source: mainline/uspace/lib/usb/hcd.h@ bc9a629

/*
 * 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 usb
 * @{
 */
/** @file
 * @brief USB Host Controller Driver.
 */
#ifndef LIBUSB_HCD_H_
#define LIBUSB_HCD_H_

#include <ipc/ipc.h>
#include <async.h>

/** Maximum size of transaction payload. */
#define USB_MAX_PAYLOAD_SIZE 1020

/** USB transfer type. */
typedef enum {
        USB_TRANSFER_ISOCHRONOUS,
        USB_TRANSFER_INTERRUPT,
        USB_TRANSFER_CONTROL,
        USB_TRANSFER_BULK
} usb_transfer_type_t;

const char * usb_str_transfer_type(usb_transfer_type_t t);

/** USB data transfer direction. */
typedef enum {
        USB_DIRECTION_IN,
        USB_DIRECTION_OUT
} usb_direction_t;

/** USB address type.
 * Negative values could be used to indicate error.
 */
typedef int usb_address_t;

/** USB endpoint number type.
 * Negative values could be used to indicate error.
 */
typedef int usb_endpoint_t;

/** USB complete address type. 
 * Pair address + endpoint is identification of transaction recipient.
 */
typedef struct {
        usb_address_t address;
        usb_endpoint_t endpoint;
} usb_target_t;

static inline int usb_target_same(usb_target_t a, usb_target_t b)
{
        return (a.address == b.address)
            && (a.endpoint == b.endpoint);
}

/** Opaque handle of active USB transaction.
 * This handle is when informing about transaction outcome (or status).
 */
typedef ipcarg_t usb_transaction_handle_t;

/** USB transaction outcome. */
typedef enum {
        USB_OUTCOME_OK,
        USB_OUTCOME_CRCERROR,
        USB_OUTCOME_BABBLE
} usb_transaction_outcome_t;

const char * usb_str_transaction_outcome(usb_transaction_outcome_t o);

/** IPC methods for HCD. */
typedef enum {
        /** Send data over USB to a function.
         * This method initializes large data transfer that must follow
         * immediatelly.
         * The recipient of this method must issue immediately data reception
         * and answer this call after data buffer was transfered.
         * 
         * Arguments of the call:
         * - USB address of the function
         * - endpoint of the function
         * - transfer type
         * - flags (not used)
         * 
         * Answer:
         * - EOK - ready to accept the data buffer
         * - ELIMIT - too many transactions for current connection
         * - ENOENT - callback connection does not exist
         * - EINVAL - other kind of error
         * 
         * Arguments of the answer:
         * - opaque transaction handle (used in callbacks)
         */
        IPC_M_USB_HCD_SEND_DATA = IPC_FIRST_USER_METHOD,
        
        /** Initiate data receive from a function.
         * This method announces the HCD that some data will come.
         * When this data arrives, the HCD will call back with
         * IPC_M_USB_HCD_DATA_RECEIVED.
         * 
         * Arguments of the call:
         * - USB address of the function
         * - endpoint of the function
         * - transfer type
         * - buffer size
         * - flags (not used)
         *
         * Answer:
         * - EOK - HCD accepted the request
         * - ELIMIT - too many transactions for current connection
         * - ENOENT - callback connection does not exist
         *
         * Arguments of the answer:
         * - opaque transaction handle (used in callbacks)
         */
        IPC_M_USB_HCD_RECEIVE_DATA,
        
        /** Tell maximum size of the transaction buffer (payload).
         * 
         * Arguments of the call:
         *  (none)
         * 
         * Answer:
         * - EOK - always
         * 
         * Arguments of the answer:
         * - buffer size (in bytes):
         */
        IPC_M_USB_HCD_TRANSACTION_SIZE
} usb_hcd_method_t;

/** IPC methods for callbacks from HCD. */
typedef enum {
        /** Confimation after data sent.
         * 
         * Arguments of the call:
         * - transaction handle
         * - transaction outcome
         */
        IPC_M_USB_HCD_DATA_SENT = IPC_FIRST_USER_METHOD,
        
        /** Notification of data received.
         * This call initiates sending a data buffer from HCD to the client.
         * See IPC_M_USB_HCD_SEND_DATA for details for buffer transfer is
         * done.
         * 
         * Arguments of the call:
         * - transaction handle
         * - transaction outcome
         * - actual data length
         */
        IPC_M_USB_HCD_DATA_RECEIVED,
        
        /** Notification about a serious trouble with HC.
         */
        IPC_M_USB_HCD_CONTROLLER_FAILURE
} usb_hcd_callback_method_t;


int usb_hcd_create_phones(const char *, async_client_conn_t);
int usb_hcd_send_data_to_function(int, usb_target_t, usb_transfer_type_t,
    void *, size_t, usb_transaction_handle_t *);
int usb_hcd_prepare_data_reception(int, usb_target_t, usb_transfer_type_t,
    size_t, usb_transaction_handle_t *);

#endif
/**
 * @}
 */