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 addr)
 198 {
 199         struct go7007 *go = i2c_get_adapdata(adapter);
 200         struct v4l2_device *v4l2_dev = &go->v4l2_dev;
 201
 202         if (v4l2_i2c_new_subdev(v4l2_dev, adapter, NULL, type, addr, NULL))
 203                 return 0;
 204
 205         printk(KERN_INFO "go7007: probing for module i2c:%s failed\n", type);
 206         return -1;
 207 }
 208
 209 /*
 210  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 211  * (if used on this board), load the I2C client driver for the sensor
 212  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 213  * interfaces.
 214  *
 215  * Must NOT be called with the hw_lock held.
 216  */
 217 int go7007_register_encoder(struct go7007 *go)
 218 {
 219         int i, ret;
 220
 221         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 222
 223         mutex_lock(&go->hw_lock);
 224         ret = go7007_init_encoder(go);
 225         mutex_unlock(&go->hw_lock);
 226         if (ret < 0)
 227                 return -1;
 228
 229         /* v4l2 init must happen before i2c subdevs */
 230         ret = go7007_v4l2_init(go);
 231         if (ret < 0)
 232                 return ret;
 233
 234         if (!go->i2c_adapter_online &&
 235                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 236                 if (go7007_i2c_init(go) < 0)
 237                         return -1;
 238                 go->i2c_adapter_online = 1;
 239         }
 240         if (go->i2c_adapter_online) {
 241                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 242                         init_i2c_module(&go->i2c_adapter,
 243                                         go->board_info->i2c_devs[i].type,
 244                                         go->board_info->i2c_devs[i].addr);
 245                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 246                         i2c_clients_command(&go->i2c_adapter,
 247                                 DECODER_SET_CHANNEL, &go->channel_number);
 248         }
 249         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 250                 go->audio_enabled = 1;
 251                 go7007_snd_init(go);
 252         }
 253         return 0;
 254 }
 255 EXPORT_SYMBOL(go7007_register_encoder);
 256
 257 /*
 258  * Send the encode firmware to the encoder, which will cause it
 259  * to immediately start delivering the video and audio streams.
 260  *
 261  * Must be called with the hw_lock held.
 262  */
 263 int go7007_start_encoder(struct go7007 *go)
 264 {
 265         u8 *fw;
 266         int fw_len, rv = 0, i;
 267         u16 intr_val, intr_data;
 268
 269         go->modet_enable = 0;
 270         if (!go->dvd_mode)
 271                 for (i = 0; i < 4; ++i) {
 272                         if (go->modet[i].enable) {
 273                                 go->modet_enable = 1;
 274                                 continue;
 275                         }
 276                         go->modet[i].pixel_threshold = 32767;
 277                         go->modet[i].motion_threshold = 32767;
 278                         go->modet[i].mb_threshold = 32767;
 279                 }
 280
 281         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 282                 return -1;
 283
 284         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 285                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 286                 v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
 287                 rv = -1;
 288                 goto start_error;
 289         }
 290
 291         go->state = STATE_DATA;
 292         go->parse_length = 0;
 293         go->seen_frame = 0;
 294         if (go7007_stream_start(go) < 0) {
 295                 v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
 296                 rv = -1;
 297                 goto start_error;
 298         }
 299
 300 start_error:
 301         kfree(fw);
 302         return rv;
 303 }
 304
 305 /*
 306  * Store a byte in the current video buffer, if there is one.
 307  */
 308 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 309 {
 310         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 311                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 312                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 313
 314                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 315                 ++gobuf->offset;
 316                 ++gobuf->bytesused;
 317         }
 318 }
 319
 320 /*
 321  * Deliver the last video buffer and get a new one to start writing to.
 322  */
 323 static void frame_boundary(struct go7007 *go)
 324 {
 325         struct go7007_buffer *gobuf;
 326         int i;
 327
 328         if (go->active_buf) {
 329                 if (go->active_buf->modet_active) {
 330                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 331                                 for (i = 0; i < 216; ++i)
 332                                         store_byte(go->active_buf,
 333                                                         go->active_map[i]);
 334                                 go->active_buf->bytesused -= 216;
 335                         } else
 336                                 go->active_buf->modet_active = 0;
 337                 }
 338                 go->active_buf->state = BUF_STATE_DONE;
 339                 wake_up_interruptible(&go->frame_waitq);
 340                 go->active_buf = NULL;
 341         }
 342         list_for_each_entry(gobuf, &go->stream, stream)
 343                 if (gobuf->state == BUF_STATE_QUEUED) {
 344                         gobuf->seq = go->next_seq;
 345                         do_gettimeofday(&gobuf->timestamp);
 346                         go->active_buf = gobuf;
 347                         break;
 348                 }
 349         ++go->next_seq;
 350 }
 351
 352 static void write_bitmap_word(struct go7007 *go)
 353 {
 354         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 355
 356         for (i = 0; i < 16; ++i) {
 357                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 358                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 359                 if (stride * y + (x >> 3) < sizeof(go->active_map))
 360                         go->active_map[stride * y + (x >> 3)] |=
 361                                         (go->modet_word & 1) << (x & 0x7);
 362                 go->modet_word >>= 1;
 363         }
 364 }
 365
 366 /*
 367  * Parse a chunk of the video stream into frames.  The frames are not
 368  * delimited by the hardware, so we have to parse the frame boundaries
 369  * based on the type of video stream we're receiving.
 370  */
 371 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 372 {
 373         int i, seq_start_code = -1, frame_start_code = -1;
 374
 375         spin_lock(&go->spinlock);
 376
 377         switch (go->format) {
 378         case GO7007_FORMAT_MPEG4:
 379                 seq_start_code = 0xB0;
 380                 frame_start_code = 0xB6;
 381                 break;
 382         case GO7007_FORMAT_MPEG1:
 383         case GO7007_FORMAT_MPEG2:
 384                 seq_start_code = 0xB3;
 385                 frame_start_code = 0x00;
 386                 break;
 387         }
 388
 389         for (i = 0; i < length; ++i) {
 390                 if (go->active_buf != NULL &&
 391                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 392                         v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
 393                         go->active_buf->offset -= go->active_buf->bytesused;
 394                         go->active_buf->bytesused = 0;
 395                         go->active_buf->modet_active = 0;
 396                         go->active_buf = NULL;
 397                 }
 398
 399                 switch (go->state) {
 400                 case STATE_DATA:
 401                         switch (buf[i]) {
 402                         case 0x00:
 403                                 go->state = STATE_00;
 404                                 break;
 405                         case 0xFF:
 406                                 go->state = STATE_FF;
 407                                 break;
 408                         default:
 409                                 store_byte(go->active_buf, buf[i]);
 410                                 break;
 411                         }
 412                         break;
 413                 case STATE_00:
 414                         switch (buf[i]) {
 415                         case 0x00:
 416                                 go->state = STATE_00_00;
 417                                 break;
 418                         case 0xFF:
 419                                 store_byte(go->active_buf, 0x00);
 420                                 go->state = STATE_FF;
 421                                 break;
 422                         default:
 423                                 store_byte(go->active_buf, 0x00);
 424                                 store_byte(go->active_buf, buf[i]);
 425                                 go->state = STATE_DATA;
 426                                 break;
 427                         }
 428                         break;
 429                 case STATE_00_00:
 430                         switch (buf[i]) {
 431                         case 0x00:
 432                                 store_byte(go->active_buf, 0x00);
 433                                 /* go->state remains STATE_00_00 */
 434                                 break;
 435                         case 0x01:
 436                                 go->state = STATE_00_00_01;
 437                                 break;
 438                         case 0xFF:
 439                                 store_byte(go->active_buf, 0x00);
 440                                 store_byte(go->active_buf, 0x00);
 441                                 go->state = STATE_FF;
 442                                 break;
 443                         default:
 444                                 store_byte(go->active_buf, 0x00);
 445                                 store_byte(go->active_buf, 0x00);
 446                                 store_byte(go->active_buf, buf[i]);
 447                                 go->state = STATE_DATA;
 448                                 break;
 449                         }
 450                         break;
 451                 case STATE_00_00_01:
 452                         if (buf[i] == 0xF8 && go->modet_enable == 0) {
 453                                 /* MODET start code, but MODET not enabled */
 454                                 store_byte(go->active_buf, 0x00);
 455                                 store_byte(go->active_buf, 0x00);
 456                                 store_byte(go->active_buf, 0x01);
 457                                 store_byte(go->active_buf, 0xF8);
 458                                 go->state = STATE_DATA;
 459                                 break;
 460                         }
 461                         /* If this is the start of a new MPEG frame,
 462                          * get a new buffer */
 463                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 464                                         go->format == GO7007_FORMAT_MPEG2 ||
 465                                         go->format == GO7007_FORMAT_MPEG4) &&
 466                                         (buf[i] == seq_start_code ||
 467                                                 buf[i] == 0xB8 || /* GOP code */
 468                                                 buf[i] == frame_start_code)) {
 469                                 if (go->active_buf == NULL || go->seen_frame)
 470                                         frame_boundary(go);
 471                                 if (buf[i] == frame_start_code) {
 472                                         if (go->active_buf != NULL)
 473                                                 go->active_buf->frame_offset =
 474                                                         go->active_buf->offset;
 475                                         go->seen_frame = 1;
 476                                 } else {
 477                                         go->seen_frame = 0;
 478                                 }
 479                         }
 480                         /* Handle any special chunk types, or just write the
 481                          * start code to the (potentially new) buffer */
 482                         switch (buf[i]) {
 483                         case 0xF5: /* timestamp */
 484                                 go->parse_length = 12;
 485                                 go->state = STATE_UNPARSED;
 486                                 break;
 487                         case 0xF6: /* vbi */
 488                                 go->state = STATE_VBI_LEN_A;
 489                                 break;
 490                         case 0xF8: /* MD map */
 491                                 go->parse_length = 0;
 492                                 memset(go->active_map, 0,
 493                                                 sizeof(go->active_map));
 494                                 go->state = STATE_MODET_MAP;
 495                                 break;
 496                         case 0xFF: /* Potential JPEG start code */
 497                                 store_byte(go->active_buf, 0x00);
 498                                 store_byte(go->active_buf, 0x00);
 499                                 store_byte(go->active_buf, 0x01);
 500                                 go->state = STATE_FF;
 501                                 break;
 502                         default:
 503                                 store_byte(go->active_buf, 0x00);
 504                                 store_byte(go->active_buf, 0x00);
 505                                 store_byte(go->active_buf, 0x01);
 506                                 store_byte(go->active_buf, buf[i]);
 507                                 go->state = STATE_DATA;
 508                                 break;
 509                         }
 510                         break;
 511                 case STATE_FF:
 512                         switch (buf[i]) {
 513                         case 0x00:
 514                                 store_byte(go->active_buf, 0xFF);
 515                                 go->state = STATE_00;
 516                                 break;
 517                         case 0xFF:
 518                                 store_byte(go->active_buf, 0xFF);
 519                                 /* go->state remains STATE_FF */
 520                                 break;
 521                         case 0xD8:
 522                                 if (go->format == GO7007_FORMAT_MJPEG)
 523                                         frame_boundary(go);
 524                                 /* fall through */
 525                         default:
 526                                 store_byte(go->active_buf, 0xFF);
 527                                 store_byte(go->active_buf, buf[i]);
 528                                 go->state = STATE_DATA;
 529                                 break;
 530                         }
 531                         break;
 532                 case STATE_VBI_LEN_A:
 533                         go->parse_length = buf[i] << 8;
 534                         go->state = STATE_VBI_LEN_B;
 535                         break;
 536                 case STATE_VBI_LEN_B:
 537                         go->parse_length |= buf[i];
 538                         if (go->parse_length > 0)
 539                                 go->state = STATE_UNPARSED;
 540                         else
 541                                 go->state = STATE_DATA;
 542                         break;
 543                 case STATE_MODET_MAP:
 544                         if (go->parse_length < 204) {
 545                                 if (go->parse_length & 1) {
 546                                         go->modet_word |= buf[i];
 547                                         write_bitmap_word(go);
 548                                 } else
 549                                         go->modet_word = buf[i] << 8;
 550                         } else if (go->parse_length == 207 && go->active_buf) {
 551                                 go->active_buf->modet_active = buf[i];
 552                         }
 553                         if (++go->parse_length == 208)
 554                                 go->state = STATE_DATA;
 555                         break;
 556                 case STATE_UNPARSED:
 557                         if (--go->parse_length == 0)
 558                                 go->state = STATE_DATA;
 559                         break;
 560                 }
 561         }
 562
 563         spin_unlock(&go->spinlock);
 564 }
 565 EXPORT_SYMBOL(go7007_parse_video_stream);
 566
 567 /*
 568  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 569  */
 570 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 571 {
 572         struct go7007 *go;
 573         int i;
 574
 575         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 576         if (go == NULL)
 577                 return NULL;
 578         go->dev = dev;
 579         go->board_info = board;
 580         go->board_id = 0;
 581         go->tuner_type = -1;
 582         go->channel_number = 0;
 583         go->name[0] = 0;
 584         mutex_init(&go->hw_lock);
 585         init_waitqueue_head(&go->frame_waitq);
 586         spin_lock_init(&go->spinlock);
 587         go->video_dev = NULL;
 588         go->ref_count = 0;
 589         go->status = STATUS_INIT;
 590         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 591         go->i2c_adapter_online = 0;
 592         go->interrupt_available = 0;
 593         init_waitqueue_head(&go->interrupt_waitq);
 594         go->in_use = 0;
 595         go->input = 0;
 596         if (board->sensor_flags & GO7007_SENSOR_TV) {
 597                 go->standard = GO7007_STD_NTSC;
 598                 go->width = 720;
 599                 go->height = 480;
 600                 go->sensor_framerate = 30000;
 601         } else {
 602                 go->standard = GO7007_STD_OTHER;
 603                 go->width = board->sensor_width;
 604                 go->height = board->sensor_height;
 605                 go->sensor_framerate = board->sensor_framerate;
 606         }
 607         go->encoder_v_offset = board->sensor_v_offset;
 608         go->encoder_h_offset = board->sensor_h_offset;
 609         go->encoder_h_halve = 0;
 610         go->encoder_v_halve = 0;
 611         go->encoder_subsample = 0;
 612         go->streaming = 0;
 613         go->format = GO7007_FORMAT_MJPEG;
 614         go->bitrate = 1500000;
 615         go->fps_scale = 1;
 616         go->pali = 0;
 617         go->aspect_ratio = GO7007_RATIO_1_1;
 618         go->gop_size = 0;
 619         go->ipb = 0;
 620         go->closed_gop = 0;
 621         go->repeat_seqhead = 0;
 622         go->seq_header_enable = 0;
 623         go->gop_header_enable = 0;
 624         go->dvd_mode = 0;
 625         go->interlace_coding = 0;
 626         for (i = 0; i < 4; ++i)
 627                 go->modet[i].enable = 0;;
 628         for (i = 0; i < 1624; ++i)
 629                 go->modet_map[i] = 0;
 630         go->audio_deliver = NULL;
 631         go->audio_enabled = 0;
 632         INIT_LIST_HEAD(&go->stream);
 633
 634         return go;
 635 }
 636 EXPORT_SYMBOL(go7007_alloc);
 637
 638 /*
 639  * Detach and unregister the encoder.  The go7007 struct won't be freed
 640  * until v4l2 finishes releasing its resources and all associated fds are
 641  * closed by applications.
 642  */
 643 void go7007_remove(struct go7007 *go)
 644 {
 645         if (go->i2c_adapter_online) {
 646                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 647                         go->i2c_adapter_online = 0;
 648                 else
 649                         v4l2_err(&go->v4l2_dev,
 650                                 "error removing I2C adapter!\n");
 651         }
 652
 653         if (go->audio_enabled)
 654                 go7007_snd_remove(go);
 655         go7007_v4l2_remove(go);
 656 }
 657 EXPORT_SYMBOL(go7007_remove);
 658
 659 MODULE_LICENSE("GPL v2");