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/mutex.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/slab.h>
  33 #include <asm/system.h>
  34 #include <linux/videodev2.h>
  35 #include <media/tuner.h>
  36 #include <media/v4l2-common.h>
  37
  38 #include "go7007-priv.h"
  39 #include "wis-i2c.h"
  40
  41 /*
  42  * Wait for an interrupt to be delivered from the GO7007SB and return
  43  * the associated value and data.
  44  *
  45  * Must be called with the hw_lock held.
  46  */
  47 int go7007_read_interrupt(struct go7007 *go, u16 *value, u16 *data)
  48 {
  49         go->interrupt_available = 0;
  50         go->hpi_ops->read_interrupt(go);
  51         if (wait_event_timeout(go->interrupt_waitq,
  52                                 go->interrupt_available, 5*HZ) < 0) {
  53                 v4l2_err(&go->v4l2_dev, "timeout waiting for read interrupt\n");
  54                 return -1;
  55         }
  56         if (!go->interrupt_available)
  57                 return -1;
  58         go->interrupt_available = 0;
  59         *value = go->interrupt_value & 0xfffe;
  60         *data = go->interrupt_data;
  61         return 0;
  62 }
  63 EXPORT_SYMBOL(go7007_read_interrupt);
  64
  65 /*
  66  * Read a register/address on the GO7007SB.
  67  *
  68  * Must be called with the hw_lock held.
  69  */
  70 int go7007_read_addr(struct go7007 *go, u16 addr, u16 *data)
  71 {
  72         int count = 100;
  73         u16 value;
  74
  75         if (go7007_write_interrupt(go, 0x0010, addr) < 0)
  76                 return -EIO;
  77         while (count-- > 0) {
  78                 if (go7007_read_interrupt(go, &value, data) == 0 &&
  79                                 value == 0xa000)
  80                         return 0;
  81         }
  82         return -EIO;
  83 }
  84 EXPORT_SYMBOL(go7007_read_addr);
  85
  86 /*
  87  * Send the boot firmware to the encoder, which just wakes it up and lets
  88  * us talk to the GPIO pins and on-board I2C adapter.
  89  *
  90  * Must be called with the hw_lock held.
  91  */
  92 static int go7007_load_encoder(struct go7007 *go)
  93 {
  94         const struct firmware *fw_entry;
  95         char fw_name[] = "go7007fw.bin";
  96         void *bounce;
  97         int fw_len, rv = 0;
  98         u16 intr_val, intr_data;
  99
 100         if (request_firmware(&fw_entry, fw_name, go->dev)) {
 101                 v4l2_err(go, "unable to load firmware from file "
 102                         "\"%s\"\n", fw_name);
 103                 return -1;
 104         }
 105         if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
 106                 v4l2_err(go, "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                 v4l2_err(go, "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                 v4l2_err(go, "error transferring firmware\n");
 126                 rv = -1;
 127         }
 128         kfree(bounce);
 129         return rv;
 130 }
 131
 132 MODULE_FIRMWARE("go7007fw.bin");
 133
 134 /*
 135  * Boot the encoder and register the I2C adapter if requested.  Do the
 136  * minimum initialization necessary, since the board-specific code may
 137  * still need to probe the board ID.
 138  *
 139  * Must NOT be called with the hw_lock held.
 140  */
 141 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
 142 {
 143         int ret;
 144
 145         mutex_lock(&go->hw_lock);
 146         ret = go7007_load_encoder(go);
 147         mutex_unlock(&go->hw_lock);
 148         if (ret < 0)
 149                 return -1;
 150         if (!init_i2c)
 151                 return 0;
 152         if (go7007_i2c_init(go) < 0)
 153                 return -1;
 154         go->i2c_adapter_online = 1;
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(go7007_boot_encoder);
 158
 159 /*
 160  * Configure any hardware-related registers in the GO7007, such as GPIO
 161  * pins and bus parameters, which are board-specific.  This assumes
 162  * the boot firmware has already been downloaded.
 163  *
 164  * Must be called with the hw_lock held.
 165  */
 166 static int go7007_init_encoder(struct go7007 *go)
 167 {
 168         if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
 169                 go7007_write_addr(go, 0x1000, 0x0811);
 170                 go7007_write_addr(go, 0x1000, 0x0c11);
 171         }
 172         if (go->board_id == GO7007_BOARDID_MATRIX_REV) {
 173                 /* Set GPIO pin 0 to be an output (audio clock control) */
 174                 go7007_write_addr(go, 0x3c82, 0x0001);
 175                 go7007_write_addr(go, 0x3c80, 0x00fe);
 176         }
 177         return 0;
 178 }
 179
 180 /*
 181  * Send the boot firmware to the GO7007 and configure the registers.  This
 182  * is the only way to stop the encoder once it has started streaming video.
 183  *
 184  * Must be called with the hw_lock held.
 185  */
 186 int go7007_reset_encoder(struct go7007 *go)
 187 {
 188         if (go7007_load_encoder(go) < 0)
 189                 return -1;
 190         return go7007_init_encoder(go);
 191 }
 192
 193 /*
 194  * Attempt to instantiate an I2C client by ID, probably loading a module.
 195  */
 196 static int init_i2c_module(struct i2c_adapter *adapter, const char *type,
 197                            int id, int addr)
 198 {
 199         struct go7007 *go = i2c_get_adapdata(adapter);
 200         struct v4l2_device *v4l2_dev = &go->v4l2_dev;
 201         char *modname;
 202
 203         switch (id) {
 204         case I2C_DRIVERID_WIS_SAA7115:
 205                 modname = "wis-saa7115";
 206                 break;
 207         case I2C_DRIVERID_WIS_SAA7113:
 208                 modname = "wis-saa7113";
 209                 break;
 210         case I2C_DRIVERID_WIS_UDA1342:
 211                 modname = "wis-uda1342";
 212                 break;
 213         case I2C_DRIVERID_WIS_SONY_TUNER:
 214                 modname = "wis-sony-tuner";
 215                 break;
 216         case I2C_DRIVERID_WIS_TW9903:
 217                 modname = "wis-tw9903";
 218                 break;
 219         case I2C_DRIVERID_WIS_TW2804:
 220                 modname = "wis-tw2804";
 221                 break;
 222         case I2C_DRIVERID_WIS_OV7640:
 223                 modname = "wis-ov7640";
 224                 break;
 225         case I2C_DRIVERID_S2250:
 226                 modname = "s2250";
 227                 break;
 228         default:
 229                 modname = NULL;
 230                 break;
 231         }
 232
 233         if (v4l2_i2c_new_subdev(v4l2_dev, adapter, modname, type, addr, NULL))
 234                 return 0;
 235
 236         if (modname != NULL)
 237                 printk(KERN_INFO
 238                         "go7007: probing for module %s failed\n", modname);
 239         else
 240                 printk(KERN_INFO
 241                         "go7007: sensor %u seems to be unsupported!\n", id);
 242         return -1;
 243 }
 244
 245 /*
 246  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 247  * (if used on this board), load the I2C client driver for the sensor
 248  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 249  * interfaces.
 250  *
 251  * Must NOT be called with the hw_lock held.
 252  */
 253 int go7007_register_encoder(struct go7007 *go)
 254 {
 255         int i, ret;
 256
 257         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 258
 259         mutex_lock(&go->hw_lock);
 260         ret = go7007_init_encoder(go);
 261         mutex_unlock(&go->hw_lock);
 262         if (ret < 0)
 263                 return -1;
 264
 265         /* v4l2 init must happen before i2c subdevs */
 266         ret = go7007_v4l2_init(go);
 267         if (ret < 0)
 268                 return ret;
 269
 270         if (!go->i2c_adapter_online &&
 271                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 272                 if (go7007_i2c_init(go) < 0)
 273                         return -1;
 274                 go->i2c_adapter_online = 1;
 275         }
 276         if (go->i2c_adapter_online) {
 277                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 278                         init_i2c_module(&go->i2c_adapter,
 279                                         go->board_info->i2c_devs[i].type,
 280                                         go->board_info->i2c_devs[i].id,
 281                                         go->board_info->i2c_devs[i].addr);
 282                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 283                         i2c_clients_command(&go->i2c_adapter,
 284                                 DECODER_SET_CHANNEL, &go->channel_number);
 285         }
 286         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 287                 go->audio_enabled = 1;
 288                 go7007_snd_init(go);
 289         }
 290         return 0;
 291 }
 292 EXPORT_SYMBOL(go7007_register_encoder);
 293
 294 /*
 295  * Send the encode firmware to the encoder, which will cause it
 296  * to immediately start delivering the video and audio streams.
 297  *
 298  * Must be called with the hw_lock held.
 299  */
 300 int go7007_start_encoder(struct go7007 *go)
 301 {
 302         u8 *fw;
 303         int fw_len, rv = 0, i;
 304         u16 intr_val, intr_data;
 305
 306         go->modet_enable = 0;
 307         if (!go->dvd_mode)
 308                 for (i = 0; i < 4; ++i) {
 309                         if (go->modet[i].enable) {
 310                                 go->modet_enable = 1;
 311                                 continue;
 312                         }
 313                         go->modet[i].pixel_threshold = 32767;
 314                         go->modet[i].motion_threshold = 32767;
 315                         go->modet[i].mb_threshold = 32767;
 316                 }
 317
 318         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 319                 return -1;
 320
 321         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 322                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 323                 v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
 324                 rv = -1;
 325                 goto start_error;
 326         }
 327
 328         go->state = STATE_DATA;
 329         go->parse_length = 0;
 330         go->seen_frame = 0;
 331         if (go7007_stream_start(go) < 0) {
 332                 v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
 333                 rv = -1;
 334                 goto start_error;
 335         }
 336
 337 start_error:
 338         kfree(fw);
 339         return rv;
 340 }
 341
 342 /*
 343  * Store a byte in the current video buffer, if there is one.
 344  */
 345 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 346 {
 347         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 348                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 349                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 350
 351                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 352                 ++gobuf->offset;
 353                 ++gobuf->bytesused;
 354         }
 355 }
 356
 357 /*
 358  * Deliver the last video buffer and get a new one to start writing to.
 359  */
 360 static void frame_boundary(struct go7007 *go)
 361 {
 362         struct go7007_buffer *gobuf;
 363         int i;
 364
 365         if (go->active_buf) {
 366                 if (go->active_buf->modet_active) {
 367                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 368                                 for (i = 0; i < 216; ++i)
 369                                         store_byte(go->active_buf,
 370                                                         go->active_map[i]);
 371                                 go->active_buf->bytesused -= 216;
 372                         } else
 373                                 go->active_buf->modet_active = 0;
 374                 }
 375                 go->active_buf->state = BUF_STATE_DONE;
 376                 wake_up_interruptible(&go->frame_waitq);
 377                 go->active_buf = NULL;
 378         }
 379         list_for_each_entry(gobuf, &go->stream, stream)
 380                 if (gobuf->state == BUF_STATE_QUEUED) {
 381                         gobuf->seq = go->next_seq;
 382                         do_gettimeofday(&gobuf->timestamp);
 383                         go->active_buf = gobuf;
 384                         break;
 385                 }
 386         ++go->next_seq;
 387 }
 388
 389 static void write_bitmap_word(struct go7007 *go)
 390 {
 391         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 392
 393         for (i = 0; i < 16; ++i) {
 394                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 395                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 396                 go->active_map[stride * y + (x >> 3)] |=
 397                                         (go->modet_word & 1) << (x & 0x7);
 398                 go->modet_word >>= 1;
 399         }
 400 }
 401
 402 /*
 403  * Parse a chunk of the video stream into frames.  The frames are not
 404  * delimited by the hardware, so we have to parse the frame boundaries
 405  * based on the type of video stream we're receiving.
 406  */
 407 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 408 {
 409         int i, seq_start_code = -1, frame_start_code = -1;
 410
 411         spin_lock(&go->spinlock);
 412
 413         switch (go->format) {
 414         case GO7007_FORMAT_MPEG4:
 415                 seq_start_code = 0xB0;
 416                 frame_start_code = 0xB6;
 417                 break;
 418         case GO7007_FORMAT_MPEG1:
 419         case GO7007_FORMAT_MPEG2:
 420                 seq_start_code = 0xB3;
 421                 frame_start_code = 0x00;
 422                 break;
 423         }
 424
 425         for (i = 0; i < length; ++i) {
 426                 if (go->active_buf != NULL &&
 427                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 428                         v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
 429                         go->active_buf->offset -= go->active_buf->bytesused;
 430                         go->active_buf->bytesused = 0;
 431                         go->active_buf->modet_active = 0;
 432                         go->active_buf = NULL;
 433                 }
 434
 435                 switch (go->state) {
 436                 case STATE_DATA:
 437                         switch (buf[i]) {
 438                         case 0x00:
 439                                 go->state = STATE_00;
 440                                 break;
 441                         case 0xFF:
 442                                 go->state = STATE_FF;
 443                                 break;
 444                         default:
 445                                 store_byte(go->active_buf, buf[i]);
 446                                 break;
 447                         }
 448                         break;
 449                 case STATE_00:
 450                         switch (buf[i]) {
 451                         case 0x00:
 452                                 go->state = STATE_00_00;
 453                                 break;
 454                         case 0xFF:
 455                                 store_byte(go->active_buf, 0x00);
 456                                 go->state = STATE_FF;
 457                                 break;
 458                         default:
 459                                 store_byte(go->active_buf, 0x00);
 460                                 store_byte(go->active_buf, buf[i]);
 461                                 go->state = STATE_DATA;
 462                                 break;
 463                         }
 464                         break;
 465                 case STATE_00_00:
 466                         switch (buf[i]) {
 467                         case 0x00:
 468                                 store_byte(go->active_buf, 0x00);
 469                                 /* go->state remains STATE_00_00 */
 470                                 break;
 471                         case 0x01:
 472                                 go->state = STATE_00_00_01;
 473                                 break;
 474                         case 0xFF:
 475                                 store_byte(go->active_buf, 0x00);
 476                                 store_byte(go->active_buf, 0x00);
 477                                 go->state = STATE_FF;
 478                                 break;
 479                         default:
 480                                 store_byte(go->active_buf, 0x00);
 481                                 store_byte(go->active_buf, 0x00);
 482                                 store_byte(go->active_buf, buf[i]);
 483                                 go->state = STATE_DATA;
 484                                 break;
 485                         }
 486                         break;
 487                 case STATE_00_00_01:
 488                         /* If this is the start of a new MPEG frame,
 489                          * get a new buffer */
 490                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 491                                         go->format == GO7007_FORMAT_MPEG2 ||
 492                                         go->format == GO7007_FORMAT_MPEG4) &&
 493                                         (buf[i] == seq_start_code ||
 494                                                 buf[i] == 0xB8 || /* GOP code */
 495                                                 buf[i] == frame_start_code)) {
 496                                 if (go->active_buf == NULL || go->seen_frame)
 497                                         frame_boundary(go);
 498                                 if (buf[i] == frame_start_code) {
 499                                         if (go->active_buf != NULL)
 500                                                 go->active_buf->frame_offset =
 501                                                         go->active_buf->offset;
 502                                         go->seen_frame = 1;
 503                                 } else {
 504                                         go->seen_frame = 0;
 505                                 }
 506                         }
 507                         /* Handle any special chunk types, or just write the
 508                          * start code to the (potentially new) buffer */
 509                         switch (buf[i]) {
 510                         case 0xF5: /* timestamp */
 511                                 go->parse_length = 12;
 512                                 go->state = STATE_UNPARSED;
 513                                 break;
 514                         case 0xF6: /* vbi */
 515                                 go->state = STATE_VBI_LEN_A;
 516                                 break;
 517                         case 0xF8: /* MD map */
 518                                 go->parse_length = 0;
 519                                 memset(go->active_map, 0,
 520                                                 sizeof(go->active_map));
 521                                 go->state = STATE_MODET_MAP;
 522                                 break;
 523                         case 0xFF: /* Potential JPEG start code */
 524                                 store_byte(go->active_buf, 0x00);
 525                                 store_byte(go->active_buf, 0x00);
 526                                 store_byte(go->active_buf, 0x01);
 527                                 go->state = STATE_FF;
 528                                 break;
 529                         default:
 530                                 store_byte(go->active_buf, 0x00);
 531                                 store_byte(go->active_buf, 0x00);
 532                                 store_byte(go->active_buf, 0x01);
 533                                 store_byte(go->active_buf, buf[i]);
 534                                 go->state = STATE_DATA;
 535                                 break;
 536                         }
 537                         break;
 538                 case STATE_FF:
 539                         switch (buf[i]) {
 540                         case 0x00:
 541                                 store_byte(go->active_buf, 0xFF);
 542                                 go->state = STATE_00;
 543                                 break;
 544                         case 0xFF:
 545                                 store_byte(go->active_buf, 0xFF);
 546                                 /* go->state remains STATE_FF */
 547                                 break;
 548                         case 0xD8:
 549                                 if (go->format == GO7007_FORMAT_MJPEG)
 550                                         frame_boundary(go);
 551                                 /* fall through */
 552                         default:
 553                                 store_byte(go->active_buf, 0xFF);
 554                                 store_byte(go->active_buf, buf[i]);
 555                                 go->state = STATE_DATA;
 556                                 break;
 557                         }
 558                         break;
 559                 case STATE_VBI_LEN_A:
 560                         go->parse_length = buf[i] << 8;
 561                         go->state = STATE_VBI_LEN_B;
 562                         break;
 563                 case STATE_VBI_LEN_B:
 564                         go->parse_length |= buf[i];
 565                         if (go->parse_length > 0)
 566                                 go->state = STATE_UNPARSED;
 567                         else
 568                                 go->state = STATE_DATA;
 569                         break;
 570                 case STATE_MODET_MAP:
 571                         if (go->parse_length < 204) {
 572                                 if (go->parse_length & 1) {
 573                                         go->modet_word |= buf[i];
 574                                         write_bitmap_word(go);
 575                                 } else
 576                                         go->modet_word = buf[i] << 8;
 577                         } else if (go->parse_length == 207 && go->active_buf) {
 578                                 go->active_buf->modet_active = buf[i];
 579                         }
 580                         if (++go->parse_length == 208)
 581                                 go->state = STATE_DATA;
 582                         break;
 583                 case STATE_UNPARSED:
 584                         if (--go->parse_length == 0)
 585                                 go->state = STATE_DATA;
 586                         break;
 587                 }
 588         }
 589
 590         spin_unlock(&go->spinlock);
 591 }
 592 EXPORT_SYMBOL(go7007_parse_video_stream);
 593
 594 /*
 595  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 596  */
 597 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 598 {
 599         struct go7007 *go;
 600         int i;
 601
 602         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 603         if (go == NULL)
 604                 return NULL;
 605         go->dev = dev;
 606         go->board_info = board;
 607         go->board_id = 0;
 608         go->tuner_type = -1;
 609         go->channel_number = 0;
 610         go->name[0] = 0;
 611         mutex_init(&go->hw_lock);
 612         init_waitqueue_head(&go->frame_waitq);
 613         spin_lock_init(&go->spinlock);
 614         go->video_dev = NULL;
 615         go->ref_count = 0;
 616         go->status = STATUS_INIT;
 617         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 618         go->i2c_adapter_online = 0;
 619         go->interrupt_available = 0;
 620         init_waitqueue_head(&go->interrupt_waitq);
 621         go->in_use = 0;
 622         go->input = 0;
 623         if (board->sensor_flags & GO7007_SENSOR_TV) {
 624                 go->standard = GO7007_STD_NTSC;
 625                 go->width = 720;
 626                 go->height = 480;
 627                 go->sensor_framerate = 30000;
 628         } else {
 629                 go->standard = GO7007_STD_OTHER;
 630                 go->width = board->sensor_width;
 631                 go->height = board->sensor_height;
 632                 go->sensor_framerate = board->sensor_framerate;
 633         }
 634         go->encoder_v_offset = board->sensor_v_offset;
 635         go->encoder_h_offset = board->sensor_h_offset;
 636         go->encoder_h_halve = 0;
 637         go->encoder_v_halve = 0;
 638         go->encoder_subsample = 0;
 639         go->streaming = 0;
 640         go->format = GO7007_FORMAT_MJPEG;
 641         go->bitrate = 1500000;
 642         go->fps_scale = 1;
 643         go->pali = 0;
 644         go->aspect_ratio = GO7007_RATIO_1_1;
 645         go->gop_size = 0;
 646         go->ipb = 0;
 647         go->closed_gop = 0;
 648         go->repeat_seqhead = 0;
 649         go->seq_header_enable = 0;
 650         go->gop_header_enable = 0;
 651         go->dvd_mode = 0;
 652         go->interlace_coding = 0;
 653         for (i = 0; i < 4; ++i)
 654                 go->modet[i].enable = 0;;
 655         for (i = 0; i < 1624; ++i)
 656                 go->modet_map[i] = 0;
 657         go->audio_deliver = NULL;
 658         go->audio_enabled = 0;
 659         INIT_LIST_HEAD(&go->stream);
 660
 661         return go;
 662 }
 663 EXPORT_SYMBOL(go7007_alloc);
 664
 665 /*
 666  * Detach and unregister the encoder.  The go7007 struct won't be freed
 667  * until v4l2 finishes releasing its resources and all associated fds are
 668  * closed by applications.
 669  */
 670 void go7007_remove(struct go7007 *go)
 671 {
 672         if (go->i2c_adapter_online) {
 673                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 674                         go->i2c_adapter_online = 0;
 675                 else
 676                         v4l2_err(&go->v4l2_dev,
 677                                 "error removing I2C adapter!\n");
 678         }
 679
 680         if (go->audio_enabled)
 681                 go7007_snd_remove(go);
 682         go7007_v4l2_remove(go);
 683 }
 684 EXPORT_SYMBOL(go7007_remove);
 685
 686 MODULE_LICENSE("GPL v2");