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