drivers/media/video/dabusb.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      dabusb.c  --  dab usb driver.
   5  *
   6  *      Copyright (C) 1999  Deti Fliegl (deti@fliegl.de)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *
  23  *
  24  *  $Id: dabusb.c,v 1.54 2000/07/24 21:39:39 deti Exp $
  25  *
  26  */
  27
  28 /*****************************************************************************/
  29
  30 #include <linux/module.h>
  31 #include <linux/socket.h>
  32 #include <linux/list.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/slab.h>
  35 #include <linux/init.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/atomic.h>
  38 #include <linux/delay.h>
  39 #include <linux/usb.h>
  40 #include <linux/mutex.h>
  41 #include <linux/firmware.h>
  42 #include <linux/ihex.h>
  43
  44 #include "dabusb.h"
  45
  46 /*
  47  * Version Information
  48  */
  49 #define DRIVER_VERSION "v1.54"
  50 #define DRIVER_AUTHOR "Deti Fliegl, deti@fliegl.de"
  51 #define DRIVER_DESC "DAB-USB Interface Driver for Linux (c)1999"
  52
  53 /* --------------------------------------------------------------------- */
  54
  55 #ifdef CONFIG_USB_DYNAMIC_MINORS
  56 #define NRDABUSB 256
  57 #else
  58 #define NRDABUSB 4
  59 #endif
  60
  61 /*-------------------------------------------------------------------*/
  62
  63 static dabusb_t dabusb[NRDABUSB];
  64 static int buffers = 256;
  65 static struct usb_driver dabusb_driver;
  66
  67 /*-------------------------------------------------------------------*/
  68
  69 static int dabusb_add_buf_tail (pdabusb_t s, struct list_head *dst, struct list_head *src)
  70 {
  71         unsigned long flags;
  72         struct list_head *tmp;
  73         int ret = 0;
  74
  75         spin_lock_irqsave (&s->lock, flags);
  76
  77         if (list_empty (src)) {
  78                 // no elements in source buffer
  79                 ret = -1;
  80                 goto err;
  81         }
  82         tmp = src->next;
  83         list_move_tail (tmp, dst);
  84
  85   err:  spin_unlock_irqrestore (&s->lock, flags);
  86         return ret;
  87 }
  88 /*-------------------------------------------------------------------*/
  89 #ifdef DEBUG
  90 static void dump_urb (struct urb *urb)
  91 {
  92         dbg("urb                   :%p", urb);
  93         dbg("dev                   :%p", urb->dev);
  94         dbg("pipe                  :%08X", urb->pipe);
  95         dbg("status                :%d", urb->status);
  96         dbg("transfer_flags        :%08X", urb->transfer_flags);
  97         dbg("transfer_buffer       :%p", urb->transfer_buffer);
  98         dbg("transfer_buffer_length:%d", urb->transfer_buffer_length);
  99         dbg("actual_length         :%d", urb->actual_length);
 100         dbg("setup_packet          :%p", urb->setup_packet);
 101         dbg("start_frame           :%d", urb->start_frame);
 102         dbg("number_of_packets     :%d", urb->number_of_packets);
 103         dbg("interval              :%d", urb->interval);
 104         dbg("error_count           :%d", urb->error_count);
 105         dbg("context               :%p", urb->context);
 106         dbg("complete              :%p", urb->complete);
 107 }
 108 #endif
 109 /*-------------------------------------------------------------------*/
 110 static int dabusb_cancel_queue (pdabusb_t s, struct list_head *q)
 111 {
 112         unsigned long flags;
 113         pbuff_t b;
 114
 115         dbg("dabusb_cancel_queue");
 116
 117         spin_lock_irqsave (&s->lock, flags);
 118
 119         list_for_each_entry(b, q, buff_list) {
 120 #ifdef DEBUG
 121                 dump_urb(b->purb);
 122 #endif
 123                 usb_unlink_urb (b->purb);
 124         }
 125         spin_unlock_irqrestore (&s->lock, flags);
 126         return 0;
 127 }
 128 /*-------------------------------------------------------------------*/
 129 static int dabusb_free_queue (struct list_head *q)
 130 {
 131         struct list_head *tmp;
 132         struct list_head *p;
 133         pbuff_t b;
 134
 135         dbg("dabusb_free_queue");
 136         for (p = q->next; p != q;) {
 137                 b = list_entry (p, buff_t, buff_list);
 138
 139 #ifdef DEBUG
 140                 dump_urb(b->purb);
 141 #endif
 142                 kfree(b->purb->transfer_buffer);
 143                 usb_free_urb(b->purb);
 144                 tmp = p->next;
 145                 list_del (p);
 146                 kfree (b);
 147                 p = tmp;
 148         }
 149
 150         return 0;
 151 }
 152 /*-------------------------------------------------------------------*/
 153 static int dabusb_free_buffers (pdabusb_t s)
 154 {
 155         unsigned long flags;
 156         dbg("dabusb_free_buffers");
 157
 158         spin_lock_irqsave(&s->lock, flags);
 159
 160         dabusb_free_queue (&s->free_buff_list);
 161         dabusb_free_queue (&s->rec_buff_list);
 162
 163         spin_unlock_irqrestore(&s->lock, flags);
 164
 165         s->got_mem = 0;
 166         return 0;
 167 }
 168 /*-------------------------------------------------------------------*/
 169 static void dabusb_iso_complete (struct urb *purb)
 170 {
 171         pbuff_t b = purb->context;
 172         pdabusb_t s = b->s;
 173         int i;
 174         int len;
 175         int dst = 0;
 176         void *buf = purb->transfer_buffer;
 177
 178         dbg("dabusb_iso_complete");
 179
 180         // process if URB was not killed
 181         if (purb->status != -ENOENT) {
 182                 unsigned int pipe = usb_rcvisocpipe (purb->dev, _DABUSB_ISOPIPE);
 183                 int pipesize = usb_maxpacket (purb->dev, pipe, usb_pipeout (pipe));
 184                 for (i = 0; i < purb->number_of_packets; i++)
 185                         if (!purb->iso_frame_desc[i].status) {
 186                                 len = purb->iso_frame_desc[i].actual_length;
 187                                 if (len <= pipesize) {
 188                                         memcpy (buf + dst, buf + purb->iso_frame_desc[i].offset, len);
 189                                         dst += len;
 190                                 }
 191                                 else
 192                                         err("dabusb_iso_complete: invalid len %d", len);
 193                         }
 194                         else
 195                                 dev_warn(&purb->dev->dev, "dabusb_iso_complete: corrupted packet status: %d\n", purb->iso_frame_desc[i].status);
 196                 if (dst != purb->actual_length)
 197                         err("dst!=purb->actual_length:%d!=%d", dst, purb->actual_length);
 198         }
 199
 200         if (atomic_dec_and_test (&s->pending_io) && !s->remove_pending && s->state != _stopped) {
 201                 s->overruns++;
 202                 err("overrun (%d)", s->overruns);
 203         }
 204         wake_up (&s->wait);
 205 }
 206 /*-------------------------------------------------------------------*/
 207 static int dabusb_alloc_buffers (pdabusb_t s)
 208 {
 209         int transfer_len = 0;
 210         pbuff_t b;
 211         unsigned int pipe = usb_rcvisocpipe (s->usbdev, _DABUSB_ISOPIPE);
 212         int pipesize = usb_maxpacket (s->usbdev, pipe, usb_pipeout (pipe));
 213         int packets = _ISOPIPESIZE / pipesize;
 214         int transfer_buffer_length = packets * pipesize;
 215         int i;
 216
 217         dbg("dabusb_alloc_buffers pipesize:%d packets:%d transfer_buffer_len:%d",
 218                  pipesize, packets, transfer_buffer_length);
 219
 220         while (transfer_len < (s->total_buffer_size << 10)) {
 221                 b = kzalloc(sizeof (buff_t), GFP_KERNEL);
 222                 if (!b) {
 223                         err("kzalloc(sizeof(buff_t))==NULL");
 224                         goto err;
 225                 }
 226                 b->s = s;
 227                 b->purb = usb_alloc_urb(packets, GFP_KERNEL);
 228                 if (!b->purb) {
 229                         err("usb_alloc_urb == NULL");
 230                         kfree (b);
 231                         goto err;
 232                 }
 233
 234                 b->purb->transfer_buffer = kmalloc (transfer_buffer_length, GFP_KERNEL);
 235                 if (!b->purb->transfer_buffer) {
 236                         kfree (b->purb);
 237                         kfree (b);
 238                         err("kmalloc(%d)==NULL", transfer_buffer_length);
 239                         goto err;
 240                 }
 241
 242                 b->purb->transfer_buffer_length = transfer_buffer_length;
 243                 b->purb->number_of_packets = packets;
 244                 b->purb->complete = dabusb_iso_complete;
 245                 b->purb->context = b;
 246                 b->purb->dev = s->usbdev;
 247                 b->purb->pipe = pipe;
 248                 b->purb->transfer_flags = URB_ISO_ASAP;
 249
 250                 for (i = 0; i < packets; i++) {
 251                         b->purb->iso_frame_desc[i].offset = i * pipesize;
 252                         b->purb->iso_frame_desc[i].length = pipesize;
 253                 }
 254
 255                 transfer_len += transfer_buffer_length;
 256                 list_add_tail (&b->buff_list, &s->free_buff_list);
 257         }
 258         s->got_mem = transfer_len;
 259
 260         return 0;
 261
 262         err:
 263         dabusb_free_buffers (s);
 264         return -ENOMEM;
 265 }
 266 /*-------------------------------------------------------------------*/
 267 static int dabusb_bulk (pdabusb_t s, pbulk_transfer_t pb)
 268 {
 269         int ret;
 270         unsigned int pipe;
 271         int actual_length;
 272
 273         dbg("dabusb_bulk");
 274
 275         if (!pb->pipe)
 276                 pipe = usb_rcvbulkpipe (s->usbdev, 2);
 277         else
 278                 pipe = usb_sndbulkpipe (s->usbdev, 2);
 279
 280         ret=usb_bulk_msg(s->usbdev, pipe, pb->data, pb->size, &actual_length, 100);
 281         if(ret<0) {
 282                 err("dabusb: usb_bulk_msg failed(%d)",ret);
 283
 284                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
 285                         err("set_interface failed");
 286                         return -EINVAL;
 287                 }
 288
 289         }
 290
 291         if( ret == -EPIPE ) {
 292                 dev_warn(&s->usbdev->dev, "CLEAR_FEATURE request to remove STALL condition.\n");
 293                 if(usb_clear_halt(s->usbdev, usb_pipeendpoint(pipe)))
 294                         err("request failed");
 295         }
 296
 297         pb->size = actual_length;
 298         return ret;
 299 }
 300 /* --------------------------------------------------------------------- */
 301 static int dabusb_writemem (pdabusb_t s, int pos, const unsigned char *data,
 302                             int len)
 303 {
 304         int ret;
 305         unsigned char *transfer_buffer =  kmalloc (len, GFP_KERNEL);
 306
 307         if (!transfer_buffer) {
 308                 err("dabusb_writemem: kmalloc(%d) failed.", len);
 309                 return -ENOMEM;
 310         }
 311
 312         memcpy (transfer_buffer, data, len);
 313
 314         ret=usb_control_msg(s->usbdev, usb_sndctrlpipe( s->usbdev, 0 ), 0xa0, 0x40, pos, 0, transfer_buffer, len, 300);
 315
 316         kfree (transfer_buffer);
 317         return ret;
 318 }
 319 /* --------------------------------------------------------------------- */
 320 static int dabusb_8051_reset (pdabusb_t s, unsigned char reset_bit)
 321 {
 322         dbg("dabusb_8051_reset: %d",reset_bit);
 323         return dabusb_writemem (s, CPUCS_REG, &reset_bit, 1);
 324 }
 325 /* --------------------------------------------------------------------- */
 326 static int dabusb_loadmem (pdabusb_t s, const char *fname)
 327 {
 328         int ret;
 329         const struct ihex_binrec *rec;
 330         const struct firmware *fw;
 331
 332         dbg("Enter dabusb_loadmem (internal)");
 333
 334         ret = request_ihex_firmware(&fw, "dabusb/firmware.fw", &s->usbdev->dev);
 335         if (ret) {
 336                 err("Failed to load \"dabusb/firmware.fw\": %d\n", ret);
 337                 goto out;
 338         }
 339         ret = dabusb_8051_reset (s, 1);
 340
 341         for (rec = (const struct ihex_binrec *)fw->data; rec;
 342              rec = ihex_next_binrec(rec)) {
 343                 dbg("dabusb_writemem: %04X %p %d)", be32_to_cpu(rec->addr),
 344                     rec->data, be16_to_cpu(rec->len));
 345
 346                 ret = dabusb_writemem(s, be32_to_cpu(rec->addr), rec->data,
 347                                        be16_to_cpu(rec->len));
 348                 if (ret < 0) {
 349                         err("dabusb_writemem failed (%d %04X %p %d)", ret,
 350                             be32_to_cpu(rec->addr), rec->data,
 351                             be16_to_cpu(rec->len));
 352                         break;
 353                 }
 354         }
 355         ret = dabusb_8051_reset (s, 0);
 356         release_firmware(fw);
 357  out:
 358         dbg("dabusb_loadmem: exit");
 359
 360         return ret;
 361 }
 362 /* --------------------------------------------------------------------- */
 363 static int dabusb_fpga_clear (pdabusb_t s, pbulk_transfer_t b)
 364 {
 365         b->size = 4;
 366         b->data[0] = 0x2a;
 367         b->data[1] = 0;
 368         b->data[2] = 0;
 369         b->data[3] = 0;
 370
 371         dbg("dabusb_fpga_clear");
 372
 373         return dabusb_bulk (s, b);
 374 }
 375 /* --------------------------------------------------------------------- */
 376 static int dabusb_fpga_init (pdabusb_t s, pbulk_transfer_t b)
 377 {
 378         b->size = 4;
 379         b->data[0] = 0x2c;
 380         b->data[1] = 0;
 381         b->data[2] = 0;
 382         b->data[3] = 0;
 383
 384         dbg("dabusb_fpga_init");
 385
 386         return dabusb_bulk (s, b);
 387 }
 388 /* --------------------------------------------------------------------- */
 389 static int dabusb_fpga_download (pdabusb_t s, const char *fname)
 390 {
 391         pbulk_transfer_t b = kmalloc (sizeof (bulk_transfer_t), GFP_KERNEL);
 392         const struct firmware *fw;
 393         unsigned int blen, n;
 394         int ret;
 395
 396         dbg("Enter dabusb_fpga_download (internal)");
 397
 398         if (!b) {
 399                 err("kmalloc(sizeof(bulk_transfer_t))==NULL");
 400                 return -ENOMEM;
 401         }
 402
 403         ret = request_firmware(&fw, "dabusb/bitstream.bin", &s->usbdev->dev);
 404         if (ret) {
 405                 err("Failed to load \"dabusb/bitstream.bin\": %d\n", ret);
 406                 kfree(b);
 407                 return ret;
 408         }
 409
 410         b->pipe = 1;
 411         ret = dabusb_fpga_clear (s, b);
 412         mdelay (10);
 413         blen = fw->data[73] + (fw->data[72] << 8);
 414
 415         dbg("Bitstream len: %i", blen);
 416
 417         b->data[0] = 0x2b;
 418         b->data[1] = 0;
 419         b->data[2] = 0;
 420         b->data[3] = 60;
 421
 422         for (n = 0; n <= blen + 60; n += 60) {
 423                 // some cclks for startup
 424                 b->size = 64;
 425                 memcpy (b->data + 4, fw->data + 74 + n, 60);
 426                 ret = dabusb_bulk (s, b);
 427                 if (ret < 0) {
 428                         err("dabusb_bulk failed.");
 429                         break;
 430                 }
 431                 mdelay (1);
 432         }
 433
 434         ret = dabusb_fpga_init (s, b);
 435         kfree (b);
 436         release_firmware(fw);
 437
 438         dbg("exit dabusb_fpga_download");
 439
 440         return ret;
 441 }
 442
 443 static int dabusb_stop (pdabusb_t s)
 444 {
 445         dbg("dabusb_stop");
 446
 447         s->state = _stopped;
 448         dabusb_cancel_queue (s, &s->rec_buff_list);
 449
 450         dbg("pending_io: %d", s->pending_io.counter);
 451
 452         s->pending_io.counter = 0;
 453         return 0;
 454 }
 455
 456 static int dabusb_startrek (pdabusb_t s)
 457 {
 458         if (!s->got_mem && s->state != _started) {
 459
 460                 dbg("dabusb_startrek");
 461
 462                 if (dabusb_alloc_buffers (s) < 0)
 463                         return -ENOMEM;
 464                 dabusb_stop (s);
 465                 s->state = _started;
 466                 s->readptr = 0;
 467         }
 468
 469         if (!list_empty (&s->free_buff_list)) {
 470                 pbuff_t end;
 471                 int ret;
 472
 473         while (!dabusb_add_buf_tail (s, &s->rec_buff_list, &s->free_buff_list)) {
 474
 475                         dbg("submitting: end:%p s->rec_buff_list:%p", s->rec_buff_list.prev, &s->rec_buff_list);
 476
 477                         end = list_entry (s->rec_buff_list.prev, buff_t, buff_list);
 478
 479                         ret = usb_submit_urb (end->purb, GFP_KERNEL);
 480                         if (ret) {
 481                                 err("usb_submit_urb returned:%d", ret);
 482                                 if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
 483                                         err("startrek: dabusb_add_buf_tail failed");
 484                                 break;
 485                         }
 486                         else
 487                                 atomic_inc (&s->pending_io);
 488                 }
 489                 dbg("pending_io: %d",s->pending_io.counter);
 490         }
 491
 492         return 0;
 493 }
 494
 495 static ssize_t dabusb_read (struct file *file, char __user *buf, size_t count, loff_t * ppos)
 496 {
 497         pdabusb_t s = (pdabusb_t) file->private_data;
 498         unsigned long flags;
 499         unsigned ret = 0;
 500         int rem;
 501         int cnt;
 502         pbuff_t b;
 503         struct urb *purb = NULL;
 504
 505         dbg("dabusb_read");
 506
 507         if (*ppos)
 508                 return -ESPIPE;
 509
 510         if (s->remove_pending)
 511                 return -EIO;
 512
 513
 514         if (!s->usbdev)
 515                 return -EIO;
 516
 517         while (count > 0) {
 518                 dabusb_startrek (s);
 519
 520                 spin_lock_irqsave (&s->lock, flags);
 521
 522                 if (list_empty (&s->rec_buff_list)) {
 523
 524                         spin_unlock_irqrestore(&s->lock, flags);
 525
 526                         err("error: rec_buf_list is empty");
 527                         goto err;
 528                 }
 529
 530                 b = list_entry (s->rec_buff_list.next, buff_t, buff_list);
 531                 purb = b->purb;
 532
 533                 spin_unlock_irqrestore(&s->lock, flags);
 534
 535                 if (purb->status == -EINPROGRESS) {
 536                         if (file->f_flags & O_NONBLOCK)         // return nonblocking
 537                          {
 538                                 if (!ret)
 539                                         ret = -EAGAIN;
 540                                 goto err;
 541                         }
 542
 543                         interruptible_sleep_on (&s->wait);
 544
 545                         if (signal_pending (current)) {
 546                                 if (!ret)
 547                                         ret = -ERESTARTSYS;
 548                                 goto err;
 549                         }
 550
 551                         spin_lock_irqsave (&s->lock, flags);
 552
 553                         if (list_empty (&s->rec_buff_list)) {
 554                                 spin_unlock_irqrestore(&s->lock, flags);
 555                                 err("error: still no buffer available.");
 556                                 goto err;
 557                         }
 558                         spin_unlock_irqrestore(&s->lock, flags);
 559                         s->readptr = 0;
 560                 }
 561                 if (s->remove_pending) {
 562                         ret = -EIO;
 563                         goto err;
 564                 }
 565
 566                 rem = purb->actual_length - s->readptr;         // set remaining bytes to copy
 567
 568                 if (count >= rem)
 569                         cnt = rem;
 570                 else
 571                         cnt = count;
 572
 573                 dbg("copy_to_user:%p %p %d",buf, purb->transfer_buffer + s->readptr, cnt);
 574
 575                 if (copy_to_user (buf, purb->transfer_buffer + s->readptr, cnt)) {
 576                         err("read: copy_to_user failed");
 577                         if (!ret)
 578                                 ret = -EFAULT;
 579                         goto err;
 580                 }
 581
 582                 s->readptr += cnt;
 583                 count -= cnt;
 584                 buf += cnt;
 585                 ret += cnt;
 586
 587                 if (s->readptr == purb->actual_length) {
 588                         // finished, take next buffer
 589                         if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
 590                                 err("read: dabusb_add_buf_tail failed");
 591                         s->readptr = 0;
 592                 }
 593         }
 594       err:                      //mutex_unlock(&s->mutex);
 595         return ret;
 596 }
 597
 598 static int dabusb_open (struct inode *inode, struct file *file)
 599 {
 600         int devnum = iminor(inode);
 601         pdabusb_t s;
 602
 603         if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
 604                 return -EIO;
 605
 606         s = &dabusb[devnum - DABUSB_MINOR];
 607
 608         dbg("dabusb_open");
 609         mutex_lock(&s->mutex);
 610
 611         while (!s->usbdev || s->opened) {
 612                 mutex_unlock(&s->mutex);
 613
 614                 if (file->f_flags & O_NONBLOCK) {
 615                         return -EBUSY;
 616                 }
 617                 msleep_interruptible(500);
 618
 619                 if (signal_pending (current)) {
 620                         return -EAGAIN;
 621                 }
 622                 mutex_lock(&s->mutex);
 623         }
 624         if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
 625                 mutex_unlock(&s->mutex);
 626                 err("set_interface failed");
 627                 return -EINVAL;
 628         }
 629         s->opened = 1;
 630         mutex_unlock(&s->mutex);
 631
 632         file->f_pos = 0;
 633         file->private_data = s;
 634
 635         return nonseekable_open(inode, file);
 636 }
 637
 638 static int dabusb_release (struct inode *inode, struct file *file)
 639 {
 640         pdabusb_t s = (pdabusb_t) file->private_data;
 641
 642         dbg("dabusb_release");
 643
 644         mutex_lock(&s->mutex);
 645         dabusb_stop (s);
 646         dabusb_free_buffers (s);
 647         mutex_unlock(&s->mutex);
 648
 649         if (!s->remove_pending) {
 650                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0)
 651                         err("set_interface failed");
 652         }
 653         else
 654                 wake_up (&s->remove_ok);
 655
 656         s->opened = 0;
 657         return 0;
 658 }
 659
 660 static int dabusb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 661 {
 662         pdabusb_t s = (pdabusb_t) file->private_data;
 663         pbulk_transfer_t pbulk;
 664         int ret = 0;
 665         int version = DABUSB_VERSION;
 666
 667         dbg("dabusb_ioctl");
 668
 669         if (s->remove_pending)
 670                 return -EIO;
 671
 672         mutex_lock(&s->mutex);
 673
 674         if (!s->usbdev) {
 675                 mutex_unlock(&s->mutex);
 676                 return -EIO;
 677         }
 678
 679         switch (cmd) {
 680
 681         case IOCTL_DAB_BULK:
 682                 pbulk = kmalloc(sizeof (bulk_transfer_t), GFP_KERNEL);
 683
 684                 if (!pbulk) {
 685                         ret = -ENOMEM;
 686                         break;
 687                 }
 688
 689                 if (copy_from_user (pbulk, (void __user *) arg, sizeof (bulk_transfer_t))) {
 690                         ret = -EFAULT;
 691                         kfree (pbulk);
 692                         break;
 693                 }
 694
 695                 ret=dabusb_bulk (s, pbulk);
 696                 if(ret==0)
 697                         if (copy_to_user((void __user *)arg, pbulk,
 698                                          sizeof(bulk_transfer_t)))
 699                                 ret = -EFAULT;
 700                 kfree (pbulk);
 701                 break;
 702
 703         case IOCTL_DAB_OVERRUNS:
 704                 ret = put_user (s->overruns, (unsigned int __user *) arg);
 705                 break;
 706
 707         case IOCTL_DAB_VERSION:
 708                 ret = put_user (version, (unsigned int __user *) arg);
 709                 break;
 710
 711         default:
 712                 ret = -ENOIOCTLCMD;
 713                 break;
 714         }
 715         mutex_unlock(&s->mutex);
 716         return ret;
 717 }
 718
 719 static const struct file_operations dabusb_fops =
 720 {
 721         .owner =        THIS_MODULE,
 722         .llseek =       no_llseek,
 723         .read =         dabusb_read,
 724         .ioctl =        dabusb_ioctl,
 725         .open =         dabusb_open,
 726         .release =      dabusb_release,
 727 };
 728
 729 static struct usb_class_driver dabusb_class = {
 730         .name =         "dabusb%d",
 731         .fops =         &dabusb_fops,
 732         .minor_base =   DABUSB_MINOR,
 733 };
 734
 735
 736 /* --------------------------------------------------------------------- */
 737 static int dabusb_probe (struct usb_interface *intf,
 738                          const struct usb_device_id *id)
 739 {
 740         struct usb_device *usbdev = interface_to_usbdev(intf);
 741         int retval;
 742         pdabusb_t s;
 743
 744         dbg("dabusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d",
 745             le16_to_cpu(usbdev->descriptor.idVendor),
 746             le16_to_cpu(usbdev->descriptor.idProduct),
 747             intf->altsetting->desc.bInterfaceNumber);
 748
 749         /* We don't handle multiple configurations */
 750         if (usbdev->descriptor.bNumConfigurations != 1)
 751                 return -ENODEV;
 752
 753         if (intf->altsetting->desc.bInterfaceNumber != _DABUSB_IF &&
 754             le16_to_cpu(usbdev->descriptor.idProduct) == 0x9999)
 755                 return -ENODEV;
 756
 757
 758
 759         s = &dabusb[intf->minor];
 760
 761         mutex_lock(&s->mutex);
 762         s->remove_pending = 0;
 763         s->usbdev = usbdev;
 764         s->devnum = intf->minor;
 765
 766         if (usb_reset_configuration (usbdev) < 0) {
 767                 err("reset_configuration failed");
 768                 goto reject;
 769         }
 770         if (le16_to_cpu(usbdev->descriptor.idProduct) == 0x2131) {
 771                 dabusb_loadmem (s, NULL);
 772                 goto reject;
 773         }
 774         else {
 775                 dabusb_fpga_download (s, NULL);
 776
 777                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0) {
 778                         err("set_interface failed");
 779                         goto reject;
 780                 }
 781         }
 782         dbg("bound to interface: %d", intf->altsetting->desc.bInterfaceNumber);
 783         usb_set_intfdata (intf, s);
 784         mutex_unlock(&s->mutex);
 785
 786         retval = usb_register_dev(intf, &dabusb_class);
 787         if (retval) {
 788                 usb_set_intfdata (intf, NULL);
 789                 return -ENOMEM;
 790         }
 791
 792         return 0;
 793
 794       reject:
 795         mutex_unlock(&s->mutex);
 796         s->usbdev = NULL;
 797         return -ENODEV;
 798 }
 799
 800 static void dabusb_disconnect (struct usb_interface *intf)
 801 {
 802         wait_queue_t __wait;
 803         pdabusb_t s = usb_get_intfdata (intf);
 804
 805         dbg("dabusb_disconnect");
 806
 807         init_waitqueue_entry(&__wait, current);
 808
 809         usb_set_intfdata (intf, NULL);
 810         if (s) {
 811                 usb_deregister_dev (intf, &dabusb_class);
 812                 s->remove_pending = 1;
 813                 wake_up (&s->wait);
 814                 add_wait_queue(&s->remove_ok, &__wait);
 815                 set_current_state(TASK_UNINTERRUPTIBLE);
 816                 if (s->state == _started)
 817                         schedule();
 818                 current->state = TASK_RUNNING;
 819                 remove_wait_queue(&s->remove_ok, &__wait);
 820
 821                 s->usbdev = NULL;
 822                 s->overruns = 0;
 823         }
 824 }
 825
 826 static struct usb_device_id dabusb_ids [] = {
 827         // { USB_DEVICE(0x0547, 0x2131) },      /* An2131 chip, no boot ROM */
 828         { USB_DEVICE(0x0547, 0x9999) },
 829         { }                                             /* Terminating entry */
 830 };
 831
 832 MODULE_DEVICE_TABLE (usb, dabusb_ids);
 833
 834 static struct usb_driver dabusb_driver = {
 835         .name =         "dabusb",
 836         .probe =        dabusb_probe,
 837         .disconnect =   dabusb_disconnect,
 838         .id_table =     dabusb_ids,
 839 };
 840
 841 /* --------------------------------------------------------------------- */
 842
 843 static int __init dabusb_init (void)
 844 {
 845         int retval;
 846         unsigned u;
 847
 848         /* initialize struct */
 849         for (u = 0; u < NRDABUSB; u++) {
 850                 pdabusb_t s = &dabusb[u];
 851                 memset (s, 0, sizeof (dabusb_t));
 852                 mutex_init (&s->mutex);
 853                 s->usbdev = NULL;
 854                 s->total_buffer_size = buffers;
 855                 init_waitqueue_head (&s->wait);
 856                 init_waitqueue_head (&s->remove_ok);
 857                 spin_lock_init (&s->lock);
 858                 INIT_LIST_HEAD (&s->free_buff_list);
 859                 INIT_LIST_HEAD (&s->rec_buff_list);
 860         }
 861
 862         /* register misc device */
 863         retval = usb_register(&dabusb_driver);
 864         if (retval)
 865                 goto out;
 866
 867         dbg("dabusb_init: driver registered");
 868
 869         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 870                DRIVER_DESC "\n");
 871
 872 out:
 873         return retval;
 874 }
 875
 876 static void __exit dabusb_cleanup (void)
 877 {
 878         dbg("dabusb_cleanup");
 879
 880         usb_deregister (&dabusb_driver);
 881 }
 882
 883 /* --------------------------------------------------------------------- */
 884
 885 MODULE_AUTHOR( DRIVER_AUTHOR );
 886 MODULE_DESCRIPTION( DRIVER_DESC );
 887 MODULE_LICENSE("GPL");
 888
 889 module_param(buffers, int, 0);
 890 MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
 891
 892 module_init (dabusb_init);
 893 module_exit (dabusb_cleanup);
 894
 895 /* --------------------------------------------------------------------- */