[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>

/* 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;

/* 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, 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 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>
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;
9db2e455 MG	61
	62	/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
	63	static char * usb_strerror(int e)
	64	{
	65	static char unknerr[256];
	66
	67	switch (e) {
	68	case LIBUSB_SUCCESS:
	69	return "Success";
	70	case LIBUSB_ERROR_IO:
	71	return "Input/output error";
	72	case LIBUSB_ERROR_INVALID_PARAM:
	73	return "Invalid parameter";
	74	case LIBUSB_ERROR_ACCESS:
	75	return "Access denied (insufficient permissions)";
	76	case LIBUSB_ERROR_NO_DEVICE:
	77	return "No such device (it may have been disconnected)";
	78	case LIBUSB_ERROR_NOT_FOUND:
	79	return "Entity not found";
	80	case LIBUSB_ERROR_BUSY:
	81	return "Resource busy";
	82	case LIBUSB_ERROR_TIMEOUT:
	83	return "Operation timed out";
	84	case LIBUSB_ERROR_OVERFLOW:
	85	return "Overflow";
	86	case LIBUSB_ERROR_PIPE:
	87	return "Pipe error";
	88	case LIBUSB_ERROR_INTERRUPTED:
	89	return "System call interrupted (perhaps due to signal)";
	90	case LIBUSB_ERROR_NO_MEM:
	91	return "Insufficient memory";
	92	case LIBUSB_ERROR_NOT_SUPPORTED:
	93	return "Operation not supported or unimplemented on this platform";
	94	case LIBUSB_ERROR_OTHER:
	95	return "Other error";
	96	};
	97	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	98	return unknerr;
	99	}
	100
	101	static libusb_device_handle *hmcfgusb_find() {
	102	libusb_device_handle *devh = NULL;
	103	libusb_device **list;
	104	ssize_t cnt;
	105	ssize_t i;
	106	int err;
	107
	108	cnt = libusb_get_device_list(NULL, &list);
	109	if (cnt < 0) {
	110	fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
	111	return NULL;
	112	}
	113
	114	for (i = 0; i < cnt; i++){
	115	struct libusb_device_descriptor desc;
	116
	117	err = libusb_get_device_descriptor(list[i], &desc);
	118	if (err)
	119	continue;
	120
4d0be794 MG	121	if ((desc.idVendor == ID_VENDOR) &&
4d0be794 MG	122	((desc.idProduct == ID_PRODUCT) \|\| (desc.idProduct == ID_PRODUCT_BL))) {
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));
	128	return NULL;
	129	}
	130
813afd12	131	err = libusb_detach_kernel_driver(devh, INTERFACE);
9db2e455 MG	132	if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
	133	fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
	134	return NULL;
	135	}
	136
813afd12	137	err = libusb_claim_interface(devh, INTERFACE);
9db2e455 MG	138	if ((err != 0)) {
	139	fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
	140	return NULL;
	141	}
	142
	143	return devh;
	144	}
	145
	146	}
	147
	148	return NULL;
	149	}
	150
6262005e	151	int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
2a6eaefc MG	152	{
	153	int err;
	154	int cnt;
3435bdb6	155	unsigned char out[0x40];
2a6eaefc	156
3435bdb6 MG	157	memset(out, 0, sizeof(out));
3435bdb6 MG	158
3d5b8e70	159	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
6262005e MG	160	if (err && (!silent)) {
6262005e MG	161	fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
2a6eaefc MG	162	return 0;
	163	}
	164
	165	return 1;
	166	}
	167
9db2e455 MG	168	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	169	{
	170	int err;
	171	int cnt;
f8718b41 MG	172	struct timeval tv_start, tv_end;
f8718b41 MG	173	int msec;
9db2e455	174
f8718b41	175	if (debug) {
627e3f33	176	hexdump(send_data, len, "USB < ");
f8718b41 MG	177	}
f8718b41 MG	178
d200d8ca MG	179	gettimeofday(&tv_start, NULL);
d200d8ca MG	180
9db2e455 MG	181	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	182	if (err) {
	183	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	184	return 0;
	185	}
	186
	187	if (done) {
6262005e	188	if (!hmcfgusb_send_null_frame(usbdev, 0)) {
9db2e455 MG	189	return 0;
	190	}
	191	}
	192
d200d8ca MG	193	gettimeofday(&tv_end, NULL);
	194	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
	195
	196	if (msec > 100) {
6df7655e	197	fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
d200d8ca MG	198	} else if (debug) {
d200d8ca MG	199	fprintf(stderr, "usb-transfer took %dms!\n", msec);
f8718b41 MG	200	}
f8718b41 MG	201
e0a7146e	202	return 1;
9db2e455 MG	203	}
	204
	205	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data)
	206	{
	207	unsigned char *data_buf;
	208	struct libusb_transfer *transfer;
	209	int err;
	210
	211	data_buf = malloc(ASYNC_SIZE);
	212	if (!data_buf) {
	213	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	214	return NULL;
	215	}
	216
	217	transfer = libusb_alloc_transfer(0);
	218	if (!transfer) {
	219	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	220	free(data_buf);
	221	return NULL;
	222	}
	223
	224	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
	225	data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
	226
813afd12	227	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK \| LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	228
	229	err = libusb_submit_transfer(transfer);
	230	if (err != 0) {
	231	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	232	libusb_free_transfer(transfer);
9db2e455 MG	233	return NULL;
	234	}
	235
	236	return transfer;
	237	}
	238
	239	struct hmcfgusb_cb_data {
813afd12	240	struct hmcfgusb_dev *dev;
9db2e455 MG	241	hmcfgusb_cb_fn cb;
	242	void *data;
	243	};
	244
	245	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	246	{
	247	int err;
	248	struct hmcfgusb_cb_data *cb_data;
	249
813afd12 MG	250	cb_data = transfer->user_data;
813afd12 MG	251
9db2e455 MG	252	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
9db2e455 MG	253	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
032d6050	254	fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
9db2e455	255	quit = EIO;
813afd12 MG	256
	257	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	258	libusb_free_transfer(cb_data->dev->transfer);
	259	cb_data->dev->transfer = NULL;
4cadd56d	260	free(cb_data);
813afd12	261	}
9db2e455 MG	262	return;
9db2e455 MG	263	}
9db2e455	264	} else {
27bb301b	265	if (cb_data && cb_data->cb) {
e0a7146e	266	if (debug)
627e3f33	267	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	268
	269	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	270	quit = EIO;
	271
	272	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	273	libusb_free_transfer(cb_data->dev->transfer);
	274	cb_data->dev->transfer = NULL;
4cadd56d	275	free(cb_data);
4371275b MG	276	}
	277
	278	return;
	279	}
27bb301b	280	} else {
e0a7146e	281	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	282	}
9db2e455 MG	283	}
	284
	285	err = libusb_submit_transfer(transfer);
	286	if (err != 0) {
	287	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
9db2e455	288	libusb_free_transfer(transfer);
4cadd56d MG	289	cb_data->dev->transfer = NULL;
4cadd56d MG	290	free(cb_data);
9db2e455 MG	291	}
	292	}
	293
	294	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data)
	295	{
	296	libusb_device_handle *devh = NULL;
	297	const struct libusb_pollfd **usb_pfd = NULL;
	298	struct hmcfgusb_dev *dev = NULL;
	299	struct hmcfgusb_cb_data *cb_data = NULL;
	300	int err;
	301	int i;
	302
	303	err = libusb_init(NULL);
	304	if (err != 0) {
	305	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	306	return NULL;
	307	}
	308
	309	devh = hmcfgusb_find();
	310	if (!devh) {
	311	fprintf(stderr, "Can't find/open hmcfgusb!\n");
	312	return NULL;
	313	}
	314
	315	dev = malloc(sizeof(struct hmcfgusb_dev));
	316	if (!dev) {
	317	perror("Can't allocate memory for hmcfgusb_dev");
	318	return NULL;
	319	}
	320
	321	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	322	dev->usb_devh = devh;
	323
	324	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	325	if (!cb_data) {
	326	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	327	free(dev);
9db2e455 MG	328	return NULL;
	329	}
	330
	331	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	332
813afd12	333	cb_data->dev = dev;
9db2e455 MG	334	cb_data->cb = cb;
	335	cb_data->data = data;
	336
	337	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
	338	if (!dev->transfer) {
	339	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	340	free(dev);
4cadd56d MG	341	free(cb_data);
9db2e455 MG	342	return NULL;
	343	}
	344
	345	usb_pfd = libusb_get_pollfds(NULL);
	346	if (!usb_pfd) {
	347	fprintf(stderr, "Can't get FDset from libusb!\n");
	348	free(dev);
4cadd56d	349	free(cb_data);
9db2e455 MG	350	return NULL;
	351	}
	352
	353	dev->n_usb_pfd = 0;
	354	for(i = 0; usb_pfd[i]; i++)
	355	dev->n_usb_pfd++;
	356
	357	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	358	if (!dev->pfd) {
	359	perror("Can't allocate memory for poll-fds");
4cadd56d MG	360	free(dev);
4cadd56d MG	361	free(cb_data);
9db2e455 MG	362	return NULL;
	363	}
	364
	365	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	366
	367	for (i = 0; i < dev->n_usb_pfd; i++) {
	368	dev->pfd[i].fd = usb_pfd[i]->fd;
	369	dev->pfd[i].events = usb_pfd[i]->events;
	370	dev->pfd[i].revents = 0;
	371	}
	372
	373	free(usb_pfd);
	374
	375	dev->n_pfd = dev->n_usb_pfd;
	376
f16395da MG	377	quit = 0;
f16395da MG	378
9db2e455 MG	379	return dev;
	380	}
	381
	382	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	383	{
	384	dev->n_pfd++;
	385	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	386	if (!dev->pfd) {
	387	perror("Can't realloc poll-fds");
	388	return 0;
	389	}
	390
	391	dev->pfd[dev->n_pfd-1].fd = fd;
	392	dev->pfd[dev->n_pfd-1].events = events;
	393	dev->pfd[dev->n_pfd-1].revents = 0;
	394
	395	return 1;
	396	}
	397
	398	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	399	{
	400	struct timeval tv;
	401	int usb_event = 0;
1e79d00a	402	int timed_out = 0;
9db2e455 MG	403	int i;
	404	int n;
	405	int fd_n;
	406	int err;
	407
	408	errno = 0;
	409
	410	memset(&tv, 0, sizeof(tv));
	411	err = libusb_get_next_timeout(NULL, &tv);
	412	if (err < 0) {
	413	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	414	errno = EIO;
	415	return -1;
	416	} else if (err == 0) {
	417	/* No pending timeout or a sane platform */
	418	tv.tv_sec = timeout;
	419	} else {
	420	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	421	usb_event = 1;
ec30827c MG	422	} else if (tv.tv_sec > timeout) {
	423	tv.tv_sec = timeout;
	424	tv.tv_usec = 0;
9db2e455 MG	425	}
	426	}
	427
	428	if (!usb_event) {
	429	for (i = 0; i < dev->n_pfd; i++) {
	430	dev->pfd[i].revents = 0;
	431	}
	432
	433	n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
	434	if (n < 0) {
	435	perror("poll");
816f5cd2	436	errno = 0;
9db2e455 MG	437	return -1;
	438	} else if (n == 0) {
	439	usb_event = 1;
1e79d00a	440	timed_out = 1;
9db2e455 MG	441	} else {
	442	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	443	if (dev->pfd[fd_n].revents) {
	444	if (fd_n < dev->n_usb_pfd) {
	445	usb_event = 1;
	446	break;
	447	} else {
816f5cd2	448	errno = 0;
9db2e455 MG	449	return dev->pfd[fd_n].fd;
	450	}
	451	}
	452	}
	453	}
	454	}
	455
	456	if (usb_event) {
	457	memset(&tv, 0, sizeof(tv));
	458	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	459	if (err < 0) {
27bb301b	460	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	461	errno = EIO;
	462	return -1;
	463	}
	464	}
	465
816f5cd2 MG	466	errno = 0;
	467	if (quit) {
	468	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	469	errno = quit;
816f5cd2	470	}
9db2e455	471
1e79d00a MG	472	if (timed_out)
	473	errno = ETIMEDOUT;
	474
9db2e455 MG	475	return -1;
9db2e455 MG	476	}
813afd12 MG	477
	478	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	479	{
	480	int err;
	481
	482	if (dev->transfer) {
	483	libusb_cancel_transfer(dev->transfer);
	484	}
	485
	486	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	487	if ((err != 0)) {
	488	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	489	}
	490
	491	libusb_close(dev->usb_devh);
e0a7146e	492	free(dev->pfd);
813afd12 MG	493	free(dev);
	494
	495	libusb_exit(NULL);
	496	}
e75295bb MG	497
	498	void hmcfgusb_set_debug(int d)
	499	{
	500	debug = d;
	501	}