xref: /linux/drivers/usb/serial/garmin_gps.c (revision fad837c16cdd856c68ce2e1335ad0fe836ed8ecd)
1 /*
2  * Garmin GPS driver
3  *
4  * Copyright (C) 2006-2009 Hermann Kneissel herkne@users.sourceforge.net
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 <asm/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 */
42 static int initial_mode = 1;
43 
44 /* debug flag */
45 static 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	33
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 */
119 struct 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 */
128 struct 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 */
186 static int gsp_next_packet(struct garmin_data *garmin_data_p);
187 static 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 */
192 static unsigned char const GARMIN_START_SESSION_REQ[]
193 	= { 0, 0, 0, 0,  5, 0, 0, 0, 0, 0, 0, 0 };
194 static unsigned char const GARMIN_START_SESSION_REPLY[]
195 	= { 0, 0, 0, 0,  6, 0, 0, 0, 4, 0, 0, 0 };
196 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
197 	= { 0, 0, 0, 0,  2, 0, 0, 0, 0, 0, 0, 0 };
198 static unsigned char const GARMIN_APP_LAYER_REPLY[]
199 	= { 0x14, 0, 0, 0 };
200 static unsigned char const GARMIN_START_PVT_REQ[]
201 	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
202 static unsigned char const GARMIN_STOP_PVT_REQ[]
203 	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
204 static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
205 	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
206 static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
207 	= { 20, 0, 0, 0,  10, 0, 0, 0, 1, 0, 0, 0, 0 };
208 static unsigned char const PRIVATE_REQ[]
209 	=    { 0x4B, 0x6E, 0x10, 0x01,  0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
210 
211 
212 
213 static 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 
220 MODULE_DEVICE_TABLE(usb, id_table);
221 
222 static 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 
231 static inline int getLayerId(const __u8 *usbPacket)
232 {
233 	return __le32_to_cpup((__le32 *)(usbPacket));
234 }
235 
236 static inline int getPacketId(const __u8 *usbPacket)
237 {
238 	return __le32_to_cpup((__le32 *)(usbPacket+4));
239 }
240 
241 static 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  */
251 static 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 
264 static 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  */
288 static 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 */
328 static 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 */
344 static 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 */
366 static 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  */
411 static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
412 {
413 	const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
414 	__le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
415 
416 	int cksum = 0;
417 	int n = 0;
418 	int pktid = recpkt[0];
419 	int size = recpkt[1];
420 
421 	usb_serial_debug_data(debug, &garmin_data_p->port->dev,
422 			       __func__, count-GSP_INITIAL_OFFSET, recpkt);
423 
424 	if (size != (count-GSP_INITIAL_OFFSET-3)) {
425 		dbg("%s - invalid size, expected %d bytes, got %d",
426 			__func__, size, (count-GSP_INITIAL_OFFSET-3));
427 		return -EINVPKT;
428 	}
429 
430 	cksum += *recpkt++;
431 	cksum += *recpkt++;
432 
433 	/* sanity check, remove after test ... */
434 	if ((__u8 *)&(usbdata[3]) != recpkt) {
435 		dbg("%s - ptr mismatch %p - %p",
436 			__func__, &(usbdata[4]), recpkt);
437 		return -EINVPKT;
438 	}
439 
440 	while (n < size) {
441 		cksum += *recpkt++;
442 		n++;
443 	}
444 
445 	if ((0xff & (cksum + *recpkt)) != 0) {
446 		dbg("%s - invalid checksum, expected %02x, got %02x",
447 			__func__, 0xff & -cksum, 0xff & *recpkt);
448 		return -EINVPKT;
449 	}
450 
451 	usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
452 	usbdata[1] = __cpu_to_le32(pktid);
453 	usbdata[2] = __cpu_to_le32(size);
454 
455 	garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
456 			   GARMIN_PKTHDR_LENGTH+size, 0);
457 
458 	/* if this was an abort-transfer command, flush all
459 	   queued data. */
460 	if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
461 		garmin_data_p->flags |= FLAGS_DROP_DATA;
462 		pkt_clear(garmin_data_p);
463 	}
464 
465 	return count;
466 }
467 
468 
469 
470 /*
471  * Called for data received from tty
472  *
473  * buf contains the data read, it may span more than one packet or even
474  * incomplete packets
475  *
476  * input record should be a serial-record, but it may not be complete.
477  * Copy it into our local buffer, until an etx is seen (or an error
478  * occurs).
479  * Once the record is complete, convert into a usb packet and send it
480  * to the bulk pipe, send an ack back to the tty.
481  *
482  * If the input is an ack, just send the last queued packet to the
483  * tty layer.
484  *
485  * if the input is an abort command, drop all queued data.
486  */
487 
488 static int gsp_receive(struct garmin_data *garmin_data_p,
489 		       const unsigned char *buf, int count)
490 {
491 	unsigned long flags;
492 	int offs = 0;
493 	int ack_or_nak_seen = 0;
494 	__u8 *dest;
495 	int size;
496 	/* dleSeen: set if last byte read was a DLE */
497 	int dleSeen;
498 	/* skip: if set, skip incoming data until possible start of
499 	 *       new packet
500 	 */
501 	int skip;
502 	__u8 data;
503 
504 	spin_lock_irqsave(&garmin_data_p->lock, flags);
505 	dest = garmin_data_p->inbuffer;
506 	size = garmin_data_p->insize;
507 	dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
508 	skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
509 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
510 
511 	/* dbg("%s - dle=%d skip=%d size=%d count=%d",
512 		__func__, dleSeen, skip, size, count); */
513 
514 	if (size == 0)
515 		size = GSP_INITIAL_OFFSET;
516 
517 	while (offs < count) {
518 
519 		data = *(buf+offs);
520 		offs++;
521 
522 		if (data == DLE) {
523 			if (skip) { /* start of a new pkt */
524 				skip = 0;
525 				size = GSP_INITIAL_OFFSET;
526 				dleSeen = 1;
527 			} else if (dleSeen) {
528 				dest[size++] = data;
529 				dleSeen = 0;
530 			} else {
531 				dleSeen = 1;
532 			}
533 		} else if (data == ETX) {
534 			if (dleSeen) {
535 				/* packet complete */
536 
537 				data = dest[GSP_INITIAL_OFFSET];
538 
539 				if (data == ACK) {
540 					ack_or_nak_seen = ACK;
541 					dbg("ACK packet complete.");
542 				} else if (data == NAK) {
543 					ack_or_nak_seen = NAK;
544 					dbg("NAK packet complete.");
545 				} else {
546 					dbg("packet complete - id=0x%X.",
547 						0xFF & data);
548 					gsp_rec_packet(garmin_data_p, size);
549 				}
550 
551 				skip = 1;
552 				size = GSP_INITIAL_OFFSET;
553 				dleSeen = 0;
554 			} else {
555 				dest[size++] = data;
556 			}
557 		} else if (!skip) {
558 
559 			if (dleSeen) {
560 				size = GSP_INITIAL_OFFSET;
561 				dleSeen = 0;
562 			}
563 
564 			dest[size++] = data;
565 		}
566 
567 		if (size >= GPS_IN_BUFSIZ) {
568 			dbg("%s - packet too large.", __func__);
569 			skip = 1;
570 			size = GSP_INITIAL_OFFSET;
571 			dleSeen = 0;
572 		}
573 	}
574 
575 	spin_lock_irqsave(&garmin_data_p->lock, flags);
576 
577 	garmin_data_p->insize = size;
578 
579 	/* copy flags back to structure */
580 	if (skip)
581 		garmin_data_p->flags |= FLAGS_GSP_SKIP;
582 	else
583 		garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
584 
585 	if (dleSeen)
586 		garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
587 	else
588 		garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
589 
590 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
591 
592 	if (ack_or_nak_seen) {
593 		if (gsp_next_packet(garmin_data_p) > 0)
594 			garmin_data_p->state = STATE_ACTIVE;
595 		else
596 			garmin_data_p->state = STATE_GSP_WAIT_DATA;
597 	}
598 	return count;
599 }
600 
601 
602 
603 /*
604  * Sends a usb packet to the tty
605  *
606  * Assumes, that all packages and at an usb-packet boundary.
607  *
608  * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
609  */
610 static int gsp_send(struct garmin_data *garmin_data_p,
611 		    const unsigned char *buf, int count)
612 {
613 	const unsigned char *src;
614 	unsigned char *dst;
615 	int pktid = 0;
616 	int datalen = 0;
617 	int cksum = 0;
618 	int i = 0;
619 	int k;
620 
621 	dbg("%s - state %d - %d bytes.", __func__,
622 					garmin_data_p->state, count);
623 
624 	k = garmin_data_p->outsize;
625 	if ((k+count) > GPS_OUT_BUFSIZ) {
626 		dbg("packet too large");
627 		garmin_data_p->outsize = 0;
628 		return -4;
629 	}
630 
631 	memcpy(garmin_data_p->outbuffer+k, buf, count);
632 	k += count;
633 	garmin_data_p->outsize = k;
634 
635 	if (k >= GARMIN_PKTHDR_LENGTH) {
636 		pktid  = getPacketId(garmin_data_p->outbuffer);
637 		datalen = getDataLength(garmin_data_p->outbuffer);
638 		i = GARMIN_PKTHDR_LENGTH + datalen;
639 		if (k < i)
640 			return 0;
641 	} else {
642 		return 0;
643 	}
644 
645 	dbg("%s - %d bytes in buffer, %d bytes in pkt.", __func__, k, i);
646 
647 	/* garmin_data_p->outbuffer now contains a complete packet */
648 
649 	usb_serial_debug_data(debug, &garmin_data_p->port->dev,
650 				__func__, k, garmin_data_p->outbuffer);
651 
652 	garmin_data_p->outsize = 0;
653 
654 	if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
655 		dbg("not an application packet (%d)",
656 				getLayerId(garmin_data_p->outbuffer));
657 		return -1;
658 	}
659 
660 	if (pktid > 255) {
661 		dbg("packet-id %d too large", pktid);
662 		return -2;
663 	}
664 
665 	if (datalen > 255) {
666 		dbg("packet-size %d too large", datalen);
667 		return -3;
668 	}
669 
670 	/* the serial protocol should be able to handle this packet */
671 
672 	k = 0;
673 	src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
674 	for (i = 0; i < datalen; i++) {
675 		if (*src++ == DLE)
676 			k++;
677 	}
678 
679 	src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
680 	if (k > (GARMIN_PKTHDR_LENGTH-2)) {
681 		/* can't add stuffing DLEs in place, move data to end
682 		   of buffer ... */
683 		dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
684 		memcpy(dst, src, datalen);
685 		src = dst;
686 	}
687 
688 	dst = garmin_data_p->outbuffer;
689 
690 	*dst++ = DLE;
691 	*dst++ = pktid;
692 	cksum += pktid;
693 	*dst++ = datalen;
694 	cksum += datalen;
695 	if (datalen == DLE)
696 		*dst++ = DLE;
697 
698 	for (i = 0; i < datalen; i++) {
699 		__u8 c = *src++;
700 		*dst++ = c;
701 		cksum += c;
702 		if (c == DLE)
703 			*dst++ = DLE;
704 	}
705 
706 	cksum = 0xFF & -cksum;
707 	*dst++ = cksum;
708 	if (cksum == DLE)
709 		*dst++ = DLE;
710 	*dst++ = DLE;
711 	*dst++ = ETX;
712 
713 	i = dst-garmin_data_p->outbuffer;
714 
715 	send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
716 
717 	garmin_data_p->pkt_id = pktid;
718 	garmin_data_p->state  = STATE_WAIT_TTY_ACK;
719 
720 	return i;
721 }
722 
723 
724 /*
725  * Process the next pending data packet - if there is one
726  */
727 static int gsp_next_packet(struct garmin_data *garmin_data_p)
728 {
729 	int result = 0;
730 	struct garmin_packet *pkt = NULL;
731 
732 	while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
733 		dbg("%s - next pkt: %d", __func__, pkt->seq);
734 		result = gsp_send(garmin_data_p, pkt->data, pkt->size);
735 		if (result > 0) {
736 			kfree(pkt);
737 			return result;
738 		}
739 		kfree(pkt);
740 	}
741 	return result;
742 }
743 
744 
745 
746 /******************************************************************************
747  * garmin native mode
748  ******************************************************************************/
749 
750 
751 /*
752  * Called for data received from tty
753  *
754  * The input data is expected to be in garmin usb-packet format.
755  *
756  * buf contains the data read, it may span more than one packet
757  * or even incomplete packets
758  */
759 static int nat_receive(struct garmin_data *garmin_data_p,
760 		       const unsigned char *buf, int count)
761 {
762 	unsigned long flags;
763 	__u8 *dest;
764 	int offs = 0;
765 	int result = count;
766 	int len;
767 
768 	while (offs < count) {
769 		/* if buffer contains header, copy rest of data */
770 		if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
771 			len = GARMIN_PKTHDR_LENGTH
772 			      +getDataLength(garmin_data_p->inbuffer);
773 		else
774 			len = GARMIN_PKTHDR_LENGTH;
775 
776 		if (len >= GPS_IN_BUFSIZ) {
777 			/* seems to be an invalid packet, ignore rest
778 			   of input */
779 			dbg("%s - packet size too large: %d", __func__, len);
780 			garmin_data_p->insize = 0;
781 			count = 0;
782 			result = -EINVPKT;
783 		} else {
784 			len -= garmin_data_p->insize;
785 			if (len > (count-offs))
786 				len = (count-offs);
787 			if (len > 0) {
788 				dest = garmin_data_p->inbuffer
789 						+ garmin_data_p->insize;
790 				memcpy(dest, buf+offs, len);
791 				garmin_data_p->insize += len;
792 				offs += len;
793 			}
794 		}
795 
796 		/* do we have a complete packet ? */
797 		if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
798 			len = GARMIN_PKTHDR_LENGTH+
799 			   getDataLength(garmin_data_p->inbuffer);
800 			if (garmin_data_p->insize >= len) {
801 				garmin_write_bulk(garmin_data_p->port,
802 						   garmin_data_p->inbuffer,
803 						   len, 0);
804 				garmin_data_p->insize = 0;
805 
806 				/* if this was an abort-transfer command,
807 				   flush all queued data. */
808 				if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
809 					spin_lock_irqsave(&garmin_data_p->lock,
810 									flags);
811 					garmin_data_p->flags |= FLAGS_DROP_DATA;
812 					spin_unlock_irqrestore(
813 						&garmin_data_p->lock, flags);
814 					pkt_clear(garmin_data_p);
815 				}
816 			}
817 		}
818 	}
819 	return result;
820 }
821 
822 
823 /******************************************************************************
824  * private packets
825  ******************************************************************************/
826 
827 static void priv_status_resp(struct usb_serial_port *port)
828 {
829 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
830 	__le32 *pkt = (__le32 *)garmin_data_p->privpkt;
831 
832 	pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
833 	pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
834 	pkt[2] = __cpu_to_le32(12);
835 	pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
836 	pkt[4] = __cpu_to_le32(garmin_data_p->mode);
837 	pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
838 
839 	send_to_tty(port, (__u8 *)pkt, 6 * 4);
840 }
841 
842 
843 /******************************************************************************
844  * Garmin specific driver functions
845  ******************************************************************************/
846 
847 static int process_resetdev_request(struct usb_serial_port *port)
848 {
849 	unsigned long flags;
850 	int status;
851 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
852 
853 	spin_lock_irqsave(&garmin_data_p->lock, flags);
854 	garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
855 	garmin_data_p->state = STATE_RESET;
856 	garmin_data_p->serial_num = 0;
857 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
858 
859 	usb_kill_urb(port->interrupt_in_urb);
860 	dbg("%s - usb_reset_device", __func__);
861 	status = usb_reset_device(port->serial->dev);
862 	if (status)
863 		dbg("%s - usb_reset_device failed: %d",
864 			__func__, status);
865 	return status;
866 }
867 
868 
869 
870 /*
871  * clear all cached data
872  */
873 static int garmin_clear(struct garmin_data *garmin_data_p)
874 {
875 	unsigned long flags;
876 	int status = 0;
877 
878 	/* flush all queued data */
879 	pkt_clear(garmin_data_p);
880 
881 	spin_lock_irqsave(&garmin_data_p->lock, flags);
882 	garmin_data_p->insize = 0;
883 	garmin_data_p->outsize = 0;
884 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
885 
886 	return status;
887 }
888 
889 
890 static int garmin_init_session(struct usb_serial_port *port)
891 {
892 	struct usb_serial *serial = port->serial;
893 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
894 	int status = 0;
895 	int i = 0;
896 
897 	if (status == 0) {
898 		usb_kill_urb(port->interrupt_in_urb);
899 
900 		dbg("%s - adding interrupt input", __func__);
901 		port->interrupt_in_urb->dev = serial->dev;
902 		status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
903 		if (status)
904 			dev_err(&serial->dev->dev,
905 			  "%s - failed submitting interrupt urb, error %d\n",
906 							__func__, status);
907 	}
908 
909 	/*
910 	 * using the initialization method from gpsbabel. See comments in
911 	 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
912 	 */
913 	if (status == 0) {
914 		dbg("%s - starting session ...", __func__);
915 		garmin_data_p->state = STATE_ACTIVE;
916 
917 		for (i = 0; i < 3; i++) {
918 			status = garmin_write_bulk(port,
919 					GARMIN_START_SESSION_REQ,
920 					sizeof(GARMIN_START_SESSION_REQ), 0);
921 
922 			if (status < 0)
923 				break;
924 		}
925 
926 		if (status > 0)
927 			status = 0;
928 	}
929 
930 	return status;
931 }
932 
933 
934 
935 static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
936 {
937 	unsigned long flags;
938 	int status = 0;
939 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
940 
941 	dbg("%s - port %d", __func__, port->number);
942 
943 	spin_lock_irqsave(&garmin_data_p->lock, flags);
944 	garmin_data_p->mode  = initial_mode;
945 	garmin_data_p->count = 0;
946 	garmin_data_p->flags = 0;
947 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
948 
949 	/* shutdown any bulk reads that might be going on */
950 	usb_kill_urb(port->write_urb);
951 	usb_kill_urb(port->read_urb);
952 
953 	if (garmin_data_p->state == STATE_RESET)
954 		status = garmin_init_session(port);
955 
956 	garmin_data_p->state = STATE_ACTIVE;
957 	return status;
958 }
959 
960 
961 static void garmin_close(struct usb_serial_port *port)
962 {
963 	struct usb_serial *serial = port->serial;
964 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
965 
966 	dbg("%s - port %d - mode=%d state=%d flags=0x%X", __func__,
967 		port->number, garmin_data_p->mode,
968 		garmin_data_p->state, garmin_data_p->flags);
969 
970 	if (!serial)
971 		return;
972 
973 	mutex_lock(&port->serial->disc_mutex);
974 
975 	if (!port->serial->disconnected)
976 		garmin_clear(garmin_data_p);
977 
978 	/* shutdown our urbs */
979 	usb_kill_urb(port->read_urb);
980 	usb_kill_urb(port->write_urb);
981 
982 	/* keep reset state so we know that we must start a new session */
983 	if (garmin_data_p->state != STATE_RESET)
984 		garmin_data_p->state = STATE_DISCONNECTED;
985 
986 	mutex_unlock(&port->serial->disc_mutex);
987 }
988 
989 
990 static void garmin_write_bulk_callback(struct urb *urb)
991 {
992 	struct usb_serial_port *port = urb->context;
993 
994 	if (port) {
995 		struct garmin_data *garmin_data_p =
996 					usb_get_serial_port_data(port);
997 
998 		dbg("%s - port %d", __func__, port->number);
999 
1000 		if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)) {
1001 
1002 			if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1003 				gsp_send_ack(garmin_data_p,
1004 					((__u8 *)urb->transfer_buffer)[4]);
1005 			}
1006 		}
1007 		usb_serial_port_softint(port);
1008 	}
1009 
1010 	/* Ignore errors that resulted from garmin_write_bulk with
1011 	   dismiss_ack = 1 */
1012 
1013 	/* free up the transfer buffer, as usb_free_urb() does not do this */
1014 	kfree(urb->transfer_buffer);
1015 }
1016 
1017 
1018 static int garmin_write_bulk(struct usb_serial_port *port,
1019 			      const unsigned char *buf, int count,
1020 			      int dismiss_ack)
1021 {
1022 	unsigned long flags;
1023 	struct usb_serial *serial = port->serial;
1024 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1025 	struct urb *urb;
1026 	unsigned char *buffer;
1027 	int status;
1028 
1029 	dbg("%s - port %d, state %d", __func__, port->number,
1030 		garmin_data_p->state);
1031 
1032 	spin_lock_irqsave(&garmin_data_p->lock, flags);
1033 	garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1034 	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1035 
1036 	buffer = kmalloc(count, GFP_ATOMIC);
1037 	if (!buffer) {
1038 		dev_err(&port->dev, "out of memory\n");
1039 		return -ENOMEM;
1040 	}
1041 
1042 	urb = usb_alloc_urb(0, GFP_ATOMIC);
1043 	if (!urb) {
1044 		dev_err(&port->dev, "no more free urbs\n");
1045 		kfree(buffer);
1046 		return -ENOMEM;
1047 	}
1048 
1049 	memcpy(buffer, buf, count);
1050 
1051 	usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
1052 
1053 	usb_fill_bulk_urb(urb, serial->dev,
1054 				usb_sndbulkpipe(serial->dev,
1055 					port->bulk_out_endpointAddress),
1056 				buffer, count,
1057 				garmin_write_bulk_callback,
1058 				dismiss_ack ? NULL : port);
1059 	urb->transfer_flags |= URB_ZERO_PACKET;
1060 
1061 	if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
1062 
1063 		spin_lock_irqsave(&garmin_data_p->lock, flags);
1064 		garmin_data_p->flags |= APP_REQ_SEEN;
1065 		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1066 
1067 		if (garmin_data_p->mode == MODE_GARMIN_SERIAL)  {
1068 			pkt_clear(garmin_data_p);
1069 			garmin_data_p->state = STATE_GSP_WAIT_DATA;
1070 		}
1071 	}
1072 
1073 	/* send it down the pipe */
1074 	status = usb_submit_urb(urb, GFP_ATOMIC);
1075 	if (status) {
1076 		dev_err(&port->dev,
1077 		   "%s - usb_submit_urb(write bulk) failed with status = %d\n",
1078 				__func__, status);
1079 		count = status;
1080 	}
1081 
1082 	/* we are done with this urb, so let the host driver
1083 	 * really free it when it is finished with it */
1084 	usb_free_urb(urb);
1085 
1086 	return count;
1087 }
1088 
1089 static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
1090 					 const unsigned char *buf, int count)
1091 {
1092 	int pktid, pktsiz, len;
1093 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1094 	__le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1095 
1096 	usb_serial_debug_data(debug, &port->dev, __func__, count, buf);
1097 
1098 	if (garmin_data_p->state == STATE_RESET)
1099 		return -EIO;
1100 
1101 	/* check for our private packets */
1102 	if (count >= GARMIN_PKTHDR_LENGTH) {
1103 		len = PRIVPKTSIZ;
1104 		if (count < len)
1105 			len = count;
1106 
1107 		memcpy(garmin_data_p->privpkt, buf, len);
1108 
1109 		pktsiz = getDataLength(garmin_data_p->privpkt);
1110 		pktid  = getPacketId(garmin_data_p->privpkt);
1111 
1112 		if (count == (GARMIN_PKTHDR_LENGTH+pktsiz)
1113 		    && GARMIN_LAYERID_PRIVATE ==
1114 				getLayerId(garmin_data_p->privpkt)) {
1115 
1116 			dbg("%s - processing private request %d",
1117 				__func__, pktid);
1118 
1119 			/* drop all unfinished transfers */
1120 			garmin_clear(garmin_data_p);
1121 
1122 			switch (pktid) {
1123 
1124 			case PRIV_PKTID_SET_DEBUG:
1125 				if (pktsiz != 4)
1126 					return -EINVPKT;
1127 				debug = __le32_to_cpu(privpkt[3]);
1128 				dbg("%s - debug level set to 0x%X",
1129 					__func__, debug);
1130 				break;
1131 
1132 			case PRIV_PKTID_SET_MODE:
1133 				if (pktsiz != 4)
1134 					return -EINVPKT;
1135 				garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1136 				dbg("%s - mode set to %d",
1137 					__func__, garmin_data_p->mode);
1138 				break;
1139 
1140 			case PRIV_PKTID_INFO_REQ:
1141 				priv_status_resp(port);
1142 				break;
1143 
1144 			case PRIV_PKTID_RESET_REQ:
1145 				process_resetdev_request(port);
1146 				break;
1147 
1148 			case PRIV_PKTID_SET_DEF_MODE:
1149 				if (pktsiz != 4)
1150 					return -EINVPKT;
1151 				initial_mode = __le32_to_cpu(privpkt[3]);
1152 				dbg("%s - initial_mode set to %d",
1153 					__func__,
1154 					garmin_data_p->mode);
1155 				break;
1156 			}
1157 			return count;
1158 		}
1159 	}
1160 
1161 	if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1162 		return gsp_receive(garmin_data_p, buf, count);
1163 	} else {	/* MODE_NATIVE */
1164 		return nat_receive(garmin_data_p, buf, count);
1165 	}
1166 }
1167 
1168 
1169 static int garmin_write_room(struct tty_struct *tty)
1170 {
1171 	struct usb_serial_port *port = tty->driver_data;
1172 	/*
1173 	 * Report back the bytes currently available in the output buffer.
1174 	 */
1175 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1176 	return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1177 }
1178 
1179 
1180 static void garmin_read_process(struct garmin_data *garmin_data_p,
1181 				 unsigned char *data, unsigned data_length)
1182 {
1183 	unsigned long flags;
1184 
1185 	if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1186 		/* abort-transfer cmd is actice */
1187 		dbg("%s - pkt dropped", __func__);
1188 	} else if (garmin_data_p->state != STATE_DISCONNECTED &&
1189 		garmin_data_p->state != STATE_RESET) {
1190 
1191 		/* if throttling is active or postprecessing is required
1192 		   put the received data in the input queue, otherwise
1193 		   send it directly to the tty port */
1194 		if (garmin_data_p->flags & FLAGS_QUEUING) {
1195 			pkt_add(garmin_data_p, data, data_length);
1196 		} else if (getLayerId(data) == GARMIN_LAYERID_APPL) {
1197 
1198 			spin_lock_irqsave(&garmin_data_p->lock, flags);
1199 			garmin_data_p->flags |= APP_RESP_SEEN;
1200 			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1201 
1202 			if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1203 				pkt_add(garmin_data_p, data, data_length);
1204 			} else {
1205 				send_to_tty(garmin_data_p->port, data,
1206 						data_length);
1207 			}
1208 		}
1209 		/* ignore system layer packets ... */
1210 	}
1211 }
1212 
1213 
1214 static void garmin_read_bulk_callback(struct urb *urb)
1215 {
1216 	unsigned long flags;
1217 	struct usb_serial_port *port = urb->context;
1218 	struct usb_serial *serial =  port->serial;
1219 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1220 	unsigned char *data = urb->transfer_buffer;
1221 	int status = urb->status;
1222 	int retval;
1223 
1224 	dbg("%s - port %d", __func__, port->number);
1225 
1226 	if (!serial) {
1227 		dbg("%s - bad serial pointer, exiting", __func__);
1228 		return;
1229 	}
1230 
1231 	if (status) {
1232 		dbg("%s - nonzero read bulk status received: %d",
1233 			__func__, status);
1234 		return;
1235 	}
1236 
1237 	usb_serial_debug_data(debug, &port->dev,
1238 				__func__, urb->actual_length, data);
1239 
1240 	garmin_read_process(garmin_data_p, data, urb->actual_length);
1241 
1242 	if (urb->actual_length == 0 &&
1243 			0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
1244 		spin_lock_irqsave(&garmin_data_p->lock, flags);
1245 		garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1246 		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1247 		retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1248 		if (retval)
1249 			dev_err(&port->dev,
1250 				"%s - failed resubmitting read urb, error %d\n",
1251 				__func__, retval);
1252 	} else if (urb->actual_length > 0) {
1253 		/* Continue trying to read until nothing more is received  */
1254 		if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
1255 			retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1256 			if (retval)
1257 				dev_err(&port->dev,
1258 					"%s - failed resubmitting read urb, "
1259 					"error %d\n", __func__, retval);
1260 		}
1261 	} else {
1262 		dbg("%s - end of bulk data", __func__);
1263 		spin_lock_irqsave(&garmin_data_p->lock, flags);
1264 		garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1265 		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1266 	}
1267 	return;
1268 }
1269 
1270 
1271 static void garmin_read_int_callback(struct urb *urb)
1272 {
1273 	unsigned long flags;
1274 	int retval;
1275 	struct usb_serial_port *port = urb->context;
1276 	struct usb_serial *serial = port->serial;
1277 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1278 	unsigned char *data = urb->transfer_buffer;
1279 	int status = urb->status;
1280 
1281 	switch (status) {
1282 	case 0:
1283 		/* success */
1284 		break;
1285 	case -ECONNRESET:
1286 	case -ENOENT:
1287 	case -ESHUTDOWN:
1288 		/* this urb is terminated, clean up */
1289 		dbg("%s - urb shutting down with status: %d",
1290 			__func__, status);
1291 		return;
1292 	default:
1293 		dbg("%s - nonzero urb status received: %d",
1294 			__func__, status);
1295 		return;
1296 	}
1297 
1298 	usb_serial_debug_data(debug, &port->dev, __func__,
1299 				urb->actual_length, urb->transfer_buffer);
1300 
1301 	if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1302 	    0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1303 				sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
1304 
1305 		dbg("%s - bulk data available.", __func__);
1306 
1307 		if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1308 
1309 			/* bulk data available */
1310 			usb_fill_bulk_urb(port->read_urb, serial->dev,
1311 					usb_rcvbulkpipe(serial->dev,
1312 						port->bulk_in_endpointAddress),
1313 					port->read_urb->transfer_buffer,
1314 					port->read_urb->transfer_buffer_length,
1315 					garmin_read_bulk_callback, port);
1316 			retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1317 			if (retval) {
1318 				dev_err(&port->dev,
1319 				 "%s - failed submitting read urb, error %d\n",
1320 							__func__, retval);
1321 			} else {
1322 				spin_lock_irqsave(&garmin_data_p->lock, flags);
1323 				garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1324 				spin_unlock_irqrestore(&garmin_data_p->lock,
1325 									flags);
1326 			}
1327 		} else {
1328 			/* bulk-in transfer still active */
1329 			spin_lock_irqsave(&garmin_data_p->lock, flags);
1330 			garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1331 			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1332 		}
1333 
1334 	} else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1335 			 && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
1336 					sizeof(GARMIN_START_SESSION_REPLY))) {
1337 
1338 		spin_lock_irqsave(&garmin_data_p->lock, flags);
1339 		garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1340 		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1341 
1342 		/* save the serial number */
1343 		garmin_data_p->serial_num = __le32_to_cpup(
1344 					(__le32 *)(data+GARMIN_PKTHDR_LENGTH));
1345 
1346 		dbg("%s - start-of-session reply seen - serial %u.",
1347 			__func__, garmin_data_p->serial_num);
1348 	}
1349 
1350 	garmin_read_process(garmin_data_p, data, urb->actual_length);
1351 
1352 	port->interrupt_in_urb->dev = port->serial->dev;
1353 	retval = usb_submit_urb(urb, GFP_ATOMIC);
1354 	if (retval)
1355 		dev_err(&urb->dev->dev,
1356 			"%s - Error %d submitting interrupt urb\n",
1357 			__func__, retval);
1358 }
1359 
1360 
1361 /*
1362  * Sends the next queued packt to the tty port (garmin native mode only)
1363  * and then sets a timer to call itself again until all queued data
1364  * is sent.
1365  */
1366 static int garmin_flush_queue(struct garmin_data *garmin_data_p)
1367 {
1368 	unsigned long flags;
1369 	struct garmin_packet *pkt;
1370 
1371 	if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1372 		pkt = pkt_pop(garmin_data_p);
1373 		if (pkt != NULL) {
1374 			send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1375 			kfree(pkt);
1376 			mod_timer(&garmin_data_p->timer, (1)+jiffies);
1377 
1378 		} else {
1379 			spin_lock_irqsave(&garmin_data_p->lock, flags);
1380 			garmin_data_p->flags &= ~FLAGS_QUEUING;
1381 			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1382 		}
1383 	}
1384 	return 0;
1385 }
1386 
1387 
1388 static void garmin_throttle(struct tty_struct *tty)
1389 {
1390 	struct usb_serial_port *port = tty->driver_data;
1391 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1392 
1393 	dbg("%s - port %d", __func__, port->number);
1394 	/* set flag, data received will be put into a queue
1395 	   for later processing */
1396 	spin_lock_irq(&garmin_data_p->lock);
1397 	garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1398 	spin_unlock_irq(&garmin_data_p->lock);
1399 }
1400 
1401 
1402 static void garmin_unthrottle(struct tty_struct *tty)
1403 {
1404 	struct usb_serial_port *port = tty->driver_data;
1405 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1406 	int status;
1407 
1408 	dbg("%s - port %d", __func__, port->number);
1409 	spin_lock_irq(&garmin_data_p->lock);
1410 	garmin_data_p->flags &= ~FLAGS_THROTTLED;
1411 	spin_unlock_irq(&garmin_data_p->lock);
1412 
1413 	/* in native mode send queued data to tty, in
1414 	   serial mode nothing needs to be done here */
1415 	if (garmin_data_p->mode == MODE_NATIVE)
1416 		garmin_flush_queue(garmin_data_p);
1417 
1418 	if (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1419 		status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1420 		if (status)
1421 			dev_err(&port->dev,
1422 				"%s - failed resubmitting read urb, error %d\n",
1423 				__func__, status);
1424 	}
1425 }
1426 
1427 /*
1428  * The timer is currently only used to send queued packets to
1429  * the tty in cases where the protocol provides no own handshaking
1430  * to initiate the transfer.
1431  */
1432 static void timeout_handler(unsigned long data)
1433 {
1434 	struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1435 
1436 	/* send the next queued packet to the tty port */
1437 	if (garmin_data_p->mode == MODE_NATIVE)
1438 		if (garmin_data_p->flags & FLAGS_QUEUING)
1439 			garmin_flush_queue(garmin_data_p);
1440 }
1441 
1442 
1443 
1444 static int garmin_attach(struct usb_serial *serial)
1445 {
1446 	int status = 0;
1447 	struct usb_serial_port *port = serial->port[0];
1448 	struct garmin_data *garmin_data_p = NULL;
1449 
1450 	dbg("%s", __func__);
1451 
1452 	garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1453 	if (garmin_data_p == NULL) {
1454 		dev_err(&port->dev, "%s - Out of memory\n", __func__);
1455 		return -ENOMEM;
1456 	}
1457 	init_timer(&garmin_data_p->timer);
1458 	spin_lock_init(&garmin_data_p->lock);
1459 	INIT_LIST_HEAD(&garmin_data_p->pktlist);
1460 	/* garmin_data_p->timer.expires = jiffies + session_timeout; */
1461 	garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1462 	garmin_data_p->timer.function = timeout_handler;
1463 	garmin_data_p->port = port;
1464 	garmin_data_p->state = 0;
1465 	garmin_data_p->count = 0;
1466 	usb_set_serial_port_data(port, garmin_data_p);
1467 
1468 	status = garmin_init_session(port);
1469 
1470 	return status;
1471 }
1472 
1473 
1474 static void garmin_disconnect(struct usb_serial *serial)
1475 {
1476 	struct usb_serial_port *port = serial->port[0];
1477 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1478 
1479 	dbg("%s", __func__);
1480 
1481 	usb_kill_urb(port->interrupt_in_urb);
1482 	del_timer_sync(&garmin_data_p->timer);
1483 }
1484 
1485 
1486 static void garmin_release(struct usb_serial *serial)
1487 {
1488 	struct usb_serial_port *port = serial->port[0];
1489 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1490 
1491 	dbg("%s", __func__);
1492 
1493 	kfree(garmin_data_p);
1494 }
1495 
1496 
1497 /* All of the device info needed */
1498 static struct usb_serial_driver garmin_device = {
1499 	.driver = {
1500 		.owner       = THIS_MODULE,
1501 		.name        = "garmin_gps",
1502 	},
1503 	.description         = "Garmin GPS usb/tty",
1504 	.usb_driver          = &garmin_driver,
1505 	.id_table            = id_table,
1506 	.num_ports           = 1,
1507 	.open                = garmin_open,
1508 	.close               = garmin_close,
1509 	.throttle            = garmin_throttle,
1510 	.unthrottle          = garmin_unthrottle,
1511 	.attach              = garmin_attach,
1512 	.disconnect          = garmin_disconnect,
1513 	.release             = garmin_release,
1514 	.write               = garmin_write,
1515 	.write_room          = garmin_write_room,
1516 	.write_bulk_callback = garmin_write_bulk_callback,
1517 	.read_bulk_callback  = garmin_read_bulk_callback,
1518 	.read_int_callback   = garmin_read_int_callback,
1519 };
1520 
1521 
1522 
1523 static int __init garmin_init(void)
1524 {
1525 	int retval;
1526 
1527 	retval = usb_serial_register(&garmin_device);
1528 	if (retval)
1529 		goto failed_garmin_register;
1530 	retval = usb_register(&garmin_driver);
1531 	if (retval)
1532 		goto failed_usb_register;
1533 	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1534 	       DRIVER_DESC "\n");
1535 
1536 	return 0;
1537 failed_usb_register:
1538 	usb_serial_deregister(&garmin_device);
1539 failed_garmin_register:
1540 	return retval;
1541 }
1542 
1543 
1544 static void __exit garmin_exit(void)
1545 {
1546 	usb_deregister(&garmin_driver);
1547 	usb_serial_deregister(&garmin_device);
1548 }
1549 
1550 
1551 
1552 
1553 module_init(garmin_init);
1554 module_exit(garmin_exit);
1555 
1556 MODULE_AUTHOR(DRIVER_AUTHOR);
1557 MODULE_DESCRIPTION(DRIVER_DESC);
1558 MODULE_LICENSE("GPL");
1559 
1560 module_param(debug, bool, S_IWUSR | S_IRUGO);
1561 MODULE_PARM_DESC(debug, "Debug enabled or not");
1562 module_param(initial_mode, int, S_IRUGO);
1563 MODULE_PARM_DESC(initial_mode, "Initial mode");
1564 
1565