Pileus Git - ~andy/linux/blob - drivers/staging/media/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 <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                 v4l2_err(&go->v4l2_dev, "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                 v4l2_err(go, "unable to load firmware from file "
 101                         "\"%s\"\n", fw_name);
 102                 return -1;
 103         }
 104         if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
 105                 v4l2_err(go, "file \"%s\" does not appear to be "
 106                                 "go7007 firmware\n", fw_name);
 107                 release_firmware(fw_entry);
 108                 return -1;
 109         }
 110         fw_len = fw_entry->size - 16;
 111         bounce = kmalloc(fw_len, GFP_KERNEL);
 112         if (bounce == NULL) {
 113                 v4l2_err(go, "unable to allocate %d bytes for "
 114                                 "firmware transfer\n", fw_len);
 115                 release_firmware(fw_entry);
 116                 return -1;
 117         }
 118         memcpy(bounce, fw_entry->data + 16, fw_len);
 119         release_firmware(fw_entry);
 120         if (go7007_interface_reset(go) < 0 ||
 121                         go7007_send_firmware(go, bounce, fw_len) < 0 ||
 122                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0 ||
 123                         (intr_val & ~0x1) != 0x5a5a) {
 124                 v4l2_err(go, "error transferring firmware\n");
 125                 rv = -1;
 126         }
 127         kfree(bounce);
 128         return rv;
 129 }
 130
 131 MODULE_FIRMWARE("go7007fw.bin");
 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         mutex_lock(&go->hw_lock);
 145         ret = go7007_load_encoder(go);
 146         mutex_unlock(&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, const char *type,
 196                            int addr)
 197 {
 198         struct go7007 *go = i2c_get_adapdata(adapter);
 199         struct v4l2_device *v4l2_dev = &go->v4l2_dev;
 200
 201         if (v4l2_i2c_new_subdev(v4l2_dev, adapter, type, addr, NULL))
 202                 return 0;
 203
 204         printk(KERN_INFO "go7007: probing for module i2c:%s failed\n", type);
 205         return -1;
 206 }
 207
 208 /*
 209  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
 210  * (if used on this board), load the I2C client driver for the sensor
 211  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
 212  * interfaces.
 213  *
 214  * Must NOT be called with the hw_lock held.
 215  */
 216 int go7007_register_encoder(struct go7007 *go)
 217 {
 218         int i, ret;
 219
 220         printk(KERN_INFO "go7007: registering new %s\n", go->name);
 221
 222         mutex_lock(&go->hw_lock);
 223         ret = go7007_init_encoder(go);
 224         mutex_unlock(&go->hw_lock);
 225         if (ret < 0)
 226                 return -1;
 227
 228         /* v4l2 init must happen before i2c subdevs */
 229         ret = go7007_v4l2_init(go);
 230         if (ret < 0)
 231                 return ret;
 232
 233         if (!go->i2c_adapter_online &&
 234                         go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 235                 if (go7007_i2c_init(go) < 0)
 236                         return -1;
 237                 go->i2c_adapter_online = 1;
 238         }
 239         if (go->i2c_adapter_online) {
 240                 for (i = 0; i < go->board_info->num_i2c_devs; ++i)
 241                         init_i2c_module(&go->i2c_adapter,
 242                                         go->board_info->i2c_devs[i].type,
 243                                         go->board_info->i2c_devs[i].addr);
 244                 if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 245                         i2c_clients_command(&go->i2c_adapter,
 246                                 DECODER_SET_CHANNEL, &go->channel_number);
 247         }
 248         if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 249                 go->audio_enabled = 1;
 250                 go7007_snd_init(go);
 251         }
 252         return 0;
 253 }
 254 EXPORT_SYMBOL(go7007_register_encoder);
 255
 256 /*
 257  * Send the encode firmware to the encoder, which will cause it
 258  * to immediately start delivering the video and audio streams.
 259  *
 260  * Must be called with the hw_lock held.
 261  */
 262 int go7007_start_encoder(struct go7007 *go)
 263 {
 264         u8 *fw;
 265         int fw_len, rv = 0, i;
 266         u16 intr_val, intr_data;
 267
 268         go->modet_enable = 0;
 269         if (!go->dvd_mode)
 270                 for (i = 0; i < 4; ++i) {
 271                         if (go->modet[i].enable) {
 272                                 go->modet_enable = 1;
 273                                 continue;
 274                         }
 275                         go->modet[i].pixel_threshold = 32767;
 276                         go->modet[i].motion_threshold = 32767;
 277                         go->modet[i].mb_threshold = 32767;
 278                 }
 279
 280         if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 281                 return -1;
 282
 283         if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 284                         go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 285                 v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
 286                 rv = -1;
 287                 goto start_error;
 288         }
 289
 290         go->state = STATE_DATA;
 291         go->parse_length = 0;
 292         go->seen_frame = 0;
 293         if (go7007_stream_start(go) < 0) {
 294                 v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
 295                 rv = -1;
 296                 goto start_error;
 297         }
 298
 299 start_error:
 300         kfree(fw);
 301         return rv;
 302 }
 303
 304 /*
 305  * Store a byte in the current video buffer, if there is one.
 306  */
 307 static inline void store_byte(struct go7007_buffer *gobuf, u8 byte)
 308 {
 309         if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
 310                 unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
 311                 unsigned int pgoff = gobuf->offset & ~PAGE_MASK;
 312
 313                 *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
 314                 ++gobuf->offset;
 315                 ++gobuf->bytesused;
 316         }
 317 }
 318
 319 /*
 320  * Deliver the last video buffer and get a new one to start writing to.
 321  */
 322 static void frame_boundary(struct go7007 *go)
 323 {
 324         struct go7007_buffer *gobuf;
 325         int i;
 326
 327         if (go->active_buf) {
 328                 if (go->active_buf->modet_active) {
 329                         if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
 330                                 for (i = 0; i < 216; ++i)
 331                                         store_byte(go->active_buf,
 332                                                         go->active_map[i]);
 333                                 go->active_buf->bytesused -= 216;
 334                         } else
 335                                 go->active_buf->modet_active = 0;
 336                 }
 337                 go->active_buf->state = BUF_STATE_DONE;
 338                 wake_up_interruptible(&go->frame_waitq);
 339                 go->active_buf = NULL;
 340         }
 341         list_for_each_entry(gobuf, &go->stream, stream)
 342                 if (gobuf->state == BUF_STATE_QUEUED) {
 343                         gobuf->seq = go->next_seq;
 344                         do_gettimeofday(&gobuf->timestamp);
 345                         go->active_buf = gobuf;
 346                         break;
 347                 }
 348         ++go->next_seq;
 349 }
 350
 351 static void write_bitmap_word(struct go7007 *go)
 352 {
 353         int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
 354
 355         for (i = 0; i < 16; ++i) {
 356                 y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 357                 x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 358                 if (stride * y + (x >> 3) < sizeof(go->active_map))
 359                         go->active_map[stride * y + (x >> 3)] |=
 360                                         (go->modet_word & 1) << (x & 0x7);
 361                 go->modet_word >>= 1;
 362         }
 363 }
 364
 365 /*
 366  * Parse a chunk of the video stream into frames.  The frames are not
 367  * delimited by the hardware, so we have to parse the frame boundaries
 368  * based on the type of video stream we're receiving.
 369  */
 370 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 371 {
 372         int i, seq_start_code = -1, frame_start_code = -1;
 373
 374         spin_lock(&go->spinlock);
 375
 376         switch (go->format) {
 377         case GO7007_FORMAT_MPEG4:
 378                 seq_start_code = 0xB0;
 379                 frame_start_code = 0xB6;
 380                 break;
 381         case GO7007_FORMAT_MPEG1:
 382         case GO7007_FORMAT_MPEG2:
 383                 seq_start_code = 0xB3;
 384                 frame_start_code = 0x00;
 385                 break;
 386         }
 387
 388         for (i = 0; i < length; ++i) {
 389                 if (go->active_buf != NULL &&
 390                             go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
 391                         v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
 392                         go->active_buf->offset -= go->active_buf->bytesused;
 393                         go->active_buf->bytesused = 0;
 394                         go->active_buf->modet_active = 0;
 395                         go->active_buf = NULL;
 396                 }
 397
 398                 switch (go->state) {
 399                 case STATE_DATA:
 400                         switch (buf[i]) {
 401                         case 0x00:
 402                                 go->state = STATE_00;
 403                                 break;
 404                         case 0xFF:
 405                                 go->state = STATE_FF;
 406                                 break;
 407                         default:
 408                                 store_byte(go->active_buf, buf[i]);
 409                                 break;
 410                         }
 411                         break;
 412                 case STATE_00:
 413                         switch (buf[i]) {
 414                         case 0x00:
 415                                 go->state = STATE_00_00;
 416                                 break;
 417                         case 0xFF:
 418                                 store_byte(go->active_buf, 0x00);
 419                                 go->state = STATE_FF;
 420                                 break;
 421                         default:
 422                                 store_byte(go->active_buf, 0x00);
 423                                 store_byte(go->active_buf, buf[i]);
 424                                 go->state = STATE_DATA;
 425                                 break;
 426                         }
 427                         break;
 428                 case STATE_00_00:
 429                         switch (buf[i]) {
 430                         case 0x00:
 431                                 store_byte(go->active_buf, 0x00);
 432                                 /* go->state remains STATE_00_00 */
 433                                 break;
 434                         case 0x01:
 435                                 go->state = STATE_00_00_01;
 436                                 break;
 437                         case 0xFF:
 438                                 store_byte(go->active_buf, 0x00);
 439                                 store_byte(go->active_buf, 0x00);
 440                                 go->state = STATE_FF;
 441                                 break;
 442                         default:
 443                                 store_byte(go->active_buf, 0x00);
 444                                 store_byte(go->active_buf, 0x00);
 445                                 store_byte(go->active_buf, buf[i]);
 446                                 go->state = STATE_DATA;
 447                                 break;
 448                         }
 449                         break;
 450                 case STATE_00_00_01:
 451                         if (buf[i] == 0xF8 && go->modet_enable == 0) {
 452                                 /* MODET start code, but MODET not enabled */
 453                                 store_byte(go->active_buf, 0x00);
 454                                 store_byte(go->active_buf, 0x00);
 455                                 store_byte(go->active_buf, 0x01);
 456                                 store_byte(go->active_buf, 0xF8);
 457                                 go->state = STATE_DATA;
 458                                 break;
 459                         }
 460                         /* If this is the start of a new MPEG frame,
 461                          * get a new buffer */
 462                         if ((go->format == GO7007_FORMAT_MPEG1 ||
 463                                         go->format == GO7007_FORMAT_MPEG2 ||
 464                                         go->format == GO7007_FORMAT_MPEG4) &&
 465                                         (buf[i] == seq_start_code ||
 466                                                 buf[i] == 0xB8 || /* GOP code */
 467                                                 buf[i] == frame_start_code)) {
 468                                 if (go->active_buf == NULL || go->seen_frame)
 469                                         frame_boundary(go);
 470                                 if (buf[i] == frame_start_code) {
 471                                         if (go->active_buf != NULL)
 472                                                 go->active_buf->frame_offset =
 473                                                         go->active_buf->offset;
 474                                         go->seen_frame = 1;
 475                                 } else {
 476                                         go->seen_frame = 0;
 477                                 }
 478                         }
 479                         /* Handle any special chunk types, or just write the
 480                          * start code to the (potentially new) buffer */
 481                         switch (buf[i]) {
 482                         case 0xF5: /* timestamp */
 483                                 go->parse_length = 12;
 484                                 go->state = STATE_UNPARSED;
 485                                 break;
 486                         case 0xF6: /* vbi */
 487                                 go->state = STATE_VBI_LEN_A;
 488                                 break;
 489                         case 0xF8: /* MD map */
 490                                 go->parse_length = 0;
 491                                 memset(go->active_map, 0,
 492                                                 sizeof(go->active_map));
 493                                 go->state = STATE_MODET_MAP;
 494                                 break;
 495                         case 0xFF: /* Potential JPEG start code */
 496                                 store_byte(go->active_buf, 0x00);
 497                                 store_byte(go->active_buf, 0x00);
 498                                 store_byte(go->active_buf, 0x01);
 499                                 go->state = STATE_FF;
 500                                 break;
 501                         default:
 502                                 store_byte(go->active_buf, 0x00);
 503                                 store_byte(go->active_buf, 0x00);
 504                                 store_byte(go->active_buf, 0x01);
 505                                 store_byte(go->active_buf, buf[i]);
 506                                 go->state = STATE_DATA;
 507                                 break;
 508                         }
 509                         break;
 510                 case STATE_FF:
 511                         switch (buf[i]) {
 512                         case 0x00:
 513                                 store_byte(go->active_buf, 0xFF);
 514                                 go->state = STATE_00;
 515                                 break;
 516                         case 0xFF:
 517                                 store_byte(go->active_buf, 0xFF);
 518                                 /* go->state remains STATE_FF */
 519                                 break;
 520                         case 0xD8:
 521                                 if (go->format == GO7007_FORMAT_MJPEG)
 522                                         frame_boundary(go);
 523                                 /* fall through */
 524                         default:
 525                                 store_byte(go->active_buf, 0xFF);
 526                                 store_byte(go->active_buf, buf[i]);
 527                                 go->state = STATE_DATA;
 528                                 break;
 529                         }
 530                         break;
 531                 case STATE_VBI_LEN_A:
 532                         go->parse_length = buf[i] << 8;
 533                         go->state = STATE_VBI_LEN_B;
 534                         break;
 535                 case STATE_VBI_LEN_B:
 536                         go->parse_length |= buf[i];
 537                         if (go->parse_length > 0)
 538                                 go->state = STATE_UNPARSED;
 539                         else
 540                                 go->state = STATE_DATA;
 541                         break;
 542                 case STATE_MODET_MAP:
 543                         if (go->parse_length < 204) {
 544                                 if (go->parse_length & 1) {
 545                                         go->modet_word |= buf[i];
 546                                         write_bitmap_word(go);
 547                                 } else
 548                                         go->modet_word = buf[i] << 8;
 549                         } else if (go->parse_length == 207 && go->active_buf) {
 550                                 go->active_buf->modet_active = buf[i];
 551                         }
 552                         if (++go->parse_length == 208)
 553                                 go->state = STATE_DATA;
 554                         break;
 555                 case STATE_UNPARSED:
 556                         if (--go->parse_length == 0)
 557                                 go->state = STATE_DATA;
 558                         break;
 559                 }
 560         }
 561
 562         spin_unlock(&go->spinlock);
 563 }
 564 EXPORT_SYMBOL(go7007_parse_video_stream);
 565
 566 /*
 567  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
 568  */
 569 struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 570 {
 571         struct go7007 *go;
 572         int i;
 573
 574         go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
 575         if (go == NULL)
 576                 return NULL;
 577         go->dev = dev;
 578         go->board_info = board;
 579         go->board_id = 0;
 580         go->tuner_type = -1;
 581         go->channel_number = 0;
 582         go->name[0] = 0;
 583         mutex_init(&go->hw_lock);
 584         init_waitqueue_head(&go->frame_waitq);
 585         spin_lock_init(&go->spinlock);
 586         go->video_dev = NULL;
 587         go->ref_count = 0;
 588         go->status = STATUS_INIT;
 589         memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 590         go->i2c_adapter_online = 0;
 591         go->interrupt_available = 0;
 592         init_waitqueue_head(&go->interrupt_waitq);
 593         go->in_use = 0;
 594         go->input = 0;
 595         if (board->sensor_flags & GO7007_SENSOR_TV) {
 596                 go->standard = GO7007_STD_NTSC;
 597                 go->width = 720;
 598                 go->height = 480;
 599                 go->sensor_framerate = 30000;
 600         } else {
 601                 go->standard = GO7007_STD_OTHER;
 602                 go->width = board->sensor_width;
 603                 go->height = board->sensor_height;
 604                 go->sensor_framerate = board->sensor_framerate;
 605         }
 606         go->encoder_v_offset = board->sensor_v_offset;
 607         go->encoder_h_offset = board->sensor_h_offset;
 608         go->encoder_h_halve = 0;
 609         go->encoder_v_halve = 0;
 610         go->encoder_subsample = 0;
 611         go->streaming = 0;
 612         go->format = GO7007_FORMAT_MJPEG;
 613         go->bitrate = 1500000;
 614         go->fps_scale = 1;
 615         go->pali = 0;
 616         go->aspect_ratio = GO7007_RATIO_1_1;
 617         go->gop_size = 0;
 618         go->ipb = 0;
 619         go->closed_gop = 0;
 620         go->repeat_seqhead = 0;
 621         go->seq_header_enable = 0;
 622         go->gop_header_enable = 0;
 623         go->dvd_mode = 0;
 624         go->interlace_coding = 0;
 625         for (i = 0; i < 4; ++i)
 626                 go->modet[i].enable = 0;
 627         for (i = 0; i < 1624; ++i)
 628                 go->modet_map[i] = 0;
 629         go->audio_deliver = NULL;
 630         go->audio_enabled = 0;
 631         INIT_LIST_HEAD(&go->stream);
 632
 633         return go;
 634 }
 635 EXPORT_SYMBOL(go7007_alloc);
 636
 637 /*
 638  * Detach and unregister the encoder.  The go7007 struct won't be freed
 639  * until v4l2 finishes releasing its resources and all associated fds are
 640  * closed by applications.
 641  */
 642 void go7007_remove(struct go7007 *go)
 643 {
 644         if (go->i2c_adapter_online) {
 645                 if (i2c_del_adapter(&go->i2c_adapter) == 0)
 646                         go->i2c_adapter_online = 0;
 647                 else
 648                         v4l2_err(&go->v4l2_dev,
 649                                 "error removing I2C adapter!\n");
 650         }
 651
 652         if (go->audio_enabled)
 653                 go7007_snd_remove(go);
 654         go7007_v4l2_remove(go);
 655 }
 656 EXPORT_SYMBOL(go7007_remove);
 657
 658 MODULE_LICENSE("GPL v2");