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 static int dvb_usb_v2_generic_io(struct dvb_usb_device *d, 25 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 26 { 27 int ret, actual_length; 28 29 if (!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 dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf); 36 37 ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev, 38 d->props->generic_bulk_ctrl_endpoint), wbuf, wlen, 39 &actual_length, 2000); 40 if (ret < 0) 41 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n", 42 KBUILD_MODNAME, ret); 43 else 44 ret = actual_length != wlen ? -EIO : 0; 45 46 /* an answer is expected, and no error before */ 47 if (!ret && rbuf && rlen) { 48 if (d->props->generic_bulk_ctrl_delay) 49 usleep_range(d->props->generic_bulk_ctrl_delay, 50 d->props->generic_bulk_ctrl_delay 51 + 20000); 52 53 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev, 54 d->props->generic_bulk_ctrl_endpoint_response), 55 rbuf, rlen, &actual_length, 2000); 56 if (ret) 57 dev_err(&d->udev->dev, 58 "%s: 2nd usb_bulk_msg() failed=%d\n", 59 KBUILD_MODNAME, ret); 60 61 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__, 62 actual_length, rbuf); 63 } 64 65 return ret; 66 } 67 68 int dvb_usbv2_generic_rw(struct dvb_usb_device *d, 69 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 70 { 71 int ret; 72 73 mutex_lock(&d->usb_mutex); 74 ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen); 75 mutex_unlock(&d->usb_mutex); 76 77 return ret; 78 } 79 EXPORT_SYMBOL(dvb_usbv2_generic_rw); 80 81 int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len) 82 { 83 int ret; 84 85 mutex_lock(&d->usb_mutex); 86 ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0); 87 mutex_unlock(&d->usb_mutex); 88 89 return ret; 90 } 91 EXPORT_SYMBOL(dvb_usbv2_generic_write); 92 93 int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d, 94 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 95 { 96 return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen); 97 } 98 EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked); 99 100 int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len) 101 { 102 return dvb_usb_v2_generic_io(d, buf, len, NULL, 0); 103 } 104 EXPORT_SYMBOL(dvb_usbv2_generic_write_locked); 105