source: mainline/uspace/drv/usbmid/usbmid.c@ 95120c3

/*
 * Copyright (c) 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 drvusbmid
 * @{
 */
/**
 * @file
 * Helper functions.
 */
#include <errno.h>
#include <str_error.h>
#include <stdlib.h>
#include <usb_iface.h>
#include <usb/ddfiface.h>
#include <usb/pipes.h>
#include <usb/classes/classes.h>
#include <usb/recognise.h>
#include "usbmid.h"

/** Callback for DDF USB interface. */
static int usb_iface_get_address_impl(device_t *device, devman_handle_t handle,
    usb_address_t *address)
{
        assert(device);
        device_t *parent = device->parent;

        /* Default error, device does not support this operation. */
        int rc = ENOTSUP;

        if (parent && parent->ops && parent->ops->interfaces[USB_DEV_IFACE]) {
                usb_iface_t *usb_iface
                    = (usb_iface_t *) parent->ops->interfaces[USB_DEV_IFACE];
                assert(usb_iface != NULL);

                if (usb_iface->get_address) {
                        rc = usb_iface->get_address(parent, parent->handle,
                            address);
                }
        }

        return rc;
}

static usb_iface_t child_usb_iface = {
        .get_hc_handle = usb_iface_get_hc_handle_hub_child_impl,
        .get_address = usb_iface_get_address_impl
};


static device_ops_t child_device_ops = {
        .interfaces[USB_DEV_IFACE] = &child_usb_iface
};

static device_ops_t mid_device_ops = {
        .interfaces[USB_DEV_IFACE] = &usb_iface_hub_impl
};

/** Create new USB multi interface device.
 *
 * @param dev Backing generic DDF device.
 * @return New USB MID device.
 * @retval NULL Error occured.
 */
usbmid_device_t *usbmid_device_create(device_t *dev)
{
        usbmid_device_t *mid = malloc(sizeof(usbmid_device_t));
        if (mid == NULL) {
                usb_log_error("Out of memory (wanted %zu bytes).\n",
                    sizeof(usbmid_device_t));
                return NULL;
        }

        int rc;
        rc = usb_device_connection_initialize_from_device(&mid->wire, dev);
        if (rc != EOK) {
                usb_log_error("Failed to initialize `USB wire': %s.\n",
                    str_error(rc));
                free(mid);
                return NULL;
        }

        rc = usb_endpoint_pipe_initialize_default_control(&mid->ctrl_pipe,
            &mid->wire);
        if (rc != EOK) {
                usb_log_error("Failed to initialize control pipe: %s.\n",
                    str_error(rc));
                free(mid);
                return NULL;
        }

        mid->dev = dev;
        dev->ops = &mid_device_ops;

        return mid;
}


/** Spawn new child device from one interface.
 *
 * @param parent Parent MID device.
 * @param device_descriptor Device descriptor.
 * @param interface_descriptor Interface descriptor.
 * @return Error code.
 */
int usbmid_spawn_interface_child(usbmid_device_t *parent,
    const usb_standard_device_descriptor_t *device_descriptor,
    const usb_standard_interface_descriptor_t *interface_descriptor)
{
        device_t *child = NULL;
        char *child_name = NULL;
        int rc;

        /* Create the device. */
        child = create_device();
        if (child == NULL) {
                rc = ENOMEM;
                goto error_leave;
        }

        /*
         * Name is class name followed by interface number.
         * The interface number shall provide uniqueness while the
         * class name something humanly understandable.
         */
        rc = asprintf(&child_name, "%s%d",
            usb_str_class(interface_descriptor->interface_class),
            (int) interface_descriptor->interface_number);
        if (rc < 0) {
                goto error_leave;
        }
        child->parent = parent->dev;
        child->name = child_name;
        child->ops = &child_device_ops;

        rc = usb_device_create_match_ids_from_interface(interface_descriptor,
            &child->match_ids);
        if (rc != EOK) {
                goto error_leave;
        }

        rc = child_device_register(child, parent->dev);
        if (rc != EOK) {
                goto error_leave;
        }

        return EOK;

error_leave:
        if (child != NULL) {
                child->name = NULL;
                /* This takes care of match_id deallocation as well. */
                delete_device(child);
        }
        if (child_name != NULL) {
                free(child_name);
        }

        return rc;
}

/**
 * @}
 */