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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43 #include <linux/dmi.h>
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_CLASS                "video"
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define ACPI_VIDEO_DISPLAY_CRT  1
  67 #define ACPI_VIDEO_DISPLAY_TV   2
  68 #define ACPI_VIDEO_DISPLAY_DVI  3
  69 #define ACPI_VIDEO_DISPLAY_LCD  4
  70
  71 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  72 ACPI_MODULE_NAME("video");
  73
  74 MODULE_AUTHOR("Bruno Ducrot");
  75 MODULE_DESCRIPTION("ACPI Video Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int brightness_switch_enabled = 1;
  79 module_param(brightness_switch_enabled, bool, 0644);
  80
  81 /*
  82  * By default, we don't allow duplicate ACPI video bus devices
  83  * under the same VGA controller
  84  */
  85 static int allow_duplicates;
  86 module_param(allow_duplicates, bool, 0644);
  87
  88 static int register_count = 0;
  89 static int acpi_video_bus_add(struct acpi_device *device);
  90 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  91 static int acpi_video_resume(struct acpi_device *device);
  92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  93
  94 static const struct acpi_device_id video_device_ids[] = {
  95         {ACPI_VIDEO_HID, 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  99
 100 static struct acpi_driver acpi_video_bus = {
 101         .name = "video",
 102         .class = ACPI_VIDEO_CLASS,
 103         .ids = video_device_ids,
 104         .ops = {
 105                 .add = acpi_video_bus_add,
 106                 .remove = acpi_video_bus_remove,
 107                 .resume = acpi_video_resume,
 108                 .notify = acpi_video_bus_notify,
 109                 },
 110 };
 111
 112 struct acpi_video_bus_flags {
 113         u8 multihead:1;         /* can switch video heads */
 114         u8 rom:1;               /* can retrieve a video rom */
 115         u8 post:1;              /* can configure the head to */
 116         u8 reserved:5;
 117 };
 118
 119 struct acpi_video_bus_cap {
 120         u8 _DOS:1;              /*Enable/Disable output switching */
 121         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 122         u8 _ROM:1;              /*Get ROM Data */
 123         u8 _GPD:1;              /*Get POST Device */
 124         u8 _SPD:1;              /*Set POST Device */
 125         u8 _VPO:1;              /*Video POST Options */
 126         u8 reserved:2;
 127 };
 128
 129 struct acpi_video_device_attrib {
 130         u32 display_index:4;    /* A zero-based instance of the Display */
 131         u32 display_port_attachment:4;  /*This field differentiates the display type */
 132         u32 display_type:4;     /*Describe the specific type in use */
 133         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 134         u32 bios_can_detect:1;  /*BIOS can detect the device */
 135         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 136                                    the VGA device. */
 137         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 138         u32 reserved:10;        /*Must be 0 */
 139         u32 device_id_scheme:1; /*Device ID Scheme */
 140 };
 141
 142 struct acpi_video_enumerated_device {
 143         union {
 144                 u32 int_val;
 145                 struct acpi_video_device_attrib attrib;
 146         } value;
 147         struct acpi_video_device *bind_info;
 148 };
 149
 150 struct acpi_video_bus {
 151         struct acpi_device *device;
 152         u8 dos_setting;
 153         struct acpi_video_enumerated_device *attached_array;
 154         u8 attached_count;
 155         struct acpi_video_bus_cap cap;
 156         struct acpi_video_bus_flags flags;
 157         struct list_head video_device_list;
 158         struct mutex device_list_lock;  /* protects video_device_list */
 159         struct proc_dir_entry *dir;
 160         struct input_dev *input;
 161         char phys[32];  /* for input device */
 162 };
 163
 164 struct acpi_video_device_flags {
 165         u8 crt:1;
 166         u8 lcd:1;
 167         u8 tvout:1;
 168         u8 dvi:1;
 169         u8 bios:1;
 170         u8 unknown:1;
 171         u8 reserved:2;
 172 };
 173
 174 struct acpi_video_device_cap {
 175         u8 _ADR:1;              /*Return the unique ID */
 176         u8 _BCL:1;              /*Query list of brightness control levels supported */
 177         u8 _BCM:1;              /*Set the brightness level */
 178         u8 _BQC:1;              /* Get current brightness level */
 179         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 180         u8 _DDC:1;              /*Return the EDID for this device */
 181         u8 _DCS:1;              /*Return status of output device */
 182         u8 _DGS:1;              /*Query graphics state */
 183         u8 _DSS:1;              /*Device state set */
 184 };
 185
 186 struct acpi_video_brightness_flags {
 187         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 188         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 189         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 190         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 191         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 192 };
 193
 194 struct acpi_video_device_brightness {
 195         int curr;
 196         int count;
 197         int *levels;
 198         struct acpi_video_brightness_flags flags;
 199 };
 200
 201 struct acpi_video_device {
 202         unsigned long device_id;
 203         struct acpi_video_device_flags flags;
 204         struct acpi_video_device_cap cap;
 205         struct list_head entry;
 206         struct acpi_video_bus *video;
 207         struct acpi_device *dev;
 208         struct acpi_video_device_brightness *brightness;
 209         struct backlight_device *backlight;
 210         struct thermal_cooling_device *cooling_dev;
 211         struct output_device *output_dev;
 212 };
 213
 214 /* bus */
 215 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 216 static const struct file_operations acpi_video_bus_info_fops = {
 217         .owner = THIS_MODULE,
 218         .open = acpi_video_bus_info_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 225 static const struct file_operations acpi_video_bus_ROM_fops = {
 226         .owner = THIS_MODULE,
 227         .open = acpi_video_bus_ROM_open_fs,
 228         .read = seq_read,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 234                                             struct file *file);
 235 static const struct file_operations acpi_video_bus_POST_info_fops = {
 236         .owner = THIS_MODULE,
 237         .open = acpi_video_bus_POST_info_open_fs,
 238         .read = seq_read,
 239         .llseek = seq_lseek,
 240         .release = single_release,
 241 };
 242
 243 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 244 static ssize_t acpi_video_bus_write_POST(struct file *file,
 245         const char __user *buffer, size_t count, loff_t *data);
 246 static const struct file_operations acpi_video_bus_POST_fops = {
 247         .owner = THIS_MODULE,
 248         .open = acpi_video_bus_POST_open_fs,
 249         .read = seq_read,
 250         .write = acpi_video_bus_write_POST,
 251         .llseek = seq_lseek,
 252         .release = single_release,
 253 };
 254
 255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 256 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 257         const char __user *buffer, size_t count, loff_t *data);
 258 static const struct file_operations acpi_video_bus_DOS_fops = {
 259         .owner = THIS_MODULE,
 260         .open = acpi_video_bus_DOS_open_fs,
 261         .read = seq_read,
 262         .write = acpi_video_bus_write_DOS,
 263         .llseek = seq_lseek,
 264         .release = single_release,
 265 };
 266
 267 /* device */
 268 static int acpi_video_device_info_open_fs(struct inode *inode,
 269                                           struct file *file);
 270 static const struct file_operations acpi_video_device_info_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_info_open_fs,
 273         .read = seq_read,
 274         .llseek = seq_lseek,
 275         .release = single_release,
 276 };
 277
 278 static int acpi_video_device_state_open_fs(struct inode *inode,
 279                                            struct file *file);
 280 static ssize_t acpi_video_device_write_state(struct file *file,
 281         const char __user *buffer, size_t count, loff_t *data);
 282 static const struct file_operations acpi_video_device_state_fops = {
 283         .owner = THIS_MODULE,
 284         .open = acpi_video_device_state_open_fs,
 285         .read = seq_read,
 286         .write = acpi_video_device_write_state,
 287         .llseek = seq_lseek,
 288         .release = single_release,
 289 };
 290
 291 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 292                                                 struct file *file);
 293 static ssize_t acpi_video_device_write_brightness(struct file *file,
 294         const char __user *buffer, size_t count, loff_t *data);
 295 static const struct file_operations acpi_video_device_brightness_fops = {
 296         .owner = THIS_MODULE,
 297         .open = acpi_video_device_brightness_open_fs,
 298         .read = seq_read,
 299         .write = acpi_video_device_write_brightness,
 300         .llseek = seq_lseek,
 301         .release = single_release,
 302 };
 303
 304 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 305                                           struct file *file);
 306 static const struct file_operations acpi_video_device_EDID_fops = {
 307         .owner = THIS_MODULE,
 308         .open = acpi_video_device_EDID_open_fs,
 309         .read = seq_read,
 310         .llseek = seq_lseek,
 311         .release = single_release,
 312 };
 313
 314 static const char device_decode[][30] = {
 315         "motherboard VGA device",
 316         "PCI VGA device",
 317         "AGP VGA device",
 318         "UNKNOWN",
 319 };
 320
 321 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 322 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 323 static void acpi_video_device_bind(struct acpi_video_bus *video,
 324                                    struct acpi_video_device *device);
 325 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 326 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 327                         int level);
 328 static int acpi_video_device_lcd_get_level_current(
 329                         struct acpi_video_device *device,
 330                         unsigned long long *level);
 331 static int acpi_video_get_next_level(struct acpi_video_device *device,
 332                                      u32 level_current, u32 event);
 333 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 334                                          int event);
 335 static int acpi_video_device_get_state(struct acpi_video_device *device,
 336                             unsigned long long *state);
 337 static int acpi_video_output_get(struct output_device *od);
 338 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 339
 340 /*backlight device sysfs support*/
 341 static int acpi_video_get_brightness(struct backlight_device *bd)
 342 {
 343         unsigned long long cur_level;
 344         int i;
 345         struct acpi_video_device *vd =
 346                 (struct acpi_video_device *)bl_get_data(bd);
 347
 348         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 349                 return -EINVAL;
 350         for (i = 2; i < vd->brightness->count; i++) {
 351                 if (vd->brightness->levels[i] == cur_level)
 352                         /* The first two entries are special - see page 575
 353                            of the ACPI spec 3.0 */
 354                         return i-2;
 355         }
 356         return 0;
 357 }
 358
 359 static int acpi_video_set_brightness(struct backlight_device *bd)
 360 {
 361         int request_level = bd->props.brightness + 2;
 362         struct acpi_video_device *vd =
 363                 (struct acpi_video_device *)bl_get_data(bd);
 364
 365         return acpi_video_device_lcd_set_level(vd,
 366                                 vd->brightness->levels[request_level]);
 367 }
 368
 369 static struct backlight_ops acpi_backlight_ops = {
 370         .get_brightness = acpi_video_get_brightness,
 371         .update_status  = acpi_video_set_brightness,
 372 };
 373
 374 /*video output device sysfs support*/
 375 static int acpi_video_output_get(struct output_device *od)
 376 {
 377         unsigned long long state;
 378         struct acpi_video_device *vd =
 379                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 380         acpi_video_device_get_state(vd, &state);
 381         return (int)state;
 382 }
 383
 384 static int acpi_video_output_set(struct output_device *od)
 385 {
 386         unsigned long state = od->request_state;
 387         struct acpi_video_device *vd=
 388                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 389         return acpi_video_device_set_state(vd, state);
 390 }
 391
 392 static struct output_properties acpi_output_properties = {
 393         .set_state = acpi_video_output_set,
 394         .get_status = acpi_video_output_get,
 395 };
 396
 397
 398 /* thermal cooling device callbacks */
 399 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 400                                long *state)
 401 {
 402         struct acpi_device *device = cooling_dev->devdata;
 403         struct acpi_video_device *video = acpi_driver_data(device);
 404
 405         *state = video->brightness->count - 3;
 406         return 0;
 407 }
 408
 409 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 410                                long *state)
 411 {
 412         struct acpi_device *device = cooling_dev->devdata;
 413         struct acpi_video_device *video = acpi_driver_data(device);
 414         unsigned long long level;
 415         int offset;
 416
 417         if (acpi_video_device_lcd_get_level_current(video, &level))
 418                 return -EINVAL;
 419         for (offset = 2; offset < video->brightness->count; offset++)
 420                 if (level == video->brightness->levels[offset]) {
 421                         *state = video->brightness->count - offset - 1;
 422                         return 0;
 423                 }
 424
 425         return -EINVAL;
 426 }
 427
 428 static int
 429 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 430 {
 431         struct acpi_device *device = cooling_dev->devdata;
 432         struct acpi_video_device *video = acpi_driver_data(device);
 433         int level;
 434
 435         if ( state >= video->brightness->count - 2)
 436                 return -EINVAL;
 437
 438         state = video->brightness->count - state;
 439         level = video->brightness->levels[state -1];
 440         return acpi_video_device_lcd_set_level(video, level);
 441 }
 442
 443 static struct thermal_cooling_device_ops video_cooling_ops = {
 444         .get_max_state = video_get_max_state,
 445         .get_cur_state = video_get_cur_state,
 446         .set_cur_state = video_set_cur_state,
 447 };
 448
 449 /* --------------------------------------------------------------------------
 450                                Video Management
 451    -------------------------------------------------------------------------- */
 452
 453 /* device */
 454
 455 static int
 456 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 457 {
 458         int status;
 459
 460         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 461
 462         return status;
 463 }
 464
 465 static int
 466 acpi_video_device_get_state(struct acpi_video_device *device,
 467                             unsigned long long *state)
 468 {
 469         int status;
 470
 471         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 472
 473         return status;
 474 }
 475
 476 static int
 477 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 478 {
 479         int status;
 480         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 481         struct acpi_object_list args = { 1, &arg0 };
 482         unsigned long long ret;
 483
 484
 485         arg0.integer.value = state;
 486         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 487
 488         return status;
 489 }
 490
 491 static int
 492 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 493                                    union acpi_object **levels)
 494 {
 495         int status;
 496         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 497         union acpi_object *obj;
 498
 499
 500         *levels = NULL;
 501
 502         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 503         if (!ACPI_SUCCESS(status))
 504                 return status;
 505         obj = (union acpi_object *)buffer.pointer;
 506         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 507                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 508                 status = -EFAULT;
 509                 goto err;
 510         }
 511
 512         *levels = obj;
 513
 514         return 0;
 515
 516       err:
 517         kfree(buffer.pointer);
 518
 519         return status;
 520 }
 521
 522 static int
 523 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 524 {
 525         int status;
 526         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 527         struct acpi_object_list args = { 1, &arg0 };
 528         int state;
 529
 530         arg0.integer.value = level;
 531
 532         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 533                                       &args, NULL);
 534         if (ACPI_FAILURE(status)) {
 535                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 536                 return -EIO;
 537         }
 538
 539         device->brightness->curr = level;
 540         for (state = 2; state < device->brightness->count; state++)
 541                 if (level == device->brightness->levels[state]) {
 542                         if (device->backlight)
 543                                 device->backlight->props.brightness = state - 2;
 544                         return 0;
 545                 }
 546
 547         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 548         return -EINVAL;
 549 }
 550
 551 /*
 552  * For some buggy _BQC methods, we need to add a constant value to
 553  * the _BQC return value to get the actual current brightness level
 554  */
 555
 556 static int bqc_offset_aml_bug_workaround;
 557 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 558 {
 559         bqc_offset_aml_bug_workaround = 9;
 560         return 0;
 561 }
 562
 563 static struct dmi_system_id video_dmi_table[] __initdata = {
 564         /*
 565          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 566          */
 567         {
 568          .callback = video_set_bqc_offset,
 569          .ident = "Acer Aspire 5720",
 570          .matches = {
 571                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 572                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 573                 },
 574         },
 575         {
 576          .callback = video_set_bqc_offset,
 577          .ident = "Acer Aspire 5710Z",
 578          .matches = {
 579                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 580                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 581                 },
 582         },
 583         {
 584          .callback = video_set_bqc_offset,
 585          .ident = "eMachines E510",
 586          .matches = {
 587                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 588                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 589                 },
 590         },
 591         {
 592          .callback = video_set_bqc_offset,
 593          .ident = "Acer Aspire 5315",
 594          .matches = {
 595                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 596                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 597                 },
 598         },
 599         {
 600          .callback = video_set_bqc_offset,
 601          .ident = "Acer Aspire 7720",
 602          .matches = {
 603                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 604                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 605                 },
 606         },
 607         {}
 608 };
 609
 610 static int
 611 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 612                                         unsigned long long *level)
 613 {
 614         acpi_status status = AE_OK;
 615         int i;
 616
 617         if (device->cap._BQC || device->cap._BCQ) {
 618                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 619
 620                 status = acpi_evaluate_integer(device->dev->handle, buf,
 621                                                 NULL, level);
 622                 if (ACPI_SUCCESS(status)) {
 623                         if (device->brightness->flags._BQC_use_index) {
 624                                 if (device->brightness->flags._BCL_reversed)
 625                                         *level = device->brightness->count
 626                                                                  - 3 - (*level);
 627                                 *level = device->brightness->levels[*level + 2];
 628
 629                         }
 630                         *level += bqc_offset_aml_bug_workaround;
 631                         for (i = 2; i < device->brightness->count; i++)
 632                                 if (device->brightness->levels[i] == *level) {
 633                                         device->brightness->curr = *level;
 634                                         return 0;
 635                         }
 636                         /* BQC returned an invalid level. Stop using it.  */
 637                         ACPI_WARNING((AE_INFO, "%s returned an invalid level",
 638                                                 buf));
 639                         device->cap._BQC = device->cap._BCQ = 0;
 640                 } else {
 641                         /* Fixme:
 642                          * should we return an error or ignore this failure?
 643                          * dev->brightness->curr is a cached value which stores
 644                          * the correct current backlight level in most cases.
 645                          * ACPI video backlight still works w/ buggy _BQC.
 646                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 647                          */
 648                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 649                         device->cap._BQC = device->cap._BCQ = 0;
 650                 }
 651         }
 652
 653         *level = device->brightness->curr;
 654         return 0;
 655 }
 656
 657 static int
 658 acpi_video_device_EDID(struct acpi_video_device *device,
 659                        union acpi_object **edid, ssize_t length)
 660 {
 661         int status;
 662         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 663         union acpi_object *obj;
 664         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 665         struct acpi_object_list args = { 1, &arg0 };
 666
 667
 668         *edid = NULL;
 669
 670         if (!device)
 671                 return -ENODEV;
 672         if (length == 128)
 673                 arg0.integer.value = 1;
 674         else if (length == 256)
 675                 arg0.integer.value = 2;
 676         else
 677                 return -EINVAL;
 678
 679         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 680         if (ACPI_FAILURE(status))
 681                 return -ENODEV;
 682
 683         obj = buffer.pointer;
 684
 685         if (obj && obj->type == ACPI_TYPE_BUFFER)
 686                 *edid = obj;
 687         else {
 688                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 689                 status = -EFAULT;
 690                 kfree(obj);
 691         }
 692
 693         return status;
 694 }
 695
 696 /* bus */
 697
 698 static int
 699 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 700 {
 701         int status;
 702         unsigned long long tmp;
 703         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 704         struct acpi_object_list args = { 1, &arg0 };
 705
 706
 707         arg0.integer.value = option;
 708
 709         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 710         if (ACPI_SUCCESS(status))
 711                 status = tmp ? (-EINVAL) : (AE_OK);
 712
 713         return status;
 714 }
 715
 716 static int
 717 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 718 {
 719         int status;
 720
 721         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 722
 723         return status;
 724 }
 725
 726 static int
 727 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 728                             unsigned long long *options)
 729 {
 730         int status;
 731
 732         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 733         *options &= 3;
 734
 735         return status;
 736 }
 737
 738 /*
 739  *  Arg:
 740  *      video           : video bus device pointer
 741  *      bios_flag       :
 742  *              0.      The system BIOS should NOT automatically switch(toggle)
 743  *                      the active display output.
 744  *              1.      The system BIOS should automatically switch (toggle) the
 745  *                      active display output. No switch event.
 746  *              2.      The _DGS value should be locked.
 747  *              3.      The system BIOS should not automatically switch (toggle) the
 748  *                      active display output, but instead generate the display switch
 749  *                      event notify code.
 750  *      lcd_flag        :
 751  *              0.      The system BIOS should automatically control the brightness level
 752  *                      of the LCD when the power changes from AC to DC
 753  *              1.      The system BIOS should NOT automatically control the brightness
 754  *                      level of the LCD when the power changes from AC to DC.
 755  * Return Value:
 756  *              -1      wrong arg.
 757  */
 758
 759 static int
 760 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 761 {
 762         acpi_integer status = 0;
 763         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 764         struct acpi_object_list args = { 1, &arg0 };
 765
 766
 767         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 768                 status = -1;
 769                 goto Failed;
 770         }
 771         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 772         video->dos_setting = arg0.integer.value;
 773         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 774
 775       Failed:
 776         return status;
 777 }
 778
 779 /*
 780  * Simple comparison function used to sort backlight levels.
 781  */
 782
 783 static int
 784 acpi_video_cmp_level(const void *a, const void *b)
 785 {
 786         return *(int *)a - *(int *)b;
 787 }
 788
 789 /*
 790  *  Arg:
 791  *      device  : video output device (LCD, CRT, ..)
 792  *
 793  *  Return Value:
 794  *      Maximum brightness level
 795  *
 796  *  Allocate and initialize device->brightness.
 797  */
 798
 799 static int
 800 acpi_video_init_brightness(struct acpi_video_device *device)
 801 {
 802         union acpi_object *obj = NULL;
 803         int i, max_level = 0, count = 0, level_ac_battery = 0;
 804         unsigned long long level, level_old;
 805         union acpi_object *o;
 806         struct acpi_video_device_brightness *br = NULL;
 807         int result = -EINVAL;
 808
 809         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 810                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 811                                                 "LCD brightness level\n"));
 812                 goto out;
 813         }
 814
 815         if (obj->package.count < 2)
 816                 goto out;
 817
 818         br = kzalloc(sizeof(*br), GFP_KERNEL);
 819         if (!br) {
 820                 printk(KERN_ERR "can't allocate memory\n");
 821                 result = -ENOMEM;
 822                 goto out;
 823         }
 824
 825         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 826                                 GFP_KERNEL);
 827         if (!br->levels) {
 828                 result = -ENOMEM;
 829                 goto out_free;
 830         }
 831
 832         for (i = 0; i < obj->package.count; i++) {
 833                 o = (union acpi_object *)&obj->package.elements[i];
 834                 if (o->type != ACPI_TYPE_INTEGER) {
 835                         printk(KERN_ERR PREFIX "Invalid data\n");
 836                         continue;
 837                 }
 838                 br->levels[count] = (u32) o->integer.value;
 839
 840                 if (br->levels[count] > max_level)
 841                         max_level = br->levels[count];
 842                 count++;
 843         }
 844
 845         /*
 846          * some buggy BIOS don't export the levels
 847          * when machine is on AC/Battery in _BCL package.
 848          * In this case, the first two elements in _BCL packages
 849          * are also supported brightness levels that OS should take care of.
 850          */
 851         for (i = 2; i < count; i++) {
 852                 if (br->levels[i] == br->levels[0])
 853                         level_ac_battery++;
 854                 if (br->levels[i] == br->levels[1])
 855                         level_ac_battery++;
 856         }
 857
 858         if (level_ac_battery < 2) {
 859                 level_ac_battery = 2 - level_ac_battery;
 860                 br->flags._BCL_no_ac_battery_levels = 1;
 861                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 862                         br->levels[i] = br->levels[i - level_ac_battery];
 863                 count += level_ac_battery;
 864         } else if (level_ac_battery > 2)
 865                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 866
 867         /* Check if the _BCL package is in a reversed order */
 868         if (max_level == br->levels[2]) {
 869                 br->flags._BCL_reversed = 1;
 870                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 871                         acpi_video_cmp_level, NULL);
 872         } else if (max_level != br->levels[count - 1])
 873                 ACPI_ERROR((AE_INFO,
 874                             "Found unordered _BCL package\n"));
 875
 876         br->count = count;
 877         device->brightness = br;
 878
 879         /* Check the input/output of _BQC/_BCL/_BCM */
 880         if ((max_level < 100) && (max_level <= (count - 2)))
 881                 br->flags._BCL_use_index = 1;
 882
 883         /*
 884          * _BCM is always consistent with _BCL,
 885          * at least for all the laptops we have ever seen.
 886          */
 887         br->flags._BCM_use_index = br->flags._BCL_use_index;
 888
 889         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 890         br->curr = level = max_level;
 891
 892         if (!device->cap._BQC)
 893                 goto set_level;
 894
 895         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 896         if (result)
 897                 goto out_free_levels;
 898
 899         /*
 900          * Set the level to maximum and check if _BQC uses indexed value
 901          */
 902         result = acpi_video_device_lcd_set_level(device, max_level);
 903         if (result)
 904                 goto out_free_levels;
 905
 906         result = acpi_video_device_lcd_get_level_current(device, &level);
 907         if (result)
 908                 goto out_free_levels;
 909
 910         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 911
 912         if (!br->flags._BQC_use_index) {
 913                 /*
 914                  * Set the backlight to the initial state.
 915                  * On some buggy laptops, _BQC returns an uninitialized value
 916                  * when invoked for the first time, i.e. level_old is invalid.
 917                  * set the backlight to max_level in this case
 918                  */
 919                 for (i = 2; i < br->count; i++)
 920                         if (level_old == br->levels[i])
 921                                 level = level_old;
 922                 goto set_level;
 923         }
 924
 925         if (br->flags._BCL_reversed)
 926                 level_old = (br->count - 1) - level_old;
 927         level = br->levels[level_old];
 928
 929 set_level:
 930         result = acpi_video_device_lcd_set_level(device, level);
 931         if (result)
 932                 goto out_free_levels;
 933
 934         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 935                           "found %d brightness levels\n", count - 2));
 936         kfree(obj);
 937         return result;
 938
 939 out_free_levels:
 940         kfree(br->levels);
 941 out_free:
 942         kfree(br);
 943 out:
 944         device->brightness = NULL;
 945         kfree(obj);
 946         return result;
 947 }
 948
 949 /*
 950  *  Arg:
 951  *      device  : video output device (LCD, CRT, ..)
 952  *
 953  *  Return Value:
 954  *      None
 955  *
 956  *  Find out all required AML methods defined under the output
 957  *  device.
 958  */
 959
 960 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 961 {
 962         acpi_handle h_dummy1;
 963
 964         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 965                 device->cap._ADR = 1;
 966         }
 967         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 968                 device->cap._BCL = 1;
 969         }
 970         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 971                 device->cap._BCM = 1;
 972         }
 973         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 974                 device->cap._BQC = 1;
 975         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 976                                 &h_dummy1))) {
 977                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 978                 device->cap._BCQ = 1;
 979         }
 980
 981         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 982                 device->cap._DDC = 1;
 983         }
 984         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 985                 device->cap._DCS = 1;
 986         }
 987         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 988                 device->cap._DGS = 1;
 989         }
 990         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 991                 device->cap._DSS = 1;
 992         }
 993
 994         if (acpi_video_backlight_support()) {
 995                 int result;
 996                 static int count = 0;
 997                 char *name;
 998
 999                 result = acpi_video_init_brightness(device);
1000                 if (result)
1001                         return;
1002                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1003                 if (!name)
1004                         return;
1005
1006                 sprintf(name, "acpi_video%d", count++);
1007                 device->backlight = backlight_device_register(name,
1008                         NULL, device, &acpi_backlight_ops);
1009                 kfree(name);
1010                 if (IS_ERR(device->backlight))
1011                         return;
1012                 device->backlight->props.max_brightness = device->brightness->count-3;
1013
1014                 result = sysfs_create_link(&device->backlight->dev.kobj,
1015                                            &device->dev->dev.kobj, "device");
1016                 if (result)
1017                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1018
1019                 device->cooling_dev = thermal_cooling_device_register("LCD",
1020                                         device->dev, &video_cooling_ops);
1021                 if (IS_ERR(device->cooling_dev)) {
1022                         /*
1023                          * Set cooling_dev to NULL so we don't crash trying to
1024                          * free it.
1025                          * Also, why the hell we are returning early and
1026                          * not attempt to register video output if cooling
1027                          * device registration failed?
1028                          * -- dtor
1029                          */
1030                         device->cooling_dev = NULL;
1031                         return;
1032                 }
1033
1034                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1035                          device->cooling_dev->id);
1036                 result = sysfs_create_link(&device->dev->dev.kobj,
1037                                 &device->cooling_dev->device.kobj,
1038                                 "thermal_cooling");
1039                 if (result)
1040                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1041                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1042                                 &device->dev->dev.kobj, "device");
1043                 if (result)
1044                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1045
1046         }
1047
1048         if (acpi_video_display_switch_support()) {
1049
1050                 if (device->cap._DCS && device->cap._DSS) {
1051                         static int count;
1052                         char *name;
1053                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1054                         if (!name)
1055                                 return;
1056                         sprintf(name, "acpi_video%d", count++);
1057                         device->output_dev = video_output_register(name,
1058                                         NULL, device, &acpi_output_properties);
1059                         kfree(name);
1060                 }
1061         }
1062 }
1063
1064 /*
1065  *  Arg:
1066  *      device  : video output device (VGA)
1067  *
1068  *  Return Value:
1069  *      None
1070  *
1071  *  Find out all required AML methods defined under the video bus device.
1072  */
1073
1074 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1075 {
1076         acpi_handle h_dummy1;
1077
1078         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1079                 video->cap._DOS = 1;
1080         }
1081         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1082                 video->cap._DOD = 1;
1083         }
1084         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1085                 video->cap._ROM = 1;
1086         }
1087         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1088                 video->cap._GPD = 1;
1089         }
1090         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1091                 video->cap._SPD = 1;
1092         }
1093         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1094                 video->cap._VPO = 1;
1095         }
1096 }
1097
1098 /*
1099  * Check whether the video bus device has required AML method to
1100  * support the desired features
1101  */
1102
1103 static int acpi_video_bus_check(struct acpi_video_bus *video)
1104 {
1105         acpi_status status = -ENOENT;
1106         struct pci_dev *dev;
1107
1108         if (!video)
1109                 return -EINVAL;
1110
1111         dev = acpi_get_pci_dev(video->device->handle);
1112         if (!dev)
1113                 return -ENODEV;
1114         pci_dev_put(dev);
1115
1116         /* Since there is no HID, CID and so on for VGA driver, we have
1117          * to check well known required nodes.
1118          */
1119
1120         /* Does this device support video switching? */
1121         if (video->cap._DOS || video->cap._DOD) {
1122                 if (!video->cap._DOS) {
1123                         printk(KERN_WARNING FW_BUG
1124                                 "ACPI(%s) defines _DOD but not _DOS\n",
1125                                 acpi_device_bid(video->device));
1126                 }
1127                 video->flags.multihead = 1;
1128                 status = 0;
1129         }
1130
1131         /* Does this device support retrieving a video ROM? */
1132         if (video->cap._ROM) {
1133                 video->flags.rom = 1;
1134                 status = 0;
1135         }
1136
1137         /* Does this device support configuring which video device to POST? */
1138         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1139                 video->flags.post = 1;
1140                 status = 0;
1141         }
1142
1143         return status;
1144 }
1145
1146 /* --------------------------------------------------------------------------
1147                               FS Interface (/proc)
1148    -------------------------------------------------------------------------- */
1149
1150 static struct proc_dir_entry *acpi_video_dir;
1151
1152 /* video devices */
1153
1154 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1155 {
1156         struct acpi_video_device *dev = seq->private;
1157
1158
1159         if (!dev)
1160                 goto end;
1161
1162         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1163         seq_printf(seq, "type:         ");
1164         if (dev->flags.crt)
1165                 seq_printf(seq, "CRT\n");
1166         else if (dev->flags.lcd)
1167                 seq_printf(seq, "LCD\n");
1168         else if (dev->flags.tvout)
1169                 seq_printf(seq, "TVOUT\n");
1170         else if (dev->flags.dvi)
1171                 seq_printf(seq, "DVI\n");
1172         else
1173                 seq_printf(seq, "UNKNOWN\n");
1174
1175         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1176
1177       end:
1178         return 0;
1179 }
1180
1181 static int
1182 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1183 {
1184         return single_open(file, acpi_video_device_info_seq_show,
1185                            PDE(inode)->data);
1186 }
1187
1188 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1189 {
1190         int status;
1191         struct acpi_video_device *dev = seq->private;
1192         unsigned long long state;
1193
1194
1195         if (!dev)
1196                 goto end;
1197
1198         status = acpi_video_device_get_state(dev, &state);
1199         seq_printf(seq, "state:     ");
1200         if (ACPI_SUCCESS(status))
1201                 seq_printf(seq, "0x%02llx\n", state);
1202         else
1203                 seq_printf(seq, "<not supported>\n");
1204
1205         status = acpi_video_device_query(dev, &state);
1206         seq_printf(seq, "query:     ");
1207         if (ACPI_SUCCESS(status))
1208                 seq_printf(seq, "0x%02llx\n", state);
1209         else
1210                 seq_printf(seq, "<not supported>\n");
1211
1212       end:
1213         return 0;
1214 }
1215
1216 static int
1217 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1218 {
1219         return single_open(file, acpi_video_device_state_seq_show,
1220                            PDE(inode)->data);
1221 }
1222
1223 static ssize_t
1224 acpi_video_device_write_state(struct file *file,
1225                               const char __user * buffer,
1226                               size_t count, loff_t * data)
1227 {
1228         int status;
1229         struct seq_file *m = file->private_data;
1230         struct acpi_video_device *dev = m->private;
1231         char str[12] = { 0 };
1232         u32 state = 0;
1233
1234
1235         if (!dev || count >= sizeof(str))
1236                 return -EINVAL;
1237
1238         if (copy_from_user(str, buffer, count))
1239                 return -EFAULT;
1240
1241         str[count] = 0;
1242         state = simple_strtoul(str, NULL, 0);
1243         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1244
1245         status = acpi_video_device_set_state(dev, state);
1246
1247         if (status)
1248                 return -EFAULT;
1249
1250         return count;
1251 }
1252
1253 static int
1254 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1255 {
1256         struct acpi_video_device *dev = seq->private;
1257         int i;
1258
1259
1260         if (!dev || !dev->brightness) {
1261                 seq_printf(seq, "<not supported>\n");
1262                 return 0;
1263         }
1264
1265         seq_printf(seq, "levels: ");
1266         for (i = 2; i < dev->brightness->count; i++)
1267                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1268         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1269
1270         return 0;
1271 }
1272
1273 static int
1274 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1275 {
1276         return single_open(file, acpi_video_device_brightness_seq_show,
1277                            PDE(inode)->data);
1278 }
1279
1280 static ssize_t
1281 acpi_video_device_write_brightness(struct file *file,
1282                                    const char __user * buffer,
1283                                    size_t count, loff_t * data)
1284 {
1285         struct seq_file *m = file->private_data;
1286         struct acpi_video_device *dev = m->private;
1287         char str[5] = { 0 };
1288         unsigned int level = 0;
1289         int i;
1290
1291
1292         if (!dev || !dev->brightness || count >= sizeof(str))
1293                 return -EINVAL;
1294
1295         if (copy_from_user(str, buffer, count))
1296                 return -EFAULT;
1297
1298         str[count] = 0;
1299         level = simple_strtoul(str, NULL, 0);
1300
1301         if (level > 100)
1302                 return -EFAULT;
1303
1304         /* validate through the list of available levels */
1305         for (i = 2; i < dev->brightness->count; i++)
1306                 if (level == dev->brightness->levels[i]) {
1307                         if (!acpi_video_device_lcd_set_level(dev, level))
1308                                 return count;
1309                         break;
1310                 }
1311
1312         return -EINVAL;
1313 }
1314
1315 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1316 {
1317         struct acpi_video_device *dev = seq->private;
1318         int status;
1319         int i;
1320         union acpi_object *edid = NULL;
1321
1322
1323         if (!dev)
1324                 goto out;
1325
1326         status = acpi_video_device_EDID(dev, &edid, 128);
1327         if (ACPI_FAILURE(status)) {
1328                 status = acpi_video_device_EDID(dev, &edid, 256);
1329         }
1330
1331         if (ACPI_FAILURE(status)) {
1332                 goto out;
1333         }
1334
1335         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1336                 for (i = 0; i < edid->buffer.length; i++)
1337                         seq_putc(seq, edid->buffer.pointer[i]);
1338         }
1339
1340       out:
1341         if (!edid)
1342                 seq_printf(seq, "<not supported>\n");
1343         else
1344                 kfree(edid);
1345
1346         return 0;
1347 }
1348
1349 static int
1350 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1351 {
1352         return single_open(file, acpi_video_device_EDID_seq_show,
1353                            PDE(inode)->data);
1354 }
1355
1356 static int acpi_video_device_add_fs(struct acpi_device *device)
1357 {
1358         struct proc_dir_entry *entry, *device_dir;
1359         struct acpi_video_device *vid_dev;
1360
1361         vid_dev = acpi_driver_data(device);
1362         if (!vid_dev)
1363                 return -ENODEV;
1364
1365         device_dir = proc_mkdir(acpi_device_bid(device),
1366                                 vid_dev->video->dir);
1367         if (!device_dir)
1368                 return -ENOMEM;
1369
1370         /* 'info' [R] */
1371         entry = proc_create_data("info", S_IRUGO, device_dir,
1372                         &acpi_video_device_info_fops, acpi_driver_data(device));
1373         if (!entry)
1374                 goto err_remove_dir;
1375
1376         /* 'state' [R/W] */
1377         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1378                                  device_dir,
1379                                  &acpi_video_device_state_fops,
1380                                  acpi_driver_data(device));
1381         if (!entry)
1382                 goto err_remove_info;
1383
1384         /* 'brightness' [R/W] */
1385         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1386                                  device_dir,
1387                                  &acpi_video_device_brightness_fops,
1388                                  acpi_driver_data(device));
1389         if (!entry)
1390                 goto err_remove_state;
1391
1392         /* 'EDID' [R] */
1393         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1394                                  &acpi_video_device_EDID_fops,
1395                                  acpi_driver_data(device));
1396         if (!entry)
1397                 goto err_remove_brightness;
1398
1399         acpi_device_dir(device) = device_dir;
1400
1401         return 0;
1402
1403  err_remove_brightness:
1404         remove_proc_entry("brightness", device_dir);
1405  err_remove_state:
1406         remove_proc_entry("state", device_dir);
1407  err_remove_info:
1408         remove_proc_entry("info", device_dir);
1409  err_remove_dir:
1410         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1411         return -ENOMEM;
1412 }
1413
1414 static int acpi_video_device_remove_fs(struct acpi_device *device)
1415 {
1416         struct acpi_video_device *vid_dev;
1417         struct proc_dir_entry *device_dir;
1418
1419         vid_dev = acpi_driver_data(device);
1420         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1421                 return -ENODEV;
1422
1423         device_dir = acpi_device_dir(device);
1424         if (device_dir) {
1425                 remove_proc_entry("info", device_dir);
1426                 remove_proc_entry("state", device_dir);
1427                 remove_proc_entry("brightness", device_dir);
1428                 remove_proc_entry("EDID", device_dir);
1429                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1430                 acpi_device_dir(device) = NULL;
1431         }
1432
1433         return 0;
1434 }
1435
1436 /* video bus */
1437 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1438 {
1439         struct acpi_video_bus *video = seq->private;
1440
1441
1442         if (!video)
1443                 goto end;
1444
1445         seq_printf(seq, "Switching heads:              %s\n",
1446                    video->flags.multihead ? "yes" : "no");
1447         seq_printf(seq, "Video ROM:                    %s\n",
1448                    video->flags.rom ? "yes" : "no");
1449         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1450                    video->flags.post ? "yes" : "no");
1451
1452       end:
1453         return 0;
1454 }
1455
1456 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1457 {
1458         return single_open(file, acpi_video_bus_info_seq_show,
1459                            PDE(inode)->data);
1460 }
1461
1462 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1463 {
1464         struct acpi_video_bus *video = seq->private;
1465
1466
1467         if (!video)
1468                 goto end;
1469
1470         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1471         seq_printf(seq, "<TODO>\n");
1472
1473       end:
1474         return 0;
1475 }
1476
1477 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1478 {
1479         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1480 }
1481
1482 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1483 {
1484         struct acpi_video_bus *video = seq->private;
1485         unsigned long long options;
1486         int status;
1487
1488
1489         if (!video)
1490                 goto end;
1491
1492         status = acpi_video_bus_POST_options(video, &options);
1493         if (ACPI_SUCCESS(status)) {
1494                 if (!(options & 1)) {
1495                         printk(KERN_WARNING PREFIX
1496                                "The motherboard VGA device is not listed as a possible POST device.\n");
1497                         printk(KERN_WARNING PREFIX
1498                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1499                 }
1500                 printk(KERN_WARNING "%llx\n", options);
1501                 seq_printf(seq, "can POST: <integrated video>");
1502                 if (options & 2)
1503                         seq_printf(seq, " <PCI video>");
1504                 if (options & 4)
1505                         seq_printf(seq, " <AGP video>");
1506                 seq_putc(seq, '\n');
1507         } else
1508                 seq_printf(seq, "<not supported>\n");
1509       end:
1510         return 0;
1511 }
1512
1513 static int
1514 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1515 {
1516         return single_open(file, acpi_video_bus_POST_info_seq_show,
1517                            PDE(inode)->data);
1518 }
1519
1520 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1521 {
1522         struct acpi_video_bus *video = seq->private;
1523         int status;
1524         unsigned long long id;
1525
1526
1527         if (!video)
1528                 goto end;
1529
1530         status = acpi_video_bus_get_POST(video, &id);
1531         if (!ACPI_SUCCESS(status)) {
1532                 seq_printf(seq, "<not supported>\n");
1533                 goto end;
1534         }
1535         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1536
1537       end:
1538         return 0;
1539 }
1540
1541 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1542 {
1543         struct acpi_video_bus *video = seq->private;
1544
1545
1546         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1547
1548         return 0;
1549 }
1550
1551 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1552 {
1553         return single_open(file, acpi_video_bus_POST_seq_show,
1554                            PDE(inode)->data);
1555 }
1556
1557 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1558 {
1559         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1560 }
1561
1562 static ssize_t
1563 acpi_video_bus_write_POST(struct file *file,
1564                           const char __user * buffer,
1565                           size_t count, loff_t * data)
1566 {
1567         int status;
1568         struct seq_file *m = file->private_data;
1569         struct acpi_video_bus *video = m->private;
1570         char str[12] = { 0 };
1571         unsigned long long opt, options;
1572
1573
1574         if (!video || count >= sizeof(str))
1575                 return -EINVAL;
1576
1577         status = acpi_video_bus_POST_options(video, &options);
1578         if (!ACPI_SUCCESS(status))
1579                 return -EINVAL;
1580
1581         if (copy_from_user(str, buffer, count))
1582                 return -EFAULT;
1583
1584         str[count] = 0;
1585         opt = strtoul(str, NULL, 0);
1586         if (opt > 3)
1587                 return -EFAULT;
1588
1589         /* just in case an OEM 'forgot' the motherboard... */
1590         options |= 1;
1591
1592         if (options & (1ul << opt)) {
1593                 status = acpi_video_bus_set_POST(video, opt);
1594                 if (!ACPI_SUCCESS(status))
1595                         return -EFAULT;
1596
1597         }
1598
1599         return count;
1600 }
1601
1602 static ssize_t
1603 acpi_video_bus_write_DOS(struct file *file,
1604                          const char __user * buffer,
1605                          size_t count, loff_t * data)
1606 {
1607         int status;
1608         struct seq_file *m = file->private_data;
1609         struct acpi_video_bus *video = m->private;
1610         char str[12] = { 0 };
1611         unsigned long opt;
1612
1613
1614         if (!video || count >= sizeof(str))
1615                 return -EINVAL;
1616
1617         if (copy_from_user(str, buffer, count))
1618                 return -EFAULT;
1619
1620         str[count] = 0;
1621         opt = strtoul(str, NULL, 0);
1622         if (opt > 7)
1623                 return -EFAULT;
1624
1625         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1626
1627         if (!ACPI_SUCCESS(status))
1628                 return -EFAULT;
1629
1630         return count;
1631 }
1632
1633 static int acpi_video_bus_add_fs(struct acpi_device *device)
1634 {
1635         struct acpi_video_bus *video = acpi_driver_data(device);
1636         struct proc_dir_entry *device_dir;
1637         struct proc_dir_entry *entry;
1638
1639         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1640         if (!device_dir)
1641                 return -ENOMEM;
1642
1643         /* 'info' [R] */
1644         entry = proc_create_data("info", S_IRUGO, device_dir,
1645                                  &acpi_video_bus_info_fops,
1646                                  acpi_driver_data(device));
1647         if (!entry)
1648                 goto err_remove_dir;
1649
1650         /* 'ROM' [R] */
1651         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1652                                  &acpi_video_bus_ROM_fops,
1653                                  acpi_driver_data(device));
1654         if (!entry)
1655                 goto err_remove_info;
1656
1657         /* 'POST_info' [R] */
1658         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1659                                  &acpi_video_bus_POST_info_fops,
1660                                  acpi_driver_data(device));
1661         if (!entry)
1662                 goto err_remove_rom;
1663
1664         /* 'POST' [R/W] */
1665         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1666                                  device_dir,
1667                                  &acpi_video_bus_POST_fops,
1668                                  acpi_driver_data(device));
1669         if (!entry)
1670                 goto err_remove_post_info;
1671
1672         /* 'DOS' [R/W] */
1673         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1674                                  device_dir,
1675                                  &acpi_video_bus_DOS_fops,
1676                                  acpi_driver_data(device));
1677         if (!entry)
1678                 goto err_remove_post;
1679
1680         video->dir = acpi_device_dir(device) = device_dir;
1681         return 0;
1682
1683  err_remove_post:
1684         remove_proc_entry("POST", device_dir);
1685  err_remove_post_info:
1686         remove_proc_entry("POST_info", device_dir);
1687  err_remove_rom:
1688         remove_proc_entry("ROM", device_dir);
1689  err_remove_info:
1690         remove_proc_entry("info", device_dir);
1691  err_remove_dir:
1692         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1693         return -ENOMEM;
1694 }
1695
1696 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1697 {
1698         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1699
1700         if (device_dir) {
1701                 remove_proc_entry("info", device_dir);
1702                 remove_proc_entry("ROM", device_dir);
1703                 remove_proc_entry("POST_info", device_dir);
1704                 remove_proc_entry("POST", device_dir);
1705                 remove_proc_entry("DOS", device_dir);
1706                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1707                 acpi_device_dir(device) = NULL;
1708         }
1709
1710         return 0;
1711 }
1712
1713 /* --------------------------------------------------------------------------
1714                                  Driver Interface
1715    -------------------------------------------------------------------------- */
1716
1717 /* device interface */
1718 static struct acpi_video_device_attrib*
1719 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1720 {
1721         struct acpi_video_enumerated_device *ids;
1722         int i;
1723
1724         for (i = 0; i < video->attached_count; i++) {
1725                 ids = &video->attached_array[i];
1726                 if ((ids->value.int_val & 0xffff) == device_id)
1727                         return &ids->value.attrib;
1728         }
1729
1730         return NULL;
1731 }
1732
1733 static int
1734 acpi_video_bus_get_one_device(struct acpi_device *device,
1735                               struct acpi_video_bus *video)
1736 {
1737         unsigned long long device_id;
1738         int status;
1739         struct acpi_video_device *data;
1740         struct acpi_video_device_attrib* attribute;
1741
1742         if (!device || !video)
1743                 return -EINVAL;
1744
1745         status =
1746             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1747         if (ACPI_SUCCESS(status)) {
1748
1749                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1750                 if (!data)
1751                         return -ENOMEM;
1752
1753                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1754                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1755                 device->driver_data = data;
1756
1757                 data->device_id = device_id;
1758                 data->video = video;
1759                 data->dev = device;
1760
1761                 attribute = acpi_video_get_device_attr(video, device_id);
1762
1763                 if((attribute != NULL) && attribute->device_id_scheme) {
1764                         switch (attribute->display_type) {
1765                         case ACPI_VIDEO_DISPLAY_CRT:
1766                                 data->flags.crt = 1;
1767                                 break;
1768                         case ACPI_VIDEO_DISPLAY_TV:
1769                                 data->flags.tvout = 1;
1770                                 break;
1771                         case ACPI_VIDEO_DISPLAY_DVI:
1772                                 data->flags.dvi = 1;
1773                                 break;
1774                         case ACPI_VIDEO_DISPLAY_LCD:
1775                                 data->flags.lcd = 1;
1776                                 break;
1777                         default:
1778                                 data->flags.unknown = 1;
1779                                 break;
1780                         }
1781                         if(attribute->bios_can_detect)
1782                                 data->flags.bios = 1;
1783                 } else
1784                         data->flags.unknown = 1;
1785
1786                 acpi_video_device_bind(video, data);
1787                 acpi_video_device_find_cap(data);
1788
1789                 status = acpi_install_notify_handler(device->handle,
1790                                                      ACPI_DEVICE_NOTIFY,
1791                                                      acpi_video_device_notify,
1792                                                      data);
1793                 if (ACPI_FAILURE(status)) {
1794                         printk(KERN_ERR PREFIX
1795                                           "Error installing notify handler\n");
1796                         if(data->brightness)
1797                                 kfree(data->brightness->levels);
1798                         kfree(data->brightness);
1799                         kfree(data);
1800                         return -ENODEV;
1801                 }
1802
1803                 mutex_lock(&video->device_list_lock);
1804                 list_add_tail(&data->entry, &video->video_device_list);
1805                 mutex_unlock(&video->device_list_lock);
1806
1807                 acpi_video_device_add_fs(device);
1808
1809                 return 0;
1810         }
1811
1812         return -ENOENT;
1813 }
1814
1815 /*
1816  *  Arg:
1817  *      video   : video bus device
1818  *
1819  *  Return:
1820  *      none
1821  *
1822  *  Enumerate the video device list of the video bus,
1823  *  bind the ids with the corresponding video devices
1824  *  under the video bus.
1825  */
1826
1827 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1828 {
1829         struct acpi_video_device *dev;
1830
1831         mutex_lock(&video->device_list_lock);
1832
1833         list_for_each_entry(dev, &video->video_device_list, entry)
1834                 acpi_video_device_bind(video, dev);
1835
1836         mutex_unlock(&video->device_list_lock);
1837 }
1838
1839 /*
1840  *  Arg:
1841  *      video   : video bus device
1842  *      device  : video output device under the video
1843  *              bus
1844  *
1845  *  Return:
1846  *      none
1847  *
1848  *  Bind the ids with the corresponding video devices
1849  *  under the video bus.
1850  */
1851
1852 static void
1853 acpi_video_device_bind(struct acpi_video_bus *video,
1854                        struct acpi_video_device *device)
1855 {
1856         struct acpi_video_enumerated_device *ids;
1857         int i;
1858
1859         for (i = 0; i < video->attached_count; i++) {
1860                 ids = &video->attached_array[i];
1861                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1862                         ids->bind_info = device;
1863                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1864                 }
1865         }
1866 }
1867
1868 /*
1869  *  Arg:
1870  *      video   : video bus device
1871  *
1872  *  Return:
1873  *      < 0     : error
1874  *
1875  *  Call _DOD to enumerate all devices attached to display adapter
1876  *
1877  */
1878
1879 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1880 {
1881         int status;
1882         int count;
1883         int i;
1884         struct acpi_video_enumerated_device *active_list;
1885         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1886         union acpi_object *dod = NULL;
1887         union acpi_object *obj;
1888
1889         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1890         if (!ACPI_SUCCESS(status)) {
1891                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1892                 return status;
1893         }
1894
1895         dod = buffer.pointer;
1896         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1897                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1898                 status = -EFAULT;
1899                 goto out;
1900         }
1901
1902         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1903                           dod->package.count));
1904
1905         active_list = kcalloc(1 + dod->package.count,
1906                               sizeof(struct acpi_video_enumerated_device),
1907                               GFP_KERNEL);
1908         if (!active_list) {
1909                 status = -ENOMEM;
1910                 goto out;
1911         }
1912
1913         count = 0;
1914         for (i = 0; i < dod->package.count; i++) {
1915                 obj = &dod->package.elements[i];
1916
1917                 if (obj->type != ACPI_TYPE_INTEGER) {
1918                         printk(KERN_ERR PREFIX
1919                                 "Invalid _DOD data in element %d\n", i);
1920                         continue;
1921                 }
1922
1923                 active_list[count].value.int_val = obj->integer.value;
1924                 active_list[count].bind_info = NULL;
1925                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1926                                   (int)obj->integer.value));
1927                 count++;
1928         }
1929
1930         kfree(video->attached_array);
1931
1932         video->attached_array = active_list;
1933         video->attached_count = count;
1934
1935  out:
1936         kfree(buffer.pointer);
1937         return status;
1938 }
1939
1940 static int
1941 acpi_video_get_next_level(struct acpi_video_device *device,
1942                           u32 level_current, u32 event)
1943 {
1944         int min, max, min_above, max_below, i, l, delta = 255;
1945         max = max_below = 0;
1946         min = min_above = 255;
1947         /* Find closest level to level_current */
1948         for (i = 2; i < device->brightness->count; i++) {
1949                 l = device->brightness->levels[i];
1950                 if (abs(l - level_current) < abs(delta)) {
1951                         delta = l - level_current;
1952                         if (!delta)
1953                                 break;
1954                 }
1955         }
1956         /* Ajust level_current to closest available level */
1957         level_current += delta;
1958         for (i = 2; i < device->brightness->count; i++) {
1959                 l = device->brightness->levels[i];
1960                 if (l < min)
1961                         min = l;
1962                 if (l > max)
1963                         max = l;
1964                 if (l < min_above && l > level_current)
1965                         min_above = l;
1966                 if (l > max_below && l < level_current)
1967                         max_below = l;
1968         }
1969
1970         switch (event) {
1971         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1972                 return (level_current < max) ? min_above : min;
1973         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1974                 return (level_current < max) ? min_above : max;
1975         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1976                 return (level_current > min) ? max_below : min;
1977         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1978         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1979                 return 0;
1980         default:
1981                 return level_current;
1982         }
1983 }
1984
1985 static int
1986 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1987 {
1988         unsigned long long level_current, level_next;
1989         int result = -EINVAL;
1990
1991         /* no warning message if acpi_backlight=vendor is used */
1992         if (!acpi_video_backlight_support())
1993                 return 0;
1994
1995         if (!device->brightness)
1996                 goto out;
1997
1998         result = acpi_video_device_lcd_get_level_current(device,
1999                                                          &level_current);
2000         if (result)
2001                 goto out;
2002
2003         level_next = acpi_video_get_next_level(device, level_current, event);
2004
2005         result = acpi_video_device_lcd_set_level(device, level_next);
2006
2007         if (!result)
2008                 backlight_force_update(device->backlight,
2009                                        BACKLIGHT_UPDATE_HOTKEY);
2010
2011 out:
2012         if (result)
2013                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2014
2015         return result;
2016 }
2017
2018 static int
2019 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2020                            struct acpi_device *device)
2021 {
2022         int status = 0;
2023         struct acpi_device *dev;
2024
2025         acpi_video_device_enumerate(video);
2026
2027         list_for_each_entry(dev, &device->children, node) {
2028
2029                 status = acpi_video_bus_get_one_device(dev, video);
2030                 if (ACPI_FAILURE(status)) {
2031                         printk(KERN_WARNING PREFIX
2032                                         "Cant attach device");
2033                         continue;
2034                 }
2035         }
2036         return status;
2037 }
2038
2039 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2040 {
2041         acpi_status status;
2042         struct acpi_video_bus *video;
2043
2044
2045         if (!device || !device->video)
2046                 return -ENOENT;
2047
2048         video = device->video;
2049
2050         acpi_video_device_remove_fs(device->dev);
2051
2052         status = acpi_remove_notify_handler(device->dev->handle,
2053                                             ACPI_DEVICE_NOTIFY,
2054                                             acpi_video_device_notify);
2055         if (device->backlight) {
2056                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2057                 backlight_device_unregister(device->backlight);
2058                 device->backlight = NULL;
2059         }
2060         if (device->cooling_dev) {
2061                 sysfs_remove_link(&device->dev->dev.kobj,
2062                                   "thermal_cooling");
2063                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2064                                   "device");
2065                 thermal_cooling_device_unregister(device->cooling_dev);
2066                 device->cooling_dev = NULL;
2067         }
2068         video_output_unregister(device->output_dev);
2069
2070         return 0;
2071 }
2072
2073 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2074 {
2075         int status;
2076         struct acpi_video_device *dev, *next;
2077
2078         mutex_lock(&video->device_list_lock);
2079
2080         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2081
2082                 status = acpi_video_bus_put_one_device(dev);
2083                 if (ACPI_FAILURE(status))
2084                         printk(KERN_WARNING PREFIX
2085                                "hhuuhhuu bug in acpi video driver.\n");
2086
2087                 if (dev->brightness) {
2088                         kfree(dev->brightness->levels);
2089                         kfree(dev->brightness);
2090                 }
2091                 list_del(&dev->entry);
2092                 kfree(dev);
2093         }
2094
2095         mutex_unlock(&video->device_list_lock);
2096
2097         return 0;
2098 }
2099
2100 /* acpi_video interface */
2101
2102 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2103 {
2104         return acpi_video_bus_DOS(video, 0, 0);
2105 }
2106
2107 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2108 {
2109         return acpi_video_bus_DOS(video, 0, 1);
2110 }
2111
2112 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2113 {
2114         struct acpi_video_bus *video = acpi_driver_data(device);
2115         struct input_dev *input;
2116         int keycode;
2117
2118         if (!video)
2119                 return;
2120
2121         input = video->input;
2122
2123         switch (event) {
2124         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2125                                          * most likely via hotkey. */
2126                 acpi_bus_generate_proc_event(device, event, 0);
2127                 keycode = KEY_SWITCHVIDEOMODE;
2128                 break;
2129
2130         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2131                                          * connector. */
2132                 acpi_video_device_enumerate(video);
2133                 acpi_video_device_rebind(video);
2134                 acpi_bus_generate_proc_event(device, event, 0);
2135                 keycode = KEY_SWITCHVIDEOMODE;
2136                 break;
2137
2138         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2139                 acpi_bus_generate_proc_event(device, event, 0);
2140                 keycode = KEY_SWITCHVIDEOMODE;
2141                 break;
2142         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2143                 acpi_bus_generate_proc_event(device, event, 0);
2144                 keycode = KEY_VIDEO_NEXT;
2145                 break;
2146         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2147                 acpi_bus_generate_proc_event(device, event, 0);
2148                 keycode = KEY_VIDEO_PREV;
2149                 break;
2150
2151         default:
2152                 keycode = KEY_UNKNOWN;
2153                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2154                                   "Unsupported event [0x%x]\n", event));
2155                 break;
2156         }
2157
2158         acpi_notifier_call_chain(device, event, 0);
2159         input_report_key(input, keycode, 1);
2160         input_sync(input);
2161         input_report_key(input, keycode, 0);
2162         input_sync(input);
2163
2164         return;
2165 }
2166
2167 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2168 {
2169         struct acpi_video_device *video_device = data;
2170         struct acpi_device *device = NULL;
2171         struct acpi_video_bus *bus;
2172         struct input_dev *input;
2173         int keycode;
2174
2175         if (!video_device)
2176                 return;
2177
2178         device = video_device->dev;
2179         bus = video_device->video;
2180         input = bus->input;
2181
2182         switch (event) {
2183         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2184                 if (brightness_switch_enabled)
2185                         acpi_video_switch_brightness(video_device, event);
2186                 acpi_bus_generate_proc_event(device, event, 0);
2187                 keycode = KEY_BRIGHTNESS_CYCLE;
2188                 break;
2189         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2190                 if (brightness_switch_enabled)
2191                         acpi_video_switch_brightness(video_device, event);
2192                 acpi_bus_generate_proc_event(device, event, 0);
2193                 keycode = KEY_BRIGHTNESSUP;
2194                 break;
2195         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2196                 if (brightness_switch_enabled)
2197                         acpi_video_switch_brightness(video_device, event);
2198                 acpi_bus_generate_proc_event(device, event, 0);
2199                 keycode = KEY_BRIGHTNESSDOWN;
2200                 break;
2201         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2202                 if (brightness_switch_enabled)
2203                         acpi_video_switch_brightness(video_device, event);
2204                 acpi_bus_generate_proc_event(device, event, 0);
2205                 keycode = KEY_BRIGHTNESS_ZERO;
2206                 break;
2207         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2208                 if (brightness_switch_enabled)
2209                         acpi_video_switch_brightness(video_device, event);
2210                 acpi_bus_generate_proc_event(device, event, 0);
2211                 keycode = KEY_DISPLAY_OFF;
2212                 break;
2213         default:
2214                 keycode = KEY_UNKNOWN;
2215                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2216                                   "Unsupported event [0x%x]\n", event));
2217                 break;
2218         }
2219
2220         acpi_notifier_call_chain(device, event, 0);
2221         input_report_key(input, keycode, 1);
2222         input_sync(input);
2223         input_report_key(input, keycode, 0);
2224         input_sync(input);
2225
2226         return;
2227 }
2228
2229 static int instance;
2230 static int acpi_video_resume(struct acpi_device *device)
2231 {
2232         struct acpi_video_bus *video;
2233         struct acpi_video_device *video_device;
2234         int i;
2235
2236         if (!device || !acpi_driver_data(device))
2237                 return -EINVAL;
2238
2239         video = acpi_driver_data(device);
2240
2241         for (i = 0; i < video->attached_count; i++) {
2242                 video_device = video->attached_array[i].bind_info;
2243                 if (video_device && video_device->backlight)
2244                         acpi_video_set_brightness(video_device->backlight);
2245         }
2246         return AE_OK;
2247 }
2248
2249 static acpi_status
2250 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2251                         void **return_value)
2252 {
2253         struct acpi_device *device = context;
2254         struct acpi_device *sibling;
2255         int result;
2256
2257         if (handle == device->handle)
2258                 return AE_CTRL_TERMINATE;
2259
2260         result = acpi_bus_get_device(handle, &sibling);
2261         if (result)
2262                 return AE_OK;
2263
2264         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2265                         return AE_ALREADY_EXISTS;
2266
2267         return AE_OK;
2268 }
2269
2270 static int acpi_video_bus_add(struct acpi_device *device)
2271 {
2272         struct acpi_video_bus *video;
2273         struct input_dev *input;
2274         int error;
2275         acpi_status status;
2276
2277         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2278                                 device->parent->handle, 1,
2279                                 acpi_video_bus_match, NULL,
2280                                 device, NULL);
2281         if (status == AE_ALREADY_EXISTS) {
2282                 printk(KERN_WARNING FW_BUG
2283                         "Duplicate ACPI video bus devices for the"
2284                         " same VGA controller, please try module "
2285                         "parameter \"video.allow_duplicates=1\""
2286                         "if the current driver doesn't work.\n");
2287                 if (!allow_duplicates)
2288                         return -ENODEV;
2289         }
2290
2291         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2292         if (!video)
2293                 return -ENOMEM;
2294
2295         /* a hack to fix the duplicate name "VID" problem on T61 */
2296         if (!strcmp(device->pnp.bus_id, "VID")) {
2297                 if (instance)
2298                         device->pnp.bus_id[3] = '0' + instance;
2299                 instance ++;
2300         }
2301         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2302         if (!strcmp(device->pnp.bus_id, "VGA")) {
2303                 if (instance)
2304                         device->pnp.bus_id[3] = '0' + instance;
2305                 instance++;
2306         }
2307
2308         video->device = device;
2309         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2310         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2311         device->driver_data = video;
2312
2313         acpi_video_bus_find_cap(video);
2314         error = acpi_video_bus_check(video);
2315         if (error)
2316                 goto err_free_video;
2317
2318         error = acpi_video_bus_add_fs(device);
2319         if (error)
2320                 goto err_free_video;
2321
2322         mutex_init(&video->device_list_lock);
2323         INIT_LIST_HEAD(&video->video_device_list);
2324
2325         acpi_video_bus_get_devices(video, device);
2326         acpi_video_bus_start_devices(video);
2327
2328         video->input = input = input_allocate_device();
2329         if (!input) {
2330                 error = -ENOMEM;
2331                 goto err_stop_video;
2332         }
2333
2334         snprintf(video->phys, sizeof(video->phys),
2335                 "%s/video/input0", acpi_device_hid(video->device));
2336
2337         input->name = acpi_device_name(video->device);
2338         input->phys = video->phys;
2339         input->id.bustype = BUS_HOST;
2340         input->id.product = 0x06;
2341         input->dev.parent = &device->dev;
2342         input->evbit[0] = BIT(EV_KEY);
2343         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2344         set_bit(KEY_VIDEO_NEXT, input->keybit);
2345         set_bit(KEY_VIDEO_PREV, input->keybit);
2346         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2347         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2348         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2349         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2350         set_bit(KEY_DISPLAY_OFF, input->keybit);
2351         set_bit(KEY_UNKNOWN, input->keybit);
2352
2353         error = input_register_device(input);
2354         if (error)
2355                 goto err_free_input_dev;
2356
2357         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2358                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2359                video->flags.multihead ? "yes" : "no",
2360                video->flags.rom ? "yes" : "no",
2361                video->flags.post ? "yes" : "no");
2362
2363         return 0;
2364
2365  err_free_input_dev:
2366         input_free_device(input);
2367  err_stop_video:
2368         acpi_video_bus_stop_devices(video);
2369         acpi_video_bus_put_devices(video);
2370         kfree(video->attached_array);
2371         acpi_video_bus_remove_fs(device);
2372  err_free_video:
2373         kfree(video);
2374         device->driver_data = NULL;
2375
2376         return error;
2377 }
2378
2379 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2380 {
2381         struct acpi_video_bus *video = NULL;
2382
2383
2384         if (!device || !acpi_driver_data(device))
2385                 return -EINVAL;
2386
2387         video = acpi_driver_data(device);
2388
2389         acpi_video_bus_stop_devices(video);
2390         acpi_video_bus_put_devices(video);
2391         acpi_video_bus_remove_fs(device);
2392
2393         input_unregister_device(video->input);
2394         kfree(video->attached_array);
2395         kfree(video);
2396
2397         return 0;
2398 }
2399
2400 static int __init intel_opregion_present(void)
2401 {
2402 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2403         struct pci_dev *dev = NULL;
2404         u32 address;
2405
2406         for_each_pci_dev(dev) {
2407                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2408                         continue;
2409                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2410                         continue;
2411                 pci_read_config_dword(dev, 0xfc, &address);
2412                 if (!address)
2413                         continue;
2414                 return 1;
2415         }
2416 #endif
2417         return 0;
2418 }
2419
2420 int acpi_video_register(void)
2421 {
2422         int result = 0;
2423         if (register_count) {
2424                 /*
2425                  * if the function of acpi_video_register is already called,
2426                  * don't register the acpi_vide_bus again and return no error.
2427                  */
2428                 return 0;
2429         }
2430
2431         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2432         if (!acpi_video_dir)
2433                 return -ENODEV;
2434
2435         result = acpi_bus_register_driver(&acpi_video_bus);
2436         if (result < 0) {
2437                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2438                 return -ENODEV;
2439         }
2440
2441         /*
2442          * When the acpi_video_bus is loaded successfully, increase
2443          * the counter reference.
2444          */
2445         register_count = 1;
2446
2447         return 0;
2448 }
2449 EXPORT_SYMBOL(acpi_video_register);
2450
2451 void acpi_video_unregister(void)
2452 {
2453         if (!register_count) {
2454                 /*
2455                  * If the acpi video bus is already unloaded, don't
2456                  * unload it again and return directly.
2457                  */
2458                 return;
2459         }
2460         acpi_bus_unregister_driver(&acpi_video_bus);
2461
2462         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2463
2464         register_count = 0;
2465
2466         return;
2467 }
2468 EXPORT_SYMBOL(acpi_video_unregister);
2469
2470 /*
2471  * This is kind of nasty. Hardware using Intel chipsets may require
2472  * the video opregion code to be run first in order to initialise
2473  * state before any ACPI video calls are made. To handle this we defer
2474  * registration of the video class until the opregion code has run.
2475  */
2476
2477 static int __init acpi_video_init(void)
2478 {
2479         dmi_check_system(video_dmi_table);
2480
2481         if (intel_opregion_present())
2482                 return 0;
2483
2484         return acpi_video_register();
2485 }
2486
2487 static void __exit acpi_video_exit(void)
2488 {
2489         acpi_video_unregister();
2490
2491         return;
2492 }
2493
2494 module_init(acpi_video_init);
2495 module_exit(acpi_video_exit);