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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
  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 };
 567
 568 static int
 569 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 570                                         unsigned long long *level)
 571 {
 572         acpi_status status = AE_OK;
 573
 574         if (device->cap._BQC || device->cap._BCQ) {
 575                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 576
 577                 status = acpi_evaluate_integer(device->dev->handle, buf,
 578                                                 NULL, level);
 579                 if (ACPI_SUCCESS(status)) {
 580                         if (device->brightness->flags._BQC_use_index) {
 581                                 if (device->brightness->flags._BCL_reversed)
 582                                         *level = device->brightness->count
 583                                                                  - 3 - (*level);
 584                                 *level = device->brightness->levels[*level + 2];
 585
 586                         }
 587                         *level += bqc_offset_aml_bug_workaround;
 588                         device->brightness->curr = *level;
 589                         return 0;
 590                 } else {
 591                         /* Fixme:
 592                          * should we return an error or ignore this failure?
 593                          * dev->brightness->curr is a cached value which stores
 594                          * the correct current backlight level in most cases.
 595                          * ACPI video backlight still works w/ buggy _BQC.
 596                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 597                          */
 598                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 599                         device->cap._BQC = device->cap._BCQ = 0;
 600                 }
 601         }
 602
 603         *level = device->brightness->curr;
 604         return 0;
 605 }
 606
 607 static int
 608 acpi_video_device_EDID(struct acpi_video_device *device,
 609                        union acpi_object **edid, ssize_t length)
 610 {
 611         int status;
 612         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 613         union acpi_object *obj;
 614         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 615         struct acpi_object_list args = { 1, &arg0 };
 616
 617
 618         *edid = NULL;
 619
 620         if (!device)
 621                 return -ENODEV;
 622         if (length == 128)
 623                 arg0.integer.value = 1;
 624         else if (length == 256)
 625                 arg0.integer.value = 2;
 626         else
 627                 return -EINVAL;
 628
 629         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 630         if (ACPI_FAILURE(status))
 631                 return -ENODEV;
 632
 633         obj = buffer.pointer;
 634
 635         if (obj && obj->type == ACPI_TYPE_BUFFER)
 636                 *edid = obj;
 637         else {
 638                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 639                 status = -EFAULT;
 640                 kfree(obj);
 641         }
 642
 643         return status;
 644 }
 645
 646 /* bus */
 647
 648 static int
 649 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 650 {
 651         int status;
 652         unsigned long long tmp;
 653         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 654         struct acpi_object_list args = { 1, &arg0 };
 655
 656
 657         arg0.integer.value = option;
 658
 659         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 660         if (ACPI_SUCCESS(status))
 661                 status = tmp ? (-EINVAL) : (AE_OK);
 662
 663         return status;
 664 }
 665
 666 static int
 667 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 668 {
 669         int status;
 670
 671         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 672
 673         return status;
 674 }
 675
 676 static int
 677 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 678                             unsigned long long *options)
 679 {
 680         int status;
 681
 682         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 683         *options &= 3;
 684
 685         return status;
 686 }
 687
 688 /*
 689  *  Arg:
 690  *      video           : video bus device pointer
 691  *      bios_flag       :
 692  *              0.      The system BIOS should NOT automatically switch(toggle)
 693  *                      the active display output.
 694  *              1.      The system BIOS should automatically switch (toggle) the
 695  *                      active display output. No switch event.
 696  *              2.      The _DGS value should be locked.
 697  *              3.      The system BIOS should not automatically switch (toggle) the
 698  *                      active display output, but instead generate the display switch
 699  *                      event notify code.
 700  *      lcd_flag        :
 701  *              0.      The system BIOS should automatically control the brightness level
 702  *                      of the LCD when the power changes from AC to DC
 703  *              1.      The system BIOS should NOT automatically control the brightness
 704  *                      level of the LCD when the power changes from AC to DC.
 705  * Return Value:
 706  *              -1      wrong arg.
 707  */
 708
 709 static int
 710 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 711 {
 712         acpi_integer status = 0;
 713         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 714         struct acpi_object_list args = { 1, &arg0 };
 715
 716
 717         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 718                 status = -1;
 719                 goto Failed;
 720         }
 721         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 722         video->dos_setting = arg0.integer.value;
 723         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 724
 725       Failed:
 726         return status;
 727 }
 728
 729 /*
 730  * Simple comparison function used to sort backlight levels.
 731  */
 732
 733 static int
 734 acpi_video_cmp_level(const void *a, const void *b)
 735 {
 736         return *(int *)a - *(int *)b;
 737 }
 738
 739 /*
 740  *  Arg:
 741  *      device  : video output device (LCD, CRT, ..)
 742  *
 743  *  Return Value:
 744  *      Maximum brightness level
 745  *
 746  *  Allocate and initialize device->brightness.
 747  */
 748
 749 static int
 750 acpi_video_init_brightness(struct acpi_video_device *device)
 751 {
 752         union acpi_object *obj = NULL;
 753         int i, max_level = 0, count = 0, level_ac_battery = 0;
 754         unsigned long long level, level_old;
 755         union acpi_object *o;
 756         struct acpi_video_device_brightness *br = NULL;
 757         int result = -EINVAL;
 758
 759         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 760                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 761                                                 "LCD brightness level\n"));
 762                 goto out;
 763         }
 764
 765         if (obj->package.count < 2)
 766                 goto out;
 767
 768         br = kzalloc(sizeof(*br), GFP_KERNEL);
 769         if (!br) {
 770                 printk(KERN_ERR "can't allocate memory\n");
 771                 result = -ENOMEM;
 772                 goto out;
 773         }
 774
 775         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 776                                 GFP_KERNEL);
 777         if (!br->levels) {
 778                 result = -ENOMEM;
 779                 goto out_free;
 780         }
 781
 782         for (i = 0; i < obj->package.count; i++) {
 783                 o = (union acpi_object *)&obj->package.elements[i];
 784                 if (o->type != ACPI_TYPE_INTEGER) {
 785                         printk(KERN_ERR PREFIX "Invalid data\n");
 786                         continue;
 787                 }
 788                 br->levels[count] = (u32) o->integer.value;
 789
 790                 if (br->levels[count] > max_level)
 791                         max_level = br->levels[count];
 792                 count++;
 793         }
 794
 795         /*
 796          * some buggy BIOS don't export the levels
 797          * when machine is on AC/Battery in _BCL package.
 798          * In this case, the first two elements in _BCL packages
 799          * are also supported brightness levels that OS should take care of.
 800          */
 801         for (i = 2; i < count; i++)
 802                 if (br->levels[i] == br->levels[0] ||
 803                     br->levels[i] == br->levels[1])
 804                         level_ac_battery++;
 805
 806         if (level_ac_battery < 2) {
 807                 level_ac_battery = 2 - level_ac_battery;
 808                 br->flags._BCL_no_ac_battery_levels = 1;
 809                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 810                         br->levels[i] = br->levels[i - level_ac_battery];
 811                 count += level_ac_battery;
 812         } else if (level_ac_battery > 2)
 813                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 814
 815         /* Check if the _BCL package is in a reversed order */
 816         if (max_level == br->levels[2]) {
 817                 br->flags._BCL_reversed = 1;
 818                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 819                         acpi_video_cmp_level, NULL);
 820         } else if (max_level != br->levels[count - 1])
 821                 ACPI_ERROR((AE_INFO,
 822                             "Found unordered _BCL package\n"));
 823
 824         br->count = count;
 825         device->brightness = br;
 826
 827         /* Check the input/output of _BQC/_BCL/_BCM */
 828         if ((max_level < 100) && (max_level <= (count - 2)))
 829                 br->flags._BCL_use_index = 1;
 830
 831         /*
 832          * _BCM is always consistent with _BCL,
 833          * at least for all the laptops we have ever seen.
 834          */
 835         br->flags._BCM_use_index = br->flags._BCL_use_index;
 836
 837         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 838         br->curr = max_level;
 839         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 840         if (result)
 841                 goto out_free_levels;
 842
 843         result = acpi_video_device_lcd_set_level(device, br->curr);
 844         if (result)
 845                 goto out_free_levels;
 846
 847         result = acpi_video_device_lcd_get_level_current(device, &level);
 848         if (result)
 849                 goto out_free_levels;
 850
 851         if ((level != level_old) && !br->flags._BCM_use_index) {
 852                 /* Note:
 853                  * This piece of code does not work correctly if the current
 854                  * brightness levels is 0.
 855                  * But I guess boxes that boot with such a dark screen are rare
 856                  * and no more code is needed to cover this specifial case.
 857                  */
 858
 859                 if (level_ac_battery != 2) {
 860                         /*
 861                          * For now, we don't support the _BCL like this:
 862                          * 16, 15, 0, 1, 2, 3, ..., 14, 15, 16
 863                          * because we may mess up the index returned by _BQC.
 864                          * Plus: we have not got a box like this.
 865                          */
 866                         ACPI_ERROR((AE_INFO, "_BCL not supported\n"));
 867                 }
 868                 br->flags._BQC_use_index = 1;
 869         }
 870
 871         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 872                           "found %d brightness levels\n", count - 2));
 873         kfree(obj);
 874         return result;
 875
 876 out_free_levels:
 877         kfree(br->levels);
 878 out_free:
 879         kfree(br);
 880 out:
 881         device->brightness = NULL;
 882         kfree(obj);
 883         return result;
 884 }
 885
 886 /*
 887  *  Arg:
 888  *      device  : video output device (LCD, CRT, ..)
 889  *
 890  *  Return Value:
 891  *      None
 892  *
 893  *  Find out all required AML methods defined under the output
 894  *  device.
 895  */
 896
 897 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 898 {
 899         acpi_handle h_dummy1;
 900
 901
 902         memset(&device->cap, 0, sizeof(device->cap));
 903
 904         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 905                 device->cap._ADR = 1;
 906         }
 907         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 908                 device->cap._BCL = 1;
 909         }
 910         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 911                 device->cap._BCM = 1;
 912         }
 913         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 914                 device->cap._BQC = 1;
 915         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 916                                 &h_dummy1))) {
 917                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 918                 device->cap._BCQ = 1;
 919         }
 920
 921         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 922                 device->cap._DDC = 1;
 923         }
 924         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 925                 device->cap._DCS = 1;
 926         }
 927         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 928                 device->cap._DGS = 1;
 929         }
 930         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 931                 device->cap._DSS = 1;
 932         }
 933
 934         if (acpi_video_backlight_support()) {
 935                 int result;
 936                 static int count = 0;
 937                 char *name;
 938
 939                 result = acpi_video_init_brightness(device);
 940                 if (result)
 941                         return;
 942                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 943                 if (!name)
 944                         return;
 945
 946                 sprintf(name, "acpi_video%d", count++);
 947                 device->backlight = backlight_device_register(name,
 948                         NULL, device, &acpi_backlight_ops);
 949                 device->backlight->props.max_brightness = device->brightness->count-3;
 950                 kfree(name);
 951
 952                 device->cdev = thermal_cooling_device_register("LCD",
 953                                         device->dev, &video_cooling_ops);
 954                 if (IS_ERR(device->cdev))
 955                         return;
 956
 957                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 958                          device->cdev->id);
 959                 result = sysfs_create_link(&device->dev->dev.kobj,
 960                                 &device->cdev->device.kobj,
 961                                 "thermal_cooling");
 962                 if (result)
 963                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 964                 result = sysfs_create_link(&device->cdev->device.kobj,
 965                                 &device->dev->dev.kobj, "device");
 966                 if (result)
 967                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 968
 969         }
 970
 971         if (acpi_video_display_switch_support()) {
 972
 973                 if (device->cap._DCS && device->cap._DSS) {
 974                         static int count;
 975                         char *name;
 976                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 977                         if (!name)
 978                                 return;
 979                         sprintf(name, "acpi_video%d", count++);
 980                         device->output_dev = video_output_register(name,
 981                                         NULL, device, &acpi_output_properties);
 982                         kfree(name);
 983                 }
 984         }
 985 }
 986
 987 /*
 988  *  Arg:
 989  *      device  : video output device (VGA)
 990  *
 991  *  Return Value:
 992  *      None
 993  *
 994  *  Find out all required AML methods defined under the video bus device.
 995  */
 996
 997 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 998 {
 999         acpi_handle h_dummy1;
1000
1001         memset(&video->cap, 0, sizeof(video->cap));
1002         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1003                 video->cap._DOS = 1;
1004         }
1005         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1006                 video->cap._DOD = 1;
1007         }
1008         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1009                 video->cap._ROM = 1;
1010         }
1011         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1012                 video->cap._GPD = 1;
1013         }
1014         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1015                 video->cap._SPD = 1;
1016         }
1017         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1018                 video->cap._VPO = 1;
1019         }
1020 }
1021
1022 /*
1023  * Check whether the video bus device has required AML method to
1024  * support the desired features
1025  */
1026
1027 static int acpi_video_bus_check(struct acpi_video_bus *video)
1028 {
1029         acpi_status status = -ENOENT;
1030         struct device *dev;
1031
1032         if (!video)
1033                 return -EINVAL;
1034
1035         dev = acpi_get_physical_pci_device(video->device->handle);
1036         if (!dev)
1037                 return -ENODEV;
1038         put_device(dev);
1039
1040         /* Since there is no HID, CID and so on for VGA driver, we have
1041          * to check well known required nodes.
1042          */
1043
1044         /* Does this device support video switching? */
1045         if (video->cap._DOS) {
1046                 video->flags.multihead = 1;
1047                 status = 0;
1048         }
1049
1050         /* Does this device support retrieving a video ROM? */
1051         if (video->cap._ROM) {
1052                 video->flags.rom = 1;
1053                 status = 0;
1054         }
1055
1056         /* Does this device support configuring which video device to POST? */
1057         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1058                 video->flags.post = 1;
1059                 status = 0;
1060         }
1061
1062         return status;
1063 }
1064
1065 /* --------------------------------------------------------------------------
1066                               FS Interface (/proc)
1067    -------------------------------------------------------------------------- */
1068
1069 static struct proc_dir_entry *acpi_video_dir;
1070
1071 /* video devices */
1072
1073 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1074 {
1075         struct acpi_video_device *dev = seq->private;
1076
1077
1078         if (!dev)
1079                 goto end;
1080
1081         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1082         seq_printf(seq, "type:         ");
1083         if (dev->flags.crt)
1084                 seq_printf(seq, "CRT\n");
1085         else if (dev->flags.lcd)
1086                 seq_printf(seq, "LCD\n");
1087         else if (dev->flags.tvout)
1088                 seq_printf(seq, "TVOUT\n");
1089         else if (dev->flags.dvi)
1090                 seq_printf(seq, "DVI\n");
1091         else
1092                 seq_printf(seq, "UNKNOWN\n");
1093
1094         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1095
1096       end:
1097         return 0;
1098 }
1099
1100 static int
1101 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1102 {
1103         return single_open(file, acpi_video_device_info_seq_show,
1104                            PDE(inode)->data);
1105 }
1106
1107 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1108 {
1109         int status;
1110         struct acpi_video_device *dev = seq->private;
1111         unsigned long long state;
1112
1113
1114         if (!dev)
1115                 goto end;
1116
1117         status = acpi_video_device_get_state(dev, &state);
1118         seq_printf(seq, "state:     ");
1119         if (ACPI_SUCCESS(status))
1120                 seq_printf(seq, "0x%02llx\n", state);
1121         else
1122                 seq_printf(seq, "<not supported>\n");
1123
1124         status = acpi_video_device_query(dev, &state);
1125         seq_printf(seq, "query:     ");
1126         if (ACPI_SUCCESS(status))
1127                 seq_printf(seq, "0x%02llx\n", state);
1128         else
1129                 seq_printf(seq, "<not supported>\n");
1130
1131       end:
1132         return 0;
1133 }
1134
1135 static int
1136 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1137 {
1138         return single_open(file, acpi_video_device_state_seq_show,
1139                            PDE(inode)->data);
1140 }
1141
1142 static ssize_t
1143 acpi_video_device_write_state(struct file *file,
1144                               const char __user * buffer,
1145                               size_t count, loff_t * data)
1146 {
1147         int status;
1148         struct seq_file *m = file->private_data;
1149         struct acpi_video_device *dev = m->private;
1150         char str[12] = { 0 };
1151         u32 state = 0;
1152
1153
1154         if (!dev || count + 1 > sizeof str)
1155                 return -EINVAL;
1156
1157         if (copy_from_user(str, buffer, count))
1158                 return -EFAULT;
1159
1160         str[count] = 0;
1161         state = simple_strtoul(str, NULL, 0);
1162         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1163
1164         status = acpi_video_device_set_state(dev, state);
1165
1166         if (status)
1167                 return -EFAULT;
1168
1169         return count;
1170 }
1171
1172 static int
1173 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1174 {
1175         struct acpi_video_device *dev = seq->private;
1176         int i;
1177
1178
1179         if (!dev || !dev->brightness) {
1180                 seq_printf(seq, "<not supported>\n");
1181                 return 0;
1182         }
1183
1184         seq_printf(seq, "levels: ");
1185         for (i = 2; i < dev->brightness->count; i++)
1186                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1187         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1188
1189         return 0;
1190 }
1191
1192 static int
1193 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1194 {
1195         return single_open(file, acpi_video_device_brightness_seq_show,
1196                            PDE(inode)->data);
1197 }
1198
1199 static ssize_t
1200 acpi_video_device_write_brightness(struct file *file,
1201                                    const char __user * buffer,
1202                                    size_t count, loff_t * data)
1203 {
1204         struct seq_file *m = file->private_data;
1205         struct acpi_video_device *dev = m->private;
1206         char str[5] = { 0 };
1207         unsigned int level = 0;
1208         int i;
1209
1210
1211         if (!dev || !dev->brightness || count + 1 > sizeof str)
1212                 return -EINVAL;
1213
1214         if (copy_from_user(str, buffer, count))
1215                 return -EFAULT;
1216
1217         str[count] = 0;
1218         level = simple_strtoul(str, NULL, 0);
1219
1220         if (level > 100)
1221                 return -EFAULT;
1222
1223         /* validate through the list of available levels */
1224         for (i = 2; i < dev->brightness->count; i++)
1225                 if (level == dev->brightness->levels[i]) {
1226                         if (!acpi_video_device_lcd_set_level(dev, level))
1227                                 return count;
1228                         break;
1229                 }
1230
1231         return -EINVAL;
1232 }
1233
1234 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1235 {
1236         struct acpi_video_device *dev = seq->private;
1237         int status;
1238         int i;
1239         union acpi_object *edid = NULL;
1240
1241
1242         if (!dev)
1243                 goto out;
1244
1245         status = acpi_video_device_EDID(dev, &edid, 128);
1246         if (ACPI_FAILURE(status)) {
1247                 status = acpi_video_device_EDID(dev, &edid, 256);
1248         }
1249
1250         if (ACPI_FAILURE(status)) {
1251                 goto out;
1252         }
1253
1254         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1255                 for (i = 0; i < edid->buffer.length; i++)
1256                         seq_putc(seq, edid->buffer.pointer[i]);
1257         }
1258
1259       out:
1260         if (!edid)
1261                 seq_printf(seq, "<not supported>\n");
1262         else
1263                 kfree(edid);
1264
1265         return 0;
1266 }
1267
1268 static int
1269 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1270 {
1271         return single_open(file, acpi_video_device_EDID_seq_show,
1272                            PDE(inode)->data);
1273 }
1274
1275 static int acpi_video_device_add_fs(struct acpi_device *device)
1276 {
1277         struct proc_dir_entry *entry, *device_dir;
1278         struct acpi_video_device *vid_dev;
1279
1280         vid_dev = acpi_driver_data(device);
1281         if (!vid_dev)
1282                 return -ENODEV;
1283
1284         device_dir = proc_mkdir(acpi_device_bid(device),
1285                                 vid_dev->video->dir);
1286         if (!device_dir)
1287                 return -ENOMEM;
1288
1289         /* 'info' [R] */
1290         entry = proc_create_data("info", S_IRUGO, device_dir,
1291                         &acpi_video_device_info_fops, acpi_driver_data(device));
1292         if (!entry)
1293                 goto err_remove_dir;
1294
1295         /* 'state' [R/W] */
1296         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1297                                  device_dir,
1298                                  &acpi_video_device_state_fops,
1299                                  acpi_driver_data(device));
1300         if (!entry)
1301                 goto err_remove_info;
1302
1303         /* 'brightness' [R/W] */
1304         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1305                                  device_dir,
1306                                  &acpi_video_device_brightness_fops,
1307                                  acpi_driver_data(device));
1308         if (!entry)
1309                 goto err_remove_state;
1310
1311         /* 'EDID' [R] */
1312         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1313                                  &acpi_video_device_EDID_fops,
1314                                  acpi_driver_data(device));
1315         if (!entry)
1316                 goto err_remove_brightness;
1317
1318         acpi_device_dir(device) = device_dir;
1319
1320         return 0;
1321
1322  err_remove_brightness:
1323         remove_proc_entry("brightness", device_dir);
1324  err_remove_state:
1325         remove_proc_entry("state", device_dir);
1326  err_remove_info:
1327         remove_proc_entry("info", device_dir);
1328  err_remove_dir:
1329         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1330         return -ENOMEM;
1331 }
1332
1333 static int acpi_video_device_remove_fs(struct acpi_device *device)
1334 {
1335         struct acpi_video_device *vid_dev;
1336         struct proc_dir_entry *device_dir;
1337
1338         vid_dev = acpi_driver_data(device);
1339         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1340                 return -ENODEV;
1341
1342         device_dir = acpi_device_dir(device);
1343         if (device_dir) {
1344                 remove_proc_entry("info", device_dir);
1345                 remove_proc_entry("state", device_dir);
1346                 remove_proc_entry("brightness", device_dir);
1347                 remove_proc_entry("EDID", device_dir);
1348                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1349                 acpi_device_dir(device) = NULL;
1350         }
1351
1352         return 0;
1353 }
1354
1355 /* video bus */
1356 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1357 {
1358         struct acpi_video_bus *video = seq->private;
1359
1360
1361         if (!video)
1362                 goto end;
1363
1364         seq_printf(seq, "Switching heads:              %s\n",
1365                    video->flags.multihead ? "yes" : "no");
1366         seq_printf(seq, "Video ROM:                    %s\n",
1367                    video->flags.rom ? "yes" : "no");
1368         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1369                    video->flags.post ? "yes" : "no");
1370
1371       end:
1372         return 0;
1373 }
1374
1375 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1376 {
1377         return single_open(file, acpi_video_bus_info_seq_show,
1378                            PDE(inode)->data);
1379 }
1380
1381 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1382 {
1383         struct acpi_video_bus *video = seq->private;
1384
1385
1386         if (!video)
1387                 goto end;
1388
1389         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1390         seq_printf(seq, "<TODO>\n");
1391
1392       end:
1393         return 0;
1394 }
1395
1396 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1397 {
1398         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1399 }
1400
1401 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1402 {
1403         struct acpi_video_bus *video = seq->private;
1404         unsigned long long options;
1405         int status;
1406
1407
1408         if (!video)
1409                 goto end;
1410
1411         status = acpi_video_bus_POST_options(video, &options);
1412         if (ACPI_SUCCESS(status)) {
1413                 if (!(options & 1)) {
1414                         printk(KERN_WARNING PREFIX
1415                                "The motherboard VGA device is not listed as a possible POST device.\n");
1416                         printk(KERN_WARNING PREFIX
1417                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1418                 }
1419                 printk(KERN_WARNING "%llx\n", options);
1420                 seq_printf(seq, "can POST: <integrated video>");
1421                 if (options & 2)
1422                         seq_printf(seq, " <PCI video>");
1423                 if (options & 4)
1424                         seq_printf(seq, " <AGP video>");
1425                 seq_putc(seq, '\n');
1426         } else
1427                 seq_printf(seq, "<not supported>\n");
1428       end:
1429         return 0;
1430 }
1431
1432 static int
1433 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1434 {
1435         return single_open(file, acpi_video_bus_POST_info_seq_show,
1436                            PDE(inode)->data);
1437 }
1438
1439 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1440 {
1441         struct acpi_video_bus *video = seq->private;
1442         int status;
1443         unsigned long long id;
1444
1445
1446         if (!video)
1447                 goto end;
1448
1449         status = acpi_video_bus_get_POST(video, &id);
1450         if (!ACPI_SUCCESS(status)) {
1451                 seq_printf(seq, "<not supported>\n");
1452                 goto end;
1453         }
1454         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1455
1456       end:
1457         return 0;
1458 }
1459
1460 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1461 {
1462         struct acpi_video_bus *video = seq->private;
1463
1464
1465         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1466
1467         return 0;
1468 }
1469
1470 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1471 {
1472         return single_open(file, acpi_video_bus_POST_seq_show,
1473                            PDE(inode)->data);
1474 }
1475
1476 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1477 {
1478         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1479 }
1480
1481 static ssize_t
1482 acpi_video_bus_write_POST(struct file *file,
1483                           const char __user * buffer,
1484                           size_t count, loff_t * data)
1485 {
1486         int status;
1487         struct seq_file *m = file->private_data;
1488         struct acpi_video_bus *video = m->private;
1489         char str[12] = { 0 };
1490         unsigned long long opt, options;
1491
1492
1493         if (!video || count + 1 > sizeof str)
1494                 return -EINVAL;
1495
1496         status = acpi_video_bus_POST_options(video, &options);
1497         if (!ACPI_SUCCESS(status))
1498                 return -EINVAL;
1499
1500         if (copy_from_user(str, buffer, count))
1501                 return -EFAULT;
1502
1503         str[count] = 0;
1504         opt = strtoul(str, NULL, 0);
1505         if (opt > 3)
1506                 return -EFAULT;
1507
1508         /* just in case an OEM 'forgot' the motherboard... */
1509         options |= 1;
1510
1511         if (options & (1ul << opt)) {
1512                 status = acpi_video_bus_set_POST(video, opt);
1513                 if (!ACPI_SUCCESS(status))
1514                         return -EFAULT;
1515
1516         }
1517
1518         return count;
1519 }
1520
1521 static ssize_t
1522 acpi_video_bus_write_DOS(struct file *file,
1523                          const char __user * buffer,
1524                          size_t count, loff_t * data)
1525 {
1526         int status;
1527         struct seq_file *m = file->private_data;
1528         struct acpi_video_bus *video = m->private;
1529         char str[12] = { 0 };
1530         unsigned long opt;
1531
1532
1533         if (!video || count + 1 > sizeof str)
1534                 return -EINVAL;
1535
1536         if (copy_from_user(str, buffer, count))
1537                 return -EFAULT;
1538
1539         str[count] = 0;
1540         opt = strtoul(str, NULL, 0);
1541         if (opt > 7)
1542                 return -EFAULT;
1543
1544         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1545
1546         if (!ACPI_SUCCESS(status))
1547                 return -EFAULT;
1548
1549         return count;
1550 }
1551
1552 static int acpi_video_bus_add_fs(struct acpi_device *device)
1553 {
1554         struct acpi_video_bus *video = acpi_driver_data(device);
1555         struct proc_dir_entry *device_dir;
1556         struct proc_dir_entry *entry;
1557
1558         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1559         if (!device_dir)
1560                 return -ENOMEM;
1561
1562         /* 'info' [R] */
1563         entry = proc_create_data("info", S_IRUGO, device_dir,
1564                                  &acpi_video_bus_info_fops,
1565                                  acpi_driver_data(device));
1566         if (!entry)
1567                 goto err_remove_dir;
1568
1569         /* 'ROM' [R] */
1570         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1571                                  &acpi_video_bus_ROM_fops,
1572                                  acpi_driver_data(device));
1573         if (!entry)
1574                 goto err_remove_info;
1575
1576         /* 'POST_info' [R] */
1577         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1578                                  &acpi_video_bus_POST_info_fops,
1579                                  acpi_driver_data(device));
1580         if (!entry)
1581                 goto err_remove_rom;
1582
1583         /* 'POST' [R/W] */
1584         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1585                                  device_dir,
1586                                  &acpi_video_bus_POST_fops,
1587                                  acpi_driver_data(device));
1588         if (!entry)
1589                 goto err_remove_post_info;
1590
1591         /* 'DOS' [R/W] */
1592         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1593                                  device_dir,
1594                                  &acpi_video_bus_DOS_fops,
1595                                  acpi_driver_data(device));
1596         if (!entry)
1597                 goto err_remove_post;
1598
1599         video->dir = acpi_device_dir(device) = device_dir;
1600         return 0;
1601
1602  err_remove_post:
1603         remove_proc_entry("POST", device_dir);
1604  err_remove_post_info:
1605         remove_proc_entry("POST_info", device_dir);
1606  err_remove_rom:
1607         remove_proc_entry("ROM", device_dir);
1608  err_remove_info:
1609         remove_proc_entry("info", device_dir);
1610  err_remove_dir:
1611         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1612         return -ENOMEM;
1613 }
1614
1615 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1616 {
1617         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1618
1619         if (device_dir) {
1620                 remove_proc_entry("info", device_dir);
1621                 remove_proc_entry("ROM", device_dir);
1622                 remove_proc_entry("POST_info", device_dir);
1623                 remove_proc_entry("POST", device_dir);
1624                 remove_proc_entry("DOS", device_dir);
1625                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1626                 acpi_device_dir(device) = NULL;
1627         }
1628
1629         return 0;
1630 }
1631
1632 /* --------------------------------------------------------------------------
1633                                  Driver Interface
1634    -------------------------------------------------------------------------- */
1635
1636 /* device interface */
1637 static struct acpi_video_device_attrib*
1638 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1639 {
1640         struct acpi_video_enumerated_device *ids;
1641         int i;
1642
1643         for (i = 0; i < video->attached_count; i++) {
1644                 ids = &video->attached_array[i];
1645                 if ((ids->value.int_val & 0xffff) == device_id)
1646                         return &ids->value.attrib;
1647         }
1648
1649         return NULL;
1650 }
1651
1652 static int
1653 acpi_video_bus_get_one_device(struct acpi_device *device,
1654                               struct acpi_video_bus *video)
1655 {
1656         unsigned long long device_id;
1657         int status;
1658         struct acpi_video_device *data;
1659         struct acpi_video_device_attrib* attribute;
1660
1661         if (!device || !video)
1662                 return -EINVAL;
1663
1664         status =
1665             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1666         if (ACPI_SUCCESS(status)) {
1667
1668                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1669                 if (!data)
1670                         return -ENOMEM;
1671
1672                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1673                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1674                 device->driver_data = data;
1675
1676                 data->device_id = device_id;
1677                 data->video = video;
1678                 data->dev = device;
1679
1680                 attribute = acpi_video_get_device_attr(video, device_id);
1681
1682                 if((attribute != NULL) && attribute->device_id_scheme) {
1683                         switch (attribute->display_type) {
1684                         case ACPI_VIDEO_DISPLAY_CRT:
1685                                 data->flags.crt = 1;
1686                                 break;
1687                         case ACPI_VIDEO_DISPLAY_TV:
1688                                 data->flags.tvout = 1;
1689                                 break;
1690                         case ACPI_VIDEO_DISPLAY_DVI:
1691                                 data->flags.dvi = 1;
1692                                 break;
1693                         case ACPI_VIDEO_DISPLAY_LCD:
1694                                 data->flags.lcd = 1;
1695                                 break;
1696                         default:
1697                                 data->flags.unknown = 1;
1698                                 break;
1699                         }
1700                         if(attribute->bios_can_detect)
1701                                 data->flags.bios = 1;
1702                 } else
1703                         data->flags.unknown = 1;
1704
1705                 acpi_video_device_bind(video, data);
1706                 acpi_video_device_find_cap(data);
1707
1708                 status = acpi_install_notify_handler(device->handle,
1709                                                      ACPI_DEVICE_NOTIFY,
1710                                                      acpi_video_device_notify,
1711                                                      data);
1712                 if (ACPI_FAILURE(status)) {
1713                         printk(KERN_ERR PREFIX
1714                                           "Error installing notify handler\n");
1715                         if(data->brightness)
1716                                 kfree(data->brightness->levels);
1717                         kfree(data->brightness);
1718                         kfree(data);
1719                         return -ENODEV;
1720                 }
1721
1722                 mutex_lock(&video->device_list_lock);
1723                 list_add_tail(&data->entry, &video->video_device_list);
1724                 mutex_unlock(&video->device_list_lock);
1725
1726                 acpi_video_device_add_fs(device);
1727
1728                 return 0;
1729         }
1730
1731         return -ENOENT;
1732 }
1733
1734 /*
1735  *  Arg:
1736  *      video   : video bus device
1737  *
1738  *  Return:
1739  *      none
1740  *
1741  *  Enumerate the video device list of the video bus,
1742  *  bind the ids with the corresponding video devices
1743  *  under the video bus.
1744  */
1745
1746 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1747 {
1748         struct acpi_video_device *dev;
1749
1750         mutex_lock(&video->device_list_lock);
1751
1752         list_for_each_entry(dev, &video->video_device_list, entry)
1753                 acpi_video_device_bind(video, dev);
1754
1755         mutex_unlock(&video->device_list_lock);
1756 }
1757
1758 /*
1759  *  Arg:
1760  *      video   : video bus device
1761  *      device  : video output device under the video
1762  *              bus
1763  *
1764  *  Return:
1765  *      none
1766  *
1767  *  Bind the ids with the corresponding video devices
1768  *  under the video bus.
1769  */
1770
1771 static void
1772 acpi_video_device_bind(struct acpi_video_bus *video,
1773                        struct acpi_video_device *device)
1774 {
1775         struct acpi_video_enumerated_device *ids;
1776         int i;
1777
1778         for (i = 0; i < video->attached_count; i++) {
1779                 ids = &video->attached_array[i];
1780                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1781                         ids->bind_info = device;
1782                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1783                 }
1784         }
1785 }
1786
1787 /*
1788  *  Arg:
1789  *      video   : video bus device
1790  *
1791  *  Return:
1792  *      < 0     : error
1793  *
1794  *  Call _DOD to enumerate all devices attached to display adapter
1795  *
1796  */
1797
1798 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1799 {
1800         int status;
1801         int count;
1802         int i;
1803         struct acpi_video_enumerated_device *active_list;
1804         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1805         union acpi_object *dod = NULL;
1806         union acpi_object *obj;
1807
1808         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1809         if (!ACPI_SUCCESS(status)) {
1810                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1811                 return status;
1812         }
1813
1814         dod = buffer.pointer;
1815         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1816                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1817                 status = -EFAULT;
1818                 goto out;
1819         }
1820
1821         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1822                           dod->package.count));
1823
1824         active_list = kcalloc(1 + dod->package.count,
1825                               sizeof(struct acpi_video_enumerated_device),
1826                               GFP_KERNEL);
1827         if (!active_list) {
1828                 status = -ENOMEM;
1829                 goto out;
1830         }
1831
1832         count = 0;
1833         for (i = 0; i < dod->package.count; i++) {
1834                 obj = &dod->package.elements[i];
1835
1836                 if (obj->type != ACPI_TYPE_INTEGER) {
1837                         printk(KERN_ERR PREFIX
1838                                 "Invalid _DOD data in element %d\n", i);
1839                         continue;
1840                 }
1841
1842                 active_list[count].value.int_val = obj->integer.value;
1843                 active_list[count].bind_info = NULL;
1844                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1845                                   (int)obj->integer.value));
1846                 count++;
1847         }
1848
1849         kfree(video->attached_array);
1850
1851         video->attached_array = active_list;
1852         video->attached_count = count;
1853
1854  out:
1855         kfree(buffer.pointer);
1856         return status;
1857 }
1858
1859 static int
1860 acpi_video_get_next_level(struct acpi_video_device *device,
1861                           u32 level_current, u32 event)
1862 {
1863         int min, max, min_above, max_below, i, l, delta = 255;
1864         max = max_below = 0;
1865         min = min_above = 255;
1866         /* Find closest level to level_current */
1867         for (i = 2; i < device->brightness->count; i++) {
1868                 l = device->brightness->levels[i];
1869                 if (abs(l - level_current) < abs(delta)) {
1870                         delta = l - level_current;
1871                         if (!delta)
1872                                 break;
1873                 }
1874         }
1875         /* Ajust level_current to closest available level */
1876         level_current += delta;
1877         for (i = 2; i < device->brightness->count; i++) {
1878                 l = device->brightness->levels[i];
1879                 if (l < min)
1880                         min = l;
1881                 if (l > max)
1882                         max = l;
1883                 if (l < min_above && l > level_current)
1884                         min_above = l;
1885                 if (l > max_below && l < level_current)
1886                         max_below = l;
1887         }
1888
1889         switch (event) {
1890         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1891                 return (level_current < max) ? min_above : min;
1892         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1893                 return (level_current < max) ? min_above : max;
1894         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1895                 return (level_current > min) ? max_below : min;
1896         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1897         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1898                 return 0;
1899         default:
1900                 return level_current;
1901         }
1902 }
1903
1904 static int
1905 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1906 {
1907         unsigned long long level_current, level_next;
1908         int result = -EINVAL;
1909
1910         if (!device->brightness)
1911                 goto out;
1912
1913         result = acpi_video_device_lcd_get_level_current(device,
1914                                                          &level_current);
1915         if (result)
1916                 goto out;
1917
1918         level_next = acpi_video_get_next_level(device, level_current, event);
1919
1920         result = acpi_video_device_lcd_set_level(device, level_next);
1921
1922 out:
1923         if (result)
1924                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1925
1926         return result;
1927 }
1928
1929 static int
1930 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1931                            struct acpi_device *device)
1932 {
1933         int status = 0;
1934         struct acpi_device *dev;
1935
1936         acpi_video_device_enumerate(video);
1937
1938         list_for_each_entry(dev, &device->children, node) {
1939
1940                 status = acpi_video_bus_get_one_device(dev, video);
1941                 if (ACPI_FAILURE(status)) {
1942                         printk(KERN_WARNING PREFIX
1943                                         "Cant attach device");
1944                         continue;
1945                 }
1946         }
1947         return status;
1948 }
1949
1950 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1951 {
1952         acpi_status status;
1953         struct acpi_video_bus *video;
1954
1955
1956         if (!device || !device->video)
1957                 return -ENOENT;
1958
1959         video = device->video;
1960
1961         acpi_video_device_remove_fs(device->dev);
1962
1963         status = acpi_remove_notify_handler(device->dev->handle,
1964                                             ACPI_DEVICE_NOTIFY,
1965                                             acpi_video_device_notify);
1966         backlight_device_unregister(device->backlight);
1967         if (device->cdev) {
1968                 sysfs_remove_link(&device->dev->dev.kobj,
1969                                   "thermal_cooling");
1970                 sysfs_remove_link(&device->cdev->device.kobj,
1971                                   "device");
1972                 thermal_cooling_device_unregister(device->cdev);
1973                 device->cdev = NULL;
1974         }
1975         video_output_unregister(device->output_dev);
1976
1977         return 0;
1978 }
1979
1980 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1981 {
1982         int status;
1983         struct acpi_video_device *dev, *next;
1984
1985         mutex_lock(&video->device_list_lock);
1986
1987         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1988
1989                 status = acpi_video_bus_put_one_device(dev);
1990                 if (ACPI_FAILURE(status))
1991                         printk(KERN_WARNING PREFIX
1992                                "hhuuhhuu bug in acpi video driver.\n");
1993
1994                 if (dev->brightness) {
1995                         kfree(dev->brightness->levels);
1996                         kfree(dev->brightness);
1997                 }
1998                 list_del(&dev->entry);
1999                 kfree(dev);
2000         }
2001
2002         mutex_unlock(&video->device_list_lock);
2003
2004         return 0;
2005 }
2006
2007 /* acpi_video interface */
2008
2009 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2010 {
2011         return acpi_video_bus_DOS(video, 0, 0);
2012 }
2013
2014 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2015 {
2016         return acpi_video_bus_DOS(video, 0, 1);
2017 }
2018
2019 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2020 {
2021         struct acpi_video_bus *video = acpi_driver_data(device);
2022         struct input_dev *input;
2023         int keycode;
2024
2025         if (!video)
2026                 return;
2027
2028         input = video->input;
2029
2030         switch (event) {
2031         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2032                                          * most likely via hotkey. */
2033                 acpi_bus_generate_proc_event(device, event, 0);
2034                 keycode = KEY_SWITCHVIDEOMODE;
2035                 break;
2036
2037         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2038                                          * connector. */
2039                 acpi_video_device_enumerate(video);
2040                 acpi_video_device_rebind(video);
2041                 acpi_bus_generate_proc_event(device, event, 0);
2042                 keycode = KEY_SWITCHVIDEOMODE;
2043                 break;
2044
2045         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2046                 acpi_bus_generate_proc_event(device, event, 0);
2047                 keycode = KEY_SWITCHVIDEOMODE;
2048                 break;
2049         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2050                 acpi_bus_generate_proc_event(device, event, 0);
2051                 keycode = KEY_VIDEO_NEXT;
2052                 break;
2053         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2054                 acpi_bus_generate_proc_event(device, event, 0);
2055                 keycode = KEY_VIDEO_PREV;
2056                 break;
2057
2058         default:
2059                 keycode = KEY_UNKNOWN;
2060                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2061                                   "Unsupported event [0x%x]\n", event));
2062                 break;
2063         }
2064
2065         acpi_notifier_call_chain(device, event, 0);
2066         input_report_key(input, keycode, 1);
2067         input_sync(input);
2068         input_report_key(input, keycode, 0);
2069         input_sync(input);
2070
2071         return;
2072 }
2073
2074 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2075 {
2076         struct acpi_video_device *video_device = data;
2077         struct acpi_device *device = NULL;
2078         struct acpi_video_bus *bus;
2079         struct input_dev *input;
2080         int keycode;
2081
2082         if (!video_device)
2083                 return;
2084
2085         device = video_device->dev;
2086         bus = video_device->video;
2087         input = bus->input;
2088
2089         switch (event) {
2090         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2091                 if (brightness_switch_enabled)
2092                         acpi_video_switch_brightness(video_device, event);
2093                 acpi_bus_generate_proc_event(device, event, 0);
2094                 keycode = KEY_BRIGHTNESS_CYCLE;
2095                 break;
2096         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2097                 if (brightness_switch_enabled)
2098                         acpi_video_switch_brightness(video_device, event);
2099                 acpi_bus_generate_proc_event(device, event, 0);
2100                 keycode = KEY_BRIGHTNESSUP;
2101                 break;
2102         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2103                 if (brightness_switch_enabled)
2104                         acpi_video_switch_brightness(video_device, event);
2105                 acpi_bus_generate_proc_event(device, event, 0);
2106                 keycode = KEY_BRIGHTNESSDOWN;
2107                 break;
2108         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2109                 if (brightness_switch_enabled)
2110                         acpi_video_switch_brightness(video_device, event);
2111                 acpi_bus_generate_proc_event(device, event, 0);
2112                 keycode = KEY_BRIGHTNESS_ZERO;
2113                 break;
2114         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2115                 if (brightness_switch_enabled)
2116                         acpi_video_switch_brightness(video_device, event);
2117                 acpi_bus_generate_proc_event(device, event, 0);
2118                 keycode = KEY_DISPLAY_OFF;
2119                 break;
2120         default:
2121                 keycode = KEY_UNKNOWN;
2122                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2123                                   "Unsupported event [0x%x]\n", event));
2124                 break;
2125         }
2126
2127         acpi_notifier_call_chain(device, event, 0);
2128         input_report_key(input, keycode, 1);
2129         input_sync(input);
2130         input_report_key(input, keycode, 0);
2131         input_sync(input);
2132
2133         return;
2134 }
2135
2136 static int instance;
2137 static int acpi_video_resume(struct acpi_device *device)
2138 {
2139         struct acpi_video_bus *video;
2140         struct acpi_video_device *video_device;
2141         int i;
2142
2143         if (!device || !acpi_driver_data(device))
2144                 return -EINVAL;
2145
2146         video = acpi_driver_data(device);
2147
2148         for (i = 0; i < video->attached_count; i++) {
2149                 video_device = video->attached_array[i].bind_info;
2150                 if (video_device && video_device->backlight)
2151                         acpi_video_set_brightness(video_device->backlight);
2152         }
2153         return AE_OK;
2154 }
2155
2156 static int acpi_video_bus_add(struct acpi_device *device)
2157 {
2158         struct acpi_video_bus *video;
2159         struct input_dev *input;
2160         int error;
2161
2162         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2163         if (!video)
2164                 return -ENOMEM;
2165
2166         /* a hack to fix the duplicate name "VID" problem on T61 */
2167         if (!strcmp(device->pnp.bus_id, "VID")) {
2168                 if (instance)
2169                         device->pnp.bus_id[3] = '0' + instance;
2170                 instance ++;
2171         }
2172         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2173         if (!strcmp(device->pnp.bus_id, "VGA")) {
2174                 if (instance)
2175                         device->pnp.bus_id[3] = '0' + instance;
2176                 instance++;
2177         }
2178
2179         video->device = device;
2180         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2181         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2182         device->driver_data = video;
2183
2184         acpi_video_bus_find_cap(video);
2185         error = acpi_video_bus_check(video);
2186         if (error)
2187                 goto err_free_video;
2188
2189         error = acpi_video_bus_add_fs(device);
2190         if (error)
2191                 goto err_free_video;
2192
2193         mutex_init(&video->device_list_lock);
2194         INIT_LIST_HEAD(&video->video_device_list);
2195
2196         acpi_video_bus_get_devices(video, device);
2197         acpi_video_bus_start_devices(video);
2198
2199         video->input = input = input_allocate_device();
2200         if (!input) {
2201                 error = -ENOMEM;
2202                 goto err_stop_video;
2203         }
2204
2205         snprintf(video->phys, sizeof(video->phys),
2206                 "%s/video/input0", acpi_device_hid(video->device));
2207
2208         input->name = acpi_device_name(video->device);
2209         input->phys = video->phys;
2210         input->id.bustype = BUS_HOST;
2211         input->id.product = 0x06;
2212         input->dev.parent = &device->dev;
2213         input->evbit[0] = BIT(EV_KEY);
2214         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2215         set_bit(KEY_VIDEO_NEXT, input->keybit);
2216         set_bit(KEY_VIDEO_PREV, input->keybit);
2217         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2218         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2219         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2220         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2221         set_bit(KEY_DISPLAY_OFF, input->keybit);
2222         set_bit(KEY_UNKNOWN, input->keybit);
2223
2224         error = input_register_device(input);
2225         if (error)
2226                 goto err_free_input_dev;
2227
2228         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2229                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2230                video->flags.multihead ? "yes" : "no",
2231                video->flags.rom ? "yes" : "no",
2232                video->flags.post ? "yes" : "no");
2233
2234         return 0;
2235
2236  err_free_input_dev:
2237         input_free_device(input);
2238  err_stop_video:
2239         acpi_video_bus_stop_devices(video);
2240         acpi_video_bus_put_devices(video);
2241         kfree(video->attached_array);
2242         acpi_video_bus_remove_fs(device);
2243  err_free_video:
2244         kfree(video);
2245         device->driver_data = NULL;
2246
2247         return error;
2248 }
2249
2250 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2251 {
2252         struct acpi_video_bus *video = NULL;
2253
2254
2255         if (!device || !acpi_driver_data(device))
2256                 return -EINVAL;
2257
2258         video = acpi_driver_data(device);
2259
2260         acpi_video_bus_stop_devices(video);
2261         acpi_video_bus_put_devices(video);
2262         acpi_video_bus_remove_fs(device);
2263
2264         input_unregister_device(video->input);
2265         kfree(video->attached_array);
2266         kfree(video);
2267
2268         return 0;
2269 }
2270
2271 static int __init intel_opregion_present(void)
2272 {
2273 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2274         struct pci_dev *dev = NULL;
2275         u32 address;
2276
2277         for_each_pci_dev(dev) {
2278                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2279                         continue;
2280                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2281                         continue;
2282                 pci_read_config_dword(dev, 0xfc, &address);
2283                 if (!address)
2284                         continue;
2285                 return 1;
2286         }
2287 #endif
2288         return 0;
2289 }
2290
2291 int acpi_video_register(void)
2292 {
2293         int result = 0;
2294
2295         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2296         if (!acpi_video_dir)
2297                 return -ENODEV;
2298
2299         result = acpi_bus_register_driver(&acpi_video_bus);
2300         if (result < 0) {
2301                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2302                 return -ENODEV;
2303         }
2304
2305         return 0;
2306 }
2307 EXPORT_SYMBOL(acpi_video_register);
2308
2309 /*
2310  * This is kind of nasty. Hardware using Intel chipsets may require
2311  * the video opregion code to be run first in order to initialise
2312  * state before any ACPI video calls are made. To handle this we defer
2313  * registration of the video class until the opregion code has run.
2314  */
2315
2316 static int __init acpi_video_init(void)
2317 {
2318         dmi_check_system(video_dmi_table);
2319
2320         if (intel_opregion_present())
2321                 return 0;
2322
2323         return acpi_video_register();
2324 }
2325
2326 static void __exit acpi_video_exit(void)
2327 {
2328
2329         acpi_bus_unregister_driver(&acpi_video_bus);
2330
2331         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2332
2333         return;
2334 }
2335
2336 module_init(acpi_video_init);
2337 module_exit(acpi_video_exit);