source: mainline/uspace/lib/usb/src/usb.c@ 6326155b

/*
 * 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 libusb
 * @{
 */
/** @file
 * Common USB functions.
 */
#include <usb/usb.h>
#include <usb/request.h>

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

#define ARR_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))

static const char *str_speed[] = {
        [USB_SPEED_LOW] = "low",
        [USB_SPEED_FULL] = "full",
        [USB_SPEED_HIGH] = "high",
};

static const char *str_transfer_type[] = {
        [USB_TRANSFER_CONTROL] = "control",
        [USB_TRANSFER_ISOCHRONOUS] = "isochronous",
        [USB_TRANSFER_BULK] = "bulk",
        [USB_TRANSFER_INTERRUPT] = "interrupt",
};

static const char *str_transfer_type_short[] = {
        [USB_TRANSFER_CONTROL] = "ctrl",
        [USB_TRANSFER_ISOCHRONOUS] = "iso",
        [USB_TRANSFER_BULK] = "bulk",
        [USB_TRANSFER_INTERRUPT] = "intr",
};

static const char *str_direction[] = {
        [USB_DIRECTION_IN] = "in",
        [USB_DIRECTION_OUT] = "out",
        [USB_DIRECTION_BOTH] = "both",
};

/** String representation for USB transfer type.
 *
 * @param t Transfer type.
 * @return Transfer type as a string (in English).
 */
const char *usb_str_transfer_type(usb_transfer_type_t t)
{
        if (t >= ARR_SIZE(str_transfer_type)) {
                return "invalid";
        }
        return str_transfer_type[t];
}

/** String representation for USB transfer type (short version).
 *
 * @param t Transfer type.
 * @return Transfer type as a short string for debugging messages.
 */
const char *usb_str_transfer_type_short(usb_transfer_type_t t)
{
        if (t >= ARR_SIZE(str_transfer_type_short)) {
                return "invl";
        }
        return str_transfer_type_short[t];
}

/** String representation of USB direction.
 *
 * @param d The direction.
 * @return Direction as a string (in English).
 */
const char *usb_str_direction(usb_direction_t d)
{
        if (d >= ARR_SIZE(str_direction)) {
                return "invalid";
        }
        return str_direction[d];
}

/** String representation of USB speed.
 *
 * @param s The speed.
 * @return USB speed as a string (in English).
 */
const char *usb_str_speed(usb_speed_t s)
{
        if (s >= ARR_SIZE(str_speed)) {
                return "invalid";
        }
        return str_speed[s];
}

/** Check setup packet data for signs of toggle reset.
 *
 * @param[in] requst Setup requst data.
 * @retval -1 No endpoints need reset.
 * @retval 0 All endpoints need reset.
 * @retval >0 Specified endpoint needs reset.
 */
int usb_request_needs_toggle_reset(
    const usb_device_request_setup_packet_t *request)
{
        assert(request);
        switch (request->request)
        {
        /* Clear Feature ENPOINT_STALL */
        case USB_DEVREQ_CLEAR_FEATURE: /*resets only cleared ep */
                /* 0x2 ( HOST to device | STANDART | TO ENPOINT) */
                if ((request->request_type == 0x2) &&
                    (request->value == USB_FEATURE_SELECTOR_ENDPOINT_HALT))
                        return uint16_usb2host(request->index);
                break;
        case USB_DEVREQ_SET_CONFIGURATION:
        case USB_DEVREQ_SET_INTERFACE:
                /* Recipient must be device, this resets all endpoints,
                 * In fact there should be no endpoints but EP 0 registered
                 * as different interfaces use different endpoints,
                 * unless you're changing configuration or alternative
                 * interface of an already setup device. */
                if (!(request->request_type & SETUP_REQUEST_TYPE_DEVICE_TO_HOST))
                        return 0;
                break;
        default:
                break;
        }
        return -1;
}

/**
 * @}
 */