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