1 /* 2 * DVB USB framework 3 * 4 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@desy.de> 5 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 20 */ 21 22 #include "dvb_usb_common.h" 23 24 int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf, 25 u16 rlen) 26 { 27 int ret, actual_length; 28 29 if (!d || !wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint || 30 !d->props->generic_bulk_ctrl_endpoint_response) { 31 dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL); 32 return -EINVAL; 33 } 34 35 ret = mutex_lock_interruptible(&d->usb_mutex); 36 if (ret < 0) 37 return ret; 38 39 dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf); 40 41 ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev, 42 d->props->generic_bulk_ctrl_endpoint), wbuf, wlen, 43 &actual_length, 2000); 44 if (ret < 0) 45 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n", 46 KBUILD_MODNAME, ret); 47 else 48 ret = actual_length != wlen ? -EIO : 0; 49 50 /* an answer is expected, and no error before */ 51 if (!ret && rbuf && rlen) { 52 if (d->props->generic_bulk_ctrl_delay) 53 usleep_range(d->props->generic_bulk_ctrl_delay, 54 d->props->generic_bulk_ctrl_delay 55 + 20000); 56 57 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev, 58 d->props->generic_bulk_ctrl_endpoint_response), 59 rbuf, rlen, &actual_length, 2000); 60 if (ret) 61 dev_err(&d->udev->dev, "%s: 2nd usb_bulk_msg() " \ 62 "failed=%d\n", KBUILD_MODNAME, ret); 63 64 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__, 65 actual_length, rbuf); 66 } 67 68 mutex_unlock(&d->usb_mutex); 69 return ret; 70 } 71 EXPORT_SYMBOL(dvb_usbv2_generic_rw); 72 73 int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len) 74 { 75 return dvb_usbv2_generic_rw(d, buf, len, NULL, 0); 76 } 77 EXPORT_SYMBOL(dvb_usbv2_generic_write); 78