source: mainline/uspace/lib/drv/generic/remote_battery_dev.c

/*
 * 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 <ops/battery_dev.h>
#include <battery_iface.h>
#include <ddf/driver.h>
#include <macros.h>

/** Read the current battery status from the device
 *
 * @param sess     Session of the device
 * @param status   Current status of the battery
 *
 * @return         EOK on success or an error code
 */
errno_t
battery_status_get(async_sess_t *sess, battery_status_t *batt_status)
{
        sysarg_t status;

        async_exch_t *exch = async_exchange_begin(sess);

        errno_t const rc = async_req_1_1(exch, DEV_IFACE_ID(BATTERY_DEV_IFACE),
            BATTERY_STATUS_GET, &status);

        async_exchange_end(exch);

        if (rc == EOK)
                *batt_status = (battery_status_t) status;

        return rc;
}

/** Read the current battery charge level from the device
 *
 * @param sess     Session of the device
 * @param level    Battery charge level (0 - 100)
 *
 * @return         EOK on success or an error code
 */
errno_t
battery_charge_level_get(async_sess_t *sess, int *level)
{
        sysarg_t charge_level;

        async_exch_t *exch = async_exchange_begin(sess);

        errno_t const rc = async_req_1_1(exch, DEV_IFACE_ID(BATTERY_DEV_IFACE),
            BATTERY_CHARGE_LEVEL_GET, &charge_level);

        async_exchange_end(exch);

        if (rc == EOK)
                *level = (int) charge_level;

        return rc;
}

static void remote_battery_status_get(ddf_fun_t *, void *, ipc_call_t *);
static void remote_battery_charge_level_get(ddf_fun_t *, void *, ipc_call_t *);

/** Remote battery interface operations */
static const remote_iface_func_ptr_t remote_battery_dev_iface_ops[] = {
        [BATTERY_STATUS_GET] = remote_battery_status_get,
        [BATTERY_CHARGE_LEVEL_GET] = remote_battery_charge_level_get,
};

/** Remote battery interface structure
 *
 * Interface for processing request from remote clients
 * addressed by the battery interface.
 *
 */
const remote_iface_t remote_battery_dev_iface = {
        .method_count = ARRAY_SIZE(remote_battery_dev_iface_ops),
        .methods = remote_battery_dev_iface_ops,
};

/** Process the status_get() request from the remote client
 *
 * @param fun The function from which the battery status is read
 * @param ops The local ops structure
 *
 */
static void remote_battery_status_get(ddf_fun_t *fun, void *ops,
    ipc_call_t *call)
{
        const battery_dev_ops_t *bops = (battery_dev_ops_t *) ops;

        if (bops->battery_status_get == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        battery_status_t batt_status;
        const errno_t rc = bops->battery_status_get(fun, &batt_status);

        if (rc != EOK)
                async_answer_0(call, rc);
        else
                async_answer_1(call, rc, batt_status);
}

/** Process the battery_charge_level_get() request from the remote client
 *
 * @param fun  The function from which the battery charge level is read
 * @param ops The local ops structure
 *
 */
static void remote_battery_charge_level_get(ddf_fun_t *fun, void *ops,
    ipc_call_t *call)
{
        const battery_dev_ops_t *bops = (battery_dev_ops_t *) ops;

        if (bops->battery_charge_level_get == NULL) {
                async_answer_0(call, ENOTSUP);
                return;
        }

        int battery_level;
        const errno_t rc = bops->battery_charge_level_get(fun, &battery_level);

        if (rc != EOK)
                async_answer_0(call, rc);
        else
                async_answer_1(call, rc, battery_level);
}