source: mainline/uspace/lib/usb/src/usbdrvreq.c@ f5e39475

/*
 * 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 driver - standard USB requests (implementation).
 */
#include <usb/usbdrv.h>
#include <errno.h>

/** Change address of connected device.
 *
 * @see usb_drv_reserve_default_address
 * @see usb_drv_release_default_address
 * @see usb_drv_request_address
 * @see usb_drv_release_address
 * @see usb_drv_bind_address
 *
 * @param phone Open phone to HC driver.
 * @param old_address Current address.
 * @param address Address to be set.
 * @return Error code.
 */
int usb_drv_req_set_address(int phone, usb_address_t old_address,
    usb_address_t new_address)
{
        /* Prepare the target. */
        usb_target_t target = {
                .address = old_address,
                .endpoint = 0
        };

        /* Prepare the setup packet. */
        usb_device_request_setup_packet_t setup_packet = {
                .request_type = 0,
                .request = USB_DEVREQ_SET_ADDRESS,
                .index = 0,
                .length = 0,
        };
        setup_packet.value = new_address;

        int rc = usb_drv_psync_control_write(phone, target,
            &setup_packet, sizeof(setup_packet), NULL, 0);

        return rc;
}

/** Retrieve device descriptor of connected USB device.
 *
 * @param[in] phone Open phone to HC driver.
 * @param[in] address Device USB address.
 * @param[out] descriptor Storage for the device descriptor.
 * @return Error code.
 * @retval EBADMEM @p descriptor is NULL.
 */
int usb_drv_req_get_device_descriptor(int phone, usb_address_t address,
    usb_standard_device_descriptor_t *descriptor)
{
        if (descriptor == NULL) {
                return EBADMEM;
        }

        /* Prepare the target. */
        usb_target_t target = {
                .address = address,
                .endpoint = 0
        };

        /* Prepare the setup packet. */
        usb_device_request_setup_packet_t setup_packet = {
                .request_type = 128,
                .request = USB_DEVREQ_GET_DESCRIPTOR,
                .index = 0,
                .length = sizeof(usb_standard_device_descriptor_t)
        };
        setup_packet.value_high = USB_DESCTYPE_DEVICE;
        setup_packet.value_low = 0;

        /* Prepare local descriptor. */
        size_t actually_transferred = 0;
        usb_standard_device_descriptor_t descriptor_tmp;

        /* Perform the control read transaction. */
        int rc = usb_drv_psync_control_read(phone, target,
            &setup_packet, sizeof(setup_packet),
            &descriptor_tmp, sizeof(descriptor_tmp), &actually_transferred);

        if (rc != EOK) {
                return rc;
        }

        /* Verify that all data has been transferred. */
        if (actually_transferred < sizeof(descriptor_tmp)) {
                return ELIMIT;
        }

        /* Everything is okay, copy the descriptor. */
        memcpy(descriptor, &descriptor_tmp,
            sizeof(descriptor_tmp));

        return EOK;
}



/**
 * @}
 */