git.zerfleddert.de Git - hmcfgusb/blob - hmcfgusb.c

   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 <sys/time.h>
  33 #include <libusb-1.0/libusb.h>
  34
  35 #include "hexdump.h"
  36 #include "hmcfgusb.h"
  37
  38 #define USB_TIMEOUT     10000
  39
  40 #define ID_VENDOR       0x1b1f
  41 #define ID_PRODUCT      0xc00f
  42 #define ID_PRODUCT_BL   0xc010
  43
  44 /* TODO: dynamic */
  45 #define ASYNC_SIZE      0x0040
  46 #define ASYNC_INTERVAL  32
  47
  48 #define EP_OUT          0x02
  49 #define EP_IN           0x83
  50
  51 #define INTERFACE       0
  52
  53 static int quit = 0;
  54 static int debug = 0;
  55
  56 /* Not in all libusb-1.0 versions, so we have to roll our own :-( */
  57 static char * usb_strerror(int e)
  58 {
  59         static char unknerr[256];
  60
  61         switch (e) {
  62                 case LIBUSB_SUCCESS:
  63                         return "Success";
  64                 case LIBUSB_ERROR_IO:
  65                         return "Input/output error";
  66                 case LIBUSB_ERROR_INVALID_PARAM:
  67                         return "Invalid parameter";
  68                 case LIBUSB_ERROR_ACCESS:
  69                         return "Access denied (insufficient permissions)";
  70                 case LIBUSB_ERROR_NO_DEVICE:
  71                         return "No such device (it may have been disconnected)";
  72                 case LIBUSB_ERROR_NOT_FOUND:
  73                         return "Entity not found";
  74                 case LIBUSB_ERROR_BUSY:
  75                         return "Resource busy";
  76                 case LIBUSB_ERROR_TIMEOUT:
  77                         return "Operation timed out";
  78                 case LIBUSB_ERROR_OVERFLOW:
  79                         return "Overflow";
  80                 case LIBUSB_ERROR_PIPE:
  81                         return "Pipe error";
  82                 case LIBUSB_ERROR_INTERRUPTED:
  83                         return "System call interrupted (perhaps due to signal)";
  84                 case LIBUSB_ERROR_NO_MEM:
  85                         return "Insufficient memory";
  86                 case LIBUSB_ERROR_NOT_SUPPORTED:
  87                         return "Operation not supported or unimplemented on this platform";
  88                 case LIBUSB_ERROR_OTHER:
  89                         return "Other error";
  90         };
  91         snprintf(unknerr, sizeof(unknerr), "Unknown error code %d / 0x%02x", e, e);
  92         return unknerr;
  93 }
  94
  95 static libusb_device_handle *hmcfgusb_find() {
  96         libusb_device_handle *devh = NULL;
  97         libusb_device **list;
  98         ssize_t cnt;
  99         ssize_t i;
 100         int err;
 101
 102         cnt = libusb_get_device_list(NULL, &list);
 103         if (cnt < 0) {
 104                 fprintf(stderr, "Can't get USB device list: %d\n", (int)cnt);
 105                 return NULL;
 106         }
 107
 108         for (i = 0; i < cnt; i++){
 109                 struct libusb_device_descriptor desc;
 110
 111                 err = libusb_get_device_descriptor(list[i], &desc);
 112                 if (err)
 113                         continue;
 114
 115                 if ((desc.idVendor == ID_VENDOR) &&
 116                     ((desc.idProduct == ID_PRODUCT) || (desc.idProduct == ID_PRODUCT_BL))) {
 117                         libusb_device *dev = list[i];
 118
 119                         err = libusb_open(dev, &devh);
 120                         if (err) {
 121                                 fprintf(stderr, "Can't open device: %s\n", usb_strerror(err));
 122                                 return NULL;
 123                         }
 124
 125                         err = libusb_detach_kernel_driver(devh, INTERFACE);
 126                         if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
 127                                 fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
 128                                 return NULL;
 129                         }
 130
 131                         err = libusb_claim_interface(devh, INTERFACE);
 132                         if ((err != 0)) {
 133                                 fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
 134                                 return NULL;
 135                         }
 136
 137                         return devh;
 138                 }
 139
 140         }
 141
 142         return NULL;
 143 }
 144
 145 int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent)
 146 {
 147         int err;
 148         int cnt;
 149         unsigned char out[0x40];
 150
 151         memset(out, 0, sizeof(out));
 152
 153         err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, out, 0, &cnt, USB_TIMEOUT);
 154         if (err && (!silent)) {
 155                 fprintf(stderr, "Can't send null frame: %s\n", usb_strerror(err));
 156                 return 0;
 157         }
 158
 159         return 1;
 160 }
 161
 162 int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done)
 163 {
 164         int err;
 165         int cnt;
 166         struct timeval tv_start, tv_end;
 167         int msec;
 168
 169         if (debug) {
 170                 hexdump(send_data, len, "USB < ");
 171         }
 172
 173         gettimeofday(&tv_start, NULL);
 174
 175         err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
 176         if (err) {
 177                 fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
 178                 return 0;
 179         }
 180
 181         if (done) {
 182                 if (!hmcfgusb_send_null_frame(usbdev, 0)) {
 183                         return 0;
 184                 }
 185         }
 186
 187         gettimeofday(&tv_end, NULL);
 188         msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
 189
 190         if (msec > 100) {
 191                 fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
 192         } else if (debug) {
 193                 fprintf(stderr, "usb-transfer took %dms!\n", msec);
 194         }
 195
 196         return 1;
 197 }
 198
 199 static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data)
 200 {
 201         unsigned char *data_buf;
 202         struct libusb_transfer *transfer;
 203         int err;
 204
 205         data_buf = malloc(ASYNC_SIZE);
 206         if (!data_buf) {
 207                 fprintf(stderr, "Can't allocate memory for data-buffer!\n");
 208                 return NULL;
 209         }
 210
 211         transfer = libusb_alloc_transfer(0);
 212         if (!transfer) {
 213                 fprintf(stderr, "Can't allocate memory for usb-transfer!\n");
 214                 free(data_buf);
 215                 return NULL;
 216         }
 217
 218         libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
 219                         data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
 220
 221         transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK | LIBUSB_TRANSFER_FREE_BUFFER;
 222
 223         err = libusb_submit_transfer(transfer);
 224         if (err != 0) {
 225                 fprintf(stderr, "Can't submit transfer: %s\n", usb_strerror(err));
 226                 libusb_free_transfer(transfer);
 227                 return NULL;
 228         }
 229
 230         return transfer;
 231 }
 232
 233 struct hmcfgusb_cb_data {
 234         struct hmcfgusb_dev *dev;
 235         hmcfgusb_cb_fn cb;
 236         void *data;
 237 };
 238
 239 static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 240 {
 241         int err;
 242         struct hmcfgusb_cb_data *cb_data;
 243
 244         cb_data = transfer->user_data;
 245
 246         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 247                 if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
 248                         fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
 249                         quit = EIO;
 250
 251                         if (cb_data && cb_data->dev && cb_data->dev->transfer) {
 252                                 libusb_free_transfer(cb_data->dev->transfer);
 253                                 cb_data->dev->transfer = NULL;
 254                                 free(cb_data);
 255                         }
 256                         return;
 257                 }
 258         } else {
 259                 if (cb_data && cb_data->cb) {
 260                         if (debug)
 261                                 hexdump(transfer->buffer, transfer->actual_length, "USB > ");
 262
 263                         if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
 264                                 quit = EIO;
 265
 266                                 if (cb_data && cb_data->dev && cb_data->dev->transfer) {
 267                                         libusb_free_transfer(cb_data->dev->transfer);
 268                                         cb_data->dev->transfer = NULL;
 269                                         free(cb_data);
 270                                 }
 271
 272                                 return;
 273                         }
 274                 } else {
 275                         hexdump(transfer->buffer, transfer->actual_length, "> ");
 276                 }
 277         }
 278
 279         err = libusb_submit_transfer(transfer);
 280         if (err != 0) {
 281                 fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
 282                 libusb_free_transfer(transfer);
 283                 cb_data->dev->transfer = NULL;
 284                 free(cb_data);
 285         }
 286 }
 287
 288 struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
 289 {
 290         libusb_device_handle *devh = NULL;
 291         const struct libusb_pollfd **usb_pfd = NULL;
 292         struct hmcfgusb_dev *dev = NULL;
 293         struct hmcfgusb_cb_data *cb_data = NULL;
 294         int err;
 295         int i;
 296
 297         err = libusb_init(NULL);
 298         if (err != 0) {
 299                 fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
 300                 return NULL;
 301         }
 302
 303         devh = hmcfgusb_find();
 304         if (!devh) {
 305                 fprintf(stderr, "Can't find/open hmcfgusb!\n");
 306                 return NULL;
 307         }
 308
 309         dev = malloc(sizeof(struct hmcfgusb_dev));
 310         if (!dev) {
 311                 perror("Can't allocate memory for hmcfgusb_dev");
 312                 return NULL;
 313         }
 314
 315         memset(dev, 0, sizeof(struct hmcfgusb_dev));
 316         dev->usb_devh = devh;
 317
 318         cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
 319         if (!cb_data) {
 320                 perror("Can't allocate memory for hmcfgusb_cb_data");
 321                 free(dev);
 322                 return NULL;
 323         }
 324
 325         memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
 326
 327         cb_data->dev = dev;
 328         cb_data->cb = cb;
 329         cb_data->data = data;
 330
 331         dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
 332         if (!dev->transfer) {
 333                 fprintf(stderr, "Can't prepare async device io!\n");
 334                 free(dev);
 335                 free(cb_data);
 336                 return NULL;
 337         }
 338
 339         usb_pfd = libusb_get_pollfds(NULL);
 340         if (!usb_pfd) {
 341                 fprintf(stderr, "Can't get FDset from libusb!\n");
 342                 free(dev);
 343                 free(cb_data);
 344                 return NULL;
 345         }
 346
 347         dev->n_usb_pfd = 0;
 348         for(i = 0; usb_pfd[i]; i++)
 349                 dev->n_usb_pfd++;
 350
 351         dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
 352         if (!dev->pfd) {
 353                 perror("Can't allocate memory for poll-fds");
 354                 free(dev);
 355                 free(cb_data);
 356                 return NULL;
 357         }
 358
 359         memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
 360
 361         for (i = 0; i < dev->n_usb_pfd; i++) {
 362                 dev->pfd[i].fd = usb_pfd[i]->fd;
 363                 dev->pfd[i].events = usb_pfd[i]->events;
 364                 dev->pfd[i].revents = 0;
 365         }
 366
 367         free(usb_pfd);
 368
 369         dev->n_pfd = dev->n_usb_pfd;
 370
 371         quit = 0;
 372
 373         return dev;
 374 }
 375
 376 int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events)
 377 {
 378         dev->n_pfd++;
 379         dev->pfd = realloc(dev->pfd, dev->n_pfd * sizeof(struct pollfd));
 380         if (!dev->pfd) {
 381                 perror("Can't realloc poll-fds");
 382                 return 0;
 383         }
 384
 385         dev->pfd[dev->n_pfd-1].fd = fd;
 386         dev->pfd[dev->n_pfd-1].events = events;
 387         dev->pfd[dev->n_pfd-1].revents = 0;
 388
 389         return 1;
 390 }
 391
 392 int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
 393 {
 394         struct timeval tv;
 395         int usb_event = 0;
 396         int timed_out = 0;
 397         int i;
 398         int n;
 399         int fd_n;
 400         int err;
 401
 402         errno = 0;
 403
 404         memset(&tv, 0, sizeof(tv));
 405         err = libusb_get_next_timeout(NULL, &tv);
 406         if (err < 0) {
 407                 fprintf(stderr, "libusb_get_next_timeout: %s\n", usb_strerror(err));
 408                 errno = EIO;
 409                 return -1;
 410         } else if (err == 0) {
 411                 /* No pending timeout or a sane platform */
 412                 tv.tv_sec = timeout;
 413         } else {
 414                 if ((tv.tv_sec == 0) && (tv.tv_usec == 0)) {
 415                         usb_event = 1;
 416                 } else if (tv.tv_sec > timeout) {
 417                         tv.tv_sec = timeout;
 418                         tv.tv_usec = 0;
 419                 }
 420         }
 421
 422         if (!usb_event) {
 423                 for (i = 0; i < dev->n_pfd; i++) {
 424                         dev->pfd[i].revents = 0;
 425                 }
 426
 427                 n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
 428                 if (n < 0) {
 429                         perror("poll");
 430                         errno = 0;
 431                         return -1;
 432                 } else if (n == 0) {
 433                         usb_event = 1;
 434                         timed_out = 1;
 435                 } else {
 436                         for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
 437                                 if (dev->pfd[fd_n].revents) {
 438                                         if (fd_n < dev->n_usb_pfd) {
 439                                                 usb_event = 1;
 440                                                 break;
 441                                         } else {
 442                                                 errno = 0;
 443                                                 return dev->pfd[fd_n].fd;
 444                                         }
 445                                 }
 446                         }
 447                 }
 448         }
 449
 450         if (usb_event) {
 451                 memset(&tv, 0, sizeof(tv));
 452                 err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
 453                 if (err < 0) {
 454                         fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
 455                         errno = EIO;
 456                         return -1;
 457                 }
 458         }
 459
 460         errno = 0;
 461         if (quit) {
 462                 fprintf(stderr, "closing device-connection due to error %d\n", quit);
 463                 errno = quit;
 464         }
 465
 466         if (timed_out)
 467                 errno = ETIMEDOUT;
 468
 469         return -1;
 470 }
 471
 472 void hmcfgusb_close(struct hmcfgusb_dev *dev)
 473 {
 474         int err;
 475
 476         if (dev->transfer) {
 477                 libusb_cancel_transfer(dev->transfer);
 478         }
 479
 480         err = libusb_release_interface(dev->usb_devh, INTERFACE);
 481         if ((err != 0)) {
 482                 fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
 483         }
 484
 485         libusb_close(dev->usb_devh);
 486         free(dev->pfd);
 487         free(dev);
 488
 489         libusb_exit(NULL);
 490 }
 491
 492 void hmcfgusb_set_debug(int d)
 493 {
 494         debug = d;
 495 }