drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/list.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33
  34 #include <asm/uaccess.h>
  35
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38
  39 #define ACPI_VIDEO_COMPONENT            0x08000000
  40 #define ACPI_VIDEO_CLASS                "video"
  41 #define ACPI_VIDEO_DRIVER_NAME          "ACPI Video Driver"
  42 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  43 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  44 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  45 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  46 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  47 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  48 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  49
  50 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x82
  51 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x83
  52 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x84
  53 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x85
  54 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x86
  55
  56 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  57 #define ACPI_VIDEO_HEAD_END             (~0u)
  58
  59 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  60 ACPI_MODULE_NAME("acpi_video")
  61
  62     MODULE_AUTHOR("Bruno Ducrot");
  63 MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
  64 MODULE_LICENSE("GPL");
  65
  66 static int acpi_video_bus_add(struct acpi_device *device);
  67 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  68
  69 static struct acpi_driver acpi_video_bus = {
  70         .name = ACPI_VIDEO_DRIVER_NAME,
  71         .class = ACPI_VIDEO_CLASS,
  72         .ids = ACPI_VIDEO_HID,
  73         .ops = {
  74                 .add = acpi_video_bus_add,
  75                 .remove = acpi_video_bus_remove,
  76                 },
  77 };
  78
  79 struct acpi_video_bus_flags {
  80         u8 multihead:1;         /* can switch video heads */
  81         u8 rom:1;               /* can retrieve a video rom */
  82         u8 post:1;              /* can configure the head to */
  83         u8 reserved:5;
  84 };
  85
  86 struct acpi_video_bus_cap {
  87         u8 _DOS:1;              /*Enable/Disable output switching */
  88         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
  89         u8 _ROM:1;              /*Get ROM Data */
  90         u8 _GPD:1;              /*Get POST Device */
  91         u8 _SPD:1;              /*Set POST Device */
  92         u8 _VPO:1;              /*Video POST Options */
  93         u8 reserved:2;
  94 };
  95
  96 struct acpi_video_device_attrib {
  97         u32 display_index:4;    /* A zero-based instance of the Display */
  98         u32 display_port_attachment:4;  /*This field differenates displays type */
  99         u32 display_type:4;     /*Describe the specific type in use */
 100         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
 101         u32 bios_can_detect:1;  /*BIOS can detect the device */
 102         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 103                                    the VGA device. */
 104         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 105         u32 reserved:10;        /*Must be 0 */
 106         u32 device_id_scheme:1; /*Device ID Scheme */
 107 };
 108
 109 struct acpi_video_enumerated_device {
 110         union {
 111                 u32 int_val;
 112                 struct acpi_video_device_attrib attrib;
 113         } value;
 114         struct acpi_video_device *bind_info;
 115 };
 116
 117 struct acpi_video_bus {
 118         struct acpi_device *device;
 119         u8 dos_setting;
 120         struct acpi_video_enumerated_device *attached_array;
 121         u8 attached_count;
 122         struct acpi_video_bus_cap cap;
 123         struct acpi_video_bus_flags flags;
 124         struct semaphore sem;
 125         struct list_head video_device_list;
 126         struct proc_dir_entry *dir;
 127 };
 128
 129 struct acpi_video_device_flags {
 130         u8 crt:1;
 131         u8 lcd:1;
 132         u8 tvout:1;
 133         u8 bios:1;
 134         u8 unknown:1;
 135         u8 reserved:3;
 136 };
 137
 138 struct acpi_video_device_cap {
 139         u8 _ADR:1;              /*Return the unique ID */
 140         u8 _BCL:1;              /*Query list of brightness control levels supported */
 141         u8 _BCM:1;              /*Set the brightness level */
 142         u8 _DDC:1;              /*Return the EDID for this device */
 143         u8 _DCS:1;              /*Return status of output device */
 144         u8 _DGS:1;              /*Query graphics state */
 145         u8 _DSS:1;              /*Device state set */
 146         u8 _reserved:1;
 147 };
 148
 149 struct acpi_video_device_brightness {
 150         int curr;
 151         int count;
 152         int *levels;
 153 };
 154
 155 struct acpi_video_device {
 156         unsigned long device_id;
 157         struct acpi_video_device_flags flags;
 158         struct acpi_video_device_cap cap;
 159         struct list_head entry;
 160         struct acpi_video_bus *video;
 161         struct acpi_device *dev;
 162         struct acpi_video_device_brightness *brightness;
 163 };
 164
 165 /* bus */
 166 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 167 static struct file_operations acpi_video_bus_info_fops = {
 168         .open = acpi_video_bus_info_open_fs,
 169         .read = seq_read,
 170         .llseek = seq_lseek,
 171         .release = single_release,
 172 };
 173
 174 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 175 static struct file_operations acpi_video_bus_ROM_fops = {
 176         .open = acpi_video_bus_ROM_open_fs,
 177         .read = seq_read,
 178         .llseek = seq_lseek,
 179         .release = single_release,
 180 };
 181
 182 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 183                                             struct file *file);
 184 static struct file_operations acpi_video_bus_POST_info_fops = {
 185         .open = acpi_video_bus_POST_info_open_fs,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 192 static struct file_operations acpi_video_bus_POST_fops = {
 193         .open = acpi_video_bus_POST_open_fs,
 194         .read = seq_read,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 200 static struct file_operations acpi_video_bus_DOS_fops = {
 201         .open = acpi_video_bus_DOS_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 /* device */
 208 static int acpi_video_device_info_open_fs(struct inode *inode,
 209                                           struct file *file);
 210 static struct file_operations acpi_video_device_info_fops = {
 211         .open = acpi_video_device_info_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 static int acpi_video_device_state_open_fs(struct inode *inode,
 218                                            struct file *file);
 219 static struct file_operations acpi_video_device_state_fops = {
 220         .open = acpi_video_device_state_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 227                                                 struct file *file);
 228 static struct file_operations acpi_video_device_brightness_fops = {
 229         .open = acpi_video_device_brightness_open_fs,
 230         .read = seq_read,
 231         .llseek = seq_lseek,
 232         .release = single_release,
 233 };
 234
 235 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 236                                           struct file *file);
 237 static struct file_operations acpi_video_device_EDID_fops = {
 238         .open = acpi_video_device_EDID_open_fs,
 239         .read = seq_read,
 240         .llseek = seq_lseek,
 241         .release = single_release,
 242 };
 243
 244 static char device_decode[][30] = {
 245         "motherboard VGA device",
 246         "PCI VGA device",
 247         "AGP VGA device",
 248         "UNKNOWN",
 249 };
 250
 251 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 252 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 253 static void acpi_video_device_bind(struct acpi_video_bus *video,
 254                                    struct acpi_video_device *device);
 255 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 256 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 257 static int acpi_video_get_next_level(struct acpi_video_device *device,
 258                                      u32 level_current, u32 event);
 259 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 260                                          int event);
 261
 262 /* --------------------------------------------------------------------------
 263                                Video Management
 264    -------------------------------------------------------------------------- */
 265
 266 /* device */
 267
 268 static int
 269 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 270 {
 271         int status;
 272
 273         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 274
 275         return status;
 276 }
 277
 278 static int
 279 acpi_video_device_get_state(struct acpi_video_device *device,
 280                             unsigned long *state)
 281 {
 282         int status;
 283
 284         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 285
 286         return status;
 287 }
 288
 289 static int
 290 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 291 {
 292         int status;
 293         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 294         struct acpi_object_list args = { 1, &arg0 };
 295         unsigned long ret;
 296
 297
 298         arg0.integer.value = state;
 299         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 300
 301         return status;
 302 }
 303
 304 static int
 305 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 306                                    union acpi_object **levels)
 307 {
 308         int status;
 309         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 310         union acpi_object *obj;
 311
 312
 313         *levels = NULL;
 314
 315         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 316         if (!ACPI_SUCCESS(status))
 317                 return status;
 318         obj = (union acpi_object *)buffer.pointer;
 319         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 320                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 321                 status = -EFAULT;
 322                 goto err;
 323         }
 324
 325         *levels = obj;
 326
 327         return 0;
 328
 329       err:
 330         kfree(buffer.pointer);
 331
 332         return status;
 333 }
 334
 335 static int
 336 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 337 {
 338         int status;
 339         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 340         struct acpi_object_list args = { 1, &arg0 };
 341
 342
 343         arg0.integer.value = level;
 344         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 345
 346         printk(KERN_DEBUG "set_level status: %x\n", status);
 347         return status;
 348 }
 349
 350 static int
 351 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 352                                         unsigned long *level)
 353 {
 354         int status;
 355
 356         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
 357
 358         return status;
 359 }
 360
 361 static int
 362 acpi_video_device_EDID(struct acpi_video_device *device,
 363                        union acpi_object **edid, ssize_t length)
 364 {
 365         int status;
 366         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 367         union acpi_object *obj;
 368         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 369         struct acpi_object_list args = { 1, &arg0 };
 370
 371
 372         *edid = NULL;
 373
 374         if (!device)
 375                 return -ENODEV;
 376         if (length == 128)
 377                 arg0.integer.value = 1;
 378         else if (length == 256)
 379                 arg0.integer.value = 2;
 380         else
 381                 return -EINVAL;
 382
 383         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 384         if (ACPI_FAILURE(status))
 385                 return -ENODEV;
 386
 387         obj = (union acpi_object *)buffer.pointer;
 388
 389         if (obj && obj->type == ACPI_TYPE_BUFFER)
 390                 *edid = obj;
 391         else {
 392                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 393                 status = -EFAULT;
 394                 kfree(obj);
 395         }
 396
 397         return status;
 398 }
 399
 400 /* bus */
 401
 402 static int
 403 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 404 {
 405         int status;
 406         unsigned long tmp;
 407         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 408         struct acpi_object_list args = { 1, &arg0 };
 409
 410
 411         arg0.integer.value = option;
 412
 413         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 414         if (ACPI_SUCCESS(status))
 415                 status = tmp ? (-EINVAL) : (AE_OK);
 416
 417         return status;
 418 }
 419
 420 static int
 421 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 422 {
 423         int status;
 424
 425         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 426
 427         return status;
 428 }
 429
 430 static int
 431 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 432                             unsigned long *options)
 433 {
 434         int status;
 435
 436         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 437         *options &= 3;
 438
 439         return status;
 440 }
 441
 442 /*
 443  *  Arg:
 444  *      video           : video bus device pointer
 445  *      bios_flag       :
 446  *              0.      The system BIOS should NOT automatically switch(toggle)
 447  *                      the active display output.
 448  *              1.      The system BIOS should automatically switch (toggle) the
 449  *                      active display output. No swich event.
 450  *              2.      The _DGS value should be locked.
 451  *              3.      The system BIOS should not automatically switch (toggle) the
 452  *                      active display output, but instead generate the display switch
 453  *                      event notify code.
 454  *      lcd_flag        :
 455  *              0.      The system BIOS should automatically control the brightness level
 456  *                      of the LCD, when the power changes from AC to DC
 457  *              1.      The system BIOS should NOT automatically control the brightness
 458  *                      level of the LCD, when the power changes from AC to DC.
 459  * Return Value:
 460  *              -1      wrong arg.
 461  */
 462
 463 static int
 464 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 465 {
 466         acpi_integer status = 0;
 467         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 468         struct acpi_object_list args = { 1, &arg0 };
 469
 470
 471         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 472                 status = -1;
 473                 goto Failed;
 474         }
 475         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 476         video->dos_setting = arg0.integer.value;
 477         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 478
 479       Failed:
 480         return status;
 481 }
 482
 483 /*
 484  *  Arg:
 485  *      device  : video output device (LCD, CRT, ..)
 486  *
 487  *  Return Value:
 488  *      None
 489  *
 490  *  Find out all required AML method defined under the output
 491  *  device.
 492  */
 493
 494 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 495 {
 496         acpi_integer status;
 497         acpi_handle h_dummy1;
 498         int i;
 499         union acpi_object *obj = NULL;
 500         struct acpi_video_device_brightness *br = NULL;
 501
 502
 503         memset(&device->cap, 0, 4);
 504
 505         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 506                 device->cap._ADR = 1;
 507         }
 508         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 509                 device->cap._BCL = 1;
 510         }
 511         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 512                 device->cap._BCM = 1;
 513         }
 514         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 515                 device->cap._DDC = 1;
 516         }
 517         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 518                 device->cap._DCS = 1;
 519         }
 520         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 521                 device->cap._DGS = 1;
 522         }
 523         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 524                 device->cap._DSS = 1;
 525         }
 526
 527         status = acpi_video_device_lcd_query_levels(device, &obj);
 528
 529         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 530                 int count = 0;
 531                 union acpi_object *o;
 532
 533                 br = kmalloc(sizeof(*br), GFP_KERNEL);
 534                 if (!br) {
 535                         printk(KERN_ERR "can't allocate memory\n");
 536                 } else {
 537                         memset(br, 0, sizeof(*br));
 538                         br->levels = kmalloc(obj->package.count *
 539                                              sizeof *(br->levels), GFP_KERNEL);
 540                         if (!br->levels)
 541                                 goto out;
 542
 543                         for (i = 0; i < obj->package.count; i++) {
 544                                 o = (union acpi_object *)&obj->package.
 545                                     elements[i];
 546                                 if (o->type != ACPI_TYPE_INTEGER) {
 547                                         printk(KERN_ERR PREFIX "Invalid data\n");
 548                                         continue;
 549                                 }
 550                                 br->levels[count] = (u32) o->integer.value;
 551                                 count++;
 552                         }
 553                       out:
 554                         if (count < 2) {
 555                                 kfree(br->levels);
 556                                 kfree(br);
 557                         } else {
 558                                 br->count = count;
 559                                 device->brightness = br;
 560                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 561                                                   "found %d brightness levels\n",
 562                                                   count));
 563                         }
 564                 }
 565         }
 566
 567         kfree(obj);
 568
 569         return;
 570 }
 571
 572 /*
 573  *  Arg:
 574  *      device  : video output device (VGA)
 575  *
 576  *  Return Value:
 577  *      None
 578  *
 579  *  Find out all required AML method defined under the video bus device.
 580  */
 581
 582 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 583 {
 584         acpi_handle h_dummy1;
 585
 586         memset(&video->cap, 0, 4);
 587         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 588                 video->cap._DOS = 1;
 589         }
 590         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 591                 video->cap._DOD = 1;
 592         }
 593         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 594                 video->cap._ROM = 1;
 595         }
 596         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 597                 video->cap._GPD = 1;
 598         }
 599         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 600                 video->cap._SPD = 1;
 601         }
 602         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 603                 video->cap._VPO = 1;
 604         }
 605 }
 606
 607 /*
 608  * Check whether the video bus device has required AML method to
 609  * support the desired features
 610  */
 611
 612 static int acpi_video_bus_check(struct acpi_video_bus *video)
 613 {
 614         acpi_status status = -ENOENT;
 615
 616
 617         if (!video)
 618                 return -EINVAL;
 619
 620         /* Since there is no HID, CID and so on for VGA driver, we have
 621          * to check well known required nodes.
 622          */
 623
 624         /* Does this device able to support video switching ? */
 625         if (video->cap._DOS) {
 626                 video->flags.multihead = 1;
 627                 status = 0;
 628         }
 629
 630         /* Does this device able to retrieve a retrieve a video ROM ? */
 631         if (video->cap._ROM) {
 632                 video->flags.rom = 1;
 633                 status = 0;
 634         }
 635
 636         /* Does this device able to configure which video device to POST ? */
 637         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 638                 video->flags.post = 1;
 639                 status = 0;
 640         }
 641
 642         return status;
 643 }
 644
 645 /* --------------------------------------------------------------------------
 646                               FS Interface (/proc)
 647    -------------------------------------------------------------------------- */
 648
 649 static struct proc_dir_entry *acpi_video_dir;
 650
 651 /* video devices */
 652
 653 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 654 {
 655         struct acpi_video_device *dev =
 656             (struct acpi_video_device *)seq->private;
 657
 658
 659         if (!dev)
 660                 goto end;
 661
 662         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 663         seq_printf(seq, "type:         ");
 664         if (dev->flags.crt)
 665                 seq_printf(seq, "CRT\n");
 666         else if (dev->flags.lcd)
 667                 seq_printf(seq, "LCD\n");
 668         else if (dev->flags.tvout)
 669                 seq_printf(seq, "TVOUT\n");
 670         else
 671                 seq_printf(seq, "UNKNOWN\n");
 672
 673         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 674
 675       end:
 676         return 0;
 677 }
 678
 679 static int
 680 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 681 {
 682         return single_open(file, acpi_video_device_info_seq_show,
 683                            PDE(inode)->data);
 684 }
 685
 686 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 687 {
 688         int status;
 689         struct acpi_video_device *dev =
 690             (struct acpi_video_device *)seq->private;
 691         unsigned long state;
 692
 693
 694         if (!dev)
 695                 goto end;
 696
 697         status = acpi_video_device_get_state(dev, &state);
 698         seq_printf(seq, "state:     ");
 699         if (ACPI_SUCCESS(status))
 700                 seq_printf(seq, "0x%02lx\n", state);
 701         else
 702                 seq_printf(seq, "<not supported>\n");
 703
 704         status = acpi_video_device_query(dev, &state);
 705         seq_printf(seq, "query:     ");
 706         if (ACPI_SUCCESS(status))
 707                 seq_printf(seq, "0x%02lx\n", state);
 708         else
 709                 seq_printf(seq, "<not supported>\n");
 710
 711       end:
 712         return 0;
 713 }
 714
 715 static int
 716 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 717 {
 718         return single_open(file, acpi_video_device_state_seq_show,
 719                            PDE(inode)->data);
 720 }
 721
 722 static ssize_t
 723 acpi_video_device_write_state(struct file *file,
 724                               const char __user * buffer,
 725                               size_t count, loff_t * data)
 726 {
 727         int status;
 728         struct seq_file *m = (struct seq_file *)file->private_data;
 729         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 730         char str[12] = { 0 };
 731         u32 state = 0;
 732
 733
 734         if (!dev || count + 1 > sizeof str)
 735                 return -EINVAL;
 736
 737         if (copy_from_user(str, buffer, count))
 738                 return -EFAULT;
 739
 740         str[count] = 0;
 741         state = simple_strtoul(str, NULL, 0);
 742         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 743
 744         status = acpi_video_device_set_state(dev, state);
 745
 746         if (status)
 747                 return -EFAULT;
 748
 749         return count;
 750 }
 751
 752 static int
 753 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 754 {
 755         struct acpi_video_device *dev =
 756             (struct acpi_video_device *)seq->private;
 757         int i;
 758
 759
 760         if (!dev || !dev->brightness) {
 761                 seq_printf(seq, "<not supported>\n");
 762                 return 0;
 763         }
 764
 765         seq_printf(seq, "levels: ");
 766         for (i = 0; i < dev->brightness->count; i++)
 767                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 768         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 769
 770         return 0;
 771 }
 772
 773 static int
 774 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 775 {
 776         return single_open(file, acpi_video_device_brightness_seq_show,
 777                            PDE(inode)->data);
 778 }
 779
 780 static ssize_t
 781 acpi_video_device_write_brightness(struct file *file,
 782                                    const char __user * buffer,
 783                                    size_t count, loff_t * data)
 784 {
 785         struct seq_file *m = (struct seq_file *)file->private_data;
 786         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 787         char str[4] = { 0 };
 788         unsigned int level = 0;
 789         int i;
 790
 791
 792         if (!dev || !dev->brightness || count + 1 > sizeof str)
 793                 return -EINVAL;
 794
 795         if (copy_from_user(str, buffer, count))
 796                 return -EFAULT;
 797
 798         str[count] = 0;
 799         level = simple_strtoul(str, NULL, 0);
 800
 801         if (level > 100)
 802                 return -EFAULT;
 803
 804         /* validate though the list of available levels */
 805         for (i = 0; i < dev->brightness->count; i++)
 806                 if (level == dev->brightness->levels[i]) {
 807                         if (ACPI_SUCCESS
 808                             (acpi_video_device_lcd_set_level(dev, level)))
 809                                 dev->brightness->curr = level;
 810                         break;
 811                 }
 812
 813         return count;
 814 }
 815
 816 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 817 {
 818         struct acpi_video_device *dev =
 819             (struct acpi_video_device *)seq->private;
 820         int status;
 821         int i;
 822         union acpi_object *edid = NULL;
 823
 824
 825         if (!dev)
 826                 goto out;
 827
 828         status = acpi_video_device_EDID(dev, &edid, 128);
 829         if (ACPI_FAILURE(status)) {
 830                 status = acpi_video_device_EDID(dev, &edid, 256);
 831         }
 832
 833         if (ACPI_FAILURE(status)) {
 834                 goto out;
 835         }
 836
 837         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 838                 for (i = 0; i < edid->buffer.length; i++)
 839                         seq_putc(seq, edid->buffer.pointer[i]);
 840         }
 841
 842       out:
 843         if (!edid)
 844                 seq_printf(seq, "<not supported>\n");
 845         else
 846                 kfree(edid);
 847
 848         return 0;
 849 }
 850
 851 static int
 852 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 853 {
 854         return single_open(file, acpi_video_device_EDID_seq_show,
 855                            PDE(inode)->data);
 856 }
 857
 858 static int acpi_video_device_add_fs(struct acpi_device *device)
 859 {
 860         struct proc_dir_entry *entry = NULL;
 861         struct acpi_video_device *vid_dev;
 862
 863
 864         if (!device)
 865                 return -ENODEV;
 866
 867         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 868         if (!vid_dev)
 869                 return -ENODEV;
 870
 871         if (!acpi_device_dir(device)) {
 872                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 873                                                      vid_dev->video->dir);
 874                 if (!acpi_device_dir(device))
 875                         return -ENODEV;
 876                 acpi_device_dir(device)->owner = THIS_MODULE;
 877         }
 878
 879         /* 'info' [R] */
 880         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 881         if (!entry)
 882                 return -ENODEV;
 883         else {
 884                 entry->proc_fops = &acpi_video_device_info_fops;
 885                 entry->data = acpi_driver_data(device);
 886                 entry->owner = THIS_MODULE;
 887         }
 888
 889         /* 'state' [R/W] */
 890         entry =
 891             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 892                               acpi_device_dir(device));
 893         if (!entry)
 894                 return -ENODEV;
 895         else {
 896                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 897                 entry->proc_fops = &acpi_video_device_state_fops;
 898                 entry->data = acpi_driver_data(device);
 899                 entry->owner = THIS_MODULE;
 900         }
 901
 902         /* 'brightness' [R/W] */
 903         entry =
 904             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 905                               acpi_device_dir(device));
 906         if (!entry)
 907                 return -ENODEV;
 908         else {
 909                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 910                 entry->proc_fops = &acpi_video_device_brightness_fops;
 911                 entry->data = acpi_driver_data(device);
 912                 entry->owner = THIS_MODULE;
 913         }
 914
 915         /* 'EDID' [R] */
 916         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 917         if (!entry)
 918                 return -ENODEV;
 919         else {
 920                 entry->proc_fops = &acpi_video_device_EDID_fops;
 921                 entry->data = acpi_driver_data(device);
 922                 entry->owner = THIS_MODULE;
 923         }
 924
 925         return 0;
 926 }
 927
 928 static int acpi_video_device_remove_fs(struct acpi_device *device)
 929 {
 930         struct acpi_video_device *vid_dev;
 931
 932         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 933         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 934                 return -ENODEV;
 935
 936         if (acpi_device_dir(device)) {
 937                 remove_proc_entry("info", acpi_device_dir(device));
 938                 remove_proc_entry("state", acpi_device_dir(device));
 939                 remove_proc_entry("brightness", acpi_device_dir(device));
 940                 remove_proc_entry("EDID", acpi_device_dir(device));
 941                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
 942                 acpi_device_dir(device) = NULL;
 943         }
 944
 945         return 0;
 946 }
 947
 948 /* video bus */
 949 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
 950 {
 951         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 952
 953
 954         if (!video)
 955                 goto end;
 956
 957         seq_printf(seq, "Switching heads:              %s\n",
 958                    video->flags.multihead ? "yes" : "no");
 959         seq_printf(seq, "Video ROM:                    %s\n",
 960                    video->flags.rom ? "yes" : "no");
 961         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
 962                    video->flags.post ? "yes" : "no");
 963
 964       end:
 965         return 0;
 966 }
 967
 968 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
 969 {
 970         return single_open(file, acpi_video_bus_info_seq_show,
 971                            PDE(inode)->data);
 972 }
 973
 974 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
 975 {
 976         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 977
 978
 979         if (!video)
 980                 goto end;
 981
 982         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
 983         seq_printf(seq, "<TODO>\n");
 984
 985       end:
 986         return 0;
 987 }
 988
 989 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
 990 {
 991         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
 992 }
 993
 994 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
 995 {
 996         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 997         unsigned long options;
 998         int status;
 999
1000
1001         if (!video)
1002                 goto end;
1003
1004         status = acpi_video_bus_POST_options(video, &options);
1005         if (ACPI_SUCCESS(status)) {
1006                 if (!(options & 1)) {
1007                         printk(KERN_WARNING PREFIX
1008                                "The motherboard VGA device is not listed as a possible POST device.\n");
1009                         printk(KERN_WARNING PREFIX
1010                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1011                 }
1012                 printk("%lx\n", options);
1013                 seq_printf(seq, "can POST: <intgrated video>");
1014                 if (options & 2)
1015                         seq_printf(seq, " <PCI video>");
1016                 if (options & 4)
1017                         seq_printf(seq, " <AGP video>");
1018                 seq_putc(seq, '\n');
1019         } else
1020                 seq_printf(seq, "<not supported>\n");
1021       end:
1022         return 0;
1023 }
1024
1025 static int
1026 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1027 {
1028         return single_open(file, acpi_video_bus_POST_info_seq_show,
1029                            PDE(inode)->data);
1030 }
1031
1032 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1033 {
1034         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1035         int status;
1036         unsigned long id;
1037
1038
1039         if (!video)
1040                 goto end;
1041
1042         status = acpi_video_bus_get_POST(video, &id);
1043         if (!ACPI_SUCCESS(status)) {
1044                 seq_printf(seq, "<not supported>\n");
1045                 goto end;
1046         }
1047         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1048
1049       end:
1050         return 0;
1051 }
1052
1053 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1054 {
1055         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1056
1057
1058         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1059
1060         return 0;
1061 }
1062
1063 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1064 {
1065         return single_open(file, acpi_video_bus_POST_seq_show,
1066                            PDE(inode)->data);
1067 }
1068
1069 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1070 {
1071         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1072 }
1073
1074 static ssize_t
1075 acpi_video_bus_write_POST(struct file *file,
1076                           const char __user * buffer,
1077                           size_t count, loff_t * data)
1078 {
1079         int status;
1080         struct seq_file *m = (struct seq_file *)file->private_data;
1081         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1082         char str[12] = { 0 };
1083         unsigned long opt, options;
1084
1085
1086         if (!video || count + 1 > sizeof str)
1087                 return -EINVAL;
1088
1089         status = acpi_video_bus_POST_options(video, &options);
1090         if (!ACPI_SUCCESS(status))
1091                 return -EINVAL;
1092
1093         if (copy_from_user(str, buffer, count))
1094                 return -EFAULT;
1095
1096         str[count] = 0;
1097         opt = strtoul(str, NULL, 0);
1098         if (opt > 3)
1099                 return -EFAULT;
1100
1101         /* just in case an OEM 'forget' the motherboard... */
1102         options |= 1;
1103
1104         if (options & (1ul << opt)) {
1105                 status = acpi_video_bus_set_POST(video, opt);
1106                 if (!ACPI_SUCCESS(status))
1107                         return -EFAULT;
1108
1109         }
1110
1111         return count;
1112 }
1113
1114 static ssize_t
1115 acpi_video_bus_write_DOS(struct file *file,
1116                          const char __user * buffer,
1117                          size_t count, loff_t * data)
1118 {
1119         int status;
1120         struct seq_file *m = (struct seq_file *)file->private_data;
1121         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1122         char str[12] = { 0 };
1123         unsigned long opt;
1124
1125
1126         if (!video || 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         opt = strtoul(str, NULL, 0);
1134         if (opt > 7)
1135                 return -EFAULT;
1136
1137         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1138
1139         if (!ACPI_SUCCESS(status))
1140                 return -EFAULT;
1141
1142         return count;
1143 }
1144
1145 static int acpi_video_bus_add_fs(struct acpi_device *device)
1146 {
1147         struct proc_dir_entry *entry = NULL;
1148         struct acpi_video_bus *video;
1149
1150
1151         video = (struct acpi_video_bus *)acpi_driver_data(device);
1152
1153         if (!acpi_device_dir(device)) {
1154                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1155                                                      acpi_video_dir);
1156                 if (!acpi_device_dir(device))
1157                         return -ENODEV;
1158                 video->dir = acpi_device_dir(device);
1159                 acpi_device_dir(device)->owner = THIS_MODULE;
1160         }
1161
1162         /* 'info' [R] */
1163         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1164         if (!entry)
1165                 return -ENODEV;
1166         else {
1167                 entry->proc_fops = &acpi_video_bus_info_fops;
1168                 entry->data = acpi_driver_data(device);
1169                 entry->owner = THIS_MODULE;
1170         }
1171
1172         /* 'ROM' [R] */
1173         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1174         if (!entry)
1175                 return -ENODEV;
1176         else {
1177                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1178                 entry->data = acpi_driver_data(device);
1179                 entry->owner = THIS_MODULE;
1180         }
1181
1182         /* 'POST_info' [R] */
1183         entry =
1184             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1185         if (!entry)
1186                 return -ENODEV;
1187         else {
1188                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1189                 entry->data = acpi_driver_data(device);
1190                 entry->owner = THIS_MODULE;
1191         }
1192
1193         /* 'POST' [R/W] */
1194         entry =
1195             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1196                               acpi_device_dir(device));
1197         if (!entry)
1198                 return -ENODEV;
1199         else {
1200                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1201                 entry->proc_fops = &acpi_video_bus_POST_fops;
1202                 entry->data = acpi_driver_data(device);
1203                 entry->owner = THIS_MODULE;
1204         }
1205
1206         /* 'DOS' [R/W] */
1207         entry =
1208             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1209                               acpi_device_dir(device));
1210         if (!entry)
1211                 return -ENODEV;
1212         else {
1213                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1214                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1215                 entry->data = acpi_driver_data(device);
1216                 entry->owner = THIS_MODULE;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1223 {
1224         struct acpi_video_bus *video;
1225
1226
1227         video = (struct acpi_video_bus *)acpi_driver_data(device);
1228
1229         if (acpi_device_dir(device)) {
1230                 remove_proc_entry("info", acpi_device_dir(device));
1231                 remove_proc_entry("ROM", acpi_device_dir(device));
1232                 remove_proc_entry("POST_info", acpi_device_dir(device));
1233                 remove_proc_entry("POST", acpi_device_dir(device));
1234                 remove_proc_entry("DOS", acpi_device_dir(device));
1235                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1236                 acpi_device_dir(device) = NULL;
1237         }
1238
1239         return 0;
1240 }
1241
1242 /* --------------------------------------------------------------------------
1243                                  Driver Interface
1244    -------------------------------------------------------------------------- */
1245
1246 /* device interface */
1247
1248 static int
1249 acpi_video_bus_get_one_device(struct acpi_device *device,
1250                               struct acpi_video_bus *video)
1251 {
1252         unsigned long device_id;
1253         int status;
1254         struct acpi_video_device *data;
1255
1256
1257         if (!device || !video)
1258                 return -EINVAL;
1259
1260         status =
1261             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1262         if (ACPI_SUCCESS(status)) {
1263
1264                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1265                 if (!data)
1266                         return -ENOMEM;
1267
1268                 memset(data, 0, sizeof(struct acpi_video_device));
1269
1270                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1271                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1272                 acpi_driver_data(device) = data;
1273
1274                 data->device_id = device_id;
1275                 data->video = video;
1276                 data->dev = device;
1277
1278                 switch (device_id & 0xffff) {
1279                 case 0x0100:
1280                         data->flags.crt = 1;
1281                         break;
1282                 case 0x0400:
1283                         data->flags.lcd = 1;
1284                         break;
1285                 case 0x0200:
1286                         data->flags.tvout = 1;
1287                         break;
1288                 default:
1289                         data->flags.unknown = 1;
1290                         break;
1291                 }
1292
1293                 acpi_video_device_bind(video, data);
1294                 acpi_video_device_find_cap(data);
1295
1296                 status = acpi_install_notify_handler(device->handle,
1297                                                      ACPI_DEVICE_NOTIFY,
1298                                                      acpi_video_device_notify,
1299                                                      data);
1300                 if (ACPI_FAILURE(status)) {
1301                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1302                                           "Error installing notify handler\n"));
1303                         if(data->brightness)
1304                                 kfree(data->brightness->levels);
1305                         kfree(data->brightness);
1306                         kfree(data);
1307                         return -ENODEV;
1308                 }
1309
1310                 down(&video->sem);
1311                 list_add_tail(&data->entry, &video->video_device_list);
1312                 up(&video->sem);
1313
1314                 acpi_video_device_add_fs(device);
1315
1316                 return 0;
1317         }
1318
1319         return -ENOENT;
1320 }
1321
1322 /*
1323  *  Arg:
1324  *      video   : video bus device
1325  *
1326  *  Return:
1327  *      none
1328  *
1329  *  Enumerate the video device list of the video bus,
1330  *  bind the ids with the corresponding video devices
1331  *  under the video bus.
1332  */
1333
1334 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1335 {
1336         struct list_head *node, *next;
1337         list_for_each_safe(node, next, &video->video_device_list) {
1338                 struct acpi_video_device *dev =
1339                     container_of(node, struct acpi_video_device, entry);
1340                 acpi_video_device_bind(video, dev);
1341         }
1342 }
1343
1344 /*
1345  *  Arg:
1346  *      video   : video bus device
1347  *      device  : video output device under the video
1348  *              bus
1349  *
1350  *  Return:
1351  *      none
1352  *
1353  *  Bind the ids with the corresponding video devices
1354  *  under the video bus.
1355  */
1356
1357 static void
1358 acpi_video_device_bind(struct acpi_video_bus *video,
1359                        struct acpi_video_device *device)
1360 {
1361         int i;
1362
1363 #define IDS_VAL(i) video->attached_array[i].value.int_val
1364 #define IDS_BIND(i) video->attached_array[i].bind_info
1365
1366         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1367              i < video->attached_count; i++) {
1368                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1369                         IDS_BIND(i) = device;
1370                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1371                 }
1372         }
1373 #undef IDS_VAL
1374 #undef IDS_BIND
1375 }
1376
1377 /*
1378  *  Arg:
1379  *      video   : video bus device
1380  *
1381  *  Return:
1382  *      < 0     : error
1383  *
1384  *  Call _DOD to enumerate all devices attached to display adapter
1385  *
1386  */
1387
1388 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1389 {
1390         int status;
1391         int count;
1392         int i;
1393         struct acpi_video_enumerated_device *active_device_list;
1394         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1395         union acpi_object *dod = NULL;
1396         union acpi_object *obj;
1397
1398         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1399         if (!ACPI_SUCCESS(status)) {
1400                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1401                 return status;
1402         }
1403
1404         dod = (union acpi_object *)buffer.pointer;
1405         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1406                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1407                 status = -EFAULT;
1408                 goto out;
1409         }
1410
1411         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1412                           dod->package.count));
1413
1414         active_device_list = kmalloc((1 +
1415                                       dod->package.count) *
1416                                      sizeof(struct
1417                                             acpi_video_enumerated_device),
1418                                      GFP_KERNEL);
1419
1420         if (!active_device_list) {
1421                 status = -ENOMEM;
1422                 goto out;
1423         }
1424
1425         count = 0;
1426         for (i = 0; i < dod->package.count; i++) {
1427                 obj = (union acpi_object *)&dod->package.elements[i];
1428
1429                 if (obj->type != ACPI_TYPE_INTEGER) {
1430                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1431                         active_device_list[i].value.int_val =
1432                             ACPI_VIDEO_HEAD_INVALID;
1433                 }
1434                 active_device_list[i].value.int_val = obj->integer.value;
1435                 active_device_list[i].bind_info = NULL;
1436                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1437                                   (int)obj->integer.value));
1438                 count++;
1439         }
1440         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1441
1442         kfree(video->attached_array);
1443
1444         video->attached_array = active_device_list;
1445         video->attached_count = count;
1446       out:
1447         kfree(buffer.pointer);
1448         return status;
1449 }
1450
1451 /*
1452  *  Arg:
1453  *      video   : video bus device
1454  *      event   : Nontify Event
1455  *
1456  *  Return:
1457  *      < 0     : error
1458  *
1459  *      1. Find out the current active output device.
1460  *      2. Identify the next output device to switch
1461  *      3. call _DSS to do actual switch.
1462  */
1463
1464 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1465 {
1466         struct list_head *node, *next;
1467         struct acpi_video_device *dev = NULL;
1468         struct acpi_video_device *dev_next = NULL;
1469         struct acpi_video_device *dev_prev = NULL;
1470         unsigned long state;
1471         int status = 0;
1472
1473
1474         list_for_each_safe(node, next, &video->video_device_list) {
1475                 dev = container_of(node, struct acpi_video_device, entry);
1476                 status = acpi_video_device_get_state(dev, &state);
1477                 if (state & 0x2) {
1478                         dev_next =
1479                             container_of(node->next, struct acpi_video_device,
1480                                          entry);
1481                         dev_prev =
1482                             container_of(node->prev, struct acpi_video_device,
1483                                          entry);
1484                         goto out;
1485                 }
1486         }
1487         dev_next = container_of(node->next, struct acpi_video_device, entry);
1488         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1489       out:
1490         switch (event) {
1491         case ACPI_VIDEO_NOTIFY_CYCLE:
1492         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1493                 acpi_video_device_set_state(dev, 0);
1494                 acpi_video_device_set_state(dev_next, 0x80000001);
1495                 break;
1496         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1497                 acpi_video_device_set_state(dev, 0);
1498                 acpi_video_device_set_state(dev_prev, 0x80000001);
1499         default:
1500                 break;
1501         }
1502
1503         return status;
1504 }
1505
1506 static int
1507 acpi_video_get_next_level(struct acpi_video_device *device,
1508                           u32 level_current, u32 event)
1509 {
1510         /*Fix me */
1511         return level_current;
1512 }
1513
1514 static void
1515 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1516 {
1517         unsigned long level_current, level_next;
1518         acpi_video_device_lcd_get_level_current(device, &level_current);
1519         level_next = acpi_video_get_next_level(device, level_current, event);
1520         acpi_video_device_lcd_set_level(device, level_next);
1521 }
1522
1523 static int
1524 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1525                            struct acpi_device *device)
1526 {
1527         int status = 0;
1528         struct list_head *node, *next;
1529
1530
1531         acpi_video_device_enumerate(video);
1532
1533         list_for_each_safe(node, next, &device->children) {
1534                 struct acpi_device *dev =
1535                     list_entry(node, struct acpi_device, node);
1536
1537                 if (!dev)
1538                         continue;
1539
1540                 status = acpi_video_bus_get_one_device(dev, video);
1541                 if (ACPI_FAILURE(status)) {
1542                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1543                         continue;
1544                 }
1545
1546         }
1547         return status;
1548 }
1549
1550 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1551 {
1552         acpi_status status;
1553         struct acpi_video_bus *video;
1554
1555
1556         if (!device || !device->video)
1557                 return -ENOENT;
1558
1559         video = device->video;
1560
1561         down(&video->sem);
1562         list_del(&device->entry);
1563         up(&video->sem);
1564         acpi_video_device_remove_fs(device->dev);
1565
1566         status = acpi_remove_notify_handler(device->dev->handle,
1567                                             ACPI_DEVICE_NOTIFY,
1568                                             acpi_video_device_notify);
1569
1570         return 0;
1571 }
1572
1573 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1574 {
1575         int status;
1576         struct list_head *node, *next;
1577
1578
1579         list_for_each_safe(node, next, &video->video_device_list) {
1580                 struct acpi_video_device *data =
1581                     list_entry(node, struct acpi_video_device, entry);
1582                 if (!data)
1583                         continue;
1584
1585                 status = acpi_video_bus_put_one_device(data);
1586                 if (ACPI_FAILURE(status))
1587                         printk(KERN_WARNING PREFIX
1588                                "hhuuhhuu bug in acpi video driver.\n");
1589
1590                 if (data->brightness)
1591                         kfree(data->brightness->levels);
1592                 kfree(data->brightness);
1593                 kfree(data);
1594         }
1595
1596         return 0;
1597 }
1598
1599 /* acpi_video interface */
1600
1601 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1602 {
1603         return acpi_video_bus_DOS(video, 1, 0);
1604 }
1605
1606 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1607 {
1608         return acpi_video_bus_DOS(video, 0, 1);
1609 }
1610
1611 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1612 {
1613         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1614         struct acpi_device *device = NULL;
1615
1616         printk("video bus notify\n");
1617
1618         if (!video)
1619                 return;
1620
1621         device = video->device;
1622
1623         switch (event) {
1624         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1625                                          * most likely via hotkey. */
1626                 acpi_bus_generate_event(device, event, 0);
1627                 break;
1628
1629         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1630                                          * connector. */
1631                 acpi_video_device_enumerate(video);
1632                 acpi_video_device_rebind(video);
1633                 acpi_video_switch_output(video, event);
1634                 acpi_bus_generate_event(device, event, 0);
1635                 break;
1636
1637         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1638         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1639         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1640                 acpi_video_switch_output(video, event);
1641                 acpi_bus_generate_event(device, event, 0);
1642                 break;
1643
1644         default:
1645                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1646                                   "Unsupported event [0x%x]\n", event));
1647                 break;
1648         }
1649
1650         return;
1651 }
1652
1653 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1654 {
1655         struct acpi_video_device *video_device =
1656             (struct acpi_video_device *)data;
1657         struct acpi_device *device = NULL;
1658
1659
1660         printk("video device notify\n");
1661         if (!video_device)
1662                 return;
1663
1664         device = video_device->dev;
1665
1666         switch (event) {
1667         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1668         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1669                 acpi_bus_generate_event(device, event, 0);
1670                 break;
1671         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1672         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1673         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1674         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1675         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1676                 acpi_video_switch_brightness(video_device, event);
1677                 acpi_bus_generate_event(device, event, 0);
1678                 break;
1679         default:
1680                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1681                                   "Unsupported event [0x%x]\n", event));
1682                 break;
1683         }
1684         return;
1685 }
1686
1687 static int acpi_video_bus_add(struct acpi_device *device)
1688 {
1689         int result = 0;
1690         acpi_status status = 0;
1691         struct acpi_video_bus *video = NULL;
1692
1693
1694         if (!device)
1695                 return -EINVAL;
1696
1697         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1698         if (!video)
1699                 return -ENOMEM;
1700         memset(video, 0, sizeof(struct acpi_video_bus));
1701
1702         video->device = device;
1703         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1704         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1705         acpi_driver_data(device) = video;
1706
1707         acpi_video_bus_find_cap(video);
1708         result = acpi_video_bus_check(video);
1709         if (result)
1710                 goto end;
1711
1712         result = acpi_video_bus_add_fs(device);
1713         if (result)
1714                 goto end;
1715
1716         init_MUTEX(&video->sem);
1717         INIT_LIST_HEAD(&video->video_device_list);
1718
1719         acpi_video_bus_get_devices(video, device);
1720         acpi_video_bus_start_devices(video);
1721
1722         status = acpi_install_notify_handler(device->handle,
1723                                              ACPI_DEVICE_NOTIFY,
1724                                              acpi_video_bus_notify, video);
1725         if (ACPI_FAILURE(status)) {
1726                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1727                                   "Error installing notify handler\n"));
1728                 acpi_video_bus_stop_devices(video);
1729                 acpi_video_bus_put_devices(video);
1730                 kfree(video->attached_array);
1731                 acpi_video_bus_remove_fs(device);
1732                 result = -ENODEV;
1733                 goto end;
1734         }
1735
1736         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1737                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1738                video->flags.multihead ? "yes" : "no",
1739                video->flags.rom ? "yes" : "no",
1740                video->flags.post ? "yes" : "no");
1741
1742       end:
1743         if (result)
1744                 kfree(video);
1745
1746         return result;
1747 }
1748
1749 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1750 {
1751         acpi_status status = 0;
1752         struct acpi_video_bus *video = NULL;
1753
1754
1755         if (!device || !acpi_driver_data(device))
1756                 return -EINVAL;
1757
1758         video = (struct acpi_video_bus *)acpi_driver_data(device);
1759
1760         acpi_video_bus_stop_devices(video);
1761
1762         status = acpi_remove_notify_handler(video->device->handle,
1763                                             ACPI_DEVICE_NOTIFY,
1764                                             acpi_video_bus_notify);
1765
1766         acpi_video_bus_put_devices(video);
1767         acpi_video_bus_remove_fs(device);
1768
1769         kfree(video->attached_array);
1770         kfree(video);
1771
1772         return 0;
1773 }
1774
1775 static int __init acpi_video_init(void)
1776 {
1777         int result = 0;
1778
1779
1780         /*
1781            acpi_dbg_level = 0xFFFFFFFF;
1782            acpi_dbg_layer = 0x08000000;
1783          */
1784
1785         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1786         if (!acpi_video_dir)
1787                 return -ENODEV;
1788         acpi_video_dir->owner = THIS_MODULE;
1789
1790         result = acpi_bus_register_driver(&acpi_video_bus);
1791         if (result < 0) {
1792                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1793                 return -ENODEV;
1794         }
1795
1796         return 0;
1797 }
1798
1799 static void __exit acpi_video_exit(void)
1800 {
1801
1802         acpi_bus_unregister_driver(&acpi_video_bus);
1803
1804         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1805
1806         return;
1807 }
1808
1809 module_init(acpi_video_init);
1810 module_exit(acpi_video_exit);