drivers/staging/easycap/easycap_sound_oss.c

   1 /******************************************************************************
   2 *                                                                             *
   3 *  easycap_sound.c                                                            *
   4 *                                                                             *
   5 *  Audio driver for EasyCAP USB2.0 Video Capture Device DC60                  *
   6 *                                                                             *
   7 *                                                                             *
   8 ******************************************************************************/
   9 /*
  10  *
  11  *  Copyright (C) 2010 R.M. Thomas  <rmthomas@sciolus.org>
  12  *
  13  *
  14  *  This is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License as published by
  16  *  the Free Software Foundation; either version 2 of the License, or
  17  *  (at your option) any later version.
  18  *
  19  *  The software is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this software; if not, write to the Free Software
  26  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  *
  28 */
  29 /*****************************************************************************/
  30
  31 #include "easycap.h"
  32
  33 /*****************************************************************************/
  34 /****************************                       **************************/
  35 /****************************   Open Sound System   **************************/
  36 /****************************                       **************************/
  37 /*****************************************************************************/
  38 /*--------------------------------------------------------------------------*/
  39 /*
  40  *  PARAMETERS USED WHEN REGISTERING THE AUDIO INTERFACE
  41  */
  42 /*--------------------------------------------------------------------------*/
  43 /*****************************************************************************/
  44 /*---------------------------------------------------------------------------*/
  45 /*
  46  *  ON COMPLETION OF AN AUDIO URB ITS DATA IS COPIED TO THE AUDIO BUFFERS
  47  *  PROVIDED peasycap->audio_idle IS ZERO.  REGARDLESS OF THIS BEING TRUE,
  48  *  IT IS RESUBMITTED PROVIDED peasycap->audio_isoc_streaming IS NOT ZERO.
  49  */
  50 /*---------------------------------------------------------------------------*/
  51 void
  52 easyoss_complete(struct urb *purb)
  53 {
  54         struct easycap *peasycap;
  55         struct data_buffer *paudio_buffer;
  56         u8 *p1, *p2;
  57         s16 tmp;
  58         int i, j, more, much, leap, rc;
  59 #ifdef UPSAMPLE
  60         int k;
  61         s16 oldaudio, newaudio, delta;
  62 #endif /*UPSAMPLE*/
  63
  64         JOT(16, "\n");
  65
  66         if (!purb) {
  67                 SAY("ERROR: purb is NULL\n");
  68                 return;
  69         }
  70         peasycap = purb->context;
  71         if (!peasycap) {
  72                 SAY("ERROR: peasycap is NULL\n");
  73                 return;
  74         }
  75         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
  76                 SAY("ERROR: bad peasycap\n");
  77                 return;
  78         }
  79         much = 0;
  80         if (peasycap->audio_idle) {
  81                 JOM(16, "%i=audio_idle  %i=audio_isoc_streaming\n",
  82                     peasycap->audio_idle, peasycap->audio_isoc_streaming);
  83                 if (peasycap->audio_isoc_streaming) {
  84                         rc = usb_submit_urb(purb, GFP_ATOMIC);
  85                         if (rc) {
  86                                 if (-ENODEV != rc && -ENOENT != rc) {
  87                                         SAM("ERROR: while %i=audio_idle, "
  88                                             "usb_submit_urb() failed with rc: -%s: %d\n",
  89                                             peasycap->audio_idle,
  90                                             strerror(rc), rc);
  91                                 }
  92                         }
  93                 }
  94                 return;
  95         }
  96 /*---------------------------------------------------------------------------*/
  97         if (purb->status) {
  98                 if ((-ESHUTDOWN == purb->status) || (-ENOENT == purb->status)) {
  99                         JOM(16, "urb status -ESHUTDOWN or -ENOENT\n");
 100                         return;
 101                 }
 102                 SAM("ERROR: non-zero urb status: -%s: %d\n",
 103                     strerror(purb->status), purb->status);
 104                 goto resubmit;
 105         }
 106 /*---------------------------------------------------------------------------*/
 107 /*
 108  *  PROCEED HERE WHEN NO ERROR
 109  */
 110 /*---------------------------------------------------------------------------*/
 111 #ifdef UPSAMPLE
 112         oldaudio = peasycap->oldaudio;
 113 #endif /*UPSAMPLE*/
 114
 115         for (i = 0;  i < purb->number_of_packets; i++) {
 116                 if (!purb->iso_frame_desc[i].status) {
 117
 118                         SAM("-%s\n", strerror(purb->iso_frame_desc[i].status));
 119
 120                         more = purb->iso_frame_desc[i].actual_length;
 121
 122                         if (!more)
 123                                 peasycap->audio_mt++;
 124                         else {
 125                                 if (peasycap->audio_mt) {
 126                                         JOM(12, "%4i empty audio urb frames\n",
 127                                             peasycap->audio_mt);
 128                                         peasycap->audio_mt = 0;
 129                                 }
 130
 131                                 p1 = (u8 *)(purb->transfer_buffer + purb->iso_frame_desc[i].offset);
 132
 133                                 leap = 0;
 134                                 p1 += leap;
 135                                 more -= leap;
 136                                 /*
 137                                  *  COPY more BYTES FROM ISOC BUFFER
 138                                  *  TO AUDIO BUFFER, CONVERTING
 139                                  *  8-BIT MONO TO 16-BIT SIGNED
 140                                  *  LITTLE-ENDIAN SAMPLES IF NECESSARY
 141                                  */
 142                                 while (more) {
 143                                         if (0 > more) {
 144                                                 SAM("MISTAKE: more is negative\n");
 145                                                 return;
 146                                         }
 147                                         if (peasycap->audio_buffer_page_many <= peasycap->audio_fill) {
 148                                                 SAM("ERROR: bad peasycap->audio_fill\n");
 149                                                 return;
 150                                         }
 151
 152                                         paudio_buffer = &peasycap->audio_buffer[peasycap->audio_fill];
 153                                         if (PAGE_SIZE < (paudio_buffer->pto - paudio_buffer->pgo)) {
 154                                                 SAM("ERROR: bad paudio_buffer->pto\n");
 155                                                 return;
 156                                         }
 157                                         if (PAGE_SIZE == (paudio_buffer->pto - paudio_buffer->pgo)) {
 158
 159                                                 paudio_buffer->pto = paudio_buffer->pgo;
 160                                                 (peasycap->audio_fill)++;
 161                                                 if (peasycap->audio_buffer_page_many <= peasycap->audio_fill)
 162                                                         peasycap->audio_fill = 0;
 163
 164                                                 JOM(8, "bumped peasycap->"
 165                                                     "audio_fill to %i\n",
 166                                                     peasycap->audio_fill);
 167
 168                                                 paudio_buffer = &peasycap->audio_buffer[peasycap->audio_fill];
 169                                                 paudio_buffer->pto = paudio_buffer->pgo;
 170
 171                                                 if (!(peasycap->audio_fill % peasycap->audio_pages_per_fragment)) {
 172                                                         JOM(12, "wakeup call on wq_audio, %i=frag reading  %i=fragment fill\n",
 173                                                             (peasycap->audio_read / peasycap->audio_pages_per_fragment),
 174                                                             (peasycap->audio_fill / peasycap->audio_pages_per_fragment));
 175                                                         wake_up_interruptible(&(peasycap->wq_audio));
 176                                                 }
 177                                         }
 178
 179                                         much = PAGE_SIZE - (int)(paudio_buffer->pto - paudio_buffer->pgo);
 180
 181                                         if (!peasycap->microphone) {
 182                                                 if (much > more)
 183                                                         much = more;
 184
 185                                                 memcpy(paudio_buffer->pto, p1, much);
 186                                                 p1 += much;
 187                                                 more -= much;
 188                                         } else {
 189 #ifdef UPSAMPLE
 190                                                 if (much % 16)
 191                                                         JOM(8, "MISTAKE? much"
 192                                                             " is not divisible by 16\n");
 193                                                 if (much > (16 * more))
 194                                                         much = 16 * more;
 195                                                 p2 = (u8 *)paudio_buffer->pto;
 196
 197                                                 for (j = 0;  j < (much/16);  j++) {
 198                                                         newaudio =  ((int) *p1) - 128;
 199                                                         newaudio = 128 * newaudio;
 200
 201                                                         delta = (newaudio - oldaudio) / 4;
 202                                                         tmp = oldaudio + delta;
 203
 204                                                         for (k = 0;  k < 4;  k++) {
 205                                                                 *p2 = (0x00FF & tmp);
 206                                                                 *(p2 + 1) = (0xFF00 & tmp) >> 8;
 207                                                                 p2 += 2;
 208                                                                 *p2 = (0x00FF & tmp);
 209                                                                 *(p2 + 1) = (0xFF00 & tmp) >> 8;
 210                                                                 p2 += 2;
 211
 212                                                                 tmp += delta;
 213                                                         }
 214                                                         p1++;
 215                                                         more--;
 216                                                         oldaudio = tmp;
 217                                                 }
 218 #else /*!UPSAMPLE*/
 219                                                 if (much > (2 * more))
 220                                                         much = 2 * more;
 221                                                 p2 = (u8 *)paudio_buffer->pto;
 222
 223                                                 for (j = 0;  j < (much / 2);  j++) {
 224                                                         tmp =  ((int) *p1) - 128;
 225                                                         tmp = 128 * tmp;
 226                                                         *p2 = (0x00FF & tmp);
 227                                                         *(p2 + 1) = (0xFF00 & tmp) >> 8;
 228                                                         p1++;
 229                                                         p2 += 2;
 230                                                         more--;
 231                                                 }
 232 #endif /*UPSAMPLE*/
 233                                         }
 234                                         (paudio_buffer->pto) += much;
 235                                 }
 236                         }
 237                 } else {
 238                         JOM(12, "discarding audio samples because "
 239                             "%i=purb->iso_frame_desc[i].status\n",
 240                             purb->iso_frame_desc[i].status);
 241                 }
 242
 243 #ifdef UPSAMPLE
 244                 peasycap->oldaudio = oldaudio;
 245 #endif /*UPSAMPLE*/
 246
 247         }
 248 /*---------------------------------------------------------------------------*/
 249 /*
 250  *  RESUBMIT THIS URB
 251  */
 252 /*---------------------------------------------------------------------------*/
 253 resubmit:
 254         if (peasycap->audio_isoc_streaming) {
 255                 rc = usb_submit_urb(purb, GFP_ATOMIC);
 256                 if (rc) {
 257                         if (-ENODEV != rc && -ENOENT != rc) {
 258                                 SAM("ERROR: while %i=audio_idle, "
 259                                     "usb_submit_urb() failed "
 260                                     "with rc: -%s: %d\n", peasycap->audio_idle,
 261                                     strerror(rc), rc);
 262                         }
 263                 }
 264         }
 265         return;
 266 }
 267 /*****************************************************************************/
 268 /*---------------------------------------------------------------------------*/
 269 /*
 270  *  THE AUDIO URBS ARE SUBMITTED AT THIS EARLY STAGE SO THAT IT IS POSSIBLE TO
 271  *  STREAM FROM /dev/easyoss1 WITH SIMPLE PROGRAMS SUCH AS cat WHICH DO NOT
 272  *  HAVE AN IOCTL INTERFACE.
 273  */
 274 /*---------------------------------------------------------------------------*/
 275 static int easyoss_open(struct inode *inode, struct file *file)
 276 {
 277         struct usb_interface *pusb_interface;
 278         struct easycap *peasycap;
 279         int subminor;
 280         struct v4l2_device *pv4l2_device;
 281
 282         JOT(4, "begins\n");
 283
 284         subminor = iminor(inode);
 285
 286         pusb_interface = usb_find_interface(&easycap_usb_driver, subminor);
 287         if (!pusb_interface) {
 288                 SAY("ERROR: pusb_interface is NULL\n");
 289                 SAY("ending unsuccessfully\n");
 290                 return -1;
 291         }
 292         peasycap = usb_get_intfdata(pusb_interface);
 293         if (!peasycap) {
 294                 SAY("ERROR: peasycap is NULL\n");
 295                 SAY("ending unsuccessfully\n");
 296                 return -1;
 297         }
 298 /*---------------------------------------------------------------------------*/
 299 /*
 300  *  SOME VERSIONS OF THE videodev MODULE OVERWRITE THE DATA WHICH HAS
 301  *  BEEN WRITTEN BY THE CALL TO usb_set_intfdata() IN easycap_usb_probe(),
 302  *  REPLACING IT WITH A POINTER TO THE EMBEDDED v4l2_device STRUCTURE.
 303  *  TO DETECT THIS, THE STRING IN THE easycap.telltale[] BUFFER IS CHECKED.
 304 */
 305 /*---------------------------------------------------------------------------*/
 306         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 307                 pv4l2_device = usb_get_intfdata(pusb_interface);
 308                 if (!pv4l2_device) {
 309                         SAY("ERROR: pv4l2_device is NULL\n");
 310                         return -EFAULT;
 311                 }
 312                 peasycap = container_of(pv4l2_device,
 313                                 struct easycap, v4l2_device);
 314         }
 315 /*---------------------------------------------------------------------------*/
 316         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 317                 SAY("ERROR: bad peasycap: %p\n", peasycap);
 318                 return -EFAULT;
 319         }
 320 /*---------------------------------------------------------------------------*/
 321
 322         file->private_data = peasycap;
 323
 324         if (0 != easycap_sound_setup(peasycap)) {
 325                 ;
 326                 ;
 327         }
 328         return 0;
 329 }
 330 /*****************************************************************************/
 331 static int easyoss_release(struct inode *inode, struct file *file)
 332 {
 333         struct easycap *peasycap;
 334
 335         JOT(4, "begins\n");
 336
 337         peasycap = file->private_data;
 338         if (!peasycap) {
 339                 SAY("ERROR:  peasycap is NULL.\n");
 340                 return -EFAULT;
 341         }
 342         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 343                 SAY("ERROR: bad peasycap: %p\n", peasycap);
 344                 return -EFAULT;
 345         }
 346         if (0 != kill_audio_urbs(peasycap)) {
 347                 SAM("ERROR: kill_audio_urbs() failed\n");
 348                 return -EFAULT;
 349         }
 350         JOM(4, "ending successfully\n");
 351         return 0;
 352 }
 353 /*****************************************************************************/
 354 static ssize_t easyoss_read(struct file *file, char __user *puserspacebuffer,
 355                             size_t kount, loff_t *poff)
 356 {
 357         struct timeval timeval;
 358         long long int above, below, mean;
 359         struct signed_div_result sdr;
 360         unsigned char *p0;
 361         long int kount1, more, rc, l0, lm;
 362         int fragment, kd;
 363         struct easycap *peasycap;
 364         struct data_buffer *pdata_buffer;
 365         size_t szret;
 366
 367 /*---------------------------------------------------------------------------*/
 368 /*
 369  *  DO A BLOCKING READ TO TRANSFER DATA TO USER SPACE.
 370  *
 371  ******************************************************************************
 372  *****  N.B.  IF THIS FUNCTION RETURNS 0, NOTHING IS SEEN IN USER SPACE. ******
 373  *****        THIS CONDITION SIGNIFIES END-OF-FILE.                      ******
 374  ******************************************************************************
 375  */
 376 /*---------------------------------------------------------------------------*/
 377
 378         JOT(8, "%5zd=kount  %5lld=*poff\n", kount, *poff);
 379
 380         if (!file) {
 381                 SAY("ERROR:  file is NULL\n");
 382                 return -ERESTARTSYS;
 383         }
 384         peasycap = file->private_data;
 385         if (!peasycap) {
 386                 SAY("ERROR in easyoss_read(): peasycap is NULL\n");
 387                 return -EFAULT;
 388         }
 389         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 390                 SAY("ERROR: bad peasycap: %p\n", peasycap);
 391                 return -EFAULT;
 392         }
 393         if (!peasycap->pusb_device) {
 394                 SAY("ERROR: peasycap->pusb_device is NULL\n");
 395                 return -EFAULT;
 396         }
 397         kd = isdongle(peasycap);
 398         if (0 <= kd && DONGLE_MANY > kd) {
 399                 if (mutex_lock_interruptible(&(easycapdc60_dongle[kd].mutex_audio))) {
 400                         SAY("ERROR: "
 401                             "cannot lock dongle[%i].mutex_audio\n", kd);
 402                         return -ERESTARTSYS;
 403                 }
 404                 JOM(4, "locked dongle[%i].mutex_audio\n", kd);
 405                 /*
 406                  *  MEANWHILE, easycap_usb_disconnect()
 407                  *  MAY HAVE FREED POINTER peasycap,
 408                  *  IN WHICH CASE A REPEAT CALL TO isdongle() WILL FAIL.
 409                  *  IF NECESSARY, BAIL OUT.
 410                  */
 411                 if (kd != isdongle(peasycap))
 412                         return -ERESTARTSYS;
 413                 if (!file) {
 414                         SAY("ERROR:  file is NULL\n");
 415                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 416                         return -ERESTARTSYS;
 417                 }
 418                 peasycap = file->private_data;
 419                 if (!peasycap) {
 420                         SAY("ERROR:  peasycap is NULL\n");
 421                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 422                         return -ERESTARTSYS;
 423                 }
 424                 if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 425                         SAY("ERROR: bad peasycap: %p\n", peasycap);
 426                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 427                         return -ERESTARTSYS;
 428                 }
 429                 if (!peasycap->pusb_device) {
 430                         SAM("ERROR: peasycap->pusb_device is NULL\n");
 431                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 432                         return -ERESTARTSYS;
 433                 }
 434         } else {
 435                 /*
 436                  *  IF easycap_usb_disconnect()
 437                  *  HAS ALREADY FREED POINTER peasycap BEFORE THE
 438                  *  ATTEMPT TO ACQUIRE THE SEMAPHORE,
 439                  *  isdongle() WILL HAVE FAILED.  BAIL OUT.
 440                  */
 441                 return -ERESTARTSYS;
 442         }
 443 /*---------------------------------------------------------------------------*/
 444         JOT(16, "%sBLOCKING kount=%zd, *poff=%lld\n",
 445                 (file->f_flags & O_NONBLOCK) ? "NON" : "", kount, *poff);
 446
 447         if ((0 > peasycap->audio_read) ||
 448             (peasycap->audio_buffer_page_many <= peasycap->audio_read)) {
 449                 SAM("ERROR: peasycap->audio_read out of range\n");
 450                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 451                 return -EFAULT;
 452         }
 453         pdata_buffer = &peasycap->audio_buffer[peasycap->audio_read];
 454         if (!pdata_buffer) {
 455                 SAM("ERROR: pdata_buffer is NULL\n");
 456                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 457                 return -EFAULT;
 458         }
 459         JOM(12, "before wait, %i=frag read  %i=frag fill\n",
 460             (peasycap->audio_read / peasycap->audio_pages_per_fragment),
 461             (peasycap->audio_fill / peasycap->audio_pages_per_fragment));
 462         fragment = (peasycap->audio_read / peasycap->audio_pages_per_fragment);
 463         while ((fragment == (peasycap->audio_fill / peasycap->audio_pages_per_fragment)) ||
 464                 (0 == (PAGE_SIZE - (pdata_buffer->pto - pdata_buffer->pgo)))) {
 465                 if (file->f_flags & O_NONBLOCK) {
 466                         JOM(16, "returning -EAGAIN as instructed\n");
 467                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 468                         return -EAGAIN;
 469                 }
 470                 rc = wait_event_interruptible(peasycap->wq_audio,
 471                                 (peasycap->audio_idle  || peasycap->audio_eof ||
 472                                 ((fragment !=
 473                                         (peasycap->audio_fill / peasycap->audio_pages_per_fragment)) &&
 474                                 (0 < (PAGE_SIZE - (pdata_buffer->pto - pdata_buffer->pgo))))));
 475                 if (rc) {
 476                         SAM("aborted by signal\n");
 477                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 478                         return -ERESTARTSYS;
 479                 }
 480                 if (peasycap->audio_eof) {
 481                         JOM(8, "returning 0 because  %i=audio_eof\n",
 482                             peasycap->audio_eof);
 483                         kill_audio_urbs(peasycap);
 484                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 485                         return 0;
 486                 }
 487                 if (peasycap->audio_idle) {
 488                         JOM(16, "returning 0 because  %i=audio_idle\n",
 489                             peasycap->audio_idle);
 490                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 491                         return 0;
 492                 }
 493                 if (!peasycap->audio_isoc_streaming) {
 494                         JOM(16, "returning 0 because audio urbs not streaming\n");
 495                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 496                         return 0;
 497                 }
 498         }
 499         JOM(12, "after  wait, %i=frag read  %i=frag fill\n",
 500             (peasycap->audio_read / peasycap->audio_pages_per_fragment),
 501             (peasycap->audio_fill / peasycap->audio_pages_per_fragment));
 502         szret = (size_t)0;
 503         fragment = (peasycap->audio_read / peasycap->audio_pages_per_fragment);
 504         while (fragment == (peasycap->audio_read / peasycap->audio_pages_per_fragment)) {
 505                 if (!pdata_buffer->pgo) {
 506                         SAM("ERROR: pdata_buffer->pgo is NULL\n");
 507                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 508                         return -EFAULT;
 509                 }
 510                 if (!pdata_buffer->pto) {
 511                         SAM("ERROR: pdata_buffer->pto is NULL\n");
 512                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 513                         return -EFAULT;
 514                 }
 515                 kount1 = PAGE_SIZE - (pdata_buffer->pto - pdata_buffer->pgo);
 516                 if (0 > kount1) {
 517                         SAM("MISTAKE: kount1 is negative\n");
 518                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 519                         return -ERESTARTSYS;
 520                 }
 521                 if (!kount1) {
 522                         peasycap->audio_read++;
 523                         if (peasycap->audio_buffer_page_many <= peasycap->audio_read)
 524                                 peasycap->audio_read = 0;
 525                         JOM(12, "bumped peasycap->audio_read to %i\n",
 526                             peasycap->audio_read);
 527
 528                         if (fragment != (peasycap->audio_read / peasycap->audio_pages_per_fragment))
 529                                 break;
 530
 531                         if ((0 > peasycap->audio_read) ||
 532                             (peasycap->audio_buffer_page_many <= peasycap->audio_read)) {
 533                                 SAM("ERROR: peasycap->audio_read out of range\n");
 534                                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 535                                 return -EFAULT;
 536                         }
 537                         pdata_buffer = &peasycap->audio_buffer[peasycap->audio_read];
 538                         if (!pdata_buffer) {
 539                                 SAM("ERROR: pdata_buffer is NULL\n");
 540                                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 541                                 return -EFAULT;
 542                         }
 543                         if (!pdata_buffer->pgo) {
 544                                 SAM("ERROR: pdata_buffer->pgo is NULL\n");
 545                                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 546                                 return -EFAULT;
 547                         }
 548                         if (!pdata_buffer->pto) {
 549                                 SAM("ERROR: pdata_buffer->pto is NULL\n");
 550                                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 551                                 return -EFAULT;
 552                         }
 553                         kount1 = PAGE_SIZE - (pdata_buffer->pto - pdata_buffer->pgo);
 554                 }
 555                 JOM(12, "ready  to send %zd bytes\n", kount1);
 556                 JOM(12, "still  to send %li bytes\n", (long int) kount);
 557                 more = kount1;
 558                 if (more > kount)
 559                         more = kount;
 560                 JOM(12, "agreed to send %li bytes from page %i\n",
 561                     more, peasycap->audio_read);
 562                 if (!more)
 563                         break;
 564
 565                 /*
 566                  *  ACCUMULATE DYNAMIC-RANGE INFORMATION
 567                  */
 568                 p0 = (unsigned char *)pdata_buffer->pgo;
 569                 l0 = 0;
 570                 lm = more/2;
 571                 while (l0 < lm) {
 572                         SUMMER(p0, &peasycap->audio_sample,
 573                                 &peasycap->audio_niveau,
 574                                 &peasycap->audio_square);
 575                         l0++;
 576                         p0 += 2;
 577                 }
 578                 /*-----------------------------------------------------------*/
 579                 rc = copy_to_user(puserspacebuffer, pdata_buffer->pto, more);
 580                 if (rc) {
 581                         SAM("ERROR: copy_to_user() returned %li\n", rc);
 582                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 583                         return -EFAULT;
 584                 }
 585                 *poff += (loff_t)more;
 586                 szret += (size_t)more;
 587                 pdata_buffer->pto += more;
 588                 puserspacebuffer += more;
 589                 kount -= (size_t)more;
 590         }
 591         JOM(12, "after  read, %i=frag read  %i=frag fill\n",
 592             (peasycap->audio_read / peasycap->audio_pages_per_fragment),
 593             (peasycap->audio_fill / peasycap->audio_pages_per_fragment));
 594         if (kount < 0) {
 595                 SAM("MISTAKE:  %li=kount  %li=szret\n",
 596                     (long int)kount, (long int)szret);
 597         }
 598 /*---------------------------------------------------------------------------*/
 599 /*
 600  *  CALCULATE DYNAMIC RANGE FOR (VAPOURWARE) AUTOMATIC VOLUME CONTROL
 601  */
 602 /*---------------------------------------------------------------------------*/
 603         if (peasycap->audio_sample) {
 604                 below = peasycap->audio_sample;
 605                 above = peasycap->audio_square;
 606                 sdr = signed_div(above, below);
 607                 above = sdr.quotient;
 608                 mean = peasycap->audio_niveau;
 609                 sdr = signed_div(mean, peasycap->audio_sample);
 610
 611                 JOM(8, "%8lli=mean  %8lli=meansquare after %lli samples, =>\n",
 612                     sdr.quotient, above, peasycap->audio_sample);
 613
 614                 sdr = signed_div(above, 32768);
 615                 JOM(8, "audio dynamic range is roughly %lli\n", sdr.quotient);
 616         }
 617 /*---------------------------------------------------------------------------*/
 618 /*
 619  *  UPDATE THE AUDIO CLOCK
 620  */
 621 /*---------------------------------------------------------------------------*/
 622         do_gettimeofday(&timeval);
 623         if (!peasycap->timeval1.tv_sec) {
 624                 peasycap->audio_bytes = 0;
 625                 peasycap->timeval3 = timeval;
 626                 peasycap->timeval1 = peasycap->timeval3;
 627                 sdr.quotient = 192000;
 628         } else {
 629                 peasycap->audio_bytes += (long long int) szret;
 630                 below = ((long long int)(1000000)) *
 631                         ((long long int)(timeval.tv_sec  - peasycap->timeval3.tv_sec)) +
 632                         (long long int)(timeval.tv_usec - peasycap->timeval3.tv_usec);
 633                 above = 1000000 * ((long long int) peasycap->audio_bytes);
 634
 635                 if (below)
 636                         sdr = signed_div(above, below);
 637                 else
 638                         sdr.quotient = 192000;
 639         }
 640         JOM(8, "audio streaming at %lli bytes/second\n", sdr.quotient);
 641         peasycap->dnbydt = sdr.quotient;
 642
 643         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 644         JOM(4, "unlocked easycapdc60_dongle[%i].mutex_audio\n", kd);
 645         JOM(8, "returning %li\n", (long int)szret);
 646         return szret;
 647
 648 }
 649 /*---------------------------------------------------------------------------*/
 650 static long easyoss_unlocked_ioctl(struct file *file,
 651                                    unsigned int cmd, unsigned long arg)
 652 {
 653         struct easycap *peasycap;
 654         struct usb_device *p;
 655         int kd;
 656
 657         if (!file) {
 658                 SAY("ERROR:  file is NULL\n");
 659                 return -ERESTARTSYS;
 660         }
 661         peasycap = file->private_data;
 662         if (!peasycap) {
 663                 SAY("ERROR:  peasycap is NULL.\n");
 664                 return -EFAULT;
 665         }
 666         if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 667                 SAY("ERROR: bad peasycap\n");
 668                 return -EFAULT;
 669         }
 670         p = peasycap->pusb_device;
 671         if (!p) {
 672                 SAM("ERROR: peasycap->pusb_device is NULL\n");
 673                 return -EFAULT;
 674         }
 675         kd = isdongle(peasycap);
 676         if (0 <= kd && DONGLE_MANY > kd) {
 677                 if (mutex_lock_interruptible(&easycapdc60_dongle[kd].mutex_audio)) {
 678                         SAY("ERROR: cannot lock "
 679                             "easycapdc60_dongle[%i].mutex_audio\n", kd);
 680                         return -ERESTARTSYS;
 681                 }
 682                 JOM(4, "locked easycapdc60_dongle[%i].mutex_audio\n", kd);
 683                 /*
 684                  *  MEANWHILE, easycap_usb_disconnect()
 685                  *  MAY HAVE FREED POINTER peasycap,
 686                  *  IN WHICH CASE A REPEAT CALL TO isdongle() WILL FAIL.
 687                  *  IF NECESSARY, BAIL OUT.
 688                 */
 689                 if (kd != isdongle(peasycap))
 690                         return -ERESTARTSYS;
 691                 if (!file) {
 692                         SAY("ERROR:  file is NULL\n");
 693                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 694                         return -ERESTARTSYS;
 695                 }
 696                 peasycap = file->private_data;
 697                 if (!peasycap) {
 698                         SAY("ERROR:  peasycap is NULL\n");
 699                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 700                         return -ERESTARTSYS;
 701                 }
 702                 if (memcmp(&peasycap->telltale[0], TELLTALE, strlen(TELLTALE))) {
 703                         SAY("ERROR: bad peasycap\n");
 704                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 705                         return -EFAULT;
 706                 }
 707                 p = peasycap->pusb_device;
 708                 if (!peasycap->pusb_device) {
 709                         SAM("ERROR: peasycap->pusb_device is NULL\n");
 710                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 711                         return -ERESTARTSYS;
 712                 }
 713         } else {
 714                 /*
 715                  *  IF easycap_usb_disconnect()
 716                  *  HAS ALREADY FREED POINTER peasycap BEFORE THE
 717                  *  ATTEMPT TO ACQUIRE THE SEMAPHORE,
 718                  *  isdongle() WILL HAVE FAILED.  BAIL OUT.
 719                  */
 720                 return -ERESTARTSYS;
 721         }
 722 /*---------------------------------------------------------------------------*/
 723         switch (cmd) {
 724         case SNDCTL_DSP_GETCAPS: {
 725                 int caps;
 726                 JOM(8, "SNDCTL_DSP_GETCAPS\n");
 727
 728 #ifdef UPSAMPLE
 729                 if (peasycap->microphone)
 730                         caps = 0x04400000;
 731                 else
 732                         caps = 0x04400000;
 733 #else
 734                 if (peasycap->microphone)
 735                         caps = 0x02400000;
 736                 else
 737                         caps = 0x04400000;
 738 #endif /*UPSAMPLE*/
 739
 740                 if (copy_to_user((void __user *)arg, &caps, sizeof(int))) {
 741                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 742                         return -EFAULT;
 743                 }
 744                 break;
 745         }
 746         case SNDCTL_DSP_GETFMTS: {
 747                 int incoming;
 748                 JOM(8, "SNDCTL_DSP_GETFMTS\n");
 749
 750 #ifdef UPSAMPLE
 751                 if (peasycap->microphone)
 752                         incoming = AFMT_S16_LE;
 753                 else
 754                         incoming = AFMT_S16_LE;
 755 #else
 756                 if (peasycap->microphone)
 757                         incoming = AFMT_S16_LE;
 758                 else
 759                         incoming = AFMT_S16_LE;
 760 #endif /*UPSAMPLE*/
 761
 762                 if (copy_to_user((void __user *)arg, &incoming, sizeof(int))) {
 763                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 764                         return -EFAULT;
 765                 }
 766                 break;
 767         }
 768         case SNDCTL_DSP_SETFMT: {
 769                 int incoming, outgoing;
 770                 JOM(8, "SNDCTL_DSP_SETFMT\n");
 771                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 772                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 773                         return -EFAULT;
 774                 }
 775                 JOM(8, "........... %i=incoming\n", incoming);
 776
 777 #ifdef UPSAMPLE
 778                 if (peasycap->microphone)
 779                         outgoing = AFMT_S16_LE;
 780                 else
 781                         outgoing = AFMT_S16_LE;
 782 #else
 783                 if (peasycap->microphone)
 784                         outgoing = AFMT_S16_LE;
 785                 else
 786                         outgoing = AFMT_S16_LE;
 787 #endif /*UPSAMPLE*/
 788
 789                 if (incoming != outgoing) {
 790                         JOM(8, "........... %i=outgoing\n", outgoing);
 791                         JOM(8, "        cf. %i=AFMT_S16_LE\n", AFMT_S16_LE);
 792                         JOM(8, "        cf. %i=AFMT_U8\n", AFMT_U8);
 793                         if (copy_to_user((void __user *)arg, &outgoing, sizeof(int))) {
 794                                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 795                                 return -EFAULT;
 796                         }
 797                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 798                         return -EINVAL ;
 799                 }
 800                 break;
 801         }
 802         case SNDCTL_DSP_STEREO: {
 803                 int incoming;
 804                 JOM(8, "SNDCTL_DSP_STEREO\n");
 805                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 806                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 807                         return -EFAULT;
 808                 }
 809                 JOM(8, "........... %i=incoming\n", incoming);
 810
 811 #ifdef UPSAMPLE
 812                 if (peasycap->microphone)
 813                         incoming = 1;
 814                 else
 815                         incoming = 1;
 816 #else
 817                 if (peasycap->microphone)
 818                         incoming = 0;
 819                 else
 820                         incoming = 1;
 821 #endif /*UPSAMPLE*/
 822
 823                 if (copy_to_user((void __user *)arg, &incoming, sizeof(int))) {
 824                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 825                         return -EFAULT;
 826                 }
 827                 break;
 828         }
 829         case SNDCTL_DSP_SPEED: {
 830                 int incoming;
 831                 JOM(8, "SNDCTL_DSP_SPEED\n");
 832                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 833                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 834                         return -EFAULT;
 835                 }
 836                 JOM(8, "........... %i=incoming\n", incoming);
 837
 838 #ifdef UPSAMPLE
 839                 if (peasycap->microphone)
 840                         incoming = 32000;
 841                 else
 842                         incoming = 48000;
 843 #else
 844                 if (peasycap->microphone)
 845                         incoming = 8000;
 846                 else
 847                         incoming = 48000;
 848 #endif /*UPSAMPLE*/
 849
 850                 if (copy_to_user((void __user *)arg, &incoming, sizeof(int))) {
 851                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 852                         return -EFAULT;
 853                 }
 854                 break;
 855         }
 856         case SNDCTL_DSP_GETTRIGGER: {
 857                 int incoming;
 858                 JOM(8, "SNDCTL_DSP_GETTRIGGER\n");
 859                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 860                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 861                         return -EFAULT;
 862                 }
 863                 JOM(8, "........... %i=incoming\n", incoming);
 864
 865                 incoming = PCM_ENABLE_INPUT;
 866                 if (copy_to_user((void __user *)arg, &incoming, sizeof(int))) {
 867                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 868                         return -EFAULT;
 869                 }
 870                 break;
 871         }
 872         case SNDCTL_DSP_SETTRIGGER: {
 873                 int incoming;
 874                 JOM(8, "SNDCTL_DSP_SETTRIGGER\n");
 875                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 876                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 877                         return -EFAULT;
 878                 }
 879                 JOM(8, "........... %i=incoming\n", incoming);
 880                 JOM(8, "........... cf 0x%x=PCM_ENABLE_INPUT "
 881                     "0x%x=PCM_ENABLE_OUTPUT\n",
 882                     PCM_ENABLE_INPUT, PCM_ENABLE_OUTPUT);
 883                 ;
 884                 ;
 885                 ;
 886                 ;
 887                 break;
 888         }
 889         case SNDCTL_DSP_GETBLKSIZE: {
 890                 int incoming;
 891                 JOM(8, "SNDCTL_DSP_GETBLKSIZE\n");
 892                 if (copy_from_user(&incoming, (void __user *)arg, sizeof(int))) {
 893                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 894                         return -EFAULT;
 895                 }
 896                 JOM(8, "........... %i=incoming\n", incoming);
 897                 incoming = peasycap->audio_bytes_per_fragment;
 898                 if (copy_to_user((void __user *)arg, &incoming, sizeof(int))) {
 899                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 900                         return -EFAULT;
 901                 }
 902                 break;
 903         }
 904         case SNDCTL_DSP_GETISPACE: {
 905                 struct audio_buf_info audio_buf_info;
 906
 907                 JOM(8, "SNDCTL_DSP_GETISPACE\n");
 908
 909                 audio_buf_info.bytes      = peasycap->audio_bytes_per_fragment;
 910                 audio_buf_info.fragments  = 1;
 911                 audio_buf_info.fragsize   = 0;
 912                 audio_buf_info.fragstotal = 0;
 913
 914                 if (copy_to_user((void __user *)arg, &audio_buf_info, sizeof(int))) {
 915                         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 916                         return -EFAULT;
 917                 }
 918                 break;
 919         }
 920         case 0x00005401:
 921         case 0x00005402:
 922         case 0x00005403:
 923         case 0x00005404:
 924         case 0x00005405:
 925         case 0x00005406: {
 926                 JOM(8, "SNDCTL_TMR_...: 0x%08X unsupported\n", cmd);
 927                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 928                 return -ENOIOCTLCMD;
 929         }
 930         default: {
 931                 JOM(8, "ERROR: unrecognized DSP IOCTL command: 0x%08X\n", cmd);
 932                 mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 933                 return -ENOIOCTLCMD;
 934         }
 935         }
 936         mutex_unlock(&easycapdc60_dongle[kd].mutex_audio);
 937         return 0;
 938 }
 939 /*****************************************************************************/
 940
 941 static const struct file_operations easyoss_fops = {
 942         .owner          = THIS_MODULE,
 943         .open           = easyoss_open,
 944         .release        = easyoss_release,
 945         .unlocked_ioctl = easyoss_unlocked_ioctl,
 946         .read           = easyoss_read,
 947         .llseek         = no_llseek,
 948 };
 949 struct usb_class_driver easyoss_class = {
 950         .name = "usb/easyoss%d",
 951         .fops = &easyoss_fops,
 952         .minor_base = USB_SKEL_MINOR_BASE,
 953 };
 954 /*****************************************************************************/