[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;
static int libusb_initialized = 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(int vid, int pid) {
	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 == vid) && (desc.idProduct == pid)) {
			libusb_device *dev = list[i];

			err = libusb_open(dev, &devh);
			if (err) {
				fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
				libusb_free_device_list(list, 1);
				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));
				libusb_close(devh);
				libusb_free_device_list(list, 1);
				return NULL;
			}

			err = libusb_claim_interface(devh, INTERFACE);
			if ((err != 0)) {
				fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
				libusb_close(devh);
				libusb_free_device_list(list, 1);
				return NULL;
			}

			libusb_free_device_list(list, 0);
			return devh;
		}

	}

	libusb_free_device_list(list, 1);
	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, int in_size)
{
	unsigned char *data_buf;
	struct libusb_transfer *transfer;
	int err;

	data_buf = malloc(in_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, in_size, cb, data, USB_TIMEOUT);

	transfer->flags = 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) {
			if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
				fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));

			quit = EIO;
			goto out;
		}
	} 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;
				goto out;
			}
		} 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));
		goto out;
	}

	return;

out:
	libusb_free_transfer(transfer);
	if (cb_data) {
		if (cb_data->dev && cb_data->dev->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 bootloader = 0;
	int err;
	int i;

	if (!libusb_initialized) {
		err = libusb_init(NULL);
		if (err != 0) {
			fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
			return NULL;
		}
	}
	libusb_initialized = 1;

	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT);
	if (!devh) {
		devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL);
		if (!devh) {
			fprintf(stderr, "Can't find/open hmcfgusb!\n");
#ifdef NEED_LIBUSB_EXIT
			hmcfgusb_exit();
#endif
			return NULL;
		}
		bootloader = 1;
	}

	dev = malloc(sizeof(struct hmcfgusb_dev));
	if (!dev) {
		perror("Can't allocate memory for hmcfgusb_dev");
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	dev->usb_devh = devh;
	dev->bootloader = bootloader;
	dev->opened_at = time(NULL);

	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	if (!cb_data) {
		perror("Can't allocate memory for hmcfgusb_cb_data");
		free(dev);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		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, ASYNC_SIZE);

	if (!dev->transfer) {
		fprintf(stderr, "Can't prepare async device io!\n");
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		return NULL;
	}

	usb_pfd = libusb_get_pollfds(NULL);
	if (!usb_pfd) {
		fprintf(stderr, "Can't get FDset from libusb!\n");
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		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");
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
		free(dev);
		free(cb_data);
		libusb_close(devh);
#ifdef NEED_LIBUSB_EXIT
		hmcfgusb_exit();
#endif
		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 */
	} else {
		if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
			usb_event = 1;
		} else if ((tv.tv_sec * 1000) < timeout) {
			timeout = tv.tv_sec * 1000;
		}
	}

	if (!usb_event) {
		for (i = 0; i < dev->n_pfd; i++) {
			dev->pfd[i].revents = 0;
		}

		n = poll(dev->pfd, dev->n_pfd, timeout);
		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_enter_bootloader(struct hmcfgusb_dev *dev)
{
	uint8_t out[ASYNC_SIZE];

	if (dev->bootloader) {
		fprintf(stderr, "request for bootloader mode, but device already in bootloader!\n");
		return;
	}

	memset(out, 0, sizeof(out));
	out[0] = 'B';
	hmcfgusb_send(dev, out, sizeof(out), 1);

	return;
}

void hmcfgusb_leave_bootloader(struct hmcfgusb_dev *dev)
{
	uint8_t out[ASYNC_SIZE];

	if (!dev->bootloader) {
		fprintf(stderr, "request for leaving bootloader mode, but device already in normal mode!\n");
		return;
	}

	memset(out, 0, sizeof(out));
	out[0] = 'K';
	hmcfgusb_send(dev, out, sizeof(out), 1);

	return;
}

void hmcfgusb_close(struct hmcfgusb_dev *dev)
{
	int err;

	if (dev->transfer) {
		libusb_cancel_transfer(dev->transfer);
		libusb_handle_events(NULL);
	}

	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);
#ifdef NEED_LIBUSB_EXIT
	hmcfgusb_exit();
#endif
	free(dev->pfd);
	free(dev);
}

void hmcfgusb_exit(void)
{
	if (libusb_initialized) {
		libusb_exit(NULL);
		libusb_initialized = 0;
	}
}

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;
018f85fa	61	static int libusb_initialized = 0;
9db2e455 MG	62
	63	/* Not in all libusb-1.0 versions, so we have to roll our own :-( */
	64	static char * usb_strerror(int e)
	65	{
	66	static char unknerr[256];
	67
	68	switch (e) {
	69	case LIBUSB_SUCCESS:
	70	return "Success";
	71	case LIBUSB_ERROR_IO:
	72	return "Input/output error";
	73	case LIBUSB_ERROR_INVALID_PARAM:
	74	return "Invalid parameter";
	75	case LIBUSB_ERROR_ACCESS:
	76	return "Access denied (insufficient permissions)";
	77	case LIBUSB_ERROR_NO_DEVICE:
	78	return "No such device (it may have been disconnected)";
	79	case LIBUSB_ERROR_NOT_FOUND:
	80	return "Entity not found";
	81	case LIBUSB_ERROR_BUSY:
	82	return "Resource busy";
	83	case LIBUSB_ERROR_TIMEOUT:
	84	return "Operation timed out";
	85	case LIBUSB_ERROR_OVERFLOW:
	86	return "Overflow";
	87	case LIBUSB_ERROR_PIPE:
	88	return "Pipe error";
	89	case LIBUSB_ERROR_INTERRUPTED:
	90	return "System call interrupted (perhaps due to signal)";
	91	case LIBUSB_ERROR_NO_MEM:
	92	return "Insufficient memory";
	93	case LIBUSB_ERROR_NOT_SUPPORTED:
	94	return "Operation not supported or unimplemented on this platform";
	95	case LIBUSB_ERROR_OTHER:
	96	return "Other error";
	97	};
	98	snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
	99	return unknerr;
	100	}
	101
62f25bae	102	static libusb_device_handle *hmcfgusb_find(int vid, int pid) {
9db2e455 MG	103	libusb_device_handle *devh = NULL;
	104	libusb_device **list;
	105	ssize_t cnt;
	106	ssize_t i;
	107	int err;
	108
	109	cnt = libusb_get_device_list(NULL, &list);
	110	if (cnt < 0) {
	111	fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
	112	return NULL;
	113	}
	114
	115	for (i = 0; i < cnt; i++){
	116	struct libusb_device_descriptor desc;
	117
	118	err = libusb_get_device_descriptor(list[i], &desc);
	119	if (err)
	120	continue;
	121
62f25bae	122	if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
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));
018f85fa	128	libusb_free_device_list(list, 1);
9db2e455 MG	129	return NULL;
	130	}
	131
813afd12	132	err = libusb_detach_kernel_driver(devh, INTERFACE);
9db2e455 MG	133	if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
9db2e455 MG	134	fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
018f85fa MG	135	libusb_close(devh);
018f85fa MG	136	libusb_free_device_list(list, 1);
9db2e455 MG	137	return NULL;
	138	}
	139
813afd12	140	err = libusb_claim_interface(devh, INTERFACE);
9db2e455 MG	141	if ((err != 0)) {
9db2e455 MG	142	fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
018f85fa MG	143	libusb_close(devh);
018f85fa MG	144	libusb_free_device_list(list, 1);
9db2e455 MG	145	return NULL;
	146	}
	147
018f85fa	148	libusb_free_device_list(list, 0);
9db2e455 MG	149	return devh;
	150	}
	151
	152	}
	153
018f85fa	154	libusb_free_device_list(list, 1);
9db2e455 MG	155	return NULL;
	156	}
	157
6262005e	158	int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
2a6eaefc MG	159	{
	160	int err;
	161	int cnt;
3435bdb6	162	unsigned char out[0x40];
2a6eaefc	163
3435bdb6 MG	164	memset(out, 0, sizeof(out));
3435bdb6 MG	165
3d5b8e70	166	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
6262005e MG	167	if (err && (!silent)) {
6262005e MG	168	fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
2a6eaefc MG	169	return 0;
	170	}
	171
	172	return 1;
	173	}
	174
9db2e455 MG	175	int hmcfgusb_send(struct hmcfgusb_dev usbdev, unsigned char send_data, int len, int done)
	176	{
	177	int err;
	178	int cnt;
f8718b41 MG	179	struct timeval tv_start, tv_end;
f8718b41 MG	180	int msec;
9db2e455	181
f8718b41	182	if (debug) {
627e3f33	183	hexdump(send_data, len, "USB < ");
f8718b41 MG	184	}
f8718b41 MG	185
d200d8ca MG	186	gettimeofday(&tv_start, NULL);
d200d8ca MG	187
9db2e455 MG	188	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
	189	if (err) {
	190	fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
9db2e455 MG	191	return 0;
	192	}
	193
	194	if (done) {
6262005e	195	if (!hmcfgusb_send_null_frame(usbdev, 0)) {
9db2e455 MG	196	return 0;
	197	}
	198	}
	199
d200d8ca MG	200	gettimeofday(&tv_end, NULL);
	201	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
	202
	203	if (msec > 100) {
6df7655e	204	fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
d200d8ca MG	205	} else if (debug) {
d200d8ca MG	206	fprintf(stderr, "usb-transfer took %dms!\n", msec);
f8718b41 MG	207	}
f8718b41 MG	208
e0a7146e	209	return 1;
9db2e455 MG	210	}
9db2e455 MG	211
b5e57d26	212	static struct libusb_transfer hmcfgusb_prepare_int(libusb_device_handle devh, libusb_transfer_cb_fn cb, void *data, int in_size)
9db2e455 MG	213	{
	214	unsigned char *data_buf;
	215	struct libusb_transfer *transfer;
	216	int err;
	217
b5e57d26	218	data_buf = malloc(in_size);
9db2e455 MG	219	if (!data_buf) {
	220	fprintf(stderr, "Can't allocate memory for data-buffer!\n");
	221	return NULL;
	222	}
	223
	224	transfer = libusb_alloc_transfer(0);
	225	if (!transfer) {
	226	fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
	227	free(data_buf);
	228	return NULL;
	229	}
	230
	231	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
b5e57d26	232	data_buf, in_size, cb, data, USB_TIMEOUT);
9db2e455	233
bafd75c9	234	transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;
9db2e455 MG	235
	236	err = libusb_submit_transfer(transfer);
	237	if (err != 0) {
	238	fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
	239	libusb_free_transfer(transfer);
9db2e455 MG	240	return NULL;
	241	}
	242
	243	return transfer;
	244	}
	245
	246	struct hmcfgusb_cb_data {
813afd12	247	struct hmcfgusb_dev *dev;
9db2e455 MG	248	hmcfgusb_cb_fn cb;
	249	void *data;
	250	};
	251
	252	static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
	253	{
	254	int err;
	255	struct hmcfgusb_cb_data *cb_data;
	256
813afd12 MG	257	cb_data = transfer->user_data;
813afd12 MG	258
9db2e455 MG	259	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
9db2e455 MG	260	if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
018f85fa MG	261	if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
	262	fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
	263
9db2e455	264	quit = EIO;
1c346883	265	goto out;
9db2e455	266	}
9db2e455	267	} else {
27bb301b	268	if (cb_data && cb_data->cb) {
e0a7146e	269	if (debug)
627e3f33	270	hexdump(transfer->buffer, transfer->actual_length, "USB > ");
4371275b MG	271
	272	if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
	273	quit = EIO;
1c346883	274	goto out;
4371275b	275	}
27bb301b	276	} else {
e0a7146e	277	hexdump(transfer->buffer, transfer->actual_length, "> ");
27bb301b	278	}
9db2e455 MG	279	}
	280
	281	err = libusb_submit_transfer(transfer);
	282	if (err != 0) {
	283	fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
1c346883 MG	284	goto out;
	285	}
	286
	287	return;
	288
	289	out:
	290	libusb_free_transfer(transfer);
	291	if (cb_data) {
	292	if (cb_data->dev && cb_data->dev->transfer) {
	293	cb_data->dev->transfer = NULL;
325ed703	294	}
1c346883	295	free(cb_data);
9db2e455 MG	296	}
	297	}
	298
	299	struct hmcfgusb_dev hmcfgusb_init(hmcfgusb_cb_fn cb, void data)
	300	{
	301	libusb_device_handle *devh = NULL;
	302	const struct libusb_pollfd **usb_pfd = NULL;
	303	struct hmcfgusb_dev *dev = NULL;
	304	struct hmcfgusb_cb_data *cb_data = NULL;
62f25bae	305	int bootloader = 0;
9db2e455 MG	306	int err;
	307	int i;
	308
018f85fa MG	309	if (!libusb_initialized) {
	310	err = libusb_init(NULL);
	311	if (err != 0) {
	312	fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
	313	return NULL;
	314	}
9db2e455	315	}
018f85fa	316	libusb_initialized = 1;
9db2e455	317
62f25bae	318	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT);
9db2e455	319	if (!devh) {
62f25bae MG	320	devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL);
	321	if (!devh) {
	322	fprintf(stderr, "Can't find/open hmcfgusb!\n");
018f85fa MG	323	#ifdef NEED_LIBUSB_EXIT
	324	hmcfgusb_exit();
	325	#endif
62f25bae MG	326	return NULL;
	327	}
	328	bootloader = 1;
9db2e455 MG	329	}
	330
	331	dev = malloc(sizeof(struct hmcfgusb_dev));
	332	if (!dev) {
	333	perror("Can't allocate memory for hmcfgusb_dev");
211fd7e5	334	libusb_close(devh);
018f85fa MG	335	#ifdef NEED_LIBUSB_EXIT
	336	hmcfgusb_exit();
	337	#endif
9db2e455 MG	338	return NULL;
	339	}
	340
	341	memset(dev, 0, sizeof(struct hmcfgusb_dev));
	342	dev->usb_devh = devh;
62f25bae MG	343	dev->bootloader = bootloader;
62f25bae MG	344	dev->opened_at = time(NULL);
9db2e455 MG	345
	346	cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
	347	if (!cb_data) {
	348	perror("Can't allocate memory for hmcfgusb_cb_data");
4cadd56d	349	free(dev);
211fd7e5	350	libusb_close(devh);
018f85fa MG	351	#ifdef NEED_LIBUSB_EXIT
	352	hmcfgusb_exit();
	353	#endif
9db2e455 MG	354	return NULL;
	355	}
	356
	357	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
	358
813afd12	359	cb_data->dev = dev;
9db2e455 MG	360	cb_data->cb = cb;
	361	cb_data->data = data;
	362
bafd75c9	363	dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data, ASYNC_SIZE);
b5e57d26	364
9db2e455 MG	365	if (!dev->transfer) {
9db2e455 MG	366	fprintf(stderr, "Can't prepare async device io!\n");
4cadd56d MG	367	free(dev);
4cadd56d MG	368	free(cb_data);
211fd7e5	369	libusb_close(devh);
018f85fa MG	370	#ifdef NEED_LIBUSB_EXIT
	371	hmcfgusb_exit();
	372	#endif
9db2e455 MG	373	return NULL;
	374	}
	375
	376	usb_pfd = libusb_get_pollfds(NULL);
	377	if (!usb_pfd) {
	378	fprintf(stderr, "Can't get FDset from libusb!\n");
018f85fa MG	379	libusb_cancel_transfer(dev->transfer);
018f85fa MG	380	libusb_handle_events(NULL);
9db2e455	381	free(dev);
4cadd56d	382	free(cb_data);
211fd7e5	383	libusb_close(devh);
018f85fa MG	384	#ifdef NEED_LIBUSB_EXIT
	385	hmcfgusb_exit();
	386	#endif
9db2e455 MG	387	return NULL;
	388	}
	389
	390	dev->n_usb_pfd = 0;
	391	for(i = 0; usb_pfd[i]; i++)
	392	dev->n_usb_pfd++;
	393
	394	dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
	395	if (!dev->pfd) {
	396	perror("Can't allocate memory for poll-fds");
018f85fa MG	397	libusb_cancel_transfer(dev->transfer);
018f85fa MG	398	libusb_handle_events(NULL);
4cadd56d MG	399	free(dev);
4cadd56d MG	400	free(cb_data);
211fd7e5	401	libusb_close(devh);
018f85fa MG	402	#ifdef NEED_LIBUSB_EXIT
	403	hmcfgusb_exit();
	404	#endif
9db2e455 MG	405	return NULL;
	406	}
	407
	408	memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
	409
	410	for (i = 0; i < dev->n_usb_pfd; i++) {
	411	dev->pfd[i].fd = usb_pfd[i]->fd;
	412	dev->pfd[i].events = usb_pfd[i]->events;
	413	dev->pfd[i].revents = 0;
	414	}
	415
	416	free(usb_pfd);
	417
	418	dev->n_pfd = dev->n_usb_pfd;
	419
f16395da MG	420	quit = 0;
f16395da MG	421
9db2e455 MG	422	return dev;
	423	}
	424
	425	int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
	426	{
	427	dev->n_pfd++;
	428	dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
	429	if (!dev->pfd) {
	430	perror("Can't realloc poll-fds");
	431	return 0;
	432	}
	433
	434	dev->pfd[dev->n_pfd-1].fd = fd;
	435	dev->pfd[dev->n_pfd-1].events = events;
	436	dev->pfd[dev->n_pfd-1].revents = 0;
	437
	438	return 1;
	439	}
	440
	441	int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
	442	{
	443	struct timeval tv;
	444	int usb_event = 0;
1e79d00a	445	int timed_out = 0;
9db2e455 MG	446	int i;
	447	int n;
	448	int fd_n;
	449	int err;
	450
	451	errno = 0;
	452
	453	memset(&tv, 0, sizeof(tv));
	454	err = libusb_get_next_timeout(NULL, &tv);
	455	if (err < 0) {
	456	fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
	457	errno = EIO;
	458	return -1;
	459	} else if (err == 0) {
	460	/* No pending timeout or a sane platform */
9db2e455 MG	461	} else {
	462	if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
	463	usb_event = 1;
3b35a8c1 MG	464	} else if ((tv.tv_sec * 1000) < timeout) {
3b35a8c1 MG	465	timeout = tv.tv_sec * 1000;
9db2e455 MG	466	}
	467	}
	468
	469	if (!usb_event) {
	470	for (i = 0; i < dev->n_pfd; i++) {
	471	dev->pfd[i].revents = 0;
	472	}
	473
3b35a8c1	474	n = poll(dev->pfd, dev->n_pfd, timeout);
9db2e455 MG	475	if (n < 0) {
9db2e455 MG	476	perror("poll");
816f5cd2	477	errno = 0;
9db2e455 MG	478	return -1;
	479	} else if (n == 0) {
	480	usb_event = 1;
1e79d00a	481	timed_out = 1;
9db2e455 MG	482	} else {
	483	for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
	484	if (dev->pfd[fd_n].revents) {
	485	if (fd_n < dev->n_usb_pfd) {
	486	usb_event = 1;
	487	break;
	488	} else {
816f5cd2	489	errno = 0;
9db2e455 MG	490	return dev->pfd[fd_n].fd;
	491	}
	492	}
	493	}
	494	}
	495	}
	496
	497	if (usb_event) {
	498	memset(&tv, 0, sizeof(tv));
	499	err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	500	if (err < 0) {
27bb301b	501	fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
9db2e455 MG	502	errno = EIO;
	503	return -1;
	504	}
	505	}
	506
816f5cd2 MG	507	errno = 0;
	508	if (quit) {
	509	fprintf(stderr, "closing device-connection due to error %d\n", quit);
9db2e455	510	errno = quit;
816f5cd2	511	}
9db2e455	512
1e79d00a MG	513	if (timed_out)
	514	errno = ETIMEDOUT;
	515
9db2e455 MG	516	return -1;
9db2e455 MG	517	}
813afd12	518
62f25bae MG	519	void hmcfgusb_enter_bootloader(struct hmcfgusb_dev *dev)
	520	{
	521	uint8_t out[ASYNC_SIZE];
	522
	523	if (dev->bootloader) {
	524	fprintf(stderr, "request for bootloader mode, but device already in bootloader!\n");
	525	return;
	526	}
	527
	528	memset(out, 0, sizeof(out));
	529	out[0] = 'B';
	530	hmcfgusb_send(dev, out, sizeof(out), 1);
	531
	532	return;
	533	}
	534
0ddb3740 MG	535	void hmcfgusb_leave_bootloader(struct hmcfgusb_dev *dev)
	536	{
	537	uint8_t out[ASYNC_SIZE];
	538
	539	if (!dev->bootloader) {
	540	fprintf(stderr, "request for leaving bootloader mode, but device already in normal mode!\n");
	541	return;
	542	}
	543
	544	memset(out, 0, sizeof(out));
	545	out[0] = 'K';
	546	hmcfgusb_send(dev, out, sizeof(out), 1);
	547
	548	return;
	549	}
	550
813afd12 MG	551	void hmcfgusb_close(struct hmcfgusb_dev *dev)
	552	{
	553	int err;
	554
	555	if (dev->transfer) {
	556	libusb_cancel_transfer(dev->transfer);
018f85fa	557	libusb_handle_events(NULL);
813afd12 MG	558	}
	559
	560	err = libusb_release_interface(dev->usb_devh, INTERFACE);
	561	if ((err != 0)) {
	562	fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
	563	}
	564
	565	libusb_close(dev->usb_devh);
018f85fa MG	566	#ifdef NEED_LIBUSB_EXIT
	567	hmcfgusb_exit();
	568	#endif
e0a7146e	569	free(dev->pfd);
813afd12	570	free(dev);
018f85fa	571	}
813afd12	572
018f85fa MG	573	void hmcfgusb_exit(void)
	574	{
	575	if (libusb_initialized) {
	576	libusb_exit(NULL);
	577	libusb_initialized = 0;
	578	}
813afd12	579	}
e75295bb MG	580
	581	void hmcfgusb_set_debug(int d)
	582	{
	583	debug = d;
	584	}