source: mainline/uspace/lib/drv/generic/remote_clock_dev.c@ 8fd0675f

/*
 * SPDX-FileCopyrightText: 2012 Maurizio Lombardi
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/** @addtogroup libdrv
 * @{
 */
/** @file
 */

#include <async.h>
#include <errno.h>
#include <time.h>
#include <macros.h>
#include <device/clock_dev.h>

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

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

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

/** Remote clock interface structure
 *
 * Interface for processing requests from remote clients
 * addressed by the clock interface.
 */
const remote_iface_t remote_clock_dev_iface = {
        .method_count = ARRAY_SIZE(remote_clock_dev_iface_ops),
        .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_call_t *call)
{
        clock_dev_ops_t *clock_dev_ops = (clock_dev_ops_t *) ops;
        struct tm t;
        errno_t rc;

        ipc_call_t data;
        size_t len;
        if (!async_data_read_receive(&data, &len)) {
                /* TODO: Handle protocol error */
                async_answer_0(call, EINVAL);
                return;
        }

        if (!clock_dev_ops->time_get) {
                /* The driver does not provide the time_get() functionality */
                async_answer_0(&data, ENOTSUP);
                async_answer_0(call, ENOTSUP);
                return;
        }

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

        if (rc != EOK) {
                /* Some error occurred */
                async_answer_0(&data, rc);
                async_answer_0(call, rc);
                return;
        }

        /* The operation was successful */
        async_data_read_finalize(&data, &t, sizeof(struct tm));
        async_answer_0(call, rc);
}

/** Process the time_set() 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_call_t *call)
{
        clock_dev_ops_t *clock_dev_ops = (clock_dev_ops_t *) ops;
        errno_t rc;
        struct tm t;

        ipc_call_t data;
        size_t len;

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

        if (!clock_dev_ops->time_set) {
                /* The driver does not support the time_set() functionality */
                async_answer_0(&data, ENOTSUP);
                async_answer_0(call, ENOTSUP);
                return;
        }

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

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

        async_answer_0(call, rc);
}

/**
 * @}
 */