source: mainline/uspace/drv/char/msim-con/msim-con.c@ 74017ce

/*
 * Copyright (c) 2006 Josef Cejka
 * Copyright (c) 2011 Jiri Svoboda
 * 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.
 */

/** @file
 * @brief Msim console driver.
 */

#include <async.h>
#include <ddf/driver.h>
#include <ddf/log.h>
#include <ddi.h>
#include <errno.h>
#include <ipc/char.h>

#include "msim-con.h"

static void msim_con_connection(ipc_callid_t, ipc_call_t *, void *);

static irq_cmd_t msim_cmds_proto[] = {
        {
                .cmd = CMD_PIO_READ_8,
                .addr = (void *) 0,     /* will be patched in run-time */
                .dstarg = 2
        },
        {
                .cmd = CMD_ACCEPT
        }
};

static void msim_irq_handler(ipc_callid_t iid, ipc_call_t *call, void *arg)
{
        msim_con_t *con = (msim_con_t *) arg;
        uint8_t c;

        c = IPC_GET_ARG2(*call);

        if (con->client_sess != NULL) {
                async_exch_t *exch = async_exchange_begin(con->client_sess);
                async_msg_1(exch, CHAR_NOTIF_BYTE, c);
                async_exchange_end(exch);
        }
}

/** Add msim console device. */
int msim_con_add(msim_con_t *con, msim_con_res_t *res)
{
        ddf_fun_t *fun = NULL;
        bool subscribed = false;
        irq_cmd_t *msim_cmds = NULL;
        int rc;

        msim_cmds = malloc(sizeof(msim_cmds_proto));
        if (msim_cmds == NULL) {
                rc = ENOMEM;
                goto error;
        }

        con->res = *res;

        fun = ddf_fun_create(con->dev, fun_exposed, "a");
        if (fun == NULL) {
                ddf_msg(LVL_ERROR, "Error creating function 'a'.");
                rc = ENOMEM;
                goto error;
        }

        ddf_fun_set_conn_handler(fun, msim_con_connection);

        con->irq_range[0].base = res->base;
        con->irq_range[0].size = 1;

        memcpy(msim_cmds, msim_cmds_proto, sizeof(msim_cmds_proto));
        msim_cmds[0].addr = (void *) res->base;

        con->irq_code.rangecount = 1;
        con->irq_code.ranges = con->irq_range;
        con->irq_code.cmdcount = sizeof(msim_cmds_proto) / sizeof(irq_cmd_t);
        con->irq_code.cmds = msim_cmds;

        async_irq_subscribe(res->irq, msim_irq_handler, con, &con->irq_code);
        subscribed = true;

        rc = ddf_fun_bind(fun);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Error binding function 'a'.");
                goto error;
        }

        return EOK;
error:
        if (subscribed)
                async_irq_unsubscribe(res->irq);
        if (fun != NULL)
                ddf_fun_destroy(fun);
        free(msim_cmds);

        return rc;
}

/** Remove msim console device */
int msim_con_remove(msim_con_t *con)
{
        return ENOTSUP;
}

/** Msim console device gone */
int msim_con_gone(msim_con_t *con)
{
        return ENOTSUP;
}

static void msim_con_putchar(msim_con_t *con, uint8_t ch)
{
}

/** Character device connection handler. */
static void msim_con_connection(ipc_callid_t iid, ipc_call_t *icall,
    void *arg)
{
        msim_con_t *con;

        /* Answer the IPC_M_CONNECT_ME_TO call. */
        async_answer_0(iid, EOK);

        con = (msim_con_t *)ddf_dev_data_get(ddf_fun_get_dev((ddf_fun_t *)arg));

        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                sysarg_t method = IPC_GET_IMETHOD(call);

                if (!method) {
                        /* The other side has hung up. */
                        async_answer_0(callid, EOK);
                        return;
                }

                async_sess_t *sess =
                    async_callback_receive_start(EXCHANGE_SERIALIZE, &call);
                if (sess != NULL) {
                        if (con->client_sess == NULL) {
                                con->client_sess = sess;
                                async_answer_0(callid, EOK);
                        } else
                                async_answer_0(callid, ELIMIT);
                } else {
                        switch (method) {
                        case CHAR_WRITE_BYTE:
                                ddf_msg(LVL_DEBUG, "Write %" PRIun " to device\n",
                                    IPC_GET_ARG1(call));
                                msim_con_putchar(con, (uint8_t) IPC_GET_ARG1(call));
                                async_answer_0(callid, EOK);
                                break;
                        default:
                                async_answer_0(callid, EINVAL);
                        }
                }
        }
}

/** @}
 */