[hmcfgusb] / hmcfgusb.c

/* HM-CFG-USB libusb-driver
 *
 * Copyright (c) 2013-16 Michael Gernoth <michael@gernoth.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#include <poll.h>
#include <errno.h>
#include <sys/time.h>
#include <libusb-1.0/libusb.h>

/* Workaround for old libusb-1.0 */
#ifndef LIBUSB_CALL
#define LIBUSB_CALL
#define libusb_handle_events_timeout_completed(ctx, tv, x) libusb_handle_events_timeout(ctx, tv)
#endif

#include "hexdump.h"
#include "hmcfgusb.h"

#define USB_TIMEOUT	10000

#define ID_VENDOR	0x1b1f
#define ID_PRODUCT	0xc00f
#define ID_PRODUCT_BL	0xc010

/* TODO: dynamic */
#define ASYNC_SIZE	0x0040
#define ASYNC_INTERVAL	32

#define EP_OUT		0x02
#define EP_IN		0x83

#define INTERFACE	0

static int quit = 0;
static int debug = 0;
static int libusb_initialized = 0;

/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
static char * usb_strerror(int e)
{
	static char unknerr[256];

	switch (e) {
		case LIBUSB_SUCCESS:
			return "Success";
		case LIBUSB_ERROR_IO:
			return "Input/output error";
		case LIBUSB_ERROR_INVALID_PARAM:
			return "Invalid parameter";
		case LIBUSB_ERROR_ACCESS:
			return "Access denied (insufficient permissions)";
		case LIBUSB_ERROR_NO_DEVICE:
			return "No such device (it may have been disconnected)";
		case LIBUSB_ERROR_NOT_FOUND:
			return "Entity not found";
		case LIBUSB_ERROR_BUSY:
			return "Resource busy";
		case LIBUSB_ERROR_TIMEOUT:
			return "Operation timed out";
		case LIBUSB_ERROR_OVERFLOW:
			return "Overflow";
		case LIBUSB_ERROR_PIPE:
			return "Pipe error";
		case LIBUSB_ERROR_INTERRUPTED:
			return "System call interrupted (perhaps due to signal)";
		case LIBUSB_ERROR_NO_MEM:
			return "Insufficient memory";
		case LIBUSB_ERROR_NOT_SUPPORTED:
			return "Operation not supported or unimplemented on this platform";
		case LIBUSB_ERROR_OTHER:
			return "Other error";
	};
	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	return unknerr;
}

static libusb_device_handle *hmcfgusb_find(int vid, int pid, char *serial) {
	libusb_device_handle *devh = NULL;
	libusb_device **list;
	ssize_t cnt;
	ssize_t i;
	int err;

	cnt = libusb_get_device_list(NULL, &list);
	if (cnt < 0) {
		fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
		return NULL;
	}

	for (i = 0; i < cnt; i++){
		struct libusb_device_descriptor desc;

		err = libusb_get_device_descriptor(list[i], &desc);
		if (err)
			continue;

		if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
			libusb_device *dev = list[i];

			err = libusb_open(dev, &devh);
			if (err) {
				fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
				libusb_free_device_list(list, 1);
				return NULL;
			}

			if (serial) {
				if (desc.iSerialNumber > 0) {
					uint8_t devSerial[256];
					err = libusb_get_string_descriptor_ascii(devh, desc.iSerialNumber, devSerial, sizeof(devSerial));
					if (err < 0) {
						fprintf(stderr, "Can't read serial-number: %s\n", usb_strerror(err));
						libusb_close(devh);
						libusb_free_device_list(list, 1);
						return NULL;
					}
					if (strcmp((char*)devSerial, (char*)serial)) {
						libusb_close(devh);
						continue;
					}
				} else {
					libusb_close(devh);
					continue;
				}
			}

			err = libusb_detach_kernel_driver(devh, INTERFACE);
			if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
				fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
				libusb_close(devh);
				libusb_free_device_list(list, 1);
				return NULL;
			}

			err = libusb_claim_interface(devh, INTERFACE);
			if ((err != 0)) {
				fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
				libusb_close(devh);
				libusb_free_device_list(list, 1);
				return NULL;
			}

			libusb_free_device_list(list, 0);
			return devh;
		}

	}

	libusb_free_device_list(list, 1);
	return NULL;
}

int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
{
	int err;
	int cnt;
	unsigned char out[0x40];

	memset(out, 0, sizeof(out));

	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
	if (err && (!silent)) {
		fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
		return 0;
	}

	return 1;
}

int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done)
{
	int err;
	int cnt;
	struct timeval tv_start, tv_end;
	int msec;

	if (debug) {
		hexdump(send_data, len, "USB < ");
	}

	gettimeofday(&tv_start, NULL);

	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	if (err) {
		fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
		return 0;
	}

	if (done) {
		if (!hmcfgusb_send_null_frame(usbdev, 0)) {
			return 0;
		}
	}

	gettimeofday(&tv_end, NULL);
	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);

	if (msec > 100) {
		fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
	} else if (debug) {
		fprintf(stderr, "usb-transfer took %dms!\n", msec);
	}

	return 1;
}

static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data, int in_size)
{
	unsigned char *data_buf;
	struct libusb_transfer *transfer;
	int err;

	data_buf = malloc(in_size);
	if (!data_buf) {
		fprintf(stderr, "Can't allocate memory for data-buffer!\n");
		return NULL;
	}

	transfer = libusb_alloc_transfer(0);
	if (!transfer) {
		fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
		free(data_buf);
		return NULL;
	}

	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
			data_buf, in_size, cb, data, USB_TIMEOUT);

	transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;

	err = libusb_submit_transfer(transfer);
	if (err != 0) {
		fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
		libusb_free_transfer(transfer);
		return NULL;
	}

	return transfer;
}

struct hmcfgusb_cb_data {
	struct hmcfgusb_dev *dev;
	hmcfgusb_cb_fn cb;
	void *data;
};

static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
{
	int err;
	struct hmcfgusb_cb_data *cb_data;

	cb_data = transfer->user_data;

	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
		if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
			if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
				fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));

			quit = EIO;
			goto out;
		}
	} else {
		if (cb_data && cb_data->cb) {
			if (debug)
				hexdump(transfer->buffer, transfer->actual_length, "USB > ");

			if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
				quit = EIO;
				goto out;
			}
		} else {
			hexdump(transfer->buffer, transfer->actual_length, "> ");
		}
	}

	err = libusb_submit_transfer(transfer);
	if (err != 0) {
		fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
		goto out;
	}

	return;

out:
	libusb_free_transfer(transfer);
	if (cb_data) {
		if (cb_data->dev && cb_data->dev->transfer) {
			cb_data->dev->transfer = NULL;
		}
		free(cb_data);
	}
}

struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data, char *serial)
{
	libusb_device_handle *devh = NULL;
	const struct libusb_pollfd **usb_pfd = NULL;
	struct hmcfgusb_dev *dev = NULL;
	struct hmcfgusb_cb_data *cb_data = NULL;
	int bootloader = 0;
	int err;
	int i;

	if (!libusb_initialized) {
		err = libusb_init(NULL);
		if (err != 0) {
			fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
			return NULL;
		}
	}
	libusb_initialized = 1;

	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT, serial);
	if (!devh) {
		devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL, serial);
		if (!devh) {
			if (serial) {
				fprintf(stderr, "Can't find/open HM-CFG-USB with serial %s!\n", serial);
			} else {
				fprintf(stderr, "Can't find/open HM-CFG-USB!\n");
			}
#ifdef NEED_LIBUSB_EXIT
			hmcfgusb_exit();
#endif
			return NULL;
		}
		bootloader = 1;
	}

	dev = malloc(sizeof(struct hmcfgusb_dev));
	if (!dev) {
		perror("Can't allocate memory for hmcfgusb_dev");
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	dev->usb_devh = devh;
	dev->bootloader = bootloader;
	dev->opened_at = time(NULL);

	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	if (!cb_data) {
		perror("Can't allocate memory for hmcfgusb_cb_data");
		free(dev);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));

	cb_data->dev = dev;
	cb_data->cb = cb;
	cb_data->data = data;

	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data, ASYNC_SIZE);

	if (!dev->transfer) {
		fprintf(stderr, "Can't prepare async device io!\n");
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	usb_pfd = libusb_get_pollfds(NULL);
	if (!usb_pfd) {
		fprintf(stderr, "Can't get FDset from libusb!\n");
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	dev->n_usb_pfd = 0;
	for(i = 0; usb_pfd[i]; i++)
		dev->n_usb_pfd++;

	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	if (!dev->pfd) {
		perror("Can't allocate memory for poll-fds");
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));

	for (i = 0; i < dev->n_usb_pfd; i++) {
		dev->pfd[i].fd = usb_pfd[i]->fd;
		dev->pfd[i].events = usb_pfd[i]->events;
		dev->pfd[i].revents = 0;
	}

	free(usb_pfd);

	dev->n_pfd = dev->n_usb_pfd;

	quit = 0;

	return dev;
}

int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
{
	dev->n_pfd++;
	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	if (!dev->pfd) {
		perror("Can't realloc poll-fds");
		return 0;
	}

	dev->pfd[dev->n_pfd-1].fd = fd;
	dev->pfd[dev->n_pfd-1].events = events;
	dev->pfd[dev->n_pfd-1].revents = 0;

	return 1;
}

int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
{
	struct timeval tv;
	int usb_event = 0;
	int timed_out = 0;
	int i;
	int n;
	int fd_n;
	int err;

	errno = 0;

	memset(&tv, 0, sizeof(tv));
	err = libusb_get_next_timeout(NULL, &tv);
	if (err < 0) {
		fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
		errno = EIO;
		return -1;
	} else if (err == 0) {
		/* No pending timeout or a sane platform */
	} else {
		if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
			usb_event = 1;
		} else if ((tv.tv_sec * 1000) < timeout) {
			timeout = tv.tv_sec * 1000;
		}
	}

	if (!usb_event) {
		for (i = 0; i < dev->n_pfd; i++) {
			dev->pfd[i].revents = 0;
		}

		n = poll(dev->pfd, dev->n_pfd, timeout);
		if (n < 0) {
			perror("poll");
			errno = 0;
			return -1;
		} else if (n == 0) {
			usb_event = 1;
			timed_out = 1;
		} else {
			for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
				if (dev->pfd[fd_n].revents) {
					if (fd_n < dev->n_usb_pfd) {
						usb_event = 1;
						break;
					} else {
						errno = 0;
						return dev->pfd[fd_n].fd;
					}
				}
			}
		}
	}

	if (usb_event) {
		memset(&tv, 0, sizeof(tv));
		err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
		if (err < 0) {
			fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
			errno = EIO;
			return -1;
		}
	}

	errno = 0;
	if (quit) {
		fprintf(stderr, "closing device-connection due to error %d\n", quit);
		errno = quit;
	}

	if (timed_out)
		errno = ETIMEDOUT;

	return -1;
}

void hmcfgusb_enter_bootloader(struct hmcfgusb_dev *dev)
{
	uint8_t out[ASYNC_SIZE];

	if (dev->bootloader) {
		fprintf(stderr, "request for bootloader mode, but device already in bootloader!\n");
		return;
	}

	memset(out, 0, sizeof(out));
	out[0] = 'B';
	hmcfgusb_send(dev, out, sizeof(out), 1);

	return;
}

void hmcfgusb_leave_bootloader(struct hmcfgusb_dev *dev)
{
	uint8_t out[ASYNC_SIZE];

	if (!dev->bootloader) {
		fprintf(stderr, "request for leaving bootloader mode, but device already in normal mode!\n");
		return;
	}

	memset(out, 0, sizeof(out));
	out[0] = 'K';
	hmcfgusb_send(dev, out, sizeof(out), 1);

	return;
}

void hmcfgusb_close(struct hmcfgusb_dev *dev)
{
	int err;

	if (dev->transfer) {
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
	}

	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	if ((err != 0)) {
		fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	}

	libusb_close(dev->usb_devh);
#ifdef NEED_LIBUSB_EXIT
	hmcfgusb_exit();
#endif
	free(dev->pfd);
	free(dev);
}

void hmcfgusb_exit(void)
{
	if (libusb_initialized) {
		libusb_exit(NULL);
		libusb_initialized = 0;
	}
}

void hmcfgusb_set_debug(int d)
{
	debug = d;
}
Commit	Line	Data
9db2e455 MG	1	/* HM-CFG-USB libusb-driver
9db2e455 MG	2	*
7ba4ea19	3	* Copyright (c) 2013-16 Michael Gernoth <michael@gernoth.net>
9db2e455 MG	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a copy
	6	* of this software and associated documentation files (the "Software"), to
	7	* deal in the Software without restriction, including without limitation the
	8	* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
	9	* sell copies of the Software, and to permit persons to whom the Software is
	10	* furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice shall be included in
	13	* all copies or substantial portions of the Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	21	* IN THE SOFTWARE.
	22	*/
	23
	24	#include <string.h>
	25	#include <stdio.h>
	26	#include <stdint.h>
	27	#include <unistd.h>
	28	#include <stdlib.h>
	29	#include <math.h>
	30	#include <poll.h>
	31	#include <errno.h>
f8718b41	32	#include <sys/time.h>
9db2e455 MG	33	#include <libusb-1.0/libusb.h>
9db2e455 MG	34
37c97e62 MG	35	/* Workaround for old libusb-1.0 */
	36	#ifndef LIBUSB_CALL
	37	#define LIBUSB_CALL
	38	#define libusb_handle_events_timeout_completed(ctx, tv, x) libusb_handle_events_timeout(ctx, tv)
	39	#endif
	40
9db2e455 MG	41	#include "hexdump.h"
	42	#include "hmcfgusb.h"
	43
813afd12	44	#define USB_TIMEOUT 10000
9db2e455 MG	45
	46	#define ID_VENDOR 0x1b1f
	47	#define ID_PRODUCT 0xc00f
4d0be794	48	#define ID_PRODUCT_BL 0xc010
9db2e455 MG	49
	50	/* TODO: dynamic */
	51	#define ASYNC_SIZE 0x0040
	52	#define ASYNC_INTERVAL 32
	53
	54	#define EP_OUT 0x02
	55	#define EP_IN 0x83
	56
813afd12 MG	57	#define INTERFACE 0
813afd12 MG	58
9db2e455	59	static int quit = 0;
e75295bb	60	static int debug = 0;
018f85fa	61	static int libusb_initialized = 0;
9db2e455 MG	62
	63	/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
	64	static char * usb_strerror(int e)
	65	{
	66	static char unknerr[256];
	67
	68	switch (e) {
	69	case LIBUSB_SUCCESS:
	70	return "Success";
	71	case LIBUSB_ERROR_IO:
	72	return "Input/output error";
	73	case LIBUSB_ERROR_INVALID_PARAM:
	74	return "Invalid parameter";
	75	case LIBUSB_ERROR_ACCESS:
	76	return "Access denied (insufficient permissions)";
	77	case LIBUSB_ERROR_NO_DEVICE:
	78	return "No such device (it may have been disconnected)";
	79	case LIBUSB_ERROR_NOT_FOUND:
	80	return "Entity not found";
	81	case LIBUSB_ERROR_BUSY:
	82	return "Resource busy";
	83	case LIBUSB_ERROR_TIMEOUT:
	84	return "Operation timed out";
	85	case LIBUSB_ERROR_OVERFLOW:
	86	return "Overflow";
	87	case LIBUSB_ERROR_PIPE:
	88	return "Pipe error";
	89	case LIBUSB_ERROR_INTERRUPTED:
	90	return "System call interrupted (perhaps due to signal)";
	91	case LIBUSB_ERROR_NO_MEM:
	92	return "Insufficient memory";
	93	case LIBUSB_ERROR_NOT_SUPPORTED:
	94	return "Operation not supported or unimplemented on this platform";
	95	case LIBUSB_ERROR_OTHER:
	96	return "Other error";
	97	};
	98	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	99	return unknerr;
	100	}
	101
f51714be	102	static libusb_device_handle hmcfgusb_find(int vid, int pid, char serial) {
9db2e455 MG	103	libusb_device_handle *devh = NULL;
	104	libusb_device **list;
	105	ssize_t cnt;
	106	ssize_t i;
	107	int err;
	108
	109	cnt = libusb_get_device_list(NULL, &list);
	110	if (cnt < 0) {
	111	fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
	112	return NULL;
	113	}
	114
	115	for (i = 0; i < cnt; i++){
	116	struct libusb_device_descriptor desc;
	117
	118	err = libusb_get_device_descriptor(list[i], &desc);
	119	if (err)
	120	continue;
	121
62f25bae	122	if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
9db2e455 MG	123	libusb_device *dev = list[i];
	124
	125	err = libusb_open(dev, &devh);
	126	if (err) {
	127	fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
018f85fa	128	libusb_free_device_list(list, 1);
9db2e455 MG	129	return NULL;
	130	}
	131
f51714be MG	132	if (serial) {
	133	if (desc.iSerialNumber > 0) {
	134	uint8_t devSerial[256];
	135	err = libusb_get_string_descriptor_ascii(devh, desc.iSerialNumber, devSerial, sizeof(devSerial));
	136	if (err < 0) {
	137	fprintf(stderr, "Can't read serial-number: %s\n", usb_strerror(err));
	138	libusb_close(devh);
	139	libusb_free_device_list(list, 1);
	140	return NULL;
	141	}
	142	if (strcmp((char)devSerial, (char)serial)) {
	143	libusb_close(devh);
	144	continue;
	145	}
	146	} else {
	147	libusb_close(devh);
	148	continue;
	149	}
	150	}
	151
813afd12	152	err = libusb_detach_kernel_driver(devh, INTERFACE);
9db2e455 MG	153	if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
9db2e455 MG	154	fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
018f85fa MG	155	libusb_close(devh);
018f85fa MG	156	libusb_free_device_list(list, 1);
9db2e455 MG	157	return NULL;
	158	}
	159
813afd12	160	err = libusb_claim_interface(devh, INTERFACE);
9db2e455 MG	161	if ((err != 0)) {
9db2e455 MG	162	fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
018f85fa MG	163	libusb_close(devh);
018f85fa MG	164	libusb_free_device_list(list, 1);
9db2e455 MG	165	return NULL;
	166	}
	167
018f85fa	168	libusb_free_device_list(list, 0);
9db2e455 MG	169	return devh;
	170	}
	171
	172	}
	173
018f85fa	174	libusb_free_device_list(list, 1);
9db2e455 MG	175	return NULL;
	176	}
	177
6262005e	178	int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
2a6eaefc MG	179	{
	180	int err;
	181	int cnt;
3435bdb6	182	unsigned char out[0x40];
2a6eaefc	183
3435bdb6 MG	184	memset(out, 0, sizeof(out));
3435bdb6 MG	185
3d5b8e70	186	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
6262005e MG	187	if (err && (!silent)) {
6262005e MG	188	fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
2a6eaefc MG	189	return 0;
	190	}
	191
	192	return 1;
	193	}
	194
9db2e455 MG	195	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	196	{
	197	int err;
	198	int cnt;
f8718b41 MG	199	struct timeval tv_start, tv_end;
f8718b41 MG	200	int msec;
9db2e455	201
f8718b41	202	if (debug) {
627e3f33	203	hexdump(send_data, len, "USB < ");
f8718b41 MG	204	}
f8718b41 MG	205
d200d8ca MG	206	gettimeofday(&tv_start, NULL);
d200d8ca MG	207
9db2e455 MG	208	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	209	if (err) {
	210	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	211	return 0;
	212	}
	213
	214	if (done) {
6262005e	215	if (!hmcfgusb_send_null_frame(usbdev, 0)) {
9db2e455 MG	216	return 0;
	217	}
	218	}
	219
d200d8ca MG	220	gettimeofday(&tv_end, NULL);
	221	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
	222
	223	if (msec > 100) {
6df7655e	224	fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
d200d8ca MG	225	} else if (debug) {
d200d8ca MG	226	fprintf(stderr, "usb-transfer took %dms!\n", msec);
f8718b41 MG	227	}
f8718b41 MG	228
e0a7146e	229	return 1;
9db2e455 MG	230	}
9db2e455 MG	231
b5e57d26	232	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data, int in_size)
9db2e455 MG	233	{
	234	unsigned char *data_buf;
	235	struct libusb_transfer *transfer;
	236	int err;
	237
b5e57d26	238	data_buf = malloc(in_size);
9db2e455 MG	239	if (!data_buf) {
	240	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	241	return NULL;
	242	}
	243
	244	transfer = libusb_alloc_transfer(0);
	245	if (!transfer) {
	246	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	247	free(data_buf);
	248	return NULL;
	249	}
	250
	251	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
b5e57d26	252	data_buf, in_size, cb, data, USB_TIMEOUT);
9db2e455	253
bafd75c9	254	transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	255
	256	err = libusb_submit_transfer(transfer);
	257	if (err != 0) {
	258	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	259	libusb_free_transfer(transfer);
9db2e455 MG	260	return NULL;
	261	}
	262
	263	return transfer;
	264	}
	265
	266	struct hmcfgusb_cb_data {
813afd12	267	struct hmcfgusb_dev *dev;
9db2e455 MG	268	hmcfgusb_cb_fn cb;
	269	void *data;
	270	};
	271
	272	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	273	{
	274	int err;
	275	struct hmcfgusb_cb_data *cb_data;
	276
813afd12 MG	277	cb_data = transfer->user_data;
813afd12 MG	278
9db2e455 MG	279	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
9db2e455 MG	280	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
018f85fa MG	281	if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
	282	fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
	283
9db2e455	284	quit = EIO;
1c346883	285	goto out;
9db2e455	286	}
9db2e455	287	} else {
27bb301b	288	if (cb_data && cb_data->cb) {
e0a7146e	289	if (debug)
627e3f33	290	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	291
	292	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	293	quit = EIO;
1c346883	294	goto out;
4371275b	295	}
27bb301b	296	} else {
e0a7146e	297	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	298	}
9db2e455 MG	299	}
	300
	301	err = libusb_submit_transfer(transfer);
	302	if (err != 0) {
	303	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
1c346883 MG	304	goto out;
	305	}
	306
	307	return;
	308
	309	out:
	310	libusb_free_transfer(transfer);
	311	if (cb_data) {
	312	if (cb_data->dev && cb_data->dev->transfer) {
	313	cb_data->dev->transfer = NULL;
325ed703	314	}
1c346883	315	free(cb_data);
9db2e455 MG	316	}
	317	}
	318
f51714be	319	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data, char *serial)
9db2e455 MG	320	{
	321	libusb_device_handle *devh = NULL;
	322	const struct libusb_pollfd **usb_pfd = NULL;
	323	struct hmcfgusb_dev *dev = NULL;
	324	struct hmcfgusb_cb_data *cb_data = NULL;
62f25bae	325	int bootloader = 0;
9db2e455 MG	326	int err;
	327	int i;
	328
018f85fa MG	329	if (!libusb_initialized) {
	330	err = libusb_init(NULL);
	331	if (err != 0) {
	332	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	333	return NULL;
	334	}
9db2e455	335	}
018f85fa	336	libusb_initialized = 1;
9db2e455	337
f51714be	338	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT, serial);
9db2e455	339	if (!devh) {
f51714be	340	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL, serial);
62f25bae	341	if (!devh) {
f51714be MG	342	if (serial) {
	343	fprintf(stderr, "Can't find/open HM-CFG-USB with serial %s!\n", serial);
	344	} else {
	345	fprintf(stderr, "Can't find/open HM-CFG-USB!\n");
	346	}
018f85fa MG	347	#ifdef NEED_LIBUSB_EXIT
	348	hmcfgusb_exit();
	349	#endif
62f25bae MG	350	return NULL;
	351	}
	352	bootloader = 1;
9db2e455 MG	353	}
	354
	355	dev = malloc(sizeof(struct hmcfgusb_dev));
	356	if (!dev) {
	357	perror("Can't allocate memory for hmcfgusb_dev");
211fd7e5	358	libusb_close(devh);
018f85fa MG	359	#ifdef NEED_LIBUSB_EXIT
	360	hmcfgusb_exit();
	361	#endif
9db2e455 MG	362	return NULL;
	363	}
	364
	365	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	366	dev->usb_devh = devh;
62f25bae MG	367	dev->bootloader = bootloader;
62f25bae MG	368	dev->opened_at = time(NULL);
9db2e455 MG	369
	370	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	371	if (!cb_data) {
	372	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	373	free(dev);
211fd7e5	374	libusb_close(devh);
018f85fa MG	375	#ifdef NEED_LIBUSB_EXIT
	376	hmcfgusb_exit();
	377	#endif
9db2e455 MG	378	return NULL;
	379	}
	380
	381	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	382
813afd12	383	cb_data->dev = dev;
9db2e455 MG	384	cb_data->cb = cb;
	385	cb_data->data = data;
	386
bafd75c9	387	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data, ASYNC_SIZE);
b5e57d26	388
9db2e455 MG	389	if (!dev->transfer) {
9db2e455 MG	390	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	391	free(dev);
4cadd56d MG	392	free(cb_data);
211fd7e5	393	libusb_close(devh);
018f85fa MG	394	#ifdef NEED_LIBUSB_EXIT
	395	hmcfgusb_exit();
	396	#endif
9db2e455 MG	397	return NULL;
	398	}
	399
	400	usb_pfd = libusb_get_pollfds(NULL);
	401	if (!usb_pfd) {
	402	fprintf(stderr, "Can't get FDset from libusb!\n");
018f85fa MG	403	libusb_cancel_transfer(dev->transfer);
018f85fa MG	404	libusb_handle_events(NULL);
9db2e455	405	free(dev);
4cadd56d	406	free(cb_data);
211fd7e5	407	libusb_close(devh);
018f85fa MG	408	#ifdef NEED_LIBUSB_EXIT
	409	hmcfgusb_exit();
	410	#endif
9db2e455 MG	411	return NULL;
	412	}
	413
	414	dev->n_usb_pfd = 0;
	415	for(i = 0; usb_pfd[i]; i++)
	416	dev->n_usb_pfd++;
	417
	418	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	419	if (!dev->pfd) {
	420	perror("Can't allocate memory for poll-fds");
018f85fa MG	421	libusb_cancel_transfer(dev->transfer);
018f85fa MG	422	libusb_handle_events(NULL);
4cadd56d MG	423	free(dev);
4cadd56d MG	424	free(cb_data);
211fd7e5	425	libusb_close(devh);
018f85fa MG	426	#ifdef NEED_LIBUSB_EXIT
	427	hmcfgusb_exit();
	428	#endif
9db2e455 MG	429	return NULL;
	430	}
	431
	432	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	433
	434	for (i = 0; i < dev->n_usb_pfd; i++) {
	435	dev->pfd[i].fd = usb_pfd[i]->fd;
	436	dev->pfd[i].events = usb_pfd[i]->events;
	437	dev->pfd[i].revents = 0;
	438	}
	439
	440	free(usb_pfd);
	441
	442	dev->n_pfd = dev->n_usb_pfd;
	443
f16395da MG	444	quit = 0;
f16395da MG	445
9db2e455 MG	446	return dev;
	447	}
	448
	449	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	450	{
	451	dev->n_pfd++;
	452	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	453	if (!dev->pfd) {
	454	perror("Can't realloc poll-fds");
	455	return 0;
	456	}
	457
	458	dev->pfd[dev->n_pfd-1].fd = fd;
	459	dev->pfd[dev->n_pfd-1].events = events;
	460	dev->pfd[dev->n_pfd-1].revents = 0;
	461
	462	return 1;
	463	}
	464
	465	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	466	{
	467	struct timeval tv;
	468	int usb_event = 0;
1e79d00a	469	int timed_out = 0;
9db2e455 MG	470	int i;
	471	int n;
	472	int fd_n;
	473	int err;
	474
	475	errno = 0;
	476
	477	memset(&tv, 0, sizeof(tv));
	478	err = libusb_get_next_timeout(NULL, &tv);
	479	if (err < 0) {
	480	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	481	errno = EIO;
	482	return -1;
	483	} else if (err == 0) {
	484	/* No pending timeout or a sane platform */
9db2e455 MG	485	} else {
	486	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	487	usb_event = 1;
3b35a8c1 MG	488	} else if ((tv.tv_sec * 1000) < timeout) {
3b35a8c1 MG	489	timeout = tv.tv_sec * 1000;
9db2e455 MG	490	}
	491	}
	492
	493	if (!usb_event) {
	494	for (i = 0; i < dev->n_pfd; i++) {
	495	dev->pfd[i].revents = 0;
	496	}
	497
3b35a8c1	498	n = poll(dev->pfd, dev->n_pfd, timeout);
9db2e455 MG	499	if (n < 0) {
9db2e455 MG	500	perror("poll");
816f5cd2	501	errno = 0;
9db2e455 MG	502	return -1;
	503	} else if (n == 0) {
	504	usb_event = 1;
1e79d00a	505	timed_out = 1;
9db2e455 MG	506	} else {
	507	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	508	if (dev->pfd[fd_n].revents) {
	509	if (fd_n < dev->n_usb_pfd) {
	510	usb_event = 1;
	511	break;
	512	} else {
816f5cd2	513	errno = 0;
9db2e455 MG	514	return dev->pfd[fd_n].fd;
	515	}
	516	}
	517	}
	518	}
	519	}
	520
	521	if (usb_event) {
	522	memset(&tv, 0, sizeof(tv));
	523	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	524	if (err < 0) {
27bb301b	525	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	526	errno = EIO;
	527	return -1;
	528	}
	529	}
	530
816f5cd2 MG	531	errno = 0;
	532	if (quit) {
	533	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	534	errno = quit;
816f5cd2	535	}
9db2e455	536
1e79d00a MG	537	if (timed_out)
	538	errno = ETIMEDOUT;
	539
9db2e455 MG	540	return -1;
9db2e455 MG	541	}
813afd12	542
62f25bae MG	543	void hmcfgusb_enter_bootloader(struct hmcfgusb_dev *dev)
	544	{
	545	uint8_t out[ASYNC_SIZE];
	546
	547	if (dev->bootloader) {
	548	fprintf(stderr, "request for bootloader mode, but device already in bootloader!\n");
	549	return;
	550	}
	551
	552	memset(out, 0, sizeof(out));
	553	out[0] = 'B';
	554	hmcfgusb_send(dev, out, sizeof(out), 1);
	555
	556	return;
	557	}
	558
0ddb3740 MG	559	void hmcfgusb_leave_bootloader(struct hmcfgusb_dev *dev)
	560	{
	561	uint8_t out[ASYNC_SIZE];
	562
	563	if (!dev->bootloader) {
	564	fprintf(stderr, "request for leaving bootloader mode, but device already in normal mode!\n");
	565	return;
	566	}
	567
	568	memset(out, 0, sizeof(out));
	569	out[0] = 'K';
	570	hmcfgusb_send(dev, out, sizeof(out), 1);
	571
	572	return;
	573	}
	574
813afd12 MG	575	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	576	{
	577	int err;
	578
	579	if (dev->transfer) {
	580	libusb_cancel_transfer(dev->transfer);
018f85fa	581	libusb_handle_events(NULL);
813afd12 MG	582	}
	583
	584	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	585	if ((err != 0)) {
	586	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	587	}
	588
	589	libusb_close(dev->usb_devh);
018f85fa MG	590	#ifdef NEED_LIBUSB_EXIT
	591	hmcfgusb_exit();
	592	#endif
e0a7146e	593	free(dev->pfd);
813afd12	594	free(dev);
018f85fa	595	}
813afd12	596
018f85fa MG	597	void hmcfgusb_exit(void)
	598	{
	599	if (libusb_initialized) {
	600	libusb_exit(NULL);
	601	libusb_initialized = 0;
	602	}
813afd12	603	}
e75295bb MG	604
	605	void hmcfgusb_set_debug(int d)
	606	{
	607	debug = d;
	608	}