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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_VIDEO_CLASS                "video"
  48 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  49 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  50 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  51 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  52 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  55
  56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  61
  62 #define MAX_NAME_LEN    20
  63
  64 #define ACPI_VIDEO_DISPLAY_CRT  1
  65 #define ACPI_VIDEO_DISPLAY_TV   2
  66 #define ACPI_VIDEO_DISPLAY_DVI  3
  67 #define ACPI_VIDEO_DISPLAY_LCD  4
  68
  69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  70 ACPI_MODULE_NAME("video");
  71
  72 MODULE_AUTHOR("Bruno Ducrot");
  73 MODULE_DESCRIPTION("ACPI Video Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int brightness_switch_enabled = 1;
  77 module_param(brightness_switch_enabled, bool, 0644);
  78
  79 static int acpi_video_bus_add(struct acpi_device *device);
  80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  81 static int acpi_video_resume(struct acpi_device *device);
  82 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  83
  84 static const struct acpi_device_id video_device_ids[] = {
  85         {ACPI_VIDEO_HID, 0},
  86         {"", 0},
  87 };
  88 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  89
  90 static struct acpi_driver acpi_video_bus = {
  91         .name = "video",
  92         .class = ACPI_VIDEO_CLASS,
  93         .ids = video_device_ids,
  94         .ops = {
  95                 .add = acpi_video_bus_add,
  96                 .remove = acpi_video_bus_remove,
  97                 .resume = acpi_video_resume,
  98                 .notify = acpi_video_bus_notify,
  99                 },
 100 };
 101
 102 struct acpi_video_bus_flags {
 103         u8 multihead:1;         /* can switch video heads */
 104         u8 rom:1;               /* can retrieve a video rom */
 105         u8 post:1;              /* can configure the head to */
 106         u8 reserved:5;
 107 };
 108
 109 struct acpi_video_bus_cap {
 110         u8 _DOS:1;              /*Enable/Disable output switching */
 111         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 112         u8 _ROM:1;              /*Get ROM Data */
 113         u8 _GPD:1;              /*Get POST Device */
 114         u8 _SPD:1;              /*Set POST Device */
 115         u8 _VPO:1;              /*Video POST Options */
 116         u8 reserved:2;
 117 };
 118
 119 struct acpi_video_device_attrib {
 120         u32 display_index:4;    /* A zero-based instance of the Display */
 121         u32 display_port_attachment:4;  /*This field differentiates the display type */
 122         u32 display_type:4;     /*Describe the specific type in use */
 123         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 124         u32 bios_can_detect:1;  /*BIOS can detect the device */
 125         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 126                                    the VGA device. */
 127         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 128         u32 reserved:10;        /*Must be 0 */
 129         u32 device_id_scheme:1; /*Device ID Scheme */
 130 };
 131
 132 struct acpi_video_enumerated_device {
 133         union {
 134                 u32 int_val;
 135                 struct acpi_video_device_attrib attrib;
 136         } value;
 137         struct acpi_video_device *bind_info;
 138 };
 139
 140 struct acpi_video_bus {
 141         struct acpi_device *device;
 142         u8 dos_setting;
 143         struct acpi_video_enumerated_device *attached_array;
 144         u8 attached_count;
 145         struct acpi_video_bus_cap cap;
 146         struct acpi_video_bus_flags flags;
 147         struct list_head video_device_list;
 148         struct mutex device_list_lock;  /* protects video_device_list */
 149         struct proc_dir_entry *dir;
 150         struct input_dev *input;
 151         char phys[32];  /* for input device */
 152 };
 153
 154 struct acpi_video_device_flags {
 155         u8 crt:1;
 156         u8 lcd:1;
 157         u8 tvout:1;
 158         u8 dvi:1;
 159         u8 bios:1;
 160         u8 unknown:1;
 161         u8 reserved:2;
 162 };
 163
 164 struct acpi_video_device_cap {
 165         u8 _ADR:1;              /*Return the unique ID */
 166         u8 _BCL:1;              /*Query list of brightness control levels supported */
 167         u8 _BCM:1;              /*Set the brightness level */
 168         u8 _BQC:1;              /* Get current brightness level */
 169         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 170         u8 _DDC:1;              /*Return the EDID for this device */
 171         u8 _DCS:1;              /*Return status of output device */
 172         u8 _DGS:1;              /*Query graphics state */
 173         u8 _DSS:1;              /*Device state set */
 174 };
 175
 176 struct acpi_video_brightness_flags {
 177         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 178         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 179         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 180         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 181         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 182 };
 183
 184 struct acpi_video_device_brightness {
 185         int curr;
 186         int count;
 187         int *levels;
 188         struct acpi_video_brightness_flags flags;
 189 };
 190
 191 struct acpi_video_device {
 192         unsigned long device_id;
 193         struct acpi_video_device_flags flags;
 194         struct acpi_video_device_cap cap;
 195         struct list_head entry;
 196         struct acpi_video_bus *video;
 197         struct acpi_device *dev;
 198         struct acpi_video_device_brightness *brightness;
 199         struct backlight_device *backlight;
 200         struct thermal_cooling_device *cdev;
 201         struct output_device *output_dev;
 202 };
 203
 204 /* bus */
 205 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 206 static const struct file_operations acpi_video_bus_info_fops = {
 207         .owner = THIS_MODULE,
 208         .open = acpi_video_bus_info_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 215 static const struct file_operations acpi_video_bus_ROM_fops = {
 216         .owner = THIS_MODULE,
 217         .open = acpi_video_bus_ROM_open_fs,
 218         .read = seq_read,
 219         .llseek = seq_lseek,
 220         .release = single_release,
 221 };
 222
 223 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 224                                             struct file *file);
 225 static const struct file_operations acpi_video_bus_POST_info_fops = {
 226         .owner = THIS_MODULE,
 227         .open = acpi_video_bus_POST_info_open_fs,
 228         .read = seq_read,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 234 static ssize_t acpi_video_bus_write_POST(struct file *file,
 235         const char __user *buffer, size_t count, loff_t *data);
 236 static const struct file_operations acpi_video_bus_POST_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_video_bus_POST_open_fs,
 239         .read = seq_read,
 240         .write = acpi_video_bus_write_POST,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 246 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 247         const char __user *buffer, size_t count, loff_t *data);
 248 static const struct file_operations acpi_video_bus_DOS_fops = {
 249         .owner = THIS_MODULE,
 250         .open = acpi_video_bus_DOS_open_fs,
 251         .read = seq_read,
 252         .write = acpi_video_bus_write_DOS,
 253         .llseek = seq_lseek,
 254         .release = single_release,
 255 };
 256
 257 /* device */
 258 static int acpi_video_device_info_open_fs(struct inode *inode,
 259                                           struct file *file);
 260 static const struct file_operations acpi_video_device_info_fops = {
 261         .owner = THIS_MODULE,
 262         .open = acpi_video_device_info_open_fs,
 263         .read = seq_read,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 static int acpi_video_device_state_open_fs(struct inode *inode,
 269                                            struct file *file);
 270 static ssize_t acpi_video_device_write_state(struct file *file,
 271         const char __user *buffer, size_t count, loff_t *data);
 272 static const struct file_operations acpi_video_device_state_fops = {
 273         .owner = THIS_MODULE,
 274         .open = acpi_video_device_state_open_fs,
 275         .read = seq_read,
 276         .write = acpi_video_device_write_state,
 277         .llseek = seq_lseek,
 278         .release = single_release,
 279 };
 280
 281 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 282                                                 struct file *file);
 283 static ssize_t acpi_video_device_write_brightness(struct file *file,
 284         const char __user *buffer, size_t count, loff_t *data);
 285 static struct file_operations acpi_video_device_brightness_fops = {
 286         .owner = THIS_MODULE,
 287         .open = acpi_video_device_brightness_open_fs,
 288         .read = seq_read,
 289         .write = acpi_video_device_write_brightness,
 290         .llseek = seq_lseek,
 291         .release = single_release,
 292 };
 293
 294 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 295                                           struct file *file);
 296 static const struct file_operations acpi_video_device_EDID_fops = {
 297         .owner = THIS_MODULE,
 298         .open = acpi_video_device_EDID_open_fs,
 299         .read = seq_read,
 300         .llseek = seq_lseek,
 301         .release = single_release,
 302 };
 303
 304 static const char device_decode[][30] = {
 305         "motherboard VGA device",
 306         "PCI VGA device",
 307         "AGP VGA device",
 308         "UNKNOWN",
 309 };
 310
 311 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 312 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 313 static void acpi_video_device_bind(struct acpi_video_bus *video,
 314                                    struct acpi_video_device *device);
 315 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 316 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 317                         int level);
 318 static int acpi_video_device_lcd_get_level_current(
 319                         struct acpi_video_device *device,
 320                         unsigned long long *level);
 321 static int acpi_video_get_next_level(struct acpi_video_device *device,
 322                                      u32 level_current, u32 event);
 323 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 324                                          int event);
 325 static int acpi_video_device_get_state(struct acpi_video_device *device,
 326                             unsigned long long *state);
 327 static int acpi_video_output_get(struct output_device *od);
 328 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 329
 330 /*backlight device sysfs support*/
 331 static int acpi_video_get_brightness(struct backlight_device *bd)
 332 {
 333         unsigned long long cur_level;
 334         int i;
 335         struct acpi_video_device *vd =
 336                 (struct acpi_video_device *)bl_get_data(bd);
 337
 338         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 339                 return -EINVAL;
 340         for (i = 2; i < vd->brightness->count; i++) {
 341                 if (vd->brightness->levels[i] == cur_level)
 342                         /* The first two entries are special - see page 575
 343                            of the ACPI spec 3.0 */
 344                         return i-2;
 345         }
 346         return 0;
 347 }
 348
 349 static int acpi_video_set_brightness(struct backlight_device *bd)
 350 {
 351         int request_level = bd->props.brightness + 2;
 352         struct acpi_video_device *vd =
 353                 (struct acpi_video_device *)bl_get_data(bd);
 354
 355         return acpi_video_device_lcd_set_level(vd,
 356                                 vd->brightness->levels[request_level]);
 357 }
 358
 359 static struct backlight_ops acpi_backlight_ops = {
 360         .get_brightness = acpi_video_get_brightness,
 361         .update_status  = acpi_video_set_brightness,
 362 };
 363
 364 /*video output device sysfs support*/
 365 static int acpi_video_output_get(struct output_device *od)
 366 {
 367         unsigned long long state;
 368         struct acpi_video_device *vd =
 369                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 370         acpi_video_device_get_state(vd, &state);
 371         return (int)state;
 372 }
 373
 374 static int acpi_video_output_set(struct output_device *od)
 375 {
 376         unsigned long state = od->request_state;
 377         struct acpi_video_device *vd=
 378                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 379         return acpi_video_device_set_state(vd, state);
 380 }
 381
 382 static struct output_properties acpi_output_properties = {
 383         .set_state = acpi_video_output_set,
 384         .get_status = acpi_video_output_get,
 385 };
 386
 387
 388 /* thermal cooling device callbacks */
 389 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
 390                                long *state)
 391 {
 392         struct acpi_device *device = cdev->devdata;
 393         struct acpi_video_device *video = acpi_driver_data(device);
 394
 395         *state = video->brightness->count - 3;
 396         return 0;
 397 }
 398
 399 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
 400                                long *state)
 401 {
 402         struct acpi_device *device = cdev->devdata;
 403         struct acpi_video_device *video = acpi_driver_data(device);
 404         unsigned long long level;
 405         int offset;
 406
 407         if (acpi_video_device_lcd_get_level_current(video, &level))
 408                 return -EINVAL;
 409         for (offset = 2; offset < video->brightness->count; offset++)
 410                 if (level == video->brightness->levels[offset]) {
 411                         *state = video->brightness->count - offset - 1;
 412                         return 0;
 413                 }
 414
 415         return -EINVAL;
 416 }
 417
 418 static int
 419 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 420 {
 421         struct acpi_device *device = cdev->devdata;
 422         struct acpi_video_device *video = acpi_driver_data(device);
 423         int level;
 424
 425         if ( state >= video->brightness->count - 2)
 426                 return -EINVAL;
 427
 428         state = video->brightness->count - state;
 429         level = video->brightness->levels[state -1];
 430         return acpi_video_device_lcd_set_level(video, level);
 431 }
 432
 433 static struct thermal_cooling_device_ops video_cooling_ops = {
 434         .get_max_state = video_get_max_state,
 435         .get_cur_state = video_get_cur_state,
 436         .set_cur_state = video_set_cur_state,
 437 };
 438
 439 /* --------------------------------------------------------------------------
 440                                Video Management
 441    -------------------------------------------------------------------------- */
 442
 443 /* device */
 444
 445 static int
 446 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 447 {
 448         int status;
 449
 450         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 451
 452         return status;
 453 }
 454
 455 static int
 456 acpi_video_device_get_state(struct acpi_video_device *device,
 457                             unsigned long long *state)
 458 {
 459         int status;
 460
 461         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 462
 463         return status;
 464 }
 465
 466 static int
 467 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 468 {
 469         int status;
 470         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 471         struct acpi_object_list args = { 1, &arg0 };
 472         unsigned long long ret;
 473
 474
 475         arg0.integer.value = state;
 476         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 477
 478         return status;
 479 }
 480
 481 static int
 482 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 483                                    union acpi_object **levels)
 484 {
 485         int status;
 486         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 487         union acpi_object *obj;
 488
 489
 490         *levels = NULL;
 491
 492         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 493         if (!ACPI_SUCCESS(status))
 494                 return status;
 495         obj = (union acpi_object *)buffer.pointer;
 496         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 497                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 498                 status = -EFAULT;
 499                 goto err;
 500         }
 501
 502         *levels = obj;
 503
 504         return 0;
 505
 506       err:
 507         kfree(buffer.pointer);
 508
 509         return status;
 510 }
 511
 512 static int
 513 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 514 {
 515         int status;
 516         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 517         struct acpi_object_list args = { 1, &arg0 };
 518         int state;
 519
 520         arg0.integer.value = level;
 521
 522         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 523                                       &args, NULL);
 524         if (ACPI_FAILURE(status)) {
 525                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 526                 return -EIO;
 527         }
 528
 529         device->brightness->curr = level;
 530         for (state = 2; state < device->brightness->count; state++)
 531                 if (level == device->brightness->levels[state]) {
 532                         if (device->backlight)
 533                                 device->backlight->props.brightness = state - 2;
 534                         return 0;
 535                 }
 536
 537         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 538         return -EINVAL;
 539 }
 540
 541 /*
 542  * For some buggy _BQC methods, we need to add a constant value to
 543  * the _BQC return value to get the actual current brightness level
 544  */
 545
 546 static int bqc_offset_aml_bug_workaround;
 547 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 548 {
 549         bqc_offset_aml_bug_workaround = 9;
 550         return 0;
 551 }
 552
 553 static struct dmi_system_id video_dmi_table[] __initdata = {
 554         /*
 555          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 556          */
 557         {
 558          .callback = video_set_bqc_offset,
 559          .ident = "Acer Aspire 5720",
 560          .matches = {
 561                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 562                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 563                 },
 564         },
 565         {
 566          .callback = video_set_bqc_offset,
 567          .ident = "Acer Aspire 5710Z",
 568          .matches = {
 569                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 570                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 571                 },
 572         },
 573         {
 574          .callback = video_set_bqc_offset,
 575          .ident = "eMachines E510",
 576          .matches = {
 577                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 578                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 579                 },
 580         },
 581         {
 582          .callback = video_set_bqc_offset,
 583          .ident = "Acer Aspire 5315",
 584          .matches = {
 585                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 586                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 587                 },
 588         },
 589         {}
 590 };
 591
 592 static int
 593 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 594                                         unsigned long long *level)
 595 {
 596         acpi_status status = AE_OK;
 597
 598         if (device->cap._BQC || device->cap._BCQ) {
 599                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 600
 601                 status = acpi_evaluate_integer(device->dev->handle, buf,
 602                                                 NULL, level);
 603                 if (ACPI_SUCCESS(status)) {
 604                         if (device->brightness->flags._BQC_use_index) {
 605                                 if (device->brightness->flags._BCL_reversed)
 606                                         *level = device->brightness->count
 607                                                                  - 3 - (*level);
 608                                 *level = device->brightness->levels[*level + 2];
 609
 610                         }
 611                         *level += bqc_offset_aml_bug_workaround;
 612                         device->brightness->curr = *level;
 613                         return 0;
 614                 } else {
 615                         /* Fixme:
 616                          * should we return an error or ignore this failure?
 617                          * dev->brightness->curr is a cached value which stores
 618                          * the correct current backlight level in most cases.
 619                          * ACPI video backlight still works w/ buggy _BQC.
 620                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 621                          */
 622                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 623                         device->cap._BQC = device->cap._BCQ = 0;
 624                 }
 625         }
 626
 627         *level = device->brightness->curr;
 628         return 0;
 629 }
 630
 631 static int
 632 acpi_video_device_EDID(struct acpi_video_device *device,
 633                        union acpi_object **edid, ssize_t length)
 634 {
 635         int status;
 636         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 637         union acpi_object *obj;
 638         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 639         struct acpi_object_list args = { 1, &arg0 };
 640
 641
 642         *edid = NULL;
 643
 644         if (!device)
 645                 return -ENODEV;
 646         if (length == 128)
 647                 arg0.integer.value = 1;
 648         else if (length == 256)
 649                 arg0.integer.value = 2;
 650         else
 651                 return -EINVAL;
 652
 653         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 654         if (ACPI_FAILURE(status))
 655                 return -ENODEV;
 656
 657         obj = buffer.pointer;
 658
 659         if (obj && obj->type == ACPI_TYPE_BUFFER)
 660                 *edid = obj;
 661         else {
 662                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 663                 status = -EFAULT;
 664                 kfree(obj);
 665         }
 666
 667         return status;
 668 }
 669
 670 /* bus */
 671
 672 static int
 673 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 674 {
 675         int status;
 676         unsigned long long tmp;
 677         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 678         struct acpi_object_list args = { 1, &arg0 };
 679
 680
 681         arg0.integer.value = option;
 682
 683         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 684         if (ACPI_SUCCESS(status))
 685                 status = tmp ? (-EINVAL) : (AE_OK);
 686
 687         return status;
 688 }
 689
 690 static int
 691 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 692 {
 693         int status;
 694
 695         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 696
 697         return status;
 698 }
 699
 700 static int
 701 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 702                             unsigned long long *options)
 703 {
 704         int status;
 705
 706         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 707         *options &= 3;
 708
 709         return status;
 710 }
 711
 712 /*
 713  *  Arg:
 714  *      video           : video bus device pointer
 715  *      bios_flag       :
 716  *              0.      The system BIOS should NOT automatically switch(toggle)
 717  *                      the active display output.
 718  *              1.      The system BIOS should automatically switch (toggle) the
 719  *                      active display output. No switch event.
 720  *              2.      The _DGS value should be locked.
 721  *              3.      The system BIOS should not automatically switch (toggle) the
 722  *                      active display output, but instead generate the display switch
 723  *                      event notify code.
 724  *      lcd_flag        :
 725  *              0.      The system BIOS should automatically control the brightness level
 726  *                      of the LCD when the power changes from AC to DC
 727  *              1.      The system BIOS should NOT automatically control the brightness
 728  *                      level of the LCD when the power changes from AC to DC.
 729  * Return Value:
 730  *              -1      wrong arg.
 731  */
 732
 733 static int
 734 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 735 {
 736         acpi_integer status = 0;
 737         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 738         struct acpi_object_list args = { 1, &arg0 };
 739
 740
 741         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 742                 status = -1;
 743                 goto Failed;
 744         }
 745         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 746         video->dos_setting = arg0.integer.value;
 747         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 748
 749       Failed:
 750         return status;
 751 }
 752
 753 /*
 754  * Simple comparison function used to sort backlight levels.
 755  */
 756
 757 static int
 758 acpi_video_cmp_level(const void *a, const void *b)
 759 {
 760         return *(int *)a - *(int *)b;
 761 }
 762
 763 /*
 764  *  Arg:
 765  *      device  : video output device (LCD, CRT, ..)
 766  *
 767  *  Return Value:
 768  *      Maximum brightness level
 769  *
 770  *  Allocate and initialize device->brightness.
 771  */
 772
 773 static int
 774 acpi_video_init_brightness(struct acpi_video_device *device)
 775 {
 776         union acpi_object *obj = NULL;
 777         int i, max_level = 0, count = 0, level_ac_battery = 0;
 778         unsigned long long level, level_old;
 779         union acpi_object *o;
 780         struct acpi_video_device_brightness *br = NULL;
 781         int result = -EINVAL;
 782
 783         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 784                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 785                                                 "LCD brightness level\n"));
 786                 goto out;
 787         }
 788
 789         if (obj->package.count < 2)
 790                 goto out;
 791
 792         br = kzalloc(sizeof(*br), GFP_KERNEL);
 793         if (!br) {
 794                 printk(KERN_ERR "can't allocate memory\n");
 795                 result = -ENOMEM;
 796                 goto out;
 797         }
 798
 799         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 800                                 GFP_KERNEL);
 801         if (!br->levels) {
 802                 result = -ENOMEM;
 803                 goto out_free;
 804         }
 805
 806         for (i = 0; i < obj->package.count; i++) {
 807                 o = (union acpi_object *)&obj->package.elements[i];
 808                 if (o->type != ACPI_TYPE_INTEGER) {
 809                         printk(KERN_ERR PREFIX "Invalid data\n");
 810                         continue;
 811                 }
 812                 br->levels[count] = (u32) o->integer.value;
 813
 814                 if (br->levels[count] > max_level)
 815                         max_level = br->levels[count];
 816                 count++;
 817         }
 818
 819         /*
 820          * some buggy BIOS don't export the levels
 821          * when machine is on AC/Battery in _BCL package.
 822          * In this case, the first two elements in _BCL packages
 823          * are also supported brightness levels that OS should take care of.
 824          */
 825         for (i = 2; i < count; i++) {
 826                 if (br->levels[i] == br->levels[0])
 827                         level_ac_battery++;
 828                 if (br->levels[i] == br->levels[1])
 829                         level_ac_battery++;
 830         }
 831
 832         if (level_ac_battery < 2) {
 833                 level_ac_battery = 2 - level_ac_battery;
 834                 br->flags._BCL_no_ac_battery_levels = 1;
 835                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 836                         br->levels[i] = br->levels[i - level_ac_battery];
 837                 count += level_ac_battery;
 838         } else if (level_ac_battery > 2)
 839                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 840
 841         /* Check if the _BCL package is in a reversed order */
 842         if (max_level == br->levels[2]) {
 843                 br->flags._BCL_reversed = 1;
 844                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 845                         acpi_video_cmp_level, NULL);
 846         } else if (max_level != br->levels[count - 1])
 847                 ACPI_ERROR((AE_INFO,
 848                             "Found unordered _BCL package\n"));
 849
 850         br->count = count;
 851         device->brightness = br;
 852
 853         /* Check the input/output of _BQC/_BCL/_BCM */
 854         if ((max_level < 100) && (max_level <= (count - 2)))
 855                 br->flags._BCL_use_index = 1;
 856
 857         /*
 858          * _BCM is always consistent with _BCL,
 859          * at least for all the laptops we have ever seen.
 860          */
 861         br->flags._BCM_use_index = br->flags._BCL_use_index;
 862
 863         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 864         br->curr = level_old = max_level;
 865
 866         if (!device->cap._BQC)
 867                 goto set_level;
 868
 869         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 870         if (result)
 871                 goto out_free_levels;
 872
 873         /*
 874          * Set the level to maximum and check if _BQC uses indexed value
 875          */
 876         result = acpi_video_device_lcd_set_level(device, max_level);
 877         if (result)
 878                 goto out_free_levels;
 879
 880         result = acpi_video_device_lcd_get_level_current(device, &level);
 881         if (result)
 882                 goto out_free_levels;
 883
 884         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 885
 886         if (!br->flags._BQC_use_index)
 887                 goto set_level;
 888
 889         if (br->flags._BCL_reversed)
 890                 level_old = (br->count - 1) - level_old;
 891         level_old = br->levels[level_old];
 892
 893 set_level:
 894         result = acpi_video_device_lcd_set_level(device, level_old);
 895         if (result)
 896                 goto out_free_levels;
 897
 898         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 899                           "found %d brightness levels\n", count - 2));
 900         kfree(obj);
 901         return result;
 902
 903 out_free_levels:
 904         kfree(br->levels);
 905 out_free:
 906         kfree(br);
 907 out:
 908         device->brightness = NULL;
 909         kfree(obj);
 910         return result;
 911 }
 912
 913 /*
 914  *  Arg:
 915  *      device  : video output device (LCD, CRT, ..)
 916  *
 917  *  Return Value:
 918  *      None
 919  *
 920  *  Find out all required AML methods defined under the output
 921  *  device.
 922  */
 923
 924 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 925 {
 926         acpi_handle h_dummy1;
 927
 928
 929         memset(&device->cap, 0, sizeof(device->cap));
 930
 931         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 932                 device->cap._ADR = 1;
 933         }
 934         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 935                 device->cap._BCL = 1;
 936         }
 937         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 938                 device->cap._BCM = 1;
 939         }
 940         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 941                 device->cap._BQC = 1;
 942         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 943                                 &h_dummy1))) {
 944                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 945                 device->cap._BCQ = 1;
 946         }
 947
 948         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 949                 device->cap._DDC = 1;
 950         }
 951         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 952                 device->cap._DCS = 1;
 953         }
 954         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 955                 device->cap._DGS = 1;
 956         }
 957         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 958                 device->cap._DSS = 1;
 959         }
 960
 961         if (acpi_video_backlight_support()) {
 962                 int result;
 963                 static int count = 0;
 964                 char *name;
 965
 966                 result = acpi_video_init_brightness(device);
 967                 if (result)
 968                         return;
 969                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 970                 if (!name)
 971                         return;
 972
 973                 sprintf(name, "acpi_video%d", count++);
 974                 device->backlight = backlight_device_register(name,
 975                         NULL, device, &acpi_backlight_ops);
 976                 device->backlight->props.max_brightness = device->brightness->count-3;
 977                 kfree(name);
 978
 979                 device->cdev = thermal_cooling_device_register("LCD",
 980                                         device->dev, &video_cooling_ops);
 981                 if (IS_ERR(device->cdev))
 982                         return;
 983
 984                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 985                          device->cdev->id);
 986                 result = sysfs_create_link(&device->dev->dev.kobj,
 987                                 &device->cdev->device.kobj,
 988                                 "thermal_cooling");
 989                 if (result)
 990                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 991                 result = sysfs_create_link(&device->cdev->device.kobj,
 992                                 &device->dev->dev.kobj, "device");
 993                 if (result)
 994                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 995
 996         }
 997
 998         if (acpi_video_display_switch_support()) {
 999
1000                 if (device->cap._DCS && device->cap._DSS) {
1001                         static int count;
1002                         char *name;
1003                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1004                         if (!name)
1005                                 return;
1006                         sprintf(name, "acpi_video%d", count++);
1007                         device->output_dev = video_output_register(name,
1008                                         NULL, device, &acpi_output_properties);
1009                         kfree(name);
1010                 }
1011         }
1012 }
1013
1014 /*
1015  *  Arg:
1016  *      device  : video output device (VGA)
1017  *
1018  *  Return Value:
1019  *      None
1020  *
1021  *  Find out all required AML methods defined under the video bus device.
1022  */
1023
1024 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1025 {
1026         acpi_handle h_dummy1;
1027
1028         memset(&video->cap, 0, sizeof(video->cap));
1029         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1030                 video->cap._DOS = 1;
1031         }
1032         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1033                 video->cap._DOD = 1;
1034         }
1035         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1036                 video->cap._ROM = 1;
1037         }
1038         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1039                 video->cap._GPD = 1;
1040         }
1041         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1042                 video->cap._SPD = 1;
1043         }
1044         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1045                 video->cap._VPO = 1;
1046         }
1047 }
1048
1049 /*
1050  * Check whether the video bus device has required AML method to
1051  * support the desired features
1052  */
1053
1054 static int acpi_video_bus_check(struct acpi_video_bus *video)
1055 {
1056         acpi_status status = -ENOENT;
1057         struct device *dev;
1058
1059         if (!video)
1060                 return -EINVAL;
1061
1062         dev = acpi_get_physical_pci_device(video->device->handle);
1063         if (!dev)
1064                 return -ENODEV;
1065         put_device(dev);
1066
1067         /* Since there is no HID, CID and so on for VGA driver, we have
1068          * to check well known required nodes.
1069          */
1070
1071         /* Does this device support video switching? */
1072         if (video->cap._DOS) {
1073                 video->flags.multihead = 1;
1074                 status = 0;
1075         }
1076
1077         /* Does this device support retrieving a video ROM? */
1078         if (video->cap._ROM) {
1079                 video->flags.rom = 1;
1080                 status = 0;
1081         }
1082
1083         /* Does this device support configuring which video device to POST? */
1084         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1085                 video->flags.post = 1;
1086                 status = 0;
1087         }
1088
1089         return status;
1090 }
1091
1092 /* --------------------------------------------------------------------------
1093                               FS Interface (/proc)
1094    -------------------------------------------------------------------------- */
1095
1096 static struct proc_dir_entry *acpi_video_dir;
1097
1098 /* video devices */
1099
1100 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1101 {
1102         struct acpi_video_device *dev = seq->private;
1103
1104
1105         if (!dev)
1106                 goto end;
1107
1108         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1109         seq_printf(seq, "type:         ");
1110         if (dev->flags.crt)
1111                 seq_printf(seq, "CRT\n");
1112         else if (dev->flags.lcd)
1113                 seq_printf(seq, "LCD\n");
1114         else if (dev->flags.tvout)
1115                 seq_printf(seq, "TVOUT\n");
1116         else if (dev->flags.dvi)
1117                 seq_printf(seq, "DVI\n");
1118         else
1119                 seq_printf(seq, "UNKNOWN\n");
1120
1121         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1122
1123       end:
1124         return 0;
1125 }
1126
1127 static int
1128 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1129 {
1130         return single_open(file, acpi_video_device_info_seq_show,
1131                            PDE(inode)->data);
1132 }
1133
1134 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1135 {
1136         int status;
1137         struct acpi_video_device *dev = seq->private;
1138         unsigned long long state;
1139
1140
1141         if (!dev)
1142                 goto end;
1143
1144         status = acpi_video_device_get_state(dev, &state);
1145         seq_printf(seq, "state:     ");
1146         if (ACPI_SUCCESS(status))
1147                 seq_printf(seq, "0x%02llx\n", state);
1148         else
1149                 seq_printf(seq, "<not supported>\n");
1150
1151         status = acpi_video_device_query(dev, &state);
1152         seq_printf(seq, "query:     ");
1153         if (ACPI_SUCCESS(status))
1154                 seq_printf(seq, "0x%02llx\n", state);
1155         else
1156                 seq_printf(seq, "<not supported>\n");
1157
1158       end:
1159         return 0;
1160 }
1161
1162 static int
1163 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1164 {
1165         return single_open(file, acpi_video_device_state_seq_show,
1166                            PDE(inode)->data);
1167 }
1168
1169 static ssize_t
1170 acpi_video_device_write_state(struct file *file,
1171                               const char __user * buffer,
1172                               size_t count, loff_t * data)
1173 {
1174         int status;
1175         struct seq_file *m = file->private_data;
1176         struct acpi_video_device *dev = m->private;
1177         char str[12] = { 0 };
1178         u32 state = 0;
1179
1180
1181         if (!dev || count + 1 > sizeof str)
1182                 return -EINVAL;
1183
1184         if (copy_from_user(str, buffer, count))
1185                 return -EFAULT;
1186
1187         str[count] = 0;
1188         state = simple_strtoul(str, NULL, 0);
1189         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1190
1191         status = acpi_video_device_set_state(dev, state);
1192
1193         if (status)
1194                 return -EFAULT;
1195
1196         return count;
1197 }
1198
1199 static int
1200 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1201 {
1202         struct acpi_video_device *dev = seq->private;
1203         int i;
1204
1205
1206         if (!dev || !dev->brightness) {
1207                 seq_printf(seq, "<not supported>\n");
1208                 return 0;
1209         }
1210
1211         seq_printf(seq, "levels: ");
1212         for (i = 2; i < dev->brightness->count; i++)
1213                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1214         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1215
1216         return 0;
1217 }
1218
1219 static int
1220 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1221 {
1222         return single_open(file, acpi_video_device_brightness_seq_show,
1223                            PDE(inode)->data);
1224 }
1225
1226 static ssize_t
1227 acpi_video_device_write_brightness(struct file *file,
1228                                    const char __user * buffer,
1229                                    size_t count, loff_t * data)
1230 {
1231         struct seq_file *m = file->private_data;
1232         struct acpi_video_device *dev = m->private;
1233         char str[5] = { 0 };
1234         unsigned int level = 0;
1235         int i;
1236
1237
1238         if (!dev || !dev->brightness || count + 1 > sizeof str)
1239                 return -EINVAL;
1240
1241         if (copy_from_user(str, buffer, count))
1242                 return -EFAULT;
1243
1244         str[count] = 0;
1245         level = simple_strtoul(str, NULL, 0);
1246
1247         if (level > 100)
1248                 return -EFAULT;
1249
1250         /* validate through the list of available levels */
1251         for (i = 2; i < dev->brightness->count; i++)
1252                 if (level == dev->brightness->levels[i]) {
1253                         if (!acpi_video_device_lcd_set_level(dev, level))
1254                                 return count;
1255                         break;
1256                 }
1257
1258         return -EINVAL;
1259 }
1260
1261 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1262 {
1263         struct acpi_video_device *dev = seq->private;
1264         int status;
1265         int i;
1266         union acpi_object *edid = NULL;
1267
1268
1269         if (!dev)
1270                 goto out;
1271
1272         status = acpi_video_device_EDID(dev, &edid, 128);
1273         if (ACPI_FAILURE(status)) {
1274                 status = acpi_video_device_EDID(dev, &edid, 256);
1275         }
1276
1277         if (ACPI_FAILURE(status)) {
1278                 goto out;
1279         }
1280
1281         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1282                 for (i = 0; i < edid->buffer.length; i++)
1283                         seq_putc(seq, edid->buffer.pointer[i]);
1284         }
1285
1286       out:
1287         if (!edid)
1288                 seq_printf(seq, "<not supported>\n");
1289         else
1290                 kfree(edid);
1291
1292         return 0;
1293 }
1294
1295 static int
1296 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1297 {
1298         return single_open(file, acpi_video_device_EDID_seq_show,
1299                            PDE(inode)->data);
1300 }
1301
1302 static int acpi_video_device_add_fs(struct acpi_device *device)
1303 {
1304         struct proc_dir_entry *entry, *device_dir;
1305         struct acpi_video_device *vid_dev;
1306
1307         vid_dev = acpi_driver_data(device);
1308         if (!vid_dev)
1309                 return -ENODEV;
1310
1311         device_dir = proc_mkdir(acpi_device_bid(device),
1312                                 vid_dev->video->dir);
1313         if (!device_dir)
1314                 return -ENOMEM;
1315
1316         /* 'info' [R] */
1317         entry = proc_create_data("info", S_IRUGO, device_dir,
1318                         &acpi_video_device_info_fops, acpi_driver_data(device));
1319         if (!entry)
1320                 goto err_remove_dir;
1321
1322         /* 'state' [R/W] */
1323         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1324                                  device_dir,
1325                                  &acpi_video_device_state_fops,
1326                                  acpi_driver_data(device));
1327         if (!entry)
1328                 goto err_remove_info;
1329
1330         /* 'brightness' [R/W] */
1331         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1332                                  device_dir,
1333                                  &acpi_video_device_brightness_fops,
1334                                  acpi_driver_data(device));
1335         if (!entry)
1336                 goto err_remove_state;
1337
1338         /* 'EDID' [R] */
1339         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1340                                  &acpi_video_device_EDID_fops,
1341                                  acpi_driver_data(device));
1342         if (!entry)
1343                 goto err_remove_brightness;
1344
1345         acpi_device_dir(device) = device_dir;
1346
1347         return 0;
1348
1349  err_remove_brightness:
1350         remove_proc_entry("brightness", device_dir);
1351  err_remove_state:
1352         remove_proc_entry("state", device_dir);
1353  err_remove_info:
1354         remove_proc_entry("info", device_dir);
1355  err_remove_dir:
1356         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1357         return -ENOMEM;
1358 }
1359
1360 static int acpi_video_device_remove_fs(struct acpi_device *device)
1361 {
1362         struct acpi_video_device *vid_dev;
1363         struct proc_dir_entry *device_dir;
1364
1365         vid_dev = acpi_driver_data(device);
1366         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1367                 return -ENODEV;
1368
1369         device_dir = acpi_device_dir(device);
1370         if (device_dir) {
1371                 remove_proc_entry("info", device_dir);
1372                 remove_proc_entry("state", device_dir);
1373                 remove_proc_entry("brightness", device_dir);
1374                 remove_proc_entry("EDID", device_dir);
1375                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1376                 acpi_device_dir(device) = NULL;
1377         }
1378
1379         return 0;
1380 }
1381
1382 /* video bus */
1383 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1384 {
1385         struct acpi_video_bus *video = seq->private;
1386
1387
1388         if (!video)
1389                 goto end;
1390
1391         seq_printf(seq, "Switching heads:              %s\n",
1392                    video->flags.multihead ? "yes" : "no");
1393         seq_printf(seq, "Video ROM:                    %s\n",
1394                    video->flags.rom ? "yes" : "no");
1395         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1396                    video->flags.post ? "yes" : "no");
1397
1398       end:
1399         return 0;
1400 }
1401
1402 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1403 {
1404         return single_open(file, acpi_video_bus_info_seq_show,
1405                            PDE(inode)->data);
1406 }
1407
1408 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1409 {
1410         struct acpi_video_bus *video = seq->private;
1411
1412
1413         if (!video)
1414                 goto end;
1415
1416         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1417         seq_printf(seq, "<TODO>\n");
1418
1419       end:
1420         return 0;
1421 }
1422
1423 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1424 {
1425         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1426 }
1427
1428 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1429 {
1430         struct acpi_video_bus *video = seq->private;
1431         unsigned long long options;
1432         int status;
1433
1434
1435         if (!video)
1436                 goto end;
1437
1438         status = acpi_video_bus_POST_options(video, &options);
1439         if (ACPI_SUCCESS(status)) {
1440                 if (!(options & 1)) {
1441                         printk(KERN_WARNING PREFIX
1442                                "The motherboard VGA device is not listed as a possible POST device.\n");
1443                         printk(KERN_WARNING PREFIX
1444                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1445                 }
1446                 printk(KERN_WARNING "%llx\n", options);
1447                 seq_printf(seq, "can POST: <integrated video>");
1448                 if (options & 2)
1449                         seq_printf(seq, " <PCI video>");
1450                 if (options & 4)
1451                         seq_printf(seq, " <AGP video>");
1452                 seq_putc(seq, '\n');
1453         } else
1454                 seq_printf(seq, "<not supported>\n");
1455       end:
1456         return 0;
1457 }
1458
1459 static int
1460 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1461 {
1462         return single_open(file, acpi_video_bus_POST_info_seq_show,
1463                            PDE(inode)->data);
1464 }
1465
1466 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1467 {
1468         struct acpi_video_bus *video = seq->private;
1469         int status;
1470         unsigned long long id;
1471
1472
1473         if (!video)
1474                 goto end;
1475
1476         status = acpi_video_bus_get_POST(video, &id);
1477         if (!ACPI_SUCCESS(status)) {
1478                 seq_printf(seq, "<not supported>\n");
1479                 goto end;
1480         }
1481         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1482
1483       end:
1484         return 0;
1485 }
1486
1487 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1488 {
1489         struct acpi_video_bus *video = seq->private;
1490
1491
1492         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1493
1494         return 0;
1495 }
1496
1497 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1498 {
1499         return single_open(file, acpi_video_bus_POST_seq_show,
1500                            PDE(inode)->data);
1501 }
1502
1503 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1504 {
1505         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1506 }
1507
1508 static ssize_t
1509 acpi_video_bus_write_POST(struct file *file,
1510                           const char __user * buffer,
1511                           size_t count, loff_t * data)
1512 {
1513         int status;
1514         struct seq_file *m = file->private_data;
1515         struct acpi_video_bus *video = m->private;
1516         char str[12] = { 0 };
1517         unsigned long long opt, options;
1518
1519
1520         if (!video || count + 1 > sizeof str)
1521                 return -EINVAL;
1522
1523         status = acpi_video_bus_POST_options(video, &options);
1524         if (!ACPI_SUCCESS(status))
1525                 return -EINVAL;
1526
1527         if (copy_from_user(str, buffer, count))
1528                 return -EFAULT;
1529
1530         str[count] = 0;
1531         opt = strtoul(str, NULL, 0);
1532         if (opt > 3)
1533                 return -EFAULT;
1534
1535         /* just in case an OEM 'forgot' the motherboard... */
1536         options |= 1;
1537
1538         if (options & (1ul << opt)) {
1539                 status = acpi_video_bus_set_POST(video, opt);
1540                 if (!ACPI_SUCCESS(status))
1541                         return -EFAULT;
1542
1543         }
1544
1545         return count;
1546 }
1547
1548 static ssize_t
1549 acpi_video_bus_write_DOS(struct file *file,
1550                          const char __user * buffer,
1551                          size_t count, loff_t * data)
1552 {
1553         int status;
1554         struct seq_file *m = file->private_data;
1555         struct acpi_video_bus *video = m->private;
1556         char str[12] = { 0 };
1557         unsigned long opt;
1558
1559
1560         if (!video || count + 1 > sizeof str)
1561                 return -EINVAL;
1562
1563         if (copy_from_user(str, buffer, count))
1564                 return -EFAULT;
1565
1566         str[count] = 0;
1567         opt = strtoul(str, NULL, 0);
1568         if (opt > 7)
1569                 return -EFAULT;
1570
1571         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1572
1573         if (!ACPI_SUCCESS(status))
1574                 return -EFAULT;
1575
1576         return count;
1577 }
1578
1579 static int acpi_video_bus_add_fs(struct acpi_device *device)
1580 {
1581         struct acpi_video_bus *video = acpi_driver_data(device);
1582         struct proc_dir_entry *device_dir;
1583         struct proc_dir_entry *entry;
1584
1585         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1586         if (!device_dir)
1587                 return -ENOMEM;
1588
1589         /* 'info' [R] */
1590         entry = proc_create_data("info", S_IRUGO, device_dir,
1591                                  &acpi_video_bus_info_fops,
1592                                  acpi_driver_data(device));
1593         if (!entry)
1594                 goto err_remove_dir;
1595
1596         /* 'ROM' [R] */
1597         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1598                                  &acpi_video_bus_ROM_fops,
1599                                  acpi_driver_data(device));
1600         if (!entry)
1601                 goto err_remove_info;
1602
1603         /* 'POST_info' [R] */
1604         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1605                                  &acpi_video_bus_POST_info_fops,
1606                                  acpi_driver_data(device));
1607         if (!entry)
1608                 goto err_remove_rom;
1609
1610         /* 'POST' [R/W] */
1611         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1612                                  device_dir,
1613                                  &acpi_video_bus_POST_fops,
1614                                  acpi_driver_data(device));
1615         if (!entry)
1616                 goto err_remove_post_info;
1617
1618         /* 'DOS' [R/W] */
1619         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1620                                  device_dir,
1621                                  &acpi_video_bus_DOS_fops,
1622                                  acpi_driver_data(device));
1623         if (!entry)
1624                 goto err_remove_post;
1625
1626         video->dir = acpi_device_dir(device) = device_dir;
1627         return 0;
1628
1629  err_remove_post:
1630         remove_proc_entry("POST", device_dir);
1631  err_remove_post_info:
1632         remove_proc_entry("POST_info", device_dir);
1633  err_remove_rom:
1634         remove_proc_entry("ROM", device_dir);
1635  err_remove_info:
1636         remove_proc_entry("info", device_dir);
1637  err_remove_dir:
1638         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1639         return -ENOMEM;
1640 }
1641
1642 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1643 {
1644         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1645
1646         if (device_dir) {
1647                 remove_proc_entry("info", device_dir);
1648                 remove_proc_entry("ROM", device_dir);
1649                 remove_proc_entry("POST_info", device_dir);
1650                 remove_proc_entry("POST", device_dir);
1651                 remove_proc_entry("DOS", device_dir);
1652                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1653                 acpi_device_dir(device) = NULL;
1654         }
1655
1656         return 0;
1657 }
1658
1659 /* --------------------------------------------------------------------------
1660                                  Driver Interface
1661    -------------------------------------------------------------------------- */
1662
1663 /* device interface */
1664 static struct acpi_video_device_attrib*
1665 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1666 {
1667         struct acpi_video_enumerated_device *ids;
1668         int i;
1669
1670         for (i = 0; i < video->attached_count; i++) {
1671                 ids = &video->attached_array[i];
1672                 if ((ids->value.int_val & 0xffff) == device_id)
1673                         return &ids->value.attrib;
1674         }
1675
1676         return NULL;
1677 }
1678
1679 static int
1680 acpi_video_bus_get_one_device(struct acpi_device *device,
1681                               struct acpi_video_bus *video)
1682 {
1683         unsigned long long device_id;
1684         int status;
1685         struct acpi_video_device *data;
1686         struct acpi_video_device_attrib* attribute;
1687
1688         if (!device || !video)
1689                 return -EINVAL;
1690
1691         status =
1692             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1693         if (ACPI_SUCCESS(status)) {
1694
1695                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1696                 if (!data)
1697                         return -ENOMEM;
1698
1699                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1700                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1701                 device->driver_data = data;
1702
1703                 data->device_id = device_id;
1704                 data->video = video;
1705                 data->dev = device;
1706
1707                 attribute = acpi_video_get_device_attr(video, device_id);
1708
1709                 if((attribute != NULL) && attribute->device_id_scheme) {
1710                         switch (attribute->display_type) {
1711                         case ACPI_VIDEO_DISPLAY_CRT:
1712                                 data->flags.crt = 1;
1713                                 break;
1714                         case ACPI_VIDEO_DISPLAY_TV:
1715                                 data->flags.tvout = 1;
1716                                 break;
1717                         case ACPI_VIDEO_DISPLAY_DVI:
1718                                 data->flags.dvi = 1;
1719                                 break;
1720                         case ACPI_VIDEO_DISPLAY_LCD:
1721                                 data->flags.lcd = 1;
1722                                 break;
1723                         default:
1724                                 data->flags.unknown = 1;
1725                                 break;
1726                         }
1727                         if(attribute->bios_can_detect)
1728                                 data->flags.bios = 1;
1729                 } else
1730                         data->flags.unknown = 1;
1731
1732                 acpi_video_device_bind(video, data);
1733                 acpi_video_device_find_cap(data);
1734
1735                 status = acpi_install_notify_handler(device->handle,
1736                                                      ACPI_DEVICE_NOTIFY,
1737                                                      acpi_video_device_notify,
1738                                                      data);
1739                 if (ACPI_FAILURE(status)) {
1740                         printk(KERN_ERR PREFIX
1741                                           "Error installing notify handler\n");
1742                         if(data->brightness)
1743                                 kfree(data->brightness->levels);
1744                         kfree(data->brightness);
1745                         kfree(data);
1746                         return -ENODEV;
1747                 }
1748
1749                 mutex_lock(&video->device_list_lock);
1750                 list_add_tail(&data->entry, &video->video_device_list);
1751                 mutex_unlock(&video->device_list_lock);
1752
1753                 acpi_video_device_add_fs(device);
1754
1755                 return 0;
1756         }
1757
1758         return -ENOENT;
1759 }
1760
1761 /*
1762  *  Arg:
1763  *      video   : video bus device
1764  *
1765  *  Return:
1766  *      none
1767  *
1768  *  Enumerate the video device list of the video bus,
1769  *  bind the ids with the corresponding video devices
1770  *  under the video bus.
1771  */
1772
1773 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1774 {
1775         struct acpi_video_device *dev;
1776
1777         mutex_lock(&video->device_list_lock);
1778
1779         list_for_each_entry(dev, &video->video_device_list, entry)
1780                 acpi_video_device_bind(video, dev);
1781
1782         mutex_unlock(&video->device_list_lock);
1783 }
1784
1785 /*
1786  *  Arg:
1787  *      video   : video bus device
1788  *      device  : video output device under the video
1789  *              bus
1790  *
1791  *  Return:
1792  *      none
1793  *
1794  *  Bind the ids with the corresponding video devices
1795  *  under the video bus.
1796  */
1797
1798 static void
1799 acpi_video_device_bind(struct acpi_video_bus *video,
1800                        struct acpi_video_device *device)
1801 {
1802         struct acpi_video_enumerated_device *ids;
1803         int i;
1804
1805         for (i = 0; i < video->attached_count; i++) {
1806                 ids = &video->attached_array[i];
1807                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1808                         ids->bind_info = device;
1809                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1810                 }
1811         }
1812 }
1813
1814 /*
1815  *  Arg:
1816  *      video   : video bus device
1817  *
1818  *  Return:
1819  *      < 0     : error
1820  *
1821  *  Call _DOD to enumerate all devices attached to display adapter
1822  *
1823  */
1824
1825 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1826 {
1827         int status;
1828         int count;
1829         int i;
1830         struct acpi_video_enumerated_device *active_list;
1831         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1832         union acpi_object *dod = NULL;
1833         union acpi_object *obj;
1834
1835         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1836         if (!ACPI_SUCCESS(status)) {
1837                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1838                 return status;
1839         }
1840
1841         dod = buffer.pointer;
1842         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1843                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1844                 status = -EFAULT;
1845                 goto out;
1846         }
1847
1848         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1849                           dod->package.count));
1850
1851         active_list = kcalloc(1 + dod->package.count,
1852                               sizeof(struct acpi_video_enumerated_device),
1853                               GFP_KERNEL);
1854         if (!active_list) {
1855                 status = -ENOMEM;
1856                 goto out;
1857         }
1858
1859         count = 0;
1860         for (i = 0; i < dod->package.count; i++) {
1861                 obj = &dod->package.elements[i];
1862
1863                 if (obj->type != ACPI_TYPE_INTEGER) {
1864                         printk(KERN_ERR PREFIX
1865                                 "Invalid _DOD data in element %d\n", i);
1866                         continue;
1867                 }
1868
1869                 active_list[count].value.int_val = obj->integer.value;
1870                 active_list[count].bind_info = NULL;
1871                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1872                                   (int)obj->integer.value));
1873                 count++;
1874         }
1875
1876         kfree(video->attached_array);
1877
1878         video->attached_array = active_list;
1879         video->attached_count = count;
1880
1881  out:
1882         kfree(buffer.pointer);
1883         return status;
1884 }
1885
1886 static int
1887 acpi_video_get_next_level(struct acpi_video_device *device,
1888                           u32 level_current, u32 event)
1889 {
1890         int min, max, min_above, max_below, i, l, delta = 255;
1891         max = max_below = 0;
1892         min = min_above = 255;
1893         /* Find closest level to level_current */
1894         for (i = 2; i < device->brightness->count; i++) {
1895                 l = device->brightness->levels[i];
1896                 if (abs(l - level_current) < abs(delta)) {
1897                         delta = l - level_current;
1898                         if (!delta)
1899                                 break;
1900                 }
1901         }
1902         /* Ajust level_current to closest available level */
1903         level_current += delta;
1904         for (i = 2; i < device->brightness->count; i++) {
1905                 l = device->brightness->levels[i];
1906                 if (l < min)
1907                         min = l;
1908                 if (l > max)
1909                         max = l;
1910                 if (l < min_above && l > level_current)
1911                         min_above = l;
1912                 if (l > max_below && l < level_current)
1913                         max_below = l;
1914         }
1915
1916         switch (event) {
1917         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1918                 return (level_current < max) ? min_above : min;
1919         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1920                 return (level_current < max) ? min_above : max;
1921         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1922                 return (level_current > min) ? max_below : min;
1923         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1924         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1925                 return 0;
1926         default:
1927                 return level_current;
1928         }
1929 }
1930
1931 static int
1932 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1933 {
1934         unsigned long long level_current, level_next;
1935         int result = -EINVAL;
1936
1937         if (!device->brightness)
1938                 goto out;
1939
1940         result = acpi_video_device_lcd_get_level_current(device,
1941                                                          &level_current);
1942         if (result)
1943                 goto out;
1944
1945         level_next = acpi_video_get_next_level(device, level_current, event);
1946
1947         result = acpi_video_device_lcd_set_level(device, level_next);
1948
1949 out:
1950         if (result)
1951                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1952
1953         return result;
1954 }
1955
1956 static int
1957 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1958                            struct acpi_device *device)
1959 {
1960         int status = 0;
1961         struct acpi_device *dev;
1962
1963         acpi_video_device_enumerate(video);
1964
1965         list_for_each_entry(dev, &device->children, node) {
1966
1967                 status = acpi_video_bus_get_one_device(dev, video);
1968                 if (ACPI_FAILURE(status)) {
1969                         printk(KERN_WARNING PREFIX
1970                                         "Cant attach device");
1971                         continue;
1972                 }
1973         }
1974         return status;
1975 }
1976
1977 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1978 {
1979         acpi_status status;
1980         struct acpi_video_bus *video;
1981
1982
1983         if (!device || !device->video)
1984                 return -ENOENT;
1985
1986         video = device->video;
1987
1988         acpi_video_device_remove_fs(device->dev);
1989
1990         status = acpi_remove_notify_handler(device->dev->handle,
1991                                             ACPI_DEVICE_NOTIFY,
1992                                             acpi_video_device_notify);
1993         backlight_device_unregister(device->backlight);
1994         if (device->cdev) {
1995                 sysfs_remove_link(&device->dev->dev.kobj,
1996                                   "thermal_cooling");
1997                 sysfs_remove_link(&device->cdev->device.kobj,
1998                                   "device");
1999                 thermal_cooling_device_unregister(device->cdev);
2000                 device->cdev = NULL;
2001         }
2002         video_output_unregister(device->output_dev);
2003
2004         return 0;
2005 }
2006
2007 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2008 {
2009         int status;
2010         struct acpi_video_device *dev, *next;
2011
2012         mutex_lock(&video->device_list_lock);
2013
2014         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2015
2016                 status = acpi_video_bus_put_one_device(dev);
2017                 if (ACPI_FAILURE(status))
2018                         printk(KERN_WARNING PREFIX
2019                                "hhuuhhuu bug in acpi video driver.\n");
2020
2021                 if (dev->brightness) {
2022                         kfree(dev->brightness->levels);
2023                         kfree(dev->brightness);
2024                 }
2025                 list_del(&dev->entry);
2026                 kfree(dev);
2027         }
2028
2029         mutex_unlock(&video->device_list_lock);
2030
2031         return 0;
2032 }
2033
2034 /* acpi_video interface */
2035
2036 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2037 {
2038         return acpi_video_bus_DOS(video, 0, 0);
2039 }
2040
2041 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2042 {
2043         return acpi_video_bus_DOS(video, 0, 1);
2044 }
2045
2046 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2047 {
2048         struct acpi_video_bus *video = acpi_driver_data(device);
2049         struct input_dev *input;
2050         int keycode;
2051
2052         if (!video)
2053                 return;
2054
2055         input = video->input;
2056
2057         switch (event) {
2058         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2059                                          * most likely via hotkey. */
2060                 acpi_bus_generate_proc_event(device, event, 0);
2061                 keycode = KEY_SWITCHVIDEOMODE;
2062                 break;
2063
2064         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2065                                          * connector. */
2066                 acpi_video_device_enumerate(video);
2067                 acpi_video_device_rebind(video);
2068                 acpi_bus_generate_proc_event(device, event, 0);
2069                 keycode = KEY_SWITCHVIDEOMODE;
2070                 break;
2071
2072         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2073                 acpi_bus_generate_proc_event(device, event, 0);
2074                 keycode = KEY_SWITCHVIDEOMODE;
2075                 break;
2076         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2077                 acpi_bus_generate_proc_event(device, event, 0);
2078                 keycode = KEY_VIDEO_NEXT;
2079                 break;
2080         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2081                 acpi_bus_generate_proc_event(device, event, 0);
2082                 keycode = KEY_VIDEO_PREV;
2083                 break;
2084
2085         default:
2086                 keycode = KEY_UNKNOWN;
2087                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2088                                   "Unsupported event [0x%x]\n", event));
2089                 break;
2090         }
2091
2092         acpi_notifier_call_chain(device, event, 0);
2093         input_report_key(input, keycode, 1);
2094         input_sync(input);
2095         input_report_key(input, keycode, 0);
2096         input_sync(input);
2097
2098         return;
2099 }
2100
2101 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2102 {
2103         struct acpi_video_device *video_device = data;
2104         struct acpi_device *device = NULL;
2105         struct acpi_video_bus *bus;
2106         struct input_dev *input;
2107         int keycode;
2108
2109         if (!video_device)
2110                 return;
2111
2112         device = video_device->dev;
2113         bus = video_device->video;
2114         input = bus->input;
2115
2116         switch (event) {
2117         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2118                 if (brightness_switch_enabled)
2119                         acpi_video_switch_brightness(video_device, event);
2120                 acpi_bus_generate_proc_event(device, event, 0);
2121                 keycode = KEY_BRIGHTNESS_CYCLE;
2122                 break;
2123         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2124                 if (brightness_switch_enabled)
2125                         acpi_video_switch_brightness(video_device, event);
2126                 acpi_bus_generate_proc_event(device, event, 0);
2127                 keycode = KEY_BRIGHTNESSUP;
2128                 break;
2129         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2130                 if (brightness_switch_enabled)
2131                         acpi_video_switch_brightness(video_device, event);
2132                 acpi_bus_generate_proc_event(device, event, 0);
2133                 keycode = KEY_BRIGHTNESSDOWN;
2134                 break;
2135         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2136                 if (brightness_switch_enabled)
2137                         acpi_video_switch_brightness(video_device, event);
2138                 acpi_bus_generate_proc_event(device, event, 0);
2139                 keycode = KEY_BRIGHTNESS_ZERO;
2140                 break;
2141         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2142                 if (brightness_switch_enabled)
2143                         acpi_video_switch_brightness(video_device, event);
2144                 acpi_bus_generate_proc_event(device, event, 0);
2145                 keycode = KEY_DISPLAY_OFF;
2146                 break;
2147         default:
2148                 keycode = KEY_UNKNOWN;
2149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2150                                   "Unsupported event [0x%x]\n", event));
2151                 break;
2152         }
2153
2154         acpi_notifier_call_chain(device, event, 0);
2155         input_report_key(input, keycode, 1);
2156         input_sync(input);
2157         input_report_key(input, keycode, 0);
2158         input_sync(input);
2159
2160         return;
2161 }
2162
2163 static int instance;
2164 static int acpi_video_resume(struct acpi_device *device)
2165 {
2166         struct acpi_video_bus *video;
2167         struct acpi_video_device *video_device;
2168         int i;
2169
2170         if (!device || !acpi_driver_data(device))
2171                 return -EINVAL;
2172
2173         video = acpi_driver_data(device);
2174
2175         for (i = 0; i < video->attached_count; i++) {
2176                 video_device = video->attached_array[i].bind_info;
2177                 if (video_device && video_device->backlight)
2178                         acpi_video_set_brightness(video_device->backlight);
2179         }
2180         return AE_OK;
2181 }
2182
2183 static int acpi_video_bus_add(struct acpi_device *device)
2184 {
2185         struct acpi_video_bus *video;
2186         struct input_dev *input;
2187         int error;
2188
2189         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2190         if (!video)
2191                 return -ENOMEM;
2192
2193         /* a hack to fix the duplicate name "VID" problem on T61 */
2194         if (!strcmp(device->pnp.bus_id, "VID")) {
2195                 if (instance)
2196                         device->pnp.bus_id[3] = '0' + instance;
2197                 instance ++;
2198         }
2199         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2200         if (!strcmp(device->pnp.bus_id, "VGA")) {
2201                 if (instance)
2202                         device->pnp.bus_id[3] = '0' + instance;
2203                 instance++;
2204         }
2205
2206         video->device = device;
2207         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2208         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2209         device->driver_data = video;
2210
2211         acpi_video_bus_find_cap(video);
2212         error = acpi_video_bus_check(video);
2213         if (error)
2214                 goto err_free_video;
2215
2216         error = acpi_video_bus_add_fs(device);
2217         if (error)
2218                 goto err_free_video;
2219
2220         mutex_init(&video->device_list_lock);
2221         INIT_LIST_HEAD(&video->video_device_list);
2222
2223         acpi_video_bus_get_devices(video, device);
2224         acpi_video_bus_start_devices(video);
2225
2226         video->input = input = input_allocate_device();
2227         if (!input) {
2228                 error = -ENOMEM;
2229                 goto err_stop_video;
2230         }
2231
2232         snprintf(video->phys, sizeof(video->phys),
2233                 "%s/video/input0", acpi_device_hid(video->device));
2234
2235         input->name = acpi_device_name(video->device);
2236         input->phys = video->phys;
2237         input->id.bustype = BUS_HOST;
2238         input->id.product = 0x06;
2239         input->dev.parent = &device->dev;
2240         input->evbit[0] = BIT(EV_KEY);
2241         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2242         set_bit(KEY_VIDEO_NEXT, input->keybit);
2243         set_bit(KEY_VIDEO_PREV, input->keybit);
2244         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2245         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2246         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2247         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2248         set_bit(KEY_DISPLAY_OFF, input->keybit);
2249         set_bit(KEY_UNKNOWN, input->keybit);
2250
2251         error = input_register_device(input);
2252         if (error)
2253                 goto err_free_input_dev;
2254
2255         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2256                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2257                video->flags.multihead ? "yes" : "no",
2258                video->flags.rom ? "yes" : "no",
2259                video->flags.post ? "yes" : "no");
2260
2261         return 0;
2262
2263  err_free_input_dev:
2264         input_free_device(input);
2265  err_stop_video:
2266         acpi_video_bus_stop_devices(video);
2267         acpi_video_bus_put_devices(video);
2268         kfree(video->attached_array);
2269         acpi_video_bus_remove_fs(device);
2270  err_free_video:
2271         kfree(video);
2272         device->driver_data = NULL;
2273
2274         return error;
2275 }
2276
2277 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2278 {
2279         struct acpi_video_bus *video = NULL;
2280
2281
2282         if (!device || !acpi_driver_data(device))
2283                 return -EINVAL;
2284
2285         video = acpi_driver_data(device);
2286
2287         acpi_video_bus_stop_devices(video);
2288         acpi_video_bus_put_devices(video);
2289         acpi_video_bus_remove_fs(device);
2290
2291         input_unregister_device(video->input);
2292         kfree(video->attached_array);
2293         kfree(video);
2294
2295         return 0;
2296 }
2297
2298 static int __init intel_opregion_present(void)
2299 {
2300 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2301         struct pci_dev *dev = NULL;
2302         u32 address;
2303
2304         for_each_pci_dev(dev) {
2305                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2306                         continue;
2307                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2308                         continue;
2309                 pci_read_config_dword(dev, 0xfc, &address);
2310                 if (!address)
2311                         continue;
2312                 return 1;
2313         }
2314 #endif
2315         return 0;
2316 }
2317
2318 int acpi_video_register(void)
2319 {
2320         int result = 0;
2321
2322         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2323         if (!acpi_video_dir)
2324                 return -ENODEV;
2325
2326         result = acpi_bus_register_driver(&acpi_video_bus);
2327         if (result < 0) {
2328                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2329                 return -ENODEV;
2330         }
2331
2332         return 0;
2333 }
2334 EXPORT_SYMBOL(acpi_video_register);
2335
2336 /*
2337  * This is kind of nasty. Hardware using Intel chipsets may require
2338  * the video opregion code to be run first in order to initialise
2339  * state before any ACPI video calls are made. To handle this we defer
2340  * registration of the video class until the opregion code has run.
2341  */
2342
2343 static int __init acpi_video_init(void)
2344 {
2345         dmi_check_system(video_dmi_table);
2346
2347         if (intel_opregion_present())
2348                 return 0;
2349
2350         return acpi_video_register();
2351 }
2352
2353 void acpi_video_exit(void)
2354 {
2355
2356         acpi_bus_unregister_driver(&acpi_video_bus);
2357
2358         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2359
2360         return;
2361 }
2362 EXPORT_SYMBOL(acpi_video_exit);
2363
2364 module_init(acpi_video_init);
2365 module_exit(acpi_video_exit);