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1 | #include <stdio.h> |
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2 | #include <string.h> |
3 | #include <stdint.h> |
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4 | #include <sys/types.h> |
5 | #include <sys/stat.h> |
6 | #include <fcntl.h> |
7 | #include <sys/ioctl.h> |
8 | #include <sys/select.h> |
9 | #include <unistd.h> |
10 | #include <dirent.h> |
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11 | #include <signal.h> |
12 | #include <termios.h> |
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13 | #include <errno.h> |
14 | #include <linux/usbdevice_fs.h> |
15 | #include <linux/usb/ch9.h> |
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16 | #include <linux/input.h> |
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17 | |
18 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
19 | |
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20 | struct teensy_dev { |
21 | int fd; |
22 | struct { |
23 | int ep_in; |
24 | int ep_out; |
25 | } ifaces[2]; |
26 | }; |
27 | |
28 | /* return 1 if founf, 0 if not, < 0 on error */ |
29 | static int find_device(struct teensy_dev *dev, |
30 | uint16_t vendor, uint16_t product) |
31 | { |
32 | const char path_root[] = "/dev/bus/usb"; |
33 | union { |
34 | struct usb_descriptor_header hdr; |
35 | struct usb_device_descriptor d; |
36 | struct usb_config_descriptor c; |
37 | struct usb_interface_descriptor i; |
38 | struct usb_endpoint_descriptor e; |
39 | char space[0x100]; /* enough? */ |
40 | } desc; |
41 | char path_bus[256], path_dev[256]; |
42 | struct dirent *ent, *ent_bus; |
43 | DIR *dir = NULL, *dir_bus = NULL; |
44 | int num, fd = -1; |
45 | int iface = -1; |
46 | int retval = -1; |
47 | int ret; |
48 | |
49 | memset(dev, 0xff, sizeof(*dev)); |
50 | |
51 | dir = opendir(path_root); |
52 | if (dir == NULL) { |
53 | perror("opendir"); |
54 | return -1; |
55 | } |
56 | |
57 | for (ent = readdir(dir); ent != NULL; ent = readdir(dir)) { |
58 | /* should be a number like 000 */ |
59 | if (sscanf(ent->d_name, "%03d", &num) != 1) |
60 | continue; |
61 | |
62 | snprintf(path_bus, sizeof(path_bus), "%s/%s", |
63 | path_root, ent->d_name); |
64 | |
65 | dir_bus = opendir(path_bus); |
66 | if (dir_bus == NULL) |
67 | continue; |
68 | |
69 | ent_bus = readdir(dir_bus); |
70 | for (; ent_bus != NULL; ent_bus = readdir(dir_bus)) { |
71 | if (sscanf(ent->d_name, "%03d", &num) != 1) |
72 | continue; |
73 | |
74 | snprintf(path_dev, sizeof(path_dev), "%s/%s/%s", |
75 | path_root, ent->d_name, ent_bus->d_name); |
76 | |
77 | fd = open(path_dev, O_RDWR); |
78 | if (fd == -1) |
79 | continue; |
80 | |
81 | ret = read(fd, &desc.d, sizeof(desc.d)); |
82 | if (ret != sizeof(desc.d)) { |
83 | fprintf(stderr, "desc read: %d/%zd: ", ret, sizeof(desc.d)); |
84 | perror(""); |
85 | goto next; |
86 | } |
87 | |
88 | if (desc.d.bDescriptorType != USB_DT_DEVICE) { |
89 | fprintf(stderr, "%s: bad DT: 0x%02x\n", |
90 | path_dev, desc.d.bDescriptorType); |
91 | goto next; |
92 | } |
93 | |
94 | if (desc.d.idVendor == vendor && desc.d.idProduct == product) |
95 | goto found; |
96 | |
97 | next: |
98 | close(fd); |
99 | fd = -1; |
100 | } |
101 | |
102 | closedir(dir_bus); |
103 | dir_bus = NULL; |
104 | } |
105 | |
106 | /* not found */ |
107 | retval = 0; |
108 | goto out; |
109 | |
110 | found: |
111 | if (desc.d.bNumConfigurations != 1) { |
112 | fprintf(stderr, "unexpected bNumConfigurations: %u\n", |
113 | desc.d.bNumConfigurations); |
114 | goto out; |
115 | } |
116 | |
117 | /* walk through all descriptors */ |
118 | while (1) |
119 | { |
120 | ret = read(fd, &desc.hdr, sizeof(desc.hdr)); |
121 | if (ret == 0) |
122 | break; |
123 | if (ret != sizeof(desc.hdr)) { |
124 | fprintf(stderr, "desc.hdr read: %d/%zd: ", ret, sizeof(desc.hdr)); |
125 | perror(""); |
126 | break; |
127 | } |
128 | |
129 | ret = (int)lseek(fd, -sizeof(desc.hdr), SEEK_CUR); |
130 | if (ret == -1) { |
131 | perror("lseek"); |
132 | break; |
133 | } |
134 | |
135 | ret = read(fd, &desc, desc.hdr.bLength); |
136 | if (ret != desc.hdr.bLength) { |
137 | fprintf(stderr, "desc read: %d/%u: ", ret, desc.hdr.bLength); |
138 | perror(""); |
139 | break; |
140 | } |
141 | |
142 | switch (desc.hdr.bDescriptorType) { |
143 | case USB_DT_CONFIG: |
144 | if (desc.c.bNumInterfaces != 2) { |
145 | fprintf(stderr, "unexpected bNumInterfaces: %u\n", |
146 | desc.c.bNumInterfaces); |
147 | goto out; |
148 | } |
149 | break; |
150 | |
151 | case USB_DT_INTERFACE: |
152 | if (desc.i.bInterfaceClass != USB_CLASS_HID |
153 | || desc.i.bInterfaceSubClass != 0 |
154 | || desc.i.bInterfaceProtocol != 0) { |
155 | fprintf(stderr, "unexpected interface %x:%x:%x\n", |
156 | desc.i.bInterfaceClass, desc.i.bInterfaceSubClass, |
157 | desc.i.bInterfaceProtocol); |
158 | goto out; |
159 | } |
160 | if (desc.i.bNumEndpoints != 2) { |
161 | fprintf(stderr, "unexpected bNumEndpoints: %u\n", |
162 | desc.i.bNumEndpoints); |
163 | goto out; |
164 | } |
165 | iface++; |
166 | break; |
167 | |
168 | case USB_DT_ENDPOINT: |
169 | if (iface < 0 || iface >= ARRAY_SIZE(dev->ifaces)) { |
170 | fprintf(stderr, "bad iface: %d\n", iface); |
171 | goto out; |
172 | } |
173 | if (desc.e.wMaxPacketSize != 64 && desc.e.wMaxPacketSize != 32) { |
174 | fprintf(stderr, "iface %d, EP %02x: " |
175 | "unexpected wMaxPacketSize: %u\n", |
176 | iface, desc.e.bEndpointAddress, desc.e.wMaxPacketSize); |
177 | goto out; |
178 | } |
179 | if (desc.e.bEndpointAddress & 0x80) |
180 | dev->ifaces[iface].ep_in = desc.e.bEndpointAddress; // & 0x7F; |
181 | else |
182 | dev->ifaces[iface].ep_out = desc.e.bEndpointAddress; |
183 | break; |
184 | |
185 | case 0x21: |
186 | /* ignore */ |
187 | break; |
188 | |
189 | default: |
190 | fprintf(stderr, "skipping desc 0x%02x\n", |
191 | desc.hdr.bDescriptorType); |
192 | break; |
193 | } |
194 | } |
195 | |
196 | /* claim interfaces */ |
197 | for (iface = 0; iface < ARRAY_SIZE(dev->ifaces); iface++) { |
198 | struct usbdevfs_ioctl usbio; |
199 | |
200 | if (dev->ifaces[iface].ep_in == -1) { |
201 | fprintf(stderr, "missing ep_in, iface: %d\n", iface); |
202 | goto out; |
203 | } |
204 | if (dev->ifaces[iface].ep_out == -1) { |
205 | fprintf(stderr, "missing ep_out, iface: %d\n", iface); |
206 | goto out; |
207 | } |
208 | |
209 | /* disconnect default driver */ |
210 | memset(&usbio, 0, sizeof(usbio)); |
211 | usbio.ifno = iface; |
212 | usbio.ioctl_code = USBDEVFS_DISCONNECT; |
213 | ret = ioctl(fd, USBDEVFS_IOCTL, &usbio); |
214 | if (ret != 0 && errno != ENODATA) |
215 | perror("USBDEVFS_DISCONNECT"); |
216 | |
217 | ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &iface); |
218 | if (ret != 0) |
219 | perror("USBDEVFS_CLAIMINTERFACE"); |
220 | } |
221 | |
222 | dev->fd = fd; |
223 | fd = -1; |
224 | retval = 1; |
225 | |
226 | out: |
227 | if (fd != -1) |
228 | close(fd); |
229 | if (dir_bus != NULL) |
230 | closedir(dir_bus); |
231 | if (dir != NULL) |
232 | closedir(dir); |
233 | |
234 | return retval; |
235 | } |
236 | |
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237 | static int enable_echo(int enable) |
238 | { |
239 | const char *portname = "/dev/tty"; |
240 | struct termios tty; |
241 | int retval = -1; |
242 | int ret; |
243 | int fd; |
244 | |
245 | memset(&tty, 0, sizeof(tty)); |
246 | |
247 | fd = open(portname, O_RDWR | O_NOCTTY | O_SYNC); |
248 | if (fd < 0) { |
249 | fprintf(stderr, "open %s: ", portname); |
250 | perror(""); |
251 | return 1; |
252 | } |
253 | |
254 | ret = tcgetattr(fd, &tty); |
255 | if (ret != 0) { |
256 | perror("tcgetattr"); |
257 | goto out; |
258 | } |
259 | |
260 | // printf("lflag: 0%o\n", tty.c_lflag); |
261 | if (enable) |
262 | tty.c_lflag |= ECHO; |
263 | else |
264 | tty.c_lflag &= ~ECHO; |
265 | |
266 | ret = tcsetattr(fd, TCSANOW, &tty); |
267 | if (ret != 0) { |
268 | perror("tcsetattr"); |
269 | goto out; |
270 | } |
271 | |
272 | retval = 0; |
273 | out: |
274 | close(fd); |
275 | |
276 | return retval; |
277 | } |
278 | |
279 | static void signal_handler(int sig) |
280 | { |
281 | enable_echo(1); |
282 | signal(sig, SIG_DFL); |
283 | raise(sig); |
284 | } |
285 | |
1cb2822f |
286 | /* ?0SA 00DU, ?1CB RLDU */ |
287 | #define STATE_BYTES 2 |
288 | |
289 | static uint8_t fixed_input_state[STATE_BYTES] = { 0x33, 0x3f }; |
290 | |
291 | enum mdbtn { |
292 | MDBTN_UP = 1, |
293 | MDBTN_DOWN, |
294 | MDBTN_LEFT, |
295 | MDBTN_RIGHT, |
296 | MDBTN_A, |
297 | MDBTN_B, |
298 | MDBTN_C, |
299 | MDBTN_START, |
300 | }; |
301 | |
302 | static const enum mdbtn evdev_md_map[KEY_CNT] = { |
303 | [KEY_UP] = MDBTN_UP, |
304 | [KEY_DOWN] = MDBTN_DOWN, |
305 | [KEY_LEFT] = MDBTN_LEFT, |
306 | [KEY_RIGHT] = MDBTN_RIGHT, |
307 | [KEY_HOME] = MDBTN_A, |
308 | [KEY_PAGEDOWN] = MDBTN_B, |
309 | [KEY_END] = MDBTN_C, |
310 | [KEY_LEFTALT] = MDBTN_START, |
311 | }; |
312 | |
313 | int do_evdev_input(int fd) |
314 | { |
315 | uint8_t old_state[STATE_BYTES]; |
316 | uint8_t changed_bits[STATE_BYTES] = { 0, }; |
317 | struct input_event ev; |
318 | enum mdbtn mdbtn; |
319 | int i, ret; |
320 | |
321 | ret = read(fd, &ev, sizeof(ev)); |
322 | if (ret != sizeof(ev)) { |
323 | fprintf(stderr, "evdev read %d/%zd: ", ret, sizeof(ev)); |
324 | perror(""); |
325 | return 0; |
326 | } |
327 | |
328 | if (ev.type != EV_KEY) |
329 | return 0; |
330 | |
331 | if (ev.value != 0 && ev.value != 1) |
332 | return 0; |
333 | |
334 | if ((uint32_t)ev.code >= ARRAY_SIZE(evdev_md_map)) { |
335 | fprintf(stderr, "evdev read bad key: %u\n", ev.code); |
336 | return 0; |
337 | } |
338 | |
339 | mdbtn = evdev_md_map[ev.code]; |
340 | if (mdbtn == 0) |
341 | return 0; |
342 | |
343 | memcpy(old_state, fixed_input_state, STATE_BYTES); |
344 | |
345 | /* ?0SA 00DU, ?1CB RLDU */ |
346 | switch (mdbtn) { |
347 | case MDBTN_UP: |
348 | changed_bits[0] = 0x01; |
349 | changed_bits[1] = 0x01; |
350 | break; |
351 | case MDBTN_DOWN: |
352 | changed_bits[0] = 0x02; |
353 | changed_bits[1] = 0x02; |
354 | break; |
355 | case MDBTN_LEFT: |
356 | changed_bits[0] = 0x00; |
357 | changed_bits[1] = 0x04; |
358 | break; |
359 | case MDBTN_RIGHT: |
360 | changed_bits[0] = 0x00; |
361 | changed_bits[1] = 0x08; |
362 | break; |
363 | case MDBTN_A: |
364 | changed_bits[0] = 0x10; |
365 | changed_bits[1] = 0x00; |
366 | break; |
367 | case MDBTN_B: |
368 | changed_bits[0] = 0x00; |
369 | changed_bits[1] = 0x10; |
370 | break; |
371 | case MDBTN_C: |
372 | changed_bits[0] = 0x00; |
373 | changed_bits[1] = 0x20; |
374 | break; |
375 | case MDBTN_START: |
376 | changed_bits[0] = 0x20; |
377 | changed_bits[1] = 0x00; |
378 | break; |
379 | } |
380 | |
381 | if (ev.value) { |
382 | // key press |
383 | for (i = 0; i < STATE_BYTES; i++) |
384 | fixed_input_state[i] &= ~changed_bits[i]; |
385 | } |
386 | else { |
387 | // key release |
388 | for (i = 0; i < STATE_BYTES; i++) |
389 | fixed_input_state[i] |= changed_bits[i]; |
390 | } |
391 | |
392 | return memcmp(old_state, fixed_input_state, STATE_BYTES) ? 1 : 0; |
393 | } |
394 | |
932302ef |
395 | enum my_urbs { |
396 | URB_DATA_IN, |
397 | URB_DATA_OUT, |
398 | URB_DBG_IN, |
399 | URB_CNT |
400 | }; |
401 | |
402 | int main(int argc, char *argv[]) |
403 | { |
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404 | char buf_dbg[64 + 1], buf_in[64], buf_out[64]; |
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405 | struct teensy_dev dev; |
406 | struct usbdevfs_urb urb[URB_CNT]; |
407 | struct usbdevfs_urb *reaped_urb; |
1cb2822f |
408 | int fixed_input_changed; |
409 | int evdev_fds[16]; |
410 | int evdev_fd_cnt = 0; |
411 | int evdev_support; |
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412 | int wait_device = 0; |
413 | int dbg_in_sent = 0; |
414 | int data_in_sent = 0; |
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415 | fd_set rfds, wfds; |
416 | int i, ret; |
417 | int fd; |
418 | |
419 | for (i = 1; i < argc; i++) { |
420 | if (evdev_fd_cnt >= ARRAY_SIZE(evdev_fds)) { |
421 | fprintf(stderr, "too many evdevs\n"); |
422 | break; |
423 | } |
424 | fd = open(argv[i], O_RDONLY); |
425 | if (fd == -1) { |
426 | fprintf(stderr, "open %s: ", argv[i]); |
427 | perror(""); |
428 | continue; |
429 | } |
430 | evdev_support = 0; |
431 | ret = ioctl(fd, EVIOCGBIT(0, sizeof(evdev_support)), |
432 | &evdev_support); |
433 | if (ret < 0) |
434 | perror("EVIOCGBIT"); |
435 | if (!(evdev_support & (1 << EV_KEY))) { |
436 | fprintf(stderr, "%s doesn't have keys\n", argv[i]); |
437 | close(fd); |
438 | continue; |
439 | } |
440 | evdev_fds[evdev_fd_cnt++] = fd; |
441 | } |
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442 | |
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443 | enable_echo(0); |
444 | signal(SIGINT, signal_handler); |
445 | |
932302ef |
446 | dev.fd = -1; |
447 | |
448 | while (1) |
449 | { |
450 | if (dev.fd == -1) { |
451 | ret = find_device(&dev, 0x16C0, 0x0486); |
452 | if (ret < 0) |
f359b935 |
453 | break; |
932302ef |
454 | |
455 | if (ret == 0) { |
456 | if (!wait_device) { |
457 | printf("waiting for device..\n"); |
458 | wait_device = 1; |
459 | } |
460 | usleep(250000); |
461 | continue; |
462 | } |
463 | |
464 | wait_device = 0; |
465 | data_in_sent = 0; |
466 | dbg_in_sent = 0; |
467 | } |
468 | |
469 | if (!data_in_sent) { |
470 | memset(&urb[URB_DATA_IN], 0, sizeof(urb[URB_DATA_IN])); |
471 | urb[URB_DATA_IN].type = USBDEVFS_URB_TYPE_INTERRUPT; |
472 | urb[URB_DATA_IN].endpoint = dev.ifaces[0].ep_in; |
473 | urb[URB_DATA_IN].buffer = buf_in; |
474 | urb[URB_DATA_IN].buffer_length = sizeof(buf_in); |
475 | |
476 | ret = ioctl(dev.fd, USBDEVFS_SUBMITURB, &urb[URB_DATA_IN]); |
477 | if (ret != 0) { |
478 | perror("USBDEVFS_SUBMITURB URB_DATA_IN"); |
f359b935 |
479 | break; |
932302ef |
480 | } |
481 | data_in_sent = 1; |
482 | } |
483 | if (!dbg_in_sent) { |
484 | memset(&urb[URB_DBG_IN], 0, sizeof(urb[URB_DBG_IN])); |
485 | urb[URB_DBG_IN].type = USBDEVFS_URB_TYPE_INTERRUPT; |
486 | urb[URB_DBG_IN].endpoint = dev.ifaces[1].ep_in; |
487 | urb[URB_DBG_IN].buffer = buf_dbg; |
488 | urb[URB_DBG_IN].buffer_length = sizeof(buf_dbg) - 1; |
489 | |
490 | ret = ioctl(dev.fd, USBDEVFS_SUBMITURB, &urb[URB_DBG_IN]); |
491 | if (ret != 0) { |
492 | perror("USBDEVFS_SUBMITURB URB_DBG_IN"); |
f359b935 |
493 | break; |
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494 | } |
495 | dbg_in_sent = 1; |
496 | } |
497 | |
1cb2822f |
498 | FD_ZERO(&rfds); |
499 | for (i = 0; i < evdev_fd_cnt; i++) |
500 | FD_SET(evdev_fds[i], &rfds); |
501 | |
932302ef |
502 | FD_ZERO(&wfds); |
503 | FD_SET(dev.fd, &wfds); |
504 | |
1cb2822f |
505 | ret = select(dev.fd + 1, &rfds, &wfds, NULL, NULL); |
932302ef |
506 | if (ret < 0) { |
507 | perror("select"); |
f359b935 |
508 | break; |
932302ef |
509 | } |
510 | |
1cb2822f |
511 | /* something from input devices? */ |
512 | fixed_input_changed = 0; |
513 | for (i = 0; i < evdev_fd_cnt; i++) { |
514 | if (FD_ISSET(evdev_fds[i], &rfds)) { |
515 | fixed_input_changed |= |
516 | do_evdev_input(evdev_fds[i]); |
517 | } |
518 | } |
519 | |
520 | /* something from USB? */ |
932302ef |
521 | if (FD_ISSET(dev.fd, &wfds)) { |
522 | reaped_urb = NULL; |
523 | ret = ioctl(dev.fd, USBDEVFS_REAPURB, &reaped_urb); |
524 | if (ret != 0) { |
525 | if (errno == ENODEV) |
526 | goto dev_close; |
527 | perror("USBDEVFS_REAPURB"); |
f359b935 |
528 | break; |
932302ef |
529 | } |
530 | |
531 | if (reaped_urb != NULL && reaped_urb->status != 0) { |
532 | errno = -reaped_urb->status; |
533 | perror("urb status"); |
534 | if (reaped_urb->status == -EILSEQ) { |
535 | /* this is usually a sign of disconnect.. */ |
536 | usleep(250000); |
537 | goto dev_close; |
538 | } |
539 | } |
540 | |
541 | if (reaped_urb == &urb[URB_DATA_IN]) { |
542 | printf("*data*\n"); |
543 | data_in_sent = 0; |
544 | } |
1cb2822f |
545 | if (reaped_urb == &urb[URB_DATA_OUT]) { |
546 | } |
932302ef |
547 | else if (reaped_urb == &urb[URB_DBG_IN]) { |
548 | /* debug text */ |
549 | buf_dbg[reaped_urb->actual_length] = 0; |
550 | printf("%s", buf_dbg); |
551 | dbg_in_sent = 0; |
552 | } |
553 | else { |
554 | fprintf(stderr, "reaped unknown urb? %p\n", reaped_urb); |
555 | } |
556 | } |
1cb2822f |
557 | |
558 | /* something to send? */ |
559 | if (fixed_input_changed) { |
560 | memset(buf_out, 0, sizeof(buf_out)); |
561 | memcpy(buf_out, fixed_input_state, sizeof(fixed_input_state)); |
562 | |
563 | memset(&urb[URB_DATA_OUT], 0, sizeof(urb[URB_DATA_OUT])); |
564 | urb[URB_DATA_OUT].type = USBDEVFS_URB_TYPE_INTERRUPT; |
565 | urb[URB_DATA_OUT].endpoint = dev.ifaces[0].ep_out; |
566 | urb[URB_DATA_OUT].buffer = buf_out; |
567 | urb[URB_DATA_OUT].buffer_length = sizeof(buf_out); |
568 | |
569 | ret = ioctl(dev.fd, USBDEVFS_SUBMITURB, &urb[URB_DATA_OUT]); |
570 | if (ret != 0) { |
571 | perror("USBDEVFS_SUBMITURB URB_DATA_OUT"); |
f359b935 |
572 | break; |
1cb2822f |
573 | } |
574 | } |
575 | |
932302ef |
576 | continue; |
577 | |
578 | dev_close: |
579 | close(dev.fd); |
580 | dev.fd = -1; |
581 | } |
582 | |
f359b935 |
583 | enable_echo(1); |
584 | |
585 | return ret; |
932302ef |
586 | } |
587 | |
588 | // vim: ts=2:sw=2:expandtab |