source: mainline/uspace/lib/usbvirt/ctrlpipe.c@ fb1dca09

/*
 * Copyright (c) 2010 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 libusbvirt usb
 * @{
 */
/** @file
 * @brief Device control pipe.
 */
#include <errno.h>

#include "private.h"

#define REQUEST_TYPE_STANDARD 0 
#define REQUEST_TYPE_CLASS 1

#define GET_MIDBITS_MASK(size, shift) \
        (((1 << size) - 1) << shift)
#define GET_MIDBITS(value, size, shift) \
        ((value & GET_MIDBITS_MASK(size, shift)) >> shift)


static const char *str_request_type(int type)
{
        switch (type) {
                case REQUEST_TYPE_STANDARD:
                        return "standard";
                case REQUEST_TYPE_CLASS:
                        return "class";
                default:
                        return "unknown";
        }
}

/** Tell request type.
 * By type is meant either standard, class, vendor or other.
 */
static int request_get_type(uint8_t request_type)
{
        return GET_MIDBITS(request_type, 2, 5);
}

/** Handle communication over control pipe zero.
 */
int control_pipe(usbvirt_device_t *device, usbvirt_control_transfer_t *transfer)
{
        device->lib_debug(device, 1, USBVIRT_DEBUGTAG_CONTROL_PIPE_ZERO,
            "op on control pipe zero (request_size=%u)", transfer->request_size);
        
        if (transfer->request_size < sizeof(usb_device_request_setup_packet_t)) {
                return ENOMEM;
        }
        
        usb_device_request_setup_packet_t *request = (usb_device_request_setup_packet_t *) transfer->request;
        uint8_t *remaining_data = transfer->data;
        
        int type = request_get_type(request->request_type);
        
        int rc = EOK;
        
        device->lib_debug(device, 2, USBVIRT_DEBUGTAG_CONTROL_PIPE_ZERO,
            "request type: %s", str_request_type(type));
        
        switch (type) {
                case REQUEST_TYPE_STANDARD:
                        rc = handle_std_request(device, request, remaining_data);
                        break;
                case REQUEST_TYPE_CLASS:
                        if (DEVICE_HAS_OP(device, on_class_device_request)) {
                                rc = device->ops->on_class_device_request(device,
                                    request, remaining_data);
                        }
                        break;
                default:
                        break;
        }
        
        if (device->new_address != -1) {
                /*
                 * TODO: handle when this request is invalid (e.g.
                 * setting address when in configured state).
                 */
                if (device->new_address == 0) {
                        device->state = USBVIRT_STATE_DEFAULT;
                } else {
                        device->state = USBVIRT_STATE_ADDRESS;
                }
                device->address = device->new_address;
                
                device->new_address = -1;
                
                device->lib_debug(device, 2, USBVIRT_DEBUGTAG_CONTROL_PIPE_ZERO,
                    "device address changed to %d (state %s)",
                    device->address, str_device_state(device->state));
        }
        
        return rc;
}

/**
 * @}
 */