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