4 * Copyright (C) 2006 Hermann Kneissel herkne@users.sourceforge.net
6 * The latest version of the driver can be found at
7 * http://sourceforge.net/projects/garmin-gps/
9 * This driver has been derived from v2.1 of the visor driver.
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.
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.
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
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 <asm/uaccess.h>
37 #include <linux/usb.h>
38 #include <linux/usb/serial.h>
40 #include <linux/version.h>
42 /* the mode to be set when the port ist opened */
43 static int initial_mode = 1;
48 #define GARMIN_VENDOR_ID 0x091E
54 #define VERSION_MAJOR 0
55 #define VERSION_MINOR 28
58 #define _DRIVER_VERSION(a,b) "v" _STR(a) "." _STR(b)
59 #define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
60 #define DRIVER_AUTHOR "hermann kneissel"
61 #define DRIVER_DESC "garmin gps driver"
63 /* error codes returned by the driver */
64 #define EINVPKT 1000 /* invalid packet structure */
67 // size of the header of a packet using the usb protocol
68 #define GARMIN_PKTHDR_LENGTH 12
70 // max. possible size of a packet using the serial protocol
71 #define MAX_SERIAL_PKT_SIZ (3+255+3)
73 // max. possible size of a packet with worst case stuffing
74 #define MAX_SERIAL_PKT_SIZ_STUFFED MAX_SERIAL_PKT_SIZ+256
76 // size of a buffer able to hold a complete (no stuffing) packet
77 // (the document protocol does not contain packets with a larger
78 // size, but in theory a packet may be 64k+12 bytes - if in
79 // later protocol versions larger packet sizes occur, this value
80 // should be increased accordingly, so the input buffer is always
81 // large enough the store a complete packet inclusive header)
82 #define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
84 // size of a buffer able to hold a complete (incl. stuffing) packet
85 #define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
87 // where to place the packet id of a serial packet, so we can
88 // prepend the usb-packet header without the need to move the
90 #define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
92 // max. size of incoming private packets (header+1 param)
93 #define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
95 #define GARMIN_LAYERID_TRANSPORT 0
96 #define GARMIN_LAYERID_APPL 20
97 // our own layer-id to use for some control mechanisms
98 #define GARMIN_LAYERID_PRIVATE 0x01106E4B
100 #define GARMIN_PKTID_PVT_DATA 51
101 #define GARMIN_PKTID_L001_COMMAND_DATA 10
103 #define CMND_ABORT_TRANSFER 0
105 // packet ids used in private layer
106 #define PRIV_PKTID_SET_DEBUG 1
107 #define PRIV_PKTID_SET_MODE 2
108 #define PRIV_PKTID_INFO_REQ 3
109 #define PRIV_PKTID_INFO_RESP 4
110 #define PRIV_PKTID_RESET_REQ 5
111 #define PRIV_PKTID_SET_DEF_MODE 6
119 /* structure used to queue incoming packets */
120 struct garmin_packet {
121 struct list_head list;
123 int size; // the real size of the data array, always > 0
127 /* structure used to keep the current state of the driver */
136 struct timer_list timer;
137 struct usb_serial_port *port;
141 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
142 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
145 struct list_head pktlist;
150 #define STATE_INITIAL_DELAY 1
151 #define STATE_TIMEOUT 2
152 #define STATE_SESSION_REQ1 3
153 #define STATE_SESSION_REQ2 4
154 #define STATE_ACTIVE 5
156 #define STATE_RESET 8
157 #define STATE_DISCONNECTED 9
158 #define STATE_WAIT_TTY_ACK 10
159 #define STATE_GSP_WAIT_DATA 11
161 #define MODE_NATIVE 0
162 #define MODE_GARMIN_SERIAL 1
164 // Flags used in garmin_data.flags:
165 #define FLAGS_SESSION_REPLY_MASK 0x00C0
166 #define FLAGS_SESSION_REPLY1_SEEN 0x0080
167 #define FLAGS_SESSION_REPLY2_SEEN 0x0040
168 #define FLAGS_BULK_IN_ACTIVE 0x0020
169 #define FLAGS_BULK_IN_RESTART 0x0010
170 #define FLAGS_THROTTLED 0x0008
171 #define CLEAR_HALT_REQUIRED 0x0001
173 #define FLAGS_QUEUING 0x0100
174 #define FLAGS_APP_RESP_SEEN 0x0200
175 #define FLAGS_APP_REQ_SEEN 0x0400
176 #define FLAGS_DROP_DATA 0x0800
178 #define FLAGS_GSP_SKIP 0x1000
179 #define FLAGS_GSP_DLESEEN 0x2000
186 /* function prototypes */
187 static void gsp_next_packet(struct garmin_data * garmin_data_p);
188 static int garmin_write_bulk(struct usb_serial_port *port,
189 const unsigned char *buf, int count);
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_REQ2[]
195 = { 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
196 static unsigned char const GARMIN_START_SESSION_REPLY[]
197 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
198 static unsigned char const GARMIN_SESSION_ACTIVE_REPLY[]
199 = { 0, 0, 0, 0, 17, 0, 0, 0, 4, 0, 0, 0, 0, 16, 0, 0 };
200 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
201 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
202 static unsigned char const GARMIN_APP_LAYER_REPLY[]
204 static unsigned char const GARMIN_START_PVT_REQ[]
205 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
206 static unsigned char const GARMIN_STOP_PVT_REQ[]
207 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
208 static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
209 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
210 static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
211 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
212 static unsigned char const PRIVATE_REQ[]
213 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
217 static struct usb_device_id id_table [] = {
218 /* the same device id seems to be used by all usb enabled gps devices */
219 { USB_DEVICE(GARMIN_VENDOR_ID, 3 ) },
220 { } /* Terminating entry */
223 MODULE_DEVICE_TABLE (usb, id_table);
225 static struct usb_driver garmin_driver = {
226 .name = "garmin_gps",
227 .probe = usb_serial_probe,
228 .disconnect = usb_serial_disconnect,
229 .id_table = id_table,
234 static inline int noResponseFromAppLayer(struct garmin_data * garmin_data_p)
236 return ((garmin_data_p->flags
237 & (FLAGS_APP_REQ_SEEN|FLAGS_APP_RESP_SEEN))
238 == FLAGS_APP_REQ_SEEN);
242 static inline int getLayerId(const __u8 *usbPacket)
244 return __le32_to_cpup((__le32 *)(usbPacket));
247 static inline int getPacketId(const __u8 *usbPacket)
249 return __le32_to_cpup((__le32 *)(usbPacket+4));
252 static inline int getDataLength(const __u8 *usbPacket)
254 return __le32_to_cpup((__le32 *)(usbPacket+8));
259 * check if the usb-packet in buf contains an abort-transfer command.
260 * (if yes, all queued data will be dropped)
262 static inline int isAbortTrfCmnd(const unsigned char *buf)
264 if (0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
265 sizeof(GARMIN_STOP_TRANSFER_REQ)) ||
266 0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
267 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)))
275 static void send_to_tty(struct usb_serial_port *port,
276 char *data, unsigned int actual_length)
278 struct tty_struct *tty = port->tty;
280 if (tty && actual_length) {
282 usb_serial_debug_data(debug, &port->dev,
283 __FUNCTION__, actual_length, data);
285 tty_buffer_request_room(tty, actual_length);
286 tty_insert_flip_string(tty, data, actual_length);
287 tty_flip_buffer_push(tty);
292 /******************************************************************************
293 * packet queue handling
294 ******************************************************************************/
297 * queue a received (usb-)packet for later processing
299 static int pkt_add(struct garmin_data * garmin_data_p,
300 unsigned char *data, unsigned int data_length)
305 struct garmin_packet *pkt;
307 /* process only packets containg data ... */
309 pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
312 dev_err(&garmin_data_p->port->dev, "out of memory\n");
315 pkt->size = data_length;
316 memcpy(pkt->data, data, data_length);
318 spin_lock_irqsave(&garmin_data_p->lock, flags);
319 garmin_data_p->flags |= FLAGS_QUEUING;
320 result = list_empty(&garmin_data_p->pktlist);
321 pkt->seq = garmin_data_p->seq_counter++;
322 list_add_tail(&pkt->list, &garmin_data_p->pktlist);
323 state = garmin_data_p->state;
324 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
326 /* in serial mode, if someone is waiting for data from
327 the device, iconvert and send the next packet to tty. */
328 if (result && (state == STATE_GSP_WAIT_DATA)) {
329 gsp_next_packet(garmin_data_p);
336 /* get the next pending packet */
337 static struct garmin_packet *pkt_pop(struct garmin_data * garmin_data_p)
340 struct garmin_packet *result = NULL;
342 spin_lock_irqsave(&garmin_data_p->lock, flags);
343 if (!list_empty(&garmin_data_p->pktlist)) {
344 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
345 list_del(&result->list);
347 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
352 /* free up all queued data */
353 static void pkt_clear(struct garmin_data * garmin_data_p)
356 struct garmin_packet *result = NULL;
358 dbg("%s", __FUNCTION__);
360 spin_lock_irqsave(&garmin_data_p->lock, flags);
361 while (!list_empty(&garmin_data_p->pktlist)) {
362 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
363 list_del(&result->list);
366 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
370 /******************************************************************************
371 * garmin serial protocol handling handling
372 ******************************************************************************/
374 /* send an ack packet back to the tty */
375 static int gsp_send_ack(struct garmin_data * garmin_data_p, __u8 pkt_id)
382 dbg("%s - pkt-id: 0x%X.", __FUNCTION__, 0xFF & pkt_id);
399 *ptr++ = 0xFF & (-cksum);
405 send_to_tty(garmin_data_p->port, pkt, l);
412 * called for a complete packet received from tty layer
414 * the complete packet (pkzid ... cksum) is in garmin_data_p->inbuf starting
415 * at GSP_INITIAL_OFFSET.
417 * count - number of bytes in the input buffer including space reserved for
418 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
419 * (including pkt-id, data-length a. cksum)
421 static int gsp_rec_packet(struct garmin_data * garmin_data_p, int count)
423 const __u8* recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
424 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
428 int pktid = recpkt[0];
429 int size = recpkt[1];
431 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
432 __FUNCTION__, count-GSP_INITIAL_OFFSET, recpkt);
434 if (size != (count-GSP_INITIAL_OFFSET-3)) {
435 dbg("%s - invalid size, expected %d bytes, got %d",
436 __FUNCTION__, size, (count-GSP_INITIAL_OFFSET-3));
443 // sanity check, remove after test ...
444 if ((__u8*)&(usbdata[3]) != recpkt) {
445 dbg("%s - ptr mismatch %p - %p",
446 __FUNCTION__, &(usbdata[4]), recpkt);
455 if ((0xff & (cksum + *recpkt)) != 0) {
456 dbg("%s - invalid checksum, expected %02x, got %02x",
457 __FUNCTION__, 0xff & -cksum, 0xff & *recpkt);
461 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
462 usbdata[1] = __cpu_to_le32(pktid);
463 usbdata[2] = __cpu_to_le32(size);
465 garmin_write_bulk (garmin_data_p->port, garmin_data_p->inbuffer,
466 GARMIN_PKTHDR_LENGTH+size);
468 /* if this was an abort-transfer command, flush all
470 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
471 garmin_data_p->flags |= FLAGS_DROP_DATA;
472 pkt_clear(garmin_data_p);
481 * Called for data received from tty
483 * buf contains the data read, it may span more than one packet or even
486 * input record should be a serial-record, but it may not be complete.
487 * Copy it into our local buffer, until an etx is seen (or an error
489 * Once the record is complete, convert into a usb packet and send it
490 * to the bulk pipe, send an ack back to the tty.
492 * If the input is an ack, just send the last queued packet to the
495 * if the input is an abort command, drop all queued data.
498 static int gsp_receive(struct garmin_data * garmin_data_p,
499 const unsigned char *buf, int count)
503 int ack_or_nak_seen = 0;
507 // dleSeen: set if last byte read was a DLE
509 // skip: if set, skip incoming data until possible start of
514 spin_lock_irqsave(&garmin_data_p->lock, flags);
515 dest = garmin_data_p->inbuffer;
516 size = garmin_data_p->insize;
517 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
518 skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
519 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
521 dbg("%s - dle=%d skip=%d size=%d count=%d",
522 __FUNCTION__, dleSeen, skip, size, count);
525 size = GSP_INITIAL_OFFSET;
528 while (offs < count) {
534 if (skip) { /* start of a new pkt */
536 size = GSP_INITIAL_OFFSET;
538 } else if (dleSeen) {
544 } else if (data == ETX) {
546 /* packet complete */
548 data = dest[GSP_INITIAL_OFFSET];
551 ack_or_nak_seen = ACK;
552 dbg("ACK packet complete.");
553 } else if (data == NAK) {
554 ack_or_nak_seen = NAK;
555 dbg("NAK packet complete.");
557 dbg("packet complete "
560 gsp_rec_packet(garmin_data_p, size);
564 size = GSP_INITIAL_OFFSET;
572 dbg("non-masked DLE at %d - restarting", i);
573 size = GSP_INITIAL_OFFSET;
580 if (size >= GPS_IN_BUFSIZ) {
581 dbg("%s - packet too large.", __FUNCTION__);
583 size = GSP_INITIAL_OFFSET;
588 spin_lock_irqsave(&garmin_data_p->lock, flags);
590 garmin_data_p->insize = size;
592 // copy flags back to structure
594 garmin_data_p->flags |= FLAGS_GSP_SKIP;
596 garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
599 garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
601 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
603 if (ack_or_nak_seen) {
604 garmin_data_p->state = STATE_GSP_WAIT_DATA;
607 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
609 if (ack_or_nak_seen) {
610 gsp_next_packet(garmin_data_p);
620 * Sends a usb packet to the tty
622 * Assumes, that all packages and at an usb-packet boundary.
624 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
626 static int gsp_send(struct garmin_data * garmin_data_p,
627 const unsigned char *buf, int count)
629 const unsigned char *src;
637 dbg("%s - state %d - %d bytes.", __FUNCTION__,
638 garmin_data_p->state, count);
640 k = garmin_data_p->outsize;
641 if ((k+count) > GPS_OUT_BUFSIZ) {
642 dbg("packet too large");
643 garmin_data_p->outsize = 0;
647 memcpy(garmin_data_p->outbuffer+k, buf, count);
649 garmin_data_p->outsize = k;
651 if (k >= GARMIN_PKTHDR_LENGTH) {
652 pktid = getPacketId(garmin_data_p->outbuffer);
653 datalen= getDataLength(garmin_data_p->outbuffer);
654 i = GARMIN_PKTHDR_LENGTH + datalen;
661 dbg("%s - %d bytes in buffer, %d bytes in pkt.", __FUNCTION__,
664 /* garmin_data_p->outbuffer now contains a complete packet */
666 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
667 __FUNCTION__, k, garmin_data_p->outbuffer);
669 garmin_data_p->outsize = 0;
671 if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
672 dbg("not an application packet (%d)",
673 getLayerId(garmin_data_p->outbuffer));
678 dbg("packet-id %d too large", pktid);
683 dbg("packet-size %d too large", datalen);
687 /* the serial protocol should be able to handle this packet */
690 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
691 for (i=0; i<datalen; i++) {
696 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
697 if (k > (GARMIN_PKTHDR_LENGTH-2)) {
698 /* can't add stuffing DLEs in place, move data to end
700 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
701 memcpy(dst, src, datalen);
705 dst = garmin_data_p->outbuffer;
715 for (i=0; i<datalen; i++) {
723 cksum = 0xFF & -cksum;
730 i = dst-garmin_data_p->outbuffer;
732 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
734 garmin_data_p->pkt_id = pktid;
735 garmin_data_p->state = STATE_WAIT_TTY_ACK;
745 * Process the next pending data packet - if there is one
747 static void gsp_next_packet(struct garmin_data * garmin_data_p)
749 struct garmin_packet *pkt = NULL;
751 while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
752 dbg("%s - next pkt: %d", __FUNCTION__, pkt->seq);
753 if (gsp_send(garmin_data_p, pkt->data, pkt->size) > 0) {
764 /******************************************************************************
766 ******************************************************************************/
770 * Called for data received from tty
772 * The input data is expected to be in garmin usb-packet format.
774 * buf contains the data read, it may span more than one packet
775 * or even incomplete packets
777 static int nat_receive(struct garmin_data * garmin_data_p,
778 const unsigned char *buf, int count)
786 while (offs < count) {
787 // if buffer contains header, copy rest of data
788 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
789 len = GARMIN_PKTHDR_LENGTH
790 +getDataLength(garmin_data_p->inbuffer);
792 len = GARMIN_PKTHDR_LENGTH;
794 if (len >= GPS_IN_BUFSIZ) {
795 /* seem to be an invalid packet, ignore rest of input */
796 dbg("%s - packet size too large: %d",
798 garmin_data_p->insize = 0;
802 len -= garmin_data_p->insize;
803 if (len > (count-offs))
806 dest = garmin_data_p->inbuffer
807 +garmin_data_p->insize;
808 memcpy(dest, buf+offs, len);
809 garmin_data_p->insize += len;
814 /* do we have a complete packet ? */
815 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
816 len = GARMIN_PKTHDR_LENGTH+
817 getDataLength(garmin_data_p->inbuffer);
818 if (garmin_data_p->insize >= len) {
819 garmin_write_bulk (garmin_data_p->port,
820 garmin_data_p->inbuffer,
822 garmin_data_p->insize = 0;
824 /* if this was an abort-transfer command,
825 flush all queued data. */
826 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
827 spin_lock_irqsave(&garmin_data_p->lock, flags);
828 garmin_data_p->flags |= FLAGS_DROP_DATA;
829 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
830 pkt_clear(garmin_data_p);
839 /******************************************************************************
841 ******************************************************************************/
843 static void priv_status_resp(struct usb_serial_port *port)
845 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
846 __le32 *pkt = (__le32 *)garmin_data_p->privpkt;
848 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
849 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
850 pkt[2] = __cpu_to_le32(12);
851 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
852 pkt[4] = __cpu_to_le32(garmin_data_p->mode);
853 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
855 send_to_tty(port, (__u8*)pkt, 6*4);
859 /******************************************************************************
860 * Garmin specific driver functions
861 ******************************************************************************/
863 static int process_resetdev_request(struct usb_serial_port *port)
867 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
869 spin_lock_irqsave(&garmin_data_p->lock, flags);
870 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
871 garmin_data_p->state = STATE_RESET;
872 garmin_data_p->serial_num = 0;
873 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
875 usb_kill_urb (port->interrupt_in_urb);
876 dbg("%s - usb_reset_device", __FUNCTION__ );
877 status = usb_reset_device(port->serial->dev);
879 dbg("%s - usb_reset_device failed: %d",
880 __FUNCTION__, status);
887 * clear all cached data
889 static int garmin_clear(struct garmin_data * garmin_data_p)
894 struct usb_serial_port *port = garmin_data_p->port;
896 if (port != NULL && garmin_data_p->flags & FLAGS_APP_RESP_SEEN) {
897 /* send a terminate command */
898 status = garmin_write_bulk(port, GARMIN_STOP_TRANSFER_REQ,
899 sizeof(GARMIN_STOP_TRANSFER_REQ));
902 /* flush all queued data */
903 pkt_clear(garmin_data_p);
905 spin_lock_irqsave(&garmin_data_p->lock, flags);
906 garmin_data_p->insize = 0;
907 garmin_data_p->outsize = 0;
908 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
918 static int garmin_init_session(struct usb_serial_port *port)
921 struct usb_serial *serial = port->serial;
922 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
926 usb_kill_urb (port->interrupt_in_urb);
928 dbg("%s - adding interrupt input", __FUNCTION__);
929 port->interrupt_in_urb->dev = serial->dev;
930 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
932 dev_err(&serial->dev->dev,
933 "%s - failed submitting interrupt urb,"
935 __FUNCTION__, status);
939 dbg("%s - starting session ...", __FUNCTION__);
940 garmin_data_p->state = STATE_ACTIVE;
941 status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ,
942 sizeof(GARMIN_START_SESSION_REQ));
946 spin_lock_irqsave(&garmin_data_p->lock, flags);
947 garmin_data_p->ignorePkts++;
948 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
950 /* not needed, but the win32 driver does it too ... */
951 status = garmin_write_bulk(port,
952 GARMIN_START_SESSION_REQ2,
953 sizeof(GARMIN_START_SESSION_REQ2));
956 spin_lock_irqsave(&garmin_data_p->lock, flags);
957 garmin_data_p->ignorePkts++;
958 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
970 static int garmin_open (struct usb_serial_port *port, struct file *filp)
974 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
976 dbg("%s - port %d", __FUNCTION__, port->number);
979 * Force low_latency on so that our tty_push actually forces the data
980 * through, otherwise it is scheduled, and with high data rates (like
981 * with OHCI) data can get lost.
984 port->tty->low_latency = 1;
986 spin_lock_irqsave(&garmin_data_p->lock, flags);
987 garmin_data_p->mode = initial_mode;
988 garmin_data_p->count = 0;
989 garmin_data_p->flags = 0;
990 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
992 /* shutdown any bulk reads that might be going on */
993 usb_kill_urb (port->write_urb);
994 usb_kill_urb (port->read_urb);
996 if (garmin_data_p->state == STATE_RESET) {
997 status = garmin_init_session(port);
1000 garmin_data_p->state = STATE_ACTIVE;
1006 static void garmin_close (struct usb_serial_port *port, struct file * filp)
1008 struct usb_serial *serial = port->serial;
1009 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1011 dbg("%s - port %d - mode=%d state=%d flags=0x%X", __FUNCTION__,
1012 port->number, garmin_data_p->mode,
1013 garmin_data_p->state, garmin_data_p->flags);
1018 garmin_clear(garmin_data_p);
1020 /* shutdown our urbs */
1021 usb_kill_urb (port->read_urb);
1022 usb_kill_urb (port->write_urb);
1024 if (noResponseFromAppLayer(garmin_data_p) ||
1025 ((garmin_data_p->flags & CLEAR_HALT_REQUIRED) != 0)) {
1026 process_resetdev_request(port);
1027 garmin_data_p->state = STATE_RESET;
1029 garmin_data_p->state = STATE_DISCONNECTED;
1034 static void garmin_write_bulk_callback (struct urb *urb)
1036 unsigned long flags;
1037 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1038 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1039 int status = urb->status;
1041 /* free up the transfer buffer, as usb_free_urb() does not do this */
1042 kfree (urb->transfer_buffer);
1044 dbg("%s - port %d", __FUNCTION__, port->number);
1047 dbg("%s - nonzero write bulk status received: %d",
1048 __FUNCTION__, status);
1049 spin_lock_irqsave(&garmin_data_p->lock, flags);
1050 garmin_data_p->flags |= CLEAR_HALT_REQUIRED;
1051 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1054 usb_serial_port_softint(port);
1058 static int garmin_write_bulk (struct usb_serial_port *port,
1059 const unsigned char *buf, int count)
1061 unsigned long flags;
1062 struct usb_serial *serial = port->serial;
1063 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1065 unsigned char *buffer;
1068 dbg("%s - port %d, state %d", __FUNCTION__, port->number,
1069 garmin_data_p->state);
1071 spin_lock_irqsave(&garmin_data_p->lock, flags);
1072 garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1073 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1075 buffer = kmalloc (count, GFP_ATOMIC);
1077 dev_err(&port->dev, "out of memory\n");
1081 urb = usb_alloc_urb(0, GFP_ATOMIC);
1083 dev_err(&port->dev, "no more free urbs\n");
1088 memcpy (buffer, buf, count);
1090 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
1092 usb_fill_bulk_urb (urb, serial->dev,
1093 usb_sndbulkpipe (serial->dev,
1094 port->bulk_out_endpointAddress),
1096 garmin_write_bulk_callback, port);
1097 urb->transfer_flags |= URB_ZERO_PACKET;
1099 if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
1100 spin_lock_irqsave(&garmin_data_p->lock, flags);
1101 garmin_data_p->flags |= FLAGS_APP_REQ_SEEN;
1102 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1103 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1104 pkt_clear(garmin_data_p);
1105 garmin_data_p->state = STATE_GSP_WAIT_DATA;
1109 /* send it down the pipe */
1110 status = usb_submit_urb(urb, GFP_ATOMIC);
1113 "%s - usb_submit_urb(write bulk) "
1114 "failed with status = %d\n",
1115 __FUNCTION__, status);
1119 if (GARMIN_LAYERID_APPL == getLayerId(buffer)
1120 && (garmin_data_p->mode == MODE_GARMIN_SERIAL)) {
1122 gsp_send_ack(garmin_data_p, buffer[4]);
1126 /* we are done with this urb, so let the host driver
1127 * really free it when it is finished with it */
1135 static int garmin_write (struct usb_serial_port *port,
1136 const unsigned char *buf, int count)
1138 unsigned long flags;
1139 int pktid, pktsiz, len;
1140 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1141 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1143 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buf);
1145 /* check for our private packets */
1146 if (count >= GARMIN_PKTHDR_LENGTH) {
1152 memcpy(garmin_data_p->privpkt, buf, len);
1154 pktsiz = getDataLength(garmin_data_p->privpkt);
1155 pktid = getPacketId(garmin_data_p->privpkt);
1157 if (count == (GARMIN_PKTHDR_LENGTH+pktsiz)
1158 && GARMIN_LAYERID_PRIVATE == getLayerId(garmin_data_p->privpkt)) {
1160 dbg("%s - processing private request %d",
1161 __FUNCTION__, pktid);
1163 // drop all unfinished transfers
1164 garmin_clear(garmin_data_p);
1168 case PRIV_PKTID_SET_DEBUG:
1171 debug = __le32_to_cpu(privpkt[3]);
1172 dbg("%s - debug level set to 0x%X",
1173 __FUNCTION__, debug);
1176 case PRIV_PKTID_SET_MODE:
1179 garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1180 dbg("%s - mode set to %d",
1181 __FUNCTION__, garmin_data_p->mode);
1184 case PRIV_PKTID_INFO_REQ:
1185 priv_status_resp(port);
1188 case PRIV_PKTID_RESET_REQ:
1189 spin_lock_irqsave(&garmin_data_p->lock, flags);
1190 garmin_data_p->flags |= FLAGS_APP_REQ_SEEN;
1191 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1194 case PRIV_PKTID_SET_DEF_MODE:
1197 initial_mode = __le32_to_cpu(privpkt[3]);
1198 dbg("%s - initial_mode set to %d",
1200 garmin_data_p->mode);
1207 garmin_data_p->ignorePkts = 0;
1209 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1210 return gsp_receive(garmin_data_p, buf, count);
1211 } else { /* MODE_NATIVE */
1212 return nat_receive(garmin_data_p, buf, count);
1217 static int garmin_write_room (struct usb_serial_port *port)
1220 * Report back the bytes currently available in the output buffer.
1222 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1223 return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1227 static int garmin_chars_in_buffer (struct usb_serial_port *port)
1230 * Report back the number of bytes currently in our input buffer.
1231 * Will this lock up the driver - the buffer contains an incomplete
1232 * package which will not be written to the device until it
1233 * has been completed ?
1235 //struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1236 //return garmin_data_p->insize;
1241 static void garmin_read_process(struct garmin_data * garmin_data_p,
1242 unsigned char *data, unsigned data_length)
1244 unsigned long flags;
1246 if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1247 /* abort-transfer cmd is actice */
1248 dbg("%s - pkt dropped", __FUNCTION__);
1249 } else if (garmin_data_p->state != STATE_DISCONNECTED &&
1250 garmin_data_p->state != STATE_RESET ) {
1252 /* remember any appl.layer packets, so we know
1253 if a reset is required or not when closing
1255 if (0 == memcmp(data, GARMIN_APP_LAYER_REPLY,
1256 sizeof(GARMIN_APP_LAYER_REPLY))) {
1257 spin_lock_irqsave(&garmin_data_p->lock, flags);
1258 garmin_data_p->flags |= FLAGS_APP_RESP_SEEN;
1259 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1262 /* if throttling is active or postprecessing is required
1263 put the received data in the input queue, otherwise
1264 send it directly to the tty port */
1265 if (garmin_data_p->flags & FLAGS_QUEUING) {
1266 pkt_add(garmin_data_p, data, data_length);
1267 } else if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1268 if (getLayerId(data) == GARMIN_LAYERID_APPL) {
1269 pkt_add(garmin_data_p, data, data_length);
1272 send_to_tty(garmin_data_p->port, data, data_length);
1278 static void garmin_read_bulk_callback (struct urb *urb)
1280 unsigned long flags;
1281 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1282 struct usb_serial *serial = port->serial;
1283 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1284 unsigned char *data = urb->transfer_buffer;
1285 int status = urb->status;
1288 dbg("%s - port %d", __FUNCTION__, port->number);
1291 dbg("%s - bad serial pointer, exiting", __FUNCTION__);
1296 dbg("%s - nonzero read bulk status received: %d",
1297 __FUNCTION__, status);
1301 usb_serial_debug_data(debug, &port->dev,
1302 __FUNCTION__, urb->actual_length, data);
1304 garmin_read_process(garmin_data_p, data, urb->actual_length);
1306 if (urb->actual_length == 0 &&
1307 0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
1308 spin_lock_irqsave(&garmin_data_p->lock, flags);
1309 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1310 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1311 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1314 "%s - failed resubmitting read urb, error %d\n",
1315 __FUNCTION__, retval);
1316 } else if (urb->actual_length > 0) {
1317 /* Continue trying to read until nothing more is received */
1318 if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
1319 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1322 "%s - failed resubmitting read urb, "
1323 "error %d\n", __FUNCTION__, retval);
1326 dbg("%s - end of bulk data", __FUNCTION__);
1327 spin_lock_irqsave(&garmin_data_p->lock, flags);
1328 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1329 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1335 static void garmin_read_int_callback (struct urb *urb)
1337 unsigned long flags;
1339 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1340 struct usb_serial *serial = port->serial;
1341 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1342 unsigned char *data = urb->transfer_buffer;
1343 int status = urb->status;
1352 /* this urb is terminated, clean up */
1353 dbg("%s - urb shutting down with status: %d",
1354 __FUNCTION__, status);
1357 dbg("%s - nonzero urb status received: %d",
1358 __FUNCTION__, status);
1362 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
1363 urb->actual_length, urb->transfer_buffer);
1365 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1366 0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1367 sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
1369 dbg("%s - bulk data available.", __FUNCTION__);
1371 if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1373 /* bulk data available */
1374 usb_fill_bulk_urb (port->read_urb, serial->dev,
1375 usb_rcvbulkpipe (serial->dev,
1376 port->bulk_in_endpointAddress),
1377 port->read_urb->transfer_buffer,
1378 port->read_urb->transfer_buffer_length,
1379 garmin_read_bulk_callback, port);
1380 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1383 "%s - failed submitting read urb, error %d\n",
1384 __FUNCTION__, retval);
1386 spin_lock_irqsave(&garmin_data_p->lock, flags);
1387 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1388 /* do not send this packet to the user */
1389 garmin_data_p->ignorePkts = 1;
1390 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1393 /* bulk-in transfer still active */
1394 spin_lock_irqsave(&garmin_data_p->lock, flags);
1395 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1396 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1399 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1400 && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
1401 sizeof(GARMIN_START_SESSION_REPLY))) {
1403 spin_lock_irqsave(&garmin_data_p->lock, flags);
1404 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1405 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1407 /* save the serial number */
1408 garmin_data_p->serial_num
1409 = __le32_to_cpup((__le32*)(data+GARMIN_PKTHDR_LENGTH));
1411 dbg("%s - start-of-session reply seen - serial %u.",
1412 __FUNCTION__, garmin_data_p->serial_num);
1415 if (garmin_data_p->ignorePkts) {
1416 /* this reply belongs to a request generated by the driver,
1418 dbg("%s - pkt ignored (%d)",
1419 __FUNCTION__, garmin_data_p->ignorePkts);
1420 spin_lock_irqsave(&garmin_data_p->lock, flags);
1421 garmin_data_p->ignorePkts--;
1422 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1424 garmin_read_process(garmin_data_p, data, urb->actual_length);
1427 port->interrupt_in_urb->dev = port->serial->dev;
1428 retval = usb_submit_urb (urb, GFP_ATOMIC);
1430 dev_err(&urb->dev->dev,
1431 "%s - Error %d submitting interrupt urb\n",
1432 __FUNCTION__, retval);
1437 * Sends the next queued packt to the tty port (garmin native mode only)
1438 * and then sets a timer to call itself again until all queued data
1441 static int garmin_flush_queue(struct garmin_data * garmin_data_p)
1443 unsigned long flags;
1444 struct garmin_packet *pkt;
1446 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1447 pkt = pkt_pop(garmin_data_p);
1449 send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1451 mod_timer(&garmin_data_p->timer, (1)+jiffies);
1454 spin_lock_irqsave(&garmin_data_p->lock, flags);
1455 garmin_data_p->flags &= ~FLAGS_QUEUING;
1456 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1463 static void garmin_throttle (struct usb_serial_port *port)
1465 unsigned long flags;
1466 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1468 dbg("%s - port %d", __FUNCTION__, port->number);
1469 /* set flag, data received will be put into a queue
1470 for later processing */
1471 spin_lock_irqsave(&garmin_data_p->lock, flags);
1472 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1473 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1477 static void garmin_unthrottle (struct usb_serial_port *port)
1479 unsigned long flags;
1480 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1483 dbg("%s - port %d", __FUNCTION__, port->number);
1484 spin_lock_irqsave(&garmin_data_p->lock, flags);
1485 garmin_data_p->flags &= ~FLAGS_THROTTLED;
1486 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1488 /* in native mode send queued data to tty, in
1489 serial mode nothing needs to be done here */
1490 if (garmin_data_p->mode == MODE_NATIVE)
1491 garmin_flush_queue(garmin_data_p);
1493 if (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1494 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1497 "%s - failed resubmitting read urb, error %d\n",
1498 __FUNCTION__, status);
1505 * The timer is currently only used to send queued packets to
1506 * the tty in cases where the protocol provides no own handshaking
1507 * to initiate the transfer.
1509 static void timeout_handler(unsigned long data)
1511 struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1513 /* send the next queued packet to the tty port */
1514 if (garmin_data_p->mode == MODE_NATIVE)
1515 if (garmin_data_p->flags & FLAGS_QUEUING)
1516 garmin_flush_queue(garmin_data_p);
1521 static int garmin_attach (struct usb_serial *serial)
1524 struct usb_serial_port *port = serial->port[0];
1525 struct garmin_data * garmin_data_p = NULL;
1527 dbg("%s", __FUNCTION__);
1529 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1530 if (garmin_data_p == NULL) {
1531 dev_err(&port->dev, "%s - Out of memory\n", __FUNCTION__);
1534 init_timer(&garmin_data_p->timer);
1535 spin_lock_init(&garmin_data_p->lock);
1536 INIT_LIST_HEAD(&garmin_data_p->pktlist);
1537 //garmin_data_p->timer.expires = jiffies + session_timeout;
1538 garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1539 garmin_data_p->timer.function = timeout_handler;
1540 garmin_data_p->port = port;
1541 garmin_data_p->state = 0;
1542 garmin_data_p->count = 0;
1543 usb_set_serial_port_data(port, garmin_data_p);
1545 status = garmin_init_session(port);
1551 static void garmin_shutdown (struct usb_serial *serial)
1553 struct usb_serial_port *port = serial->port[0];
1554 struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
1556 dbg("%s", __FUNCTION__);
1558 usb_kill_urb (port->interrupt_in_urb);
1559 del_timer_sync(&garmin_data_p->timer);
1560 kfree (garmin_data_p);
1561 usb_set_serial_port_data(port, NULL);
1565 /* All of the device info needed */
1566 static struct usb_serial_driver garmin_device = {
1568 .owner = THIS_MODULE,
1569 .name = "garmin_gps",
1571 .description = "Garmin GPS usb/tty",
1572 .usb_driver = &garmin_driver,
1573 .id_table = id_table,
1574 .num_interrupt_in = 1,
1578 .open = garmin_open,
1579 .close = garmin_close,
1580 .throttle = garmin_throttle,
1581 .unthrottle = garmin_unthrottle,
1582 .attach = garmin_attach,
1583 .shutdown = garmin_shutdown,
1584 .write = garmin_write,
1585 .write_room = garmin_write_room,
1586 .chars_in_buffer = garmin_chars_in_buffer,
1587 .write_bulk_callback = garmin_write_bulk_callback,
1588 .read_bulk_callback = garmin_read_bulk_callback,
1589 .read_int_callback = garmin_read_int_callback,
1594 static int __init garmin_init (void)
1598 retval = usb_serial_register(&garmin_device);
1600 goto failed_garmin_register;
1601 retval = usb_register(&garmin_driver);
1603 goto failed_usb_register;
1604 info(DRIVER_DESC " " DRIVER_VERSION);
1607 failed_usb_register:
1608 usb_serial_deregister(&garmin_device);
1609 failed_garmin_register:
1614 static void __exit garmin_exit (void)
1616 usb_deregister (&garmin_driver);
1617 usb_serial_deregister (&garmin_device);
1623 module_init(garmin_init);
1624 module_exit(garmin_exit);
1626 MODULE_AUTHOR( DRIVER_AUTHOR );
1627 MODULE_DESCRIPTION( DRIVER_DESC );
1628 MODULE_LICENSE("GPL");
1630 module_param(debug, bool, S_IWUSR | S_IRUGO);
1631 MODULE_PARM_DESC(debug, "Debug enabled or not");
1632 module_param(initial_mode, int, S_IRUGO);
1633 MODULE_PARM_DESC(initial_mode, "Initial mode");