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/*
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 * libusb example program to manipulate U.are.U 4000B fingerprint scanner.
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 * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org></dsd@gentoo.org>
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 *
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 * Basic image capture program only, does not consider the powerup quirks or
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 * the fact that image encryption may be enabled. Not expected to work
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 * flawlessly all of the time.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <errno.h></errno.h>
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#include <pthread.h></pthread.h>
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#include <signal.h></signal.h>
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#include <string.h></string.h>
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#include <stdio.h></stdio.h>
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#include <stdlib.h></stdlib.h>
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#include <libusb.h></libusb.h>
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#define EP_INTR			(1 | LIBUSB_ENDPOINT_IN)
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#define EP_DATA			(2 | LIBUSB_ENDPOINT_IN)
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#define CTRL_IN			(LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
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#define CTRL_OUT		(LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
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#define USB_RQ			0x04
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#define INTR_LENGTH		64
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enum {
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	MODE_INIT = 0x00,
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	MODE_AWAIT_FINGER_ON = 0x10,
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	MODE_AWAIT_FINGER_OFF = 0x12,
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	MODE_CAPTURE = 0x20,
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	MODE_SHUT_UP = 0x30,
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	MODE_READY = 0x80,
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};
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static int next_state(void);
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enum {
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	STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON = 1,
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	STATE_AWAIT_IRQ_FINGER_DETECTED,
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	STATE_AWAIT_MODE_CHANGE_CAPTURE,
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	STATE_AWAIT_IMAGE,
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	STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF,
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	STATE_AWAIT_IRQ_FINGER_REMOVED,
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};
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static int state = 0;
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static struct libusb_device_handle *devh = NULL;
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static unsigned char imgbuf[0x1b340];
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static unsigned char irqbuf[INTR_LENGTH];
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static struct libusb_transfer *img_transfer = NULL;
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static struct libusb_transfer *irq_transfer = NULL;
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static int img_idx = 0;
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static int do_exit = 0;
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static pthread_t poll_thread;
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static pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
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static pthread_mutex_t exit_cond_lock = PTHREAD_MUTEX_INITIALIZER;
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static void request_exit(int code)
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{
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	do_exit = code;
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	pthread_cond_signal(&exit_cond);
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}
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static void *poll_thread_main(void *arg)
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{
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	int r = 0;
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	printf("poll thread running\n");
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	while (!do_exit) {
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		struct timeval tv = { 1, 0 };
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		r = libusb_handle_events_timeout(NULL, &tv);
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		if (r < 0) {
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			request_exit(2);
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			break;
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		}
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	}
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	printf("poll thread shutting down\n");
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	return NULL;
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}
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static int find_dpfp_device(void)
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{
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	devh = libusb_open_device_with_vid_pid(NULL, 0x05ba, 0x000a);
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	return devh ? 0 : -EIO;
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}
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static int print_f0_data(void)
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{
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	unsigned char data[0x10];
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	int r;
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	unsigned int i;
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	r = libusb_control_transfer(devh, CTRL_IN, USB_RQ, 0xf0, 0, data,
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		sizeof(data), 0);
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	if (r < 0) {
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		fprintf(stderr, "F0 error %d\n", r);
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		return r;
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	}
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	if ((unsigned int) r < sizeof(data)) {
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		fprintf(stderr, "short read (%d)\n", r);
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		return -1;
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	}
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	printf("F0 data:");
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	for (i = 0; i < sizeof(data); i++)
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		printf("%02x ", data[i]);
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	printf("\n");
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	return 0;
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}
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static int get_hwstat(unsigned char *status)
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{
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	int r;
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	r = libusb_control_transfer(devh, CTRL_IN, USB_RQ, 0x07, 0, status, 1, 0);
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	if (r < 0) {
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		fprintf(stderr, "read hwstat error %d\n", r);
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		return r;
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	}
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	if ((unsigned int) r < 1) {
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		fprintf(stderr, "short read (%d)\n", r);
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		return -1;
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	}
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	printf("hwstat reads %02x\n", *status);
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	return 0;
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}
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static int set_hwstat(unsigned char data)
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{
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	int r;
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	printf("set hwstat to %02x\n", data);
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	r = libusb_control_transfer(devh, CTRL_OUT, USB_RQ, 0x07, 0, &data, 1, 0);
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	if (r < 0) {
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		fprintf(stderr, "set hwstat error %d\n", r);
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		return r;
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	}
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	if ((unsigned int) r < 1) {
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		fprintf(stderr, "short write (%d)", r);
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		return -1;
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	}
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	return 0;
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}
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static int set_mode(unsigned char data)
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{
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	int r;
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	printf("set mode %02x\n", data);
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	r = libusb_control_transfer(devh, CTRL_OUT, USB_RQ, 0x4e, 0, &data, 1, 0);
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	if (r < 0) {
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		fprintf(stderr, "set mode error %d\n", r);
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		return r;
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	}
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	if ((unsigned int) r < 1) {
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		fprintf(stderr, "short write (%d)", r);
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		return -1;
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	}
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	return 0;
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}
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static void LIBUSB_CALL cb_mode_changed(struct libusb_transfer *transfer)
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{
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	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
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		fprintf(stderr, "mode change transfer not completed!\n");
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		request_exit(2);
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	}
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	printf("async cb_mode_changed length=%d actual_length=%d\n",
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		transfer->length, transfer->actual_length);
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	if (next_state() < 0)
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		request_exit(2);
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}
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static int set_mode_async(unsigned char data)
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{
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	unsigned char *buf = malloc(LIBUSB_CONTROL_SETUP_SIZE + 1);
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	struct libusb_transfer *transfer;
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	if (!buf)
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		return -ENOMEM;
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	transfer = libusb_alloc_transfer(0);
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	if (!transfer) {
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		free(buf);
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		return -ENOMEM;
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	}
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	printf("async set mode %02x\n", data);
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	libusb_fill_control_setup(buf, CTRL_OUT, USB_RQ, 0x4e, 0, 1);
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	buf[LIBUSB_CONTROL_SETUP_SIZE] = data;
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	libusb_fill_control_transfer(transfer, devh, buf, cb_mode_changed, NULL,
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		1000);
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	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK
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		| LIBUSB_TRANSFER_FREE_BUFFER | LIBUSB_TRANSFER_FREE_TRANSFER;
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	return libusb_submit_transfer(transfer);
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}
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static int do_sync_intr(unsigned char *data)
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{
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	int r;
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	int transferred;
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	r = libusb_interrupt_transfer(devh, EP_INTR, data, INTR_LENGTH,
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		&transferred, 1000);
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	if (r < 0) {
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		fprintf(stderr, "intr error %d\n", r);
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		return r;
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	}
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	if (transferred < INTR_LENGTH) {
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		fprintf(stderr, "short read (%d)\n", r);
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		return -1;
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	}
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	printf("recv interrupt %04x\n", *((uint16_t *) data));
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	return 0;
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}
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static int sync_intr(unsigned char type)
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{
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	int r;
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	unsigned char data[INTR_LENGTH];
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	while (1) {
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		r = do_sync_intr(data);
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		if (r < 0)
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			return r;
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		if (data[0] == type)
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			return 0;
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	}
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}
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static int save_to_file(unsigned char *data)
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{
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	FILE *fd;
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	char filename[64];
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	snprintf(filename, sizeof(filename), "finger%d.pgm", img_idx++);
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	fd = fopen(filename, "w");
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	if (!fd)
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		return -1;
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	fputs("P5 384 289 255 ", fd);
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	(void) fwrite(data + 64, 1, 384*289, fd);
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	fclose(fd);
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	printf("saved image to %s\n", filename);
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	return 0;
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}
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static int next_state(void)
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{
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	int r = 0;
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	printf("old state: %d\n", state);
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	switch (state) {
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	case STATE_AWAIT_IRQ_FINGER_REMOVED:
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		state = STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON;
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		r = set_mode_async(MODE_AWAIT_FINGER_ON);
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		break;
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	case STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON:
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		state = STATE_AWAIT_IRQ_FINGER_DETECTED;
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		break;
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	case STATE_AWAIT_IRQ_FINGER_DETECTED:
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		state = STATE_AWAIT_MODE_CHANGE_CAPTURE;
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		r = set_mode_async(MODE_CAPTURE);
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		break;
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	case STATE_AWAIT_MODE_CHANGE_CAPTURE:
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		state = STATE_AWAIT_IMAGE;
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		break;
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	case STATE_AWAIT_IMAGE:
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		state = STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF;
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		r = set_mode_async(MODE_AWAIT_FINGER_OFF);
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		break;
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	case STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF:
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		state = STATE_AWAIT_IRQ_FINGER_REMOVED;
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		break;
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	default:
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		printf("unrecognised state %d\n", state);
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	}
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	if (r < 0) {
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		fprintf(stderr, "error detected changing state\n");
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		return r;
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	}
kusano 7d535a
kusano 7d535a
	printf("new state: %d\n", state);
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	return 0;
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}
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static void LIBUSB_CALL cb_irq(struct libusb_transfer *transfer)
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{
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	unsigned char irqtype = transfer->buffer[0];
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	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
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		fprintf(stderr, "irq transfer status %d?\n", transfer->status);
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		irq_transfer = NULL;
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		request_exit(2);
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		return;
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	}
kusano 7d535a
kusano 7d535a
	printf("IRQ callback %02x\n", irqtype);
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	switch (state) {
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	case STATE_AWAIT_IRQ_FINGER_DETECTED:
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		if (irqtype == 0x01) {
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			if (next_state() < 0) {
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				request_exit(2);
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				return;
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			}
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		} else {
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			printf("finger-on-sensor detected in wrong state!\n");
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		}
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		break;
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	case STATE_AWAIT_IRQ_FINGER_REMOVED:
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		if (irqtype == 0x02) {
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			if (next_state() < 0) {
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				request_exit(2);
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				return;
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			}
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		} else {
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			printf("finger-on-sensor detected in wrong state!\n");
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		}
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		break;
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	}
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	if (libusb_submit_transfer(irq_transfer) < 0)
kusano 7d535a
		request_exit(2);
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}
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static void LIBUSB_CALL cb_img(struct libusb_transfer *transfer)
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{
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	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
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		fprintf(stderr, "img transfer status %d?\n", transfer->status);
kusano 7d535a
		img_transfer = NULL;
kusano 7d535a
		request_exit(2);
kusano 7d535a
		return;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	printf("Image callback\n");
kusano 7d535a
	save_to_file(imgbuf);
kusano 7d535a
	if (next_state() < 0) {
kusano 7d535a
		request_exit(2);
kusano 7d535a
		return;
kusano 7d535a
	}
kusano 7d535a
	if (libusb_submit_transfer(img_transfer) < 0)
kusano 7d535a
		request_exit(2);
kusano 7d535a
}
kusano 7d535a
kusano 7d535a
static int init_capture(void)
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{
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	int r;
kusano 7d535a
kusano 7d535a
	r = libusb_submit_transfer(irq_transfer);
kusano 7d535a
	if (r < 0)
kusano 7d535a
		return r;
kusano 7d535a
kusano 7d535a
	r = libusb_submit_transfer(img_transfer);
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		libusb_cancel_transfer(irq_transfer);
kusano 7d535a
		while (irq_transfer)
kusano 7d535a
			if (libusb_handle_events(NULL) < 0)
kusano 7d535a
				break;
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		return r;
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	}
kusano 7d535a
kusano 7d535a
	/* start state machine */
kusano 7d535a
	state = STATE_AWAIT_IRQ_FINGER_REMOVED;
kusano 7d535a
	return next_state();
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}
kusano 7d535a
kusano 7d535a
static int do_init(void)
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{
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	unsigned char status;
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	int r;
kusano 7d535a
kusano 7d535a
	r = get_hwstat(&status);
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	if (r < 0)
kusano 7d535a
		return r;
kusano 7d535a
kusano 7d535a
	if (!(status & 0x80)) {
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		r = set_hwstat(status | 0x80);
kusano 7d535a
		if (r < 0)
kusano 7d535a
			return r;
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		r = get_hwstat(&status);
kusano 7d535a
		if (r < 0)
kusano 7d535a
			return r;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	status &= ~0x80;
kusano 7d535a
	r = set_hwstat(status);
kusano 7d535a
	if (r < 0)
kusano 7d535a
		return r;
kusano 7d535a
kusano 7d535a
	r = get_hwstat(&status);
kusano 7d535a
	if (r < 0)
kusano 7d535a
		return r;
kusano 7d535a
kusano 7d535a
	r = sync_intr(0x56);
kusano 7d535a
	if (r < 0)
kusano 7d535a
		return r;
kusano 7d535a
kusano 7d535a
	return 0;
kusano 7d535a
}
kusano 7d535a
kusano 7d535a
static int alloc_transfers(void)
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{
kusano 7d535a
	img_transfer = libusb_alloc_transfer(0);
kusano 7d535a
	if (!img_transfer)
kusano 7d535a
		return -ENOMEM;
kusano 7d535a
kusano 7d535a
	irq_transfer = libusb_alloc_transfer(0);
kusano 7d535a
	if (!irq_transfer)
kusano 7d535a
		return -ENOMEM;
kusano 7d535a
kusano 7d535a
	libusb_fill_bulk_transfer(img_transfer, devh, EP_DATA, imgbuf,
kusano 7d535a
		sizeof(imgbuf), cb_img, NULL, 0);
kusano 7d535a
	libusb_fill_interrupt_transfer(irq_transfer, devh, EP_INTR, irqbuf,
kusano 7d535a
		sizeof(irqbuf), cb_irq, NULL, 0);
kusano 7d535a
kusano 7d535a
	return 0;
kusano 7d535a
}
kusano 7d535a
kusano 7d535a
static void sighandler(int signum)
kusano 7d535a
{
kusano 7d535a
	request_exit(1);
kusano 7d535a
}
kusano 7d535a
kusano 7d535a
int main(void)
kusano 7d535a
{
kusano 7d535a
	struct sigaction sigact;
kusano 7d535a
	int r = 1;
kusano 7d535a
kusano 7d535a
	r = libusb_init(NULL);
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		fprintf(stderr, "failed to initialise libusb\n");
kusano 7d535a
		exit(1);
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	r = find_dpfp_device();
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		fprintf(stderr, "Could not find/open device\n");
kusano 7d535a
		goto out;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	r = libusb_claim_interface(devh, 0);
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		fprintf(stderr, "usb_claim_interface error %d %s\n", r, strerror(-r));
kusano 7d535a
		goto out;
kusano 7d535a
	}
kusano 7d535a
	printf("claimed interface\n");
kusano 7d535a
kusano 7d535a
	r = print_f0_data();
kusano 7d535a
	if (r < 0)
kusano 7d535a
		goto out_release;
kusano 7d535a
kusano 7d535a
	r = do_init();
kusano 7d535a
	if (r < 0)
kusano 7d535a
		goto out_deinit;
kusano 7d535a
kusano 7d535a
	/* async from here onwards */
kusano 7d535a
kusano 7d535a
	sigact.sa_handler = sighandler;
kusano 7d535a
	sigemptyset(&sigact.sa_mask);
kusano 7d535a
	sigact.sa_flags = 0;
kusano 7d535a
	sigaction(SIGINT, &sigact, NULL);
kusano 7d535a
	sigaction(SIGTERM, &sigact, NULL);
kusano 7d535a
	sigaction(SIGQUIT, &sigact, NULL);
kusano 7d535a
kusano 7d535a
	r = pthread_create(&poll_thread, NULL, poll_thread_main, NULL);
kusano 7d535a
	if (r)
kusano 7d535a
		goto out_deinit;
kusano 7d535a
kusano 7d535a
	r = alloc_transfers();
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		request_exit(1);
kusano 7d535a
		pthread_join(poll_thread, NULL);
kusano 7d535a
		goto out_deinit;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	r = init_capture();
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		request_exit(1);
kusano 7d535a
		pthread_join(poll_thread, NULL);
kusano 7d535a
		goto out_deinit;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	while (!do_exit) {
kusano 7d535a
		pthread_mutex_lock(&exit_cond_lock);
kusano 7d535a
		pthread_cond_wait(&exit_cond, &exit_cond_lock);
kusano 7d535a
		pthread_mutex_unlock(&exit_cond_lock);
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	printf("shutting down...\n");
kusano 7d535a
	pthread_join(poll_thread, NULL);
kusano 7d535a
kusano 7d535a
	r = libusb_cancel_transfer(irq_transfer);
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		request_exit(1);
kusano 7d535a
		goto out_deinit;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	r = libusb_cancel_transfer(img_transfer);
kusano 7d535a
	if (r < 0) {
kusano 7d535a
		request_exit(1);
kusano 7d535a
		goto out_deinit;
kusano 7d535a
	}
kusano 7d535a
kusano 7d535a
	while (img_transfer || irq_transfer)
kusano 7d535a
		if (libusb_handle_events(NULL) < 0)
kusano 7d535a
			break;
kusano 7d535a
kusano 7d535a
	if (do_exit == 1)
kusano 7d535a
		r = 0;
kusano 7d535a
	else
kusano 7d535a
		r = 1;
kusano 7d535a
kusano 7d535a
out_deinit:
kusano 7d535a
	libusb_free_transfer(img_transfer);
kusano 7d535a
	libusb_free_transfer(irq_transfer);
kusano 7d535a
	set_mode(0);
kusano 7d535a
	set_hwstat(0x80);
kusano 7d535a
out_release:
kusano 7d535a
	libusb_release_interface(devh, 0);
kusano 7d535a
out:
kusano 7d535a
	libusb_close(devh);
kusano 7d535a
	libusb_exit(NULL);
kusano 7d535a
	return r >= 0 ? r : -r;
kusano 7d535a
}
kusano 7d535a