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 bool 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 bool 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 bool 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);
  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, bool raw);
 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, false))
 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, false))
 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          .callback = video_ignore_initial_backlight,
 452          .ident = "HP Pavilion dm4",
 453          .matches = {
 454                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 455                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 456                 },
 457         },
 458         {}
 459 };
 460
 461 static unsigned long long
 462 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 463                               unsigned long long bqc_value)
 464 {
 465         unsigned long long level;
 466
 467         if (device->brightness->flags._BQC_use_index) {
 468                 /*
 469                  * _BQC returns an index that doesn't account for
 470                  * the first 2 items with special meaning, so we need
 471                  * to compensate for that by offsetting ourselves
 472                  */
 473                 if (device->brightness->flags._BCL_reversed)
 474                         bqc_value = device->brightness->count - 3 - bqc_value;
 475
 476                 level = device->brightness->levels[bqc_value + 2];
 477         } else {
 478                 level = bqc_value;
 479         }
 480
 481         level += bqc_offset_aml_bug_workaround;
 482
 483         return level;
 484 }
 485
 486 static int
 487 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 488                                         unsigned long long *level, bool raw)
 489 {
 490         acpi_status status = AE_OK;
 491         int i;
 492
 493         if (device->cap._BQC || device->cap._BCQ) {
 494                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 495
 496                 status = acpi_evaluate_integer(device->dev->handle, buf,
 497                                                 NULL, level);
 498                 if (ACPI_SUCCESS(status)) {
 499                         if (raw) {
 500                                 /*
 501                                  * Caller has indicated he wants the raw
 502                                  * value returned by _BQC, so don't furtherly
 503                                  * mess with the value.
 504                                  */
 505                                 return 0;
 506                         }
 507
 508                         *level = acpi_video_bqc_value_to_level(device, *level);
 509
 510                         for (i = 2; i < device->brightness->count; i++)
 511                                 if (device->brightness->levels[i] == *level) {
 512                                         device->brightness->curr = *level;
 513                                         return 0;
 514                         }
 515                         /*
 516                          * BQC returned an invalid level.
 517                          * Stop using it.
 518                          */
 519                         ACPI_WARNING((AE_INFO,
 520                                       "%s returned an invalid level",
 521                                       buf));
 522                         device->cap._BQC = device->cap._BCQ = 0;
 523                 } else {
 524                         /* Fixme:
 525                          * should we return an error or ignore this failure?
 526                          * dev->brightness->curr is a cached value which stores
 527                          * the correct current backlight level in most cases.
 528                          * ACPI video backlight still works w/ buggy _BQC.
 529                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 530                          */
 531                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 532                         device->cap._BQC = device->cap._BCQ = 0;
 533                 }
 534         }
 535
 536         *level = device->brightness->curr;
 537         return 0;
 538 }
 539
 540 static int
 541 acpi_video_device_EDID(struct acpi_video_device *device,
 542                        union acpi_object **edid, ssize_t length)
 543 {
 544         int status;
 545         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 546         union acpi_object *obj;
 547         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 548         struct acpi_object_list args = { 1, &arg0 };
 549
 550
 551         *edid = NULL;
 552
 553         if (!device)
 554                 return -ENODEV;
 555         if (length == 128)
 556                 arg0.integer.value = 1;
 557         else if (length == 256)
 558                 arg0.integer.value = 2;
 559         else
 560                 return -EINVAL;
 561
 562         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 563         if (ACPI_FAILURE(status))
 564                 return -ENODEV;
 565
 566         obj = buffer.pointer;
 567
 568         if (obj && obj->type == ACPI_TYPE_BUFFER)
 569                 *edid = obj;
 570         else {
 571                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 572                 status = -EFAULT;
 573                 kfree(obj);
 574         }
 575
 576         return status;
 577 }
 578
 579 /* bus */
 580
 581 /*
 582  *  Arg:
 583  *      video           : video bus device pointer
 584  *      bios_flag       :
 585  *              0.      The system BIOS should NOT automatically switch(toggle)
 586  *                      the active display output.
 587  *              1.      The system BIOS should automatically switch (toggle) the
 588  *                      active display output. No switch event.
 589  *              2.      The _DGS value should be locked.
 590  *              3.      The system BIOS should not automatically switch (toggle) the
 591  *                      active display output, but instead generate the display switch
 592  *                      event notify code.
 593  *      lcd_flag        :
 594  *              0.      The system BIOS should automatically control the brightness level
 595  *                      of the LCD when the power changes from AC to DC
 596  *              1.      The system BIOS should NOT automatically control the brightness
 597  *                      level of the LCD when the power changes from AC to DC.
 598  * Return Value:
 599  *              -EINVAL wrong arg.
 600  */
 601
 602 static int
 603 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 604 {
 605         acpi_status status;
 606         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 607         struct acpi_object_list args = { 1, &arg0 };
 608
 609         if (!video->cap._DOS)
 610                 return 0;
 611
 612         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 613                 return -EINVAL;
 614         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 615         video->dos_setting = arg0.integer.value;
 616         status = acpi_evaluate_object(video->device->handle, "_DOS",
 617                 &args, NULL);
 618         if (ACPI_FAILURE(status))
 619                 return -EIO;
 620
 621         return 0;
 622 }
 623
 624 /*
 625  * Simple comparison function used to sort backlight levels.
 626  */
 627
 628 static int
 629 acpi_video_cmp_level(const void *a, const void *b)
 630 {
 631         return *(int *)a - *(int *)b;
 632 }
 633
 634 /*
 635  *  Arg:
 636  *      device  : video output device (LCD, CRT, ..)
 637  *
 638  *  Return Value:
 639  *      Maximum brightness level
 640  *
 641  *  Allocate and initialize device->brightness.
 642  */
 643
 644 static int
 645 acpi_video_init_brightness(struct acpi_video_device *device)
 646 {
 647         union acpi_object *obj = NULL;
 648         int i, max_level = 0, count = 0, level_ac_battery = 0;
 649         unsigned long long level, level_old;
 650         union acpi_object *o;
 651         struct acpi_video_device_brightness *br = NULL;
 652         int result = -EINVAL;
 653
 654         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 655                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 656                                                 "LCD brightness level\n"));
 657                 goto out;
 658         }
 659
 660         if (obj->package.count < 2)
 661                 goto out;
 662
 663         br = kzalloc(sizeof(*br), GFP_KERNEL);
 664         if (!br) {
 665                 printk(KERN_ERR "can't allocate memory\n");
 666                 result = -ENOMEM;
 667                 goto out;
 668         }
 669
 670         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 671                                 GFP_KERNEL);
 672         if (!br->levels) {
 673                 result = -ENOMEM;
 674                 goto out_free;
 675         }
 676
 677         for (i = 0; i < obj->package.count; i++) {
 678                 o = (union acpi_object *)&obj->package.elements[i];
 679                 if (o->type != ACPI_TYPE_INTEGER) {
 680                         printk(KERN_ERR PREFIX "Invalid data\n");
 681                         continue;
 682                 }
 683                 br->levels[count] = (u32) o->integer.value;
 684
 685                 if (br->levels[count] > max_level)
 686                         max_level = br->levels[count];
 687                 count++;
 688         }
 689
 690         /*
 691          * some buggy BIOS don't export the levels
 692          * when machine is on AC/Battery in _BCL package.
 693          * In this case, the first two elements in _BCL packages
 694          * are also supported brightness levels that OS should take care of.
 695          */
 696         for (i = 2; i < count; i++) {
 697                 if (br->levels[i] == br->levels[0])
 698                         level_ac_battery++;
 699                 if (br->levels[i] == br->levels[1])
 700                         level_ac_battery++;
 701         }
 702
 703         if (level_ac_battery < 2) {
 704                 level_ac_battery = 2 - level_ac_battery;
 705                 br->flags._BCL_no_ac_battery_levels = 1;
 706                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 707                         br->levels[i] = br->levels[i - level_ac_battery];
 708                 count += level_ac_battery;
 709         } else if (level_ac_battery > 2)
 710                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 711
 712         /* Check if the _BCL package is in a reversed order */
 713         if (max_level == br->levels[2]) {
 714                 br->flags._BCL_reversed = 1;
 715                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 716                         acpi_video_cmp_level, NULL);
 717         } else if (max_level != br->levels[count - 1])
 718                 ACPI_ERROR((AE_INFO,
 719                             "Found unordered _BCL package"));
 720
 721         br->count = count;
 722         device->brightness = br;
 723
 724         /* Check the input/output of _BQC/_BCL/_BCM */
 725         if ((max_level < 100) && (max_level <= (count - 2)))
 726                 br->flags._BCL_use_index = 1;
 727
 728         /*
 729          * _BCM is always consistent with _BCL,
 730          * at least for all the laptops we have ever seen.
 731          */
 732         br->flags._BCM_use_index = br->flags._BCL_use_index;
 733
 734         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 735         br->curr = level = max_level;
 736
 737         if (!device->cap._BQC)
 738                 goto set_level;
 739
 740         result = acpi_video_device_lcd_get_level_current(device,
 741                                                          &level_old, true);
 742         if (result)
 743                 goto out_free_levels;
 744
 745         /*
 746          * Set the level to maximum and check if _BQC uses indexed value
 747          */
 748         result = acpi_video_device_lcd_set_level(device, max_level);
 749         if (result)
 750                 goto out_free_levels;
 751
 752         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 753         if (result)
 754                 goto out_free_levels;
 755
 756         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 757
 758         if (use_bios_initial_backlight) {
 759                 level = acpi_video_bqc_value_to_level(device, level_old);
 760                 /*
 761                  * On some buggy laptops, _BQC returns an uninitialized
 762                  * value when invoked for the first time, i.e.
 763                  * level_old is invalid (no matter whether it's a level
 764                  * or an index). Set the backlight to max_level in this case.
 765                  */
 766                 for (i = 2; i < br->count; i++)
 767                         if (level_old == br->levels[i])
 768                                 break;
 769                 if (i == br->count)
 770                         level = max_level;
 771         }
 772
 773 set_level:
 774         result = acpi_video_device_lcd_set_level(device, level);
 775         if (result)
 776                 goto out_free_levels;
 777
 778         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 779                           "found %d brightness levels\n", count - 2));
 780         kfree(obj);
 781         return result;
 782
 783 out_free_levels:
 784         kfree(br->levels);
 785 out_free:
 786         kfree(br);
 787 out:
 788         device->brightness = NULL;
 789         kfree(obj);
 790         return result;
 791 }
 792
 793 /*
 794  *  Arg:
 795  *      device  : video output device (LCD, CRT, ..)
 796  *
 797  *  Return Value:
 798  *      None
 799  *
 800  *  Find out all required AML methods defined under the output
 801  *  device.
 802  */
 803
 804 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 805 {
 806         acpi_handle h_dummy1;
 807
 808         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 809                 device->cap._ADR = 1;
 810         }
 811         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 812                 device->cap._BCL = 1;
 813         }
 814         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 815                 device->cap._BCM = 1;
 816         }
 817         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 818                 device->cap._BQC = 1;
 819         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 820                                 &h_dummy1))) {
 821                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 822                 device->cap._BCQ = 1;
 823         }
 824
 825         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 826                 device->cap._DDC = 1;
 827         }
 828
 829         if (acpi_video_backlight_support()) {
 830                 struct backlight_properties props;
 831                 struct pci_dev *pdev;
 832                 acpi_handle acpi_parent;
 833                 struct device *parent = NULL;
 834                 int result;
 835                 static int count = 0;
 836                 char *name;
 837
 838                 result = acpi_video_init_brightness(device);
 839                 if (result)
 840                         return;
 841                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 842                 if (!name)
 843                         return;
 844                 count++;
 845
 846                 acpi_get_parent(device->dev->handle, &acpi_parent);
 847
 848                 pdev = acpi_get_pci_dev(acpi_parent);
 849                 if (pdev) {
 850                         parent = &pdev->dev;
 851                         pci_dev_put(pdev);
 852                 }
 853
 854                 memset(&props, 0, sizeof(struct backlight_properties));
 855                 props.type = BACKLIGHT_FIRMWARE;
 856                 props.max_brightness = device->brightness->count - 3;
 857                 device->backlight = backlight_device_register(name,
 858                                                               parent,
 859                                                               device,
 860                                                               &acpi_backlight_ops,
 861                                                               &props);
 862                 kfree(name);
 863                 if (IS_ERR(device->backlight))
 864                         return;
 865
 866                 /*
 867                  * Save current brightness level in case we have to restore it
 868                  * before acpi_video_device_lcd_set_level() is called next time.
 869                  */
 870                 device->backlight->props.brightness =
 871                                 acpi_video_get_brightness(device->backlight);
 872
 873                 device->cooling_dev = thermal_cooling_device_register("LCD",
 874                                         device->dev, &video_cooling_ops);
 875                 if (IS_ERR(device->cooling_dev)) {
 876                         /*
 877                          * Set cooling_dev to NULL so we don't crash trying to
 878                          * free it.
 879                          * Also, why the hell we are returning early and
 880                          * not attempt to register video output if cooling
 881                          * device registration failed?
 882                          * -- dtor
 883                          */
 884                         device->cooling_dev = NULL;
 885                         return;
 886                 }
 887
 888                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 889                          device->cooling_dev->id);
 890                 result = sysfs_create_link(&device->dev->dev.kobj,
 891                                 &device->cooling_dev->device.kobj,
 892                                 "thermal_cooling");
 893                 if (result)
 894                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 895                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 896                                 &device->dev->dev.kobj, "device");
 897                 if (result)
 898                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 899
 900         }
 901 }
 902
 903 /*
 904  *  Arg:
 905  *      device  : video output device (VGA)
 906  *
 907  *  Return Value:
 908  *      None
 909  *
 910  *  Find out all required AML methods defined under the video bus device.
 911  */
 912
 913 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 914 {
 915         acpi_handle h_dummy1;
 916
 917         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 918                 video->cap._DOS = 1;
 919         }
 920         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 921                 video->cap._DOD = 1;
 922         }
 923         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 924                 video->cap._ROM = 1;
 925         }
 926         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 927                 video->cap._GPD = 1;
 928         }
 929         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 930                 video->cap._SPD = 1;
 931         }
 932         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 933                 video->cap._VPO = 1;
 934         }
 935 }
 936
 937 /*
 938  * Check whether the video bus device has required AML method to
 939  * support the desired features
 940  */
 941
 942 static int acpi_video_bus_check(struct acpi_video_bus *video)
 943 {
 944         acpi_status status = -ENOENT;
 945         struct pci_dev *dev;
 946
 947         if (!video)
 948                 return -EINVAL;
 949
 950         dev = acpi_get_pci_dev(video->device->handle);
 951         if (!dev)
 952                 return -ENODEV;
 953         pci_dev_put(dev);
 954
 955         /* Since there is no HID, CID and so on for VGA driver, we have
 956          * to check well known required nodes.
 957          */
 958
 959         /* Does this device support video switching? */
 960         if (video->cap._DOS || video->cap._DOD) {
 961                 if (!video->cap._DOS) {
 962                         printk(KERN_WARNING FW_BUG
 963                                 "ACPI(%s) defines _DOD but not _DOS\n",
 964                                 acpi_device_bid(video->device));
 965                 }
 966                 video->flags.multihead = 1;
 967                 status = 0;
 968         }
 969
 970         /* Does this device support retrieving a video ROM? */
 971         if (video->cap._ROM) {
 972                 video->flags.rom = 1;
 973                 status = 0;
 974         }
 975
 976         /* Does this device support configuring which video device to POST? */
 977         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 978                 video->flags.post = 1;
 979                 status = 0;
 980         }
 981
 982         return status;
 983 }
 984
 985 /* --------------------------------------------------------------------------
 986                                  Driver Interface
 987    -------------------------------------------------------------------------- */
 988
 989 /* device interface */
 990 static struct acpi_video_device_attrib*
 991 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 992 {
 993         struct acpi_video_enumerated_device *ids;
 994         int i;
 995
 996         for (i = 0; i < video->attached_count; i++) {
 997                 ids = &video->attached_array[i];
 998                 if ((ids->value.int_val & 0xffff) == device_id)
 999                         return &ids->value.attrib;
1000         }
1001
1002         return NULL;
1003 }
1004
1005 static int
1006 acpi_video_get_device_type(struct acpi_video_bus *video,
1007                            unsigned long device_id)
1008 {
1009         struct acpi_video_enumerated_device *ids;
1010         int i;
1011
1012         for (i = 0; i < video->attached_count; i++) {
1013                 ids = &video->attached_array[i];
1014                 if ((ids->value.int_val & 0xffff) == device_id)
1015                         return ids->value.int_val;
1016         }
1017
1018         return 0;
1019 }
1020
1021 static int
1022 acpi_video_bus_get_one_device(struct acpi_device *device,
1023                               struct acpi_video_bus *video)
1024 {
1025         unsigned long long device_id;
1026         int status, device_type;
1027         struct acpi_video_device *data;
1028         struct acpi_video_device_attrib* attribute;
1029
1030         if (!device || !video)
1031                 return -EINVAL;
1032
1033         status =
1034             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1035         if (ACPI_SUCCESS(status)) {
1036
1037                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1038                 if (!data)
1039                         return -ENOMEM;
1040
1041                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1042                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1043                 device->driver_data = data;
1044
1045                 data->device_id = device_id;
1046                 data->video = video;
1047                 data->dev = device;
1048
1049                 attribute = acpi_video_get_device_attr(video, device_id);
1050
1051                 if((attribute != NULL) && attribute->device_id_scheme) {
1052                         switch (attribute->display_type) {
1053                         case ACPI_VIDEO_DISPLAY_CRT:
1054                                 data->flags.crt = 1;
1055                                 break;
1056                         case ACPI_VIDEO_DISPLAY_TV:
1057                                 data->flags.tvout = 1;
1058                                 break;
1059                         case ACPI_VIDEO_DISPLAY_DVI:
1060                                 data->flags.dvi = 1;
1061                                 break;
1062                         case ACPI_VIDEO_DISPLAY_LCD:
1063                                 data->flags.lcd = 1;
1064                                 break;
1065                         default:
1066                                 data->flags.unknown = 1;
1067                                 break;
1068                         }
1069                         if(attribute->bios_can_detect)
1070                                 data->flags.bios = 1;
1071                 } else {
1072                         /* Check for legacy IDs */
1073                         device_type = acpi_video_get_device_type(video,
1074                                                                  device_id);
1075                         /* Ignore bits 16 and 18-20 */
1076                         switch (device_type & 0xffe2ffff) {
1077                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1078                                 data->flags.crt = 1;
1079                                 break;
1080                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1081                                 data->flags.lcd = 1;
1082                                 break;
1083                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1084                                 data->flags.tvout = 1;
1085                                 break;
1086                         default:
1087                                 data->flags.unknown = 1;
1088                         }
1089                 }
1090
1091                 acpi_video_device_bind(video, data);
1092                 acpi_video_device_find_cap(data);
1093
1094                 status = acpi_install_notify_handler(device->handle,
1095                                                      ACPI_DEVICE_NOTIFY,
1096                                                      acpi_video_device_notify,
1097                                                      data);
1098                 if (ACPI_FAILURE(status)) {
1099                         printk(KERN_ERR PREFIX
1100                                           "Error installing notify handler\n");
1101                         if(data->brightness)
1102                                 kfree(data->brightness->levels);
1103                         kfree(data->brightness);
1104                         kfree(data);
1105                         return -ENODEV;
1106                 }
1107
1108                 mutex_lock(&video->device_list_lock);
1109                 list_add_tail(&data->entry, &video->video_device_list);
1110                 mutex_unlock(&video->device_list_lock);
1111
1112                 return 0;
1113         }
1114
1115         return -ENOENT;
1116 }
1117
1118 /*
1119  *  Arg:
1120  *      video   : video bus device
1121  *
1122  *  Return:
1123  *      none
1124  *
1125  *  Enumerate the video device list of the video bus,
1126  *  bind the ids with the corresponding video devices
1127  *  under the video bus.
1128  */
1129
1130 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1131 {
1132         struct acpi_video_device *dev;
1133
1134         mutex_lock(&video->device_list_lock);
1135
1136         list_for_each_entry(dev, &video->video_device_list, entry)
1137                 acpi_video_device_bind(video, dev);
1138
1139         mutex_unlock(&video->device_list_lock);
1140 }
1141
1142 /*
1143  *  Arg:
1144  *      video   : video bus device
1145  *      device  : video output device under the video
1146  *              bus
1147  *
1148  *  Return:
1149  *      none
1150  *
1151  *  Bind the ids with the corresponding video devices
1152  *  under the video bus.
1153  */
1154
1155 static void
1156 acpi_video_device_bind(struct acpi_video_bus *video,
1157                        struct acpi_video_device *device)
1158 {
1159         struct acpi_video_enumerated_device *ids;
1160         int i;
1161
1162         for (i = 0; i < video->attached_count; i++) {
1163                 ids = &video->attached_array[i];
1164                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1165                         ids->bind_info = device;
1166                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1167                 }
1168         }
1169 }
1170
1171 /*
1172  *  Arg:
1173  *      video   : video bus device
1174  *
1175  *  Return:
1176  *      < 0     : error
1177  *
1178  *  Call _DOD to enumerate all devices attached to display adapter
1179  *
1180  */
1181
1182 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1183 {
1184         int status;
1185         int count;
1186         int i;
1187         struct acpi_video_enumerated_device *active_list;
1188         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1189         union acpi_object *dod = NULL;
1190         union acpi_object *obj;
1191
1192         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1193         if (!ACPI_SUCCESS(status)) {
1194                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1195                 return status;
1196         }
1197
1198         dod = buffer.pointer;
1199         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1200                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1201                 status = -EFAULT;
1202                 goto out;
1203         }
1204
1205         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1206                           dod->package.count));
1207
1208         active_list = kcalloc(1 + dod->package.count,
1209                               sizeof(struct acpi_video_enumerated_device),
1210                               GFP_KERNEL);
1211         if (!active_list) {
1212                 status = -ENOMEM;
1213                 goto out;
1214         }
1215
1216         count = 0;
1217         for (i = 0; i < dod->package.count; i++) {
1218                 obj = &dod->package.elements[i];
1219
1220                 if (obj->type != ACPI_TYPE_INTEGER) {
1221                         printk(KERN_ERR PREFIX
1222                                 "Invalid _DOD data in element %d\n", i);
1223                         continue;
1224                 }
1225
1226                 active_list[count].value.int_val = obj->integer.value;
1227                 active_list[count].bind_info = NULL;
1228                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1229                                   (int)obj->integer.value));
1230                 count++;
1231         }
1232
1233         kfree(video->attached_array);
1234
1235         video->attached_array = active_list;
1236         video->attached_count = count;
1237
1238  out:
1239         kfree(buffer.pointer);
1240         return status;
1241 }
1242
1243 static int
1244 acpi_video_get_next_level(struct acpi_video_device *device,
1245                           u32 level_current, u32 event)
1246 {
1247         int min, max, min_above, max_below, i, l, delta = 255;
1248         max = max_below = 0;
1249         min = min_above = 255;
1250         /* Find closest level to level_current */
1251         for (i = 2; i < device->brightness->count; i++) {
1252                 l = device->brightness->levels[i];
1253                 if (abs(l - level_current) < abs(delta)) {
1254                         delta = l - level_current;
1255                         if (!delta)
1256                                 break;
1257                 }
1258         }
1259         /* Ajust level_current to closest available level */
1260         level_current += delta;
1261         for (i = 2; i < device->brightness->count; i++) {
1262                 l = device->brightness->levels[i];
1263                 if (l < min)
1264                         min = l;
1265                 if (l > max)
1266                         max = l;
1267                 if (l < min_above && l > level_current)
1268                         min_above = l;
1269                 if (l > max_below && l < level_current)
1270                         max_below = l;
1271         }
1272
1273         switch (event) {
1274         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1275                 return (level_current < max) ? min_above : min;
1276         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1277                 return (level_current < max) ? min_above : max;
1278         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1279                 return (level_current > min) ? max_below : min;
1280         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1281         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1282                 return 0;
1283         default:
1284                 return level_current;
1285         }
1286 }
1287
1288 static int
1289 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1290 {
1291         unsigned long long level_current, level_next;
1292         int result = -EINVAL;
1293
1294         /* no warning message if acpi_backlight=vendor is used */
1295         if (!acpi_video_backlight_support())
1296                 return 0;
1297
1298         if (!device->brightness)
1299                 goto out;
1300
1301         result = acpi_video_device_lcd_get_level_current(device,
1302                                                          &level_current,
1303                                                          false);
1304         if (result)
1305                 goto out;
1306
1307         level_next = acpi_video_get_next_level(device, level_current, event);
1308
1309         result = acpi_video_device_lcd_set_level(device, level_next);
1310
1311         if (!result)
1312                 backlight_force_update(device->backlight,
1313                                        BACKLIGHT_UPDATE_HOTKEY);
1314
1315 out:
1316         if (result)
1317                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1318
1319         return result;
1320 }
1321
1322 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1323                         void **edid)
1324 {
1325         struct acpi_video_bus *video;
1326         struct acpi_video_device *video_device;
1327         union acpi_object *buffer = NULL;
1328         acpi_status status;
1329         int i, length;
1330
1331         if (!device || !acpi_driver_data(device))
1332                 return -EINVAL;
1333
1334         video = acpi_driver_data(device);
1335
1336         for (i = 0; i < video->attached_count; i++) {
1337                 video_device = video->attached_array[i].bind_info;
1338                 length = 256;
1339
1340                 if (!video_device)
1341                         continue;
1342
1343                 if (!video_device->cap._DDC)
1344                         continue;
1345
1346                 if (type) {
1347                         switch (type) {
1348                         case ACPI_VIDEO_DISPLAY_CRT:
1349                                 if (!video_device->flags.crt)
1350                                         continue;
1351                                 break;
1352                         case ACPI_VIDEO_DISPLAY_TV:
1353                                 if (!video_device->flags.tvout)
1354                                         continue;
1355                                 break;
1356                         case ACPI_VIDEO_DISPLAY_DVI:
1357                                 if (!video_device->flags.dvi)
1358                                         continue;
1359                                 break;
1360                         case ACPI_VIDEO_DISPLAY_LCD:
1361                                 if (!video_device->flags.lcd)
1362                                         continue;
1363                                 break;
1364                         }
1365                 } else if (video_device->device_id != device_id) {
1366                         continue;
1367                 }
1368
1369                 status = acpi_video_device_EDID(video_device, &buffer, length);
1370
1371                 if (ACPI_FAILURE(status) || !buffer ||
1372                     buffer->type != ACPI_TYPE_BUFFER) {
1373                         length = 128;
1374                         status = acpi_video_device_EDID(video_device, &buffer,
1375                                                         length);
1376                         if (ACPI_FAILURE(status) || !buffer ||
1377                             buffer->type != ACPI_TYPE_BUFFER) {
1378                                 continue;
1379                         }
1380                 }
1381
1382                 *edid = buffer->buffer.pointer;
1383                 return length;
1384         }
1385
1386         return -ENODEV;
1387 }
1388 EXPORT_SYMBOL(acpi_video_get_edid);
1389
1390 static int
1391 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1392                            struct acpi_device *device)
1393 {
1394         int status = 0;
1395         struct acpi_device *dev;
1396
1397         /*
1398          * There are systems where video module known to work fine regardless
1399          * of broken _DOD and ignoring returned value here doesn't cause
1400          * any issues later.
1401          */
1402         acpi_video_device_enumerate(video);
1403
1404         list_for_each_entry(dev, &device->children, node) {
1405
1406                 status = acpi_video_bus_get_one_device(dev, video);
1407                 if (status) {
1408                         printk(KERN_WARNING PREFIX
1409                                         "Can't attach device\n");
1410                         continue;
1411                 }
1412         }
1413         return status;
1414 }
1415
1416 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1417 {
1418         acpi_status status;
1419
1420         if (!device || !device->video)
1421                 return -ENOENT;
1422
1423         status = acpi_remove_notify_handler(device->dev->handle,
1424                                             ACPI_DEVICE_NOTIFY,
1425                                             acpi_video_device_notify);
1426         if (ACPI_FAILURE(status)) {
1427                 printk(KERN_WARNING PREFIX
1428                        "Can't remove video notify handler\n");
1429         }
1430         if (device->backlight) {
1431                 backlight_device_unregister(device->backlight);
1432                 device->backlight = NULL;
1433         }
1434         if (device->cooling_dev) {
1435                 sysfs_remove_link(&device->dev->dev.kobj,
1436                                   "thermal_cooling");
1437                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1438                                   "device");
1439                 thermal_cooling_device_unregister(device->cooling_dev);
1440                 device->cooling_dev = NULL;
1441         }
1442
1443         return 0;
1444 }
1445
1446 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1447 {
1448         int status;
1449         struct acpi_video_device *dev, *next;
1450
1451         mutex_lock(&video->device_list_lock);
1452
1453         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1454
1455                 status = acpi_video_bus_put_one_device(dev);
1456                 if (ACPI_FAILURE(status))
1457                         printk(KERN_WARNING PREFIX
1458                                "hhuuhhuu bug in acpi video driver.\n");
1459
1460                 if (dev->brightness) {
1461                         kfree(dev->brightness->levels);
1462                         kfree(dev->brightness);
1463                 }
1464                 list_del(&dev->entry);
1465                 kfree(dev);
1466         }
1467
1468         mutex_unlock(&video->device_list_lock);
1469
1470         return 0;
1471 }
1472
1473 /* acpi_video interface */
1474
1475 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1476 {
1477         return acpi_video_bus_DOS(video, 0, 0);
1478 }
1479
1480 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1481 {
1482         return acpi_video_bus_DOS(video, 0, 1);
1483 }
1484
1485 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1486 {
1487         struct acpi_video_bus *video = acpi_driver_data(device);
1488         struct input_dev *input;
1489         int keycode = 0;
1490
1491         if (!video)
1492                 return;
1493
1494         input = video->input;
1495
1496         switch (event) {
1497         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1498                                          * most likely via hotkey. */
1499                 acpi_bus_generate_proc_event(device, event, 0);
1500                 keycode = KEY_SWITCHVIDEOMODE;
1501                 break;
1502
1503         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1504                                          * connector. */
1505                 acpi_video_device_enumerate(video);
1506                 acpi_video_device_rebind(video);
1507                 acpi_bus_generate_proc_event(device, event, 0);
1508                 keycode = KEY_SWITCHVIDEOMODE;
1509                 break;
1510
1511         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1512                 acpi_bus_generate_proc_event(device, event, 0);
1513                 keycode = KEY_SWITCHVIDEOMODE;
1514                 break;
1515         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1516                 acpi_bus_generate_proc_event(device, event, 0);
1517                 keycode = KEY_VIDEO_NEXT;
1518                 break;
1519         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1520                 acpi_bus_generate_proc_event(device, event, 0);
1521                 keycode = KEY_VIDEO_PREV;
1522                 break;
1523
1524         default:
1525                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1526                                   "Unsupported event [0x%x]\n", event));
1527                 break;
1528         }
1529
1530         if (acpi_notifier_call_chain(device, event, 0))
1531                 /* Something vetoed the keypress. */
1532                 keycode = 0;
1533
1534         if (keycode) {
1535                 input_report_key(input, keycode, 1);
1536                 input_sync(input);
1537                 input_report_key(input, keycode, 0);
1538                 input_sync(input);
1539         }
1540
1541         return;
1542 }
1543
1544 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1545 {
1546         struct acpi_video_device *video_device = data;
1547         struct acpi_device *device = NULL;
1548         struct acpi_video_bus *bus;
1549         struct input_dev *input;
1550         int keycode = 0;
1551
1552         if (!video_device)
1553                 return;
1554
1555         device = video_device->dev;
1556         bus = video_device->video;
1557         input = bus->input;
1558
1559         switch (event) {
1560         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1561                 if (brightness_switch_enabled)
1562                         acpi_video_switch_brightness(video_device, event);
1563                 acpi_bus_generate_proc_event(device, event, 0);
1564                 keycode = KEY_BRIGHTNESS_CYCLE;
1565                 break;
1566         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1567                 if (brightness_switch_enabled)
1568                         acpi_video_switch_brightness(video_device, event);
1569                 acpi_bus_generate_proc_event(device, event, 0);
1570                 keycode = KEY_BRIGHTNESSUP;
1571                 break;
1572         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1573                 if (brightness_switch_enabled)
1574                         acpi_video_switch_brightness(video_device, event);
1575                 acpi_bus_generate_proc_event(device, event, 0);
1576                 keycode = KEY_BRIGHTNESSDOWN;
1577                 break;
1578         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1579                 if (brightness_switch_enabled)
1580                         acpi_video_switch_brightness(video_device, event);
1581                 acpi_bus_generate_proc_event(device, event, 0);
1582                 keycode = KEY_BRIGHTNESS_ZERO;
1583                 break;
1584         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1585                 if (brightness_switch_enabled)
1586                         acpi_video_switch_brightness(video_device, event);
1587                 acpi_bus_generate_proc_event(device, event, 0);
1588                 keycode = KEY_DISPLAY_OFF;
1589                 break;
1590         default:
1591                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1592                                   "Unsupported event [0x%x]\n", event));
1593                 break;
1594         }
1595
1596         acpi_notifier_call_chain(device, event, 0);
1597
1598         if (keycode) {
1599                 input_report_key(input, keycode, 1);
1600                 input_sync(input);
1601                 input_report_key(input, keycode, 0);
1602                 input_sync(input);
1603         }
1604
1605         return;
1606 }
1607
1608 static int acpi_video_resume(struct notifier_block *nb,
1609                                 unsigned long val, void *ign)
1610 {
1611         struct acpi_video_bus *video;
1612         struct acpi_video_device *video_device;
1613         int i;
1614
1615         switch (val) {
1616         case PM_HIBERNATION_PREPARE:
1617         case PM_SUSPEND_PREPARE:
1618         case PM_RESTORE_PREPARE:
1619                 return NOTIFY_DONE;
1620         }
1621
1622         video = container_of(nb, struct acpi_video_bus, pm_nb);
1623
1624         dev_info(&video->device->dev, "Restoring backlight state\n");
1625
1626         for (i = 0; i < video->attached_count; i++) {
1627                 video_device = video->attached_array[i].bind_info;
1628                 if (video_device && video_device->backlight)
1629                         acpi_video_set_brightness(video_device->backlight);
1630         }
1631
1632         return NOTIFY_OK;
1633 }
1634
1635 static acpi_status
1636 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1637                         void **return_value)
1638 {
1639         struct acpi_device *device = context;
1640         struct acpi_device *sibling;
1641         int result;
1642
1643         if (handle == device->handle)
1644                 return AE_CTRL_TERMINATE;
1645
1646         result = acpi_bus_get_device(handle, &sibling);
1647         if (result)
1648                 return AE_OK;
1649
1650         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1651                         return AE_ALREADY_EXISTS;
1652
1653         return AE_OK;
1654 }
1655
1656 static int instance;
1657
1658 static int acpi_video_bus_add(struct acpi_device *device)
1659 {
1660         struct acpi_video_bus *video;
1661         struct input_dev *input;
1662         int error;
1663         acpi_status status;
1664
1665         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1666                                 device->parent->handle, 1,
1667                                 acpi_video_bus_match, NULL,
1668                                 device, NULL);
1669         if (status == AE_ALREADY_EXISTS) {
1670                 printk(KERN_WARNING FW_BUG
1671                         "Duplicate ACPI video bus devices for the"
1672                         " same VGA controller, please try module "
1673                         "parameter \"video.allow_duplicates=1\""
1674                         "if the current driver doesn't work.\n");
1675                 if (!allow_duplicates)
1676                         return -ENODEV;
1677         }
1678
1679         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1680         if (!video)
1681                 return -ENOMEM;
1682
1683         /* a hack to fix the duplicate name "VID" problem on T61 */
1684         if (!strcmp(device->pnp.bus_id, "VID")) {
1685                 if (instance)
1686                         device->pnp.bus_id[3] = '0' + instance;
1687                 instance ++;
1688         }
1689         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1690         if (!strcmp(device->pnp.bus_id, "VGA")) {
1691                 if (instance)
1692                         device->pnp.bus_id[3] = '0' + instance;
1693                 instance++;
1694         }
1695
1696         video->device = device;
1697         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1698         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1699         device->driver_data = video;
1700
1701         acpi_video_bus_find_cap(video);
1702         error = acpi_video_bus_check(video);
1703         if (error)
1704                 goto err_free_video;
1705
1706         mutex_init(&video->device_list_lock);
1707         INIT_LIST_HEAD(&video->video_device_list);
1708
1709         error = acpi_video_bus_get_devices(video, device);
1710         if (error)
1711                 goto err_free_video;
1712
1713         video->input = input = input_allocate_device();
1714         if (!input) {
1715                 error = -ENOMEM;
1716                 goto err_put_video;
1717         }
1718
1719         error = acpi_video_bus_start_devices(video);
1720         if (error)
1721                 goto err_free_input_dev;
1722
1723         snprintf(video->phys, sizeof(video->phys),
1724                 "%s/video/input0", acpi_device_hid(video->device));
1725
1726         input->name = acpi_device_name(video->device);
1727         input->phys = video->phys;
1728         input->id.bustype = BUS_HOST;
1729         input->id.product = 0x06;
1730         input->dev.parent = &device->dev;
1731         input->evbit[0] = BIT(EV_KEY);
1732         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1733         set_bit(KEY_VIDEO_NEXT, input->keybit);
1734         set_bit(KEY_VIDEO_PREV, input->keybit);
1735         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1736         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1737         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1738         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1739         set_bit(KEY_DISPLAY_OFF, input->keybit);
1740
1741         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1742                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1743                video->flags.multihead ? "yes" : "no",
1744                video->flags.rom ? "yes" : "no",
1745                video->flags.post ? "yes" : "no");
1746
1747         video->pm_nb.notifier_call = acpi_video_resume;
1748         video->pm_nb.priority = 0;
1749         error = register_pm_notifier(&video->pm_nb);
1750         if (error)
1751                 goto err_stop_video;
1752
1753         error = input_register_device(input);
1754         if (error)
1755                 goto err_unregister_pm_notifier;
1756
1757         return 0;
1758
1759  err_unregister_pm_notifier:
1760         unregister_pm_notifier(&video->pm_nb);
1761  err_stop_video:
1762         acpi_video_bus_stop_devices(video);
1763  err_free_input_dev:
1764         input_free_device(input);
1765  err_put_video:
1766         acpi_video_bus_put_devices(video);
1767         kfree(video->attached_array);
1768  err_free_video:
1769         kfree(video);
1770         device->driver_data = NULL;
1771
1772         return error;
1773 }
1774
1775 static int acpi_video_bus_remove(struct acpi_device *device)
1776 {
1777         struct acpi_video_bus *video = NULL;
1778
1779
1780         if (!device || !acpi_driver_data(device))
1781                 return -EINVAL;
1782
1783         video = acpi_driver_data(device);
1784
1785         unregister_pm_notifier(&video->pm_nb);
1786
1787         acpi_video_bus_stop_devices(video);
1788         acpi_video_bus_put_devices(video);
1789
1790         input_unregister_device(video->input);
1791         kfree(video->attached_array);
1792         kfree(video);
1793
1794         return 0;
1795 }
1796
1797 static int __init is_i740(struct pci_dev *dev)
1798 {
1799         if (dev->device == 0x00D1)
1800                 return 1;
1801         if (dev->device == 0x7000)
1802                 return 1;
1803         return 0;
1804 }
1805
1806 static int __init intel_opregion_present(void)
1807 {
1808         int opregion = 0;
1809         struct pci_dev *dev = NULL;
1810         u32 address;
1811
1812         for_each_pci_dev(dev) {
1813                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1814                         continue;
1815                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1816                         continue;
1817                 /* We don't want to poke around undefined i740 registers */
1818                 if (is_i740(dev))
1819                         continue;
1820                 pci_read_config_dword(dev, 0xfc, &address);
1821                 if (!address)
1822                         continue;
1823                 opregion = 1;
1824         }
1825         return opregion;
1826 }
1827
1828 int acpi_video_register(void)
1829 {
1830         int result = 0;
1831         if (register_count) {
1832                 /*
1833                  * if the function of acpi_video_register is already called,
1834                  * don't register the acpi_vide_bus again and return no error.
1835                  */
1836                 return 0;
1837         }
1838
1839         result = acpi_bus_register_driver(&acpi_video_bus);
1840         if (result < 0)
1841                 return -ENODEV;
1842
1843         /*
1844          * When the acpi_video_bus is loaded successfully, increase
1845          * the counter reference.
1846          */
1847         register_count = 1;
1848
1849         return 0;
1850 }
1851 EXPORT_SYMBOL(acpi_video_register);
1852
1853 void acpi_video_unregister(void)
1854 {
1855         if (!register_count) {
1856                 /*
1857                  * If the acpi video bus is already unloaded, don't
1858                  * unload it again and return directly.
1859                  */
1860                 return;
1861         }
1862         acpi_bus_unregister_driver(&acpi_video_bus);
1863
1864         register_count = 0;
1865
1866         return;
1867 }
1868 EXPORT_SYMBOL(acpi_video_unregister);
1869
1870 /*
1871  * This is kind of nasty. Hardware using Intel chipsets may require
1872  * the video opregion code to be run first in order to initialise
1873  * state before any ACPI video calls are made. To handle this we defer
1874  * registration of the video class until the opregion code has run.
1875  */
1876
1877 static int __init acpi_video_init(void)
1878 {
1879         dmi_check_system(video_dmi_table);
1880
1881         if (intel_opregion_present())
1882                 return 0;
1883
1884         return acpi_video_register();
1885 }
1886
1887 static void __exit acpi_video_exit(void)
1888 {
1889         acpi_video_unregister();
1890
1891         return;
1892 }
1893
1894 module_init(acpi_video_init);
1895 module_exit(acpi_video_exit);