1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Garmin GPS driver 4 * 5 * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de 6 * 7 * The latest version of the driver can be found at 8 * http://sourceforge.net/projects/garmin-gps/ 9 * 10 * This driver has been derived from v2.1 of the visor driver. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/timer.h> 17 #include <linux/tty.h> 18 #include <linux/tty_driver.h> 19 #include <linux/tty_flip.h> 20 #include <linux/module.h> 21 #include <linux/spinlock.h> 22 #include <linux/uaccess.h> 23 #include <linux/atomic.h> 24 #include <linux/usb.h> 25 #include <linux/usb/serial.h> 26 27 /* the mode to be set when the port ist opened */ 28 static int initial_mode = 1; 29 30 #define GARMIN_VENDOR_ID 0x091E 31 32 /* 33 * Version Information 34 */ 35 36 #define VERSION_MAJOR 0 37 #define VERSION_MINOR 36 38 39 #define _STR(s) #s 40 #define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b) 41 #define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR) 42 #define DRIVER_AUTHOR "hermann kneissel" 43 #define DRIVER_DESC "garmin gps driver" 44 45 /* error codes returned by the driver */ 46 #define EINVPKT 1000 /* invalid packet structure */ 47 48 49 /* size of the header of a packet using the usb protocol */ 50 #define GARMIN_PKTHDR_LENGTH 12 51 52 /* max. possible size of a packet using the serial protocol */ 53 #define MAX_SERIAL_PKT_SIZ (3 + 255 + 3) 54 55 /* max. possible size of a packet with worst case stuffing */ 56 #define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256) 57 58 /* size of a buffer able to hold a complete (no stuffing) packet 59 * (the document protocol does not contain packets with a larger 60 * size, but in theory a packet may be 64k+12 bytes - if in 61 * later protocol versions larger packet sizes occur, this value 62 * should be increased accordingly, so the input buffer is always 63 * large enough the store a complete packet inclusive header) */ 64 #define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ) 65 66 /* size of a buffer able to hold a complete (incl. stuffing) packet */ 67 #define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED) 68 69 /* where to place the packet id of a serial packet, so we can 70 * prepend the usb-packet header without the need to move the 71 * packets data */ 72 #define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2) 73 74 /* max. size of incoming private packets (header+1 param) */ 75 #define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4) 76 77 #define GARMIN_LAYERID_TRANSPORT 0 78 #define GARMIN_LAYERID_APPL 20 79 /* our own layer-id to use for some control mechanisms */ 80 #define GARMIN_LAYERID_PRIVATE 0x01106E4B 81 82 #define GARMIN_PKTID_PVT_DATA 51 83 #define GARMIN_PKTID_L001_COMMAND_DATA 10 84 85 #define CMND_ABORT_TRANSFER 0 86 87 /* packet ids used in private layer */ 88 #define PRIV_PKTID_SET_DEBUG 1 89 #define PRIV_PKTID_SET_MODE 2 90 #define PRIV_PKTID_INFO_REQ 3 91 #define PRIV_PKTID_INFO_RESP 4 92 #define PRIV_PKTID_RESET_REQ 5 93 #define PRIV_PKTID_SET_DEF_MODE 6 94 95 96 #define ETX 0x03 97 #define DLE 0x10 98 #define ACK 0x06 99 #define NAK 0x15 100 101 /* structure used to queue incoming packets */ 102 struct garmin_packet { 103 struct list_head list; 104 int seq; 105 /* the real size of the data array, always > 0 */ 106 int size; 107 __u8 data[]; 108 }; 109 110 /* structure used to keep the current state of the driver */ 111 struct garmin_data { 112 __u8 state; 113 __u16 flags; 114 __u8 mode; 115 __u8 count; 116 __u8 pkt_id; 117 __u32 serial_num; 118 struct timer_list timer; 119 struct usb_serial_port *port; 120 int seq_counter; 121 int insize; 122 int outsize; 123 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */ 124 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */ 125 __u8 privpkt[4*6]; 126 spinlock_t lock; 127 struct list_head pktlist; 128 struct usb_anchor write_urbs; 129 }; 130 131 132 #define STATE_NEW 0 133 #define STATE_INITIAL_DELAY 1 134 #define STATE_TIMEOUT 2 135 #define STATE_SESSION_REQ1 3 136 #define STATE_SESSION_REQ2 4 137 #define STATE_ACTIVE 5 138 139 #define STATE_RESET 8 140 #define STATE_DISCONNECTED 9 141 #define STATE_WAIT_TTY_ACK 10 142 #define STATE_GSP_WAIT_DATA 11 143 144 #define MODE_NATIVE 0 145 #define MODE_GARMIN_SERIAL 1 146 147 /* Flags used in garmin_data.flags: */ 148 #define FLAGS_SESSION_REPLY_MASK 0x00C0 149 #define FLAGS_SESSION_REPLY1_SEEN 0x0080 150 #define FLAGS_SESSION_REPLY2_SEEN 0x0040 151 #define FLAGS_BULK_IN_ACTIVE 0x0020 152 #define FLAGS_BULK_IN_RESTART 0x0010 153 #define FLAGS_THROTTLED 0x0008 154 #define APP_REQ_SEEN 0x0004 155 #define APP_RESP_SEEN 0x0002 156 #define CLEAR_HALT_REQUIRED 0x0001 157 158 #define FLAGS_QUEUING 0x0100 159 #define FLAGS_DROP_DATA 0x0800 160 161 #define FLAGS_GSP_SKIP 0x1000 162 #define FLAGS_GSP_DLESEEN 0x2000 163 164 165 166 167 168 169 /* function prototypes */ 170 static int gsp_next_packet(struct garmin_data *garmin_data_p); 171 static int garmin_write_bulk(struct usb_serial_port *port, 172 const unsigned char *buf, int count, 173 int dismiss_ack); 174 175 /* some special packets to be send or received */ 176 static unsigned char const GARMIN_START_SESSION_REQ[] 177 = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 }; 178 static unsigned char const GARMIN_START_SESSION_REPLY[] 179 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 }; 180 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[] 181 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; 182 static unsigned char const GARMIN_STOP_TRANSFER_REQ[] 183 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 }; 184 static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[] 185 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 }; 186 187 /* packets currently unused, left as documentation */ 188 #if 0 189 static unsigned char const GARMIN_APP_LAYER_REPLY[] 190 = { 0x14, 0, 0, 0 }; 191 static unsigned char const GARMIN_START_PVT_REQ[] 192 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 }; 193 static unsigned char const GARMIN_STOP_PVT_REQ[] 194 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 }; 195 static unsigned char const PRIVATE_REQ[] 196 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 }; 197 #endif 198 199 200 static const struct usb_device_id id_table[] = { 201 /* the same device id seems to be used by all 202 usb enabled GPS devices */ 203 { USB_DEVICE(GARMIN_VENDOR_ID, 3) }, 204 { } /* Terminating entry */ 205 }; 206 MODULE_DEVICE_TABLE(usb, id_table); 207 208 209 static inline int getLayerId(const __u8 *usbPacket) 210 { 211 return __le32_to_cpup((__le32 *)(usbPacket)); 212 } 213 214 static inline int getPacketId(const __u8 *usbPacket) 215 { 216 return __le32_to_cpup((__le32 *)(usbPacket+4)); 217 } 218 219 static inline int getDataLength(const __u8 *usbPacket) 220 { 221 return __le32_to_cpup((__le32 *)(usbPacket+8)); 222 } 223 224 225 /* 226 * check if the usb-packet in buf contains an abort-transfer command. 227 * (if yes, all queued data will be dropped) 228 */ 229 static inline int isAbortTrfCmnd(const unsigned char *buf) 230 { 231 if (memcmp(buf, GARMIN_STOP_TRANSFER_REQ, 232 sizeof(GARMIN_STOP_TRANSFER_REQ)) == 0 || 233 memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2, 234 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)) == 0) 235 return 1; 236 else 237 return 0; 238 } 239 240 241 242 static void send_to_tty(struct usb_serial_port *port, 243 char *data, unsigned int actual_length) 244 { 245 if (actual_length) { 246 usb_serial_debug_data(&port->dev, __func__, actual_length, data); 247 tty_insert_flip_string(&port->port, data, actual_length); 248 tty_flip_buffer_push(&port->port); 249 } 250 } 251 252 253 /****************************************************************************** 254 * packet queue handling 255 ******************************************************************************/ 256 257 /* 258 * queue a received (usb-)packet for later processing 259 */ 260 static int pkt_add(struct garmin_data *garmin_data_p, 261 unsigned char *data, unsigned int data_length) 262 { 263 int state = 0; 264 int result = 0; 265 unsigned long flags; 266 struct garmin_packet *pkt; 267 268 /* process only packets containing data ... */ 269 if (data_length) { 270 pkt = kmalloc(sizeof(struct garmin_packet)+data_length, 271 GFP_ATOMIC); 272 if (!pkt) 273 return 0; 274 275 pkt->size = data_length; 276 memcpy(pkt->data, data, data_length); 277 278 spin_lock_irqsave(&garmin_data_p->lock, flags); 279 garmin_data_p->flags |= FLAGS_QUEUING; 280 result = list_empty(&garmin_data_p->pktlist); 281 pkt->seq = garmin_data_p->seq_counter++; 282 list_add_tail(&pkt->list, &garmin_data_p->pktlist); 283 state = garmin_data_p->state; 284 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 285 286 dev_dbg(&garmin_data_p->port->dev, 287 "%s - added: pkt: %d - %d bytes\n", __func__, 288 pkt->seq, data_length); 289 290 /* in serial mode, if someone is waiting for data from 291 the device, convert and send the next packet to tty. */ 292 if (result && (state == STATE_GSP_WAIT_DATA)) 293 gsp_next_packet(garmin_data_p); 294 } 295 return result; 296 } 297 298 299 /* get the next pending packet */ 300 static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p) 301 { 302 unsigned long flags; 303 struct garmin_packet *result = NULL; 304 305 spin_lock_irqsave(&garmin_data_p->lock, flags); 306 if (!list_empty(&garmin_data_p->pktlist)) { 307 result = (struct garmin_packet *)garmin_data_p->pktlist.next; 308 list_del(&result->list); 309 } 310 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 311 return result; 312 } 313 314 315 /* free up all queued data */ 316 static void pkt_clear(struct garmin_data *garmin_data_p) 317 { 318 unsigned long flags; 319 struct garmin_packet *result = NULL; 320 321 spin_lock_irqsave(&garmin_data_p->lock, flags); 322 while (!list_empty(&garmin_data_p->pktlist)) { 323 result = (struct garmin_packet *)garmin_data_p->pktlist.next; 324 list_del(&result->list); 325 kfree(result); 326 } 327 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 328 } 329 330 331 /****************************************************************************** 332 * garmin serial protocol handling handling 333 ******************************************************************************/ 334 335 /* send an ack packet back to the tty */ 336 static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id) 337 { 338 __u8 pkt[10]; 339 __u8 cksum = 0; 340 __u8 *ptr = pkt; 341 unsigned l = 0; 342 343 dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__, 344 pkt_id); 345 346 *ptr++ = DLE; 347 *ptr++ = ACK; 348 cksum += ACK; 349 350 *ptr++ = 2; 351 cksum += 2; 352 353 *ptr++ = pkt_id; 354 cksum += pkt_id; 355 356 if (pkt_id == DLE) 357 *ptr++ = DLE; 358 359 *ptr++ = 0; 360 *ptr++ = (-cksum) & 0xFF; 361 *ptr++ = DLE; 362 *ptr++ = ETX; 363 364 l = ptr-pkt; 365 366 send_to_tty(garmin_data_p->port, pkt, l); 367 return 0; 368 } 369 370 371 372 /* 373 * called for a complete packet received from tty layer 374 * 375 * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting 376 * at GSP_INITIAL_OFFSET. 377 * 378 * count - number of bytes in the input buffer including space reserved for 379 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet 380 * (including pkt-id, data-length a. cksum) 381 */ 382 static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count) 383 { 384 struct device *dev = &garmin_data_p->port->dev; 385 unsigned long flags; 386 const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET; 387 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer; 388 int cksum = 0; 389 int n = 0; 390 int pktid = recpkt[0]; 391 int size = recpkt[1]; 392 393 usb_serial_debug_data(&garmin_data_p->port->dev, __func__, 394 count-GSP_INITIAL_OFFSET, recpkt); 395 396 if (size != (count-GSP_INITIAL_OFFSET-3)) { 397 dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n", 398 __func__, size, (count-GSP_INITIAL_OFFSET-3)); 399 return -EINVPKT; 400 } 401 402 cksum += *recpkt++; 403 cksum += *recpkt++; 404 405 /* sanity check, remove after test ... */ 406 if ((__u8 *)&(usbdata[3]) != recpkt) { 407 dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__, 408 &(usbdata[4]), recpkt); 409 return -EINVPKT; 410 } 411 412 while (n < size) { 413 cksum += *recpkt++; 414 n++; 415 } 416 417 if (((cksum + *recpkt) & 0xff) != 0) { 418 dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n", 419 __func__, -cksum & 0xff, *recpkt); 420 return -EINVPKT; 421 } 422 423 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL); 424 usbdata[1] = __cpu_to_le32(pktid); 425 usbdata[2] = __cpu_to_le32(size); 426 427 garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer, 428 GARMIN_PKTHDR_LENGTH+size, 0); 429 430 /* if this was an abort-transfer command, flush all 431 queued data. */ 432 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) { 433 spin_lock_irqsave(&garmin_data_p->lock, flags); 434 garmin_data_p->flags |= FLAGS_DROP_DATA; 435 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 436 pkt_clear(garmin_data_p); 437 } 438 439 return count; 440 } 441 442 443 444 /* 445 * Called for data received from tty 446 * 447 * buf contains the data read, it may span more than one packet or even 448 * incomplete packets 449 * 450 * input record should be a serial-record, but it may not be complete. 451 * Copy it into our local buffer, until an etx is seen (or an error 452 * occurs). 453 * Once the record is complete, convert into a usb packet and send it 454 * to the bulk pipe, send an ack back to the tty. 455 * 456 * If the input is an ack, just send the last queued packet to the 457 * tty layer. 458 * 459 * if the input is an abort command, drop all queued data. 460 */ 461 462 static int gsp_receive(struct garmin_data *garmin_data_p, 463 const unsigned char *buf, int count) 464 { 465 struct device *dev = &garmin_data_p->port->dev; 466 unsigned long flags; 467 int offs = 0; 468 int ack_or_nak_seen = 0; 469 __u8 *dest; 470 int size; 471 /* dleSeen: set if last byte read was a DLE */ 472 int dleSeen; 473 /* skip: if set, skip incoming data until possible start of 474 * new packet 475 */ 476 int skip; 477 __u8 data; 478 479 spin_lock_irqsave(&garmin_data_p->lock, flags); 480 dest = garmin_data_p->inbuffer; 481 size = garmin_data_p->insize; 482 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN; 483 skip = garmin_data_p->flags & FLAGS_GSP_SKIP; 484 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 485 486 /* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n", 487 __func__, dleSeen, skip, size, count); */ 488 489 if (size == 0) 490 size = GSP_INITIAL_OFFSET; 491 492 while (offs < count) { 493 494 data = *(buf+offs); 495 offs++; 496 497 if (data == DLE) { 498 if (skip) { /* start of a new pkt */ 499 skip = 0; 500 size = GSP_INITIAL_OFFSET; 501 dleSeen = 1; 502 } else if (dleSeen) { 503 dest[size++] = data; 504 dleSeen = 0; 505 } else { 506 dleSeen = 1; 507 } 508 } else if (data == ETX) { 509 if (dleSeen) { 510 /* packet complete */ 511 512 data = dest[GSP_INITIAL_OFFSET]; 513 514 if (data == ACK) { 515 ack_or_nak_seen = ACK; 516 dev_dbg(dev, "ACK packet complete.\n"); 517 } else if (data == NAK) { 518 ack_or_nak_seen = NAK; 519 dev_dbg(dev, "NAK packet complete.\n"); 520 } else { 521 dev_dbg(dev, "packet complete - id=0x%X.\n", 522 data); 523 gsp_rec_packet(garmin_data_p, size); 524 } 525 526 skip = 1; 527 size = GSP_INITIAL_OFFSET; 528 dleSeen = 0; 529 } else { 530 dest[size++] = data; 531 } 532 } else if (!skip) { 533 534 if (dleSeen) { 535 size = GSP_INITIAL_OFFSET; 536 dleSeen = 0; 537 } 538 539 dest[size++] = data; 540 } 541 542 if (size >= GPS_IN_BUFSIZ) { 543 dev_dbg(dev, "%s - packet too large.\n", __func__); 544 skip = 1; 545 size = GSP_INITIAL_OFFSET; 546 dleSeen = 0; 547 } 548 } 549 550 spin_lock_irqsave(&garmin_data_p->lock, flags); 551 552 garmin_data_p->insize = size; 553 554 /* copy flags back to structure */ 555 if (skip) 556 garmin_data_p->flags |= FLAGS_GSP_SKIP; 557 else 558 garmin_data_p->flags &= ~FLAGS_GSP_SKIP; 559 560 if (dleSeen) 561 garmin_data_p->flags |= FLAGS_GSP_DLESEEN; 562 else 563 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN; 564 565 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 566 567 if (ack_or_nak_seen) { 568 if (gsp_next_packet(garmin_data_p) > 0) 569 garmin_data_p->state = STATE_ACTIVE; 570 else 571 garmin_data_p->state = STATE_GSP_WAIT_DATA; 572 } 573 return count; 574 } 575 576 577 578 /* 579 * Sends a usb packet to the tty 580 * 581 * Assumes, that all packages and at an usb-packet boundary. 582 * 583 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent 584 */ 585 static int gsp_send(struct garmin_data *garmin_data_p, 586 const unsigned char *buf, int count) 587 { 588 struct device *dev = &garmin_data_p->port->dev; 589 const unsigned char *src; 590 unsigned char *dst; 591 int pktid = 0; 592 int datalen = 0; 593 int cksum = 0; 594 int i = 0; 595 int k; 596 597 dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__, 598 garmin_data_p->state, count); 599 600 k = garmin_data_p->outsize; 601 if ((k+count) > GPS_OUT_BUFSIZ) { 602 dev_dbg(dev, "packet too large\n"); 603 garmin_data_p->outsize = 0; 604 return -4; 605 } 606 607 memcpy(garmin_data_p->outbuffer+k, buf, count); 608 k += count; 609 garmin_data_p->outsize = k; 610 611 if (k >= GARMIN_PKTHDR_LENGTH) { 612 pktid = getPacketId(garmin_data_p->outbuffer); 613 datalen = getDataLength(garmin_data_p->outbuffer); 614 i = GARMIN_PKTHDR_LENGTH + datalen; 615 if (k < i) 616 return 0; 617 } else { 618 return 0; 619 } 620 621 dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i); 622 623 /* garmin_data_p->outbuffer now contains a complete packet */ 624 625 usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k, 626 garmin_data_p->outbuffer); 627 628 garmin_data_p->outsize = 0; 629 630 if (getLayerId(garmin_data_p->outbuffer) != GARMIN_LAYERID_APPL) { 631 dev_dbg(dev, "not an application packet (%d)\n", 632 getLayerId(garmin_data_p->outbuffer)); 633 return -1; 634 } 635 636 if (pktid > 255) { 637 dev_dbg(dev, "packet-id %d too large\n", pktid); 638 return -2; 639 } 640 641 if (datalen > 255) { 642 dev_dbg(dev, "packet-size %d too large\n", datalen); 643 return -3; 644 } 645 646 /* the serial protocol should be able to handle this packet */ 647 648 k = 0; 649 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH; 650 for (i = 0; i < datalen; i++) { 651 if (*src++ == DLE) 652 k++; 653 } 654 655 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH; 656 if (k > (GARMIN_PKTHDR_LENGTH-2)) { 657 /* can't add stuffing DLEs in place, move data to end 658 of buffer ... */ 659 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen; 660 memcpy(dst, src, datalen); 661 src = dst; 662 } 663 664 dst = garmin_data_p->outbuffer; 665 666 *dst++ = DLE; 667 *dst++ = pktid; 668 cksum += pktid; 669 *dst++ = datalen; 670 cksum += datalen; 671 if (datalen == DLE) 672 *dst++ = DLE; 673 674 for (i = 0; i < datalen; i++) { 675 __u8 c = *src++; 676 *dst++ = c; 677 cksum += c; 678 if (c == DLE) 679 *dst++ = DLE; 680 } 681 682 cksum = -cksum & 0xFF; 683 *dst++ = cksum; 684 if (cksum == DLE) 685 *dst++ = DLE; 686 *dst++ = DLE; 687 *dst++ = ETX; 688 689 i = dst-garmin_data_p->outbuffer; 690 691 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i); 692 693 garmin_data_p->pkt_id = pktid; 694 garmin_data_p->state = STATE_WAIT_TTY_ACK; 695 696 return i; 697 } 698 699 700 /* 701 * Process the next pending data packet - if there is one 702 */ 703 static int gsp_next_packet(struct garmin_data *garmin_data_p) 704 { 705 int result = 0; 706 struct garmin_packet *pkt = NULL; 707 708 while ((pkt = pkt_pop(garmin_data_p)) != NULL) { 709 dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq); 710 result = gsp_send(garmin_data_p, pkt->data, pkt->size); 711 if (result > 0) { 712 kfree(pkt); 713 return result; 714 } 715 kfree(pkt); 716 } 717 return result; 718 } 719 720 721 722 /****************************************************************************** 723 * garmin native mode 724 ******************************************************************************/ 725 726 727 /* 728 * Called for data received from tty 729 * 730 * The input data is expected to be in garmin usb-packet format. 731 * 732 * buf contains the data read, it may span more than one packet 733 * or even incomplete packets 734 */ 735 static int nat_receive(struct garmin_data *garmin_data_p, 736 const unsigned char *buf, int count) 737 { 738 unsigned long flags; 739 __u8 *dest; 740 int offs = 0; 741 int result = count; 742 int len; 743 744 while (offs < count) { 745 /* if buffer contains header, copy rest of data */ 746 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) 747 len = GARMIN_PKTHDR_LENGTH 748 +getDataLength(garmin_data_p->inbuffer); 749 else 750 len = GARMIN_PKTHDR_LENGTH; 751 752 if (len >= GPS_IN_BUFSIZ) { 753 /* seems to be an invalid packet, ignore rest 754 of input */ 755 dev_dbg(&garmin_data_p->port->dev, 756 "%s - packet size too large: %d\n", 757 __func__, len); 758 garmin_data_p->insize = 0; 759 count = 0; 760 result = -EINVPKT; 761 } else { 762 len -= garmin_data_p->insize; 763 if (len > (count-offs)) 764 len = (count-offs); 765 if (len > 0) { 766 dest = garmin_data_p->inbuffer 767 + garmin_data_p->insize; 768 memcpy(dest, buf+offs, len); 769 garmin_data_p->insize += len; 770 offs += len; 771 } 772 } 773 774 /* do we have a complete packet ? */ 775 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) { 776 len = GARMIN_PKTHDR_LENGTH+ 777 getDataLength(garmin_data_p->inbuffer); 778 if (garmin_data_p->insize >= len) { 779 garmin_write_bulk(garmin_data_p->port, 780 garmin_data_p->inbuffer, 781 len, 0); 782 garmin_data_p->insize = 0; 783 784 /* if this was an abort-transfer command, 785 flush all queued data. */ 786 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) { 787 spin_lock_irqsave(&garmin_data_p->lock, 788 flags); 789 garmin_data_p->flags |= FLAGS_DROP_DATA; 790 spin_unlock_irqrestore( 791 &garmin_data_p->lock, flags); 792 pkt_clear(garmin_data_p); 793 } 794 } 795 } 796 } 797 return result; 798 } 799 800 801 /****************************************************************************** 802 * private packets 803 ******************************************************************************/ 804 805 static void priv_status_resp(struct usb_serial_port *port) 806 { 807 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 808 __le32 *pkt = (__le32 *)garmin_data_p->privpkt; 809 810 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE); 811 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP); 812 pkt[2] = __cpu_to_le32(12); 813 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR); 814 pkt[4] = __cpu_to_le32(garmin_data_p->mode); 815 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num); 816 817 send_to_tty(port, (__u8 *)pkt, 6 * 4); 818 } 819 820 821 /****************************************************************************** 822 * Garmin specific driver functions 823 ******************************************************************************/ 824 825 static int process_resetdev_request(struct usb_serial_port *port) 826 { 827 unsigned long flags; 828 int status; 829 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 830 831 spin_lock_irqsave(&garmin_data_p->lock, flags); 832 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED); 833 garmin_data_p->state = STATE_RESET; 834 garmin_data_p->serial_num = 0; 835 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 836 837 usb_kill_urb(port->interrupt_in_urb); 838 dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__); 839 status = usb_reset_device(port->serial->dev); 840 if (status) 841 dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n", 842 __func__, status); 843 return status; 844 } 845 846 847 848 /* 849 * clear all cached data 850 */ 851 static int garmin_clear(struct garmin_data *garmin_data_p) 852 { 853 unsigned long flags; 854 855 /* flush all queued data */ 856 pkt_clear(garmin_data_p); 857 858 spin_lock_irqsave(&garmin_data_p->lock, flags); 859 garmin_data_p->insize = 0; 860 garmin_data_p->outsize = 0; 861 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 862 863 return 0; 864 } 865 866 867 static int garmin_init_session(struct usb_serial_port *port) 868 { 869 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 870 int status; 871 int i; 872 873 usb_kill_urb(port->interrupt_in_urb); 874 875 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 876 if (status) { 877 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 878 status); 879 return status; 880 } 881 882 /* 883 * using the initialization method from gpsbabel. See comments in 884 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles() 885 */ 886 dev_dbg(&port->dev, "%s - starting session ...\n", __func__); 887 garmin_data_p->state = STATE_ACTIVE; 888 889 for (i = 0; i < 3; i++) { 890 status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ, 891 sizeof(GARMIN_START_SESSION_REQ), 0); 892 if (status < 0) 893 goto err_kill_urbs; 894 } 895 896 return 0; 897 898 err_kill_urbs: 899 usb_kill_anchored_urbs(&garmin_data_p->write_urbs); 900 usb_kill_urb(port->interrupt_in_urb); 901 902 return status; 903 } 904 905 906 907 static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port) 908 { 909 unsigned long flags; 910 int status = 0; 911 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 912 913 spin_lock_irqsave(&garmin_data_p->lock, flags); 914 garmin_data_p->mode = initial_mode; 915 garmin_data_p->count = 0; 916 garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN; 917 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 918 919 /* shutdown any bulk reads that might be going on */ 920 usb_kill_urb(port->read_urb); 921 922 if (garmin_data_p->state == STATE_RESET) 923 status = garmin_init_session(port); 924 925 garmin_data_p->state = STATE_ACTIVE; 926 return status; 927 } 928 929 930 static void garmin_close(struct usb_serial_port *port) 931 { 932 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 933 934 dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n", 935 __func__, garmin_data_p->mode, garmin_data_p->state, 936 garmin_data_p->flags); 937 938 garmin_clear(garmin_data_p); 939 940 /* shutdown our urbs */ 941 usb_kill_urb(port->read_urb); 942 usb_kill_anchored_urbs(&garmin_data_p->write_urbs); 943 944 /* keep reset state so we know that we must start a new session */ 945 if (garmin_data_p->state != STATE_RESET) 946 garmin_data_p->state = STATE_DISCONNECTED; 947 } 948 949 950 static void garmin_write_bulk_callback(struct urb *urb) 951 { 952 struct usb_serial_port *port = urb->context; 953 954 if (port) { 955 struct garmin_data *garmin_data_p = 956 usb_get_serial_port_data(port); 957 958 if (getLayerId(urb->transfer_buffer) == GARMIN_LAYERID_APPL) { 959 960 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { 961 gsp_send_ack(garmin_data_p, 962 ((__u8 *)urb->transfer_buffer)[4]); 963 } 964 } 965 usb_serial_port_softint(port); 966 } 967 968 /* Ignore errors that resulted from garmin_write_bulk with 969 dismiss_ack = 1 */ 970 971 /* free up the transfer buffer, as usb_free_urb() does not do this */ 972 kfree(urb->transfer_buffer); 973 } 974 975 976 static int garmin_write_bulk(struct usb_serial_port *port, 977 const unsigned char *buf, int count, 978 int dismiss_ack) 979 { 980 unsigned long flags; 981 struct usb_serial *serial = port->serial; 982 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 983 struct urb *urb; 984 unsigned char *buffer; 985 int status; 986 987 spin_lock_irqsave(&garmin_data_p->lock, flags); 988 garmin_data_p->flags &= ~FLAGS_DROP_DATA; 989 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 990 991 buffer = kmalloc(count, GFP_ATOMIC); 992 if (!buffer) 993 return -ENOMEM; 994 995 urb = usb_alloc_urb(0, GFP_ATOMIC); 996 if (!urb) { 997 kfree(buffer); 998 return -ENOMEM; 999 } 1000 1001 memcpy(buffer, buf, count); 1002 1003 usb_serial_debug_data(&port->dev, __func__, count, buffer); 1004 1005 usb_fill_bulk_urb(urb, serial->dev, 1006 usb_sndbulkpipe(serial->dev, 1007 port->bulk_out_endpointAddress), 1008 buffer, count, 1009 garmin_write_bulk_callback, 1010 dismiss_ack ? NULL : port); 1011 urb->transfer_flags |= URB_ZERO_PACKET; 1012 1013 if (getLayerId(buffer) == GARMIN_LAYERID_APPL) { 1014 1015 spin_lock_irqsave(&garmin_data_p->lock, flags); 1016 garmin_data_p->flags |= APP_REQ_SEEN; 1017 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1018 1019 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { 1020 pkt_clear(garmin_data_p); 1021 garmin_data_p->state = STATE_GSP_WAIT_DATA; 1022 } 1023 } 1024 1025 /* send it down the pipe */ 1026 usb_anchor_urb(urb, &garmin_data_p->write_urbs); 1027 status = usb_submit_urb(urb, GFP_ATOMIC); 1028 if (status) { 1029 dev_err(&port->dev, 1030 "%s - usb_submit_urb(write bulk) failed with status = %d\n", 1031 __func__, status); 1032 count = status; 1033 usb_unanchor_urb(urb); 1034 kfree(buffer); 1035 } 1036 1037 /* we are done with this urb, so let the host driver 1038 * really free it when it is finished with it */ 1039 usb_free_urb(urb); 1040 1041 return count; 1042 } 1043 1044 static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port, 1045 const unsigned char *buf, int count) 1046 { 1047 struct device *dev = &port->dev; 1048 int pktid, pktsiz, len; 1049 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1050 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt; 1051 1052 usb_serial_debug_data(dev, __func__, count, buf); 1053 1054 if (garmin_data_p->state == STATE_RESET) 1055 return -EIO; 1056 1057 /* check for our private packets */ 1058 if (count >= GARMIN_PKTHDR_LENGTH) { 1059 len = PRIVPKTSIZ; 1060 if (count < len) 1061 len = count; 1062 1063 memcpy(garmin_data_p->privpkt, buf, len); 1064 1065 pktsiz = getDataLength(garmin_data_p->privpkt); 1066 pktid = getPacketId(garmin_data_p->privpkt); 1067 1068 if (count == (GARMIN_PKTHDR_LENGTH + pktsiz) && 1069 getLayerId(garmin_data_p->privpkt) == 1070 GARMIN_LAYERID_PRIVATE) { 1071 1072 dev_dbg(dev, "%s - processing private request %d\n", 1073 __func__, pktid); 1074 1075 /* drop all unfinished transfers */ 1076 garmin_clear(garmin_data_p); 1077 1078 switch (pktid) { 1079 case PRIV_PKTID_SET_MODE: 1080 if (pktsiz != 4) 1081 return -EINVPKT; 1082 garmin_data_p->mode = __le32_to_cpu(privpkt[3]); 1083 dev_dbg(dev, "%s - mode set to %d\n", 1084 __func__, garmin_data_p->mode); 1085 break; 1086 1087 case PRIV_PKTID_INFO_REQ: 1088 priv_status_resp(port); 1089 break; 1090 1091 case PRIV_PKTID_RESET_REQ: 1092 process_resetdev_request(port); 1093 break; 1094 1095 case PRIV_PKTID_SET_DEF_MODE: 1096 if (pktsiz != 4) 1097 return -EINVPKT; 1098 initial_mode = __le32_to_cpu(privpkt[3]); 1099 dev_dbg(dev, "%s - initial_mode set to %d\n", 1100 __func__, 1101 garmin_data_p->mode); 1102 break; 1103 } 1104 return count; 1105 } 1106 } 1107 1108 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { 1109 return gsp_receive(garmin_data_p, buf, count); 1110 } else { /* MODE_NATIVE */ 1111 return nat_receive(garmin_data_p, buf, count); 1112 } 1113 } 1114 1115 1116 static int garmin_write_room(struct tty_struct *tty) 1117 { 1118 struct usb_serial_port *port = tty->driver_data; 1119 /* 1120 * Report back the bytes currently available in the output buffer. 1121 */ 1122 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1123 return GPS_OUT_BUFSIZ-garmin_data_p->outsize; 1124 } 1125 1126 1127 static void garmin_read_process(struct garmin_data *garmin_data_p, 1128 unsigned char *data, unsigned data_length, 1129 int bulk_data) 1130 { 1131 unsigned long flags; 1132 1133 if (garmin_data_p->flags & FLAGS_DROP_DATA) { 1134 /* abort-transfer cmd is active */ 1135 dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__); 1136 } else if (garmin_data_p->state != STATE_DISCONNECTED && 1137 garmin_data_p->state != STATE_RESET) { 1138 1139 /* if throttling is active or postprecessing is required 1140 put the received data in the input queue, otherwise 1141 send it directly to the tty port */ 1142 if (garmin_data_p->flags & FLAGS_QUEUING) { 1143 pkt_add(garmin_data_p, data, data_length); 1144 } else if (bulk_data || (data_length >= sizeof(u32) && 1145 getLayerId(data) == GARMIN_LAYERID_APPL)) { 1146 1147 spin_lock_irqsave(&garmin_data_p->lock, flags); 1148 garmin_data_p->flags |= APP_RESP_SEEN; 1149 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1150 1151 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { 1152 pkt_add(garmin_data_p, data, data_length); 1153 } else { 1154 send_to_tty(garmin_data_p->port, data, 1155 data_length); 1156 } 1157 } 1158 /* ignore system layer packets ... */ 1159 } 1160 } 1161 1162 1163 static void garmin_read_bulk_callback(struct urb *urb) 1164 { 1165 unsigned long flags; 1166 struct usb_serial_port *port = urb->context; 1167 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1168 unsigned char *data = urb->transfer_buffer; 1169 int status = urb->status; 1170 int retval; 1171 1172 if (status) { 1173 dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n", 1174 __func__, status); 1175 return; 1176 } 1177 1178 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 1179 1180 garmin_read_process(garmin_data_p, data, urb->actual_length, 1); 1181 1182 if (urb->actual_length == 0 && 1183 (garmin_data_p->flags & FLAGS_BULK_IN_RESTART) != 0) { 1184 spin_lock_irqsave(&garmin_data_p->lock, flags); 1185 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART; 1186 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1187 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1188 if (retval) 1189 dev_err(&port->dev, 1190 "%s - failed resubmitting read urb, error %d\n", 1191 __func__, retval); 1192 } else if (urb->actual_length > 0) { 1193 /* Continue trying to read until nothing more is received */ 1194 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) { 1195 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1196 if (retval) 1197 dev_err(&port->dev, 1198 "%s - failed resubmitting read urb, error %d\n", 1199 __func__, retval); 1200 } 1201 } else { 1202 dev_dbg(&port->dev, "%s - end of bulk data\n", __func__); 1203 spin_lock_irqsave(&garmin_data_p->lock, flags); 1204 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE; 1205 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1206 } 1207 } 1208 1209 1210 static void garmin_read_int_callback(struct urb *urb) 1211 { 1212 unsigned long flags; 1213 int retval; 1214 struct usb_serial_port *port = urb->context; 1215 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1216 unsigned char *data = urb->transfer_buffer; 1217 int status = urb->status; 1218 1219 switch (status) { 1220 case 0: 1221 /* success */ 1222 break; 1223 case -ECONNRESET: 1224 case -ENOENT: 1225 case -ESHUTDOWN: 1226 /* this urb is terminated, clean up */ 1227 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", 1228 __func__, status); 1229 return; 1230 default: 1231 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", 1232 __func__, status); 1233 return; 1234 } 1235 1236 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, 1237 urb->transfer_buffer); 1238 1239 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) && 1240 memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY, 1241 sizeof(GARMIN_BULK_IN_AVAIL_REPLY)) == 0) { 1242 1243 dev_dbg(&port->dev, "%s - bulk data available.\n", __func__); 1244 1245 if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) == 0) { 1246 1247 /* bulk data available */ 1248 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); 1249 if (retval) { 1250 dev_err(&port->dev, 1251 "%s - failed submitting read urb, error %d\n", 1252 __func__, retval); 1253 } else { 1254 spin_lock_irqsave(&garmin_data_p->lock, flags); 1255 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE; 1256 spin_unlock_irqrestore(&garmin_data_p->lock, 1257 flags); 1258 } 1259 } else { 1260 /* bulk-in transfer still active */ 1261 spin_lock_irqsave(&garmin_data_p->lock, flags); 1262 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART; 1263 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1264 } 1265 1266 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY)) 1267 && memcmp(data, GARMIN_START_SESSION_REPLY, 1268 sizeof(GARMIN_START_SESSION_REPLY)) == 0) { 1269 1270 spin_lock_irqsave(&garmin_data_p->lock, flags); 1271 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN; 1272 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1273 1274 /* save the serial number */ 1275 garmin_data_p->serial_num = __le32_to_cpup( 1276 (__le32 *)(data+GARMIN_PKTHDR_LENGTH)); 1277 1278 dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n", 1279 __func__, garmin_data_p->serial_num); 1280 } 1281 1282 garmin_read_process(garmin_data_p, data, urb->actual_length, 0); 1283 1284 retval = usb_submit_urb(urb, GFP_ATOMIC); 1285 if (retval) 1286 dev_err(&urb->dev->dev, 1287 "%s - Error %d submitting interrupt urb\n", 1288 __func__, retval); 1289 } 1290 1291 1292 /* 1293 * Sends the next queued packt to the tty port (garmin native mode only) 1294 * and then sets a timer to call itself again until all queued data 1295 * is sent. 1296 */ 1297 static int garmin_flush_queue(struct garmin_data *garmin_data_p) 1298 { 1299 unsigned long flags; 1300 struct garmin_packet *pkt; 1301 1302 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) { 1303 pkt = pkt_pop(garmin_data_p); 1304 if (pkt != NULL) { 1305 send_to_tty(garmin_data_p->port, pkt->data, pkt->size); 1306 kfree(pkt); 1307 mod_timer(&garmin_data_p->timer, (1)+jiffies); 1308 1309 } else { 1310 spin_lock_irqsave(&garmin_data_p->lock, flags); 1311 garmin_data_p->flags &= ~FLAGS_QUEUING; 1312 spin_unlock_irqrestore(&garmin_data_p->lock, flags); 1313 } 1314 } 1315 return 0; 1316 } 1317 1318 1319 static void garmin_throttle(struct tty_struct *tty) 1320 { 1321 struct usb_serial_port *port = tty->driver_data; 1322 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1323 1324 /* set flag, data received will be put into a queue 1325 for later processing */ 1326 spin_lock_irq(&garmin_data_p->lock); 1327 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED; 1328 spin_unlock_irq(&garmin_data_p->lock); 1329 } 1330 1331 1332 static void garmin_unthrottle(struct tty_struct *tty) 1333 { 1334 struct usb_serial_port *port = tty->driver_data; 1335 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1336 int status; 1337 1338 spin_lock_irq(&garmin_data_p->lock); 1339 garmin_data_p->flags &= ~FLAGS_THROTTLED; 1340 spin_unlock_irq(&garmin_data_p->lock); 1341 1342 /* in native mode send queued data to tty, in 1343 serial mode nothing needs to be done here */ 1344 if (garmin_data_p->mode == MODE_NATIVE) 1345 garmin_flush_queue(garmin_data_p); 1346 1347 if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) != 0) { 1348 status = usb_submit_urb(port->read_urb, GFP_KERNEL); 1349 if (status) 1350 dev_err(&port->dev, 1351 "%s - failed resubmitting read urb, error %d\n", 1352 __func__, status); 1353 } 1354 } 1355 1356 /* 1357 * The timer is currently only used to send queued packets to 1358 * the tty in cases where the protocol provides no own handshaking 1359 * to initiate the transfer. 1360 */ 1361 static void timeout_handler(struct timer_list *t) 1362 { 1363 struct garmin_data *garmin_data_p = from_timer(garmin_data_p, t, timer); 1364 1365 /* send the next queued packet to the tty port */ 1366 if (garmin_data_p->mode == MODE_NATIVE) 1367 if (garmin_data_p->flags & FLAGS_QUEUING) 1368 garmin_flush_queue(garmin_data_p); 1369 } 1370 1371 1372 1373 static int garmin_port_probe(struct usb_serial_port *port) 1374 { 1375 int status; 1376 struct garmin_data *garmin_data_p; 1377 1378 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL); 1379 if (!garmin_data_p) 1380 return -ENOMEM; 1381 1382 timer_setup(&garmin_data_p->timer, timeout_handler, 0); 1383 spin_lock_init(&garmin_data_p->lock); 1384 INIT_LIST_HEAD(&garmin_data_p->pktlist); 1385 garmin_data_p->port = port; 1386 garmin_data_p->state = 0; 1387 garmin_data_p->flags = 0; 1388 garmin_data_p->count = 0; 1389 init_usb_anchor(&garmin_data_p->write_urbs); 1390 usb_set_serial_port_data(port, garmin_data_p); 1391 1392 status = garmin_init_session(port); 1393 if (status) 1394 goto err_free; 1395 1396 return 0; 1397 err_free: 1398 kfree(garmin_data_p); 1399 1400 return status; 1401 } 1402 1403 1404 static int garmin_port_remove(struct usb_serial_port *port) 1405 { 1406 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); 1407 1408 usb_kill_anchored_urbs(&garmin_data_p->write_urbs); 1409 usb_kill_urb(port->interrupt_in_urb); 1410 del_timer_sync(&garmin_data_p->timer); 1411 kfree(garmin_data_p); 1412 return 0; 1413 } 1414 1415 1416 /* All of the device info needed */ 1417 static struct usb_serial_driver garmin_device = { 1418 .driver = { 1419 .owner = THIS_MODULE, 1420 .name = "garmin_gps", 1421 }, 1422 .description = "Garmin GPS usb/tty", 1423 .id_table = id_table, 1424 .num_ports = 1, 1425 .open = garmin_open, 1426 .close = garmin_close, 1427 .throttle = garmin_throttle, 1428 .unthrottle = garmin_unthrottle, 1429 .port_probe = garmin_port_probe, 1430 .port_remove = garmin_port_remove, 1431 .write = garmin_write, 1432 .write_room = garmin_write_room, 1433 .write_bulk_callback = garmin_write_bulk_callback, 1434 .read_bulk_callback = garmin_read_bulk_callback, 1435 .read_int_callback = garmin_read_int_callback, 1436 }; 1437 1438 static struct usb_serial_driver * const serial_drivers[] = { 1439 &garmin_device, NULL 1440 }; 1441 1442 module_usb_serial_driver(serial_drivers, id_table); 1443 1444 MODULE_AUTHOR(DRIVER_AUTHOR); 1445 MODULE_DESCRIPTION(DRIVER_DESC); 1446 MODULE_LICENSE("GPL"); 1447 1448 module_param(initial_mode, int, S_IRUGO); 1449 MODULE_PARM_DESC(initial_mode, "Initial mode"); 1450