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, int id, int addr)
 195 {
 196         char *modname;
 197
 198         switch (id) {
 199         case I2C_DRIVERID_WIS_SAA7115:
 200                 modname = "wis-saa7115";
 201                 break;
 202         case I2C_DRIVERID_WIS_SAA7113:
 203                 modname = "wis-saa7113";
 204                 break;
 205         case I2C_DRIVERID_WIS_UDA1342:
 206                 modname = "wis-uda1342";
 207                 break;
 208         case I2C_DRIVERID_WIS_SONY_TUNER:
 209                 modname = "wis-sony-tuner";
 210                 break;
 211         case I2C_DRIVERID_WIS_TW9903:
 212                 modname = "wis-tw9903";
 213                 break;
 214         case I2C_DRIVERID_WIS_TW2804:
 215                 modname = "wis-tw2804";
 216                 break;
 217         case I2C_DRIVERID_WIS_OV7640:
 218                 modname = "wis-ov7640";
 219                 break;
 220         case I2C_DRIVERID_S2250:
 221                 modname = "s2250-board";
 222                 break;
 223         default:
 224                 modname = NULL;
 225                 break;
 226         }
 227         if (modname != NULL)
 228                 request_module(modname);
 229         if (wis_i2c_probe_device(adapter, id, addr) == 1)
 230                 return 0;
 231         if (modname != NULL)
 232                 printk(KERN_INFO
 233                         "go7007: probing for module %s failed\n", modname);
 234         else
 235                 printk(KERN_INFO
 236                         "go7007: sensor %u seems to be unsupported!\n", id);
 237         return -1;
 238 }
 239
 240 /*
 241  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 242  * (if used on this board), load the I2C client driver for the sensor
 243  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 244  * interfaces.
 245  *
 246  * Must NOT be called with the hw_lock held.
 247  */
 248 int go7007_register_encoder(struct go7007 *go)
 249 {
 250         int i, ret;
 251
 252         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 253
 254         down(&go->hw_lock);
 255         ret = go7007_init_encoder(go);
 256         up(&go->hw_lock);
 257         if (ret < 0)
 258                 return -1;
 259
 260         if (!go->i2c_adapter_online &&
 261                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 262                 if (go7007_i2c_init(go) < 0)
 263                         return -1;
 264                 go->i2c_adapter_online = 1;
 265         }
 266         if (go->i2c_adapter_online) {
 267                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 268                         init_i2c_module(&go->i2c_adapter,
 269                                         go->board_info->i2c_devs[i].id,
 270                                         go->board_info->i2c_devs[i].addr);
 271 #ifdef TUNER_SET_TYPE_ADDR
 272                 if (go->tuner_type >= 0) {
 273                         struct tuner_setup tun_setup = {
 274                                 .mode_mask      = T_ANALOG_TV,
 275                                 .addr           = ADDR_UNSET,
 276                                 .type           = go->tuner_type
 277                         };
 278                         i2c_clients_command(&go->i2c_adapter,
 279                                 TUNER_SET_TYPE_ADDR, &tun_setup);
 280                 }
 281 #else
 282                 if (go->tuner_type >= 0)
 283                         i2c_clients_command(&go->i2c_adapter,
 284                                 TUNER_SET_TYPE, &go->tuner_type);
 285 #endif
 286                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 287                         i2c_clients_command(&go->i2c_adapter,
 288                                 DECODER_SET_CHANNEL, &go->channel_number);
 289         }
 290         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 291                 go->audio_enabled = 1;
 292                 go7007_snd_init(go);
 293         }
 294         return go7007_v4l2_init(go);
 295 }
 296 EXPORT_SYMBOL(go7007_register_encoder);
 297
 298 /*
 299  * Send the encode firmware to the encoder, which will cause it
 300  * to immediately start delivering the video and audio streams.
 301  *
 302  * Must be called with the hw_lock held.
 303  */
 304 int go7007_start_encoder(struct go7007 *go)
 305 {
 306         u8 *fw;
 307         int fw_len, rv = 0, i;
 308         u16 intr_val, intr_data;
 309
 310         go->modet_enable = 0;
 311         if (!go->dvd_mode)
 312                 for (i = 0; i < 4; ++i) {
 313                         if (go->modet[i].enable) {
 314                                 go->modet_enable = 1;
 315                                 continue;
 316                         }
 317                         go->modet[i].pixel_threshold = 32767;
 318                         go->modet[i].motion_threshold = 32767;
 319                         go->modet[i].mb_threshold = 32767;
 320                 }
 321
 322         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 323                 return -1;
 324
 325         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 326                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 327                 printk(KERN_ERR "go7007: error transferring firmware\n");
 328                 rv = -1;
 329                 goto start_error;
 330         }
 331
 332         go->state = STATE_DATA;
 333         go->parse_length = 0;
 334         go->seen_frame = 0;
 335         if (go7007_stream_start(go) < 0) {
 336                 printk(KERN_ERR "go7007: error starting stream transfer\n");
 337                 rv = -1;
 338                 goto start_error;
 339         }
 340
 341 start_error:
 342         kfree(fw);
 343         return rv;
 344 }
 345
 346 /*
 347  * Store a byte in the current video buffer, if there is one.
 348  */
 349 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 350 {
 351         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 352                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 353                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 354
 355                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 356                 ++gobuf->offset;
 357                 ++gobuf->bytesused;
 358         }
 359 }
 360
 361 /*
 362  * Deliver the last video buffer and get a new one to start writing to.
 363  */
 364 static void frame_boundary(struct go7007 *go)
 365 {
 366         struct go7007_buffer *gobuf;
 367         int i;
 368
 369         if (go->active_buf) {
 370                 if (go->active_buf->modet_active) {
 371                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 372                                 for (i = 0; i < 216; ++i)
 373                                         store_byte(go->active_buf,
 374                                                         go->active_map[i]);
 375                                 go->active_buf->bytesused -= 216;
 376                         } else
 377                                 go->active_buf->modet_active = 0;
 378                 }
 379                 go->active_buf->state = BUF_STATE_DONE;
 380                 wake_up_interruptible(&go->frame_waitq);
 381                 go->active_buf = NULL;
 382         }
 383         list_for_each_entry(gobuf, &go->stream, stream)
 384                 if (gobuf->state == BUF_STATE_QUEUED) {
 385                         gobuf->seq = go->next_seq;
 386                         do_gettimeofday(&gobuf->timestamp);
 387                         go->active_buf = gobuf;
 388                         break;
 389                 }
 390         ++go->next_seq;
 391 }
 392
 393 static void write_bitmap_word(struct go7007 *go)
 394 {
 395         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 396
 397         for (i = 0; i < 16; ++i) {
 398                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 399                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 400                 go->active_map[stride * y + (x >> 3)] |=
 401                                         (go->modet_word & 1) << (x & 0x7);
 402                 go->modet_word >>= 1;
 403         }
 404 }
 405
 406 /*
 407  * Parse a chunk of the video stream into frames.  The frames are not
 408  * delimited by the hardware, so we have to parse the frame boundaries
 409  * based on the type of video stream we're receiving.
 410  */
 411 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 412 {
 413         int i, seq_start_code = -1, frame_start_code = -1;
 414
 415         spin_lock(&go->spinlock);
 416
 417         switch (go->format) {
 418         case GO7007_FORMAT_MPEG4:
 419                 seq_start_code = 0xB0;
 420                 frame_start_code = 0xB6;
 421                 break;
 422         case GO7007_FORMAT_MPEG1:
 423         case GO7007_FORMAT_MPEG2:
 424                 seq_start_code = 0xB3;
 425                 frame_start_code = 0x00;
 426                 break;
 427         }
 428
 429         for (i = 0; i < length; ++i) {
 430                 if (go->active_buf != NULL &&
 431                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 432                         printk(KERN_DEBUG "go7007: dropping oversized frame\n");
 433                         go->active_buf->offset -= go->active_buf->bytesused;
 434                         go->active_buf->bytesused = 0;
 435                         go->active_buf->modet_active = 0;
 436                         go->active_buf = NULL;
 437                 }
 438
 439                 switch (go->state) {
 440                 case STATE_DATA:
 441                         switch (buf[i]) {
 442                         case 0x00:
 443                                 go->state = STATE_00;
 444                                 break;
 445                         case 0xFF:
 446                                 go->state = STATE_FF;
 447                                 break;
 448                         default:
 449                                 store_byte(go->active_buf, buf[i]);
 450                                 break;
 451                         }
 452                         break;
 453                 case STATE_00:
 454                         switch (buf[i]) {
 455                         case 0x00:
 456                                 go->state = STATE_00_00;
 457                                 break;
 458                         case 0xFF:
 459                                 store_byte(go->active_buf, 0x00);
 460                                 go->state = STATE_FF;
 461                                 break;
 462                         default:
 463                                 store_byte(go->active_buf, 0x00);
 464                                 store_byte(go->active_buf, buf[i]);
 465                                 go->state = STATE_DATA;
 466                                 break;
 467                         }
 468                         break;
 469                 case STATE_00_00:
 470                         switch (buf[i]) {
 471                         case 0x00:
 472                                 store_byte(go->active_buf, 0x00);
 473                                 /* go->state remains STATE_00_00 */
 474                                 break;
 475                         case 0x01:
 476                                 go->state = STATE_00_00_01;
 477                                 break;
 478                         case 0xFF:
 479                                 store_byte(go->active_buf, 0x00);
 480                                 store_byte(go->active_buf, 0x00);
 481                                 go->state = STATE_FF;
 482                                 break;
 483                         default:
 484                                 store_byte(go->active_buf, 0x00);
 485                                 store_byte(go->active_buf, 0x00);
 486                                 store_byte(go->active_buf, buf[i]);
 487                                 go->state = STATE_DATA;
 488                                 break;
 489                         }
 490                         break;
 491                 case STATE_00_00_01:
 492                         /* If this is the start of a new MPEG frame,
 493                          * get a new buffer */
 494                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 495                                         go->format == GO7007_FORMAT_MPEG2 ||
 496                                         go->format == GO7007_FORMAT_MPEG4) &&
 497                                         (buf[i] == seq_start_code ||
 498                                                 buf[i] == 0xB8 || /* GOP code */
 499                                                 buf[i] == frame_start_code)) {
 500                                 if (go->active_buf == NULL || go->seen_frame)
 501                                         frame_boundary(go);
 502                                 if (buf[i] == frame_start_code) {
 503                                         if (go->active_buf != NULL)
 504                                                 go->active_buf->frame_offset =
 505                                                         go->active_buf->offset;
 506                                         go->seen_frame = 1;
 507                                 } else {
 508                                         go->seen_frame = 0;
 509                                 }
 510                         }
 511                         /* Handle any special chunk types, or just write the
 512                          * start code to the (potentially new) buffer */
 513                         switch (buf[i]) {
 514                         case 0xF5: /* timestamp */
 515                                 go->parse_length = 12;
 516                                 go->state = STATE_UNPARSED;
 517                                 break;
 518                         case 0xF6: /* vbi */
 519                                 go->state = STATE_VBI_LEN_A;
 520                                 break;
 521                         case 0xF8: /* MD map */
 522                                 go->parse_length = 0;
 523                                 memset(go->active_map, 0,
 524                                                 sizeof(go->active_map));
 525                                 go->state = STATE_MODET_MAP;
 526                                 break;
 527                         case 0xFF: /* Potential JPEG start code */
 528                                 store_byte(go->active_buf, 0x00);
 529                                 store_byte(go->active_buf, 0x00);
 530                                 store_byte(go->active_buf, 0x01);
 531                                 go->state = STATE_FF;
 532                                 break;
 533                         default:
 534                                 store_byte(go->active_buf, 0x00);
 535                                 store_byte(go->active_buf, 0x00);
 536                                 store_byte(go->active_buf, 0x01);
 537                                 store_byte(go->active_buf, buf[i]);
 538                                 go->state = STATE_DATA;
 539                                 break;
 540                         }
 541                         break;
 542                 case STATE_FF:
 543                         switch (buf[i]) {
 544                         case 0x00:
 545                                 store_byte(go->active_buf, 0xFF);
 546                                 go->state = STATE_00;
 547                                 break;
 548                         case 0xFF:
 549                                 store_byte(go->active_buf, 0xFF);
 550                                 /* go->state remains STATE_FF */
 551                                 break;
 552                         case 0xD8:
 553                                 if (go->format == GO7007_FORMAT_MJPEG)
 554                                         frame_boundary(go);
 555                                 /* fall through */
 556                         default:
 557                                 store_byte(go->active_buf, 0xFF);
 558                                 store_byte(go->active_buf, buf[i]);
 559                                 go->state = STATE_DATA;
 560                                 break;
 561                         }
 562                         break;
 563                 case STATE_VBI_LEN_A:
 564                         go->parse_length = buf[i] << 8;
 565                         go->state = STATE_VBI_LEN_B;
 566                         break;
 567                 case STATE_VBI_LEN_B:
 568                         go->parse_length |= buf[i];
 569                         if (go->parse_length > 0)
 570                                 go->state = STATE_UNPARSED;
 571                         else
 572                                 go->state = STATE_DATA;
 573                         break;
 574                 case STATE_MODET_MAP:
 575                         if (go->parse_length < 204) {
 576                                 if (go->parse_length & 1) {
 577                                         go->modet_word |= buf[i];
 578                                         write_bitmap_word(go);
 579                                 } else
 580                                         go->modet_word = buf[i] << 8;
 581                         } else if (go->parse_length == 207 && go->active_buf) {
 582                                 go->active_buf->modet_active = buf[i];
 583                         }
 584                         if (++go->parse_length == 208)
 585                                 go->state = STATE_DATA;
 586                         break;
 587                 case STATE_UNPARSED:
 588                         if (--go->parse_length == 0)
 589                                 go->state = STATE_DATA;
 590                         break;
 591                 }
 592         }
 593
 594         spin_unlock(&go->spinlock);
 595 }
 596 EXPORT_SYMBOL(go7007_parse_video_stream);
 597
 598 /*
 599  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 600  */
 601 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 602 {
 603         struct go7007 *go;
 604         int i;
 605
 606         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 607         if (go == NULL)
 608                 return NULL;
 609         go->dev = dev;
 610         go->board_info = board;
 611         go->board_id = 0;
 612         go->tuner_type = -1;
 613         go->channel_number = 0;
 614         go->name[0] = 0;
 615         init_MUTEX(&go->hw_lock);
 616         init_waitqueue_head(&go->frame_waitq);
 617         spin_lock_init(&go->spinlock);
 618         go->video_dev = NULL;
 619         go->ref_count = 0;
 620         go->status = STATUS_INIT;
 621         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 622         go->i2c_adapter_online = 0;
 623         go->interrupt_available = 0;
 624         init_waitqueue_head(&go->interrupt_waitq);
 625         go->in_use = 0;
 626         go->input = 0;
 627         if (board->sensor_flags & GO7007_SENSOR_TV) {
 628                 go->standard = GO7007_STD_NTSC;
 629                 go->width = 720;
 630                 go->height = 480;
 631                 go->sensor_framerate = 30000;
 632         } else {
 633                 go->standard = GO7007_STD_OTHER;
 634                 go->width = board->sensor_width;
 635                 go->height = board->sensor_height;
 636                 go->sensor_framerate = board->sensor_framerate;
 637         }
 638         go->encoder_v_offset = board->sensor_v_offset;
 639         go->encoder_h_offset = board->sensor_h_offset;
 640         go->encoder_h_halve = 0;
 641         go->encoder_v_halve = 0;
 642         go->encoder_subsample = 0;
 643         go->streaming = 0;
 644         go->format = GO7007_FORMAT_MJPEG;
 645         go->bitrate = 1500000;
 646         go->fps_scale = 1;
 647         go->pali = 0;
 648         go->aspect_ratio = GO7007_RATIO_1_1;
 649         go->gop_size = 0;
 650         go->ipb = 0;
 651         go->closed_gop = 0;
 652         go->repeat_seqhead = 0;
 653         go->seq_header_enable = 0;
 654         go->gop_header_enable = 0;
 655         go->dvd_mode = 0;
 656         go->interlace_coding = 0;
 657         for (i = 0; i < 4; ++i)
 658                 go->modet[i].enable = 0;;
 659         for (i = 0; i < 1624; ++i)
 660                 go->modet_map[i] = 0;
 661         go->audio_deliver = NULL;
 662         go->audio_enabled = 0;
 663         INIT_LIST_HEAD(&go->stream);
 664
 665         return go;
 666 }
 667 EXPORT_SYMBOL(go7007_alloc);
 668
 669 /*
 670  * Detach and unregister the encoder.  The go7007 struct won't be freed
 671  * until v4l2 finishes releasing its resources and all associated fds are
 672  * closed by applications.
 673  */
 674 void go7007_remove(struct go7007 *go)
 675 {
 676         if (go->i2c_adapter_online) {
 677                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 678                         go->i2c_adapter_online = 0;
 679                 else
 680                         printk(KERN_ERR
 681                                 "go7007: error removing I2C adapter!\n");
 682         }
 683
 684         if (go->audio_enabled)
 685                 go7007_snd_remove(go);
 686         go7007_v4l2_remove(go);
 687 }
 688 EXPORT_SYMBOL(go7007_remove);
 689
 690 MODULE_LICENSE("GPL v2");