source: mainline/uspace/lib/usbdev/include/usb/dev/usb_device_connection.h@ 1845003

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/** @addtogroup libusbdev
 * @{
 */
/** @file
 * Common USB types and functions.
 */
#ifndef LIBUSBDEV_DEVICE_CONNECTION_H_
#define LIBUSBDEV_DEVICE_CONNECTION_H_

#include <errno.h>
#include <devman.h>
#include <usb/usb.h>
#include <usb/hc.h>


/** Abstraction of a physical connection to the device.
 * This type is an abstraction of the USB wire that connects the host and
 * the function (device).
 */
typedef struct {
        /** Connection to the host controller device is connected to. */
        usb_hc_connection_t *hc_connection;
        /** Address of the device. */
        usb_address_t address;
} usb_device_connection_t;

/** Initialize device connection. Set address and hc connection.
 * @param instance Structure to initialize.
 * @param hc_connection. Host controller connection to use.
 * @param address USB address.
 * @return Error code.
 */
static inline int usb_device_connection_initialize(
    usb_device_connection_t *instance, usb_hc_connection_t *hc_connection,
    usb_address_t address)
{
        assert(instance);
        if (hc_connection == NULL)
                return EBADMEM;
        if (!usb_address_is_valid(address))
                return EINVAL;

        instance->hc_connection = hc_connection;
        instance->address = address;
        return EOK;
}


/** Get data from the device.
 * @param[in] instance device connection structure to use.
 * @param[in] ep target endpoint's number.
 * @param[in] setup Setup stage data (control transfers).
 * @param[in] data data buffer.
 * @param[in] size size of the data buffer.
 * @param[out] rsize bytes actually copied to the buffer.
 * @return Error code.
 */
static inline int usb_device_control_read(usb_device_connection_t *instance,
    usb_endpoint_t ep, uint64_t setup, void *data, size_t size, size_t *rsize)
{
        assert(instance);
        return usb_hc_read(instance->hc_connection,
            instance->address, ep, setup, data, size, rsize);
}

/** Send data to the device.
 * @param instance device connection structure to use.
 * @param ep target endpoint's number.
 * @param setup Setup stage data (control transfers).
 * @param data data buffer.
 * @param size size of the data buffer.
 * @return Error code.
 */
static inline int usb_device_control_write(usb_device_connection_t *instance,
    usb_endpoint_t ep, uint64_t setup, const void *data, size_t size)
{
        assert(instance);
        return usb_hc_write(instance->hc_connection,
            instance->address, ep, setup, data, size);
}

/** Wrapper for read calls with no setup stage.
 * @param[in] instance device connection structure.
 * @param[in] address USB device address.
 * @param[in] endpoint USB device endpoint.
 * @param[in] data Data buffer.
 * @param[in] size Size of the buffer.
 * @param[out] real_size Size of the transferred data.
 * @return Error code.
 */
static inline int usb_device_read(usb_device_connection_t *instance,
    usb_endpoint_t ep, void *data, size_t size, size_t *real_size)
{
        return usb_device_control_read(instance, ep, 0, data, size, real_size);
}

/** Wrapper for write calls with no setup stage.
 * @param instance device connection structure.
 * @param address USB device address.
 * @param endpoint USB device endpoint.
 * @param data Data buffer.
 * @param size Size of the buffer.
 * @return Error code.
 */
static inline int usb_device_write(usb_device_connection_t *instance,
    usb_endpoint_t ep, const void *data, size_t size)
{
        return usb_device_control_write(instance, ep, 0, data, size);
}
#endif
/**
 * @}
 */