source: mainline/uspace/srv/hid/input/port/chardev.c@ a8bf1ea

/*
 * 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.
 */

/** @addtogroup kbd_port
 * @ingroup kbd
 * @{
 */
/** @file
 * @brief Chardev keyboard port driver.
 */

#include <ipc/char.h>
#include <async.h>
#include <input.h>
#include <kbd_port.h>
#include <kbd.h>
#include <loc.h>
#include <errno.h>
#include <stdio.h>

static void kbd_port_events(ipc_callid_t iid, ipc_call_t *icall, void *arg);

static int chardev_port_init(kbd_dev_t *);
static void chardev_port_yield(void);
static void chardev_port_reclaim(void);
static void chardev_port_write(uint8_t data);

kbd_port_ops_t chardev_port = {
        .init = chardev_port_init,
        .yield = chardev_port_yield,
        .reclaim = chardev_port_reclaim,
        .write = chardev_port_write
};

static kbd_dev_t *kbd_dev;
static async_sess_t *dev_sess;

/** List of devices to try connecting to. */
static const char *in_devs[] = {
        "char/s3c24ser"
};

static const unsigned int num_devs = sizeof(in_devs) / sizeof(in_devs[0]);

static int chardev_port_init(kbd_dev_t *kdev)
{
        service_id_t service_id;
        async_exch_t *exch;
        unsigned int i;
        int rc;
        
        kbd_dev = kdev;
        
        for (i = 0; i < num_devs; i++) {
                rc = loc_service_get_id(in_devs[i], &service_id, 0);
                if (rc == EOK)
                        break;
        }
        
        if (i >= num_devs) {
                printf("%s: Could not find any suitable input device\n", NAME);
                return -1;
        }
        
        dev_sess = loc_service_connect(EXCHANGE_ATOMIC, service_id,
            IPC_FLAG_BLOCKING);
        if (dev_sess == NULL) {
                printf("%s: Failed connecting to device\n", NAME);
                return ENOENT;
        }
        
        exch = async_exchange_begin(dev_sess);
        if (exch == NULL) {
                printf("%s: Failed starting exchange with device\n", NAME);
                async_hangup(dev_sess);
                return ENOMEM;
        }
        
        /* NB: The callback connection is slotted for removal */
        rc = async_connect_to_me(exch, 0, 0, 0, kbd_port_events, NULL);
        async_exchange_end(exch);
        
        if (rc != 0) {
                printf("%s: Failed to create callback from device\n", NAME);
                async_hangup(dev_sess);
                return -1;
        }
        
        return 0;
}

static void chardev_port_yield(void)
{
}

static void chardev_port_reclaim(void)
{
}

static void chardev_port_write(uint8_t data)
{
        async_exch_t *exch = async_exchange_begin(dev_sess);
        if (exch == NULL) {
                printf("%s: Failed starting exchange with device\n", NAME);
                return;
        }

        async_msg_1(exch, CHAR_WRITE_BYTE, data);
        async_exchange_end(exch);
}

static void kbd_port_events(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        /* Ignore parameters, the connection is already opened */
        while (true) {

                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call)) {
                        /* TODO: Handle hangup */
                        return;
                }

                int retval;

                switch (IPC_GET_IMETHOD(call)) {
                case CHAR_NOTIF_BYTE:
                        kbd_push_data(kbd_dev, IPC_GET_ARG1(call));
                        break;
                default:
                        retval = ENOENT;
                }
                async_answer_0(callid, retval);
        }
}


/**
 * @}
 */