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 <linux/slab.h>
  43 #include <asm/uaccess.h>
  44 #include <linux/dmi.h>
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_VIDEO_CLASS                "video"
  51 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  52 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  53 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  54 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  55 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  58
  59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  64
  65 #define MAX_NAME_LEN    20
  66
  67 #define ACPI_VIDEO_DISPLAY_CRT  1
  68 #define ACPI_VIDEO_DISPLAY_TV   2
  69 #define ACPI_VIDEO_DISPLAY_DVI  3
  70 #define ACPI_VIDEO_DISPLAY_LCD  4
  71
  72 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  73 ACPI_MODULE_NAME("video");
  74
  75 MODULE_AUTHOR("Bruno Ducrot");
  76 MODULE_DESCRIPTION("ACPI Video Driver");
  77 MODULE_LICENSE("GPL");
  78
  79 static int brightness_switch_enabled = 1;
  80 module_param(brightness_switch_enabled, bool, 0644);
  81
  82 /*
  83  * By default, we don't allow duplicate ACPI video bus devices
  84  * under the same VGA controller
  85  */
  86 static int allow_duplicates;
  87 module_param(allow_duplicates, bool, 0644);
  88
  89 static int register_count = 0;
  90 static int acpi_video_bus_add(struct acpi_device *device);
  91 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  92 static int acpi_video_resume(struct acpi_device *device);
  93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  94
  95 static const struct acpi_device_id video_device_ids[] = {
  96         {ACPI_VIDEO_HID, 0},
  97         {"", 0},
  98 };
  99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 100
 101 static struct acpi_driver acpi_video_bus = {
 102         .name = "video",
 103         .class = ACPI_VIDEO_CLASS,
 104         .ids = video_device_ids,
 105         .ops = {
 106                 .add = acpi_video_bus_add,
 107                 .remove = acpi_video_bus_remove,
 108                 .resume = acpi_video_resume,
 109                 .notify = acpi_video_bus_notify,
 110                 },
 111 };
 112
 113 struct acpi_video_bus_flags {
 114         u8 multihead:1;         /* can switch video heads */
 115         u8 rom:1;               /* can retrieve a video rom */
 116         u8 post:1;              /* can configure the head to */
 117         u8 reserved:5;
 118 };
 119
 120 struct acpi_video_bus_cap {
 121         u8 _DOS:1;              /*Enable/Disable output switching */
 122         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 123         u8 _ROM:1;              /*Get ROM Data */
 124         u8 _GPD:1;              /*Get POST Device */
 125         u8 _SPD:1;              /*Set POST Device */
 126         u8 _VPO:1;              /*Video POST Options */
 127         u8 reserved:2;
 128 };
 129
 130 struct acpi_video_device_attrib {
 131         u32 display_index:4;    /* A zero-based instance of the Display */
 132         u32 display_port_attachment:4;  /*This field differentiates the display type */
 133         u32 display_type:4;     /*Describe the specific type in use */
 134         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 135         u32 bios_can_detect:1;  /*BIOS can detect the device */
 136         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 137                                    the VGA device. */
 138         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 139         u32 reserved:10;        /*Must be 0 */
 140         u32 device_id_scheme:1; /*Device ID Scheme */
 141 };
 142
 143 struct acpi_video_enumerated_device {
 144         union {
 145                 u32 int_val;
 146                 struct acpi_video_device_attrib attrib;
 147         } value;
 148         struct acpi_video_device *bind_info;
 149 };
 150
 151 struct acpi_video_bus {
 152         struct acpi_device *device;
 153         u8 dos_setting;
 154         struct acpi_video_enumerated_device *attached_array;
 155         u8 attached_count;
 156         struct acpi_video_bus_cap cap;
 157         struct acpi_video_bus_flags flags;
 158         struct list_head video_device_list;
 159         struct mutex device_list_lock;  /* protects video_device_list */
 160         struct proc_dir_entry *dir;
 161         struct input_dev *input;
 162         char phys[32];  /* for input device */
 163 };
 164
 165 struct acpi_video_device_flags {
 166         u8 crt:1;
 167         u8 lcd:1;
 168         u8 tvout:1;
 169         u8 dvi:1;
 170         u8 bios:1;
 171         u8 unknown:1;
 172         u8 reserved:2;
 173 };
 174
 175 struct acpi_video_device_cap {
 176         u8 _ADR:1;              /*Return the unique ID */
 177         u8 _BCL:1;              /*Query list of brightness control levels supported */
 178         u8 _BCM:1;              /*Set the brightness level */
 179         u8 _BQC:1;              /* Get current brightness level */
 180         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 181         u8 _DDC:1;              /*Return the EDID for this device */
 182         u8 _DCS:1;              /*Return status of output device */
 183         u8 _DGS:1;              /*Query graphics state */
 184         u8 _DSS:1;              /*Device state set */
 185 };
 186
 187 struct acpi_video_brightness_flags {
 188         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 189         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 190         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 191         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 192         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 193 };
 194
 195 struct acpi_video_device_brightness {
 196         int curr;
 197         int count;
 198         int *levels;
 199         struct acpi_video_brightness_flags flags;
 200 };
 201
 202 struct acpi_video_device {
 203         unsigned long device_id;
 204         struct acpi_video_device_flags flags;
 205         struct acpi_video_device_cap cap;
 206         struct list_head entry;
 207         struct acpi_video_bus *video;
 208         struct acpi_device *dev;
 209         struct acpi_video_device_brightness *brightness;
 210         struct backlight_device *backlight;
 211         struct thermal_cooling_device *cooling_dev;
 212         struct output_device *output_dev;
 213 };
 214
 215 /* bus */
 216 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 217 static const struct file_operations acpi_video_bus_info_fops = {
 218         .owner = THIS_MODULE,
 219         .open = acpi_video_bus_info_open_fs,
 220         .read = seq_read,
 221         .llseek = seq_lseek,
 222         .release = single_release,
 223 };
 224
 225 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 226 static const struct file_operations acpi_video_bus_ROM_fops = {
 227         .owner = THIS_MODULE,
 228         .open = acpi_video_bus_ROM_open_fs,
 229         .read = seq_read,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 235                                             struct file *file);
 236 static const struct file_operations acpi_video_bus_POST_info_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_video_bus_POST_info_open_fs,
 239         .read = seq_read,
 240         .llseek = seq_lseek,
 241         .release = single_release,
 242 };
 243
 244 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 245 static ssize_t acpi_video_bus_write_POST(struct file *file,
 246         const char __user *buffer, size_t count, loff_t *data);
 247 static const struct file_operations acpi_video_bus_POST_fops = {
 248         .owner = THIS_MODULE,
 249         .open = acpi_video_bus_POST_open_fs,
 250         .read = seq_read,
 251         .write = acpi_video_bus_write_POST,
 252         .llseek = seq_lseek,
 253         .release = single_release,
 254 };
 255
 256 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 257 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 258         const char __user *buffer, size_t count, loff_t *data);
 259 static const struct file_operations acpi_video_bus_DOS_fops = {
 260         .owner = THIS_MODULE,
 261         .open = acpi_video_bus_DOS_open_fs,
 262         .read = seq_read,
 263         .write = acpi_video_bus_write_DOS,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 /* device */
 269 static int acpi_video_device_info_open_fs(struct inode *inode,
 270                                           struct file *file);
 271 static const struct file_operations acpi_video_device_info_fops = {
 272         .owner = THIS_MODULE,
 273         .open = acpi_video_device_info_open_fs,
 274         .read = seq_read,
 275         .llseek = seq_lseek,
 276         .release = single_release,
 277 };
 278
 279 static int acpi_video_device_state_open_fs(struct inode *inode,
 280                                            struct file *file);
 281 static ssize_t acpi_video_device_write_state(struct file *file,
 282         const char __user *buffer, size_t count, loff_t *data);
 283 static const struct file_operations acpi_video_device_state_fops = {
 284         .owner = THIS_MODULE,
 285         .open = acpi_video_device_state_open_fs,
 286         .read = seq_read,
 287         .write = acpi_video_device_write_state,
 288         .llseek = seq_lseek,
 289         .release = single_release,
 290 };
 291
 292 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 293                                                 struct file *file);
 294 static ssize_t acpi_video_device_write_brightness(struct file *file,
 295         const char __user *buffer, size_t count, loff_t *data);
 296 static const struct file_operations acpi_video_device_brightness_fops = {
 297         .owner = THIS_MODULE,
 298         .open = acpi_video_device_brightness_open_fs,
 299         .read = seq_read,
 300         .write = acpi_video_device_write_brightness,
 301         .llseek = seq_lseek,
 302         .release = single_release,
 303 };
 304
 305 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 306                                           struct file *file);
 307 static const struct file_operations acpi_video_device_EDID_fops = {
 308         .owner = THIS_MODULE,
 309         .open = acpi_video_device_EDID_open_fs,
 310         .read = seq_read,
 311         .llseek = seq_lseek,
 312         .release = single_release,
 313 };
 314
 315 static const char device_decode[][30] = {
 316         "motherboard VGA device",
 317         "PCI VGA device",
 318         "AGP VGA device",
 319         "UNKNOWN",
 320 };
 321
 322 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 323 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 324 static void acpi_video_device_bind(struct acpi_video_bus *video,
 325                                    struct acpi_video_device *device);
 326 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 327 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 328                         int level);
 329 static int acpi_video_device_lcd_get_level_current(
 330                         struct acpi_video_device *device,
 331                         unsigned long long *level, int init);
 332 static int acpi_video_get_next_level(struct acpi_video_device *device,
 333                                      u32 level_current, u32 event);
 334 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 335                                          int event);
 336 static int acpi_video_device_get_state(struct acpi_video_device *device,
 337                             unsigned long long *state);
 338 static int acpi_video_output_get(struct output_device *od);
 339 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 340
 341 /*backlight device sysfs support*/
 342 static int acpi_video_get_brightness(struct backlight_device *bd)
 343 {
 344         unsigned long long cur_level;
 345         int i;
 346         struct acpi_video_device *vd =
 347                 (struct acpi_video_device *)bl_get_data(bd);
 348
 349         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 350                 return -EINVAL;
 351         for (i = 2; i < vd->brightness->count; i++) {
 352                 if (vd->brightness->levels[i] == cur_level)
 353                         /* The first two entries are special - see page 575
 354                            of the ACPI spec 3.0 */
 355                         return i-2;
 356         }
 357         return 0;
 358 }
 359
 360 static int acpi_video_set_brightness(struct backlight_device *bd)
 361 {
 362         int request_level = bd->props.brightness + 2;
 363         struct acpi_video_device *vd =
 364                 (struct acpi_video_device *)bl_get_data(bd);
 365
 366         return acpi_video_device_lcd_set_level(vd,
 367                                 vd->brightness->levels[request_level]);
 368 }
 369
 370 static struct backlight_ops acpi_backlight_ops = {
 371         .get_brightness = acpi_video_get_brightness,
 372         .update_status  = acpi_video_set_brightness,
 373 };
 374
 375 /*video output device sysfs support*/
 376 static int acpi_video_output_get(struct output_device *od)
 377 {
 378         unsigned long long state;
 379         struct acpi_video_device *vd =
 380                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 381         acpi_video_device_get_state(vd, &state);
 382         return (int)state;
 383 }
 384
 385 static int acpi_video_output_set(struct output_device *od)
 386 {
 387         unsigned long state = od->request_state;
 388         struct acpi_video_device *vd=
 389                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 390         return acpi_video_device_set_state(vd, state);
 391 }
 392
 393 static struct output_properties acpi_output_properties = {
 394         .set_state = acpi_video_output_set,
 395         .get_status = acpi_video_output_get,
 396 };
 397
 398
 399 /* thermal cooling device callbacks */
 400 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 401                                long *state)
 402 {
 403         struct acpi_device *device = cooling_dev->devdata;
 404         struct acpi_video_device *video = acpi_driver_data(device);
 405
 406         *state = video->brightness->count - 3;
 407         return 0;
 408 }
 409
 410 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 411                                long *state)
 412 {
 413         struct acpi_device *device = cooling_dev->devdata;
 414         struct acpi_video_device *video = acpi_driver_data(device);
 415         unsigned long long level;
 416         int offset;
 417
 418         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 419                 return -EINVAL;
 420         for (offset = 2; offset < video->brightness->count; offset++)
 421                 if (level == video->brightness->levels[offset]) {
 422                         *state = video->brightness->count - offset - 1;
 423                         return 0;
 424                 }
 425
 426         return -EINVAL;
 427 }
 428
 429 static int
 430 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 431 {
 432         struct acpi_device *device = cooling_dev->devdata;
 433         struct acpi_video_device *video = acpi_driver_data(device);
 434         int level;
 435
 436         if ( state >= video->brightness->count - 2)
 437                 return -EINVAL;
 438
 439         state = video->brightness->count - state;
 440         level = video->brightness->levels[state -1];
 441         return acpi_video_device_lcd_set_level(video, level);
 442 }
 443
 444 static struct thermal_cooling_device_ops video_cooling_ops = {
 445         .get_max_state = video_get_max_state,
 446         .get_cur_state = video_get_cur_state,
 447         .set_cur_state = video_set_cur_state,
 448 };
 449
 450 /* --------------------------------------------------------------------------
 451                                Video Management
 452    -------------------------------------------------------------------------- */
 453
 454 /* device */
 455
 456 static int
 457 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 458 {
 459         int status;
 460
 461         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 462
 463         return status;
 464 }
 465
 466 static int
 467 acpi_video_device_get_state(struct acpi_video_device *device,
 468                             unsigned long long *state)
 469 {
 470         int status;
 471
 472         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 473
 474         return status;
 475 }
 476
 477 static int
 478 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 479 {
 480         int status;
 481         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 482         struct acpi_object_list args = { 1, &arg0 };
 483         unsigned long long ret;
 484
 485
 486         arg0.integer.value = state;
 487         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 488
 489         return status;
 490 }
 491
 492 static int
 493 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 494                                    union acpi_object **levels)
 495 {
 496         int status;
 497         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 498         union acpi_object *obj;
 499
 500
 501         *levels = NULL;
 502
 503         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 504         if (!ACPI_SUCCESS(status))
 505                 return status;
 506         obj = (union acpi_object *)buffer.pointer;
 507         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 508                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 509                 status = -EFAULT;
 510                 goto err;
 511         }
 512
 513         *levels = obj;
 514
 515         return 0;
 516
 517       err:
 518         kfree(buffer.pointer);
 519
 520         return status;
 521 }
 522
 523 static int
 524 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 525 {
 526         int status;
 527         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 528         struct acpi_object_list args = { 1, &arg0 };
 529         int state;
 530
 531         arg0.integer.value = level;
 532
 533         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 534                                       &args, NULL);
 535         if (ACPI_FAILURE(status)) {
 536                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 537                 return -EIO;
 538         }
 539
 540         device->brightness->curr = level;
 541         for (state = 2; state < device->brightness->count; state++)
 542                 if (level == device->brightness->levels[state]) {
 543                         if (device->backlight)
 544                                 device->backlight->props.brightness = state - 2;
 545                         return 0;
 546                 }
 547
 548         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 549         return -EINVAL;
 550 }
 551
 552 /*
 553  * For some buggy _BQC methods, we need to add a constant value to
 554  * the _BQC return value to get the actual current brightness level
 555  */
 556
 557 static int bqc_offset_aml_bug_workaround;
 558 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 559 {
 560         bqc_offset_aml_bug_workaround = 9;
 561         return 0;
 562 }
 563
 564 static struct dmi_system_id video_dmi_table[] __initdata = {
 565         /*
 566          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 567          */
 568         {
 569          .callback = video_set_bqc_offset,
 570          .ident = "Acer Aspire 5720",
 571          .matches = {
 572                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 573                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 574                 },
 575         },
 576         {
 577          .callback = video_set_bqc_offset,
 578          .ident = "Acer Aspire 5710Z",
 579          .matches = {
 580                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 582                 },
 583         },
 584         {
 585          .callback = video_set_bqc_offset,
 586          .ident = "eMachines E510",
 587          .matches = {
 588                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 589                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 590                 },
 591         },
 592         {
 593          .callback = video_set_bqc_offset,
 594          .ident = "Acer Aspire 5315",
 595          .matches = {
 596                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 597                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 598                 },
 599         },
 600         {
 601          .callback = video_set_bqc_offset,
 602          .ident = "Acer Aspire 7720",
 603          .matches = {
 604                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 605                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 606                 },
 607         },
 608         {}
 609 };
 610
 611 static int
 612 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 613                                         unsigned long long *level, int init)
 614 {
 615         acpi_status status = AE_OK;
 616         int i;
 617
 618         if (device->cap._BQC || device->cap._BCQ) {
 619                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 620
 621                 status = acpi_evaluate_integer(device->dev->handle, buf,
 622                                                 NULL, level);
 623                 if (ACPI_SUCCESS(status)) {
 624                         if (device->brightness->flags._BQC_use_index) {
 625                                 if (device->brightness->flags._BCL_reversed)
 626                                         *level = device->brightness->count
 627                                                                  - 3 - (*level);
 628                                 *level = device->brightness->levels[*level + 2];
 629
 630                         }
 631                         *level += bqc_offset_aml_bug_workaround;
 632                         for (i = 2; i < device->brightness->count; i++)
 633                                 if (device->brightness->levels[i] == *level) {
 634                                         device->brightness->curr = *level;
 635                                         return 0;
 636                         }
 637                         if (!init) {
 638                                 /*
 639                                  * BQC returned an invalid level.
 640                                  * Stop using it.
 641                                  */
 642                                 ACPI_WARNING((AE_INFO,
 643                                               "%s returned an invalid level",
 644                                               buf));
 645                                 device->cap._BQC = device->cap._BCQ = 0;
 646                         }
 647                 } else {
 648                         /* Fixme:
 649                          * should we return an error or ignore this failure?
 650                          * dev->brightness->curr is a cached value which stores
 651                          * the correct current backlight level in most cases.
 652                          * ACPI video backlight still works w/ buggy _BQC.
 653                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 654                          */
 655                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 656                         device->cap._BQC = device->cap._BCQ = 0;
 657                 }
 658         }
 659
 660         *level = device->brightness->curr;
 661         return 0;
 662 }
 663
 664 static int
 665 acpi_video_device_EDID(struct acpi_video_device *device,
 666                        union acpi_object **edid, ssize_t length)
 667 {
 668         int status;
 669         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 670         union acpi_object *obj;
 671         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 672         struct acpi_object_list args = { 1, &arg0 };
 673
 674
 675         *edid = NULL;
 676
 677         if (!device)
 678                 return -ENODEV;
 679         if (length == 128)
 680                 arg0.integer.value = 1;
 681         else if (length == 256)
 682                 arg0.integer.value = 2;
 683         else
 684                 return -EINVAL;
 685
 686         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 687         if (ACPI_FAILURE(status))
 688                 return -ENODEV;
 689
 690         obj = buffer.pointer;
 691
 692         if (obj && obj->type == ACPI_TYPE_BUFFER)
 693                 *edid = obj;
 694         else {
 695                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 696                 status = -EFAULT;
 697                 kfree(obj);
 698         }
 699
 700         return status;
 701 }
 702
 703 /* bus */
 704
 705 static int
 706 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 707 {
 708         int status;
 709         unsigned long long tmp;
 710         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 711         struct acpi_object_list args = { 1, &arg0 };
 712
 713
 714         arg0.integer.value = option;
 715
 716         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 717         if (ACPI_SUCCESS(status))
 718                 status = tmp ? (-EINVAL) : (AE_OK);
 719
 720         return status;
 721 }
 722
 723 static int
 724 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 725 {
 726         int status;
 727
 728         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 729
 730         return status;
 731 }
 732
 733 static int
 734 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 735                             unsigned long long *options)
 736 {
 737         int status;
 738
 739         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 740         *options &= 3;
 741
 742         return status;
 743 }
 744
 745 /*
 746  *  Arg:
 747  *      video           : video bus device pointer
 748  *      bios_flag       :
 749  *              0.      The system BIOS should NOT automatically switch(toggle)
 750  *                      the active display output.
 751  *              1.      The system BIOS should automatically switch (toggle) the
 752  *                      active display output. No switch event.
 753  *              2.      The _DGS value should be locked.
 754  *              3.      The system BIOS should not automatically switch (toggle) the
 755  *                      active display output, but instead generate the display switch
 756  *                      event notify code.
 757  *      lcd_flag        :
 758  *              0.      The system BIOS should automatically control the brightness level
 759  *                      of the LCD when the power changes from AC to DC
 760  *              1.      The system BIOS should NOT automatically control the brightness
 761  *                      level of the LCD when the power changes from AC to DC.
 762  * Return Value:
 763  *              -1      wrong arg.
 764  */
 765
 766 static int
 767 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 768 {
 769         u64 status = 0;
 770         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 771         struct acpi_object_list args = { 1, &arg0 };
 772
 773
 774         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 775                 status = -1;
 776                 goto Failed;
 777         }
 778         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 779         video->dos_setting = arg0.integer.value;
 780         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 781
 782       Failed:
 783         return status;
 784 }
 785
 786 /*
 787  * Simple comparison function used to sort backlight levels.
 788  */
 789
 790 static int
 791 acpi_video_cmp_level(const void *a, const void *b)
 792 {
 793         return *(int *)a - *(int *)b;
 794 }
 795
 796 /*
 797  *  Arg:
 798  *      device  : video output device (LCD, CRT, ..)
 799  *
 800  *  Return Value:
 801  *      Maximum brightness level
 802  *
 803  *  Allocate and initialize device->brightness.
 804  */
 805
 806 static int
 807 acpi_video_init_brightness(struct acpi_video_device *device)
 808 {
 809         union acpi_object *obj = NULL;
 810         int i, max_level = 0, count = 0, level_ac_battery = 0;
 811         unsigned long long level, level_old;
 812         union acpi_object *o;
 813         struct acpi_video_device_brightness *br = NULL;
 814         int result = -EINVAL;
 815
 816         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 817                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 818                                                 "LCD brightness level\n"));
 819                 goto out;
 820         }
 821
 822         if (obj->package.count < 2)
 823                 goto out;
 824
 825         br = kzalloc(sizeof(*br), GFP_KERNEL);
 826         if (!br) {
 827                 printk(KERN_ERR "can't allocate memory\n");
 828                 result = -ENOMEM;
 829                 goto out;
 830         }
 831
 832         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 833                                 GFP_KERNEL);
 834         if (!br->levels) {
 835                 result = -ENOMEM;
 836                 goto out_free;
 837         }
 838
 839         for (i = 0; i < obj->package.count; i++) {
 840                 o = (union acpi_object *)&obj->package.elements[i];
 841                 if (o->type != ACPI_TYPE_INTEGER) {
 842                         printk(KERN_ERR PREFIX "Invalid data\n");
 843                         continue;
 844                 }
 845                 br->levels[count] = (u32) o->integer.value;
 846
 847                 if (br->levels[count] > max_level)
 848                         max_level = br->levels[count];
 849                 count++;
 850         }
 851
 852         /*
 853          * some buggy BIOS don't export the levels
 854          * when machine is on AC/Battery in _BCL package.
 855          * In this case, the first two elements in _BCL packages
 856          * are also supported brightness levels that OS should take care of.
 857          */
 858         for (i = 2; i < count; i++) {
 859                 if (br->levels[i] == br->levels[0])
 860                         level_ac_battery++;
 861                 if (br->levels[i] == br->levels[1])
 862                         level_ac_battery++;
 863         }
 864
 865         if (level_ac_battery < 2) {
 866                 level_ac_battery = 2 - level_ac_battery;
 867                 br->flags._BCL_no_ac_battery_levels = 1;
 868                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 869                         br->levels[i] = br->levels[i - level_ac_battery];
 870                 count += level_ac_battery;
 871         } else if (level_ac_battery > 2)
 872                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 873
 874         /* Check if the _BCL package is in a reversed order */
 875         if (max_level == br->levels[2]) {
 876                 br->flags._BCL_reversed = 1;
 877                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 878                         acpi_video_cmp_level, NULL);
 879         } else if (max_level != br->levels[count - 1])
 880                 ACPI_ERROR((AE_INFO,
 881                             "Found unordered _BCL package\n"));
 882
 883         br->count = count;
 884         device->brightness = br;
 885
 886         /* Check the input/output of _BQC/_BCL/_BCM */
 887         if ((max_level < 100) && (max_level <= (count - 2)))
 888                 br->flags._BCL_use_index = 1;
 889
 890         /*
 891          * _BCM is always consistent with _BCL,
 892          * at least for all the laptops we have ever seen.
 893          */
 894         br->flags._BCM_use_index = br->flags._BCL_use_index;
 895
 896         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 897         br->curr = level = max_level;
 898
 899         if (!device->cap._BQC)
 900                 goto set_level;
 901
 902         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 903         if (result)
 904                 goto out_free_levels;
 905
 906         /*
 907          * Set the level to maximum and check if _BQC uses indexed value
 908          */
 909         result = acpi_video_device_lcd_set_level(device, max_level);
 910         if (result)
 911                 goto out_free_levels;
 912
 913         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 914         if (result)
 915                 goto out_free_levels;
 916
 917         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 918
 919         if (!br->flags._BQC_use_index) {
 920                 /*
 921                  * Set the backlight to the initial state.
 922                  * On some buggy laptops, _BQC returns an uninitialized value
 923                  * when invoked for the first time, i.e. level_old is invalid.
 924                  * set the backlight to max_level in this case
 925                  */
 926                 for (i = 2; i < br->count; i++)
 927                         if (level_old == br->levels[i])
 928                                 level = level_old;
 929                 goto set_level;
 930         }
 931
 932         if (br->flags._BCL_reversed)
 933                 level_old = (br->count - 1) - level_old;
 934         level = br->levels[level_old];
 935
 936 set_level:
 937         result = acpi_video_device_lcd_set_level(device, level);
 938         if (result)
 939                 goto out_free_levels;
 940
 941         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 942                           "found %d brightness levels\n", count - 2));
 943         kfree(obj);
 944         return result;
 945
 946 out_free_levels:
 947         kfree(br->levels);
 948 out_free:
 949         kfree(br);
 950 out:
 951         device->brightness = NULL;
 952         kfree(obj);
 953         return result;
 954 }
 955
 956 /*
 957  *  Arg:
 958  *      device  : video output device (LCD, CRT, ..)
 959  *
 960  *  Return Value:
 961  *      None
 962  *
 963  *  Find out all required AML methods defined under the output
 964  *  device.
 965  */
 966
 967 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 968 {
 969         acpi_handle h_dummy1;
 970
 971         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 972                 device->cap._ADR = 1;
 973         }
 974         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 975                 device->cap._BCL = 1;
 976         }
 977         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 978                 device->cap._BCM = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 981                 device->cap._BQC = 1;
 982         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 983                                 &h_dummy1))) {
 984                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 985                 device->cap._BCQ = 1;
 986         }
 987
 988         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 989                 device->cap._DDC = 1;
 990         }
 991         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 992                 device->cap._DCS = 1;
 993         }
 994         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 995                 device->cap._DGS = 1;
 996         }
 997         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 998                 device->cap._DSS = 1;
 999         }
1000
1001         if (acpi_video_backlight_support()) {
1002                 struct backlight_properties props;
1003                 int result;
1004                 static int count = 0;
1005                 char *name;
1006
1007                 result = acpi_video_init_brightness(device);
1008                 if (result)
1009                         return;
1010                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1011                 if (!name)
1012                         return;
1013
1014                 sprintf(name, "acpi_video%d", count++);
1015                 memset(&props, 0, sizeof(struct backlight_properties));
1016                 props.max_brightness = device->brightness->count - 3;
1017                 device->backlight = backlight_device_register(name, NULL, device,
1018                                                               &acpi_backlight_ops,
1019                                                               &props);
1020                 kfree(name);
1021                 if (IS_ERR(device->backlight))
1022                         return;
1023
1024                 result = sysfs_create_link(&device->backlight->dev.kobj,
1025                                            &device->dev->dev.kobj, "device");
1026                 if (result)
1027                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1028
1029                 device->cooling_dev = thermal_cooling_device_register("LCD",
1030                                         device->dev, &video_cooling_ops);
1031                 if (IS_ERR(device->cooling_dev)) {
1032                         /*
1033                          * Set cooling_dev to NULL so we don't crash trying to
1034                          * free it.
1035                          * Also, why the hell we are returning early and
1036                          * not attempt to register video output if cooling
1037                          * device registration failed?
1038                          * -- dtor
1039                          */
1040                         device->cooling_dev = NULL;
1041                         return;
1042                 }
1043
1044                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1045                          device->cooling_dev->id);
1046                 result = sysfs_create_link(&device->dev->dev.kobj,
1047                                 &device->cooling_dev->device.kobj,
1048                                 "thermal_cooling");
1049                 if (result)
1050                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1051                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1052                                 &device->dev->dev.kobj, "device");
1053                 if (result)
1054                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1055
1056         }
1057
1058         if (acpi_video_display_switch_support()) {
1059
1060                 if (device->cap._DCS && device->cap._DSS) {
1061                         static int count;
1062                         char *name;
1063                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1064                         if (!name)
1065                                 return;
1066                         sprintf(name, "acpi_video%d", count++);
1067                         device->output_dev = video_output_register(name,
1068                                         NULL, device, &acpi_output_properties);
1069                         kfree(name);
1070                 }
1071         }
1072 }
1073
1074 /*
1075  *  Arg:
1076  *      device  : video output device (VGA)
1077  *
1078  *  Return Value:
1079  *      None
1080  *
1081  *  Find out all required AML methods defined under the video bus device.
1082  */
1083
1084 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1085 {
1086         acpi_handle h_dummy1;
1087
1088         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1089                 video->cap._DOS = 1;
1090         }
1091         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1092                 video->cap._DOD = 1;
1093         }
1094         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1095                 video->cap._ROM = 1;
1096         }
1097         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1098                 video->cap._GPD = 1;
1099         }
1100         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1101                 video->cap._SPD = 1;
1102         }
1103         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1104                 video->cap._VPO = 1;
1105         }
1106 }
1107
1108 /*
1109  * Check whether the video bus device has required AML method to
1110  * support the desired features
1111  */
1112
1113 static int acpi_video_bus_check(struct acpi_video_bus *video)
1114 {
1115         acpi_status status = -ENOENT;
1116         struct pci_dev *dev;
1117
1118         if (!video)
1119                 return -EINVAL;
1120
1121         dev = acpi_get_pci_dev(video->device->handle);
1122         if (!dev)
1123                 return -ENODEV;
1124         pci_dev_put(dev);
1125
1126         /* Since there is no HID, CID and so on for VGA driver, we have
1127          * to check well known required nodes.
1128          */
1129
1130         /* Does this device support video switching? */
1131         if (video->cap._DOS || video->cap._DOD) {
1132                 if (!video->cap._DOS) {
1133                         printk(KERN_WARNING FW_BUG
1134                                 "ACPI(%s) defines _DOD but not _DOS\n",
1135                                 acpi_device_bid(video->device));
1136                 }
1137                 video->flags.multihead = 1;
1138                 status = 0;
1139         }
1140
1141         /* Does this device support retrieving a video ROM? */
1142         if (video->cap._ROM) {
1143                 video->flags.rom = 1;
1144                 status = 0;
1145         }
1146
1147         /* Does this device support configuring which video device to POST? */
1148         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1149                 video->flags.post = 1;
1150                 status = 0;
1151         }
1152
1153         return status;
1154 }
1155
1156 /* --------------------------------------------------------------------------
1157                               FS Interface (/proc)
1158    -------------------------------------------------------------------------- */
1159
1160 static struct proc_dir_entry *acpi_video_dir;
1161
1162 /* video devices */
1163
1164 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1165 {
1166         struct acpi_video_device *dev = seq->private;
1167
1168
1169         if (!dev)
1170                 goto end;
1171
1172         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1173         seq_printf(seq, "type:         ");
1174         if (dev->flags.crt)
1175                 seq_printf(seq, "CRT\n");
1176         else if (dev->flags.lcd)
1177                 seq_printf(seq, "LCD\n");
1178         else if (dev->flags.tvout)
1179                 seq_printf(seq, "TVOUT\n");
1180         else if (dev->flags.dvi)
1181                 seq_printf(seq, "DVI\n");
1182         else
1183                 seq_printf(seq, "UNKNOWN\n");
1184
1185         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1186
1187       end:
1188         return 0;
1189 }
1190
1191 static int
1192 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1193 {
1194         return single_open(file, acpi_video_device_info_seq_show,
1195                            PDE(inode)->data);
1196 }
1197
1198 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1199 {
1200         int status;
1201         struct acpi_video_device *dev = seq->private;
1202         unsigned long long state;
1203
1204
1205         if (!dev)
1206                 goto end;
1207
1208         status = acpi_video_device_get_state(dev, &state);
1209         seq_printf(seq, "state:     ");
1210         if (ACPI_SUCCESS(status))
1211                 seq_printf(seq, "0x%02llx\n", state);
1212         else
1213                 seq_printf(seq, "<not supported>\n");
1214
1215         status = acpi_video_device_query(dev, &state);
1216         seq_printf(seq, "query:     ");
1217         if (ACPI_SUCCESS(status))
1218                 seq_printf(seq, "0x%02llx\n", state);
1219         else
1220                 seq_printf(seq, "<not supported>\n");
1221
1222       end:
1223         return 0;
1224 }
1225
1226 static int
1227 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1228 {
1229         return single_open(file, acpi_video_device_state_seq_show,
1230                            PDE(inode)->data);
1231 }
1232
1233 static ssize_t
1234 acpi_video_device_write_state(struct file *file,
1235                               const char __user * buffer,
1236                               size_t count, loff_t * data)
1237 {
1238         int status;
1239         struct seq_file *m = file->private_data;
1240         struct acpi_video_device *dev = m->private;
1241         char str[12] = { 0 };
1242         u32 state = 0;
1243
1244
1245         if (!dev || count >= sizeof(str))
1246                 return -EINVAL;
1247
1248         if (copy_from_user(str, buffer, count))
1249                 return -EFAULT;
1250
1251         str[count] = 0;
1252         state = simple_strtoul(str, NULL, 0);
1253         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1254
1255         status = acpi_video_device_set_state(dev, state);
1256
1257         if (status)
1258                 return -EFAULT;
1259
1260         return count;
1261 }
1262
1263 static int
1264 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1265 {
1266         struct acpi_video_device *dev = seq->private;
1267         int i;
1268
1269
1270         if (!dev || !dev->brightness) {
1271                 seq_printf(seq, "<not supported>\n");
1272                 return 0;
1273         }
1274
1275         seq_printf(seq, "levels: ");
1276         for (i = 2; i < dev->brightness->count; i++)
1277                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1278         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1279
1280         return 0;
1281 }
1282
1283 static int
1284 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1285 {
1286         return single_open(file, acpi_video_device_brightness_seq_show,
1287                            PDE(inode)->data);
1288 }
1289
1290 static ssize_t
1291 acpi_video_device_write_brightness(struct file *file,
1292                                    const char __user * buffer,
1293                                    size_t count, loff_t * data)
1294 {
1295         struct seq_file *m = file->private_data;
1296         struct acpi_video_device *dev = m->private;
1297         char str[5] = { 0 };
1298         unsigned int level = 0;
1299         int i;
1300
1301
1302         if (!dev || !dev->brightness || count >= sizeof(str))
1303                 return -EINVAL;
1304
1305         if (copy_from_user(str, buffer, count))
1306                 return -EFAULT;
1307
1308         str[count] = 0;
1309         level = simple_strtoul(str, NULL, 0);
1310
1311         if (level > 100)
1312                 return -EFAULT;
1313
1314         /* validate through the list of available levels */
1315         for (i = 2; i < dev->brightness->count; i++)
1316                 if (level == dev->brightness->levels[i]) {
1317                         if (!acpi_video_device_lcd_set_level(dev, level))
1318                                 return count;
1319                         break;
1320                 }
1321
1322         return -EINVAL;
1323 }
1324
1325 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1326 {
1327         struct acpi_video_device *dev = seq->private;
1328         int status;
1329         int i;
1330         union acpi_object *edid = NULL;
1331
1332
1333         if (!dev)
1334                 goto out;
1335
1336         status = acpi_video_device_EDID(dev, &edid, 128);
1337         if (ACPI_FAILURE(status)) {
1338                 status = acpi_video_device_EDID(dev, &edid, 256);
1339         }
1340
1341         if (ACPI_FAILURE(status)) {
1342                 goto out;
1343         }
1344
1345         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1346                 for (i = 0; i < edid->buffer.length; i++)
1347                         seq_putc(seq, edid->buffer.pointer[i]);
1348         }
1349
1350       out:
1351         if (!edid)
1352                 seq_printf(seq, "<not supported>\n");
1353         else
1354                 kfree(edid);
1355
1356         return 0;
1357 }
1358
1359 static int
1360 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1361 {
1362         return single_open(file, acpi_video_device_EDID_seq_show,
1363                            PDE(inode)->data);
1364 }
1365
1366 static int acpi_video_device_add_fs(struct acpi_device *device)
1367 {
1368         struct proc_dir_entry *entry, *device_dir;
1369         struct acpi_video_device *vid_dev;
1370
1371         vid_dev = acpi_driver_data(device);
1372         if (!vid_dev)
1373                 return -ENODEV;
1374
1375         device_dir = proc_mkdir(acpi_device_bid(device),
1376                                 vid_dev->video->dir);
1377         if (!device_dir)
1378                 return -ENOMEM;
1379
1380         /* 'info' [R] */
1381         entry = proc_create_data("info", S_IRUGO, device_dir,
1382                         &acpi_video_device_info_fops, acpi_driver_data(device));
1383         if (!entry)
1384                 goto err_remove_dir;
1385
1386         /* 'state' [R/W] */
1387         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1388                                  device_dir,
1389                                  &acpi_video_device_state_fops,
1390                                  acpi_driver_data(device));
1391         if (!entry)
1392                 goto err_remove_info;
1393
1394         /* 'brightness' [R/W] */
1395         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1396                                  device_dir,
1397                                  &acpi_video_device_brightness_fops,
1398                                  acpi_driver_data(device));
1399         if (!entry)
1400                 goto err_remove_state;
1401
1402         /* 'EDID' [R] */
1403         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1404                                  &acpi_video_device_EDID_fops,
1405                                  acpi_driver_data(device));
1406         if (!entry)
1407                 goto err_remove_brightness;
1408
1409         acpi_device_dir(device) = device_dir;
1410
1411         return 0;
1412
1413  err_remove_brightness:
1414         remove_proc_entry("brightness", device_dir);
1415  err_remove_state:
1416         remove_proc_entry("state", device_dir);
1417  err_remove_info:
1418         remove_proc_entry("info", device_dir);
1419  err_remove_dir:
1420         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1421         return -ENOMEM;
1422 }
1423
1424 static int acpi_video_device_remove_fs(struct acpi_device *device)
1425 {
1426         struct acpi_video_device *vid_dev;
1427         struct proc_dir_entry *device_dir;
1428
1429         vid_dev = acpi_driver_data(device);
1430         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1431                 return -ENODEV;
1432
1433         device_dir = acpi_device_dir(device);
1434         if (device_dir) {
1435                 remove_proc_entry("info", device_dir);
1436                 remove_proc_entry("state", device_dir);
1437                 remove_proc_entry("brightness", device_dir);
1438                 remove_proc_entry("EDID", device_dir);
1439                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1440                 acpi_device_dir(device) = NULL;
1441         }
1442
1443         return 0;
1444 }
1445
1446 /* video bus */
1447 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1448 {
1449         struct acpi_video_bus *video = seq->private;
1450
1451
1452         if (!video)
1453                 goto end;
1454
1455         seq_printf(seq, "Switching heads:              %s\n",
1456                    video->flags.multihead ? "yes" : "no");
1457         seq_printf(seq, "Video ROM:                    %s\n",
1458                    video->flags.rom ? "yes" : "no");
1459         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1460                    video->flags.post ? "yes" : "no");
1461
1462       end:
1463         return 0;
1464 }
1465
1466 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1467 {
1468         return single_open(file, acpi_video_bus_info_seq_show,
1469                            PDE(inode)->data);
1470 }
1471
1472 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1473 {
1474         struct acpi_video_bus *video = seq->private;
1475
1476
1477         if (!video)
1478                 goto end;
1479
1480         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1481         seq_printf(seq, "<TODO>\n");
1482
1483       end:
1484         return 0;
1485 }
1486
1487 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1488 {
1489         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1490 }
1491
1492 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1493 {
1494         struct acpi_video_bus *video = seq->private;
1495         unsigned long long options;
1496         int status;
1497
1498
1499         if (!video)
1500                 goto end;
1501
1502         status = acpi_video_bus_POST_options(video, &options);
1503         if (ACPI_SUCCESS(status)) {
1504                 if (!(options & 1)) {
1505                         printk(KERN_WARNING PREFIX
1506                                "The motherboard VGA device is not listed as a possible POST device.\n");
1507                         printk(KERN_WARNING PREFIX
1508                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1509                 }
1510                 printk(KERN_WARNING "%llx\n", options);
1511                 seq_printf(seq, "can POST: <integrated video>");
1512                 if (options & 2)
1513                         seq_printf(seq, " <PCI video>");
1514                 if (options & 4)
1515                         seq_printf(seq, " <AGP video>");
1516                 seq_putc(seq, '\n');
1517         } else
1518                 seq_printf(seq, "<not supported>\n");
1519       end:
1520         return 0;
1521 }
1522
1523 static int
1524 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1525 {
1526         return single_open(file, acpi_video_bus_POST_info_seq_show,
1527                            PDE(inode)->data);
1528 }
1529
1530 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1531 {
1532         struct acpi_video_bus *video = seq->private;
1533         int status;
1534         unsigned long long id;
1535
1536
1537         if (!video)
1538                 goto end;
1539
1540         status = acpi_video_bus_get_POST(video, &id);
1541         if (!ACPI_SUCCESS(status)) {
1542                 seq_printf(seq, "<not supported>\n");
1543                 goto end;
1544         }
1545         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1546
1547       end:
1548         return 0;
1549 }
1550
1551 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1552 {
1553         struct acpi_video_bus *video = seq->private;
1554
1555
1556         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1557
1558         return 0;
1559 }
1560
1561 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1562 {
1563         return single_open(file, acpi_video_bus_POST_seq_show,
1564                            PDE(inode)->data);
1565 }
1566
1567 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1568 {
1569         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1570 }
1571
1572 static ssize_t
1573 acpi_video_bus_write_POST(struct file *file,
1574                           const char __user * buffer,
1575                           size_t count, loff_t * data)
1576 {
1577         int status;
1578         struct seq_file *m = file->private_data;
1579         struct acpi_video_bus *video = m->private;
1580         char str[12] = { 0 };
1581         unsigned long long opt, options;
1582
1583
1584         if (!video || count >= sizeof(str))
1585                 return -EINVAL;
1586
1587         status = acpi_video_bus_POST_options(video, &options);
1588         if (!ACPI_SUCCESS(status))
1589                 return -EINVAL;
1590
1591         if (copy_from_user(str, buffer, count))
1592                 return -EFAULT;
1593
1594         str[count] = 0;
1595         opt = strtoul(str, NULL, 0);
1596         if (opt > 3)
1597                 return -EFAULT;
1598
1599         /* just in case an OEM 'forgot' the motherboard... */
1600         options |= 1;
1601
1602         if (options & (1ul << opt)) {
1603                 status = acpi_video_bus_set_POST(video, opt);
1604                 if (!ACPI_SUCCESS(status))
1605                         return -EFAULT;
1606
1607         }
1608
1609         return count;
1610 }
1611
1612 static ssize_t
1613 acpi_video_bus_write_DOS(struct file *file,
1614                          const char __user * buffer,
1615                          size_t count, loff_t * data)
1616 {
1617         int status;
1618         struct seq_file *m = file->private_data;
1619         struct acpi_video_bus *video = m->private;
1620         char str[12] = { 0 };
1621         unsigned long opt;
1622
1623
1624         if (!video || count >= sizeof(str))
1625                 return -EINVAL;
1626
1627         if (copy_from_user(str, buffer, count))
1628                 return -EFAULT;
1629
1630         str[count] = 0;
1631         opt = strtoul(str, NULL, 0);
1632         if (opt > 7)
1633                 return -EFAULT;
1634
1635         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1636
1637         if (!ACPI_SUCCESS(status))
1638                 return -EFAULT;
1639
1640         return count;
1641 }
1642
1643 static int acpi_video_bus_add_fs(struct acpi_device *device)
1644 {
1645         struct acpi_video_bus *video = acpi_driver_data(device);
1646         struct proc_dir_entry *device_dir;
1647         struct proc_dir_entry *entry;
1648
1649         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1650         if (!device_dir)
1651                 return -ENOMEM;
1652
1653         /* 'info' [R] */
1654         entry = proc_create_data("info", S_IRUGO, device_dir,
1655                                  &acpi_video_bus_info_fops,
1656                                  acpi_driver_data(device));
1657         if (!entry)
1658                 goto err_remove_dir;
1659
1660         /* 'ROM' [R] */
1661         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1662                                  &acpi_video_bus_ROM_fops,
1663                                  acpi_driver_data(device));
1664         if (!entry)
1665                 goto err_remove_info;
1666
1667         /* 'POST_info' [R] */
1668         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1669                                  &acpi_video_bus_POST_info_fops,
1670                                  acpi_driver_data(device));
1671         if (!entry)
1672                 goto err_remove_rom;
1673
1674         /* 'POST' [R/W] */
1675         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1676                                  device_dir,
1677                                  &acpi_video_bus_POST_fops,
1678                                  acpi_driver_data(device));
1679         if (!entry)
1680                 goto err_remove_post_info;
1681
1682         /* 'DOS' [R/W] */
1683         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1684                                  device_dir,
1685                                  &acpi_video_bus_DOS_fops,
1686                                  acpi_driver_data(device));
1687         if (!entry)
1688                 goto err_remove_post;
1689
1690         video->dir = acpi_device_dir(device) = device_dir;
1691         return 0;
1692
1693  err_remove_post:
1694         remove_proc_entry("POST", device_dir);
1695  err_remove_post_info:
1696         remove_proc_entry("POST_info", device_dir);
1697  err_remove_rom:
1698         remove_proc_entry("ROM", device_dir);
1699  err_remove_info:
1700         remove_proc_entry("info", device_dir);
1701  err_remove_dir:
1702         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1703         return -ENOMEM;
1704 }
1705
1706 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1707 {
1708         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1709
1710         if (device_dir) {
1711                 remove_proc_entry("info", device_dir);
1712                 remove_proc_entry("ROM", device_dir);
1713                 remove_proc_entry("POST_info", device_dir);
1714                 remove_proc_entry("POST", device_dir);
1715                 remove_proc_entry("DOS", device_dir);
1716                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1717                 acpi_device_dir(device) = NULL;
1718         }
1719
1720         return 0;
1721 }
1722
1723 /* --------------------------------------------------------------------------
1724                                  Driver Interface
1725    -------------------------------------------------------------------------- */
1726
1727 /* device interface */
1728 static struct acpi_video_device_attrib*
1729 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1730 {
1731         struct acpi_video_enumerated_device *ids;
1732         int i;
1733
1734         for (i = 0; i < video->attached_count; i++) {
1735                 ids = &video->attached_array[i];
1736                 if ((ids->value.int_val & 0xffff) == device_id)
1737                         return &ids->value.attrib;
1738         }
1739
1740         return NULL;
1741 }
1742
1743 static int
1744 acpi_video_bus_get_one_device(struct acpi_device *device,
1745                               struct acpi_video_bus *video)
1746 {
1747         unsigned long long device_id;
1748         int status;
1749         struct acpi_video_device *data;
1750         struct acpi_video_device_attrib* attribute;
1751
1752         if (!device || !video)
1753                 return -EINVAL;
1754
1755         status =
1756             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1757         if (ACPI_SUCCESS(status)) {
1758
1759                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1760                 if (!data)
1761                         return -ENOMEM;
1762
1763                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1764                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1765                 device->driver_data = data;
1766
1767                 data->device_id = device_id;
1768                 data->video = video;
1769                 data->dev = device;
1770
1771                 attribute = acpi_video_get_device_attr(video, device_id);
1772
1773                 if((attribute != NULL) && attribute->device_id_scheme) {
1774                         switch (attribute->display_type) {
1775                         case ACPI_VIDEO_DISPLAY_CRT:
1776                                 data->flags.crt = 1;
1777                                 break;
1778                         case ACPI_VIDEO_DISPLAY_TV:
1779                                 data->flags.tvout = 1;
1780                                 break;
1781                         case ACPI_VIDEO_DISPLAY_DVI:
1782                                 data->flags.dvi = 1;
1783                                 break;
1784                         case ACPI_VIDEO_DISPLAY_LCD:
1785                                 data->flags.lcd = 1;
1786                                 break;
1787                         default:
1788                                 data->flags.unknown = 1;
1789                                 break;
1790                         }
1791                         if(attribute->bios_can_detect)
1792                                 data->flags.bios = 1;
1793                 } else
1794                         data->flags.unknown = 1;
1795
1796                 acpi_video_device_bind(video, data);
1797                 acpi_video_device_find_cap(data);
1798
1799                 status = acpi_install_notify_handler(device->handle,
1800                                                      ACPI_DEVICE_NOTIFY,
1801                                                      acpi_video_device_notify,
1802                                                      data);
1803                 if (ACPI_FAILURE(status)) {
1804                         printk(KERN_ERR PREFIX
1805                                           "Error installing notify handler\n");
1806                         if(data->brightness)
1807                                 kfree(data->brightness->levels);
1808                         kfree(data->brightness);
1809                         kfree(data);
1810                         return -ENODEV;
1811                 }
1812
1813                 mutex_lock(&video->device_list_lock);
1814                 list_add_tail(&data->entry, &video->video_device_list);
1815                 mutex_unlock(&video->device_list_lock);
1816
1817                 acpi_video_device_add_fs(device);
1818
1819                 return 0;
1820         }
1821
1822         return -ENOENT;
1823 }
1824
1825 /*
1826  *  Arg:
1827  *      video   : video bus device
1828  *
1829  *  Return:
1830  *      none
1831  *
1832  *  Enumerate the video device list of the video bus,
1833  *  bind the ids with the corresponding video devices
1834  *  under the video bus.
1835  */
1836
1837 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1838 {
1839         struct acpi_video_device *dev;
1840
1841         mutex_lock(&video->device_list_lock);
1842
1843         list_for_each_entry(dev, &video->video_device_list, entry)
1844                 acpi_video_device_bind(video, dev);
1845
1846         mutex_unlock(&video->device_list_lock);
1847 }
1848
1849 /*
1850  *  Arg:
1851  *      video   : video bus device
1852  *      device  : video output device under the video
1853  *              bus
1854  *
1855  *  Return:
1856  *      none
1857  *
1858  *  Bind the ids with the corresponding video devices
1859  *  under the video bus.
1860  */
1861
1862 static void
1863 acpi_video_device_bind(struct acpi_video_bus *video,
1864                        struct acpi_video_device *device)
1865 {
1866         struct acpi_video_enumerated_device *ids;
1867         int i;
1868
1869         for (i = 0; i < video->attached_count; i++) {
1870                 ids = &video->attached_array[i];
1871                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1872                         ids->bind_info = device;
1873                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1874                 }
1875         }
1876 }
1877
1878 /*
1879  *  Arg:
1880  *      video   : video bus device
1881  *
1882  *  Return:
1883  *      < 0     : error
1884  *
1885  *  Call _DOD to enumerate all devices attached to display adapter
1886  *
1887  */
1888
1889 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1890 {
1891         int status;
1892         int count;
1893         int i;
1894         struct acpi_video_enumerated_device *active_list;
1895         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1896         union acpi_object *dod = NULL;
1897         union acpi_object *obj;
1898
1899         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1900         if (!ACPI_SUCCESS(status)) {
1901                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1902                 return status;
1903         }
1904
1905         dod = buffer.pointer;
1906         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1907                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1908                 status = -EFAULT;
1909                 goto out;
1910         }
1911
1912         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1913                           dod->package.count));
1914
1915         active_list = kcalloc(1 + dod->package.count,
1916                               sizeof(struct acpi_video_enumerated_device),
1917                               GFP_KERNEL);
1918         if (!active_list) {
1919                 status = -ENOMEM;
1920                 goto out;
1921         }
1922
1923         count = 0;
1924         for (i = 0; i < dod->package.count; i++) {
1925                 obj = &dod->package.elements[i];
1926
1927                 if (obj->type != ACPI_TYPE_INTEGER) {
1928                         printk(KERN_ERR PREFIX
1929                                 "Invalid _DOD data in element %d\n", i);
1930                         continue;
1931                 }
1932
1933                 active_list[count].value.int_val = obj->integer.value;
1934                 active_list[count].bind_info = NULL;
1935                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1936                                   (int)obj->integer.value));
1937                 count++;
1938         }
1939
1940         kfree(video->attached_array);
1941
1942         video->attached_array = active_list;
1943         video->attached_count = count;
1944
1945  out:
1946         kfree(buffer.pointer);
1947         return status;
1948 }
1949
1950 static int
1951 acpi_video_get_next_level(struct acpi_video_device *device,
1952                           u32 level_current, u32 event)
1953 {
1954         int min, max, min_above, max_below, i, l, delta = 255;
1955         max = max_below = 0;
1956         min = min_above = 255;
1957         /* Find closest level to level_current */
1958         for (i = 2; i < device->brightness->count; i++) {
1959                 l = device->brightness->levels[i];
1960                 if (abs(l - level_current) < abs(delta)) {
1961                         delta = l - level_current;
1962                         if (!delta)
1963                                 break;
1964                 }
1965         }
1966         /* Ajust level_current to closest available level */
1967         level_current += delta;
1968         for (i = 2; i < device->brightness->count; i++) {
1969                 l = device->brightness->levels[i];
1970                 if (l < min)
1971                         min = l;
1972                 if (l > max)
1973                         max = l;
1974                 if (l < min_above && l > level_current)
1975                         min_above = l;
1976                 if (l > max_below && l < level_current)
1977                         max_below = l;
1978         }
1979
1980         switch (event) {
1981         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1982                 return (level_current < max) ? min_above : min;
1983         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1984                 return (level_current < max) ? min_above : max;
1985         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1986                 return (level_current > min) ? max_below : min;
1987         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1988         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1989                 return 0;
1990         default:
1991                 return level_current;
1992         }
1993 }
1994
1995 static int
1996 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1997 {
1998         unsigned long long level_current, level_next;
1999         int result = -EINVAL;
2000
2001         /* no warning message if acpi_backlight=vendor is used */
2002         if (!acpi_video_backlight_support())
2003                 return 0;
2004
2005         if (!device->brightness)
2006                 goto out;
2007
2008         result = acpi_video_device_lcd_get_level_current(device,
2009                                                          &level_current, 0);
2010         if (result)
2011                 goto out;
2012
2013         level_next = acpi_video_get_next_level(device, level_current, event);
2014
2015         result = acpi_video_device_lcd_set_level(device, level_next);
2016
2017         if (!result)
2018                 backlight_force_update(device->backlight,
2019                                        BACKLIGHT_UPDATE_HOTKEY);
2020
2021 out:
2022         if (result)
2023                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2024
2025         return result;
2026 }
2027
2028 static int
2029 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2030                            struct acpi_device *device)
2031 {
2032         int status = 0;
2033         struct acpi_device *dev;
2034
2035         acpi_video_device_enumerate(video);
2036
2037         list_for_each_entry(dev, &device->children, node) {
2038
2039                 status = acpi_video_bus_get_one_device(dev, video);
2040                 if (ACPI_FAILURE(status)) {
2041                         printk(KERN_WARNING PREFIX
2042                                         "Cant attach device");
2043                         continue;
2044                 }
2045         }
2046         return status;
2047 }
2048
2049 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2050 {
2051         acpi_status status;
2052         struct acpi_video_bus *video;
2053
2054
2055         if (!device || !device->video)
2056                 return -ENOENT;
2057
2058         video = device->video;
2059
2060         acpi_video_device_remove_fs(device->dev);
2061
2062         status = acpi_remove_notify_handler(device->dev->handle,
2063                                             ACPI_DEVICE_NOTIFY,
2064                                             acpi_video_device_notify);
2065         if (device->backlight) {
2066                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2067                 backlight_device_unregister(device->backlight);
2068                 device->backlight = NULL;
2069         }
2070         if (device->cooling_dev) {
2071                 sysfs_remove_link(&device->dev->dev.kobj,
2072                                   "thermal_cooling");
2073                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2074                                   "device");
2075                 thermal_cooling_device_unregister(device->cooling_dev);
2076                 device->cooling_dev = NULL;
2077         }
2078         video_output_unregister(device->output_dev);
2079
2080         return 0;
2081 }
2082
2083 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2084 {
2085         int status;
2086         struct acpi_video_device *dev, *next;
2087
2088         mutex_lock(&video->device_list_lock);
2089
2090         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2091
2092                 status = acpi_video_bus_put_one_device(dev);
2093                 if (ACPI_FAILURE(status))
2094                         printk(KERN_WARNING PREFIX
2095                                "hhuuhhuu bug in acpi video driver.\n");
2096
2097                 if (dev->brightness) {
2098                         kfree(dev->brightness->levels);
2099                         kfree(dev->brightness);
2100                 }
2101                 list_del(&dev->entry);
2102                 kfree(dev);
2103         }
2104
2105         mutex_unlock(&video->device_list_lock);
2106
2107         return 0;
2108 }
2109
2110 /* acpi_video interface */
2111
2112 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2113 {
2114         return acpi_video_bus_DOS(video, 0, 0);
2115 }
2116
2117 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2118 {
2119         return acpi_video_bus_DOS(video, 0, 1);
2120 }
2121
2122 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2123 {
2124         struct acpi_video_bus *video = acpi_driver_data(device);
2125         struct input_dev *input;
2126         int keycode;
2127
2128         if (!video)
2129                 return;
2130
2131         input = video->input;
2132
2133         switch (event) {
2134         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2135                                          * most likely via hotkey. */
2136                 acpi_bus_generate_proc_event(device, event, 0);
2137                 keycode = KEY_SWITCHVIDEOMODE;
2138                 break;
2139
2140         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2141                                          * connector. */
2142                 acpi_video_device_enumerate(video);
2143                 acpi_video_device_rebind(video);
2144                 acpi_bus_generate_proc_event(device, event, 0);
2145                 keycode = KEY_SWITCHVIDEOMODE;
2146                 break;
2147
2148         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2149                 acpi_bus_generate_proc_event(device, event, 0);
2150                 keycode = KEY_SWITCHVIDEOMODE;
2151                 break;
2152         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2153                 acpi_bus_generate_proc_event(device, event, 0);
2154                 keycode = KEY_VIDEO_NEXT;
2155                 break;
2156         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2157                 acpi_bus_generate_proc_event(device, event, 0);
2158                 keycode = KEY_VIDEO_PREV;
2159                 break;
2160
2161         default:
2162                 keycode = KEY_UNKNOWN;
2163                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2164                                   "Unsupported event [0x%x]\n", event));
2165                 break;
2166         }
2167
2168         acpi_notifier_call_chain(device, event, 0);
2169         input_report_key(input, keycode, 1);
2170         input_sync(input);
2171         input_report_key(input, keycode, 0);
2172         input_sync(input);
2173
2174         return;
2175 }
2176
2177 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2178 {
2179         struct acpi_video_device *video_device = data;
2180         struct acpi_device *device = NULL;
2181         struct acpi_video_bus *bus;
2182         struct input_dev *input;
2183         int keycode;
2184
2185         if (!video_device)
2186                 return;
2187
2188         device = video_device->dev;
2189         bus = video_device->video;
2190         input = bus->input;
2191
2192         switch (event) {
2193         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2194                 if (brightness_switch_enabled)
2195                         acpi_video_switch_brightness(video_device, event);
2196                 acpi_bus_generate_proc_event(device, event, 0);
2197                 keycode = KEY_BRIGHTNESS_CYCLE;
2198                 break;
2199         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2200                 if (brightness_switch_enabled)
2201                         acpi_video_switch_brightness(video_device, event);
2202                 acpi_bus_generate_proc_event(device, event, 0);
2203                 keycode = KEY_BRIGHTNESSUP;
2204                 break;
2205         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2206                 if (brightness_switch_enabled)
2207                         acpi_video_switch_brightness(video_device, event);
2208                 acpi_bus_generate_proc_event(device, event, 0);
2209                 keycode = KEY_BRIGHTNESSDOWN;
2210                 break;
2211         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2212                 if (brightness_switch_enabled)
2213                         acpi_video_switch_brightness(video_device, event);
2214                 acpi_bus_generate_proc_event(device, event, 0);
2215                 keycode = KEY_BRIGHTNESS_ZERO;
2216                 break;
2217         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2218                 if (brightness_switch_enabled)
2219                         acpi_video_switch_brightness(video_device, event);
2220                 acpi_bus_generate_proc_event(device, event, 0);
2221                 keycode = KEY_DISPLAY_OFF;
2222                 break;
2223         default:
2224                 keycode = KEY_UNKNOWN;
2225                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2226                                   "Unsupported event [0x%x]\n", event));
2227                 break;
2228         }
2229
2230         acpi_notifier_call_chain(device, event, 0);
2231         input_report_key(input, keycode, 1);
2232         input_sync(input);
2233         input_report_key(input, keycode, 0);
2234         input_sync(input);
2235
2236         return;
2237 }
2238
2239 static int instance;
2240 static int acpi_video_resume(struct acpi_device *device)
2241 {
2242         struct acpi_video_bus *video;
2243         struct acpi_video_device *video_device;
2244         int i;
2245
2246         if (!device || !acpi_driver_data(device))
2247                 return -EINVAL;
2248
2249         video = acpi_driver_data(device);
2250
2251         for (i = 0; i < video->attached_count; i++) {
2252                 video_device = video->attached_array[i].bind_info;
2253                 if (video_device && video_device->backlight)
2254                         acpi_video_set_brightness(video_device->backlight);
2255         }
2256         return AE_OK;
2257 }
2258
2259 static acpi_status
2260 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2261                         void **return_value)
2262 {
2263         struct acpi_device *device = context;
2264         struct acpi_device *sibling;
2265         int result;
2266
2267         if (handle == device->handle)
2268                 return AE_CTRL_TERMINATE;
2269
2270         result = acpi_bus_get_device(handle, &sibling);
2271         if (result)
2272                 return AE_OK;
2273
2274         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2275                         return AE_ALREADY_EXISTS;
2276
2277         return AE_OK;
2278 }
2279
2280 static int acpi_video_bus_add(struct acpi_device *device)
2281 {
2282         struct acpi_video_bus *video;
2283         struct input_dev *input;
2284         int error;
2285         acpi_status status;
2286
2287         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2288                                 device->parent->handle, 1,
2289                                 acpi_video_bus_match, NULL,
2290                                 device, NULL);
2291         if (status == AE_ALREADY_EXISTS) {
2292                 printk(KERN_WARNING FW_BUG
2293                         "Duplicate ACPI video bus devices for the"
2294                         " same VGA controller, please try module "
2295                         "parameter \"video.allow_duplicates=1\""
2296                         "if the current driver doesn't work.\n");
2297                 if (!allow_duplicates)
2298                         return -ENODEV;
2299         }
2300
2301         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2302         if (!video)
2303                 return -ENOMEM;
2304
2305         /* a hack to fix the duplicate name "VID" problem on T61 */
2306         if (!strcmp(device->pnp.bus_id, "VID")) {
2307                 if (instance)
2308                         device->pnp.bus_id[3] = '0' + instance;
2309                 instance ++;
2310         }
2311         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2312         if (!strcmp(device->pnp.bus_id, "VGA")) {
2313                 if (instance)
2314                         device->pnp.bus_id[3] = '0' + instance;
2315                 instance++;
2316         }
2317
2318         video->device = device;
2319         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2320         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2321         device->driver_data = video;
2322
2323         acpi_video_bus_find_cap(video);
2324         error = acpi_video_bus_check(video);
2325         if (error)
2326                 goto err_free_video;
2327
2328         error = acpi_video_bus_add_fs(device);
2329         if (error)
2330                 goto err_free_video;
2331
2332         mutex_init(&video->device_list_lock);
2333         INIT_LIST_HEAD(&video->video_device_list);
2334
2335         acpi_video_bus_get_devices(video, device);
2336         acpi_video_bus_start_devices(video);
2337
2338         video->input = input = input_allocate_device();
2339         if (!input) {
2340                 error = -ENOMEM;
2341                 goto err_stop_video;
2342         }
2343
2344         snprintf(video->phys, sizeof(video->phys),
2345                 "%s/video/input0", acpi_device_hid(video->device));
2346
2347         input->name = acpi_device_name(video->device);
2348         input->phys = video->phys;
2349         input->id.bustype = BUS_HOST;
2350         input->id.product = 0x06;
2351         input->dev.parent = &device->dev;
2352         input->evbit[0] = BIT(EV_KEY);
2353         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2354         set_bit(KEY_VIDEO_NEXT, input->keybit);
2355         set_bit(KEY_VIDEO_PREV, input->keybit);
2356         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2357         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2358         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2359         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2360         set_bit(KEY_DISPLAY_OFF, input->keybit);
2361         set_bit(KEY_UNKNOWN, input->keybit);
2362
2363         error = input_register_device(input);
2364         if (error)
2365                 goto err_free_input_dev;
2366
2367         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2368                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2369                video->flags.multihead ? "yes" : "no",
2370                video->flags.rom ? "yes" : "no",
2371                video->flags.post ? "yes" : "no");
2372
2373         return 0;
2374
2375  err_free_input_dev:
2376         input_free_device(input);
2377  err_stop_video:
2378         acpi_video_bus_stop_devices(video);
2379         acpi_video_bus_put_devices(video);
2380         kfree(video->attached_array);
2381         acpi_video_bus_remove_fs(device);
2382  err_free_video:
2383         kfree(video);
2384         device->driver_data = NULL;
2385
2386         return error;
2387 }
2388
2389 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2390 {
2391         struct acpi_video_bus *video = NULL;
2392
2393
2394         if (!device || !acpi_driver_data(device))
2395                 return -EINVAL;
2396
2397         video = acpi_driver_data(device);
2398
2399         acpi_video_bus_stop_devices(video);
2400         acpi_video_bus_put_devices(video);
2401         acpi_video_bus_remove_fs(device);
2402
2403         input_unregister_device(video->input);
2404         kfree(video->attached_array);
2405         kfree(video);
2406
2407         return 0;
2408 }
2409
2410 static int __init intel_opregion_present(void)
2411 {
2412 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2413         struct pci_dev *dev = NULL;
2414         u32 address;
2415
2416         for_each_pci_dev(dev) {
2417                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2418                         continue;
2419                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2420                         continue;
2421                 pci_read_config_dword(dev, 0xfc, &address);
2422                 if (!address)
2423                         continue;
2424                 return 1;
2425         }
2426 #endif
2427         return 0;
2428 }
2429
2430 int acpi_video_register(void)
2431 {
2432         int result = 0;
2433         if (register_count) {
2434                 /*
2435                  * if the function of acpi_video_register is already called,
2436                  * don't register the acpi_vide_bus again and return no error.
2437                  */
2438                 return 0;
2439         }
2440
2441         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2442         if (!acpi_video_dir)
2443                 return -ENODEV;
2444
2445         result = acpi_bus_register_driver(&acpi_video_bus);
2446         if (result < 0) {
2447                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2448                 return -ENODEV;
2449         }
2450
2451         /*
2452          * When the acpi_video_bus is loaded successfully, increase
2453          * the counter reference.
2454          */
2455         register_count = 1;
2456
2457         return 0;
2458 }
2459 EXPORT_SYMBOL(acpi_video_register);
2460
2461 void acpi_video_unregister(void)
2462 {
2463         if (!register_count) {
2464                 /*
2465                  * If the acpi video bus is already unloaded, don't
2466                  * unload it again and return directly.
2467                  */
2468                 return;
2469         }
2470         acpi_bus_unregister_driver(&acpi_video_bus);
2471
2472         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2473
2474         register_count = 0;
2475
2476         return;
2477 }
2478 EXPORT_SYMBOL(acpi_video_unregister);
2479
2480 /*
2481  * This is kind of nasty. Hardware using Intel chipsets may require
2482  * the video opregion code to be run first in order to initialise
2483  * state before any ACPI video calls are made. To handle this we defer
2484  * registration of the video class until the opregion code has run.
2485  */
2486
2487 static int __init acpi_video_init(void)
2488 {
2489         dmi_check_system(video_dmi_table);
2490
2491         if (intel_opregion_present())
2492                 return 0;
2493
2494         return acpi_video_register();
2495 }
2496
2497 static void __exit acpi_video_exit(void)
2498 {
2499         acpi_video_unregister();
2500
2501         return;
2502 }
2503
2504 module_init(acpi_video_init);
2505 module_exit(acpi_video_exit);