/*********************************************
 * (2013) Benjamin Krill <benjamin@krll.de>
 *********************************************/
#include <stdlib.h>
#include <stdio.h>
#include <usb.h>
#include <string.h>
#include <endian.h>
#include <strm.h>

#define DEBUG 0

#if defined(DEBUG) && DEBUG == 1
	#define printf_dbg(fmt, args...) printf(fmt, ## args)
#else
	#define printf_dbg(args...)
#endif

static usb_dev_handle *hd = NULL;

/* TODO: extend to support multiple USB device on one host! */
static struct usb_device *
find_device(struct usb_bus* busses, int vendor, int product)
{
	struct usb_bus *bus;
	struct usb_device *dev;

	for (bus = busses; bus; bus = bus->next) {
		printf_dbg("scanning bus %s\n", bus->dirname);

		for (dev = bus->devices; dev; dev=dev->next) {
			/* compare device vendor and product */
			if ((dev->descriptor.idVendor == vendor) &&
			    (dev->descriptor.idProduct == product))	{
				/* print device information */
				printf_dbg("\tfound device %s bus %s (idVendor 0x%04x idProduct 0x%04x)\n",
				            dev->filename, dev->bus->dirname, dev->descriptor.idVendor,
				            dev->descriptor.idProduct);
				return dev;
			} else {
				printf_dbg("\tdevice %s does not match\n", dev->filename);
			}
		}
	}
	return NULL;
}

usb_dev_handle *
strm_init(int vendor, int product)
{
	struct usb_device *dev;

	usb_init();
	usb_find_busses();
	usb_find_devices();
	if ((dev = find_device(usb_get_busses(), vendor, product)) == NULL)
		return NULL;

	if (!(hd = usb_open(dev))) {
		printf("FAILED: cannot open device.\n");
		return NULL;
	}
	/* reset usb device */
	usb_reset(hd);
	printf_dbg("Lets do the magic (%p) ...\n", hd);

	return hd;
}

int
strm_fini(void)
{
	if (hd)
		usb_close(hd);
	hd = NULL;
	return 0;
}