dcdc-usb-comm.c

/* 
 * Copyright (c) 2011 by Mini-Box.com, iTuner Networks Inc.
 * Written by Nicu Pavel <npavel@mini-box.com>
 * All Rights Reserved
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
 
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

#include <usb.h>

#include "dcdc-usb.h"

#define P(t, v...) fprintf(stderr, t "\n", ##v)

int dcdc_send(struct usb_dev_handle *h, unsigned char *data, int size)
{
    if (data == NULL)
	return -1;

    return usb_interrupt_write(h, USB_ENDPOINT_OUT + 1, (char *) data, size, 1000);
}

int dcdc_recv(struct usb_dev_handle *h, unsigned char *data, int size, int timeout)
{
    if (data == NULL)
	return -1;

    return usb_interrupt_read(h, USB_ENDPOINT_IN + 1, (char *) data, size, timeout);
}

struct usb_dev_handle * dcdc_connect()
{
    struct usb_bus *b;
    struct usb_device *d;
    struct usb_dev_handle *h = NULL;
    
    usb_init();
    usb_set_debug(0);
    usb_find_busses();
    usb_find_devices();

    for (b = usb_get_busses(); b != NULL; b = b->next)
    {
	for (d = b->devices; d != NULL; d = d->next)
	{
	    if ((d->descriptor.idVendor == DCDC_VID) && 
	       (d->descriptor.idProduct == DCDC_PID))
	    {
		h = usb_open(d);
		break;
	    }
	}
    }
	return h;
}

int dcdc_setup(struct usb_dev_handle *h)
{
    char buf[65535];
    
    if (h == NULL)
	return -1;
	
    if (usb_get_driver_np(h, 0, buf, sizeof(buf)) == 0)
    {
	if (usb_detach_kernel_driver_np(h, 0) < 0)
	{
	    fprintf(stderr, "Cannot detach from kernel driver\n");
	    return -2;
	}
    }
    
    if (usb_set_configuration(h, 1) < 0)
    {
	fprintf(stderr, "Cannot set configuration 1 for the device\n");
	return -3;
    }
    
    usleep(1000);
    
    if (usb_claim_interface(h, 0) < 0)
    {
	fprintf(stderr, "Cannot claim interface 0\n");
	return -4;
    }

    if (usb_set_altinterface(h, 0) < 0)
    {
	fprintf(stderr, "Cannot set alternate configuration\n");
	return -5;
    }
    
    if (usb_control_msg(h, USB_TYPE_CLASS + USB_RECIP_INTERFACE, 
		0x000000a, 0x0000000, 0x0000000, buf, 0x0000000, 1000) 
	< 0)
    {
	fprintf(stderr, "Cannot send control message\n");
	return -6;
    }

    return 0;
}