source: mainline/uspace/drv/char/ski-con/ski-con.c@ 676e833

/*
 * Copyright (c) 2005 Jakub Jermar
 * 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 Ski console driver.
 */

#include <ddf/driver.h>
#include <ddf/log.h>
#include <errno.h>
#include <ipc/char.h>
#include <stdint.h>
#include <stdlib.h>
#include <thread.h>
#include <stdbool.h>

#include "ski-con.h"

#define SKI_GETCHAR             21

#define POLL_INTERVAL           10000

static void ski_con_thread_impl(void *arg);
static int32_t ski_con_getchar(void);
static void ski_con_connection(ipc_callid_t, ipc_call_t *, void *);

/** Add ski console device. */
int ski_con_add(ski_con_t *con)
{
        thread_id_t tid;
        ddf_fun_t *fun = NULL;
        bool bound = false;
        int rc;

        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, ski_con_connection);

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

        bound = true;

        rc = thread_create(ski_con_thread_impl, con, "kbd_poll", &tid);
        if (rc != 0) {
                return rc;
        }

        return EOK;
error:
        if (bound)
                ddf_fun_unbind(fun);
        if (fun != NULL)
                ddf_fun_destroy(fun);

        return rc;
}

/** Remove ski console device */
int ski_con_remove(ski_con_t *con)
{
        return ENOTSUP;
}

/** Ski console device gone */
int ski_con_gone(ski_con_t *con)
{
        return ENOTSUP;
}

/** Thread to poll Ski for keypresses. */
static void ski_con_thread_impl(void *arg)
{
        int32_t c;
        ski_con_t *con = (ski_con_t *) arg;

        while (1) {
                while (1) {
                        c = ski_con_getchar();
                        if (c == 0)
                                break;

                        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);
                        }
                }

                thread_usleep(POLL_INTERVAL);
        }
}

/** Ask Ski if a key was pressed.
 *
 * Use SSC (Simulator System Call) to get character from the debug console.
 * This call is non-blocking.
 *
 * @return ASCII code of pressed key or 0 if no key pressed.
 */
static int32_t ski_con_getchar(void)
{
        uint64_t ch;

#ifdef UARCH_ia64
        asm volatile (
                "mov r15 = %1\n"
                "break 0x80000;;\n"     /* modifies r8 */
                "mov %0 = r8;;\n"

                : "=r" (ch)
                : "i" (SKI_GETCHAR)
                : "r15", "r8"
        );
#else
        ch = 0;
#endif
        return (int32_t) ch;
}

static void ski_con_putchar(ski_con_t *con, char ch)
{
        
}

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

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

        con = (ski_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));
                                ski_con_putchar(con, (uint8_t) IPC_GET_ARG1(call));
                                async_answer_0(callid, EOK);
                                break;
                        default:
                                async_answer_0(callid, EINVAL);
                        }
                }
        }
}

/** @}
 */