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