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 = 1;
  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, "< ");
 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                 free(data_buf);
 195                 return NULL;
 196         }
 197
 198         return transfer;
 199 }
 200
 201 struct hmcfgusb_cb_data {
 202         struct hmcfgusb_dev *dev;
 203         hmcfgusb_cb_fn cb;
 204         void *data;
 205 };
 206
 207 static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 208 {
 209         int err;
 210         struct hmcfgusb_cb_data *cb_data;
 211
 212         cb_data = transfer->user_data;
 213
 214         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 215                 if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
 216                         fprintf(stderr, "Interrupt transfer not completed: %d!\n", transfer->status);
 217                         quit = EIO;
 218
 219                         if (cb_data && cb_data->dev && cb_data->dev->transfer) {
 220                                 libusb_free_transfer(cb_data->dev->transfer);
 221                                 cb_data->dev->transfer = NULL;
 222                         }
 223                         return;
 224                 }
 225         } else {
 226                 if (cb_data && cb_data->cb) {
 227                         if (debug)
 228                                 hexdump(transfer->buffer, transfer->actual_length, "> ");
 229                         cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data);
 230                 } else {
 231                         hexdump(transfer->buffer, transfer->actual_length, "> ");
 232                 }
 233         }
 234
 235         err = libusb_submit_transfer(transfer);
 236         if (err != 0) {
 237                 fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
 238                 free(transfer->buffer);
 239                 libusb_free_transfer(transfer);
 240         }
 241 }
 242
 243 struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
 244 {
 245         libusb_device_handle *devh = NULL;
 246         const struct libusb_pollfd **usb_pfd = NULL;
 247         struct hmcfgusb_dev *dev = NULL;
 248         struct hmcfgusb_cb_data *cb_data = NULL;
 249         int err;
 250         int i;
 251
 252         err = libusb_init(NULL);
 253         if (err != 0) {
 254                 fprintf(stderr, "Can't initialize libusb: %s\n", usb_strerror(err));
 255                 return NULL;
 256         }
 257
 258         devh = hmcfgusb_find();
 259         if (!devh) {
 260                 fprintf(stderr, "Can't find/open hmcfgusb!\n");
 261                 return NULL;
 262         }
 263
 264         dev = malloc(sizeof(struct hmcfgusb_dev));
 265         if (!dev) {
 266                 perror("Can't allocate memory for hmcfgusb_dev");
 267                 return NULL;
 268         }
 269
 270         memset(dev, 0, sizeof(struct hmcfgusb_dev));
 271         dev->usb_devh = devh;
 272
 273         cb_data = malloc(sizeof(struct hmcfgusb_cb_data));
 274         if (!cb_data) {
 275                 perror("Can't allocate memory for hmcfgusb_cb_data");
 276                 return NULL;
 277         }
 278
 279         memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
 280
 281         cb_data->dev = dev;
 282         cb_data->cb = cb;
 283         cb_data->data = data;
 284
 285         dev->transfer = hmcfgusb_prepare_int(devh, hmcfgusb_interrupt, cb_data);
 286         if (!dev->transfer) {
 287                 fprintf(stderr, "Can't prepare async device io!\n");
 288                 return NULL;
 289         }
 290
 291         usb_pfd = libusb_get_pollfds(NULL);
 292         if (!usb_pfd) {
 293                 fprintf(stderr, "Can't get FDset from libusb!\n");
 294                 free(dev);
 295                 return NULL;
 296         }
 297
 298         dev->n_usb_pfd = 0;
 299         for(i = 0; usb_pfd[i]; i++)
 300                 dev->n_usb_pfd++;
 301
 302         dev->pfd = malloc(dev->n_usb_pfd * sizeof(struct pollfd));
 303         if (!dev->pfd) {
 304                 perror("Can't allocate memory for poll-fds");
 305                 return NULL;
 306         }
 307
 308         memset(dev->pfd, 0, dev->n_usb_pfd * sizeof(struct pollfd));
 309
 310         for (i = 0; i < dev->n_usb_pfd; i++) {
 311                 dev->pfd[i].fd = usb_pfd[i]->fd;
 312                 dev->pfd[i].events = usb_pfd[i]->events;
 313                 dev->pfd[i].revents = 0;
 314         }
 315
 316         free(usb_pfd);
 317
 318         dev->n_pfd = dev->n_usb_pfd;
 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                         return -1;
 374                 } else if (n == 0) {
 375                         usb_event = 1;
 376                 } else {
 377                         for (fd_n = 0; fd_n < dev->n_pfd; fd_n++) {
 378                                 if (dev->pfd[fd_n].revents) {
 379                                         if (fd_n < dev->n_usb_pfd) {
 380                                                 usb_event = 1;
 381                                                 break;
 382                                         } else {
 383                                                 return dev->pfd[fd_n].fd;
 384                                         }
 385                                 }
 386                         }
 387                 }
 388         }
 389
 390         if (usb_event) {
 391                 memset(&tv, 0, sizeof(tv));
 392                 err = libusb_handle_events_timeout_completed(NULL, &tv, NULL);
 393                 if (err < 0) {
 394                         fprintf(stderr, "libusb_handle_events_timeout_completed: %s\n", usb_strerror(err));
 395                         errno = EIO;
 396                         return -1;
 397                 }
 398         }
 399
 400         if (quit)
 401                 errno = quit;
 402
 403         return -1;
 404 }
 405
 406 void hmcfgusb_close(struct hmcfgusb_dev *dev)
 407 {
 408         int err;
 409
 410         if (dev->transfer) {
 411                 libusb_cancel_transfer(dev->transfer);
 412         }
 413
 414         err = libusb_release_interface(dev->usb_devh, INTERFACE);
 415         if ((err != 0)) {
 416                 fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
 417         }
 418
 419         libusb_close(dev->usb_devh);
 420         free(dev->pfd);
 421         free(dev);
 422
 423         libusb_exit(NULL);
 424 }