diff options
Diffstat (limited to 'drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c b/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c new file mode 100644 index 000000000000..0431beed0ef4 --- /dev/null +++ b/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c @@ -0,0 +1,77 @@ +/* + * DVB USB framework + * + * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@desy.de> + * Copyright (C) 2012 Antti Palosaari <crope@iki.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "dvb_usb_common.h" + +int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf, + u16 rlen) +{ + int ret, actual_length; + + if (!d || !wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint || + !d->props->generic_bulk_ctrl_endpoint_response) { + dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL); + return -EINVAL; + } + + ret = mutex_lock_interruptible(&d->usb_mutex); + if (ret < 0) + return ret; + + dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf); + + ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev, + d->props->generic_bulk_ctrl_endpoint), wbuf, wlen, + &actual_length, 2000); + if (ret < 0) + dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n", + KBUILD_MODNAME, ret); + else + ret = actual_length != wlen ? -EIO : 0; + + /* an answer is expected, and no error before */ + if (!ret && rbuf && rlen) { + if (d->props->generic_bulk_ctrl_delay) + usleep_range(d->props->generic_bulk_ctrl_delay, + d->props->generic_bulk_ctrl_delay + + 20000); + + ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev, + d->props->generic_bulk_ctrl_endpoint_response), + rbuf, rlen, &actual_length, 2000); + if (ret) + dev_err(&d->udev->dev, "%s: 2nd usb_bulk_msg() " \ + "failed=%d\n", KBUILD_MODNAME, ret); + + dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__, + actual_length, rbuf); + } + + mutex_unlock(&d->usb_mutex); + return ret; +} +EXPORT_SYMBOL(dvb_usbv2_generic_rw); + +int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len) +{ + return dvb_usbv2_generic_rw(d, buf, len, NULL, 0); +} +EXPORT_SYMBOL(dvb_usbv2_generic_write); |