tools/usb/ffs-test.c

   1 /*
   2  * ffs-test.c.c -- user mode filesystem api for usb composite function
   3  *
   4  * Copyright (C) 2010 Samsung Electronics
   5  *                    Author: Michal Nazarewicz <mina86@mina86.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
  23
  24
  25 #define _BSD_SOURCE /* for endian.h */
  26
  27 #include <endian.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <pthread.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/stat.h>
  37 #include <sys/types.h>
  38 #include <unistd.h>
  39 #include <tools/le_byteshift.h>
  40
  41 #include "../../include/linux/usb/functionfs.h"
  42
  43
  44 /******************** Little Endian Handling ********************************/
  45
  46 #define cpu_to_le16(x)  htole16(x)
  47 #define cpu_to_le32(x)  htole32(x)
  48 #define le32_to_cpu(x)  le32toh(x)
  49 #define le16_to_cpu(x)  le16toh(x)
  50
  51
  52 /******************** Messages and Errors ***********************************/
  53
  54 static const char argv0[] = "ffs-test";
  55
  56 static unsigned verbosity = 7;
  57
  58 static void _msg(unsigned level, const char *fmt, ...)
  59 {
  60         if (level < 2)
  61                 level = 2;
  62         else if (level > 7)
  63                 level = 7;
  64
  65         if (level <= verbosity) {
  66                 static const char levels[8][6] = {
  67                         [2] = "crit:",
  68                         [3] = "err: ",
  69                         [4] = "warn:",
  70                         [5] = "note:",
  71                         [6] = "info:",
  72                         [7] = "dbg: "
  73                 };
  74
  75                 int _errno = errno;
  76                 va_list ap;
  77
  78                 fprintf(stderr, "%s: %s ", argv0, levels[level]);
  79                 va_start(ap, fmt);
  80                 vfprintf(stderr, fmt, ap);
  81                 va_end(ap);
  82
  83                 if (fmt[strlen(fmt) - 1] != '\n') {
  84                         char buffer[128];
  85                         strerror_r(_errno, buffer, sizeof buffer);
  86                         fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
  87                 }
  88
  89                 fflush(stderr);
  90         }
  91 }
  92
  93 #define die(...)  (_msg(2, __VA_ARGS__), exit(1))
  94 #define err(...)   _msg(3, __VA_ARGS__)
  95 #define warn(...)  _msg(4, __VA_ARGS__)
  96 #define note(...)  _msg(5, __VA_ARGS__)
  97 #define info(...)  _msg(6, __VA_ARGS__)
  98 #define debug(...) _msg(7, __VA_ARGS__)
  99
 100 #define die_on(cond, ...) do { \
 101         if (cond) \
 102                 die(__VA_ARGS__); \
 103         } while (0)
 104
 105
 106 /******************** Descriptors and Strings *******************************/
 107
 108 static const struct {
 109         struct usb_functionfs_descs_head header;
 110         struct {
 111                 struct usb_interface_descriptor intf;
 112                 struct usb_endpoint_descriptor_no_audio sink;
 113                 struct usb_endpoint_descriptor_no_audio source;
 114         } __attribute__((packed)) fs_descs, hs_descs;
 115 } __attribute__((packed)) descriptors = {
 116         .header = {
 117                 .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC),
 118                 .length = cpu_to_le32(sizeof descriptors),
 119                 .fs_count = 3,
 120                 .hs_count = 3,
 121         },
 122         .fs_descs = {
 123                 .intf = {
 124                         .bLength = sizeof descriptors.fs_descs.intf,
 125                         .bDescriptorType = USB_DT_INTERFACE,
 126                         .bNumEndpoints = 2,
 127                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 128                         .iInterface = 1,
 129                 },
 130                 .sink = {
 131                         .bLength = sizeof descriptors.fs_descs.sink,
 132                         .bDescriptorType = USB_DT_ENDPOINT,
 133                         .bEndpointAddress = 1 | USB_DIR_IN,
 134                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 135                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 136                 },
 137                 .source = {
 138                         .bLength = sizeof descriptors.fs_descs.source,
 139                         .bDescriptorType = USB_DT_ENDPOINT,
 140                         .bEndpointAddress = 2 | USB_DIR_OUT,
 141                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 142                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 143                 },
 144         },
 145         .hs_descs = {
 146                 .intf = {
 147                         .bLength = sizeof descriptors.fs_descs.intf,
 148                         .bDescriptorType = USB_DT_INTERFACE,
 149                         .bNumEndpoints = 2,
 150                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 151                         .iInterface = 1,
 152                 },
 153                 .sink = {
 154                         .bLength = sizeof descriptors.hs_descs.sink,
 155                         .bDescriptorType = USB_DT_ENDPOINT,
 156                         .bEndpointAddress = 1 | USB_DIR_IN,
 157                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 158                         .wMaxPacketSize = cpu_to_le16(512),
 159                 },
 160                 .source = {
 161                         .bLength = sizeof descriptors.hs_descs.source,
 162                         .bDescriptorType = USB_DT_ENDPOINT,
 163                         .bEndpointAddress = 2 | USB_DIR_OUT,
 164                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 165                         .wMaxPacketSize = cpu_to_le16(512),
 166                         .bInterval = 1, /* NAK every 1 uframe */
 167                 },
 168         },
 169 };
 170
 171
 172 #define STR_INTERFACE_ "Source/Sink"
 173
 174 static const struct {
 175         struct usb_functionfs_strings_head header;
 176         struct {
 177                 __le16 code;
 178                 const char str1[sizeof STR_INTERFACE_];
 179         } __attribute__((packed)) lang0;
 180 } __attribute__((packed)) strings = {
 181         .header = {
 182                 .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
 183                 .length = cpu_to_le32(sizeof strings),
 184                 .str_count = cpu_to_le32(1),
 185                 .lang_count = cpu_to_le32(1),
 186         },
 187         .lang0 = {
 188                 cpu_to_le16(0x0409), /* en-us */
 189                 STR_INTERFACE_,
 190         },
 191 };
 192
 193 #define STR_INTERFACE strings.lang0.str1
 194
 195
 196 /******************** Files and Threads Handling ****************************/
 197
 198 struct thread;
 199
 200 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
 201 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
 202 static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
 203 static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
 204 static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
 205
 206
 207 static struct thread {
 208         const char *const filename;
 209         size_t buf_size;
 210
 211         ssize_t (*in)(struct thread *, void *, size_t);
 212         const char *const in_name;
 213
 214         ssize_t (*out)(struct thread *, const void *, size_t);
 215         const char *const out_name;
 216
 217         int fd;
 218         pthread_t id;
 219         void *buf;
 220         ssize_t status;
 221 } threads[] = {
 222         {
 223                 "ep0", 4 * sizeof(struct usb_functionfs_event),
 224                 read_wrap, NULL,
 225                 ep0_consume, "<consume>",
 226                 0, 0, NULL, 0
 227         },
 228         {
 229                 "ep1", 8 * 1024,
 230                 fill_in_buf, "<in>",
 231                 write_wrap, NULL,
 232                 0, 0, NULL, 0
 233         },
 234         {
 235                 "ep2", 8 * 1024,
 236                 read_wrap, NULL,
 237                 empty_out_buf, "<out>",
 238                 0, 0, NULL, 0
 239         },
 240 };
 241
 242
 243 static void init_thread(struct thread *t)
 244 {
 245         t->buf = malloc(t->buf_size);
 246         die_on(!t->buf, "malloc");
 247
 248         t->fd = open(t->filename, O_RDWR);
 249         die_on(t->fd < 0, "%s", t->filename);
 250 }
 251
 252 static void cleanup_thread(void *arg)
 253 {
 254         struct thread *t = arg;
 255         int ret, fd;
 256
 257         fd = t->fd;
 258         if (t->fd < 0)
 259                 return;
 260         t->fd = -1;
 261
 262         /* test the FIFO ioctls (non-ep0 code paths) */
 263         if (t != threads) {
 264                 ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
 265                 if (ret < 0) {
 266                         /* ENODEV reported after disconnect */
 267                         if (errno != ENODEV)
 268                                 err("%s: get fifo status", t->filename);
 269                 } else if (ret) {
 270                         warn("%s: unclaimed = %d\n", t->filename, ret);
 271                         if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
 272                                 err("%s: fifo flush", t->filename);
 273                 }
 274         }
 275
 276         if (close(fd) < 0)
 277                 err("%s: close", t->filename);
 278
 279         free(t->buf);
 280         t->buf = NULL;
 281 }
 282
 283 static void *start_thread_helper(void *arg)
 284 {
 285         const char *name, *op, *in_name, *out_name;
 286         struct thread *t = arg;
 287         ssize_t ret;
 288
 289         info("%s: starts\n", t->filename);
 290         in_name = t->in_name ? t->in_name : t->filename;
 291         out_name = t->out_name ? t->out_name : t->filename;
 292
 293         pthread_cleanup_push(cleanup_thread, arg);
 294
 295         for (;;) {
 296                 pthread_testcancel();
 297
 298                 ret = t->in(t, t->buf, t->buf_size);
 299                 if (ret > 0) {
 300                         ret = t->out(t, t->buf, t->buf_size);
 301                         name = out_name;
 302                         op = "write";
 303                 } else {
 304                         name = in_name;
 305                         op = "read";
 306                 }
 307
 308                 if (ret > 0) {
 309                         /* nop */
 310                 } else if (!ret) {
 311                         debug("%s: %s: EOF", name, op);
 312                         break;
 313                 } else if (errno == EINTR || errno == EAGAIN) {
 314                         debug("%s: %s", name, op);
 315                 } else {
 316                         warn("%s: %s", name, op);
 317                         break;
 318                 }
 319         }
 320
 321         pthread_cleanup_pop(1);
 322
 323         t->status = ret;
 324         info("%s: ends\n", t->filename);
 325         return NULL;
 326 }
 327
 328 static void start_thread(struct thread *t)
 329 {
 330         debug("%s: starting\n", t->filename);
 331
 332         die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
 333                "pthread_create(%s)", t->filename);
 334 }
 335
 336 static void join_thread(struct thread *t)
 337 {
 338         int ret = pthread_join(t->id, NULL);
 339
 340         if (ret < 0)
 341                 err("%s: joining thread", t->filename);
 342         else
 343                 debug("%s: joined\n", t->filename);
 344 }
 345
 346
 347 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
 348 {
 349         return read(t->fd, buf, nbytes);
 350 }
 351
 352 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
 353 {
 354         return write(t->fd, buf, nbytes);
 355 }
 356
 357
 358 /******************** Empty/Fill buffer routines ****************************/
 359
 360 /* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
 361 enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
 362 static enum pattern pattern;
 363
 364 static ssize_t
 365 fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
 366 {
 367         size_t i;
 368         __u8 *p;
 369
 370         (void)ignore;
 371
 372         switch (pattern) {
 373         case PAT_ZERO:
 374                 memset(buf, 0, nbytes);
 375                 break;
 376
 377         case PAT_SEQ:
 378                 for (p = buf, i = 0; i < nbytes; ++i, ++p)
 379                         *p = i % 63;
 380                 break;
 381
 382         case PAT_PIPE:
 383                 return fread(buf, 1, nbytes, stdin);
 384         }
 385
 386         return nbytes;
 387 }
 388
 389 static ssize_t
 390 empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
 391 {
 392         const __u8 *p;
 393         __u8 expected;
 394         ssize_t ret;
 395         size_t len;
 396
 397         (void)ignore;
 398
 399         switch (pattern) {
 400         case PAT_ZERO:
 401                 expected = 0;
 402                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 403                         if (*p)
 404                                 goto invalid;
 405                 break;
 406
 407         case PAT_SEQ:
 408                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 409                         if (*p != len % 63) {
 410                                 expected = len % 63;
 411                                 goto invalid;
 412                         }
 413                 break;
 414
 415         case PAT_PIPE:
 416                 ret = fwrite(buf, nbytes, 1, stdout);
 417                 if (ret > 0)
 418                         fflush(stdout);
 419                 break;
 420
 421 invalid:
 422                 err("bad OUT byte %zd, expected %02x got %02x\n",
 423                     len, expected, *p);
 424                 for (p = buf, len = 0; len < nbytes; ++p, ++len) {
 425                         if (0 == (len % 32))
 426                                 fprintf(stderr, "%4zd:", len);
 427                         fprintf(stderr, " %02x", *p);
 428                         if (31 == (len % 32))
 429                                 fprintf(stderr, "\n");
 430                 }
 431                 fflush(stderr);
 432                 errno = EILSEQ;
 433                 return -1;
 434         }
 435
 436         return len;
 437 }
 438
 439
 440 /******************** Endpoints routines ************************************/
 441
 442 static void handle_setup(const struct usb_ctrlrequest *setup)
 443 {
 444         printf("bRequestType = %d\n", setup->bRequestType);
 445         printf("bRequest     = %d\n", setup->bRequest);
 446         printf("wValue       = %d\n", le16_to_cpu(setup->wValue));
 447         printf("wIndex       = %d\n", le16_to_cpu(setup->wIndex));
 448         printf("wLength      = %d\n", le16_to_cpu(setup->wLength));
 449 }
 450
 451 static ssize_t
 452 ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
 453 {
 454         static const char *const names[] = {
 455                 [FUNCTIONFS_BIND] = "BIND",
 456                 [FUNCTIONFS_UNBIND] = "UNBIND",
 457                 [FUNCTIONFS_ENABLE] = "ENABLE",
 458                 [FUNCTIONFS_DISABLE] = "DISABLE",
 459                 [FUNCTIONFS_SETUP] = "SETUP",
 460                 [FUNCTIONFS_SUSPEND] = "SUSPEND",
 461                 [FUNCTIONFS_RESUME] = "RESUME",
 462         };
 463
 464         const struct usb_functionfs_event *event = buf;
 465         size_t n;
 466
 467         (void)ignore;
 468
 469         for (n = nbytes / sizeof *event; n; --n, ++event)
 470                 switch (event->type) {
 471                 case FUNCTIONFS_BIND:
 472                 case FUNCTIONFS_UNBIND:
 473                 case FUNCTIONFS_ENABLE:
 474                 case FUNCTIONFS_DISABLE:
 475                 case FUNCTIONFS_SETUP:
 476                 case FUNCTIONFS_SUSPEND:
 477                 case FUNCTIONFS_RESUME:
 478                         printf("Event %s\n", names[event->type]);
 479                         if (event->type == FUNCTIONFS_SETUP)
 480                                 handle_setup(&event->u.setup);
 481                         break;
 482
 483                 default:
 484                         printf("Event %03u (unknown)\n", event->type);
 485                 }
 486
 487         return nbytes;
 488 }
 489
 490 static void ep0_init(struct thread *t)
 491 {
 492         ssize_t ret;
 493
 494         info("%s: writing descriptors\n", t->filename);
 495         ret = write(t->fd, &descriptors, sizeof descriptors);
 496         die_on(ret < 0, "%s: write: descriptors", t->filename);
 497
 498         info("%s: writing strings\n", t->filename);
 499         ret = write(t->fd, &strings, sizeof strings);
 500         die_on(ret < 0, "%s: write: strings", t->filename);
 501 }
 502
 503
 504 /******************** Main **************************************************/
 505
 506 int main(void)
 507 {
 508         unsigned i;
 509
 510         /* XXX TODO: Argument parsing missing */
 511
 512         init_thread(threads);
 513         ep0_init(threads);
 514
 515         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 516                 init_thread(threads + i);
 517
 518         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 519                 start_thread(threads + i);
 520
 521         start_thread_helper(threads);
 522
 523         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 524                 join_thread(threads + i);
 525
 526         return 0;
 527 }