drivers/media/dvb/dvb-usb/dvb_usb_urb.c

   1 /* dvb-usb-urb.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file keeps functions for initializing and handling the
   7  * USB and URB stuff.
   8  */
   9 #include "dvb_usb_common.h"
  10
  11 int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
  12         u16 rlen, int delay_ms)
  13 {
  14         int actlen, ret = -ENOMEM;
  15
  16         if (!d || wbuf == NULL || wlen == 0)
  17                 return -EINVAL;
  18
  19         if (d->props.generic_bulk_ctrl_endpoint == 0) {
  20                 pr_err("%s: endpoint for generic control not specified",
  21                                 KBUILD_MODNAME);
  22                 return -EINVAL;
  23         }
  24
  25         ret = mutex_lock_interruptible(&d->usb_mutex);
  26         if (ret)
  27                 return ret;
  28
  29         print_hex_dump(KERN_DEBUG, KBUILD_MODNAME ": >>> ", DUMP_PREFIX_NONE,
  30                         32, 1, wbuf, wlen, 0);
  31
  32         ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
  33                         d->props.generic_bulk_ctrl_endpoint), wbuf, wlen,
  34                         &actlen, 2000);
  35
  36         if (ret)
  37                 pr_err("%s: bulk message failed: %d (%d/%d)", KBUILD_MODNAME,
  38                                 ret, wlen, actlen);
  39         else
  40                 ret = actlen != wlen ? -1 : 0;
  41
  42         /* an answer is expected, and no error before */
  43         if (!ret && rbuf && rlen) {
  44                 if (delay_ms)
  45                         msleep(delay_ms);
  46
  47                 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev,
  48                                 d->props.generic_bulk_ctrl_endpoint_response ?
  49                                 d->props.generic_bulk_ctrl_endpoint_response :
  50                                 d->props.generic_bulk_ctrl_endpoint),
  51                                 rbuf, rlen, &actlen, 2000);
  52
  53                 if (ret)
  54                         pr_err("%s: recv bulk message failed: %d",
  55                                         KBUILD_MODNAME, ret);
  56                 else
  57                         print_hex_dump(KERN_DEBUG, KBUILD_MODNAME ": <<< ",
  58                                         DUMP_PREFIX_NONE, 32, 1, wbuf, wlen, 0);
  59         }
  60
  61         mutex_unlock(&d->usb_mutex);
  62         return ret;
  63 }
  64 EXPORT_SYMBOL(dvb_usbv2_generic_rw);
  65
  66 int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
  67 {
  68         return dvb_usbv2_generic_rw(d, buf, len, NULL, 0, 0);
  69 }
  70 EXPORT_SYMBOL(dvb_usbv2_generic_write);