source: mainline/uspace/lib/usb/hcd.c@ 63b4f90

/*
 * 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 (implementation).
 */
#include "hcd.h"
#include <devmap.h>
#include <stdlib.h>
#include <fcntl.h>
#include <vfs/vfs.h>
#include <errno.h>

/** Information about pending transaction on HC. */
typedef struct {
        /** Phone to host controller driver. */
        int phone;
        /** Data buffer. */
        void *buffer;
        /** Buffer size. */
        size_t size;
        /** Storage for actual number of bytes transferred. */
        size_t *size_transferred;
        /** Initial call replay data. */
        ipc_call_t reply;
        /** Initial call identifier. */
        aid_t request;
} transfer_info_t;

#define NAMESPACE "usb"


/** String representation of USB transaction outcome. */
const char * usb_str_transaction_outcome(usb_transaction_outcome_t o)
{
        switch (o) {
                case USB_OUTCOME_OK:
                        return "ok";
                case USB_OUTCOME_CRCERROR:
                        return "CRC error";
                case USB_OUTCOME_BABBLE:
                        return "babble";
                default:
                        return "unknown";
        }
}

/** Create necessary phones for communicating with HCD.
 * This function wraps following calls:
 * -# open <code>/dev/usb/<i>hcd_path</i></code> for reading
 * -# access phone of file opened in previous step
 * -# return the (outgoing) phone
 *
 * @warning This function is wrapper for several actions and therefore
 * it is not possible - in case of error - to determine at which point
 * error occurred.
 *
 * @param hcd_path HCD identification under devfs
 *     (without <code>/dev/usb/</code>).
 * @return Phone for communicating with HCD or error code from errno.h.
 */
int usb_hcd_connect(const char * hcd_path)
{
        char dev_path[DEVMAP_NAME_MAXLEN + 1];
        snprintf(dev_path, DEVMAP_NAME_MAXLEN,
            "/dev/%s/%s", NAMESPACE, hcd_path);
        
        int fd = open(dev_path, O_RDONLY);
        if (fd < 0) {
                return fd;
        }
        
        int hcd_phone = fd_phone(fd);
        
        if (hcd_phone < 0) {
                return hcd_phone;
        }

        return hcd_phone;
}

/** Send data to HCD.
 *
 * @param phone Opened phone to HCD.
 * @param method Method used for calling.
 * @param target Target device.
 * @param buffer Data buffer (NULL to skip data transfer phase).
 * @param size Buffer size (must be zero when @p buffer is NULL).
 * @param handle Storage for transaction handle (cannot be NULL).
 * @return Error status.
 * @retval EINVAL Invalid parameter.
 * @retval ENOMEM Not enough memory to complete the operation.
 */
static int async_send_buffer(int phone, int method,
    usb_target_t target,
    void *buffer, size_t size,
    usb_handle_t *handle)
{
        if (phone < 0) {
                return EINVAL;
        }
        
        if ((buffer == NULL) && (size > 0)) {
                return EINVAL;
        }
        
        if (handle == NULL) {
                return EINVAL;
        }

        transfer_info_t *transfer
            = (transfer_info_t *) malloc(sizeof(transfer_info_t));
        if (transfer == NULL) {
                return ENOMEM;
        }
        
        transfer->size_transferred = NULL;
        transfer->buffer = NULL;
        transfer->size = 0;
        transfer->phone = phone;

        int rc;
        
        transfer->request = async_send_3(phone,
            method,
            target.address, target.endpoint,
            size,
            &transfer->reply);
        
        if (size > 0) {
                rc = async_data_write_start(phone, buffer, size);
                if (rc != EOK) {
                        async_wait_for(transfer->request, NULL);
                        return rc;
                }
        }
        
        *handle = (usb_handle_t) transfer;
        
        return EOK;
}

/** Prepare data retrieval.
 *
 * @param phone Opened phone to HCD.
 * @param method Method used for calling.
 * @param target Target device.
 * @param buffer Buffer where to store retrieved data
 *      (NULL to skip data transfer phase).
 * @param size Buffer size (must be zero when @p buffer is NULL).
 * @param actual_size Storage where actual number of bytes transferred will
 *      be stored.
 * @param handle Storage for transaction handle (cannot be NULL).
 * @return Error status.
 * @retval EINVAL Invalid parameter.
 * @retval ENOMEM Not enough memory to complete the operation.
 */
static int async_recv_buffer(int phone, int method,
    usb_target_t target,
    void *buffer, size_t size, size_t *actual_size,
    usb_handle_t *handle)
{
        if (phone < 0) {
                return EINVAL;
        }
        
        if ((buffer == NULL) && (size > 0)) {
                return EINVAL;
        }
        
        if (handle == NULL) {
                return EINVAL;
        }

        transfer_info_t *transfer
            = (transfer_info_t *) malloc(sizeof(transfer_info_t));
        if (transfer == NULL) {
                return ENOMEM;
        }
        
        transfer->size_transferred = actual_size;
        transfer->buffer = buffer;
        transfer->size = size;
        transfer->phone = phone;
        
        transfer->request = async_send_3(phone,
            method,
            target.address, target.endpoint,
            size,
            &transfer->reply);
        
        *handle = (usb_handle_t) transfer;
        
        return EOK;
}

/** Read buffer from HCD.
 *
 * @param phone Opened phone to HCD.
 * @param hash Buffer hash (obtained after completing IN transaction).
 * @param buffer Buffer where to store data data.
 * @param size Buffer size.
 * @param actual_size Storage where actual number of bytes transferred will
 *      be stored.
 * @return Error status.
 */
static int read_buffer_in(int phone, ipcarg_t hash,
    void *buffer, size_t size, size_t *actual_size)
{
        ipc_call_t answer_data;
        ipcarg_t answer_rc;
        aid_t req;
        int rc;
        
        req = async_send_1(phone,
            IPC_M_USB_HCD_GET_BUFFER_ASYNC,
            hash,
            &answer_data);
        
        rc = async_data_read_start(phone, buffer, size);
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return EINVAL;
        }
        
        async_wait_for(req, &answer_rc);
        rc = (int)answer_rc;
        
        if (rc != EOK) {
                return rc;
        }
        
        *actual_size = IPC_GET_ARG1(answer_data);
        
        return EOK;
}

/** Blocks caller until given USB transaction is finished.
 * After the transaction is finished, the user can access all output data
 * given to initial call function.
 *
 * @param handle Transaction handle.
 * @return Error status.
 * @retval EOK No error.
 * @retval EBADMEM Invalid handle.
 * @retval ENOENT Data buffer associated with transaction does not exist.
 */
int usb_hcd_async_wait_for(usb_handle_t handle)
{
        if (handle == 0) {
                return EBADMEM;
        }
        
        int rc = EOK;
        
        transfer_info_t *transfer = (transfer_info_t *) handle;
        
        ipcarg_t answer_rc;
        async_wait_for(transfer->request, &answer_rc);
        
        if (answer_rc != EOK) {
                rc = (int) answer_rc;
                goto leave;
        }
        
        /*
         * If the buffer is not NULL, we must accept some data.
         */
        if ((transfer->buffer != NULL) && (transfer->size > 0)) {
                /*
                 * The buffer hash identifies the data on the server
                 * side.
                 * We will use it when actually reading-in the data.
                 */
                ipcarg_t buffer_hash = IPC_GET_ARG1(transfer->reply);
                if (buffer_hash == 0) {
                        rc = ENOENT;
                        goto leave;
                }
                
                size_t actual_size;
                rc = read_buffer_in(transfer->phone, buffer_hash,
                    transfer->buffer, transfer->size, &actual_size);
                
                if (rc != EOK) {
                        goto leave;
                }
                
                if (transfer->size_transferred) {
                        *(transfer->size_transferred) = actual_size;
                }
        }
        
leave:
        free(transfer);
        
        return rc;
}

/** Send interrupt data to device. */
int usb_hcd_async_transfer_interrupt_out(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size,
    usb_handle_t *handle)
{
        return async_send_buffer(hcd_phone,
            IPC_M_USB_HCD_INTERRUPT_OUT_ASYNC,
            target,
            buffer, size,
            handle);
}

/** Request interrupt data from device. */
int usb_hcd_async_transfer_interrupt_in(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size, size_t *actual_size,
    usb_handle_t *handle)
{
        return async_recv_buffer(hcd_phone,
            IPC_M_USB_HCD_INTERRUPT_IN_ASYNC,
            target,
            buffer, size, actual_size,
            handle);
}

/** Start WRITE control transfer. */
int usb_hcd_async_transfer_control_write_setup(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size,
    usb_handle_t *handle)
{
        return async_send_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_WRITE_SETUP_ASYNC,
            target,
            buffer, size,
            handle);
}

/** Send data during WRITE control transfer. */
int usb_hcd_async_transfer_control_write_data(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size,
    usb_handle_t *handle)
{
        return async_send_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_WRITE_DATA_ASYNC,
            target,
            buffer, size,
            handle);
}

/** Terminate WRITE control transfer. */
int usb_hcd_async_transfer_control_write_status(int hcd_phone,
    usb_target_t target,
    usb_handle_t *handle)
{
        return async_recv_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_WRITE_STATUS_ASYNC,
            target,
            NULL, 0, NULL,
            handle);
}

/** Start READ control transfer. */
int usb_hcd_async_transfer_control_read_setup(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size,
    usb_handle_t *handle)
{
        return async_send_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_READ_SETUP_ASYNC,
            target,
            buffer, size,
            handle);
}

/** Request data during READ control transfer. */
int usb_hcd_async_transfer_control_read_data(int hcd_phone,
    usb_target_t target,
    void *buffer, size_t size, size_t *actual_size,
    usb_handle_t *handle)
{
        return async_recv_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_READ_DATA_ASYNC,
            target,
            buffer, size, actual_size,
            handle);
}

/** Terminate READ control transfer. */
int usb_hcd_async_transfer_control_read_status(int hcd_phone,
    usb_target_t target,
    usb_handle_t *handle)
{
        return async_send_buffer(hcd_phone,
            IPC_M_USB_HCD_CONTROL_READ_STATUS_ASYNC,
            target,
            NULL, 0,
            handle);
}

/**
 * @}
 */