| 1 | /*************************************************************************** |
| 2 | ftdi.c - description |
| 3 | ------------------- |
| 4 | begin : Fri Apr 4 2003 |
| 5 | copyright : (C) 2003 by Intra2net AG |
| 6 | email : opensource@intra2net.com |
| 7 | ***************************************************************************/ |
| 8 | |
| 9 | /*************************************************************************** |
| 10 | * * |
| 11 | * This program is free software; you can redistribute it and/or modify * |
| 12 | * it under the terms of the GNU Lesser General Public License * |
| 13 | * version 2.1 as published by the Free Software Foundation; * |
| 14 | * * |
| 15 | ***************************************************************************/ |
| 16 | |
| 17 | #include <usb.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include "ftdi.h" |
| 21 | |
| 22 | /* ftdi_init return codes: |
| 23 | 0: all fine |
| 24 | -1: couldn't allocate read buffer |
| 25 | */ |
| 26 | int ftdi_init(struct ftdi_context *ftdi) |
| 27 | { |
| 28 | ftdi->usb_dev = NULL; |
| 29 | ftdi->usb_read_timeout = 5000; |
| 30 | ftdi->usb_write_timeout = 5000; |
| 31 | |
| 32 | ftdi->type = TYPE_BM; /* chip type */ |
| 33 | ftdi->baudrate = -1; |
| 34 | ftdi->bitbang_enabled = 0; |
| 35 | |
| 36 | ftdi->readbuffer = NULL; |
| 37 | ftdi->readbuffer_offset = 0; |
| 38 | ftdi->readbuffer_remaining = 0; |
| 39 | ftdi->writebuffer_chunksize = 4096; |
| 40 | |
| 41 | ftdi->interface = 0; |
| 42 | ftdi->index = 0; |
| 43 | ftdi->in_ep = 0x02; |
| 44 | ftdi->out_ep = 0x81; |
| 45 | ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */ |
| 46 | |
| 47 | ftdi->error_str = NULL; |
| 48 | |
| 49 | /* All fine. Now allocate the readbuffer */ |
| 50 | return ftdi_read_data_set_chunksize(ftdi, 4096); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | void ftdi_deinit(struct ftdi_context *ftdi) |
| 55 | { |
| 56 | if (ftdi->readbuffer != NULL) { |
| 57 | free(ftdi->readbuffer); |
| 58 | ftdi->readbuffer = NULL; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | |
| 63 | void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb) |
| 64 | { |
| 65 | ftdi->usb_dev = usb; |
| 66 | } |
| 67 | |
| 68 | |
| 69 | /* ftdi_usb_open return codes: |
| 70 | 0: all fine |
| 71 | -1: usb_find_busses() failed |
| 72 | -2: usb_find_devices() failed |
| 73 | -3: usb device not found |
| 74 | -4: unable to open device |
| 75 | -5: unable to claim device |
| 76 | -6: reset failed |
| 77 | -7: set baudrate failed |
| 78 | -8: get product description failed |
| 79 | -9: get serial number failed |
| 80 | -10: unable to close device |
| 81 | */ |
| 82 | int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product) |
| 83 | { |
| 84 | return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL); |
| 85 | } |
| 86 | |
| 87 | int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product, |
| 88 | const char* description, const char* serial) |
| 89 | { |
| 90 | struct usb_bus *bus; |
| 91 | struct usb_device *dev; |
| 92 | |
| 93 | usb_init(); |
| 94 | |
| 95 | if (usb_find_busses() < 0) { |
| 96 | ftdi->error_str = "usb_find_busses() failed"; |
| 97 | return -1; |
| 98 | } |
| 99 | |
| 100 | if (usb_find_devices() < 0) { |
| 101 | ftdi->error_str = "usb_find_devices() failed"; |
| 102 | return -2; |
| 103 | } |
| 104 | |
| 105 | for (bus = usb_busses; bus; bus = bus->next) { |
| 106 | for (dev = bus->devices; dev; dev = dev->next) { |
| 107 | if (dev->descriptor.idVendor == vendor |
| 108 | && dev->descriptor.idProduct == product) { |
| 109 | if (!(ftdi->usb_dev = usb_open(dev))) { |
| 110 | ftdi->error_str = "usb_open() failed"; |
| 111 | return -4; |
| 112 | } |
| 113 | |
| 114 | char string[256]; |
| 115 | if (description != NULL) { |
| 116 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0) { |
| 117 | ftdi->error_str = "unable to fetch product description\n"; |
| 118 | if (usb_close (ftdi->usb_dev) != 0) |
| 119 | return -10; |
| 120 | return -8; |
| 121 | } |
| 122 | if (strncmp(string, description, sizeof(string)) != 0) { |
| 123 | ftdi->error_str = "product description not matching\n"; |
| 124 | if (usb_close (ftdi->usb_dev) != 0) |
| 125 | return -10; |
| 126 | continue; |
| 127 | } |
| 128 | } |
| 129 | if (serial != NULL) { |
| 130 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0) { |
| 131 | ftdi->error_str = "unable to fetch serial number\n"; |
| 132 | if (usb_close (ftdi->usb_dev) != 0) |
| 133 | return -10; |
| 134 | return -9; |
| 135 | } |
| 136 | if (strncmp(string, serial, sizeof(string)) != 0) { |
| 137 | ftdi->error_str = "serial number not matching\n"; |
| 138 | if (usb_close (ftdi->usb_dev) != 0) |
| 139 | return -10; |
| 140 | continue; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) { |
| 145 | ftdi->error_str = "unable to claim usb device. Make sure ftdi_sio is unloaded!"; |
| 146 | if (usb_close (ftdi->usb_dev) != 0) |
| 147 | return -10; |
| 148 | return -5; |
| 149 | } |
| 150 | |
| 151 | if (ftdi_usb_reset (ftdi) != 0) { |
| 152 | if (usb_close (ftdi->usb_dev) != 0) |
| 153 | return -10; |
| 154 | return -6; |
| 155 | } |
| 156 | |
| 157 | if (ftdi_set_baudrate (ftdi, 9600) != 0) { |
| 158 | if (usb_close (ftdi->usb_dev) != 0) |
| 159 | return -10; |
| 160 | return -7; |
| 161 | } |
| 162 | |
| 163 | // Try to guess chip type |
| 164 | // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0 |
| 165 | if (dev->descriptor.bcdDevice == 0x400 || (dev->descriptor.bcdDevice == 0x200 |
| 166 | && dev->descriptor.iSerialNumber == 0)) |
| 167 | ftdi->type = TYPE_BM; |
| 168 | else if (dev->descriptor.bcdDevice == 0x200) |
| 169 | ftdi->type = TYPE_AM; |
| 170 | else if (dev->descriptor.bcdDevice == 0x500) |
| 171 | ftdi->type = TYPE_2232C; |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | // device not found |
| 179 | return -3; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | int ftdi_usb_reset(struct ftdi_context *ftdi) |
| 184 | { |
| 185 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 186 | ftdi->error_str = "FTDI reset failed"; |
| 187 | return -1; |
| 188 | } |
| 189 | // Invalidate data in the readbuffer |
| 190 | ftdi->readbuffer_offset = 0; |
| 191 | ftdi->readbuffer_remaining = 0; |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | int ftdi_usb_purge_buffers(struct ftdi_context *ftdi) |
| 197 | { |
| 198 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 199 | ftdi->error_str = "FTDI purge of RX buffer failed"; |
| 200 | return -1; |
| 201 | } |
| 202 | // Invalidate data in the readbuffer |
| 203 | ftdi->readbuffer_offset = 0; |
| 204 | ftdi->readbuffer_remaining = 0; |
| 205 | |
| 206 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 207 | ftdi->error_str = "FTDI purge of TX buffer failed"; |
| 208 | return -1; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* ftdi_usb_close return codes |
| 216 | 0: all fine |
| 217 | -1: usb_release failed |
| 218 | -2: usb_close failed |
| 219 | */ |
| 220 | int ftdi_usb_close(struct ftdi_context *ftdi) |
| 221 | { |
| 222 | int rtn = 0; |
| 223 | |
| 224 | if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0) |
| 225 | rtn = -1; |
| 226 | |
| 227 | if (usb_close (ftdi->usb_dev) != 0) |
| 228 | rtn = -2; |
| 229 | |
| 230 | return rtn; |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | ftdi_convert_baudrate returns nearest supported baud rate to that requested. |
| 236 | Function is only used internally |
| 237 | */ |
| 238 | static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi, |
| 239 | unsigned short *value, unsigned short *index) |
| 240 | { |
| 241 | static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1}; |
| 242 | static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3}; |
| 243 | static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7}; |
| 244 | int divisor, best_divisor, best_baud, best_baud_diff; |
| 245 | unsigned long encoded_divisor; |
| 246 | int i; |
| 247 | |
| 248 | if (baudrate <= 0) { |
| 249 | // Return error |
| 250 | return -1; |
| 251 | } |
| 252 | |
| 253 | divisor = 24000000 / baudrate; |
| 254 | |
| 255 | if (ftdi->type == TYPE_AM) { |
| 256 | // Round down to supported fraction (AM only) |
| 257 | divisor -= am_adjust_dn[divisor & 7]; |
| 258 | } |
| 259 | |
| 260 | // Try this divisor and the one above it (because division rounds down) |
| 261 | best_divisor = 0; |
| 262 | best_baud = 0; |
| 263 | best_baud_diff = 0; |
| 264 | for (i = 0; i < 2; i++) { |
| 265 | int try_divisor = divisor + i; |
| 266 | int baud_estimate; |
| 267 | int baud_diff; |
| 268 | |
| 269 | // Round up to supported divisor value |
| 270 | if (try_divisor < 8) { |
| 271 | // Round up to minimum supported divisor |
| 272 | try_divisor = 8; |
| 273 | } else if (ftdi->type != TYPE_AM && try_divisor < 12) { |
| 274 | // BM doesn't support divisors 9 through 11 inclusive |
| 275 | try_divisor = 12; |
| 276 | } else if (divisor < 16) { |
| 277 | // AM doesn't support divisors 9 through 15 inclusive |
| 278 | try_divisor = 16; |
| 279 | } else { |
| 280 | if (ftdi->type == TYPE_AM) { |
| 281 | // Round up to supported fraction (AM only) |
| 282 | try_divisor += am_adjust_up[try_divisor & 7]; |
| 283 | if (try_divisor > 0x1FFF8) { |
| 284 | // Round down to maximum supported divisor value (for AM) |
| 285 | try_divisor = 0x1FFF8; |
| 286 | } |
| 287 | } else { |
| 288 | if (try_divisor > 0x1FFFF) { |
| 289 | // Round down to maximum supported divisor value (for BM) |
| 290 | try_divisor = 0x1FFFF; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | // Get estimated baud rate (to nearest integer) |
| 295 | baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor; |
| 296 | // Get absolute difference from requested baud rate |
| 297 | if (baud_estimate < baudrate) { |
| 298 | baud_diff = baudrate - baud_estimate; |
| 299 | } else { |
| 300 | baud_diff = baud_estimate - baudrate; |
| 301 | } |
| 302 | if (i == 0 || baud_diff < best_baud_diff) { |
| 303 | // Closest to requested baud rate so far |
| 304 | best_divisor = try_divisor; |
| 305 | best_baud = baud_estimate; |
| 306 | best_baud_diff = baud_diff; |
| 307 | if (baud_diff == 0) { |
| 308 | // Spot on! No point trying |
| 309 | break; |
| 310 | } |
| 311 | } |
| 312 | } |
| 313 | // Encode the best divisor value |
| 314 | encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14); |
| 315 | // Deal with special cases for encoded value |
| 316 | if (encoded_divisor == 1) { |
| 317 | encoded_divisor = 0; // 3000000 baud |
| 318 | } else if (encoded_divisor == 0x4001) { |
| 319 | encoded_divisor = 1; // 2000000 baud (BM only) |
| 320 | } |
| 321 | // Split into "value" and "index" values |
| 322 | *value = (unsigned short)(encoded_divisor & 0xFFFF); |
| 323 | if(ftdi->type == TYPE_2232C) { |
| 324 | *index = (unsigned short)(encoded_divisor >> 8); |
| 325 | *index &= 0xFF00; |
| 326 | *index |= ftdi->interface; |
| 327 | } |
| 328 | else |
| 329 | *index = (unsigned short)(encoded_divisor >> 16); |
| 330 | |
| 331 | // Return the nearest baud rate |
| 332 | return best_baud; |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | ftdi_set_baudrate return codes: |
| 337 | 0: all fine |
| 338 | -1: invalid baudrate |
| 339 | -2: setting baudrate failed |
| 340 | */ |
| 341 | int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate) |
| 342 | { |
| 343 | unsigned short value, index; |
| 344 | int actual_baudrate; |
| 345 | |
| 346 | if (ftdi->bitbang_enabled) { |
| 347 | baudrate = baudrate*4; |
| 348 | } |
| 349 | |
| 350 | actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index); |
| 351 | if (actual_baudrate <= 0) { |
| 352 | ftdi->error_str = "Silly baudrate <= 0."; |
| 353 | return -1; |
| 354 | } |
| 355 | |
| 356 | // Check within tolerance (about 5%) |
| 357 | if ((actual_baudrate * 2 < baudrate /* Catch overflows */ ) |
| 358 | || ((actual_baudrate < baudrate) |
| 359 | ? (actual_baudrate * 21 < baudrate * 20) |
| 360 | : (baudrate * 21 < actual_baudrate * 20))) { |
| 361 | ftdi->error_str = "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4"; |
| 362 | return -1; |
| 363 | } |
| 364 | |
| 365 | if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 366 | ftdi->error_str = "Setting new baudrate failed"; |
| 367 | return -2; |
| 368 | } |
| 369 | |
| 370 | ftdi->baudrate = baudrate; |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 376 | { |
| 377 | int ret; |
| 378 | int offset = 0; |
| 379 | int total_written = 0; |
| 380 | while (offset < size) { |
| 381 | int write_size = ftdi->writebuffer_chunksize; |
| 382 | |
| 383 | if (offset+write_size > size) |
| 384 | write_size = size-offset; |
| 385 | |
| 386 | ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout); |
| 387 | if (ret < 0) { |
| 388 | if (ret == -1) |
| 389 | ftdi->error_str = "bulk write failed"; |
| 390 | else |
| 391 | ftdi->error_str = "usb failed"; |
| 392 | return ret; |
| 393 | } |
| 394 | total_written += ret; |
| 395 | |
| 396 | offset += write_size; |
| 397 | } |
| 398 | |
| 399 | return total_written; |
| 400 | } |
| 401 | |
| 402 | |
| 403 | int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 404 | { |
| 405 | ftdi->writebuffer_chunksize = chunksize; |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | |
| 410 | int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 411 | { |
| 412 | *chunksize = ftdi->writebuffer_chunksize; |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | |
| 417 | int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 418 | { |
| 419 | int offset = 0, ret = 1, i, num_of_chunks, chunk_remains; |
| 420 | |
| 421 | // everything we want is still in the readbuffer? |
| 422 | if (size <= ftdi->readbuffer_remaining) { |
| 423 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size); |
| 424 | |
| 425 | // Fix offsets |
| 426 | ftdi->readbuffer_remaining -= size; |
| 427 | ftdi->readbuffer_offset += size; |
| 428 | |
| 429 | /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */ |
| 430 | |
| 431 | return size; |
| 432 | } |
| 433 | // something still in the readbuffer, but not enough to satisfy 'size'? |
| 434 | if (ftdi->readbuffer_remaining != 0) { |
| 435 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining); |
| 436 | |
| 437 | // Fix offset |
| 438 | offset += ftdi->readbuffer_remaining; |
| 439 | } |
| 440 | // do the actual USB read |
| 441 | while (offset < size && ret > 0) { |
| 442 | ftdi->readbuffer_remaining = 0; |
| 443 | ftdi->readbuffer_offset = 0; |
| 444 | /* returns how much received */ |
| 445 | ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout); |
| 446 | |
| 447 | if (ret < 0) { |
| 448 | if (ret == -1) |
| 449 | ftdi->error_str = "bulk read failed"; |
| 450 | else |
| 451 | ftdi->error_str = "usb failed"; |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | if (ret > 2) { |
| 456 | // skip FTDI status bytes. |
| 457 | // Maybe stored in the future to enable modem use |
| 458 | num_of_chunks = ret / 64; |
| 459 | chunk_remains = ret % 64; |
| 460 | //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset); |
| 461 | |
| 462 | ftdi->readbuffer_offset += 2; |
| 463 | ret -= 2; |
| 464 | |
| 465 | if (ret > 64) { |
| 466 | for (i = 1; i < num_of_chunks; i++) |
| 467 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 468 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 469 | 62); |
| 470 | if (chunk_remains > 2) { |
| 471 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 472 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 473 | chunk_remains-2); |
| 474 | ret -= 2*num_of_chunks; |
| 475 | } else |
| 476 | ret -= 2*(num_of_chunks-1)+chunk_remains; |
| 477 | } |
| 478 | } else if (ret <= 2) { |
| 479 | // no more data to read? |
| 480 | return offset; |
| 481 | } |
| 482 | if (ret > 0) { |
| 483 | // data still fits in buf? |
| 484 | if (offset+ret <= size) { |
| 485 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret); |
| 486 | //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]); |
| 487 | offset += ret; |
| 488 | |
| 489 | /* Did we read exactly the right amount of bytes? */ |
| 490 | if (offset == size) |
| 491 | return offset; |
| 492 | } else { |
| 493 | // only copy part of the data or size <= readbuffer_chunksize |
| 494 | int part_size = size-offset; |
| 495 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size); |
| 496 | |
| 497 | ftdi->readbuffer_offset += part_size; |
| 498 | ftdi->readbuffer_remaining = ret-part_size; |
| 499 | offset += part_size; |
| 500 | |
| 501 | /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n", |
| 502 | part_size, size, offset, ret, ftdi->readbuffer_remaining); */ |
| 503 | |
| 504 | return offset; |
| 505 | } |
| 506 | } |
| 507 | } |
| 508 | // never reached |
| 509 | return -127; |
| 510 | } |
| 511 | |
| 512 | |
| 513 | int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 514 | { |
| 515 | unsigned char *new_buf; |
| 516 | |
| 517 | // Invalidate all remaining data |
| 518 | ftdi->readbuffer_offset = 0; |
| 519 | ftdi->readbuffer_remaining = 0; |
| 520 | |
| 521 | if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) { |
| 522 | ftdi->error_str = "out of memory for readbuffer"; |
| 523 | return -1; |
| 524 | } |
| 525 | |
| 526 | ftdi->readbuffer = new_buf; |
| 527 | ftdi->readbuffer_chunksize = chunksize; |
| 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | |
| 533 | int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 534 | { |
| 535 | *chunksize = ftdi->readbuffer_chunksize; |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | |
| 540 | |
| 541 | int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask) |
| 542 | { |
| 543 | unsigned short usb_val; |
| 544 | |
| 545 | usb_val = bitmask; // low byte: bitmask |
| 546 | /* FT2232C: Set bitbang_mode to 2 to enable SPI */ |
| 547 | usb_val |= (ftdi->bitbang_mode << 8); |
| 548 | |
| 549 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 550 | ftdi->error_str = "Unable to enter bitbang mode. Perhaps not a BM type chip?"; |
| 551 | return -1; |
| 552 | } |
| 553 | ftdi->bitbang_enabled = 1; |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | |
| 558 | int ftdi_disable_bitbang(struct ftdi_context *ftdi) |
| 559 | { |
| 560 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 561 | ftdi->error_str = "Unable to leave bitbang mode. Perhaps not a BM type chip?"; |
| 562 | return -1; |
| 563 | } |
| 564 | |
| 565 | ftdi->bitbang_enabled = 0; |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | |
| 570 | int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins) |
| 571 | { |
| 572 | unsigned short usb_val; |
| 573 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) { |
| 574 | ftdi->error_str = "Read pins failed"; |
| 575 | return -1; |
| 576 | } |
| 577 | |
| 578 | *pins = (unsigned char)usb_val; |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | |
| 583 | int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency) |
| 584 | { |
| 585 | unsigned short usb_val; |
| 586 | |
| 587 | if (latency < 1) { |
| 588 | ftdi->error_str = "Latency out of range. Only valid for 1-255"; |
| 589 | return -1; |
| 590 | } |
| 591 | |
| 592 | usb_val = latency; |
| 593 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 594 | ftdi->error_str = "Unable to set latency timer"; |
| 595 | return -2; |
| 596 | } |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | |
| 601 | int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency) |
| 602 | { |
| 603 | unsigned short usb_val; |
| 604 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) { |
| 605 | ftdi->error_str = "Reading latency timer failed"; |
| 606 | return -1; |
| 607 | } |
| 608 | |
| 609 | *latency = (unsigned char)usb_val; |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | |
| 614 | void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom) |
| 615 | { |
| 616 | eeprom->vendor_id = 0x0403; |
| 617 | eeprom->product_id = 0x6001; |
| 618 | |
| 619 | eeprom->self_powered = 1; |
| 620 | eeprom->remote_wakeup = 1; |
| 621 | eeprom->BM_type_chip = 1; |
| 622 | |
| 623 | eeprom->in_is_isochronous = 0; |
| 624 | eeprom->out_is_isochronous = 0; |
| 625 | eeprom->suspend_pull_downs = 0; |
| 626 | |
| 627 | eeprom->use_serial = 0; |
| 628 | eeprom->change_usb_version = 0; |
| 629 | eeprom->usb_version = 0x0200; |
| 630 | eeprom->max_power = 0; |
| 631 | |
| 632 | eeprom->manufacturer = NULL; |
| 633 | eeprom->product = NULL; |
| 634 | eeprom->serial = NULL; |
| 635 | } |
| 636 | |
| 637 | |
| 638 | /* |
| 639 | ftdi_eeprom_build return codes: |
| 640 | positive value: used eeprom size |
| 641 | -1: eeprom size (128 bytes) exceeded by custom strings |
| 642 | */ |
| 643 | int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output) |
| 644 | { |
| 645 | unsigned char i, j; |
| 646 | unsigned short checksum, value; |
| 647 | unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0; |
| 648 | int size_check; |
| 649 | |
| 650 | if (eeprom->manufacturer != NULL) |
| 651 | manufacturer_size = strlen(eeprom->manufacturer); |
| 652 | if (eeprom->product != NULL) |
| 653 | product_size = strlen(eeprom->product); |
| 654 | if (eeprom->serial != NULL) |
| 655 | serial_size = strlen(eeprom->serial); |
| 656 | |
| 657 | size_check = 128; // eeprom is 128 bytes |
| 658 | size_check -= 28; // 28 are always in use (fixed) |
| 659 | size_check -= manufacturer_size*2; |
| 660 | size_check -= product_size*2; |
| 661 | size_check -= serial_size*2; |
| 662 | |
| 663 | // eeprom size exceeded? |
| 664 | if (size_check < 0) |
| 665 | return (-1); |
| 666 | |
| 667 | // empty eeprom |
| 668 | memset (output, 0, 128); |
| 669 | |
| 670 | // Addr 00: Stay 00 00 |
| 671 | // Addr 02: Vendor ID |
| 672 | output[0x02] = eeprom->vendor_id; |
| 673 | output[0x03] = eeprom->vendor_id >> 8; |
| 674 | |
| 675 | // Addr 04: Product ID |
| 676 | output[0x04] = eeprom->product_id; |
| 677 | output[0x05] = eeprom->product_id >> 8; |
| 678 | |
| 679 | // Addr 06: Device release number (0400h for BM features) |
| 680 | output[0x06] = 0x00; |
| 681 | |
| 682 | if (eeprom->BM_type_chip == 1) |
| 683 | output[0x07] = 0x04; |
| 684 | else |
| 685 | output[0x07] = 0x02; |
| 686 | |
| 687 | // Addr 08: Config descriptor |
| 688 | // Bit 1: remote wakeup if 1 |
| 689 | // Bit 0: self powered if 1 |
| 690 | // |
| 691 | j = 0; |
| 692 | if (eeprom->self_powered == 1) |
| 693 | j = j | 1; |
| 694 | if (eeprom->remote_wakeup == 1) |
| 695 | j = j | 2; |
| 696 | output[0x08] = j; |
| 697 | |
| 698 | // Addr 09: Max power consumption: max power = value * 2 mA |
| 699 | output[0x09] = eeprom->max_power; |
| 700 | ; |
| 701 | |
| 702 | // Addr 0A: Chip configuration |
| 703 | // Bit 7: 0 - reserved |
| 704 | // Bit 6: 0 - reserved |
| 705 | // Bit 5: 0 - reserved |
| 706 | // Bit 4: 1 - Change USB version |
| 707 | // Bit 3: 1 - Use the serial number string |
| 708 | // Bit 2: 1 - Enable suspend pull downs for lower power |
| 709 | // Bit 1: 1 - Out EndPoint is Isochronous |
| 710 | // Bit 0: 1 - In EndPoint is Isochronous |
| 711 | // |
| 712 | j = 0; |
| 713 | if (eeprom->in_is_isochronous == 1) |
| 714 | j = j | 1; |
| 715 | if (eeprom->out_is_isochronous == 1) |
| 716 | j = j | 2; |
| 717 | if (eeprom->suspend_pull_downs == 1) |
| 718 | j = j | 4; |
| 719 | if (eeprom->use_serial == 1) |
| 720 | j = j | 8; |
| 721 | if (eeprom->change_usb_version == 1) |
| 722 | j = j | 16; |
| 723 | output[0x0A] = j; |
| 724 | |
| 725 | // Addr 0B: reserved |
| 726 | output[0x0B] = 0x00; |
| 727 | |
| 728 | // Addr 0C: USB version low byte when 0x0A bit 4 is set |
| 729 | // Addr 0D: USB version high byte when 0x0A bit 4 is set |
| 730 | if (eeprom->change_usb_version == 1) { |
| 731 | output[0x0C] = eeprom->usb_version; |
| 732 | output[0x0D] = eeprom->usb_version >> 8; |
| 733 | } |
| 734 | |
| 735 | |
| 736 | // Addr 0E: Offset of the manufacturer string + 0x80 |
| 737 | output[0x0E] = 0x14 + 0x80; |
| 738 | |
| 739 | // Addr 0F: Length of manufacturer string |
| 740 | output[0x0F] = manufacturer_size*2 + 2; |
| 741 | |
| 742 | // Addr 10: Offset of the product string + 0x80, calculated later |
| 743 | // Addr 11: Length of product string |
| 744 | output[0x11] = product_size*2 + 2; |
| 745 | |
| 746 | // Addr 12: Offset of the serial string + 0x80, calculated later |
| 747 | // Addr 13: Length of serial string |
| 748 | output[0x13] = serial_size*2 + 2; |
| 749 | |
| 750 | // Dynamic content |
| 751 | output[0x14] = manufacturer_size*2 + 2; |
| 752 | output[0x15] = 0x03; // type: string |
| 753 | |
| 754 | i = 0x16, j = 0; |
| 755 | |
| 756 | // Output manufacturer |
| 757 | for (j = 0; j < manufacturer_size; j++) { |
| 758 | output[i] = eeprom->manufacturer[j], i++; |
| 759 | output[i] = 0x00, i++; |
| 760 | } |
| 761 | |
| 762 | // Output product name |
| 763 | output[0x10] = i + 0x80; // calculate offset |
| 764 | output[i] = product_size*2 + 2, i++; |
| 765 | output[i] = 0x03, i++; |
| 766 | for (j = 0; j < product_size; j++) { |
| 767 | output[i] = eeprom->product[j], i++; |
| 768 | output[i] = 0x00, i++; |
| 769 | } |
| 770 | |
| 771 | // Output serial |
| 772 | output[0x12] = i + 0x80; // calculate offset |
| 773 | output[i] = serial_size*2 + 2, i++; |
| 774 | output[i] = 0x03, i++; |
| 775 | for (j = 0; j < serial_size; j++) { |
| 776 | output[i] = eeprom->serial[j], i++; |
| 777 | output[i] = 0x00, i++; |
| 778 | } |
| 779 | |
| 780 | // calculate checksum |
| 781 | checksum = 0xAAAA; |
| 782 | |
| 783 | for (i = 0; i < 63; i++) { |
| 784 | value = output[i*2]; |
| 785 | value += output[(i*2)+1] << 8; |
| 786 | |
| 787 | checksum = value^checksum; |
| 788 | checksum = (checksum << 1) | (checksum >> 15); |
| 789 | } |
| 790 | |
| 791 | output[0x7E] = checksum; |
| 792 | output[0x7F] = checksum >> 8; |
| 793 | |
| 794 | return size_check; |
| 795 | } |
| 796 | |
| 797 | |
| 798 | int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 799 | { |
| 800 | int i; |
| 801 | |
| 802 | for (i = 0; i < 64; i++) { |
| 803 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) { |
| 804 | ftdi->error_str = "Reading eeprom failed"; |
| 805 | return -1; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | return 0; |
| 810 | } |
| 811 | |
| 812 | |
| 813 | int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 814 | { |
| 815 | unsigned short usb_val; |
| 816 | int i; |
| 817 | |
| 818 | for (i = 0; i < 64; i++) { |
| 819 | usb_val = eeprom[i*2]; |
| 820 | usb_val += eeprom[(i*2)+1] << 8; |
| 821 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 822 | ftdi->error_str = "Unable to write eeprom"; |
| 823 | return -1; |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | |
| 831 | int ftdi_erase_eeprom(struct ftdi_context *ftdi) |
| 832 | { |
| 833 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 834 | ftdi->error_str = "Unable to erase eeprom"; |
| 835 | return -1; |
| 836 | } |
| 837 | |
| 838 | return 0; |
| 839 | } |