source: mainline/uspace/lib/drv/generic/remote_clock_dev.c@ f4ebaf3c

/*
 * Copyright (c) 2012 Maurizio Lombardi
 * 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 libdrv
 * @{
 */
/** @file
 */

#include <async.h>
#include <errno.h>
#include <time.h>

#include <ops/clock_dev.h>
#include <ddf/driver.h>

static void remote_clock_time_get(ddf_fun_t *, void *, ipc_callid_t,
    ipc_call_t *);
static void remote_clock_time_set(ddf_fun_t *, void *, ipc_callid_t,
    ipc_call_t *);

/** Remote clock interface operations */
static remote_iface_func_ptr_t remote_clock_dev_iface_ops[] = {
        &remote_clock_time_get,
        &remote_clock_time_set,
};

/** Remote clock interface structure
 *
 * Interface for processing requests from remote clients
 * addressed by the clock interface.
 */
remote_iface_t remote_clock_dev_iface = {
        .method_count = sizeof(remote_clock_dev_iface_ops) /
            sizeof(remote_iface_func_ptr_t),
        .methods = remote_clock_dev_iface_ops,
};

/** Process the time_get() request from the remote client
 *
 * @param fun   The function from which the time is read
 * @param ops   The local ops structure
 */
static void
remote_clock_time_get(ddf_fun_t *fun, void *ops, ipc_callid_t callid,
    ipc_call_t *call)
{
        clock_dev_ops_t *clock_dev_ops = (clock_dev_ops_t *) ops;
        ipc_callid_t cid;
        struct tm t;
        int rc;
        size_t len;

        if (!async_data_read_receive(&cid, &len)) {
                /* TODO: Handle protocol error */
                async_answer_0(callid, EINVAL);
                return;
        }

        if (!clock_dev_ops->time_get) {
                /* The driver does not provide the time_get() functionality */
                async_data_read_finalize(cid, NULL, 0);
                async_answer_0(callid, ENOTSUP);
                return;
        }

        rc = (*clock_dev_ops->time_get)(fun, &t);

        if (rc != EOK) {
                /* Some error occurred */
                async_data_read_finalize(cid, NULL, 0);
                async_answer_0(callid, rc);
        }

        /* The operation was successful */
        async_data_read_finalize(cid, &t, sizeof(struct tm));
        async_answer_1(callid, EOK, rc);
}

/** Process the write request from the remote client
 *
 * @param fun   The function to which the data are written
 * @param ops   The local ops structure
 */
static void remote_clock_time_set(ddf_fun_t *fun, void *ops,
    ipc_callid_t callid, ipc_call_t *call)
{
        clock_dev_ops_t *clock_dev_ops = (clock_dev_ops_t *) ops;
        int          rc;
        struct tm    t;
        ipc_callid_t cid;
        size_t       len;

        if (!async_data_write_receive(&cid, &len)) {
                /* TODO: Handle protocol error */
                async_answer_0(callid, EINVAL);
                return;
        }

        if (!clock_dev_ops->time_set) {
                /* The driver does not support the time_set() functionality */
                async_data_write_finalize(cid, NULL, 0);
                async_answer_0(callid, ENOTSUP);
                return;
        }

        async_data_write_finalize(cid, &t, sizeof(struct tm));

        rc = (*clock_dev_ops->time_set)(fun, &t);
        if (rc < 0) {
                /* Some error occurred */
                async_answer_0(callid, rc);
                return;
        }

        async_answer_1(callid, EOK, rc);
}

/**
 * @}
 */