remote_usbhid.c

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/*
 * Copyright (c) 2010-2011 Vojtech Horky
 * 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.
 */

#include <async.h>
#include <errno.h>
#include <assert.h>
#include <stdio.h>

#include "usbhid_iface.h"
#include "ddf/driver.h"

static void remote_usbhid_get_event_length(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usbhid_get_event(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usbhid_get_report_descriptor_length(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
static void remote_usbhid_get_report_descriptor(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
// static void remote_usbhid_(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);

static remote_iface_func_ptr_t remote_usbhid_iface_ops [] = {
        remote_usbhid_get_event_length,
        remote_usbhid_get_event,
        remote_usbhid_get_report_descriptor_length,
        remote_usbhid_get_report_descriptor
};

remote_iface_t remote_usbhid_iface = {
        .method_count = sizeof(remote_usbhid_iface_ops) /
            sizeof(remote_usbhid_iface_ops[0]),
        .methods = remote_usbhid_iface_ops
};

//usbhc_iface_t *usb_iface = (usbhc_iface_t *) iface;


void remote_usbhid_get_event_length(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        printf("remote_usbhid_get_event_length()\n");
        
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_event_length) {
                printf("Get event length not set!\n");
                async_answer_0(callid, ENOTSUP);
                return;
        }

        size_t len = hid_iface->get_event_length(fun);
//      if (len == 0) {
//              len = EEMPTY;
//      }
        async_answer_1(callid, EOK, len);
        
//      if (len < 0) {
//              async_answer_0(callid, len);
//      } else {
//              async_answer_1(callid, EOK, len);
//      }
}

void remote_usbhid_get_event(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_event) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        unsigned int flags = DEV_IPC_GET_ARG1(*call);

        size_t len;
        ipc_callid_t data_callid;
        if (!async_data_read_receive(&data_callid, &len)) {
                async_answer_0(callid, EPARTY);
                return;
        }
//      /* Check that length is even number. Truncate otherwise. */
//      if ((len % 2) == 1) {
//              len--;
//      }
        if (len == 0) {
                async_answer_0(data_callid, EINVAL);
                async_answer_0(callid, EINVAL);
                return;
        }

        int rc;

        uint8_t *data = malloc(len);
        if (data == NULL) {
                async_answer_0(data_callid, ENOMEM);
                async_answer_0(callid, ENOMEM);
                return;
        }

        size_t act_length;
        int event_nr;
        rc = hid_iface->get_event(fun, data, len, &act_length, &event_nr, flags);
        if (rc != EOK) {
                free(data);
                async_answer_0(data_callid, rc);
                async_answer_0(callid, rc);
                return;
        }
        if (act_length >= len) {
                /* This shall not happen. */
                // FIXME: how about an assert here?
                act_length = len;
        }

        async_data_read_finalize(data_callid, data, act_length);

        free(data);

        async_answer_1(callid, EOK, event_nr);
}

void remote_usbhid_get_report_descriptor_length(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_report_descriptor_length) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        size_t len = hid_iface->get_report_descriptor_length(fun);
        async_answer_1(callid, EOK, (sysarg_t) len);
}

void remote_usbhid_get_report_descriptor(ddf_fun_t *fun, void *iface,
    ipc_callid_t callid, ipc_call_t *call)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

        if (!hid_iface->get_report_descriptor) {
                async_answer_0(callid, ENOTSUP);
                return;
        }

        size_t len;
        ipc_callid_t data_callid;
        if (!async_data_read_receive(&data_callid, &len)) {
                async_answer_0(callid, EINVAL);
                return;
        }

        if (len == 0) {
                async_answer_0(data_callid, EINVAL);
                async_answer_0(callid, EINVAL);
                return;
        }

        uint8_t *descriptor = malloc(len);
        if (descriptor == NULL) {
                async_answer_0(data_callid, ENOMEM);
                async_answer_0(callid, ENOMEM);
                return;
        }

        size_t act_len = 0;
        int rc = hid_iface->get_report_descriptor(fun, descriptor, len,
            &act_len);
        if (act_len > len) {
                rc = ELIMIT;
        }
        if (rc != EOK) {
                free(descriptor);
                async_answer_0(data_callid, rc);
                async_answer_0(callid, rc);
                return;
        }

        async_data_read_finalize(data_callid, descriptor, act_len);
        async_answer_0(callid, EOK);

        free(descriptor);
}

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