[hmcfgusb] / hmcfgusb.c

/* HM-CFG-USB libusb-driver
 *
 * Copyright (c) 2013 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>

#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;

/* 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() {
	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 == ID_VENDOR) &&
		    ((desc.idProduct == ID_PRODUCT) || (desc.idProduct == ID_PRODUCT_BL))) {
			libusb_device *dev = list[i];

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

			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));
				return NULL;
			}

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

			return devh;
		}

	}

	return NULL;
}

int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
{
	int err;
	int cnt;

	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, NULL, 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)
{
	unsigned char *data_buf;
	struct libusb_transfer *transfer;
	int err;

	data_buf = malloc(ASYNC_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, ASYNC_SIZE, cb, data, USB_TIMEOUT);

	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK | 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) {
			fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
			quit = EIO;

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

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

				return;
			}
		} 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));
		libusb_free_transfer(transfer);
		cb_data->dev->transfer = NULL;
		free(cb_data);
	}
}

struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
{
	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 err;
	int i;

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

	devh = hmcfgusb_find();
	if (!devh) {
		fprintf(stderr, "Can't find/open hmcfgusb!\n");
		return NULL;
	}

	dev = malloc(sizeof(struct hmcfgusb_dev));
	if (!dev) {
		perror("Can't allocate memory for hmcfgusb_dev");
		return NULL;
	}

	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	dev->usb_devh = devh;

	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	if (!cb_data) {
		perror("Can't allocate memory for hmcfgusb_cb_data");
		free(dev);
		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);
	if (!dev->transfer) {
		fprintf(stderr, "Can't prepare async device io!\n");
		free(dev);
		free(cb_data);
		return NULL;
	}

	usb_pfd = libusb_get_pollfds(NULL);
	if (!usb_pfd) {
		fprintf(stderr, "Can't get FDset from libusb!\n");
		free(dev);
		free(cb_data);
		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");
		free(dev);
		free(cb_data);
		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 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 */
		tv.tv_sec = timeout;
	} else {
		if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
			usb_event = 1;
		} else if (tv.tv_sec > timeout) {
			tv.tv_sec = timeout;
			tv.tv_usec = 0;
		}
	}

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

		n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
		if (n < 0) {
			perror("poll");
			errno = 0;
			return -1;
		} else if (n == 0) {
			usb_event = 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;
	}

	return -1;
}

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

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

	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);
	free(dev->pfd);
	free(dev);

	libusb_exit(NULL);
}

void hmcfgusb_set_debug(int d)
{
	debug = d;
}
Commit	Line	Data
9db2e455 MG	1	/* HM-CFG-USB libusb-driver
	2	*
	3	* Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
	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>
	34
	35	#include "hexdump.h"
	36	#include "hmcfgusb.h"
	37
813afd12	38	#define USB_TIMEOUT 10000
9db2e455 MG	39
	40	#define ID_VENDOR 0x1b1f
	41	#define ID_PRODUCT 0xc00f
4d0be794	42	#define ID_PRODUCT_BL 0xc010
9db2e455 MG	43
	44	/* TODO: dynamic */
	45	#define ASYNC_SIZE 0x0040
	46	#define ASYNC_INTERVAL 32
	47
	48	#define EP_OUT 0x02
	49	#define EP_IN 0x83
	50
813afd12 MG	51	#define INTERFACE 0
813afd12 MG	52
9db2e455	53	static int quit = 0;
e75295bb	54	static int debug = 0;
9db2e455 MG	55
	56	/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
	57	static char * usb_strerror(int e)
	58	{
	59	static char unknerr[256];
	60
	61	switch (e) {
	62	case LIBUSB_SUCCESS:
	63	return "Success";
	64	case LIBUSB_ERROR_IO:
	65	return "Input/output error";
	66	case LIBUSB_ERROR_INVALID_PARAM:
	67	return "Invalid parameter";
	68	case LIBUSB_ERROR_ACCESS:
	69	return "Access denied (insufficient permissions)";
	70	case LIBUSB_ERROR_NO_DEVICE:
	71	return "No such device (it may have been disconnected)";
	72	case LIBUSB_ERROR_NOT_FOUND:
	73	return "Entity not found";
	74	case LIBUSB_ERROR_BUSY:
	75	return "Resource busy";
	76	case LIBUSB_ERROR_TIMEOUT:
	77	return "Operation timed out";
	78	case LIBUSB_ERROR_OVERFLOW:
	79	return "Overflow";
	80	case LIBUSB_ERROR_PIPE:
	81	return "Pipe error";
	82	case LIBUSB_ERROR_INTERRUPTED:
	83	return "System call interrupted (perhaps due to signal)";
	84	case LIBUSB_ERROR_NO_MEM:
	85	return "Insufficient memory";
	86	case LIBUSB_ERROR_NOT_SUPPORTED:
	87	return "Operation not supported or unimplemented on this platform";
	88	case LIBUSB_ERROR_OTHER:
	89	return "Other error";
	90	};
	91	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	92	return unknerr;
	93	}
	94
	95	static libusb_device_handle *hmcfgusb_find() {
	96	libusb_device_handle *devh = NULL;
	97	libusb_device **list;
	98	ssize_t cnt;
	99	ssize_t i;
	100	int err;
	101
	102	cnt = libusb_get_device_list(NULL, &list);
	103	if (cnt < 0) {
	104	fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
	105	return NULL;
	106	}
	107
	108	for (i = 0; i < cnt; i++){
	109	struct libusb_device_descriptor desc;
	110
	111	err = libusb_get_device_descriptor(list[i], &desc);
	112	if (err)
	113	continue;
	114
4d0be794 MG	115	if ((desc.idVendor == ID_VENDOR) &&
4d0be794 MG	116	((desc.idProduct == ID_PRODUCT) \|\| (desc.idProduct == ID_PRODUCT_BL))) {
9db2e455 MG	117	libusb_device *dev = list[i];
	118
	119	err = libusb_open(dev, &devh);
	120	if (err) {
	121	fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
	122	return NULL;
	123	}
	124
813afd12	125	err = libusb_detach_kernel_driver(devh, INTERFACE);
9db2e455 MG	126	if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
	127	fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
	128	return NULL;
	129	}
	130
813afd12	131	err = libusb_claim_interface(devh, INTERFACE);
9db2e455 MG	132	if ((err != 0)) {
	133	fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
	134	return NULL;
	135	}
	136
	137	return devh;
	138	}
	139
	140	}
	141
	142	return NULL;
	143	}
	144
6262005e	145	int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
2a6eaefc MG	146	{
	147	int err;
	148	int cnt;
	149
	150	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, NULL, 0, &cnt, USB_TIMEOUT);
6262005e MG	151	if (err && (!silent)) {
6262005e MG	152	fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
2a6eaefc MG	153	return 0;
	154	}
	155
	156	return 1;
	157	}
	158
9db2e455 MG	159	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	160	{
	161	int err;
	162	int cnt;
f8718b41 MG	163	struct timeval tv_start, tv_end;
f8718b41 MG	164	int msec;
9db2e455	165
f8718b41	166	if (debug) {
627e3f33	167	hexdump(send_data, len, "USB < ");
f8718b41 MG	168	}
f8718b41 MG	169
d200d8ca MG	170	gettimeofday(&tv_start, NULL);
d200d8ca MG	171
9db2e455 MG	172	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	173	if (err) {
	174	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	175	return 0;
	176	}
	177
	178	if (done) {
6262005e	179	if (!hmcfgusb_send_null_frame(usbdev, 0)) {
9db2e455 MG	180	return 0;
	181	}
	182	}
	183
d200d8ca MG	184	gettimeofday(&tv_end, NULL);
	185	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
	186
	187	if (msec > 100) {
6df7655e	188	fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
d200d8ca MG	189	} else if (debug) {
d200d8ca MG	190	fprintf(stderr, "usb-transfer took %dms!\n", msec);
f8718b41 MG	191	}
f8718b41 MG	192
e0a7146e	193	return 1;
9db2e455 MG	194	}
	195
	196	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data)
	197	{
	198	unsigned char *data_buf;
	199	struct libusb_transfer *transfer;
	200	int err;
	201
	202	data_buf = malloc(ASYNC_SIZE);
	203	if (!data_buf) {
	204	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	205	return NULL;
	206	}
	207
	208	transfer = libusb_alloc_transfer(0);
	209	if (!transfer) {
	210	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	211	free(data_buf);
	212	return NULL;
	213	}
	214
	215	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
	216	data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
	217
813afd12	218	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK \| LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	219
	220	err = libusb_submit_transfer(transfer);
	221	if (err != 0) {
	222	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	223	libusb_free_transfer(transfer);
9db2e455 MG	224	return NULL;
	225	}
	226
	227	return transfer;
	228	}
	229
	230	struct hmcfgusb_cb_data {
813afd12	231	struct hmcfgusb_dev *dev;
9db2e455 MG	232	hmcfgusb_cb_fn cb;
	233	void *data;
	234	};
	235
	236	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	237	{
	238	int err;
	239	struct hmcfgusb_cb_data *cb_data;
	240
813afd12 MG	241	cb_data = transfer->user_data;
813afd12 MG	242
9db2e455 MG	243	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
9db2e455 MG	244	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
032d6050	245	fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
9db2e455	246	quit = EIO;
813afd12 MG	247
	248	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	249	libusb_free_transfer(cb_data->dev->transfer);
	250	cb_data->dev->transfer = NULL;
4cadd56d	251	free(cb_data);
813afd12	252	}
9db2e455 MG	253	return;
9db2e455 MG	254	}
9db2e455	255	} else {
27bb301b	256	if (cb_data && cb_data->cb) {
e0a7146e	257	if (debug)
627e3f33	258	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	259
	260	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	261	quit = EIO;
	262
	263	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	264	libusb_free_transfer(cb_data->dev->transfer);
	265	cb_data->dev->transfer = NULL;
4cadd56d	266	free(cb_data);
4371275b MG	267	}
	268
	269	return;
	270	}
27bb301b	271	} else {
e0a7146e	272	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	273	}
9db2e455 MG	274	}
	275
	276	err = libusb_submit_transfer(transfer);
	277	if (err != 0) {
	278	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
9db2e455	279	libusb_free_transfer(transfer);
4cadd56d MG	280	cb_data->dev->transfer = NULL;
4cadd56d MG	281	free(cb_data);
9db2e455 MG	282	}
	283	}
	284
	285	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data)
	286	{
	287	libusb_device_handle *devh = NULL;
	288	const struct libusb_pollfd **usb_pfd = NULL;
	289	struct hmcfgusb_dev *dev = NULL;
	290	struct hmcfgusb_cb_data *cb_data = NULL;
	291	int err;
	292	int i;
	293
	294	err = libusb_init(NULL);
	295	if (err != 0) {
	296	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	297	return NULL;
	298	}
	299
	300	devh = hmcfgusb_find();
	301	if (!devh) {
	302	fprintf(stderr, "Can't find/open hmcfgusb!\n");
	303	return NULL;
	304	}
	305
	306	dev = malloc(sizeof(struct hmcfgusb_dev));
	307	if (!dev) {
	308	perror("Can't allocate memory for hmcfgusb_dev");
	309	return NULL;
	310	}
	311
	312	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	313	dev->usb_devh = devh;
	314
	315	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	316	if (!cb_data) {
	317	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	318	free(dev);
9db2e455 MG	319	return NULL;
	320	}
	321
	322	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	323
813afd12	324	cb_data->dev = dev;
9db2e455 MG	325	cb_data->cb = cb;
	326	cb_data->data = data;
	327
	328	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
	329	if (!dev->transfer) {
	330	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	331	free(dev);
4cadd56d MG	332	free(cb_data);
9db2e455 MG	333	return NULL;
	334	}
	335
	336	usb_pfd = libusb_get_pollfds(NULL);
	337	if (!usb_pfd) {
	338	fprintf(stderr, "Can't get FDset from libusb!\n");
	339	free(dev);
4cadd56d	340	free(cb_data);
9db2e455 MG	341	return NULL;
	342	}
	343
	344	dev->n_usb_pfd = 0;
	345	for(i = 0; usb_pfd[i]; i++)
	346	dev->n_usb_pfd++;
	347
	348	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	349	if (!dev->pfd) {
	350	perror("Can't allocate memory for poll-fds");
4cadd56d MG	351	free(dev);
4cadd56d MG	352	free(cb_data);
9db2e455 MG	353	return NULL;
	354	}
	355
	356	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	357
	358	for (i = 0; i < dev->n_usb_pfd; i++) {
	359	dev->pfd[i].fd = usb_pfd[i]->fd;
	360	dev->pfd[i].events = usb_pfd[i]->events;
	361	dev->pfd[i].revents = 0;
	362	}
	363
	364	free(usb_pfd);
	365
	366	dev->n_pfd = dev->n_usb_pfd;
	367
f16395da MG	368	quit = 0;
f16395da MG	369
9db2e455 MG	370	return dev;
	371	}
	372
	373	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	374	{
	375	dev->n_pfd++;
	376	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	377	if (!dev->pfd) {
	378	perror("Can't realloc poll-fds");
	379	return 0;
	380	}
	381
	382	dev->pfd[dev->n_pfd-1].fd = fd;
	383	dev->pfd[dev->n_pfd-1].events = events;
	384	dev->pfd[dev->n_pfd-1].revents = 0;
	385
	386	return 1;
	387	}
	388
	389	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	390	{
	391	struct timeval tv;
	392	int usb_event = 0;
	393	int i;
	394	int n;
	395	int fd_n;
	396	int err;
	397
	398	errno = 0;
	399
	400	memset(&tv, 0, sizeof(tv));
	401	err = libusb_get_next_timeout(NULL, &tv);
	402	if (err < 0) {
	403	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	404	errno = EIO;
	405	return -1;
	406	} else if (err == 0) {
	407	/* No pending timeout or a sane platform */
	408	tv.tv_sec = timeout;
	409	} else {
	410	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	411	usb_event = 1;
ec30827c MG	412	} else if (tv.tv_sec > timeout) {
	413	tv.tv_sec = timeout;
	414	tv.tv_usec = 0;
9db2e455 MG	415	}
	416	}
	417
	418	if (!usb_event) {
	419	for (i = 0; i < dev->n_pfd; i++) {
	420	dev->pfd[i].revents = 0;
	421	}
	422
	423	n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
	424	if (n < 0) {
	425	perror("poll");
816f5cd2	426	errno = 0;
9db2e455 MG	427	return -1;
	428	} else if (n == 0) {
	429	usb_event = 1;
	430	} else {
	431	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	432	if (dev->pfd[fd_n].revents) {
	433	if (fd_n < dev->n_usb_pfd) {
	434	usb_event = 1;
	435	break;
	436	} else {
816f5cd2	437	errno = 0;
9db2e455 MG	438	return dev->pfd[fd_n].fd;
	439	}
	440	}
	441	}
	442	}
	443	}
	444
	445	if (usb_event) {
	446	memset(&tv, 0, sizeof(tv));
	447	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	448	if (err < 0) {
27bb301b	449	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	450	errno = EIO;
	451	return -1;
	452	}
	453	}
	454
816f5cd2 MG	455	errno = 0;
	456	if (quit) {
	457	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	458	errno = quit;
816f5cd2	459	}
9db2e455 MG	460
	461	return -1;
	462	}
813afd12 MG	463
	464	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	465	{
	466	int err;
	467
	468	if (dev->transfer) {
	469	libusb_cancel_transfer(dev->transfer);
	470	}
	471
	472	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	473	if ((err != 0)) {
	474	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	475	}
	476
	477	libusb_close(dev->usb_devh);
e0a7146e	478	free(dev->pfd);
813afd12 MG	479	free(dev);
	480
	481	libusb_exit(NULL);
	482	}
e75295bb MG	483
	484	void hmcfgusb_set_debug(int d)
	485	{
	486	debug = d;
	487	}