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1/*
2 * Garmin GPS driver
3 *
4 * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de
5 *
6 * The latest version of the driver can be found at
7 * http://sourceforge.net/projects/garmin-gps/
8 *
9 * This driver has been derived from v2.1 of the visor driver.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
24 */
25
26#include <linux/kernel.h>
27#include <linux/errno.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/timer.h>
31#include <linux/tty.h>
32#include <linux/tty_driver.h>
33#include <linux/tty_flip.h>
34#include <linux/module.h>
35#include <linux/spinlock.h>
36#include <linux/uaccess.h>
37#include <linux/atomic.h>
38#include <linux/usb.h>
39#include <linux/usb/serial.h>
40
41/* the mode to be set when the port ist opened */
42static int initial_mode = 1;
43
44/* debug flag */
45static int debug;
46
47#define GARMIN_VENDOR_ID 0x091E
48
49/*
50 * Version Information
51 */
52
53#define VERSION_MAJOR 0
54#define VERSION_MINOR 36
55
56#define _STR(s) #s
57#define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b)
58#define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
59#define DRIVER_AUTHOR "hermann kneissel"
60#define DRIVER_DESC "garmin gps driver"
61
62/* error codes returned by the driver */
63#define EINVPKT 1000 /* invalid packet structure */
64
65
66/* size of the header of a packet using the usb protocol */
67#define GARMIN_PKTHDR_LENGTH 12
68
69/* max. possible size of a packet using the serial protocol */
70#define MAX_SERIAL_PKT_SIZ (3 + 255 + 3)
71
72/* max. possible size of a packet with worst case stuffing */
73#define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256)
74
75/* size of a buffer able to hold a complete (no stuffing) packet
76 * (the document protocol does not contain packets with a larger
77 * size, but in theory a packet may be 64k+12 bytes - if in
78 * later protocol versions larger packet sizes occur, this value
79 * should be increased accordingly, so the input buffer is always
80 * large enough the store a complete packet inclusive header) */
81#define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
82
83/* size of a buffer able to hold a complete (incl. stuffing) packet */
84#define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
85
86/* where to place the packet id of a serial packet, so we can
87 * prepend the usb-packet header without the need to move the
88 * packets data */
89#define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
90
91/* max. size of incoming private packets (header+1 param) */
92#define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
93
94#define GARMIN_LAYERID_TRANSPORT 0
95#define GARMIN_LAYERID_APPL 20
96/* our own layer-id to use for some control mechanisms */
97#define GARMIN_LAYERID_PRIVATE 0x01106E4B
98
99#define GARMIN_PKTID_PVT_DATA 51
100#define GARMIN_PKTID_L001_COMMAND_DATA 10
101
102#define CMND_ABORT_TRANSFER 0
103
104/* packet ids used in private layer */
105#define PRIV_PKTID_SET_DEBUG 1
106#define PRIV_PKTID_SET_MODE 2
107#define PRIV_PKTID_INFO_REQ 3
108#define PRIV_PKTID_INFO_RESP 4
109#define PRIV_PKTID_RESET_REQ 5
110#define PRIV_PKTID_SET_DEF_MODE 6
111
112
113#define ETX 0x03
114#define DLE 0x10
115#define ACK 0x06
116#define NAK 0x15
117
118/* structure used to queue incoming packets */
119struct garmin_packet {
120 struct list_head list;
121 int seq;
122 /* the real size of the data array, always > 0 */
123 int size;
124 __u8 data[1];
125};
126
127/* structure used to keep the current state of the driver */
128struct garmin_data {
129 __u8 state;
130 __u16 flags;
131 __u8 mode;
132 __u8 count;
133 __u8 pkt_id;
134 __u32 serial_num;
135 struct timer_list timer;
136 struct usb_serial_port *port;
137 int seq_counter;
138 int insize;
139 int outsize;
140 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
141 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
142 __u8 privpkt[4*6];
143 spinlock_t lock;
144 struct list_head pktlist;
145};
146
147
148#define STATE_NEW 0
149#define STATE_INITIAL_DELAY 1
150#define STATE_TIMEOUT 2
151#define STATE_SESSION_REQ1 3
152#define STATE_SESSION_REQ2 4
153#define STATE_ACTIVE 5
154
155#define STATE_RESET 8
156#define STATE_DISCONNECTED 9
157#define STATE_WAIT_TTY_ACK 10
158#define STATE_GSP_WAIT_DATA 11
159
160#define MODE_NATIVE 0
161#define MODE_GARMIN_SERIAL 1
162
163/* Flags used in garmin_data.flags: */
164#define FLAGS_SESSION_REPLY_MASK 0x00C0
165#define FLAGS_SESSION_REPLY1_SEEN 0x0080
166#define FLAGS_SESSION_REPLY2_SEEN 0x0040
167#define FLAGS_BULK_IN_ACTIVE 0x0020
168#define FLAGS_BULK_IN_RESTART 0x0010
169#define FLAGS_THROTTLED 0x0008
170#define APP_REQ_SEEN 0x0004
171#define APP_RESP_SEEN 0x0002
172#define CLEAR_HALT_REQUIRED 0x0001
173
174#define FLAGS_QUEUING 0x0100
175#define FLAGS_DROP_DATA 0x0800
176
177#define FLAGS_GSP_SKIP 0x1000
178#define FLAGS_GSP_DLESEEN 0x2000
179
180
181
182
183
184
185/* function prototypes */
186static int gsp_next_packet(struct garmin_data *garmin_data_p);
187static int garmin_write_bulk(struct usb_serial_port *port,
188 const unsigned char *buf, int count,
189 int dismiss_ack);
190
191/* some special packets to be send or received */
192static unsigned char const GARMIN_START_SESSION_REQ[]
193 = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 };
194static unsigned char const GARMIN_START_SESSION_REPLY[]
195 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
196static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
197 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
198static unsigned char const GARMIN_APP_LAYER_REPLY[]
199 = { 0x14, 0, 0, 0 };
200static unsigned char const GARMIN_START_PVT_REQ[]
201 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
202static unsigned char const GARMIN_STOP_PVT_REQ[]
203 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
204static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
205 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
206static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
207 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
208static unsigned char const PRIVATE_REQ[]
209 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
210
211
212
213static const struct usb_device_id id_table[] = {
214 /* the same device id seems to be used by all
215 usb enabled GPS devices */
216 { USB_DEVICE(GARMIN_VENDOR_ID, 3) },
217 { } /* Terminating entry */
218};
219
220MODULE_DEVICE_TABLE(usb, id_table);
221
222static struct usb_driver garmin_driver = {
223 .name = "garmin_gps",
224 .probe = usb_serial_probe,
225 .disconnect = usb_serial_disconnect,
226 .id_table = id_table,
227 .no_dynamic_id = 1,
228};
229
230
231static inline int getLayerId(const __u8 *usbPacket)
232{
233 return __le32_to_cpup((__le32 *)(usbPacket));
234}
235
236static inline int getPacketId(const __u8 *usbPacket)
237{
238 return __le32_to_cpup((__le32 *)(usbPacket+4));
239}
240
241static inline int getDataLength(const __u8 *usbPacket)
242{
243 return __le32_to_cpup((__le32 *)(usbPacket+8));
244}
245
246
247/*
248 * check if the usb-packet in buf contains an abort-transfer command.
249 * (if yes, all queued data will be dropped)
250 */
251static inline int isAbortTrfCmnd(const unsigned char *buf)
252{
253 if (0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
254 sizeof(GARMIN_STOP_TRANSFER_REQ)) ||
255 0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
256 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)))
257 return 1;
258 else
259 return 0;
260}
261
262
263
264static void send_to_tty(struct usb_serial_port *port,
265 char *data, unsigned int actual_length)
266{
267 struct tty_struct *tty = tty_port_tty_get(&port->port);
268
269 if (tty && actual_length) {
270
271 usb_serial_debug_data(debug, &port->dev,
272 __func__, actual_length, data);
273
274 tty_insert_flip_string(tty, data, actual_length);
275 tty_flip_buffer_push(tty);
276 }
277 tty_kref_put(tty);
278}
279
280
281/******************************************************************************
282 * packet queue handling
283 ******************************************************************************/
284
285/*
286 * queue a received (usb-)packet for later processing
287 */
288static int pkt_add(struct garmin_data *garmin_data_p,
289 unsigned char *data, unsigned int data_length)
290{
291 int state = 0;
292 int result = 0;
293 unsigned long flags;
294 struct garmin_packet *pkt;
295
296 /* process only packets containg data ... */
297 if (data_length) {
298 pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
299 GFP_ATOMIC);
300 if (pkt == NULL) {
301 dev_err(&garmin_data_p->port->dev, "out of memory\n");
302 return 0;
303 }
304 pkt->size = data_length;
305 memcpy(pkt->data, data, data_length);
306
307 spin_lock_irqsave(&garmin_data_p->lock, flags);
308 garmin_data_p->flags |= FLAGS_QUEUING;
309 result = list_empty(&garmin_data_p->pktlist);
310 pkt->seq = garmin_data_p->seq_counter++;
311 list_add_tail(&pkt->list, &garmin_data_p->pktlist);
312 state = garmin_data_p->state;
313 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
314
315 dbg("%s - added: pkt: %d - %d bytes",
316 __func__, pkt->seq, data_length);
317
318 /* in serial mode, if someone is waiting for data from
319 the device, convert and send the next packet to tty. */
320 if (result && (state == STATE_GSP_WAIT_DATA))
321 gsp_next_packet(garmin_data_p);
322 }
323 return result;
324}
325
326
327/* get the next pending packet */
328static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p)
329{
330 unsigned long flags;
331 struct garmin_packet *result = NULL;
332
333 spin_lock_irqsave(&garmin_data_p->lock, flags);
334 if (!list_empty(&garmin_data_p->pktlist)) {
335 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
336 list_del(&result->list);
337 }
338 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
339 return result;
340}
341
342
343/* free up all queued data */
344static void pkt_clear(struct garmin_data *garmin_data_p)
345{
346 unsigned long flags;
347 struct garmin_packet *result = NULL;
348
349 dbg("%s", __func__);
350
351 spin_lock_irqsave(&garmin_data_p->lock, flags);
352 while (!list_empty(&garmin_data_p->pktlist)) {
353 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
354 list_del(&result->list);
355 kfree(result);
356 }
357 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
358}
359
360
361/******************************************************************************
362 * garmin serial protocol handling handling
363 ******************************************************************************/
364
365/* send an ack packet back to the tty */
366static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
367{
368 __u8 pkt[10];
369 __u8 cksum = 0;
370 __u8 *ptr = pkt;
371 unsigned l = 0;
372
373 dbg("%s - pkt-id: 0x%X.", __func__, 0xFF & pkt_id);
374
375 *ptr++ = DLE;
376 *ptr++ = ACK;
377 cksum += ACK;
378
379 *ptr++ = 2;
380 cksum += 2;
381
382 *ptr++ = pkt_id;
383 cksum += pkt_id;
384
385 if (pkt_id == DLE)
386 *ptr++ = DLE;
387
388 *ptr++ = 0;
389 *ptr++ = 0xFF & (-cksum);
390 *ptr++ = DLE;
391 *ptr++ = ETX;
392
393 l = ptr-pkt;
394
395 send_to_tty(garmin_data_p->port, pkt, l);
396 return 0;
397}
398
399
400
401/*
402 * called for a complete packet received from tty layer
403 *
404 * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
405 * at GSP_INITIAL_OFFSET.
406 *
407 * count - number of bytes in the input buffer including space reserved for
408 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
409 * (including pkt-id, data-length a. cksum)
410 */
411static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
412{
413 unsigned long flags;
414 const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
415 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
416
417 int cksum = 0;
418 int n = 0;
419 int pktid = recpkt[0];
420 int size = recpkt[1];
421
422 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
423 __func__, count-GSP_INITIAL_OFFSET, recpkt);
424
425 if (size != (count-GSP_INITIAL_OFFSET-3)) {
426 dbg("%s - invalid size, expected %d bytes, got %d",
427 __func__, size, (count-GSP_INITIAL_OFFSET-3));
428 return -EINVPKT;
429 }
430
431 cksum += *recpkt++;
432 cksum += *recpkt++;
433
434 /* sanity check, remove after test ... */
435 if ((__u8 *)&(usbdata[3]) != recpkt) {
436 dbg("%s - ptr mismatch %p - %p",
437 __func__, &(usbdata[4]), recpkt);
438 return -EINVPKT;
439 }
440
441 while (n < size) {
442 cksum += *recpkt++;
443 n++;
444 }
445
446 if ((0xff & (cksum + *recpkt)) != 0) {
447 dbg("%s - invalid checksum, expected %02x, got %02x",
448 __func__, 0xff & -cksum, 0xff & *recpkt);
449 return -EINVPKT;
450 }
451
452 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
453 usbdata[1] = __cpu_to_le32(pktid);
454 usbdata[2] = __cpu_to_le32(size);
455
456 garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
457 GARMIN_PKTHDR_LENGTH+size, 0);
458
459 /* if this was an abort-transfer command, flush all
460 queued data. */
461 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
462 spin_lock_irqsave(&garmin_data_p->lock, flags);
463 garmin_data_p->flags |= FLAGS_DROP_DATA;
464 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
465 pkt_clear(garmin_data_p);
466 }
467
468 return count;
469}
470
471
472
473/*
474 * Called for data received from tty
475 *
476 * buf contains the data read, it may span more than one packet or even
477 * incomplete packets
478 *
479 * input record should be a serial-record, but it may not be complete.
480 * Copy it into our local buffer, until an etx is seen (or an error
481 * occurs).
482 * Once the record is complete, convert into a usb packet and send it
483 * to the bulk pipe, send an ack back to the tty.
484 *
485 * If the input is an ack, just send the last queued packet to the
486 * tty layer.
487 *
488 * if the input is an abort command, drop all queued data.
489 */
490
491static int gsp_receive(struct garmin_data *garmin_data_p,
492 const unsigned char *buf, int count)
493{
494 unsigned long flags;
495 int offs = 0;
496 int ack_or_nak_seen = 0;
497 __u8 *dest;
498 int size;
499 /* dleSeen: set if last byte read was a DLE */
500 int dleSeen;
501 /* skip: if set, skip incoming data until possible start of
502 * new packet
503 */
504 int skip;
505 __u8 data;
506
507 spin_lock_irqsave(&garmin_data_p->lock, flags);
508 dest = garmin_data_p->inbuffer;
509 size = garmin_data_p->insize;
510 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
511 skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
512 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
513
514 /* dbg("%s - dle=%d skip=%d size=%d count=%d",
515 __func__, dleSeen, skip, size, count); */
516
517 if (size == 0)
518 size = GSP_INITIAL_OFFSET;
519
520 while (offs < count) {
521
522 data = *(buf+offs);
523 offs++;
524
525 if (data == DLE) {
526 if (skip) { /* start of a new pkt */
527 skip = 0;
528 size = GSP_INITIAL_OFFSET;
529 dleSeen = 1;
530 } else if (dleSeen) {
531 dest[size++] = data;
532 dleSeen = 0;
533 } else {
534 dleSeen = 1;
535 }
536 } else if (data == ETX) {
537 if (dleSeen) {
538 /* packet complete */
539
540 data = dest[GSP_INITIAL_OFFSET];
541
542 if (data == ACK) {
543 ack_or_nak_seen = ACK;
544 dbg("ACK packet complete.");
545 } else if (data == NAK) {
546 ack_or_nak_seen = NAK;
547 dbg("NAK packet complete.");
548 } else {
549 dbg("packet complete - id=0x%X.",
550 0xFF & data);
551 gsp_rec_packet(garmin_data_p, size);
552 }
553
554 skip = 1;
555 size = GSP_INITIAL_OFFSET;
556 dleSeen = 0;
557 } else {
558 dest[size++] = data;
559 }
560 } else if (!skip) {
561
562 if (dleSeen) {
563 size = GSP_INITIAL_OFFSET;
564 dleSeen = 0;
565 }
566
567 dest[size++] = data;
568 }
569
570 if (size >= GPS_IN_BUFSIZ) {
571 dbg("%s - packet too large.", __func__);
572 skip = 1;
573 size = GSP_INITIAL_OFFSET;
574 dleSeen = 0;
575 }
576 }
577
578 spin_lock_irqsave(&garmin_data_p->lock, flags);
579
580 garmin_data_p->insize = size;
581
582 /* copy flags back to structure */
583 if (skip)
584 garmin_data_p->flags |= FLAGS_GSP_SKIP;
585 else
586 garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
587
588 if (dleSeen)
589 garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
590 else
591 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
592
593 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
594
595 if (ack_or_nak_seen) {
596 if (gsp_next_packet(garmin_data_p) > 0)
597 garmin_data_p->state = STATE_ACTIVE;
598 else
599 garmin_data_p->state = STATE_GSP_WAIT_DATA;
600 }
601 return count;
602}
603
604
605
606/*
607 * Sends a usb packet to the tty
608 *
609 * Assumes, that all packages and at an usb-packet boundary.
610 *
611 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
612 */
613static int gsp_send(struct garmin_data *garmin_data_p,
614 const unsigned char *buf, int count)
615{
616 const unsigned char *src;
617 unsigned char *dst;
618 int pktid = 0;
619 int datalen = 0;
620 int cksum = 0;
621 int i = 0;
622 int k;
623
624 dbg("%s - state %d - %d bytes.", __func__,
625 garmin_data_p->state, count);
626
627 k = garmin_data_p->outsize;
628 if ((k+count) > GPS_OUT_BUFSIZ) {
629 dbg("packet too large");
630 garmin_data_p->outsize = 0;
631 return -4;
632 }
633
634 memcpy(garmin_data_p->outbuffer+k, buf, count);
635 k += count;
636 garmin_data_p->outsize = k;
637
638 if (k >= GARMIN_PKTHDR_LENGTH) {
639 pktid = getPacketId(garmin_data_p->outbuffer);
640 datalen = getDataLength(garmin_data_p->outbuffer);
641 i = GARMIN_PKTHDR_LENGTH + datalen;
642 if (k < i)
643 return 0;
644 } else {
645 return 0;
646 }
647
648 dbg("%s - %d bytes in buffer, %d bytes in pkt.", __func__, k, i);
649
650 /* garmin_data_p->outbuffer now contains a complete packet */
651
652 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
653 __func__, k, garmin_data_p->outbuffer);
654
655 garmin_data_p->outsize = 0;
656
657 if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
658 dbg("not an application packet (%d)",
659 getLayerId(garmin_data_p->outbuffer));
660 return -1;
661 }
662
663 if (pktid > 255) {
664 dbg("packet-id %d too large", pktid);
665 return -2;
666 }
667
668 if (datalen > 255) {
669 dbg("packet-size %d too large", datalen);
670 return -3;
671 }
672
673 /* the serial protocol should be able to handle this packet */
674
675 k = 0;
676 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
677 for (i = 0; i < datalen; i++) {
678 if (*src++ == DLE)
679 k++;
680 }
681
682 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
683 if (k > (GARMIN_PKTHDR_LENGTH-2)) {
684 /* can't add stuffing DLEs in place, move data to end
685 of buffer ... */
686 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
687 memcpy(dst, src, datalen);
688 src = dst;
689 }
690
691 dst = garmin_data_p->outbuffer;
692
693 *dst++ = DLE;
694 *dst++ = pktid;
695 cksum += pktid;
696 *dst++ = datalen;
697 cksum += datalen;
698 if (datalen == DLE)
699 *dst++ = DLE;
700
701 for (i = 0; i < datalen; i++) {
702 __u8 c = *src++;
703 *dst++ = c;
704 cksum += c;
705 if (c == DLE)
706 *dst++ = DLE;
707 }
708
709 cksum = 0xFF & -cksum;
710 *dst++ = cksum;
711 if (cksum == DLE)
712 *dst++ = DLE;
713 *dst++ = DLE;
714 *dst++ = ETX;
715
716 i = dst-garmin_data_p->outbuffer;
717
718 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
719
720 garmin_data_p->pkt_id = pktid;
721 garmin_data_p->state = STATE_WAIT_TTY_ACK;
722
723 return i;
724}
725
726
727/*
728 * Process the next pending data packet - if there is one
729 */
730static int gsp_next_packet(struct garmin_data *garmin_data_p)
731{
732 int result = 0;
733 struct garmin_packet *pkt = NULL;
734
735 while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
736 dbg("%s - next pkt: %d", __func__, pkt->seq);
737 result = gsp_send(garmin_data_p, pkt->data, pkt->size);
738 if (result > 0) {
739 kfree(pkt);
740 return result;
741 }
742 kfree(pkt);
743 }
744 return result;
745}
746
747
748
749/******************************************************************************
750 * garmin native mode
751 ******************************************************************************/
752
753
754/*
755 * Called for data received from tty
756 *
757 * The input data is expected to be in garmin usb-packet format.
758 *
759 * buf contains the data read, it may span more than one packet
760 * or even incomplete packets
761 */
762static int nat_receive(struct garmin_data *garmin_data_p,
763 const unsigned char *buf, int count)
764{
765 unsigned long flags;
766 __u8 *dest;
767 int offs = 0;
768 int result = count;
769 int len;
770
771 while (offs < count) {
772 /* if buffer contains header, copy rest of data */
773 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
774 len = GARMIN_PKTHDR_LENGTH
775 +getDataLength(garmin_data_p->inbuffer);
776 else
777 len = GARMIN_PKTHDR_LENGTH;
778
779 if (len >= GPS_IN_BUFSIZ) {
780 /* seems to be an invalid packet, ignore rest
781 of input */
782 dbg("%s - packet size too large: %d", __func__, len);
783 garmin_data_p->insize = 0;
784 count = 0;
785 result = -EINVPKT;
786 } else {
787 len -= garmin_data_p->insize;
788 if (len > (count-offs))
789 len = (count-offs);
790 if (len > 0) {
791 dest = garmin_data_p->inbuffer
792 + garmin_data_p->insize;
793 memcpy(dest, buf+offs, len);
794 garmin_data_p->insize += len;
795 offs += len;
796 }
797 }
798
799 /* do we have a complete packet ? */
800 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
801 len = GARMIN_PKTHDR_LENGTH+
802 getDataLength(garmin_data_p->inbuffer);
803 if (garmin_data_p->insize >= len) {
804 garmin_write_bulk(garmin_data_p->port,
805 garmin_data_p->inbuffer,
806 len, 0);
807 garmin_data_p->insize = 0;
808
809 /* if this was an abort-transfer command,
810 flush all queued data. */
811 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
812 spin_lock_irqsave(&garmin_data_p->lock,
813 flags);
814 garmin_data_p->flags |= FLAGS_DROP_DATA;
815 spin_unlock_irqrestore(
816 &garmin_data_p->lock, flags);
817 pkt_clear(garmin_data_p);
818 }
819 }
820 }
821 }
822 return result;
823}
824
825
826/******************************************************************************
827 * private packets
828 ******************************************************************************/
829
830static void priv_status_resp(struct usb_serial_port *port)
831{
832 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
833 __le32 *pkt = (__le32 *)garmin_data_p->privpkt;
834
835 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
836 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
837 pkt[2] = __cpu_to_le32(12);
838 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
839 pkt[4] = __cpu_to_le32(garmin_data_p->mode);
840 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
841
842 send_to_tty(port, (__u8 *)pkt, 6 * 4);
843}
844
845
846/******************************************************************************
847 * Garmin specific driver functions
848 ******************************************************************************/
849
850static int process_resetdev_request(struct usb_serial_port *port)
851{
852 unsigned long flags;
853 int status;
854 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
855
856 spin_lock_irqsave(&garmin_data_p->lock, flags);
857 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
858 garmin_data_p->state = STATE_RESET;
859 garmin_data_p->serial_num = 0;
860 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
861
862 usb_kill_urb(port->interrupt_in_urb);
863 dbg("%s - usb_reset_device", __func__);
864 status = usb_reset_device(port->serial->dev);
865 if (status)
866 dbg("%s - usb_reset_device failed: %d",
867 __func__, status);
868 return status;
869}
870
871
872
873/*
874 * clear all cached data
875 */
876static int garmin_clear(struct garmin_data *garmin_data_p)
877{
878 unsigned long flags;
879 int status = 0;
880
881 /* flush all queued data */
882 pkt_clear(garmin_data_p);
883
884 spin_lock_irqsave(&garmin_data_p->lock, flags);
885 garmin_data_p->insize = 0;
886 garmin_data_p->outsize = 0;
887 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
888
889 return status;
890}
891
892
893static int garmin_init_session(struct usb_serial_port *port)
894{
895 struct usb_serial *serial = port->serial;
896 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
897 int status = 0;
898 int i = 0;
899
900 if (status == 0) {
901 usb_kill_urb(port->interrupt_in_urb);
902
903 dbg("%s - adding interrupt input", __func__);
904 port->interrupt_in_urb->dev = serial->dev;
905 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
906 if (status)
907 dev_err(&serial->dev->dev,
908 "%s - failed submitting interrupt urb, error %d\n",
909 __func__, status);
910 }
911
912 /*
913 * using the initialization method from gpsbabel. See comments in
914 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
915 */
916 if (status == 0) {
917 dbg("%s - starting session ...", __func__);
918 garmin_data_p->state = STATE_ACTIVE;
919
920 for (i = 0; i < 3; i++) {
921 status = garmin_write_bulk(port,
922 GARMIN_START_SESSION_REQ,
923 sizeof(GARMIN_START_SESSION_REQ), 0);
924
925 if (status < 0)
926 break;
927 }
928
929 if (status > 0)
930 status = 0;
931 }
932
933 return status;
934}
935
936
937
938static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
939{
940 unsigned long flags;
941 int status = 0;
942 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
943
944 dbg("%s - port %d", __func__, port->number);
945
946 spin_lock_irqsave(&garmin_data_p->lock, flags);
947 garmin_data_p->mode = initial_mode;
948 garmin_data_p->count = 0;
949 garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
950 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
951
952 /* shutdown any bulk reads that might be going on */
953 usb_kill_urb(port->write_urb);
954 usb_kill_urb(port->read_urb);
955
956 if (garmin_data_p->state == STATE_RESET)
957 status = garmin_init_session(port);
958
959 garmin_data_p->state = STATE_ACTIVE;
960 return status;
961}
962
963
964static void garmin_close(struct usb_serial_port *port)
965{
966 struct usb_serial *serial = port->serial;
967 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
968
969 dbg("%s - port %d - mode=%d state=%d flags=0x%X", __func__,
970 port->number, garmin_data_p->mode,
971 garmin_data_p->state, garmin_data_p->flags);
972
973 if (!serial)
974 return;
975
976 mutex_lock(&port->serial->disc_mutex);
977
978 if (!port->serial->disconnected)
979 garmin_clear(garmin_data_p);
980
981 /* shutdown our urbs */
982 usb_kill_urb(port->read_urb);
983 usb_kill_urb(port->write_urb);
984
985 /* keep reset state so we know that we must start a new session */
986 if (garmin_data_p->state != STATE_RESET)
987 garmin_data_p->state = STATE_DISCONNECTED;
988
989 mutex_unlock(&port->serial->disc_mutex);
990}
991
992
993static void garmin_write_bulk_callback(struct urb *urb)
994{
995 struct usb_serial_port *port = urb->context;
996
997 if (port) {
998 struct garmin_data *garmin_data_p =
999 usb_get_serial_port_data(port);
1000
1001 dbg("%s - port %d", __func__, port->number);
1002
1003 if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)) {
1004
1005 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1006 gsp_send_ack(garmin_data_p,
1007 ((__u8 *)urb->transfer_buffer)[4]);
1008 }
1009 }
1010 usb_serial_port_softint(port);
1011 }
1012
1013 /* Ignore errors that resulted from garmin_write_bulk with
1014 dismiss_ack = 1 */
1015
1016 /* free up the transfer buffer, as usb_free_urb() does not do this */
1017 kfree(urb->transfer_buffer);
1018}
1019
1020
1021static int garmin_write_bulk(struct usb_serial_port *port,
1022 const unsigned char *buf, int count,
1023 int dismiss_ack)
1024{
1025 unsigned long flags;
1026 struct usb_serial *serial = port->serial;
1027 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1028 struct urb *urb;
1029 unsigned char *buffer;
1030 int status;
1031
1032 dbg("%s - port %d, state %d", __func__, port->number,
1033 garmin_data_p->state);
1034
1035 spin_lock_irqsave(&garmin_data_p->lock, flags);
1036 garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1037 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1038
1039 buffer = kmalloc(count, GFP_ATOMIC);
1040 if (!buffer) {
1041 dev_err(&port->dev, "out of memory\n");
1042 return -ENOMEM;
1043 }
1044
1045 urb = usb_alloc_urb(0, GFP_ATOMIC);
1046 if (!urb) {
1047 dev_err(&port->dev, "no more free urbs\n");
1048 kfree(buffer);
1049 return -ENOMEM;
1050 }
1051
1052 memcpy(buffer, buf, count);
1053
1054 usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
1055
1056 usb_fill_bulk_urb(urb, serial->dev,
1057 usb_sndbulkpipe(serial->dev,
1058 port->bulk_out_endpointAddress),
1059 buffer, count,
1060 garmin_write_bulk_callback,
1061 dismiss_ack ? NULL : port);
1062 urb->transfer_flags |= URB_ZERO_PACKET;
1063
1064 if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
1065
1066 spin_lock_irqsave(&garmin_data_p->lock, flags);
1067 garmin_data_p->flags |= APP_REQ_SEEN;
1068 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1069
1070 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1071 pkt_clear(garmin_data_p);
1072 garmin_data_p->state = STATE_GSP_WAIT_DATA;
1073 }
1074 }
1075
1076 /* send it down the pipe */
1077 status = usb_submit_urb(urb, GFP_ATOMIC);
1078 if (status) {
1079 dev_err(&port->dev,
1080 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
1081 __func__, status);
1082 count = status;
1083 }
1084
1085 /* we are done with this urb, so let the host driver
1086 * really free it when it is finished with it */
1087 usb_free_urb(urb);
1088
1089 return count;
1090}
1091
1092static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
1093 const unsigned char *buf, int count)
1094{
1095 int pktid, pktsiz, len;
1096 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1097 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1098
1099 usb_serial_debug_data(debug, &port->dev, __func__, count, buf);
1100
1101 if (garmin_data_p->state == STATE_RESET)
1102 return -EIO;
1103
1104 /* check for our private packets */
1105 if (count >= GARMIN_PKTHDR_LENGTH) {
1106 len = PRIVPKTSIZ;
1107 if (count < len)
1108 len = count;
1109
1110 memcpy(garmin_data_p->privpkt, buf, len);
1111
1112 pktsiz = getDataLength(garmin_data_p->privpkt);
1113 pktid = getPacketId(garmin_data_p->privpkt);
1114
1115 if (count == (GARMIN_PKTHDR_LENGTH+pktsiz)
1116 && GARMIN_LAYERID_PRIVATE ==
1117 getLayerId(garmin_data_p->privpkt)) {
1118
1119 dbg("%s - processing private request %d",
1120 __func__, pktid);
1121
1122 /* drop all unfinished transfers */
1123 garmin_clear(garmin_data_p);
1124
1125 switch (pktid) {
1126
1127 case PRIV_PKTID_SET_DEBUG:
1128 if (pktsiz != 4)
1129 return -EINVPKT;
1130 debug = __le32_to_cpu(privpkt[3]);
1131 dbg("%s - debug level set to 0x%X",
1132 __func__, debug);
1133 break;
1134
1135 case PRIV_PKTID_SET_MODE:
1136 if (pktsiz != 4)
1137 return -EINVPKT;
1138 garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1139 dbg("%s - mode set to %d",
1140 __func__, garmin_data_p->mode);
1141 break;
1142
1143 case PRIV_PKTID_INFO_REQ:
1144 priv_status_resp(port);
1145 break;
1146
1147 case PRIV_PKTID_RESET_REQ:
1148 process_resetdev_request(port);
1149 break;
1150
1151 case PRIV_PKTID_SET_DEF_MODE:
1152 if (pktsiz != 4)
1153 return -EINVPKT;
1154 initial_mode = __le32_to_cpu(privpkt[3]);
1155 dbg("%s - initial_mode set to %d",
1156 __func__,
1157 garmin_data_p->mode);
1158 break;
1159 }
1160 return count;
1161 }
1162 }
1163
1164 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1165 return gsp_receive(garmin_data_p, buf, count);
1166 } else { /* MODE_NATIVE */
1167 return nat_receive(garmin_data_p, buf, count);
1168 }
1169}
1170
1171
1172static int garmin_write_room(struct tty_struct *tty)
1173{
1174 struct usb_serial_port *port = tty->driver_data;
1175 /*
1176 * Report back the bytes currently available in the output buffer.
1177 */
1178 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1179 return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1180}
1181
1182
1183static void garmin_read_process(struct garmin_data *garmin_data_p,
1184 unsigned char *data, unsigned data_length,
1185 int bulk_data)
1186{
1187 unsigned long flags;
1188
1189 if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1190 /* abort-transfer cmd is actice */
1191 dbg("%s - pkt dropped", __func__);
1192 } else if (garmin_data_p->state != STATE_DISCONNECTED &&
1193 garmin_data_p->state != STATE_RESET) {
1194
1195 /* if throttling is active or postprecessing is required
1196 put the received data in the input queue, otherwise
1197 send it directly to the tty port */
1198 if (garmin_data_p->flags & FLAGS_QUEUING) {
1199 pkt_add(garmin_data_p, data, data_length);
1200 } else if (bulk_data ||
1201 getLayerId(data) == GARMIN_LAYERID_APPL) {
1202
1203 spin_lock_irqsave(&garmin_data_p->lock, flags);
1204 garmin_data_p->flags |= APP_RESP_SEEN;
1205 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1206
1207 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1208 pkt_add(garmin_data_p, data, data_length);
1209 } else {
1210 send_to_tty(garmin_data_p->port, data,
1211 data_length);
1212 }
1213 }
1214 /* ignore system layer packets ... */
1215 }
1216}
1217
1218
1219static void garmin_read_bulk_callback(struct urb *urb)
1220{
1221 unsigned long flags;
1222 struct usb_serial_port *port = urb->context;
1223 struct usb_serial *serial = port->serial;
1224 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1225 unsigned char *data = urb->transfer_buffer;
1226 int status = urb->status;
1227 int retval;
1228
1229 dbg("%s - port %d", __func__, port->number);
1230
1231 if (!serial) {
1232 dbg("%s - bad serial pointer, exiting", __func__);
1233 return;
1234 }
1235
1236 if (status) {
1237 dbg("%s - nonzero read bulk status received: %d",
1238 __func__, status);
1239 return;
1240 }
1241
1242 usb_serial_debug_data(debug, &port->dev,
1243 __func__, urb->actual_length, data);
1244
1245 garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
1246
1247 if (urb->actual_length == 0 &&
1248 0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
1249 spin_lock_irqsave(&garmin_data_p->lock, flags);
1250 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1251 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1252 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1253 if (retval)
1254 dev_err(&port->dev,
1255 "%s - failed resubmitting read urb, error %d\n",
1256 __func__, retval);
1257 } else if (urb->actual_length > 0) {
1258 /* Continue trying to read until nothing more is received */
1259 if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
1260 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1261 if (retval)
1262 dev_err(&port->dev,
1263 "%s - failed resubmitting read urb, "
1264 "error %d\n", __func__, retval);
1265 }
1266 } else {
1267 dbg("%s - end of bulk data", __func__);
1268 spin_lock_irqsave(&garmin_data_p->lock, flags);
1269 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1270 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1271 }
1272}
1273
1274
1275static void garmin_read_int_callback(struct urb *urb)
1276{
1277 unsigned long flags;
1278 int retval;
1279 struct usb_serial_port *port = urb->context;
1280 struct usb_serial *serial = port->serial;
1281 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1282 unsigned char *data = urb->transfer_buffer;
1283 int status = urb->status;
1284
1285 switch (status) {
1286 case 0:
1287 /* success */
1288 break;
1289 case -ECONNRESET:
1290 case -ENOENT:
1291 case -ESHUTDOWN:
1292 /* this urb is terminated, clean up */
1293 dbg("%s - urb shutting down with status: %d",
1294 __func__, status);
1295 return;
1296 default:
1297 dbg("%s - nonzero urb status received: %d",
1298 __func__, status);
1299 return;
1300 }
1301
1302 usb_serial_debug_data(debug, &port->dev, __func__,
1303 urb->actual_length, urb->transfer_buffer);
1304
1305 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1306 0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1307 sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
1308
1309 dbg("%s - bulk data available.", __func__);
1310
1311 if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1312
1313 /* bulk data available */
1314 usb_fill_bulk_urb(port->read_urb, serial->dev,
1315 usb_rcvbulkpipe(serial->dev,
1316 port->bulk_in_endpointAddress),
1317 port->read_urb->transfer_buffer,
1318 port->read_urb->transfer_buffer_length,
1319 garmin_read_bulk_callback, port);
1320 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1321 if (retval) {
1322 dev_err(&port->dev,
1323 "%s - failed submitting read urb, error %d\n",
1324 __func__, retval);
1325 } else {
1326 spin_lock_irqsave(&garmin_data_p->lock, flags);
1327 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1328 spin_unlock_irqrestore(&garmin_data_p->lock,
1329 flags);
1330 }
1331 } else {
1332 /* bulk-in transfer still active */
1333 spin_lock_irqsave(&garmin_data_p->lock, flags);
1334 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1335 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1336 }
1337
1338 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1339 && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
1340 sizeof(GARMIN_START_SESSION_REPLY))) {
1341
1342 spin_lock_irqsave(&garmin_data_p->lock, flags);
1343 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1344 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1345
1346 /* save the serial number */
1347 garmin_data_p->serial_num = __le32_to_cpup(
1348 (__le32 *)(data+GARMIN_PKTHDR_LENGTH));
1349
1350 dbg("%s - start-of-session reply seen - serial %u.",
1351 __func__, garmin_data_p->serial_num);
1352 }
1353
1354 garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
1355
1356 port->interrupt_in_urb->dev = port->serial->dev;
1357 retval = usb_submit_urb(urb, GFP_ATOMIC);
1358 if (retval)
1359 dev_err(&urb->dev->dev,
1360 "%s - Error %d submitting interrupt urb\n",
1361 __func__, retval);
1362}
1363
1364
1365/*
1366 * Sends the next queued packt to the tty port (garmin native mode only)
1367 * and then sets a timer to call itself again until all queued data
1368 * is sent.
1369 */
1370static int garmin_flush_queue(struct garmin_data *garmin_data_p)
1371{
1372 unsigned long flags;
1373 struct garmin_packet *pkt;
1374
1375 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1376 pkt = pkt_pop(garmin_data_p);
1377 if (pkt != NULL) {
1378 send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1379 kfree(pkt);
1380 mod_timer(&garmin_data_p->timer, (1)+jiffies);
1381
1382 } else {
1383 spin_lock_irqsave(&garmin_data_p->lock, flags);
1384 garmin_data_p->flags &= ~FLAGS_QUEUING;
1385 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1386 }
1387 }
1388 return 0;
1389}
1390
1391
1392static void garmin_throttle(struct tty_struct *tty)
1393{
1394 struct usb_serial_port *port = tty->driver_data;
1395 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1396
1397 dbg("%s - port %d", __func__, port->number);
1398 /* set flag, data received will be put into a queue
1399 for later processing */
1400 spin_lock_irq(&garmin_data_p->lock);
1401 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1402 spin_unlock_irq(&garmin_data_p->lock);
1403}
1404
1405
1406static void garmin_unthrottle(struct tty_struct *tty)
1407{
1408 struct usb_serial_port *port = tty->driver_data;
1409 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1410 int status;
1411
1412 dbg("%s - port %d", __func__, port->number);
1413 spin_lock_irq(&garmin_data_p->lock);
1414 garmin_data_p->flags &= ~FLAGS_THROTTLED;
1415 spin_unlock_irq(&garmin_data_p->lock);
1416
1417 /* in native mode send queued data to tty, in
1418 serial mode nothing needs to be done here */
1419 if (garmin_data_p->mode == MODE_NATIVE)
1420 garmin_flush_queue(garmin_data_p);
1421
1422 if (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1423 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1424 if (status)
1425 dev_err(&port->dev,
1426 "%s - failed resubmitting read urb, error %d\n",
1427 __func__, status);
1428 }
1429}
1430
1431/*
1432 * The timer is currently only used to send queued packets to
1433 * the tty in cases where the protocol provides no own handshaking
1434 * to initiate the transfer.
1435 */
1436static void timeout_handler(unsigned long data)
1437{
1438 struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1439
1440 /* send the next queued packet to the tty port */
1441 if (garmin_data_p->mode == MODE_NATIVE)
1442 if (garmin_data_p->flags & FLAGS_QUEUING)
1443 garmin_flush_queue(garmin_data_p);
1444}
1445
1446
1447
1448static int garmin_attach(struct usb_serial *serial)
1449{
1450 int status = 0;
1451 struct usb_serial_port *port = serial->port[0];
1452 struct garmin_data *garmin_data_p = NULL;
1453
1454 dbg("%s", __func__);
1455
1456 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1457 if (garmin_data_p == NULL) {
1458 dev_err(&port->dev, "%s - Out of memory\n", __func__);
1459 return -ENOMEM;
1460 }
1461 init_timer(&garmin_data_p->timer);
1462 spin_lock_init(&garmin_data_p->lock);
1463 INIT_LIST_HEAD(&garmin_data_p->pktlist);
1464 /* garmin_data_p->timer.expires = jiffies + session_timeout; */
1465 garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1466 garmin_data_p->timer.function = timeout_handler;
1467 garmin_data_p->port = port;
1468 garmin_data_p->state = 0;
1469 garmin_data_p->flags = 0;
1470 garmin_data_p->count = 0;
1471 usb_set_serial_port_data(port, garmin_data_p);
1472
1473 status = garmin_init_session(port);
1474
1475 return status;
1476}
1477
1478
1479static void garmin_disconnect(struct usb_serial *serial)
1480{
1481 struct usb_serial_port *port = serial->port[0];
1482 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1483
1484 dbg("%s", __func__);
1485
1486 usb_kill_urb(port->interrupt_in_urb);
1487 del_timer_sync(&garmin_data_p->timer);
1488}
1489
1490
1491static void garmin_release(struct usb_serial *serial)
1492{
1493 struct usb_serial_port *port = serial->port[0];
1494 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1495
1496 dbg("%s", __func__);
1497
1498 kfree(garmin_data_p);
1499}
1500
1501
1502/* All of the device info needed */
1503static struct usb_serial_driver garmin_device = {
1504 .driver = {
1505 .owner = THIS_MODULE,
1506 .name = "garmin_gps",
1507 },
1508 .description = "Garmin GPS usb/tty",
1509 .usb_driver = &garmin_driver,
1510 .id_table = id_table,
1511 .num_ports = 1,
1512 .open = garmin_open,
1513 .close = garmin_close,
1514 .throttle = garmin_throttle,
1515 .unthrottle = garmin_unthrottle,
1516 .attach = garmin_attach,
1517 .disconnect = garmin_disconnect,
1518 .release = garmin_release,
1519 .write = garmin_write,
1520 .write_room = garmin_write_room,
1521 .write_bulk_callback = garmin_write_bulk_callback,
1522 .read_bulk_callback = garmin_read_bulk_callback,
1523 .read_int_callback = garmin_read_int_callback,
1524};
1525
1526
1527
1528static int __init garmin_init(void)
1529{
1530 int retval;
1531
1532 retval = usb_serial_register(&garmin_device);
1533 if (retval)
1534 goto failed_garmin_register;
1535 retval = usb_register(&garmin_driver);
1536 if (retval)
1537 goto failed_usb_register;
1538 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1539 DRIVER_DESC "\n");
1540
1541 return 0;
1542failed_usb_register:
1543 usb_serial_deregister(&garmin_device);
1544failed_garmin_register:
1545 return retval;
1546}
1547
1548
1549static void __exit garmin_exit(void)
1550{
1551 usb_deregister(&garmin_driver);
1552 usb_serial_deregister(&garmin_device);
1553}
1554
1555
1556
1557
1558module_init(garmin_init);
1559module_exit(garmin_exit);
1560
1561MODULE_AUTHOR(DRIVER_AUTHOR);
1562MODULE_DESCRIPTION(DRIVER_DESC);
1563MODULE_LICENSE("GPL");
1564
1565module_param(debug, bool, S_IWUSR | S_IRUGO);
1566MODULE_PARM_DESC(debug, "Debug enabled or not");
1567module_param(initial_mode, int, S_IRUGO);
1568MODULE_PARM_DESC(initial_mode, "Initial mode");
1569
1/*
2 * Garmin GPS driver
3 *
4 * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de
5 *
6 * The latest version of the driver can be found at
7 * http://sourceforge.net/projects/garmin-gps/
8 *
9 * This driver has been derived from v2.1 of the visor driver.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
24 */
25
26#include <linux/kernel.h>
27#include <linux/errno.h>
28#include <linux/slab.h>
29#include <linux/timer.h>
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33#include <linux/module.h>
34#include <linux/spinlock.h>
35#include <linux/uaccess.h>
36#include <linux/atomic.h>
37#include <linux/usb.h>
38#include <linux/usb/serial.h>
39
40/* the mode to be set when the port ist opened */
41static int initial_mode = 1;
42
43#define GARMIN_VENDOR_ID 0x091E
44
45/*
46 * Version Information
47 */
48
49#define VERSION_MAJOR 0
50#define VERSION_MINOR 36
51
52#define _STR(s) #s
53#define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b)
54#define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
55#define DRIVER_AUTHOR "hermann kneissel"
56#define DRIVER_DESC "garmin gps driver"
57
58/* error codes returned by the driver */
59#define EINVPKT 1000 /* invalid packet structure */
60
61
62/* size of the header of a packet using the usb protocol */
63#define GARMIN_PKTHDR_LENGTH 12
64
65/* max. possible size of a packet using the serial protocol */
66#define MAX_SERIAL_PKT_SIZ (3 + 255 + 3)
67
68/* max. possible size of a packet with worst case stuffing */
69#define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256)
70
71/* size of a buffer able to hold a complete (no stuffing) packet
72 * (the document protocol does not contain packets with a larger
73 * size, but in theory a packet may be 64k+12 bytes - if in
74 * later protocol versions larger packet sizes occur, this value
75 * should be increased accordingly, so the input buffer is always
76 * large enough the store a complete packet inclusive header) */
77#define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
78
79/* size of a buffer able to hold a complete (incl. stuffing) packet */
80#define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
81
82/* where to place the packet id of a serial packet, so we can
83 * prepend the usb-packet header without the need to move the
84 * packets data */
85#define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
86
87/* max. size of incoming private packets (header+1 param) */
88#define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
89
90#define GARMIN_LAYERID_TRANSPORT 0
91#define GARMIN_LAYERID_APPL 20
92/* our own layer-id to use for some control mechanisms */
93#define GARMIN_LAYERID_PRIVATE 0x01106E4B
94
95#define GARMIN_PKTID_PVT_DATA 51
96#define GARMIN_PKTID_L001_COMMAND_DATA 10
97
98#define CMND_ABORT_TRANSFER 0
99
100/* packet ids used in private layer */
101#define PRIV_PKTID_SET_DEBUG 1
102#define PRIV_PKTID_SET_MODE 2
103#define PRIV_PKTID_INFO_REQ 3
104#define PRIV_PKTID_INFO_RESP 4
105#define PRIV_PKTID_RESET_REQ 5
106#define PRIV_PKTID_SET_DEF_MODE 6
107
108
109#define ETX 0x03
110#define DLE 0x10
111#define ACK 0x06
112#define NAK 0x15
113
114/* structure used to queue incoming packets */
115struct garmin_packet {
116 struct list_head list;
117 int seq;
118 /* the real size of the data array, always > 0 */
119 int size;
120 __u8 data[1];
121};
122
123/* structure used to keep the current state of the driver */
124struct garmin_data {
125 __u8 state;
126 __u16 flags;
127 __u8 mode;
128 __u8 count;
129 __u8 pkt_id;
130 __u32 serial_num;
131 struct timer_list timer;
132 struct usb_serial_port *port;
133 int seq_counter;
134 int insize;
135 int outsize;
136 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
137 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
138 __u8 privpkt[4*6];
139 spinlock_t lock;
140 struct list_head pktlist;
141};
142
143
144#define STATE_NEW 0
145#define STATE_INITIAL_DELAY 1
146#define STATE_TIMEOUT 2
147#define STATE_SESSION_REQ1 3
148#define STATE_SESSION_REQ2 4
149#define STATE_ACTIVE 5
150
151#define STATE_RESET 8
152#define STATE_DISCONNECTED 9
153#define STATE_WAIT_TTY_ACK 10
154#define STATE_GSP_WAIT_DATA 11
155
156#define MODE_NATIVE 0
157#define MODE_GARMIN_SERIAL 1
158
159/* Flags used in garmin_data.flags: */
160#define FLAGS_SESSION_REPLY_MASK 0x00C0
161#define FLAGS_SESSION_REPLY1_SEEN 0x0080
162#define FLAGS_SESSION_REPLY2_SEEN 0x0040
163#define FLAGS_BULK_IN_ACTIVE 0x0020
164#define FLAGS_BULK_IN_RESTART 0x0010
165#define FLAGS_THROTTLED 0x0008
166#define APP_REQ_SEEN 0x0004
167#define APP_RESP_SEEN 0x0002
168#define CLEAR_HALT_REQUIRED 0x0001
169
170#define FLAGS_QUEUING 0x0100
171#define FLAGS_DROP_DATA 0x0800
172
173#define FLAGS_GSP_SKIP 0x1000
174#define FLAGS_GSP_DLESEEN 0x2000
175
176
177
178
179
180
181/* function prototypes */
182static int gsp_next_packet(struct garmin_data *garmin_data_p);
183static int garmin_write_bulk(struct usb_serial_port *port,
184 const unsigned char *buf, int count,
185 int dismiss_ack);
186
187/* some special packets to be send or received */
188static unsigned char const GARMIN_START_SESSION_REQ[]
189 = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 };
190static unsigned char const GARMIN_START_SESSION_REPLY[]
191 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
192static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
193 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
194static unsigned char const GARMIN_APP_LAYER_REPLY[]
195 = { 0x14, 0, 0, 0 };
196static unsigned char const GARMIN_START_PVT_REQ[]
197 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
198static unsigned char const GARMIN_STOP_PVT_REQ[]
199 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
200static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
201 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
202static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
203 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
204static unsigned char const PRIVATE_REQ[]
205 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
206
207
208
209static const struct usb_device_id id_table[] = {
210 /* the same device id seems to be used by all
211 usb enabled GPS devices */
212 { USB_DEVICE(GARMIN_VENDOR_ID, 3) },
213 { } /* Terminating entry */
214};
215MODULE_DEVICE_TABLE(usb, id_table);
216
217
218static inline int getLayerId(const __u8 *usbPacket)
219{
220 return __le32_to_cpup((__le32 *)(usbPacket));
221}
222
223static inline int getPacketId(const __u8 *usbPacket)
224{
225 return __le32_to_cpup((__le32 *)(usbPacket+4));
226}
227
228static inline int getDataLength(const __u8 *usbPacket)
229{
230 return __le32_to_cpup((__le32 *)(usbPacket+8));
231}
232
233
234/*
235 * check if the usb-packet in buf contains an abort-transfer command.
236 * (if yes, all queued data will be dropped)
237 */
238static inline int isAbortTrfCmnd(const unsigned char *buf)
239{
240 if (memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
241 sizeof(GARMIN_STOP_TRANSFER_REQ)) == 0 ||
242 memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
243 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)) == 0)
244 return 1;
245 else
246 return 0;
247}
248
249
250
251static void send_to_tty(struct usb_serial_port *port,
252 char *data, unsigned int actual_length)
253{
254 if (actual_length) {
255 usb_serial_debug_data(&port->dev, __func__, actual_length, data);
256 tty_insert_flip_string(&port->port, data, actual_length);
257 tty_flip_buffer_push(&port->port);
258 }
259}
260
261
262/******************************************************************************
263 * packet queue handling
264 ******************************************************************************/
265
266/*
267 * queue a received (usb-)packet for later processing
268 */
269static int pkt_add(struct garmin_data *garmin_data_p,
270 unsigned char *data, unsigned int data_length)
271{
272 int state = 0;
273 int result = 0;
274 unsigned long flags;
275 struct garmin_packet *pkt;
276
277 /* process only packets containing data ... */
278 if (data_length) {
279 pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
280 GFP_ATOMIC);
281 if (!pkt)
282 return 0;
283
284 pkt->size = data_length;
285 memcpy(pkt->data, data, data_length);
286
287 spin_lock_irqsave(&garmin_data_p->lock, flags);
288 garmin_data_p->flags |= FLAGS_QUEUING;
289 result = list_empty(&garmin_data_p->pktlist);
290 pkt->seq = garmin_data_p->seq_counter++;
291 list_add_tail(&pkt->list, &garmin_data_p->pktlist);
292 state = garmin_data_p->state;
293 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
294
295 dev_dbg(&garmin_data_p->port->dev,
296 "%s - added: pkt: %d - %d bytes\n", __func__,
297 pkt->seq, data_length);
298
299 /* in serial mode, if someone is waiting for data from
300 the device, convert and send the next packet to tty. */
301 if (result && (state == STATE_GSP_WAIT_DATA))
302 gsp_next_packet(garmin_data_p);
303 }
304 return result;
305}
306
307
308/* get the next pending packet */
309static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p)
310{
311 unsigned long flags;
312 struct garmin_packet *result = NULL;
313
314 spin_lock_irqsave(&garmin_data_p->lock, flags);
315 if (!list_empty(&garmin_data_p->pktlist)) {
316 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
317 list_del(&result->list);
318 }
319 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
320 return result;
321}
322
323
324/* free up all queued data */
325static void pkt_clear(struct garmin_data *garmin_data_p)
326{
327 unsigned long flags;
328 struct garmin_packet *result = NULL;
329
330 spin_lock_irqsave(&garmin_data_p->lock, flags);
331 while (!list_empty(&garmin_data_p->pktlist)) {
332 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
333 list_del(&result->list);
334 kfree(result);
335 }
336 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
337}
338
339
340/******************************************************************************
341 * garmin serial protocol handling handling
342 ******************************************************************************/
343
344/* send an ack packet back to the tty */
345static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
346{
347 __u8 pkt[10];
348 __u8 cksum = 0;
349 __u8 *ptr = pkt;
350 unsigned l = 0;
351
352 dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__,
353 pkt_id);
354
355 *ptr++ = DLE;
356 *ptr++ = ACK;
357 cksum += ACK;
358
359 *ptr++ = 2;
360 cksum += 2;
361
362 *ptr++ = pkt_id;
363 cksum += pkt_id;
364
365 if (pkt_id == DLE)
366 *ptr++ = DLE;
367
368 *ptr++ = 0;
369 *ptr++ = (-cksum) & 0xFF;
370 *ptr++ = DLE;
371 *ptr++ = ETX;
372
373 l = ptr-pkt;
374
375 send_to_tty(garmin_data_p->port, pkt, l);
376 return 0;
377}
378
379
380
381/*
382 * called for a complete packet received from tty layer
383 *
384 * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
385 * at GSP_INITIAL_OFFSET.
386 *
387 * count - number of bytes in the input buffer including space reserved for
388 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
389 * (including pkt-id, data-length a. cksum)
390 */
391static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
392{
393 struct device *dev = &garmin_data_p->port->dev;
394 unsigned long flags;
395 const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
396 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
397 int cksum = 0;
398 int n = 0;
399 int pktid = recpkt[0];
400 int size = recpkt[1];
401
402 usb_serial_debug_data(&garmin_data_p->port->dev, __func__,
403 count-GSP_INITIAL_OFFSET, recpkt);
404
405 if (size != (count-GSP_INITIAL_OFFSET-3)) {
406 dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n",
407 __func__, size, (count-GSP_INITIAL_OFFSET-3));
408 return -EINVPKT;
409 }
410
411 cksum += *recpkt++;
412 cksum += *recpkt++;
413
414 /* sanity check, remove after test ... */
415 if ((__u8 *)&(usbdata[3]) != recpkt) {
416 dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__,
417 &(usbdata[4]), recpkt);
418 return -EINVPKT;
419 }
420
421 while (n < size) {
422 cksum += *recpkt++;
423 n++;
424 }
425
426 if (((cksum + *recpkt) & 0xff) != 0) {
427 dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n",
428 __func__, -cksum & 0xff, *recpkt);
429 return -EINVPKT;
430 }
431
432 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
433 usbdata[1] = __cpu_to_le32(pktid);
434 usbdata[2] = __cpu_to_le32(size);
435
436 garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
437 GARMIN_PKTHDR_LENGTH+size, 0);
438
439 /* if this was an abort-transfer command, flush all
440 queued data. */
441 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
442 spin_lock_irqsave(&garmin_data_p->lock, flags);
443 garmin_data_p->flags |= FLAGS_DROP_DATA;
444 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
445 pkt_clear(garmin_data_p);
446 }
447
448 return count;
449}
450
451
452
453/*
454 * Called for data received from tty
455 *
456 * buf contains the data read, it may span more than one packet or even
457 * incomplete packets
458 *
459 * input record should be a serial-record, but it may not be complete.
460 * Copy it into our local buffer, until an etx is seen (or an error
461 * occurs).
462 * Once the record is complete, convert into a usb packet and send it
463 * to the bulk pipe, send an ack back to the tty.
464 *
465 * If the input is an ack, just send the last queued packet to the
466 * tty layer.
467 *
468 * if the input is an abort command, drop all queued data.
469 */
470
471static int gsp_receive(struct garmin_data *garmin_data_p,
472 const unsigned char *buf, int count)
473{
474 struct device *dev = &garmin_data_p->port->dev;
475 unsigned long flags;
476 int offs = 0;
477 int ack_or_nak_seen = 0;
478 __u8 *dest;
479 int size;
480 /* dleSeen: set if last byte read was a DLE */
481 int dleSeen;
482 /* skip: if set, skip incoming data until possible start of
483 * new packet
484 */
485 int skip;
486 __u8 data;
487
488 spin_lock_irqsave(&garmin_data_p->lock, flags);
489 dest = garmin_data_p->inbuffer;
490 size = garmin_data_p->insize;
491 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
492 skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
493 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
494
495 /* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n",
496 __func__, dleSeen, skip, size, count); */
497
498 if (size == 0)
499 size = GSP_INITIAL_OFFSET;
500
501 while (offs < count) {
502
503 data = *(buf+offs);
504 offs++;
505
506 if (data == DLE) {
507 if (skip) { /* start of a new pkt */
508 skip = 0;
509 size = GSP_INITIAL_OFFSET;
510 dleSeen = 1;
511 } else if (dleSeen) {
512 dest[size++] = data;
513 dleSeen = 0;
514 } else {
515 dleSeen = 1;
516 }
517 } else if (data == ETX) {
518 if (dleSeen) {
519 /* packet complete */
520
521 data = dest[GSP_INITIAL_OFFSET];
522
523 if (data == ACK) {
524 ack_or_nak_seen = ACK;
525 dev_dbg(dev, "ACK packet complete.\n");
526 } else if (data == NAK) {
527 ack_or_nak_seen = NAK;
528 dev_dbg(dev, "NAK packet complete.\n");
529 } else {
530 dev_dbg(dev, "packet complete - id=0x%X.\n",
531 data);
532 gsp_rec_packet(garmin_data_p, size);
533 }
534
535 skip = 1;
536 size = GSP_INITIAL_OFFSET;
537 dleSeen = 0;
538 } else {
539 dest[size++] = data;
540 }
541 } else if (!skip) {
542
543 if (dleSeen) {
544 size = GSP_INITIAL_OFFSET;
545 dleSeen = 0;
546 }
547
548 dest[size++] = data;
549 }
550
551 if (size >= GPS_IN_BUFSIZ) {
552 dev_dbg(dev, "%s - packet too large.\n", __func__);
553 skip = 1;
554 size = GSP_INITIAL_OFFSET;
555 dleSeen = 0;
556 }
557 }
558
559 spin_lock_irqsave(&garmin_data_p->lock, flags);
560
561 garmin_data_p->insize = size;
562
563 /* copy flags back to structure */
564 if (skip)
565 garmin_data_p->flags |= FLAGS_GSP_SKIP;
566 else
567 garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
568
569 if (dleSeen)
570 garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
571 else
572 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
573
574 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
575
576 if (ack_or_nak_seen) {
577 if (gsp_next_packet(garmin_data_p) > 0)
578 garmin_data_p->state = STATE_ACTIVE;
579 else
580 garmin_data_p->state = STATE_GSP_WAIT_DATA;
581 }
582 return count;
583}
584
585
586
587/*
588 * Sends a usb packet to the tty
589 *
590 * Assumes, that all packages and at an usb-packet boundary.
591 *
592 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
593 */
594static int gsp_send(struct garmin_data *garmin_data_p,
595 const unsigned char *buf, int count)
596{
597 struct device *dev = &garmin_data_p->port->dev;
598 const unsigned char *src;
599 unsigned char *dst;
600 int pktid = 0;
601 int datalen = 0;
602 int cksum = 0;
603 int i = 0;
604 int k;
605
606 dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__,
607 garmin_data_p->state, count);
608
609 k = garmin_data_p->outsize;
610 if ((k+count) > GPS_OUT_BUFSIZ) {
611 dev_dbg(dev, "packet too large\n");
612 garmin_data_p->outsize = 0;
613 return -4;
614 }
615
616 memcpy(garmin_data_p->outbuffer+k, buf, count);
617 k += count;
618 garmin_data_p->outsize = k;
619
620 if (k >= GARMIN_PKTHDR_LENGTH) {
621 pktid = getPacketId(garmin_data_p->outbuffer);
622 datalen = getDataLength(garmin_data_p->outbuffer);
623 i = GARMIN_PKTHDR_LENGTH + datalen;
624 if (k < i)
625 return 0;
626 } else {
627 return 0;
628 }
629
630 dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i);
631
632 /* garmin_data_p->outbuffer now contains a complete packet */
633
634 usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k,
635 garmin_data_p->outbuffer);
636
637 garmin_data_p->outsize = 0;
638
639 if (getLayerId(garmin_data_p->outbuffer) != GARMIN_LAYERID_APPL) {
640 dev_dbg(dev, "not an application packet (%d)\n",
641 getLayerId(garmin_data_p->outbuffer));
642 return -1;
643 }
644
645 if (pktid > 255) {
646 dev_dbg(dev, "packet-id %d too large\n", pktid);
647 return -2;
648 }
649
650 if (datalen > 255) {
651 dev_dbg(dev, "packet-size %d too large\n", datalen);
652 return -3;
653 }
654
655 /* the serial protocol should be able to handle this packet */
656
657 k = 0;
658 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
659 for (i = 0; i < datalen; i++) {
660 if (*src++ == DLE)
661 k++;
662 }
663
664 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
665 if (k > (GARMIN_PKTHDR_LENGTH-2)) {
666 /* can't add stuffing DLEs in place, move data to end
667 of buffer ... */
668 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
669 memcpy(dst, src, datalen);
670 src = dst;
671 }
672
673 dst = garmin_data_p->outbuffer;
674
675 *dst++ = DLE;
676 *dst++ = pktid;
677 cksum += pktid;
678 *dst++ = datalen;
679 cksum += datalen;
680 if (datalen == DLE)
681 *dst++ = DLE;
682
683 for (i = 0; i < datalen; i++) {
684 __u8 c = *src++;
685 *dst++ = c;
686 cksum += c;
687 if (c == DLE)
688 *dst++ = DLE;
689 }
690
691 cksum = -cksum & 0xFF;
692 *dst++ = cksum;
693 if (cksum == DLE)
694 *dst++ = DLE;
695 *dst++ = DLE;
696 *dst++ = ETX;
697
698 i = dst-garmin_data_p->outbuffer;
699
700 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
701
702 garmin_data_p->pkt_id = pktid;
703 garmin_data_p->state = STATE_WAIT_TTY_ACK;
704
705 return i;
706}
707
708
709/*
710 * Process the next pending data packet - if there is one
711 */
712static int gsp_next_packet(struct garmin_data *garmin_data_p)
713{
714 int result = 0;
715 struct garmin_packet *pkt = NULL;
716
717 while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
718 dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq);
719 result = gsp_send(garmin_data_p, pkt->data, pkt->size);
720 if (result > 0) {
721 kfree(pkt);
722 return result;
723 }
724 kfree(pkt);
725 }
726 return result;
727}
728
729
730
731/******************************************************************************
732 * garmin native mode
733 ******************************************************************************/
734
735
736/*
737 * Called for data received from tty
738 *
739 * The input data is expected to be in garmin usb-packet format.
740 *
741 * buf contains the data read, it may span more than one packet
742 * or even incomplete packets
743 */
744static int nat_receive(struct garmin_data *garmin_data_p,
745 const unsigned char *buf, int count)
746{
747 unsigned long flags;
748 __u8 *dest;
749 int offs = 0;
750 int result = count;
751 int len;
752
753 while (offs < count) {
754 /* if buffer contains header, copy rest of data */
755 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
756 len = GARMIN_PKTHDR_LENGTH
757 +getDataLength(garmin_data_p->inbuffer);
758 else
759 len = GARMIN_PKTHDR_LENGTH;
760
761 if (len >= GPS_IN_BUFSIZ) {
762 /* seems to be an invalid packet, ignore rest
763 of input */
764 dev_dbg(&garmin_data_p->port->dev,
765 "%s - packet size too large: %d\n",
766 __func__, len);
767 garmin_data_p->insize = 0;
768 count = 0;
769 result = -EINVPKT;
770 } else {
771 len -= garmin_data_p->insize;
772 if (len > (count-offs))
773 len = (count-offs);
774 if (len > 0) {
775 dest = garmin_data_p->inbuffer
776 + garmin_data_p->insize;
777 memcpy(dest, buf+offs, len);
778 garmin_data_p->insize += len;
779 offs += len;
780 }
781 }
782
783 /* do we have a complete packet ? */
784 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
785 len = GARMIN_PKTHDR_LENGTH+
786 getDataLength(garmin_data_p->inbuffer);
787 if (garmin_data_p->insize >= len) {
788 garmin_write_bulk(garmin_data_p->port,
789 garmin_data_p->inbuffer,
790 len, 0);
791 garmin_data_p->insize = 0;
792
793 /* if this was an abort-transfer command,
794 flush all queued data. */
795 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
796 spin_lock_irqsave(&garmin_data_p->lock,
797 flags);
798 garmin_data_p->flags |= FLAGS_DROP_DATA;
799 spin_unlock_irqrestore(
800 &garmin_data_p->lock, flags);
801 pkt_clear(garmin_data_p);
802 }
803 }
804 }
805 }
806 return result;
807}
808
809
810/******************************************************************************
811 * private packets
812 ******************************************************************************/
813
814static void priv_status_resp(struct usb_serial_port *port)
815{
816 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
817 __le32 *pkt = (__le32 *)garmin_data_p->privpkt;
818
819 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
820 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
821 pkt[2] = __cpu_to_le32(12);
822 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
823 pkt[4] = __cpu_to_le32(garmin_data_p->mode);
824 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
825
826 send_to_tty(port, (__u8 *)pkt, 6 * 4);
827}
828
829
830/******************************************************************************
831 * Garmin specific driver functions
832 ******************************************************************************/
833
834static int process_resetdev_request(struct usb_serial_port *port)
835{
836 unsigned long flags;
837 int status;
838 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
839
840 spin_lock_irqsave(&garmin_data_p->lock, flags);
841 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
842 garmin_data_p->state = STATE_RESET;
843 garmin_data_p->serial_num = 0;
844 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
845
846 usb_kill_urb(port->interrupt_in_urb);
847 dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__);
848 status = usb_reset_device(port->serial->dev);
849 if (status)
850 dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n",
851 __func__, status);
852 return status;
853}
854
855
856
857/*
858 * clear all cached data
859 */
860static int garmin_clear(struct garmin_data *garmin_data_p)
861{
862 unsigned long flags;
863
864 /* flush all queued data */
865 pkt_clear(garmin_data_p);
866
867 spin_lock_irqsave(&garmin_data_p->lock, flags);
868 garmin_data_p->insize = 0;
869 garmin_data_p->outsize = 0;
870 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
871
872 return 0;
873}
874
875
876static int garmin_init_session(struct usb_serial_port *port)
877{
878 struct usb_serial *serial = port->serial;
879 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
880 int status = 0;
881 int i = 0;
882
883 if (status == 0) {
884 usb_kill_urb(port->interrupt_in_urb);
885
886 dev_dbg(&serial->dev->dev, "%s - adding interrupt input\n", __func__);
887 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
888 if (status)
889 dev_err(&serial->dev->dev,
890 "%s - failed submitting interrupt urb, error %d\n",
891 __func__, status);
892 }
893
894 /*
895 * using the initialization method from gpsbabel. See comments in
896 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
897 */
898 if (status == 0) {
899 dev_dbg(&serial->dev->dev, "%s - starting session ...\n", __func__);
900 garmin_data_p->state = STATE_ACTIVE;
901
902 for (i = 0; i < 3; i++) {
903 status = garmin_write_bulk(port,
904 GARMIN_START_SESSION_REQ,
905 sizeof(GARMIN_START_SESSION_REQ), 0);
906
907 if (status < 0)
908 break;
909 }
910
911 if (status > 0)
912 status = 0;
913 }
914
915 return status;
916}
917
918
919
920static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
921{
922 unsigned long flags;
923 int status = 0;
924 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
925
926 spin_lock_irqsave(&garmin_data_p->lock, flags);
927 garmin_data_p->mode = initial_mode;
928 garmin_data_p->count = 0;
929 garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
930 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
931
932 /* shutdown any bulk reads that might be going on */
933 usb_kill_urb(port->write_urb);
934 usb_kill_urb(port->read_urb);
935
936 if (garmin_data_p->state == STATE_RESET)
937 status = garmin_init_session(port);
938
939 garmin_data_p->state = STATE_ACTIVE;
940 return status;
941}
942
943
944static void garmin_close(struct usb_serial_port *port)
945{
946 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
947
948 dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n",
949 __func__, garmin_data_p->mode, garmin_data_p->state,
950 garmin_data_p->flags);
951
952 garmin_clear(garmin_data_p);
953
954 /* shutdown our urbs */
955 usb_kill_urb(port->read_urb);
956 usb_kill_urb(port->write_urb);
957
958 /* keep reset state so we know that we must start a new session */
959 if (garmin_data_p->state != STATE_RESET)
960 garmin_data_p->state = STATE_DISCONNECTED;
961}
962
963
964static void garmin_write_bulk_callback(struct urb *urb)
965{
966 struct usb_serial_port *port = urb->context;
967
968 if (port) {
969 struct garmin_data *garmin_data_p =
970 usb_get_serial_port_data(port);
971
972 if (getLayerId(urb->transfer_buffer) == GARMIN_LAYERID_APPL) {
973
974 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
975 gsp_send_ack(garmin_data_p,
976 ((__u8 *)urb->transfer_buffer)[4]);
977 }
978 }
979 usb_serial_port_softint(port);
980 }
981
982 /* Ignore errors that resulted from garmin_write_bulk with
983 dismiss_ack = 1 */
984
985 /* free up the transfer buffer, as usb_free_urb() does not do this */
986 kfree(urb->transfer_buffer);
987}
988
989
990static int garmin_write_bulk(struct usb_serial_port *port,
991 const unsigned char *buf, int count,
992 int dismiss_ack)
993{
994 unsigned long flags;
995 struct usb_serial *serial = port->serial;
996 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
997 struct urb *urb;
998 unsigned char *buffer;
999 int status;
1000
1001 spin_lock_irqsave(&garmin_data_p->lock, flags);
1002 garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1003 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1004
1005 buffer = kmalloc(count, GFP_ATOMIC);
1006 if (!buffer)
1007 return -ENOMEM;
1008
1009 urb = usb_alloc_urb(0, GFP_ATOMIC);
1010 if (!urb) {
1011 kfree(buffer);
1012 return -ENOMEM;
1013 }
1014
1015 memcpy(buffer, buf, count);
1016
1017 usb_serial_debug_data(&port->dev, __func__, count, buffer);
1018
1019 usb_fill_bulk_urb(urb, serial->dev,
1020 usb_sndbulkpipe(serial->dev,
1021 port->bulk_out_endpointAddress),
1022 buffer, count,
1023 garmin_write_bulk_callback,
1024 dismiss_ack ? NULL : port);
1025 urb->transfer_flags |= URB_ZERO_PACKET;
1026
1027 if (getLayerId(buffer) == GARMIN_LAYERID_APPL) {
1028
1029 spin_lock_irqsave(&garmin_data_p->lock, flags);
1030 garmin_data_p->flags |= APP_REQ_SEEN;
1031 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1032
1033 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1034 pkt_clear(garmin_data_p);
1035 garmin_data_p->state = STATE_GSP_WAIT_DATA;
1036 }
1037 }
1038
1039 /* send it down the pipe */
1040 status = usb_submit_urb(urb, GFP_ATOMIC);
1041 if (status) {
1042 dev_err(&port->dev,
1043 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
1044 __func__, status);
1045 count = status;
1046 kfree(buffer);
1047 }
1048
1049 /* we are done with this urb, so let the host driver
1050 * really free it when it is finished with it */
1051 usb_free_urb(urb);
1052
1053 return count;
1054}
1055
1056static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
1057 const unsigned char *buf, int count)
1058{
1059 struct device *dev = &port->dev;
1060 int pktid, pktsiz, len;
1061 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1062 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1063
1064 usb_serial_debug_data(dev, __func__, count, buf);
1065
1066 if (garmin_data_p->state == STATE_RESET)
1067 return -EIO;
1068
1069 /* check for our private packets */
1070 if (count >= GARMIN_PKTHDR_LENGTH) {
1071 len = PRIVPKTSIZ;
1072 if (count < len)
1073 len = count;
1074
1075 memcpy(garmin_data_p->privpkt, buf, len);
1076
1077 pktsiz = getDataLength(garmin_data_p->privpkt);
1078 pktid = getPacketId(garmin_data_p->privpkt);
1079
1080 if (count == (GARMIN_PKTHDR_LENGTH + pktsiz) &&
1081 getLayerId(garmin_data_p->privpkt) ==
1082 GARMIN_LAYERID_PRIVATE) {
1083
1084 dev_dbg(dev, "%s - processing private request %d\n",
1085 __func__, pktid);
1086
1087 /* drop all unfinished transfers */
1088 garmin_clear(garmin_data_p);
1089
1090 switch (pktid) {
1091 case PRIV_PKTID_SET_MODE:
1092 if (pktsiz != 4)
1093 return -EINVPKT;
1094 garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1095 dev_dbg(dev, "%s - mode set to %d\n",
1096 __func__, garmin_data_p->mode);
1097 break;
1098
1099 case PRIV_PKTID_INFO_REQ:
1100 priv_status_resp(port);
1101 break;
1102
1103 case PRIV_PKTID_RESET_REQ:
1104 process_resetdev_request(port);
1105 break;
1106
1107 case PRIV_PKTID_SET_DEF_MODE:
1108 if (pktsiz != 4)
1109 return -EINVPKT;
1110 initial_mode = __le32_to_cpu(privpkt[3]);
1111 dev_dbg(dev, "%s - initial_mode set to %d\n",
1112 __func__,
1113 garmin_data_p->mode);
1114 break;
1115 }
1116 return count;
1117 }
1118 }
1119
1120 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1121 return gsp_receive(garmin_data_p, buf, count);
1122 } else { /* MODE_NATIVE */
1123 return nat_receive(garmin_data_p, buf, count);
1124 }
1125}
1126
1127
1128static int garmin_write_room(struct tty_struct *tty)
1129{
1130 struct usb_serial_port *port = tty->driver_data;
1131 /*
1132 * Report back the bytes currently available in the output buffer.
1133 */
1134 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1135 return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1136}
1137
1138
1139static void garmin_read_process(struct garmin_data *garmin_data_p,
1140 unsigned char *data, unsigned data_length,
1141 int bulk_data)
1142{
1143 unsigned long flags;
1144
1145 if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1146 /* abort-transfer cmd is active */
1147 dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__);
1148 } else if (garmin_data_p->state != STATE_DISCONNECTED &&
1149 garmin_data_p->state != STATE_RESET) {
1150
1151 /* if throttling is active or postprecessing is required
1152 put the received data in the input queue, otherwise
1153 send it directly to the tty port */
1154 if (garmin_data_p->flags & FLAGS_QUEUING) {
1155 pkt_add(garmin_data_p, data, data_length);
1156 } else if (bulk_data ||
1157 getLayerId(data) == GARMIN_LAYERID_APPL) {
1158
1159 spin_lock_irqsave(&garmin_data_p->lock, flags);
1160 garmin_data_p->flags |= APP_RESP_SEEN;
1161 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1162
1163 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1164 pkt_add(garmin_data_p, data, data_length);
1165 } else {
1166 send_to_tty(garmin_data_p->port, data,
1167 data_length);
1168 }
1169 }
1170 /* ignore system layer packets ... */
1171 }
1172}
1173
1174
1175static void garmin_read_bulk_callback(struct urb *urb)
1176{
1177 unsigned long flags;
1178 struct usb_serial_port *port = urb->context;
1179 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1180 unsigned char *data = urb->transfer_buffer;
1181 int status = urb->status;
1182 int retval;
1183
1184 if (status) {
1185 dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n",
1186 __func__, status);
1187 return;
1188 }
1189
1190 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1191
1192 garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
1193
1194 if (urb->actual_length == 0 &&
1195 (garmin_data_p->flags & FLAGS_BULK_IN_RESTART) != 0) {
1196 spin_lock_irqsave(&garmin_data_p->lock, flags);
1197 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1198 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1199 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1200 if (retval)
1201 dev_err(&port->dev,
1202 "%s - failed resubmitting read urb, error %d\n",
1203 __func__, retval);
1204 } else if (urb->actual_length > 0) {
1205 /* Continue trying to read until nothing more is received */
1206 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1207 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1208 if (retval)
1209 dev_err(&port->dev,
1210 "%s - failed resubmitting read urb, error %d\n",
1211 __func__, retval);
1212 }
1213 } else {
1214 dev_dbg(&port->dev, "%s - end of bulk data\n", __func__);
1215 spin_lock_irqsave(&garmin_data_p->lock, flags);
1216 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1217 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1218 }
1219}
1220
1221
1222static void garmin_read_int_callback(struct urb *urb)
1223{
1224 unsigned long flags;
1225 int retval;
1226 struct usb_serial_port *port = urb->context;
1227 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1228 unsigned char *data = urb->transfer_buffer;
1229 int status = urb->status;
1230
1231 switch (status) {
1232 case 0:
1233 /* success */
1234 break;
1235 case -ECONNRESET:
1236 case -ENOENT:
1237 case -ESHUTDOWN:
1238 /* this urb is terminated, clean up */
1239 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
1240 __func__, status);
1241 return;
1242 default:
1243 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
1244 __func__, status);
1245 return;
1246 }
1247
1248 usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
1249 urb->transfer_buffer);
1250
1251 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1252 memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1253 sizeof(GARMIN_BULK_IN_AVAIL_REPLY)) == 0) {
1254
1255 dev_dbg(&port->dev, "%s - bulk data available.\n", __func__);
1256
1257 if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) == 0) {
1258
1259 /* bulk data available */
1260 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1261 if (retval) {
1262 dev_err(&port->dev,
1263 "%s - failed submitting read urb, error %d\n",
1264 __func__, retval);
1265 } else {
1266 spin_lock_irqsave(&garmin_data_p->lock, flags);
1267 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1268 spin_unlock_irqrestore(&garmin_data_p->lock,
1269 flags);
1270 }
1271 } else {
1272 /* bulk-in transfer still active */
1273 spin_lock_irqsave(&garmin_data_p->lock, flags);
1274 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1275 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1276 }
1277
1278 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1279 && memcmp(data, GARMIN_START_SESSION_REPLY,
1280 sizeof(GARMIN_START_SESSION_REPLY)) == 0) {
1281
1282 spin_lock_irqsave(&garmin_data_p->lock, flags);
1283 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1284 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1285
1286 /* save the serial number */
1287 garmin_data_p->serial_num = __le32_to_cpup(
1288 (__le32 *)(data+GARMIN_PKTHDR_LENGTH));
1289
1290 dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n",
1291 __func__, garmin_data_p->serial_num);
1292 }
1293
1294 garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
1295
1296 retval = usb_submit_urb(urb, GFP_ATOMIC);
1297 if (retval)
1298 dev_err(&urb->dev->dev,
1299 "%s - Error %d submitting interrupt urb\n",
1300 __func__, retval);
1301}
1302
1303
1304/*
1305 * Sends the next queued packt to the tty port (garmin native mode only)
1306 * and then sets a timer to call itself again until all queued data
1307 * is sent.
1308 */
1309static int garmin_flush_queue(struct garmin_data *garmin_data_p)
1310{
1311 unsigned long flags;
1312 struct garmin_packet *pkt;
1313
1314 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1315 pkt = pkt_pop(garmin_data_p);
1316 if (pkt != NULL) {
1317 send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1318 kfree(pkt);
1319 mod_timer(&garmin_data_p->timer, (1)+jiffies);
1320
1321 } else {
1322 spin_lock_irqsave(&garmin_data_p->lock, flags);
1323 garmin_data_p->flags &= ~FLAGS_QUEUING;
1324 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1325 }
1326 }
1327 return 0;
1328}
1329
1330
1331static void garmin_throttle(struct tty_struct *tty)
1332{
1333 struct usb_serial_port *port = tty->driver_data;
1334 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1335
1336 /* set flag, data received will be put into a queue
1337 for later processing */
1338 spin_lock_irq(&garmin_data_p->lock);
1339 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1340 spin_unlock_irq(&garmin_data_p->lock);
1341}
1342
1343
1344static void garmin_unthrottle(struct tty_struct *tty)
1345{
1346 struct usb_serial_port *port = tty->driver_data;
1347 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1348 int status;
1349
1350 spin_lock_irq(&garmin_data_p->lock);
1351 garmin_data_p->flags &= ~FLAGS_THROTTLED;
1352 spin_unlock_irq(&garmin_data_p->lock);
1353
1354 /* in native mode send queued data to tty, in
1355 serial mode nothing needs to be done here */
1356 if (garmin_data_p->mode == MODE_NATIVE)
1357 garmin_flush_queue(garmin_data_p);
1358
1359 if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) != 0) {
1360 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1361 if (status)
1362 dev_err(&port->dev,
1363 "%s - failed resubmitting read urb, error %d\n",
1364 __func__, status);
1365 }
1366}
1367
1368/*
1369 * The timer is currently only used to send queued packets to
1370 * the tty in cases where the protocol provides no own handshaking
1371 * to initiate the transfer.
1372 */
1373static void timeout_handler(unsigned long data)
1374{
1375 struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1376
1377 /* send the next queued packet to the tty port */
1378 if (garmin_data_p->mode == MODE_NATIVE)
1379 if (garmin_data_p->flags & FLAGS_QUEUING)
1380 garmin_flush_queue(garmin_data_p);
1381}
1382
1383
1384
1385static int garmin_port_probe(struct usb_serial_port *port)
1386{
1387 int status;
1388 struct garmin_data *garmin_data_p;
1389
1390 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1391 if (!garmin_data_p)
1392 return -ENOMEM;
1393
1394 init_timer(&garmin_data_p->timer);
1395 spin_lock_init(&garmin_data_p->lock);
1396 INIT_LIST_HEAD(&garmin_data_p->pktlist);
1397 /* garmin_data_p->timer.expires = jiffies + session_timeout; */
1398 garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1399 garmin_data_p->timer.function = timeout_handler;
1400 garmin_data_p->port = port;
1401 garmin_data_p->state = 0;
1402 garmin_data_p->flags = 0;
1403 garmin_data_p->count = 0;
1404 usb_set_serial_port_data(port, garmin_data_p);
1405
1406 status = garmin_init_session(port);
1407
1408 return status;
1409}
1410
1411
1412static int garmin_port_remove(struct usb_serial_port *port)
1413{
1414 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1415
1416 usb_kill_urb(port->interrupt_in_urb);
1417 del_timer_sync(&garmin_data_p->timer);
1418 kfree(garmin_data_p);
1419 return 0;
1420}
1421
1422
1423/* All of the device info needed */
1424static struct usb_serial_driver garmin_device = {
1425 .driver = {
1426 .owner = THIS_MODULE,
1427 .name = "garmin_gps",
1428 },
1429 .description = "Garmin GPS usb/tty",
1430 .id_table = id_table,
1431 .num_ports = 1,
1432 .open = garmin_open,
1433 .close = garmin_close,
1434 .throttle = garmin_throttle,
1435 .unthrottle = garmin_unthrottle,
1436 .port_probe = garmin_port_probe,
1437 .port_remove = garmin_port_remove,
1438 .write = garmin_write,
1439 .write_room = garmin_write_room,
1440 .write_bulk_callback = garmin_write_bulk_callback,
1441 .read_bulk_callback = garmin_read_bulk_callback,
1442 .read_int_callback = garmin_read_int_callback,
1443};
1444
1445static struct usb_serial_driver * const serial_drivers[] = {
1446 &garmin_device, NULL
1447};
1448
1449module_usb_serial_driver(serial_drivers, id_table);
1450
1451MODULE_AUTHOR(DRIVER_AUTHOR);
1452MODULE_DESCRIPTION(DRIVER_DESC);
1453MODULE_LICENSE("GPL");
1454
1455module_param(initial_mode, int, S_IRUGO);
1456MODULE_PARM_DESC(initial_mode, "Initial mode");