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          .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          .callback = video_ignore_initial_backlight,
 460          .ident = "HP 1000 Notebook PC",
 461          .matches = {
 462                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 463                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 464                 },
 465         },
 466         {
 467          .callback = video_ignore_initial_backlight,
 468          .ident = "HP Pavilion m4",
 469          .matches = {
 470                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 471                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
 472                 },
 473         },
 474         {}
 475 };
 476
 477 static int
 478 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 479                                         unsigned long long *level, int init)
 480 {
 481         acpi_status status = AE_OK;
 482         int i;
 483
 484         if (device->cap._BQC || device->cap._BCQ) {
 485                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 486
 487                 status = acpi_evaluate_integer(device->dev->handle, buf,
 488                                                 NULL, level);
 489                 if (ACPI_SUCCESS(status)) {
 490                         if (device->brightness->flags._BQC_use_index) {
 491                                 if (device->brightness->flags._BCL_reversed)
 492                                         *level = device->brightness->count
 493                                                                  - 3 - (*level);
 494                                 *level = device->brightness->levels[*level + 2];
 495
 496                         }
 497                         *level += bqc_offset_aml_bug_workaround;
 498                         for (i = 2; i < device->brightness->count; i++)
 499                                 if (device->brightness->levels[i] == *level) {
 500                                         device->brightness->curr = *level;
 501                                         return 0;
 502                         }
 503                         if (!init) {
 504                                 /*
 505                                  * BQC returned an invalid level.
 506                                  * Stop using it.
 507                                  */
 508                                 ACPI_WARNING((AE_INFO,
 509                                               "%s returned an invalid level",
 510                                               buf));
 511                                 device->cap._BQC = device->cap._BCQ = 0;
 512                         }
 513                 } else {
 514                         /* Fixme:
 515                          * should we return an error or ignore this failure?
 516                          * dev->brightness->curr is a cached value which stores
 517                          * the correct current backlight level in most cases.
 518                          * ACPI video backlight still works w/ buggy _BQC.
 519                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 520                          */
 521                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 522                         device->cap._BQC = device->cap._BCQ = 0;
 523                 }
 524         }
 525
 526         *level = device->brightness->curr;
 527         return 0;
 528 }
 529
 530 static int
 531 acpi_video_device_EDID(struct acpi_video_device *device,
 532                        union acpi_object **edid, ssize_t length)
 533 {
 534         int status;
 535         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 536         union acpi_object *obj;
 537         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 538         struct acpi_object_list args = { 1, &arg0 };
 539
 540
 541         *edid = NULL;
 542
 543         if (!device)
 544                 return -ENODEV;
 545         if (length == 128)
 546                 arg0.integer.value = 1;
 547         else if (length == 256)
 548                 arg0.integer.value = 2;
 549         else
 550                 return -EINVAL;
 551
 552         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 553         if (ACPI_FAILURE(status))
 554                 return -ENODEV;
 555
 556         obj = buffer.pointer;
 557
 558         if (obj && obj->type == ACPI_TYPE_BUFFER)
 559                 *edid = obj;
 560         else {
 561                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 562                 status = -EFAULT;
 563                 kfree(obj);
 564         }
 565
 566         return status;
 567 }
 568
 569 /* bus */
 570
 571 /*
 572  *  Arg:
 573  *      video           : video bus device pointer
 574  *      bios_flag       :
 575  *              0.      The system BIOS should NOT automatically switch(toggle)
 576  *                      the active display output.
 577  *              1.      The system BIOS should automatically switch (toggle) the
 578  *                      active display output. No switch event.
 579  *              2.      The _DGS value should be locked.
 580  *              3.      The system BIOS should not automatically switch (toggle) the
 581  *                      active display output, but instead generate the display switch
 582  *                      event notify code.
 583  *      lcd_flag        :
 584  *              0.      The system BIOS should automatically control the brightness level
 585  *                      of the LCD when the power changes from AC to DC
 586  *              1.      The system BIOS should NOT automatically control the brightness
 587  *                      level of the LCD when the power changes from AC to DC.
 588  * Return Value:
 589  *              -1      wrong arg.
 590  */
 591
 592 static int
 593 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 594 {
 595         u64 status = 0;
 596         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 597         struct acpi_object_list args = { 1, &arg0 };
 598
 599
 600         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 601                 status = -1;
 602                 goto Failed;
 603         }
 604         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 605         video->dos_setting = arg0.integer.value;
 606         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 607
 608       Failed:
 609         return status;
 610 }
 611
 612 /*
 613  * Simple comparison function used to sort backlight levels.
 614  */
 615
 616 static int
 617 acpi_video_cmp_level(const void *a, const void *b)
 618 {
 619         return *(int *)a - *(int *)b;
 620 }
 621
 622 /*
 623  *  Arg:
 624  *      device  : video output device (LCD, CRT, ..)
 625  *
 626  *  Return Value:
 627  *      Maximum brightness level
 628  *
 629  *  Allocate and initialize device->brightness.
 630  */
 631
 632 static int
 633 acpi_video_init_brightness(struct acpi_video_device *device)
 634 {
 635         union acpi_object *obj = NULL;
 636         int i, max_level = 0, count = 0, level_ac_battery = 0;
 637         unsigned long long level, level_old;
 638         union acpi_object *o;
 639         struct acpi_video_device_brightness *br = NULL;
 640         int result = -EINVAL;
 641
 642         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 643                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 644                                                 "LCD brightness level\n"));
 645                 goto out;
 646         }
 647
 648         if (obj->package.count < 2)
 649                 goto out;
 650
 651         br = kzalloc(sizeof(*br), GFP_KERNEL);
 652         if (!br) {
 653                 printk(KERN_ERR "can't allocate memory\n");
 654                 result = -ENOMEM;
 655                 goto out;
 656         }
 657
 658         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 659                                 GFP_KERNEL);
 660         if (!br->levels) {
 661                 result = -ENOMEM;
 662                 goto out_free;
 663         }
 664
 665         for (i = 0; i < obj->package.count; i++) {
 666                 o = (union acpi_object *)&obj->package.elements[i];
 667                 if (o->type != ACPI_TYPE_INTEGER) {
 668                         printk(KERN_ERR PREFIX "Invalid data\n");
 669                         continue;
 670                 }
 671                 br->levels[count] = (u32) o->integer.value;
 672
 673                 if (br->levels[count] > max_level)
 674                         max_level = br->levels[count];
 675                 count++;
 676         }
 677
 678         /*
 679          * some buggy BIOS don't export the levels
 680          * when machine is on AC/Battery in _BCL package.
 681          * In this case, the first two elements in _BCL packages
 682          * are also supported brightness levels that OS should take care of.
 683          */
 684         for (i = 2; i < count; i++) {
 685                 if (br->levels[i] == br->levels[0])
 686                         level_ac_battery++;
 687                 if (br->levels[i] == br->levels[1])
 688                         level_ac_battery++;
 689         }
 690
 691         if (level_ac_battery < 2) {
 692                 level_ac_battery = 2 - level_ac_battery;
 693                 br->flags._BCL_no_ac_battery_levels = 1;
 694                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 695                         br->levels[i] = br->levels[i - level_ac_battery];
 696                 count += level_ac_battery;
 697         } else if (level_ac_battery > 2)
 698                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 699
 700         /* Check if the _BCL package is in a reversed order */
 701         if (max_level == br->levels[2]) {
 702                 br->flags._BCL_reversed = 1;
 703                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 704                         acpi_video_cmp_level, NULL);
 705         } else if (max_level != br->levels[count - 1])
 706                 ACPI_ERROR((AE_INFO,
 707                             "Found unordered _BCL package\n"));
 708
 709         br->count = count;
 710         device->brightness = br;
 711
 712         /* Check the input/output of _BQC/_BCL/_BCM */
 713         if ((max_level < 100) && (max_level <= (count - 2)))
 714                 br->flags._BCL_use_index = 1;
 715
 716         /*
 717          * _BCM is always consistent with _BCL,
 718          * at least for all the laptops we have ever seen.
 719          */
 720         br->flags._BCM_use_index = br->flags._BCL_use_index;
 721
 722         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 723         br->curr = level = max_level;
 724
 725         if (!device->cap._BQC)
 726                 goto set_level;
 727
 728         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 729         if (result)
 730                 goto out_free_levels;
 731
 732         /*
 733          * Set the level to maximum and check if _BQC uses indexed value
 734          */
 735         result = acpi_video_device_lcd_set_level(device, max_level);
 736         if (result)
 737                 goto out_free_levels;
 738
 739         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 740         if (result)
 741                 goto out_free_levels;
 742
 743         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 744
 745         if (!br->flags._BQC_use_index) {
 746                 /*
 747                  * Set the backlight to the initial state.
 748                  * On some buggy laptops, _BQC returns an uninitialized value
 749                  * when invoked for the first time, i.e. level_old is invalid.
 750                  * set the backlight to max_level in this case
 751                  */
 752                 if (use_bios_initial_backlight) {
 753                         for (i = 2; i < br->count; i++)
 754                                 if (level_old == br->levels[i])
 755                                         level = level_old;
 756                 }
 757                 goto set_level;
 758         }
 759
 760         if (br->flags._BCL_reversed)
 761                 level_old = (br->count - 1) - level_old;
 762         level = br->levels[level_old];
 763
 764 set_level:
 765         result = acpi_video_device_lcd_set_level(device, level);
 766         if (result)
 767                 goto out_free_levels;
 768
 769         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 770                           "found %d brightness levels\n", count - 2));
 771         kfree(obj);
 772         return result;
 773
 774 out_free_levels:
 775         kfree(br->levels);
 776 out_free:
 777         kfree(br);
 778 out:
 779         device->brightness = NULL;
 780         kfree(obj);
 781         return result;
 782 }
 783
 784 /*
 785  *  Arg:
 786  *      device  : video output device (LCD, CRT, ..)
 787  *
 788  *  Return Value:
 789  *      None
 790  *
 791  *  Find out all required AML methods defined under the output
 792  *  device.
 793  */
 794
 795 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 796 {
 797         acpi_handle h_dummy1;
 798
 799         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 800                 device->cap._ADR = 1;
 801         }
 802         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 803                 device->cap._BCL = 1;
 804         }
 805         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 806                 device->cap._BCM = 1;
 807         }
 808         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 809                 device->cap._BQC = 1;
 810         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 811                                 &h_dummy1))) {
 812                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 813                 device->cap._BCQ = 1;
 814         }
 815
 816         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 817                 device->cap._DDC = 1;
 818         }
 819
 820         if (acpi_video_backlight_support()) {
 821                 struct backlight_properties props;
 822                 struct pci_dev *pdev;
 823                 acpi_handle acpi_parent;
 824                 struct device *parent = NULL;
 825                 int result;
 826                 static int count = 0;
 827                 char *name;
 828
 829                 result = acpi_video_init_brightness(device);
 830                 if (result)
 831                         return;
 832                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 833                 if (!name)
 834                         return;
 835                 count++;
 836
 837                 acpi_get_parent(device->dev->handle, &acpi_parent);
 838
 839                 pdev = acpi_get_pci_dev(acpi_parent);
 840                 if (pdev) {
 841                         parent = &pdev->dev;
 842                         pci_dev_put(pdev);
 843                 }
 844
 845                 memset(&props, 0, sizeof(struct backlight_properties));
 846                 props.type = BACKLIGHT_FIRMWARE;
 847                 props.max_brightness = device->brightness->count - 3;
 848                 device->backlight = backlight_device_register(name,
 849                                                               parent,
 850                                                               device,
 851                                                               &acpi_backlight_ops,
 852                                                               &props);
 853                 kfree(name);
 854                 if (IS_ERR(device->backlight))
 855                         return;
 856
 857                 /*
 858                  * Save current brightness level in case we have to restore it
 859                  * before acpi_video_device_lcd_set_level() is called next time.
 860                  */
 861                 device->backlight->props.brightness =
 862                                 acpi_video_get_brightness(device->backlight);
 863
 864                 device->cooling_dev = thermal_cooling_device_register("LCD",
 865                                         device->dev, &video_cooling_ops);
 866                 if (IS_ERR(device->cooling_dev)) {
 867                         /*
 868                          * Set cooling_dev to NULL so we don't crash trying to
 869                          * free it.
 870                          * Also, why the hell we are returning early and
 871                          * not attempt to register video output if cooling
 872                          * device registration failed?
 873                          * -- dtor
 874                          */
 875                         device->cooling_dev = NULL;
 876                         return;
 877                 }
 878
 879                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 880                          device->cooling_dev->id);
 881                 result = sysfs_create_link(&device->dev->dev.kobj,
 882                                 &device->cooling_dev->device.kobj,
 883                                 "thermal_cooling");
 884                 if (result)
 885                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 886                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 887                                 &device->dev->dev.kobj, "device");
 888                 if (result)
 889                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 890
 891         }
 892 }
 893
 894 /*
 895  *  Arg:
 896  *      device  : video output device (VGA)
 897  *
 898  *  Return Value:
 899  *      None
 900  *
 901  *  Find out all required AML methods defined under the video bus device.
 902  */
 903
 904 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 905 {
 906         acpi_handle h_dummy1;
 907
 908         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 909                 video->cap._DOS = 1;
 910         }
 911         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 912                 video->cap._DOD = 1;
 913         }
 914         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 915                 video->cap._ROM = 1;
 916         }
 917         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 918                 video->cap._GPD = 1;
 919         }
 920         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 921                 video->cap._SPD = 1;
 922         }
 923         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 924                 video->cap._VPO = 1;
 925         }
 926 }
 927
 928 /*
 929  * Check whether the video bus device has required AML method to
 930  * support the desired features
 931  */
 932
 933 static int acpi_video_bus_check(struct acpi_video_bus *video)
 934 {
 935         acpi_status status = -ENOENT;
 936         struct pci_dev *dev;
 937
 938         if (!video)
 939                 return -EINVAL;
 940
 941         dev = acpi_get_pci_dev(video->device->handle);
 942         if (!dev)
 943                 return -ENODEV;
 944         pci_dev_put(dev);
 945
 946         /* Since there is no HID, CID and so on for VGA driver, we have
 947          * to check well known required nodes.
 948          */
 949
 950         /* Does this device support video switching? */
 951         if (video->cap._DOS || video->cap._DOD) {
 952                 if (!video->cap._DOS) {
 953                         printk(KERN_WARNING FW_BUG
 954                                 "ACPI(%s) defines _DOD but not _DOS\n",
 955                                 acpi_device_bid(video->device));
 956                 }
 957                 video->flags.multihead = 1;
 958                 status = 0;
 959         }
 960
 961         /* Does this device support retrieving a video ROM? */
 962         if (video->cap._ROM) {
 963                 video->flags.rom = 1;
 964                 status = 0;
 965         }
 966
 967         /* Does this device support configuring which video device to POST? */
 968         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 969                 video->flags.post = 1;
 970                 status = 0;
 971         }
 972
 973         return status;
 974 }
 975
 976 /* --------------------------------------------------------------------------
 977                                  Driver Interface
 978    -------------------------------------------------------------------------- */
 979
 980 /* device interface */
 981 static struct acpi_video_device_attrib*
 982 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 983 {
 984         struct acpi_video_enumerated_device *ids;
 985         int i;
 986
 987         for (i = 0; i < video->attached_count; i++) {
 988                 ids = &video->attached_array[i];
 989                 if ((ids->value.int_val & 0xffff) == device_id)
 990                         return &ids->value.attrib;
 991         }
 992
 993         return NULL;
 994 }
 995
 996 static int
 997 acpi_video_get_device_type(struct acpi_video_bus *video,
 998                            unsigned long device_id)
 999 {
1000         struct acpi_video_enumerated_device *ids;
1001         int i;
1002
1003         for (i = 0; i < video->attached_count; i++) {
1004                 ids = &video->attached_array[i];
1005                 if ((ids->value.int_val & 0xffff) == device_id)
1006                         return ids->value.int_val;
1007         }
1008
1009         return 0;
1010 }
1011
1012 static int
1013 acpi_video_bus_get_one_device(struct acpi_device *device,
1014                               struct acpi_video_bus *video)
1015 {
1016         unsigned long long device_id;
1017         int status, device_type;
1018         struct acpi_video_device *data;
1019         struct acpi_video_device_attrib* attribute;
1020
1021         if (!device || !video)
1022                 return -EINVAL;
1023
1024         status =
1025             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1026         if (ACPI_SUCCESS(status)) {
1027
1028                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1029                 if (!data)
1030                         return -ENOMEM;
1031
1032                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1033                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1034                 device->driver_data = data;
1035
1036                 data->device_id = device_id;
1037                 data->video = video;
1038                 data->dev = device;
1039
1040                 attribute = acpi_video_get_device_attr(video, device_id);
1041
1042                 if((attribute != NULL) && attribute->device_id_scheme) {
1043                         switch (attribute->display_type) {
1044                         case ACPI_VIDEO_DISPLAY_CRT:
1045                                 data->flags.crt = 1;
1046                                 break;
1047                         case ACPI_VIDEO_DISPLAY_TV:
1048                                 data->flags.tvout = 1;
1049                                 break;
1050                         case ACPI_VIDEO_DISPLAY_DVI:
1051                                 data->flags.dvi = 1;
1052                                 break;
1053                         case ACPI_VIDEO_DISPLAY_LCD:
1054                                 data->flags.lcd = 1;
1055                                 break;
1056                         default:
1057                                 data->flags.unknown = 1;
1058                                 break;
1059                         }
1060                         if(attribute->bios_can_detect)
1061                                 data->flags.bios = 1;
1062                 } else {
1063                         /* Check for legacy IDs */
1064                         device_type = acpi_video_get_device_type(video,
1065                                                                  device_id);
1066                         /* Ignore bits 16 and 18-20 */
1067                         switch (device_type & 0xffe2ffff) {
1068                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1069                                 data->flags.crt = 1;
1070                                 break;
1071                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1072                                 data->flags.lcd = 1;
1073                                 break;
1074                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1075                                 data->flags.tvout = 1;
1076                                 break;
1077                         default:
1078                                 data->flags.unknown = 1;
1079                         }
1080                 }
1081
1082                 acpi_video_device_bind(video, data);
1083                 acpi_video_device_find_cap(data);
1084
1085                 status = acpi_install_notify_handler(device->handle,
1086                                                      ACPI_DEVICE_NOTIFY,
1087                                                      acpi_video_device_notify,
1088                                                      data);
1089                 if (ACPI_FAILURE(status)) {
1090                         printk(KERN_ERR PREFIX
1091                                           "Error installing notify handler\n");
1092                         if(data->brightness)
1093                                 kfree(data->brightness->levels);
1094                         kfree(data->brightness);
1095                         kfree(data);
1096                         return -ENODEV;
1097                 }
1098
1099                 mutex_lock(&video->device_list_lock);
1100                 list_add_tail(&data->entry, &video->video_device_list);
1101                 mutex_unlock(&video->device_list_lock);
1102
1103                 return 0;
1104         }
1105
1106         return -ENOENT;
1107 }
1108
1109 /*
1110  *  Arg:
1111  *      video   : video bus device
1112  *
1113  *  Return:
1114  *      none
1115  *
1116  *  Enumerate the video device list of the video bus,
1117  *  bind the ids with the corresponding video devices
1118  *  under the video bus.
1119  */
1120
1121 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1122 {
1123         struct acpi_video_device *dev;
1124
1125         mutex_lock(&video->device_list_lock);
1126
1127         list_for_each_entry(dev, &video->video_device_list, entry)
1128                 acpi_video_device_bind(video, dev);
1129
1130         mutex_unlock(&video->device_list_lock);
1131 }
1132
1133 /*
1134  *  Arg:
1135  *      video   : video bus device
1136  *      device  : video output device under the video
1137  *              bus
1138  *
1139  *  Return:
1140  *      none
1141  *
1142  *  Bind the ids with the corresponding video devices
1143  *  under the video bus.
1144  */
1145
1146 static void
1147 acpi_video_device_bind(struct acpi_video_bus *video,
1148                        struct acpi_video_device *device)
1149 {
1150         struct acpi_video_enumerated_device *ids;
1151         int i;
1152
1153         for (i = 0; i < video->attached_count; i++) {
1154                 ids = &video->attached_array[i];
1155                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1156                         ids->bind_info = device;
1157                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1158                 }
1159         }
1160 }
1161
1162 /*
1163  *  Arg:
1164  *      video   : video bus device
1165  *
1166  *  Return:
1167  *      < 0     : error
1168  *
1169  *  Call _DOD to enumerate all devices attached to display adapter
1170  *
1171  */
1172
1173 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1174 {
1175         int status;
1176         int count;
1177         int i;
1178         struct acpi_video_enumerated_device *active_list;
1179         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1180         union acpi_object *dod = NULL;
1181         union acpi_object *obj;
1182
1183         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1184         if (!ACPI_SUCCESS(status)) {
1185                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1186                 return status;
1187         }
1188
1189         dod = buffer.pointer;
1190         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1191                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1192                 status = -EFAULT;
1193                 goto out;
1194         }
1195
1196         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1197                           dod->package.count));
1198
1199         active_list = kcalloc(1 + dod->package.count,
1200                               sizeof(struct acpi_video_enumerated_device),
1201                               GFP_KERNEL);
1202         if (!active_list) {
1203                 status = -ENOMEM;
1204                 goto out;
1205         }
1206
1207         count = 0;
1208         for (i = 0; i < dod->package.count; i++) {
1209                 obj = &dod->package.elements[i];
1210
1211                 if (obj->type != ACPI_TYPE_INTEGER) {
1212                         printk(KERN_ERR PREFIX
1213                                 "Invalid _DOD data in element %d\n", i);
1214                         continue;
1215                 }
1216
1217                 active_list[count].value.int_val = obj->integer.value;
1218                 active_list[count].bind_info = NULL;
1219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1220                                   (int)obj->integer.value));
1221                 count++;
1222         }
1223
1224         kfree(video->attached_array);
1225
1226         video->attached_array = active_list;
1227         video->attached_count = count;
1228
1229  out:
1230         kfree(buffer.pointer);
1231         return status;
1232 }
1233
1234 static int
1235 acpi_video_get_next_level(struct acpi_video_device *device,
1236                           u32 level_current, u32 event)
1237 {
1238         int min, max, min_above, max_below, i, l, delta = 255;
1239         max = max_below = 0;
1240         min = min_above = 255;
1241         /* Find closest level to level_current */
1242         for (i = 2; i < device->brightness->count; i++) {
1243                 l = device->brightness->levels[i];
1244                 if (abs(l - level_current) < abs(delta)) {
1245                         delta = l - level_current;
1246                         if (!delta)
1247                                 break;
1248                 }
1249         }
1250         /* Ajust level_current to closest available level */
1251         level_current += delta;
1252         for (i = 2; i < device->brightness->count; i++) {
1253                 l = device->brightness->levels[i];
1254                 if (l < min)
1255                         min = l;
1256                 if (l > max)
1257                         max = l;
1258                 if (l < min_above && l > level_current)
1259                         min_above = l;
1260                 if (l > max_below && l < level_current)
1261                         max_below = l;
1262         }
1263
1264         switch (event) {
1265         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1266                 return (level_current < max) ? min_above : min;
1267         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1268                 return (level_current < max) ? min_above : max;
1269         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1270                 return (level_current > min) ? max_below : min;
1271         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1272         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1273                 return 0;
1274         default:
1275                 return level_current;
1276         }
1277 }
1278
1279 static int
1280 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1281 {
1282         unsigned long long level_current, level_next;
1283         int result = -EINVAL;
1284
1285         /* no warning message if acpi_backlight=vendor is used */
1286         if (!acpi_video_backlight_support())
1287                 return 0;
1288
1289         if (!device->brightness)
1290                 goto out;
1291
1292         result = acpi_video_device_lcd_get_level_current(device,
1293                                                          &level_current, 0);
1294         if (result)
1295                 goto out;
1296
1297         level_next = acpi_video_get_next_level(device, level_current, event);
1298
1299         result = acpi_video_device_lcd_set_level(device, level_next);
1300
1301         if (!result)
1302                 backlight_force_update(device->backlight,
1303                                        BACKLIGHT_UPDATE_HOTKEY);
1304
1305 out:
1306         if (result)
1307                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1308
1309         return result;
1310 }
1311
1312 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1313                         void **edid)
1314 {
1315         struct acpi_video_bus *video;
1316         struct acpi_video_device *video_device;
1317         union acpi_object *buffer = NULL;
1318         acpi_status status;
1319         int i, length;
1320
1321         if (!device || !acpi_driver_data(device))
1322                 return -EINVAL;
1323
1324         video = acpi_driver_data(device);
1325
1326         for (i = 0; i < video->attached_count; i++) {
1327                 video_device = video->attached_array[i].bind_info;
1328                 length = 256;
1329
1330                 if (!video_device)
1331                         continue;
1332
1333                 if (!video_device->cap._DDC)
1334                         continue;
1335
1336                 if (type) {
1337                         switch (type) {
1338                         case ACPI_VIDEO_DISPLAY_CRT:
1339                                 if (!video_device->flags.crt)
1340                                         continue;
1341                                 break;
1342                         case ACPI_VIDEO_DISPLAY_TV:
1343                                 if (!video_device->flags.tvout)
1344                                         continue;
1345                                 break;
1346                         case ACPI_VIDEO_DISPLAY_DVI:
1347                                 if (!video_device->flags.dvi)
1348                                         continue;
1349                                 break;
1350                         case ACPI_VIDEO_DISPLAY_LCD:
1351                                 if (!video_device->flags.lcd)
1352                                         continue;
1353                                 break;
1354                         }
1355                 } else if (video_device->device_id != device_id) {
1356                         continue;
1357                 }
1358
1359                 status = acpi_video_device_EDID(video_device, &buffer, length);
1360
1361                 if (ACPI_FAILURE(status) || !buffer ||
1362                     buffer->type != ACPI_TYPE_BUFFER) {
1363                         length = 128;
1364                         status = acpi_video_device_EDID(video_device, &buffer,
1365                                                         length);
1366                         if (ACPI_FAILURE(status) || !buffer ||
1367                             buffer->type != ACPI_TYPE_BUFFER) {
1368                                 continue;
1369                         }
1370                 }
1371
1372                 *edid = buffer->buffer.pointer;
1373                 return length;
1374         }
1375
1376         return -ENODEV;
1377 }
1378 EXPORT_SYMBOL(acpi_video_get_edid);
1379
1380 static int
1381 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1382                            struct acpi_device *device)
1383 {
1384         int status = 0;
1385         struct acpi_device *dev;
1386
1387         acpi_video_device_enumerate(video);
1388
1389         list_for_each_entry(dev, &device->children, node) {
1390
1391                 status = acpi_video_bus_get_one_device(dev, video);
1392                 if (ACPI_FAILURE(status)) {
1393                         printk(KERN_WARNING PREFIX
1394                                         "Can't attach device\n");
1395                         continue;
1396                 }
1397         }
1398         return status;
1399 }
1400
1401 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1402 {
1403         acpi_status status;
1404
1405         if (!device || !device->video)
1406                 return -ENOENT;
1407
1408         status = acpi_remove_notify_handler(device->dev->handle,
1409                                             ACPI_DEVICE_NOTIFY,
1410                                             acpi_video_device_notify);
1411         if (ACPI_FAILURE(status)) {
1412                 printk(KERN_WARNING PREFIX
1413                        "Can't remove video notify handler\n");
1414         }
1415         if (device->backlight) {
1416                 backlight_device_unregister(device->backlight);
1417                 device->backlight = NULL;
1418         }
1419         if (device->cooling_dev) {
1420                 sysfs_remove_link(&device->dev->dev.kobj,
1421                                   "thermal_cooling");
1422                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1423                                   "device");
1424                 thermal_cooling_device_unregister(device->cooling_dev);
1425                 device->cooling_dev = NULL;
1426         }
1427
1428         return 0;
1429 }
1430
1431 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1432 {
1433         int status;
1434         struct acpi_video_device *dev, *next;
1435
1436         mutex_lock(&video->device_list_lock);
1437
1438         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1439
1440                 status = acpi_video_bus_put_one_device(dev);
1441                 if (ACPI_FAILURE(status))
1442                         printk(KERN_WARNING PREFIX
1443                                "hhuuhhuu bug in acpi video driver.\n");
1444
1445                 if (dev->brightness) {
1446                         kfree(dev->brightness->levels);
1447                         kfree(dev->brightness);
1448                 }
1449                 list_del(&dev->entry);
1450                 kfree(dev);
1451         }
1452
1453         mutex_unlock(&video->device_list_lock);
1454
1455         return 0;
1456 }
1457
1458 /* acpi_video interface */
1459
1460 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1461 {
1462         return acpi_video_bus_DOS(video, 0, 0);
1463 }
1464
1465 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1466 {
1467         return acpi_video_bus_DOS(video, 0, 1);
1468 }
1469
1470 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1471 {
1472         struct acpi_video_bus *video = acpi_driver_data(device);
1473         struct input_dev *input;
1474         int keycode = 0;
1475
1476         if (!video)
1477                 return;
1478
1479         input = video->input;
1480
1481         switch (event) {
1482         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1483                                          * most likely via hotkey. */
1484                 acpi_bus_generate_proc_event(device, event, 0);
1485                 if (!acpi_notifier_call_chain(device, event, 0))
1486                         keycode = KEY_SWITCHVIDEOMODE;
1487                 break;
1488
1489         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1490                                          * connector. */
1491                 acpi_video_device_enumerate(video);
1492                 acpi_video_device_rebind(video);
1493                 acpi_bus_generate_proc_event(device, event, 0);
1494                 keycode = KEY_SWITCHVIDEOMODE;
1495                 break;
1496
1497         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1498                 acpi_bus_generate_proc_event(device, event, 0);
1499                 keycode = KEY_SWITCHVIDEOMODE;
1500                 break;
1501         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1502                 acpi_bus_generate_proc_event(device, event, 0);
1503                 keycode = KEY_VIDEO_NEXT;
1504                 break;
1505         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1506                 acpi_bus_generate_proc_event(device, event, 0);
1507                 keycode = KEY_VIDEO_PREV;
1508                 break;
1509
1510         default:
1511                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1512                                   "Unsupported event [0x%x]\n", event));
1513                 break;
1514         }
1515
1516         if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1517                 acpi_notifier_call_chain(device, event, 0);
1518
1519         if (keycode) {
1520                 input_report_key(input, keycode, 1);
1521                 input_sync(input);
1522                 input_report_key(input, keycode, 0);
1523                 input_sync(input);
1524         }
1525
1526         return;
1527 }
1528
1529 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1530 {
1531         struct acpi_video_device *video_device = data;
1532         struct acpi_device *device = NULL;
1533         struct acpi_video_bus *bus;
1534         struct input_dev *input;
1535         int keycode = 0;
1536
1537         if (!video_device)
1538                 return;
1539
1540         device = video_device->dev;
1541         bus = video_device->video;
1542         input = bus->input;
1543
1544         switch (event) {
1545         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
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_BRIGHTNESS_CYCLE;
1550                 break;
1551         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1552                 if (brightness_switch_enabled)
1553                         acpi_video_switch_brightness(video_device, event);
1554                 acpi_bus_generate_proc_event(device, event, 0);
1555                 keycode = KEY_BRIGHTNESSUP;
1556                 break;
1557         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1558                 if (brightness_switch_enabled)
1559                         acpi_video_switch_brightness(video_device, event);
1560                 acpi_bus_generate_proc_event(device, event, 0);
1561                 keycode = KEY_BRIGHTNESSDOWN;
1562                 break;
1563         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1564                 if (brightness_switch_enabled)
1565                         acpi_video_switch_brightness(video_device, event);
1566                 acpi_bus_generate_proc_event(device, event, 0);
1567                 keycode = KEY_BRIGHTNESS_ZERO;
1568                 break;
1569         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1570                 if (brightness_switch_enabled)
1571                         acpi_video_switch_brightness(video_device, event);
1572                 acpi_bus_generate_proc_event(device, event, 0);
1573                 keycode = KEY_DISPLAY_OFF;
1574                 break;
1575         default:
1576                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1577                                   "Unsupported event [0x%x]\n", event));
1578                 break;
1579         }
1580
1581         acpi_notifier_call_chain(device, event, 0);
1582
1583         if (keycode) {
1584                 input_report_key(input, keycode, 1);
1585                 input_sync(input);
1586                 input_report_key(input, keycode, 0);
1587                 input_sync(input);
1588         }
1589
1590         return;
1591 }
1592
1593 static int acpi_video_resume(struct notifier_block *nb,
1594                                 unsigned long val, void *ign)
1595 {
1596         struct acpi_video_bus *video;
1597         struct acpi_video_device *video_device;
1598         int i;
1599
1600         switch (val) {
1601         case PM_HIBERNATION_PREPARE:
1602         case PM_SUSPEND_PREPARE:
1603         case PM_RESTORE_PREPARE:
1604                 return NOTIFY_DONE;
1605         }
1606
1607         video = container_of(nb, struct acpi_video_bus, pm_nb);
1608
1609         dev_info(&video->device->dev, "Restoring backlight state\n");
1610
1611         for (i = 0; i < video->attached_count; i++) {
1612                 video_device = video->attached_array[i].bind_info;
1613                 if (video_device && video_device->backlight)
1614                         acpi_video_set_brightness(video_device->backlight);
1615         }
1616
1617         return NOTIFY_OK;
1618 }
1619
1620 static acpi_status
1621 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1622                         void **return_value)
1623 {
1624         struct acpi_device *device = context;
1625         struct acpi_device *sibling;
1626         int result;
1627
1628         if (handle == device->handle)
1629                 return AE_CTRL_TERMINATE;
1630
1631         result = acpi_bus_get_device(handle, &sibling);
1632         if (result)
1633                 return AE_OK;
1634
1635         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1636                         return AE_ALREADY_EXISTS;
1637
1638         return AE_OK;
1639 }
1640
1641 static int instance;
1642
1643 static int acpi_video_bus_add(struct acpi_device *device)
1644 {
1645         struct acpi_video_bus *video;
1646         struct input_dev *input;
1647         int error;
1648         acpi_status status;
1649
1650         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1651                                 device->parent->handle, 1,
1652                                 acpi_video_bus_match, NULL,
1653                                 device, NULL);
1654         if (status == AE_ALREADY_EXISTS) {
1655                 printk(KERN_WARNING FW_BUG
1656                         "Duplicate ACPI video bus devices for the"
1657                         " same VGA controller, please try module "
1658                         "parameter \"video.allow_duplicates=1\""
1659                         "if the current driver doesn't work.\n");
1660                 if (!allow_duplicates)
1661                         return -ENODEV;
1662         }
1663
1664         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1665         if (!video)
1666                 return -ENOMEM;
1667
1668         /* a hack to fix the duplicate name "VID" problem on T61 */
1669         if (!strcmp(device->pnp.bus_id, "VID")) {
1670                 if (instance)
1671                         device->pnp.bus_id[3] = '0' + instance;
1672                 instance ++;
1673         }
1674         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1675         if (!strcmp(device->pnp.bus_id, "VGA")) {
1676                 if (instance)
1677                         device->pnp.bus_id[3] = '0' + instance;
1678                 instance++;
1679         }
1680
1681         video->device = device;
1682         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1683         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1684         device->driver_data = video;
1685
1686         acpi_video_bus_find_cap(video);
1687         error = acpi_video_bus_check(video);
1688         if (error)
1689                 goto err_free_video;
1690
1691         mutex_init(&video->device_list_lock);
1692         INIT_LIST_HEAD(&video->video_device_list);
1693
1694         acpi_video_bus_get_devices(video, device);
1695         acpi_video_bus_start_devices(video);
1696
1697         video->input = input = input_allocate_device();
1698         if (!input) {
1699                 error = -ENOMEM;
1700                 goto err_stop_video;
1701         }
1702
1703         snprintf(video->phys, sizeof(video->phys),
1704                 "%s/video/input0", acpi_device_hid(video->device));
1705
1706         input->name = acpi_device_name(video->device);
1707         input->phys = video->phys;
1708         input->id.bustype = BUS_HOST;
1709         input->id.product = 0x06;
1710         input->dev.parent = &device->dev;
1711         input->evbit[0] = BIT(EV_KEY);
1712         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1713         set_bit(KEY_VIDEO_NEXT, input->keybit);
1714         set_bit(KEY_VIDEO_PREV, input->keybit);
1715         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1716         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1717         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1718         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1719         set_bit(KEY_DISPLAY_OFF, input->keybit);
1720
1721         error = input_register_device(input);
1722         if (error)
1723                 goto err_free_input_dev;
1724
1725         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1726                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1727                video->flags.multihead ? "yes" : "no",
1728                video->flags.rom ? "yes" : "no",
1729                video->flags.post ? "yes" : "no");
1730
1731         video->pm_nb.notifier_call = acpi_video_resume;
1732         video->pm_nb.priority = 0;
1733         register_pm_notifier(&video->pm_nb);
1734
1735         return 0;
1736
1737  err_free_input_dev:
1738         input_free_device(input);
1739  err_stop_video:
1740         acpi_video_bus_stop_devices(video);
1741         acpi_video_bus_put_devices(video);
1742         kfree(video->attached_array);
1743  err_free_video:
1744         kfree(video);
1745         device->driver_data = NULL;
1746
1747         return error;
1748 }
1749
1750 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1751 {
1752         struct acpi_video_bus *video = NULL;
1753
1754
1755         if (!device || !acpi_driver_data(device))
1756                 return -EINVAL;
1757
1758         video = acpi_driver_data(device);
1759
1760         unregister_pm_notifier(&video->pm_nb);
1761
1762         acpi_video_bus_stop_devices(video);
1763         acpi_video_bus_put_devices(video);
1764
1765         input_unregister_device(video->input);
1766         kfree(video->attached_array);
1767         kfree(video);
1768
1769         return 0;
1770 }
1771
1772 static int __init intel_opregion_present(void)
1773 {
1774 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1775         struct pci_dev *dev = NULL;
1776         u32 address;
1777
1778         for_each_pci_dev(dev) {
1779                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1780                         continue;
1781                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1782                         continue;
1783                 pci_read_config_dword(dev, 0xfc, &address);
1784                 if (!address)
1785                         continue;
1786                 return 1;
1787         }
1788 #endif
1789         return 0;
1790 }
1791
1792 int acpi_video_register(void)
1793 {
1794         int result = 0;
1795         if (register_count) {
1796                 /*
1797                  * if the function of acpi_video_register is already called,
1798                  * don't register the acpi_vide_bus again and return no error.
1799                  */
1800                 return 0;
1801         }
1802
1803         result = acpi_bus_register_driver(&acpi_video_bus);
1804         if (result < 0)
1805                 return -ENODEV;
1806
1807         /*
1808          * When the acpi_video_bus is loaded successfully, increase
1809          * the counter reference.
1810          */
1811         register_count = 1;
1812
1813         return 0;
1814 }
1815 EXPORT_SYMBOL(acpi_video_register);
1816
1817 void acpi_video_unregister(void)
1818 {
1819         if (!register_count) {
1820                 /*
1821                  * If the acpi video bus is already unloaded, don't
1822                  * unload it again and return directly.
1823                  */
1824                 return;
1825         }
1826         acpi_bus_unregister_driver(&acpi_video_bus);
1827
1828         register_count = 0;
1829
1830         return;
1831 }
1832 EXPORT_SYMBOL(acpi_video_unregister);
1833
1834 /*
1835  * This is kind of nasty. Hardware using Intel chipsets may require
1836  * the video opregion code to be run first in order to initialise
1837  * state before any ACPI video calls are made. To handle this we defer
1838  * registration of the video class until the opregion code has run.
1839  */
1840
1841 static int __init acpi_video_init(void)
1842 {
1843         dmi_check_system(video_dmi_table);
1844
1845         if (intel_opregion_present())
1846                 return 0;
1847
1848         return acpi_video_register();
1849 }
1850
1851 static void __exit acpi_video_exit(void)
1852 {
1853         acpi_video_unregister();
1854
1855         return;
1856 }
1857
1858 module_init(acpi_video_init);
1859 module_exit(acpi_video_exit);