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 static int acpi_video_bus_match(struct acpi_device *device,
  69                                 struct acpi_driver *driver);
  70
  71 static struct acpi_driver acpi_video_bus = {
  72         .name = ACPI_VIDEO_DRIVER_NAME,
  73         .class = ACPI_VIDEO_CLASS,
  74         .ops = {
  75                 .add = acpi_video_bus_add,
  76                 .remove = acpi_video_bus_remove,
  77                 .match = acpi_video_bus_match,
  78                 },
  79 };
  80
  81 struct acpi_video_bus_flags {
  82         u8 multihead:1;         /* can switch video heads */
  83         u8 rom:1;               /* can retrieve a video rom */
  84         u8 post:1;              /* can configure the head to */
  85         u8 reserved:5;
  86 };
  87
  88 struct acpi_video_bus_cap {
  89         u8 _DOS:1;              /*Enable/Disable output switching */
  90         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
  91         u8 _ROM:1;              /*Get ROM Data */
  92         u8 _GPD:1;              /*Get POST Device */
  93         u8 _SPD:1;              /*Set POST Device */
  94         u8 _VPO:1;              /*Video POST Options */
  95         u8 reserved:2;
  96 };
  97
  98 struct acpi_video_device_attrib {
  99         u32 display_index:4;    /* A zero-based instance of the Display */
 100         u32 display_port_attachment:4;  /*This field differenates displays type */
 101         u32 display_type:4;     /*Describe the specific type in use */
 102         u32 vendor_specific:4;  /*Chipset Vendor Specifi */
 103         u32 bios_can_detect:1;  /*BIOS can detect the device */
 104         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 105                                    the VGA device. */
 106         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 107         u32 reserved:10;        /*Must be 0 */
 108         u32 device_id_scheme:1; /*Device ID Scheme */
 109 };
 110
 111 struct acpi_video_enumerated_device {
 112         union {
 113                 u32 int_val;
 114                 struct acpi_video_device_attrib attrib;
 115         } value;
 116         struct acpi_video_device *bind_info;
 117 };
 118
 119 struct acpi_video_bus {
 120         acpi_handle handle;
 121         struct acpi_device *device;
 122         u8 dos_setting;
 123         struct acpi_video_enumerated_device *attached_array;
 124         u8 attached_count;
 125         struct acpi_video_bus_cap cap;
 126         struct acpi_video_bus_flags flags;
 127         struct semaphore sem;
 128         struct list_head video_device_list;
 129         struct proc_dir_entry *dir;
 130 };
 131
 132 struct acpi_video_device_flags {
 133         u8 crt:1;
 134         u8 lcd:1;
 135         u8 tvout:1;
 136         u8 bios:1;
 137         u8 unknown:1;
 138         u8 reserved:3;
 139 };
 140
 141 struct acpi_video_device_cap {
 142         u8 _ADR:1;              /*Return the unique ID */
 143         u8 _BCL:1;              /*Query list of brightness control levels supported */
 144         u8 _BCM:1;              /*Set the brightness level */
 145         u8 _DDC:1;              /*Return the EDID for this device */
 146         u8 _DCS:1;              /*Return status of output device */
 147         u8 _DGS:1;              /*Query graphics state */
 148         u8 _DSS:1;              /*Device state set */
 149         u8 _reserved:1;
 150 };
 151
 152 struct acpi_video_device_brightness {
 153         int curr;
 154         int count;
 155         int *levels;
 156 };
 157
 158 struct acpi_video_device {
 159         acpi_handle handle;
 160         unsigned long device_id;
 161         struct acpi_video_device_flags flags;
 162         struct acpi_video_device_cap cap;
 163         struct list_head entry;
 164         struct acpi_video_bus *video;
 165         struct acpi_device *dev;
 166         struct acpi_video_device_brightness *brightness;
 167 };
 168
 169 /* bus */
 170 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 171 static struct file_operations acpi_video_bus_info_fops = {
 172         .open = acpi_video_bus_info_open_fs,
 173         .read = seq_read,
 174         .llseek = seq_lseek,
 175         .release = single_release,
 176 };
 177
 178 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 179 static struct file_operations acpi_video_bus_ROM_fops = {
 180         .open = acpi_video_bus_ROM_open_fs,
 181         .read = seq_read,
 182         .llseek = seq_lseek,
 183         .release = single_release,
 184 };
 185
 186 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 187                                             struct file *file);
 188 static struct file_operations acpi_video_bus_POST_info_fops = {
 189         .open = acpi_video_bus_POST_info_open_fs,
 190         .read = seq_read,
 191         .llseek = seq_lseek,
 192         .release = single_release,
 193 };
 194
 195 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 196 static struct file_operations acpi_video_bus_POST_fops = {
 197         .open = acpi_video_bus_POST_open_fs,
 198         .read = seq_read,
 199         .llseek = seq_lseek,
 200         .release = single_release,
 201 };
 202
 203 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 204 static struct file_operations acpi_video_bus_DOS_fops = {
 205         .open = acpi_video_bus_DOS_open_fs,
 206         .read = seq_read,
 207         .llseek = seq_lseek,
 208         .release = single_release,
 209 };
 210
 211 /* device */
 212 static int acpi_video_device_info_open_fs(struct inode *inode,
 213                                           struct file *file);
 214 static struct file_operations acpi_video_device_info_fops = {
 215         .open = acpi_video_device_info_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static int acpi_video_device_state_open_fs(struct inode *inode,
 222                                            struct file *file);
 223 static struct file_operations acpi_video_device_state_fops = {
 224         .open = acpi_video_device_state_open_fs,
 225         .read = seq_read,
 226         .llseek = seq_lseek,
 227         .release = single_release,
 228 };
 229
 230 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 231                                                 struct file *file);
 232 static struct file_operations acpi_video_device_brightness_fops = {
 233         .open = acpi_video_device_brightness_open_fs,
 234         .read = seq_read,
 235         .llseek = seq_lseek,
 236         .release = single_release,
 237 };
 238
 239 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 240                                           struct file *file);
 241 static struct file_operations acpi_video_device_EDID_fops = {
 242         .open = acpi_video_device_EDID_open_fs,
 243         .read = seq_read,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static char device_decode[][30] = {
 249         "motherboard VGA device",
 250         "PCI VGA device",
 251         "AGP VGA device",
 252         "UNKNOWN",
 253 };
 254
 255 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 256 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 257 static void acpi_video_device_bind(struct acpi_video_bus *video,
 258                                    struct acpi_video_device *device);
 259 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 260 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 261 static int acpi_video_get_next_level(struct acpi_video_device *device,
 262                                      u32 level_current, u32 event);
 263 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 264                                          int event);
 265
 266 /* --------------------------------------------------------------------------
 267                                Video Management
 268    -------------------------------------------------------------------------- */
 269
 270 /* device */
 271
 272 static int
 273 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 274 {
 275         int status;
 276         status = acpi_evaluate_integer(device->handle, "_DGS", NULL, state);
 277
 278         return status;
 279 }
 280
 281 static int
 282 acpi_video_device_get_state(struct acpi_video_device *device,
 283                             unsigned long *state)
 284 {
 285         int status;
 286
 287
 288         status = acpi_evaluate_integer(device->handle, "_DCS", NULL, state);
 289
 290         return status;
 291 }
 292
 293 static int
 294 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 295 {
 296         int status;
 297         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 298         struct acpi_object_list args = { 1, &arg0 };
 299         unsigned long ret;
 300
 301
 302         arg0.integer.value = state;
 303         status = acpi_evaluate_integer(device->handle, "_DSS", &args, &ret);
 304
 305         return status;
 306 }
 307
 308 static int
 309 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 310                                    union acpi_object **levels)
 311 {
 312         int status;
 313         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 314         union acpi_object *obj;
 315
 316
 317         *levels = NULL;
 318
 319         status = acpi_evaluate_object(device->handle, "_BCL", NULL, &buffer);
 320         if (!ACPI_SUCCESS(status))
 321                 return status;
 322         obj = (union acpi_object *)buffer.pointer;
 323         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 324                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 325                 status = -EFAULT;
 326                 goto err;
 327         }
 328
 329         *levels = obj;
 330
 331         return 0;
 332
 333       err:
 334         kfree(buffer.pointer);
 335
 336         return status;
 337 }
 338
 339 static int
 340 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 341 {
 342         int status;
 343         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 344         struct acpi_object_list args = { 1, &arg0 };
 345
 346
 347         arg0.integer.value = level;
 348         status = acpi_evaluate_object(device->handle, "_BCM", &args, NULL);
 349
 350         printk(KERN_DEBUG "set_level status: %x\n", status);
 351         return status;
 352 }
 353
 354 static int
 355 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 356                                         unsigned long *level)
 357 {
 358         int status;
 359
 360         status = acpi_evaluate_integer(device->handle, "_BQC", NULL, level);
 361
 362         return status;
 363 }
 364
 365 static int
 366 acpi_video_device_EDID(struct acpi_video_device *device,
 367                        union acpi_object **edid, ssize_t length)
 368 {
 369         int status;
 370         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 371         union acpi_object *obj;
 372         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 373         struct acpi_object_list args = { 1, &arg0 };
 374
 375
 376         *edid = NULL;
 377
 378         if (!device)
 379                 return -ENODEV;
 380         if (length == 128)
 381                 arg0.integer.value = 1;
 382         else if (length == 256)
 383                 arg0.integer.value = 2;
 384         else
 385                 return -EINVAL;
 386
 387         status = acpi_evaluate_object(device->handle, "_DDC", &args, &buffer);
 388         if (ACPI_FAILURE(status))
 389                 return -ENODEV;
 390
 391         obj = (union acpi_object *)buffer.pointer;
 392
 393         if (obj && obj->type == ACPI_TYPE_BUFFER)
 394                 *edid = obj;
 395         else {
 396                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 397                 status = -EFAULT;
 398                 kfree(obj);
 399         }
 400
 401         return status;
 402 }
 403
 404 /* bus */
 405
 406 static int
 407 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 408 {
 409         int status;
 410         unsigned long tmp;
 411         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 412         struct acpi_object_list args = { 1, &arg0 };
 413
 414
 415         arg0.integer.value = option;
 416
 417         status = acpi_evaluate_integer(video->handle, "_SPD", &args, &tmp);
 418         if (ACPI_SUCCESS(status))
 419                 status = tmp ? (-EINVAL) : (AE_OK);
 420
 421         return status;
 422 }
 423
 424 static int
 425 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 426 {
 427         int status;
 428
 429
 430         status = acpi_evaluate_integer(video->handle, "_GPD", NULL, id);
 431
 432         return status;
 433 }
 434
 435 static int
 436 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 437                             unsigned long *options)
 438 {
 439         int status;
 440
 441         status = acpi_evaluate_integer(video->handle, "_VPO", NULL, options);
 442         *options &= 3;
 443
 444         return status;
 445 }
 446
 447 /*
 448  *  Arg:
 449  *      video           : video bus device pointer
 450  *      bios_flag       :
 451  *              0.      The system BIOS should NOT automatically switch(toggle)
 452  *                      the active display output.
 453  *              1.      The system BIOS should automatically switch (toggle) the
 454  *                      active display output. No swich event.
 455  *              2.      The _DGS value should be locked.
 456  *              3.      The system BIOS should not automatically switch (toggle) the
 457  *                      active display output, but instead generate the display switch
 458  *                      event notify code.
 459  *      lcd_flag        :
 460  *              0.      The system BIOS should automatically control the brightness level
 461  *                      of the LCD, when the power changes from AC to DC
 462  *              1.      The system BIOS should NOT automatically control the brightness
 463  *                      level of the LCD, when the power changes from AC to DC.
 464  * Return Value:
 465  *              -1      wrong arg.
 466  */
 467
 468 static int
 469 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 470 {
 471         acpi_integer status = 0;
 472         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 473         struct acpi_object_list args = { 1, &arg0 };
 474
 475
 476         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 477                 status = -1;
 478                 goto Failed;
 479         }
 480         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 481         video->dos_setting = arg0.integer.value;
 482         acpi_evaluate_object(video->handle, "_DOS", &args, NULL);
 483
 484       Failed:
 485         return status;
 486 }
 487
 488 /*
 489  *  Arg:
 490  *      device  : video output device (LCD, CRT, ..)
 491  *
 492  *  Return Value:
 493  *      None
 494  *
 495  *  Find out all required AML method defined under the output
 496  *  device.
 497  */
 498
 499 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 500 {
 501         acpi_integer status;
 502         acpi_handle h_dummy1;
 503         int i;
 504         union acpi_object *obj = NULL;
 505         struct acpi_video_device_brightness *br = NULL;
 506
 507
 508         memset(&device->cap, 0, 4);
 509
 510         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ADR", &h_dummy1))) {
 511                 device->cap._ADR = 1;
 512         }
 513         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCL", &h_dummy1))) {
 514                 device->cap._BCL = 1;
 515         }
 516         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_BCM", &h_dummy1))) {
 517                 device->cap._BCM = 1;
 518         }
 519         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DDC", &h_dummy1))) {
 520                 device->cap._DDC = 1;
 521         }
 522         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DCS", &h_dummy1))) {
 523                 device->cap._DCS = 1;
 524         }
 525         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DGS", &h_dummy1))) {
 526                 device->cap._DGS = 1;
 527         }
 528         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DSS", &h_dummy1))) {
 529                 device->cap._DSS = 1;
 530         }
 531
 532         status = acpi_video_device_lcd_query_levels(device, &obj);
 533
 534         if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
 535                 int count = 0;
 536                 union acpi_object *o;
 537
 538                 br = kmalloc(sizeof(*br), GFP_KERNEL);
 539                 if (!br) {
 540                         printk(KERN_ERR "can't allocate memory\n");
 541                 } else {
 542                         memset(br, 0, sizeof(*br));
 543                         br->levels = kmalloc(obj->package.count *
 544                                              sizeof *(br->levels), GFP_KERNEL);
 545                         if (!br->levels)
 546                                 goto out;
 547
 548                         for (i = 0; i < obj->package.count; i++) {
 549                                 o = (union acpi_object *)&obj->package.
 550                                     elements[i];
 551                                 if (o->type != ACPI_TYPE_INTEGER) {
 552                                         printk(KERN_ERR PREFIX "Invalid data\n");
 553                                         continue;
 554                                 }
 555                                 br->levels[count] = (u32) o->integer.value;
 556                                 count++;
 557                         }
 558                       out:
 559                         if (count < 2) {
 560                                 kfree(br->levels);
 561                                 kfree(br);
 562                         } else {
 563                                 br->count = count;
 564                                 device->brightness = br;
 565                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 566                                                   "found %d brightness levels\n",
 567                                                   count));
 568                         }
 569                 }
 570         }
 571
 572         kfree(obj);
 573
 574         return;
 575 }
 576
 577 /*
 578  *  Arg:
 579  *      device  : video output device (VGA)
 580  *
 581  *  Return Value:
 582  *      None
 583  *
 584  *  Find out all required AML method defined under the video bus device.
 585  */
 586
 587 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 588 {
 589         acpi_handle h_dummy1;
 590
 591         memset(&video->cap, 0, 4);
 592         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOS", &h_dummy1))) {
 593                 video->cap._DOS = 1;
 594         }
 595         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_DOD", &h_dummy1))) {
 596                 video->cap._DOD = 1;
 597         }
 598         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_ROM", &h_dummy1))) {
 599                 video->cap._ROM = 1;
 600         }
 601         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_GPD", &h_dummy1))) {
 602                 video->cap._GPD = 1;
 603         }
 604         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_SPD", &h_dummy1))) {
 605                 video->cap._SPD = 1;
 606         }
 607         if (ACPI_SUCCESS(acpi_get_handle(video->handle, "_VPO", &h_dummy1))) {
 608                 video->cap._VPO = 1;
 609         }
 610 }
 611
 612 /*
 613  * Check whether the video bus device has required AML method to
 614  * support the desired features
 615  */
 616
 617 static int acpi_video_bus_check(struct acpi_video_bus *video)
 618 {
 619         acpi_status status = -ENOENT;
 620
 621
 622         if (!video)
 623                 return -EINVAL;
 624
 625         /* Since there is no HID, CID and so on for VGA driver, we have
 626          * to check well known required nodes.
 627          */
 628
 629         /* Does this device able to support video switching ? */
 630         if (video->cap._DOS) {
 631                 video->flags.multihead = 1;
 632                 status = 0;
 633         }
 634
 635         /* Does this device able to retrieve a retrieve a video ROM ? */
 636         if (video->cap._ROM) {
 637                 video->flags.rom = 1;
 638                 status = 0;
 639         }
 640
 641         /* Does this device able to configure which video device to POST ? */
 642         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 643                 video->flags.post = 1;
 644                 status = 0;
 645         }
 646
 647         return status;
 648 }
 649
 650 /* --------------------------------------------------------------------------
 651                               FS Interface (/proc)
 652    -------------------------------------------------------------------------- */
 653
 654 static struct proc_dir_entry *acpi_video_dir;
 655
 656 /* video devices */
 657
 658 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 659 {
 660         struct acpi_video_device *dev =
 661             (struct acpi_video_device *)seq->private;
 662
 663
 664         if (!dev)
 665                 goto end;
 666
 667         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 668         seq_printf(seq, "type:         ");
 669         if (dev->flags.crt)
 670                 seq_printf(seq, "CRT\n");
 671         else if (dev->flags.lcd)
 672                 seq_printf(seq, "LCD\n");
 673         else if (dev->flags.tvout)
 674                 seq_printf(seq, "TVOUT\n");
 675         else
 676                 seq_printf(seq, "UNKNOWN\n");
 677
 678         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 679
 680       end:
 681         return 0;
 682 }
 683
 684 static int
 685 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 686 {
 687         return single_open(file, acpi_video_device_info_seq_show,
 688                            PDE(inode)->data);
 689 }
 690
 691 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 692 {
 693         int status;
 694         struct acpi_video_device *dev =
 695             (struct acpi_video_device *)seq->private;
 696         unsigned long state;
 697
 698
 699         if (!dev)
 700                 goto end;
 701
 702         status = acpi_video_device_get_state(dev, &state);
 703         seq_printf(seq, "state:     ");
 704         if (ACPI_SUCCESS(status))
 705                 seq_printf(seq, "0x%02lx\n", state);
 706         else
 707                 seq_printf(seq, "<not supported>\n");
 708
 709         status = acpi_video_device_query(dev, &state);
 710         seq_printf(seq, "query:     ");
 711         if (ACPI_SUCCESS(status))
 712                 seq_printf(seq, "0x%02lx\n", state);
 713         else
 714                 seq_printf(seq, "<not supported>\n");
 715
 716       end:
 717         return 0;
 718 }
 719
 720 static int
 721 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 722 {
 723         return single_open(file, acpi_video_device_state_seq_show,
 724                            PDE(inode)->data);
 725 }
 726
 727 static ssize_t
 728 acpi_video_device_write_state(struct file *file,
 729                               const char __user * buffer,
 730                               size_t count, loff_t * data)
 731 {
 732         int status;
 733         struct seq_file *m = (struct seq_file *)file->private_data;
 734         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 735         char str[12] = { 0 };
 736         u32 state = 0;
 737
 738
 739         if (!dev || count + 1 > sizeof str)
 740                 return -EINVAL;
 741
 742         if (copy_from_user(str, buffer, count))
 743                 return -EFAULT;
 744
 745         str[count] = 0;
 746         state = simple_strtoul(str, NULL, 0);
 747         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 748
 749         status = acpi_video_device_set_state(dev, state);
 750
 751         if (status)
 752                 return -EFAULT;
 753
 754         return count;
 755 }
 756
 757 static int
 758 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 759 {
 760         struct acpi_video_device *dev =
 761             (struct acpi_video_device *)seq->private;
 762         int i;
 763
 764
 765         if (!dev || !dev->brightness) {
 766                 seq_printf(seq, "<not supported>\n");
 767                 return 0;
 768         }
 769
 770         seq_printf(seq, "levels: ");
 771         for (i = 0; i < dev->brightness->count; i++)
 772                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 773         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 774
 775         return 0;
 776 }
 777
 778 static int
 779 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 780 {
 781         return single_open(file, acpi_video_device_brightness_seq_show,
 782                            PDE(inode)->data);
 783 }
 784
 785 static ssize_t
 786 acpi_video_device_write_brightness(struct file *file,
 787                                    const char __user * buffer,
 788                                    size_t count, loff_t * data)
 789 {
 790         struct seq_file *m = (struct seq_file *)file->private_data;
 791         struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
 792         char str[4] = { 0 };
 793         unsigned int level = 0;
 794         int i;
 795
 796
 797         if (!dev || !dev->brightness || count + 1 > sizeof str)
 798                 return -EINVAL;
 799
 800         if (copy_from_user(str, buffer, count))
 801                 return -EFAULT;
 802
 803         str[count] = 0;
 804         level = simple_strtoul(str, NULL, 0);
 805
 806         if (level > 100)
 807                 return -EFAULT;
 808
 809         /* validate though the list of available levels */
 810         for (i = 0; i < dev->brightness->count; i++)
 811                 if (level == dev->brightness->levels[i]) {
 812                         if (ACPI_SUCCESS
 813                             (acpi_video_device_lcd_set_level(dev, level)))
 814                                 dev->brightness->curr = level;
 815                         break;
 816                 }
 817
 818         return count;
 819 }
 820
 821 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 822 {
 823         struct acpi_video_device *dev =
 824             (struct acpi_video_device *)seq->private;
 825         int status;
 826         int i;
 827         union acpi_object *edid = NULL;
 828
 829
 830         if (!dev)
 831                 goto out;
 832
 833         status = acpi_video_device_EDID(dev, &edid, 128);
 834         if (ACPI_FAILURE(status)) {
 835                 status = acpi_video_device_EDID(dev, &edid, 256);
 836         }
 837
 838         if (ACPI_FAILURE(status)) {
 839                 goto out;
 840         }
 841
 842         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 843                 for (i = 0; i < edid->buffer.length; i++)
 844                         seq_putc(seq, edid->buffer.pointer[i]);
 845         }
 846
 847       out:
 848         if (!edid)
 849                 seq_printf(seq, "<not supported>\n");
 850         else
 851                 kfree(edid);
 852
 853         return 0;
 854 }
 855
 856 static int
 857 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 858 {
 859         return single_open(file, acpi_video_device_EDID_seq_show,
 860                            PDE(inode)->data);
 861 }
 862
 863 static int acpi_video_device_add_fs(struct acpi_device *device)
 864 {
 865         struct proc_dir_entry *entry = NULL;
 866         struct acpi_video_device *vid_dev;
 867
 868
 869         if (!device)
 870                 return -ENODEV;
 871
 872         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 873         if (!vid_dev)
 874                 return -ENODEV;
 875
 876         if (!acpi_device_dir(device)) {
 877                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 878                                                      vid_dev->video->dir);
 879                 if (!acpi_device_dir(device))
 880                         return -ENODEV;
 881                 acpi_device_dir(device)->owner = THIS_MODULE;
 882         }
 883
 884         /* 'info' [R] */
 885         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 886         if (!entry)
 887                 return -ENODEV;
 888         else {
 889                 entry->proc_fops = &acpi_video_device_info_fops;
 890                 entry->data = acpi_driver_data(device);
 891                 entry->owner = THIS_MODULE;
 892         }
 893
 894         /* 'state' [R/W] */
 895         entry =
 896             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
 897                               acpi_device_dir(device));
 898         if (!entry)
 899                 return -ENODEV;
 900         else {
 901                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
 902                 entry->proc_fops = &acpi_video_device_state_fops;
 903                 entry->data = acpi_driver_data(device);
 904                 entry->owner = THIS_MODULE;
 905         }
 906
 907         /* 'brightness' [R/W] */
 908         entry =
 909             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
 910                               acpi_device_dir(device));
 911         if (!entry)
 912                 return -ENODEV;
 913         else {
 914                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
 915                 entry->proc_fops = &acpi_video_device_brightness_fops;
 916                 entry->data = acpi_driver_data(device);
 917                 entry->owner = THIS_MODULE;
 918         }
 919
 920         /* 'EDID' [R] */
 921         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
 922         if (!entry)
 923                 return -ENODEV;
 924         else {
 925                 entry->proc_fops = &acpi_video_device_EDID_fops;
 926                 entry->data = acpi_driver_data(device);
 927                 entry->owner = THIS_MODULE;
 928         }
 929
 930         return 0;
 931 }
 932
 933 static int acpi_video_device_remove_fs(struct acpi_device *device)
 934 {
 935         struct acpi_video_device *vid_dev;
 936
 937         vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
 938         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
 939                 return -ENODEV;
 940
 941         if (acpi_device_dir(device)) {
 942                 remove_proc_entry("info", acpi_device_dir(device));
 943                 remove_proc_entry("state", acpi_device_dir(device));
 944                 remove_proc_entry("brightness", acpi_device_dir(device));
 945                 remove_proc_entry("EDID", acpi_device_dir(device));
 946                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
 947                 acpi_device_dir(device) = NULL;
 948         }
 949
 950         return 0;
 951 }
 952
 953 /* video bus */
 954 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
 955 {
 956         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 957
 958
 959         if (!video)
 960                 goto end;
 961
 962         seq_printf(seq, "Switching heads:              %s\n",
 963                    video->flags.multihead ? "yes" : "no");
 964         seq_printf(seq, "Video ROM:                    %s\n",
 965                    video->flags.rom ? "yes" : "no");
 966         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
 967                    video->flags.post ? "yes" : "no");
 968
 969       end:
 970         return 0;
 971 }
 972
 973 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
 974 {
 975         return single_open(file, acpi_video_bus_info_seq_show,
 976                            PDE(inode)->data);
 977 }
 978
 979 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
 980 {
 981         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
 982
 983
 984         if (!video)
 985                 goto end;
 986
 987         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
 988         seq_printf(seq, "<TODO>\n");
 989
 990       end:
 991         return 0;
 992 }
 993
 994 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
 995 {
 996         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
 997 }
 998
 999 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1000 {
1001         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1002         unsigned long options;
1003         int status;
1004
1005
1006         if (!video)
1007                 goto end;
1008
1009         status = acpi_video_bus_POST_options(video, &options);
1010         if (ACPI_SUCCESS(status)) {
1011                 if (!(options & 1)) {
1012                         printk(KERN_WARNING PREFIX
1013                                "The motherboard VGA device is not listed as a possible POST device.\n");
1014                         printk(KERN_WARNING PREFIX
1015                                "This indicate a BIOS bug.  Please contact the manufacturer.\n");
1016                 }
1017                 printk("%lx\n", options);
1018                 seq_printf(seq, "can POST: <intgrated video>");
1019                 if (options & 2)
1020                         seq_printf(seq, " <PCI video>");
1021                 if (options & 4)
1022                         seq_printf(seq, " <AGP video>");
1023                 seq_putc(seq, '\n');
1024         } else
1025                 seq_printf(seq, "<not supported>\n");
1026       end:
1027         return 0;
1028 }
1029
1030 static int
1031 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1032 {
1033         return single_open(file, acpi_video_bus_POST_info_seq_show,
1034                            PDE(inode)->data);
1035 }
1036
1037 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1038 {
1039         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1040         int status;
1041         unsigned long id;
1042
1043
1044         if (!video)
1045                 goto end;
1046
1047         status = acpi_video_bus_get_POST(video, &id);
1048         if (!ACPI_SUCCESS(status)) {
1049                 seq_printf(seq, "<not supported>\n");
1050                 goto end;
1051         }
1052         seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
1053
1054       end:
1055         return 0;
1056 }
1057
1058 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1059 {
1060         struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
1061
1062
1063         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1064
1065         return 0;
1066 }
1067
1068 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1069 {
1070         return single_open(file, acpi_video_bus_POST_seq_show,
1071                            PDE(inode)->data);
1072 }
1073
1074 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1075 {
1076         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1077 }
1078
1079 static ssize_t
1080 acpi_video_bus_write_POST(struct file *file,
1081                           const char __user * buffer,
1082                           size_t count, loff_t * data)
1083 {
1084         int status;
1085         struct seq_file *m = (struct seq_file *)file->private_data;
1086         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1087         char str[12] = { 0 };
1088         unsigned long opt, options;
1089
1090
1091         if (!video || count + 1 > sizeof str)
1092                 return -EINVAL;
1093
1094         status = acpi_video_bus_POST_options(video, &options);
1095         if (!ACPI_SUCCESS(status))
1096                 return -EINVAL;
1097
1098         if (copy_from_user(str, buffer, count))
1099                 return -EFAULT;
1100
1101         str[count] = 0;
1102         opt = strtoul(str, NULL, 0);
1103         if (opt > 3)
1104                 return -EFAULT;
1105
1106         /* just in case an OEM 'forget' the motherboard... */
1107         options |= 1;
1108
1109         if (options & (1ul << opt)) {
1110                 status = acpi_video_bus_set_POST(video, opt);
1111                 if (!ACPI_SUCCESS(status))
1112                         return -EFAULT;
1113
1114         }
1115
1116         return count;
1117 }
1118
1119 static ssize_t
1120 acpi_video_bus_write_DOS(struct file *file,
1121                          const char __user * buffer,
1122                          size_t count, loff_t * data)
1123 {
1124         int status;
1125         struct seq_file *m = (struct seq_file *)file->private_data;
1126         struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
1127         char str[12] = { 0 };
1128         unsigned long opt;
1129
1130
1131         if (!video || count + 1 > sizeof str)
1132                 return -EINVAL;
1133
1134         if (copy_from_user(str, buffer, count))
1135                 return -EFAULT;
1136
1137         str[count] = 0;
1138         opt = strtoul(str, NULL, 0);
1139         if (opt > 7)
1140                 return -EFAULT;
1141
1142         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1143
1144         if (!ACPI_SUCCESS(status))
1145                 return -EFAULT;
1146
1147         return count;
1148 }
1149
1150 static int acpi_video_bus_add_fs(struct acpi_device *device)
1151 {
1152         struct proc_dir_entry *entry = NULL;
1153         struct acpi_video_bus *video;
1154
1155
1156         video = (struct acpi_video_bus *)acpi_driver_data(device);
1157
1158         if (!acpi_device_dir(device)) {
1159                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1160                                                      acpi_video_dir);
1161                 if (!acpi_device_dir(device))
1162                         return -ENODEV;
1163                 video->dir = acpi_device_dir(device);
1164                 acpi_device_dir(device)->owner = THIS_MODULE;
1165         }
1166
1167         /* 'info' [R] */
1168         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1169         if (!entry)
1170                 return -ENODEV;
1171         else {
1172                 entry->proc_fops = &acpi_video_bus_info_fops;
1173                 entry->data = acpi_driver_data(device);
1174                 entry->owner = THIS_MODULE;
1175         }
1176
1177         /* 'ROM' [R] */
1178         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1179         if (!entry)
1180                 return -ENODEV;
1181         else {
1182                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1183                 entry->data = acpi_driver_data(device);
1184                 entry->owner = THIS_MODULE;
1185         }
1186
1187         /* 'POST_info' [R] */
1188         entry =
1189             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1190         if (!entry)
1191                 return -ENODEV;
1192         else {
1193                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1194                 entry->data = acpi_driver_data(device);
1195                 entry->owner = THIS_MODULE;
1196         }
1197
1198         /* 'POST' [R/W] */
1199         entry =
1200             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1201                               acpi_device_dir(device));
1202         if (!entry)
1203                 return -ENODEV;
1204         else {
1205                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1206                 entry->proc_fops = &acpi_video_bus_POST_fops;
1207                 entry->data = acpi_driver_data(device);
1208                 entry->owner = THIS_MODULE;
1209         }
1210
1211         /* 'DOS' [R/W] */
1212         entry =
1213             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1214                               acpi_device_dir(device));
1215         if (!entry)
1216                 return -ENODEV;
1217         else {
1218                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1219                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1220                 entry->data = acpi_driver_data(device);
1221                 entry->owner = THIS_MODULE;
1222         }
1223
1224         return 0;
1225 }
1226
1227 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1228 {
1229         struct acpi_video_bus *video;
1230
1231
1232         video = (struct acpi_video_bus *)acpi_driver_data(device);
1233
1234         if (acpi_device_dir(device)) {
1235                 remove_proc_entry("info", acpi_device_dir(device));
1236                 remove_proc_entry("ROM", acpi_device_dir(device));
1237                 remove_proc_entry("POST_info", acpi_device_dir(device));
1238                 remove_proc_entry("POST", acpi_device_dir(device));
1239                 remove_proc_entry("DOS", acpi_device_dir(device));
1240                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1241                 acpi_device_dir(device) = NULL;
1242         }
1243
1244         return 0;
1245 }
1246
1247 /* --------------------------------------------------------------------------
1248                                  Driver Interface
1249    -------------------------------------------------------------------------- */
1250
1251 /* device interface */
1252
1253 static int
1254 acpi_video_bus_get_one_device(struct acpi_device *device,
1255                               struct acpi_video_bus *video)
1256 {
1257         unsigned long device_id;
1258         int status;
1259         struct acpi_video_device *data;
1260
1261
1262         if (!device || !video)
1263                 return -EINVAL;
1264
1265         status =
1266             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1267         if (ACPI_SUCCESS(status)) {
1268
1269                 data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1270                 if (!data)
1271                         return -ENOMEM;
1272
1273                 memset(data, 0, sizeof(struct acpi_video_device));
1274
1275                 data->handle = device->handle;
1276                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1277                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1278                 acpi_driver_data(device) = data;
1279
1280                 data->device_id = device_id;
1281                 data->video = video;
1282                 data->dev = device;
1283
1284                 switch (device_id & 0xffff) {
1285                 case 0x0100:
1286                         data->flags.crt = 1;
1287                         break;
1288                 case 0x0400:
1289                         data->flags.lcd = 1;
1290                         break;
1291                 case 0x0200:
1292                         data->flags.tvout = 1;
1293                         break;
1294                 default:
1295                         data->flags.unknown = 1;
1296                         break;
1297                 }
1298
1299                 acpi_video_device_bind(video, data);
1300                 acpi_video_device_find_cap(data);
1301
1302                 status = acpi_install_notify_handler(data->handle,
1303                                                      ACPI_DEVICE_NOTIFY,
1304                                                      acpi_video_device_notify,
1305                                                      data);
1306                 if (ACPI_FAILURE(status)) {
1307                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1308                                           "Error installing notify handler\n"));
1309                         if(data->brightness)
1310                                 kfree(data->brightness->levels);
1311                         kfree(data->brightness);
1312                         kfree(data);
1313                         return -ENODEV;
1314                 }
1315
1316                 down(&video->sem);
1317                 list_add_tail(&data->entry, &video->video_device_list);
1318                 up(&video->sem);
1319
1320                 acpi_video_device_add_fs(device);
1321
1322                 return 0;
1323         }
1324
1325         return -ENOENT;
1326 }
1327
1328 /*
1329  *  Arg:
1330  *      video   : video bus device
1331  *
1332  *  Return:
1333  *      none
1334  *
1335  *  Enumerate the video device list of the video bus,
1336  *  bind the ids with the corresponding video devices
1337  *  under the video bus.
1338  */
1339
1340 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1341 {
1342         struct list_head *node, *next;
1343         list_for_each_safe(node, next, &video->video_device_list) {
1344                 struct acpi_video_device *dev =
1345                     container_of(node, struct acpi_video_device, entry);
1346                 acpi_video_device_bind(video, dev);
1347         }
1348 }
1349
1350 /*
1351  *  Arg:
1352  *      video   : video bus device
1353  *      device  : video output device under the video
1354  *              bus
1355  *
1356  *  Return:
1357  *      none
1358  *
1359  *  Bind the ids with the corresponding video devices
1360  *  under the video bus.
1361  */
1362
1363 static void
1364 acpi_video_device_bind(struct acpi_video_bus *video,
1365                        struct acpi_video_device *device)
1366 {
1367         int i;
1368
1369 #define IDS_VAL(i) video->attached_array[i].value.int_val
1370 #define IDS_BIND(i) video->attached_array[i].bind_info
1371
1372         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1373              i < video->attached_count; i++) {
1374                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1375                         IDS_BIND(i) = device;
1376                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1377                 }
1378         }
1379 #undef IDS_VAL
1380 #undef IDS_BIND
1381 }
1382
1383 /*
1384  *  Arg:
1385  *      video   : video bus device
1386  *
1387  *  Return:
1388  *      < 0     : error
1389  *
1390  *  Call _DOD to enumerate all devices attached to display adapter
1391  *
1392  */
1393
1394 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1395 {
1396         int status;
1397         int count;
1398         int i;
1399         struct acpi_video_enumerated_device *active_device_list;
1400         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1401         union acpi_object *dod = NULL;
1402         union acpi_object *obj;
1403
1404
1405         status = acpi_evaluate_object(video->handle, "_DOD", NULL, &buffer);
1406         if (!ACPI_SUCCESS(status)) {
1407                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1408                 return status;
1409         }
1410
1411         dod = (union acpi_object *)buffer.pointer;
1412         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1413                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1414                 status = -EFAULT;
1415                 goto out;
1416         }
1417
1418         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1419                           dod->package.count));
1420
1421         active_device_list = kmalloc((1 +
1422                                       dod->package.count) *
1423                                      sizeof(struct
1424                                             acpi_video_enumerated_device),
1425                                      GFP_KERNEL);
1426
1427         if (!active_device_list) {
1428                 status = -ENOMEM;
1429                 goto out;
1430         }
1431
1432         count = 0;
1433         for (i = 0; i < dod->package.count; i++) {
1434                 obj = (union acpi_object *)&dod->package.elements[i];
1435
1436                 if (obj->type != ACPI_TYPE_INTEGER) {
1437                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1438                         active_device_list[i].value.int_val =
1439                             ACPI_VIDEO_HEAD_INVALID;
1440                 }
1441                 active_device_list[i].value.int_val = obj->integer.value;
1442                 active_device_list[i].bind_info = NULL;
1443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1444                                   (int)obj->integer.value));
1445                 count++;
1446         }
1447         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1448
1449         kfree(video->attached_array);
1450
1451         video->attached_array = active_device_list;
1452         video->attached_count = count;
1453       out:
1454         acpi_os_free(buffer.pointer);
1455         return status;
1456 }
1457
1458 /*
1459  *  Arg:
1460  *      video   : video bus device
1461  *      event   : Nontify Event
1462  *
1463  *  Return:
1464  *      < 0     : error
1465  *
1466  *      1. Find out the current active output device.
1467  *      2. Identify the next output device to switch
1468  *      3. call _DSS to do actual switch.
1469  */
1470
1471 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1472 {
1473         struct list_head *node, *next;
1474         struct acpi_video_device *dev = NULL;
1475         struct acpi_video_device *dev_next = NULL;
1476         struct acpi_video_device *dev_prev = NULL;
1477         unsigned long state;
1478         int status = 0;
1479
1480
1481         list_for_each_safe(node, next, &video->video_device_list) {
1482                 dev = container_of(node, struct acpi_video_device, entry);
1483                 status = acpi_video_device_get_state(dev, &state);
1484                 if (state & 0x2) {
1485                         dev_next =
1486                             container_of(node->next, struct acpi_video_device,
1487                                          entry);
1488                         dev_prev =
1489                             container_of(node->prev, struct acpi_video_device,
1490                                          entry);
1491                         goto out;
1492                 }
1493         }
1494         dev_next = container_of(node->next, struct acpi_video_device, entry);
1495         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1496       out:
1497         switch (event) {
1498         case ACPI_VIDEO_NOTIFY_CYCLE:
1499         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1500                 acpi_video_device_set_state(dev, 0);
1501                 acpi_video_device_set_state(dev_next, 0x80000001);
1502                 break;
1503         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1504                 acpi_video_device_set_state(dev, 0);
1505                 acpi_video_device_set_state(dev_prev, 0x80000001);
1506         default:
1507                 break;
1508         }
1509
1510         return status;
1511 }
1512
1513 static int
1514 acpi_video_get_next_level(struct acpi_video_device *device,
1515                           u32 level_current, u32 event)
1516 {
1517         /*Fix me */
1518         return level_current;
1519 }
1520
1521 static void
1522 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1523 {
1524         unsigned long level_current, level_next;
1525         acpi_video_device_lcd_get_level_current(device, &level_current);
1526         level_next = acpi_video_get_next_level(device, level_current, event);
1527         acpi_video_device_lcd_set_level(device, level_next);
1528 }
1529
1530 static int
1531 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1532                            struct acpi_device *device)
1533 {
1534         int status = 0;
1535         struct list_head *node, *next;
1536
1537
1538         acpi_video_device_enumerate(video);
1539
1540         list_for_each_safe(node, next, &device->children) {
1541                 struct acpi_device *dev =
1542                     list_entry(node, struct acpi_device, node);
1543
1544                 if (!dev)
1545                         continue;
1546
1547                 status = acpi_video_bus_get_one_device(dev, video);
1548                 if (ACPI_FAILURE(status)) {
1549                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1550                         continue;
1551                 }
1552
1553         }
1554         return status;
1555 }
1556
1557 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1558 {
1559         acpi_status status;
1560         struct acpi_video_bus *video;
1561
1562
1563         if (!device || !device->video)
1564                 return -ENOENT;
1565
1566         video = device->video;
1567
1568         down(&video->sem);
1569         list_del(&device->entry);
1570         up(&video->sem);
1571         acpi_video_device_remove_fs(device->dev);
1572
1573         status = acpi_remove_notify_handler(device->handle,
1574                                             ACPI_DEVICE_NOTIFY,
1575                                             acpi_video_device_notify);
1576
1577         return 0;
1578 }
1579
1580 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1581 {
1582         int status;
1583         struct list_head *node, *next;
1584
1585
1586         list_for_each_safe(node, next, &video->video_device_list) {
1587                 struct acpi_video_device *data =
1588                     list_entry(node, struct acpi_video_device, entry);
1589                 if (!data)
1590                         continue;
1591
1592                 status = acpi_video_bus_put_one_device(data);
1593                 if (ACPI_FAILURE(status))
1594                         printk(KERN_WARNING PREFIX
1595                                "hhuuhhuu bug in acpi video driver.\n");
1596
1597                 if (data->brightness)
1598                         kfree(data->brightness->levels);
1599                 kfree(data->brightness);
1600                 kfree(data);
1601         }
1602
1603         return 0;
1604 }
1605
1606 /* acpi_video interface */
1607
1608 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1609 {
1610         return acpi_video_bus_DOS(video, 1, 0);
1611 }
1612
1613 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1614 {
1615         return acpi_video_bus_DOS(video, 0, 1);
1616 }
1617
1618 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1619 {
1620         struct acpi_video_bus *video = (struct acpi_video_bus *)data;
1621         struct acpi_device *device = NULL;
1622
1623         printk("video bus notify\n");
1624
1625         if (!video)
1626                 return;
1627
1628         device = video->device;
1629
1630         switch (event) {
1631         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User request that a switch occur,
1632                                          * most likely via hotkey. */
1633                 acpi_bus_generate_event(device, event, 0);
1634                 break;
1635
1636         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plug or remove a video
1637                                          * connector. */
1638                 acpi_video_device_enumerate(video);
1639                 acpi_video_device_rebind(video);
1640                 acpi_video_switch_output(video, event);
1641                 acpi_bus_generate_event(device, event, 0);
1642                 break;
1643
1644         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1645         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1646         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1647                 acpi_video_switch_output(video, event);
1648                 acpi_bus_generate_event(device, event, 0);
1649                 break;
1650
1651         default:
1652                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1653                                   "Unsupported event [0x%x]\n", event));
1654                 break;
1655         }
1656
1657         return;
1658 }
1659
1660 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1661 {
1662         struct acpi_video_device *video_device =
1663             (struct acpi_video_device *)data;
1664         struct acpi_device *device = NULL;
1665
1666
1667         printk("video device notify\n");
1668         if (!video_device)
1669                 return;
1670
1671         device = video_device->dev;
1672
1673         switch (event) {
1674         case ACPI_VIDEO_NOTIFY_SWITCH:  /* change in status (cycle output device) */
1675         case ACPI_VIDEO_NOTIFY_PROBE:   /* change in status (output device status) */
1676                 acpi_bus_generate_event(device, event, 0);
1677                 break;
1678         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1679         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1680         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1681         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1682         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1683                 acpi_video_switch_brightness(video_device, event);
1684                 acpi_bus_generate_event(device, event, 0);
1685                 break;
1686         default:
1687                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1688                                   "Unsupported event [0x%x]\n", event));
1689                 break;
1690         }
1691         return;
1692 }
1693
1694 static int acpi_video_bus_add(struct acpi_device *device)
1695 {
1696         int result = 0;
1697         acpi_status status = 0;
1698         struct acpi_video_bus *video = NULL;
1699
1700
1701         if (!device)
1702                 return -EINVAL;
1703
1704         video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1705         if (!video)
1706                 return -ENOMEM;
1707         memset(video, 0, sizeof(struct acpi_video_bus));
1708
1709         video->handle = device->handle;
1710         video->device = device;
1711         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1712         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1713         acpi_driver_data(device) = video;
1714
1715         acpi_video_bus_find_cap(video);
1716         result = acpi_video_bus_check(video);
1717         if (result)
1718                 goto end;
1719
1720         result = acpi_video_bus_add_fs(device);
1721         if (result)
1722                 goto end;
1723
1724         init_MUTEX(&video->sem);
1725         INIT_LIST_HEAD(&video->video_device_list);
1726
1727         acpi_video_bus_get_devices(video, device);
1728         acpi_video_bus_start_devices(video);
1729
1730         status = acpi_install_notify_handler(video->handle,
1731                                              ACPI_DEVICE_NOTIFY,
1732                                              acpi_video_bus_notify, video);
1733         if (ACPI_FAILURE(status)) {
1734                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1735                                   "Error installing notify handler\n"));
1736                 acpi_video_bus_stop_devices(video);
1737                 acpi_video_bus_put_devices(video);
1738                 kfree(video->attached_array);
1739                 acpi_video_bus_remove_fs(device);
1740                 result = -ENODEV;
1741                 goto end;
1742         }
1743
1744         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1745                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1746                video->flags.multihead ? "yes" : "no",
1747                video->flags.rom ? "yes" : "no",
1748                video->flags.post ? "yes" : "no");
1749
1750       end:
1751         if (result)
1752                 kfree(video);
1753
1754         return result;
1755 }
1756
1757 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1758 {
1759         acpi_status status = 0;
1760         struct acpi_video_bus *video = NULL;
1761
1762
1763         if (!device || !acpi_driver_data(device))
1764                 return -EINVAL;
1765
1766         video = (struct acpi_video_bus *)acpi_driver_data(device);
1767
1768         acpi_video_bus_stop_devices(video);
1769
1770         status = acpi_remove_notify_handler(video->handle,
1771                                             ACPI_DEVICE_NOTIFY,
1772                                             acpi_video_bus_notify);
1773
1774         acpi_video_bus_put_devices(video);
1775         acpi_video_bus_remove_fs(device);
1776
1777         kfree(video->attached_array);
1778         kfree(video);
1779
1780         return 0;
1781 }
1782
1783 static int
1784 acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
1785 {
1786         acpi_handle h_dummy1;
1787         acpi_handle h_dummy2;
1788         acpi_handle h_dummy3;
1789
1790
1791         if (!device || !driver)
1792                 return -EINVAL;
1793
1794         /* Since there is no HID, CID for ACPI Video drivers, we have
1795          * to check well known required nodes for each feature we support.
1796          */
1797
1798         /* Does this device able to support video switching ? */
1799         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
1800             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
1801                 return 0;
1802
1803         /* Does this device able to retrieve a video ROM ? */
1804         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
1805                 return 0;
1806
1807         /* Does this device able to configure which video head to be POSTed ? */
1808         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
1809             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
1810             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
1811                 return 0;
1812
1813         return -ENODEV;
1814 }
1815
1816 static int __init acpi_video_init(void)
1817 {
1818         int result = 0;
1819
1820
1821         /*
1822            acpi_dbg_level = 0xFFFFFFFF;
1823            acpi_dbg_layer = 0x08000000;
1824          */
1825
1826         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
1827         if (!acpi_video_dir)
1828                 return -ENODEV;
1829         acpi_video_dir->owner = THIS_MODULE;
1830
1831         result = acpi_bus_register_driver(&acpi_video_bus);
1832         if (result < 0) {
1833                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1834                 return -ENODEV;
1835         }
1836
1837         return 0;
1838 }
1839
1840 static void __exit acpi_video_exit(void)
1841 {
1842
1843         acpi_bus_unregister_driver(&acpi_video_bus);
1844
1845         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
1846
1847         return;
1848 }
1849
1850 module_init(acpi_video_init);
1851 module_exit(acpi_video_exit);