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/version.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/sched.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/unistd.h>
  25 #include <linux/time.h>
  26 #include <linux/mm.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/device.h>
  29 #include <linux/i2c.h>
  30 #include <linux/firmware.h>
  31 #include <linux/semaphore.h>
  32 #include <linux/uaccess.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                 printk(KERN_ERR "go7007: 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                 printk(KERN_ERR
 102                         "go7007: unable to load firmware from file \"%s\"\n",
 103                         fw_name);
 104                 return -1;
 105         }
 106         if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
 107                 printk(KERN_ERR "go7007: file \"%s\" does not appear to be "
 108                                 "go7007 firmware\n", fw_name);
 109                 release_firmware(fw_entry);
 110                 return -1;
 111         }
 112         fw_len = fw_entry->size - 16;
 113         bounce = kmalloc(fw_len, GFP_KERNEL);
 114         if (bounce == NULL) {
 115                 printk(KERN_ERR "go7007: unable to allocate %d bytes for "
 116                                 "firmware transfer\n", fw_len);
 117                 release_firmware(fw_entry);
 118                 return -1;
 119         }
 120         memcpy(bounce, fw_entry->data + 16, fw_len);
 121         release_firmware(fw_entry);
 122         if (go7007_interface_reset(go) < 0 ||
 123                         go7007_send_firmware(go, bounce, fw_len) < 0 ||
 124                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0 ||
 125                         (intr_val & ~0x1) != 0x5a5a) {
 126                 printk(KERN_ERR "go7007: error transferring firmware\n");
 127                 rv = -1;
 128         }
 129         kfree(bounce);
 130         return rv;
 131 }
 132
 133 /*
 134  * Boot the encoder and register the I2C adapter if requested.  Do the
 135  * minimum initialization necessary, since the board-specific code may
 136  * still need to probe the board ID.
 137  *
 138  * Must NOT be called with the hw_lock held.
 139  */
 140 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
 141 {
 142         int ret;
 143
 144         down(&go->hw_lock);
 145         ret = go7007_load_encoder(go);
 146         up(&go->hw_lock);
 147         if (ret < 0)
 148                 return -1;
 149         if (!init_i2c)
 150                 return 0;
 151         if (go7007_i2c_init(go) < 0)
 152                 return -1;
 153         go->i2c_adapter_online = 1;
 154         return 0;
 155 }
 156 EXPORT_SYMBOL(go7007_boot_encoder);
 157
 158 /*
 159  * Configure any hardware-related registers in the GO7007, such as GPIO
 160  * pins and bus parameters, which are board-specific.  This assumes
 161  * the boot firmware has already been downloaded.
 162  *
 163  * Must be called with the hw_lock held.
 164  */
 165 static int go7007_init_encoder(struct go7007 *go)
 166 {
 167         if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
 168                 go7007_write_addr(go, 0x1000, 0x0811);
 169                 go7007_write_addr(go, 0x1000, 0x0c11);
 170         }
 171         if (go->board_id == GO7007_BOARDID_MATRIX_REV) {
 172                 /* Set GPIO pin 0 to be an output (audio clock control) */
 173                 go7007_write_addr(go, 0x3c82, 0x0001);
 174                 go7007_write_addr(go, 0x3c80, 0x00fe);
 175         }
 176         return 0;
 177 }
 178
 179 /*
 180  * Send the boot firmware to the GO7007 and configure the registers.  This
 181  * is the only way to stop the encoder once it has started streaming video.
 182  *
 183  * Must be called with the hw_lock held.
 184  */
 185 int go7007_reset_encoder(struct go7007 *go)
 186 {
 187         if (go7007_load_encoder(go) < 0)
 188                 return -1;
 189         return go7007_init_encoder(go);
 190 }
 191
 192 /*
 193  * Attempt to instantiate an I2C client by ID, probably loading a module.
 194  */
 195 static int init_i2c_module(struct i2c_adapter *adapter, int id, int addr)
 196 {
 197         char *modname;
 198
 199         switch (id) {
 200         case I2C_DRIVERID_WIS_SAA7115:
 201                 modname = "wis-saa7115";
 202                 break;
 203         case I2C_DRIVERID_WIS_SAA7113:
 204                 modname = "wis-saa7113";
 205                 break;
 206         case I2C_DRIVERID_WIS_UDA1342:
 207                 modname = "wis-uda1342";
 208                 break;
 209         case I2C_DRIVERID_WIS_SONY_TUNER:
 210                 modname = "wis-sony-tuner";
 211                 break;
 212         case I2C_DRIVERID_WIS_TW9903:
 213                 modname = "wis-tw9903";
 214                 break;
 215         case I2C_DRIVERID_WIS_TW2804:
 216                 modname = "wis-tw2804";
 217                 break;
 218         case I2C_DRIVERID_WIS_OV7640:
 219                 modname = "wis-ov7640";
 220                 break;
 221         default:
 222                 modname = NULL;
 223                 break;
 224         }
 225         if (modname != NULL)
 226                 request_module(modname);
 227         if (wis_i2c_probe_device(adapter, id, addr) == 1)
 228                 return 0;
 229         if (modname != NULL)
 230                 printk(KERN_INFO
 231                         "go7007: probing for module %s failed", modname);
 232         else
 233                 printk(KERN_INFO
 234                         "go7007: sensor %u seems to be unsupported!\n", id);
 235         return -1;
 236 }
 237
 238 /*
 239  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 240  * (if used on this board), load the I2C client driver for the sensor
 241  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 242  * interfaces.
 243  *
 244  * Must NOT be called with the hw_lock held.
 245  */
 246 int go7007_register_encoder(struct go7007 *go)
 247 {
 248         int i, ret;
 249
 250         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 251
 252         down(&go->hw_lock);
 253         ret = go7007_init_encoder(go);
 254         up(&go->hw_lock);
 255         if (ret < 0)
 256                 return -1;
 257
 258         if (!go->i2c_adapter_online &&
 259                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 260                 if (go7007_i2c_init(go) < 0)
 261                         return -1;
 262                 go->i2c_adapter_online = 1;
 263         }
 264         if (go->i2c_adapter_online) {
 265                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 266                         init_i2c_module(&go->i2c_adapter,
 267                                         go->board_info->i2c_devs[i].id,
 268                                         go->board_info->i2c_devs[i].addr);
 269 #ifdef TUNER_SET_TYPE_ADDR
 270                 if (go->tuner_type >= 0) {
 271                         struct tuner_setup tun_setup = {
 272                                 .mode_mask      = T_ANALOG_TV,
 273                                 .addr           = ADDR_UNSET,
 274                                 .type           = go->tuner_type
 275                         };
 276                         i2c_clients_command(&go->i2c_adapter,
 277                                 TUNER_SET_TYPE_ADDR, &tun_setup);
 278                 }
 279 #else
 280                 if (go->tuner_type >= 0)
 281                         i2c_clients_command(&go->i2c_adapter,
 282                                 TUNER_SET_TYPE, &go->tuner_type);
 283 #endif
 284                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 285                         i2c_clients_command(&go->i2c_adapter,
 286                                 DECODER_SET_CHANNEL, &go->channel_number);
 287         }
 288         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 289                 go->audio_enabled = 1;
 290                 go7007_snd_init(go);
 291         }
 292         return go7007_v4l2_init(go);
 293 }
 294 EXPORT_SYMBOL(go7007_register_encoder);
 295
 296 /*
 297  * Send the encode firmware to the encoder, which will cause it
 298  * to immediately start delivering the video and audio streams.
 299  *
 300  * Must be called with the hw_lock held.
 301  */
 302 int go7007_start_encoder(struct go7007 *go)
 303 {
 304         u8 *fw;
 305         int fw_len, rv = 0, i;
 306         u16 intr_val, intr_data;
 307
 308         go->modet_enable = 0;
 309         if (!go->dvd_mode)
 310                 for (i = 0; i < 4; ++i) {
 311                         if (go->modet[i].enable) {
 312                                 go->modet_enable = 1;
 313                                 continue;
 314                         }
 315                         go->modet[i].pixel_threshold = 32767;
 316                         go->modet[i].motion_threshold = 32767;
 317                         go->modet[i].mb_threshold = 32767;
 318                 }
 319
 320         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 321                 return -1;
 322
 323         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 324                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 325                 printk(KERN_ERR "go7007: error transferring firmware\n");
 326                 rv = -1;
 327                 goto start_error;
 328         }
 329
 330         go->state = STATE_DATA;
 331         go->parse_length = 0;
 332         go->seen_frame = 0;
 333         if (go7007_stream_start(go) < 0) {
 334                 printk(KERN_ERR "go7007: error starting stream transfer\n");
 335                 rv = -1;
 336                 goto start_error;
 337         }
 338
 339 start_error:
 340         kfree(fw);
 341         return rv;
 342 }
 343
 344 /*
 345  * Store a byte in the current video buffer, if there is one.
 346  */
 347 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 348 {
 349         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 350                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 351                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 352
 353                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 354                 ++gobuf->offset;
 355                 ++gobuf->bytesused;
 356         }
 357 }
 358
 359 /*
 360  * Deliver the last video buffer and get a new one to start writing to.
 361  */
 362 static void frame_boundary(struct go7007 *go)
 363 {
 364         struct go7007_buffer *gobuf;
 365         int i;
 366
 367         if (go->active_buf) {
 368                 if (go->active_buf->modet_active) {
 369                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 370                                 for (i = 0; i < 216; ++i)
 371                                         store_byte(go->active_buf,
 372                                                         go->active_map[i]);
 373                                 go->active_buf->bytesused -= 216;
 374                         } else
 375                                 go->active_buf->modet_active = 0;
 376                 }
 377                 go->active_buf->state = BUF_STATE_DONE;
 378                 wake_up_interruptible(&go->frame_waitq);
 379                 go->active_buf = NULL;
 380         }
 381         list_for_each_entry(gobuf, &go->stream, stream)
 382                 if (gobuf->state == BUF_STATE_QUEUED) {
 383                         gobuf->seq = go->next_seq;
 384                         do_gettimeofday(&gobuf->timestamp);
 385                         go->active_buf = gobuf;
 386                         break;
 387                 }
 388         ++go->next_seq;
 389 }
 390
 391 static void write_bitmap_word(struct go7007 *go)
 392 {
 393         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 394
 395         for (i = 0; i < 16; ++i) {
 396                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 397                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 398                 go->active_map[stride * y + (x >> 3)] |=
 399                                         (go->modet_word & 1) << (x & 0x7);
 400                 go->modet_word >>= 1;
 401         }
 402 }
 403
 404 /*
 405  * Parse a chunk of the video stream into frames.  The frames are not
 406  * delimited by the hardware, so we have to parse the frame boundaries
 407  * based on the type of video stream we're receiving.
 408  */
 409 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 410 {
 411         int i, seq_start_code = -1, frame_start_code = -1;
 412
 413         spin_lock(&go->spinlock);
 414
 415         switch (go->format) {
 416         case GO7007_FORMAT_MPEG4:
 417                 seq_start_code = 0xB0;
 418                 frame_start_code = 0xB6;
 419                 break;
 420         case GO7007_FORMAT_MPEG1:
 421         case GO7007_FORMAT_MPEG2:
 422                 seq_start_code = 0xB3;
 423                 frame_start_code = 0x00;
 424                 break;
 425         }
 426
 427         for (i = 0; i < length; ++i) {
 428                 if (go->active_buf != NULL &&
 429                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 430                         printk(KERN_DEBUG "go7007: dropping oversized frame\n");
 431                         go->active_buf->offset -= go->active_buf->bytesused;
 432                         go->active_buf->bytesused = 0;
 433                         go->active_buf->modet_active = 0;
 434                         go->active_buf = NULL;
 435                 }
 436
 437                 switch (go->state) {
 438                 case STATE_DATA:
 439                         switch (buf[i]) {
 440                         case 0x00:
 441                                 go->state = STATE_00;
 442                                 break;
 443                         case 0xFF:
 444                                 go->state = STATE_FF;
 445                                 break;
 446                         default:
 447                                 store_byte(go->active_buf, buf[i]);
 448                                 break;
 449                         }
 450                         break;
 451                 case STATE_00:
 452                         switch (buf[i]) {
 453                         case 0x00:
 454                                 go->state = STATE_00_00;
 455                                 break;
 456                         case 0xFF:
 457                                 store_byte(go->active_buf, 0x00);
 458                                 go->state = STATE_FF;
 459                                 break;
 460                         default:
 461                                 store_byte(go->active_buf, 0x00);
 462                                 store_byte(go->active_buf, buf[i]);
 463                                 go->state = STATE_DATA;
 464                                 break;
 465                         }
 466                         break;
 467                 case STATE_00_00:
 468                         switch (buf[i]) {
 469                         case 0x00:
 470                                 store_byte(go->active_buf, 0x00);
 471                                 /* go->state remains STATE_00_00 */
 472                                 break;
 473                         case 0x01:
 474                                 go->state = STATE_00_00_01;
 475                                 break;
 476                         case 0xFF:
 477                                 store_byte(go->active_buf, 0x00);
 478                                 store_byte(go->active_buf, 0x00);
 479                                 go->state = STATE_FF;
 480                                 break;
 481                         default:
 482                                 store_byte(go->active_buf, 0x00);
 483                                 store_byte(go->active_buf, 0x00);
 484                                 store_byte(go->active_buf, buf[i]);
 485                                 go->state = STATE_DATA;
 486                                 break;
 487                         }
 488                         break;
 489                 case STATE_00_00_01:
 490                         /* If this is the start of a new MPEG frame,
 491                          * get a new buffer */
 492                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 493                                         go->format == GO7007_FORMAT_MPEG2 ||
 494                                         go->format == GO7007_FORMAT_MPEG4) &&
 495                                         (buf[i] == seq_start_code ||
 496                                                 buf[i] == 0xB8 || /* GOP code */
 497                                                 buf[i] == frame_start_code)) {
 498                                 if (go->active_buf == NULL || go->seen_frame)
 499                                         frame_boundary(go);
 500                                 if (buf[i] == frame_start_code) {
 501                                         if (go->active_buf != NULL)
 502                                                 go->active_buf->frame_offset =
 503                                                         go->active_buf->offset;
 504                                         go->seen_frame = 1;
 505                                 } else {
 506                                         go->seen_frame = 0;
 507                                 }
 508                         }
 509                         /* Handle any special chunk types, or just write the
 510                          * start code to the (potentially new) buffer */
 511                         switch (buf[i]) {
 512                         case 0xF5: /* timestamp */
 513                                 go->parse_length = 12;
 514                                 go->state = STATE_UNPARSED;
 515                                 break;
 516                         case 0xF6: /* vbi */
 517                                 go->state = STATE_VBI_LEN_A;
 518                                 break;
 519                         case 0xF8: /* MD map */
 520                                 go->parse_length = 0;
 521                                 memset(go->active_map, 0,
 522                                                 sizeof(go->active_map));
 523                                 go->state = STATE_MODET_MAP;
 524                                 break;
 525                         case 0xFF: /* Potential JPEG start code */
 526                                 store_byte(go->active_buf, 0x00);
 527                                 store_byte(go->active_buf, 0x00);
 528                                 store_byte(go->active_buf, 0x01);
 529                                 go->state = STATE_FF;
 530                                 break;
 531                         default:
 532                                 store_byte(go->active_buf, 0x00);
 533                                 store_byte(go->active_buf, 0x00);
 534                                 store_byte(go->active_buf, 0x01);
 535                                 store_byte(go->active_buf, buf[i]);
 536                                 go->state = STATE_DATA;
 537                                 break;
 538                         }
 539                         break;
 540                 case STATE_FF:
 541                         switch (buf[i]) {
 542                         case 0x00:
 543                                 store_byte(go->active_buf, 0xFF);
 544                                 go->state = STATE_00;
 545                                 break;
 546                         case 0xFF:
 547                                 store_byte(go->active_buf, 0xFF);
 548                                 /* go->state remains STATE_FF */
 549                                 break;
 550                         case 0xD8:
 551                                 if (go->format == GO7007_FORMAT_MJPEG)
 552                                         frame_boundary(go);
 553                                 /* fall through */
 554                         default:
 555                                 store_byte(go->active_buf, 0xFF);
 556                                 store_byte(go->active_buf, buf[i]);
 557                                 go->state = STATE_DATA;
 558                                 break;
 559                         }
 560                         break;
 561                 case STATE_VBI_LEN_A:
 562                         go->parse_length = buf[i] << 8;
 563                         go->state = STATE_VBI_LEN_B;
 564                         break;
 565                 case STATE_VBI_LEN_B:
 566                         go->parse_length |= buf[i];
 567                         if (go->parse_length > 0)
 568                                 go->state = STATE_UNPARSED;
 569                         else
 570                                 go->state = STATE_DATA;
 571                         break;
 572                 case STATE_MODET_MAP:
 573                         if (go->parse_length < 204) {
 574                                 if (go->parse_length & 1) {
 575                                         go->modet_word |= buf[i];
 576                                         write_bitmap_word(go);
 577                                 } else
 578                                         go->modet_word = buf[i] << 8;
 579                         } else if (go->parse_length == 207 && go->active_buf) {
 580                                 go->active_buf->modet_active = buf[i];
 581                         }
 582                         if (++go->parse_length == 208)
 583                                 go->state = STATE_DATA;
 584                         break;
 585                 case STATE_UNPARSED:
 586                         if (--go->parse_length == 0)
 587                                 go->state = STATE_DATA;
 588                         break;
 589                 }
 590         }
 591
 592         spin_unlock(&go->spinlock);
 593 }
 594 EXPORT_SYMBOL(go7007_parse_video_stream);
 595
 596 /*
 597  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 598  */
 599 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 600 {
 601         struct go7007 *go;
 602         int i;
 603
 604         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 605         if (go == NULL)
 606                 return NULL;
 607         go->dev = dev;
 608         go->board_info = board;
 609         go->board_id = 0;
 610         go->tuner_type = -1;
 611         go->channel_number = 0;
 612         go->name[0] = 0;
 613         init_MUTEX(&go->hw_lock);
 614         init_waitqueue_head(&go->frame_waitq);
 615         spin_lock_init(&go->spinlock);
 616         go->video_dev = NULL;
 617         go->ref_count = 0;
 618         go->status = STATUS_INIT;
 619         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 620         go->i2c_adapter_online = 0;
 621         go->interrupt_available = 0;
 622         init_waitqueue_head(&go->interrupt_waitq);
 623         go->in_use = 0;
 624         go->input = 0;
 625         if (board->sensor_flags & GO7007_SENSOR_TV) {
 626                 go->standard = GO7007_STD_NTSC;
 627                 go->width = 720;
 628                 go->height = 480;
 629                 go->sensor_framerate = 30000;
 630         } else {
 631                 go->standard = GO7007_STD_OTHER;
 632                 go->width = board->sensor_width;
 633                 go->height = board->sensor_height;
 634                 go->sensor_framerate = board->sensor_framerate;
 635         }
 636         go->encoder_v_offset = board->sensor_v_offset;
 637         go->encoder_h_offset = board->sensor_h_offset;
 638         go->encoder_h_halve = 0;
 639         go->encoder_v_halve = 0;
 640         go->encoder_subsample = 0;
 641         go->streaming = 0;
 642         go->format = GO7007_FORMAT_MJPEG;
 643         go->bitrate = 1500000;
 644         go->fps_scale = 1;
 645         go->pali = 0;
 646         go->aspect_ratio = GO7007_RATIO_1_1;
 647         go->gop_size = 0;
 648         go->ipb = 0;
 649         go->closed_gop = 0;
 650         go->repeat_seqhead = 0;
 651         go->seq_header_enable = 0;
 652         go->gop_header_enable = 0;
 653         go->dvd_mode = 0;
 654         go->interlace_coding = 0;
 655         for (i = 0; i < 4; ++i)
 656                 go->modet[i].enable = 0;;
 657         for (i = 0; i < 1624; ++i)
 658                 go->modet_map[i] = 0;
 659         go->audio_deliver = NULL;
 660         go->audio_enabled = 0;
 661         INIT_LIST_HEAD(&go->stream);
 662
 663         return go;
 664 }
 665 EXPORT_SYMBOL(go7007_alloc);
 666
 667 /*
 668  * Detach and unregister the encoder.  The go7007 struct won't be freed
 669  * until v4l2 finishes releasing its resources and all associated fds are
 670  * closed by applications.
 671  */
 672 void go7007_remove(struct go7007 *go)
 673 {
 674         if (go->i2c_adapter_online) {
 675                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 676                         go->i2c_adapter_online = 0;
 677                 else
 678                         printk(KERN_ERR
 679                                 "go7007: error removing I2C adapter!\n");
 680         }
 681
 682         if (go->audio_enabled)
 683                 go7007_snd_remove(go);
 684         go7007_v4l2_remove(go);
 685 }
 686 EXPORT_SYMBOL(go7007_remove);
 687
 688 MODULE_LICENSE("GPL v2");