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25#define _BSD_SOURCE
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
40#include "../../include/linux/usb/functionfs.h"
41
42
43
44
45#define cpu_to_le16(x) htole16(x)
46#define cpu_to_le32(x) htole32(x)
47#define le32_to_cpu(x) le32toh(x)
48#define le16_to_cpu(x) le16toh(x)
49
50static inline __u16 get_unaligned_le16(const void *_ptr)
51{
52 const __u8 *ptr = _ptr;
53 return ptr[0] | (ptr[1] << 8);
54}
55
56static inline __u32 get_unaligned_le32(const void *_ptr)
57{
58 const __u8 *ptr = _ptr;
59 return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24);
60}
61
62static inline void put_unaligned_le16(__u16 val, void *_ptr)
63{
64 __u8 *ptr = _ptr;
65 *ptr++ = val;
66 *ptr++ = val >> 8;
67}
68
69static inline void put_unaligned_le32(__u32 val, void *_ptr)
70{
71 __u8 *ptr = _ptr;
72 *ptr++ = val;
73 *ptr++ = val >> 8;
74 *ptr++ = val >> 16;
75 *ptr++ = val >> 24;
76}
77
78
79
80
81static const char argv0[] = "ffs-test";
82
83static unsigned verbosity = 7;
84
85static void _msg(unsigned level, const char *fmt, ...)
86{
87 if (level < 2)
88 level = 2;
89 else if (level > 7)
90 level = 7;
91
92 if (level <= verbosity) {
93 static const char levels[8][6] = {
94 [2] = "crit:",
95 [3] = "err: ",
96 [4] = "warn:",
97 [5] = "note:",
98 [6] = "info:",
99 [7] = "dbg: "
100 };
101
102 int _errno = errno;
103 va_list ap;
104
105 fprintf(stderr, "%s: %s ", argv0, levels[level]);
106 va_start(ap, fmt);
107 vfprintf(stderr, fmt, ap);
108 va_end(ap);
109
110 if (fmt[strlen(fmt) - 1] != '\n') {
111 char buffer[128];
112 strerror_r(_errno, buffer, sizeof buffer);
113 fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
114 }
115
116 fflush(stderr);
117 }
118}
119
120#define die(...) (_msg(2, __VA_ARGS__), exit(1))
121#define err(...) _msg(3, __VA_ARGS__)
122#define warn(...) _msg(4, __VA_ARGS__)
123#define note(...) _msg(5, __VA_ARGS__)
124#define info(...) _msg(6, __VA_ARGS__)
125#define debug(...) _msg(7, __VA_ARGS__)
126
127#define die_on(cond, ...) do { \
128 if (cond) \
129 die(__VA_ARGS__); \
130 } while (0)
131
132
133
134
135static const struct {
136 struct usb_functionfs_descs_head header;
137 struct {
138 struct usb_interface_descriptor intf;
139 struct usb_endpoint_descriptor_no_audio sink;
140 struct usb_endpoint_descriptor_no_audio source;
141 } __attribute__((packed)) fs_descs, hs_descs;
142} __attribute__((packed)) descriptors = {
143 .header = {
144 .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC),
145 .length = cpu_to_le32(sizeof descriptors),
146 .fs_count = 3,
147 .hs_count = 3,
148 },
149 .fs_descs = {
150 .intf = {
151 .bLength = sizeof descriptors.fs_descs.intf,
152 .bDescriptorType = USB_DT_INTERFACE,
153 .bNumEndpoints = 2,
154 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
155 .iInterface = 1,
156 },
157 .sink = {
158 .bLength = sizeof descriptors.fs_descs.sink,
159 .bDescriptorType = USB_DT_ENDPOINT,
160 .bEndpointAddress = 1 | USB_DIR_IN,
161 .bmAttributes = USB_ENDPOINT_XFER_BULK,
162
163 },
164 .source = {
165 .bLength = sizeof descriptors.fs_descs.source,
166 .bDescriptorType = USB_DT_ENDPOINT,
167 .bEndpointAddress = 2 | USB_DIR_OUT,
168 .bmAttributes = USB_ENDPOINT_XFER_BULK,
169
170 },
171 },
172 .hs_descs = {
173 .intf = {
174 .bLength = sizeof descriptors.fs_descs.intf,
175 .bDescriptorType = USB_DT_INTERFACE,
176 .bNumEndpoints = 2,
177 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
178 .iInterface = 1,
179 },
180 .sink = {
181 .bLength = sizeof descriptors.hs_descs.sink,
182 .bDescriptorType = USB_DT_ENDPOINT,
183 .bEndpointAddress = 1 | USB_DIR_IN,
184 .bmAttributes = USB_ENDPOINT_XFER_BULK,
185 .wMaxPacketSize = cpu_to_le16(512),
186 },
187 .source = {
188 .bLength = sizeof descriptors.hs_descs.source,
189 .bDescriptorType = USB_DT_ENDPOINT,
190 .bEndpointAddress = 2 | USB_DIR_OUT,
191 .bmAttributes = USB_ENDPOINT_XFER_BULK,
192 .wMaxPacketSize = cpu_to_le16(512),
193 .bInterval = 1,
194 },
195 },
196};
197
198
199#define STR_INTERFACE_ "Source/Sink"
200
201static const struct {
202 struct usb_functionfs_strings_head header;
203 struct {
204 __le16 code;
205 const char str1[sizeof STR_INTERFACE_];
206 } __attribute__((packed)) lang0;
207} __attribute__((packed)) strings = {
208 .header = {
209 .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
210 .length = cpu_to_le32(sizeof strings),
211 .str_count = cpu_to_le32(1),
212 .lang_count = cpu_to_le32(1),
213 },
214 .lang0 = {
215 cpu_to_le16(0x0409),
216 STR_INTERFACE_,
217 },
218};
219
220#define STR_INTERFACE strings.lang0.str1
221
222
223
224
225struct thread;
226
227static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
228static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
229static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
230static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
231static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
232
233
234static struct thread {
235 const char *const filename;
236 size_t buf_size;
237
238 ssize_t (*in)(struct thread *, void *, size_t);
239 const char *const in_name;
240
241 ssize_t (*out)(struct thread *, const void *, size_t);
242 const char *const out_name;
243
244 int fd;
245 pthread_t id;
246 void *buf;
247 ssize_t status;
248} threads[] = {
249 {
250 "ep0", 4 * sizeof(struct usb_functionfs_event),
251 read_wrap, NULL,
252 ep0_consume, "<consume>",
253 0, 0, NULL, 0
254 },
255 {
256 "ep1", 8 * 1024,
257 fill_in_buf, "<in>",
258 write_wrap, NULL,
259 0, 0, NULL, 0
260 },
261 {
262 "ep2", 8 * 1024,
263 read_wrap, NULL,
264 empty_out_buf, "<out>",
265 0, 0, NULL, 0
266 },
267};
268
269
270static void init_thread(struct thread *t)
271{
272 t->buf = malloc(t->buf_size);
273 die_on(!t->buf, "malloc");
274
275 t->fd = open(t->filename, O_RDWR);
276 die_on(t->fd < 0, "%s", t->filename);
277}
278
279static void cleanup_thread(void *arg)
280{
281 struct thread *t = arg;
282 int ret, fd;
283
284 fd = t->fd;
285 if (t->fd < 0)
286 return;
287 t->fd = -1;
288
289
290 if (t != threads) {
291 ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
292 if (ret < 0) {
293
294 if (errno != ENODEV)
295 err("%s: get fifo status", t->filename);
296 } else if (ret) {
297 warn("%s: unclaimed = %d\n", t->filename, ret);
298 if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
299 err("%s: fifo flush", t->filename);
300 }
301 }
302
303 if (close(fd) < 0)
304 err("%s: close", t->filename);
305
306 free(t->buf);
307 t->buf = NULL;
308}
309
310static void *start_thread_helper(void *arg)
311{
312 const char *name, *op, *in_name, *out_name;
313 struct thread *t = arg;
314 ssize_t ret;
315
316 info("%s: starts\n", t->filename);
317 in_name = t->in_name ? t->in_name : t->filename;
318 out_name = t->out_name ? t->out_name : t->filename;
319
320 pthread_cleanup_push(cleanup_thread, arg);
321
322 for (;;) {
323 pthread_testcancel();
324
325 ret = t->in(t, t->buf, t->buf_size);
326 if (ret > 0) {
327 ret = t->out(t, t->buf, t->buf_size);
328 name = out_name;
329 op = "write";
330 } else {
331 name = in_name;
332 op = "read";
333 }
334
335 if (ret > 0) {
336
337 } else if (!ret) {
338 debug("%s: %s: EOF", name, op);
339 break;
340 } else if (errno == EINTR || errno == EAGAIN) {
341 debug("%s: %s", name, op);
342 } else {
343 warn("%s: %s", name, op);
344 break;
345 }
346 }
347
348 pthread_cleanup_pop(1);
349
350 t->status = ret;
351 info("%s: ends\n", t->filename);
352 return NULL;
353}
354
355static void start_thread(struct thread *t)
356{
357 debug("%s: starting\n", t->filename);
358
359 die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
360 "pthread_create(%s)", t->filename);
361}
362
363static void join_thread(struct thread *t)
364{
365 int ret = pthread_join(t->id, NULL);
366
367 if (ret < 0)
368 err("%s: joining thread", t->filename);
369 else
370 debug("%s: joined\n", t->filename);
371}
372
373
374static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
375{
376 return read(t->fd, buf, nbytes);
377}
378
379static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
380{
381 return write(t->fd, buf, nbytes);
382}
383
384
385
386
387
388enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
389static enum pattern pattern;
390
391static ssize_t
392fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
393{
394 size_t i;
395 __u8 *p;
396
397 (void)ignore;
398
399 switch (pattern) {
400 case PAT_ZERO:
401 memset(buf, 0, nbytes);
402 break;
403
404 case PAT_SEQ:
405 for (p = buf, i = 0; i < nbytes; ++i, ++p)
406 *p = i % 63;
407 break;
408
409 case PAT_PIPE:
410 return fread(buf, 1, nbytes, stdin);
411 }
412
413 return nbytes;
414}
415
416static ssize_t
417empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
418{
419 const __u8 *p;
420 __u8 expected;
421 ssize_t ret;
422 size_t len;
423
424 (void)ignore;
425
426 switch (pattern) {
427 case PAT_ZERO:
428 expected = 0;
429 for (p = buf, len = 0; len < nbytes; ++p, ++len)
430 if (*p)
431 goto invalid;
432 break;
433
434 case PAT_SEQ:
435 for (p = buf, len = 0; len < nbytes; ++p, ++len)
436 if (*p != len % 63) {
437 expected = len % 63;
438 goto invalid;
439 }
440 break;
441
442 case PAT_PIPE:
443 ret = fwrite(buf, nbytes, 1, stdout);
444 if (ret > 0)
445 fflush(stdout);
446 break;
447
448invalid:
449 err("bad OUT byte %zd, expected %02x got %02x\n",
450 len, expected, *p);
451 for (p = buf, len = 0; len < nbytes; ++p, ++len) {
452 if (0 == (len % 32))
453 fprintf(stderr, "%4zd:", len);
454 fprintf(stderr, " %02x", *p);
455 if (31 == (len % 32))
456 fprintf(stderr, "\n");
457 }
458 fflush(stderr);
459 errno = EILSEQ;
460 return -1;
461 }
462
463 return len;
464}
465
466
467
468
469static void handle_setup(const struct usb_ctrlrequest *setup)
470{
471 printf("bRequestType = %d\n", setup->bRequestType);
472 printf("bRequest = %d\n", setup->bRequest);
473 printf("wValue = %d\n", le16_to_cpu(setup->wValue));
474 printf("wIndex = %d\n", le16_to_cpu(setup->wIndex));
475 printf("wLength = %d\n", le16_to_cpu(setup->wLength));
476}
477
478static ssize_t
479ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
480{
481 static const char *const names[] = {
482 [FUNCTIONFS_BIND] = "BIND",
483 [FUNCTIONFS_UNBIND] = "UNBIND",
484 [FUNCTIONFS_ENABLE] = "ENABLE",
485 [FUNCTIONFS_DISABLE] = "DISABLE",
486 [FUNCTIONFS_SETUP] = "SETUP",
487 [FUNCTIONFS_SUSPEND] = "SUSPEND",
488 [FUNCTIONFS_RESUME] = "RESUME",
489 };
490
491 const struct usb_functionfs_event *event = buf;
492 size_t n;
493
494 (void)ignore;
495
496 for (n = nbytes / sizeof *event; n; --n, ++event)
497 switch (event->type) {
498 case FUNCTIONFS_BIND:
499 case FUNCTIONFS_UNBIND:
500 case FUNCTIONFS_ENABLE:
501 case FUNCTIONFS_DISABLE:
502 case FUNCTIONFS_SETUP:
503 case FUNCTIONFS_SUSPEND:
504 case FUNCTIONFS_RESUME:
505 printf("Event %s\n", names[event->type]);
506 if (event->type == FUNCTIONFS_SETUP)
507 handle_setup(&event->u.setup);
508 break;
509
510 default:
511 printf("Event %03u (unknown)\n", event->type);
512 }
513
514 return nbytes;
515}
516
517static void ep0_init(struct thread *t)
518{
519 ssize_t ret;
520
521 info("%s: writing descriptors\n", t->filename);
522 ret = write(t->fd, &descriptors, sizeof descriptors);
523 die_on(ret < 0, "%s: write: descriptors", t->filename);
524
525 info("%s: writing strings\n", t->filename);
526 ret = write(t->fd, &strings, sizeof strings);
527 die_on(ret < 0, "%s: write: strings", t->filename);
528}
529
530
531
532
533int main(void)
534{
535 unsigned i;
536
537
538
539 init_thread(threads);
540 ep0_init(threads);
541
542 for (i = 1; i < sizeof threads / sizeof *threads; ++i)
543 init_thread(threads + i);
544
545 for (i = 1; i < sizeof threads / sizeof *threads; ++i)
546 start_thread(threads + i);
547
548 start_thread_helper(threads);
549
550 for (i = 1; i < sizeof threads / sizeof *threads; ++i)
551 join_thread(threads + i);
552
553 return 0;
554}
555
