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/*
* This file is part of the libjaylink project.
*
* Copyright (C) 2014-2015 Marc Schink <jaylink-dev@marcschink.de>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "libjaylink.h"
#include "libjaylink-internal.h"
/**
* @file
*
* Transport abstraction layer.
*/
/**
* Open a device.
*
* This function must be called before any other function of the transport
* abstraction layer for the given device handle is called.
*
* @param[in,out] devh Device handle.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR Other error conditions.
*/
JAYLINK_PRIV int transport_open(struct jaylink_device_handle *devh)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_open(devh);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_open(devh);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Close a device.
*
* After this function has been called no other function of the transport
* abstraction layer for the given device handle must be called.
*
* @param[in,out] devh Device handle.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR Other error conditions.
*/
JAYLINK_PRIV int transport_close(struct jaylink_device_handle *devh)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_close(devh);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_close(devh);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Start a write operation for a device.
*
* The data of a write operation must be written with at least one call of
* transport_write(). It is required that all data of a write operation is
* written before an other write and/or read operation is started.
*
* @param[in,out] devh Device handle.
* @param[in] length Number of bytes of the write operation.
* @param[in] has_command Determines whether the data of the write operation
* contains the protocol command.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
*/
JAYLINK_PRIV int transport_start_write(struct jaylink_device_handle *devh,
size_t length, bool has_command)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_start_write(devh, length, has_command);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_start_write(devh, length, has_command);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Start a read operation for a device.
*
* The data of a read operation must be read with at least one call of
* transport_read(). It is required that all data of a read operation is read
* before an other write and/or read operation is started.
*
* @param[in,out] devh Device handle.
* @param[in] length Number of bytes of the read operation.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
*/
JAYLINK_PRIV int transport_start_read(struct jaylink_device_handle *devh,
size_t length)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_start_read(devh, length);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_start_read(devh, length);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Start a write and read operation for a device.
*
* This function starts a write and read operation as the consecutive call of
* transport_start_write() and transport_start_read() but has a different
* meaning from the protocol perspective and can therefore not be replaced by
* these functions and vice versa.
*
* @note The write operation must be completed first before the read operation
* must be processed.
*
* @param[in,out] devh Device handle.
* @param[in] write_length Number of bytes of the write operation.
* @param[in] read_length Number of bytes of the read operation.
* @param[in] has_command Determines whether the data of the write operation
* contains the protocol command.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
*/
JAYLINK_PRIV int transport_start_write_read(struct jaylink_device_handle *devh,
size_t write_length, size_t read_length, bool has_command)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_start_write_read(devh, write_length,
read_length, has_command);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_start_write_read(devh, write_length,
read_length, has_command);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Write data to a device.
*
* Before this function is used transport_start_write() or
* transport_start_write_read() must be called to start a write operation. The
* total number of written bytes must not exceed the number of bytes of the
* write operation.
*
* @note A write operation will be performed and the data will be sent to the
* device when the number of written bytes reaches the number of bytes of
* the write operation. Before that the data will be written into a
* buffer.
*
* @param[in,out] devh Device handle.
* @param[in] buffer Buffer to write data from.
* @param[in] length Number of bytes to write.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR Other error conditions.
*/
JAYLINK_PRIV int transport_write(struct jaylink_device_handle *devh,
const uint8_t *buffer, size_t length)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_write(devh, buffer, length);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_write(devh, buffer, length);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
/**
* Read data from a device.
*
* Before this function is used transport_start_read() or
* transport_start_write_read() must be called to start a read operation. The
* total number of read bytes must not exceed the number of bytes of the read
* operation.
*
* @param[in,out] devh Device handle.
* @param[out] buffer Buffer to read data into on success. Its content is
* undefined on failure.
* @param[in] length Number of bytes to read.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR Other error conditions.
*/
JAYLINK_PRIV int transport_read(struct jaylink_device_handle *devh,
uint8_t *buffer, size_t length)
{
int ret;
switch (devh->dev->iface) {
#ifdef HAVE_LIBUSB
case JAYLINK_HIF_USB:
ret = transport_usb_read(devh, buffer, length);
break;
#endif
case JAYLINK_HIF_TCP:
ret = transport_tcp_read(devh, buffer, length);
break;
default:
log_err(devh->dev->ctx, "BUG: Invalid host interface: %u",
devh->dev->iface);
return JAYLINK_ERR;
}
return ret;
}
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