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