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/input.h>
  34 #include <linux/backlight.h>
  35 #include <linux/thermal.h>
  36 #include <linux/sort.h>
  37 #include <linux/pci.h>
  38 #include <linux/pci_ids.h>
  39 #include <linux/slab.h>
  40 #include <asm/uaccess.h>
  41 #include <linux/dmi.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44 #include <linux/suspend.h>
  45 #include <acpi/video.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  50 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  51 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  52 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  53 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  56
  57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  62
  63 #define MAX_NAME_LEN    20
  64
  65 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  66 ACPI_MODULE_NAME("video");
  67
  68 MODULE_AUTHOR("Bruno Ducrot");
  69 MODULE_DESCRIPTION("ACPI Video Driver");
  70 MODULE_LICENSE("GPL");
  71
  72 static int brightness_switch_enabled = 1;
  73 module_param(brightness_switch_enabled, bool, 0644);
  74
  75 /*
  76  * By default, we don't allow duplicate ACPI video bus devices
  77  * under the same VGA controller
  78  */
  79 static int allow_duplicates;
  80 module_param(allow_duplicates, bool, 0644);
  81
  82 /*
  83  * Some BIOSes claim they use minimum backlight at boot,
  84  * and this may bring dimming screen after boot
  85  */
  86 static int use_bios_initial_backlight = 1;
  87 module_param(use_bios_initial_backlight, bool, 0644);
  88
  89 static int register_count = 0;
  90 static int acpi_video_bus_add(struct acpi_device *device);
  91 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  93
  94 static const struct acpi_device_id video_device_ids[] = {
  95         {ACPI_VIDEO_HID, 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  99
 100 static struct acpi_driver acpi_video_bus = {
 101         .name = "video",
 102         .class = ACPI_VIDEO_CLASS,
 103         .ids = video_device_ids,
 104         .ops = {
 105                 .add = acpi_video_bus_add,
 106                 .remove = acpi_video_bus_remove,
 107                 .notify = acpi_video_bus_notify,
 108                 },
 109 };
 110
 111 struct acpi_video_bus_flags {
 112         u8 multihead:1;         /* can switch video heads */
 113         u8 rom:1;               /* can retrieve a video rom */
 114         u8 post:1;              /* can configure the head to */
 115         u8 reserved:5;
 116 };
 117
 118 struct acpi_video_bus_cap {
 119         u8 _DOS:1;              /*Enable/Disable output switching */
 120         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 121         u8 _ROM:1;              /*Get ROM Data */
 122         u8 _GPD:1;              /*Get POST Device */
 123         u8 _SPD:1;              /*Set POST Device */
 124         u8 _VPO:1;              /*Video POST Options */
 125         u8 reserved:2;
 126 };
 127
 128 struct acpi_video_device_attrib {
 129         u32 display_index:4;    /* A zero-based instance of the Display */
 130         u32 display_port_attachment:4;  /*This field differentiates the display type */
 131         u32 display_type:4;     /*Describe the specific type in use */
 132         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 133         u32 bios_can_detect:1;  /*BIOS can detect the device */
 134         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 135                                    the VGA device. */
 136         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 137         u32 reserved:10;        /*Must be 0 */
 138         u32 device_id_scheme:1; /*Device ID Scheme */
 139 };
 140
 141 struct acpi_video_enumerated_device {
 142         union {
 143                 u32 int_val;
 144                 struct acpi_video_device_attrib attrib;
 145         } value;
 146         struct acpi_video_device *bind_info;
 147 };
 148
 149 struct acpi_video_bus {
 150         struct acpi_device *device;
 151         u8 dos_setting;
 152         struct acpi_video_enumerated_device *attached_array;
 153         u8 attached_count;
 154         struct acpi_video_bus_cap cap;
 155         struct acpi_video_bus_flags flags;
 156         struct list_head video_device_list;
 157         struct mutex device_list_lock;  /* protects video_device_list */
 158         struct input_dev *input;
 159         char phys[32];  /* for input device */
 160         struct notifier_block pm_nb;
 161 };
 162
 163 struct acpi_video_device_flags {
 164         u8 crt:1;
 165         u8 lcd:1;
 166         u8 tvout:1;
 167         u8 dvi:1;
 168         u8 bios:1;
 169         u8 unknown:1;
 170         u8 reserved:2;
 171 };
 172
 173 struct acpi_video_device_cap {
 174         u8 _ADR:1;              /*Return the unique ID */
 175         u8 _BCL:1;              /*Query list of brightness control levels supported */
 176         u8 _BCM:1;              /*Set the brightness level */
 177         u8 _BQC:1;              /* Get current brightness level */
 178         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 179         u8 _DDC:1;              /*Return the EDID for this device */
 180 };
 181
 182 struct acpi_video_brightness_flags {
 183         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 184         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 185         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 186         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 187         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 188 };
 189
 190 struct acpi_video_device_brightness {
 191         int curr;
 192         int count;
 193         int *levels;
 194         struct acpi_video_brightness_flags flags;
 195 };
 196
 197 struct acpi_video_device {
 198         unsigned long device_id;
 199         struct acpi_video_device_flags flags;
 200         struct acpi_video_device_cap cap;
 201         struct list_head entry;
 202         struct acpi_video_bus *video;
 203         struct acpi_device *dev;
 204         struct acpi_video_device_brightness *brightness;
 205         struct backlight_device *backlight;
 206         struct thermal_cooling_device *cooling_dev;
 207 };
 208
 209 static const char device_decode[][30] = {
 210         "motherboard VGA device",
 211         "PCI VGA device",
 212         "AGP VGA device",
 213         "UNKNOWN",
 214 };
 215
 216 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 217 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 218 static void acpi_video_device_bind(struct acpi_video_bus *video,
 219                                    struct acpi_video_device *device);
 220 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 221 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 222                         int level);
 223 static int acpi_video_device_lcd_get_level_current(
 224                         struct acpi_video_device *device,
 225                         unsigned long long *level, int init);
 226 static int acpi_video_get_next_level(struct acpi_video_device *device,
 227                                      u32 level_current, u32 event);
 228 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 229                                          int event);
 230
 231 /*backlight device sysfs support*/
 232 static int acpi_video_get_brightness(struct backlight_device *bd)
 233 {
 234         unsigned long long cur_level;
 235         int i;
 236         struct acpi_video_device *vd =
 237                 (struct acpi_video_device *)bl_get_data(bd);
 238
 239         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 240                 return -EINVAL;
 241         for (i = 2; i < vd->brightness->count; i++) {
 242                 if (vd->brightness->levels[i] == cur_level)
 243                         /* The first two entries are special - see page 575
 244                            of the ACPI spec 3.0 */
 245                         return i-2;
 246         }
 247         return 0;
 248 }
 249
 250 static int acpi_video_set_brightness(struct backlight_device *bd)
 251 {
 252         int request_level = bd->props.brightness + 2;
 253         struct acpi_video_device *vd =
 254                 (struct acpi_video_device *)bl_get_data(bd);
 255
 256         return acpi_video_device_lcd_set_level(vd,
 257                                 vd->brightness->levels[request_level]);
 258 }
 259
 260 static const struct backlight_ops acpi_backlight_ops = {
 261         .get_brightness = acpi_video_get_brightness,
 262         .update_status  = acpi_video_set_brightness,
 263 };
 264
 265 /* thermal cooling device callbacks */
 266 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 267                                long *state)
 268 {
 269         struct acpi_device *device = cooling_dev->devdata;
 270         struct acpi_video_device *video = acpi_driver_data(device);
 271
 272         *state = video->brightness->count - 3;
 273         return 0;
 274 }
 275
 276 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 277                                long *state)
 278 {
 279         struct acpi_device *device = cooling_dev->devdata;
 280         struct acpi_video_device *video = acpi_driver_data(device);
 281         unsigned long long level;
 282         int offset;
 283
 284         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 285                 return -EINVAL;
 286         for (offset = 2; offset < video->brightness->count; offset++)
 287                 if (level == video->brightness->levels[offset]) {
 288                         *state = video->brightness->count - offset - 1;
 289                         return 0;
 290                 }
 291
 292         return -EINVAL;
 293 }
 294
 295 static int
 296 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 297 {
 298         struct acpi_device *device = cooling_dev->devdata;
 299         struct acpi_video_device *video = acpi_driver_data(device);
 300         int level;
 301
 302         if ( state >= video->brightness->count - 2)
 303                 return -EINVAL;
 304
 305         state = video->brightness->count - state;
 306         level = video->brightness->levels[state -1];
 307         return acpi_video_device_lcd_set_level(video, level);
 308 }
 309
 310 static const struct thermal_cooling_device_ops video_cooling_ops = {
 311         .get_max_state = video_get_max_state,
 312         .get_cur_state = video_get_cur_state,
 313         .set_cur_state = video_set_cur_state,
 314 };
 315
 316 /* --------------------------------------------------------------------------
 317                                Video Management
 318    -------------------------------------------------------------------------- */
 319
 320 static int
 321 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 322                                    union acpi_object **levels)
 323 {
 324         int status;
 325         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 326         union acpi_object *obj;
 327
 328
 329         *levels = NULL;
 330
 331         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 332         if (!ACPI_SUCCESS(status))
 333                 return status;
 334         obj = (union acpi_object *)buffer.pointer;
 335         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 336                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 337                 status = -EFAULT;
 338                 goto err;
 339         }
 340
 341         *levels = obj;
 342
 343         return 0;
 344
 345       err:
 346         kfree(buffer.pointer);
 347
 348         return status;
 349 }
 350
 351 static int
 352 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 353 {
 354         int status;
 355         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 356         struct acpi_object_list args = { 1, &arg0 };
 357         int state;
 358
 359         arg0.integer.value = level;
 360
 361         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 362                                       &args, NULL);
 363         if (ACPI_FAILURE(status)) {
 364                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 365                 return -EIO;
 366         }
 367
 368         device->brightness->curr = level;
 369         for (state = 2; state < device->brightness->count; state++)
 370                 if (level == device->brightness->levels[state]) {
 371                         if (device->backlight)
 372                                 device->backlight->props.brightness = state - 2;
 373                         return 0;
 374                 }
 375
 376         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 377         return -EINVAL;
 378 }
 379
 380 /*
 381  * For some buggy _BQC methods, we need to add a constant value to
 382  * the _BQC return value to get the actual current brightness level
 383  */
 384
 385 static int bqc_offset_aml_bug_workaround;
 386 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 387 {
 388         bqc_offset_aml_bug_workaround = 9;
 389         return 0;
 390 }
 391
 392 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
 393 {
 394         use_bios_initial_backlight = 0;
 395         return 0;
 396 }
 397
 398 static struct dmi_system_id video_dmi_table[] __initdata = {
 399         /*
 400          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 401          */
 402         {
 403          .callback = video_set_bqc_offset,
 404          .ident = "Acer Aspire 5720",
 405          .matches = {
 406                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 407                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 408                 },
 409         },
 410         {
 411          .callback = video_set_bqc_offset,
 412          .ident = "Acer Aspire 5710Z",
 413          .matches = {
 414                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 415                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 416                 },
 417         },
 418         {
 419          .callback = video_set_bqc_offset,
 420          .ident = "eMachines E510",
 421          .matches = {
 422                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 423                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 424                 },
 425         },
 426         {
 427          .callback = video_set_bqc_offset,
 428          .ident = "Acer Aspire 5315",
 429          .matches = {
 430                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 431                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 432                 },
 433         },
 434         {
 435          .callback = video_set_bqc_offset,
 436          .ident = "Acer Aspire 7720",
 437          .matches = {
 438                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 439                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 440                 },
 441         },
 442         {
 443          .callback = video_ignore_initial_backlight,
 444          .ident = "HP Folio 13-2000",
 445          .matches = {
 446                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 447                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 448                 },
 449         },
 450         {}
 451 };
 452
 453 static int
 454 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 455                                         unsigned long long *level, int init)
 456 {
 457         acpi_status status = AE_OK;
 458         int i;
 459
 460         if (device->cap._BQC || device->cap._BCQ) {
 461                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 462
 463                 status = acpi_evaluate_integer(device->dev->handle, buf,
 464                                                 NULL, level);
 465                 if (ACPI_SUCCESS(status)) {
 466                         if (device->brightness->flags._BQC_use_index) {
 467                                 if (device->brightness->flags._BCL_reversed)
 468                                         *level = device->brightness->count
 469                                                                  - 3 - (*level);
 470                                 *level = device->brightness->levels[*level + 2];
 471
 472                         }
 473                         *level += bqc_offset_aml_bug_workaround;
 474                         for (i = 2; i < device->brightness->count; i++)
 475                                 if (device->brightness->levels[i] == *level) {
 476                                         device->brightness->curr = *level;
 477                                         return 0;
 478                         }
 479                         if (!init) {
 480                                 /*
 481                                  * BQC returned an invalid level.
 482                                  * Stop using it.
 483                                  */
 484                                 ACPI_WARNING((AE_INFO,
 485                                               "%s returned an invalid level",
 486                                               buf));
 487                                 device->cap._BQC = device->cap._BCQ = 0;
 488                         }
 489                 } else {
 490                         /* Fixme:
 491                          * should we return an error or ignore this failure?
 492                          * dev->brightness->curr is a cached value which stores
 493                          * the correct current backlight level in most cases.
 494                          * ACPI video backlight still works w/ buggy _BQC.
 495                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 496                          */
 497                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 498                         device->cap._BQC = device->cap._BCQ = 0;
 499                 }
 500         }
 501
 502         *level = device->brightness->curr;
 503         return 0;
 504 }
 505
 506 static int
 507 acpi_video_device_EDID(struct acpi_video_device *device,
 508                        union acpi_object **edid, ssize_t length)
 509 {
 510         int status;
 511         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 512         union acpi_object *obj;
 513         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 514         struct acpi_object_list args = { 1, &arg0 };
 515
 516
 517         *edid = NULL;
 518
 519         if (!device)
 520                 return -ENODEV;
 521         if (length == 128)
 522                 arg0.integer.value = 1;
 523         else if (length == 256)
 524                 arg0.integer.value = 2;
 525         else
 526                 return -EINVAL;
 527
 528         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 529         if (ACPI_FAILURE(status))
 530                 return -ENODEV;
 531
 532         obj = buffer.pointer;
 533
 534         if (obj && obj->type == ACPI_TYPE_BUFFER)
 535                 *edid = obj;
 536         else {
 537                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 538                 status = -EFAULT;
 539                 kfree(obj);
 540         }
 541
 542         return status;
 543 }
 544
 545 /* bus */
 546
 547 /*
 548  *  Arg:
 549  *      video           : video bus device pointer
 550  *      bios_flag       :
 551  *              0.      The system BIOS should NOT automatically switch(toggle)
 552  *                      the active display output.
 553  *              1.      The system BIOS should automatically switch (toggle) the
 554  *                      active display output. No switch event.
 555  *              2.      The _DGS value should be locked.
 556  *              3.      The system BIOS should not automatically switch (toggle) the
 557  *                      active display output, but instead generate the display switch
 558  *                      event notify code.
 559  *      lcd_flag        :
 560  *              0.      The system BIOS should automatically control the brightness level
 561  *                      of the LCD when the power changes from AC to DC
 562  *              1.      The system BIOS should NOT automatically control the brightness
 563  *                      level of the LCD when the power changes from AC to DC.
 564  * Return Value:
 565  *              -1      wrong arg.
 566  */
 567
 568 static int
 569 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 570 {
 571         u64 status = 0;
 572         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 573         struct acpi_object_list args = { 1, &arg0 };
 574
 575
 576         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 577                 status = -1;
 578                 goto Failed;
 579         }
 580         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 581         video->dos_setting = arg0.integer.value;
 582         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 583
 584       Failed:
 585         return status;
 586 }
 587
 588 /*
 589  * Simple comparison function used to sort backlight levels.
 590  */
 591
 592 static int
 593 acpi_video_cmp_level(const void *a, const void *b)
 594 {
 595         return *(int *)a - *(int *)b;
 596 }
 597
 598 /*
 599  *  Arg:
 600  *      device  : video output device (LCD, CRT, ..)
 601  *
 602  *  Return Value:
 603  *      Maximum brightness level
 604  *
 605  *  Allocate and initialize device->brightness.
 606  */
 607
 608 static int
 609 acpi_video_init_brightness(struct acpi_video_device *device)
 610 {
 611         union acpi_object *obj = NULL;
 612         int i, max_level = 0, count = 0, level_ac_battery = 0;
 613         unsigned long long level, level_old;
 614         union acpi_object *o;
 615         struct acpi_video_device_brightness *br = NULL;
 616         int result = -EINVAL;
 617
 618         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 619                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 620                                                 "LCD brightness level\n"));
 621                 goto out;
 622         }
 623
 624         if (obj->package.count < 2)
 625                 goto out;
 626
 627         br = kzalloc(sizeof(*br), GFP_KERNEL);
 628         if (!br) {
 629                 printk(KERN_ERR "can't allocate memory\n");
 630                 result = -ENOMEM;
 631                 goto out;
 632         }
 633
 634         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 635                                 GFP_KERNEL);
 636         if (!br->levels) {
 637                 result = -ENOMEM;
 638                 goto out_free;
 639         }
 640
 641         for (i = 0; i < obj->package.count; i++) {
 642                 o = (union acpi_object *)&obj->package.elements[i];
 643                 if (o->type != ACPI_TYPE_INTEGER) {
 644                         printk(KERN_ERR PREFIX "Invalid data\n");
 645                         continue;
 646                 }
 647                 br->levels[count] = (u32) o->integer.value;
 648
 649                 if (br->levels[count] > max_level)
 650                         max_level = br->levels[count];
 651                 count++;
 652         }
 653
 654         /*
 655          * some buggy BIOS don't export the levels
 656          * when machine is on AC/Battery in _BCL package.
 657          * In this case, the first two elements in _BCL packages
 658          * are also supported brightness levels that OS should take care of.
 659          */
 660         for (i = 2; i < count; i++) {
 661                 if (br->levels[i] == br->levels[0])
 662                         level_ac_battery++;
 663                 if (br->levels[i] == br->levels[1])
 664                         level_ac_battery++;
 665         }
 666
 667         if (level_ac_battery < 2) {
 668                 level_ac_battery = 2 - level_ac_battery;
 669                 br->flags._BCL_no_ac_battery_levels = 1;
 670                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 671                         br->levels[i] = br->levels[i - level_ac_battery];
 672                 count += level_ac_battery;
 673         } else if (level_ac_battery > 2)
 674                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 675
 676         /* Check if the _BCL package is in a reversed order */
 677         if (max_level == br->levels[2]) {
 678                 br->flags._BCL_reversed = 1;
 679                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 680                         acpi_video_cmp_level, NULL);
 681         } else if (max_level != br->levels[count - 1])
 682                 ACPI_ERROR((AE_INFO,
 683                             "Found unordered _BCL package\n"));
 684
 685         br->count = count;
 686         device->brightness = br;
 687
 688         /* Check the input/output of _BQC/_BCL/_BCM */
 689         if ((max_level < 100) && (max_level <= (count - 2)))
 690                 br->flags._BCL_use_index = 1;
 691
 692         /*
 693          * _BCM is always consistent with _BCL,
 694          * at least for all the laptops we have ever seen.
 695          */
 696         br->flags._BCM_use_index = br->flags._BCL_use_index;
 697
 698         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 699         br->curr = level = max_level;
 700
 701         if (!device->cap._BQC)
 702                 goto set_level;
 703
 704         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 705         if (result)
 706                 goto out_free_levels;
 707
 708         /*
 709          * Set the level to maximum and check if _BQC uses indexed value
 710          */
 711         result = acpi_video_device_lcd_set_level(device, max_level);
 712         if (result)
 713                 goto out_free_levels;
 714
 715         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 716         if (result)
 717                 goto out_free_levels;
 718
 719         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 720
 721         if (!br->flags._BQC_use_index) {
 722                 /*
 723                  * Set the backlight to the initial state.
 724                  * On some buggy laptops, _BQC returns an uninitialized value
 725                  * when invoked for the first time, i.e. level_old is invalid.
 726                  * set the backlight to max_level in this case
 727                  */
 728                 if (use_bios_initial_backlight) {
 729                         for (i = 2; i < br->count; i++)
 730                                 if (level_old == br->levels[i])
 731                                         level = level_old;
 732                 }
 733                 goto set_level;
 734         }
 735
 736         if (br->flags._BCL_reversed)
 737                 level_old = (br->count - 1) - level_old;
 738         level = br->levels[level_old];
 739
 740 set_level:
 741         result = acpi_video_device_lcd_set_level(device, level);
 742         if (result)
 743                 goto out_free_levels;
 744
 745         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 746                           "found %d brightness levels\n", count - 2));
 747         kfree(obj);
 748         return result;
 749
 750 out_free_levels:
 751         kfree(br->levels);
 752 out_free:
 753         kfree(br);
 754 out:
 755         device->brightness = NULL;
 756         kfree(obj);
 757         return result;
 758 }
 759
 760 /*
 761  *  Arg:
 762  *      device  : video output device (LCD, CRT, ..)
 763  *
 764  *  Return Value:
 765  *      None
 766  *
 767  *  Find out all required AML methods defined under the output
 768  *  device.
 769  */
 770
 771 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 772 {
 773         acpi_handle h_dummy1;
 774
 775         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 776                 device->cap._ADR = 1;
 777         }
 778         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 779                 device->cap._BCL = 1;
 780         }
 781         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 782                 device->cap._BCM = 1;
 783         }
 784         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 785                 device->cap._BQC = 1;
 786         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 787                                 &h_dummy1))) {
 788                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 789                 device->cap._BCQ = 1;
 790         }
 791
 792         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 793                 device->cap._DDC = 1;
 794         }
 795
 796         if (acpi_video_backlight_support()) {
 797                 struct backlight_properties props;
 798                 struct pci_dev *pdev;
 799                 acpi_handle acpi_parent;
 800                 struct device *parent = NULL;
 801                 int result;
 802                 static int count = 0;
 803                 char *name;
 804
 805                 result = acpi_video_init_brightness(device);
 806                 if (result)
 807                         return;
 808                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 809                 if (!name)
 810                         return;
 811                 count++;
 812
 813                 acpi_get_parent(device->dev->handle, &acpi_parent);
 814
 815                 pdev = acpi_get_pci_dev(acpi_parent);
 816                 if (pdev) {
 817                         parent = &pdev->dev;
 818                         pci_dev_put(pdev);
 819                 }
 820
 821                 memset(&props, 0, sizeof(struct backlight_properties));
 822                 props.type = BACKLIGHT_FIRMWARE;
 823                 props.max_brightness = device->brightness->count - 3;
 824                 device->backlight = backlight_device_register(name,
 825                                                               parent,
 826                                                               device,
 827                                                               &acpi_backlight_ops,
 828                                                               &props);
 829                 kfree(name);
 830                 if (IS_ERR(device->backlight))
 831                         return;
 832
 833                 /*
 834                  * Save current brightness level in case we have to restore it
 835                  * before acpi_video_device_lcd_set_level() is called next time.
 836                  */
 837                 device->backlight->props.brightness =
 838                                 acpi_video_get_brightness(device->backlight);
 839
 840                 device->cooling_dev = thermal_cooling_device_register("LCD",
 841                                         device->dev, &video_cooling_ops);
 842                 if (IS_ERR(device->cooling_dev)) {
 843                         /*
 844                          * Set cooling_dev to NULL so we don't crash trying to
 845                          * free it.
 846                          * Also, why the hell we are returning early and
 847                          * not attempt to register video output if cooling
 848                          * device registration failed?
 849                          * -- dtor
 850                          */
 851                         device->cooling_dev = NULL;
 852                         return;
 853                 }
 854
 855                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 856                          device->cooling_dev->id);
 857                 result = sysfs_create_link(&device->dev->dev.kobj,
 858                                 &device->cooling_dev->device.kobj,
 859                                 "thermal_cooling");
 860                 if (result)
 861                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 862                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 863                                 &device->dev->dev.kobj, "device");
 864                 if (result)
 865                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 866
 867         }
 868 }
 869
 870 /*
 871  *  Arg:
 872  *      device  : video output device (VGA)
 873  *
 874  *  Return Value:
 875  *      None
 876  *
 877  *  Find out all required AML methods defined under the video bus device.
 878  */
 879
 880 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 881 {
 882         acpi_handle h_dummy1;
 883
 884         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 885                 video->cap._DOS = 1;
 886         }
 887         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 888                 video->cap._DOD = 1;
 889         }
 890         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 891                 video->cap._ROM = 1;
 892         }
 893         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 894                 video->cap._GPD = 1;
 895         }
 896         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 897                 video->cap._SPD = 1;
 898         }
 899         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 900                 video->cap._VPO = 1;
 901         }
 902 }
 903
 904 /*
 905  * Check whether the video bus device has required AML method to
 906  * support the desired features
 907  */
 908
 909 static int acpi_video_bus_check(struct acpi_video_bus *video)
 910 {
 911         acpi_status status = -ENOENT;
 912         struct pci_dev *dev;
 913
 914         if (!video)
 915                 return -EINVAL;
 916
 917         dev = acpi_get_pci_dev(video->device->handle);
 918         if (!dev)
 919                 return -ENODEV;
 920         pci_dev_put(dev);
 921
 922         /* Since there is no HID, CID and so on for VGA driver, we have
 923          * to check well known required nodes.
 924          */
 925
 926         /* Does this device support video switching? */
 927         if (video->cap._DOS || video->cap._DOD) {
 928                 if (!video->cap._DOS) {
 929                         printk(KERN_WARNING FW_BUG
 930                                 "ACPI(%s) defines _DOD but not _DOS\n",
 931                                 acpi_device_bid(video->device));
 932                 }
 933                 video->flags.multihead = 1;
 934                 status = 0;
 935         }
 936
 937         /* Does this device support retrieving a video ROM? */
 938         if (video->cap._ROM) {
 939                 video->flags.rom = 1;
 940                 status = 0;
 941         }
 942
 943         /* Does this device support configuring which video device to POST? */
 944         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 945                 video->flags.post = 1;
 946                 status = 0;
 947         }
 948
 949         return status;
 950 }
 951
 952 /* --------------------------------------------------------------------------
 953                                  Driver Interface
 954    -------------------------------------------------------------------------- */
 955
 956 /* device interface */
 957 static struct acpi_video_device_attrib*
 958 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 959 {
 960         struct acpi_video_enumerated_device *ids;
 961         int i;
 962
 963         for (i = 0; i < video->attached_count; i++) {
 964                 ids = &video->attached_array[i];
 965                 if ((ids->value.int_val & 0xffff) == device_id)
 966                         return &ids->value.attrib;
 967         }
 968
 969         return NULL;
 970 }
 971
 972 static int
 973 acpi_video_get_device_type(struct acpi_video_bus *video,
 974                            unsigned long device_id)
 975 {
 976         struct acpi_video_enumerated_device *ids;
 977         int i;
 978
 979         for (i = 0; i < video->attached_count; i++) {
 980                 ids = &video->attached_array[i];
 981                 if ((ids->value.int_val & 0xffff) == device_id)
 982                         return ids->value.int_val;
 983         }
 984
 985         return 0;
 986 }
 987
 988 static int
 989 acpi_video_bus_get_one_device(struct acpi_device *device,
 990                               struct acpi_video_bus *video)
 991 {
 992         unsigned long long device_id;
 993         int status, device_type;
 994         struct acpi_video_device *data;
 995         struct acpi_video_device_attrib* attribute;
 996
 997         if (!device || !video)
 998                 return -EINVAL;
 999
1000         status =
1001             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1002         if (ACPI_SUCCESS(status)) {
1003
1004                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1005                 if (!data)
1006                         return -ENOMEM;
1007
1008                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1009                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1010                 device->driver_data = data;
1011
1012                 data->device_id = device_id;
1013                 data->video = video;
1014                 data->dev = device;
1015
1016                 attribute = acpi_video_get_device_attr(video, device_id);
1017
1018                 if((attribute != NULL) && attribute->device_id_scheme) {
1019                         switch (attribute->display_type) {
1020                         case ACPI_VIDEO_DISPLAY_CRT:
1021                                 data->flags.crt = 1;
1022                                 break;
1023                         case ACPI_VIDEO_DISPLAY_TV:
1024                                 data->flags.tvout = 1;
1025                                 break;
1026                         case ACPI_VIDEO_DISPLAY_DVI:
1027                                 data->flags.dvi = 1;
1028                                 break;
1029                         case ACPI_VIDEO_DISPLAY_LCD:
1030                                 data->flags.lcd = 1;
1031                                 break;
1032                         default:
1033                                 data->flags.unknown = 1;
1034                                 break;
1035                         }
1036                         if(attribute->bios_can_detect)
1037                                 data->flags.bios = 1;
1038                 } else {
1039                         /* Check for legacy IDs */
1040                         device_type = acpi_video_get_device_type(video,
1041                                                                  device_id);
1042                         /* Ignore bits 16 and 18-20 */
1043                         switch (device_type & 0xffe2ffff) {
1044                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1045                                 data->flags.crt = 1;
1046                                 break;
1047                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1048                                 data->flags.lcd = 1;
1049                                 break;
1050                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1051                                 data->flags.tvout = 1;
1052                                 break;
1053                         default:
1054                                 data->flags.unknown = 1;
1055                         }
1056                 }
1057
1058                 acpi_video_device_bind(video, data);
1059                 acpi_video_device_find_cap(data);
1060
1061                 status = acpi_install_notify_handler(device->handle,
1062                                                      ACPI_DEVICE_NOTIFY,
1063                                                      acpi_video_device_notify,
1064                                                      data);
1065                 if (ACPI_FAILURE(status)) {
1066                         printk(KERN_ERR PREFIX
1067                                           "Error installing notify handler\n");
1068                         if(data->brightness)
1069                                 kfree(data->brightness->levels);
1070                         kfree(data->brightness);
1071                         kfree(data);
1072                         return -ENODEV;
1073                 }
1074
1075                 mutex_lock(&video->device_list_lock);
1076                 list_add_tail(&data->entry, &video->video_device_list);
1077                 mutex_unlock(&video->device_list_lock);
1078
1079                 return 0;
1080         }
1081
1082         return -ENOENT;
1083 }
1084
1085 /*
1086  *  Arg:
1087  *      video   : video bus device
1088  *
1089  *  Return:
1090  *      none
1091  *
1092  *  Enumerate the video device list of the video bus,
1093  *  bind the ids with the corresponding video devices
1094  *  under the video bus.
1095  */
1096
1097 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1098 {
1099         struct acpi_video_device *dev;
1100
1101         mutex_lock(&video->device_list_lock);
1102
1103         list_for_each_entry(dev, &video->video_device_list, entry)
1104                 acpi_video_device_bind(video, dev);
1105
1106         mutex_unlock(&video->device_list_lock);
1107 }
1108
1109 /*
1110  *  Arg:
1111  *      video   : video bus device
1112  *      device  : video output device under the video
1113  *              bus
1114  *
1115  *  Return:
1116  *      none
1117  *
1118  *  Bind the ids with the corresponding video devices
1119  *  under the video bus.
1120  */
1121
1122 static void
1123 acpi_video_device_bind(struct acpi_video_bus *video,
1124                        struct acpi_video_device *device)
1125 {
1126         struct acpi_video_enumerated_device *ids;
1127         int i;
1128
1129         for (i = 0; i < video->attached_count; i++) {
1130                 ids = &video->attached_array[i];
1131                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1132                         ids->bind_info = device;
1133                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1134                 }
1135         }
1136 }
1137
1138 /*
1139  *  Arg:
1140  *      video   : video bus device
1141  *
1142  *  Return:
1143  *      < 0     : error
1144  *
1145  *  Call _DOD to enumerate all devices attached to display adapter
1146  *
1147  */
1148
1149 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1150 {
1151         int status;
1152         int count;
1153         int i;
1154         struct acpi_video_enumerated_device *active_list;
1155         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1156         union acpi_object *dod = NULL;
1157         union acpi_object *obj;
1158
1159         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1160         if (!ACPI_SUCCESS(status)) {
1161                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1162                 return status;
1163         }
1164
1165         dod = buffer.pointer;
1166         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1167                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1168                 status = -EFAULT;
1169                 goto out;
1170         }
1171
1172         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1173                           dod->package.count));
1174
1175         active_list = kcalloc(1 + dod->package.count,
1176                               sizeof(struct acpi_video_enumerated_device),
1177                               GFP_KERNEL);
1178         if (!active_list) {
1179                 status = -ENOMEM;
1180                 goto out;
1181         }
1182
1183         count = 0;
1184         for (i = 0; i < dod->package.count; i++) {
1185                 obj = &dod->package.elements[i];
1186
1187                 if (obj->type != ACPI_TYPE_INTEGER) {
1188                         printk(KERN_ERR PREFIX
1189                                 "Invalid _DOD data in element %d\n", i);
1190                         continue;
1191                 }
1192
1193                 active_list[count].value.int_val = obj->integer.value;
1194                 active_list[count].bind_info = NULL;
1195                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1196                                   (int)obj->integer.value));
1197                 count++;
1198         }
1199
1200         kfree(video->attached_array);
1201
1202         video->attached_array = active_list;
1203         video->attached_count = count;
1204
1205  out:
1206         kfree(buffer.pointer);
1207         return status;
1208 }
1209
1210 static int
1211 acpi_video_get_next_level(struct acpi_video_device *device,
1212                           u32 level_current, u32 event)
1213 {
1214         int min, max, min_above, max_below, i, l, delta = 255;
1215         max = max_below = 0;
1216         min = min_above = 255;
1217         /* Find closest level to level_current */
1218         for (i = 2; i < device->brightness->count; i++) {
1219                 l = device->brightness->levels[i];
1220                 if (abs(l - level_current) < abs(delta)) {
1221                         delta = l - level_current;
1222                         if (!delta)
1223                                 break;
1224                 }
1225         }
1226         /* Ajust level_current to closest available level */
1227         level_current += delta;
1228         for (i = 2; i < device->brightness->count; i++) {
1229                 l = device->brightness->levels[i];
1230                 if (l < min)
1231                         min = l;
1232                 if (l > max)
1233                         max = l;
1234                 if (l < min_above && l > level_current)
1235                         min_above = l;
1236                 if (l > max_below && l < level_current)
1237                         max_below = l;
1238         }
1239
1240         switch (event) {
1241         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1242                 return (level_current < max) ? min_above : min;
1243         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1244                 return (level_current < max) ? min_above : max;
1245         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1246                 return (level_current > min) ? max_below : min;
1247         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1248         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1249                 return 0;
1250         default:
1251                 return level_current;
1252         }
1253 }
1254
1255 static int
1256 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1257 {
1258         unsigned long long level_current, level_next;
1259         int result = -EINVAL;
1260
1261         /* no warning message if acpi_backlight=vendor is used */
1262         if (!acpi_video_backlight_support())
1263                 return 0;
1264
1265         if (!device->brightness)
1266                 goto out;
1267
1268         result = acpi_video_device_lcd_get_level_current(device,
1269                                                          &level_current, 0);
1270         if (result)
1271                 goto out;
1272
1273         level_next = acpi_video_get_next_level(device, level_current, event);
1274
1275         result = acpi_video_device_lcd_set_level(device, level_next);
1276
1277         if (!result)
1278                 backlight_force_update(device->backlight,
1279                                        BACKLIGHT_UPDATE_HOTKEY);
1280
1281 out:
1282         if (result)
1283                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1284
1285         return result;
1286 }
1287
1288 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1289                         void **edid)
1290 {
1291         struct acpi_video_bus *video;
1292         struct acpi_video_device *video_device;
1293         union acpi_object *buffer = NULL;
1294         acpi_status status;
1295         int i, length;
1296
1297         if (!device || !acpi_driver_data(device))
1298                 return -EINVAL;
1299
1300         video = acpi_driver_data(device);
1301
1302         for (i = 0; i < video->attached_count; i++) {
1303                 video_device = video->attached_array[i].bind_info;
1304                 length = 256;
1305
1306                 if (!video_device)
1307                         continue;
1308
1309                 if (!video_device->cap._DDC)
1310                         continue;
1311
1312                 if (type) {
1313                         switch (type) {
1314                         case ACPI_VIDEO_DISPLAY_CRT:
1315                                 if (!video_device->flags.crt)
1316                                         continue;
1317                                 break;
1318                         case ACPI_VIDEO_DISPLAY_TV:
1319                                 if (!video_device->flags.tvout)
1320                                         continue;
1321                                 break;
1322                         case ACPI_VIDEO_DISPLAY_DVI:
1323                                 if (!video_device->flags.dvi)
1324                                         continue;
1325                                 break;
1326                         case ACPI_VIDEO_DISPLAY_LCD:
1327                                 if (!video_device->flags.lcd)
1328                                         continue;
1329                                 break;
1330                         }
1331                 } else if (video_device->device_id != device_id) {
1332                         continue;
1333                 }
1334
1335                 status = acpi_video_device_EDID(video_device, &buffer, length);
1336
1337                 if (ACPI_FAILURE(status) || !buffer ||
1338                     buffer->type != ACPI_TYPE_BUFFER) {
1339                         length = 128;
1340                         status = acpi_video_device_EDID(video_device, &buffer,
1341                                                         length);
1342                         if (ACPI_FAILURE(status) || !buffer ||
1343                             buffer->type != ACPI_TYPE_BUFFER) {
1344                                 continue;
1345                         }
1346                 }
1347
1348                 *edid = buffer->buffer.pointer;
1349                 return length;
1350         }
1351
1352         return -ENODEV;
1353 }
1354 EXPORT_SYMBOL(acpi_video_get_edid);
1355
1356 static int
1357 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1358                            struct acpi_device *device)
1359 {
1360         int status = 0;
1361         struct acpi_device *dev;
1362
1363         acpi_video_device_enumerate(video);
1364
1365         list_for_each_entry(dev, &device->children, node) {
1366
1367                 status = acpi_video_bus_get_one_device(dev, video);
1368                 if (ACPI_FAILURE(status)) {
1369                         printk(KERN_WARNING PREFIX
1370                                         "Can't attach device\n");
1371                         continue;
1372                 }
1373         }
1374         return status;
1375 }
1376
1377 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1378 {
1379         acpi_status status;
1380
1381         if (!device || !device->video)
1382                 return -ENOENT;
1383
1384         status = acpi_remove_notify_handler(device->dev->handle,
1385                                             ACPI_DEVICE_NOTIFY,
1386                                             acpi_video_device_notify);
1387         if (ACPI_FAILURE(status)) {
1388                 printk(KERN_WARNING PREFIX
1389                        "Can't remove video notify handler\n");
1390         }
1391         if (device->backlight) {
1392                 backlight_device_unregister(device->backlight);
1393                 device->backlight = NULL;
1394         }
1395         if (device->cooling_dev) {
1396                 sysfs_remove_link(&device->dev->dev.kobj,
1397                                   "thermal_cooling");
1398                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1399                                   "device");
1400                 thermal_cooling_device_unregister(device->cooling_dev);
1401                 device->cooling_dev = NULL;
1402         }
1403
1404         return 0;
1405 }
1406
1407 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1408 {
1409         int status;
1410         struct acpi_video_device *dev, *next;
1411
1412         mutex_lock(&video->device_list_lock);
1413
1414         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1415
1416                 status = acpi_video_bus_put_one_device(dev);
1417                 if (ACPI_FAILURE(status))
1418                         printk(KERN_WARNING PREFIX
1419                                "hhuuhhuu bug in acpi video driver.\n");
1420
1421                 if (dev->brightness) {
1422                         kfree(dev->brightness->levels);
1423                         kfree(dev->brightness);
1424                 }
1425                 list_del(&dev->entry);
1426                 kfree(dev);
1427         }
1428
1429         mutex_unlock(&video->device_list_lock);
1430
1431         return 0;
1432 }
1433
1434 /* acpi_video interface */
1435
1436 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1437 {
1438         return acpi_video_bus_DOS(video, 0, 0);
1439 }
1440
1441 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1442 {
1443         return acpi_video_bus_DOS(video, 0, 1);
1444 }
1445
1446 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1447 {
1448         struct acpi_video_bus *video = acpi_driver_data(device);
1449         struct input_dev *input;
1450         int keycode = 0;
1451
1452         if (!video)
1453                 return;
1454
1455         input = video->input;
1456
1457         switch (event) {
1458         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1459                                          * most likely via hotkey. */
1460                 acpi_bus_generate_proc_event(device, event, 0);
1461                 if (!acpi_notifier_call_chain(device, event, 0))
1462                         keycode = KEY_SWITCHVIDEOMODE;
1463                 break;
1464
1465         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1466                                          * connector. */
1467                 acpi_video_device_enumerate(video);
1468                 acpi_video_device_rebind(video);
1469                 acpi_bus_generate_proc_event(device, event, 0);
1470                 keycode = KEY_SWITCHVIDEOMODE;
1471                 break;
1472
1473         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1474                 acpi_bus_generate_proc_event(device, event, 0);
1475                 keycode = KEY_SWITCHVIDEOMODE;
1476                 break;
1477         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1478                 acpi_bus_generate_proc_event(device, event, 0);
1479                 keycode = KEY_VIDEO_NEXT;
1480                 break;
1481         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1482                 acpi_bus_generate_proc_event(device, event, 0);
1483                 keycode = KEY_VIDEO_PREV;
1484                 break;
1485
1486         default:
1487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1488                                   "Unsupported event [0x%x]\n", event));
1489                 break;
1490         }
1491
1492         if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1493                 acpi_notifier_call_chain(device, event, 0);
1494
1495         if (keycode) {
1496                 input_report_key(input, keycode, 1);
1497                 input_sync(input);
1498                 input_report_key(input, keycode, 0);
1499                 input_sync(input);
1500         }
1501
1502         return;
1503 }
1504
1505 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1506 {
1507         struct acpi_video_device *video_device = data;
1508         struct acpi_device *device = NULL;
1509         struct acpi_video_bus *bus;
1510         struct input_dev *input;
1511         int keycode = 0;
1512
1513         if (!video_device)
1514                 return;
1515
1516         device = video_device->dev;
1517         bus = video_device->video;
1518         input = bus->input;
1519
1520         switch (event) {
1521         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1522                 if (brightness_switch_enabled)
1523                         acpi_video_switch_brightness(video_device, event);
1524                 acpi_bus_generate_proc_event(device, event, 0);
1525                 keycode = KEY_BRIGHTNESS_CYCLE;
1526                 break;
1527         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1528                 if (brightness_switch_enabled)
1529                         acpi_video_switch_brightness(video_device, event);
1530                 acpi_bus_generate_proc_event(device, event, 0);
1531                 keycode = KEY_BRIGHTNESSUP;
1532                 break;
1533         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1534                 if (brightness_switch_enabled)
1535                         acpi_video_switch_brightness(video_device, event);
1536                 acpi_bus_generate_proc_event(device, event, 0);
1537                 keycode = KEY_BRIGHTNESSDOWN;
1538                 break;
1539         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1540                 if (brightness_switch_enabled)
1541                         acpi_video_switch_brightness(video_device, event);
1542                 acpi_bus_generate_proc_event(device, event, 0);
1543                 keycode = KEY_BRIGHTNESS_ZERO;
1544                 break;
1545         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1546                 if (brightness_switch_enabled)
1547                         acpi_video_switch_brightness(video_device, event);
1548                 acpi_bus_generate_proc_event(device, event, 0);
1549                 keycode = KEY_DISPLAY_OFF;
1550                 break;
1551         default:
1552                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1553                                   "Unsupported event [0x%x]\n", event));
1554                 break;
1555         }
1556
1557         acpi_notifier_call_chain(device, event, 0);
1558
1559         if (keycode) {
1560                 input_report_key(input, keycode, 1);
1561                 input_sync(input);
1562                 input_report_key(input, keycode, 0);
1563                 input_sync(input);
1564         }
1565
1566         return;
1567 }
1568
1569 static int acpi_video_resume(struct notifier_block *nb,
1570                                 unsigned long val, void *ign)
1571 {
1572         struct acpi_video_bus *video;
1573         struct acpi_video_device *video_device;
1574         int i;
1575
1576         switch (val) {
1577         case PM_HIBERNATION_PREPARE:
1578         case PM_SUSPEND_PREPARE:
1579         case PM_RESTORE_PREPARE:
1580                 return NOTIFY_DONE;
1581         }
1582
1583         video = container_of(nb, struct acpi_video_bus, pm_nb);
1584
1585         dev_info(&video->device->dev, "Restoring backlight state\n");
1586
1587         for (i = 0; i < video->attached_count; i++) {
1588                 video_device = video->attached_array[i].bind_info;
1589                 if (video_device && video_device->backlight)
1590                         acpi_video_set_brightness(video_device->backlight);
1591         }
1592
1593         return NOTIFY_OK;
1594 }
1595
1596 static acpi_status
1597 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1598                         void **return_value)
1599 {
1600         struct acpi_device *device = context;
1601         struct acpi_device *sibling;
1602         int result;
1603
1604         if (handle == device->handle)
1605                 return AE_CTRL_TERMINATE;
1606
1607         result = acpi_bus_get_device(handle, &sibling);
1608         if (result)
1609                 return AE_OK;
1610
1611         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1612                         return AE_ALREADY_EXISTS;
1613
1614         return AE_OK;
1615 }
1616
1617 static int instance;
1618
1619 static int acpi_video_bus_add(struct acpi_device *device)
1620 {
1621         struct acpi_video_bus *video;
1622         struct input_dev *input;
1623         int error;
1624         acpi_status status;
1625
1626         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1627                                 device->parent->handle, 1,
1628                                 acpi_video_bus_match, NULL,
1629                                 device, NULL);
1630         if (status == AE_ALREADY_EXISTS) {
1631                 printk(KERN_WARNING FW_BUG
1632                         "Duplicate ACPI video bus devices for the"
1633                         " same VGA controller, please try module "
1634                         "parameter \"video.allow_duplicates=1\""
1635                         "if the current driver doesn't work.\n");
1636                 if (!allow_duplicates)
1637                         return -ENODEV;
1638         }
1639
1640         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1641         if (!video)
1642                 return -ENOMEM;
1643
1644         /* a hack to fix the duplicate name "VID" problem on T61 */
1645         if (!strcmp(device->pnp.bus_id, "VID")) {
1646                 if (instance)
1647                         device->pnp.bus_id[3] = '0' + instance;
1648                 instance ++;
1649         }
1650         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1651         if (!strcmp(device->pnp.bus_id, "VGA")) {
1652                 if (instance)
1653                         device->pnp.bus_id[3] = '0' + instance;
1654                 instance++;
1655         }
1656
1657         video->device = device;
1658         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1659         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1660         device->driver_data = video;
1661
1662         acpi_video_bus_find_cap(video);
1663         error = acpi_video_bus_check(video);
1664         if (error)
1665                 goto err_free_video;
1666
1667         mutex_init(&video->device_list_lock);
1668         INIT_LIST_HEAD(&video->video_device_list);
1669
1670         acpi_video_bus_get_devices(video, device);
1671         acpi_video_bus_start_devices(video);
1672
1673         video->input = input = input_allocate_device();
1674         if (!input) {
1675                 error = -ENOMEM;
1676                 goto err_stop_video;
1677         }
1678
1679         snprintf(video->phys, sizeof(video->phys),
1680                 "%s/video/input0", acpi_device_hid(video->device));
1681
1682         input->name = acpi_device_name(video->device);
1683         input->phys = video->phys;
1684         input->id.bustype = BUS_HOST;
1685         input->id.product = 0x06;
1686         input->dev.parent = &device->dev;
1687         input->evbit[0] = BIT(EV_KEY);
1688         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1689         set_bit(KEY_VIDEO_NEXT, input->keybit);
1690         set_bit(KEY_VIDEO_PREV, input->keybit);
1691         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1692         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1693         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1694         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1695         set_bit(KEY_DISPLAY_OFF, input->keybit);
1696
1697         error = input_register_device(input);
1698         if (error)
1699                 goto err_free_input_dev;
1700
1701         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1702                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1703                video->flags.multihead ? "yes" : "no",
1704                video->flags.rom ? "yes" : "no",
1705                video->flags.post ? "yes" : "no");
1706
1707         video->pm_nb.notifier_call = acpi_video_resume;
1708         video->pm_nb.priority = 0;
1709         register_pm_notifier(&video->pm_nb);
1710
1711         return 0;
1712
1713  err_free_input_dev:
1714         input_free_device(input);
1715  err_stop_video:
1716         acpi_video_bus_stop_devices(video);
1717         acpi_video_bus_put_devices(video);
1718         kfree(video->attached_array);
1719  err_free_video:
1720         kfree(video);
1721         device->driver_data = NULL;
1722
1723         return error;
1724 }
1725
1726 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1727 {
1728         struct acpi_video_bus *video = NULL;
1729
1730
1731         if (!device || !acpi_driver_data(device))
1732                 return -EINVAL;
1733
1734         video = acpi_driver_data(device);
1735
1736         unregister_pm_notifier(&video->pm_nb);
1737
1738         acpi_video_bus_stop_devices(video);
1739         acpi_video_bus_put_devices(video);
1740
1741         input_unregister_device(video->input);
1742         kfree(video->attached_array);
1743         kfree(video);
1744
1745         return 0;
1746 }
1747
1748 static int __init intel_opregion_present(void)
1749 {
1750 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1751         struct pci_dev *dev = NULL;
1752         u32 address;
1753
1754         for_each_pci_dev(dev) {
1755                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1756                         continue;
1757                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1758                         continue;
1759                 pci_read_config_dword(dev, 0xfc, &address);
1760                 if (!address)
1761                         continue;
1762                 return 1;
1763         }
1764 #endif
1765         return 0;
1766 }
1767
1768 int acpi_video_register(void)
1769 {
1770         int result = 0;
1771         if (register_count) {
1772                 /*
1773                  * if the function of acpi_video_register is already called,
1774                  * don't register the acpi_vide_bus again and return no error.
1775                  */
1776                 return 0;
1777         }
1778
1779         result = acpi_bus_register_driver(&acpi_video_bus);
1780         if (result < 0)
1781                 return -ENODEV;
1782
1783         /*
1784          * When the acpi_video_bus is loaded successfully, increase
1785          * the counter reference.
1786          */
1787         register_count = 1;
1788
1789         return 0;
1790 }
1791 EXPORT_SYMBOL(acpi_video_register);
1792
1793 void acpi_video_unregister(void)
1794 {
1795         if (!register_count) {
1796                 /*
1797                  * If the acpi video bus is already unloaded, don't
1798                  * unload it again and return directly.
1799                  */
1800                 return;
1801         }
1802         acpi_bus_unregister_driver(&acpi_video_bus);
1803
1804         register_count = 0;
1805
1806         return;
1807 }
1808 EXPORT_SYMBOL(acpi_video_unregister);
1809
1810 /*
1811  * This is kind of nasty. Hardware using Intel chipsets may require
1812  * the video opregion code to be run first in order to initialise
1813  * state before any ACPI video calls are made. To handle this we defer
1814  * registration of the video class until the opregion code has run.
1815  */
1816
1817 static int __init acpi_video_init(void)
1818 {
1819         dmi_check_system(video_dmi_table);
1820
1821         if (intel_opregion_present())
1822                 return 0;
1823
1824         return acpi_video_register();
1825 }
1826
1827 static void __exit acpi_video_exit(void)
1828 {
1829         acpi_video_unregister();
1830
1831         return;
1832 }
1833
1834 module_init(acpi_video_init);
1835 module_exit(acpi_video_exit);