[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;
	unsigned char out[0x40];

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

	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, sizeof(out), &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 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 */
		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;
			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_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;
3435bdb6	149	unsigned char out[0x40];
2a6eaefc	150
3435bdb6 MG	151	memset(out, 0, sizeof(out));
	152
	153	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, sizeof(out), &cnt, USB_TIMEOUT);
6262005e MG	154	if (err && (!silent)) {
6262005e MG	155	fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
2a6eaefc MG	156	return 0;
	157	}
	158
	159	return 1;
	160	}
	161
9db2e455 MG	162	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	163	{
	164	int err;
	165	int cnt;
f8718b41 MG	166	struct timeval tv_start, tv_end;
f8718b41 MG	167	int msec;
9db2e455	168
f8718b41	169	if (debug) {
627e3f33	170	hexdump(send_data, len, "USB < ");
f8718b41 MG	171	}
f8718b41 MG	172
d200d8ca MG	173	gettimeofday(&tv_start, NULL);
d200d8ca MG	174
9db2e455 MG	175	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	176	if (err) {
	177	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	178	return 0;
	179	}
	180
	181	if (done) {
6262005e	182	if (!hmcfgusb_send_null_frame(usbdev, 0)) {
9db2e455 MG	183	return 0;
	184	}
	185	}
	186
d200d8ca MG	187	gettimeofday(&tv_end, NULL);
	188	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
	189
	190	if (msec > 100) {
6df7655e	191	fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
d200d8ca MG	192	} else if (debug) {
d200d8ca MG	193	fprintf(stderr, "usb-transfer took %dms!\n", msec);
f8718b41 MG	194	}
f8718b41 MG	195
e0a7146e	196	return 1;
9db2e455 MG	197	}
	198
	199	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data)
	200	{
	201	unsigned char *data_buf;
	202	struct libusb_transfer *transfer;
	203	int err;
	204
	205	data_buf = malloc(ASYNC_SIZE);
	206	if (!data_buf) {
	207	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	208	return NULL;
	209	}
	210
	211	transfer = libusb_alloc_transfer(0);
	212	if (!transfer) {
	213	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	214	free(data_buf);
	215	return NULL;
	216	}
	217
	218	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
	219	data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
	220
813afd12	221	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK \| LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	222
	223	err = libusb_submit_transfer(transfer);
	224	if (err != 0) {
	225	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	226	libusb_free_transfer(transfer);
9db2e455 MG	227	return NULL;
	228	}
	229
	230	return transfer;
	231	}
	232
	233	struct hmcfgusb_cb_data {
813afd12	234	struct hmcfgusb_dev *dev;
9db2e455 MG	235	hmcfgusb_cb_fn cb;
	236	void *data;
	237	};
	238
	239	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	240	{
	241	int err;
	242	struct hmcfgusb_cb_data *cb_data;
	243
813afd12 MG	244	cb_data = transfer->user_data;
813afd12 MG	245
9db2e455 MG	246	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
9db2e455 MG	247	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
032d6050	248	fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
9db2e455	249	quit = EIO;
813afd12 MG	250
	251	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	252	libusb_free_transfer(cb_data->dev->transfer);
	253	cb_data->dev->transfer = NULL;
4cadd56d	254	free(cb_data);
813afd12	255	}
9db2e455 MG	256	return;
9db2e455 MG	257	}
9db2e455	258	} else {
27bb301b	259	if (cb_data && cb_data->cb) {
e0a7146e	260	if (debug)
627e3f33	261	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	262
	263	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	264	quit = EIO;
	265
	266	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	267	libusb_free_transfer(cb_data->dev->transfer);
	268	cb_data->dev->transfer = NULL;
4cadd56d	269	free(cb_data);
4371275b MG	270	}
	271
	272	return;
	273	}
27bb301b	274	} else {
e0a7146e	275	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	276	}
9db2e455 MG	277	}
	278
	279	err = libusb_submit_transfer(transfer);
	280	if (err != 0) {
	281	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
9db2e455	282	libusb_free_transfer(transfer);
4cadd56d MG	283	cb_data->dev->transfer = NULL;
4cadd56d MG	284	free(cb_data);
9db2e455 MG	285	}
	286	}
	287
	288	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data)
	289	{
	290	libusb_device_handle *devh = NULL;
	291	const struct libusb_pollfd **usb_pfd = NULL;
	292	struct hmcfgusb_dev *dev = NULL;
	293	struct hmcfgusb_cb_data *cb_data = NULL;
	294	int err;
	295	int i;
	296
	297	err = libusb_init(NULL);
	298	if (err != 0) {
	299	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	300	return NULL;
	301	}
	302
	303	devh = hmcfgusb_find();
	304	if (!devh) {
	305	fprintf(stderr, "Can't find/open hmcfgusb!\n");
	306	return NULL;
	307	}
	308
	309	dev = malloc(sizeof(struct hmcfgusb_dev));
	310	if (!dev) {
	311	perror("Can't allocate memory for hmcfgusb_dev");
	312	return NULL;
	313	}
	314
	315	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	316	dev->usb_devh = devh;
	317
	318	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	319	if (!cb_data) {
	320	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	321	free(dev);
9db2e455 MG	322	return NULL;
	323	}
	324
	325	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	326
813afd12	327	cb_data->dev = dev;
9db2e455 MG	328	cb_data->cb = cb;
	329	cb_data->data = data;
	330
	331	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
	332	if (!dev->transfer) {
	333	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	334	free(dev);
4cadd56d MG	335	free(cb_data);
9db2e455 MG	336	return NULL;
	337	}
	338
	339	usb_pfd = libusb_get_pollfds(NULL);
	340	if (!usb_pfd) {
	341	fprintf(stderr, "Can't get FDset from libusb!\n");
	342	free(dev);
4cadd56d	343	free(cb_data);
9db2e455 MG	344	return NULL;
	345	}
	346
	347	dev->n_usb_pfd = 0;
	348	for(i = 0; usb_pfd[i]; i++)
	349	dev->n_usb_pfd++;
	350
	351	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	352	if (!dev->pfd) {
	353	perror("Can't allocate memory for poll-fds");
4cadd56d MG	354	free(dev);
4cadd56d MG	355	free(cb_data);
9db2e455 MG	356	return NULL;
	357	}
	358
	359	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	360
	361	for (i = 0; i < dev->n_usb_pfd; i++) {
	362	dev->pfd[i].fd = usb_pfd[i]->fd;
	363	dev->pfd[i].events = usb_pfd[i]->events;
	364	dev->pfd[i].revents = 0;
	365	}
	366
	367	free(usb_pfd);
	368
	369	dev->n_pfd = dev->n_usb_pfd;
	370
f16395da MG	371	quit = 0;
f16395da MG	372
9db2e455 MG	373	return dev;
	374	}
	375
	376	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	377	{
	378	dev->n_pfd++;
	379	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	380	if (!dev->pfd) {
	381	perror("Can't realloc poll-fds");
	382	return 0;
	383	}
	384
	385	dev->pfd[dev->n_pfd-1].fd = fd;
	386	dev->pfd[dev->n_pfd-1].events = events;
	387	dev->pfd[dev->n_pfd-1].revents = 0;
	388
	389	return 1;
	390	}
	391
	392	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	393	{
	394	struct timeval tv;
	395	int usb_event = 0;
1e79d00a	396	int timed_out = 0;
9db2e455 MG	397	int i;
	398	int n;
	399	int fd_n;
	400	int err;
	401
	402	errno = 0;
	403
	404	memset(&tv, 0, sizeof(tv));
	405	err = libusb_get_next_timeout(NULL, &tv);
	406	if (err < 0) {
	407	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	408	errno = EIO;
	409	return -1;
	410	} else if (err == 0) {
	411	/* No pending timeout or a sane platform */
	412	tv.tv_sec = timeout;
	413	} else {
	414	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	415	usb_event = 1;
ec30827c MG	416	} else if (tv.tv_sec > timeout) {
	417	tv.tv_sec = timeout;
	418	tv.tv_usec = 0;
9db2e455 MG	419	}
	420	}
	421
	422	if (!usb_event) {
	423	for (i = 0; i < dev->n_pfd; i++) {
	424	dev->pfd[i].revents = 0;
	425	}
	426
	427	n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
	428	if (n < 0) {
	429	perror("poll");
816f5cd2	430	errno = 0;
9db2e455 MG	431	return -1;
	432	} else if (n == 0) {
	433	usb_event = 1;
1e79d00a	434	timed_out = 1;
9db2e455 MG	435	} else {
	436	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	437	if (dev->pfd[fd_n].revents) {
	438	if (fd_n < dev->n_usb_pfd) {
	439	usb_event = 1;
	440	break;
	441	} else {
816f5cd2	442	errno = 0;
9db2e455 MG	443	return dev->pfd[fd_n].fd;
	444	}
	445	}
	446	}
	447	}
	448	}
	449
	450	if (usb_event) {
	451	memset(&tv, 0, sizeof(tv));
	452	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	453	if (err < 0) {
27bb301b	454	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	455	errno = EIO;
	456	return -1;
	457	}
	458	}
	459
816f5cd2 MG	460	errno = 0;
	461	if (quit) {
	462	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	463	errno = quit;
816f5cd2	464	}
9db2e455	465
1e79d00a MG	466	if (timed_out)
	467	errno = ETIMEDOUT;
	468
9db2e455 MG	469	return -1;
9db2e455 MG	470	}
813afd12 MG	471
	472	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	473	{
	474	int err;
	475
	476	if (dev->transfer) {
	477	libusb_cancel_transfer(dev->transfer);
	478	}
	479
	480	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	481	if ((err != 0)) {
	482	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	483	}
	484
	485	libusb_close(dev->usb_devh);
e0a7146e	486	free(dev->pfd);
813afd12 MG	487	free(dev);
	488
	489	libusb_exit(NULL);
	490	}
e75295bb MG	491
	492	void hmcfgusb_set_debug(int d)
	493	{
	494	debug = d;
	495	}