git.oblomov.eu Git - linux-2.6/blob - drivers/staging/go7007/go7007-driver.c

   1 /*
   2  * Copyright (C) 2005-2006 Micronas USA Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License (Version 2) as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/sched.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/unistd.h>
  24 #include <linux/time.h>
  25 #include <linux/mm.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/device.h>
  28 #include <linux/i2c.h>
  29 #include <linux/firmware.h>
  30 #include <linux/semaphore.h>
  31 #include <linux/uaccess.h>
  32 #include <asm/system.h>
  33 #include <linux/videodev2.h>
  34 #include <media/tuner.h>
  35 #include <media/v4l2-common.h>
  36
  37 #include "go7007-priv.h"
  38 #include "wis-i2c.h"
  39
  40 /*
  41  * Wait for an interrupt to be delivered from the GO7007SB and return
  42  * the associated value and data.
  43  *
  44  * Must be called with the hw_lock held.
  45  */
  46 int go7007_read_interrupt(struct go7007 *go, u16 *value, u16 *data)
  47 {
  48         go->interrupt_available = 0;
  49         go->hpi_ops->read_interrupt(go);
  50         if (wait_event_timeout(go->interrupt_waitq,
  51                                 go->interrupt_available, 5*HZ) < 0) {
  52                 printk(KERN_ERR "go7007: timeout waiting for read interrupt\n");
  53                 return -1;
  54         }
  55         if (!go->interrupt_available)
  56                 return -1;
  57         go->interrupt_available = 0;
  58         *value = go->interrupt_value & 0xfffe;
  59         *data = go->interrupt_data;
  60         return 0;
  61 }
  62 EXPORT_SYMBOL(go7007_read_interrupt);
  63
  64 /*
  65  * Read a register/address on the GO7007SB.
  66  *
  67  * Must be called with the hw_lock held.
  68  */
  69 int go7007_read_addr(struct go7007 *go, u16 addr, u16 *data)
  70 {
  71         int count = 100;
  72         u16 value;
  73
  74         if (go7007_write_interrupt(go, 0x0010, addr) < 0)
  75                 return -EIO;
  76         while (count-- > 0) {
  77                 if (go7007_read_interrupt(go, &value, data) == 0 &&
  78                                 value == 0xa000)
  79                         return 0;
  80         }
  81         return -EIO;
  82 }
  83 EXPORT_SYMBOL(go7007_read_addr);
  84
  85 /*
  86  * Send the boot firmware to the encoder, which just wakes it up and lets
  87  * us talk to the GPIO pins and on-board I2C adapter.
  88  *
  89  * Must be called with the hw_lock held.
  90  */
  91 static int go7007_load_encoder(struct go7007 *go)
  92 {
  93         const struct firmware *fw_entry;
  94         char fw_name[] = "go7007fw.bin";
  95         void *bounce;
  96         int fw_len, rv = 0;
  97         u16 intr_val, intr_data;
  98
  99         if (request_firmware(&fw_entry, fw_name, go->dev)) {
 100                 printk(KERN_ERR
 101                         "go7007: unable to load firmware from file \"%s\"\n",
 102                         fw_name);
 103                 return -1;
 104         }
 105         if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
 106                 printk(KERN_ERR "go7007: file \"%s\" does not appear to be "
 107                                 "go7007 firmware\n", fw_name);
 108                 release_firmware(fw_entry);
 109                 return -1;
 110         }
 111         fw_len = fw_entry->size - 16;
 112         bounce = kmalloc(fw_len, GFP_KERNEL);
 113         if (bounce == NULL) {
 114                 printk(KERN_ERR "go7007: unable to allocate %d bytes for "
 115                                 "firmware transfer\n", fw_len);
 116                 release_firmware(fw_entry);
 117                 return -1;
 118         }
 119         memcpy(bounce, fw_entry->data + 16, fw_len);
 120         release_firmware(fw_entry);
 121         if (go7007_interface_reset(go) < 0 ||
 122                         go7007_send_firmware(go, bounce, fw_len) < 0 ||
 123                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0 ||
 124                         (intr_val & ~0x1) != 0x5a5a) {
 125                 printk(KERN_ERR "go7007: error transferring firmware\n");
 126                 rv = -1;
 127         }
 128         kfree(bounce);
 129         return rv;
 130 }
 131
 132 /*
 133  * Boot the encoder and register the I2C adapter if requested.  Do the
 134  * minimum initialization necessary, since the board-specific code may
 135  * still need to probe the board ID.
 136  *
 137  * Must NOT be called with the hw_lock held.
 138  */
 139 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
 140 {
 141         int ret;
 142
 143         down(&go->hw_lock);
 144         ret = go7007_load_encoder(go);
 145         up(&go->hw_lock);
 146         if (ret < 0)
 147                 return -1;
 148         if (!init_i2c)
 149                 return 0;
 150         if (go7007_i2c_init(go) < 0)
 151                 return -1;
 152         go->i2c_adapter_online = 1;
 153         return 0;
 154 }
 155 EXPORT_SYMBOL(go7007_boot_encoder);
 156
 157 /*
 158  * Configure any hardware-related registers in the GO7007, such as GPIO
 159  * pins and bus parameters, which are board-specific.  This assumes
 160  * the boot firmware has already been downloaded.
 161  *
 162  * Must be called with the hw_lock held.
 163  */
 164 static int go7007_init_encoder(struct go7007 *go)
 165 {
 166         if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
 167                 go7007_write_addr(go, 0x1000, 0x0811);
 168                 go7007_write_addr(go, 0x1000, 0x0c11);
 169         }
 170         if (go->board_id == GO7007_BOARDID_MATRIX_REV) {
 171                 /* Set GPIO pin 0 to be an output (audio clock control) */
 172                 go7007_write_addr(go, 0x3c82, 0x0001);
 173                 go7007_write_addr(go, 0x3c80, 0x00fe);
 174         }
 175         return 0;
 176 }
 177
 178 /*
 179  * Send the boot firmware to the GO7007 and configure the registers.  This
 180  * is the only way to stop the encoder once it has started streaming video.
 181  *
 182  * Must be called with the hw_lock held.
 183  */
 184 int go7007_reset_encoder(struct go7007 *go)
 185 {
 186         if (go7007_load_encoder(go) < 0)
 187                 return -1;
 188         return go7007_init_encoder(go);
 189 }
 190
 191 /*
 192  * Attempt to instantiate an I2C client by ID, probably loading a module.
 193  */
 194 static int init_i2c_module(struct i2c_adapter *adapter, const char *type,
 195                            int id, int addr)
 196 {
 197         struct i2c_board_info info;
 198         char *modname;
 199
 200         switch (id) {
 201         case I2C_DRIVERID_WIS_SAA7115:
 202                 modname = "wis-saa7115";
 203                 break;
 204         case I2C_DRIVERID_WIS_SAA7113:
 205                 modname = "wis-saa7113";
 206                 break;
 207         case I2C_DRIVERID_WIS_UDA1342:
 208                 modname = "wis-uda1342";
 209                 break;
 210         case I2C_DRIVERID_WIS_SONY_TUNER:
 211                 modname = "wis-sony-tuner";
 212                 break;
 213         case I2C_DRIVERID_WIS_TW9903:
 214                 modname = "wis-tw9903";
 215                 break;
 216         case I2C_DRIVERID_WIS_TW2804:
 217                 modname = "wis-tw2804";
 218                 break;
 219         case I2C_DRIVERID_WIS_OV7640:
 220                 modname = "wis-ov7640";
 221                 break;
 222         case I2C_DRIVERID_S2250:
 223                 modname = "s2250-board";
 224                 break;
 225         default:
 226                 modname = NULL;
 227                 break;
 228         }
 229         if (modname != NULL)
 230                 request_module(modname);
 231
 232         memset(&info, 0, sizeof(struct i2c_board_info));
 233         info.addr = addr;
 234         strlcpy(info.type, type, I2C_NAME_SIZE);
 235         if (!i2c_new_device(adapter, &info))
 236                 return 0;
 237         if (modname != NULL)
 238                 printk(KERN_INFO
 239                         "go7007: probing for module %s failed\n", modname);
 240         else
 241                 printk(KERN_INFO
 242                         "go7007: sensor %u seems to be unsupported!\n", id);
 243         return -1;
 244 }
 245
 246 /*
 247  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 248  * (if used on this board), load the I2C client driver for the sensor
 249  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 250  * interfaces.
 251  *
 252  * Must NOT be called with the hw_lock held.
 253  */
 254 int go7007_register_encoder(struct go7007 *go)
 255 {
 256         int i, ret;
 257
 258         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 259
 260         down(&go->hw_lock);
 261         ret = go7007_init_encoder(go);
 262         up(&go->hw_lock);
 263         if (ret < 0)
 264                 return -1;
 265
 266         if (!go->i2c_adapter_online &&
 267                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 268                 if (go7007_i2c_init(go) < 0)
 269                         return -1;
 270                 go->i2c_adapter_online = 1;
 271         }
 272         if (go->i2c_adapter_online) {
 273                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 274                         init_i2c_module(&go->i2c_adapter,
 275                                         go->board_info->i2c_devs[i].type,
 276                                         go->board_info->i2c_devs[i].id,
 277                                         go->board_info->i2c_devs[i].addr);
 278                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 279                         i2c_clients_command(&go->i2c_adapter,
 280                                 DECODER_SET_CHANNEL, &go->channel_number);
 281         }
 282         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 283                 go->audio_enabled = 1;
 284                 go7007_snd_init(go);
 285         }
 286         return go7007_v4l2_init(go);
 287 }
 288 EXPORT_SYMBOL(go7007_register_encoder);
 289
 290 /*
 291  * Send the encode firmware to the encoder, which will cause it
 292  * to immediately start delivering the video and audio streams.
 293  *
 294  * Must be called with the hw_lock held.
 295  */
 296 int go7007_start_encoder(struct go7007 *go)
 297 {
 298         u8 *fw;
 299         int fw_len, rv = 0, i;
 300         u16 intr_val, intr_data;
 301
 302         go->modet_enable = 0;
 303         if (!go->dvd_mode)
 304                 for (i = 0; i < 4; ++i) {
 305                         if (go->modet[i].enable) {
 306                                 go->modet_enable = 1;
 307                                 continue;
 308                         }
 309                         go->modet[i].pixel_threshold = 32767;
 310                         go->modet[i].motion_threshold = 32767;
 311                         go->modet[i].mb_threshold = 32767;
 312                 }
 313
 314         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 315                 return -1;
 316
 317         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 318                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 319                 printk(KERN_ERR "go7007: error transferring firmware\n");
 320                 rv = -1;
 321                 goto start_error;
 322         }
 323
 324         go->state = STATE_DATA;
 325         go->parse_length = 0;
 326         go->seen_frame = 0;
 327         if (go7007_stream_start(go) < 0) {
 328                 printk(KERN_ERR "go7007: error starting stream transfer\n");
 329                 rv = -1;
 330                 goto start_error;
 331         }
 332
 333 start_error:
 334         kfree(fw);
 335         return rv;
 336 }
 337
 338 /*
 339  * Store a byte in the current video buffer, if there is one.
 340  */
 341 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 342 {
 343         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 344                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 345                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 346
 347                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 348                 ++gobuf->offset;
 349                 ++gobuf->bytesused;
 350         }
 351 }
 352
 353 /*
 354  * Deliver the last video buffer and get a new one to start writing to.
 355  */
 356 static void frame_boundary(struct go7007 *go)
 357 {
 358         struct go7007_buffer *gobuf;
 359         int i;
 360
 361         if (go->active_buf) {
 362                 if (go->active_buf->modet_active) {
 363                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 364                                 for (i = 0; i < 216; ++i)
 365                                         store_byte(go->active_buf,
 366                                                         go->active_map[i]);
 367                                 go->active_buf->bytesused -= 216;
 368                         } else
 369                                 go->active_buf->modet_active = 0;
 370                 }
 371                 go->active_buf->state = BUF_STATE_DONE;
 372                 wake_up_interruptible(&go->frame_waitq);
 373                 go->active_buf = NULL;
 374         }
 375         list_for_each_entry(gobuf, &go->stream, stream)
 376                 if (gobuf->state == BUF_STATE_QUEUED) {
 377                         gobuf->seq = go->next_seq;
 378                         do_gettimeofday(&gobuf->timestamp);
 379                         go->active_buf = gobuf;
 380                         break;
 381                 }
 382         ++go->next_seq;
 383 }
 384
 385 static void write_bitmap_word(struct go7007 *go)
 386 {
 387         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 388
 389         for (i = 0; i < 16; ++i) {
 390                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 391                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 392                 go->active_map[stride * y + (x >> 3)] |=
 393                                         (go->modet_word & 1) << (x & 0x7);
 394                 go->modet_word >>= 1;
 395         }
 396 }
 397
 398 /*
 399  * Parse a chunk of the video stream into frames.  The frames are not
 400  * delimited by the hardware, so we have to parse the frame boundaries
 401  * based on the type of video stream we're receiving.
 402  */
 403 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 404 {
 405         int i, seq_start_code = -1, frame_start_code = -1;
 406
 407         spin_lock(&go->spinlock);
 408
 409         switch (go->format) {
 410         case GO7007_FORMAT_MPEG4:
 411                 seq_start_code = 0xB0;
 412                 frame_start_code = 0xB6;
 413                 break;
 414         case GO7007_FORMAT_MPEG1:
 415         case GO7007_FORMAT_MPEG2:
 416                 seq_start_code = 0xB3;
 417                 frame_start_code = 0x00;
 418                 break;
 419         }
 420
 421         for (i = 0; i < length; ++i) {
 422                 if (go->active_buf != NULL &&
 423                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 424                         printk(KERN_DEBUG "go7007: dropping oversized frame\n");
 425                         go->active_buf->offset -= go->active_buf->bytesused;
 426                         go->active_buf->bytesused = 0;
 427                         go->active_buf->modet_active = 0;
 428                         go->active_buf = NULL;
 429                 }
 430
 431                 switch (go->state) {
 432                 case STATE_DATA:
 433                         switch (buf[i]) {
 434                         case 0x00:
 435                                 go->state = STATE_00;
 436                                 break;
 437                         case 0xFF:
 438                                 go->state = STATE_FF;
 439                                 break;
 440                         default:
 441                                 store_byte(go->active_buf, buf[i]);
 442                                 break;
 443                         }
 444                         break;
 445                 case STATE_00:
 446                         switch (buf[i]) {
 447                         case 0x00:
 448                                 go->state = STATE_00_00;
 449                                 break;
 450                         case 0xFF:
 451                                 store_byte(go->active_buf, 0x00);
 452                                 go->state = STATE_FF;
 453                                 break;
 454                         default:
 455                                 store_byte(go->active_buf, 0x00);
 456                                 store_byte(go->active_buf, buf[i]);
 457                                 go->state = STATE_DATA;
 458                                 break;
 459                         }
 460                         break;
 461                 case STATE_00_00:
 462                         switch (buf[i]) {
 463                         case 0x00:
 464                                 store_byte(go->active_buf, 0x00);
 465                                 /* go->state remains STATE_00_00 */
 466                                 break;
 467                         case 0x01:
 468                                 go->state = STATE_00_00_01;
 469                                 break;
 470                         case 0xFF:
 471                                 store_byte(go->active_buf, 0x00);
 472                                 store_byte(go->active_buf, 0x00);
 473                                 go->state = STATE_FF;
 474                                 break;
 475                         default:
 476                                 store_byte(go->active_buf, 0x00);
 477                                 store_byte(go->active_buf, 0x00);
 478                                 store_byte(go->active_buf, buf[i]);
 479                                 go->state = STATE_DATA;
 480                                 break;
 481                         }
 482                         break;
 483                 case STATE_00_00_01:
 484                         /* If this is the start of a new MPEG frame,
 485                          * get a new buffer */
 486                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 487                                         go->format == GO7007_FORMAT_MPEG2 ||
 488                                         go->format == GO7007_FORMAT_MPEG4) &&
 489                                         (buf[i] == seq_start_code ||
 490                                                 buf[i] == 0xB8 || /* GOP code */
 491                                                 buf[i] == frame_start_code)) {
 492                                 if (go->active_buf == NULL || go->seen_frame)
 493                                         frame_boundary(go);
 494                                 if (buf[i] == frame_start_code) {
 495                                         if (go->active_buf != NULL)
 496                                                 go->active_buf->frame_offset =
 497                                                         go->active_buf->offset;
 498                                         go->seen_frame = 1;
 499                                 } else {
 500                                         go->seen_frame = 0;
 501                                 }
 502                         }
 503                         /* Handle any special chunk types, or just write the
 504                          * start code to the (potentially new) buffer */
 505                         switch (buf[i]) {
 506                         case 0xF5: /* timestamp */
 507                                 go->parse_length = 12;
 508                                 go->state = STATE_UNPARSED;
 509                                 break;
 510                         case 0xF6: /* vbi */
 511                                 go->state = STATE_VBI_LEN_A;
 512                                 break;
 513                         case 0xF8: /* MD map */
 514                                 go->parse_length = 0;
 515                                 memset(go->active_map, 0,
 516                                                 sizeof(go->active_map));
 517                                 go->state = STATE_MODET_MAP;
 518                                 break;
 519                         case 0xFF: /* Potential JPEG start code */
 520                                 store_byte(go->active_buf, 0x00);
 521                                 store_byte(go->active_buf, 0x00);
 522                                 store_byte(go->active_buf, 0x01);
 523                                 go->state = STATE_FF;
 524                                 break;
 525                         default:
 526                                 store_byte(go->active_buf, 0x00);
 527                                 store_byte(go->active_buf, 0x00);
 528                                 store_byte(go->active_buf, 0x01);
 529                                 store_byte(go->active_buf, buf[i]);
 530                                 go->state = STATE_DATA;
 531                                 break;
 532                         }
 533                         break;
 534                 case STATE_FF:
 535                         switch (buf[i]) {
 536                         case 0x00:
 537                                 store_byte(go->active_buf, 0xFF);
 538                                 go->state = STATE_00;
 539                                 break;
 540                         case 0xFF:
 541                                 store_byte(go->active_buf, 0xFF);
 542                                 /* go->state remains STATE_FF */
 543                                 break;
 544                         case 0xD8:
 545                                 if (go->format == GO7007_FORMAT_MJPEG)
 546                                         frame_boundary(go);
 547                                 /* fall through */
 548                         default:
 549                                 store_byte(go->active_buf, 0xFF);
 550                                 store_byte(go->active_buf, buf[i]);
 551                                 go->state = STATE_DATA;
 552                                 break;
 553                         }
 554                         break;
 555                 case STATE_VBI_LEN_A:
 556                         go->parse_length = buf[i] << 8;
 557                         go->state = STATE_VBI_LEN_B;
 558                         break;
 559                 case STATE_VBI_LEN_B:
 560                         go->parse_length |= buf[i];
 561                         if (go->parse_length > 0)
 562                                 go->state = STATE_UNPARSED;
 563                         else
 564                                 go->state = STATE_DATA;
 565                         break;
 566                 case STATE_MODET_MAP:
 567                         if (go->parse_length < 204) {
 568                                 if (go->parse_length & 1) {
 569                                         go->modet_word |= buf[i];
 570                                         write_bitmap_word(go);
 571                                 } else
 572                                         go->modet_word = buf[i] << 8;
 573                         } else if (go->parse_length == 207 && go->active_buf) {
 574                                 go->active_buf->modet_active = buf[i];
 575                         }
 576                         if (++go->parse_length == 208)
 577                                 go->state = STATE_DATA;
 578                         break;
 579                 case STATE_UNPARSED:
 580                         if (--go->parse_length == 0)
 581                                 go->state = STATE_DATA;
 582                         break;
 583                 }
 584         }
 585
 586         spin_unlock(&go->spinlock);
 587 }
 588 EXPORT_SYMBOL(go7007_parse_video_stream);
 589
 590 /*
 591  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 592  */
 593 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 594 {
 595         struct go7007 *go;
 596         int i;
 597
 598         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 599         if (go == NULL)
 600                 return NULL;
 601         go->dev = dev;
 602         go->board_info = board;
 603         go->board_id = 0;
 604         go->tuner_type = -1;
 605         go->channel_number = 0;
 606         go->name[0] = 0;
 607         init_MUTEX(&go->hw_lock);
 608         init_waitqueue_head(&go->frame_waitq);
 609         spin_lock_init(&go->spinlock);
 610         go->video_dev = NULL;
 611         go->ref_count = 0;
 612         go->status = STATUS_INIT;
 613         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 614         go->i2c_adapter_online = 0;
 615         go->interrupt_available = 0;
 616         init_waitqueue_head(&go->interrupt_waitq);
 617         go->in_use = 0;
 618         go->input = 0;
 619         if (board->sensor_flags & GO7007_SENSOR_TV) {
 620                 go->standard = GO7007_STD_NTSC;
 621                 go->width = 720;
 622                 go->height = 480;
 623                 go->sensor_framerate = 30000;
 624         } else {
 625                 go->standard = GO7007_STD_OTHER;
 626                 go->width = board->sensor_width;
 627                 go->height = board->sensor_height;
 628                 go->sensor_framerate = board->sensor_framerate;
 629         }
 630         go->encoder_v_offset = board->sensor_v_offset;
 631         go->encoder_h_offset = board->sensor_h_offset;
 632         go->encoder_h_halve = 0;
 633         go->encoder_v_halve = 0;
 634         go->encoder_subsample = 0;
 635         go->streaming = 0;
 636         go->format = GO7007_FORMAT_MJPEG;
 637         go->bitrate = 1500000;
 638         go->fps_scale = 1;
 639         go->pali = 0;
 640         go->aspect_ratio = GO7007_RATIO_1_1;
 641         go->gop_size = 0;
 642         go->ipb = 0;
 643         go->closed_gop = 0;
 644         go->repeat_seqhead = 0;
 645         go->seq_header_enable = 0;
 646         go->gop_header_enable = 0;
 647         go->dvd_mode = 0;
 648         go->interlace_coding = 0;
 649         for (i = 0; i < 4; ++i)
 650                 go->modet[i].enable = 0;;
 651         for (i = 0; i < 1624; ++i)
 652                 go->modet_map[i] = 0;
 653         go->audio_deliver = NULL;
 654         go->audio_enabled = 0;
 655         INIT_LIST_HEAD(&go->stream);
 656
 657         return go;
 658 }
 659 EXPORT_SYMBOL(go7007_alloc);
 660
 661 /*
 662  * Detach and unregister the encoder.  The go7007 struct won't be freed
 663  * until v4l2 finishes releasing its resources and all associated fds are
 664  * closed by applications.
 665  */
 666 void go7007_remove(struct go7007 *go)
 667 {
 668         if (go->i2c_adapter_online) {
 669                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 670                         go->i2c_adapter_online = 0;
 671                 else
 672                         printk(KERN_ERR
 673                                 "go7007: error removing I2C adapter!\n");
 674         }
 675
 676         if (go->audio_enabled)
 677                 go7007_snd_remove(go);
 678         go7007_v4l2_remove(go);
 679 }
 680 EXPORT_SYMBOL(go7007_remove);
 681
 682 MODULE_LICENSE("GPL v2");