drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <linux/slab.h>
  43 #include <asm/uaccess.h>
  44 #include <linux/dmi.h>
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47 #include <linux/suspend.h>
  48 #include <acpi/video.h>
  49
  50 #define PREFIX "ACPI: "
  51
  52 #define ACPI_VIDEO_CLASS                "video"
  53 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  54 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  55 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  56 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  57 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  58 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  59 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  60
  61 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  62 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  63 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  64 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  65 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  66
  67 #define MAX_NAME_LEN    20
  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 /*
  80  * By default, we don't allow duplicate ACPI video bus devices
  81  * under the same VGA controller
  82  */
  83 static int allow_duplicates;
  84 module_param(allow_duplicates, bool, 0644);
  85
  86 static int register_count = 0;
  87 static int acpi_video_bus_add(struct acpi_device *device);
  88 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  89 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  90
  91 static const struct acpi_device_id video_device_ids[] = {
  92         {ACPI_VIDEO_HID, 0},
  93         {"", 0},
  94 };
  95 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  96
  97 static struct acpi_driver acpi_video_bus = {
  98         .name = "video",
  99         .class = ACPI_VIDEO_CLASS,
 100         .ids = video_device_ids,
 101         .ops = {
 102                 .add = acpi_video_bus_add,
 103                 .remove = acpi_video_bus_remove,
 104                 .notify = acpi_video_bus_notify,
 105                 },
 106 };
 107
 108 struct acpi_video_bus_flags {
 109         u8 multihead:1;         /* can switch video heads */
 110         u8 rom:1;               /* can retrieve a video rom */
 111         u8 post:1;              /* can configure the head to */
 112         u8 reserved:5;
 113 };
 114
 115 struct acpi_video_bus_cap {
 116         u8 _DOS:1;              /*Enable/Disable output switching */
 117         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 118         u8 _ROM:1;              /*Get ROM Data */
 119         u8 _GPD:1;              /*Get POST Device */
 120         u8 _SPD:1;              /*Set POST Device */
 121         u8 _VPO:1;              /*Video POST Options */
 122         u8 reserved:2;
 123 };
 124
 125 struct acpi_video_device_attrib {
 126         u32 display_index:4;    /* A zero-based instance of the Display */
 127         u32 display_port_attachment:4;  /*This field differentiates the display type */
 128         u32 display_type:4;     /*Describe the specific type in use */
 129         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 130         u32 bios_can_detect:1;  /*BIOS can detect the device */
 131         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 132                                    the VGA device. */
 133         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 134         u32 reserved:10;        /*Must be 0 */
 135         u32 device_id_scheme:1; /*Device ID Scheme */
 136 };
 137
 138 struct acpi_video_enumerated_device {
 139         union {
 140                 u32 int_val;
 141                 struct acpi_video_device_attrib attrib;
 142         } value;
 143         struct acpi_video_device *bind_info;
 144 };
 145
 146 struct acpi_video_bus {
 147         struct acpi_device *device;
 148         u8 dos_setting;
 149         struct acpi_video_enumerated_device *attached_array;
 150         u8 attached_count;
 151         struct acpi_video_bus_cap cap;
 152         struct acpi_video_bus_flags flags;
 153         struct list_head video_device_list;
 154         struct mutex device_list_lock;  /* protects video_device_list */
 155 #ifdef CONFIG_ACPI_PROCFS
 156         struct proc_dir_entry *dir;
 157 #endif
 158         struct input_dev *input;
 159         char phys[32];  /* for input device */
 160         struct notifier_block pm_nb;
 161 };
 162
 163 struct acpi_video_device_flags {
 164         u8 crt:1;
 165         u8 lcd:1;
 166         u8 tvout:1;
 167         u8 dvi:1;
 168         u8 bios:1;
 169         u8 unknown:1;
 170         u8 reserved:2;
 171 };
 172
 173 struct acpi_video_device_cap {
 174         u8 _ADR:1;              /*Return the unique ID */
 175         u8 _BCL:1;              /*Query list of brightness control levels supported */
 176         u8 _BCM:1;              /*Set the brightness level */
 177         u8 _BQC:1;              /* Get current brightness level */
 178         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 179         u8 _DDC:1;              /*Return the EDID for this device */
 180         u8 _DCS:1;              /*Return status of output device */
 181         u8 _DGS:1;              /*Query graphics state */
 182         u8 _DSS:1;              /*Device state set */
 183 };
 184
 185 struct acpi_video_brightness_flags {
 186         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 187         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 188         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 189         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 190         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 191 };
 192
 193 struct acpi_video_device_brightness {
 194         int curr;
 195         int count;
 196         int *levels;
 197         struct acpi_video_brightness_flags flags;
 198 };
 199
 200 struct acpi_video_device {
 201         unsigned long device_id;
 202         struct acpi_video_device_flags flags;
 203         struct acpi_video_device_cap cap;
 204         struct list_head entry;
 205         struct acpi_video_bus *video;
 206         struct acpi_device *dev;
 207         struct acpi_video_device_brightness *brightness;
 208         struct backlight_device *backlight;
 209         struct thermal_cooling_device *cooling_dev;
 210         struct output_device *output_dev;
 211 };
 212
 213 #ifdef CONFIG_ACPI_PROCFS
 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 #endif /* CONFIG_ACPI_PROCFS */
 314
 315 static const char device_decode[][30] = {
 316         "motherboard VGA device",
 317         "PCI VGA device",
 318         "AGP VGA device",
 319         "UNKNOWN",
 320 };
 321
 322 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 323 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 324 static void acpi_video_device_bind(struct acpi_video_bus *video,
 325                                    struct acpi_video_device *device);
 326 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 327 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 328                         int level);
 329 static int acpi_video_device_lcd_get_level_current(
 330                         struct acpi_video_device *device,
 331                         unsigned long long *level, int init);
 332 static int acpi_video_get_next_level(struct acpi_video_device *device,
 333                                      u32 level_current, u32 event);
 334 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 335                                          int event);
 336 static int acpi_video_device_get_state(struct acpi_video_device *device,
 337                             unsigned long long *state);
 338 static int acpi_video_output_get(struct output_device *od);
 339 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 340
 341 /*backlight device sysfs support*/
 342 static int acpi_video_get_brightness(struct backlight_device *bd)
 343 {
 344         unsigned long long cur_level;
 345         int i;
 346         struct acpi_video_device *vd =
 347                 (struct acpi_video_device *)bl_get_data(bd);
 348
 349         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 350                 return -EINVAL;
 351         for (i = 2; i < vd->brightness->count; i++) {
 352                 if (vd->brightness->levels[i] == cur_level)
 353                         /* The first two entries are special - see page 575
 354                            of the ACPI spec 3.0 */
 355                         return i-2;
 356         }
 357         return 0;
 358 }
 359
 360 static int acpi_video_set_brightness(struct backlight_device *bd)
 361 {
 362         int request_level = bd->props.brightness + 2;
 363         struct acpi_video_device *vd =
 364                 (struct acpi_video_device *)bl_get_data(bd);
 365
 366         return acpi_video_device_lcd_set_level(vd,
 367                                 vd->brightness->levels[request_level]);
 368 }
 369
 370 static struct backlight_ops acpi_backlight_ops = {
 371         .get_brightness = acpi_video_get_brightness,
 372         .update_status  = acpi_video_set_brightness,
 373 };
 374
 375 /*video output device sysfs support*/
 376 static int acpi_video_output_get(struct output_device *od)
 377 {
 378         unsigned long long state;
 379         struct acpi_video_device *vd =
 380                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 381         acpi_video_device_get_state(vd, &state);
 382         return (int)state;
 383 }
 384
 385 static int acpi_video_output_set(struct output_device *od)
 386 {
 387         unsigned long state = od->request_state;
 388         struct acpi_video_device *vd=
 389                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 390         return acpi_video_device_set_state(vd, state);
 391 }
 392
 393 static struct output_properties acpi_output_properties = {
 394         .set_state = acpi_video_output_set,
 395         .get_status = acpi_video_output_get,
 396 };
 397
 398
 399 /* thermal cooling device callbacks */
 400 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 401                                long *state)
 402 {
 403         struct acpi_device *device = cooling_dev->devdata;
 404         struct acpi_video_device *video = acpi_driver_data(device);
 405
 406         *state = video->brightness->count - 3;
 407         return 0;
 408 }
 409
 410 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 411                                long *state)
 412 {
 413         struct acpi_device *device = cooling_dev->devdata;
 414         struct acpi_video_device *video = acpi_driver_data(device);
 415         unsigned long long level;
 416         int offset;
 417
 418         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 419                 return -EINVAL;
 420         for (offset = 2; offset < video->brightness->count; offset++)
 421                 if (level == video->brightness->levels[offset]) {
 422                         *state = video->brightness->count - offset - 1;
 423                         return 0;
 424                 }
 425
 426         return -EINVAL;
 427 }
 428
 429 static int
 430 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 431 {
 432         struct acpi_device *device = cooling_dev->devdata;
 433         struct acpi_video_device *video = acpi_driver_data(device);
 434         int level;
 435
 436         if ( state >= video->brightness->count - 2)
 437                 return -EINVAL;
 438
 439         state = video->brightness->count - state;
 440         level = video->brightness->levels[state -1];
 441         return acpi_video_device_lcd_set_level(video, level);
 442 }
 443
 444 static struct thermal_cooling_device_ops video_cooling_ops = {
 445         .get_max_state = video_get_max_state,
 446         .get_cur_state = video_get_cur_state,
 447         .set_cur_state = video_set_cur_state,
 448 };
 449
 450 /* --------------------------------------------------------------------------
 451                                Video Management
 452    -------------------------------------------------------------------------- */
 453
 454 /* device */
 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, int init)
 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                         if (!init) {
 628                                 /*
 629                                  * BQC returned an invalid level.
 630                                  * Stop using it.
 631                                  */
 632                                 ACPI_WARNING((AE_INFO,
 633                                               "%s returned an invalid level",
 634                                               buf));
 635                                 device->cap._BQC = device->cap._BCQ = 0;
 636                         }
 637                 } else {
 638                         /* Fixme:
 639                          * should we return an error or ignore this failure?
 640                          * dev->brightness->curr is a cached value which stores
 641                          * the correct current backlight level in most cases.
 642                          * ACPI video backlight still works w/ buggy _BQC.
 643                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 644                          */
 645                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 646                         device->cap._BQC = device->cap._BCQ = 0;
 647                 }
 648         }
 649
 650         *level = device->brightness->curr;
 651         return 0;
 652 }
 653
 654 static int
 655 acpi_video_device_EDID(struct acpi_video_device *device,
 656                        union acpi_object **edid, ssize_t length)
 657 {
 658         int status;
 659         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 660         union acpi_object *obj;
 661         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 662         struct acpi_object_list args = { 1, &arg0 };
 663
 664
 665         *edid = NULL;
 666
 667         if (!device)
 668                 return -ENODEV;
 669         if (length == 128)
 670                 arg0.integer.value = 1;
 671         else if (length == 256)
 672                 arg0.integer.value = 2;
 673         else
 674                 return -EINVAL;
 675
 676         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 677         if (ACPI_FAILURE(status))
 678                 return -ENODEV;
 679
 680         obj = buffer.pointer;
 681
 682         if (obj && obj->type == ACPI_TYPE_BUFFER)
 683                 *edid = obj;
 684         else {
 685                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 686                 status = -EFAULT;
 687                 kfree(obj);
 688         }
 689
 690         return status;
 691 }
 692
 693 /* bus */
 694
 695 /*
 696  *  Arg:
 697  *      video           : video bus device pointer
 698  *      bios_flag       :
 699  *              0.      The system BIOS should NOT automatically switch(toggle)
 700  *                      the active display output.
 701  *              1.      The system BIOS should automatically switch (toggle) the
 702  *                      active display output. No switch event.
 703  *              2.      The _DGS value should be locked.
 704  *              3.      The system BIOS should not automatically switch (toggle) the
 705  *                      active display output, but instead generate the display switch
 706  *                      event notify code.
 707  *      lcd_flag        :
 708  *              0.      The system BIOS should automatically control the brightness level
 709  *                      of the LCD when the power changes from AC to DC
 710  *              1.      The system BIOS should NOT automatically control the brightness
 711  *                      level of the LCD when the power changes from AC to DC.
 712  * Return Value:
 713  *              -1      wrong arg.
 714  */
 715
 716 static int
 717 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 718 {
 719         u64 status = 0;
 720         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 721         struct acpi_object_list args = { 1, &arg0 };
 722
 723
 724         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 725                 status = -1;
 726                 goto Failed;
 727         }
 728         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 729         video->dos_setting = arg0.integer.value;
 730         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 731
 732       Failed:
 733         return status;
 734 }
 735
 736 /*
 737  * Simple comparison function used to sort backlight levels.
 738  */
 739
 740 static int
 741 acpi_video_cmp_level(const void *a, const void *b)
 742 {
 743         return *(int *)a - *(int *)b;
 744 }
 745
 746 /*
 747  *  Arg:
 748  *      device  : video output device (LCD, CRT, ..)
 749  *
 750  *  Return Value:
 751  *      Maximum brightness level
 752  *
 753  *  Allocate and initialize device->brightness.
 754  */
 755
 756 static int
 757 acpi_video_init_brightness(struct acpi_video_device *device)
 758 {
 759         union acpi_object *obj = NULL;
 760         int i, max_level = 0, count = 0, level_ac_battery = 0;
 761         unsigned long long level, level_old;
 762         union acpi_object *o;
 763         struct acpi_video_device_brightness *br = NULL;
 764         int result = -EINVAL;
 765
 766         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 767                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 768                                                 "LCD brightness level\n"));
 769                 goto out;
 770         }
 771
 772         if (obj->package.count < 2)
 773                 goto out;
 774
 775         br = kzalloc(sizeof(*br), GFP_KERNEL);
 776         if (!br) {
 777                 printk(KERN_ERR "can't allocate memory\n");
 778                 result = -ENOMEM;
 779                 goto out;
 780         }
 781
 782         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 783                                 GFP_KERNEL);
 784         if (!br->levels) {
 785                 result = -ENOMEM;
 786                 goto out_free;
 787         }
 788
 789         for (i = 0; i < obj->package.count; i++) {
 790                 o = (union acpi_object *)&obj->package.elements[i];
 791                 if (o->type != ACPI_TYPE_INTEGER) {
 792                         printk(KERN_ERR PREFIX "Invalid data\n");
 793                         continue;
 794                 }
 795                 br->levels[count] = (u32) o->integer.value;
 796
 797                 if (br->levels[count] > max_level)
 798                         max_level = br->levels[count];
 799                 count++;
 800         }
 801
 802         /*
 803          * some buggy BIOS don't export the levels
 804          * when machine is on AC/Battery in _BCL package.
 805          * In this case, the first two elements in _BCL packages
 806          * are also supported brightness levels that OS should take care of.
 807          */
 808         for (i = 2; i < count; i++) {
 809                 if (br->levels[i] == br->levels[0])
 810                         level_ac_battery++;
 811                 if (br->levels[i] == br->levels[1])
 812                         level_ac_battery++;
 813         }
 814
 815         if (level_ac_battery < 2) {
 816                 level_ac_battery = 2 - level_ac_battery;
 817                 br->flags._BCL_no_ac_battery_levels = 1;
 818                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 819                         br->levels[i] = br->levels[i - level_ac_battery];
 820                 count += level_ac_battery;
 821         } else if (level_ac_battery > 2)
 822                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 823
 824         /* Check if the _BCL package is in a reversed order */
 825         if (max_level == br->levels[2]) {
 826                 br->flags._BCL_reversed = 1;
 827                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 828                         acpi_video_cmp_level, NULL);
 829         } else if (max_level != br->levels[count - 1])
 830                 ACPI_ERROR((AE_INFO,
 831                             "Found unordered _BCL package\n"));
 832
 833         br->count = count;
 834         device->brightness = br;
 835
 836         /* Check the input/output of _BQC/_BCL/_BCM */
 837         if ((max_level < 100) && (max_level <= (count - 2)))
 838                 br->flags._BCL_use_index = 1;
 839
 840         /*
 841          * _BCM is always consistent with _BCL,
 842          * at least for all the laptops we have ever seen.
 843          */
 844         br->flags._BCM_use_index = br->flags._BCL_use_index;
 845
 846         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 847         br->curr = level = max_level;
 848
 849         if (!device->cap._BQC)
 850                 goto set_level;
 851
 852         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 853         if (result)
 854                 goto out_free_levels;
 855
 856         /*
 857          * Set the level to maximum and check if _BQC uses indexed value
 858          */
 859         result = acpi_video_device_lcd_set_level(device, max_level);
 860         if (result)
 861                 goto out_free_levels;
 862
 863         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 864         if (result)
 865                 goto out_free_levels;
 866
 867         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 868
 869         if (!br->flags._BQC_use_index) {
 870                 /*
 871                  * Set the backlight to the initial state.
 872                  * On some buggy laptops, _BQC returns an uninitialized value
 873                  * when invoked for the first time, i.e. level_old is invalid.
 874                  * set the backlight to max_level in this case
 875                  */
 876                 for (i = 2; i < br->count; i++)
 877                         if (level_old == br->levels[i])
 878                                 level = level_old;
 879                 goto set_level;
 880         }
 881
 882         if (br->flags._BCL_reversed)
 883                 level_old = (br->count - 1) - level_old;
 884         level = br->levels[level_old];
 885
 886 set_level:
 887         result = acpi_video_device_lcd_set_level(device, level);
 888         if (result)
 889                 goto out_free_levels;
 890
 891         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 892                           "found %d brightness levels\n", count - 2));
 893         kfree(obj);
 894         return result;
 895
 896 out_free_levels:
 897         kfree(br->levels);
 898 out_free:
 899         kfree(br);
 900 out:
 901         device->brightness = NULL;
 902         kfree(obj);
 903         return result;
 904 }
 905
 906 /*
 907  *  Arg:
 908  *      device  : video output device (LCD, CRT, ..)
 909  *
 910  *  Return Value:
 911  *      None
 912  *
 913  *  Find out all required AML methods defined under the output
 914  *  device.
 915  */
 916
 917 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 918 {
 919         acpi_handle h_dummy1;
 920
 921         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 922                 device->cap._ADR = 1;
 923         }
 924         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 925                 device->cap._BCL = 1;
 926         }
 927         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 928                 device->cap._BCM = 1;
 929         }
 930         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 931                 device->cap._BQC = 1;
 932         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 933                                 &h_dummy1))) {
 934                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 935                 device->cap._BCQ = 1;
 936         }
 937
 938         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 939                 device->cap._DDC = 1;
 940         }
 941         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 942                 device->cap._DCS = 1;
 943         }
 944         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 945                 device->cap._DGS = 1;
 946         }
 947         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 948                 device->cap._DSS = 1;
 949         }
 950
 951         if (acpi_video_backlight_support()) {
 952                 struct backlight_properties props;
 953                 int result;
 954                 static int count = 0;
 955                 char *name;
 956
 957                 result = acpi_video_init_brightness(device);
 958                 if (result)
 959                         return;
 960                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 961                 if (!name)
 962                         return;
 963                 count++;
 964
 965                 memset(&props, 0, sizeof(struct backlight_properties));
 966                 props.max_brightness = device->brightness->count - 3;
 967                 device->backlight = backlight_device_register(name, NULL, device,
 968                                                               &acpi_backlight_ops,
 969                                                               &props);
 970                 kfree(name);
 971                 if (IS_ERR(device->backlight))
 972                         return;
 973
 974                 /*
 975                  * Save current brightness level in case we have to restore it
 976                  * before acpi_video_device_lcd_set_level() is called next time.
 977                  */
 978                 device->backlight->props.brightness =
 979                                 acpi_video_get_brightness(device->backlight);
 980
 981                 result = sysfs_create_link(&device->backlight->dev.kobj,
 982                                            &device->dev->dev.kobj, "device");
 983                 if (result)
 984                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 985
 986                 device->cooling_dev = thermal_cooling_device_register("LCD",
 987                                         device->dev, &video_cooling_ops);
 988                 if (IS_ERR(device->cooling_dev)) {
 989                         /*
 990                          * Set cooling_dev to NULL so we don't crash trying to
 991                          * free it.
 992                          * Also, why the hell we are returning early and
 993                          * not attempt to register video output if cooling
 994                          * device registration failed?
 995                          * -- dtor
 996                          */
 997                         device->cooling_dev = NULL;
 998                         return;
 999                 }
1000
1001                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1002                          device->cooling_dev->id);
1003                 result = sysfs_create_link(&device->dev->dev.kobj,
1004                                 &device->cooling_dev->device.kobj,
1005                                 "thermal_cooling");
1006                 if (result)
1007                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1008                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1009                                 &device->dev->dev.kobj, "device");
1010                 if (result)
1011                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1012
1013         }
1014
1015         if (acpi_video_display_switch_support()) {
1016
1017                 if (device->cap._DCS && device->cap._DSS) {
1018                         static int count;
1019                         char *name;
1020                         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1021                         if (!name)
1022                                 return;
1023                         count++;
1024                         device->output_dev = video_output_register(name,
1025                                         NULL, device, &acpi_output_properties);
1026                         kfree(name);
1027                 }
1028         }
1029 }
1030
1031 /*
1032  *  Arg:
1033  *      device  : video output device (VGA)
1034  *
1035  *  Return Value:
1036  *      None
1037  *
1038  *  Find out all required AML methods defined under the video bus device.
1039  */
1040
1041 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1042 {
1043         acpi_handle h_dummy1;
1044
1045         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1046                 video->cap._DOS = 1;
1047         }
1048         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1049                 video->cap._DOD = 1;
1050         }
1051         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1052                 video->cap._ROM = 1;
1053         }
1054         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1055                 video->cap._GPD = 1;
1056         }
1057         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1058                 video->cap._SPD = 1;
1059         }
1060         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1061                 video->cap._VPO = 1;
1062         }
1063 }
1064
1065 /*
1066  * Check whether the video bus device has required AML method to
1067  * support the desired features
1068  */
1069
1070 static int acpi_video_bus_check(struct acpi_video_bus *video)
1071 {
1072         acpi_status status = -ENOENT;
1073         struct pci_dev *dev;
1074
1075         if (!video)
1076                 return -EINVAL;
1077
1078         dev = acpi_get_pci_dev(video->device->handle);
1079         if (!dev)
1080                 return -ENODEV;
1081         pci_dev_put(dev);
1082
1083         /* Since there is no HID, CID and so on for VGA driver, we have
1084          * to check well known required nodes.
1085          */
1086
1087         /* Does this device support video switching? */
1088         if (video->cap._DOS || video->cap._DOD) {
1089                 if (!video->cap._DOS) {
1090                         printk(KERN_WARNING FW_BUG
1091                                 "ACPI(%s) defines _DOD but not _DOS\n",
1092                                 acpi_device_bid(video->device));
1093                 }
1094                 video->flags.multihead = 1;
1095                 status = 0;
1096         }
1097
1098         /* Does this device support retrieving a video ROM? */
1099         if (video->cap._ROM) {
1100                 video->flags.rom = 1;
1101                 status = 0;
1102         }
1103
1104         /* Does this device support configuring which video device to POST? */
1105         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1106                 video->flags.post = 1;
1107                 status = 0;
1108         }
1109
1110         return status;
1111 }
1112
1113 /* --------------------------------------------------------------------------
1114                               FS Interface (/proc)
1115    -------------------------------------------------------------------------- */
1116 #ifdef CONFIG_ACPI_PROCFS
1117
1118 static struct proc_dir_entry *acpi_video_dir;
1119
1120 /* video devices */
1121
1122 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1123 {
1124         struct acpi_video_device *dev = seq->private;
1125
1126
1127         if (!dev)
1128                 goto end;
1129
1130         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1131         seq_printf(seq, "type:         ");
1132         if (dev->flags.crt)
1133                 seq_printf(seq, "CRT\n");
1134         else if (dev->flags.lcd)
1135                 seq_printf(seq, "LCD\n");
1136         else if (dev->flags.tvout)
1137                 seq_printf(seq, "TVOUT\n");
1138         else if (dev->flags.dvi)
1139                 seq_printf(seq, "DVI\n");
1140         else
1141                 seq_printf(seq, "UNKNOWN\n");
1142
1143         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1144
1145       end:
1146         return 0;
1147 }
1148
1149 static int
1150 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1151 {
1152         return single_open(file, acpi_video_device_info_seq_show,
1153                            PDE(inode)->data);
1154 }
1155
1156 static int
1157 acpi_video_device_query(struct acpi_video_device *device,
1158                         unsigned long long *state)
1159 {
1160         int status;
1161
1162         status = acpi_evaluate_integer(device->dev->handle, "_DGS",
1163                                        NULL, state);
1164
1165         return status;
1166 }
1167
1168 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1169 {
1170         int status;
1171         struct acpi_video_device *dev = seq->private;
1172         unsigned long long state;
1173
1174
1175         if (!dev)
1176                 goto end;
1177
1178         status = acpi_video_device_get_state(dev, &state);
1179         seq_printf(seq, "state:     ");
1180         if (ACPI_SUCCESS(status))
1181                 seq_printf(seq, "0x%02llx\n", state);
1182         else
1183                 seq_printf(seq, "<not supported>\n");
1184
1185         status = acpi_video_device_query(dev, &state);
1186         seq_printf(seq, "query:     ");
1187         if (ACPI_SUCCESS(status))
1188                 seq_printf(seq, "0x%02llx\n", state);
1189         else
1190                 seq_printf(seq, "<not supported>\n");
1191
1192       end:
1193         return 0;
1194 }
1195
1196 static int
1197 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1198 {
1199         return single_open(file, acpi_video_device_state_seq_show,
1200                            PDE(inode)->data);
1201 }
1202
1203 static ssize_t
1204 acpi_video_device_write_state(struct file *file,
1205                               const char __user * buffer,
1206                               size_t count, loff_t * data)
1207 {
1208         int status;
1209         struct seq_file *m = file->private_data;
1210         struct acpi_video_device *dev = m->private;
1211         char str[12] = { 0 };
1212         u32 state = 0;
1213
1214
1215         if (!dev || count >= sizeof(str))
1216                 return -EINVAL;
1217
1218         if (copy_from_user(str, buffer, count))
1219                 return -EFAULT;
1220
1221         str[count] = 0;
1222         state = simple_strtoul(str, NULL, 0);
1223         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1224
1225         status = acpi_video_device_set_state(dev, state);
1226
1227         if (status)
1228                 return -EFAULT;
1229
1230         return count;
1231 }
1232
1233 static int
1234 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1235 {
1236         struct acpi_video_device *dev = seq->private;
1237         int i;
1238
1239
1240         if (!dev || !dev->brightness) {
1241                 seq_printf(seq, "<not supported>\n");
1242                 return 0;
1243         }
1244
1245         seq_printf(seq, "levels: ");
1246         for (i = 2; i < dev->brightness->count; i++)
1247                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1248         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1249
1250         return 0;
1251 }
1252
1253 static int
1254 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1255 {
1256         return single_open(file, acpi_video_device_brightness_seq_show,
1257                            PDE(inode)->data);
1258 }
1259
1260 static ssize_t
1261 acpi_video_device_write_brightness(struct file *file,
1262                                    const char __user * buffer,
1263                                    size_t count, loff_t * data)
1264 {
1265         struct seq_file *m = file->private_data;
1266         struct acpi_video_device *dev = m->private;
1267         char str[5] = { 0 };
1268         unsigned int level = 0;
1269         int i;
1270
1271
1272         if (!dev || !dev->brightness || count >= sizeof(str))
1273                 return -EINVAL;
1274
1275         if (copy_from_user(str, buffer, count))
1276                 return -EFAULT;
1277
1278         str[count] = 0;
1279         level = simple_strtoul(str, NULL, 0);
1280
1281         if (level > 100)
1282                 return -EFAULT;
1283
1284         /* validate through the list of available levels */
1285         for (i = 2; i < dev->brightness->count; i++)
1286                 if (level == dev->brightness->levels[i]) {
1287                         if (!acpi_video_device_lcd_set_level(dev, level))
1288                                 return count;
1289                         break;
1290                 }
1291
1292         return -EINVAL;
1293 }
1294
1295 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1296 {
1297         struct acpi_video_device *dev = seq->private;
1298         int status;
1299         int i;
1300         union acpi_object *edid = NULL;
1301
1302
1303         if (!dev)
1304                 goto out;
1305
1306         status = acpi_video_device_EDID(dev, &edid, 128);
1307         if (ACPI_FAILURE(status)) {
1308                 status = acpi_video_device_EDID(dev, &edid, 256);
1309         }
1310
1311         if (ACPI_FAILURE(status)) {
1312                 goto out;
1313         }
1314
1315         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1316                 for (i = 0; i < edid->buffer.length; i++)
1317                         seq_putc(seq, edid->buffer.pointer[i]);
1318         }
1319
1320       out:
1321         if (!edid)
1322                 seq_printf(seq, "<not supported>\n");
1323         else
1324                 kfree(edid);
1325
1326         return 0;
1327 }
1328
1329 static int
1330 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1331 {
1332         return single_open(file, acpi_video_device_EDID_seq_show,
1333                            PDE(inode)->data);
1334 }
1335
1336 static int acpi_video_device_add_fs(struct acpi_device *device)
1337 {
1338         struct proc_dir_entry *entry, *device_dir;
1339         struct acpi_video_device *vid_dev;
1340
1341         vid_dev = acpi_driver_data(device);
1342         if (!vid_dev)
1343                 return -ENODEV;
1344
1345         device_dir = proc_mkdir(acpi_device_bid(device),
1346                                 vid_dev->video->dir);
1347         if (!device_dir)
1348                 return -ENOMEM;
1349
1350         /* 'info' [R] */
1351         entry = proc_create_data("info", S_IRUGO, device_dir,
1352                         &acpi_video_device_info_fops, acpi_driver_data(device));
1353         if (!entry)
1354                 goto err_remove_dir;
1355
1356         /* 'state' [R/W] */
1357         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1358                                  device_dir,
1359                                  &acpi_video_device_state_fops,
1360                                  acpi_driver_data(device));
1361         if (!entry)
1362                 goto err_remove_info;
1363
1364         /* 'brightness' [R/W] */
1365         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1366                                  device_dir,
1367                                  &acpi_video_device_brightness_fops,
1368                                  acpi_driver_data(device));
1369         if (!entry)
1370                 goto err_remove_state;
1371
1372         /* 'EDID' [R] */
1373         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1374                                  &acpi_video_device_EDID_fops,
1375                                  acpi_driver_data(device));
1376         if (!entry)
1377                 goto err_remove_brightness;
1378
1379         acpi_device_dir(device) = device_dir;
1380
1381         return 0;
1382
1383  err_remove_brightness:
1384         remove_proc_entry("brightness", device_dir);
1385  err_remove_state:
1386         remove_proc_entry("state", device_dir);
1387  err_remove_info:
1388         remove_proc_entry("info", device_dir);
1389  err_remove_dir:
1390         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1391         return -ENOMEM;
1392 }
1393
1394 static int acpi_video_device_remove_fs(struct acpi_device *device)
1395 {
1396         struct acpi_video_device *vid_dev;
1397         struct proc_dir_entry *device_dir;
1398
1399         vid_dev = acpi_driver_data(device);
1400         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1401                 return -ENODEV;
1402
1403         device_dir = acpi_device_dir(device);
1404         if (device_dir) {
1405                 remove_proc_entry("info", device_dir);
1406                 remove_proc_entry("state", device_dir);
1407                 remove_proc_entry("brightness", device_dir);
1408                 remove_proc_entry("EDID", device_dir);
1409                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1410                 acpi_device_dir(device) = NULL;
1411         }
1412
1413         return 0;
1414 }
1415
1416 /* video bus */
1417 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1418 {
1419         struct acpi_video_bus *video = seq->private;
1420
1421
1422         if (!video)
1423                 goto end;
1424
1425         seq_printf(seq, "Switching heads:              %s\n",
1426                    video->flags.multihead ? "yes" : "no");
1427         seq_printf(seq, "Video ROM:                    %s\n",
1428                    video->flags.rom ? "yes" : "no");
1429         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1430                    video->flags.post ? "yes" : "no");
1431
1432       end:
1433         return 0;
1434 }
1435
1436 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1437 {
1438         return single_open(file, acpi_video_bus_info_seq_show,
1439                            PDE(inode)->data);
1440 }
1441
1442 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1443 {
1444         struct acpi_video_bus *video = seq->private;
1445
1446
1447         if (!video)
1448                 goto end;
1449
1450         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1451         seq_printf(seq, "<TODO>\n");
1452
1453       end:
1454         return 0;
1455 }
1456
1457 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1458 {
1459         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1460 }
1461
1462 static int
1463 acpi_video_bus_POST_options(struct acpi_video_bus *video,
1464                             unsigned long long *options)
1465 {
1466         int status;
1467
1468         status = acpi_evaluate_integer(video->device->handle, "_VPO",
1469                                        NULL, options);
1470         *options &= 3;
1471
1472         return status;
1473 }
1474
1475 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1476 {
1477         struct acpi_video_bus *video = seq->private;
1478         unsigned long long options;
1479         int status;
1480
1481
1482         if (!video)
1483                 goto end;
1484
1485         status = acpi_video_bus_POST_options(video, &options);
1486         if (ACPI_SUCCESS(status)) {
1487                 if (!(options & 1)) {
1488                         printk(KERN_WARNING PREFIX
1489                                "The motherboard VGA device is not listed as a possible POST device.\n");
1490                         printk(KERN_WARNING PREFIX
1491                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1492                 }
1493                 printk(KERN_WARNING "%llx\n", options);
1494                 seq_printf(seq, "can POST: <integrated video>");
1495                 if (options & 2)
1496                         seq_printf(seq, " <PCI video>");
1497                 if (options & 4)
1498                         seq_printf(seq, " <AGP video>");
1499                 seq_putc(seq, '\n');
1500         } else
1501                 seq_printf(seq, "<not supported>\n");
1502       end:
1503         return 0;
1504 }
1505
1506 static int
1507 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1508 {
1509         return single_open(file, acpi_video_bus_POST_info_seq_show,
1510                            PDE(inode)->data);
1511 }
1512
1513 static int
1514 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
1515 {
1516         int status;
1517
1518         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
1519
1520         return status;
1521 }
1522
1523 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1524 {
1525         struct acpi_video_bus *video = seq->private;
1526         int status;
1527         unsigned long long id;
1528
1529
1530         if (!video)
1531                 goto end;
1532
1533         status = acpi_video_bus_get_POST(video, &id);
1534         if (!ACPI_SUCCESS(status)) {
1535                 seq_printf(seq, "<not supported>\n");
1536                 goto end;
1537         }
1538         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1539
1540       end:
1541         return 0;
1542 }
1543
1544 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1545 {
1546         struct acpi_video_bus *video = seq->private;
1547
1548
1549         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1550
1551         return 0;
1552 }
1553
1554 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1555 {
1556         return single_open(file, acpi_video_bus_POST_seq_show,
1557                            PDE(inode)->data);
1558 }
1559
1560 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1561 {
1562         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1563 }
1564
1565 static int
1566 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
1567 {
1568         int status;
1569         unsigned long long tmp;
1570         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
1571         struct acpi_object_list args = { 1, &arg0 };
1572
1573
1574         arg0.integer.value = option;
1575
1576         status = acpi_evaluate_integer(video->device->handle, "_SPD",
1577                                        &args, &tmp);
1578         if (ACPI_SUCCESS(status))
1579                 status = tmp ? (-EINVAL) : (AE_OK);
1580
1581         return status;
1582 }
1583
1584 static ssize_t
1585 acpi_video_bus_write_POST(struct file *file,
1586                           const char __user * buffer,
1587                           size_t count, loff_t * data)
1588 {
1589         int status;
1590         struct seq_file *m = file->private_data;
1591         struct acpi_video_bus *video = m->private;
1592         char str[12] = { 0 };
1593         unsigned long long opt, options;
1594
1595
1596         if (!video || count >= sizeof(str))
1597                 return -EINVAL;
1598
1599         status = acpi_video_bus_POST_options(video, &options);
1600         if (!ACPI_SUCCESS(status))
1601                 return -EINVAL;
1602
1603         if (copy_from_user(str, buffer, count))
1604                 return -EFAULT;
1605
1606         str[count] = 0;
1607         opt = strtoul(str, NULL, 0);
1608         if (opt > 3)
1609                 return -EFAULT;
1610
1611         /* just in case an OEM 'forgot' the motherboard... */
1612         options |= 1;
1613
1614         if (options & (1ul << opt)) {
1615                 status = acpi_video_bus_set_POST(video, opt);
1616                 if (!ACPI_SUCCESS(status))
1617                         return -EFAULT;
1618
1619         }
1620
1621         return count;
1622 }
1623
1624 static ssize_t
1625 acpi_video_bus_write_DOS(struct file *file,
1626                          const char __user * buffer,
1627                          size_t count, loff_t * data)
1628 {
1629         int status;
1630         struct seq_file *m = file->private_data;
1631         struct acpi_video_bus *video = m->private;
1632         char str[12] = { 0 };
1633         unsigned long opt;
1634
1635
1636         if (!video || count >= sizeof(str))
1637                 return -EINVAL;
1638
1639         if (copy_from_user(str, buffer, count))
1640                 return -EFAULT;
1641
1642         str[count] = 0;
1643         opt = strtoul(str, NULL, 0);
1644         if (opt > 7)
1645                 return -EFAULT;
1646
1647         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1648
1649         if (!ACPI_SUCCESS(status))
1650                 return -EFAULT;
1651
1652         return count;
1653 }
1654
1655 static int acpi_video_bus_add_fs(struct acpi_device *device)
1656 {
1657         struct acpi_video_bus *video = acpi_driver_data(device);
1658         struct proc_dir_entry *device_dir;
1659         struct proc_dir_entry *entry;
1660
1661         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1662         if (!device_dir)
1663                 return -ENOMEM;
1664
1665         /* 'info' [R] */
1666         entry = proc_create_data("info", S_IRUGO, device_dir,
1667                                  &acpi_video_bus_info_fops,
1668                                  acpi_driver_data(device));
1669         if (!entry)
1670                 goto err_remove_dir;
1671
1672         /* 'ROM' [R] */
1673         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1674                                  &acpi_video_bus_ROM_fops,
1675                                  acpi_driver_data(device));
1676         if (!entry)
1677                 goto err_remove_info;
1678
1679         /* 'POST_info' [R] */
1680         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1681                                  &acpi_video_bus_POST_info_fops,
1682                                  acpi_driver_data(device));
1683         if (!entry)
1684                 goto err_remove_rom;
1685
1686         /* 'POST' [R/W] */
1687         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1688                                  device_dir,
1689                                  &acpi_video_bus_POST_fops,
1690                                  acpi_driver_data(device));
1691         if (!entry)
1692                 goto err_remove_post_info;
1693
1694         /* 'DOS' [R/W] */
1695         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1696                                  device_dir,
1697                                  &acpi_video_bus_DOS_fops,
1698                                  acpi_driver_data(device));
1699         if (!entry)
1700                 goto err_remove_post;
1701
1702         video->dir = acpi_device_dir(device) = device_dir;
1703         return 0;
1704
1705  err_remove_post:
1706         remove_proc_entry("POST", device_dir);
1707  err_remove_post_info:
1708         remove_proc_entry("POST_info", device_dir);
1709  err_remove_rom:
1710         remove_proc_entry("ROM", device_dir);
1711  err_remove_info:
1712         remove_proc_entry("info", device_dir);
1713  err_remove_dir:
1714         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1715         return -ENOMEM;
1716 }
1717
1718 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1719 {
1720         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1721
1722         if (device_dir) {
1723                 remove_proc_entry("info", device_dir);
1724                 remove_proc_entry("ROM", device_dir);
1725                 remove_proc_entry("POST_info", device_dir);
1726                 remove_proc_entry("POST", device_dir);
1727                 remove_proc_entry("DOS", device_dir);
1728                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1729                 acpi_device_dir(device) = NULL;
1730         }
1731
1732         return 0;
1733 }
1734 #else
1735 static inline int acpi_video_device_add_fs(struct acpi_device *device)
1736 {
1737         return 0;
1738 }
1739 static inline int acpi_video_device_remove_fs(struct acpi_device *device)
1740 {
1741         return 0;
1742 }
1743 static inline int acpi_video_bus_add_fs(struct acpi_device *device)
1744 {
1745         return 0;
1746 }
1747 static inline int acpi_video_bus_remove_fs(struct acpi_device *device)
1748 {
1749         return 0;
1750 }
1751 #endif /* CONFIG_ACPI_PROCFS */
1752
1753 /* --------------------------------------------------------------------------
1754                                  Driver Interface
1755    -------------------------------------------------------------------------- */
1756
1757 /* device interface */
1758 static struct acpi_video_device_attrib*
1759 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1760 {
1761         struct acpi_video_enumerated_device *ids;
1762         int i;
1763
1764         for (i = 0; i < video->attached_count; i++) {
1765                 ids = &video->attached_array[i];
1766                 if ((ids->value.int_val & 0xffff) == device_id)
1767                         return &ids->value.attrib;
1768         }
1769
1770         return NULL;
1771 }
1772
1773 static int
1774 acpi_video_get_device_type(struct acpi_video_bus *video,
1775                            unsigned long device_id)
1776 {
1777         struct acpi_video_enumerated_device *ids;
1778         int i;
1779
1780         for (i = 0; i < video->attached_count; i++) {
1781                 ids = &video->attached_array[i];
1782                 if ((ids->value.int_val & 0xffff) == device_id)
1783                         return ids->value.int_val;
1784         }
1785
1786         return 0;
1787 }
1788
1789 static int
1790 acpi_video_bus_get_one_device(struct acpi_device *device,
1791                               struct acpi_video_bus *video)
1792 {
1793         unsigned long long device_id;
1794         int status, device_type;
1795         struct acpi_video_device *data;
1796         struct acpi_video_device_attrib* attribute;
1797
1798         if (!device || !video)
1799                 return -EINVAL;
1800
1801         status =
1802             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1803         if (ACPI_SUCCESS(status)) {
1804
1805                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1806                 if (!data)
1807                         return -ENOMEM;
1808
1809                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1810                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1811                 device->driver_data = data;
1812
1813                 data->device_id = device_id;
1814                 data->video = video;
1815                 data->dev = device;
1816
1817                 attribute = acpi_video_get_device_attr(video, device_id);
1818
1819                 if((attribute != NULL) && attribute->device_id_scheme) {
1820                         switch (attribute->display_type) {
1821                         case ACPI_VIDEO_DISPLAY_CRT:
1822                                 data->flags.crt = 1;
1823                                 break;
1824                         case ACPI_VIDEO_DISPLAY_TV:
1825                                 data->flags.tvout = 1;
1826                                 break;
1827                         case ACPI_VIDEO_DISPLAY_DVI:
1828                                 data->flags.dvi = 1;
1829                                 break;
1830                         case ACPI_VIDEO_DISPLAY_LCD:
1831                                 data->flags.lcd = 1;
1832                                 break;
1833                         default:
1834                                 data->flags.unknown = 1;
1835                                 break;
1836                         }
1837                         if(attribute->bios_can_detect)
1838                                 data->flags.bios = 1;
1839                 } else {
1840                         /* Check for legacy IDs */
1841                         device_type = acpi_video_get_device_type(video,
1842                                                                  device_id);
1843                         /* Ignore bits 16 and 18-20 */
1844                         switch (device_type & 0xffe2ffff) {
1845                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1846                                 data->flags.crt = 1;
1847                                 break;
1848                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1849                                 data->flags.lcd = 1;
1850                                 break;
1851                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1852                                 data->flags.tvout = 1;
1853                                 break;
1854                         default:
1855                                 data->flags.unknown = 1;
1856                         }
1857                 }
1858
1859                 acpi_video_device_bind(video, data);
1860                 acpi_video_device_find_cap(data);
1861
1862                 status = acpi_install_notify_handler(device->handle,
1863                                                      ACPI_DEVICE_NOTIFY,
1864                                                      acpi_video_device_notify,
1865                                                      data);
1866                 if (ACPI_FAILURE(status)) {
1867                         printk(KERN_ERR PREFIX
1868                                           "Error installing notify handler\n");
1869                         if(data->brightness)
1870                                 kfree(data->brightness->levels);
1871                         kfree(data->brightness);
1872                         kfree(data);
1873                         return -ENODEV;
1874                 }
1875
1876                 mutex_lock(&video->device_list_lock);
1877                 list_add_tail(&data->entry, &video->video_device_list);
1878                 mutex_unlock(&video->device_list_lock);
1879
1880                 acpi_video_device_add_fs(device);
1881
1882                 return 0;
1883         }
1884
1885         return -ENOENT;
1886 }
1887
1888 /*
1889  *  Arg:
1890  *      video   : video bus device
1891  *
1892  *  Return:
1893  *      none
1894  *
1895  *  Enumerate the video device list of the video bus,
1896  *  bind the ids with the corresponding video devices
1897  *  under the video bus.
1898  */
1899
1900 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1901 {
1902         struct acpi_video_device *dev;
1903
1904         mutex_lock(&video->device_list_lock);
1905
1906         list_for_each_entry(dev, &video->video_device_list, entry)
1907                 acpi_video_device_bind(video, dev);
1908
1909         mutex_unlock(&video->device_list_lock);
1910 }
1911
1912 /*
1913  *  Arg:
1914  *      video   : video bus device
1915  *      device  : video output device under the video
1916  *              bus
1917  *
1918  *  Return:
1919  *      none
1920  *
1921  *  Bind the ids with the corresponding video devices
1922  *  under the video bus.
1923  */
1924
1925 static void
1926 acpi_video_device_bind(struct acpi_video_bus *video,
1927                        struct acpi_video_device *device)
1928 {
1929         struct acpi_video_enumerated_device *ids;
1930         int i;
1931
1932         for (i = 0; i < video->attached_count; i++) {
1933                 ids = &video->attached_array[i];
1934                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1935                         ids->bind_info = device;
1936                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1937                 }
1938         }
1939 }
1940
1941 /*
1942  *  Arg:
1943  *      video   : video bus device
1944  *
1945  *  Return:
1946  *      < 0     : error
1947  *
1948  *  Call _DOD to enumerate all devices attached to display adapter
1949  *
1950  */
1951
1952 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1953 {
1954         int status;
1955         int count;
1956         int i;
1957         struct acpi_video_enumerated_device *active_list;
1958         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1959         union acpi_object *dod = NULL;
1960         union acpi_object *obj;
1961
1962         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1963         if (!ACPI_SUCCESS(status)) {
1964                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1965                 return status;
1966         }
1967
1968         dod = buffer.pointer;
1969         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1970                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1971                 status = -EFAULT;
1972                 goto out;
1973         }
1974
1975         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1976                           dod->package.count));
1977
1978         active_list = kcalloc(1 + dod->package.count,
1979                               sizeof(struct acpi_video_enumerated_device),
1980                               GFP_KERNEL);
1981         if (!active_list) {
1982                 status = -ENOMEM;
1983                 goto out;
1984         }
1985
1986         count = 0;
1987         for (i = 0; i < dod->package.count; i++) {
1988                 obj = &dod->package.elements[i];
1989
1990                 if (obj->type != ACPI_TYPE_INTEGER) {
1991                         printk(KERN_ERR PREFIX
1992                                 "Invalid _DOD data in element %d\n", i);
1993                         continue;
1994                 }
1995
1996                 active_list[count].value.int_val = obj->integer.value;
1997                 active_list[count].bind_info = NULL;
1998                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1999                                   (int)obj->integer.value));
2000                 count++;
2001         }
2002
2003         kfree(video->attached_array);
2004
2005         video->attached_array = active_list;
2006         video->attached_count = count;
2007
2008  out:
2009         kfree(buffer.pointer);
2010         return status;
2011 }
2012
2013 static int
2014 acpi_video_get_next_level(struct acpi_video_device *device,
2015                           u32 level_current, u32 event)
2016 {
2017         int min, max, min_above, max_below, i, l, delta = 255;
2018         max = max_below = 0;
2019         min = min_above = 255;
2020         /* Find closest level to level_current */
2021         for (i = 2; i < device->brightness->count; i++) {
2022                 l = device->brightness->levels[i];
2023                 if (abs(l - level_current) < abs(delta)) {
2024                         delta = l - level_current;
2025                         if (!delta)
2026                                 break;
2027                 }
2028         }
2029         /* Ajust level_current to closest available level */
2030         level_current += delta;
2031         for (i = 2; i < device->brightness->count; i++) {
2032                 l = device->brightness->levels[i];
2033                 if (l < min)
2034                         min = l;
2035                 if (l > max)
2036                         max = l;
2037                 if (l < min_above && l > level_current)
2038                         min_above = l;
2039                 if (l > max_below && l < level_current)
2040                         max_below = l;
2041         }
2042
2043         switch (event) {
2044         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
2045                 return (level_current < max) ? min_above : min;
2046         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
2047                 return (level_current < max) ? min_above : max;
2048         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
2049                 return (level_current > min) ? max_below : min;
2050         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
2051         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
2052                 return 0;
2053         default:
2054                 return level_current;
2055         }
2056 }
2057
2058 static int
2059 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2060 {
2061         unsigned long long level_current, level_next;
2062         int result = -EINVAL;
2063
2064         /* no warning message if acpi_backlight=vendor is used */
2065         if (!acpi_video_backlight_support())
2066                 return 0;
2067
2068         if (!device->brightness)
2069                 goto out;
2070
2071         result = acpi_video_device_lcd_get_level_current(device,
2072                                                          &level_current, 0);
2073         if (result)
2074                 goto out;
2075
2076         level_next = acpi_video_get_next_level(device, level_current, event);
2077
2078         result = acpi_video_device_lcd_set_level(device, level_next);
2079
2080         if (!result)
2081                 backlight_force_update(device->backlight,
2082                                        BACKLIGHT_UPDATE_HOTKEY);
2083
2084 out:
2085         if (result)
2086                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2087
2088         return result;
2089 }
2090
2091 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
2092                         void **edid)
2093 {
2094         struct acpi_video_bus *video;
2095         struct acpi_video_device *video_device;
2096         union acpi_object *buffer = NULL;
2097         acpi_status status;
2098         int i, length;
2099
2100         if (!device || !acpi_driver_data(device))
2101                 return -EINVAL;
2102
2103         video = acpi_driver_data(device);
2104
2105         for (i = 0; i < video->attached_count; i++) {
2106                 video_device = video->attached_array[i].bind_info;
2107                 length = 256;
2108
2109                 if (!video_device)
2110                         continue;
2111
2112                 if (type) {
2113                         switch (type) {
2114                         case ACPI_VIDEO_DISPLAY_CRT:
2115                                 if (!video_device->flags.crt)
2116                                         continue;
2117                                 break;
2118                         case ACPI_VIDEO_DISPLAY_TV:
2119                                 if (!video_device->flags.tvout)
2120                                         continue;
2121                                 break;
2122                         case ACPI_VIDEO_DISPLAY_DVI:
2123                                 if (!video_device->flags.dvi)
2124                                         continue;
2125                                 break;
2126                         case ACPI_VIDEO_DISPLAY_LCD:
2127                                 if (!video_device->flags.lcd)
2128                                         continue;
2129                                 break;
2130                         }
2131                 } else if (video_device->device_id != device_id) {
2132                         continue;
2133                 }
2134
2135                 status = acpi_video_device_EDID(video_device, &buffer, length);
2136
2137                 if (ACPI_FAILURE(status) || !buffer ||
2138                     buffer->type != ACPI_TYPE_BUFFER) {
2139                         length = 128;
2140                         status = acpi_video_device_EDID(video_device, &buffer,
2141                                                         length);
2142                         if (ACPI_FAILURE(status) || !buffer ||
2143                             buffer->type != ACPI_TYPE_BUFFER) {
2144                                 continue;
2145                         }
2146                 }
2147
2148                 *edid = buffer->buffer.pointer;
2149                 return length;
2150         }
2151
2152         return -ENODEV;
2153 }
2154 EXPORT_SYMBOL(acpi_video_get_edid);
2155
2156 static int
2157 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2158                            struct acpi_device *device)
2159 {
2160         int status = 0;
2161         struct acpi_device *dev;
2162
2163         acpi_video_device_enumerate(video);
2164
2165         list_for_each_entry(dev, &device->children, node) {
2166
2167                 status = acpi_video_bus_get_one_device(dev, video);
2168                 if (ACPI_FAILURE(status)) {
2169                         printk(KERN_WARNING PREFIX
2170                                         "Cant attach device\n");
2171                         continue;
2172                 }
2173         }
2174         return status;
2175 }
2176
2177 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2178 {
2179         acpi_status status;
2180
2181         if (!device || !device->video)
2182                 return -ENOENT;
2183
2184         acpi_video_device_remove_fs(device->dev);
2185
2186         status = acpi_remove_notify_handler(device->dev->handle,
2187                                             ACPI_DEVICE_NOTIFY,
2188                                             acpi_video_device_notify);
2189         if (ACPI_FAILURE(status)) {
2190                 printk(KERN_WARNING PREFIX
2191                        "Cant remove video notify handler\n");
2192         }
2193         if (device->backlight) {
2194                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2195                 backlight_device_unregister(device->backlight);
2196                 device->backlight = NULL;
2197         }
2198         if (device->cooling_dev) {
2199                 sysfs_remove_link(&device->dev->dev.kobj,
2200                                   "thermal_cooling");
2201                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2202                                   "device");
2203                 thermal_cooling_device_unregister(device->cooling_dev);
2204                 device->cooling_dev = NULL;
2205         }
2206         video_output_unregister(device->output_dev);
2207
2208         return 0;
2209 }
2210
2211 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2212 {
2213         int status;
2214         struct acpi_video_device *dev, *next;
2215
2216         mutex_lock(&video->device_list_lock);
2217
2218         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2219
2220                 status = acpi_video_bus_put_one_device(dev);
2221                 if (ACPI_FAILURE(status))
2222                         printk(KERN_WARNING PREFIX
2223                                "hhuuhhuu bug in acpi video driver.\n");
2224
2225                 if (dev->brightness) {
2226                         kfree(dev->brightness->levels);
2227                         kfree(dev->brightness);
2228                 }
2229                 list_del(&dev->entry);
2230                 kfree(dev);
2231         }
2232
2233         mutex_unlock(&video->device_list_lock);
2234
2235         return 0;
2236 }
2237
2238 /* acpi_video interface */
2239
2240 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2241 {
2242         return acpi_video_bus_DOS(video, 0, 0);
2243 }
2244
2245 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2246 {
2247         return acpi_video_bus_DOS(video, 0, 1);
2248 }
2249
2250 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2251 {
2252         struct acpi_video_bus *video = acpi_driver_data(device);
2253         struct input_dev *input;
2254         int keycode = 0;
2255
2256         if (!video)
2257                 return;
2258
2259         input = video->input;
2260
2261         switch (event) {
2262         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2263                                          * most likely via hotkey. */
2264                 acpi_bus_generate_proc_event(device, event, 0);
2265                 keycode = KEY_SWITCHVIDEOMODE;
2266                 break;
2267
2268         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2269                                          * connector. */
2270                 acpi_video_device_enumerate(video);
2271                 acpi_video_device_rebind(video);
2272                 acpi_bus_generate_proc_event(device, event, 0);
2273                 keycode = KEY_SWITCHVIDEOMODE;
2274                 break;
2275
2276         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2277                 acpi_bus_generate_proc_event(device, event, 0);
2278                 keycode = KEY_SWITCHVIDEOMODE;
2279                 break;
2280         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2281                 acpi_bus_generate_proc_event(device, event, 0);
2282                 keycode = KEY_VIDEO_NEXT;
2283                 break;
2284         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2285                 acpi_bus_generate_proc_event(device, event, 0);
2286                 keycode = KEY_VIDEO_PREV;
2287                 break;
2288
2289         default:
2290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2291                                   "Unsupported event [0x%x]\n", event));
2292                 break;
2293         }
2294
2295         acpi_notifier_call_chain(device, event, 0);
2296
2297         if (keycode) {
2298                 input_report_key(input, keycode, 1);
2299                 input_sync(input);
2300                 input_report_key(input, keycode, 0);
2301                 input_sync(input);
2302         }
2303
2304         return;
2305 }
2306
2307 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2308 {
2309         struct acpi_video_device *video_device = data;
2310         struct acpi_device *device = NULL;
2311         struct acpi_video_bus *bus;
2312         struct input_dev *input;
2313         int keycode = 0;
2314
2315         if (!video_device)
2316                 return;
2317
2318         device = video_device->dev;
2319         bus = video_device->video;
2320         input = bus->input;
2321
2322         switch (event) {
2323         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2324                 if (brightness_switch_enabled)
2325                         acpi_video_switch_brightness(video_device, event);
2326                 acpi_bus_generate_proc_event(device, event, 0);
2327                 keycode = KEY_BRIGHTNESS_CYCLE;
2328                 break;
2329         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2330                 if (brightness_switch_enabled)
2331                         acpi_video_switch_brightness(video_device, event);
2332                 acpi_bus_generate_proc_event(device, event, 0);
2333                 keycode = KEY_BRIGHTNESSUP;
2334                 break;
2335         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2336                 if (brightness_switch_enabled)
2337                         acpi_video_switch_brightness(video_device, event);
2338                 acpi_bus_generate_proc_event(device, event, 0);
2339                 keycode = KEY_BRIGHTNESSDOWN;
2340                 break;
2341         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2342                 if (brightness_switch_enabled)
2343                         acpi_video_switch_brightness(video_device, event);
2344                 acpi_bus_generate_proc_event(device, event, 0);
2345                 keycode = KEY_BRIGHTNESS_ZERO;
2346                 break;
2347         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2348                 if (brightness_switch_enabled)
2349                         acpi_video_switch_brightness(video_device, event);
2350                 acpi_bus_generate_proc_event(device, event, 0);
2351                 keycode = KEY_DISPLAY_OFF;
2352                 break;
2353         default:
2354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2355                                   "Unsupported event [0x%x]\n", event));
2356                 break;
2357         }
2358
2359         acpi_notifier_call_chain(device, event, 0);
2360
2361         if (keycode) {
2362                 input_report_key(input, keycode, 1);
2363                 input_sync(input);
2364                 input_report_key(input, keycode, 0);
2365                 input_sync(input);
2366         }
2367
2368         return;
2369 }
2370
2371 static int acpi_video_resume(struct notifier_block *nb,
2372                                 unsigned long val, void *ign)
2373 {
2374         struct acpi_video_bus *video;
2375         struct acpi_video_device *video_device;
2376         int i;
2377
2378         switch (val) {
2379         case PM_HIBERNATION_PREPARE:
2380         case PM_SUSPEND_PREPARE:
2381         case PM_RESTORE_PREPARE:
2382                 return NOTIFY_DONE;
2383         }
2384
2385         video = container_of(nb, struct acpi_video_bus, pm_nb);
2386
2387         dev_info(&video->device->dev, "Restoring backlight state\n");
2388
2389         for (i = 0; i < video->attached_count; i++) {
2390                 video_device = video->attached_array[i].bind_info;
2391                 if (video_device && video_device->backlight)
2392                         acpi_video_set_brightness(video_device->backlight);
2393         }
2394
2395         return NOTIFY_OK;
2396 }
2397
2398 static acpi_status
2399 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2400                         void **return_value)
2401 {
2402         struct acpi_device *device = context;
2403         struct acpi_device *sibling;
2404         int result;
2405
2406         if (handle == device->handle)
2407                 return AE_CTRL_TERMINATE;
2408
2409         result = acpi_bus_get_device(handle, &sibling);
2410         if (result)
2411                 return AE_OK;
2412
2413         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2414                         return AE_ALREADY_EXISTS;
2415
2416         return AE_OK;
2417 }
2418
2419 static int instance;
2420
2421 static int acpi_video_bus_add(struct acpi_device *device)
2422 {
2423         struct acpi_video_bus *video;
2424         struct input_dev *input;
2425         int error;
2426         acpi_status status;
2427
2428         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2429                                 device->parent->handle, 1,
2430                                 acpi_video_bus_match, NULL,
2431                                 device, NULL);
2432         if (status == AE_ALREADY_EXISTS) {
2433                 printk(KERN_WARNING FW_BUG
2434                         "Duplicate ACPI video bus devices for the"
2435                         " same VGA controller, please try module "
2436                         "parameter \"video.allow_duplicates=1\""
2437                         "if the current driver doesn't work.\n");
2438                 if (!allow_duplicates)
2439                         return -ENODEV;
2440         }
2441
2442         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2443         if (!video)
2444                 return -ENOMEM;
2445
2446         /* a hack to fix the duplicate name "VID" problem on T61 */
2447         if (!strcmp(device->pnp.bus_id, "VID")) {
2448                 if (instance)
2449                         device->pnp.bus_id[3] = '0' + instance;
2450                 instance ++;
2451         }
2452         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2453         if (!strcmp(device->pnp.bus_id, "VGA")) {
2454                 if (instance)
2455                         device->pnp.bus_id[3] = '0' + instance;
2456                 instance++;
2457         }
2458
2459         video->device = device;
2460         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2461         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2462         device->driver_data = video;
2463
2464         acpi_video_bus_find_cap(video);
2465         error = acpi_video_bus_check(video);
2466         if (error)
2467                 goto err_free_video;
2468
2469         error = acpi_video_bus_add_fs(device);
2470         if (error)
2471                 goto err_free_video;
2472
2473         mutex_init(&video->device_list_lock);
2474         INIT_LIST_HEAD(&video->video_device_list);
2475
2476         acpi_video_bus_get_devices(video, device);
2477         acpi_video_bus_start_devices(video);
2478
2479         video->input = input = input_allocate_device();
2480         if (!input) {
2481                 error = -ENOMEM;
2482                 goto err_stop_video;
2483         }
2484
2485         snprintf(video->phys, sizeof(video->phys),
2486                 "%s/video/input0", acpi_device_hid(video->device));
2487
2488         input->name = acpi_device_name(video->device);
2489         input->phys = video->phys;
2490         input->id.bustype = BUS_HOST;
2491         input->id.product = 0x06;
2492         input->dev.parent = &device->dev;
2493         input->evbit[0] = BIT(EV_KEY);
2494         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2495         set_bit(KEY_VIDEO_NEXT, input->keybit);
2496         set_bit(KEY_VIDEO_PREV, input->keybit);
2497         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2498         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2499         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2500         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2501         set_bit(KEY_DISPLAY_OFF, input->keybit);
2502
2503         error = input_register_device(input);
2504         if (error)
2505                 goto err_free_input_dev;
2506
2507         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2508                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2509                video->flags.multihead ? "yes" : "no",
2510                video->flags.rom ? "yes" : "no",
2511                video->flags.post ? "yes" : "no");
2512
2513         video->pm_nb.notifier_call = acpi_video_resume;
2514         video->pm_nb.priority = 0;
2515         register_pm_notifier(&video->pm_nb);
2516
2517         return 0;
2518
2519  err_free_input_dev:
2520         input_free_device(input);
2521  err_stop_video:
2522         acpi_video_bus_stop_devices(video);
2523         acpi_video_bus_put_devices(video);
2524         kfree(video->attached_array);
2525         acpi_video_bus_remove_fs(device);
2526  err_free_video:
2527         kfree(video);
2528         device->driver_data = NULL;
2529
2530         return error;
2531 }
2532
2533 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2534 {
2535         struct acpi_video_bus *video = NULL;
2536
2537
2538         if (!device || !acpi_driver_data(device))
2539                 return -EINVAL;
2540
2541         video = acpi_driver_data(device);
2542
2543         unregister_pm_notifier(&video->pm_nb);
2544
2545         acpi_video_bus_stop_devices(video);
2546         acpi_video_bus_put_devices(video);
2547         acpi_video_bus_remove_fs(device);
2548
2549         input_unregister_device(video->input);
2550         kfree(video->attached_array);
2551         kfree(video);
2552
2553         return 0;
2554 }
2555
2556 static int __init intel_opregion_present(void)
2557 {
2558 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2559         struct pci_dev *dev = NULL;
2560         u32 address;
2561
2562         for_each_pci_dev(dev) {
2563                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2564                         continue;
2565                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2566                         continue;
2567                 pci_read_config_dword(dev, 0xfc, &address);
2568                 if (!address)
2569                         continue;
2570                 return 1;
2571         }
2572 #endif
2573         return 0;
2574 }
2575
2576 int acpi_video_register(void)
2577 {
2578         int result = 0;
2579         if (register_count) {
2580                 /*
2581                  * if the function of acpi_video_register is already called,
2582                  * don't register the acpi_vide_bus again and return no error.
2583                  */
2584                 return 0;
2585         }
2586
2587 #ifdef CONFIG_ACPI_PROCFS
2588         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2589         if (!acpi_video_dir)
2590                 return -ENODEV;
2591 #endif
2592
2593         result = acpi_bus_register_driver(&acpi_video_bus);
2594         if (result < 0) {
2595                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2596                 return -ENODEV;
2597         }
2598
2599         /*
2600          * When the acpi_video_bus is loaded successfully, increase
2601          * the counter reference.
2602          */
2603         register_count = 1;
2604
2605         return 0;
2606 }
2607 EXPORT_SYMBOL(acpi_video_register);
2608
2609 void acpi_video_unregister(void)
2610 {
2611         if (!register_count) {
2612                 /*
2613                  * If the acpi video bus is already unloaded, don't
2614                  * unload it again and return directly.
2615                  */
2616                 return;
2617         }
2618         acpi_bus_unregister_driver(&acpi_video_bus);
2619
2620 #ifdef CONFIG_ACPI_PROCFS
2621         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2622 #endif
2623
2624         register_count = 0;
2625
2626         return;
2627 }
2628 EXPORT_SYMBOL(acpi_video_unregister);
2629
2630 /*
2631  * This is kind of nasty. Hardware using Intel chipsets may require
2632  * the video opregion code to be run first in order to initialise
2633  * state before any ACPI video calls are made. To handle this we defer
2634  * registration of the video class until the opregion code has run.
2635  */
2636
2637 static int __init acpi_video_init(void)
2638 {
2639         dmi_check_system(video_dmi_table);
2640
2641         if (intel_opregion_present())
2642                 return 0;
2643
2644         return acpi_video_register();
2645 }
2646
2647 static void __exit acpi_video_exit(void)
2648 {
2649         acpi_video_unregister();
2650
2651         return;
2652 }
2653
2654 module_init(acpi_video_init);
2655 module_exit(acpi_video_exit);