git.oblomov.eu Git - linux-2.6/blob - 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                                         dev_err(&purb->dev->dev,
 193                                                 "dabusb_iso_complete: invalid len %d\n", len);
 194                         }
 195                         else
 196                                 dev_warn(&purb->dev->dev, "dabusb_iso_complete: corrupted packet status: %d\n", purb->iso_frame_desc[i].status);
 197                 if (dst != purb->actual_length)
 198                         dev_err(&purb->dev->dev,
 199                                 "dst!=purb->actual_length:%d!=%d\n",
 200                                         dst, purb->actual_length);
 201         }
 202
 203         if (atomic_dec_and_test (&s->pending_io) && !s->remove_pending && s->state != _stopped) {
 204                 s->overruns++;
 205                 dev_err(&purb->dev->dev, "overrun (%d)\n", s->overruns);
 206         }
 207         wake_up (&s->wait);
 208 }
 209 /*-------------------------------------------------------------------*/
 210 static int dabusb_alloc_buffers (pdabusb_t s)
 211 {
 212         int transfer_len = 0;
 213         pbuff_t b;
 214         unsigned int pipe = usb_rcvisocpipe (s->usbdev, _DABUSB_ISOPIPE);
 215         int pipesize = usb_maxpacket (s->usbdev, pipe, usb_pipeout (pipe));
 216         int packets = _ISOPIPESIZE / pipesize;
 217         int transfer_buffer_length = packets * pipesize;
 218         int i;
 219
 220         dbg("dabusb_alloc_buffers pipesize:%d packets:%d transfer_buffer_len:%d",
 221                  pipesize, packets, transfer_buffer_length);
 222
 223         while (transfer_len < (s->total_buffer_size << 10)) {
 224                 b = kzalloc(sizeof (buff_t), GFP_KERNEL);
 225                 if (!b) {
 226                         dev_err(&s->usbdev->dev,
 227                                 "kzalloc(sizeof(buff_t))==NULL\n");
 228                         goto err;
 229                 }
 230                 b->s = s;
 231                 b->purb = usb_alloc_urb(packets, GFP_KERNEL);
 232                 if (!b->purb) {
 233                         dev_err(&s->usbdev->dev, "usb_alloc_urb == NULL\n");
 234                         kfree (b);
 235                         goto err;
 236                 }
 237
 238                 b->purb->transfer_buffer = kmalloc (transfer_buffer_length, GFP_KERNEL);
 239                 if (!b->purb->transfer_buffer) {
 240                         kfree (b->purb);
 241                         kfree (b);
 242                         dev_err(&s->usbdev->dev,
 243                                 "kmalloc(%d)==NULL\n", transfer_buffer_length);
 244                         goto err;
 245                 }
 246
 247                 b->purb->transfer_buffer_length = transfer_buffer_length;
 248                 b->purb->number_of_packets = packets;
 249                 b->purb->complete = dabusb_iso_complete;
 250                 b->purb->context = b;
 251                 b->purb->dev = s->usbdev;
 252                 b->purb->pipe = pipe;
 253                 b->purb->transfer_flags = URB_ISO_ASAP;
 254
 255                 for (i = 0; i < packets; i++) {
 256                         b->purb->iso_frame_desc[i].offset = i * pipesize;
 257                         b->purb->iso_frame_desc[i].length = pipesize;
 258                 }
 259
 260                 transfer_len += transfer_buffer_length;
 261                 list_add_tail (&b->buff_list, &s->free_buff_list);
 262         }
 263         s->got_mem = transfer_len;
 264
 265         return 0;
 266
 267         err:
 268         dabusb_free_buffers (s);
 269         return -ENOMEM;
 270 }
 271 /*-------------------------------------------------------------------*/
 272 static int dabusb_bulk (pdabusb_t s, pbulk_transfer_t pb)
 273 {
 274         int ret;
 275         unsigned int pipe;
 276         int actual_length;
 277
 278         dbg("dabusb_bulk");
 279
 280         if (!pb->pipe)
 281                 pipe = usb_rcvbulkpipe (s->usbdev, 2);
 282         else
 283                 pipe = usb_sndbulkpipe (s->usbdev, 2);
 284
 285         ret=usb_bulk_msg(s->usbdev, pipe, pb->data, pb->size, &actual_length, 100);
 286         if(ret<0) {
 287                 dev_err(&s->usbdev->dev,
 288                         "usb_bulk_msg failed(%d)\n", ret);
 289
 290                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
 291                         dev_err(&s->usbdev->dev, "set_interface failed\n");
 292                         return -EINVAL;
 293                 }
 294
 295         }
 296
 297         if( ret == -EPIPE ) {
 298                 dev_warn(&s->usbdev->dev, "CLEAR_FEATURE request to remove STALL condition.\n");
 299                 if(usb_clear_halt(s->usbdev, usb_pipeendpoint(pipe)))
 300                         dev_err(&s->usbdev->dev, "request failed\n");
 301         }
 302
 303         pb->size = actual_length;
 304         return ret;
 305 }
 306 /* --------------------------------------------------------------------- */
 307 static int dabusb_writemem (pdabusb_t s, int pos, const unsigned char *data,
 308                             int len)
 309 {
 310         int ret;
 311         unsigned char *transfer_buffer =  kmalloc (len, GFP_KERNEL);
 312
 313         if (!transfer_buffer) {
 314                 dev_err(&s->usbdev->dev,
 315                         "dabusb_writemem: kmalloc(%d) failed.\n", len);
 316                 return -ENOMEM;
 317         }
 318
 319         memcpy (transfer_buffer, data, len);
 320
 321         ret=usb_control_msg(s->usbdev, usb_sndctrlpipe( s->usbdev, 0 ), 0xa0, 0x40, pos, 0, transfer_buffer, len, 300);
 322
 323         kfree (transfer_buffer);
 324         return ret;
 325 }
 326 /* --------------------------------------------------------------------- */
 327 static int dabusb_8051_reset (pdabusb_t s, unsigned char reset_bit)
 328 {
 329         dbg("dabusb_8051_reset: %d",reset_bit);
 330         return dabusb_writemem (s, CPUCS_REG, &reset_bit, 1);
 331 }
 332 /* --------------------------------------------------------------------- */
 333 static int dabusb_loadmem (pdabusb_t s, const char *fname)
 334 {
 335         int ret;
 336         const struct ihex_binrec *rec;
 337         const struct firmware *fw;
 338
 339         dbg("Enter dabusb_loadmem (internal)");
 340
 341         ret = request_ihex_firmware(&fw, "dabusb/firmware.fw", &s->usbdev->dev);
 342         if (ret) {
 343                 dev_err(&s->usbdev->dev,
 344                         "Failed to load \"dabusb/firmware.fw\": %d\n", ret);
 345                 goto out;
 346         }
 347         ret = dabusb_8051_reset (s, 1);
 348
 349         for (rec = (const struct ihex_binrec *)fw->data; rec;
 350              rec = ihex_next_binrec(rec)) {
 351                 dbg("dabusb_writemem: %04X %p %d)", be32_to_cpu(rec->addr),
 352                     rec->data, be16_to_cpu(rec->len));
 353
 354                 ret = dabusb_writemem(s, be32_to_cpu(rec->addr), rec->data,
 355                                        be16_to_cpu(rec->len));
 356                 if (ret < 0) {
 357                         dev_err(&s->usbdev->dev,
 358                                 "dabusb_writemem failed (%d %04X %p %d)\n",
 359                                 ret, be32_to_cpu(rec->addr),
 360                                 rec->data, be16_to_cpu(rec->len));
 361                         break;
 362                 }
 363         }
 364         ret = dabusb_8051_reset (s, 0);
 365         release_firmware(fw);
 366  out:
 367         dbg("dabusb_loadmem: exit");
 368
 369         return ret;
 370 }
 371 /* --------------------------------------------------------------------- */
 372 static int dabusb_fpga_clear (pdabusb_t s, pbulk_transfer_t b)
 373 {
 374         b->size = 4;
 375         b->data[0] = 0x2a;
 376         b->data[1] = 0;
 377         b->data[2] = 0;
 378         b->data[3] = 0;
 379
 380         dbg("dabusb_fpga_clear");
 381
 382         return dabusb_bulk (s, b);
 383 }
 384 /* --------------------------------------------------------------------- */
 385 static int dabusb_fpga_init (pdabusb_t s, pbulk_transfer_t b)
 386 {
 387         b->size = 4;
 388         b->data[0] = 0x2c;
 389         b->data[1] = 0;
 390         b->data[2] = 0;
 391         b->data[3] = 0;
 392
 393         dbg("dabusb_fpga_init");
 394
 395         return dabusb_bulk (s, b);
 396 }
 397 /* --------------------------------------------------------------------- */
 398 static int dabusb_fpga_download (pdabusb_t s, const char *fname)
 399 {
 400         pbulk_transfer_t b = kmalloc (sizeof (bulk_transfer_t), GFP_KERNEL);
 401         const struct firmware *fw;
 402         unsigned int blen, n;
 403         int ret;
 404
 405         dbg("Enter dabusb_fpga_download (internal)");
 406
 407         if (!b) {
 408                 dev_err(&s->usbdev->dev,
 409                         "kmalloc(sizeof(bulk_transfer_t))==NULL\n");
 410                 return -ENOMEM;
 411         }
 412
 413         ret = request_firmware(&fw, "dabusb/bitstream.bin", &s->usbdev->dev);
 414         if (ret) {
 415                 dev_err(&s->usbdev->dev,
 416                         "Failed to load \"dabusb/bitstream.bin\": %d\n", ret);
 417                 kfree(b);
 418                 return ret;
 419         }
 420
 421         b->pipe = 1;
 422         ret = dabusb_fpga_clear (s, b);
 423         mdelay (10);
 424         blen = fw->data[73] + (fw->data[72] << 8);
 425
 426         dbg("Bitstream len: %i", blen);
 427
 428         b->data[0] = 0x2b;
 429         b->data[1] = 0;
 430         b->data[2] = 0;
 431         b->data[3] = 60;
 432
 433         for (n = 0; n <= blen + 60; n += 60) {
 434                 // some cclks for startup
 435                 b->size = 64;
 436                 memcpy (b->data + 4, fw->data + 74 + n, 60);
 437                 ret = dabusb_bulk (s, b);
 438                 if (ret < 0) {
 439                         dev_err(&s->usbdev->dev, "dabusb_bulk failed.\n");
 440                         break;
 441                 }
 442                 mdelay (1);
 443         }
 444
 445         ret = dabusb_fpga_init (s, b);
 446         kfree (b);
 447         release_firmware(fw);
 448
 449         dbg("exit dabusb_fpga_download");
 450
 451         return ret;
 452 }
 453
 454 static int dabusb_stop (pdabusb_t s)
 455 {
 456         dbg("dabusb_stop");
 457
 458         s->state = _stopped;
 459         dabusb_cancel_queue (s, &s->rec_buff_list);
 460
 461         dbg("pending_io: %d", s->pending_io.counter);
 462
 463         s->pending_io.counter = 0;
 464         return 0;
 465 }
 466
 467 static int dabusb_startrek (pdabusb_t s)
 468 {
 469         if (!s->got_mem && s->state != _started) {
 470
 471                 dbg("dabusb_startrek");
 472
 473                 if (dabusb_alloc_buffers (s) < 0)
 474                         return -ENOMEM;
 475                 dabusb_stop (s);
 476                 s->state = _started;
 477                 s->readptr = 0;
 478         }
 479
 480         if (!list_empty (&s->free_buff_list)) {
 481                 pbuff_t end;
 482                 int ret;
 483
 484         while (!dabusb_add_buf_tail (s, &s->rec_buff_list, &s->free_buff_list)) {
 485
 486                         dbg("submitting: end:%p s->rec_buff_list:%p", s->rec_buff_list.prev, &s->rec_buff_list);
 487
 488                         end = list_entry (s->rec_buff_list.prev, buff_t, buff_list);
 489
 490                         ret = usb_submit_urb (end->purb, GFP_KERNEL);
 491                         if (ret) {
 492                                 dev_err(&s->usbdev->dev,
 493                                         "usb_submit_urb returned:%d\n", ret);
 494                                 if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
 495                                         dev_err(&s->usbdev->dev,
 496                                                 "startrek: dabusb_add_buf_tail failed\n");
 497                                 break;
 498                         }
 499                         else
 500                                 atomic_inc (&s->pending_io);
 501                 }
 502                 dbg("pending_io: %d",s->pending_io.counter);
 503         }
 504
 505         return 0;
 506 }
 507
 508 static ssize_t dabusb_read (struct file *file, char __user *buf, size_t count, loff_t * ppos)
 509 {
 510         pdabusb_t s = (pdabusb_t) file->private_data;
 511         unsigned long flags;
 512         unsigned ret = 0;
 513         int rem;
 514         int cnt;
 515         pbuff_t b;
 516         struct urb *purb = NULL;
 517
 518         dbg("dabusb_read");
 519
 520         if (*ppos)
 521                 return -ESPIPE;
 522
 523         if (s->remove_pending)
 524                 return -EIO;
 525
 526
 527         if (!s->usbdev)
 528                 return -EIO;
 529
 530         while (count > 0) {
 531                 dabusb_startrek (s);
 532
 533                 spin_lock_irqsave (&s->lock, flags);
 534
 535                 if (list_empty (&s->rec_buff_list)) {
 536
 537                         spin_unlock_irqrestore(&s->lock, flags);
 538
 539                         dev_err(&s->usbdev->dev,
 540                                 "error: rec_buf_list is empty\n");
 541                         goto err;
 542                 }
 543
 544                 b = list_entry (s->rec_buff_list.next, buff_t, buff_list);
 545                 purb = b->purb;
 546
 547                 spin_unlock_irqrestore(&s->lock, flags);
 548
 549                 if (purb->status == -EINPROGRESS) {
 550                         if (file->f_flags & O_NONBLOCK)         // return nonblocking
 551                          {
 552                                 if (!ret)
 553                                         ret = -EAGAIN;
 554                                 goto err;
 555                         }
 556
 557                         interruptible_sleep_on (&s->wait);
 558
 559                         if (signal_pending (current)) {
 560                                 if (!ret)
 561                                         ret = -ERESTARTSYS;
 562                                 goto err;
 563                         }
 564
 565                         spin_lock_irqsave (&s->lock, flags);
 566
 567                         if (list_empty (&s->rec_buff_list)) {
 568                                 spin_unlock_irqrestore(&s->lock, flags);
 569                                 dev_err(&s->usbdev->dev,
 570                                         "error: still no buffer available.\n");
 571                                 goto err;
 572                         }
 573                         spin_unlock_irqrestore(&s->lock, flags);
 574                         s->readptr = 0;
 575                 }
 576                 if (s->remove_pending) {
 577                         ret = -EIO;
 578                         goto err;
 579                 }
 580
 581                 rem = purb->actual_length - s->readptr;         // set remaining bytes to copy
 582
 583                 if (count >= rem)
 584                         cnt = rem;
 585                 else
 586                         cnt = count;
 587
 588                 dbg("copy_to_user:%p %p %d",buf, purb->transfer_buffer + s->readptr, cnt);
 589
 590                 if (copy_to_user (buf, purb->transfer_buffer + s->readptr, cnt)) {
 591                         dev_err(&s->usbdev->dev, "read: copy_to_user failed\n");
 592                         if (!ret)
 593                                 ret = -EFAULT;
 594                         goto err;
 595                 }
 596
 597                 s->readptr += cnt;
 598                 count -= cnt;
 599                 buf += cnt;
 600                 ret += cnt;
 601
 602                 if (s->readptr == purb->actual_length) {
 603                         // finished, take next buffer
 604                         if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
 605                                 dev_err(&s->usbdev->dev,
 606                                         "read: dabusb_add_buf_tail failed\n");
 607                         s->readptr = 0;
 608                 }
 609         }
 610       err:                      //mutex_unlock(&s->mutex);
 611         return ret;
 612 }
 613
 614 static int dabusb_open (struct inode *inode, struct file *file)
 615 {
 616         int devnum = iminor(inode);
 617         pdabusb_t s;
 618
 619         if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
 620                 return -EIO;
 621
 622         s = &dabusb[devnum - DABUSB_MINOR];
 623
 624         dbg("dabusb_open");
 625         mutex_lock(&s->mutex);
 626
 627         while (!s->usbdev || s->opened) {
 628                 mutex_unlock(&s->mutex);
 629
 630                 if (file->f_flags & O_NONBLOCK) {
 631                         return -EBUSY;
 632                 }
 633                 msleep_interruptible(500);
 634
 635                 if (signal_pending (current)) {
 636                         return -EAGAIN;
 637                 }
 638                 mutex_lock(&s->mutex);
 639         }
 640         if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
 641                 mutex_unlock(&s->mutex);
 642                 dev_err(&s->usbdev->dev, "set_interface failed\n");
 643                 return -EINVAL;
 644         }
 645         s->opened = 1;
 646         mutex_unlock(&s->mutex);
 647
 648         file->f_pos = 0;
 649         file->private_data = s;
 650
 651         return nonseekable_open(inode, file);
 652 }
 653
 654 static int dabusb_release (struct inode *inode, struct file *file)
 655 {
 656         pdabusb_t s = (pdabusb_t) file->private_data;
 657
 658         dbg("dabusb_release");
 659
 660         mutex_lock(&s->mutex);
 661         dabusb_stop (s);
 662         dabusb_free_buffers (s);
 663         mutex_unlock(&s->mutex);
 664
 665         if (!s->remove_pending) {
 666                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0)
 667                         dev_err(&s->usbdev->dev, "set_interface failed\n");
 668         }
 669         else
 670                 wake_up (&s->remove_ok);
 671
 672         s->opened = 0;
 673         return 0;
 674 }
 675
 676 static int dabusb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 677 {
 678         pdabusb_t s = (pdabusb_t) file->private_data;
 679         pbulk_transfer_t pbulk;
 680         int ret = 0;
 681         int version = DABUSB_VERSION;
 682
 683         dbg("dabusb_ioctl");
 684
 685         if (s->remove_pending)
 686                 return -EIO;
 687
 688         mutex_lock(&s->mutex);
 689
 690         if (!s->usbdev) {
 691                 mutex_unlock(&s->mutex);
 692                 return -EIO;
 693         }
 694
 695         switch (cmd) {
 696
 697         case IOCTL_DAB_BULK:
 698                 pbulk = kmalloc(sizeof (bulk_transfer_t), GFP_KERNEL);
 699
 700                 if (!pbulk) {
 701                         ret = -ENOMEM;
 702                         break;
 703                 }
 704
 705                 if (copy_from_user (pbulk, (void __user *) arg, sizeof (bulk_transfer_t))) {
 706                         ret = -EFAULT;
 707                         kfree (pbulk);
 708                         break;
 709                 }
 710
 711                 ret=dabusb_bulk (s, pbulk);
 712                 if(ret==0)
 713                         if (copy_to_user((void __user *)arg, pbulk,
 714                                          sizeof(bulk_transfer_t)))
 715                                 ret = -EFAULT;
 716                 kfree (pbulk);
 717                 break;
 718
 719         case IOCTL_DAB_OVERRUNS:
 720                 ret = put_user (s->overruns, (unsigned int __user *) arg);
 721                 break;
 722
 723         case IOCTL_DAB_VERSION:
 724                 ret = put_user (version, (unsigned int __user *) arg);
 725                 break;
 726
 727         default:
 728                 ret = -ENOIOCTLCMD;
 729                 break;
 730         }
 731         mutex_unlock(&s->mutex);
 732         return ret;
 733 }
 734
 735 static const struct file_operations dabusb_fops =
 736 {
 737         .owner =        THIS_MODULE,
 738         .llseek =       no_llseek,
 739         .read =         dabusb_read,
 740         .ioctl =        dabusb_ioctl,
 741         .open =         dabusb_open,
 742         .release =      dabusb_release,
 743 };
 744
 745 static struct usb_class_driver dabusb_class = {
 746         .name =         "dabusb%d",
 747         .fops =         &dabusb_fops,
 748         .minor_base =   DABUSB_MINOR,
 749 };
 750
 751
 752 /* --------------------------------------------------------------------- */
 753 static int dabusb_probe (struct usb_interface *intf,
 754                          const struct usb_device_id *id)
 755 {
 756         struct usb_device *usbdev = interface_to_usbdev(intf);
 757         int retval;
 758         pdabusb_t s;
 759
 760         dbg("dabusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d",
 761             le16_to_cpu(usbdev->descriptor.idVendor),
 762             le16_to_cpu(usbdev->descriptor.idProduct),
 763             intf->altsetting->desc.bInterfaceNumber);
 764
 765         /* We don't handle multiple configurations */
 766         if (usbdev->descriptor.bNumConfigurations != 1)
 767                 return -ENODEV;
 768
 769         if (intf->altsetting->desc.bInterfaceNumber != _DABUSB_IF &&
 770             le16_to_cpu(usbdev->descriptor.idProduct) == 0x9999)
 771                 return -ENODEV;
 772
 773
 774
 775         s = &dabusb[intf->minor];
 776
 777         mutex_lock(&s->mutex);
 778         s->remove_pending = 0;
 779         s->usbdev = usbdev;
 780         s->devnum = intf->minor;
 781
 782         if (usb_reset_configuration (usbdev) < 0) {
 783                 dev_err(&intf->dev, "reset_configuration failed\n");
 784                 goto reject;
 785         }
 786         if (le16_to_cpu(usbdev->descriptor.idProduct) == 0x2131) {
 787                 dabusb_loadmem (s, NULL);
 788                 goto reject;
 789         }
 790         else {
 791                 dabusb_fpga_download (s, NULL);
 792
 793                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0) {
 794                         dev_err(&intf->dev, "set_interface failed\n");
 795                         goto reject;
 796                 }
 797         }
 798         dbg("bound to interface: %d", intf->altsetting->desc.bInterfaceNumber);
 799         usb_set_intfdata (intf, s);
 800         mutex_unlock(&s->mutex);
 801
 802         retval = usb_register_dev(intf, &dabusb_class);
 803         if (retval) {
 804                 usb_set_intfdata (intf, NULL);
 805                 return -ENOMEM;
 806         }
 807
 808         return 0;
 809
 810       reject:
 811         mutex_unlock(&s->mutex);
 812         s->usbdev = NULL;
 813         return -ENODEV;
 814 }
 815
 816 static void dabusb_disconnect (struct usb_interface *intf)
 817 {
 818         wait_queue_t __wait;
 819         pdabusb_t s = usb_get_intfdata (intf);
 820
 821         dbg("dabusb_disconnect");
 822
 823         init_waitqueue_entry(&__wait, current);
 824
 825         usb_set_intfdata (intf, NULL);
 826         if (s) {
 827                 usb_deregister_dev (intf, &dabusb_class);
 828                 s->remove_pending = 1;
 829                 wake_up (&s->wait);
 830                 add_wait_queue(&s->remove_ok, &__wait);
 831                 set_current_state(TASK_UNINTERRUPTIBLE);
 832                 if (s->state == _started)
 833                         schedule();
 834                 current->state = TASK_RUNNING;
 835                 remove_wait_queue(&s->remove_ok, &__wait);
 836
 837                 s->usbdev = NULL;
 838                 s->overruns = 0;
 839         }
 840 }
 841
 842 static struct usb_device_id dabusb_ids [] = {
 843         // { USB_DEVICE(0x0547, 0x2131) },      /* An2131 chip, no boot ROM */
 844         { USB_DEVICE(0x0547, 0x9999) },
 845         { }                                             /* Terminating entry */
 846 };
 847
 848 MODULE_DEVICE_TABLE (usb, dabusb_ids);
 849
 850 static struct usb_driver dabusb_driver = {
 851         .name =         "dabusb",
 852         .probe =        dabusb_probe,
 853         .disconnect =   dabusb_disconnect,
 854         .id_table =     dabusb_ids,
 855 };
 856
 857 /* --------------------------------------------------------------------- */
 858
 859 static int __init dabusb_init (void)
 860 {
 861         int retval;
 862         unsigned u;
 863
 864         /* initialize struct */
 865         for (u = 0; u < NRDABUSB; u++) {
 866                 pdabusb_t s = &dabusb[u];
 867                 memset (s, 0, sizeof (dabusb_t));
 868                 mutex_init (&s->mutex);
 869                 s->usbdev = NULL;
 870                 s->total_buffer_size = buffers;
 871                 init_waitqueue_head (&s->wait);
 872                 init_waitqueue_head (&s->remove_ok);
 873                 spin_lock_init (&s->lock);
 874                 INIT_LIST_HEAD (&s->free_buff_list);
 875                 INIT_LIST_HEAD (&s->rec_buff_list);
 876         }
 877
 878         /* register misc device */
 879         retval = usb_register(&dabusb_driver);
 880         if (retval)
 881                 goto out;
 882
 883         dbg("dabusb_init: driver registered");
 884
 885         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 886                DRIVER_DESC "\n");
 887
 888 out:
 889         return retval;
 890 }
 891
 892 static void __exit dabusb_cleanup (void)
 893 {
 894         dbg("dabusb_cleanup");
 895
 896         usb_deregister (&dabusb_driver);
 897 }
 898
 899 /* --------------------------------------------------------------------- */
 900
 901 MODULE_AUTHOR( DRIVER_AUTHOR );
 902 MODULE_DESCRIPTION( DRIVER_DESC );
 903 MODULE_LICENSE("GPL");
 904
 905 module_param(buffers, int, 0);
 906 MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
 907
 908 module_init (dabusb_init);
 909 module_exit (dabusb_cleanup);
 910
 911 /* --------------------------------------------------------------------- */