[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

/* 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)) {
			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 err;
	int cnt;

	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, NULL, 0, &cnt, USB_TIMEOUT);
	if (err) {
		fprintf(stderr, "Can't send data: %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)) {
			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) {
		if (debug)
			fprintf(stderr, "usb-transfer took more than 100ms (%dms), this can 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: %d!\n", 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;
		}
	}

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