drivers/acpi/video.c

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