source: mainline/uspace/lib/drv/generic/remote_usbhid.c@ eb2f7dd

/*
 * 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.
 */

/** @addtogroup libdrv
 * @{
 */
/** @file
 */

#include <async.h>
#include <errno.h>
#include <assert.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_(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);

/** Remote USB HID interface operations. */
static remote_iface_func_ptr_t remote_usbhid_iface_ops [] = {
        remote_usbhid_get_event_length,
        remote_usbhid_get_event
};

/** Remote USB HID interface structure.
 */
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)
{
        usbhid_iface_t *hid_iface = (usbhid_iface_t *) iface;

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

        int len = hid_iface->get_event_length(fun);
        if (len == 0) {
                len = EEMPTY;
        }
        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);
        }

        int rc;

        size_t items = len / 2;
        uint16_t *usage_pages_and_usages = malloc(sizeof(uint16_t) * len);
        if (usage_pages_and_usages == NULL) {
                async_answer_0(data_callid, ENOMEM);
                async_answer_0(callid, ENOMEM);
        }

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

        async_data_read_finalize(data_callid, usage_pages_and_usages,
            act_items * 2 * sizeof(uint16_t));

        free(usage_pages_and_usages);

        async_answer_0(callid, EOK);
}

/**
 * @}
 */