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
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_VIDEO_CLASS                "video"
  52 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  53 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  54 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  55 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  56 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  57 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  58 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  59
  60 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  61 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  62 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  63 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  64 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  65
  66 #define MAX_NAME_LEN    20
  67
  68 #define ACPI_VIDEO_DISPLAY_CRT  1
  69 #define ACPI_VIDEO_DISPLAY_TV   2
  70 #define ACPI_VIDEO_DISPLAY_DVI  3
  71 #define ACPI_VIDEO_DISPLAY_LCD  4
  72
  73 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  74 ACPI_MODULE_NAME("video");
  75
  76 MODULE_AUTHOR("Bruno Ducrot");
  77 MODULE_DESCRIPTION("ACPI Video Driver");
  78 MODULE_LICENSE("GPL");
  79
  80 static int brightness_switch_enabled = 1;
  81 module_param(brightness_switch_enabled, bool, 0644);
  82
  83 /*
  84  * By default, we don't allow duplicate ACPI video bus devices
  85  * under the same VGA controller
  86  */
  87 static int allow_duplicates;
  88 module_param(allow_duplicates, bool, 0644);
  89
  90 static int register_count = 0;
  91 static int acpi_video_bus_add(struct acpi_device *device);
  92 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  94
  95 static const struct acpi_device_id video_device_ids[] = {
  96         {ACPI_VIDEO_HID, 0},
  97         {"", 0},
  98 };
  99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 100
 101 static struct acpi_driver acpi_video_bus = {
 102         .name = "video",
 103         .class = ACPI_VIDEO_CLASS,
 104         .ids = video_device_ids,
 105         .ops = {
 106                 .add = acpi_video_bus_add,
 107                 .remove = acpi_video_bus_remove,
 108                 .notify = acpi_video_bus_notify,
 109                 },
 110 };
 111
 112 struct acpi_video_bus_flags {
 113         u8 multihead:1;         /* can switch video heads */
 114         u8 rom:1;               /* can retrieve a video rom */
 115         u8 post:1;              /* can configure the head to */
 116         u8 reserved:5;
 117 };
 118
 119 struct acpi_video_bus_cap {
 120         u8 _DOS:1;              /*Enable/Disable output switching */
 121         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 122         u8 _ROM:1;              /*Get ROM Data */
 123         u8 _GPD:1;              /*Get POST Device */
 124         u8 _SPD:1;              /*Set POST Device */
 125         u8 _VPO:1;              /*Video POST Options */
 126         u8 reserved:2;
 127 };
 128
 129 struct acpi_video_device_attrib {
 130         u32 display_index:4;    /* A zero-based instance of the Display */
 131         u32 display_port_attachment:4;  /*This field differentiates the display type */
 132         u32 display_type:4;     /*Describe the specific type in use */
 133         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 134         u32 bios_can_detect:1;  /*BIOS can detect the device */
 135         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 136                                    the VGA device. */
 137         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 138         u32 reserved:10;        /*Must be 0 */
 139         u32 device_id_scheme:1; /*Device ID Scheme */
 140 };
 141
 142 struct acpi_video_enumerated_device {
 143         union {
 144                 u32 int_val;
 145                 struct acpi_video_device_attrib attrib;
 146         } value;
 147         struct acpi_video_device *bind_info;
 148 };
 149
 150 struct acpi_video_bus {
 151         struct acpi_device *device;
 152         u8 dos_setting;
 153         struct acpi_video_enumerated_device *attached_array;
 154         u8 attached_count;
 155         struct acpi_video_bus_cap cap;
 156         struct acpi_video_bus_flags flags;
 157         struct list_head video_device_list;
 158         struct mutex device_list_lock;  /* protects video_device_list */
 159         struct proc_dir_entry *dir;
 160         struct input_dev *input;
 161         char phys[32];  /* for input device */
 162         struct notifier_block pm_nb;
 163 };
 164
 165 struct acpi_video_device_flags {
 166         u8 crt:1;
 167         u8 lcd:1;
 168         u8 tvout:1;
 169         u8 dvi:1;
 170         u8 bios:1;
 171         u8 unknown:1;
 172         u8 reserved:2;
 173 };
 174
 175 struct acpi_video_device_cap {
 176         u8 _ADR:1;              /*Return the unique ID */
 177         u8 _BCL:1;              /*Query list of brightness control levels supported */
 178         u8 _BCM:1;              /*Set the brightness level */
 179         u8 _BQC:1;              /* Get current brightness level */
 180         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 181         u8 _DDC:1;              /*Return the EDID for this device */
 182         u8 _DCS:1;              /*Return status of output device */
 183         u8 _DGS:1;              /*Query graphics state */
 184         u8 _DSS:1;              /*Device state set */
 185 };
 186
 187 struct acpi_video_brightness_flags {
 188         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 189         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 190         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 191         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 192         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 193 };
 194
 195 struct acpi_video_device_brightness {
 196         int curr;
 197         int count;
 198         int *levels;
 199         struct acpi_video_brightness_flags flags;
 200 };
 201
 202 struct acpi_video_device {
 203         unsigned long device_id;
 204         struct acpi_video_device_flags flags;
 205         struct acpi_video_device_cap cap;
 206         struct list_head entry;
 207         struct acpi_video_bus *video;
 208         struct acpi_device *dev;
 209         struct acpi_video_device_brightness *brightness;
 210         struct backlight_device *backlight;
 211         struct thermal_cooling_device *cooling_dev;
 212         struct output_device *output_dev;
 213 };
 214
 215 /* bus */
 216 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 217 static const struct file_operations acpi_video_bus_info_fops = {
 218         .owner = THIS_MODULE,
 219         .open = acpi_video_bus_info_open_fs,
 220         .read = seq_read,
 221         .llseek = seq_lseek,
 222         .release = single_release,
 223 };
 224
 225 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 226 static const struct file_operations acpi_video_bus_ROM_fops = {
 227         .owner = THIS_MODULE,
 228         .open = acpi_video_bus_ROM_open_fs,
 229         .read = seq_read,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 235                                             struct file *file);
 236 static const struct file_operations acpi_video_bus_POST_info_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_video_bus_POST_info_open_fs,
 239         .read = seq_read,
 240         .llseek = seq_lseek,
 241         .release = single_release,
 242 };
 243
 244 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 245 static ssize_t acpi_video_bus_write_POST(struct file *file,
 246         const char __user *buffer, size_t count, loff_t *data);
 247 static const struct file_operations acpi_video_bus_POST_fops = {
 248         .owner = THIS_MODULE,
 249         .open = acpi_video_bus_POST_open_fs,
 250         .read = seq_read,
 251         .write = acpi_video_bus_write_POST,
 252         .llseek = seq_lseek,
 253         .release = single_release,
 254 };
 255
 256 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 257 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 258         const char __user *buffer, size_t count, loff_t *data);
 259 static const struct file_operations acpi_video_bus_DOS_fops = {
 260         .owner = THIS_MODULE,
 261         .open = acpi_video_bus_DOS_open_fs,
 262         .read = seq_read,
 263         .write = acpi_video_bus_write_DOS,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 /* device */
 269 static int acpi_video_device_info_open_fs(struct inode *inode,
 270                                           struct file *file);
 271 static const struct file_operations acpi_video_device_info_fops = {
 272         .owner = THIS_MODULE,
 273         .open = acpi_video_device_info_open_fs,
 274         .read = seq_read,
 275         .llseek = seq_lseek,
 276         .release = single_release,
 277 };
 278
 279 static int acpi_video_device_state_open_fs(struct inode *inode,
 280                                            struct file *file);
 281 static ssize_t acpi_video_device_write_state(struct file *file,
 282         const char __user *buffer, size_t count, loff_t *data);
 283 static const struct file_operations acpi_video_device_state_fops = {
 284         .owner = THIS_MODULE,
 285         .open = acpi_video_device_state_open_fs,
 286         .read = seq_read,
 287         .write = acpi_video_device_write_state,
 288         .llseek = seq_lseek,
 289         .release = single_release,
 290 };
 291
 292 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 293                                                 struct file *file);
 294 static ssize_t acpi_video_device_write_brightness(struct file *file,
 295         const char __user *buffer, size_t count, loff_t *data);
 296 static const struct file_operations acpi_video_device_brightness_fops = {
 297         .owner = THIS_MODULE,
 298         .open = acpi_video_device_brightness_open_fs,
 299         .read = seq_read,
 300         .write = acpi_video_device_write_brightness,
 301         .llseek = seq_lseek,
 302         .release = single_release,
 303 };
 304
 305 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 306                                           struct file *file);
 307 static const struct file_operations acpi_video_device_EDID_fops = {
 308         .owner = THIS_MODULE,
 309         .open = acpi_video_device_EDID_open_fs,
 310         .read = seq_read,
 311         .llseek = seq_lseek,
 312         .release = single_release,
 313 };
 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_query(struct acpi_video_device *device, unsigned long long *state)
 458 {
 459         int status;
 460
 461         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 462
 463         return status;
 464 }
 465
 466 static int
 467 acpi_video_device_get_state(struct acpi_video_device *device,
 468                             unsigned long long *state)
 469 {
 470         int status;
 471
 472         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 473
 474         return status;
 475 }
 476
 477 static int
 478 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 479 {
 480         int status;
 481         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 482         struct acpi_object_list args = { 1, &arg0 };
 483         unsigned long long ret;
 484
 485
 486         arg0.integer.value = state;
 487         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 488
 489         return status;
 490 }
 491
 492 static int
 493 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 494                                    union acpi_object **levels)
 495 {
 496         int status;
 497         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 498         union acpi_object *obj;
 499
 500
 501         *levels = NULL;
 502
 503         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 504         if (!ACPI_SUCCESS(status))
 505                 return status;
 506         obj = (union acpi_object *)buffer.pointer;
 507         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 508                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 509                 status = -EFAULT;
 510                 goto err;
 511         }
 512
 513         *levels = obj;
 514
 515         return 0;
 516
 517       err:
 518         kfree(buffer.pointer);
 519
 520         return status;
 521 }
 522
 523 static int
 524 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 525 {
 526         int status;
 527         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 528         struct acpi_object_list args = { 1, &arg0 };
 529         int state;
 530
 531         arg0.integer.value = level;
 532
 533         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 534                                       &args, NULL);
 535         if (ACPI_FAILURE(status)) {
 536                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 537                 return -EIO;
 538         }
 539
 540         device->brightness->curr = level;
 541         for (state = 2; state < device->brightness->count; state++)
 542                 if (level == device->brightness->levels[state]) {
 543                         if (device->backlight)
 544                                 device->backlight->props.brightness = state - 2;
 545                         return 0;
 546                 }
 547
 548         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 549         return -EINVAL;
 550 }
 551
 552 /*
 553  * For some buggy _BQC methods, we need to add a constant value to
 554  * the _BQC return value to get the actual current brightness level
 555  */
 556
 557 static int bqc_offset_aml_bug_workaround;
 558 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 559 {
 560         bqc_offset_aml_bug_workaround = 9;
 561         return 0;
 562 }
 563
 564 static struct dmi_system_id video_dmi_table[] __initdata = {
 565         /*
 566          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 567          */
 568         {
 569          .callback = video_set_bqc_offset,
 570          .ident = "Acer Aspire 5720",
 571          .matches = {
 572                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 573                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 574                 },
 575         },
 576         {
 577          .callback = video_set_bqc_offset,
 578          .ident = "Acer Aspire 5710Z",
 579          .matches = {
 580                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 582                 },
 583         },
 584         {
 585          .callback = video_set_bqc_offset,
 586          .ident = "eMachines E510",
 587          .matches = {
 588                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 589                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 590                 },
 591         },
 592         {
 593          .callback = video_set_bqc_offset,
 594          .ident = "Acer Aspire 5315",
 595          .matches = {
 596                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 597                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 598                 },
 599         },
 600         {
 601          .callback = video_set_bqc_offset,
 602          .ident = "Acer Aspire 7720",
 603          .matches = {
 604                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 605                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 606                 },
 607         },
 608         {}
 609 };
 610
 611 static int
 612 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 613                                         unsigned long long *level, int init)
 614 {
 615         acpi_status status = AE_OK;
 616         int i;
 617
 618         if (device->cap._BQC || device->cap._BCQ) {
 619                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 620
 621                 status = acpi_evaluate_integer(device->dev->handle, buf,
 622                                                 NULL, level);
 623                 if (ACPI_SUCCESS(status)) {
 624                         if (device->brightness->flags._BQC_use_index) {
 625                                 if (device->brightness->flags._BCL_reversed)
 626                                         *level = device->brightness->count
 627                                                                  - 3 - (*level);
 628                                 *level = device->brightness->levels[*level + 2];
 629
 630                         }
 631                         *level += bqc_offset_aml_bug_workaround;
 632                         for (i = 2; i < device->brightness->count; i++)
 633                                 if (device->brightness->levels[i] == *level) {
 634                                         device->brightness->curr = *level;
 635                                         return 0;
 636                         }
 637                         if (!init) {
 638                                 /*
 639                                  * BQC returned an invalid level.
 640                                  * Stop using it.
 641                                  */
 642                                 ACPI_WARNING((AE_INFO,
 643                                               "%s returned an invalid level",
 644                                               buf));
 645                                 device->cap._BQC = device->cap._BCQ = 0;
 646                         }
 647                 } else {
 648                         /* Fixme:
 649                          * should we return an error or ignore this failure?
 650                          * dev->brightness->curr is a cached value which stores
 651                          * the correct current backlight level in most cases.
 652                          * ACPI video backlight still works w/ buggy _BQC.
 653                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 654                          */
 655                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 656                         device->cap._BQC = device->cap._BCQ = 0;
 657                 }
 658         }
 659
 660         *level = device->brightness->curr;
 661         return 0;
 662 }
 663
 664 static int
 665 acpi_video_device_EDID(struct acpi_video_device *device,
 666                        union acpi_object **edid, ssize_t length)
 667 {
 668         int status;
 669         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 670         union acpi_object *obj;
 671         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 672         struct acpi_object_list args = { 1, &arg0 };
 673
 674
 675         *edid = NULL;
 676
 677         if (!device)
 678                 return -ENODEV;
 679         if (length == 128)
 680                 arg0.integer.value = 1;
 681         else if (length == 256)
 682                 arg0.integer.value = 2;
 683         else
 684                 return -EINVAL;
 685
 686         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 687         if (ACPI_FAILURE(status))
 688                 return -ENODEV;
 689
 690         obj = buffer.pointer;
 691
 692         if (obj && obj->type == ACPI_TYPE_BUFFER)
 693                 *edid = obj;
 694         else {
 695                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 696                 status = -EFAULT;
 697                 kfree(obj);
 698         }
 699
 700         return status;
 701 }
 702
 703 /* bus */
 704
 705 static int
 706 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 707 {
 708         int status;
 709         unsigned long long tmp;
 710         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 711         struct acpi_object_list args = { 1, &arg0 };
 712
 713
 714         arg0.integer.value = option;
 715
 716         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 717         if (ACPI_SUCCESS(status))
 718                 status = tmp ? (-EINVAL) : (AE_OK);
 719
 720         return status;
 721 }
 722
 723 static int
 724 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 725 {
 726         int status;
 727
 728         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 729
 730         return status;
 731 }
 732
 733 static int
 734 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 735                             unsigned long long *options)
 736 {
 737         int status;
 738
 739         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 740         *options &= 3;
 741
 742         return status;
 743 }
 744
 745 /*
 746  *  Arg:
 747  *      video           : video bus device pointer
 748  *      bios_flag       :
 749  *              0.      The system BIOS should NOT automatically switch(toggle)
 750  *                      the active display output.
 751  *              1.      The system BIOS should automatically switch (toggle) the
 752  *                      active display output. No switch event.
 753  *              2.      The _DGS value should be locked.
 754  *              3.      The system BIOS should not automatically switch (toggle) the
 755  *                      active display output, but instead generate the display switch
 756  *                      event notify code.
 757  *      lcd_flag        :
 758  *              0.      The system BIOS should automatically control the brightness level
 759  *                      of the LCD when the power changes from AC to DC
 760  *              1.      The system BIOS should NOT automatically control the brightness
 761  *                      level of the LCD when the power changes from AC to DC.
 762  * Return Value:
 763  *              -1      wrong arg.
 764  */
 765
 766 static int
 767 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 768 {
 769         u64 status = 0;
 770         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 771         struct acpi_object_list args = { 1, &arg0 };
 772
 773
 774         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 775                 status = -1;
 776                 goto Failed;
 777         }
 778         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 779         video->dos_setting = arg0.integer.value;
 780         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 781
 782       Failed:
 783         return status;
 784 }
 785
 786 /*
 787  * Simple comparison function used to sort backlight levels.
 788  */
 789
 790 static int
 791 acpi_video_cmp_level(const void *a, const void *b)
 792 {
 793         return *(int *)a - *(int *)b;
 794 }
 795
 796 /*
 797  *  Arg:
 798  *      device  : video output device (LCD, CRT, ..)
 799  *
 800  *  Return Value:
 801  *      Maximum brightness level
 802  *
 803  *  Allocate and initialize device->brightness.
 804  */
 805
 806 static int
 807 acpi_video_init_brightness(struct acpi_video_device *device)
 808 {
 809         union acpi_object *obj = NULL;
 810         int i, max_level = 0, count = 0, level_ac_battery = 0;
 811         unsigned long long level, level_old;
 812         union acpi_object *o;
 813         struct acpi_video_device_brightness *br = NULL;
 814         int result = -EINVAL;
 815
 816         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 817                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 818                                                 "LCD brightness level\n"));
 819                 goto out;
 820         }
 821
 822         if (obj->package.count < 2)
 823                 goto out;
 824
 825         br = kzalloc(sizeof(*br), GFP_KERNEL);
 826         if (!br) {
 827                 printk(KERN_ERR "can't allocate memory\n");
 828                 result = -ENOMEM;
 829                 goto out;
 830         }
 831
 832         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 833                                 GFP_KERNEL);
 834         if (!br->levels) {
 835                 result = -ENOMEM;
 836                 goto out_free;
 837         }
 838
 839         for (i = 0; i < obj->package.count; i++) {
 840                 o = (union acpi_object *)&obj->package.elements[i];
 841                 if (o->type != ACPI_TYPE_INTEGER) {
 842                         printk(KERN_ERR PREFIX "Invalid data\n");
 843                         continue;
 844                 }
 845                 br->levels[count] = (u32) o->integer.value;
 846
 847                 if (br->levels[count] > max_level)
 848                         max_level = br->levels[count];
 849                 count++;
 850         }
 851
 852         /*
 853          * some buggy BIOS don't export the levels
 854          * when machine is on AC/Battery in _BCL package.
 855          * In this case, the first two elements in _BCL packages
 856          * are also supported brightness levels that OS should take care of.
 857          */
 858         for (i = 2; i < count; i++) {
 859                 if (br->levels[i] == br->levels[0])
 860                         level_ac_battery++;
 861                 if (br->levels[i] == br->levels[1])
 862                         level_ac_battery++;
 863         }
 864
 865         if (level_ac_battery < 2) {
 866                 level_ac_battery = 2 - level_ac_battery;
 867                 br->flags._BCL_no_ac_battery_levels = 1;
 868                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 869                         br->levels[i] = br->levels[i - level_ac_battery];
 870                 count += level_ac_battery;
 871         } else if (level_ac_battery > 2)
 872                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 873
 874         /* Check if the _BCL package is in a reversed order */
 875         if (max_level == br->levels[2]) {
 876                 br->flags._BCL_reversed = 1;
 877                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 878                         acpi_video_cmp_level, NULL);
 879         } else if (max_level != br->levels[count - 1])
 880                 ACPI_ERROR((AE_INFO,
 881                             "Found unordered _BCL package\n"));
 882
 883         br->count = count;
 884         device->brightness = br;
 885
 886         /* Check the input/output of _BQC/_BCL/_BCM */
 887         if ((max_level < 100) && (max_level <= (count - 2)))
 888                 br->flags._BCL_use_index = 1;
 889
 890         /*
 891          * _BCM is always consistent with _BCL,
 892          * at least for all the laptops we have ever seen.
 893          */
 894         br->flags._BCM_use_index = br->flags._BCL_use_index;
 895
 896         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 897         br->curr = level = max_level;
 898
 899         if (!device->cap._BQC)
 900                 goto set_level;
 901
 902         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 903         if (result)
 904                 goto out_free_levels;
 905
 906         /*
 907          * Set the level to maximum and check if _BQC uses indexed value
 908          */
 909         result = acpi_video_device_lcd_set_level(device, max_level);
 910         if (result)
 911                 goto out_free_levels;
 912
 913         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 914         if (result)
 915                 goto out_free_levels;
 916
 917         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 918
 919         if (!br->flags._BQC_use_index) {
 920                 /*
 921                  * Set the backlight to the initial state.
 922                  * On some buggy laptops, _BQC returns an uninitialized value
 923                  * when invoked for the first time, i.e. level_old is invalid.
 924                  * set the backlight to max_level in this case
 925                  */
 926                 for (i = 2; i < br->count; i++)
 927                         if (level_old == br->levels[i])
 928                                 level = level_old;
 929                 goto set_level;
 930         }
 931
 932         if (br->flags._BCL_reversed)
 933                 level_old = (br->count - 1) - level_old;
 934         level = br->levels[level_old];
 935
 936 set_level:
 937         result = acpi_video_device_lcd_set_level(device, level);
 938         if (result)
 939                 goto out_free_levels;
 940
 941         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 942                           "found %d brightness levels\n", count - 2));
 943         kfree(obj);
 944         return result;
 945
 946 out_free_levels:
 947         kfree(br->levels);
 948 out_free:
 949         kfree(br);
 950 out:
 951         device->brightness = NULL;
 952         kfree(obj);
 953         return result;
 954 }
 955
 956 /*
 957  *  Arg:
 958  *      device  : video output device (LCD, CRT, ..)
 959  *
 960  *  Return Value:
 961  *      None
 962  *
 963  *  Find out all required AML methods defined under the output
 964  *  device.
 965  */
 966
 967 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 968 {
 969         acpi_handle h_dummy1;
 970
 971         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 972                 device->cap._ADR = 1;
 973         }
 974         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 975                 device->cap._BCL = 1;
 976         }
 977         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 978                 device->cap._BCM = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 981                 device->cap._BQC = 1;
 982         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 983                                 &h_dummy1))) {
 984                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 985                 device->cap._BCQ = 1;
 986         }
 987
 988         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 989                 device->cap._DDC = 1;
 990         }
 991         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 992                 device->cap._DCS = 1;
 993         }
 994         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 995                 device->cap._DGS = 1;
 996         }
 997         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 998                 device->cap._DSS = 1;
 999         }
1000
1001         if (acpi_video_backlight_support()) {
1002                 struct backlight_properties props;
1003                 int result;
1004                 static int count = 0;
1005                 char *name;
1006
1007                 result = acpi_video_init_brightness(device);
1008                 if (result)
1009                         return;
1010                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1011                 if (!name)
1012                         return;
1013
1014                 sprintf(name, "acpi_video%d", count++);
1015                 memset(&props, 0, sizeof(struct backlight_properties));
1016                 props.max_brightness = device->brightness->count - 3;
1017                 device->backlight = backlight_device_register(name, NULL, device,
1018                                                               &acpi_backlight_ops,
1019                                                               &props);
1020                 kfree(name);
1021                 if (IS_ERR(device->backlight))
1022                         return;
1023
1024                 /*
1025                  * Save current brightness level in case we have to restore it
1026                  * before acpi_video_device_lcd_set_level() is called next time.
1027                  */
1028                 device->backlight->props.brightness =
1029                                 acpi_video_get_brightness(device->backlight);
1030
1031                 result = sysfs_create_link(&device->backlight->dev.kobj,
1032                                            &device->dev->dev.kobj, "device");
1033                 if (result)
1034                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1035
1036                 device->cooling_dev = thermal_cooling_device_register("LCD",
1037                                         device->dev, &video_cooling_ops);
1038                 if (IS_ERR(device->cooling_dev)) {
1039                         /*
1040                          * Set cooling_dev to NULL so we don't crash trying to
1041                          * free it.
1042                          * Also, why the hell we are returning early and
1043                          * not attempt to register video output if cooling
1044                          * device registration failed?
1045                          * -- dtor
1046                          */
1047                         device->cooling_dev = NULL;
1048                         return;
1049                 }
1050
1051                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1052                          device->cooling_dev->id);
1053                 result = sysfs_create_link(&device->dev->dev.kobj,
1054                                 &device->cooling_dev->device.kobj,
1055                                 "thermal_cooling");
1056                 if (result)
1057                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1058                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1059                                 &device->dev->dev.kobj, "device");
1060                 if (result)
1061                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1062
1063         }
1064
1065         if (acpi_video_display_switch_support()) {
1066
1067                 if (device->cap._DCS && device->cap._DSS) {
1068                         static int count;
1069                         char *name;
1070                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1071                         if (!name)
1072                                 return;
1073                         sprintf(name, "acpi_video%d", count++);
1074                         device->output_dev = video_output_register(name,
1075                                         NULL, device, &acpi_output_properties);
1076                         kfree(name);
1077                 }
1078         }
1079 }
1080
1081 /*
1082  *  Arg:
1083  *      device  : video output device (VGA)
1084  *
1085  *  Return Value:
1086  *      None
1087  *
1088  *  Find out all required AML methods defined under the video bus device.
1089  */
1090
1091 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1092 {
1093         acpi_handle h_dummy1;
1094
1095         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1096                 video->cap._DOS = 1;
1097         }
1098         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1099                 video->cap._DOD = 1;
1100         }
1101         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1102                 video->cap._ROM = 1;
1103         }
1104         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1105                 video->cap._GPD = 1;
1106         }
1107         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1108                 video->cap._SPD = 1;
1109         }
1110         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1111                 video->cap._VPO = 1;
1112         }
1113 }
1114
1115 /*
1116  * Check whether the video bus device has required AML method to
1117  * support the desired features
1118  */
1119
1120 static int acpi_video_bus_check(struct acpi_video_bus *video)
1121 {
1122         acpi_status status = -ENOENT;
1123         struct pci_dev *dev;
1124
1125         if (!video)
1126                 return -EINVAL;
1127
1128         dev = acpi_get_pci_dev(video->device->handle);
1129         if (!dev)
1130                 return -ENODEV;
1131         pci_dev_put(dev);
1132
1133         /* Since there is no HID, CID and so on for VGA driver, we have
1134          * to check well known required nodes.
1135          */
1136
1137         /* Does this device support video switching? */
1138         if (video->cap._DOS || video->cap._DOD) {
1139                 if (!video->cap._DOS) {
1140                         printk(KERN_WARNING FW_BUG
1141                                 "ACPI(%s) defines _DOD but not _DOS\n",
1142                                 acpi_device_bid(video->device));
1143                 }
1144                 video->flags.multihead = 1;
1145                 status = 0;
1146         }
1147
1148         /* Does this device support retrieving a video ROM? */
1149         if (video->cap._ROM) {
1150                 video->flags.rom = 1;
1151                 status = 0;
1152         }
1153
1154         /* Does this device support configuring which video device to POST? */
1155         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1156                 video->flags.post = 1;
1157                 status = 0;
1158         }
1159
1160         return status;
1161 }
1162
1163 /* --------------------------------------------------------------------------
1164                               FS Interface (/proc)
1165    -------------------------------------------------------------------------- */
1166
1167 static struct proc_dir_entry *acpi_video_dir;
1168
1169 /* video devices */
1170
1171 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1172 {
1173         struct acpi_video_device *dev = seq->private;
1174
1175
1176         if (!dev)
1177                 goto end;
1178
1179         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1180         seq_printf(seq, "type:         ");
1181         if (dev->flags.crt)
1182                 seq_printf(seq, "CRT\n");
1183         else if (dev->flags.lcd)
1184                 seq_printf(seq, "LCD\n");
1185         else if (dev->flags.tvout)
1186                 seq_printf(seq, "TVOUT\n");
1187         else if (dev->flags.dvi)
1188                 seq_printf(seq, "DVI\n");
1189         else
1190                 seq_printf(seq, "UNKNOWN\n");
1191
1192         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1193
1194       end:
1195         return 0;
1196 }
1197
1198 static int
1199 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1200 {
1201         return single_open(file, acpi_video_device_info_seq_show,
1202                            PDE(inode)->data);
1203 }
1204
1205 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1206 {
1207         int status;
1208         struct acpi_video_device *dev = seq->private;
1209         unsigned long long state;
1210
1211
1212         if (!dev)
1213                 goto end;
1214
1215         status = acpi_video_device_get_state(dev, &state);
1216         seq_printf(seq, "state:     ");
1217         if (ACPI_SUCCESS(status))
1218                 seq_printf(seq, "0x%02llx\n", state);
1219         else
1220                 seq_printf(seq, "<not supported>\n");
1221
1222         status = acpi_video_device_query(dev, &state);
1223         seq_printf(seq, "query:     ");
1224         if (ACPI_SUCCESS(status))
1225                 seq_printf(seq, "0x%02llx\n", state);
1226         else
1227                 seq_printf(seq, "<not supported>\n");
1228
1229       end:
1230         return 0;
1231 }
1232
1233 static int
1234 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1235 {
1236         return single_open(file, acpi_video_device_state_seq_show,
1237                            PDE(inode)->data);
1238 }
1239
1240 static ssize_t
1241 acpi_video_device_write_state(struct file *file,
1242                               const char __user * buffer,
1243                               size_t count, loff_t * data)
1244 {
1245         int status;
1246         struct seq_file *m = file->private_data;
1247         struct acpi_video_device *dev = m->private;
1248         char str[12] = { 0 };
1249         u32 state = 0;
1250
1251
1252         if (!dev || count >= sizeof(str))
1253                 return -EINVAL;
1254
1255         if (copy_from_user(str, buffer, count))
1256                 return -EFAULT;
1257
1258         str[count] = 0;
1259         state = simple_strtoul(str, NULL, 0);
1260         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1261
1262         status = acpi_video_device_set_state(dev, state);
1263
1264         if (status)
1265                 return -EFAULT;
1266
1267         return count;
1268 }
1269
1270 static int
1271 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1272 {
1273         struct acpi_video_device *dev = seq->private;
1274         int i;
1275
1276
1277         if (!dev || !dev->brightness) {
1278                 seq_printf(seq, "<not supported>\n");
1279                 return 0;
1280         }
1281
1282         seq_printf(seq, "levels: ");
1283         for (i = 2; i < dev->brightness->count; i++)
1284                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1285         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1286
1287         return 0;
1288 }
1289
1290 static int
1291 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1292 {
1293         return single_open(file, acpi_video_device_brightness_seq_show,
1294                            PDE(inode)->data);
1295 }
1296
1297 static ssize_t
1298 acpi_video_device_write_brightness(struct file *file,
1299                                    const char __user * buffer,
1300                                    size_t count, loff_t * data)
1301 {
1302         struct seq_file *m = file->private_data;
1303         struct acpi_video_device *dev = m->private;
1304         char str[5] = { 0 };
1305         unsigned int level = 0;
1306         int i;
1307
1308
1309         if (!dev || !dev->brightness || count >= sizeof(str))
1310                 return -EINVAL;
1311
1312         if (copy_from_user(str, buffer, count))
1313                 return -EFAULT;
1314
1315         str[count] = 0;
1316         level = simple_strtoul(str, NULL, 0);
1317
1318         if (level > 100)
1319                 return -EFAULT;
1320
1321         /* validate through the list of available levels */
1322         for (i = 2; i < dev->brightness->count; i++)
1323                 if (level == dev->brightness->levels[i]) {
1324                         if (!acpi_video_device_lcd_set_level(dev, level))
1325                                 return count;
1326                         break;
1327                 }
1328
1329         return -EINVAL;
1330 }
1331
1332 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1333 {
1334         struct acpi_video_device *dev = seq->private;
1335         int status;
1336         int i;
1337         union acpi_object *edid = NULL;
1338
1339
1340         if (!dev)
1341                 goto out;
1342
1343         status = acpi_video_device_EDID(dev, &edid, 128);
1344         if (ACPI_FAILURE(status)) {
1345                 status = acpi_video_device_EDID(dev, &edid, 256);
1346         }
1347
1348         if (ACPI_FAILURE(status)) {
1349                 goto out;
1350         }
1351
1352         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1353                 for (i = 0; i < edid->buffer.length; i++)
1354                         seq_putc(seq, edid->buffer.pointer[i]);
1355         }
1356
1357       out:
1358         if (!edid)
1359                 seq_printf(seq, "<not supported>\n");
1360         else
1361                 kfree(edid);
1362
1363         return 0;
1364 }
1365
1366 static int
1367 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1368 {
1369         return single_open(file, acpi_video_device_EDID_seq_show,
1370                            PDE(inode)->data);
1371 }
1372
1373 static int acpi_video_device_add_fs(struct acpi_device *device)
1374 {
1375         struct proc_dir_entry *entry, *device_dir;
1376         struct acpi_video_device *vid_dev;
1377
1378         vid_dev = acpi_driver_data(device);
1379         if (!vid_dev)
1380                 return -ENODEV;
1381
1382         device_dir = proc_mkdir(acpi_device_bid(device),
1383                                 vid_dev->video->dir);
1384         if (!device_dir)
1385                 return -ENOMEM;
1386
1387         /* 'info' [R] */
1388         entry = proc_create_data("info", S_IRUGO, device_dir,
1389                         &acpi_video_device_info_fops, acpi_driver_data(device));
1390         if (!entry)
1391                 goto err_remove_dir;
1392
1393         /* 'state' [R/W] */
1394         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1395                                  device_dir,
1396                                  &acpi_video_device_state_fops,
1397                                  acpi_driver_data(device));
1398         if (!entry)
1399                 goto err_remove_info;
1400
1401         /* 'brightness' [R/W] */
1402         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1403                                  device_dir,
1404                                  &acpi_video_device_brightness_fops,
1405                                  acpi_driver_data(device));
1406         if (!entry)
1407                 goto err_remove_state;
1408
1409         /* 'EDID' [R] */
1410         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1411                                  &acpi_video_device_EDID_fops,
1412                                  acpi_driver_data(device));
1413         if (!entry)
1414                 goto err_remove_brightness;
1415
1416         acpi_device_dir(device) = device_dir;
1417
1418         return 0;
1419
1420  err_remove_brightness:
1421         remove_proc_entry("brightness", device_dir);
1422  err_remove_state:
1423         remove_proc_entry("state", device_dir);
1424  err_remove_info:
1425         remove_proc_entry("info", device_dir);
1426  err_remove_dir:
1427         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1428         return -ENOMEM;
1429 }
1430
1431 static int acpi_video_device_remove_fs(struct acpi_device *device)
1432 {
1433         struct acpi_video_device *vid_dev;
1434         struct proc_dir_entry *device_dir;
1435
1436         vid_dev = acpi_driver_data(device);
1437         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1438                 return -ENODEV;
1439
1440         device_dir = acpi_device_dir(device);
1441         if (device_dir) {
1442                 remove_proc_entry("info", device_dir);
1443                 remove_proc_entry("state", device_dir);
1444                 remove_proc_entry("brightness", device_dir);
1445                 remove_proc_entry("EDID", device_dir);
1446                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1447                 acpi_device_dir(device) = NULL;
1448         }
1449
1450         return 0;
1451 }
1452
1453 /* video bus */
1454 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1455 {
1456         struct acpi_video_bus *video = seq->private;
1457
1458
1459         if (!video)
1460                 goto end;
1461
1462         seq_printf(seq, "Switching heads:              %s\n",
1463                    video->flags.multihead ? "yes" : "no");
1464         seq_printf(seq, "Video ROM:                    %s\n",
1465                    video->flags.rom ? "yes" : "no");
1466         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1467                    video->flags.post ? "yes" : "no");
1468
1469       end:
1470         return 0;
1471 }
1472
1473 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1474 {
1475         return single_open(file, acpi_video_bus_info_seq_show,
1476                            PDE(inode)->data);
1477 }
1478
1479 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1480 {
1481         struct acpi_video_bus *video = seq->private;
1482
1483
1484         if (!video)
1485                 goto end;
1486
1487         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1488         seq_printf(seq, "<TODO>\n");
1489
1490       end:
1491         return 0;
1492 }
1493
1494 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1495 {
1496         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1497 }
1498
1499 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1500 {
1501         struct acpi_video_bus *video = seq->private;
1502         unsigned long long options;
1503         int status;
1504
1505
1506         if (!video)
1507                 goto end;
1508
1509         status = acpi_video_bus_POST_options(video, &options);
1510         if (ACPI_SUCCESS(status)) {
1511                 if (!(options & 1)) {
1512                         printk(KERN_WARNING PREFIX
1513                                "The motherboard VGA device is not listed as a possible POST device.\n");
1514                         printk(KERN_WARNING PREFIX
1515                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1516                 }
1517                 printk(KERN_WARNING "%llx\n", options);
1518                 seq_printf(seq, "can POST: <integrated video>");
1519                 if (options & 2)
1520                         seq_printf(seq, " <PCI video>");
1521                 if (options & 4)
1522                         seq_printf(seq, " <AGP video>");
1523                 seq_putc(seq, '\n');
1524         } else
1525                 seq_printf(seq, "<not supported>\n");
1526       end:
1527         return 0;
1528 }
1529
1530 static int
1531 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1532 {
1533         return single_open(file, acpi_video_bus_POST_info_seq_show,
1534                            PDE(inode)->data);
1535 }
1536
1537 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1538 {
1539         struct acpi_video_bus *video = seq->private;
1540         int status;
1541         unsigned long long id;
1542
1543
1544         if (!video)
1545                 goto end;
1546
1547         status = acpi_video_bus_get_POST(video, &id);
1548         if (!ACPI_SUCCESS(status)) {
1549                 seq_printf(seq, "<not supported>\n");
1550                 goto end;
1551         }
1552         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1553
1554       end:
1555         return 0;
1556 }
1557
1558 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1559 {
1560         struct acpi_video_bus *video = seq->private;
1561
1562
1563         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1564
1565         return 0;
1566 }
1567
1568 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1569 {
1570         return single_open(file, acpi_video_bus_POST_seq_show,
1571                            PDE(inode)->data);
1572 }
1573
1574 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1575 {
1576         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1577 }
1578
1579 static ssize_t
1580 acpi_video_bus_write_POST(struct file *file,
1581                           const char __user * buffer,
1582                           size_t count, loff_t * data)
1583 {
1584         int status;
1585         struct seq_file *m = file->private_data;
1586         struct acpi_video_bus *video = m->private;
1587         char str[12] = { 0 };
1588         unsigned long long opt, options;
1589
1590
1591         if (!video || count >= sizeof(str))
1592                 return -EINVAL;
1593
1594         status = acpi_video_bus_POST_options(video, &options);
1595         if (!ACPI_SUCCESS(status))
1596                 return -EINVAL;
1597
1598         if (copy_from_user(str, buffer, count))
1599                 return -EFAULT;
1600
1601         str[count] = 0;
1602         opt = strtoul(str, NULL, 0);
1603         if (opt > 3)
1604                 return -EFAULT;
1605
1606         /* just in case an OEM 'forgot' the motherboard... */
1607         options |= 1;
1608
1609         if (options & (1ul << opt)) {
1610                 status = acpi_video_bus_set_POST(video, opt);
1611                 if (!ACPI_SUCCESS(status))
1612                         return -EFAULT;
1613
1614         }
1615
1616         return count;
1617 }
1618
1619 static ssize_t
1620 acpi_video_bus_write_DOS(struct file *file,
1621                          const char __user * buffer,
1622                          size_t count, loff_t * data)
1623 {
1624         int status;
1625         struct seq_file *m = file->private_data;
1626         struct acpi_video_bus *video = m->private;
1627         char str[12] = { 0 };
1628         unsigned long opt;
1629
1630
1631         if (!video || count >= sizeof(str))
1632                 return -EINVAL;
1633
1634         if (copy_from_user(str, buffer, count))
1635                 return -EFAULT;
1636
1637         str[count] = 0;
1638         opt = strtoul(str, NULL, 0);
1639         if (opt > 7)
1640                 return -EFAULT;
1641
1642         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1643
1644         if (!ACPI_SUCCESS(status))
1645                 return -EFAULT;
1646
1647         return count;
1648 }
1649
1650 static int acpi_video_bus_add_fs(struct acpi_device *device)
1651 {
1652         struct acpi_video_bus *video = acpi_driver_data(device);
1653         struct proc_dir_entry *device_dir;
1654         struct proc_dir_entry *entry;
1655
1656         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1657         if (!device_dir)
1658                 return -ENOMEM;
1659
1660         /* 'info' [R] */
1661         entry = proc_create_data("info", S_IRUGO, device_dir,
1662                                  &acpi_video_bus_info_fops,
1663                                  acpi_driver_data(device));
1664         if (!entry)
1665                 goto err_remove_dir;
1666
1667         /* 'ROM' [R] */
1668         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1669                                  &acpi_video_bus_ROM_fops,
1670                                  acpi_driver_data(device));
1671         if (!entry)
1672                 goto err_remove_info;
1673
1674         /* 'POST_info' [R] */
1675         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1676                                  &acpi_video_bus_POST_info_fops,
1677                                  acpi_driver_data(device));
1678         if (!entry)
1679                 goto err_remove_rom;
1680
1681         /* 'POST' [R/W] */
1682         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1683                                  device_dir,
1684                                  &acpi_video_bus_POST_fops,
1685                                  acpi_driver_data(device));
1686         if (!entry)
1687                 goto err_remove_post_info;
1688
1689         /* 'DOS' [R/W] */
1690         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1691                                  device_dir,
1692                                  &acpi_video_bus_DOS_fops,
1693                                  acpi_driver_data(device));
1694         if (!entry)
1695                 goto err_remove_post;
1696
1697         video->dir = acpi_device_dir(device) = device_dir;
1698         return 0;
1699
1700  err_remove_post:
1701         remove_proc_entry("POST", device_dir);
1702  err_remove_post_info:
1703         remove_proc_entry("POST_info", device_dir);
1704  err_remove_rom:
1705         remove_proc_entry("ROM", device_dir);
1706  err_remove_info:
1707         remove_proc_entry("info", device_dir);
1708  err_remove_dir:
1709         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1710         return -ENOMEM;
1711 }
1712
1713 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1714 {
1715         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1716
1717         if (device_dir) {
1718                 remove_proc_entry("info", device_dir);
1719                 remove_proc_entry("ROM", device_dir);
1720                 remove_proc_entry("POST_info", device_dir);
1721                 remove_proc_entry("POST", device_dir);
1722                 remove_proc_entry("DOS", device_dir);
1723                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1724                 acpi_device_dir(device) = NULL;
1725         }
1726
1727         return 0;
1728 }
1729
1730 /* --------------------------------------------------------------------------
1731                                  Driver Interface
1732    -------------------------------------------------------------------------- */
1733
1734 /* device interface */
1735 static struct acpi_video_device_attrib*
1736 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1737 {
1738         struct acpi_video_enumerated_device *ids;
1739         int i;
1740
1741         for (i = 0; i < video->attached_count; i++) {
1742                 ids = &video->attached_array[i];
1743                 if ((ids->value.int_val & 0xffff) == device_id)
1744                         return &ids->value.attrib;
1745         }
1746
1747         return NULL;
1748 }
1749
1750 static int
1751 acpi_video_bus_get_one_device(struct acpi_device *device,
1752                               struct acpi_video_bus *video)
1753 {
1754         unsigned long long device_id;
1755         int status;
1756         struct acpi_video_device *data;
1757         struct acpi_video_device_attrib* attribute;
1758
1759         if (!device || !video)
1760                 return -EINVAL;
1761
1762         status =
1763             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1764         if (ACPI_SUCCESS(status)) {
1765
1766                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1767                 if (!data)
1768                         return -ENOMEM;
1769
1770                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1771                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1772                 device->driver_data = data;
1773
1774                 data->device_id = device_id;
1775                 data->video = video;
1776                 data->dev = device;
1777
1778                 attribute = acpi_video_get_device_attr(video, device_id);
1779
1780                 if((attribute != NULL) && attribute->device_id_scheme) {
1781                         switch (attribute->display_type) {
1782                         case ACPI_VIDEO_DISPLAY_CRT:
1783                                 data->flags.crt = 1;
1784                                 break;
1785                         case ACPI_VIDEO_DISPLAY_TV:
1786                                 data->flags.tvout = 1;
1787                                 break;
1788                         case ACPI_VIDEO_DISPLAY_DVI:
1789                                 data->flags.dvi = 1;
1790                                 break;
1791                         case ACPI_VIDEO_DISPLAY_LCD:
1792                                 data->flags.lcd = 1;
1793                                 break;
1794                         default:
1795                                 data->flags.unknown = 1;
1796                                 break;
1797                         }
1798                         if(attribute->bios_can_detect)
1799                                 data->flags.bios = 1;
1800                 } else
1801                         data->flags.unknown = 1;
1802
1803                 acpi_video_device_bind(video, data);
1804                 acpi_video_device_find_cap(data);
1805
1806                 status = acpi_install_notify_handler(device->handle,
1807                                                      ACPI_DEVICE_NOTIFY,
1808                                                      acpi_video_device_notify,
1809                                                      data);
1810                 if (ACPI_FAILURE(status)) {
1811                         printk(KERN_ERR PREFIX
1812                                           "Error installing notify handler\n");
1813                         if(data->brightness)
1814                                 kfree(data->brightness->levels);
1815                         kfree(data->brightness);
1816                         kfree(data);
1817                         return -ENODEV;
1818                 }
1819
1820                 mutex_lock(&video->device_list_lock);
1821                 list_add_tail(&data->entry, &video->video_device_list);
1822                 mutex_unlock(&video->device_list_lock);
1823
1824                 acpi_video_device_add_fs(device);
1825
1826                 return 0;
1827         }
1828
1829         return -ENOENT;
1830 }
1831
1832 /*
1833  *  Arg:
1834  *      video   : video bus device
1835  *
1836  *  Return:
1837  *      none
1838  *
1839  *  Enumerate the video device list of the video bus,
1840  *  bind the ids with the corresponding video devices
1841  *  under the video bus.
1842  */
1843
1844 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1845 {
1846         struct acpi_video_device *dev;
1847
1848         mutex_lock(&video->device_list_lock);
1849
1850         list_for_each_entry(dev, &video->video_device_list, entry)
1851                 acpi_video_device_bind(video, dev);
1852
1853         mutex_unlock(&video->device_list_lock);
1854 }
1855
1856 /*
1857  *  Arg:
1858  *      video   : video bus device
1859  *      device  : video output device under the video
1860  *              bus
1861  *
1862  *  Return:
1863  *      none
1864  *
1865  *  Bind the ids with the corresponding video devices
1866  *  under the video bus.
1867  */
1868
1869 static void
1870 acpi_video_device_bind(struct acpi_video_bus *video,
1871                        struct acpi_video_device *device)
1872 {
1873         struct acpi_video_enumerated_device *ids;
1874         int i;
1875
1876         for (i = 0; i < video->attached_count; i++) {
1877                 ids = &video->attached_array[i];
1878                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1879                         ids->bind_info = device;
1880                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1881                 }
1882         }
1883 }
1884
1885 /*
1886  *  Arg:
1887  *      video   : video bus device
1888  *
1889  *  Return:
1890  *      < 0     : error
1891  *
1892  *  Call _DOD to enumerate all devices attached to display adapter
1893  *
1894  */
1895
1896 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1897 {
1898         int status;
1899         int count;
1900         int i;
1901         struct acpi_video_enumerated_device *active_list;
1902         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1903         union acpi_object *dod = NULL;
1904         union acpi_object *obj;
1905
1906         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1907         if (!ACPI_SUCCESS(status)) {
1908                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1909                 return status;
1910         }
1911
1912         dod = buffer.pointer;
1913         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1914                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1915                 status = -EFAULT;
1916                 goto out;
1917         }
1918
1919         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1920                           dod->package.count));
1921
1922         active_list = kcalloc(1 + dod->package.count,
1923                               sizeof(struct acpi_video_enumerated_device),
1924                               GFP_KERNEL);
1925         if (!active_list) {
1926                 status = -ENOMEM;
1927                 goto out;
1928         }
1929
1930         count = 0;
1931         for (i = 0; i < dod->package.count; i++) {
1932                 obj = &dod->package.elements[i];
1933
1934                 if (obj->type != ACPI_TYPE_INTEGER) {
1935                         printk(KERN_ERR PREFIX
1936                                 "Invalid _DOD data in element %d\n", i);
1937                         continue;
1938                 }
1939
1940                 active_list[count].value.int_val = obj->integer.value;
1941                 active_list[count].bind_info = NULL;
1942                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1943                                   (int)obj->integer.value));
1944                 count++;
1945         }
1946
1947         kfree(video->attached_array);
1948
1949         video->attached_array = active_list;
1950         video->attached_count = count;
1951
1952  out:
1953         kfree(buffer.pointer);
1954         return status;
1955 }
1956
1957 static int
1958 acpi_video_get_next_level(struct acpi_video_device *device,
1959                           u32 level_current, u32 event)
1960 {
1961         int min, max, min_above, max_below, i, l, delta = 255;
1962         max = max_below = 0;
1963         min = min_above = 255;
1964         /* Find closest level to level_current */
1965         for (i = 2; i < device->brightness->count; i++) {
1966                 l = device->brightness->levels[i];
1967                 if (abs(l - level_current) < abs(delta)) {
1968                         delta = l - level_current;
1969                         if (!delta)
1970                                 break;
1971                 }
1972         }
1973         /* Ajust level_current to closest available level */
1974         level_current += delta;
1975         for (i = 2; i < device->brightness->count; i++) {
1976                 l = device->brightness->levels[i];
1977                 if (l < min)
1978                         min = l;
1979                 if (l > max)
1980                         max = l;
1981                 if (l < min_above && l > level_current)
1982                         min_above = l;
1983                 if (l > max_below && l < level_current)
1984                         max_below = l;
1985         }
1986
1987         switch (event) {
1988         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1989                 return (level_current < max) ? min_above : min;
1990         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1991                 return (level_current < max) ? min_above : max;
1992         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1993                 return (level_current > min) ? max_below : min;
1994         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1995         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1996                 return 0;
1997         default:
1998                 return level_current;
1999         }
2000 }
2001
2002 static int
2003 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2004 {
2005         unsigned long long level_current, level_next;
2006         int result = -EINVAL;
2007
2008         /* no warning message if acpi_backlight=vendor is used */
2009         if (!acpi_video_backlight_support())
2010                 return 0;
2011
2012         if (!device->brightness)
2013                 goto out;
2014
2015         result = acpi_video_device_lcd_get_level_current(device,
2016                                                          &level_current, 0);
2017         if (result)
2018                 goto out;
2019
2020         level_next = acpi_video_get_next_level(device, level_current, event);
2021
2022         result = acpi_video_device_lcd_set_level(device, level_next);
2023
2024         if (!result)
2025                 backlight_force_update(device->backlight,
2026                                        BACKLIGHT_UPDATE_HOTKEY);
2027
2028 out:
2029         if (result)
2030                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2031
2032         return result;
2033 }
2034
2035 static int
2036 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2037                            struct acpi_device *device)
2038 {
2039         int status = 0;
2040         struct acpi_device *dev;
2041
2042         acpi_video_device_enumerate(video);
2043
2044         list_for_each_entry(dev, &device->children, node) {
2045
2046                 status = acpi_video_bus_get_one_device(dev, video);
2047                 if (ACPI_FAILURE(status)) {
2048                         printk(KERN_WARNING PREFIX
2049                                         "Cant attach device");
2050                         continue;
2051                 }
2052         }
2053         return status;
2054 }
2055
2056 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2057 {
2058         acpi_status status;
2059         struct acpi_video_bus *video;
2060
2061
2062         if (!device || !device->video)
2063                 return -ENOENT;
2064
2065         video = device->video;
2066
2067         acpi_video_device_remove_fs(device->dev);
2068
2069         status = acpi_remove_notify_handler(device->dev->handle,
2070                                             ACPI_DEVICE_NOTIFY,
2071                                             acpi_video_device_notify);
2072         if (device->backlight) {
2073                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2074                 backlight_device_unregister(device->backlight);
2075                 device->backlight = NULL;
2076         }
2077         if (device->cooling_dev) {
2078                 sysfs_remove_link(&device->dev->dev.kobj,
2079                                   "thermal_cooling");
2080                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2081                                   "device");
2082                 thermal_cooling_device_unregister(device->cooling_dev);
2083                 device->cooling_dev = NULL;
2084         }
2085         video_output_unregister(device->output_dev);
2086
2087         return 0;
2088 }
2089
2090 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2091 {
2092         int status;
2093         struct acpi_video_device *dev, *next;
2094
2095         mutex_lock(&video->device_list_lock);
2096
2097         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2098
2099                 status = acpi_video_bus_put_one_device(dev);
2100                 if (ACPI_FAILURE(status))
2101                         printk(KERN_WARNING PREFIX
2102                                "hhuuhhuu bug in acpi video driver.\n");
2103
2104                 if (dev->brightness) {
2105                         kfree(dev->brightness->levels);
2106                         kfree(dev->brightness);
2107                 }
2108                 list_del(&dev->entry);
2109                 kfree(dev);
2110         }
2111
2112         mutex_unlock(&video->device_list_lock);
2113
2114         return 0;
2115 }
2116
2117 /* acpi_video interface */
2118
2119 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2120 {
2121         return acpi_video_bus_DOS(video, 0, 0);
2122 }
2123
2124 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2125 {
2126         return acpi_video_bus_DOS(video, 0, 1);
2127 }
2128
2129 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2130 {
2131         struct acpi_video_bus *video = acpi_driver_data(device);
2132         struct input_dev *input;
2133         int keycode = 0;
2134
2135         if (!video)
2136                 return;
2137
2138         input = video->input;
2139
2140         switch (event) {
2141         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2142                                          * most likely via hotkey. */
2143                 acpi_bus_generate_proc_event(device, event, 0);
2144                 keycode = KEY_SWITCHVIDEOMODE;
2145                 break;
2146
2147         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2148                                          * connector. */
2149                 acpi_video_device_enumerate(video);
2150                 acpi_video_device_rebind(video);
2151                 acpi_bus_generate_proc_event(device, event, 0);
2152                 keycode = KEY_SWITCHVIDEOMODE;
2153                 break;
2154
2155         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2156                 acpi_bus_generate_proc_event(device, event, 0);
2157                 keycode = KEY_SWITCHVIDEOMODE;
2158                 break;
2159         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2160                 acpi_bus_generate_proc_event(device, event, 0);
2161                 keycode = KEY_VIDEO_NEXT;
2162                 break;
2163         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2164                 acpi_bus_generate_proc_event(device, event, 0);
2165                 keycode = KEY_VIDEO_PREV;
2166                 break;
2167
2168         default:
2169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2170                                   "Unsupported event [0x%x]\n", event));
2171                 break;
2172         }
2173
2174         acpi_notifier_call_chain(device, event, 0);
2175
2176         if (keycode) {
2177                 input_report_key(input, keycode, 1);
2178                 input_sync(input);
2179                 input_report_key(input, keycode, 0);
2180                 input_sync(input);
2181         }
2182
2183         return;
2184 }
2185
2186 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2187 {
2188         struct acpi_video_device *video_device = data;
2189         struct acpi_device *device = NULL;
2190         struct acpi_video_bus *bus;
2191         struct input_dev *input;
2192         int keycode = 0;
2193
2194         if (!video_device)
2195                 return;
2196
2197         device = video_device->dev;
2198         bus = video_device->video;
2199         input = bus->input;
2200
2201         switch (event) {
2202         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2203                 if (brightness_switch_enabled)
2204                         acpi_video_switch_brightness(video_device, event);
2205                 acpi_bus_generate_proc_event(device, event, 0);
2206                 keycode = KEY_BRIGHTNESS_CYCLE;
2207                 break;
2208         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2209                 if (brightness_switch_enabled)
2210                         acpi_video_switch_brightness(video_device, event);
2211                 acpi_bus_generate_proc_event(device, event, 0);
2212                 keycode = KEY_BRIGHTNESSUP;
2213                 break;
2214         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2215                 if (brightness_switch_enabled)
2216                         acpi_video_switch_brightness(video_device, event);
2217                 acpi_bus_generate_proc_event(device, event, 0);
2218                 keycode = KEY_BRIGHTNESSDOWN;
2219                 break;
2220         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2221                 if (brightness_switch_enabled)
2222                         acpi_video_switch_brightness(video_device, event);
2223                 acpi_bus_generate_proc_event(device, event, 0);
2224                 keycode = KEY_BRIGHTNESS_ZERO;
2225                 break;
2226         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2227                 if (brightness_switch_enabled)
2228                         acpi_video_switch_brightness(video_device, event);
2229                 acpi_bus_generate_proc_event(device, event, 0);
2230                 keycode = KEY_DISPLAY_OFF;
2231                 break;
2232         default:
2233                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2234                                   "Unsupported event [0x%x]\n", event));
2235                 break;
2236         }
2237
2238         acpi_notifier_call_chain(device, event, 0);
2239
2240         if (keycode) {
2241                 input_report_key(input, keycode, 1);
2242                 input_sync(input);
2243                 input_report_key(input, keycode, 0);
2244                 input_sync(input);
2245         }
2246
2247         return;
2248 }
2249
2250 static int acpi_video_resume(struct notifier_block *nb,
2251                                 unsigned long val, void *ign)
2252 {
2253         struct acpi_video_bus *video;
2254         struct acpi_video_device *video_device;
2255         int i;
2256
2257         switch (val) {
2258         case PM_HIBERNATION_PREPARE:
2259         case PM_SUSPEND_PREPARE:
2260         case PM_RESTORE_PREPARE:
2261                 return NOTIFY_DONE;
2262         }
2263
2264         video = container_of(nb, struct acpi_video_bus, pm_nb);
2265
2266         dev_info(&video->device->dev, "Restoring backlight state\n");
2267
2268         for (i = 0; i < video->attached_count; i++) {
2269                 video_device = video->attached_array[i].bind_info;
2270                 if (video_device && video_device->backlight)
2271                         acpi_video_set_brightness(video_device->backlight);
2272         }
2273
2274         return NOTIFY_OK;
2275 }
2276
2277 static acpi_status
2278 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2279                         void **return_value)
2280 {
2281         struct acpi_device *device = context;
2282         struct acpi_device *sibling;
2283         int result;
2284
2285         if (handle == device->handle)
2286                 return AE_CTRL_TERMINATE;
2287
2288         result = acpi_bus_get_device(handle, &sibling);
2289         if (result)
2290                 return AE_OK;
2291
2292         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2293                         return AE_ALREADY_EXISTS;
2294
2295         return AE_OK;
2296 }
2297
2298 static int instance;
2299
2300 static int acpi_video_bus_add(struct acpi_device *device)
2301 {
2302         struct acpi_video_bus *video;
2303         struct input_dev *input;
2304         int error;
2305         acpi_status status;
2306
2307         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2308                                 device->parent->handle, 1,
2309                                 acpi_video_bus_match, NULL,
2310                                 device, NULL);
2311         if (status == AE_ALREADY_EXISTS) {
2312                 printk(KERN_WARNING FW_BUG
2313                         "Duplicate ACPI video bus devices for the"
2314                         " same VGA controller, please try module "
2315                         "parameter \"video.allow_duplicates=1\""
2316                         "if the current driver doesn't work.\n");
2317                 if (!allow_duplicates)
2318                         return -ENODEV;
2319         }
2320
2321         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2322         if (!video)
2323                 return -ENOMEM;
2324
2325         /* a hack to fix the duplicate name "VID" problem on T61 */
2326         if (!strcmp(device->pnp.bus_id, "VID")) {
2327                 if (instance)
2328                         device->pnp.bus_id[3] = '0' + instance;
2329                 instance ++;
2330         }
2331         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2332         if (!strcmp(device->pnp.bus_id, "VGA")) {
2333                 if (instance)
2334                         device->pnp.bus_id[3] = '0' + instance;
2335                 instance++;
2336         }
2337
2338         video->device = device;
2339         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2340         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2341         device->driver_data = video;
2342
2343         acpi_video_bus_find_cap(video);
2344         error = acpi_video_bus_check(video);
2345         if (error)
2346                 goto err_free_video;
2347
2348         error = acpi_video_bus_add_fs(device);
2349         if (error)
2350                 goto err_free_video;
2351
2352         mutex_init(&video->device_list_lock);
2353         INIT_LIST_HEAD(&video->video_device_list);
2354
2355         acpi_video_bus_get_devices(video, device);
2356         acpi_video_bus_start_devices(video);
2357
2358         video->input = input = input_allocate_device();
2359         if (!input) {
2360                 error = -ENOMEM;
2361                 goto err_stop_video;
2362         }
2363
2364         snprintf(video->phys, sizeof(video->phys),
2365                 "%s/video/input0", acpi_device_hid(video->device));
2366
2367         input->name = acpi_device_name(video->device);
2368         input->phys = video->phys;
2369         input->id.bustype = BUS_HOST;
2370         input->id.product = 0x06;
2371         input->dev.parent = &device->dev;
2372         input->evbit[0] = BIT(EV_KEY);
2373         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2374         set_bit(KEY_VIDEO_NEXT, input->keybit);
2375         set_bit(KEY_VIDEO_PREV, input->keybit);
2376         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2377         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2378         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2379         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2380         set_bit(KEY_DISPLAY_OFF, input->keybit);
2381
2382         error = input_register_device(input);
2383         if (error)
2384                 goto err_free_input_dev;
2385
2386         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2387                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2388                video->flags.multihead ? "yes" : "no",
2389                video->flags.rom ? "yes" : "no",
2390                video->flags.post ? "yes" : "no");
2391
2392         video->pm_nb.notifier_call = acpi_video_resume;
2393         video->pm_nb.priority = 0;
2394         register_pm_notifier(&video->pm_nb);
2395
2396         return 0;
2397
2398  err_free_input_dev:
2399         input_free_device(input);
2400  err_stop_video:
2401         acpi_video_bus_stop_devices(video);
2402         acpi_video_bus_put_devices(video);
2403         kfree(video->attached_array);
2404         acpi_video_bus_remove_fs(device);
2405  err_free_video:
2406         kfree(video);
2407         device->driver_data = NULL;
2408
2409         return error;
2410 }
2411
2412 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2413 {
2414         struct acpi_video_bus *video = NULL;
2415
2416
2417         if (!device || !acpi_driver_data(device))
2418                 return -EINVAL;
2419
2420         video = acpi_driver_data(device);
2421
2422         unregister_pm_notifier(&video->pm_nb);
2423
2424         acpi_video_bus_stop_devices(video);
2425         acpi_video_bus_put_devices(video);
2426         acpi_video_bus_remove_fs(device);
2427
2428         input_unregister_device(video->input);
2429         kfree(video->attached_array);
2430         kfree(video);
2431
2432         return 0;
2433 }
2434
2435 static int __init intel_opregion_present(void)
2436 {
2437 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2438         struct pci_dev *dev = NULL;
2439         u32 address;
2440
2441         for_each_pci_dev(dev) {
2442                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2443                         continue;
2444                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2445                         continue;
2446                 pci_read_config_dword(dev, 0xfc, &address);
2447                 if (!address)
2448                         continue;
2449                 return 1;
2450         }
2451 #endif
2452         return 0;
2453 }
2454
2455 int acpi_video_register(void)
2456 {
2457         int result = 0;
2458         if (register_count) {
2459                 /*
2460                  * if the function of acpi_video_register is already called,
2461                  * don't register the acpi_vide_bus again and return no error.
2462                  */
2463                 return 0;
2464         }
2465
2466         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2467         if (!acpi_video_dir)
2468                 return -ENODEV;
2469
2470         result = acpi_bus_register_driver(&acpi_video_bus);
2471         if (result < 0) {
2472                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2473                 return -ENODEV;
2474         }
2475
2476         /*
2477          * When the acpi_video_bus is loaded successfully, increase
2478          * the counter reference.
2479          */
2480         register_count = 1;
2481
2482         return 0;
2483 }
2484 EXPORT_SYMBOL(acpi_video_register);
2485
2486 void acpi_video_unregister(void)
2487 {
2488         if (!register_count) {
2489                 /*
2490                  * If the acpi video bus is already unloaded, don't
2491                  * unload it again and return directly.
2492                  */
2493                 return;
2494         }
2495         acpi_bus_unregister_driver(&acpi_video_bus);
2496
2497         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2498
2499         register_count = 0;
2500
2501         return;
2502 }
2503 EXPORT_SYMBOL(acpi_video_unregister);
2504
2505 /*
2506  * This is kind of nasty. Hardware using Intel chipsets may require
2507  * the video opregion code to be run first in order to initialise
2508  * state before any ACPI video calls are made. To handle this we defer
2509  * registration of the video class until the opregion code has run.
2510  */
2511
2512 static int __init acpi_video_init(void)
2513 {
2514         dmi_check_system(video_dmi_table);
2515
2516         if (intel_opregion_present())
2517                 return 0;
2518
2519         return acpi_video_register();
2520 }
2521
2522 static void __exit acpi_video_exit(void)
2523 {
2524         acpi_video_unregister();
2525
2526         return;
2527 }
2528
2529 module_init(acpi_video_init);
2530 module_exit(acpi_video_exit);