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/*******************************************************

 HIDAPI - Multi-Platform library for

 communication with HID devices.

 Alan Ott

 Signal 11 Software

 8/22/2009

 Linux Version - 6/2/2010

 Libusb Version - 8/13/2010

 FreeBSD Version - 11/1/2011

 Copyright 2009, All Rights Reserved.

 At the discretion of the user of this library,

 this software may be licensed under the terms of the

 GNU Public License v3, a BSD-Style license, or the

 original HIDAPI license as outlined in the LICENSE.txt,

 LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt

 files located at the root of the source distribution.

 These files may also be found in the public source

 code repository located at:

        http://github.com/signal11/hidapi .

********************************************************/

#define _GNU_SOURCE /* needed for wcsdup() before glibc 2.10 */

/* C */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <ctype.h>

#include <locale.h>

#include <errno.h>

/* Unix */

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/ioctl.h>

#include <sys/utsname.h>

#include <fcntl.h>

#include <pthread.h>

#include <wchar.h>

/* GNU / LibUSB */

#include "libusb.h"

#include "iconv.h"

#include "hidapi.h"

#ifdef __cplusplus

extern "C" {

#endif

#ifdef DEBUG_PRINTF

#define LOG(...) fprintf(stderr, __VA_ARGS__)

#else

#define LOG(...) do {} while (0)

#endif

#ifndef __FreeBSD__

#define DETACH_KERNEL_DRIVER

#endif

/* Uncomment to enable the retrieval of Usage and Usage Page in

hid_enumerate(). Warning, on platforms different from FreeBSD

this is very invasive as it requires the detach

and re-attach of the kernel driver. See comments inside hid_enumerate().

libusb HIDAPI programs are encouraged to use the interface number

instead to differentiate between interfaces on a composite HID device. */

/*#define INVASIVE_GET_USAGE*/

/* Linked List of input reports received from the device. */

struct input_report {

	uint8_t *data;

	size_t len;

	struct input_report *next;

};

struct hid_device_ {

	/* Handle to the actual device. */

	libusb_device_handle *device_handle;

	/* Endpoint information */

	int input_endpoint;

	int output_endpoint;

	int input_ep_max_packet_size;

	/* The interface number of the HID */

	int interface;

	/* Indexes of Strings */

	int manufacturer_index;

	int product_index;

	int serial_index;

	/* Whether blocking reads are used */

	int blocking; /* boolean */

	/* Read thread objects */

	pthread_t thread;

	pthread_mutex_t mutex; /* Protects input_reports */

	pthread_cond_t condition;

	pthread_barrier_t barrier; /* Ensures correct startup sequence */

	int shutdown_thread;

	struct libusb_transfer *transfer;

	/* List of received input reports. */

	struct input_report *input_reports;

};

static libusb_context *usb_context = NULL;

uint16_t get_usb_code_for_current_locale(void);

static int return_data(hid_device *dev, unsigned char *data, size_t length);

static hid_device *new_hid_device(void)

{

	hid_device *dev = calloc(1, sizeof(hid_device));

	dev->blocking = 1;

	pthread_mutex_init(&dev->mutex, NULL);

	pthread_cond_init(&dev->condition, NULL);

	pthread_barrier_init(&dev->barrier, NULL, 2);

	return dev;

}

static void free_hid_device(hid_device *dev)

{

	/* Clean up the thread objects */

	pthread_barrier_destroy(&dev->barrier);

	pthread_cond_destroy(&dev->condition);

	pthread_mutex_destroy(&dev->mutex);

	/* Free the device itself */

	free(dev);

}

#if 0

/*TODO: Implement this funciton on hidapi/libusb.. */

static void register_error(hid_device *device, const char *op)

{

}

#endif

#ifdef INVASIVE_GET_USAGE

/* Get bytes from a HID Report Descriptor.

   Only call with a num_bytes of 0, 1, 2, or 4. */

static uint32_t get_bytes(uint8_t *rpt, size_t len, size_t num_bytes, size_t cur)

{

	/* Return if there aren't enough bytes. */

	if (cur + num_bytes >= len)

		return 0;

	if (num_bytes == 0)

		return 0;

	else if (num_bytes == 1) {

		return rpt[cur+1];

	}

	else if (num_bytes == 2) {

		return (rpt[cur+2] * 256 + rpt[cur+1]);

	}

	else if (num_bytes == 4) {

		return (rpt[cur+4] * 0x01000000 +

		        rpt[cur+3] * 0x00010000 +

		        rpt[cur+2] * 0x00000100 +

		        rpt[cur+1] * 0x00000001);

	}

	else

		return 0;

}

/* Retrieves the device's Usage Page and Usage from the report

   descriptor. The algorithm is simple, as it just returns the first

   Usage and Usage Page that it finds in the descriptor.

   The return value is 0 on success and -1 on failure. */

static int get_usage(uint8_t *report_descriptor, size_t size,

                     unsigned short *usage_page, unsigned short *usage)

{

	unsigned int i = 0;

	int size_code;

	int data_len, key_size;

	int usage_found = 0, usage_page_found = 0;

	while (i < size) {

		int key = report_descriptor[i];

		int key_cmd = key & 0xfc;

		//printf("key: %02hhx\n", key);

		if ((key & 0xf0) == 0xf0) {

			/* This is a Long Item. The next byte contains the

			   length of the data section (value) for this key.

			   See the HID specification, version 1.11, section

			   6.2.2.3, titled "Long Items." */

			if (i+1 < size)

				data_len = report_descriptor[i+1];

			else

				data_len = 0; /* malformed report */

			key_size = 3;

		}

		else {

			/* This is a Short Item. The bottom two bits of the

			   key contain the size code for the data section

			   (value) for this key.  Refer to the HID

			   specification, version 1.11, section 6.2.2.2,

			   titled "Short Items." */

			size_code = key & 0x3;

			switch (size_code) {

			case 0:

			case 1:

			case 2:

				data_len = size_code;

				break;

			case 3:

				data_len = 4;

				break;

			default:

				/* Can't ever happen since size_code is & 0x3 */

				data_len = 0;

				break;

			};

			key_size = 1;

		}

		if (key_cmd == 0x4) {

			*usage_page  = get_bytes(report_descriptor, size, data_len, i);

			usage_page_found = 1;

			//printf("Usage Page: %x\n", (uint32_t)*usage_page);

		}

		if (key_cmd == 0x8) {

			*usage = get_bytes(report_descriptor, size, data_len, i);

			usage_found = 1;

			//printf("Usage: %x\n", (uint32_t)*usage);

		}

		if (usage_page_found && usage_found)

			return 0; /* success */

		/* Skip over this key and it's associated data */

		i += data_len + key_size;

	}

	return -1; /* failure */

}

#endif /* INVASIVE_GET_USAGE */

#ifdef __FreeBSD__

/* The FreeBSD version of libusb doesn't have this funciton. In mainline

   libusb, it's inlined in libusb.h. This function will bear a striking

   resemblence to that one, because there's about one way to code it.

   Note that the data parameter is Unicode in UTF-16LE encoding.

   Return value is the number of bytes in data, or LIBUSB_ERROR_*.

 */

static inline int libusb_get_string_descriptor(libusb_device_handle *dev,

	uint8_t descriptor_index, uint16_t lang_id,

	unsigned char *data, int length)

{

	return libusb_control_transfer(dev,

		LIBUSB_ENDPOINT_IN | 0x0, /* Endpoint 0 IN */

		LIBUSB_REQUEST_GET_DESCRIPTOR,

		(LIBUSB_DT_STRING << 8) | descriptor_index,

		lang_id, data, (uint16_t) length, 1000);

}

#endif

/* Get the first language the device says it reports. This comes from

   USB string #0. */

static uint16_t get_first_language(libusb_device_handle *dev)

{

	uint16_t buf[32];

	int len;

	/* Get the string from libusb. */

	len = libusb_get_string_descriptor(dev,

			0x0, /* String ID */

			0x0, /* Language */

			(unsigned char*)buf,

			sizeof(buf));

	if (len < 4)

		return 0x0;

	return buf[1]; /* First two bytes are len and descriptor type. */

}

static int is_language_supported(libusb_device_handle *dev, uint16_t lang)

{

	uint16_t buf[32];

	int len;

	int i;

	/* Get the string from libusb. */

	len = libusb_get_string_descriptor(dev,

			0x0, /* String ID */

			0x0, /* Language */

			(unsigned char*)buf,

			sizeof(buf));

	if (len < 4)

		return 0x0;

	len /= 2; /* language IDs are two-bytes each. */

	/* Start at index 1 because there are two bytes of protocol data. */

	for (i = 1; i < len; i++) {

		if (buf[i] == lang)

			return 1;

	}

	return 0;

}

/* This function returns a newly allocated wide string containing the USB

   device string numbered by the index. The returned string must be freed

   by using free(). */

static wchar_t *get_usb_string(libusb_device_handle *dev, uint8_t idx)

{

	char buf[512];

	int len;

	wchar_t *str = NULL;

	wchar_t wbuf[256];

	/* iconv variables */

	iconv_t ic;

	size_t inbytes;

	size_t outbytes;

	size_t res;

#ifdef __FreeBSD__

	const char *inptr;

#else

	char *inptr;

#endif

	char *outptr;

	/* Determine which language to use. */

	uint16_t lang;

	lang = get_usb_code_for_current_locale();

	if (!is_language_supported(dev, lang))

		lang = get_first_language(dev);

	/* Get the string from libusb. */

	len = libusb_get_string_descriptor(dev,

			idx,

			lang,

			(unsigned char*)buf,

			sizeof(buf));

	if (len < 0)

		return NULL;

	/* buf does not need to be explicitly NULL-terminated because

	   it is only passed into iconv() which does not need it. */

	/* Initialize iconv. */

	ic = iconv_open("WCHAR_T", "UTF-16LE");

	if (ic == (iconv_t)-1) {

		LOG("iconv_open() failed\n");

		return NULL;

	}

	/* Convert to native wchar_t (UTF-32 on glibc/BSD systems).

	   Skip the first character (2-bytes). */

	inptr = buf+2;

	inbytes = len-2;

	outptr = (char*) wbuf;

	outbytes = sizeof(wbuf);

	res = iconv(ic, &inptr, &inbytes, &outptr, &outbytes);

	if (res == (size_t)-1) {

		LOG("iconv() failed\n");

		goto err;

	}

	/* Write the terminating NULL. */

	wbuf[sizeof(wbuf)/sizeof(wbuf[0])-1] = 0x00000000;

	if (outbytes >= sizeof(wbuf[0]))

		*((wchar_t*)outptr) = 0x00000000;

	/* Allocate and copy the string. */

	str = wcsdup(wbuf);

err:

	iconv_close(ic);

	return str;

}

static char *make_path(libusb_device *dev, int interface_number)

{

	char str[64];

	snprintf(str, sizeof(str), "%04x:%04x:%02x",

		libusb_get_bus_number(dev),

		libusb_get_device_address(dev),

		interface_number);

	str[sizeof(str)-1] = '\0';

	return strdup(str);

}

int HID_API_EXPORT hid_init(void)

{

	if (!usb_context) {

		const char *locale;

		/* Init Libusb */

		if (libusb_init(&usb_context))

			return -1;

		/* Set the locale if it's not set. */

		locale = setlocale(LC_CTYPE, NULL);

		if (!locale)

			setlocale(LC_CTYPE, "");

	}

	return 0;

}

int HID_API_EXPORT hid_exit(void)

{

	if (usb_context) {

		libusb_exit(usb_context);

		usb_context = NULL;

	}

	return 0;

}

struct hid_device_info  HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)

{

	libusb_device **devs;

	libusb_device *dev;

	libusb_device_handle *handle;

	ssize_t num_devs;

	int i = 0;

	struct hid_device_info *root = NULL; /* return object */

	struct hid_device_info *cur_dev = NULL;

	if(hid_init() < 0)

		return NULL;

	num_devs = libusb_get_device_list(usb_context, &devs);

	if (num_devs < 0)

		return NULL;

	while ((dev = devs[i++]) != NULL) {

		struct libusb_device_descriptor desc;

		struct libusb_config_descriptor *conf_desc = NULL;

		int j, k;

		int interface_num = 0;

		int res = libusb_get_device_descriptor(dev, &desc);

		unsigned short dev_vid = desc.idVendor;

		unsigned short dev_pid = desc.idProduct;

		res = libusb_get_active_config_descriptor(dev, &conf_desc);

		if (res < 0)

			libusb_get_config_descriptor(dev, 0, &conf_desc);

		if (conf_desc) {

			for (j = 0; j < conf_desc->bNumInterfaces; j++) {

				const struct libusb_interface *intf = &conf_desc->interface[j];

				for (k = 0; k < intf->num_altsetting; k++) {

					const struct libusb_interface_descriptor *intf_desc;

					intf_desc = &intf->altsetting[k];

					if (intf_desc->bInterfaceClass == LIBUSB_CLASS_HID) {

						interface_num = intf_desc->bInterfaceNumber;

						/* Check the VID/PID against the arguments */

						if ((vendor_id == 0x0 || vendor_id == dev_vid) &&

						    (product_id == 0x0 || product_id == dev_pid)) {

							struct hid_device_info *tmp;

							/* VID/PID match. Create the record. */

							tmp = calloc(1, sizeof(struct hid_device_info));

							if (cur_dev) {

								cur_dev->next = tmp;

							}

							else {

								root = tmp;

							}

							cur_dev = tmp;

							/* Fill out the record */

							cur_dev->next = NULL;

							cur_dev->path = make_path(dev, interface_num);

							res = libusb_open(dev, &handle);

							if (res >= 0) {

								/* Serial Number */

								if (desc.iSerialNumber > 0)

									cur_dev->serial_number =

										get_usb_string(handle, desc.iSerialNumber);

								/* Manufacturer and Product strings */

								if (desc.iManufacturer > 0)

									cur_dev->manufacturer_string =

										get_usb_string(handle, desc.iManufacturer);

								if (desc.iProduct > 0)

									cur_dev->product_string =

										get_usb_string(handle, desc.iProduct);

#ifdef INVASIVE_GET_USAGE

{

							/*

							This section is removed because it is too

							invasive on the system. Getting a Usage Page

							and Usage requires parsing the HID Report

							descriptor. Getting a HID Report descriptor

							involves claiming the interface. Claiming the

							interface involves detaching the kernel driver.

							Detaching the kernel driver is hard on the system

							because it will unclaim interfaces (if another

							app has them claimed) and the re-attachment of

							the driver will sometimes change /dev entry names.

							It is for these reasons that this section is

							#if 0. For composite devices, use the interface

							field in the hid_device_info struct to distinguish

							between interfaces. */

								unsigned char data[256];

#ifdef DETACH_KERNEL_DRIVER

								int detached = 0;

								/* Usage Page and Usage */

								res = libusb_kernel_driver_active(handle, interface_num);

								if (res == 1) {

									res = libusb_detach_kernel_driver(handle, interface_num);

									if (res < 0)

										LOG("Couldn't detach kernel driver, even though a kernel driver was attached.");

									else

										detached = 1;

								}

#endif

								res = libusb_claim_interface(handle, interface_num);

								if (res >= 0) {

									/* Get the HID Report Descriptor. */

									res = libusb_control_transfer(handle, LIBUSB_ENDPOINT_IN|LIBUSB_RECIPIENT_INTERFACE, LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_REPORT << 8)|interface_num, 0, data, sizeof(data), 5000);

									if (res >= 0) {

										unsigned short page=0, usage=0;

										/* Parse the usage and usage page

										   out of the report descriptor. */

										get_usage(data, res,  &page, &usage);

										cur_dev->usage_page = page;

										cur_dev->usage = usage;

									}

									else

										LOG("libusb_control_transfer() for getting the HID report failed with %d\n", res);

									/* Release the interface */

									res = libusb_release_interface(handle, interface_num);

									if (res < 0)

										LOG("Can't release the interface.\n");

								}

								else

									LOG("Can't claim interface %d\n", res);

#ifdef DETACH_KERNEL_DRIVER

								/* Re-attach kernel driver if necessary. */

								if (detached) {

									res = libusb_attach_kernel_driver(handle, interface_num);

									if (res < 0)

										LOG("Couldn't re-attach kernel driver.\n");

								}

#endif

}

#endif /* INVASIVE_GET_USAGE */

								libusb_close(handle);

							}

							/* VID/PID */

							cur_dev->vendor_id = dev_vid;

							cur_dev->product_id = dev_pid;

							/* Release Number */

							cur_dev->release_number = desc.bcdDevice;

							/* Interface Number */

							cur_dev->interface_number = interface_num;

						}

					}

				} /* altsettings */

			} /* interfaces */

			libusb_free_config_descriptor(conf_desc);

		}

	}

	libusb_free_device_list(devs, 1);

	return root;

}

void  HID_API_EXPORT hid_free_enumeration(struct hid_device_info *devs)

{

	struct hid_device_info *d = devs;

	while (d) {

		struct hid_device_info *next = d->next;

		free(d->path);

		free(d->serial_number);

		free(d->manufacturer_string);

		free(d->product_string);

		free(d);

		d = next;

	}

}

hid_device * hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number)

{

	struct hid_device_info *devs, *cur_dev;

	const char *path_to_open = NULL;

	hid_device *handle = NULL;

	devs = hid_enumerate(vendor_id, product_id);

	cur_dev = devs;

	while (cur_dev) {

		if (cur_dev->vendor_id == vendor_id &&

		    cur_dev->product_id == product_id) {

			if (serial_number) {

				if (wcscmp(serial_number, cur_dev->serial_number) == 0) {

					path_to_open = cur_dev->path;

					break;

				}

			}

			else {

				path_to_open = cur_dev->path;

				break;

			}

		}

		cur_dev = cur_dev->next;

	}

	if (path_to_open) {

		/* Open the device */

		handle = hid_open_path(path_to_open);

	}

	hid_free_enumeration(devs);

	return handle;

}

static void read_callback(struct libusb_transfer *transfer)

{

	hid_device *dev = transfer->user_data;

	int res;

	if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {

		struct input_report *rpt = malloc(sizeof(*rpt));

		rpt->data = malloc(transfer->actual_length);

		memcpy(rpt->data, transfer->buffer, transfer->actual_length);

		rpt->len = transfer->actual_length;

		rpt->next = NULL;

		pthread_mutex_lock(&dev->mutex);

		/* Attach the new report object to the end of the list. */

		if (dev->input_reports == NULL) {

			/* The list is empty. Put it at the root. */

			dev->input_reports = rpt;

			pthread_cond_signal(&dev->condition);

		}

		else {

			/* Find the end of the list and attach. */

			struct input_report *cur = dev->input_reports;

			int num_queued = 0;

			while (cur->next != NULL) {

				cur = cur->next;

				num_queued++;

			}

			cur->next = rpt;

			/* Pop one off if we've reached 30 in the queue. This

			   way we don't grow forever if the user never reads

			   anything from the device. */

			if (num_queued > 30) {

				return_data(dev, NULL, 0);

			}

		}

		pthread_mutex_unlock(&dev->mutex);

	}

	else if (transfer->status == LIBUSB_TRANSFER_CANCELLED) {

		dev->shutdown_thread = 1;

		return;

	}

	else if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {

		dev->shutdown_thread = 1;

		return;

	}

	else if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT) {

		//LOG("Timeout (normal)\n");

	}

	else {

		LOG("Unknown transfer code: %d\n", transfer->status);

	}

	/* Re-submit the transfer object. */

	res = libusb_submit_transfer(transfer);

	if (res != 0) {

		LOG("Unable to submit URB. libusb error code: %d\n", res);

		dev->shutdown_thread = 1;

	}

}

static void *read_thread(void *param)

{

	hid_device *dev = param;

	unsigned char *buf;

	const size_t length = dev->input_ep_max_packet_size;

	/* Set up the transfer object. */

	buf = malloc(length);

	dev->transfer = libusb_alloc_transfer(0);

	libusb_fill_interrupt_transfer(dev->transfer,

		dev->device_handle,

		dev->input_endpoint,

		buf,

		length,

		read_callback,

		dev,

		5000/*timeout*/);

	/* Make the first submission. Further submissions are made

	   from inside read_callback() */

	libusb_submit_transfer(dev->transfer);

	/* Notify the main thread that the read thread is up and running. */

	pthread_barrier_wait(&dev->barrier);

	/* Handle all the events. */

	while (!dev->shutdown_thread) {

		int res;

		res = libusb_handle_events(usb_context);

		if (res < 0) {

			/* There was an error. */

			LOG("read_thread(): libusb reports error # %d\n", res);

			/* Break out of this loop only on fatal error.*/

			if (res != LIBUSB_ERROR_BUSY &&

			    res != LIBUSB_ERROR_TIMEOUT &&

			    res != LIBUSB_ERROR_OVERFLOW &&

			    res != LIBUSB_ERROR_INTERRUPTED) {

				break;

			}

		}

	}

	/* Cancel any transfer that may be pending. This call will fail

	   if no transfers are pending, but that's OK. */

	if (libusb_cancel_transfer(dev->transfer) == 0) {

		/* The transfer was cancelled, so wait for its completion. */

		libusb_handle_events(usb_context);

	}

	/* Now that the read thread is stopping, Wake any threads which are

	   waiting on data (in hid_read_timeout()). Do this under a mutex to

	   make sure that a thread which is about to go to sleep waiting on

	   the condition acutally will go to sleep before the condition is

	   signaled. */

	pthread_mutex_lock(&dev->mutex);

	pthread_cond_broadcast(&dev->condition);

	pthread_mutex_unlock(&dev->mutex);

	/* The dev->transfer->buffer and dev->transfer objects are cleaned up

	   in hid_close(). They are not cleaned up here because this thread

	   could end either due to a disconnect or due to a user

	   call to hid_close(). In both cases the objects can be safely

	   cleaned up after the call to pthread_join() (in hid_close()), but

	   since hid_close() calls libusb_cancel_transfer(), on these objects,

	   they can not be cleaned up here. */

	return NULL;

}

hid_device * HID_API_EXPORT hid_open_path(const char *path)

{

	hid_device *dev = NULL;

	libusb_device **devs;

	libusb_device *usb_dev;

	int res;

	int d = 0;

	int good_open = 0;

	dev = new_hid_device();

	if(hid_init() < 0)

		return NULL;

	libusb_get_device_list(usb_context, &devs);

	while ((usb_dev = devs[d++]) != NULL) {

		struct libusb_device_descriptor desc;

		struct libusb_config_descriptor *conf_desc = NULL;

		int i,j,k;

		libusb_get_device_descriptor(usb_dev, &desc);

		if (libusb_get_active_config_descriptor(usb_dev, &conf_desc) < 0)

			continue;

		for (j = 0; j < conf_desc->bNumInterfaces; j++) {

			const struct libusb_interface *intf = &conf_desc->interface[j];

			for (k = 0; k < intf->num_altsetting; k++) {

				const struct libusb_interface_descriptor *intf_desc;

				intf_desc = &intf->altsetting[k];

				if (intf_desc->bInterfaceClass == LIBUSB_CLASS_HID) {

					char *dev_path = make_path(usb_dev, intf_desc->bInterfaceNumber);

					if (!strcmp(dev_path, path)) {

						/* Matched Paths. Open this device */

						/* OPEN HERE */

						res = libusb_open(usb_dev, &dev->device_handle);

						if (res < 0) {

							LOG("can't open device\n");

							free(dev_path);

							break;

						}

						good_open = 1;

#ifdef DETACH_KERNEL_DRIVER

						/* Detach the kernel driver, but only if the

						   device is managed by the kernel */

						if (libusb_kernel_driver_active(dev->device_handle, intf_desc->bInterfaceNumber) == 1) {

							res = libusb_detach_kernel_driver(dev->device_handle, intf_desc->bInterfaceNumber);

							if (res < 0) {

								libusb_close(dev->device_handle);

								LOG("Unable to detach Kernel Driver\n");

								free(dev_path);

								good_open = 0;

								break;

							}

						}

#endif

						res = libusb_claim_interface(dev->device_handle, intf_desc->bInterfaceNumber);

						if (res < 0) {

							LOG("can't claim interface %d: %d\n", intf_desc->bInterfaceNumber, res);

							free(dev_path);

							libusb_close(dev->device_handle);

							good_open = 0;

							break;

						}

						/* Store off the string descriptor indexes */

						dev->manufacturer_index = desc.iManufacturer;

						dev->product_index      = desc.iProduct;

						dev->serial_index       = desc.iSerialNumber;

						/* Store off the interface number */

						dev->interface = intf_desc->bInterfaceNumber;

						/* Find the INPUT and OUTPUT endpoints. An

						   OUTPUT endpoint is not required. */

						for (i = 0; i < intf_desc->bNumEndpoints; i++) {

							const struct libusb_endpoint_descriptor *ep

								= &intf_desc->endpoint[i];