[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 <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(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done)
{
	int err;
	int cnt;

	if (debug)
		hexdump(send_data, len, "USB < ");
	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) {
		err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT);
		if (err) {
			fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
			return 0;
		}
	}

	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>
	32	#include <libusb-1.0/libusb.h>
	33
	34	#include "hexdump.h"
	35	#include "hmcfgusb.h"
	36
813afd12	37	#define USB_TIMEOUT 10000
9db2e455 MG	38
	39	#define ID_VENDOR 0x1b1f
	40	#define ID_PRODUCT 0xc00f
	41
	42	/* TODO: dynamic */
	43	#define ASYNC_SIZE 0x0040
	44	#define ASYNC_INTERVAL 32
	45
	46	#define EP_OUT 0x02
	47	#define EP_IN 0x83
	48
813afd12 MG	49	#define INTERFACE 0
813afd12 MG	50
9db2e455	51	static int quit = 0;
e75295bb	52	static int debug = 0;
9db2e455 MG	53
	54	/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
	55	static char * usb_strerror(int e)
	56	{
	57	static char unknerr[256];
	58
	59	switch (e) {
	60	case LIBUSB_SUCCESS:
	61	return "Success";
	62	case LIBUSB_ERROR_IO:
	63	return "Input/output error";
	64	case LIBUSB_ERROR_INVALID_PARAM:
	65	return "Invalid parameter";
	66	case LIBUSB_ERROR_ACCESS:
	67	return "Access denied (insufficient permissions)";
	68	case LIBUSB_ERROR_NO_DEVICE:
	69	return "No such device (it may have been disconnected)";
	70	case LIBUSB_ERROR_NOT_FOUND:
	71	return "Entity not found";
	72	case LIBUSB_ERROR_BUSY:
	73	return "Resource busy";
	74	case LIBUSB_ERROR_TIMEOUT:
	75	return "Operation timed out";
	76	case LIBUSB_ERROR_OVERFLOW:
	77	return "Overflow";
	78	case LIBUSB_ERROR_PIPE:
	79	return "Pipe error";
	80	case LIBUSB_ERROR_INTERRUPTED:
	81	return "System call interrupted (perhaps due to signal)";
	82	case LIBUSB_ERROR_NO_MEM:
	83	return "Insufficient memory";
	84	case LIBUSB_ERROR_NOT_SUPPORTED:
	85	return "Operation not supported or unimplemented on this platform";
	86	case LIBUSB_ERROR_OTHER:
	87	return "Other error";
	88	};
	89	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	90	return unknerr;
	91	}
	92
	93	static libusb_device_handle *hmcfgusb_find() {
	94	libusb_device_handle *devh = NULL;
	95	libusb_device **list;
	96	ssize_t cnt;
	97	ssize_t i;
	98	int err;
	99
	100	cnt = libusb_get_device_list(NULL, &list);
	101	if (cnt < 0) {
	102	fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
	103	return NULL;
	104	}
	105
	106	for (i = 0; i < cnt; i++){
	107	struct libusb_device_descriptor desc;
	108
	109	err = libusb_get_device_descriptor(list[i], &desc);
	110	if (err)
	111	continue;
	112
	113	if ((desc.idVendor == ID_VENDOR) && (desc.idProduct == ID_PRODUCT)) {
	114	libusb_device *dev = list[i];
	115
	116	err = libusb_open(dev, &devh);
117	if (err) {
118	fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
119	return NULL;
120	}
121
813afd12	122	err = libusb_detach_kernel_driver(devh, INTERFACE);
9db2e455 MG	123	if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
	124	fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
	125	return NULL;
	126	}
	127
813afd12	128	err = libusb_claim_interface(devh, INTERFACE);
9db2e455 MG	129	if ((err != 0)) {
	130	fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
	131	return NULL;
	132	}
	133
	134	return devh;
	135	}
	136
	137	}
	138
	139	return NULL;
	140	}
	141
	142	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	143	{
	144	int err;
	145	int cnt;
9db2e455	146
e0a7146e	147	if (debug)
627e3f33	148	hexdump(send_data, len, "USB < ");
9db2e455 MG	149	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	150	if (err) {
	151	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	152	return 0;
	153	}
	154
	155	if (done) {
	156	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT);
	157	if (err) {
	158	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	159	return 0;
	160	}
	161	}
	162
e0a7146e	163	return 1;
9db2e455 MG	164	}
	165
	166	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data)
	167	{
	168	unsigned char *data_buf;
	169	struct libusb_transfer *transfer;
	170	int err;
	171
	172	data_buf = malloc(ASYNC_SIZE);
	173	if (!data_buf) {
	174	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	175	return NULL;
	176	}
	177
	178	transfer = libusb_alloc_transfer(0);
	179	if (!transfer) {
	180	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	181	free(data_buf);
	182	return NULL;
	183	}
	184
	185	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
	186	data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
	187
813afd12	188	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK \| LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	189
	190	err = libusb_submit_transfer(transfer);
	191	if (err != 0) {
	192	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	193	libusb_free_transfer(transfer);
9db2e455 MG	194	return NULL;
	195	}
	196
	197	return transfer;
	198	}
	199
	200	struct hmcfgusb_cb_data {
813afd12	201	struct hmcfgusb_dev *dev;
9db2e455 MG	202	hmcfgusb_cb_fn cb;
	203	void *data;
	204	};
	205
	206	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	207	{
	208	int err;
	209	struct hmcfgusb_cb_data *cb_data;
	210
813afd12 MG	211	cb_data = transfer->user_data;
813afd12 MG	212
9db2e455 MG	213	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
	214	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
	215	fprintf(stderr, "Interrupt transfer not completed: %d!\n", transfer->status);
	216	quit = EIO;
813afd12 MG	217
	218	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	219	libusb_free_transfer(cb_data->dev->transfer);
	220	cb_data->dev->transfer = NULL;
4cadd56d	221	free(cb_data);
813afd12	222	}
9db2e455 MG	223	return;
9db2e455 MG	224	}
9db2e455	225	} else {
27bb301b	226	if (cb_data && cb_data->cb) {
e0a7146e	227	if (debug)
627e3f33	228	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	229
	230	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	231	quit = EIO;
	232
	233	if (cb_data && cb_data->dev && cb_data->dev->transfer) {
	234	libusb_free_transfer(cb_data->dev->transfer);
	235	cb_data->dev->transfer = NULL;
4cadd56d	236	free(cb_data);
4371275b MG	237	}
	238
	239	return;
	240	}
27bb301b	241	} else {
e0a7146e	242	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	243	}
9db2e455 MG	244	}
	245
	246	err = libusb_submit_transfer(transfer);
	247	if (err != 0) {
	248	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
9db2e455	249	libusb_free_transfer(transfer);
4cadd56d MG	250	cb_data->dev->transfer = NULL;
4cadd56d MG	251	free(cb_data);
9db2e455 MG	252	}
	253	}
	254
	255	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data)
	256	{
	257	libusb_device_handle *devh = NULL;
	258	const struct libusb_pollfd **usb_pfd = NULL;
	259	struct hmcfgusb_dev *dev = NULL;
	260	struct hmcfgusb_cb_data *cb_data = NULL;
	261	int err;
	262	int i;
	263
	264	err = libusb_init(NULL);
	265	if (err != 0) {
	266	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	267	return NULL;
	268	}
	269
	270	devh = hmcfgusb_find();
	271	if (!devh) {
	272	fprintf(stderr, "Can't find/open hmcfgusb!\n");
	273	return NULL;
	274	}
	275
	276	dev = malloc(sizeof(struct hmcfgusb_dev));
	277	if (!dev) {
	278	perror("Can't allocate memory for hmcfgusb_dev");
	279	return NULL;
	280	}
	281
	282	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	283	dev->usb_devh = devh;
	284
	285	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	286	if (!cb_data) {
	287	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	288	free(dev);
9db2e455 MG	289	return NULL;
	290	}
	291
	292	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	293
813afd12	294	cb_data->dev = dev;
9db2e455 MG	295	cb_data->cb = cb;
	296	cb_data->data = data;
	297
	298	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
	299	if (!dev->transfer) {
	300	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	301	free(dev);
4cadd56d MG	302	free(cb_data);
9db2e455 MG	303	return NULL;
	304	}
	305
	306	usb_pfd = libusb_get_pollfds(NULL);
	307	if (!usb_pfd) {
	308	fprintf(stderr, "Can't get FDset from libusb!\n");
	309	free(dev);
4cadd56d	310	free(cb_data);
9db2e455 MG	311	return NULL;
	312	}
	313
	314	dev->n_usb_pfd = 0;
	315	for(i = 0; usb_pfd[i]; i++)
	316	dev->n_usb_pfd++;
	317
	318	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	319	if (!dev->pfd) {
	320	perror("Can't allocate memory for poll-fds");
4cadd56d MG	321	free(dev);
4cadd56d MG	322	free(cb_data);
9db2e455 MG	323	return NULL;
	324	}
	325
	326	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	327
	328	for (i = 0; i < dev->n_usb_pfd; i++) {
	329	dev->pfd[i].fd = usb_pfd[i]->fd;
	330	dev->pfd[i].events = usb_pfd[i]->events;
	331	dev->pfd[i].revents = 0;
	332	}
	333
	334	free(usb_pfd);
	335
	336	dev->n_pfd = dev->n_usb_pfd;
	337
f16395da MG	338	quit = 0;
f16395da MG	339
9db2e455 MG	340	return dev;
	341	}
	342
	343	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	344	{
	345	dev->n_pfd++;
	346	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	347	if (!dev->pfd) {
	348	perror("Can't realloc poll-fds");
	349	return 0;
	350	}
	351
	352	dev->pfd[dev->n_pfd-1].fd = fd;
	353	dev->pfd[dev->n_pfd-1].events = events;
	354	dev->pfd[dev->n_pfd-1].revents = 0;
	355
	356	return 1;
	357	}
	358
	359	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	360	{
	361	struct timeval tv;
	362	int usb_event = 0;
	363	int i;
	364	int n;
	365	int fd_n;
	366	int err;
	367
	368	errno = 0;
	369
	370	memset(&tv, 0, sizeof(tv));
	371	err = libusb_get_next_timeout(NULL, &tv);
	372	if (err < 0) {
	373	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	374	errno = EIO;
	375	return -1;
	376	} else if (err == 0) {
	377	/* No pending timeout or a sane platform */
	378	tv.tv_sec = timeout;
	379	} else {
	380	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	381	usb_event = 1;
	382	}
	383	}
	384
	385	if (!usb_event) {
	386	for (i = 0; i < dev->n_pfd; i++) {
	387	dev->pfd[i].revents = 0;
	388	}
	389
	390	n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
	391	if (n < 0) {
	392	perror("poll");
816f5cd2	393	errno = 0;
9db2e455 MG	394	return -1;
	395	} else if (n == 0) {
	396	usb_event = 1;
	397	} else {
	398	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	399	if (dev->pfd[fd_n].revents) {
	400	if (fd_n < dev->n_usb_pfd) {
	401	usb_event = 1;
	402	break;
	403	} else {
816f5cd2	404	errno = 0;
9db2e455 MG	405	return dev->pfd[fd_n].fd;
	406	}
	407	}
	408	}
	409	}
	410	}
	411
	412	if (usb_event) {
	413	memset(&tv, 0, sizeof(tv));
	414	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	415	if (err < 0) {
27bb301b	416	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	417	errno = EIO;
	418	return -1;
	419	}
	420	}
	421
816f5cd2 MG	422	errno = 0;
	423	if (quit) {
	424	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	425	errno = quit;
816f5cd2	426	}
9db2e455 MG	427
	428	return -1;
	429	}
813afd12 MG	430
	431	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	432	{
	433	int err;
	434
	435	if (dev->transfer) {
	436	libusb_cancel_transfer(dev->transfer);
	437	}
	438
	439	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	440	if ((err != 0)) {
	441	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	442	}
	443
	444	libusb_close(dev->usb_devh);
e0a7146e	445	free(dev->pfd);
813afd12 MG	446	free(dev);
	447
	448	libusb_exit(NULL);
	449	}
e75295bb MG	450
	451	void hmcfgusb_set_debug(int d)
	452	{
	453	debug = d;
	454	}