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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43 #include <linux/dmi.h>
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_CLASS                "video"
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define ACPI_VIDEO_DISPLAY_CRT  1
  67 #define ACPI_VIDEO_DISPLAY_TV   2
  68 #define ACPI_VIDEO_DISPLAY_DVI  3
  69 #define ACPI_VIDEO_DISPLAY_LCD  4
  70
  71 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  72 ACPI_MODULE_NAME("video");
  73
  74 MODULE_AUTHOR("Bruno Ducrot");
  75 MODULE_DESCRIPTION("ACPI Video Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int brightness_switch_enabled = 1;
  79 module_param(brightness_switch_enabled, bool, 0644);
  80
  81 /*
  82  * By default, we don't allow duplicate ACPI video bus devices
  83  * under the same VGA controller
  84  */
  85 static int allow_duplicates;
  86 module_param(allow_duplicates, bool, 0644);
  87
  88 static int register_count = 0;
  89 static int acpi_video_bus_add(struct acpi_device *device);
  90 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  91 static int acpi_video_resume(struct acpi_device *device);
  92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  93
  94 static const struct acpi_device_id video_device_ids[] = {
  95         {ACPI_VIDEO_HID, 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  99
 100 static struct acpi_driver acpi_video_bus = {
 101         .name = "video",
 102         .class = ACPI_VIDEO_CLASS,
 103         .ids = video_device_ids,
 104         .ops = {
 105                 .add = acpi_video_bus_add,
 106                 .remove = acpi_video_bus_remove,
 107                 .resume = acpi_video_resume,
 108                 .notify = acpi_video_bus_notify,
 109                 },
 110 };
 111
 112 struct acpi_video_bus_flags {
 113         u8 multihead:1;         /* can switch video heads */
 114         u8 rom:1;               /* can retrieve a video rom */
 115         u8 post:1;              /* can configure the head to */
 116         u8 reserved:5;
 117 };
 118
 119 struct acpi_video_bus_cap {
 120         u8 _DOS:1;              /*Enable/Disable output switching */
 121         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 122         u8 _ROM:1;              /*Get ROM Data */
 123         u8 _GPD:1;              /*Get POST Device */
 124         u8 _SPD:1;              /*Set POST Device */
 125         u8 _VPO:1;              /*Video POST Options */
 126         u8 reserved:2;
 127 };
 128
 129 struct acpi_video_device_attrib {
 130         u32 display_index:4;    /* A zero-based instance of the Display */
 131         u32 display_port_attachment:4;  /*This field differentiates the display type */
 132         u32 display_type:4;     /*Describe the specific type in use */
 133         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 134         u32 bios_can_detect:1;  /*BIOS can detect the device */
 135         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 136                                    the VGA device. */
 137         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 138         u32 reserved:10;        /*Must be 0 */
 139         u32 device_id_scheme:1; /*Device ID Scheme */
 140 };
 141
 142 struct acpi_video_enumerated_device {
 143         union {
 144                 u32 int_val;
 145                 struct acpi_video_device_attrib attrib;
 146         } value;
 147         struct acpi_video_device *bind_info;
 148 };
 149
 150 struct acpi_video_bus {
 151         struct acpi_device *device;
 152         u8 dos_setting;
 153         struct acpi_video_enumerated_device *attached_array;
 154         u8 attached_count;
 155         struct acpi_video_bus_cap cap;
 156         struct acpi_video_bus_flags flags;
 157         struct list_head video_device_list;
 158         struct mutex device_list_lock;  /* protects video_device_list */
 159         struct proc_dir_entry *dir;
 160         struct input_dev *input;
 161         char phys[32];  /* for input device */
 162 };
 163
 164 struct acpi_video_device_flags {
 165         u8 crt:1;
 166         u8 lcd:1;
 167         u8 tvout:1;
 168         u8 dvi:1;
 169         u8 bios:1;
 170         u8 unknown:1;
 171         u8 reserved:2;
 172 };
 173
 174 struct acpi_video_device_cap {
 175         u8 _ADR:1;              /*Return the unique ID */
 176         u8 _BCL:1;              /*Query list of brightness control levels supported */
 177         u8 _BCM:1;              /*Set the brightness level */
 178         u8 _BQC:1;              /* Get current brightness level */
 179         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 180         u8 _DDC:1;              /*Return the EDID for this device */
 181         u8 _DCS:1;              /*Return status of output device */
 182         u8 _DGS:1;              /*Query graphics state */
 183         u8 _DSS:1;              /*Device state set */
 184 };
 185
 186 struct acpi_video_brightness_flags {
 187         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 188         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 189         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 190         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 191         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 192 };
 193
 194 struct acpi_video_device_brightness {
 195         int curr;
 196         int count;
 197         int *levels;
 198         struct acpi_video_brightness_flags flags;
 199 };
 200
 201 struct acpi_video_device {
 202         unsigned long device_id;
 203         struct acpi_video_device_flags flags;
 204         struct acpi_video_device_cap cap;
 205         struct list_head entry;
 206         struct acpi_video_bus *video;
 207         struct acpi_device *dev;
 208         struct acpi_video_device_brightness *brightness;
 209         struct backlight_device *backlight;
 210         struct thermal_cooling_device *cooling_dev;
 211         struct output_device *output_dev;
 212 };
 213
 214 /* bus */
 215 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 216 static const struct file_operations acpi_video_bus_info_fops = {
 217         .owner = THIS_MODULE,
 218         .open = acpi_video_bus_info_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 225 static const struct file_operations acpi_video_bus_ROM_fops = {
 226         .owner = THIS_MODULE,
 227         .open = acpi_video_bus_ROM_open_fs,
 228         .read = seq_read,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 234                                             struct file *file);
 235 static const struct file_operations acpi_video_bus_POST_info_fops = {
 236         .owner = THIS_MODULE,
 237         .open = acpi_video_bus_POST_info_open_fs,
 238         .read = seq_read,
 239         .llseek = seq_lseek,
 240         .release = single_release,
 241 };
 242
 243 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 244 static ssize_t acpi_video_bus_write_POST(struct file *file,
 245         const char __user *buffer, size_t count, loff_t *data);
 246 static const struct file_operations acpi_video_bus_POST_fops = {
 247         .owner = THIS_MODULE,
 248         .open = acpi_video_bus_POST_open_fs,
 249         .read = seq_read,
 250         .write = acpi_video_bus_write_POST,
 251         .llseek = seq_lseek,
 252         .release = single_release,
 253 };
 254
 255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 256 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 257         const char __user *buffer, size_t count, loff_t *data);
 258 static const struct file_operations acpi_video_bus_DOS_fops = {
 259         .owner = THIS_MODULE,
 260         .open = acpi_video_bus_DOS_open_fs,
 261         .read = seq_read,
 262         .write = acpi_video_bus_write_DOS,
 263         .llseek = seq_lseek,
 264         .release = single_release,
 265 };
 266
 267 /* device */
 268 static int acpi_video_device_info_open_fs(struct inode *inode,
 269                                           struct file *file);
 270 static const struct file_operations acpi_video_device_info_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_info_open_fs,
 273         .read = seq_read,
 274         .llseek = seq_lseek,
 275         .release = single_release,
 276 };
 277
 278 static int acpi_video_device_state_open_fs(struct inode *inode,
 279                                            struct file *file);
 280 static ssize_t acpi_video_device_write_state(struct file *file,
 281         const char __user *buffer, size_t count, loff_t *data);
 282 static const struct file_operations acpi_video_device_state_fops = {
 283         .owner = THIS_MODULE,
 284         .open = acpi_video_device_state_open_fs,
 285         .read = seq_read,
 286         .write = acpi_video_device_write_state,
 287         .llseek = seq_lseek,
 288         .release = single_release,
 289 };
 290
 291 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 292                                                 struct file *file);
 293 static ssize_t acpi_video_device_write_brightness(struct file *file,
 294         const char __user *buffer, size_t count, loff_t *data);
 295 static const struct file_operations acpi_video_device_brightness_fops = {
 296         .owner = THIS_MODULE,
 297         .open = acpi_video_device_brightness_open_fs,
 298         .read = seq_read,
 299         .write = acpi_video_device_write_brightness,
 300         .llseek = seq_lseek,
 301         .release = single_release,
 302 };
 303
 304 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 305                                           struct file *file);
 306 static const struct file_operations acpi_video_device_EDID_fops = {
 307         .owner = THIS_MODULE,
 308         .open = acpi_video_device_EDID_open_fs,
 309         .read = seq_read,
 310         .llseek = seq_lseek,
 311         .release = single_release,
 312 };
 313
 314 static const char device_decode[][30] = {
 315         "motherboard VGA device",
 316         "PCI VGA device",
 317         "AGP VGA device",
 318         "UNKNOWN",
 319 };
 320
 321 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 322 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 323 static void acpi_video_device_bind(struct acpi_video_bus *video,
 324                                    struct acpi_video_device *device);
 325 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 326 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 327                         int level);
 328 static int acpi_video_device_lcd_get_level_current(
 329                         struct acpi_video_device *device,
 330                         unsigned long long *level, int init);
 331 static int acpi_video_get_next_level(struct acpi_video_device *device,
 332                                      u32 level_current, u32 event);
 333 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 334                                          int event);
 335 static int acpi_video_device_get_state(struct acpi_video_device *device,
 336                             unsigned long long *state);
 337 static int acpi_video_output_get(struct output_device *od);
 338 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 339
 340 /*backlight device sysfs support*/
 341 static int acpi_video_get_brightness(struct backlight_device *bd)
 342 {
 343         unsigned long long cur_level;
 344         int i;
 345         struct acpi_video_device *vd =
 346                 (struct acpi_video_device *)bl_get_data(bd);
 347
 348         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 349                 return -EINVAL;
 350         for (i = 2; i < vd->brightness->count; i++) {
 351                 if (vd->brightness->levels[i] == cur_level)
 352                         /* The first two entries are special - see page 575
 353                            of the ACPI spec 3.0 */
 354                         return i-2;
 355         }
 356         return 0;
 357 }
 358
 359 static int acpi_video_set_brightness(struct backlight_device *bd)
 360 {
 361         int request_level = bd->props.brightness + 2;
 362         struct acpi_video_device *vd =
 363                 (struct acpi_video_device *)bl_get_data(bd);
 364
 365         return acpi_video_device_lcd_set_level(vd,
 366                                 vd->brightness->levels[request_level]);
 367 }
 368
 369 static struct backlight_ops acpi_backlight_ops = {
 370         .get_brightness = acpi_video_get_brightness,
 371         .update_status  = acpi_video_set_brightness,
 372 };
 373
 374 /*video output device sysfs support*/
 375 static int acpi_video_output_get(struct output_device *od)
 376 {
 377         unsigned long long state;
 378         struct acpi_video_device *vd =
 379                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 380         acpi_video_device_get_state(vd, &state);
 381         return (int)state;
 382 }
 383
 384 static int acpi_video_output_set(struct output_device *od)
 385 {
 386         unsigned long state = od->request_state;
 387         struct acpi_video_device *vd=
 388                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 389         return acpi_video_device_set_state(vd, state);
 390 }
 391
 392 static struct output_properties acpi_output_properties = {
 393         .set_state = acpi_video_output_set,
 394         .get_status = acpi_video_output_get,
 395 };
 396
 397
 398 /* thermal cooling device callbacks */
 399 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 400                                long *state)
 401 {
 402         struct acpi_device *device = cooling_dev->devdata;
 403         struct acpi_video_device *video = acpi_driver_data(device);
 404
 405         *state = video->brightness->count - 3;
 406         return 0;
 407 }
 408
 409 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 410                                long *state)
 411 {
 412         struct acpi_device *device = cooling_dev->devdata;
 413         struct acpi_video_device *video = acpi_driver_data(device);
 414         unsigned long long level;
 415         int offset;
 416
 417         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 418                 return -EINVAL;
 419         for (offset = 2; offset < video->brightness->count; offset++)
 420                 if (level == video->brightness->levels[offset]) {
 421                         *state = video->brightness->count - offset - 1;
 422                         return 0;
 423                 }
 424
 425         return -EINVAL;
 426 }
 427
 428 static int
 429 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 430 {
 431         struct acpi_device *device = cooling_dev->devdata;
 432         struct acpi_video_device *video = acpi_driver_data(device);
 433         int level;
 434
 435         if ( state >= video->brightness->count - 2)
 436                 return -EINVAL;
 437
 438         state = video->brightness->count - state;
 439         level = video->brightness->levels[state -1];
 440         return acpi_video_device_lcd_set_level(video, level);
 441 }
 442
 443 static struct thermal_cooling_device_ops video_cooling_ops = {
 444         .get_max_state = video_get_max_state,
 445         .get_cur_state = video_get_cur_state,
 446         .set_cur_state = video_set_cur_state,
 447 };
 448
 449 /* --------------------------------------------------------------------------
 450                                Video Management
 451    -------------------------------------------------------------------------- */
 452
 453 /* device */
 454
 455 static int
 456 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 457 {
 458         int status;
 459
 460         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 461
 462         return status;
 463 }
 464
 465 static int
 466 acpi_video_device_get_state(struct acpi_video_device *device,
 467                             unsigned long long *state)
 468 {
 469         int status;
 470
 471         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 472
 473         return status;
 474 }
 475
 476 static int
 477 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 478 {
 479         int status;
 480         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 481         struct acpi_object_list args = { 1, &arg0 };
 482         unsigned long long ret;
 483
 484
 485         arg0.integer.value = state;
 486         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 487
 488         return status;
 489 }
 490
 491 static int
 492 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 493                                    union acpi_object **levels)
 494 {
 495         int status;
 496         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 497         union acpi_object *obj;
 498
 499
 500         *levels = NULL;
 501
 502         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 503         if (!ACPI_SUCCESS(status))
 504                 return status;
 505         obj = (union acpi_object *)buffer.pointer;
 506         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 507                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 508                 status = -EFAULT;
 509                 goto err;
 510         }
 511
 512         *levels = obj;
 513
 514         return 0;
 515
 516       err:
 517         kfree(buffer.pointer);
 518
 519         return status;
 520 }
 521
 522 static int
 523 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 524 {
 525         int status;
 526         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 527         struct acpi_object_list args = { 1, &arg0 };
 528         int state;
 529
 530         arg0.integer.value = level;
 531
 532         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 533                                       &args, NULL);
 534         if (ACPI_FAILURE(status)) {
 535                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 536                 return -EIO;
 537         }
 538
 539         device->brightness->curr = level;
 540         for (state = 2; state < device->brightness->count; state++)
 541                 if (level == device->brightness->levels[state]) {
 542                         if (device->backlight)
 543                                 device->backlight->props.brightness = state - 2;
 544                         return 0;
 545                 }
 546
 547         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 548         return -EINVAL;
 549 }
 550
 551 /*
 552  * For some buggy _BQC methods, we need to add a constant value to
 553  * the _BQC return value to get the actual current brightness level
 554  */
 555
 556 static int bqc_offset_aml_bug_workaround;
 557 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 558 {
 559         bqc_offset_aml_bug_workaround = 9;
 560         return 0;
 561 }
 562
 563 static struct dmi_system_id video_dmi_table[] __initdata = {
 564         /*
 565          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 566          */
 567         {
 568          .callback = video_set_bqc_offset,
 569          .ident = "Acer Aspire 5720",
 570          .matches = {
 571                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 572                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 573                 },
 574         },
 575         {
 576          .callback = video_set_bqc_offset,
 577          .ident = "Acer Aspire 5710Z",
 578          .matches = {
 579                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 580                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 581                 },
 582         },
 583         {
 584          .callback = video_set_bqc_offset,
 585          .ident = "eMachines E510",
 586          .matches = {
 587                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 588                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 589                 },
 590         },
 591         {
 592          .callback = video_set_bqc_offset,
 593          .ident = "Acer Aspire 5315",
 594          .matches = {
 595                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 596                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 597                 },
 598         },
 599         {
 600          .callback = video_set_bqc_offset,
 601          .ident = "Acer Aspire 7720",
 602          .matches = {
 603                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 604                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 605                 },
 606         },
 607         {}
 608 };
 609
 610 static int
 611 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 612                                         unsigned long long *level, int init)
 613 {
 614         acpi_status status = AE_OK;
 615         int i;
 616
 617         if (device->cap._BQC || device->cap._BCQ) {
 618                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 619
 620                 status = acpi_evaluate_integer(device->dev->handle, buf,
 621                                                 NULL, level);
 622                 if (ACPI_SUCCESS(status)) {
 623                         if (device->brightness->flags._BQC_use_index) {
 624                                 if (device->brightness->flags._BCL_reversed)
 625                                         *level = device->brightness->count
 626                                                                  - 3 - (*level);
 627                                 *level = device->brightness->levels[*level + 2];
 628
 629                         }
 630                         *level += bqc_offset_aml_bug_workaround;
 631                         for (i = 2; i < device->brightness->count; i++)
 632                                 if (device->brightness->levels[i] == *level) {
 633                                         device->brightness->curr = *level;
 634                                         return 0;
 635                         }
 636                         if (!init) {
 637                                 /*
 638                                  * BQC returned an invalid level.
 639                                  * Stop using it.
 640                                  */
 641                                 ACPI_WARNING((AE_INFO,
 642                                               "%s returned an invalid level",
 643                                               buf));
 644                                 device->cap._BQC = device->cap._BCQ = 0;
 645                         }
 646                 } else {
 647                         /* Fixme:
 648                          * should we return an error or ignore this failure?
 649                          * dev->brightness->curr is a cached value which stores
 650                          * the correct current backlight level in most cases.
 651                          * ACPI video backlight still works w/ buggy _BQC.
 652                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 653                          */
 654                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 655                         device->cap._BQC = device->cap._BCQ = 0;
 656                 }
 657         }
 658
 659         *level = device->brightness->curr;
 660         return 0;
 661 }
 662
 663 static int
 664 acpi_video_device_EDID(struct acpi_video_device *device,
 665                        union acpi_object **edid, ssize_t length)
 666 {
 667         int status;
 668         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 669         union acpi_object *obj;
 670         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 671         struct acpi_object_list args = { 1, &arg0 };
 672
 673
 674         *edid = NULL;
 675
 676         if (!device)
 677                 return -ENODEV;
 678         if (length == 128)
 679                 arg0.integer.value = 1;
 680         else if (length == 256)
 681                 arg0.integer.value = 2;
 682         else
 683                 return -EINVAL;
 684
 685         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 686         if (ACPI_FAILURE(status))
 687                 return -ENODEV;
 688
 689         obj = buffer.pointer;
 690
 691         if (obj && obj->type == ACPI_TYPE_BUFFER)
 692                 *edid = obj;
 693         else {
 694                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 695                 status = -EFAULT;
 696                 kfree(obj);
 697         }
 698
 699         return status;
 700 }
 701
 702 /* bus */
 703
 704 static int
 705 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 706 {
 707         int status;
 708         unsigned long long tmp;
 709         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 710         struct acpi_object_list args = { 1, &arg0 };
 711
 712
 713         arg0.integer.value = option;
 714
 715         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 716         if (ACPI_SUCCESS(status))
 717                 status = tmp ? (-EINVAL) : (AE_OK);
 718
 719         return status;
 720 }
 721
 722 static int
 723 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 724 {
 725         int status;
 726
 727         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 728
 729         return status;
 730 }
 731
 732 static int
 733 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 734                             unsigned long long *options)
 735 {
 736         int status;
 737
 738         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 739         *options &= 3;
 740
 741         return status;
 742 }
 743
 744 /*
 745  *  Arg:
 746  *      video           : video bus device pointer
 747  *      bios_flag       :
 748  *              0.      The system BIOS should NOT automatically switch(toggle)
 749  *                      the active display output.
 750  *              1.      The system BIOS should automatically switch (toggle) the
 751  *                      active display output. No switch event.
 752  *              2.      The _DGS value should be locked.
 753  *              3.      The system BIOS should not automatically switch (toggle) the
 754  *                      active display output, but instead generate the display switch
 755  *                      event notify code.
 756  *      lcd_flag        :
 757  *              0.      The system BIOS should automatically control the brightness level
 758  *                      of the LCD when the power changes from AC to DC
 759  *              1.      The system BIOS should NOT automatically control the brightness
 760  *                      level of the LCD when the power changes from AC to DC.
 761  * Return Value:
 762  *              -1      wrong arg.
 763  */
 764
 765 static int
 766 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 767 {
 768         u64 status = 0;
 769         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 770         struct acpi_object_list args = { 1, &arg0 };
 771
 772
 773         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 774                 status = -1;
 775                 goto Failed;
 776         }
 777         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 778         video->dos_setting = arg0.integer.value;
 779         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 780
 781       Failed:
 782         return status;
 783 }
 784
 785 /*
 786  * Simple comparison function used to sort backlight levels.
 787  */
 788
 789 static int
 790 acpi_video_cmp_level(const void *a, const void *b)
 791 {
 792         return *(int *)a - *(int *)b;
 793 }
 794
 795 /*
 796  *  Arg:
 797  *      device  : video output device (LCD, CRT, ..)
 798  *
 799  *  Return Value:
 800  *      Maximum brightness level
 801  *
 802  *  Allocate and initialize device->brightness.
 803  */
 804
 805 static int
 806 acpi_video_init_brightness(struct acpi_video_device *device)
 807 {
 808         union acpi_object *obj = NULL;
 809         int i, max_level = 0, count = 0, level_ac_battery = 0;
 810         unsigned long long level, level_old;
 811         union acpi_object *o;
 812         struct acpi_video_device_brightness *br = NULL;
 813         int result = -EINVAL;
 814
 815         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 816                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 817                                                 "LCD brightness level\n"));
 818                 goto out;
 819         }
 820
 821         if (obj->package.count < 2)
 822                 goto out;
 823
 824         br = kzalloc(sizeof(*br), GFP_KERNEL);
 825         if (!br) {
 826                 printk(KERN_ERR "can't allocate memory\n");
 827                 result = -ENOMEM;
 828                 goto out;
 829         }
 830
 831         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 832                                 GFP_KERNEL);
 833         if (!br->levels) {
 834                 result = -ENOMEM;
 835                 goto out_free;
 836         }
 837
 838         for (i = 0; i < obj->package.count; i++) {
 839                 o = (union acpi_object *)&obj->package.elements[i];
 840                 if (o->type != ACPI_TYPE_INTEGER) {
 841                         printk(KERN_ERR PREFIX "Invalid data\n");
 842                         continue;
 843                 }
 844                 br->levels[count] = (u32) o->integer.value;
 845
 846                 if (br->levels[count] > max_level)
 847                         max_level = br->levels[count];
 848                 count++;
 849         }
 850
 851         /*
 852          * some buggy BIOS don't export the levels
 853          * when machine is on AC/Battery in _BCL package.
 854          * In this case, the first two elements in _BCL packages
 855          * are also supported brightness levels that OS should take care of.
 856          */
 857         for (i = 2; i < count; i++) {
 858                 if (br->levels[i] == br->levels[0])
 859                         level_ac_battery++;
 860                 if (br->levels[i] == br->levels[1])
 861                         level_ac_battery++;
 862         }
 863
 864         if (level_ac_battery < 2) {
 865                 level_ac_battery = 2 - level_ac_battery;
 866                 br->flags._BCL_no_ac_battery_levels = 1;
 867                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 868                         br->levels[i] = br->levels[i - level_ac_battery];
 869                 count += level_ac_battery;
 870         } else if (level_ac_battery > 2)
 871                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 872
 873         /* Check if the _BCL package is in a reversed order */
 874         if (max_level == br->levels[2]) {
 875                 br->flags._BCL_reversed = 1;
 876                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 877                         acpi_video_cmp_level, NULL);
 878         } else if (max_level != br->levels[count - 1])
 879                 ACPI_ERROR((AE_INFO,
 880                             "Found unordered _BCL package\n"));
 881
 882         br->count = count;
 883         device->brightness = br;
 884
 885         /* Check the input/output of _BQC/_BCL/_BCM */
 886         if ((max_level < 100) && (max_level <= (count - 2)))
 887                 br->flags._BCL_use_index = 1;
 888
 889         /*
 890          * _BCM is always consistent with _BCL,
 891          * at least for all the laptops we have ever seen.
 892          */
 893         br->flags._BCM_use_index = br->flags._BCL_use_index;
 894
 895         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 896         br->curr = level = max_level;
 897
 898         if (!device->cap._BQC)
 899                 goto set_level;
 900
 901         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 902         if (result)
 903                 goto out_free_levels;
 904
 905         /*
 906          * Set the level to maximum and check if _BQC uses indexed value
 907          */
 908         result = acpi_video_device_lcd_set_level(device, max_level);
 909         if (result)
 910                 goto out_free_levels;
 911
 912         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 913         if (result)
 914                 goto out_free_levels;
 915
 916         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 917
 918         if (!br->flags._BQC_use_index) {
 919                 /*
 920                  * Set the backlight to the initial state.
 921                  * On some buggy laptops, _BQC returns an uninitialized value
 922                  * when invoked for the first time, i.e. level_old is invalid.
 923                  * set the backlight to max_level in this case
 924                  */
 925                 for (i = 2; i < br->count; i++)
 926                         if (level_old == br->levels[i])
 927                                 level = level_old;
 928                 goto set_level;
 929         }
 930
 931         if (br->flags._BCL_reversed)
 932                 level_old = (br->count - 1) - level_old;
 933         level = br->levels[level_old];
 934
 935 set_level:
 936         result = acpi_video_device_lcd_set_level(device, level);
 937         if (result)
 938                 goto out_free_levels;
 939
 940         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 941                           "found %d brightness levels\n", count - 2));
 942         kfree(obj);
 943         return result;
 944
 945 out_free_levels:
 946         kfree(br->levels);
 947 out_free:
 948         kfree(br);
 949 out:
 950         device->brightness = NULL;
 951         kfree(obj);
 952         return result;
 953 }
 954
 955 /*
 956  *  Arg:
 957  *      device  : video output device (LCD, CRT, ..)
 958  *
 959  *  Return Value:
 960  *      None
 961  *
 962  *  Find out all required AML methods defined under the output
 963  *  device.
 964  */
 965
 966 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 967 {
 968         acpi_handle h_dummy1;
 969
 970         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 971                 device->cap._ADR = 1;
 972         }
 973         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 974                 device->cap._BCL = 1;
 975         }
 976         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 977                 device->cap._BCM = 1;
 978         }
 979         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 980                 device->cap._BQC = 1;
 981         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 982                                 &h_dummy1))) {
 983                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 984                 device->cap._BCQ = 1;
 985         }
 986
 987         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 988                 device->cap._DDC = 1;
 989         }
 990         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 991                 device->cap._DCS = 1;
 992         }
 993         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 994                 device->cap._DGS = 1;
 995         }
 996         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 997                 device->cap._DSS = 1;
 998         }
 999
1000         if (acpi_video_backlight_support()) {
1001                 int result;
1002                 static int count = 0;
1003                 char *name;
1004
1005                 result = acpi_video_init_brightness(device);
1006                 if (result)
1007                         return;
1008                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1009                 if (!name)
1010                         return;
1011
1012                 sprintf(name, "acpi_video%d", count++);
1013                 device->backlight = backlight_device_register(name,
1014                         NULL, device, &acpi_backlight_ops);
1015                 kfree(name);
1016                 if (IS_ERR(device->backlight))
1017                         return;
1018                 device->backlight->props.max_brightness = device->brightness->count-3;
1019
1020                 result = sysfs_create_link(&device->backlight->dev.kobj,
1021                                            &device->dev->dev.kobj, "device");
1022                 if (result)
1023                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1024
1025                 device->cooling_dev = thermal_cooling_device_register("LCD",
1026                                         device->dev, &video_cooling_ops);
1027                 if (IS_ERR(device->cooling_dev)) {
1028                         /*
1029                          * Set cooling_dev to NULL so we don't crash trying to
1030                          * free it.
1031                          * Also, why the hell we are returning early and
1032                          * not attempt to register video output if cooling
1033                          * device registration failed?
1034                          * -- dtor
1035                          */
1036                         device->cooling_dev = NULL;
1037                         return;
1038                 }
1039
1040                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1041                          device->cooling_dev->id);
1042                 result = sysfs_create_link(&device->dev->dev.kobj,
1043                                 &device->cooling_dev->device.kobj,
1044                                 "thermal_cooling");
1045                 if (result)
1046                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1047                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1048                                 &device->dev->dev.kobj, "device");
1049                 if (result)
1050                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1051
1052         }
1053
1054         if (acpi_video_display_switch_support()) {
1055
1056                 if (device->cap._DCS && device->cap._DSS) {
1057                         static int count;
1058                         char *name;
1059                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1060                         if (!name)
1061                                 return;
1062                         sprintf(name, "acpi_video%d", count++);
1063                         device->output_dev = video_output_register(name,
1064                                         NULL, device, &acpi_output_properties);
1065                         kfree(name);
1066                 }
1067         }
1068 }
1069
1070 /*
1071  *  Arg:
1072  *      device  : video output device (VGA)
1073  *
1074  *  Return Value:
1075  *      None
1076  *
1077  *  Find out all required AML methods defined under the video bus device.
1078  */
1079
1080 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1081 {
1082         acpi_handle h_dummy1;
1083
1084         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1085                 video->cap._DOS = 1;
1086         }
1087         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1088                 video->cap._DOD = 1;
1089         }
1090         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1091                 video->cap._ROM = 1;
1092         }
1093         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1094                 video->cap._GPD = 1;
1095         }
1096         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1097                 video->cap._SPD = 1;
1098         }
1099         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1100                 video->cap._VPO = 1;
1101         }
1102 }
1103
1104 /*
1105  * Check whether the video bus device has required AML method to
1106  * support the desired features
1107  */
1108
1109 static int acpi_video_bus_check(struct acpi_video_bus *video)
1110 {
1111         acpi_status status = -ENOENT;
1112         struct pci_dev *dev;
1113
1114         if (!video)
1115                 return -EINVAL;
1116
1117         dev = acpi_get_pci_dev(video->device->handle);
1118         if (!dev)
1119                 return -ENODEV;
1120         pci_dev_put(dev);
1121
1122         /* Since there is no HID, CID and so on for VGA driver, we have
1123          * to check well known required nodes.
1124          */
1125
1126         /* Does this device support video switching? */
1127         if (video->cap._DOS || video->cap._DOD) {
1128                 if (!video->cap._DOS) {
1129                         printk(KERN_WARNING FW_BUG
1130                                 "ACPI(%s) defines _DOD but not _DOS\n",
1131                                 acpi_device_bid(video->device));
1132                 }
1133                 video->flags.multihead = 1;
1134                 status = 0;
1135         }
1136
1137         /* Does this device support retrieving a video ROM? */
1138         if (video->cap._ROM) {
1139                 video->flags.rom = 1;
1140                 status = 0;
1141         }
1142
1143         /* Does this device support configuring which video device to POST? */
1144         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1145                 video->flags.post = 1;
1146                 status = 0;
1147         }
1148
1149         return status;
1150 }
1151
1152 /* --------------------------------------------------------------------------
1153                               FS Interface (/proc)
1154    -------------------------------------------------------------------------- */
1155
1156 static struct proc_dir_entry *acpi_video_dir;
1157
1158 /* video devices */
1159
1160 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1161 {
1162         struct acpi_video_device *dev = seq->private;
1163
1164
1165         if (!dev)
1166                 goto end;
1167
1168         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1169         seq_printf(seq, "type:         ");
1170         if (dev->flags.crt)
1171                 seq_printf(seq, "CRT\n");
1172         else if (dev->flags.lcd)
1173                 seq_printf(seq, "LCD\n");
1174         else if (dev->flags.tvout)
1175                 seq_printf(seq, "TVOUT\n");
1176         else if (dev->flags.dvi)
1177                 seq_printf(seq, "DVI\n");
1178         else
1179                 seq_printf(seq, "UNKNOWN\n");
1180
1181         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1182
1183       end:
1184         return 0;
1185 }
1186
1187 static int
1188 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1189 {
1190         return single_open(file, acpi_video_device_info_seq_show,
1191                            PDE(inode)->data);
1192 }
1193
1194 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1195 {
1196         int status;
1197         struct acpi_video_device *dev = seq->private;
1198         unsigned long long state;
1199
1200
1201         if (!dev)
1202                 goto end;
1203
1204         status = acpi_video_device_get_state(dev, &state);
1205         seq_printf(seq, "state:     ");
1206         if (ACPI_SUCCESS(status))
1207                 seq_printf(seq, "0x%02llx\n", state);
1208         else
1209                 seq_printf(seq, "<not supported>\n");
1210
1211         status = acpi_video_device_query(dev, &state);
1212         seq_printf(seq, "query:     ");
1213         if (ACPI_SUCCESS(status))
1214                 seq_printf(seq, "0x%02llx\n", state);
1215         else
1216                 seq_printf(seq, "<not supported>\n");
1217
1218       end:
1219         return 0;
1220 }
1221
1222 static int
1223 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1224 {
1225         return single_open(file, acpi_video_device_state_seq_show,
1226                            PDE(inode)->data);
1227 }
1228
1229 static ssize_t
1230 acpi_video_device_write_state(struct file *file,
1231                               const char __user * buffer,
1232                               size_t count, loff_t * data)
1233 {
1234         int status;
1235         struct seq_file *m = file->private_data;
1236         struct acpi_video_device *dev = m->private;
1237         char str[12] = { 0 };
1238         u32 state = 0;
1239
1240
1241         if (!dev || count >= sizeof(str))
1242                 return -EINVAL;
1243
1244         if (copy_from_user(str, buffer, count))
1245                 return -EFAULT;
1246
1247         str[count] = 0;
1248         state = simple_strtoul(str, NULL, 0);
1249         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1250
1251         status = acpi_video_device_set_state(dev, state);
1252
1253         if (status)
1254                 return -EFAULT;
1255
1256         return count;
1257 }
1258
1259 static int
1260 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1261 {
1262         struct acpi_video_device *dev = seq->private;
1263         int i;
1264
1265
1266         if (!dev || !dev->brightness) {
1267                 seq_printf(seq, "<not supported>\n");
1268                 return 0;
1269         }
1270
1271         seq_printf(seq, "levels: ");
1272         for (i = 2; i < dev->brightness->count; i++)
1273                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1274         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1275
1276         return 0;
1277 }
1278
1279 static int
1280 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1281 {
1282         return single_open(file, acpi_video_device_brightness_seq_show,
1283                            PDE(inode)->data);
1284 }
1285
1286 static ssize_t
1287 acpi_video_device_write_brightness(struct file *file,
1288                                    const char __user * buffer,
1289                                    size_t count, loff_t * data)
1290 {
1291         struct seq_file *m = file->private_data;
1292         struct acpi_video_device *dev = m->private;
1293         char str[5] = { 0 };
1294         unsigned int level = 0;
1295         int i;
1296
1297
1298         if (!dev || !dev->brightness || count >= sizeof(str))
1299                 return -EINVAL;
1300
1301         if (copy_from_user(str, buffer, count))
1302                 return -EFAULT;
1303
1304         str[count] = 0;
1305         level = simple_strtoul(str, NULL, 0);
1306
1307         if (level > 100)
1308                 return -EFAULT;
1309
1310         /* validate through the list of available levels */
1311         for (i = 2; i < dev->brightness->count; i++)
1312                 if (level == dev->brightness->levels[i]) {
1313                         if (!acpi_video_device_lcd_set_level(dev, level))
1314                                 return count;
1315                         break;
1316                 }
1317
1318         return -EINVAL;
1319 }
1320
1321 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1322 {
1323         struct acpi_video_device *dev = seq->private;
1324         int status;
1325         int i;
1326         union acpi_object *edid = NULL;
1327
1328
1329         if (!dev)
1330                 goto out;
1331
1332         status = acpi_video_device_EDID(dev, &edid, 128);
1333         if (ACPI_FAILURE(status)) {
1334                 status = acpi_video_device_EDID(dev, &edid, 256);
1335         }
1336
1337         if (ACPI_FAILURE(status)) {
1338                 goto out;
1339         }
1340
1341         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1342                 for (i = 0; i < edid->buffer.length; i++)
1343                         seq_putc(seq, edid->buffer.pointer[i]);
1344         }
1345
1346       out:
1347         if (!edid)
1348                 seq_printf(seq, "<not supported>\n");
1349         else
1350                 kfree(edid);
1351
1352         return 0;
1353 }
1354
1355 static int
1356 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1357 {
1358         return single_open(file, acpi_video_device_EDID_seq_show,
1359                            PDE(inode)->data);
1360 }
1361
1362 static int acpi_video_device_add_fs(struct acpi_device *device)
1363 {
1364         struct proc_dir_entry *entry, *device_dir;
1365         struct acpi_video_device *vid_dev;
1366
1367         vid_dev = acpi_driver_data(device);
1368         if (!vid_dev)
1369                 return -ENODEV;
1370
1371         device_dir = proc_mkdir(acpi_device_bid(device),
1372                                 vid_dev->video->dir);
1373         if (!device_dir)
1374                 return -ENOMEM;
1375
1376         /* 'info' [R] */
1377         entry = proc_create_data("info", S_IRUGO, device_dir,
1378                         &acpi_video_device_info_fops, acpi_driver_data(device));
1379         if (!entry)
1380                 goto err_remove_dir;
1381
1382         /* 'state' [R/W] */
1383         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1384                                  device_dir,
1385                                  &acpi_video_device_state_fops,
1386                                  acpi_driver_data(device));
1387         if (!entry)
1388                 goto err_remove_info;
1389
1390         /* 'brightness' [R/W] */
1391         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1392                                  device_dir,
1393                                  &acpi_video_device_brightness_fops,
1394                                  acpi_driver_data(device));
1395         if (!entry)
1396                 goto err_remove_state;
1397
1398         /* 'EDID' [R] */
1399         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1400                                  &acpi_video_device_EDID_fops,
1401                                  acpi_driver_data(device));
1402         if (!entry)
1403                 goto err_remove_brightness;
1404
1405         acpi_device_dir(device) = device_dir;
1406
1407         return 0;
1408
1409  err_remove_brightness:
1410         remove_proc_entry("brightness", device_dir);
1411  err_remove_state:
1412         remove_proc_entry("state", device_dir);
1413  err_remove_info:
1414         remove_proc_entry("info", device_dir);
1415  err_remove_dir:
1416         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1417         return -ENOMEM;
1418 }
1419
1420 static int acpi_video_device_remove_fs(struct acpi_device *device)
1421 {
1422         struct acpi_video_device *vid_dev;
1423         struct proc_dir_entry *device_dir;
1424
1425         vid_dev = acpi_driver_data(device);
1426         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1427                 return -ENODEV;
1428
1429         device_dir = acpi_device_dir(device);
1430         if (device_dir) {
1431                 remove_proc_entry("info", device_dir);
1432                 remove_proc_entry("state", device_dir);
1433                 remove_proc_entry("brightness", device_dir);
1434                 remove_proc_entry("EDID", device_dir);
1435                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1436                 acpi_device_dir(device) = NULL;
1437         }
1438
1439         return 0;
1440 }
1441
1442 /* video bus */
1443 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1444 {
1445         struct acpi_video_bus *video = seq->private;
1446
1447
1448         if (!video)
1449                 goto end;
1450
1451         seq_printf(seq, "Switching heads:              %s\n",
1452                    video->flags.multihead ? "yes" : "no");
1453         seq_printf(seq, "Video ROM:                    %s\n",
1454                    video->flags.rom ? "yes" : "no");
1455         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1456                    video->flags.post ? "yes" : "no");
1457
1458       end:
1459         return 0;
1460 }
1461
1462 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1463 {
1464         return single_open(file, acpi_video_bus_info_seq_show,
1465                            PDE(inode)->data);
1466 }
1467
1468 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1469 {
1470         struct acpi_video_bus *video = seq->private;
1471
1472
1473         if (!video)
1474                 goto end;
1475
1476         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1477         seq_printf(seq, "<TODO>\n");
1478
1479       end:
1480         return 0;
1481 }
1482
1483 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1484 {
1485         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1486 }
1487
1488 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1489 {
1490         struct acpi_video_bus *video = seq->private;
1491         unsigned long long options;
1492         int status;
1493
1494
1495         if (!video)
1496                 goto end;
1497
1498         status = acpi_video_bus_POST_options(video, &options);
1499         if (ACPI_SUCCESS(status)) {
1500                 if (!(options & 1)) {
1501                         printk(KERN_WARNING PREFIX
1502                                "The motherboard VGA device is not listed as a possible POST device.\n");
1503                         printk(KERN_WARNING PREFIX
1504                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1505                 }
1506                 printk(KERN_WARNING "%llx\n", options);
1507                 seq_printf(seq, "can POST: <integrated video>");
1508                 if (options & 2)
1509                         seq_printf(seq, " <PCI video>");
1510                 if (options & 4)
1511                         seq_printf(seq, " <AGP video>");
1512                 seq_putc(seq, '\n');
1513         } else
1514                 seq_printf(seq, "<not supported>\n");
1515       end:
1516         return 0;
1517 }
1518
1519 static int
1520 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1521 {
1522         return single_open(file, acpi_video_bus_POST_info_seq_show,
1523                            PDE(inode)->data);
1524 }
1525
1526 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1527 {
1528         struct acpi_video_bus *video = seq->private;
1529         int status;
1530         unsigned long long id;
1531
1532
1533         if (!video)
1534                 goto end;
1535
1536         status = acpi_video_bus_get_POST(video, &id);
1537         if (!ACPI_SUCCESS(status)) {
1538                 seq_printf(seq, "<not supported>\n");
1539                 goto end;
1540         }
1541         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1542
1543       end:
1544         return 0;
1545 }
1546
1547 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1548 {
1549         struct acpi_video_bus *video = seq->private;
1550
1551
1552         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1553
1554         return 0;
1555 }
1556
1557 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1558 {
1559         return single_open(file, acpi_video_bus_POST_seq_show,
1560                            PDE(inode)->data);
1561 }
1562
1563 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1564 {
1565         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1566 }
1567
1568 static ssize_t
1569 acpi_video_bus_write_POST(struct file *file,
1570                           const char __user * buffer,
1571                           size_t count, loff_t * data)
1572 {
1573         int status;
1574         struct seq_file *m = file->private_data;
1575         struct acpi_video_bus *video = m->private;
1576         char str[12] = { 0 };
1577         unsigned long long opt, options;
1578
1579
1580         if (!video || count >= sizeof(str))
1581                 return -EINVAL;
1582
1583         status = acpi_video_bus_POST_options(video, &options);
1584         if (!ACPI_SUCCESS(status))
1585                 return -EINVAL;
1586
1587         if (copy_from_user(str, buffer, count))
1588                 return -EFAULT;
1589
1590         str[count] = 0;
1591         opt = strtoul(str, NULL, 0);
1592         if (opt > 3)
1593                 return -EFAULT;
1594
1595         /* just in case an OEM 'forgot' the motherboard... */
1596         options |= 1;
1597
1598         if (options & (1ul << opt)) {
1599                 status = acpi_video_bus_set_POST(video, opt);
1600                 if (!ACPI_SUCCESS(status))
1601                         return -EFAULT;
1602
1603         }
1604
1605         return count;
1606 }
1607
1608 static ssize_t
1609 acpi_video_bus_write_DOS(struct file *file,
1610                          const char __user * buffer,
1611                          size_t count, loff_t * data)
1612 {
1613         int status;
1614         struct seq_file *m = file->private_data;
1615         struct acpi_video_bus *video = m->private;
1616         char str[12] = { 0 };
1617         unsigned long opt;
1618
1619
1620         if (!video || count >= sizeof(str))
1621                 return -EINVAL;
1622
1623         if (copy_from_user(str, buffer, count))
1624                 return -EFAULT;
1625
1626         str[count] = 0;
1627         opt = strtoul(str, NULL, 0);
1628         if (opt > 7)
1629                 return -EFAULT;
1630
1631         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1632
1633         if (!ACPI_SUCCESS(status))
1634                 return -EFAULT;
1635
1636         return count;
1637 }
1638
1639 static int acpi_video_bus_add_fs(struct acpi_device *device)
1640 {
1641         struct acpi_video_bus *video = acpi_driver_data(device);
1642         struct proc_dir_entry *device_dir;
1643         struct proc_dir_entry *entry;
1644
1645         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1646         if (!device_dir)
1647                 return -ENOMEM;
1648
1649         /* 'info' [R] */
1650         entry = proc_create_data("info", S_IRUGO, device_dir,
1651                                  &acpi_video_bus_info_fops,
1652                                  acpi_driver_data(device));
1653         if (!entry)
1654                 goto err_remove_dir;
1655
1656         /* 'ROM' [R] */
1657         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1658                                  &acpi_video_bus_ROM_fops,
1659                                  acpi_driver_data(device));
1660         if (!entry)
1661                 goto err_remove_info;
1662
1663         /* 'POST_info' [R] */
1664         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1665                                  &acpi_video_bus_POST_info_fops,
1666                                  acpi_driver_data(device));
1667         if (!entry)
1668                 goto err_remove_rom;
1669
1670         /* 'POST' [R/W] */
1671         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1672                                  device_dir,
1673                                  &acpi_video_bus_POST_fops,
1674                                  acpi_driver_data(device));
1675         if (!entry)
1676                 goto err_remove_post_info;
1677
1678         /* 'DOS' [R/W] */
1679         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1680                                  device_dir,
1681                                  &acpi_video_bus_DOS_fops,
1682                                  acpi_driver_data(device));
1683         if (!entry)
1684                 goto err_remove_post;
1685
1686         video->dir = acpi_device_dir(device) = device_dir;
1687         return 0;
1688
1689  err_remove_post:
1690         remove_proc_entry("POST", device_dir);
1691  err_remove_post_info:
1692         remove_proc_entry("POST_info", device_dir);
1693  err_remove_rom:
1694         remove_proc_entry("ROM", device_dir);
1695  err_remove_info:
1696         remove_proc_entry("info", device_dir);
1697  err_remove_dir:
1698         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1699         return -ENOMEM;
1700 }
1701
1702 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1703 {
1704         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1705
1706         if (device_dir) {
1707                 remove_proc_entry("info", device_dir);
1708                 remove_proc_entry("ROM", device_dir);
1709                 remove_proc_entry("POST_info", device_dir);
1710                 remove_proc_entry("POST", device_dir);
1711                 remove_proc_entry("DOS", device_dir);
1712                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1713                 acpi_device_dir(device) = NULL;
1714         }
1715
1716         return 0;
1717 }
1718
1719 /* --------------------------------------------------------------------------
1720                                  Driver Interface
1721    -------------------------------------------------------------------------- */
1722
1723 /* device interface */
1724 static struct acpi_video_device_attrib*
1725 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1726 {
1727         struct acpi_video_enumerated_device *ids;
1728         int i;
1729
1730         for (i = 0; i < video->attached_count; i++) {
1731                 ids = &video->attached_array[i];
1732                 if ((ids->value.int_val & 0xffff) == device_id)
1733                         return &ids->value.attrib;
1734         }
1735
1736         return NULL;
1737 }
1738
1739 static int
1740 acpi_video_bus_get_one_device(struct acpi_device *device,
1741                               struct acpi_video_bus *video)
1742 {
1743         unsigned long long device_id;
1744         int status;
1745         struct acpi_video_device *data;
1746         struct acpi_video_device_attrib* attribute;
1747
1748         if (!device || !video)
1749                 return -EINVAL;
1750
1751         status =
1752             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1753         if (ACPI_SUCCESS(status)) {
1754
1755                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1756                 if (!data)
1757                         return -ENOMEM;
1758
1759                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1760                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1761                 device->driver_data = data;
1762
1763                 data->device_id = device_id;
1764                 data->video = video;
1765                 data->dev = device;
1766
1767                 attribute = acpi_video_get_device_attr(video, device_id);
1768
1769                 if((attribute != NULL) && attribute->device_id_scheme) {
1770                         switch (attribute->display_type) {
1771                         case ACPI_VIDEO_DISPLAY_CRT:
1772                                 data->flags.crt = 1;
1773                                 break;
1774                         case ACPI_VIDEO_DISPLAY_TV:
1775                                 data->flags.tvout = 1;
1776                                 break;
1777                         case ACPI_VIDEO_DISPLAY_DVI:
1778                                 data->flags.dvi = 1;
1779                                 break;
1780                         case ACPI_VIDEO_DISPLAY_LCD:
1781                                 data->flags.lcd = 1;
1782                                 break;
1783                         default:
1784                                 data->flags.unknown = 1;
1785                                 break;
1786                         }
1787                         if(attribute->bios_can_detect)
1788                                 data->flags.bios = 1;
1789                 } else
1790                         data->flags.unknown = 1;
1791
1792                 acpi_video_device_bind(video, data);
1793                 acpi_video_device_find_cap(data);
1794
1795                 status = acpi_install_notify_handler(device->handle,
1796                                                      ACPI_DEVICE_NOTIFY,
1797                                                      acpi_video_device_notify,
1798                                                      data);
1799                 if (ACPI_FAILURE(status)) {
1800                         printk(KERN_ERR PREFIX
1801                                           "Error installing notify handler\n");
1802                         if(data->brightness)
1803                                 kfree(data->brightness->levels);
1804                         kfree(data->brightness);
1805                         kfree(data);
1806                         return -ENODEV;
1807                 }
1808
1809                 mutex_lock(&video->device_list_lock);
1810                 list_add_tail(&data->entry, &video->video_device_list);
1811                 mutex_unlock(&video->device_list_lock);
1812
1813                 acpi_video_device_add_fs(device);
1814
1815                 return 0;
1816         }
1817
1818         return -ENOENT;
1819 }
1820
1821 /*
1822  *  Arg:
1823  *      video   : video bus device
1824  *
1825  *  Return:
1826  *      none
1827  *
1828  *  Enumerate the video device list of the video bus,
1829  *  bind the ids with the corresponding video devices
1830  *  under the video bus.
1831  */
1832
1833 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1834 {
1835         struct acpi_video_device *dev;
1836
1837         mutex_lock(&video->device_list_lock);
1838
1839         list_for_each_entry(dev, &video->video_device_list, entry)
1840                 acpi_video_device_bind(video, dev);
1841
1842         mutex_unlock(&video->device_list_lock);
1843 }
1844
1845 /*
1846  *  Arg:
1847  *      video   : video bus device
1848  *      device  : video output device under the video
1849  *              bus
1850  *
1851  *  Return:
1852  *      none
1853  *
1854  *  Bind the ids with the corresponding video devices
1855  *  under the video bus.
1856  */
1857
1858 static void
1859 acpi_video_device_bind(struct acpi_video_bus *video,
1860                        struct acpi_video_device *device)
1861 {
1862         struct acpi_video_enumerated_device *ids;
1863         int i;
1864
1865         for (i = 0; i < video->attached_count; i++) {
1866                 ids = &video->attached_array[i];
1867                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1868                         ids->bind_info = device;
1869                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1870                 }
1871         }
1872 }
1873
1874 /*
1875  *  Arg:
1876  *      video   : video bus device
1877  *
1878  *  Return:
1879  *      < 0     : error
1880  *
1881  *  Call _DOD to enumerate all devices attached to display adapter
1882  *
1883  */
1884
1885 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1886 {
1887         int status;
1888         int count;
1889         int i;
1890         struct acpi_video_enumerated_device *active_list;
1891         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1892         union acpi_object *dod = NULL;
1893         union acpi_object *obj;
1894
1895         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1896         if (!ACPI_SUCCESS(status)) {
1897                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1898                 return status;
1899         }
1900
1901         dod = buffer.pointer;
1902         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1903                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1904                 status = -EFAULT;
1905                 goto out;
1906         }
1907
1908         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1909                           dod->package.count));
1910
1911         active_list = kcalloc(1 + dod->package.count,
1912                               sizeof(struct acpi_video_enumerated_device),
1913                               GFP_KERNEL);
1914         if (!active_list) {
1915                 status = -ENOMEM;
1916                 goto out;
1917         }
1918
1919         count = 0;
1920         for (i = 0; i < dod->package.count; i++) {
1921                 obj = &dod->package.elements[i];
1922
1923                 if (obj->type != ACPI_TYPE_INTEGER) {
1924                         printk(KERN_ERR PREFIX
1925                                 "Invalid _DOD data in element %d\n", i);
1926                         continue;
1927                 }
1928
1929                 active_list[count].value.int_val = obj->integer.value;
1930                 active_list[count].bind_info = NULL;
1931                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1932                                   (int)obj->integer.value));
1933                 count++;
1934         }
1935
1936         kfree(video->attached_array);
1937
1938         video->attached_array = active_list;
1939         video->attached_count = count;
1940
1941  out:
1942         kfree(buffer.pointer);
1943         return status;
1944 }
1945
1946 static int
1947 acpi_video_get_next_level(struct acpi_video_device *device,
1948                           u32 level_current, u32 event)
1949 {
1950         int min, max, min_above, max_below, i, l, delta = 255;
1951         max = max_below = 0;
1952         min = min_above = 255;
1953         /* Find closest level to level_current */
1954         for (i = 2; i < device->brightness->count; i++) {
1955                 l = device->brightness->levels[i];
1956                 if (abs(l - level_current) < abs(delta)) {
1957                         delta = l - level_current;
1958                         if (!delta)
1959                                 break;
1960                 }
1961         }
1962         /* Ajust level_current to closest available level */
1963         level_current += delta;
1964         for (i = 2; i < device->brightness->count; i++) {
1965                 l = device->brightness->levels[i];
1966                 if (l < min)
1967                         min = l;
1968                 if (l > max)
1969                         max = l;
1970                 if (l < min_above && l > level_current)
1971                         min_above = l;
1972                 if (l > max_below && l < level_current)
1973                         max_below = l;
1974         }
1975
1976         switch (event) {
1977         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1978                 return (level_current < max) ? min_above : min;
1979         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1980                 return (level_current < max) ? min_above : max;
1981         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1982                 return (level_current > min) ? max_below : min;
1983         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1984         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1985                 return 0;
1986         default:
1987                 return level_current;
1988         }
1989 }
1990
1991 static int
1992 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1993 {
1994         unsigned long long level_current, level_next;
1995         int result = -EINVAL;
1996
1997         /* no warning message if acpi_backlight=vendor is used */
1998         if (!acpi_video_backlight_support())
1999                 return 0;
2000
2001         if (!device->brightness)
2002                 goto out;
2003
2004         result = acpi_video_device_lcd_get_level_current(device,
2005                                                          &level_current, 0);
2006         if (result)
2007                 goto out;
2008
2009         level_next = acpi_video_get_next_level(device, level_current, event);
2010
2011         result = acpi_video_device_lcd_set_level(device, level_next);
2012
2013         if (!result)
2014                 backlight_force_update(device->backlight,
2015                                        BACKLIGHT_UPDATE_HOTKEY);
2016
2017 out:
2018         if (result)
2019                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2020
2021         return result;
2022 }
2023
2024 static int
2025 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2026                            struct acpi_device *device)
2027 {
2028         int status = 0;
2029         struct acpi_device *dev;
2030
2031         acpi_video_device_enumerate(video);
2032
2033         list_for_each_entry(dev, &device->children, node) {
2034
2035                 status = acpi_video_bus_get_one_device(dev, video);
2036                 if (ACPI_FAILURE(status)) {
2037                         printk(KERN_WARNING PREFIX
2038                                         "Cant attach device");
2039                         continue;
2040                 }
2041         }
2042         return status;
2043 }
2044
2045 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2046 {
2047         acpi_status status;
2048         struct acpi_video_bus *video;
2049
2050
2051         if (!device || !device->video)
2052                 return -ENOENT;
2053
2054         video = device->video;
2055
2056         acpi_video_device_remove_fs(device->dev);
2057
2058         status = acpi_remove_notify_handler(device->dev->handle,
2059                                             ACPI_DEVICE_NOTIFY,
2060                                             acpi_video_device_notify);
2061         if (device->backlight) {
2062                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2063                 backlight_device_unregister(device->backlight);
2064                 device->backlight = NULL;
2065         }
2066         if (device->cooling_dev) {
2067                 sysfs_remove_link(&device->dev->dev.kobj,
2068                                   "thermal_cooling");
2069                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2070                                   "device");
2071                 thermal_cooling_device_unregister(device->cooling_dev);
2072                 device->cooling_dev = NULL;
2073         }
2074         video_output_unregister(device->output_dev);
2075
2076         return 0;
2077 }
2078
2079 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2080 {
2081         int status;
2082         struct acpi_video_device *dev, *next;
2083
2084         mutex_lock(&video->device_list_lock);
2085
2086         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2087
2088                 status = acpi_video_bus_put_one_device(dev);
2089                 if (ACPI_FAILURE(status))
2090                         printk(KERN_WARNING PREFIX
2091                                "hhuuhhuu bug in acpi video driver.\n");
2092
2093                 if (dev->brightness) {
2094                         kfree(dev->brightness->levels);
2095                         kfree(dev->brightness);
2096                 }
2097                 list_del(&dev->entry);
2098                 kfree(dev);
2099         }
2100
2101         mutex_unlock(&video->device_list_lock);
2102
2103         return 0;
2104 }
2105
2106 /* acpi_video interface */
2107
2108 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2109 {
2110         return acpi_video_bus_DOS(video, 0, 0);
2111 }
2112
2113 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2114 {
2115         return acpi_video_bus_DOS(video, 0, 1);
2116 }
2117
2118 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2119 {
2120         struct acpi_video_bus *video = acpi_driver_data(device);
2121         struct input_dev *input;
2122         int keycode;
2123
2124         if (!video)
2125                 return;
2126
2127         input = video->input;
2128
2129         switch (event) {
2130         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2131                                          * most likely via hotkey. */
2132                 acpi_bus_generate_proc_event(device, event, 0);
2133                 keycode = KEY_SWITCHVIDEOMODE;
2134                 break;
2135
2136         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2137                                          * connector. */
2138                 acpi_video_device_enumerate(video);
2139                 acpi_video_device_rebind(video);
2140                 acpi_bus_generate_proc_event(device, event, 0);
2141                 keycode = KEY_SWITCHVIDEOMODE;
2142                 break;
2143
2144         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2145                 acpi_bus_generate_proc_event(device, event, 0);
2146                 keycode = KEY_SWITCHVIDEOMODE;
2147                 break;
2148         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2149                 acpi_bus_generate_proc_event(device, event, 0);
2150                 keycode = KEY_VIDEO_NEXT;
2151                 break;
2152         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2153                 acpi_bus_generate_proc_event(device, event, 0);
2154                 keycode = KEY_VIDEO_PREV;
2155                 break;
2156
2157         default:
2158                 keycode = KEY_UNKNOWN;
2159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2160                                   "Unsupported event [0x%x]\n", event));
2161                 break;
2162         }
2163
2164         acpi_notifier_call_chain(device, event, 0);
2165         input_report_key(input, keycode, 1);
2166         input_sync(input);
2167         input_report_key(input, keycode, 0);
2168         input_sync(input);
2169
2170         return;
2171 }
2172
2173 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2174 {
2175         struct acpi_video_device *video_device = data;
2176         struct acpi_device *device = NULL;
2177         struct acpi_video_bus *bus;
2178         struct input_dev *input;
2179         int keycode;
2180
2181         if (!video_device)
2182                 return;
2183
2184         device = video_device->dev;
2185         bus = video_device->video;
2186         input = bus->input;
2187
2188         switch (event) {
2189         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2190                 if (brightness_switch_enabled)
2191                         acpi_video_switch_brightness(video_device, event);
2192                 acpi_bus_generate_proc_event(device, event, 0);
2193                 keycode = KEY_BRIGHTNESS_CYCLE;
2194                 break;
2195         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2196                 if (brightness_switch_enabled)
2197                         acpi_video_switch_brightness(video_device, event);
2198                 acpi_bus_generate_proc_event(device, event, 0);
2199                 keycode = KEY_BRIGHTNESSUP;
2200                 break;
2201         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2202                 if (brightness_switch_enabled)
2203                         acpi_video_switch_brightness(video_device, event);
2204                 acpi_bus_generate_proc_event(device, event, 0);
2205                 keycode = KEY_BRIGHTNESSDOWN;
2206                 break;
2207         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2208                 if (brightness_switch_enabled)
2209                         acpi_video_switch_brightness(video_device, event);
2210                 acpi_bus_generate_proc_event(device, event, 0);
2211                 keycode = KEY_BRIGHTNESS_ZERO;
2212                 break;
2213         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2214                 if (brightness_switch_enabled)
2215                         acpi_video_switch_brightness(video_device, event);
2216                 acpi_bus_generate_proc_event(device, event, 0);
2217                 keycode = KEY_DISPLAY_OFF;
2218                 break;
2219         default:
2220                 keycode = KEY_UNKNOWN;
2221                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2222                                   "Unsupported event [0x%x]\n", event));
2223                 break;
2224         }
2225
2226         acpi_notifier_call_chain(device, event, 0);
2227         input_report_key(input, keycode, 1);
2228         input_sync(input);
2229         input_report_key(input, keycode, 0);
2230         input_sync(input);
2231
2232         return;
2233 }
2234
2235 static int instance;
2236 static int acpi_video_resume(struct acpi_device *device)
2237 {
2238         struct acpi_video_bus *video;
2239         struct acpi_video_device *video_device;
2240         int i;
2241
2242         if (!device || !acpi_driver_data(device))
2243                 return -EINVAL;
2244
2245         video = acpi_driver_data(device);
2246
2247         for (i = 0; i < video->attached_count; i++) {
2248                 video_device = video->attached_array[i].bind_info;
2249                 if (video_device && video_device->backlight)
2250                         acpi_video_set_brightness(video_device->backlight);
2251         }
2252         return AE_OK;
2253 }
2254
2255 static acpi_status
2256 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2257                         void **return_value)
2258 {
2259         struct acpi_device *device = context;
2260         struct acpi_device *sibling;
2261         int result;
2262
2263         if (handle == device->handle)
2264                 return AE_CTRL_TERMINATE;
2265
2266         result = acpi_bus_get_device(handle, &sibling);
2267         if (result)
2268                 return AE_OK;
2269
2270         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2271                         return AE_ALREADY_EXISTS;
2272
2273         return AE_OK;
2274 }
2275
2276 static int acpi_video_bus_add(struct acpi_device *device)
2277 {
2278         struct acpi_video_bus *video;
2279         struct input_dev *input;
2280         int error;
2281         acpi_status status;
2282
2283         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2284                                 device->parent->handle, 1,
2285                                 acpi_video_bus_match, NULL,
2286                                 device, NULL);
2287         if (status == AE_ALREADY_EXISTS) {
2288                 printk(KERN_WARNING FW_BUG
2289                         "Duplicate ACPI video bus devices for the"
2290                         " same VGA controller, please try module "
2291                         "parameter \"video.allow_duplicates=1\""
2292                         "if the current driver doesn't work.\n");
2293                 if (!allow_duplicates)
2294                         return -ENODEV;
2295         }
2296
2297         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2298         if (!video)
2299                 return -ENOMEM;
2300
2301         /* a hack to fix the duplicate name "VID" problem on T61 */
2302         if (!strcmp(device->pnp.bus_id, "VID")) {
2303                 if (instance)
2304                         device->pnp.bus_id[3] = '0' + instance;
2305                 instance ++;
2306         }
2307         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2308         if (!strcmp(device->pnp.bus_id, "VGA")) {
2309                 if (instance)
2310                         device->pnp.bus_id[3] = '0' + instance;
2311                 instance++;
2312         }
2313
2314         video->device = device;
2315         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2316         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2317         device->driver_data = video;
2318
2319         acpi_video_bus_find_cap(video);
2320         error = acpi_video_bus_check(video);
2321         if (error)
2322                 goto err_free_video;
2323
2324         error = acpi_video_bus_add_fs(device);
2325         if (error)
2326                 goto err_free_video;
2327
2328         mutex_init(&video->device_list_lock);
2329         INIT_LIST_HEAD(&video->video_device_list);
2330
2331         acpi_video_bus_get_devices(video, device);
2332         acpi_video_bus_start_devices(video);
2333
2334         video->input = input = input_allocate_device();
2335         if (!input) {
2336                 error = -ENOMEM;
2337                 goto err_stop_video;
2338         }
2339
2340         snprintf(video->phys, sizeof(video->phys),
2341                 "%s/video/input0", acpi_device_hid(video->device));
2342
2343         input->name = acpi_device_name(video->device);
2344         input->phys = video->phys;
2345         input->id.bustype = BUS_HOST;
2346         input->id.product = 0x06;
2347         input->dev.parent = &device->dev;
2348         input->evbit[0] = BIT(EV_KEY);
2349         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2350         set_bit(KEY_VIDEO_NEXT, input->keybit);
2351         set_bit(KEY_VIDEO_PREV, input->keybit);
2352         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2353         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2354         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2355         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2356         set_bit(KEY_DISPLAY_OFF, input->keybit);
2357         set_bit(KEY_UNKNOWN, input->keybit);
2358
2359         error = input_register_device(input);
2360         if (error)
2361                 goto err_free_input_dev;
2362
2363         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2364                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2365                video->flags.multihead ? "yes" : "no",
2366                video->flags.rom ? "yes" : "no",
2367                video->flags.post ? "yes" : "no");
2368
2369         return 0;
2370
2371  err_free_input_dev:
2372         input_free_device(input);
2373  err_stop_video:
2374         acpi_video_bus_stop_devices(video);
2375         acpi_video_bus_put_devices(video);
2376         kfree(video->attached_array);
2377         acpi_video_bus_remove_fs(device);
2378  err_free_video:
2379         kfree(video);
2380         device->driver_data = NULL;
2381
2382         return error;
2383 }
2384
2385 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2386 {
2387         struct acpi_video_bus *video = NULL;
2388
2389
2390         if (!device || !acpi_driver_data(device))
2391                 return -EINVAL;
2392
2393         video = acpi_driver_data(device);
2394
2395         acpi_video_bus_stop_devices(video);
2396         acpi_video_bus_put_devices(video);
2397         acpi_video_bus_remove_fs(device);
2398
2399         input_unregister_device(video->input);
2400         kfree(video->attached_array);
2401         kfree(video);
2402
2403         return 0;
2404 }
2405
2406 static int __init intel_opregion_present(void)
2407 {
2408 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2409         struct pci_dev *dev = NULL;
2410         u32 address;
2411
2412         for_each_pci_dev(dev) {
2413                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2414                         continue;
2415                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2416                         continue;
2417                 pci_read_config_dword(dev, 0xfc, &address);
2418                 if (!address)
2419                         continue;
2420                 return 1;
2421         }
2422 #endif
2423         return 0;
2424 }
2425
2426 int acpi_video_register(void)
2427 {
2428         int result = 0;
2429         if (register_count) {
2430                 /*
2431                  * if the function of acpi_video_register is already called,
2432                  * don't register the acpi_vide_bus again and return no error.
2433                  */
2434                 return 0;
2435         }
2436
2437         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2438         if (!acpi_video_dir)
2439                 return -ENODEV;
2440
2441         result = acpi_bus_register_driver(&acpi_video_bus);
2442         if (result < 0) {
2443                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2444                 return -ENODEV;
2445         }
2446
2447         /*
2448          * When the acpi_video_bus is loaded successfully, increase
2449          * the counter reference.
2450          */
2451         register_count = 1;
2452
2453         return 0;
2454 }
2455 EXPORT_SYMBOL(acpi_video_register);
2456
2457 void acpi_video_unregister(void)
2458 {
2459         if (!register_count) {
2460                 /*
2461                  * If the acpi video bus is already unloaded, don't
2462                  * unload it again and return directly.
2463                  */
2464                 return;
2465         }
2466         acpi_bus_unregister_driver(&acpi_video_bus);
2467
2468         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2469
2470         register_count = 0;
2471
2472         return;
2473 }
2474 EXPORT_SYMBOL(acpi_video_unregister);
2475
2476 /*
2477  * This is kind of nasty. Hardware using Intel chipsets may require
2478  * the video opregion code to be run first in order to initialise
2479  * state before any ACPI video calls are made. To handle this we defer
2480  * registration of the video class until the opregion code has run.
2481  */
2482
2483 static int __init acpi_video_init(void)
2484 {
2485         dmi_check_system(video_dmi_table);
2486
2487         if (intel_opregion_present())
2488                 return 0;
2489
2490         return acpi_video_register();
2491 }
2492
2493 static void __exit acpi_video_exit(void)
2494 {
2495         acpi_video_unregister();
2496
2497         return;
2498 }
2499
2500 module_init(acpi_video_init);
2501 module_exit(acpi_video_exit);