| 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 | |
| 19 | #include "ftdi.h" |
| 20 | |
| 21 | /* ftdi_init return codes: |
| 22 | 0: all fine |
| 23 | -1: couldn't allocate read buffer |
| 24 | */ |
| 25 | int ftdi_init(struct ftdi_context *ftdi) { |
| 26 | ftdi->usb_dev = NULL; |
| 27 | ftdi->usb_read_timeout = 5000; |
| 28 | ftdi->usb_write_timeout = 5000; |
| 29 | |
| 30 | ftdi->type = TYPE_BM; /* chip type */ |
| 31 | ftdi->baudrate = -1; |
| 32 | ftdi->bitbang_enabled = 0; |
| 33 | |
| 34 | ftdi->readbuffer = NULL; |
| 35 | ftdi->readbuffer_offset = 0; |
| 36 | ftdi->readbuffer_remaining = 0; |
| 37 | ftdi->writebuffer_chunksize = 4096; |
| 38 | |
| 39 | ftdi->interface = 0; |
| 40 | ftdi->index = 0; |
| 41 | ftdi->in_ep = 0x02; |
| 42 | ftdi->out_ep = 0x81; |
| 43 | ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */ |
| 44 | |
| 45 | ftdi->error_str = NULL; |
| 46 | |
| 47 | // all fine. Now allocate the readbuffer |
| 48 | return ftdi_read_data_set_chunksize(ftdi, 4096); |
| 49 | } |
| 50 | |
| 51 | |
| 52 | void ftdi_deinit(struct ftdi_context *ftdi) { |
| 53 | if (ftdi->readbuffer != NULL) { |
| 54 | free(ftdi->readbuffer); |
| 55 | ftdi->readbuffer = NULL; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | |
| 60 | void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb) { |
| 61 | ftdi->usb_dev = usb; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | /* ftdi_usb_open return codes: |
| 66 | 0: all fine |
| 67 | -1: usb_find_busses() failed |
| 68 | -2: usb_find_devices() failed |
| 69 | -3: usb device not found |
| 70 | -4: unable to open device |
| 71 | -5: unable to claim device |
| 72 | -6: reset failed |
| 73 | -7: set baudrate failed |
| 74 | */ |
| 75 | int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product) { |
| 76 | struct usb_bus *bus; |
| 77 | struct usb_device *dev; |
| 78 | |
| 79 | usb_init(); |
| 80 | |
| 81 | if (usb_find_busses() < 0) { |
| 82 | ftdi->error_str = "usb_find_busses() failed"; |
| 83 | return -1; |
| 84 | } |
| 85 | |
| 86 | if (usb_find_devices() < 0) { |
| 87 | ftdi->error_str = "usb_find_devices() failed"; |
| 88 | return -2; |
| 89 | } |
| 90 | |
| 91 | for (bus = usb_busses; bus; bus = bus->next) { |
| 92 | for (dev = bus->devices; dev; dev = dev->next) { |
| 93 | if (dev->descriptor.idVendor == vendor && dev->descriptor.idProduct == product) { |
| 94 | ftdi->usb_dev = usb_open(dev); |
| 95 | if (ftdi->usb_dev) { |
| 96 | if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) { |
| 97 | ftdi->error_str = "unable to claim usb device. Make sure ftdi_sio is unloaded!"; |
| 98 | return -5; |
| 99 | } |
| 100 | |
| 101 | if (ftdi_usb_reset (ftdi) != 0) |
| 102 | return -6; |
| 103 | |
| 104 | if (ftdi_set_baudrate (ftdi, 9600) != 0) |
| 105 | return -7; |
| 106 | |
| 107 | return 0; |
| 108 | } else { |
| 109 | ftdi->error_str = "usb_open() failed"; |
| 110 | return -4; |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | } |
| 116 | |
| 117 | // device not found |
| 118 | return -3; |
| 119 | } |
| 120 | |
| 121 | |
| 122 | int ftdi_usb_reset(struct ftdi_context *ftdi) { |
| 123 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 124 | ftdi->error_str = "FTDI reset failed"; |
| 125 | return -1; |
| 126 | } |
| 127 | // Invalidate data in the readbuffer |
| 128 | ftdi->readbuffer_offset = 0; |
| 129 | ftdi->readbuffer_remaining = 0; |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | int ftdi_usb_purge_buffers(struct ftdi_context *ftdi) { |
| 135 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 136 | ftdi->error_str = "FTDI purge of RX buffer failed"; |
| 137 | return -1; |
| 138 | } |
| 139 | // Invalidate data in the readbuffer |
| 140 | ftdi->readbuffer_offset = 0; |
| 141 | ftdi->readbuffer_remaining = 0; |
| 142 | |
| 143 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 144 | ftdi->error_str = "FTDI purge of TX buffer failed"; |
| 145 | return -1; |
| 146 | } |
| 147 | |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* ftdi_usb_close return codes |
| 153 | 0: all fine |
| 154 | -1: usb_release failed |
| 155 | -2: usb_close failed |
| 156 | */ |
| 157 | int ftdi_usb_close(struct ftdi_context *ftdi) { |
| 158 | int rtn = 0; |
| 159 | |
| 160 | if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0) |
| 161 | rtn = -1; |
| 162 | |
| 163 | if (usb_close (ftdi->usb_dev) != 0) |
| 164 | rtn = -2; |
| 165 | |
| 166 | return rtn; |
| 167 | } |
| 168 | |
| 169 | |
| 170 | /* |
| 171 | ftdi_convert_baudrate returns nearest supported baud rate to that requested. |
| 172 | Function is only used internally |
| 173 | */ |
| 174 | static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi, |
| 175 | unsigned short *value, unsigned short *index) { |
| 176 | static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1}; |
| 177 | static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3}; |
| 178 | static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7}; |
| 179 | int divisor, best_divisor, best_baud, best_baud_diff; |
| 180 | unsigned long encoded_divisor; |
| 181 | int i; |
| 182 | |
| 183 | if (baudrate <= 0) { |
| 184 | // Return error |
| 185 | return -1; |
| 186 | } |
| 187 | |
| 188 | divisor = 24000000 / baudrate; |
| 189 | |
| 190 | if (ftdi->type == TYPE_AM) { |
| 191 | // Round down to supported fraction (AM only) |
| 192 | divisor -= am_adjust_dn[divisor & 7]; |
| 193 | } |
| 194 | |
| 195 | // Try this divisor and the one above it (because division rounds down) |
| 196 | best_divisor = 0; |
| 197 | best_baud = 0; |
| 198 | best_baud_diff = 0; |
| 199 | for (i = 0; i < 2; i++) { |
| 200 | int try_divisor = divisor + i; |
| 201 | int baud_estimate; |
| 202 | int baud_diff; |
| 203 | |
| 204 | // Round up to supported divisor value |
| 205 | if (try_divisor < 8) { |
| 206 | // Round up to minimum supported divisor |
| 207 | try_divisor = 8; |
| 208 | } else if (ftdi->type != TYPE_AM && try_divisor < 12) { |
| 209 | // BM doesn't support divisors 9 through 11 inclusive |
| 210 | try_divisor = 12; |
| 211 | } else if (divisor < 16) { |
| 212 | // AM doesn't support divisors 9 through 15 inclusive |
| 213 | try_divisor = 16; |
| 214 | } else { |
| 215 | if (ftdi->type == TYPE_AM) { |
| 216 | // Round up to supported fraction (AM only) |
| 217 | try_divisor += am_adjust_up[try_divisor & 7]; |
| 218 | if (try_divisor > 0x1FFF8) { |
| 219 | // Round down to maximum supported divisor value (for AM) |
| 220 | try_divisor = 0x1FFF8; |
| 221 | } |
| 222 | } else { |
| 223 | if (try_divisor > 0x1FFFF) { |
| 224 | // Round down to maximum supported divisor value (for BM) |
| 225 | try_divisor = 0x1FFFF; |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | // Get estimated baud rate (to nearest integer) |
| 230 | baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor; |
| 231 | // Get absolute difference from requested baud rate |
| 232 | if (baud_estimate < baudrate) { |
| 233 | baud_diff = baudrate - baud_estimate; |
| 234 | } else { |
| 235 | baud_diff = baud_estimate - baudrate; |
| 236 | } |
| 237 | if (i == 0 || baud_diff < best_baud_diff) { |
| 238 | // Closest to requested baud rate so far |
| 239 | best_divisor = try_divisor; |
| 240 | best_baud = baud_estimate; |
| 241 | best_baud_diff = baud_diff; |
| 242 | if (baud_diff == 0) { |
| 243 | // Spot on! No point trying |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | } |
| 248 | // Encode the best divisor value |
| 249 | encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14); |
| 250 | // Deal with special cases for encoded value |
| 251 | if (encoded_divisor == 1) { |
| 252 | encoded_divisor = 0; // 3000000 baud |
| 253 | } else if (encoded_divisor == 0x4001) { |
| 254 | encoded_divisor = 1; // 2000000 baud (BM only) |
| 255 | } |
| 256 | // Split into "value" and "index" values |
| 257 | *value = (unsigned short)(encoded_divisor & 0xFFFF); |
| 258 | if(ftdi->type == TYPE_FT2232C) { |
| 259 | *index = (unsigned short)(encoded_divisor >> 8); |
| 260 | *index &= 0xFF00; |
| 261 | *index |= ftdi->interface; |
| 262 | } |
| 263 | else |
| 264 | *index = (unsigned short)(encoded_divisor >> 16); |
| 265 | |
| 266 | // Return the nearest baud rate |
| 267 | return best_baud; |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | ftdi_set_baudrate return codes: |
| 272 | 0: all fine |
| 273 | -1: invalid baudrate |
| 274 | -2: setting baudrate failed |
| 275 | */ |
| 276 | int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate) { |
| 277 | unsigned short value, index; |
| 278 | int actual_baudrate; |
| 279 | |
| 280 | if (ftdi->bitbang_enabled) { |
| 281 | baudrate = baudrate*4; |
| 282 | } |
| 283 | |
| 284 | actual_baudrate = convert_baudrate(baudrate, ftdi, &value, &index); |
| 285 | if (actual_baudrate <= 0) { |
| 286 | ftdi->error_str = "Silly baudrate <= 0."; |
| 287 | return -1; |
| 288 | } |
| 289 | |
| 290 | // Check within tolerance (about 5%) |
| 291 | if ((actual_baudrate * 2 < baudrate /* Catch overflows */ ) |
| 292 | || ((actual_baudrate < baudrate) |
| 293 | ? (actual_baudrate * 21 < baudrate * 20) |
| 294 | : (baudrate * 21 < actual_baudrate * 20))) { |
| 295 | ftdi->error_str = "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4"; |
| 296 | return -1; |
| 297 | } |
| 298 | |
| 299 | if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 300 | ftdi->error_str = "Setting new baudrate failed"; |
| 301 | return -2; |
| 302 | } |
| 303 | |
| 304 | ftdi->baudrate = baudrate; |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | |
| 309 | int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size) { |
| 310 | int ret; |
| 311 | int offset = 0; |
| 312 | int total_written = 0; |
| 313 | while (offset < size) { |
| 314 | int write_size = ftdi->writebuffer_chunksize; |
| 315 | |
| 316 | if (offset+write_size > size) |
| 317 | write_size = size-offset; |
| 318 | |
| 319 | ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout); |
| 320 | if (ret == -1) { |
| 321 | ftdi->error_str = "bulk write failed"; |
| 322 | return -1; |
| 323 | } |
| 324 | total_written += ret; |
| 325 | |
| 326 | offset += write_size; |
| 327 | } |
| 328 | |
| 329 | return total_written; |
| 330 | } |
| 331 | |
| 332 | |
| 333 | int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) { |
| 334 | ftdi->writebuffer_chunksize = chunksize; |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | |
| 339 | int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) { |
| 340 | *chunksize = ftdi->writebuffer_chunksize; |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) { |
| 346 | int offset = 0, ret = 1; |
| 347 | |
| 348 | // everything we want is still in the readbuffer? |
| 349 | if (size <= ftdi->readbuffer_remaining) { |
| 350 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size); |
| 351 | |
| 352 | // Fix offsets |
| 353 | ftdi->readbuffer_remaining -= size; |
| 354 | ftdi->readbuffer_offset += size; |
| 355 | |
| 356 | /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */ |
| 357 | |
| 358 | return size; |
| 359 | } |
| 360 | // something still in the readbuffer, but not enough to satisfy 'size'? |
| 361 | if (ftdi->readbuffer_remaining != 0) { |
| 362 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining); |
| 363 | |
| 364 | // Fix offset |
| 365 | offset += ftdi->readbuffer_remaining; |
| 366 | } |
| 367 | // do the actual USB read |
| 368 | while (offset < size && ret > 0) { |
| 369 | ftdi->readbuffer_remaining = 0; |
| 370 | ftdi->readbuffer_offset = 0; |
| 371 | /* returns how much received */ |
| 372 | ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout); |
| 373 | |
| 374 | if (ret == -1) { |
| 375 | ftdi->error_str = "bulk read failed"; |
| 376 | return -1; |
| 377 | } |
| 378 | |
| 379 | if (ret > 2) { |
| 380 | // skip FTDI status bytes. |
| 381 | // Maybe stored in the future to enable modem use |
| 382 | ftdi->readbuffer_offset += 2; |
| 383 | ret -= 2; |
| 384 | } else if (ret <= 2) { |
| 385 | // no more data to read? |
| 386 | return offset; |
| 387 | } |
| 388 | if (ret > 0) { |
| 389 | // data still fits in buf? |
| 390 | if (offset+ret <= size) { |
| 391 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret); |
| 392 | //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]); |
| 393 | offset += ret; |
| 394 | |
| 395 | /* Did we read exactly the right amount of bytes? */ |
| 396 | if (offset == size) |
| 397 | return offset; |
| 398 | } else { |
| 399 | // only copy part of the data or size <= readbuffer_chunksize |
| 400 | int part_size = size-offset; |
| 401 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size); |
| 402 | |
| 403 | ftdi->readbuffer_offset += part_size; |
| 404 | ftdi->readbuffer_remaining = ret-part_size; |
| 405 | offset += part_size; |
| 406 | |
| 407 | /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n", |
| 408 | part_size, size, offset, ret, ftdi->readbuffer_remaining); */ |
| 409 | |
| 410 | return offset; |
| 411 | } |
| 412 | } |
| 413 | } |
| 414 | // never reached |
| 415 | return -2; |
| 416 | } |
| 417 | |
| 418 | |
| 419 | int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) { |
| 420 | // Invalidate all remaining data |
| 421 | ftdi->readbuffer_offset = 0; |
| 422 | ftdi->readbuffer_remaining = 0; |
| 423 | |
| 424 | unsigned char *new_buf; |
| 425 | if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) { |
| 426 | ftdi->error_str = "out of memory for readbuffer"; |
| 427 | return -1; |
| 428 | } |
| 429 | |
| 430 | ftdi->readbuffer = new_buf; |
| 431 | ftdi->readbuffer_chunksize = chunksize; |
| 432 | |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | |
| 437 | int ftdi_readt_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) { |
| 438 | *chunksize = ftdi->readbuffer_chunksize; |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | |
| 443 | |
| 444 | int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask) { |
| 445 | unsigned short usb_val; |
| 446 | |
| 447 | usb_val = bitmask; // low byte: bitmask |
| 448 | /* FT2232C: Set bitbang_mode to 2 to enable SPI */ |
| 449 | usb_val |= (ftdi->bitbang_mode << 8); |
| 450 | |
| 451 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 452 | ftdi->error_str = "Unable to enter bitbang mode. Perhaps not a BM type chip?"; |
| 453 | return -1; |
| 454 | } |
| 455 | ftdi->bitbang_enabled = 1; |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | |
| 460 | int ftdi_disable_bitbang(struct ftdi_context *ftdi) { |
| 461 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 462 | ftdi->error_str = "Unable to leave bitbang mode. Perhaps not a BM type chip?"; |
| 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | ftdi->bitbang_enabled = 0; |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins) { |
| 472 | unsigned short usb_val; |
| 473 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) { |
| 474 | ftdi->error_str = "Read pins failed"; |
| 475 | return -1; |
| 476 | } |
| 477 | |
| 478 | *pins = (unsigned char)usb_val; |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | |
| 483 | int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency) { |
| 484 | unsigned short usb_val; |
| 485 | |
| 486 | if (latency < 1) { |
| 487 | ftdi->error_str = "Latency out of range. Only valid for 1-255"; |
| 488 | return -1; |
| 489 | } |
| 490 | |
| 491 | usb_val = latency; |
| 492 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 493 | ftdi->error_str = "Unable to set latency timer"; |
| 494 | return -2; |
| 495 | } |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | |
| 500 | int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency) { |
| 501 | unsigned short usb_val; |
| 502 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) { |
| 503 | ftdi->error_str = "Reading latency timer failed"; |
| 504 | return -1; |
| 505 | } |
| 506 | |
| 507 | *latency = (unsigned char)usb_val; |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | |
| 512 | void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom) { |
| 513 | eeprom->vendor_id = 0403; |
| 514 | eeprom->product_id = 6001; |
| 515 | |
| 516 | eeprom->self_powered = 1; |
| 517 | eeprom->remote_wakeup = 1; |
| 518 | eeprom->BM_type_chip = 1; |
| 519 | |
| 520 | eeprom->in_is_isochronous = 0; |
| 521 | eeprom->out_is_isochronous = 0; |
| 522 | eeprom->suspend_pull_downs = 0; |
| 523 | |
| 524 | eeprom->use_serial = 0; |
| 525 | eeprom->change_usb_version = 0; |
| 526 | eeprom->usb_version = 200; |
| 527 | eeprom->max_power = 0; |
| 528 | |
| 529 | eeprom->manufacturer = NULL; |
| 530 | eeprom->product = NULL; |
| 531 | eeprom->serial = NULL; |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /* |
| 536 | ftdi_eeprom_build return codes: |
| 537 | positive value: used eeprom size |
| 538 | -1: eeprom size (128 bytes) exceeded by custom strings |
| 539 | */ |
| 540 | int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output) { |
| 541 | unsigned char i, j; |
| 542 | unsigned short checksum, value; |
| 543 | unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0; |
| 544 | int size_check; |
| 545 | |
| 546 | if (eeprom->manufacturer != NULL) |
| 547 | manufacturer_size = strlen(eeprom->manufacturer); |
| 548 | if (eeprom->product != NULL) |
| 549 | product_size = strlen(eeprom->product); |
| 550 | if (eeprom->serial != NULL) |
| 551 | serial_size = strlen(eeprom->serial); |
| 552 | |
| 553 | size_check = 128; // eeprom is 128 bytes |
| 554 | size_check -= 28; // 28 are always in use (fixed) |
| 555 | size_check -= manufacturer_size*2; |
| 556 | size_check -= product_size*2; |
| 557 | size_check -= serial_size*2; |
| 558 | |
| 559 | // eeprom size exceeded? |
| 560 | if (size_check < 0) |
| 561 | return (-1); |
| 562 | |
| 563 | // empty eeprom |
| 564 | memset (output, 0, 128); |
| 565 | |
| 566 | // Addr 00: Stay 00 00 |
| 567 | // Addr 02: Vendor ID |
| 568 | output[0x02] = eeprom->vendor_id; |
| 569 | output[0x03] = eeprom->vendor_id >> 8; |
| 570 | |
| 571 | // Addr 04: Product ID |
| 572 | output[0x04] = eeprom->product_id; |
| 573 | output[0x05] = eeprom->product_id >> 8; |
| 574 | |
| 575 | // Addr 06: Device release number (0400h for BM features) |
| 576 | output[0x06] = 0x00; |
| 577 | |
| 578 | if (eeprom->BM_type_chip == 1) |
| 579 | output[0x07] = 0x04; |
| 580 | else |
| 581 | output[0x07] = 0x02; |
| 582 | |
| 583 | // Addr 08: Config descriptor |
| 584 | // Bit 1: remote wakeup if 1 |
| 585 | // Bit 0: self powered if 1 |
| 586 | // |
| 587 | j = 0; |
| 588 | if (eeprom->self_powered == 1) |
| 589 | j = j | 1; |
| 590 | if (eeprom->remote_wakeup == 1) |
| 591 | j = j | 2; |
| 592 | output[0x08] = j; |
| 593 | |
| 594 | // Addr 09: Max power consumption: max power = value * 2 mA |
| 595 | output[0x09] = eeprom->max_power; |
| 596 | ; |
| 597 | |
| 598 | // Addr 0A: Chip configuration |
| 599 | // Bit 7: 0 - reserved |
| 600 | // Bit 6: 0 - reserved |
| 601 | // Bit 5: 0 - reserved |
| 602 | // Bit 4: 1 - Change USB version |
| 603 | // Bit 3: 1 - Use the serial number string |
| 604 | // Bit 2: 1 - Enable suspend pull downs for lower power |
| 605 | // Bit 1: 1 - Out EndPoint is Isochronous |
| 606 | // Bit 0: 1 - In EndPoint is Isochronous |
| 607 | // |
| 608 | j = 0; |
| 609 | if (eeprom->in_is_isochronous == 1) |
| 610 | j = j | 1; |
| 611 | if (eeprom->out_is_isochronous == 1) |
| 612 | j = j | 2; |
| 613 | if (eeprom->suspend_pull_downs == 1) |
| 614 | j = j | 4; |
| 615 | if (eeprom->use_serial == 1) |
| 616 | j = j | 8; |
| 617 | if (eeprom->change_usb_version == 1) |
| 618 | j = j | 16; |
| 619 | output[0x0A] = j; |
| 620 | |
| 621 | // Addr 0B: reserved |
| 622 | output[0x0B] = 0x00; |
| 623 | |
| 624 | // Addr 0C: USB version low byte when 0x0A bit 4 is set |
| 625 | // Addr 0D: USB version high byte when 0x0A bit 4 is set |
| 626 | if (eeprom->change_usb_version == 1) { |
| 627 | output[0x0C] = eeprom->usb_version; |
| 628 | output[0x0D] = eeprom->usb_version >> 8; |
| 629 | } |
| 630 | |
| 631 | |
| 632 | // Addr 0E: Offset of the manufacturer string + 0x80 |
| 633 | output[0x0E] = 0x14 + 0x80; |
| 634 | |
| 635 | // Addr 0F: Length of manufacturer string |
| 636 | output[0x0F] = manufacturer_size*2 + 2; |
| 637 | |
| 638 | // Addr 10: Offset of the product string + 0x80, calculated later |
| 639 | // Addr 11: Length of product string |
| 640 | output[0x11] = product_size*2 + 2; |
| 641 | |
| 642 | // Addr 12: Offset of the serial string + 0x80, calculated later |
| 643 | // Addr 13: Length of serial string |
| 644 | output[0x13] = serial_size*2 + 2; |
| 645 | |
| 646 | // Dynamic content |
| 647 | output[0x14] = manufacturer_size*2 + 2; |
| 648 | output[0x15] = 0x03; // type: string |
| 649 | |
| 650 | i = 0x16, j = 0; |
| 651 | |
| 652 | // Output manufacturer |
| 653 | for (j = 0; j < manufacturer_size; j++) { |
| 654 | output[i] = eeprom->manufacturer[j], i++; |
| 655 | output[i] = 0x00, i++; |
| 656 | } |
| 657 | |
| 658 | // Output product name |
| 659 | output[0x10] = i + 0x80; // calculate offset |
| 660 | output[i] = product_size*2 + 2, i++; |
| 661 | output[i] = 0x03, i++; |
| 662 | for (j = 0; j < product_size; j++) { |
| 663 | output[i] = eeprom->product[j], i++; |
| 664 | output[i] = 0x00, i++; |
| 665 | } |
| 666 | |
| 667 | // Output serial |
| 668 | output[0x12] = i + 0x80; // calculate offset |
| 669 | output[i] = serial_size*2 + 2, i++; |
| 670 | output[i] = 0x03, i++; |
| 671 | for (j = 0; j < serial_size; j++) { |
| 672 | output[i] = eeprom->serial[j], i++; |
| 673 | output[i] = 0x00, i++; |
| 674 | } |
| 675 | |
| 676 | // calculate checksum |
| 677 | checksum = 0xAAAA; |
| 678 | |
| 679 | for (i = 0; i < 63; i++) { |
| 680 | value = output[i*2]; |
| 681 | value += output[(i*2)+1] << 8; |
| 682 | |
| 683 | checksum = value^checksum; |
| 684 | checksum = (checksum << 1) | (checksum >> 15); |
| 685 | } |
| 686 | |
| 687 | output[0x7E] = checksum; |
| 688 | output[0x7F] = checksum >> 8; |
| 689 | |
| 690 | return size_check; |
| 691 | } |
| 692 | |
| 693 | |
| 694 | int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) { |
| 695 | int i; |
| 696 | |
| 697 | for (i = 0; i < 64; i++) { |
| 698 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) { |
| 699 | ftdi->error_str = "Reading eeprom failed"; |
| 700 | return -1; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | return 0; |
| 705 | } |
| 706 | |
| 707 | |
| 708 | int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) { |
| 709 | unsigned short usb_val; |
| 710 | int i; |
| 711 | |
| 712 | for (i = 0; i < 64; i++) { |
| 713 | usb_val = eeprom[i*2]; |
| 714 | usb_val += eeprom[(i*2)+1] << 8; |
| 715 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 716 | ftdi->error_str = "Unable to write eeprom"; |
| 717 | return -1; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | |
| 725 | int ftdi_erase_eeprom(struct ftdi_context *ftdi) { |
| 726 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) { |
| 727 | ftdi->error_str = "Unable to erase eeprom"; |
| 728 | return -1; |
| 729 | } |
| 730 | |
| 731 | return 0; |
| 732 | } |