level_old];
 921
 922 set_level:
 923         result = acpi_video_device_lcd_set_level(device, level);
 924         if (result)
 925                 goto out_free_levels;
 926
 927         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 928                           "found %d brightness levels\n", count - 2));
 929         kfree(obj);
 930         return result;
 931
 932 out_free_levels:
 933         kfree(br->levels);
 934 out_free:
 935         kfree(br);
 936 out:
 937         device->brightness = NULL;
 938         kfree(obj);
 939         return result;
 940 }
 941
 942 /*
 943  *  Arg:
 944  *      device  : video output device (LCD, CRT, ..)
 945  *
 946  *  Return Value:
 947  *      None
 948  *
 949  *  Find out all required AML methods defined under the output
 950  *  device.
 951  */
 952
 953 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 954 {
 955         acpi_handle h_dummy1;
 956
 957         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 958                 device->cap._ADR = 1;
 959         }
 960         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 961                 device->cap._BCL = 1;
 962         }
 963         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 964                 device->cap._BCM = 1;
 965         }
 966         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 967                 device->cap._BQC = 1;
 968         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 969                                 &h_dummy1))) {
 970                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 971                 device->cap._BCQ = 1;
 972         }
 973
 974         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 975                 device->cap._DDC = 1;
 976         }
 977         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 978                 device->cap._DCS = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 981                 device->cap._DGS = 1;
 982         }
 983         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 984                 device->cap._DSS = 1;
 985         }
 986
 987         if (acpi_video_backlight_support()) {
 988                 int result;
 989                 static int count = 0;
 990                 char *name;
 991
 992                 result = acpi_video_init_brightness(device);
 993                 if (result)
 994                         return;
 995                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 996                 if (!name)
 997                         return;
 998
 999                 sprintf(name, "acpi_video%d", count++);
1000                 device->backlight = backlight_device_register(name,
1001                         NULL, device, &acpi_backlight_ops);
1002                 device->backlight->props.max_brightness = device->brightness->count-3;
1003                 kfree(name);
1004
1005                 result = sysfs_create_link(&device->backlight->dev.kobj,
1006                                            &device->dev->dev.kobj, "device");
1007                 if (result)
1008                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1009
1010                 device->cooling_dev = thermal_cooling_device_register("LCD",
1011                                         device->dev, &video_cooling_ops);
1012                 if (IS_ERR(device->cooling_dev)) {
1013                         /*
1014                          * Set cooling_dev to NULL so we don't crash trying to
1015                          * free it.
1016                          * Also, why the hell we are returning early and
1017                          * not attempt to register video output if cooling
1018                          * device registration failed?
1019                          * -- dtor
1020                          */
1021                         device->cooling_dev = NULL;
1022                         return;
1023                 }
1024
1025                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1026                          device->cooling_dev->id);
1027                 result = sysfs_create_link(&device->dev->dev.kobj,
1028                                 &device->cooling_dev->device.kobj,
1029                                 "thermal_cooling");
1030                 if (result)
1031                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1032                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1033                                 &device->dev->dev.kobj, "device");
1034                 if (result)
1035                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1036
1037         }
1038
1039         if (acpi_video_display_switch_support()) {
1040
1041                 if (device->cap._DCS && device->cap._DSS) {
1042                         static int count;
1043                         char *name;
1044                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1045                         if (!name)
1046                                 return;
1047                         sprintf(name, "acpi_video%d", count++);
1048                         device->output_dev = video_output_register(name,
1049                                         NULL, device, &acpi_output_properties);
1050                         kfree(name);
1051                 }
1052         }
1053 }
1054
1055 /*
1056  *  Arg:
1057  *      device  : video output device (VGA)
1058  *
1059  *  Return Value:
1060  *      None
1061  *
1062  *  Find out all required AML methods defined under the video bus device.
1063  */
1064
1065 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1066 {
1067         acpi_handle h_dummy1;
1068
1069         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1070                 video->cap._DOS = 1;
1071         }
1072         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1073                 video->cap._DOD = 1;
1074         }
1075         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1076                 video->cap._ROM = 1;
1077         }
1078         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1079                 video->cap._GPD = 1;
1080         }
1081         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1082                 video->cap._SPD = 1;
1083         }
1084         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1085                 video->cap._VPO = 1;
1086         }
1087 }
1088
1089 /*
1090  * Check whether the video bus device has required AML method to
1091  * support the desired features
1092  */
1093
1094 static int acpi_video_bus_check(struct acpi_video_bus *video)
1095 {
1096         acpi_status status = -ENOENT;
1097         struct pci_dev *dev;
1098
1099         if (!video)
1100                 return -EINVAL;
1101
1102         dev = acpi_get_pci_dev(video->device->handle);
1103         if (!dev)
1104                 return -ENODEV;
1105         pci_dev_put(dev);
1106
1107         /* Since there is no HID, CID and so on for VGA driver, we have
1108          * to check well known required nodes.
1109          */
1110
1111         /* Does this device support video switching? */
1112         if (video->cap._DOS || video->cap._DOD) {
1113                 if (!video->cap._DOS) {
1114                         printk(KERN_WARNING FW_BUG
1115                                 "ACPI(%s) defines _DOD but not _DOS\n",
1116                                 acpi_device_bid(video->device));
1117                 }
1118                 video->flags.multihead = 1;
1119                 status = 0;
1120         }
1121
1122         /* Does this device support retrieving a video ROM? */
1123         if (video->cap._ROM) {
1124                 video->flags.rom = 1;
1125                 status = 0;
1126         }
1127
1128         /* Does this device support configuring which video device to POST? */
1129         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1130                 video->flags.post = 1;
1131                 status = 0;
1132         }
1133
1134         return status;
1135 }
1136
1137 /* --------------------------------------------------------------------------
1138                               FS Interface (/proc)
1139    -------------------------------------------------------------------------- */
1140
1141 static struct proc_dir_entry *acpi_video_dir;
1142
1143 /* video devices */
1144
1145 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1146 {
1147         struct acpi_video_device *dev = seq->private;
1148
1149
1150         if (!dev)
1151                 goto end;
1152
1153         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1154         seq_printf(seq, "type:         ");
1155         if (dev->flags.crt)
1156                 seq_printf(seq, "CRT\n");
1157         else if (dev->flags.lcd)
1158                 seq_printf(seq, "LCD\n");
1159         else if (dev->flags.tvout)
1160                 seq_printf(seq, "TVOUT\n");
1161         else if (dev->flags.dvi)
1162                 seq_printf(seq, "DVI\n");
1163         else
1164                 seq_printf(seq, "UNKNOWN\n");
1165
1166         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1167
1168       end:
1169         return 0;
1170 }
1171
1172 static int
1173 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1174 {
1175         return single_open(file, acpi_video_device_info_seq_show,
1176                            PDE(inode)->data);
1177 }
1178
1179 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1180 {
1181         int status;
1182         struct acpi_video_device *dev = seq->private;
1183         unsigned long long state;
1184
1185
1186         if (!dev)
1187                 goto end;
1188
1189         status = acpi_video_device_get_state(dev, &state);
1190         seq_printf(seq, "state:     ");
1191         if (ACPI_SUCCESS(status))
1192                 seq_printf(seq, "0x%02llx\n", state);
1193         else
1194                 seq_printf(seq, "<not supported>\n");
1195
1196         status = acpi_video_device_query(dev, &state);
1197         seq_printf(seq, "query:     ");
1198         if (ACPI_SUCCESS(status))
1199                 seq_printf(seq, "0x%02llx\n", state);
1200         else
1201                 seq_printf(seq, "<not supported>\n");
1202
1203       end:
1204         return 0;
1205 }
1206
1207 static int
1208 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1209 {
1210         return single_open(file, acpi_video_device_state_seq_show,
1211                            PDE(inode)->data);
1212 }
1213
1214 static ssize_t
1215 acpi_video_device_write_state(struct file *file,
1216                               const char __user * buffer,
1217                               size_t count, loff_t * data)
1218 {
1219         int status;
1220         struct seq_file *m = file->private_data;
1221         struct acpi_video_device *dev = m->private;
1222         char str[12] = { 0 };
1223         u32 state = 0;
1224
1225
1226         if (!dev || count >= sizeof(str))
1227                 return -EINVAL;
1228
1229         if (copy_from_user(str, buffer, count))
1230                 return -EFAULT;
1231
1232         str[count] = 0;
1233         state = simple_strtoul(str, NULL, 0);
1234         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1235
1236         status = acpi_video_device_set_state(dev, state);
1237
1238         if (status)
1239                 return -EFAULT;
1240
1241         return count;
1242 }
1243
1244 static int
1245 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1246 {
1247         struct acpi_video_device *dev = seq->private;
1248         int i;
1249
1250
1251         if (!dev || !dev->brightness) {
1252                 seq_printf(seq, "<not supported>\n");
1253                 return 0;
1254         }
1255
1256         seq_printf(seq, "levels: ");
1257         for (i = 2; i < dev->brightness->count; i++)
1258                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1259         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1260
1261         return 0;
1262 }
1263
1264 static int
1265 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1266 {
1267         return single_open(file, acpi_video_device_brightness_seq_show,
1268                            PDE(inode)->data);
1269 }
1270
1271 static ssize_t
1272 acpi_video_device_write_brightness(struct file *file,
1273                                    const char __user * buffer,
1274                                    size_t count, loff_t * data)
1275 {
1276         struct seq_file *m = file->private_data;
1277         struct acpi_video_device *dev = m->private;
1278         char str[5] = { 0 };
1279         unsigned int level = 0;
1280         int i;
1281
1282
1283         if (!dev || !dev->brightness || count >= sizeof(str))
1284                 return -EINVAL;
1285
1286         if (copy_from_user(str, buffer, count))
1287                 return -EFAULT;
1288
1289         str[count] = 0;
1290         level = simple_strtoul(str, NULL, 0);
1291
1292         if (level > 100)
1293                 return -EFAULT;
1294
1295         /* validate through the list of available levels */
1296         for (i = 2; i < dev->brightness->count; i++)
1297                 if (level == dev->brightness->levels[i]) {
1298                         if (!acpi_video_device_lcd_set_level(dev, level))
1299                                 return count;
1300                         break;
1301                 }
1302
1303         return -EINVAL;
1304 }
1305
1306 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1307 {
1308         struct acpi_video_device *dev = seq->private;
1309         int status;
1310         int i;
1311         union acpi_object *edid = NULL;
1312
1313
1314         if (!dev)
1315                 goto out;
1316
1317         status = acpi_video_device_EDID(dev, &edid, 128);
1318         if (ACPI_FAILURE(status)) {
1319                 status = acpi_video_device_EDID(dev, &edid, 256);
1320         }
1321
1322         if (ACPI_FAILURE(status)) {
1323                 goto out;
1324         }
1325
1326         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1327                 for (i = 0; i < edid->buffer.length; i++)
1328                         seq_putc(seq, edid->buffer.pointer[i]);
1329         }
1330
1331       out:
1332         if (!edid)
1333                 seq_printf(seq, "<not supported>\n");
1334         else
1335                 kfree(edid);
1336
1337         return 0;
1338 }
1339
1340 static int
1341 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1342 {
1343         return single_open(file, acpi_video_device_EDID_seq_show,
1344                            PDE(inode)->data);
1345 }
1346
1347 static int acpi_video_device_add_fs(struct acpi_device *device)
1348 {
1349         struct proc_dir_entry *entry, *device_dir;
1350         struct acpi_video_device *vid_dev;
1351
1352         vid_dev = acpi_driver_data(device);
1353         if (!vid_dev)
1354                 return -ENODEV;
1355
1356         device_dir = proc_mkdir(acpi_device_bid(device),
1357                                 vid_dev->video->dir);
1358         if (!device_dir)
1359                 return -ENOMEM;
1360
1361         /* 'info' [R] */
1362         entry = proc_create_data("info", S_IRUGO, device_dir,
1363                         &acpi_video_device_info_fops, acpi_driver_data(device));
1364         if (!entry)
1365                 goto err_remove_dir;
1366
1367         /* 'state' [R/W] */
1368         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1369                                  device_dir,
1370                                  &acpi_video_device_state_fops,
1371                                  acpi_driver_data(device));
1372         if (!entry)
1373                 goto err_remove_info;
1374
1375         /* 'brightness' [R/W] */
1376         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1377                                  device_dir,
1378                                  &acpi_video_device_brightness_fops,
1379                                  acpi_driver_data(device));
1380         if (!entry)
1381                 goto err_remove_state;
1382
1383         /* 'EDID' [R] */
1384         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1385                                  &acpi_video_device_EDID_fops,
1386                                  acpi_driver_data(device));
1387         if (!entry)
1388                 goto err_remove_brightness;
1389
1390         acpi_device_dir(device) = device_dir;
1391
1392         return 0;
1393
1394  err_remove_brightness:
1395         remove_proc_entry("brightness", device_dir);
1396  err_remove_state:
1397         remove_proc_entry("state", device_dir);
1398  err_remove_info:
1399         remove_proc_entry("info", device_dir);
1400  err_remove_dir:
1401         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1402         return -ENOMEM;
1403 }
1404
1405 static int acpi_video_device_remove_fs(struct acpi_device *device)
1406 {
1407         struct acpi_video_device *vid_dev;
1408         struct proc_dir_entry *device_dir;
1409
1410         vid_dev = acpi_driver_data(device);
1411         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1412                 return -ENODEV;
1413
1414         device_dir = acpi_device_dir(device);
1415         if (device_dir) {
1416                 remove_proc_entry("info", device_dir);
1417                 remove_proc_entry("state", device_dir);
1418                 remove_proc_entry("brightness", device_dir);
1419                 remove_proc_entry("EDID", device_dir);
1420                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1421                 acpi_device_dir(device) = NULL;
1422         }
1423
1424         return 0;
1425 }
1426
1427 /* video bus */
1428 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1429 {
1430         struct acpi_video_bus *video = seq->private;
1431
1432
1433         if (!video)
1434                 goto end;
1435
1436         seq_printf(seq, "Switching heads:              %s\n",
1437                    video->flags.multihead ? "yes" : "no");
1438         seq_printf(seq, "Video ROM:                    %s\n",
1439                    video->flags.rom ? "yes" : "no");
1440         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1441                    video->flags.post ? "yes" : "no");
1442
1443       end:
1444         return 0;
1445 }
1446
1447 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1448 {
1449         return single_open(file, acpi_video_bus_info_seq_show,
1450                            PDE(inode)->data);
1451 }
1452
1453 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1454 {
1455         struct acpi_video_bus *video = seq->private;
1456
1457
1458         if (!video)
1459                 goto end;
1460
1461         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1462         seq_printf(seq, "<TODO>\n");
1463
1464       end:
1465         return 0;
1466 }
1467
1468 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1469 {
1470         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1471 }
1472
1473 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1474 {
1475         struct acpi_video_bus *video = seq->private;
1476         unsigned long long options;
1477         int status;
1478
1479
1480         if (!video)
1481                 goto end;
1482
1483         status = acpi_video_bus_POST_options(video, &options);
1484         if (ACPI_SUCCESS(status)) {
1485                 if (!(options & 1)) {
1486                         printk(KERN_WARNING PREFIX
1487                                "The motherboard VGA device is not listed as a possible POST device.\n");
1488                         printk(KERN_WARNING PREFIX
1489                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1490                 }
1491                 printk(KERN_WARNING "%llx\n", options);
1492                 seq_printf(seq, "can POST: <integrated video>");
1493                 if (options & 2)
1494                         seq_printf(seq, " <PCI video>");
1495                 if (options & 4)
1496                         seq_printf(seq, " <AGP video>");
1497                 seq_putc(seq, '\n');
1498         } else
1499                 seq_printf(seq, "<not supported>\n");
1500       end:
1501         return 0;
1502 }
1503
1504 static int
1505 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1506 {
1507         return single_open(file, acpi_video_bus_POST_info_seq_show,
1508                            PDE(inode)->data);
1509 }
1510
1511 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1512 {
1513         struct acpi_video_bus *video = seq->private;
1514         int status;
1515         unsigned long long id;
1516
1517
1518         if (!video)
1519                 goto end;
1520
1521         status = acpi_video_bus_get_POST(video, &id);
1522         if (!ACPI_SUCCESS(status)) {
1523                 seq_printf(seq, "<not supported>\n");
1524                 goto end;
1525         }
1526         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1527
1528       end:
1529         return 0;
1530 }
1531
1532 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1533 {
1534         struct acpi_video_bus *video = seq->private;
1535
1536
1537         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1538
1539         return 0;
1540 }
1541
1542 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1543 {
1544         return single_open(file, acpi_video_bus_POST_seq_show,
1545                            PDE(inode)->data);
1546 }
1547
1548 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1549 {
1550         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1551 }
1552
1553 static ssize_t
1554 acpi_video_bus_write_POST(struct file *file,
1555                           const char __user * buffer,
1556                           size_t count, loff_t * data)
1557 {
1558         int status;
1559         struct seq_file *m = file->private_data;
1560         struct acpi_video_bus *video = m->private;
1561         char str[12] = { 0 };
1562         unsigned long long opt, options;
1563
1564
1565         if (!video || count >= sizeof(str))
1566                 return -EINVAL;
1567
1568         status = acpi_video_bus_POST_options(video, &options);
1569         if (!ACPI_SUCCESS(status))
1570                 return -EINVAL;
1571
1572         if (copy_from_user(str, buffer, count))
1573                 return -EFAULT;
1574
1575         str[count] = 0;
1576         opt = strtoul(str, NULL, 0);
1577         if (opt > 3)
1578                 return -EFAULT;
1579
1580         /* just in case an OEM 'forgot' the motherboard... */
1581         options |= 1;
1582
1583         if (options & (1ul << opt)) {
1584                 status = acpi_video_bus_set_POST(video, opt);
1585                 if (!ACPI_SUCCESS(status))
1586                         return -EFAULT;
1587
1588         }
1589
1590         return count;
1591 }
1592
1593 static ssize_t
1594 acpi_video_bus_write_DOS(struct file *file,
1595                          const char __user * buffer,
1596                          size_t count, loff_t * data)
1597 {
1598         int status;
1599         struct seq_file *m = file->private_data;
1600         struct acpi_video_bus *video = m->private;
1601         char str[12] = { 0 };
1602         unsigned long opt;
1603
1604
1605         if (!video || count >= sizeof(str))
1606                 return -EINVAL;
1607
1608         if (copy_from_user(str, buffer, count))
1609                 return -EFAULT;
1610
1611         str[count] = 0;
1612         opt = strtoul(str, NULL, 0);
1613         if (opt > 7)
1614                 return -EFAULT;
1615
1616         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1617
1618         if (!ACPI_SUCCESS(status))
1619                 return -EFAULT;
1620
1621         return count;
1622 }
1623
1624 static int acpi_video_bus_add_fs(struct acpi_device *device)
1625 {
1626         struct acpi_video_bus *video = acpi_driver_data(device);
1627         struct proc_dir_entry *device_dir;
1628         struct proc_dir_entry *entry;
1629
1630         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1631         if (!device_dir)
1632                 return -ENOMEM;
1633
1634         /* 'info' [R] */
1635         entry = proc_create_data("info", S_IRUGO, device_dir,
1636                                  &acpi_video_bus_info_fops,
1637                                  acpi_driver_data(device));
1638         if (!entry)
1639                 goto err_remove_dir;
1640
1641         /* 'ROM' [R] */
1642         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1643                                  &acpi_video_bus_ROM_fops,
1644                                  acpi_driver_data(device));
1645         if (!entry)
1646                 goto err_remove_info;
1647
1648         /* 'POST_info' [R] */
1649         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1650                                  &acpi_video_bus_POST_info_fops,
1651                                  acpi_driver_data(device));
1652         if (!entry)
1653                 goto err_remove_rom;
1654
1655         /* 'POST' [R/W] */
1656         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1657                                  device_dir,
1658                                  &acpi_video_bus_POST_fops,
1659                                  acpi_driver_data(device));
1660         if (!entry)
1661                 goto err_remove_post_info;
1662
1663         /* 'DOS' [R/W] */
1664         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1665                                  device_dir,
1666                                  &acpi_video_bus_DOS_fops,
1667                                  acpi_driver_data(device));
1668         if (!entry)
1669                 goto err_remove_post;
1670
1671         video->dir = acpi_device_dir(device) = device_dir;
1672         return 0;
1673
1674  err_remove_post:
1675         remove_proc_entry("POST", device_dir);
1676  err_remove_post_info:
1677         remove_proc_entry("POST_info", device_dir);
1678  err_remove_rom:
1679         remove_proc_entry("ROM", device_dir);
1680  err_remove_info:
1681         remove_proc_entry("info", device_dir);
1682  err_remove_dir:
1683         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1684         return -ENOMEM;
1685 }
1686
1687 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1688 {
1689         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1690
1691         if (device_dir) {
1692                 remove_proc_entry("info", device_dir);
1693                 remove_proc_entry("ROM", device_dir);
1694                 remove_proc_entry("POST_info", device_dir);
1695                 remove_proc_entry("POST", device_dir);
1696                 remove_proc_entry("DOS", device_dir);
1697                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1698                 acpi_device_dir(device) = NULL;
1699         }
1700
1701         return 0;
1702 }
1703
1704 /* --------------------------------------------------------------------------
1705                                  Driver Interface
1706    -------------------------------------------------------------------------- */
1707
1708 /* device interface */
1709 static struct acpi_video_device_attrib*
1710 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1711 {
1712         struct acpi_video_enumerated_device *ids;
1713         int i;
1714
1715         for (i = 0; i < video->attached_count; i++) {
1716                 ids = &video->attached_array[i];
1717                 if ((ids->value.int_val & 0xffff) == device_id)
1718                         return &ids->value.attrib;
1719         }
1720
1721         return NULL;
1722 }
1723
1724 static int
1725 acpi_video_bus_get_one_device(struct acpi_device *device,
1726                               struct acpi_video_bus *video)
1727 {
1728         unsigned long long device_id;
1729         int status;
1730         struct acpi_video_device *data;
1731         struct acpi_video_device_attrib* attribute;
1732
1733         if (!device || !video)
1734                 return -EINVAL;
1735
1736         status =
1737             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1738         if (ACPI_SUCCESS(status)) {
1739
1740                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1741                 if (!data)
1742                         return -ENOMEM;
1743
1744                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1745                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1746                 device->driver_data = data;
1747
1748                 data->device_id = device_id;
1749                 data->video = video;
1750                 data->dev = device;
1751
1752                 attribute = acpi_video_get_device_attr(video, device_id);
1753
1754                 if((attribute != NULL) && attribute->device_id_scheme) {
1755                         switch (attribute->display_type) {
1756                         case ACPI_VIDEO_DISPLAY_CRT:
1757                                 data->flags.crt = 1;
1758                                 break;
1759                         case ACPI_VIDEO_DISPLAY_TV:
1760                                 data->flags.tvout = 1;
1761                                 break;
1762                         case ACPI_VIDEO_DISPLAY_DVI:
1763                                 data->flags.dvi = 1;
1764                                 break;
1765                         case ACPI_VIDEO_DISPLAY_LCD:
1766                                 data->flags.lcd = 1;
1767                                 break;
1768                         default:
1769                                 data->flags.unknown = 1;
1770                                 break;
1771                         }
1772                         if(attribute->bios_can_detect)
1773                                 data->flags.bios = 1;
1774                 } else
1775                         data->flags.unknown = 1;
1776
1777                 acpi_video_device_bind(video, data);
1778                 acpi_video_device_find_cap(data);
1779
1780                 status = acpi_install_notify_handler(device->handle,
1781                                                      ACPI_DEVICE_NOTIFY,
1782                                                      acpi_video_device_notify,
1783                                                      data);
1784                 if (ACPI_FAILURE(status)) {
1785                         printk(KERN_ERR PREFIX
1786                                           "Error installing notify handler\n");
1787                         if(data->brightness)
1788                                 kfree(data->brightness->levels);
1789                         kfree(data->brightness);
1790                         kfree(data);
1791                         return -ENODEV;
1792                 }
1793
1794                 mutex_lock(&video->device_list_lock);
1795                 list_add_tail(&data->entry, &video->video_device_list);
1796                 mutex_unlock(&video->device_list_lock);
1797
1798                 acpi_video_device_add_fs(device);
1799
1800                 return 0;
1801         }
1802
1803         return -ENOENT;
1804 }
1805
1806 /*
1807  *  Arg:
1808  *      video   : video bus device
1809  *
1810  *  Return:
1811  *      none
1812  *
1813  *  Enumerate the video device list of the video bus,
1814  *  bind the ids with the corresponding video devices
1815  *  under the video bus.
1816  */
1817
1818 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1819 {
1820         struct acpi_video_device *dev;
1821
1822         mutex_lock(&video->device_list_lock);
1823
1824         list_for_each_entry(dev, &video->video_device_list, entry)
1825                 acpi_video_device_bind(video, dev);
1826
1827         mutex_unlock(&video->device_list_lock);
1828 }
1829
1830 /*
1831  *  Arg:
1832  *      video   : video bus device
1833  *      device  : video output device under the video
1834  *              bus
1835  *
1836  *  Return:
1837  *      none
1838  *
1839  *  Bind the ids with the corresponding video devices
1840  *  under the video bus.
1841  */
1842
1843 static void
1844 acpi_video_device_bind(struct acpi_video_bus *video,
1845                        struct acpi_video_device *device)
1846 {
1847         struct acpi_video_enumerated_device *ids;
1848         int i;
1849
1850         for (i = 0; i < video->attached_count; i++) {
1851                 ids = &video->attached_array[i];
1852                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1853                         ids->bind_info = device;
1854                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1855                 }
1856         }
1857 }
1858
1859 /*
1860  *  Arg:
1861  *      video   : video bus device
1862  *
1863  *  Return:
1864  *      < 0     : error
1865  *
1866  *  Call _DOD to enumerate all devices attached to display adapter
1867  *
1868  */
1869
1870 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1871 {
1872         int status;
1873         int count;
1874         int i;
1875         struct acpi_video_enumerated_device *active_list;
1876         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1877         union acpi_object *dod = NULL;
1878         union acpi_object *obj;
1879
1880         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1881         if (!ACPI_SUCCESS(status)) {
1882                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1883                 return status;
1884         }
1885
1886         dod = buffer.pointer;
1887         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1888                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1889                 status = -EFAULT;
1890                 goto out;
1891         }
1892
1893         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1894                           dod->package.count));
1895
1896         active_list = kcalloc(1 + dod->package.count,
1897                               sizeof(struct acpi_video_enumerated_device),
1898                               GFP_KERNEL);
1899         if (!active_list) {
1900                 status = -ENOMEM;
1901                 goto out;
1902         }
1903
1904         count = 0;
1905         for (i = 0; i < dod->package.count; i++) {
1906                 obj = &dod->package.elements[i];
1907
1908                 if (obj->type != ACPI_TYPE_INTEGER) {
1909                         printk(KERN_ERR PREFIX
1910                                 "Invalid _DOD data in element %d\n", i);
1911                         continue;
1912                 }
1913
1914                 active_list[count].value.int_val = obj->integer.value;
1915                 active_list[count].bind_info = NULL;
1916                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1917                                   (int)obj->integer.value));
1918                 count++;
1919         }
1920
1921         kfree(video->attached_array);
1922
1923         video->attached_array = active_list;
1924         video->attached_count = count;
1925
1926  out:
1927         kfree(buffer.pointer);
1928         return status;
1929 }
1930
1931 static int
1932 acpi_video_get_next_level(struct acpi_video_device *device,
1933                           u32 level_current, u32 event)
1934 {
1935         int min, max, min_above, max_below, i, l, delta = 255;
1936         max = max_below = 0;
1937         min = min_above = 255;
1938         /* Find closest level to level_current */
1939         for (i = 2; i < device->brightness->count; i++) {
1940                 l = device->brightness->levels[i];
1941                 if (abs(l - level_current) < abs(delta)) {
1942                         delta = l - level_current;
1943                         if (!delta)
1944                                 break;
1945                 }
1946         }
1947         /* Ajust level_current to closest available level */
1948         level_current += delta;
1949         for (i = 2; i < device->brightness->count; i++) {
1950                 l = device->brightness->levels[i];
1951                 if (l < min)
1952                         min = l;
1953                 if (l > max)
1954                         max = l;
1955                 if (l < min_above && l > level_current)
1956                         min_above = l;
1957                 if (l > max_below && l < level_current)
1958                         max_below = l;
1959         }
1960
1961         switch (event) {
1962         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1963                 return (level_current < max) ? min_above : min;
1964         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1965                 return (level_current < max) ? min_above : max;
1966         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1967                 return (level_current > min) ? max_below : min;
1968         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1969         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1970                 return 0;
1971         default:
1972                 return level_current;
1973         }
1974 }
1975
1976 static int
1977 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1978 {
1979         unsigned long long level_current, level_next;
1980         int result = -EINVAL;
1981
1982         if (!device->brightness)
1983                 goto out;
1984
1985         result = acpi_video_device_lcd_get_level_current(device,
1986                                                          &level_current);
1987         if (result)
1988                 goto out;
1989
1990         level_next = acpi_video_get_next_level(device, level_current, event);
1991
1992         result = acpi_video_device_lcd_set_level(device, level_next);
1993
1994         if (!result)
1995                 backlight_force_update(device->backlight,
1996                                        BACKLIGHT_UPDATE_HOTKEY);
1997
1998 out:
1999         if (result)
2000                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2001
2002         return result;
2003 }
2004
2005 static int
2006 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2007                            struct acpi_device *device)
2008 {
2009         int status = 0;
2010         struct acpi_device *dev;
2011
2012         acpi_video_device_enumerate(video);
2013
2014         list_for_each_entry(dev, &device->children, node) {
2015
2016                 status = acpi_video_bus_get_one_device(dev, video);
2017                 if (ACPI_FAILURE(status)) {
2018                         printk(KERN_WARNING PREFIX
2019                                         "Cant attach device");
2020                         continue;
2021                 }
2022         }
2023         return status;
2024 }
2025
2026 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2027 {
2028         acpi_status status;
2029         struct acpi_video_bus *video;
2030
2031
2032         if (!device || !device->video)
2033                 return -ENOENT;
2034
2035         video = device->video;
2036
2037         acpi_video_device_remove_fs(device->dev);
2038
2039         status = acpi_remove_notify_handler(device->dev->handle,
2040                                             ACPI_DEVICE_NOTIFY,
2041                                             acpi_video_device_notify);
2042         if (device->backlight) {
2043                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2044                 backlight_device_unregister(device->backlight);
2045                 device->backlight = NULL;
2046         }
2047         if (device->cooling_dev) {
2048                 sysfs_remove_link(&device->dev->dev.kobj,
2049                                   "thermal_cooling");
2050                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2051                                   "device");
2052                 thermal_cooling_device_unregister(device->cooling_dev);
2053                 device->cooling_dev = NULL;
2054         }
2055         video_output_unregister(device->output_dev);
2056
2057         return 0;
2058 }
2059
2060 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2061 {
2062         int status;
2063         struct acpi_video_device *dev, *next;
2064
2065         mutex_lock(&video->device_list_lock);
2066
2067         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2068
2069                 status = acpi_video_bus_put_one_device(dev);
2070                 if (ACPI_FAILURE(status))
2071                         printk(KERN_WARNING PREFIX
2072                                "hhuuhhuu bug in acpi video driver.\n");
2073
2074                 if (dev->brightness) {
2075                         kfree(dev->brightness->levels);
2076                         kfree(dev->brightness);
2077                 }
2078                 list_del(&dev->entry);
2079                 kfree(dev);
2080         }
2081
2082         mutex_unlock(&video->device_list_lock);
2083
2084         return 0;
2085 }
2086
2087 /* acpi_video interface */
2088
2089 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2090 {
2091         return acpi_video_bus_DOS(video, 0, 0);
2092 }
2093
2094 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2095 {
2096         return acpi_video_bus_DOS(video, 0, 1);
2097 }
2098
2099 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2100 {
2101         struct acpi_video_bus *video = acpi_driver_data(device);
2102         struct input_dev *input;
2103         int keycode;
2104
2105         if (!video)
2106                 return;
2107
2108         input = video->input;
2109
2110         switch (event) {
2111         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2112                                          * most likely via hotkey. */
2113                 acpi_bus_generate_proc_event(device, event, 0);
2114                 keycode = KEY_SWITCHVIDEOMODE;
2115                 break;
2116
2117         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2118                                          * connector. */
2119                 acpi_video_device_enumerate(video);
2120                 acpi_video_device_rebind(video);
2121                 acpi_bus_generate_proc_event(device, event, 0);
2122                 keycode = KEY_SWITCHVIDEOMODE;
2123                 break;
2124
2125         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2126                 acpi_bus_generate_proc_event(device, event, 0);
2127                 keycode = KEY_SWITCHVIDEOMODE;
2128                 break;
2129         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2130                 acpi_bus_generate_proc_event(device, event, 0);
2131                 keycode = KEY_VIDEO_NEXT;
2132                 break;
2133         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2134                 acpi_bus_generate_proc_event(device, event, 0);
2135                 keycode = KEY_VIDEO_PREV;
2136                 break;
2137
2138         default:
2139                 keycode = KEY_UNKNOWN;
2140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2141                                   "Unsupported event [0x%x]\n", event));
2142                 break;
2143         }
2144
2145         acpi_notifier_call_chain(device, event, 0);
2146         input_report_key(input, keycode, 1);
2147         input_sync(input);
2148         input_report_key(input, keycode, 0);
2149         input_sync(input);
2150
2151         return;
2152 }
2153
2154 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2155 {
2156         struct acpi_video_device *video_device = data;
2157         struct acpi_device *device = NULL;
2158         struct acpi_video_bus *bus;
2159         struct input_dev *input;
2160         int keycode;
2161
2162         if (!video_device)
2163                 return;
2164
2165         device = video_device->dev;
2166         bus = video_device->video;
2167         input = bus->input;
2168
2169         switch (event) {
2170         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
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_BRIGHTNESS_CYCLE;
2175                 break;
2176         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2177                 if (brightness_switch_enabled)
2178                         acpi_video_switch_brightness(video_device, event);
2179                 acpi_bus_generate_proc_event(device, event, 0);
2180                 keycode = KEY_BRIGHTNESSUP;
2181                 break;
2182         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2183                 if (brightness_switch_enabled)
2184                         acpi_video_switch_brightness(video_device, event);
2185                 acpi_bus_generate_proc_event(device, event, 0);
2186                 keycode = KEY_BRIGHTNESSDOWN;
2187                 break;
2188         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2189                 if (brightness_switch_enabled)
2190                         acpi_video_switch_brightness(video_device, event);
2191                 acpi_bus_generate_proc_event(device, event, 0);
2192                 keycode = KEY_BRIGHTNESS_ZERO;
2193                 break;
2194         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2195                 if (brightness_switch_enabled)
2196                         acpi_video_switch_brightness(video_device, event);
2197                 acpi_bus_generate_proc_event(device, event, 0);
2198                 keycode = KEY_DISPLAY_OFF;
2199                 break;
2200         default:
2201                 keycode = KEY_UNKNOWN;
2202                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2203                                   "Unsupported event [0x%x]\n", event));
2204                 break;
2205         }
2206
2207         acpi_notifier_call_chain(device, event, 0);
2208         input_report_key(input, keycode, 1);
2209         input_sync(input);
2210         input_report_key(input, keycode, 0);
2211         input_sync(input);
2212
2213         return;
2214 }
2215
2216 static int instance;
2217 static int acpi_video_resume(struct acpi_device *device)
2218 {
2219         struct acpi_video_bus *video;
2220         struct acpi_video_device *video_device;
2221         int i;
2222
2223         if (!device || !acpi_driver_data(device))
2224                 return -EINVAL;
2225
2226         video = acpi_driver_data(device);
2227
2228         for (i = 0; i < video->attached_count; i++) {
2229                 video_device = video->attached_array[i].bind_info;
2230                 if (video_device && video_device->backlight)
2231                         acpi_video_set_brightness(video_device->backlight);
2232         }
2233         return AE_OK;
2234 }
2235
2236 static int acpi_video_bus_add(struct acpi_device *device)
2237 {
2238         struct acpi_video_bus *video;
2239         struct input_dev *input;
2240         int error;
2241
2242         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2243         if (!video)
2244                 return -ENOMEM;
2245
2246         /* a hack to fix the duplicate name "VID" problem on T61 */
2247         if (!strcmp(device->pnp.bus_id, "VID")) {
2248                 if (instance)
2249                         device->pnp.bus_id[3] = '0' + instance;
2250                 instance ++;
2251         }
2252         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2253         if (!strcmp(device->pnp.bus_id, "VGA")) {
2254                 if (instance)
2255                         device->pnp.bus_id[3] = '0' + instance;
2256                 instance++;
2257         }
2258
2259         video->device = device;
2260         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2261         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2262         device->driver_data = video;
2263
2264         acpi_video_bus_find_cap(video);
2265         error = acpi_video_bus_check(video);
2266         if (error)
2267                 goto err_free_video;
2268
2269         error = acpi_video_bus_add_fs(device);
2270         if (error)
2271                 goto err_free_video;
2272
2273         mutex_init(&video->device_list_lock);
2274         INIT_LIST_HEAD(&video->video_device_list);
2275
2276         acpi_video_bus_get_devices(video, device);
2277         acpi_video_bus_start_devices(video);
2278
2279         video->input = input = input_allocate_device();
2280         if (!input) {
2281                 error = -ENOMEM;
2282                 goto err_stop_video;
2283         }
2284
2285         snprintf(video->phys, sizeof(video->phys),
2286                 "%s/video/input0", acpi_device_hid(video->device));
2287
2288         input->name = acpi_device_name(video->device);
2289         input->phys = video->phys;
2290         input->id.bustype = BUS_HOST;
2291         input->id.product = 0x06;
2292         input->dev.parent = &device->dev;
2293         input->evbit[0] = BIT(EV_KEY);
2294         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2295         set_bit(KEY_VIDEO_NEXT, input->keybit);
2296         set_bit(KEY_VIDEO_PREV, input->keybit);
2297         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2298         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2299         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2300         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2301         set_bit(KEY_DISPLAY_OFF, input->keybit);
2302         set_bit(KEY_UNKNOWN, input->keybit);
2303
2304         error = input_register_device(input);
2305         if (error)
2306                 goto err_free_input_dev;
2307
2308         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2309                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2310                video->flags.multihead ? "yes" : "no",
2311                video->flags.rom ? "yes" : "no",
2312                video->flags.post ? "yes" : "no");
2313
2314         return 0;
2315
2316  err_free_input_dev:
2317         input_free_device(input);
2318  err_stop_video:
2319         acpi_video_bus_stop_devices(video);
2320         acpi_video_bus_put_devices(video);
2321         kfree(video->attached_array);
2322         acpi_video_bus_remove_fs(device);
2323  err_free_video:
2324         kfree(video);
2325         device->driver_data = NULL;
2326
2327         return error;
2328 }
2329
2330 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2331 {
2332         struct acpi_video_bus *video = NULL;
2333
2334
2335         if (!device || !acpi_driver_data(device))
2336                 return -EINVAL;
2337
2338         video = acpi_driver_data(device);
2339
2340         acpi_video_bus_stop_devices(video);
2341         acpi_video_bus_put_devices(video);
2342         acpi_video_bus_remove_fs(device);
2343
2344         input_unregister_device(video->input);
2345         kfree(video->attached_array);
2346         kfree(video);
2347
2348         return 0;
2349 }
2350
2351 static int __init intel_opregion_present(void)
2352 {
2353 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2354         struct pci_dev *dev = NULL;
2355         u32 address;
2356
2357         for_each_pci_dev(dev) {
2358                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2359                         continue;
2360                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2361                         continue;
2362                 pci_read_config_dword(dev, 0xfc, &address);
2363                 if (!address)
2364                         continue;
2365                 return 1;
2366         }
2367 #endif
2368         return 0;
2369 }
2370
2371 int acpi_video_register(void)
2372 {
2373         int result = 0;
2374         if (register_count) {
2375                 /*
2376                  * if the function of acpi_video_register is already called,
2377                  * don't register the acpi_vide_bus again and return no error.
2378                  */
2379                 return 0;
2380         }
2381
2382         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2383         if (!acpi_video_dir)
2384                 return -ENODEV;
2385
2386         result = acpi_bus_register_driver(&acpi_video_bus);
2387         if (result < 0) {
2388                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2389                 return -ENODEV;
2390         }
2391
2392         /*
2393          * When the acpi_video_bus is loaded successfully, increase
2394          * the counter reference.
2395          */
2396         register_count = 1;
2397
2398         return 0;
2399 }
2400 EXPORT_SYMBOL(acpi_video_register);
2401
2402 void acpi_video_unregister(void)
2403 {
2404         if (!register_count) {
2405                 /*
2406                  * If the acpi video bus is already unloaded, don't
2407                  * unload it again and return directly.
2408                  */
2409                 return;
2410         }
2411         acpi_bus_unregister_driver(&acpi_video_bus);
2412
2413         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2414
2415         register_count = 0;
2416
2417         return;
2418 }
2419 EXPORT_SYMBOL(acpi_video_unregister);
2420
2421 /*
2422  * This is kind of nasty. Hardware using Intel chipsets may require
2423  * the video opregion code to be run first in order to initialise
2424  * state before any ACPI video calls are made. To handle this we defer
2425  * registration of the video class until the opregion code has run.
2426  */
2427
2428 static int __init acpi_video_init(void)
2429 {
2430         dmi_check_system(video_dmi_table);
2431
2432         if (intel_opregion_present())
2433                 return 0;
2434
2435         return acpi_video_register();
2436 }
2437
2438 static void __exit acpi_video_exit(void)
2439 {
2440         acpi_video_unregister();
2441
2442         return;
2443 }
2444
2445 module_init(acpi_video_init);
2446 module_exit(acpi_video_exit);