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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 static int
 542 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 543                                         unsigned long long *level)
 544 {
 545         acpi_status status = AE_OK;
 546
 547         if (device->cap._BQC || device->cap._BCQ) {
 548                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 549
 550                 status = acpi_evaluate_integer(device->dev->handle, buf,
 551                                                 NULL, level);
 552                 if (ACPI_SUCCESS(status)) {
 553                         if (device->brightness->flags._BQC_use_index) {
 554                                 if (device->brightness->flags._BCL_reversed)
 555                                         *level = device->brightness->count
 556                                                                  - 3 - (*level);
 557                                 *level = device->brightness->levels[*level + 2];
 558
 559                         }
 560                         device->brightness->curr = *level;
 561                         return 0;
 562                 } else {
 563                         /* Fixme:
 564                          * should we return an error or ignore this failure?
 565                          * dev->brightness->curr is a cached value which stores
 566                          * the correct current backlight level in most cases.
 567                          * ACPI video backlight still works w/ buggy _BQC.
 568                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 569                          */
 570                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 571                         device->cap._BQC = device->cap._BCQ = 0;
 572                 }
 573         }
 574
 575         *level = device->brightness->curr;
 576         return 0;
 577 }
 578
 579 static int
 580 acpi_video_device_EDID(struct acpi_video_device *device,
 581                        union acpi_object **edid, ssize_t length)
 582 {
 583         int status;
 584         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 585         union acpi_object *obj;
 586         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 587         struct acpi_object_list args = { 1, &arg0 };
 588
 589
 590         *edid = NULL;
 591
 592         if (!device)
 593                 return -ENODEV;
 594         if (length == 128)
 595                 arg0.integer.value = 1;
 596         else if (length == 256)
 597                 arg0.integer.value = 2;
 598         else
 599                 return -EINVAL;
 600
 601         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 602         if (ACPI_FAILURE(status))
 603                 return -ENODEV;
 604
 605         obj = buffer.pointer;
 606
 607         if (obj && obj->type == ACPI_TYPE_BUFFER)
 608                 *edid = obj;
 609         else {
 610                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 611                 status = -EFAULT;
 612                 kfree(obj);
 613         }
 614
 615         return status;
 616 }
 617
 618 /* bus */
 619
 620 static int
 621 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 622 {
 623         int status;
 624         unsigned long long tmp;
 625         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 626         struct acpi_object_list args = { 1, &arg0 };
 627
 628
 629         arg0.integer.value = option;
 630
 631         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 632         if (ACPI_SUCCESS(status))
 633                 status = tmp ? (-EINVAL) : (AE_OK);
 634
 635         return status;
 636 }
 637
 638 static int
 639 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 640 {
 641         int status;
 642
 643         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 644
 645         return status;
 646 }
 647
 648 static int
 649 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 650                             unsigned long long *options)
 651 {
 652         int status;
 653
 654         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 655         *options &= 3;
 656
 657         return status;
 658 }
 659
 660 /*
 661  *  Arg:
 662  *      video           : video bus device pointer
 663  *      bios_flag       :
 664  *              0.      The system BIOS should NOT automatically switch(toggle)
 665  *                      the active display output.
 666  *              1.      The system BIOS should automatically switch (toggle) the
 667  *                      active display output. No switch event.
 668  *              2.      The _DGS value should be locked.
 669  *              3.      The system BIOS should not automatically switch (toggle) the
 670  *                      active display output, but instead generate the display switch
 671  *                      event notify code.
 672  *      lcd_flag        :
 673  *              0.      The system BIOS should automatically control the brightness level
 674  *                      of the LCD when the power changes from AC to DC
 675  *              1.      The system BIOS should NOT automatically control the brightness
 676  *                      level of the LCD when the power changes from AC to DC.
 677  * Return Value:
 678  *              -1      wrong arg.
 679  */
 680
 681 static int
 682 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 683 {
 684         acpi_integer status = 0;
 685         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 686         struct acpi_object_list args = { 1, &arg0 };
 687
 688
 689         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 690                 status = -1;
 691                 goto Failed;
 692         }
 693         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 694         video->dos_setting = arg0.integer.value;
 695         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 696
 697       Failed:
 698         return status;
 699 }
 700
 701 /*
 702  * Simple comparison function used to sort backlight levels.
 703  */
 704
 705 static int
 706 acpi_video_cmp_level(const void *a, const void *b)
 707 {
 708         return *(int *)a - *(int *)b;
 709 }
 710
 711 /*
 712  *  Arg:
 713  *      device  : video output device (LCD, CRT, ..)
 714  *
 715  *  Return Value:
 716  *      Maximum brightness level
 717  *
 718  *  Allocate and initialize device->brightness.
 719  */
 720
 721 static int
 722 acpi_video_init_brightness(struct acpi_video_device *device)
 723 {
 724         union acpi_object *obj = NULL;
 725         int i, max_level = 0, count = 0, level_ac_battery = 0;
 726         unsigned long long level, level_old;
 727         union acpi_object *o;
 728         struct acpi_video_device_brightness *br = NULL;
 729         int result = -EINVAL;
 730
 731         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 732                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 733                                                 "LCD brightness level\n"));
 734                 goto out;
 735         }
 736
 737         if (obj->package.count < 2)
 738                 goto out;
 739
 740         br = kzalloc(sizeof(*br), GFP_KERNEL);
 741         if (!br) {
 742                 printk(KERN_ERR "can't allocate memory\n");
 743                 result = -ENOMEM;
 744                 goto out;
 745         }
 746
 747         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 748                                 GFP_KERNEL);
 749         if (!br->levels) {
 750                 result = -ENOMEM;
 751                 goto out_free;
 752         }
 753
 754         for (i = 0; i < obj->package.count; i++) {
 755                 o = (union acpi_object *)&obj->package.elements[i];
 756                 if (o->type != ACPI_TYPE_INTEGER) {
 757                         printk(KERN_ERR PREFIX "Invalid data\n");
 758                         continue;
 759                 }
 760                 br->levels[count] = (u32) o->integer.value;
 761
 762                 if (br->levels[count] > max_level)
 763                         max_level = br->levels[count];
 764                 count++;
 765         }
 766
 767         /*
 768          * some buggy BIOS don't export the levels
 769          * when machine is on AC/Battery in _BCL package.
 770          * In this case, the first two elements in _BCL packages
 771          * are also supported brightness levels that OS should take care of.
 772          */
 773         for (i = 2; i < count; i++)
 774                 if (br->levels[i] == br->levels[0] ||
 775                     br->levels[i] == br->levels[1])
 776                         level_ac_battery++;
 777
 778         if (level_ac_battery < 2) {
 779                 level_ac_battery = 2 - level_ac_battery;
 780                 br->flags._BCL_no_ac_battery_levels = 1;
 781                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 782                         br->levels[i] = br->levels[i - level_ac_battery];
 783                 count += level_ac_battery;
 784         } else if (level_ac_battery > 2)
 785                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 786
 787         /* Check if the _BCL package is in a reversed order */
 788         if (max_level == br->levels[2]) {
 789                 br->flags._BCL_reversed = 1;
 790                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 791                         acpi_video_cmp_level, NULL);
 792         } else if (max_level != br->levels[count - 1])
 793                 ACPI_ERROR((AE_INFO,
 794                             "Found unordered _BCL package\n"));
 795
 796         br->count = count;
 797         device->brightness = br;
 798
 799         /* Check the input/output of _BQC/_BCL/_BCM */
 800         if ((max_level < 100) && (max_level <= (count - 2)))
 801                 br->flags._BCL_use_index = 1;
 802
 803         /*
 804          * _BCM is always consistent with _BCL,
 805          * at least for all the laptops we have ever seen.
 806          */
 807         br->flags._BCM_use_index = br->flags._BCL_use_index;
 808
 809         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 810         br->curr = max_level;
 811         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 812         if (result)
 813                 goto out_free_levels;
 814
 815         result = acpi_video_device_lcd_set_level(device, br->curr);
 816         if (result)
 817                 goto out_free_levels;
 818
 819         result = acpi_video_device_lcd_get_level_current(device, &level);
 820         if (result)
 821                 goto out_free_levels;
 822
 823         if ((level != level_old) && !br->flags._BCM_use_index) {
 824                 /* Note:
 825                  * This piece of code does not work correctly if the current
 826                  * brightness levels is 0.
 827                  * But I guess boxes that boot with such a dark screen are rare
 828                  * and no more code is needed to cover this specifial case.
 829                  */
 830
 831                 if (level_ac_battery != 2) {
 832                         /*
 833                          * For now, we don't support the _BCL like this:
 834                          * 16, 15, 0, 1, 2, 3, ..., 14, 15, 16
 835                          * because we may mess up the index returned by _BQC.
 836                          * Plus: we have not got a box like this.
 837                          */
 838                         ACPI_ERROR((AE_INFO, "_BCL not supported\n"));
 839                 }
 840                 br->flags._BQC_use_index = 1;
 841         }
 842
 843         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 844                           "found %d brightness levels\n", count - 2));
 845         kfree(obj);
 846         return result;
 847
 848 out_free_levels:
 849         kfree(br->levels);
 850 out_free:
 851         kfree(br);
 852 out:
 853         device->brightness = NULL;
 854         kfree(obj);
 855         return result;
 856 }
 857
 858 /*
 859  *  Arg:
 860  *      device  : video output device (LCD, CRT, ..)
 861  *
 862  *  Return Value:
 863  *      None
 864  *
 865  *  Find out all required AML methods defined under the output
 866  *  device.
 867  */
 868
 869 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 870 {
 871         acpi_handle h_dummy1;
 872
 873
 874         memset(&device->cap, 0, sizeof(device->cap));
 875
 876         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 877                 device->cap._ADR = 1;
 878         }
 879         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 880                 device->cap._BCL = 1;
 881         }
 882         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 883                 device->cap._BCM = 1;
 884         }
 885         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 886                 device->cap._BQC = 1;
 887         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 888                                 &h_dummy1))) {
 889                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 890                 device->cap._BCQ = 1;
 891         }
 892
 893         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 894                 device->cap._DDC = 1;
 895         }
 896         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 897                 device->cap._DCS = 1;
 898         }
 899         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 900                 device->cap._DGS = 1;
 901         }
 902         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 903                 device->cap._DSS = 1;
 904         }
 905
 906         if (acpi_video_backlight_support()) {
 907                 int result;
 908                 static int count = 0;
 909                 char *name;
 910
 911                 result = acpi_video_init_brightness(device);
 912                 if (result)
 913                         return;
 914                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 915                 if (!name)
 916                         return;
 917
 918                 sprintf(name, "acpi_video%d", count++);
 919                 device->backlight = backlight_device_register(name,
 920                         NULL, device, &acpi_backlight_ops);
 921                 device->backlight->props.max_brightness = device->brightness->count-3;
 922                 kfree(name);
 923
 924                 device->cdev = thermal_cooling_device_register("LCD",
 925                                         device->dev, &video_cooling_ops);
 926                 if (IS_ERR(device->cdev))
 927                         return;
 928
 929                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 930                          device->cdev->id);
 931                 result = sysfs_create_link(&device->dev->dev.kobj,
 932                                 &device->cdev->device.kobj,
 933                                 "thermal_cooling");
 934                 if (result)
 935                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 936                 result = sysfs_create_link(&device->cdev->device.kobj,
 937                                 &device->dev->dev.kobj, "device");
 938                 if (result)
 939                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 940
 941         }
 942
 943         if (acpi_video_display_switch_support()) {
 944
 945                 if (device->cap._DCS && device->cap._DSS) {
 946                         static int count;
 947                         char *name;
 948                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 949                         if (!name)
 950                                 return;
 951                         sprintf(name, "acpi_video%d", count++);
 952                         device->output_dev = video_output_register(name,
 953                                         NULL, device, &acpi_output_properties);
 954                         kfree(name);
 955                 }
 956         }
 957 }
 958
 959 /*
 960  *  Arg:
 961  *      device  : video output device (VGA)
 962  *
 963  *  Return Value:
 964  *      None
 965  *
 966  *  Find out all required AML methods defined under the video bus device.
 967  */
 968
 969 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 970 {
 971         acpi_handle h_dummy1;
 972
 973         memset(&video->cap, 0, sizeof(video->cap));
 974         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 975                 video->cap._DOS = 1;
 976         }
 977         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 978                 video->cap._DOD = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 981                 video->cap._ROM = 1;
 982         }
 983         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 984                 video->cap._GPD = 1;
 985         }
 986         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 987                 video->cap._SPD = 1;
 988         }
 989         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 990                 video->cap._VPO = 1;
 991         }
 992 }
 993
 994 /*
 995  * Check whether the video bus device has required AML method to
 996  * support the desired features
 997  */
 998
 999 static int acpi_video_bus_check(struct acpi_video_bus *video)
1000 {
1001         acpi_status status = -ENOENT;
1002         struct device *dev;
1003
1004         if (!video)
1005                 return -EINVAL;
1006
1007         dev = acpi_get_physical_pci_device(video->device->handle);
1008         if (!dev)
1009                 return -ENODEV;
1010         put_device(dev);
1011
1012         /* Since there is no HID, CID and so on for VGA driver, we have
1013          * to check well known required nodes.
1014          */
1015
1016         /* Does this device support video switching? */
1017         if (video->cap._DOS) {
1018                 video->flags.multihead = 1;
1019                 status = 0;
1020         }
1021
1022         /* Does this device support retrieving a video ROM? */
1023         if (video->cap._ROM) {
1024                 video->flags.rom = 1;
1025                 status = 0;
1026         }
1027
1028         /* Does this device support configuring which video device to POST? */
1029         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1030                 video->flags.post = 1;
1031                 status = 0;
1032         }
1033
1034         return status;
1035 }
1036
1037 /* --------------------------------------------------------------------------
1038                               FS Interface (/proc)
1039    -------------------------------------------------------------------------- */
1040
1041 static struct proc_dir_entry *acpi_video_dir;
1042
1043 /* video devices */
1044
1045 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1046 {
1047         struct acpi_video_device *dev = seq->private;
1048
1049
1050         if (!dev)
1051                 goto end;
1052
1053         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1054         seq_printf(seq, "type:         ");
1055         if (dev->flags.crt)
1056                 seq_printf(seq, "CRT\n");
1057         else if (dev->flags.lcd)
1058                 seq_printf(seq, "LCD\n");
1059         else if (dev->flags.tvout)
1060                 seq_printf(seq, "TVOUT\n");
1061         else if (dev->flags.dvi)
1062                 seq_printf(seq, "DVI\n");
1063         else
1064                 seq_printf(seq, "UNKNOWN\n");
1065
1066         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1067
1068       end:
1069         return 0;
1070 }
1071
1072 static int
1073 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1074 {
1075         return single_open(file, acpi_video_device_info_seq_show,
1076                            PDE(inode)->data);
1077 }
1078
1079 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1080 {
1081         int status;
1082         struct acpi_video_device *dev = seq->private;
1083         unsigned long long state;
1084
1085
1086         if (!dev)
1087                 goto end;
1088
1089         status = acpi_video_device_get_state(dev, &state);
1090         seq_printf(seq, "state:     ");
1091         if (ACPI_SUCCESS(status))
1092                 seq_printf(seq, "0x%02llx\n", state);
1093         else
1094                 seq_printf(seq, "<not supported>\n");
1095
1096         status = acpi_video_device_query(dev, &state);
1097         seq_printf(seq, "query:     ");
1098         if (ACPI_SUCCESS(status))
1099                 seq_printf(seq, "0x%02llx\n", state);
1100         else
1101                 seq_printf(seq, "<not supported>\n");
1102
1103       end:
1104         return 0;
1105 }
1106
1107 static int
1108 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1109 {
1110         return single_open(file, acpi_video_device_state_seq_show,
1111                            PDE(inode)->data);
1112 }
1113
1114 static ssize_t
1115 acpi_video_device_write_state(struct file *file,
1116                               const char __user * buffer,
1117                               size_t count, loff_t * data)
1118 {
1119         int status;
1120         struct seq_file *m = file->private_data;
1121         struct acpi_video_device *dev = m->private;
1122         char str[12] = { 0 };
1123         u32 state = 0;
1124
1125
1126         if (!dev || count + 1 > sizeof str)
1127                 return -EINVAL;
1128
1129         if (copy_from_user(str, buffer, count))
1130                 return -EFAULT;
1131
1132         str[count] = 0;
1133         state = simple_strtoul(str, NULL, 0);
1134         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1135
1136         status = acpi_video_device_set_state(dev, state);
1137
1138         if (status)
1139                 return -EFAULT;
1140
1141         return count;
1142 }
1143
1144 static int
1145 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1146 {
1147         struct acpi_video_device *dev = seq->private;
1148         int i;
1149
1150
1151         if (!dev || !dev->brightness) {
1152                 seq_printf(seq, "<not supported>\n");
1153                 return 0;
1154         }
1155
1156         seq_printf(seq, "levels: ");
1157         for (i = 2; i < dev->brightness->count; i++)
1158                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1159         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1160
1161         return 0;
1162 }
1163
1164 static int
1165 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1166 {
1167         return single_open(file, acpi_video_device_brightness_seq_show,
1168                            PDE(inode)->data);
1169 }
1170
1171 static ssize_t
1172 acpi_video_device_write_brightness(struct file *file,
1173                                    const char __user * buffer,
1174                                    size_t count, loff_t * data)
1175 {
1176         struct seq_file *m = file->private_data;
1177         struct acpi_video_device *dev = m->private;
1178         char str[5] = { 0 };
1179         unsigned int level = 0;
1180         int i;
1181
1182
1183         if (!dev || !dev->brightness || count + 1 > sizeof str)
1184                 return -EINVAL;
1185
1186         if (copy_from_user(str, buffer, count))
1187                 return -EFAULT;
1188
1189         str[count] = 0;
1190         level = simple_strtoul(str, NULL, 0);
1191
1192         if (level > 100)
1193                 return -EFAULT;
1194
1195         /* validate through the list of available levels */
1196         for (i = 2; i < dev->brightness->count; i++)
1197                 if (level == dev->brightness->levels[i]) {
1198                         if (!acpi_video_device_lcd_set_level(dev, level))
1199                                 return count;
1200                         break;
1201                 }
1202
1203         return -EINVAL;
1204 }
1205
1206 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1207 {
1208         struct acpi_video_device *dev = seq->private;
1209         int status;
1210         int i;
1211         union acpi_object *edid = NULL;
1212
1213
1214         if (!dev)
1215                 goto out;
1216
1217         status = acpi_video_device_EDID(dev, &edid, 128);
1218         if (ACPI_FAILURE(status)) {
1219                 status = acpi_video_device_EDID(dev, &edid, 256);
1220         }
1221
1222         if (ACPI_FAILURE(status)) {
1223                 goto out;
1224         }
1225
1226         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1227                 for (i = 0; i < edid->buffer.length; i++)
1228                         seq_putc(seq, edid->buffer.pointer[i]);
1229         }
1230
1231       out:
1232         if (!edid)
1233                 seq_printf(seq, "<not supported>\n");
1234         else
1235                 kfree(edid);
1236
1237         return 0;
1238 }
1239
1240 static int
1241 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1242 {
1243         return single_open(file, acpi_video_device_EDID_seq_show,
1244                            PDE(inode)->data);
1245 }
1246
1247 static int acpi_video_device_add_fs(struct acpi_device *device)
1248 {
1249         struct proc_dir_entry *entry, *device_dir;
1250         struct acpi_video_device *vid_dev;
1251
1252         vid_dev = acpi_driver_data(device);
1253         if (!vid_dev)
1254                 return -ENODEV;
1255
1256         device_dir = proc_mkdir(acpi_device_bid(device),
1257                                 vid_dev->video->dir);
1258         if (!device_dir)
1259                 return -ENOMEM;
1260
1261         /* 'info' [R] */
1262         entry = proc_create_data("info", S_IRUGO, device_dir,
1263                         &acpi_video_device_info_fops, acpi_driver_data(device));
1264         if (!entry)
1265                 goto err_remove_dir;
1266
1267         /* 'state' [R/W] */
1268         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1269                                  device_dir,
1270                                  &acpi_video_device_state_fops,
1271                                  acpi_driver_data(device));
1272         if (!entry)
1273                 goto err_remove_info;
1274
1275         /* 'brightness' [R/W] */
1276         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1277                                  device_dir,
1278                                  &acpi_video_device_brightness_fops,
1279                                  acpi_driver_data(device));
1280         if (!entry)
1281                 goto err_remove_state;
1282
1283         /* 'EDID' [R] */
1284         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1285                                  &acpi_video_device_EDID_fops,
1286                                  acpi_driver_data(device));
1287         if (!entry)
1288                 goto err_remove_brightness;
1289
1290         acpi_device_dir(device) = device_dir;
1291
1292         return 0;
1293
1294  err_remove_brightness:
1295         remove_proc_entry("brightness", device_dir);
1296  err_remove_state:
1297         remove_proc_entry("state", device_dir);
1298  err_remove_info:
1299         remove_proc_entry("info", device_dir);
1300  err_remove_dir:
1301         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1302         return -ENOMEM;
1303 }
1304
1305 static int acpi_video_device_remove_fs(struct acpi_device *device)
1306 {
1307         struct acpi_video_device *vid_dev;
1308         struct proc_dir_entry *device_dir;
1309
1310         vid_dev = acpi_driver_data(device);
1311         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1312                 return -ENODEV;
1313
1314         device_dir = acpi_device_dir(device);
1315         if (device_dir) {
1316                 remove_proc_entry("info", device_dir);
1317                 remove_proc_entry("state", device_dir);
1318                 remove_proc_entry("brightness", device_dir);
1319                 remove_proc_entry("EDID", device_dir);
1320                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1321                 acpi_device_dir(device) = NULL;
1322         }
1323
1324         return 0;
1325 }
1326
1327 /* video bus */
1328 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1329 {
1330         struct acpi_video_bus *video = seq->private;
1331
1332
1333         if (!video)
1334                 goto end;
1335
1336         seq_printf(seq, "Switching heads:              %s\n",
1337                    video->flags.multihead ? "yes" : "no");
1338         seq_printf(seq, "Video ROM:                    %s\n",
1339                    video->flags.rom ? "yes" : "no");
1340         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1341                    video->flags.post ? "yes" : "no");
1342
1343       end:
1344         return 0;
1345 }
1346
1347 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1348 {
1349         return single_open(file, acpi_video_bus_info_seq_show,
1350                            PDE(inode)->data);
1351 }
1352
1353 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1354 {
1355         struct acpi_video_bus *video = seq->private;
1356
1357
1358         if (!video)
1359                 goto end;
1360
1361         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1362         seq_printf(seq, "<TODO>\n");
1363
1364       end:
1365         return 0;
1366 }
1367
1368 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1369 {
1370         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1371 }
1372
1373 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1374 {
1375         struct acpi_video_bus *video = seq->private;
1376         unsigned long long options;
1377         int status;
1378
1379
1380         if (!video)
1381                 goto end;
1382
1383         status = acpi_video_bus_POST_options(video, &options);
1384         if (ACPI_SUCCESS(status)) {
1385                 if (!(options & 1)) {
1386                         printk(KERN_WARNING PREFIX
1387                                "The motherboard VGA device is not listed as a possible POST device.\n");
1388                         printk(KERN_WARNING PREFIX
1389                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1390                 }
1391                 printk(KERN_WARNING "%llx\n", options);
1392                 seq_printf(seq, "can POST: <integrated video>");
1393                 if (options & 2)
1394                         seq_printf(seq, " <PCI video>");
1395                 if (options & 4)
1396                         seq_printf(seq, " <AGP video>");
1397                 seq_putc(seq, '\n');
1398         } else
1399                 seq_printf(seq, "<not supported>\n");
1400       end:
1401         return 0;
1402 }
1403
1404 static int
1405 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1406 {
1407         return single_open(file, acpi_video_bus_POST_info_seq_show,
1408                            PDE(inode)->data);
1409 }
1410
1411 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1412 {
1413         struct acpi_video_bus *video = seq->private;
1414         int status;
1415         unsigned long long id;
1416
1417
1418         if (!video)
1419                 goto end;
1420
1421         status = acpi_video_bus_get_POST(video, &id);
1422         if (!ACPI_SUCCESS(status)) {
1423                 seq_printf(seq, "<not supported>\n");
1424                 goto end;
1425         }
1426         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1427
1428       end:
1429         return 0;
1430 }
1431
1432 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1433 {
1434         struct acpi_video_bus *video = seq->private;
1435
1436
1437         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1438
1439         return 0;
1440 }
1441
1442 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1443 {
1444         return single_open(file, acpi_video_bus_POST_seq_show,
1445                            PDE(inode)->data);
1446 }
1447
1448 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1449 {
1450         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1451 }
1452
1453 static ssize_t
1454 acpi_video_bus_write_POST(struct file *file,
1455                           const char __user * buffer,
1456                           size_t count, loff_t * data)
1457 {
1458         int status;
1459         struct seq_file *m = file->private_data;
1460         struct acpi_video_bus *video = m->private;
1461         char str[12] = { 0 };
1462         unsigned long long opt, options;
1463
1464
1465         if (!video || count + 1 > sizeof str)
1466                 return -EINVAL;
1467
1468         status = acpi_video_bus_POST_options(video, &options);
1469         if (!ACPI_SUCCESS(status))
1470                 return -EINVAL;
1471
1472         if (copy_from_user(str, buffer, count))
1473                 return -EFAULT;
1474
1475         str[count] = 0;
1476         opt = strtoul(str, NULL, 0);
1477         if (opt > 3)
1478                 return -EFAULT;
1479
1480         /* just in case an OEM 'forgot' the motherboard... */
1481         options |= 1;
1482
1483         if (options & (1ul << opt)) {
1484                 status = acpi_video_bus_set_POST(video, opt);
1485                 if (!ACPI_SUCCESS(status))
1486                         return -EFAULT;
1487
1488         }
1489
1490         return count;
1491 }
1492
1493 static ssize_t
1494 acpi_video_bus_write_DOS(struct file *file,
1495                          const char __user * buffer,
1496                          size_t count, loff_t * data)
1497 {
1498         int status;
1499         struct seq_file *m = file->private_data;
1500         struct acpi_video_bus *video = m->private;
1501         char str[12] = { 0 };
1502         unsigned long opt;
1503
1504
1505         if (!video || count + 1 > sizeof str)
1506                 return -EINVAL;
1507
1508         if (copy_from_user(str, buffer, count))
1509                 return -EFAULT;
1510
1511         str[count] = 0;
1512         opt = strtoul(str, NULL, 0);
1513         if (opt > 7)
1514                 return -EFAULT;
1515
1516         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1517
1518         if (!ACPI_SUCCESS(status))
1519                 return -EFAULT;
1520
1521         return count;
1522 }
1523
1524 static int acpi_video_bus_add_fs(struct acpi_device *device)
1525 {
1526         struct acpi_video_bus *video = acpi_driver_data(device);
1527         struct proc_dir_entry *device_dir;
1528         struct proc_dir_entry *entry;
1529
1530         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1531         if (!device_dir)
1532                 return -ENOMEM;
1533
1534         /* 'info' [R] */
1535         entry = proc_create_data("info", S_IRUGO, device_dir,
1536                                  &acpi_video_bus_info_fops,
1537                                  acpi_driver_data(device));
1538         if (!entry)
1539                 goto err_remove_dir;
1540
1541         /* 'ROM' [R] */
1542         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1543                                  &acpi_video_bus_ROM_fops,
1544                                  acpi_driver_data(device));
1545         if (!entry)
1546                 goto err_remove_info;
1547
1548         /* 'POST_info' [R] */
1549         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1550                                  &acpi_video_bus_POST_info_fops,
1551                                  acpi_driver_data(device));
1552         if (!entry)
1553                 goto err_remove_rom;
1554
1555         /* 'POST' [R/W] */
1556         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1557                                  device_dir,
1558                                  &acpi_video_bus_POST_fops,
1559                                  acpi_driver_data(device));
1560         if (!entry)
1561                 goto err_remove_post_info;
1562
1563         /* 'DOS' [R/W] */
1564         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1565                                  device_dir,
1566                                  &acpi_video_bus_DOS_fops,
1567                                  acpi_driver_data(device));
1568         if (!entry)
1569                 goto err_remove_post;
1570
1571         video->dir = acpi_device_dir(device) = device_dir;
1572         return 0;
1573
1574  err_remove_post:
1575         remove_proc_entry("POST", device_dir);
1576  err_remove_post_info:
1577         remove_proc_entry("POST_info", device_dir);
1578  err_remove_rom:
1579         remove_proc_entry("ROM", device_dir);
1580  err_remove_info:
1581         remove_proc_entry("info", device_dir);
1582  err_remove_dir:
1583         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1584         return -ENOMEM;
1585 }
1586
1587 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1588 {
1589         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1590
1591         if (device_dir) {
1592                 remove_proc_entry("info", device_dir);
1593                 remove_proc_entry("ROM", device_dir);
1594                 remove_proc_entry("POST_info", device_dir);
1595                 remove_proc_entry("POST", device_dir);
1596                 remove_proc_entry("DOS", device_dir);
1597                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1598                 acpi_device_dir(device) = NULL;
1599         }
1600
1601         return 0;
1602 }
1603
1604 /* --------------------------------------------------------------------------
1605                                  Driver Interface
1606    -------------------------------------------------------------------------- */
1607
1608 /* device interface */
1609 static struct acpi_video_device_attrib*
1610 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1611 {
1612         struct acpi_video_enumerated_device *ids;
1613         int i;
1614
1615         for (i = 0; i < video->attached_count; i++) {
1616                 ids = &video->attached_array[i];
1617                 if ((ids->value.int_val & 0xffff) == device_id)
1618                         return &ids->value.attrib;
1619         }
1620
1621         return NULL;
1622 }
1623
1624 static int
1625 acpi_video_bus_get_one_device(struct acpi_device *device,
1626                               struct acpi_video_bus *video)
1627 {
1628         unsigned long long device_id;
1629         int status;
1630         struct acpi_video_device *data;
1631         struct acpi_video_device_attrib* attribute;
1632
1633         if (!device || !video)
1634                 return -EINVAL;
1635
1636         status =
1637             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1638         if (ACPI_SUCCESS(status)) {
1639
1640                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1641                 if (!data)
1642                         return -ENOMEM;
1643
1644                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1645                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1646                 device->driver_data = data;
1647
1648                 data->device_id = device_id;
1649                 data->video = video;
1650                 data->dev = device;
1651
1652                 attribute = acpi_video_get_device_attr(video, device_id);
1653
1654                 if((attribute != NULL) && attribute->device_id_scheme) {
1655                         switch (attribute->display_type) {
1656                         case ACPI_VIDEO_DISPLAY_CRT:
1657                                 data->flags.crt = 1;
1658                                 break;
1659                         case ACPI_VIDEO_DISPLAY_TV:
1660                                 data->flags.tvout = 1;
1661                                 break;
1662                         case ACPI_VIDEO_DISPLAY_DVI:
1663                                 data->flags.dvi = 1;
1664                                 break;
1665                         case ACPI_VIDEO_DISPLAY_LCD:
1666                                 data->flags.lcd = 1;
1667                                 break;
1668                         default:
1669                                 data->flags.unknown = 1;
1670                                 break;
1671                         }
1672                         if(attribute->bios_can_detect)
1673                                 data->flags.bios = 1;
1674                 } else
1675                         data->flags.unknown = 1;
1676
1677                 acpi_video_device_bind(video, data);
1678                 acpi_video_device_find_cap(data);
1679
1680                 status = acpi_install_notify_handler(device->handle,
1681                                                      ACPI_DEVICE_NOTIFY,
1682                                                      acpi_video_device_notify,
1683                                                      data);
1684                 if (ACPI_FAILURE(status)) {
1685                         printk(KERN_ERR PREFIX
1686                                           "Error installing notify handler\n");
1687                         if(data->brightness)
1688                                 kfree(data->brightness->levels);
1689                         kfree(data->brightness);
1690                         kfree(data);
1691                         return -ENODEV;
1692                 }
1693
1694                 mutex_lock(&video->device_list_lock);
1695                 list_add_tail(&data->entry, &video->video_device_list);
1696                 mutex_unlock(&video->device_list_lock);
1697
1698                 acpi_video_device_add_fs(device);
1699
1700                 return 0;
1701         }
1702
1703         return -ENOENT;
1704 }
1705
1706 /*
1707  *  Arg:
1708  *      video   : video bus device
1709  *
1710  *  Return:
1711  *      none
1712  *
1713  *  Enumerate the video device list of the video bus,
1714  *  bind the ids with the corresponding video devices
1715  *  under the video bus.
1716  */
1717
1718 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1719 {
1720         struct acpi_video_device *dev;
1721
1722         mutex_lock(&video->device_list_lock);
1723
1724         list_for_each_entry(dev, &video->video_device_list, entry)
1725                 acpi_video_device_bind(video, dev);
1726
1727         mutex_unlock(&video->device_list_lock);
1728 }
1729
1730 /*
1731  *  Arg:
1732  *      video   : video bus device
1733  *      device  : video output device under the video
1734  *              bus
1735  *
1736  *  Return:
1737  *      none
1738  *
1739  *  Bind the ids with the corresponding video devices
1740  *  under the video bus.
1741  */
1742
1743 static void
1744 acpi_video_device_bind(struct acpi_video_bus *video,
1745                        struct acpi_video_device *device)
1746 {
1747         struct acpi_video_enumerated_device *ids;
1748         int i;
1749
1750         for (i = 0; i < video->attached_count; i++) {
1751                 ids = &video->attached_array[i];
1752                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1753                         ids->bind_info = device;
1754                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1755                 }
1756         }
1757 }
1758
1759 /*
1760  *  Arg:
1761  *      video   : video bus device
1762  *
1763  *  Return:
1764  *      < 0     : error
1765  *
1766  *  Call _DOD to enumerate all devices attached to display adapter
1767  *
1768  */
1769
1770 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1771 {
1772         int status;
1773         int count;
1774         int i;
1775         struct acpi_video_enumerated_device *active_list;
1776         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1777         union acpi_object *dod = NULL;
1778         union acpi_object *obj;
1779
1780         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1781         if (!ACPI_SUCCESS(status)) {
1782                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1783                 return status;
1784         }
1785
1786         dod = buffer.pointer;
1787         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1788                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1789                 status = -EFAULT;
1790                 goto out;
1791         }
1792
1793         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1794                           dod->package.count));
1795
1796         active_list = kcalloc(1 + dod->package.count,
1797                               sizeof(struct acpi_video_enumerated_device),
1798                               GFP_KERNEL);
1799         if (!active_list) {
1800                 status = -ENOMEM;
1801                 goto out;
1802         }
1803
1804         count = 0;
1805         for (i = 0; i < dod->package.count; i++) {
1806                 obj = &dod->package.elements[i];
1807
1808                 if (obj->type != ACPI_TYPE_INTEGER) {
1809                         printk(KERN_ERR PREFIX
1810                                 "Invalid _DOD data in element %d\n", i);
1811                         continue;
1812                 }
1813
1814                 active_list[count].value.int_val = obj->integer.value;
1815                 active_list[count].bind_info = NULL;
1816                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1817                                   (int)obj->integer.value));
1818                 count++;
1819         }
1820
1821         kfree(video->attached_array);
1822
1823         video->attached_array = active_list;
1824         video->attached_count = count;
1825
1826  out:
1827         kfree(buffer.pointer);
1828         return status;
1829 }
1830
1831 static int
1832 acpi_video_get_next_level(struct acpi_video_device *device,
1833                           u32 level_current, u32 event)
1834 {
1835         int min, max, min_above, max_below, i, l, delta = 255;
1836         max = max_below = 0;
1837         min = min_above = 255;
1838         /* Find closest level to level_current */
1839         for (i = 2; i < device->brightness->count; i++) {
1840                 l = device->brightness->levels[i];
1841                 if (abs(l - level_current) < abs(delta)) {
1842                         delta = l - level_current;
1843                         if (!delta)
1844                                 break;
1845                 }
1846         }
1847         /* Ajust level_current to closest available level */
1848         level_current += delta;
1849         for (i = 2; i < device->brightness->count; i++) {
1850                 l = device->brightness->levels[i];
1851                 if (l < min)
1852                         min = l;
1853                 if (l > max)
1854                         max = l;
1855                 if (l < min_above && l > level_current)
1856                         min_above = l;
1857                 if (l > max_below && l < level_current)
1858                         max_below = l;
1859         }
1860
1861         switch (event) {
1862         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1863                 return (level_current < max) ? min_above : min;
1864         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1865                 return (level_current < max) ? min_above : max;
1866         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1867                 return (level_current > min) ? max_below : min;
1868         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1869         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1870                 return 0;
1871         default:
1872                 return level_current;
1873         }
1874 }
1875
1876 static int
1877 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1878 {
1879         unsigned long long level_current, level_next;
1880         int result = -EINVAL;
1881
1882         if (!device->brightness)
1883                 goto out;
1884
1885         result = acpi_video_device_lcd_get_level_current(device,
1886                                                          &level_current);
1887         if (result)
1888                 goto out;
1889
1890         level_next = acpi_video_get_next_level(device, level_current, event);
1891
1892         result = acpi_video_device_lcd_set_level(device, level_next);
1893
1894 out:
1895         if (result)
1896                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1897
1898         return result;
1899 }
1900
1901 static int
1902 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1903                            struct acpi_device *device)
1904 {
1905         int status = 0;
1906         struct acpi_device *dev;
1907
1908         acpi_video_device_enumerate(video);
1909
1910         list_for_each_entry(dev, &device->children, node) {
1911
1912                 status = acpi_video_bus_get_one_device(dev, video);
1913                 if (ACPI_FAILURE(status)) {
1914                         printk(KERN_WARNING PREFIX
1915                                         "Cant attach device");
1916                         continue;
1917                 }
1918         }
1919         return status;
1920 }
1921
1922 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1923 {
1924         acpi_status status;
1925         struct acpi_video_bus *video;
1926
1927
1928         if (!device || !device->video)
1929                 return -ENOENT;
1930
1931         video = device->video;
1932
1933         acpi_video_device_remove_fs(device->dev);
1934
1935         status = acpi_remove_notify_handler(device->dev->handle,
1936                                             ACPI_DEVICE_NOTIFY,
1937                                             acpi_video_device_notify);
1938         backlight_device_unregister(device->backlight);
1939         if (device->cdev) {
1940                 sysfs_remove_link(&device->dev->dev.kobj,
1941                                   "thermal_cooling");
1942                 sysfs_remove_link(&device->cdev->device.kobj,
1943                                   "device");
1944                 thermal_cooling_device_unregister(device->cdev);
1945                 device->cdev = NULL;
1946         }
1947         video_output_unregister(device->output_dev);
1948
1949         return 0;
1950 }
1951
1952 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1953 {
1954         int status;
1955         struct acpi_video_device *dev, *next;
1956
1957         mutex_lock(&video->device_list_lock);
1958
1959         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1960
1961                 status = acpi_video_bus_put_one_device(dev);
1962                 if (ACPI_FAILURE(status))
1963                         printk(KERN_WARNING PREFIX
1964                                "hhuuhhuu bug in acpi video driver.\n");
1965
1966                 if (dev->brightness) {
1967                         kfree(dev->brightness->levels);
1968                         kfree(dev->brightness);
1969                 }
1970                 list_del(&dev->entry);
1971                 kfree(dev);
1972         }
1973
1974         mutex_unlock(&video->device_list_lock);
1975
1976         return 0;
1977 }
1978
1979 /* acpi_video interface */
1980
1981 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1982 {
1983         return acpi_video_bus_DOS(video, 0, 0);
1984 }
1985
1986 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1987 {
1988         return acpi_video_bus_DOS(video, 0, 1);
1989 }
1990
1991 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1992 {
1993         struct acpi_video_bus *video = acpi_driver_data(device);
1994         struct input_dev *input;
1995         int keycode;
1996
1997         if (!video)
1998                 return;
1999
2000         input = video->input;
2001
2002         switch (event) {
2003         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2004                                          * most likely via hotkey. */
2005                 acpi_bus_generate_proc_event(device, event, 0);
2006                 keycode = KEY_SWITCHVIDEOMODE;
2007                 break;
2008
2009         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2010                                          * connector. */
2011                 acpi_video_device_enumerate(video);
2012                 acpi_video_device_rebind(video);
2013                 acpi_bus_generate_proc_event(device, event, 0);
2014                 keycode = KEY_SWITCHVIDEOMODE;
2015                 break;
2016
2017         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2018                 acpi_bus_generate_proc_event(device, event, 0);
2019                 keycode = KEY_SWITCHVIDEOMODE;
2020                 break;
2021         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2022                 acpi_bus_generate_proc_event(device, event, 0);
2023                 keycode = KEY_VIDEO_NEXT;
2024                 break;
2025         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2026                 acpi_bus_generate_proc_event(device, event, 0);
2027                 keycode = KEY_VIDEO_PREV;
2028                 break;
2029
2030         default:
2031                 keycode = KEY_UNKNOWN;
2032                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2033                                   "Unsupported event [0x%x]\n", event));
2034                 break;
2035         }
2036
2037         acpi_notifier_call_chain(device, event, 0);
2038         input_report_key(input, keycode, 1);
2039         input_sync(input);
2040         input_report_key(input, keycode, 0);
2041         input_sync(input);
2042
2043         return;
2044 }
2045
2046 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2047 {
2048         struct acpi_video_device *video_device = data;
2049         struct acpi_device *device = NULL;
2050         struct acpi_video_bus *bus;
2051         struct input_dev *input;
2052         int keycode;
2053
2054         if (!video_device)
2055                 return;
2056
2057         device = video_device->dev;
2058         bus = video_device->video;
2059         input = bus->input;
2060
2061         switch (event) {
2062         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2063                 if (brightness_switch_enabled)
2064                         acpi_video_switch_brightness(video_device, event);
2065                 acpi_bus_generate_proc_event(device, event, 0);
2066                 keycode = KEY_BRIGHTNESS_CYCLE;
2067                 break;
2068         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2069                 if (brightness_switch_enabled)
2070                         acpi_video_switch_brightness(video_device, event);
2071                 acpi_bus_generate_proc_event(device, event, 0);
2072                 keycode = KEY_BRIGHTNESSUP;
2073                 break;
2074         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2075                 if (brightness_switch_enabled)
2076                         acpi_video_switch_brightness(video_device, event);
2077                 acpi_bus_generate_proc_event(device, event, 0);
2078                 keycode = KEY_BRIGHTNESSDOWN;
2079                 break;
2080         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2081                 if (brightness_switch_enabled)
2082                         acpi_video_switch_brightness(video_device, event);
2083                 acpi_bus_generate_proc_event(device, event, 0);
2084                 keycode = KEY_BRIGHTNESS_ZERO;
2085                 break;
2086         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2087                 if (brightness_switch_enabled)
2088                         acpi_video_switch_brightness(video_device, event);
2089                 acpi_bus_generate_proc_event(device, event, 0);
2090                 keycode = KEY_DISPLAY_OFF;
2091                 break;
2092         default:
2093                 keycode = KEY_UNKNOWN;
2094                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2095                                   "Unsupported event [0x%x]\n", event));
2096                 break;
2097         }
2098
2099         acpi_notifier_call_chain(device, event, 0);
2100         input_report_key(input, keycode, 1);
2101         input_sync(input);
2102         input_report_key(input, keycode, 0);
2103         input_sync(input);
2104
2105         return;
2106 }
2107
2108 static int instance;
2109 static int acpi_video_resume(struct acpi_device *device)
2110 {
2111         struct acpi_video_bus *video;
2112         struct acpi_video_device *video_device;
2113         int i;
2114
2115         if (!device || !acpi_driver_data(device))
2116                 return -EINVAL;
2117
2118         video = acpi_driver_data(device);
2119
2120         for (i = 0; i < video->attached_count; i++) {
2121                 video_device = video->attached_array[i].bind_info;
2122                 if (video_device && video_device->backlight)
2123                         acpi_video_set_brightness(video_device->backlight);
2124         }
2125         return AE_OK;
2126 }
2127
2128 static int acpi_video_bus_add(struct acpi_device *device)
2129 {
2130         struct acpi_video_bus *video;
2131         struct input_dev *input;
2132         int error;
2133
2134         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2135         if (!video)
2136                 return -ENOMEM;
2137
2138         /* a hack to fix the duplicate name "VID" problem on T61 */
2139         if (!strcmp(device->pnp.bus_id, "VID")) {
2140                 if (instance)
2141                         device->pnp.bus_id[3] = '0' + instance;
2142                 instance ++;
2143         }
2144         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2145         if (!strcmp(device->pnp.bus_id, "VGA")) {
2146                 if (instance)
2147                         device->pnp.bus_id[3] = '0' + instance;
2148                 instance++;
2149         }
2150
2151         video->device = device;
2152         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2153         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2154         device->driver_data = video;
2155
2156         acpi_video_bus_find_cap(video);
2157         error = acpi_video_bus_check(video);
2158         if (error)
2159                 goto err_free_video;
2160
2161         error = acpi_video_bus_add_fs(device);
2162         if (error)
2163                 goto err_free_video;
2164
2165         mutex_init(&video->device_list_lock);
2166         INIT_LIST_HEAD(&video->video_device_list);
2167
2168         acpi_video_bus_get_devices(video, device);
2169         acpi_video_bus_start_devices(video);
2170
2171         video->input = input = input_allocate_device();
2172         if (!input) {
2173                 error = -ENOMEM;
2174                 goto err_stop_video;
2175         }
2176
2177         snprintf(video->phys, sizeof(video->phys),
2178                 "%s/video/input0", acpi_device_hid(video->device));
2179
2180         input->name = acpi_device_name(video->device);
2181         input->phys = video->phys;
2182         input->id.bustype = BUS_HOST;
2183         input->id.product = 0x06;
2184         input->dev.parent = &device->dev;
2185         input->evbit[0] = BIT(EV_KEY);
2186         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2187         set_bit(KEY_VIDEO_NEXT, input->keybit);
2188         set_bit(KEY_VIDEO_PREV, input->keybit);
2189         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2190         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2191         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2192         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2193         set_bit(KEY_DISPLAY_OFF, input->keybit);
2194         set_bit(KEY_UNKNOWN, input->keybit);
2195
2196         error = input_register_device(input);
2197         if (error)
2198                 goto err_free_input_dev;
2199
2200         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2201                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2202                video->flags.multihead ? "yes" : "no",
2203                video->flags.rom ? "yes" : "no",
2204                video->flags.post ? "yes" : "no");
2205
2206         return 0;
2207
2208  err_free_input_dev:
2209         input_free_device(input);
2210  err_stop_video:
2211         acpi_video_bus_stop_devices(video);
2212         acpi_video_bus_put_devices(video);
2213         kfree(video->attached_array);
2214         acpi_video_bus_remove_fs(device);
2215  err_free_video:
2216         kfree(video);
2217         device->driver_data = NULL;
2218
2219         return error;
2220 }
2221
2222 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2223 {
2224         struct acpi_video_bus *video = NULL;
2225
2226
2227         if (!device || !acpi_driver_data(device))
2228                 return -EINVAL;
2229
2230         video = acpi_driver_data(device);
2231
2232         acpi_video_bus_stop_devices(video);
2233         acpi_video_bus_put_devices(video);
2234         acpi_video_bus_remove_fs(device);
2235
2236         input_unregister_device(video->input);
2237         kfree(video->attached_array);
2238         kfree(video);
2239
2240         return 0;
2241 }
2242
2243 static int __init intel_opregion_present(void)
2244 {
2245 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2246         struct pci_dev *dev = NULL;
2247         u32 address;
2248
2249         for_each_pci_dev(dev) {
2250                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2251                         continue;
2252                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2253                         continue;
2254                 pci_read_config_dword(dev, 0xfc, &address);
2255                 if (!address)
2256                         continue;
2257                 return 1;
2258         }
2259 #endif
2260         return 0;
2261 }
2262
2263 int acpi_video_register(void)
2264 {
2265         int result = 0;
2266
2267         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2268         if (!acpi_video_dir)
2269                 return -ENODEV;
2270
2271         result = acpi_bus_register_driver(&acpi_video_bus);
2272         if (result < 0) {
2273                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2274                 return -ENODEV;
2275         }
2276
2277         return 0;
2278 }
2279 EXPORT_SYMBOL(acpi_video_register);
2280
2281 /*
2282  * This is kind of nasty. Hardware using Intel chipsets may require
2283  * the video opregion code to be run first in order to initialise
2284  * state before any ACPI video calls are made. To handle this we defer
2285  * registration of the video class until the opregion code has run.
2286  */
2287
2288 static int __init acpi_video_init(void)
2289 {
2290         if (intel_opregion_present())
2291                 return 0;
2292
2293         return acpi_video_register();
2294 }
2295
2296 static void __exit acpi_video_exit(void)
2297 {
2298
2299         acpi_bus_unregister_driver(&acpi_video_bus);
2300
2301         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2302
2303         return;
2304 }
2305
2306 module_init(acpi_video_init);
2307 module_exit(acpi_video_exit);