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Merge git://www.linux-watchdog.org/linux-watchdog
[linux/fpc-iii.git] / drivers / usb / serial / garmin_gps.c
blob04b5ed90ffb2ded9739407e081e4dd4f52794e69
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 */
42 static int initial_mode = 1;
43
44 #define GARMIN_VENDOR_ID 0x091E
45
46 /*
47 * Version Information
48 */
49
50 #define VERSION_MAJOR 0
51 #define VERSION_MINOR 36
52
53 #define _STR(s) #s
54 #define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b)
55 #define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
56 #define DRIVER_AUTHOR "hermann kneissel"
57 #define DRIVER_DESC "garmin gps driver"
58
59 /* error codes returned by the driver */
60 #define EINVPKT 1000 /* invalid packet structure */
61
62
63 /* size of the header of a packet using the usb protocol */
64 #define GARMIN_PKTHDR_LENGTH 12
65
66 /* max. possible size of a packet using the serial protocol */
67 #define MAX_SERIAL_PKT_SIZ (3 + 255 + 3)
68
69 /* max. possible size of a packet with worst case stuffing */
70 #define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256)
71
72 /* size of a buffer able to hold a complete (no stuffing) packet
73 * (the document protocol does not contain packets with a larger
74 * size, but in theory a packet may be 64k+12 bytes - if in
75 * later protocol versions larger packet sizes occur, this value
76 * should be increased accordingly, so the input buffer is always
77 * large enough the store a complete packet inclusive header) */
78 #define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
79
80 /* size of a buffer able to hold a complete (incl. stuffing) packet */
81 #define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
82
83 /* where to place the packet id of a serial packet, so we can
84 * prepend the usb-packet header without the need to move the
85 * packets data */
86 #define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
87
88 /* max. size of incoming private packets (header+1 param) */
89 #define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
90
91 #define GARMIN_LAYERID_TRANSPORT 0
92 #define GARMIN_LAYERID_APPL 20
93 /* our own layer-id to use for some control mechanisms */
94 #define GARMIN_LAYERID_PRIVATE 0x01106E4B
95
96 #define GARMIN_PKTID_PVT_DATA 51
97 #define GARMIN_PKTID_L001_COMMAND_DATA 10
98
99 #define CMND_ABORT_TRANSFER 0
100
101 /* packet ids used in private layer */
102 #define PRIV_PKTID_SET_DEBUG 1
103 #define PRIV_PKTID_SET_MODE 2
104 #define PRIV_PKTID_INFO_REQ 3
105 #define PRIV_PKTID_INFO_RESP 4
106 #define PRIV_PKTID_RESET_REQ 5
107 #define PRIV_PKTID_SET_DEF_MODE 6
108
109
110 #define ETX 0x03
111 #define DLE 0x10
112 #define ACK 0x06
113 #define NAK 0x15
114
115 /* structure used to queue incoming packets */
116 struct garmin_packet {
117 struct list_head list;
118 int seq;
119 /* the real size of the data array, always > 0 */
120 int size;
121 __u8 data[1];
122 };
123
124 /* structure used to keep the current state of the driver */
125 struct garmin_data {
126 __u8 state;
127 __u16 flags;
128 __u8 mode;
129 __u8 count;
130 __u8 pkt_id;
131 __u32 serial_num;
132 struct timer_list timer;
133 struct usb_serial_port *port;
134 int seq_counter;
135 int insize;
136 int outsize;
137 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
138 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
139 __u8 privpkt[4*6];
140 spinlock_t lock;
141 struct list_head pktlist;
142 };
143
144
145 #define STATE_NEW 0
146 #define STATE_INITIAL_DELAY 1
147 #define STATE_TIMEOUT 2
148 #define STATE_SESSION_REQ1 3
149 #define STATE_SESSION_REQ2 4
150 #define STATE_ACTIVE 5
151
152 #define STATE_RESET 8
153 #define STATE_DISCONNECTED 9
154 #define STATE_WAIT_TTY_ACK 10
155 #define STATE_GSP_WAIT_DATA 11
156
157 #define MODE_NATIVE 0
158 #define MODE_GARMIN_SERIAL 1
159
160 /* Flags used in garmin_data.flags: */
161 #define FLAGS_SESSION_REPLY_MASK 0x00C0
162 #define FLAGS_SESSION_REPLY1_SEEN 0x0080
163 #define FLAGS_SESSION_REPLY2_SEEN 0x0040
164 #define FLAGS_BULK_IN_ACTIVE 0x0020
165 #define FLAGS_BULK_IN_RESTART 0x0010
166 #define FLAGS_THROTTLED 0x0008
167 #define APP_REQ_SEEN 0x0004
168 #define APP_RESP_SEEN 0x0002
169 #define CLEAR_HALT_REQUIRED 0x0001
170
171 #define FLAGS_QUEUING 0x0100
172 #define FLAGS_DROP_DATA 0x0800
173
174 #define FLAGS_GSP_SKIP 0x1000
175 #define FLAGS_GSP_DLESEEN 0x2000
176
177
178
179
180
181
182 /* function prototypes */
183 static int gsp_next_packet(struct garmin_data *garmin_data_p);
184 static int garmin_write_bulk(struct usb_serial_port *port,
185 const unsigned char *buf, int count,
186 int dismiss_ack);
187
188 /* some special packets to be send or received */
189 static unsigned char const GARMIN_START_SESSION_REQ[]
190 = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 };
191 static unsigned char const GARMIN_START_SESSION_REPLY[]
192 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
193 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
194 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
195 static unsigned char const GARMIN_APP_LAYER_REPLY[]
196 = { 0x14, 0, 0, 0 };
197 static unsigned char const GARMIN_START_PVT_REQ[]
198 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
199 static unsigned char const GARMIN_STOP_PVT_REQ[]
200 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
201 static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
202 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
203 static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
204 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
205 static unsigned char const PRIVATE_REQ[]
206 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
207
208
209
210 static const struct usb_device_id id_table[] = {
211 /* the same device id seems to be used by all
212 usb enabled GPS devices */
213 { USB_DEVICE(GARMIN_VENDOR_ID, 3) },
214 { } /* Terminating entry */
215 };
216 MODULE_DEVICE_TABLE(usb, id_table);
217
218
219 static inline int getLayerId(const __u8 *usbPacket)
220 {
221 return __le32_to_cpup((__le32 *)(usbPacket));
222 }
223
224 static inline int getPacketId(const __u8 *usbPacket)
225 {
226 return __le32_to_cpup((__le32 *)(usbPacket+4));
227 }
228
229 static inline int getDataLength(const __u8 *usbPacket)
230 {
231 return __le32_to_cpup((__le32 *)(usbPacket+8));
232 }
233
234
235 /*
236 * check if the usb-packet in buf contains an abort-transfer command.
237 * (if yes, all queued data will be dropped)
238 */
239 static inline int isAbortTrfCmnd(const unsigned char *buf)
240 {
241 if (0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
242 sizeof(GARMIN_STOP_TRANSFER_REQ)) ||
243 0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
244 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)))
245 return 1;
246 else
247 return 0;
248 }
249
250
251
252 static void send_to_tty(struct usb_serial_port *port,
253 char *data, unsigned int actual_length)
254 {
255 if (actual_length) {
256 usb_serial_debug_data(&port->dev, __func__, actual_length, data);
257 tty_insert_flip_string(&port->port, data, actual_length);
258 tty_flip_buffer_push(&port->port);
259 }
260 }
261
262
263 /******************************************************************************
264 * packet queue handling
265 ******************************************************************************/
266
267 /*
268 * queue a received (usb-)packet for later processing
269 */
270 static int pkt_add(struct garmin_data *garmin_data_p,
271 unsigned char *data, unsigned int data_length)
272 {
273 int state = 0;
274 int result = 0;
275 unsigned long flags;
276 struct garmin_packet *pkt;
277
278 /* process only packets containg data ... */
279 if (data_length) {
280 pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
281 GFP_ATOMIC);
282 if (pkt == NULL) {
283 dev_err(&garmin_data_p->port->dev, "out of memory\n");
284 return 0;
285 }
286 pkt->size = data_length;
287 memcpy(pkt->data, data, data_length);
288
289 spin_lock_irqsave(&garmin_data_p->lock, flags);
290 garmin_data_p->flags |= FLAGS_QUEUING;
291 result = list_empty(&garmin_data_p->pktlist);
292 pkt->seq = garmin_data_p->seq_counter++;
293 list_add_tail(&pkt->list, &garmin_data_p->pktlist);
294 state = garmin_data_p->state;
295 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
296
297 dev_dbg(&garmin_data_p->port->dev,
298 "%s - added: pkt: %d - %d bytes\n", __func__,
299 pkt->seq, data_length);
300
301 /* in serial mode, if someone is waiting for data from
302 the device, convert and send the next packet to tty. */
303 if (result && (state == STATE_GSP_WAIT_DATA))
304 gsp_next_packet(garmin_data_p);
305 }
306 return result;
307 }
308
309
310 /* get the next pending packet */
311 static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p)
312 {
313 unsigned long flags;
314 struct garmin_packet *result = NULL;
315
316 spin_lock_irqsave(&garmin_data_p->lock, flags);
317 if (!list_empty(&garmin_data_p->pktlist)) {
318 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
319 list_del(&result->list);
320 }
321 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
322 return result;
323 }
324
325
326 /* free up all queued data */
327 static void pkt_clear(struct garmin_data *garmin_data_p)
328 {
329 unsigned long flags;
330 struct garmin_packet *result = NULL;
331
332 spin_lock_irqsave(&garmin_data_p->lock, flags);
333 while (!list_empty(&garmin_data_p->pktlist)) {
334 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
335 list_del(&result->list);
336 kfree(result);
337 }
338 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
339 }
340
341
342 /******************************************************************************
343 * garmin serial protocol handling handling
344 ******************************************************************************/
345
346 /* send an ack packet back to the tty */
347 static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
348 {
349 __u8 pkt[10];
350 __u8 cksum = 0;
351 __u8 *ptr = pkt;
352 unsigned l = 0;
353
354 dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__,
355 0xFF & pkt_id);
356
357 *ptr++ = DLE;
358 *ptr++ = ACK;
359 cksum += ACK;
360
361 *ptr++ = 2;
362 cksum += 2;
363
364 *ptr++ = pkt_id;
365 cksum += pkt_id;
366
367 if (pkt_id == DLE)
368 *ptr++ = DLE;
369
370 *ptr++ = 0;
371 *ptr++ = 0xFF & (-cksum);
372 *ptr++ = DLE;
373 *ptr++ = ETX;
374
375 l = ptr-pkt;
376
377 send_to_tty(garmin_data_p->port, pkt, l);
378 return 0;
379 }
380
381
382
383 /*
384 * called for a complete packet received from tty layer
385 *
386 * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
387 * at GSP_INITIAL_OFFSET.
388 *
389 * count - number of bytes in the input buffer including space reserved for
390 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
391 * (including pkt-id, data-length a. cksum)
392 */
393 static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
394 {
395 struct device *dev = &garmin_data_p->port->dev;
396 unsigned long flags;
397 const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
398 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
399 int cksum = 0;
400 int n = 0;
401 int pktid = recpkt[0];
402 int size = recpkt[1];
403
404 usb_serial_debug_data(&garmin_data_p->port->dev, __func__,
405 count-GSP_INITIAL_OFFSET, recpkt);
406
407 if (size != (count-GSP_INITIAL_OFFSET-3)) {
408 dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n",
409 __func__, size, (count-GSP_INITIAL_OFFSET-3));
410 return -EINVPKT;
411 }
412
413 cksum += *recpkt++;
414 cksum += *recpkt++;
415
416 /* sanity check, remove after test ... */
417 if ((__u8 *)&(usbdata[3]) != recpkt) {
418 dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__,
419 &(usbdata[4]), recpkt);
420 return -EINVPKT;
421 }
422
423 while (n < size) {
424 cksum += *recpkt++;
425 n++;
426 }
427
428 if ((0xff & (cksum + *recpkt)) != 0) {
429 dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n",
430 __func__, 0xff & -cksum, 0xff & *recpkt);
431 return -EINVPKT;
432 }
433
434 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
435 usbdata[1] = __cpu_to_le32(pktid);
436 usbdata[2] = __cpu_to_le32(size);
437
438 garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
439 GARMIN_PKTHDR_LENGTH+size, 0);
440
441 /* if this was an abort-transfer command, flush all
442 queued data. */
443 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
444 spin_lock_irqsave(&garmin_data_p->lock, flags);
445 garmin_data_p->flags |= FLAGS_DROP_DATA;
446 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
447 pkt_clear(garmin_data_p);
448 }
449
450 return count;
451 }
452
453
454
455 /*
456 * Called for data received from tty
457 *
458 * buf contains the data read, it may span more than one packet or even
459 * incomplete packets
460 *
461 * input record should be a serial-record, but it may not be complete.
462 * Copy it into our local buffer, until an etx is seen (or an error
463 * occurs).
464 * Once the record is complete, convert into a usb packet and send it
465 * to the bulk pipe, send an ack back to the tty.
466 *
467 * If the input is an ack, just send the last queued packet to the
468 * tty layer.
469 *
470 * if the input is an abort command, drop all queued data.
471 */
472
473 static int gsp_receive(struct garmin_data *garmin_data_p,
474 const unsigned char *buf, int count)
475 {
476 struct device *dev = &garmin_data_p->port->dev;
477 unsigned long flags;
478 int offs = 0;
479 int ack_or_nak_seen = 0;
480 __u8 *dest;
481 int size;
482 /* dleSeen: set if last byte read was a DLE */
483 int dleSeen;
484 /* skip: if set, skip incoming data until possible start of
485 * new packet
486 */
487 int skip;
488 __u8 data;
489
490 spin_lock_irqsave(&garmin_data_p->lock, flags);
491 dest = garmin_data_p->inbuffer;
492 size = garmin_data_p->insize;
493 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
494 skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
495 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
496
497 /* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n",
498 __func__, dleSeen, skip, size, count); */
499
500 if (size == 0)
501 size = GSP_INITIAL_OFFSET;
502
503 while (offs < count) {
504
505 data = *(buf+offs);
506 offs++;
507
508 if (data == DLE) {
509 if (skip) { /* start of a new pkt */
510 skip = 0;
511 size = GSP_INITIAL_OFFSET;
512 dleSeen = 1;
513 } else if (dleSeen) {
514 dest[size++] = data;
515 dleSeen = 0;
516 } else {
517 dleSeen = 1;
518 }
519 } else if (data == ETX) {
520 if (dleSeen) {
521 /* packet complete */
522
523 data = dest[GSP_INITIAL_OFFSET];
524
525 if (data == ACK) {
526 ack_or_nak_seen = ACK;
527 dev_dbg(dev, "ACK packet complete.\n");
528 } else if (data == NAK) {
529 ack_or_nak_seen = NAK;
530 dev_dbg(dev, "NAK packet complete.\n");
531 } else {
532 dev_dbg(dev, "packet complete - id=0x%X.\n",
533 0xFF & data);
534 gsp_rec_packet(garmin_data_p, size);
535 }
536
537 skip = 1;
538 size = GSP_INITIAL_OFFSET;
539 dleSeen = 0;
540 } else {
541 dest[size++] = data;
542 }
543 } else if (!skip) {
544
545 if (dleSeen) {
546 size = GSP_INITIAL_OFFSET;
547 dleSeen = 0;
548 }
549
550 dest[size++] = data;
551 }
552
553 if (size >= GPS_IN_BUFSIZ) {
554 dev_dbg(dev, "%s - packet too large.\n", __func__);
555 skip = 1;
556 size = GSP_INITIAL_OFFSET;
557 dleSeen = 0;
558 }
559 }
560
561 spin_lock_irqsave(&garmin_data_p->lock, flags);
562
563 garmin_data_p->insize = size;
564
565 /* copy flags back to structure */
566 if (skip)
567 garmin_data_p->flags |= FLAGS_GSP_SKIP;
568 else
569 garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
570
571 if (dleSeen)
572 garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
573 else
574 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
575
576 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
577
578 if (ack_or_nak_seen) {
579 if (gsp_next_packet(garmin_data_p) > 0)
580 garmin_data_p->state = STATE_ACTIVE;
581 else
582 garmin_data_p->state = STATE_GSP_WAIT_DATA;
583 }
584 return count;
585 }
586
587
588
589 /*
590 * Sends a usb packet to the tty
591 *
592 * Assumes, that all packages and at an usb-packet boundary.
593 *
594 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
595 */
596 static int gsp_send(struct garmin_data *garmin_data_p,
597 const unsigned char *buf, int count)
598 {
599 struct device *dev = &garmin_data_p->port->dev;
600 const unsigned char *src;
601 unsigned char *dst;
602 int pktid = 0;
603 int datalen = 0;
604 int cksum = 0;
605 int i = 0;
606 int k;
607
608 dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__,
609 garmin_data_p->state, count);
610
611 k = garmin_data_p->outsize;
612 if ((k+count) > GPS_OUT_BUFSIZ) {
613 dev_dbg(dev, "packet too large\n");
614 garmin_data_p->outsize = 0;
615 return -4;
616 }
617
618 memcpy(garmin_data_p->outbuffer+k, buf, count);
619 k += count;
620 garmin_data_p->outsize = k;
621
622 if (k >= GARMIN_PKTHDR_LENGTH) {
623 pktid = getPacketId(garmin_data_p->outbuffer);
624 datalen = getDataLength(garmin_data_p->outbuffer);
625 i = GARMIN_PKTHDR_LENGTH + datalen;
626 if (k < i)
627 return 0;
628 } else {
629 return 0;
630 }
631
632 dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i);
633
634 /* garmin_data_p->outbuffer now contains a complete packet */
635
636 usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k,
637 garmin_data_p->outbuffer);
638
639 garmin_data_p->outsize = 0;
640
641 if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
642 dev_dbg(dev, "not an application packet (%d)\n",
643 getLayerId(garmin_data_p->outbuffer));
644 return -1;
645 }
646
647 if (pktid > 255) {
648 dev_dbg(dev, "packet-id %d too large\n", pktid);
649 return -2;
650 }
651
652 if (datalen > 255) {
653 dev_dbg(dev, "packet-size %d too large\n", datalen);
654 return -3;
655 }
656
657 /* the serial protocol should be able to handle this packet */
658
659 k = 0;
660 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
661 for (i = 0; i < datalen; i++) {
662 if (*src++ == DLE)
663 k++;
664 }
665
666 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
667 if (k > (GARMIN_PKTHDR_LENGTH-2)) {
668 /* can't add stuffing DLEs in place, move data to end
669 of buffer ... */
670 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
671 memcpy(dst, src, datalen);
672 src = dst;
673 }
674
675 dst = garmin_data_p->outbuffer;
676
677 *dst++ = DLE;
678 *dst++ = pktid;
679 cksum += pktid;
680 *dst++ = datalen;
681 cksum += datalen;
682 if (datalen == DLE)
683 *dst++ = DLE;
684
685 for (i = 0; i < datalen; i++) {
686 __u8 c = *src++;
687 *dst++ = c;
688 cksum += c;
689 if (c == DLE)
690 *dst++ = DLE;
691 }
692
693 cksum = 0xFF & -cksum;
694 *dst++ = cksum;
695 if (cksum == DLE)
696 *dst++ = DLE;
697 *dst++ = DLE;
698 *dst++ = ETX;
699
700 i = dst-garmin_data_p->outbuffer;
701
702 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
703
704 garmin_data_p->pkt_id = pktid;
705 garmin_data_p->state = STATE_WAIT_TTY_ACK;
706
707 return i;
708 }
709
710
711 /*
712 * Process the next pending data packet - if there is one
713 */
714 static int gsp_next_packet(struct garmin_data *garmin_data_p)
715 {
716 int result = 0;
717 struct garmin_packet *pkt = NULL;
718
719 while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
720 dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq);
721 result = gsp_send(garmin_data_p, pkt->data, pkt->size);
722 if (result > 0) {
723 kfree(pkt);
724 return result;
725 }
726 kfree(pkt);
727 }
728 return result;
729 }
730
731
732
733 /******************************************************************************
734 * garmin native mode
735 ******************************************************************************/
736
737
738 /*
739 * Called for data received from tty
740 *
741 * The input data is expected to be in garmin usb-packet format.
742 *
743 * buf contains the data read, it may span more than one packet
744 * or even incomplete packets
745 */
746 static int nat_receive(struct garmin_data *garmin_data_p,
747 const unsigned char *buf, int count)
748 {
749 unsigned long flags;
750 __u8 *dest;
751 int offs = 0;
752 int result = count;
753 int len;
754
755 while (offs < count) {
756 /* if buffer contains header, copy rest of data */
757 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
758 len = GARMIN_PKTHDR_LENGTH
759 +getDataLength(garmin_data_p->inbuffer);
760 else
761 len = GARMIN_PKTHDR_LENGTH;
762
763 if (len >= GPS_IN_BUFSIZ) {
764 /* seems to be an invalid packet, ignore rest
765 of input */
766 dev_dbg(&garmin_data_p->port->dev,
767 "%s - packet size too large: %d\n",
768 __func__, len);
769 garmin_data_p->insize = 0;
770 count = 0;
771 result = -EINVPKT;
772 } else {
773 len -= garmin_data_p->insize;
774 if (len > (count-offs))
775 len = (count-offs);
776 if (len > 0) {
777 dest = garmin_data_p->inbuffer
778 + garmin_data_p->insize;
779 memcpy(dest, buf+offs, len);
780 garmin_data_p->insize += len;
781 offs += len;
782 }
783 }
784
785 /* do we have a complete packet ? */
786 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
787 len = GARMIN_PKTHDR_LENGTH+
788 getDataLength(garmin_data_p->inbuffer);
789 if (garmin_data_p->insize >= len) {
790 garmin_write_bulk(garmin_data_p->port,
791 garmin_data_p->inbuffer,
792 len, 0);
793 garmin_data_p->insize = 0;
794
795 /* if this was an abort-transfer command,
796 flush all queued data. */
797 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
798 spin_lock_irqsave(&garmin_data_p->lock,
799 flags);
800 garmin_data_p->flags |= FLAGS_DROP_DATA;
801 spin_unlock_irqrestore(
802 &garmin_data_p->lock, flags);
803 pkt_clear(garmin_data_p);
804 }
805 }
806 }
807 }
808 return result;
809 }
810
811
812 /******************************************************************************
813 * private packets
814 ******************************************************************************/
815
816 static void priv_status_resp(struct usb_serial_port *port)
817 {
818 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
819 __le32 *pkt = (__le32 *)garmin_data_p->privpkt;
820
821 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
822 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
823 pkt[2] = __cpu_to_le32(12);
824 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
825 pkt[4] = __cpu_to_le32(garmin_data_p->mode);
826 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
827
828 send_to_tty(port, (__u8 *)pkt, 6 * 4);
829 }
830
831
832 /******************************************************************************
833 * Garmin specific driver functions
834 ******************************************************************************/
835
836 static int process_resetdev_request(struct usb_serial_port *port)
837 {
838 unsigned long flags;
839 int status;
840 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
841
842 spin_lock_irqsave(&garmin_data_p->lock, flags);
843 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
844 garmin_data_p->state = STATE_RESET;
845 garmin_data_p->serial_num = 0;
846 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
847
848 usb_kill_urb(port->interrupt_in_urb);
849 dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__);
850 status = usb_reset_device(port->serial->dev);
851 if (status)
852 dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n",
853 __func__, status);
854 return status;
855 }
856
857
858
859 /*
860 * clear all cached data
861 */
862 static int garmin_clear(struct garmin_data *garmin_data_p)
863 {
864 unsigned long flags;
865 int status = 0;
866
867 /* flush all queued data */
868 pkt_clear(garmin_data_p);
869
870 spin_lock_irqsave(&garmin_data_p->lock, flags);
871 garmin_data_p->insize = 0;
872 garmin_data_p->outsize = 0;
873 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
874
875 return status;
876 }
877
878
879 static int garmin_init_session(struct usb_serial_port *port)
880 {
881 struct usb_serial *serial = port->serial;
882 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
883 int status = 0;
884 int i = 0;
885
886 if (status == 0) {
887 usb_kill_urb(port->interrupt_in_urb);
888
889 dev_dbg(&serial->dev->dev, "%s - adding interrupt input\n", __func__);
890 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
891 if (status)
892 dev_err(&serial->dev->dev,
893 "%s - failed submitting interrupt urb, error %d\n",
894 __func__, status);
895 }
896
897 /*
898 * using the initialization method from gpsbabel. See comments in
899 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
900 */
901 if (status == 0) {
902 dev_dbg(&serial->dev->dev, "%s - starting session ...\n", __func__);
903 garmin_data_p->state = STATE_ACTIVE;
904
905 for (i = 0; i < 3; i++) {
906 status = garmin_write_bulk(port,
907 GARMIN_START_SESSION_REQ,
908 sizeof(GARMIN_START_SESSION_REQ), 0);
909
910 if (status < 0)
911 break;
912 }
913
914 if (status > 0)
915 status = 0;
916 }
917
918 return status;
919 }
920
921
922
923 static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
924 {
925 unsigned long flags;
926 int status = 0;
927 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
928
929 spin_lock_irqsave(&garmin_data_p->lock, flags);
930 garmin_data_p->mode = initial_mode;
931 garmin_data_p->count = 0;
932 garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
933 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
934
935 /* shutdown any bulk reads that might be going on */
936 usb_kill_urb(port->write_urb);
937 usb_kill_urb(port->read_urb);
938
939 if (garmin_data_p->state == STATE_RESET)
940 status = garmin_init_session(port);
941
942 garmin_data_p->state = STATE_ACTIVE;
943 return status;
944 }
945
946
947 static void garmin_close(struct usb_serial_port *port)
948 {
949 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
950
951 dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n",
952 __func__, garmin_data_p->mode, garmin_data_p->state,
953 garmin_data_p->flags);
954
955 garmin_clear(garmin_data_p);
956
957 /* shutdown our urbs */
958 usb_kill_urb(port->read_urb);
959 usb_kill_urb(port->write_urb);
960
961 /* keep reset state so we know that we must start a new session */
962 if (garmin_data_p->state != STATE_RESET)
963 garmin_data_p->state = STATE_DISCONNECTED;
964 }
965
966
967 static void garmin_write_bulk_callback(struct urb *urb)
968 {
969 struct usb_serial_port *port = urb->context;
970
971 if (port) {
972 struct garmin_data *garmin_data_p =
973 usb_get_serial_port_data(port);
974
975 if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)) {
976
977 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
978 gsp_send_ack(garmin_data_p,
979 ((__u8 *)urb->transfer_buffer)[4]);
980 }
981 }
982 usb_serial_port_softint(port);
983 }
984
985 /* Ignore errors that resulted from garmin_write_bulk with
986 dismiss_ack = 1 */
987
988 /* free up the transfer buffer, as usb_free_urb() does not do this */
989 kfree(urb->transfer_buffer);
990 }
991
992
993 static int garmin_write_bulk(struct usb_serial_port *port,
994 const unsigned char *buf, int count,
995 int dismiss_ack)
996 {
997 unsigned long flags;
998 struct usb_serial *serial = port->serial;
999 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1000 struct urb *urb;
1001 unsigned char *buffer;
1002 int status;
1003
1004 spin_lock_irqsave(&garmin_data_p->lock, flags);
1005 garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1006 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1007
1008 buffer = kmalloc(count, GFP_ATOMIC);
1009 if (!buffer) {
1010 dev_err(&port->dev, "out of memory\n");
1011 return -ENOMEM;
1012 }
1013
1014 urb = usb_alloc_urb(0, GFP_ATOMIC);
1015 if (!urb) {
1016 dev_err(&port->dev, "no more free urbs\n");
1017 kfree(buffer);
1018 return -ENOMEM;
1019 }
1020
1021 memcpy(buffer, buf, count);
1022
1023 usb_serial_debug_data(&port->dev, __func__, count, buffer);
1024
1025 usb_fill_bulk_urb(urb, serial->dev,
1026 usb_sndbulkpipe(serial->dev,
1027 port->bulk_out_endpointAddress),
1028 buffer, count,
1029 garmin_write_bulk_callback,
1030 dismiss_ack ? NULL : port);
1031 urb->transfer_flags |= URB_ZERO_PACKET;
1032
1033 if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
1034
1035 spin_lock_irqsave(&garmin_data_p->lock, flags);
1036 garmin_data_p->flags |= APP_REQ_SEEN;
1037 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1038
1039 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1040 pkt_clear(garmin_data_p);
1041 garmin_data_p->state = STATE_GSP_WAIT_DATA;
1042 }
1043 }
1044
1045 /* send it down the pipe */
1046 status = usb_submit_urb(urb, GFP_ATOMIC);
1047 if (status) {
1048 dev_err(&port->dev,
1049 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
1050 __func__, status);
1051 count = status;
1052 }
1053
1054 /* we are done with this urb, so let the host driver
1055 * really free it when it is finished with it */
1056 usb_free_urb(urb);
1057
1058 return count;
1059 }
1060
1061 static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
1062 const unsigned char *buf, int count)
1063 {
1064 struct device *dev = &port->dev;
1065 int pktid, pktsiz, len;
1066 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1067 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1068
1069 usb_serial_debug_data(dev, __func__, count, buf);
1070
1071 if (garmin_data_p->state == STATE_RESET)
1072 return -EIO;
1073
1074 /* check for our private packets */
1075 if (count >= GARMIN_PKTHDR_LENGTH) {
1076 len = PRIVPKTSIZ;
1077 if (count < len)
1078 len = count;
1079
1080 memcpy(garmin_data_p->privpkt, buf, len);
1081
1082 pktsiz = getDataLength(garmin_data_p->privpkt);
1083 pktid = getPacketId(garmin_data_p->privpkt);
1084
1085 if (count == (GARMIN_PKTHDR_LENGTH+pktsiz)
1086 && GARMIN_LAYERID_PRIVATE ==
1087 getLayerId(garmin_data_p->privpkt)) {
1088
1089 dev_dbg(dev, "%s - processing private request %d\n",
1090 __func__, pktid);
1091
1092 /* drop all unfinished transfers */
1093 garmin_clear(garmin_data_p);
1094
1095 switch (pktid) {
1096 case PRIV_PKTID_SET_MODE:
1097 if (pktsiz != 4)
1098 return -EINVPKT;
1099 garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1100 dev_dbg(dev, "%s - mode set to %d\n",
1101 __func__, garmin_data_p->mode);
1102 break;
1103
1104 case PRIV_PKTID_INFO_REQ:
1105 priv_status_resp(port);
1106 break;
1107
1108 case PRIV_PKTID_RESET_REQ:
1109 process_resetdev_request(port);
1110 break;
1111
1112 case PRIV_PKTID_SET_DEF_MODE:
1113 if (pktsiz != 4)
1114 return -EINVPKT;
1115 initial_mode = __le32_to_cpu(privpkt[3]);
1116 dev_dbg(dev, "%s - initial_mode set to %d\n",
1117 __func__,
1118 garmin_data_p->mode);
1119 break;
1120 }
1121 return count;
1122 }
1123 }
1124
1125 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1126 return gsp_receive(garmin_data_p, buf, count);
1127 } else { /* MODE_NATIVE */
1128 return nat_receive(garmin_data_p, buf, count);
1129 }
1130 }
1131
1132
1133 static int garmin_write_room(struct tty_struct *tty)
1134 {
1135 struct usb_serial_port *port = tty->driver_data;
1136 /*
1137 * Report back the bytes currently available in the output buffer.
1138 */
1139 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1140 return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1141 }
1142
1143
1144 static void garmin_read_process(struct garmin_data *garmin_data_p,
1145 unsigned char *data, unsigned data_length,
1146 int bulk_data)
1147 {
1148 unsigned long flags;
1149
1150 if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1151 /* abort-transfer cmd is actice */
1152 dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__);
1153 } else if (garmin_data_p->state != STATE_DISCONNECTED &&
1154 garmin_data_p->state != STATE_RESET) {
1155
1156 /* if throttling is active or postprecessing is required
1157 put the received data in the input queue, otherwise
1158 send it directly to the tty port */
1159 if (garmin_data_p->flags & FLAGS_QUEUING) {
1160 pkt_add(garmin_data_p, data, data_length);
1161 } else if (bulk_data ||
1162 getLayerId(data) == GARMIN_LAYERID_APPL) {
1163
1164 spin_lock_irqsave(&garmin_data_p->lock, flags);
1165 garmin_data_p->flags |= APP_RESP_SEEN;
1166 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1167
1168 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1169 pkt_add(garmin_data_p, data, data_length);
1170 } else {
1171 send_to_tty(garmin_data_p->port, data,
1172 data_length);
1173 }
1174 }
1175 /* ignore system layer packets ... */
1176 }
1177 }
1178
1179
1180 static void garmin_read_bulk_callback(struct urb *urb)
1181 {
1182 unsigned long flags;
1183 struct usb_serial_port *port = urb->context;
1184 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1185 unsigned char *data = urb->transfer_buffer;
1186 int status = urb->status;
1187 int retval;
1188
1189 if (status) {
1190 dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n",
1191 __func__, status);
1192 return;
1193 }
1194
1195 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1196
1197 garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
1198
1199 if (urb->actual_length == 0 &&
1200 0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
1201 spin_lock_irqsave(&garmin_data_p->lock, flags);
1202 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1203 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1204 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1205 if (retval)
1206 dev_err(&port->dev,
1207 "%s - failed resubmitting read urb, error %d\n",
1208 __func__, retval);
1209 } else if (urb->actual_length > 0) {
1210 /* Continue trying to read until nothing more is received */
1211 if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
1212 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1213 if (retval)
1214 dev_err(&port->dev,
1215 "%s - failed resubmitting read urb, error %d\n",
1216 __func__, retval);
1217 }
1218 } else {
1219 dev_dbg(&port->dev, "%s - end of bulk data\n", __func__);
1220 spin_lock_irqsave(&garmin_data_p->lock, flags);
1221 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1222 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1223 }
1224 }
1225
1226
1227 static void garmin_read_int_callback(struct urb *urb)
1228 {
1229 unsigned long flags;
1230 int retval;
1231 struct usb_serial_port *port = urb->context;
1232 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1233 unsigned char *data = urb->transfer_buffer;
1234 int status = urb->status;
1235
1236 switch (status) {
1237 case 0:
1238 /* success */
1239 break;
1240 case -ECONNRESET:
1241 case -ENOENT:
1242 case -ESHUTDOWN:
1243 /* this urb is terminated, clean up */
1244 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
1245 __func__, status);
1246 return;
1247 default:
1248 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
1249 __func__, status);
1250 return;
1251 }
1252
1253 usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
1254 urb->transfer_buffer);
1255
1256 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1257 0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1258 sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
1259
1260 dev_dbg(&port->dev, "%s - bulk data available.\n", __func__);
1261
1262 if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1263
1264 /* bulk data available */
1265 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1266 if (retval) {
1267 dev_err(&port->dev,
1268 "%s - failed submitting read urb, error %d\n",
1269 __func__, retval);
1270 } else {
1271 spin_lock_irqsave(&garmin_data_p->lock, flags);
1272 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1273 spin_unlock_irqrestore(&garmin_data_p->lock,
1274 flags);
1275 }
1276 } else {
1277 /* bulk-in transfer still active */
1278 spin_lock_irqsave(&garmin_data_p->lock, flags);
1279 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1280 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1281 }
1282
1283 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1284 && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
1285 sizeof(GARMIN_START_SESSION_REPLY))) {
1286
1287 spin_lock_irqsave(&garmin_data_p->lock, flags);
1288 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1289 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1290
1291 /* save the serial number */
1292 garmin_data_p->serial_num = __le32_to_cpup(
1293 (__le32 *)(data+GARMIN_PKTHDR_LENGTH));
1294
1295 dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n",
1296 __func__, garmin_data_p->serial_num);
1297 }
1298
1299 garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
1300
1301 retval = usb_submit_urb(urb, GFP_ATOMIC);
1302 if (retval)
1303 dev_err(&urb->dev->dev,
1304 "%s - Error %d submitting interrupt urb\n",
1305 __func__, retval);
1306 }
1307
1308
1309 /*
1310 * Sends the next queued packt to the tty port (garmin native mode only)
1311 * and then sets a timer to call itself again until all queued data
1312 * is sent.
1313 */
1314 static int garmin_flush_queue(struct garmin_data *garmin_data_p)
1315 {
1316 unsigned long flags;
1317 struct garmin_packet *pkt;
1318
1319 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1320 pkt = pkt_pop(garmin_data_p);
1321 if (pkt != NULL) {
1322 send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1323 kfree(pkt);
1324 mod_timer(&garmin_data_p->timer, (1)+jiffies);
1325
1326 } else {
1327 spin_lock_irqsave(&garmin_data_p->lock, flags);
1328 garmin_data_p->flags &= ~FLAGS_QUEUING;
1329 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1330 }
1331 }
1332 return 0;
1333 }
1334
1335
1336 static void garmin_throttle(struct tty_struct *tty)
1337 {
1338 struct usb_serial_port *port = tty->driver_data;
1339 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1340
1341 /* set flag, data received will be put into a queue
1342 for later processing */
1343 spin_lock_irq(&garmin_data_p->lock);
1344 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1345 spin_unlock_irq(&garmin_data_p->lock);
1346 }
1347
1348
1349 static void garmin_unthrottle(struct tty_struct *tty)
1350 {
1351 struct usb_serial_port *port = tty->driver_data;
1352 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1353 int status;
1354
1355 spin_lock_irq(&garmin_data_p->lock);
1356 garmin_data_p->flags &= ~FLAGS_THROTTLED;
1357 spin_unlock_irq(&garmin_data_p->lock);
1358
1359 /* in native mode send queued data to tty, in
1360 serial mode nothing needs to be done here */
1361 if (garmin_data_p->mode == MODE_NATIVE)
1362 garmin_flush_queue(garmin_data_p);
1363
1364 if (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1365 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1366 if (status)
1367 dev_err(&port->dev,
1368 "%s - failed resubmitting read urb, error %d\n",
1369 __func__, status);
1370 }
1371 }
1372
1373 /*
1374 * The timer is currently only used to send queued packets to
1375 * the tty in cases where the protocol provides no own handshaking
1376 * to initiate the transfer.
1377 */
1378 static void timeout_handler(unsigned long data)
1379 {
1380 struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1381
1382 /* send the next queued packet to the tty port */
1383 if (garmin_data_p->mode == MODE_NATIVE)
1384 if (garmin_data_p->flags & FLAGS_QUEUING)
1385 garmin_flush_queue(garmin_data_p);
1386 }
1387
1388
1389
1390 static int garmin_port_probe(struct usb_serial_port *port)
1391 {
1392 int status;
1393 struct garmin_data *garmin_data_p;
1394
1395 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1396 if (garmin_data_p == NULL) {
1397 dev_err(&port->dev, "%s - Out of memory\n", __func__);
1398 return -ENOMEM;
1399 }
1400 init_timer(&garmin_data_p->timer);
1401 spin_lock_init(&garmin_data_p->lock);
1402 INIT_LIST_HEAD(&garmin_data_p->pktlist);
1403 /* garmin_data_p->timer.expires = jiffies + session_timeout; */
1404 garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1405 garmin_data_p->timer.function = timeout_handler;
1406 garmin_data_p->port = port;
1407 garmin_data_p->state = 0;
1408 garmin_data_p->flags = 0;
1409 garmin_data_p->count = 0;
1410 usb_set_serial_port_data(port, garmin_data_p);
1411
1412 status = garmin_init_session(port);
1413
1414 return status;
1415 }
1416
1417
1418 static int garmin_port_remove(struct usb_serial_port *port)
1419 {
1420 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1421
1422 usb_kill_urb(port->interrupt_in_urb);
1423 del_timer_sync(&garmin_data_p->timer);
1424 kfree(garmin_data_p);
1425 return 0;
1426 }
1427
1428
1429 /* All of the device info needed */
1430 static struct usb_serial_driver garmin_device = {
1431 .driver = {
1432 .owner = THIS_MODULE,
1433 .name = "garmin_gps",
1434 },
1435 .description = "Garmin GPS usb/tty",
1436 .id_table = id_table,
1437 .num_ports = 1,
1438 .open = garmin_open,
1439 .close = garmin_close,
1440 .throttle = garmin_throttle,
1441 .unthrottle = garmin_unthrottle,
1442 .port_probe = garmin_port_probe,
1443 .port_remove = garmin_port_remove,
1444 .write = garmin_write,
1445 .write_room = garmin_write_room,
1446 .write_bulk_callback = garmin_write_bulk_callback,
1447 .read_bulk_callback = garmin_read_bulk_callback,
1448 .read_int_callback = garmin_read_int_callback,
1449 };
1450
1451 static struct usb_serial_driver * const serial_drivers[] = {
1452 &garmin_device, NULL
1453 };
1454
1455 module_usb_serial_driver(serial_drivers, id_table);
1456
1457 MODULE_AUTHOR(DRIVER_AUTHOR);
1458 MODULE_DESCRIPTION(DRIVER_DESC);
1459 MODULE_LICENSE("GPL");
1460
1461 module_param(initial_mode, int, S_IRUGO);
1462 MODULE_PARM_DESC(initial_mode, "Initial mode");
Linux with added FPC-III support