1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * DVB USB framework 4 * 5 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.de> 6 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi> 7 */ 8 9 #include "dvb_usb_common.h" 10 11 static int dvb_usb_v2_generic_io(struct dvb_usb_device *d, 12 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 13 { 14 int ret, actual_length; 15 16 if (!wbuf || !wlen || !d->props->generic_bulk_ctrl_endpoint || 17 !d->props->generic_bulk_ctrl_endpoint_response) { 18 dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, -EINVAL); 19 return -EINVAL; 20 } 21 22 dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf); 23 24 ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev, 25 d->props->generic_bulk_ctrl_endpoint), wbuf, wlen, 26 &actual_length, 2000); 27 if (ret) { 28 dev_err(&d->udev->dev, "%s: usb_bulk_msg() failed=%d\n", 29 KBUILD_MODNAME, ret); 30 return ret; 31 } 32 if (actual_length != wlen) { 33 dev_err(&d->udev->dev, "%s: usb_bulk_msg() write length=%d, actual=%d\n", 34 KBUILD_MODNAME, wlen, actual_length); 35 return -EIO; 36 } 37 38 /* an answer is expected */ 39 if (rbuf && rlen) { 40 if (d->props->generic_bulk_ctrl_delay) 41 usleep_range(d->props->generic_bulk_ctrl_delay, 42 d->props->generic_bulk_ctrl_delay 43 + 20000); 44 45 ret = usb_bulk_msg(d->udev, usb_rcvbulkpipe(d->udev, 46 d->props->generic_bulk_ctrl_endpoint_response), 47 rbuf, rlen, &actual_length, 2000); 48 if (ret) 49 dev_err(&d->udev->dev, 50 "%s: 2nd usb_bulk_msg() failed=%d\n", 51 KBUILD_MODNAME, ret); 52 53 dev_dbg(&d->udev->dev, "%s: <<< %*ph\n", __func__, 54 actual_length, rbuf); 55 } 56 57 return ret; 58 } 59 60 int dvb_usbv2_generic_rw(struct dvb_usb_device *d, 61 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 62 { 63 int ret; 64 65 mutex_lock(&d->usb_mutex); 66 ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen); 67 mutex_unlock(&d->usb_mutex); 68 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 int ret; 76 77 mutex_lock(&d->usb_mutex); 78 ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0); 79 mutex_unlock(&d->usb_mutex); 80 81 return ret; 82 } 83 EXPORT_SYMBOL(dvb_usbv2_generic_write); 84 85 int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d, 86 u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen) 87 { 88 return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen); 89 } 90 EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked); 91 92 int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len) 93 { 94 return dvb_usb_v2_generic_io(d, buf, len, NULL, 0); 95 } 96 EXPORT_SYMBOL(dvb_usbv2_generic_write_locked); 97