4 * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de
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 <linux/uaccess.h>
37 #include <linux/atomic.h>
38 #include <linux/usb.h>
39 #include <linux/usb/serial.h>
41 /* the mode to be set when the port ist opened */
42 static int initial_mode = 1;
47 #define GARMIN_VENDOR_ID 0x091E
53 #define VERSION_MAJOR 0
54 #define VERSION_MINOR 36
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"
62 /* error codes returned by the driver */
63 #define EINVPKT 1000 /* invalid packet structure */
66 /* size of the header of a packet using the usb protocol */
67 #define GARMIN_PKTHDR_LENGTH 12
69 /* max. possible size of a packet using the serial protocol */
70 #define MAX_SERIAL_PKT_SIZ (3 + 255 + 3)
72 /* max. possible size of a packet with worst case stuffing */
73 #define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256)
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)
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)
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
89 #define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
91 /* max. size of incoming private packets (header+1 param) */
92 #define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
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
99 #define GARMIN_PKTID_PVT_DATA 51
100 #define GARMIN_PKTID_L001_COMMAND_DATA 10
102 #define CMND_ABORT_TRANSFER 0
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
118 /* structure used to queue incoming packets */
119 struct garmin_packet {
120 struct list_head list;
122 /* the real size of the data array, always > 0 */
127 /* structure used to keep the current state of the driver */
135 struct timer_list timer;
136 struct usb_serial_port *port;
140 __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
141 __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
144 struct list_head pktlist;
145 struct usb_anchor write_urbs;
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 APP_REQ_SEEN 0x0004
172 #define APP_RESP_SEEN 0x0002
173 #define CLEAR_HALT_REQUIRED 0x0001
175 #define FLAGS_QUEUING 0x0100
176 #define FLAGS_DROP_DATA 0x0800
178 #define FLAGS_GSP_SKIP 0x1000
179 #define FLAGS_GSP_DLESEEN 0x2000
186 /* function prototypes */
187 static int 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,
192 /* some special packets to be send or received */
193 static unsigned char const GARMIN_START_SESSION_REQ[]
194 = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 };
195 static unsigned char const GARMIN_START_SESSION_REPLY[]
196 = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
197 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
198 = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
199 static unsigned char const GARMIN_APP_LAYER_REPLY[]
201 static unsigned char const GARMIN_START_PVT_REQ[]
202 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
203 static unsigned char const GARMIN_STOP_PVT_REQ[]
204 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
205 static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
206 = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
207 static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
208 = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
209 static unsigned char const PRIVATE_REQ[]
210 = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
214 static const struct usb_device_id id_table[] = {
215 /* the same device id seems to be used by all
216 usb enabled GPS devices */
217 { USB_DEVICE(GARMIN_VENDOR_ID, 3) },
218 { } /* Terminating entry */
221 MODULE_DEVICE_TABLE(usb, id_table);
223 static struct usb_driver garmin_driver = {
224 .name = "garmin_gps",
225 .probe = usb_serial_probe,
226 .disconnect = usb_serial_disconnect,
227 .id_table = id_table,
232 static inline int getLayerId(const __u8 *usbPacket)
234 return __le32_to_cpup((__le32 *)(usbPacket));
237 static inline int getPacketId(const __u8 *usbPacket)
239 return __le32_to_cpup((__le32 *)(usbPacket+4));
242 static inline int getDataLength(const __u8 *usbPacket)
244 return __le32_to_cpup((__le32 *)(usbPacket+8));
249 * check if the usb-packet in buf contains an abort-transfer command.
250 * (if yes, all queued data will be dropped)
252 static inline int isAbortTrfCmnd(const unsigned char *buf)
254 if (0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
255 sizeof(GARMIN_STOP_TRANSFER_REQ)) ||
256 0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
257 sizeof(GARMIN_STOP_TRANSFER_REQ_V2)))
265 static void send_to_tty(struct usb_serial_port *port,
266 char *data, unsigned int actual_length)
268 struct tty_struct *tty = tty_port_tty_get(&port->port);
270 if (tty && actual_length) {
272 usb_serial_debug_data(debug, &port->dev,
273 __func__, actual_length, data);
275 tty_insert_flip_string(tty, data, actual_length);
276 tty_flip_buffer_push(tty);
282 /******************************************************************************
283 * packet queue handling
284 ******************************************************************************/
287 * queue a received (usb-)packet for later processing
289 static int pkt_add(struct garmin_data *garmin_data_p,
290 unsigned char *data, unsigned int data_length)
295 struct garmin_packet *pkt;
297 /* process only packets containg data ... */
299 pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
302 dev_err(&garmin_data_p->port->dev, "out of memory\n");
305 pkt->size = data_length;
306 memcpy(pkt->data, data, data_length);
308 spin_lock_irqsave(&garmin_data_p->lock, flags);
309 garmin_data_p->flags |= FLAGS_QUEUING;
310 result = list_empty(&garmin_data_p->pktlist);
311 pkt->seq = garmin_data_p->seq_counter++;
312 list_add_tail(&pkt->list, &garmin_data_p->pktlist);
313 state = garmin_data_p->state;
314 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
316 dbg("%s - added: pkt: %d - %d bytes",
317 __func__, pkt->seq, data_length);
319 /* in serial mode, if someone is waiting for data from
320 the device, convert and send the next packet to tty. */
321 if (result && (state == STATE_GSP_WAIT_DATA))
322 gsp_next_packet(garmin_data_p);
328 /* get the next pending packet */
329 static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p)
332 struct garmin_packet *result = NULL;
334 spin_lock_irqsave(&garmin_data_p->lock, flags);
335 if (!list_empty(&garmin_data_p->pktlist)) {
336 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
337 list_del(&result->list);
339 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
344 /* free up all queued data */
345 static void pkt_clear(struct garmin_data *garmin_data_p)
348 struct garmin_packet *result = NULL;
352 spin_lock_irqsave(&garmin_data_p->lock, flags);
353 while (!list_empty(&garmin_data_p->pktlist)) {
354 result = (struct garmin_packet *)garmin_data_p->pktlist.next;
355 list_del(&result->list);
358 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
362 /******************************************************************************
363 * garmin serial protocol handling handling
364 ******************************************************************************/
366 /* send an ack packet back to the tty */
367 static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
374 dbg("%s - pkt-id: 0x%X.", __func__, 0xFF & pkt_id);
390 *ptr++ = 0xFF & (-cksum);
396 send_to_tty(garmin_data_p->port, pkt, l);
403 * called for a complete packet received from tty layer
405 * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
406 * at GSP_INITIAL_OFFSET.
408 * count - number of bytes in the input buffer including space reserved for
409 * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
410 * (including pkt-id, data-length a. cksum)
412 static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
415 const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
416 __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
420 int pktid = recpkt[0];
421 int size = recpkt[1];
423 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
424 __func__, count-GSP_INITIAL_OFFSET, recpkt);
426 if (size != (count-GSP_INITIAL_OFFSET-3)) {
427 dbg("%s - invalid size, expected %d bytes, got %d",
428 __func__, size, (count-GSP_INITIAL_OFFSET-3));
435 /* sanity check, remove after test ... */
436 if ((__u8 *)&(usbdata[3]) != recpkt) {
437 dbg("%s - ptr mismatch %p - %p",
438 __func__, &(usbdata[4]), recpkt);
447 if ((0xff & (cksum + *recpkt)) != 0) {
448 dbg("%s - invalid checksum, expected %02x, got %02x",
449 __func__, 0xff & -cksum, 0xff & *recpkt);
453 usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
454 usbdata[1] = __cpu_to_le32(pktid);
455 usbdata[2] = __cpu_to_le32(size);
457 garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
458 GARMIN_PKTHDR_LENGTH+size, 0);
460 /* if this was an abort-transfer command, flush all
462 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
463 spin_lock_irqsave(&garmin_data_p->lock, flags);
464 garmin_data_p->flags |= FLAGS_DROP_DATA;
465 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
466 pkt_clear(garmin_data_p);
475 * Called for data received from tty
477 * buf contains the data read, it may span more than one packet or even
480 * input record should be a serial-record, but it may not be complete.
481 * Copy it into our local buffer, until an etx is seen (or an error
483 * Once the record is complete, convert into a usb packet and send it
484 * to the bulk pipe, send an ack back to the tty.
486 * If the input is an ack, just send the last queued packet to the
489 * if the input is an abort command, drop all queued data.
492 static int gsp_receive(struct garmin_data *garmin_data_p,
493 const unsigned char *buf, int count)
497 int ack_or_nak_seen = 0;
500 /* dleSeen: set if last byte read was a DLE */
502 /* skip: if set, skip incoming data until possible start of
508 spin_lock_irqsave(&garmin_data_p->lock, flags);
509 dest = garmin_data_p->inbuffer;
510 size = garmin_data_p->insize;
511 dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
512 skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
513 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
515 /* dbg("%s - dle=%d skip=%d size=%d count=%d",
516 __func__, dleSeen, skip, size, count); */
519 size = GSP_INITIAL_OFFSET;
521 while (offs < count) {
527 if (skip) { /* start of a new pkt */
529 size = GSP_INITIAL_OFFSET;
531 } else if (dleSeen) {
537 } else if (data == ETX) {
539 /* packet complete */
541 data = dest[GSP_INITIAL_OFFSET];
544 ack_or_nak_seen = ACK;
545 dbg("ACK packet complete.");
546 } else if (data == NAK) {
547 ack_or_nak_seen = NAK;
548 dbg("NAK packet complete.");
550 dbg("packet complete - id=0x%X.",
552 gsp_rec_packet(garmin_data_p, size);
556 size = GSP_INITIAL_OFFSET;
564 size = GSP_INITIAL_OFFSET;
571 if (size >= GPS_IN_BUFSIZ) {
572 dbg("%s - packet too large.", __func__);
574 size = GSP_INITIAL_OFFSET;
579 spin_lock_irqsave(&garmin_data_p->lock, flags);
581 garmin_data_p->insize = size;
583 /* copy flags back to structure */
585 garmin_data_p->flags |= FLAGS_GSP_SKIP;
587 garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
590 garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
592 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
594 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
596 if (ack_or_nak_seen) {
597 if (gsp_next_packet(garmin_data_p) > 0)
598 garmin_data_p->state = STATE_ACTIVE;
600 garmin_data_p->state = STATE_GSP_WAIT_DATA;
608 * Sends a usb packet to the tty
610 * Assumes, that all packages and at an usb-packet boundary.
612 * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
614 static int gsp_send(struct garmin_data *garmin_data_p,
615 const unsigned char *buf, int count)
617 const unsigned char *src;
625 dbg("%s - state %d - %d bytes.", __func__,
626 garmin_data_p->state, count);
628 k = garmin_data_p->outsize;
629 if ((k+count) > GPS_OUT_BUFSIZ) {
630 dbg("packet too large");
631 garmin_data_p->outsize = 0;
635 memcpy(garmin_data_p->outbuffer+k, buf, count);
637 garmin_data_p->outsize = k;
639 if (k >= GARMIN_PKTHDR_LENGTH) {
640 pktid = getPacketId(garmin_data_p->outbuffer);
641 datalen = getDataLength(garmin_data_p->outbuffer);
642 i = GARMIN_PKTHDR_LENGTH + datalen;
649 dbg("%s - %d bytes in buffer, %d bytes in pkt.", __func__, k, i);
651 /* garmin_data_p->outbuffer now contains a complete packet */
653 usb_serial_debug_data(debug, &garmin_data_p->port->dev,
654 __func__, k, garmin_data_p->outbuffer);
656 garmin_data_p->outsize = 0;
658 if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
659 dbg("not an application packet (%d)",
660 getLayerId(garmin_data_p->outbuffer));
665 dbg("packet-id %d too large", pktid);
670 dbg("packet-size %d too large", datalen);
674 /* the serial protocol should be able to handle this packet */
677 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
678 for (i = 0; i < datalen; i++) {
683 src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
684 if (k > (GARMIN_PKTHDR_LENGTH-2)) {
685 /* can't add stuffing DLEs in place, move data to end
687 dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
688 memcpy(dst, src, datalen);
692 dst = garmin_data_p->outbuffer;
702 for (i = 0; i < datalen; i++) {
710 cksum = 0xFF & -cksum;
717 i = dst-garmin_data_p->outbuffer;
719 send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
721 garmin_data_p->pkt_id = pktid;
722 garmin_data_p->state = STATE_WAIT_TTY_ACK;
729 * Process the next pending data packet - if there is one
731 static int gsp_next_packet(struct garmin_data *garmin_data_p)
734 struct garmin_packet *pkt = NULL;
736 while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
737 dbg("%s - next pkt: %d", __func__, pkt->seq);
738 result = gsp_send(garmin_data_p, pkt->data, pkt->size);
750 /******************************************************************************
752 ******************************************************************************/
756 * Called for data received from tty
758 * The input data is expected to be in garmin usb-packet format.
760 * buf contains the data read, it may span more than one packet
761 * or even incomplete packets
763 static int nat_receive(struct garmin_data *garmin_data_p,
764 const unsigned char *buf, int count)
772 while (offs < count) {
773 /* if buffer contains header, copy rest of data */
774 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
775 len = GARMIN_PKTHDR_LENGTH
776 +getDataLength(garmin_data_p->inbuffer);
778 len = GARMIN_PKTHDR_LENGTH;
780 if (len >= GPS_IN_BUFSIZ) {
781 /* seems to be an invalid packet, ignore rest
783 dbg("%s - packet size too large: %d", __func__, len);
784 garmin_data_p->insize = 0;
788 len -= garmin_data_p->insize;
789 if (len > (count-offs))
792 dest = garmin_data_p->inbuffer
793 + garmin_data_p->insize;
794 memcpy(dest, buf+offs, len);
795 garmin_data_p->insize += len;
800 /* do we have a complete packet ? */
801 if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
802 len = GARMIN_PKTHDR_LENGTH+
803 getDataLength(garmin_data_p->inbuffer);
804 if (garmin_data_p->insize >= len) {
805 garmin_write_bulk(garmin_data_p->port,
806 garmin_data_p->inbuffer,
808 garmin_data_p->insize = 0;
810 /* if this was an abort-transfer command,
811 flush all queued data. */
812 if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
813 spin_lock_irqsave(&garmin_data_p->lock,
815 garmin_data_p->flags |= FLAGS_DROP_DATA;
816 spin_unlock_irqrestore(
817 &garmin_data_p->lock, flags);
818 pkt_clear(garmin_data_p);
827 /******************************************************************************
829 ******************************************************************************/
831 static void priv_status_resp(struct usb_serial_port *port)
833 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
834 __le32 *pkt = (__le32 *)garmin_data_p->privpkt;
836 pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
837 pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
838 pkt[2] = __cpu_to_le32(12);
839 pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
840 pkt[4] = __cpu_to_le32(garmin_data_p->mode);
841 pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
843 send_to_tty(port, (__u8 *)pkt, 6 * 4);
847 /******************************************************************************
848 * Garmin specific driver functions
849 ******************************************************************************/
851 static int process_resetdev_request(struct usb_serial_port *port)
855 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
857 spin_lock_irqsave(&garmin_data_p->lock, flags);
858 garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
859 garmin_data_p->state = STATE_RESET;
860 garmin_data_p->serial_num = 0;
861 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
863 usb_kill_urb(port->interrupt_in_urb);
864 dbg("%s - usb_reset_device", __func__);
865 status = usb_reset_device(port->serial->dev);
867 dbg("%s - usb_reset_device failed: %d",
875 * clear all cached data
877 static int garmin_clear(struct garmin_data *garmin_data_p)
882 /* flush all queued data */
883 pkt_clear(garmin_data_p);
885 spin_lock_irqsave(&garmin_data_p->lock, flags);
886 garmin_data_p->insize = 0;
887 garmin_data_p->outsize = 0;
888 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
894 static int garmin_init_session(struct usb_serial_port *port)
896 struct usb_serial *serial = port->serial;
897 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
902 usb_kill_urb(port->interrupt_in_urb);
904 dbg("%s - adding interrupt input", __func__);
905 port->interrupt_in_urb->dev = serial->dev;
906 status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
908 dev_err(&serial->dev->dev,
909 "%s - failed submitting interrupt urb, error %d\n",
914 * using the initialization method from gpsbabel. See comments in
915 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
918 dbg("%s - starting session ...", __func__);
919 garmin_data_p->state = STATE_ACTIVE;
921 for (i = 0; i < 3; i++) {
922 status = garmin_write_bulk(port,
923 GARMIN_START_SESSION_REQ,
924 sizeof(GARMIN_START_SESSION_REQ), 0);
937 usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
938 usb_kill_urb(port->interrupt_in_urb);
945 static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
949 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
951 dbg("%s - port %d", __func__, port->number);
953 spin_lock_irqsave(&garmin_data_p->lock, flags);
954 garmin_data_p->mode = initial_mode;
955 garmin_data_p->count = 0;
956 garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
957 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
959 /* shutdown any bulk reads that might be going on */
960 usb_kill_urb(port->read_urb);
962 if (garmin_data_p->state == STATE_RESET)
963 status = garmin_init_session(port);
965 garmin_data_p->state = STATE_ACTIVE;
970 static void garmin_close(struct usb_serial_port *port)
972 struct usb_serial *serial = port->serial;
973 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
975 dbg("%s - port %d - mode=%d state=%d flags=0x%X", __func__,
976 port->number, garmin_data_p->mode,
977 garmin_data_p->state, garmin_data_p->flags);
982 garmin_clear(garmin_data_p);
984 /* shutdown our urbs */
985 usb_kill_urb(port->read_urb);
986 usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
988 /* keep reset state so we know that we must start a new session */
989 if (garmin_data_p->state != STATE_RESET)
990 garmin_data_p->state = STATE_DISCONNECTED;
994 static void garmin_write_bulk_callback(struct urb *urb)
996 struct usb_serial_port *port = urb->context;
999 struct garmin_data *garmin_data_p =
1000 usb_get_serial_port_data(port);
1002 dbg("%s - port %d", __func__, port->number);
1004 if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)) {
1006 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1007 gsp_send_ack(garmin_data_p,
1008 ((__u8 *)urb->transfer_buffer)[4]);
1011 usb_serial_port_softint(port);
1014 /* Ignore errors that resulted from garmin_write_bulk with
1017 /* free up the transfer buffer, as usb_free_urb() does not do this */
1018 kfree(urb->transfer_buffer);
1022 static int garmin_write_bulk(struct usb_serial_port *port,
1023 const unsigned char *buf, int count,
1026 unsigned long flags;
1027 struct usb_serial *serial = port->serial;
1028 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1030 unsigned char *buffer;
1033 dbg("%s - port %d, state %d", __func__, port->number,
1034 garmin_data_p->state);
1036 spin_lock_irqsave(&garmin_data_p->lock, flags);
1037 garmin_data_p->flags &= ~FLAGS_DROP_DATA;
1038 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1040 buffer = kmalloc(count, GFP_ATOMIC);
1042 dev_err(&port->dev, "out of memory\n");
1046 urb = usb_alloc_urb(0, GFP_ATOMIC);
1048 dev_err(&port->dev, "no more free urbs\n");
1053 memcpy(buffer, buf, count);
1055 usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
1057 usb_fill_bulk_urb(urb, serial->dev,
1058 usb_sndbulkpipe(serial->dev,
1059 port->bulk_out_endpointAddress),
1061 garmin_write_bulk_callback,
1062 dismiss_ack ? NULL : port);
1063 urb->transfer_flags |= URB_ZERO_PACKET;
1065 if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
1067 spin_lock_irqsave(&garmin_data_p->lock, flags);
1068 garmin_data_p->flags |= APP_REQ_SEEN;
1069 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1071 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1072 pkt_clear(garmin_data_p);
1073 garmin_data_p->state = STATE_GSP_WAIT_DATA;
1077 /* send it down the pipe */
1078 usb_anchor_urb(urb, &garmin_data_p->write_urbs);
1079 status = usb_submit_urb(urb, GFP_ATOMIC);
1082 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
1085 usb_unanchor_urb(urb);
1089 /* we are done with this urb, so let the host driver
1090 * really free it when it is finished with it */
1096 static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
1097 const unsigned char *buf, int count)
1099 int pktid, pktsiz, len;
1100 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1101 __le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
1103 usb_serial_debug_data(debug, &port->dev, __func__, count, buf);
1105 if (garmin_data_p->state == STATE_RESET)
1108 /* check for our private packets */
1109 if (count >= GARMIN_PKTHDR_LENGTH) {
1114 memcpy(garmin_data_p->privpkt, buf, len);
1116 pktsiz = getDataLength(garmin_data_p->privpkt);
1117 pktid = getPacketId(garmin_data_p->privpkt);
1119 if (count == (GARMIN_PKTHDR_LENGTH+pktsiz)
1120 && GARMIN_LAYERID_PRIVATE ==
1121 getLayerId(garmin_data_p->privpkt)) {
1123 dbg("%s - processing private request %d",
1126 /* drop all unfinished transfers */
1127 garmin_clear(garmin_data_p);
1131 case PRIV_PKTID_SET_DEBUG:
1134 debug = __le32_to_cpu(privpkt[3]);
1135 dbg("%s - debug level set to 0x%X",
1139 case PRIV_PKTID_SET_MODE:
1142 garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
1143 dbg("%s - mode set to %d",
1144 __func__, garmin_data_p->mode);
1147 case PRIV_PKTID_INFO_REQ:
1148 priv_status_resp(port);
1151 case PRIV_PKTID_RESET_REQ:
1152 process_resetdev_request(port);
1155 case PRIV_PKTID_SET_DEF_MODE:
1158 initial_mode = __le32_to_cpu(privpkt[3]);
1159 dbg("%s - initial_mode set to %d",
1161 garmin_data_p->mode);
1168 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1169 return gsp_receive(garmin_data_p, buf, count);
1170 } else { /* MODE_NATIVE */
1171 return nat_receive(garmin_data_p, buf, count);
1176 static int garmin_write_room(struct tty_struct *tty)
1178 struct usb_serial_port *port = tty->driver_data;
1180 * Report back the bytes currently available in the output buffer.
1182 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1183 return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
1187 static void garmin_read_process(struct garmin_data *garmin_data_p,
1188 unsigned char *data, unsigned data_length,
1191 unsigned long flags;
1193 if (garmin_data_p->flags & FLAGS_DROP_DATA) {
1194 /* abort-transfer cmd is actice */
1195 dbg("%s - pkt dropped", __func__);
1196 } else if (garmin_data_p->state != STATE_DISCONNECTED &&
1197 garmin_data_p->state != STATE_RESET) {
1199 /* if throttling is active or postprecessing is required
1200 put the received data in the input queue, otherwise
1201 send it directly to the tty port */
1202 if (garmin_data_p->flags & FLAGS_QUEUING) {
1203 pkt_add(garmin_data_p, data, data_length);
1204 } else if (bulk_data ||
1205 getLayerId(data) == GARMIN_LAYERID_APPL) {
1207 spin_lock_irqsave(&garmin_data_p->lock, flags);
1208 garmin_data_p->flags |= APP_RESP_SEEN;
1209 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1211 if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
1212 pkt_add(garmin_data_p, data, data_length);
1214 send_to_tty(garmin_data_p->port, data,
1218 /* ignore system layer packets ... */
1223 static void garmin_read_bulk_callback(struct urb *urb)
1225 unsigned long flags;
1226 struct usb_serial_port *port = urb->context;
1227 struct usb_serial *serial = port->serial;
1228 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1229 unsigned char *data = urb->transfer_buffer;
1230 int status = urb->status;
1233 dbg("%s - port %d", __func__, port->number);
1236 dbg("%s - bad serial pointer, exiting", __func__);
1241 dbg("%s - nonzero read bulk status received: %d",
1246 usb_serial_debug_data(debug, &port->dev,
1247 __func__, urb->actual_length, data);
1249 garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
1251 if (urb->actual_length == 0 &&
1252 0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
1253 spin_lock_irqsave(&garmin_data_p->lock, flags);
1254 garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
1255 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1256 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1259 "%s - failed resubmitting read urb, error %d\n",
1261 } else if (urb->actual_length > 0) {
1262 /* Continue trying to read until nothing more is received */
1263 if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
1264 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1267 "%s - failed resubmitting read urb, "
1268 "error %d\n", __func__, retval);
1271 dbg("%s - end of bulk data", __func__);
1272 spin_lock_irqsave(&garmin_data_p->lock, flags);
1273 garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
1274 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1279 static void garmin_read_int_callback(struct urb *urb)
1281 unsigned long flags;
1283 struct usb_serial_port *port = urb->context;
1284 struct usb_serial *serial = port->serial;
1285 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1286 unsigned char *data = urb->transfer_buffer;
1287 int status = urb->status;
1296 /* this urb is terminated, clean up */
1297 dbg("%s - urb shutting down with status: %d",
1301 dbg("%s - nonzero urb status received: %d",
1306 usb_serial_debug_data(debug, &port->dev, __func__,
1307 urb->actual_length, urb->transfer_buffer);
1309 if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
1310 0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
1311 sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
1313 dbg("%s - bulk data available.", __func__);
1315 if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1317 /* bulk data available */
1318 usb_fill_bulk_urb(port->read_urb, serial->dev,
1319 usb_rcvbulkpipe(serial->dev,
1320 port->bulk_in_endpointAddress),
1321 port->read_urb->transfer_buffer,
1322 port->read_urb->transfer_buffer_length,
1323 garmin_read_bulk_callback, port);
1324 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1327 "%s - failed submitting read urb, error %d\n",
1330 spin_lock_irqsave(&garmin_data_p->lock, flags);
1331 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
1332 spin_unlock_irqrestore(&garmin_data_p->lock,
1336 /* bulk-in transfer still active */
1337 spin_lock_irqsave(&garmin_data_p->lock, flags);
1338 garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
1339 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1342 } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
1343 && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
1344 sizeof(GARMIN_START_SESSION_REPLY))) {
1346 spin_lock_irqsave(&garmin_data_p->lock, flags);
1347 garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
1348 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1350 /* save the serial number */
1351 garmin_data_p->serial_num = __le32_to_cpup(
1352 (__le32 *)(data+GARMIN_PKTHDR_LENGTH));
1354 dbg("%s - start-of-session reply seen - serial %u.",
1355 __func__, garmin_data_p->serial_num);
1358 garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
1360 port->interrupt_in_urb->dev = port->serial->dev;
1361 retval = usb_submit_urb(urb, GFP_ATOMIC);
1363 dev_err(&urb->dev->dev,
1364 "%s - Error %d submitting interrupt urb\n",
1370 * Sends the next queued packt to the tty port (garmin native mode only)
1371 * and then sets a timer to call itself again until all queued data
1374 static int garmin_flush_queue(struct garmin_data *garmin_data_p)
1376 unsigned long flags;
1377 struct garmin_packet *pkt;
1379 if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
1380 pkt = pkt_pop(garmin_data_p);
1382 send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
1384 mod_timer(&garmin_data_p->timer, (1)+jiffies);
1387 spin_lock_irqsave(&garmin_data_p->lock, flags);
1388 garmin_data_p->flags &= ~FLAGS_QUEUING;
1389 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
1396 static void garmin_throttle(struct tty_struct *tty)
1398 struct usb_serial_port *port = tty->driver_data;
1399 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1401 dbg("%s - port %d", __func__, port->number);
1402 /* set flag, data received will be put into a queue
1403 for later processing */
1404 spin_lock_irq(&garmin_data_p->lock);
1405 garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
1406 spin_unlock_irq(&garmin_data_p->lock);
1410 static void garmin_unthrottle(struct tty_struct *tty)
1412 struct usb_serial_port *port = tty->driver_data;
1413 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1416 dbg("%s - port %d", __func__, port->number);
1417 spin_lock_irq(&garmin_data_p->lock);
1418 garmin_data_p->flags &= ~FLAGS_THROTTLED;
1419 spin_unlock_irq(&garmin_data_p->lock);
1421 /* in native mode send queued data to tty, in
1422 serial mode nothing needs to be done here */
1423 if (garmin_data_p->mode == MODE_NATIVE)
1424 garmin_flush_queue(garmin_data_p);
1426 if (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
1427 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1430 "%s - failed resubmitting read urb, error %d\n",
1436 * The timer is currently only used to send queued packets to
1437 * the tty in cases where the protocol provides no own handshaking
1438 * to initiate the transfer.
1440 static void timeout_handler(unsigned long data)
1442 struct garmin_data *garmin_data_p = (struct garmin_data *) data;
1444 /* send the next queued packet to the tty port */
1445 if (garmin_data_p->mode == MODE_NATIVE)
1446 if (garmin_data_p->flags & FLAGS_QUEUING)
1447 garmin_flush_queue(garmin_data_p);
1452 static int garmin_attach(struct usb_serial *serial)
1455 struct usb_serial_port *port = serial->port[0];
1456 struct garmin_data *garmin_data_p = NULL;
1458 dbg("%s", __func__);
1460 garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
1461 if (garmin_data_p == NULL) {
1462 dev_err(&port->dev, "%s - Out of memory\n", __func__);
1465 init_timer(&garmin_data_p->timer);
1466 spin_lock_init(&garmin_data_p->lock);
1467 INIT_LIST_HEAD(&garmin_data_p->pktlist);
1468 /* garmin_data_p->timer.expires = jiffies + session_timeout; */
1469 garmin_data_p->timer.data = (unsigned long)garmin_data_p;
1470 garmin_data_p->timer.function = timeout_handler;
1471 garmin_data_p->port = port;
1472 garmin_data_p->state = 0;
1473 garmin_data_p->flags = 0;
1474 garmin_data_p->count = 0;
1475 init_usb_anchor(&garmin_data_p->write_urbs);
1476 usb_set_serial_port_data(port, garmin_data_p);
1478 status = garmin_init_session(port);
1484 kfree(garmin_data_p);
1490 static void garmin_disconnect(struct usb_serial *serial)
1492 struct usb_serial_port *port = serial->port[0];
1493 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1495 dbg("%s", __func__);
1497 usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
1498 usb_kill_urb(port->interrupt_in_urb);
1499 del_timer_sync(&garmin_data_p->timer);
1503 static void garmin_release(struct usb_serial *serial)
1505 struct usb_serial_port *port = serial->port[0];
1506 struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
1508 dbg("%s", __func__);
1510 kfree(garmin_data_p);
1514 /* All of the device info needed */
1515 static struct usb_serial_driver garmin_device = {
1517 .owner = THIS_MODULE,
1518 .name = "garmin_gps",
1520 .description = "Garmin GPS usb/tty",
1521 .usb_driver = &garmin_driver,
1522 .id_table = id_table,
1524 .open = garmin_open,
1525 .close = garmin_close,
1526 .throttle = garmin_throttle,
1527 .unthrottle = garmin_unthrottle,
1528 .attach = garmin_attach,
1529 .disconnect = garmin_disconnect,
1530 .release = garmin_release,
1531 .write = garmin_write,
1532 .write_room = garmin_write_room,
1533 .write_bulk_callback = garmin_write_bulk_callback,
1534 .read_bulk_callback = garmin_read_bulk_callback,
1535 .read_int_callback = garmin_read_int_callback,
1540 static int __init garmin_init(void)
1544 retval = usb_serial_register(&garmin_device);
1546 goto failed_garmin_register;
1547 retval = usb_register(&garmin_driver);
1549 goto failed_usb_register;
1550 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1554 failed_usb_register:
1555 usb_serial_deregister(&garmin_device);
1556 failed_garmin_register:
1561 static void __exit garmin_exit(void)
1563 usb_deregister(&garmin_driver);
1564 usb_serial_deregister(&garmin_device);
1570 module_init(garmin_init);
1571 module_exit(garmin_exit);
1573 MODULE_AUTHOR(DRIVER_AUTHOR);
1574 MODULE_DESCRIPTION(DRIVER_DESC);
1575 MODULE_LICENSE("GPL");
1577 module_param(debug, bool, S_IWUSR | S_IRUGO);
1578 MODULE_PARM_DESC(debug, "Debug enabled or not");
1579 module_param(initial_mode, int, S_IRUGO);
1580 MODULE_PARM_DESC(initial_mode, "Initial mode");