examples/dpfp.c

   1 /*
   2  * libusbx example program to manipulate U.are.U 4000B fingerprint scanner.
   3  * Copyright © 2007 Daniel Drake <dsd@gentoo.org>
   4  *
   5  * Basic image capture program only, does not consider the powerup quirks or
   6  * the fact that image encryption may be enabled. Not expected to work
   7  * flawlessly all of the time.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <errno.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29
  30 #include "libusb.h"
  31
  32 #define EP_INTR                 (1 | LIBUSB_ENDPOINT_IN)
  33 #define EP_DATA                 (2 | LIBUSB_ENDPOINT_IN)
  34 #define CTRL_IN                 (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
  35 #define CTRL_OUT                (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
  36 #define USB_RQ                  0x04
  37 #define INTR_LENGTH             64
  38
  39 enum {
  40         MODE_INIT = 0x00,
  41         MODE_AWAIT_FINGER_ON = 0x10,
  42         MODE_AWAIT_FINGER_OFF = 0x12,
  43         MODE_CAPTURE = 0x20,
  44         MODE_SHUT_UP = 0x30,
  45         MODE_READY = 0x80,
  46 };
  47
  48 static int next_state(void);
  49
  50 enum {
  51         STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON = 1,
  52         STATE_AWAIT_IRQ_FINGER_DETECTED,
  53         STATE_AWAIT_MODE_CHANGE_CAPTURE,
  54         STATE_AWAIT_IMAGE,
  55         STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF,
  56         STATE_AWAIT_IRQ_FINGER_REMOVED,
  57 };
  58
  59 static int state = 0;
  60 static struct libusb_device_handle *devh = NULL;
  61 static unsigned char imgbuf[0x1b340];
  62 static unsigned char irqbuf[INTR_LENGTH];
  63 static struct libusb_transfer *img_transfer = NULL;
  64 static struct libusb_transfer *irq_transfer = NULL;
  65 static int img_idx = 0;
  66 static int do_exit = 0;
  67
  68 static int find_dpfp_device(void)
  69 {
  70         devh = libusb_open_device_with_vid_pid(NULL, 0x05ba, 0x000a);
  71         return devh ? 0 : -EIO;
  72 }
  73
  74 static int print_f0_data(void)
  75 {
  76         unsigned char data[0x10];
  77         int r;
  78         unsigned int i;
  79
  80         r = libusb_control_transfer(devh, CTRL_IN, USB_RQ, 0xf0, 0, data,
  81                 sizeof(data), 0);
  82         if (r < 0) {
  83                 fprintf(stderr, "F0 error %d\n", r);
  84                 return r;
  85         }
  86         if ((unsigned int) r < sizeof(data)) {
  87                 fprintf(stderr, "short read (%d)\n", r);
  88                 return -1;
  89         }
  90
  91         printf("F0 data:");
  92         for (i = 0; i < sizeof(data); i++)
  93                 printf("%02x ", data[i]);
  94         printf("\n");
  95         return 0;
  96 }
  97
  98 static int get_hwstat(unsigned char *status)
  99 {
 100         int r;
 101
 102         r = libusb_control_transfer(devh, CTRL_IN, USB_RQ, 0x07, 0, status, 1, 0);
 103         if (r < 0) {
 104                 fprintf(stderr, "read hwstat error %d\n", r);
 105                 return r;
 106         }
 107         if ((unsigned int) r < 1) {
 108                 fprintf(stderr, "short read (%d)\n", r);
 109                 return -1;
 110         }
 111
 112         printf("hwstat reads %02x\n", *status);
 113         return 0;
 114 }
 115
 116 static int set_hwstat(unsigned char data)
 117 {
 118         int r;
 119
 120         printf("set hwstat to %02x\n", data);
 121         r = libusb_control_transfer(devh, CTRL_OUT, USB_RQ, 0x07, 0, &data, 1, 0);
 122         if (r < 0) {
 123                 fprintf(stderr, "set hwstat error %d\n", r);
 124                 return r;
 125         }
 126         if ((unsigned int) r < 1) {
 127                 fprintf(stderr, "short write (%d)", r);
 128                 return -1;
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int set_mode(unsigned char data)
 135 {
 136         int r;
 137         printf("set mode %02x\n", data);
 138
 139         r = libusb_control_transfer(devh, CTRL_OUT, USB_RQ, 0x4e, 0, &data, 1, 0);
 140         if (r < 0) {
 141                 fprintf(stderr, "set mode error %d\n", r);
 142                 return r;
 143         }
 144         if ((unsigned int) r < 1) {
 145                 fprintf(stderr, "short write (%d)", r);
 146                 return -1;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static void LIBUSB_CALL cb_mode_changed(struct libusb_transfer *transfer)
 153 {
 154         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 155                 fprintf(stderr, "mode change transfer not completed!\n");
 156                 do_exit = 2;
 157         }
 158
 159         printf("async cb_mode_changed length=%d actual_length=%d\n",
 160                 transfer->length, transfer->actual_length);
 161         if (next_state() < 0)
 162                 do_exit = 2;
 163 }
 164
 165 static int set_mode_async(unsigned char data)
 166 {
 167         unsigned char *buf = (unsigned char*) malloc(LIBUSB_CONTROL_SETUP_SIZE + 1);
 168         struct libusb_transfer *transfer;
 169
 170         if (!buf)
 171                 return -ENOMEM;
 172
 173         transfer = libusb_alloc_transfer(0);
 174         if (!transfer) {
 175                 free(buf);
 176                 return -ENOMEM;
 177         }
 178
 179         printf("async set mode %02x\n", data);
 180         libusb_fill_control_setup(buf, CTRL_OUT, USB_RQ, 0x4e, 0, 1);
 181         buf[LIBUSB_CONTROL_SETUP_SIZE] = data;
 182         libusb_fill_control_transfer(transfer, devh, buf, cb_mode_changed, NULL,
 183                 1000);
 184
 185         transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK
 186                 | LIBUSB_TRANSFER_FREE_BUFFER | LIBUSB_TRANSFER_FREE_TRANSFER;
 187         return libusb_submit_transfer(transfer);
 188 }
 189
 190 static int do_sync_intr(unsigned char *data)
 191 {
 192         int r;
 193         int transferred;
 194
 195         r = libusb_interrupt_transfer(devh, EP_INTR, data, INTR_LENGTH,
 196                 &transferred, 1000);
 197         if (r < 0) {
 198                 fprintf(stderr, "intr error %d\n", r);
 199                 return r;
 200         }
 201         if (transferred < INTR_LENGTH) {
 202                 fprintf(stderr, "short read (%d)\n", r);
 203                 return -1;
 204         }
 205
 206         printf("recv interrupt %04x\n", *((uint16_t *) data));
 207         return 0;
 208 }
 209
 210 static int sync_intr(unsigned char type)
 211 {
 212         int r;
 213         unsigned char data[INTR_LENGTH];
 214
 215         while (1) {
 216                 r = do_sync_intr(data);
 217                 if (r < 0)
 218                         return r;
 219                 if (data[0] == type)
 220                         return 0;
 221         }
 222 }
 223
 224 static int save_to_file(unsigned char *data)
 225 {
 226         FILE *fd;
 227         char filename[64];
 228
 229         snprintf(filename, sizeof(filename), "finger%d.pgm", img_idx++);
 230         fd = fopen(filename, "w");
 231         if (!fd)
 232                 return -1;
 233
 234         fputs("P5 384 289 255 ", fd);
 235         (void) fwrite(data + 64, 1, 384*289, fd);
 236         fclose(fd);
 237         printf("saved image to %s\n", filename);
 238         return 0;
 239 }
 240
 241 static int next_state(void)
 242 {
 243         int r = 0;
 244         printf("old state: %d\n", state);
 245         switch (state) {
 246         case STATE_AWAIT_IRQ_FINGER_REMOVED:
 247                 state = STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON;
 248                 r = set_mode_async(MODE_AWAIT_FINGER_ON);
 249                 break;
 250         case STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_ON:
 251                 state = STATE_AWAIT_IRQ_FINGER_DETECTED;
 252                 break;
 253         case STATE_AWAIT_IRQ_FINGER_DETECTED:
 254                 state = STATE_AWAIT_MODE_CHANGE_CAPTURE;
 255                 r = set_mode_async(MODE_CAPTURE);
 256                 break;
 257         case STATE_AWAIT_MODE_CHANGE_CAPTURE:
 258                 state = STATE_AWAIT_IMAGE;
 259                 break;
 260         case STATE_AWAIT_IMAGE:
 261                 state = STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF;
 262                 r = set_mode_async(MODE_AWAIT_FINGER_OFF);
 263                 break;
 264         case STATE_AWAIT_MODE_CHANGE_AWAIT_FINGER_OFF:
 265                 state = STATE_AWAIT_IRQ_FINGER_REMOVED;
 266                 break;
 267         default:
 268                 printf("unrecognised state %d\n", state);
 269         }
 270         if (r < 0) {
 271                 fprintf(stderr, "error detected changing state\n");
 272                 return r;
 273         }
 274
 275         printf("new state: %d\n", state);
 276         return 0;
 277 }
 278
 279 static void LIBUSB_CALL cb_irq(struct libusb_transfer *transfer)
 280 {
 281         unsigned char irqtype = transfer->buffer[0];
 282
 283         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 284                 fprintf(stderr, "irq transfer status %d?\n", transfer->status);
 285                 do_exit = 2;
 286                 libusb_free_transfer(transfer);
 287                 irq_transfer = NULL;
 288                 return;
 289         }
 290
 291         printf("IRQ callback %02x\n", irqtype);
 292         switch (state) {
 293         case STATE_AWAIT_IRQ_FINGER_DETECTED:
 294                 if (irqtype == 0x01) {
 295                         if (next_state() < 0) {
 296                                 do_exit = 2;
 297                                 return;
 298                         }
 299                 } else {
 300                         printf("finger-on-sensor detected in wrong state!\n");
 301                 }
 302                 break;
 303         case STATE_AWAIT_IRQ_FINGER_REMOVED:
 304                 if (irqtype == 0x02) {
 305                         if (next_state() < 0) {
 306                                 do_exit = 2;
 307                                 return;
 308                         }
 309                 } else {
 310                         printf("finger-on-sensor detected in wrong state!\n");
 311                 }
 312                 break;
 313         }
 314         if (libusb_submit_transfer(irq_transfer) < 0)
 315                 do_exit = 2;
 316 }
 317
 318 static void LIBUSB_CALL cb_img(struct libusb_transfer *transfer)
 319 {
 320         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 321                 fprintf(stderr, "img transfer status %d?\n", transfer->status);
 322                 do_exit = 2;
 323                 libusb_free_transfer(transfer);
 324                 img_transfer = NULL;
 325                 return;
 326         }
 327
 328         printf("Image callback\n");
 329         save_to_file(imgbuf);
 330         if (next_state() < 0) {
 331                 do_exit = 2;
 332                 return;
 333         }
 334         if (libusb_submit_transfer(img_transfer) < 0)
 335                 do_exit = 2;
 336 }
 337
 338 static int init_capture(void)
 339 {
 340         int r;
 341
 342         r = libusb_submit_transfer(irq_transfer);
 343         if (r < 0)
 344                 return r;
 345
 346         r = libusb_submit_transfer(img_transfer);
 347         if (r < 0) {
 348                 libusb_cancel_transfer(irq_transfer);
 349                 while (irq_transfer)
 350                         if (libusb_handle_events(NULL) < 0)
 351                                 break;
 352                 return r;
 353         }
 354
 355         /* start state machine */
 356         state = STATE_AWAIT_IRQ_FINGER_REMOVED;
 357         return next_state();
 358 }
 359
 360 static int do_init(void)
 361 {
 362         unsigned char status;
 363         int r;
 364
 365         r = get_hwstat(&status);
 366         if (r < 0)
 367                 return r;
 368
 369         if (!(status & 0x80)) {
 370                 r = set_hwstat(status | 0x80);
 371                 if (r < 0)
 372                         return r;
 373                 r = get_hwstat(&status);
 374                 if (r < 0)
 375                         return r;
 376         }
 377
 378         status &= ~0x80;
 379         r = set_hwstat(status);
 380         if (r < 0)
 381                 return r;
 382
 383         r = get_hwstat(&status);
 384         if (r < 0)
 385                 return r;
 386
 387         r = sync_intr(0x56);
 388         if (r < 0)
 389                 return r;
 390
 391         return 0;
 392 }
 393
 394 static int alloc_transfers(void)
 395 {
 396         img_transfer = libusb_alloc_transfer(0);
 397         if (!img_transfer)
 398                 return -ENOMEM;
 399
 400         irq_transfer = libusb_alloc_transfer(0);
 401         if (!irq_transfer)
 402                 return -ENOMEM;
 403
 404         libusb_fill_bulk_transfer(img_transfer, devh, EP_DATA, imgbuf,
 405                 sizeof(imgbuf), cb_img, NULL, 0);
 406         libusb_fill_interrupt_transfer(irq_transfer, devh, EP_INTR, irqbuf,
 407                 sizeof(irqbuf), cb_irq, NULL, 0);
 408
 409         return 0;
 410 }
 411
 412 static void sighandler(int signum)
 413 {
 414         do_exit = 1;
 415 }
 416
 417 int main(void)
 418 {
 419         struct sigaction sigact;
 420         int r = 1;
 421
 422         r = libusb_init(NULL);
 423         if (r < 0) {
 424                 fprintf(stderr, "failed to initialise libusb\n");
 425                 exit(1);
 426         }
 427
 428         r = find_dpfp_device();
 429         if (r < 0) {
 430                 fprintf(stderr, "Could not find/open device\n");
 431                 goto out;
 432         }
 433
 434         r = libusb_claim_interface(devh, 0);
 435         if (r < 0) {
 436                 fprintf(stderr, "usb_claim_interface error %d\n", r);
 437                 goto out;
 438         }
 439         printf("claimed interface\n");
 440
 441         r = print_f0_data();
 442         if (r < 0)
 443                 goto out_release;
 444
 445         r = do_init();
 446         if (r < 0)
 447                 goto out_deinit;
 448
 449         /* async from here onwards */
 450
 451         r = alloc_transfers();
 452         if (r < 0)
 453                 goto out_deinit;
 454
 455         r = init_capture();
 456         if (r < 0)
 457                 goto out_deinit;
 458
 459         sigact.sa_handler = sighandler;
 460         sigemptyset(&sigact.sa_mask);
 461         sigact.sa_flags = 0;
 462         sigaction(SIGINT, &sigact, NULL);
 463         sigaction(SIGTERM, &sigact, NULL);
 464         sigaction(SIGQUIT, &sigact, NULL);
 465
 466         while (!do_exit) {
 467                 r = libusb_handle_events(NULL);
 468                 if (r < 0)
 469                         goto out_deinit;
 470         }
 471
 472         printf("shutting down...\n");
 473
 474         if (irq_transfer) {
 475                 r = libusb_cancel_transfer(irq_transfer);
 476                 if (r < 0)
 477                         goto out_deinit;
 478         }
 479
 480         if (img_transfer) {
 481                 r = libusb_cancel_transfer(img_transfer);
 482                 if (r < 0)
 483                         goto out_deinit;
 484         }
 485
 486         while (irq_transfer || img_transfer)
 487                 if (libusb_handle_events(NULL) < 0)
 488                         break;
 489
 490         if (do_exit == 1)
 491                 r = 0;
 492         else
 493                 r = 1;
 494
 495 out_deinit:
 496         libusb_free_transfer(img_transfer);
 497         libusb_free_transfer(irq_transfer);
 498         set_mode(0);
 499         set_hwstat(0x80);
 500 out_release:
 501         libusb_release_interface(devh, 0);
 502 out:
 503         libusb_close(devh);
 504         libusb_exit(NULL);
 505         return r >= 0 ? r : -r;
 506 }