Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1449 insertions, 0 deletions

diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
new file mode 100644
index 000000000..c02c19bb1
--- /dev/null
+++ b/drivers/usb/serial/garmin_gps.c
@@ -0,0 +1,1449 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Garmin GPS driver
+ *
+ * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de
+ *
+ * The latest version of the driver can be found at
+ * http://sourceforge.net/projects/garmin-gps/
+ *
+ * This driver has been derived from v2.1 of the visor driver.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+/* the mode to be set when the port ist opened */
+static int initial_mode = 1;
+
+#define GARMIN_VENDOR_ID             0x091E
+
+/*
+ * Version Information
+ */
+
+#define VERSION_MAJOR	0
+#define VERSION_MINOR	36
+
+#define _STR(s) #s
+#define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b)
+#define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
+#define DRIVER_AUTHOR "hermann kneissel"
+#define DRIVER_DESC "garmin gps driver"
+
+/* error codes returned by the driver */
+#define EINVPKT	1000	/* invalid packet structure */
+
+
+/* size of the header of a packet using the usb protocol */
+#define GARMIN_PKTHDR_LENGTH	12
+
+/* max. possible size of a packet using the serial protocol */
+#define MAX_SERIAL_PKT_SIZ (3 + 255 + 3)
+
+/*  max. possible size of a packet with worst case stuffing */
+#define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256)
+
+/* size of a buffer able to hold a complete (no stuffing) packet
+ * (the document protocol does not contain packets with a larger
+ *  size, but in theory a packet may be 64k+12 bytes - if in
+ *  later protocol versions larger packet sizes occur, this value
+ *  should be increased accordingly, so the input buffer is always
+ *  large enough the store a complete packet inclusive header) */
+#define GPS_IN_BUFSIZ  (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
+
+/* size of a buffer able to hold a complete (incl. stuffing) packet */
+#define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
+
+/* where to place the packet id of a serial packet, so we can
+ * prepend the usb-packet header without the need to move the
+ * packets data */
+#define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
+
+/* max. size of incoming private packets (header+1 param) */
+#define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
+
+#define GARMIN_LAYERID_TRANSPORT  0
+#define GARMIN_LAYERID_APPL      20
+/* our own layer-id to use for some control mechanisms */
+#define GARMIN_LAYERID_PRIVATE	0x01106E4B
+
+#define GARMIN_PKTID_PVT_DATA	51
+#define GARMIN_PKTID_L001_COMMAND_DATA 10
+
+#define CMND_ABORT_TRANSFER 0
+
+/* packet ids used in private layer */
+#define PRIV_PKTID_SET_DEBUG	1
+#define PRIV_PKTID_SET_MODE	2
+#define PRIV_PKTID_INFO_REQ	3
+#define PRIV_PKTID_INFO_RESP	4
+#define PRIV_PKTID_RESET_REQ	5
+#define PRIV_PKTID_SET_DEF_MODE	6
+
+
+#define ETX	0x03
+#define DLE	0x10
+#define ACK	0x06
+#define NAK	0x15
+
+/* structure used to queue incoming packets */
+struct garmin_packet {
+	struct list_head  list;
+	int               seq;
+	/* the real size of the data array, always > 0 */
+	int               size;
+	__u8              data[];
+};
+
+/* structure used to keep the current state of the driver */
+struct garmin_data {
+	__u8   state;
+	__u16  flags;
+	__u8   mode;
+	__u8   count;
+	__u8   pkt_id;
+	__u32  serial_num;
+	struct timer_list timer;
+	struct usb_serial_port *port;
+	int    seq_counter;
+	int    insize;
+	int    outsize;
+	__u8   inbuffer [GPS_IN_BUFSIZ];  /* tty -> usb */
+	__u8   outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
+	__u8   privpkt[4*6];
+	spinlock_t lock;
+	struct list_head pktlist;
+	struct usb_anchor write_urbs;
+};
+
+
+#define STATE_NEW            0
+#define STATE_INITIAL_DELAY  1
+#define STATE_TIMEOUT        2
+#define STATE_SESSION_REQ1   3
+#define STATE_SESSION_REQ2   4
+#define STATE_ACTIVE         5
+
+#define STATE_RESET	     8
+#define STATE_DISCONNECTED   9
+#define STATE_WAIT_TTY_ACK  10
+#define STATE_GSP_WAIT_DATA 11
+
+#define MODE_NATIVE          0
+#define MODE_GARMIN_SERIAL   1
+
+/* Flags used in garmin_data.flags: */
+#define FLAGS_SESSION_REPLY_MASK  0x00C0
+#define FLAGS_SESSION_REPLY1_SEEN 0x0080
+#define FLAGS_SESSION_REPLY2_SEEN 0x0040
+#define FLAGS_BULK_IN_ACTIVE      0x0020
+#define FLAGS_BULK_IN_RESTART     0x0010
+#define FLAGS_THROTTLED           0x0008
+#define APP_REQ_SEEN              0x0004
+#define APP_RESP_SEEN             0x0002
+#define CLEAR_HALT_REQUIRED       0x0001
+
+#define FLAGS_QUEUING             0x0100
+#define FLAGS_DROP_DATA           0x0800
+
+#define FLAGS_GSP_SKIP            0x1000
+#define FLAGS_GSP_DLESEEN         0x2000
+
+
+
+
+
+
+/* function prototypes */
+static int gsp_next_packet(struct garmin_data *garmin_data_p);
+static int garmin_write_bulk(struct usb_serial_port *port,
+			     const unsigned char *buf, int count,
+			     int dismiss_ack);
+
+/* some special packets to be send or received */
+static unsigned char const GARMIN_START_SESSION_REQ[]
+	= { 0, 0, 0, 0,  5, 0, 0, 0, 0, 0, 0, 0 };
+static unsigned char const GARMIN_START_SESSION_REPLY[]
+	= { 0, 0, 0, 0,  6, 0, 0, 0, 4, 0, 0, 0 };
+static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
+	= { 0, 0, 0, 0,  2, 0, 0, 0, 0, 0, 0, 0 };
+static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
+	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
+static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
+	= { 20, 0, 0, 0,  10, 0, 0, 0, 1, 0, 0, 0, 0 };
+
+/* packets currently unused, left as documentation */
+#if 0
+static unsigned char const GARMIN_APP_LAYER_REPLY[]
+	= { 0x14, 0, 0, 0 };
+static unsigned char const GARMIN_START_PVT_REQ[]
+	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
+static unsigned char const GARMIN_STOP_PVT_REQ[]
+	= { 20, 0, 0, 0,  10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
+static unsigned char const PRIVATE_REQ[]
+	=    { 0x4B, 0x6E, 0x10, 0x01,  0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
+#endif
+
+
+static const struct usb_device_id id_table[] = {
+	/* the same device id seems to be used by all
+	   usb enabled GPS devices */
+	{ USB_DEVICE(GARMIN_VENDOR_ID, 3) },
+	{ }					/* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+
+static inline int getLayerId(const __u8 *usbPacket)
+{
+	return __le32_to_cpup((__le32 *)(usbPacket));
+}
+
+static inline int getPacketId(const __u8 *usbPacket)
+{
+	return __le32_to_cpup((__le32 *)(usbPacket+4));
+}
+
+static inline int getDataLength(const __u8 *usbPacket)
+{
+	return __le32_to_cpup((__le32 *)(usbPacket+8));
+}
+
+
+/*
+ * check if the usb-packet in buf contains an abort-transfer command.
+ * (if yes, all queued data will be dropped)
+ */
+static inline int isAbortTrfCmnd(const unsigned char *buf)
+{
+	if (memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
+			sizeof(GARMIN_STOP_TRANSFER_REQ)) == 0 ||
+	    memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
+			sizeof(GARMIN_STOP_TRANSFER_REQ_V2)) == 0)
+		return 1;
+	else
+		return 0;
+}
+
+
+
+static void send_to_tty(struct usb_serial_port *port,
+			char *data, unsigned int actual_length)
+{
+	if (actual_length) {
+		usb_serial_debug_data(&port->dev, __func__, actual_length, data);
+		tty_insert_flip_string(&port->port, data, actual_length);
+		tty_flip_buffer_push(&port->port);
+	}
+}
+
+
+/******************************************************************************
+ * packet queue handling
+ ******************************************************************************/
+
+/*
+ * queue a received (usb-)packet for later processing
+ */
+static int pkt_add(struct garmin_data *garmin_data_p,
+		   unsigned char *data, unsigned int data_length)
+{
+	int state = 0;
+	int result = 0;
+	unsigned long flags;
+	struct garmin_packet *pkt;
+
+	/* process only packets containing data ... */
+	if (data_length) {
+		pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
+								GFP_ATOMIC);
+		if (!pkt)
+			return 0;
+
+		pkt->size = data_length;
+		memcpy(pkt->data, data, data_length);
+
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags |= FLAGS_QUEUING;
+		result = list_empty(&garmin_data_p->pktlist);
+		pkt->seq = garmin_data_p->seq_counter++;
+		list_add_tail(&pkt->list, &garmin_data_p->pktlist);
+		state = garmin_data_p->state;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+		dev_dbg(&garmin_data_p->port->dev,
+			"%s - added: pkt: %d - %d bytes\n", __func__,
+			pkt->seq, data_length);
+
+		/* in serial mode, if someone is waiting for data from
+		   the device, convert and send the next packet to tty. */
+		if (result && (state == STATE_GSP_WAIT_DATA))
+			gsp_next_packet(garmin_data_p);
+	}
+	return result;
+}
+
+
+/* get the next pending packet */
+static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p)
+{
+	unsigned long flags;
+	struct garmin_packet *result = NULL;
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	if (!list_empty(&garmin_data_p->pktlist)) {
+		result = (struct garmin_packet *)garmin_data_p->pktlist.next;
+		list_del(&result->list);
+	}
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+	return result;
+}
+
+
+/* free up all queued data */
+static void pkt_clear(struct garmin_data *garmin_data_p)
+{
+	unsigned long flags;
+	struct garmin_packet *result = NULL;
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	while (!list_empty(&garmin_data_p->pktlist)) {
+		result = (struct garmin_packet *)garmin_data_p->pktlist.next;
+		list_del(&result->list);
+		kfree(result);
+	}
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+}
+
+
+/******************************************************************************
+ * garmin serial protocol handling handling
+ ******************************************************************************/
+
+/* send an ack packet back to the tty */
+static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
+{
+	__u8 pkt[10];
+	__u8 cksum = 0;
+	__u8 *ptr = pkt;
+	unsigned  l = 0;
+
+	dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__,
+			pkt_id);
+
+	*ptr++ = DLE;
+	*ptr++ = ACK;
+	cksum += ACK;
+
+	*ptr++ = 2;
+	cksum += 2;
+
+	*ptr++ = pkt_id;
+	cksum += pkt_id;
+
+	if (pkt_id == DLE)
+		*ptr++ = DLE;
+
+	*ptr++ = 0;
+	*ptr++ = (-cksum) & 0xFF;
+	*ptr++ = DLE;
+	*ptr++ = ETX;
+
+	l = ptr-pkt;
+
+	send_to_tty(garmin_data_p->port, pkt, l);
+	return 0;
+}
+
+
+
+/*
+ * called for a complete packet received from tty layer
+ *
+ * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
+ * at GSP_INITIAL_OFFSET.
+ *
+ * count - number of bytes in the input buffer including space reserved for
+ *         the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
+ *         (including pkt-id, data-length a. cksum)
+ */
+static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count)
+{
+	struct device *dev = &garmin_data_p->port->dev;
+	unsigned long flags;
+	const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
+	__le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
+	int cksum = 0;
+	int n = 0;
+	int pktid = recpkt[0];
+	int size = recpkt[1];
+
+	usb_serial_debug_data(&garmin_data_p->port->dev, __func__,
+			      count-GSP_INITIAL_OFFSET, recpkt);
+
+	if (size != (count-GSP_INITIAL_OFFSET-3)) {
+		dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n",
+			__func__, size, (count-GSP_INITIAL_OFFSET-3));
+		return -EINVPKT;
+	}
+
+	cksum += *recpkt++;
+	cksum += *recpkt++;
+
+	/* sanity check, remove after test ... */
+	if ((__u8 *)&(usbdata[3]) != recpkt) {
+		dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__,
+			&(usbdata[4]), recpkt);
+		return -EINVPKT;
+	}
+
+	while (n < size) {
+		cksum += *recpkt++;
+		n++;
+	}
+
+	if (((cksum + *recpkt) & 0xff) != 0) {
+		dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n",
+			__func__, -cksum & 0xff, *recpkt);
+		return -EINVPKT;
+	}
+
+	usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
+	usbdata[1] = __cpu_to_le32(pktid);
+	usbdata[2] = __cpu_to_le32(size);
+
+	garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer,
+			   GARMIN_PKTHDR_LENGTH+size, 0);
+
+	/* if this was an abort-transfer command, flush all
+	   queued data. */
+	if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags |= FLAGS_DROP_DATA;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+		pkt_clear(garmin_data_p);
+	}
+
+	return count;
+}
+
+
+
+/*
+ * Called for data received from tty
+ *
+ * buf contains the data read, it may span more than one packet or even
+ * incomplete packets
+ *
+ * input record should be a serial-record, but it may not be complete.
+ * Copy it into our local buffer, until an etx is seen (or an error
+ * occurs).
+ * Once the record is complete, convert into a usb packet and send it
+ * to the bulk pipe, send an ack back to the tty.
+ *
+ * If the input is an ack, just send the last queued packet to the
+ * tty layer.
+ *
+ * if the input is an abort command, drop all queued data.
+ */
+
+static int gsp_receive(struct garmin_data *garmin_data_p,
+		       const unsigned char *buf, int count)
+{
+	struct device *dev = &garmin_data_p->port->dev;
+	unsigned long flags;
+	int offs = 0;
+	int ack_or_nak_seen = 0;
+	__u8 *dest;
+	int size;
+	/* dleSeen: set if last byte read was a DLE */
+	int dleSeen;
+	/* skip: if set, skip incoming data until possible start of
+	 *       new packet
+	 */
+	int skip;
+	__u8 data;
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	dest = garmin_data_p->inbuffer;
+	size = garmin_data_p->insize;
+	dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
+	skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	/* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n",
+		__func__, dleSeen, skip, size, count); */
+
+	if (size == 0)
+		size = GSP_INITIAL_OFFSET;
+
+	while (offs < count) {
+
+		data = *(buf+offs);
+		offs++;
+
+		if (data == DLE) {
+			if (skip) { /* start of a new pkt */
+				skip = 0;
+				size = GSP_INITIAL_OFFSET;
+				dleSeen = 1;
+			} else if (dleSeen) {
+				dest[size++] = data;
+				dleSeen = 0;
+			} else {
+				dleSeen = 1;
+			}
+		} else if (data == ETX) {
+			if (dleSeen) {
+				/* packet complete */
+
+				data = dest[GSP_INITIAL_OFFSET];
+
+				if (data == ACK) {
+					ack_or_nak_seen = ACK;
+					dev_dbg(dev, "ACK packet complete.\n");
+				} else if (data == NAK) {
+					ack_or_nak_seen = NAK;
+					dev_dbg(dev, "NAK packet complete.\n");
+				} else {
+					dev_dbg(dev, "packet complete - id=0x%X.\n",
+							data);
+					gsp_rec_packet(garmin_data_p, size);
+				}
+
+				skip = 1;
+				size = GSP_INITIAL_OFFSET;
+				dleSeen = 0;
+			} else {
+				dest[size++] = data;
+			}
+		} else if (!skip) {
+
+			if (dleSeen) {
+				size = GSP_INITIAL_OFFSET;
+				dleSeen = 0;
+			}
+
+			dest[size++] = data;
+		}
+
+		if (size >= GPS_IN_BUFSIZ) {
+			dev_dbg(dev, "%s - packet too large.\n", __func__);
+			skip = 1;
+			size = GSP_INITIAL_OFFSET;
+			dleSeen = 0;
+		}
+	}
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+
+	garmin_data_p->insize = size;
+
+	/* copy flags back to structure */
+	if (skip)
+		garmin_data_p->flags |= FLAGS_GSP_SKIP;
+	else
+		garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
+
+	if (dleSeen)
+		garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
+	else
+		garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
+
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	if (ack_or_nak_seen) {
+		if (gsp_next_packet(garmin_data_p) > 0)
+			garmin_data_p->state = STATE_ACTIVE;
+		else
+			garmin_data_p->state = STATE_GSP_WAIT_DATA;
+	}
+	return count;
+}
+
+
+
+/*
+ * Sends a usb packet to the tty
+ *
+ * Assumes, that all packages and at an usb-packet boundary.
+ *
+ * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
+ */
+static int gsp_send(struct garmin_data *garmin_data_p,
+		    const unsigned char *buf, int count)
+{
+	struct device *dev = &garmin_data_p->port->dev;
+	const unsigned char *src;
+	unsigned char *dst;
+	int pktid = 0;
+	int datalen = 0;
+	int cksum = 0;
+	int i = 0;
+	int k;
+
+	dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__,
+		garmin_data_p->state, count);
+
+	k = garmin_data_p->outsize;
+	if ((k+count) > GPS_OUT_BUFSIZ) {
+		dev_dbg(dev, "packet too large\n");
+		garmin_data_p->outsize = 0;
+		return -4;
+	}
+
+	memcpy(garmin_data_p->outbuffer+k, buf, count);
+	k += count;
+	garmin_data_p->outsize = k;
+
+	if (k >= GARMIN_PKTHDR_LENGTH) {
+		pktid  = getPacketId(garmin_data_p->outbuffer);
+		datalen = getDataLength(garmin_data_p->outbuffer);
+		i = GARMIN_PKTHDR_LENGTH + datalen;
+		if (k < i)
+			return 0;
+	} else {
+		return 0;
+	}
+
+	dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i);
+
+	/* garmin_data_p->outbuffer now contains a complete packet */
+
+	usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k,
+			      garmin_data_p->outbuffer);
+
+	garmin_data_p->outsize = 0;
+
+	if (getLayerId(garmin_data_p->outbuffer) != GARMIN_LAYERID_APPL) {
+		dev_dbg(dev, "not an application packet (%d)\n",
+				getLayerId(garmin_data_p->outbuffer));
+		return -1;
+	}
+
+	if (pktid > 255) {
+		dev_dbg(dev, "packet-id %d too large\n", pktid);
+		return -2;
+	}
+
+	if (datalen > 255) {
+		dev_dbg(dev, "packet-size %d too large\n", datalen);
+		return -3;
+	}
+
+	/* the serial protocol should be able to handle this packet */
+
+	k = 0;
+	src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
+	for (i = 0; i < datalen; i++) {
+		if (*src++ == DLE)
+			k++;
+	}
+
+	src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
+	if (k > (GARMIN_PKTHDR_LENGTH-2)) {
+		/* can't add stuffing DLEs in place, move data to end
+		   of buffer ... */
+		dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
+		memcpy(dst, src, datalen);
+		src = dst;
+	}
+
+	dst = garmin_data_p->outbuffer;
+
+	*dst++ = DLE;
+	*dst++ = pktid;
+	cksum += pktid;
+	*dst++ = datalen;
+	cksum += datalen;
+	if (datalen == DLE)
+		*dst++ = DLE;
+
+	for (i = 0; i < datalen; i++) {
+		__u8 c = *src++;
+		*dst++ = c;
+		cksum += c;
+		if (c == DLE)
+			*dst++ = DLE;
+	}
+
+	cksum = -cksum & 0xFF;
+	*dst++ = cksum;
+	if (cksum == DLE)
+		*dst++ = DLE;
+	*dst++ = DLE;
+	*dst++ = ETX;
+
+	i = dst-garmin_data_p->outbuffer;
+
+	send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
+
+	garmin_data_p->pkt_id = pktid;
+	garmin_data_p->state  = STATE_WAIT_TTY_ACK;
+
+	return i;
+}
+
+
+/*
+ * Process the next pending data packet - if there is one
+ */
+static int gsp_next_packet(struct garmin_data *garmin_data_p)
+{
+	int result = 0;
+	struct garmin_packet *pkt = NULL;
+
+	while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
+		dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq);
+		result = gsp_send(garmin_data_p, pkt->data, pkt->size);
+		if (result > 0) {
+			kfree(pkt);
+			return result;
+		}
+		kfree(pkt);
+	}
+	return result;
+}
+
+
+
+/******************************************************************************
+ * garmin native mode
+ ******************************************************************************/
+
+
+/*
+ * Called for data received from tty
+ *
+ * The input data is expected to be in garmin usb-packet format.
+ *
+ * buf contains the data read, it may span more than one packet
+ * or even incomplete packets
+ */
+static int nat_receive(struct garmin_data *garmin_data_p,
+		       const unsigned char *buf, int count)
+{
+	unsigned long flags;
+	__u8 *dest;
+	int offs = 0;
+	int result = count;
+	int len;
+
+	while (offs < count) {
+		/* if buffer contains header, copy rest of data */
+		if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
+			len = GARMIN_PKTHDR_LENGTH
+			      +getDataLength(garmin_data_p->inbuffer);
+		else
+			len = GARMIN_PKTHDR_LENGTH;
+
+		if (len >= GPS_IN_BUFSIZ) {
+			/* seems to be an invalid packet, ignore rest
+			   of input */
+			dev_dbg(&garmin_data_p->port->dev,
+				"%s - packet size too large: %d\n",
+				__func__, len);
+			garmin_data_p->insize = 0;
+			count = 0;
+			result = -EINVPKT;
+		} else {
+			len -= garmin_data_p->insize;
+			if (len > (count-offs))
+				len = (count-offs);
+			if (len > 0) {
+				dest = garmin_data_p->inbuffer
+						+ garmin_data_p->insize;
+				memcpy(dest, buf+offs, len);
+				garmin_data_p->insize += len;
+				offs += len;
+			}
+		}
+
+		/* do we have a complete packet ? */
+		if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
+			len = GARMIN_PKTHDR_LENGTH+
+			   getDataLength(garmin_data_p->inbuffer);
+			if (garmin_data_p->insize >= len) {
+				garmin_write_bulk(garmin_data_p->port,
+						   garmin_data_p->inbuffer,
+						   len, 0);
+				garmin_data_p->insize = 0;
+
+				/* if this was an abort-transfer command,
+				   flush all queued data. */
+				if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
+					spin_lock_irqsave(&garmin_data_p->lock,
+									flags);
+					garmin_data_p->flags |= FLAGS_DROP_DATA;
+					spin_unlock_irqrestore(
+						&garmin_data_p->lock, flags);
+					pkt_clear(garmin_data_p);
+				}
+			}
+		}
+	}
+	return result;
+}
+
+
+/******************************************************************************
+ * private packets
+ ******************************************************************************/
+
+static void priv_status_resp(struct usb_serial_port *port)
+{
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	__le32 *pkt = (__le32 *)garmin_data_p->privpkt;
+
+	pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
+	pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
+	pkt[2] = __cpu_to_le32(12);
+	pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
+	pkt[4] = __cpu_to_le32(garmin_data_p->mode);
+	pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
+
+	send_to_tty(port, (__u8 *)pkt, 6 * 4);
+}
+
+
+/******************************************************************************
+ * Garmin specific driver functions
+ ******************************************************************************/
+
+static int process_resetdev_request(struct usb_serial_port *port)
+{
+	unsigned long flags;
+	int status;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
+	garmin_data_p->state = STATE_RESET;
+	garmin_data_p->serial_num = 0;
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	usb_kill_urb(port->interrupt_in_urb);
+	dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__);
+	status = usb_reset_device(port->serial->dev);
+	if (status)
+		dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n",
+			__func__, status);
+	return status;
+}
+
+
+
+/*
+ * clear all cached data
+ */
+static int garmin_clear(struct garmin_data *garmin_data_p)
+{
+	unsigned long flags;
+
+	/* flush all queued data */
+	pkt_clear(garmin_data_p);
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	garmin_data_p->insize = 0;
+	garmin_data_p->outsize = 0;
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	return 0;
+}
+
+
+static int garmin_init_session(struct usb_serial_port *port)
+{
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	int status;
+	int i;
+
+	usb_kill_urb(port->interrupt_in_urb);
+
+	status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+	if (status) {
+		dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
+				status);
+		return status;
+	}
+
+	/*
+	 * using the initialization method from gpsbabel. See comments in
+	 * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
+	 */
+	dev_dbg(&port->dev, "%s - starting session ...\n", __func__);
+	garmin_data_p->state = STATE_ACTIVE;
+
+	for (i = 0; i < 3; i++) {
+		status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ,
+				sizeof(GARMIN_START_SESSION_REQ), 0);
+		if (status < 0)
+			goto err_kill_urbs;
+	}
+
+	return 0;
+
+err_kill_urbs:
+	usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
+	usb_kill_urb(port->interrupt_in_urb);
+
+	return status;
+}
+
+
+
+static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+	unsigned long flags;
+	int status = 0;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	garmin_data_p->mode  = initial_mode;
+	garmin_data_p->count = 0;
+	garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	/* shutdown any bulk reads that might be going on */
+	usb_kill_urb(port->read_urb);
+
+	if (garmin_data_p->state == STATE_RESET)
+		status = garmin_init_session(port);
+
+	garmin_data_p->state = STATE_ACTIVE;
+	return status;
+}
+
+
+static void garmin_close(struct usb_serial_port *port)
+{
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n",
+		__func__, garmin_data_p->mode, garmin_data_p->state,
+		garmin_data_p->flags);
+
+	garmin_clear(garmin_data_p);
+
+	/* shutdown our urbs */
+	usb_kill_urb(port->read_urb);
+	usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
+
+	/* keep reset state so we know that we must start a new session */
+	if (garmin_data_p->state != STATE_RESET)
+		garmin_data_p->state = STATE_DISCONNECTED;
+}
+
+
+static void garmin_write_bulk_callback(struct urb *urb)
+{
+	struct usb_serial_port *port = urb->context;
+
+	if (port) {
+		struct garmin_data *garmin_data_p =
+					usb_get_serial_port_data(port);
+
+		if (getLayerId(urb->transfer_buffer) == GARMIN_LAYERID_APPL) {
+
+			if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
+				gsp_send_ack(garmin_data_p,
+					((__u8 *)urb->transfer_buffer)[4]);
+			}
+		}
+		usb_serial_port_softint(port);
+	}
+
+	/* Ignore errors that resulted from garmin_write_bulk with
+	   dismiss_ack = 1 */
+
+	/* free up the transfer buffer, as usb_free_urb() does not do this */
+	kfree(urb->transfer_buffer);
+}
+
+
+static int garmin_write_bulk(struct usb_serial_port *port,
+			      const unsigned char *buf, int count,
+			      int dismiss_ack)
+{
+	unsigned long flags;
+	struct usb_serial *serial = port->serial;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	struct urb *urb;
+	unsigned char *buffer;
+	int status;
+
+	spin_lock_irqsave(&garmin_data_p->lock, flags);
+	garmin_data_p->flags &= ~FLAGS_DROP_DATA;
+	spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+	buffer = kmalloc(count, GFP_ATOMIC);
+	if (!buffer)
+		return -ENOMEM;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		kfree(buffer);
+		return -ENOMEM;
+	}
+
+	memcpy(buffer, buf, count);
+
+	usb_serial_debug_data(&port->dev, __func__, count, buffer);
+
+	usb_fill_bulk_urb(urb, serial->dev,
+				usb_sndbulkpipe(serial->dev,
+					port->bulk_out_endpointAddress),
+				buffer, count,
+				garmin_write_bulk_callback,
+				dismiss_ack ? NULL : port);
+	urb->transfer_flags |= URB_ZERO_PACKET;
+
+	if (getLayerId(buffer) == GARMIN_LAYERID_APPL) {
+
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags |= APP_REQ_SEEN;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+		if (garmin_data_p->mode == MODE_GARMIN_SERIAL)  {
+			pkt_clear(garmin_data_p);
+			garmin_data_p->state = STATE_GSP_WAIT_DATA;
+		}
+	}
+
+	/* send it down the pipe */
+	usb_anchor_urb(urb, &garmin_data_p->write_urbs);
+	status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (status) {
+		dev_err(&port->dev,
+		   "%s - usb_submit_urb(write bulk) failed with status = %d\n",
+				__func__, status);
+		count = status;
+		usb_unanchor_urb(urb);
+		kfree(buffer);
+	}
+
+	/* we are done with this urb, so let the host driver
+	 * really free it when it is finished with it */
+	usb_free_urb(urb);
+
+	return count;
+}
+
+static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
+					 const unsigned char *buf, int count)
+{
+	struct device *dev = &port->dev;
+	int pktid, pktsiz, len;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	__le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
+
+	usb_serial_debug_data(dev, __func__, count, buf);
+
+	if (garmin_data_p->state == STATE_RESET)
+		return -EIO;
+
+	/* check for our private packets */
+	if (count >= GARMIN_PKTHDR_LENGTH) {
+		len = PRIVPKTSIZ;
+		if (count < len)
+			len = count;
+
+		memcpy(garmin_data_p->privpkt, buf, len);
+
+		pktsiz = getDataLength(garmin_data_p->privpkt);
+		pktid  = getPacketId(garmin_data_p->privpkt);
+
+		if (count == (GARMIN_PKTHDR_LENGTH + pktsiz) &&
+				getLayerId(garmin_data_p->privpkt) ==
+						GARMIN_LAYERID_PRIVATE) {
+
+			dev_dbg(dev, "%s - processing private request %d\n",
+				__func__, pktid);
+
+			/* drop all unfinished transfers */
+			garmin_clear(garmin_data_p);
+
+			switch (pktid) {
+			case PRIV_PKTID_SET_MODE:
+				if (pktsiz != 4)
+					return -EINVPKT;
+				garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
+				dev_dbg(dev, "%s - mode set to %d\n",
+					__func__, garmin_data_p->mode);
+				break;
+
+			case PRIV_PKTID_INFO_REQ:
+				priv_status_resp(port);
+				break;
+
+			case PRIV_PKTID_RESET_REQ:
+				process_resetdev_request(port);
+				break;
+
+			case PRIV_PKTID_SET_DEF_MODE:
+				if (pktsiz != 4)
+					return -EINVPKT;
+				initial_mode = __le32_to_cpu(privpkt[3]);
+				dev_dbg(dev, "%s - initial_mode set to %d\n",
+					__func__,
+					garmin_data_p->mode);
+				break;
+			}
+			return count;
+		}
+	}
+
+	if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
+		return gsp_receive(garmin_data_p, buf, count);
+	} else {	/* MODE_NATIVE */
+		return nat_receive(garmin_data_p, buf, count);
+	}
+}
+
+
+static int garmin_write_room(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	/*
+	 * Report back the bytes currently available in the output buffer.
+	 */
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
+}
+
+
+static void garmin_read_process(struct garmin_data *garmin_data_p,
+				 unsigned char *data, unsigned data_length,
+				 int bulk_data)
+{
+	unsigned long flags;
+
+	if (garmin_data_p->flags & FLAGS_DROP_DATA) {
+		/* abort-transfer cmd is active */
+		dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__);
+	} else if (garmin_data_p->state != STATE_DISCONNECTED &&
+		garmin_data_p->state != STATE_RESET) {
+
+		/* if throttling is active or postprecessing is required
+		   put the received data in the input queue, otherwise
+		   send it directly to the tty port */
+		if (garmin_data_p->flags & FLAGS_QUEUING) {
+			pkt_add(garmin_data_p, data, data_length);
+		} else if (bulk_data || (data_length >= sizeof(u32) &&
+				getLayerId(data) == GARMIN_LAYERID_APPL)) {
+
+			spin_lock_irqsave(&garmin_data_p->lock, flags);
+			garmin_data_p->flags |= APP_RESP_SEEN;
+			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+			if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
+				pkt_add(garmin_data_p, data, data_length);
+			} else {
+				send_to_tty(garmin_data_p->port, data,
+						data_length);
+			}
+		}
+		/* ignore system layer packets ... */
+	}
+}
+
+
+static void garmin_read_bulk_callback(struct urb *urb)
+{
+	unsigned long flags;
+	struct usb_serial_port *port = urb->context;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	unsigned char *data = urb->transfer_buffer;
+	int status = urb->status;
+	int retval;
+
+	if (status) {
+		dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n",
+			__func__, status);
+		return;
+	}
+
+	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
+
+	garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
+
+	if (urb->actual_length == 0 &&
+			(garmin_data_p->flags & FLAGS_BULK_IN_RESTART) != 0) {
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+		retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+		if (retval)
+			dev_err(&port->dev,
+				"%s - failed resubmitting read urb, error %d\n",
+				__func__, retval);
+	} else if (urb->actual_length > 0) {
+		/* Continue trying to read until nothing more is received  */
+		if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
+			retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+			if (retval)
+				dev_err(&port->dev,
+					"%s - failed resubmitting read urb, error %d\n",
+					__func__, retval);
+		}
+	} else {
+		dev_dbg(&port->dev, "%s - end of bulk data\n", __func__);
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+	}
+}
+
+
+static void garmin_read_int_callback(struct urb *urb)
+{
+	unsigned long flags;
+	int retval;
+	struct usb_serial_port *port = urb->context;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	unsigned char *data = urb->transfer_buffer;
+	int status = urb->status;
+
+	switch (status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
+			__func__, status);
+		return;
+	default:
+		dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
+			__func__, status);
+		return;
+	}
+
+	usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
+			      urb->transfer_buffer);
+
+	if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
+		memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
+				sizeof(GARMIN_BULK_IN_AVAIL_REPLY)) == 0) {
+
+		dev_dbg(&port->dev, "%s - bulk data available.\n", __func__);
+
+		if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) == 0) {
+
+			/* bulk data available */
+			retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+			if (retval) {
+				dev_err(&port->dev,
+				 "%s - failed submitting read urb, error %d\n",
+							__func__, retval);
+			} else {
+				spin_lock_irqsave(&garmin_data_p->lock, flags);
+				garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
+				spin_unlock_irqrestore(&garmin_data_p->lock,
+									flags);
+			}
+		} else {
+			/* bulk-in transfer still active */
+			spin_lock_irqsave(&garmin_data_p->lock, flags);
+			garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
+			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+		}
+
+	} else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
+			 && memcmp(data, GARMIN_START_SESSION_REPLY,
+				 sizeof(GARMIN_START_SESSION_REPLY)) == 0) {
+
+		spin_lock_irqsave(&garmin_data_p->lock, flags);
+		garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
+		spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+		/* save the serial number */
+		garmin_data_p->serial_num = __le32_to_cpup(
+					(__le32 *)(data+GARMIN_PKTHDR_LENGTH));
+
+		dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n",
+			__func__, garmin_data_p->serial_num);
+	}
+
+	garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
+
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval)
+		dev_err(&urb->dev->dev,
+			"%s - Error %d submitting interrupt urb\n",
+			__func__, retval);
+}
+
+
+/*
+ * Sends the next queued packt to the tty port (garmin native mode only)
+ * and then sets a timer to call itself again until all queued data
+ * is sent.
+ */
+static int garmin_flush_queue(struct garmin_data *garmin_data_p)
+{
+	unsigned long flags;
+	struct garmin_packet *pkt;
+
+	if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
+		pkt = pkt_pop(garmin_data_p);
+		if (pkt != NULL) {
+			send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
+			kfree(pkt);
+			mod_timer(&garmin_data_p->timer, (1)+jiffies);
+
+		} else {
+			spin_lock_irqsave(&garmin_data_p->lock, flags);
+			garmin_data_p->flags &= ~FLAGS_QUEUING;
+			spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+		}
+	}
+	return 0;
+}
+
+
+static void garmin_throttle(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	/* set flag, data received will be put into a queue
+	   for later processing */
+	spin_lock_irq(&garmin_data_p->lock);
+	garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
+	spin_unlock_irq(&garmin_data_p->lock);
+}
+
+
+static void garmin_unthrottle(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+	int status;
+
+	spin_lock_irq(&garmin_data_p->lock);
+	garmin_data_p->flags &= ~FLAGS_THROTTLED;
+	spin_unlock_irq(&garmin_data_p->lock);
+
+	/* in native mode send queued data to tty, in
+	   serial mode nothing needs to be done here */
+	if (garmin_data_p->mode == MODE_NATIVE)
+		garmin_flush_queue(garmin_data_p);
+
+	if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) != 0) {
+		status = usb_submit_urb(port->read_urb, GFP_KERNEL);
+		if (status)
+			dev_err(&port->dev,
+				"%s - failed resubmitting read urb, error %d\n",
+				__func__, status);
+	}
+}
+
+/*
+ * The timer is currently only used to send queued packets to
+ * the tty in cases where the protocol provides no own handshaking
+ * to initiate the transfer.
+ */
+static void timeout_handler(struct timer_list *t)
+{
+	struct garmin_data *garmin_data_p = from_timer(garmin_data_p, t, timer);
+
+	/* send the next queued packet to the tty port */
+	if (garmin_data_p->mode == MODE_NATIVE)
+		if (garmin_data_p->flags & FLAGS_QUEUING)
+			garmin_flush_queue(garmin_data_p);
+}
+
+
+
+static int garmin_port_probe(struct usb_serial_port *port)
+{
+	int status;
+	struct garmin_data *garmin_data_p;
+
+	garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
+	if (!garmin_data_p)
+		return -ENOMEM;
+
+	timer_setup(&garmin_data_p->timer, timeout_handler, 0);
+	spin_lock_init(&garmin_data_p->lock);
+	INIT_LIST_HEAD(&garmin_data_p->pktlist);
+	garmin_data_p->port = port;
+	garmin_data_p->state = 0;
+	garmin_data_p->flags = 0;
+	garmin_data_p->count = 0;
+	init_usb_anchor(&garmin_data_p->write_urbs);
+	usb_set_serial_port_data(port, garmin_data_p);
+
+	status = garmin_init_session(port);
+	if (status)
+		goto err_free;
+
+	return 0;
+err_free:
+	kfree(garmin_data_p);
+
+	return status;
+}
+
+
+static int garmin_port_remove(struct usb_serial_port *port)
+{
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
+	usb_kill_urb(port->interrupt_in_urb);
+	del_timer_sync(&garmin_data_p->timer);
+	kfree(garmin_data_p);
+	return 0;
+}
+
+
+/* All of the device info needed */
+static struct usb_serial_driver garmin_device = {
+	.driver = {
+		.owner       = THIS_MODULE,
+		.name        = "garmin_gps",
+	},
+	.description         = "Garmin GPS usb/tty",
+	.id_table            = id_table,
+	.num_ports           = 1,
+	.open                = garmin_open,
+	.close               = garmin_close,
+	.throttle            = garmin_throttle,
+	.unthrottle          = garmin_unthrottle,
+	.port_probe		= garmin_port_probe,
+	.port_remove		= garmin_port_remove,
+	.write               = garmin_write,
+	.write_room          = garmin_write_room,
+	.write_bulk_callback = garmin_write_bulk_callback,
+	.read_bulk_callback  = garmin_read_bulk_callback,
+	.read_int_callback   = garmin_read_int_callback,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&garmin_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param(initial_mode, int, S_IRUGO);
+MODULE_PARM_DESC(initial_mode, "Initial mode");