source: mainline/uspace/lib/usbdev/src/pipesio.c@ a045ab1

/*
 * Copyright (c) 2011 Vojtech Horky
 * 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
 * Input and output functions (reads and writes) on endpoint pipes.
 *
 * Note on synchronousness of the operations: there is ABSOLUTELY NO
 * guarantee that a call to particular function will not trigger a fibril
 * switch.
 *
 * Note about the implementation: the transfer requests are always divided
 * into two functions.
 * The outer one does checking of input parameters (e.g. that session was
 * already started, buffers are not NULL etc), while the inner one
 * (with _no_checks suffix) does the actual IPC (it checks for IPC errors,
 * obviously).
 */

#include <usb/usb.h>
#include <usb/dev/pipes.h>
#include <errno.h>
#include <assert.h>
#include <usbhc_iface.h>
#include <usb/dev/request.h>
#include <async.h>
#include "pipepriv.h"

/** Request an in transfer, no checking of input parameters.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[out] buffer Buffer where to store the data.
 * @param[in] size Size of the buffer (in bytes).
 * @param[out] size_transfered Number of bytes that were actually transfered.
 * @return Error code.
 */
static int usb_pipe_read_no_check(usb_pipe_t *pipe, uint64_t setup,
    void *buffer, size_t size, size_t *size_transfered)
{
        /* Isochronous transfer are not supported (yet) */
        if (pipe->transfer_type != USB_TRANSFER_INTERRUPT &&
            pipe->transfer_type != USB_TRANSFER_BULK &&
            pipe->transfer_type != USB_TRANSFER_CONTROL)
            return ENOTSUP;

        int ret = pipe_add_ref(pipe, false);
        if (ret != EOK) {
                return ret;
        }

        /* Ensure serialization over the phone. */
        pipe_start_transaction(pipe);
        async_exch_t *exch = async_exchange_begin(pipe->hc_sess);
        if (!exch) {
                pipe_end_transaction(pipe);
                pipe_drop_ref(pipe);
                return ENOMEM;
        }

        ret = usbhc_read(exch, pipe->wire->address, pipe->endpoint_no,
            setup, buffer, size, size_transfered);
        async_exchange_end(exch);
        pipe_end_transaction(pipe);
        pipe_drop_ref(pipe);
        return ret;
}

/** Request an out transfer, no checking of input parameters.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[in] buffer Buffer with data to transfer.
 * @param[in] size Size of the buffer (in bytes).
 * @return Error code.
 */
static int usb_pipe_write_no_check(usb_pipe_t *pipe, uint64_t setup,
    const void *buffer, size_t size)
{
        /* Only interrupt and bulk transfers are supported */
        if (pipe->transfer_type != USB_TRANSFER_INTERRUPT &&
            pipe->transfer_type != USB_TRANSFER_BULK &&
            pipe->transfer_type != USB_TRANSFER_CONTROL)
            return ENOTSUP;

        int ret = pipe_add_ref(pipe, false);
        if (ret != EOK) {
                return ret;
        }

        /* Ensure serialization over the phone. */
        pipe_start_transaction(pipe);
        async_exch_t *exch = async_exchange_begin(pipe->hc_sess);
        if (!exch) {
                pipe_end_transaction(pipe);
                pipe_drop_ref(pipe);
                return ENOMEM;
        }
        ret = usbhc_write(exch, pipe->wire->address, pipe->endpoint_no,
            setup, buffer, size);
        async_exchange_end(exch);
        pipe_end_transaction(pipe);
        pipe_drop_ref(pipe);
        return ret;
}

/** Try to clear endpoint halt of default control pipe.
 *
 * @param pipe Pipe for control endpoint zero.
 */
static void clear_self_endpoint_halt(usb_pipe_t *pipe)
{
        assert(pipe != NULL);

        if (!pipe->auto_reset_halt || (pipe->endpoint_no != 0)) {
                return;
        }


        /* Prevent infinite recursion. */
        pipe->auto_reset_halt = false;
        usb_request_clear_endpoint_halt(pipe, 0);
        pipe->auto_reset_halt = true;
}

/** Request a control read transfer on an endpoint pipe.
 *
 * This function encapsulates all three stages of a control transfer.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[in] setup_buffer Buffer with the setup packet.
 * @param[in] setup_buffer_size Size of the setup packet (in bytes).
 * @param[out] data_buffer Buffer for incoming data.
 * @param[in] data_buffer_size Size of the buffer for incoming data (in bytes).
 * @param[out] data_transfered_size Number of bytes that were actually
 *                                  transfered during the DATA stage.
 * @return Error code.
 */
int usb_pipe_control_read(usb_pipe_t *pipe,
    const void *setup_buffer, size_t setup_buffer_size,
    void *data_buffer, size_t data_buffer_size, size_t *data_transfered_size)
{
        assert(pipe);

        if ((setup_buffer == NULL) || (setup_buffer_size != 8)) {
                return EINVAL;
        }

        if ((data_buffer == NULL) || (data_buffer_size == 0)) {
                return EINVAL;
        }

        if ((pipe->direction != USB_DIRECTION_BOTH)
            || (pipe->transfer_type != USB_TRANSFER_CONTROL)) {
                return EBADF;
        }

        uint64_t setup_packet;
        memcpy(&setup_packet, setup_buffer, 8);

        size_t act_size = 0;
        const int rc = usb_pipe_read_no_check(pipe, setup_packet,
            data_buffer, data_buffer_size, &act_size);

        if (rc == ESTALL) {
                clear_self_endpoint_halt(pipe);
        }

        if (rc == EOK && data_transfered_size != NULL) {
                *data_transfered_size = act_size;
        }

        return rc;
}

/** Request a control write transfer on an endpoint pipe.
 *
 * This function encapsulates all three stages of a control transfer.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[in] setup_buffer Buffer with the setup packet.
 * @param[in] setup_buffer_size Size of the setup packet (in bytes).
 * @param[in] data_buffer Buffer with data to be sent.
 * @param[in] data_buffer_size Size of the buffer with outgoing data (in bytes).
 * @return Error code.
 */
int usb_pipe_control_write(usb_pipe_t *pipe,
    const void *setup_buffer, size_t setup_buffer_size,
    const void *data_buffer, size_t data_buffer_size)
{
        assert(pipe);

        if ((setup_buffer == NULL) || (setup_buffer_size != 8)) {
                return EINVAL;
        }

        if ((data_buffer == NULL) && (data_buffer_size > 0)) {
                return EINVAL;
        }

        if ((data_buffer != NULL) && (data_buffer_size == 0)) {
                return EINVAL;
        }

        if ((pipe->direction != USB_DIRECTION_BOTH)
            || (pipe->transfer_type != USB_TRANSFER_CONTROL)) {
                return EBADF;
        }

        uint64_t setup_packet;
        memcpy(&setup_packet, setup_buffer, 8);

        const int rc = usb_pipe_write_no_check(pipe, setup_packet,
            data_buffer, data_buffer_size);

        if (rc == ESTALL) {
                clear_self_endpoint_halt(pipe);
        }

        return rc;
}

/** Request a read (in) transfer on an endpoint pipe.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[out] buffer Buffer where to store the data.
 * @param[in] size Size of the buffer (in bytes).
 * @param[out] size_transfered Number of bytes that were actually transfered.
 * @return Error code.
 */
int usb_pipe_read(usb_pipe_t *pipe,
    void *buffer, size_t size, size_t *size_transfered)
{
        assert(pipe);

        if (buffer == NULL) {
                return EINVAL;
        }

        if (size == 0) {
                return EINVAL;
        }

        if (pipe->direction != USB_DIRECTION_IN) {
                return EBADF;
        }

        if (pipe->transfer_type == USB_TRANSFER_CONTROL) {
                return EBADF;
        }

        size_t act_size = 0;
        const int rc = usb_pipe_read_no_check(pipe, 0, buffer, size, &act_size);


        if (rc == EOK && size_transfered != NULL) {
                *size_transfered = act_size;
        }

        return rc;
}

/** Request a write (out) transfer on an endpoint pipe.
 *
 * @param[in] pipe Pipe used for the transfer.
 * @param[in] buffer Buffer with data to transfer.
 * @param[in] size Size of the buffer (in bytes).
 * @return Error code.
 */
int usb_pipe_write(usb_pipe_t *pipe, const void *buffer, size_t size)
{
        assert(pipe);

        if (buffer == NULL || size == 0) {
                return EINVAL;
        }

        if (pipe->direction != USB_DIRECTION_OUT) {
                return EBADF;
        }

        if (pipe->transfer_type == USB_TRANSFER_CONTROL) {
                return EBADF;
        }

        return usb_pipe_write_no_check(pipe, 0, buffer, size);
}

/**
 * @}
 */