Re: [PATCH] USB and Driver Core patches for 2.6.10

Greg KH
2005-01-08T06:19:33Z

ChangeSet 1.1938.446.36, 2004/12/17 15:40:33-08:00, hkneissel@t-online.de

[PATCH] Re: garmin gps driver patch 0.23

From: Hermann Kneissel <hkneissel@t-online.de>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/serial/Kconfig | 13
drivers/usb/serial/Makefile | 1
drivers/usb/serial/garmin_gps.c | 1542 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1556 insertions(+)

diff -Nru a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
--- a/drivers/usb/serial/Kconfig 2005-01-07 15:44:51 -08:00
+++ b/drivers/usb/serial/Kconfig 2005-01-07 15:44:51 -08:00
@@ -202,6 +202,19 @@
To compile this driver as a module, choose M here: the
module will be called io_ti.

+config USB_SERIAL_GARMIN
+ tristate "Garmin GPS driver"
+ depends on USB_SERIAL
+ help
+ Say Y here if you want to connect to your Garmin GPS.
+ Should work with most Garmin GPS devices which have a native USB port.
+
+ See <http://sourceforge.net/projects/garmin-gps> for the latest
+ version of the driver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called garmin_gps.
+
config USB_SERIAL_IPW
tristate "USB IPWireless (3G UMTS TDD) Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
diff -Nru a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
--- a/drivers/usb/serial/Makefile 2005-01-07 15:44:51 -08:00
+++ b/drivers/usb/serial/Makefile 2005-01-07 15:44:51 -08:00
@@ -19,6 +19,7 @@
obj-$(CONFIG_USB_SERIAL_EDGEPORT_TI) += io_ti.o
obj-$(CONFIG_USB_SERIAL_EMPEG) += empeg.o
obj-$(CONFIG_USB_SERIAL_FTDI_SIO) += ftdi_sio.o
+obj-$(CONFIG_USB_SERIAL_GARMIN) += garmin_gps.o
obj-$(CONFIG_USB_SERIAL_IPAQ) += ipaq.o
obj-$(CONFIG_USB_SERIAL_IPW) += ipw.o
obj-$(CONFIG_USB_SERIAL_IR) += ir-usb.o
diff -Nru a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/usb/serial/garmin_gps.c 2005-01-07 15:44:51 -08:00
@@ -0,0 +1,1542 @@
+/*
+ * Garmin GPS driver
+ *
+ * Copyright (C) 2004 Hermann Kneissel hkneissel@t-online.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.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.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 <asm/uaccess.h>
+#include <linux/usb.h>
+
+/* the mode to be set when the port ist opened */
+static int initial_mode = 1;
+
+/* debug flag */
+static int debug = 0;
+
+#include "usb-serial.h"
+
+#define GARMIN_VENDOR_ID 0x091E
+
+/*
+ * Version Information
+ */
+
+#define VERSION_MAJOR 0
+#define VERSION_MINOR 23
+
+#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;
+ int size; // the real size of the data array, always > 0
+ __u8 data[1];
+};
+
+/* structure used to keep the current state of the driver */
+struct garmin_data {
+ __u8 state;
+ __u16 flags;
+ __u8 mode;
+ __u8 ignorePkts;
+ __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;
+};
+
+
+#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_THROTTLED 0x0010
+#define CLEAR_HALT_REQUIRED 0x0001
+
+#define FLAGS_QUEUING 0x0100
+#define FLAGS_APP_RESP_SEEN 0x0200
+#define FLAGS_APP_REQ_SEEN 0x0400
+#define FLAGS_DROP_DATA 0x0800
+
+#define FLAGS_GSP_SKIP 0x1000
+#define FLAGS_GSP_DLESEEN 0x2000
+
+
+
+
+
+
+/* function prototypes */
+static void 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);
+
+/* 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_REQ2[]
+ = { 0, 0, 0, 0, 16, 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_SESSION_ACTIVE_REPLY[]
+ = { 0, 0, 0, 0, 17, 0, 0, 0, 4, 0, 0, 0, 0, 16, 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_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 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 };
+static unsigned char const PRIVATE_REQ[]
+ = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
+
+
+
+static 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 struct usb_driver garmin_driver = {
+ .owner = THIS_MODULE,
+ .name = "garmin_gps",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table,
+};
+
+
+static inline int noResponseFromAppLayer(struct garmin_data * garmin_data_p)
+{
+ return ((garmin_data_p->flags
+ & (FLAGS_APP_REQ_SEEN|FLAGS_APP_RESP_SEEN))
+ == FLAGS_APP_REQ_SEEN);
+}
+
+
+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 (0 == 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)))
+ return 1;
+ else
+ return 0;
+}
+
+
+
+static void send_to_tty(struct usb_serial_port *port,
+ char *data, unsigned int actual_length)
+{
+ struct tty_struct *tty = port->tty;
+ int i;
+
+ if (tty && actual_length) {
+
+ usb_serial_debug_data(debug, &port->dev,
+ __FUNCTION__, actual_length, data);
+
+ for (i = 0; i < actual_length ; ++i) {
+ /* if we insert more than TTY_FLIPBUF_SIZE characters,
+ we drop them. */
+ if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
+ tty_flip_buffer_push(tty);
+ }
+ /* this doesn't actually push the data through unless
+ tty->low_latency is set */
+ tty_insert_flip_char(tty, data[i], 0);
+ }
+ tty_flip_buffer_push(tty);
+ }
+}
+
+
+/******************************************************************************
+ * 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 result = 0;
+ unsigned long flags;
+ struct garmin_packet *pkt;
+
+ /* process only packets containg data ... */
+ if (data_length) {
+ garmin_data_p->flags |= FLAGS_QUEUING;
+ pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
+ GFP_ATOMIC);
+ if (pkt == 0) {
+ dev_err(&garmin_data_p->port->dev, "out of memory\n");
+ return 0;
+ }
+ pkt->size = data_length;
+ memcpy(pkt->data, data, data_length);
+
+ spin_lock_irqsave(&garmin_data_p->lock, flags);
+ result = list_empty(&garmin_data_p->pktlist);
+ pkt->seq = garmin_data_p->seq_counter++;
+ list_add_tail(&pkt->list, &garmin_data_p->pktlist);
+ spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+ /* in serial mode, if someone is waiting for data from
+ the device, iconvert and send the next packet to tty. */
+ if (result && (garmin_data_p->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 = 0;
+
+ 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 = 0;
+
+ dbg("%s", __FUNCTION__);
+
+ 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;
+
+ dbg("%s - pkt-id: 0x%X.", __FUNCTION__, 0xFF & 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++ = 0xFF & (-cksum);
+ *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 (pkzid ... 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)
+{
+ 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(debug, &garmin_data_p->port->dev,
+ __FUNCTION__, count-GSP_INITIAL_OFFSET, recpkt);
+
+ if (size != (count-GSP_INITIAL_OFFSET-3)) {
+ dbg("%s - invalid size, expected %d bytes, got %d",
+ __FUNCTION__, size, (count-GSP_INITIAL_OFFSET-3));
+ return -EINVPKT;
+ }
+
+ cksum += *recpkt++;
+ cksum += *recpkt++;
+
+ // sanity check, remove after test ...
+ if ((__u8*)&(usbdata[3]) != recpkt) {
+ dbg("%s - ptr mismatch %p - %p",
+ __FUNCTION__, &(usbdata[4]), recpkt);
+ return -EINVPKT;
+ }
+
+ while (n < size) {
+ cksum += *recpkt++;
+ n++;
+ }
+
+ if ((0xff & (cksum + *recpkt)) != 0) {
+ dbg("%s - invalid checksum, expected %02x, got %02x",
+ __FUNCTION__, 0xff & -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);
+
+ /* if this was an abort-transfer command, flush all
+ queued data. */
+ if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
+ garmin_data_p->flags |= FLAGS_DROP_DATA;
+ 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)
+{
+ int offs = 0;
+ int ack_or_nak_seen = 0;
+ int i = 0;
+ __u8 *dest = garmin_data_p->inbuffer;
+ int size = garmin_data_p->insize;
+ // dleSeen: set if last byte read was a DLE
+ int dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
+ // skip: if set, skip incoming data until possible start of
+ // new packet
+ int skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
+ __u8 data;
+
+ dbg("%s - dle=%d skip=%d size=%d count=%d",
+ __FUNCTION__, 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;
+ dbg("ACK packet complete.");
+ } else if (data == NAK) {
+ ack_or_nak_seen = NAK;
+ dbg("NAK packet complete.");
+ } else {
+ dbg("packet complete "
+ "- id=0x%X.",
+ 0xFF & 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) {
+ dbg("non-masked DLE at %d - restarting", i);
+ size = GSP_INITIAL_OFFSET;
+ dleSeen = 0;
+ }
+
+ dest[size++] = data;
+ }
+
+ if (size >= GPS_IN_BUFSIZ) {
+ dbg("%s - packet too large.", __FUNCTION__);
+ skip = 1;
+ size = GSP_INITIAL_OFFSET;
+ dleSeen = 0;
+ }
+ }
+
+ 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;
+
+ if (ack_or_nak_seen) {
+ garmin_data_p->state = STATE_GSP_WAIT_DATA;
+ gsp_next_packet(garmin_data_p);
+ }
+
+ 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
+ */
+int gsp_send(struct garmin_data * garmin_data_p, const unsigned char *buf,
+ int count)
+{
+ const unsigned char *src;
+ unsigned char *dst;
+ int pktid = 0;
+ int datalen = 0;
+ int cksum = 0;
+ int i=0;
+ int k;
+
+ dbg("%s - state %d - %d bytes.", __FUNCTION__,
+ garmin_data_p->state, count);
+
+ k = garmin_data_p->outsize;
+ if ((k+count) > GPS_OUT_BUFSIZ) {
+ dbg("packet too large");
+ 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;
+ }
+
+ dbg("%s - %d bytes in buffer, %d bytes in pkt.", __FUNCTION__,
+ k, i);
+
+ /* garmin_data_p->outbuffer now contains a complete packet */
+
+ usb_serial_debug_data(debug, &garmin_data_p->port->dev,
+ __FUNCTION__, k, garmin_data_p->outbuffer);
+
+ garmin_data_p->outsize = 0;
+
+ if (GARMIN_LAYERID_APPL != getLayerId(garmin_data_p->outbuffer)) {
+ dbg("not an application packet (%d)",
+ getLayerId(garmin_data_p->outbuffer));
+ return -1;
+ }
+
+ if (pktid > 255) {
+ dbg("packet-id %d too large", pktid);
+ return -2;
+ }
+
+ if (datalen > 255) {
+ dbg("packet-size %d too large", 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 = 0xFF & -cksum;
+ *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 void gsp_next_packet(struct garmin_data * garmin_data_p)
+{
+ struct garmin_packet *pkt = 0;
+
+ while ((pkt = pkt_pop(garmin_data_p)) != 0)
+ {
+ dbg("%s - next pkt: %d", __FUNCTION__, pkt->seq);
+ if (gsp_send(garmin_data_p, pkt->data, pkt->size) > 0) {
+ kfree(pkt);
+ return;
+ }
+ kfree(pkt);
+ }
+}
+
+
+
+
+/******************************************************************************
+ * 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)
+{
+ __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) {
+ /* seem to be an invalid packet, ignore rest of input */
+ dbg("%s - packet size too large: %d",
+ __FUNCTION__, 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);
+ garmin_data_p->insize = 0;
+
+ /* if this was an abort-transfer command,
+ flush all queued data. */
+ if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
+ garmin_data_p->flags |= FLAGS_DROP_DATA;
+ 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)
+{
+ int status;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
+ garmin_data_p->state = STATE_RESET;
+ garmin_data_p->serial_num = 0;
+
+ usb_kill_urb (port->interrupt_in_urb);
+ dbg("%s - usb_reset_device", __FUNCTION__ );
+ status = usb_reset_device(port->serial->dev);
+ if (status)
+ dbg("%s - usb_reset_device failed: %d",
+ __FUNCTION__, status);
+ return status;
+}
+
+
+
+/*
+ * clear all cached data
+ */
+static int garmin_clear(struct garmin_data * garmin_data_p)
+{
+ int status = 0;
+
+ struct usb_serial_port *port = garmin_data_p->port;
+
+ if (port != 0 && garmin_data_p->flags & FLAGS_APP_RESP_SEEN) {
+ /* send a terminate command */
+ status = garmin_write_bulk(port, GARMIN_STOP_TRANSFER_REQ,
+ sizeof(GARMIN_STOP_TRANSFER_REQ));
+ }
+
+ /* flush all queued data */
+ pkt_clear(garmin_data_p);
+
+ garmin_data_p->insize = 0;
+ garmin_data_p->outsize = 0;
+
+ return status;
+}
+
+
+
+
+
+
+static int garmin_init_session(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+ int status = 0;
+
+ if (status == 0) {
+ usb_kill_urb (port->interrupt_in_urb);
+
+ dbg("%s - adding interrupt input", __FUNCTION__);
+ port->interrupt_in_urb->dev = serial->dev;
+ status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (status)
+ dev_err(&serial->dev->dev,
+ "%s - failed submitting interrupt urb,"
+ " error %d\n",
+ __FUNCTION__, status);
+ }
+
+ if (status == 0) {
+ dbg("%s - starting session ...", __FUNCTION__);
+ garmin_data_p->state = STATE_ACTIVE;
+ status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ,
+ sizeof(GARMIN_START_SESSION_REQ));
+
+ if (status >= 0) {
+
+ garmin_data_p->ignorePkts++;
+
+ /* not needed, but the win32 driver does it too ... */
+ status = garmin_write_bulk(port,
+ GARMIN_START_SESSION_REQ2,
+ sizeof(GARMIN_START_SESSION_REQ2));
+ if (status >= 0) {
+ status = 0;
+ garmin_data_p->ignorePkts++;
+ }
+ }
+ }
+
+ return status;
+}
+
+
+
+
+
+static int garmin_open (struct usb_serial_port *port, struct file *filp)
+{
+ int status = 0;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /*
+ * Force low_latency on so that our tty_push actually forces the data
+ * through, otherwise it is scheduled, and with high data rates (like
+ * with OHCI) data can get lost.
+ */
+ if (port->tty)
+ port->tty->low_latency = 1;
+
+ garmin_data_p->mode = initial_mode;
+ garmin_data_p->count = 0;
+ garmin_data_p->flags = 0;
+
+ /* shutdown any bulk reads that might be going on */
+ usb_kill_urb (port->write_urb);
+ 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 file * filp)
+{
+ struct usb_serial *serial = port->serial;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ dbg("%s - port %d - mode=%d state=%d flags=0x%X", __FUNCTION__,
+ port->number, garmin_data_p->mode,
+ garmin_data_p->state, garmin_data_p->flags);
+
+ if (!serial)
+ return;
+
+ garmin_clear(garmin_data_p);
+
+ /* shutdown our urbs */
+ usb_kill_urb (port->read_urb);
+ usb_kill_urb (port->write_urb);
+
+ if (noResponseFromAppLayer(garmin_data_p) ||
+ ((garmin_data_p->flags & CLEAR_HALT_REQUIRED) != 0)) {
+ process_resetdev_request(port);
+ garmin_data_p->state = STATE_RESET;
+ } else {
+ garmin_data_p->state = STATE_DISCONNECTED;
+ }
+}
+
+
+static void garmin_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
+{
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ /* free up the transfer buffer, as usb_free_urb() does not do this */
+ kfree (urb->transfer_buffer);
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (urb->status) {
+ dbg("%s - nonzero write bulk status received: %d",
+ __FUNCTION__, urb->status);
+ garmin_data_p->flags |= CLEAR_HALT_REQUIRED;
+ }
+
+ schedule_work(&port->work);
+}
+
+
+static int garmin_write_bulk (struct usb_serial_port *port,
+ const unsigned char *buf, int count)
+{
+ 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;
+
+ dbg("%s - port %d, state %d", __FUNCTION__, port->number,
+ garmin_data_p->state);
+
+ garmin_data_p->flags &= ~FLAGS_DROP_DATA;
+
+ buffer = kmalloc (count, GFP_ATOMIC);
+ if (!buffer) {
+ dev_err(&port->dev, "out of memory\n");
+ return -ENOMEM;
+ }
+
+ urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (!urb) {
+ dev_err(&port->dev, "no more free urbs\n");
+ kfree (buffer);
+ return -ENOMEM;
+ }
+
+ memcpy (buffer, buf, count);
+
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
+
+ usb_fill_bulk_urb (urb, serial->dev,
+ usb_sndbulkpipe (serial->dev,
+ port->bulk_out_endpointAddress),
+ buffer, count,
+ garmin_write_bulk_callback, port);
+ urb->transfer_flags |= URB_ZERO_PACKET;
+
+ if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
+ garmin_data_p->flags |= FLAGS_APP_REQ_SEEN;
+ 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 */
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (status) {
+ dev_err(&port->dev,
+ "%s - usb_submit_urb(write bulk) "
+ "failed with status = %d\n",
+ __FUNCTION__, status);
+ count = status;
+ } else {
+
+ if (GARMIN_LAYERID_APPL == getLayerId(buffer)
+ && (garmin_data_p->mode == MODE_GARMIN_SERIAL)) {
+
+ gsp_send_ack(garmin_data_p, buffer[4]);
+ }
+ }
+
+ /* 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 usb_serial_port *port,
+ const unsigned char *buf, int count)
+{
+ 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(debug, &port->dev, __FUNCTION__, count, buf);
+
+ /* 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)
+ && GARMIN_LAYERID_PRIVATE == getLayerId(garmin_data_p->privpkt)) {
+
+ dbg("%s - processing private request %d",
+ __FUNCTION__, pktid);
+
+ // drop all unfinished transfers
+ garmin_clear(garmin_data_p);
+
+ switch(pktid) {
+
+ case PRIV_PKTID_SET_DEBUG:
+ if (pktsiz != 4)
+ return -EINVPKT;
+ debug = __le32_to_cpu(privpkt[3]);
+ dbg("%s - debug level set to 0x%X",
+ __FUNCTION__, debug);
+ break;
+
+ case PRIV_PKTID_SET_MODE:
+ if (pktsiz != 4)
+ return -EINVPKT;
+ garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
+ dbg("%s - mode set to %d",
+ __FUNCTION__, garmin_data_p->mode);
+ break;
+
+ case PRIV_PKTID_INFO_REQ:
+ priv_status_resp(port);
+ break;
+
+ case PRIV_PKTID_RESET_REQ:
+ garmin_data_p->flags |= FLAGS_APP_REQ_SEEN;
+ break;
+
+ case PRIV_PKTID_SET_DEF_MODE:
+ if (pktsiz != 4)
+ return -EINVPKT;
+ initial_mode = __le32_to_cpu(privpkt[3]);
+ dbg("%s - initial_mode set to %d",
+ __FUNCTION__,
+ 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 usb_serial_port *port)
+{
+ /*
+ * 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 int garmin_chars_in_buffer (struct usb_serial_port *port)
+{
+ /*
+ * Report back the number of bytes currently in our input buffer.
+ * Will this lock up the driver - the buffer contains an incomplete
+ * package which will not be written to the device until it
+ * has been completed ?
+ */
+ //struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+ //return garmin_data_p->insize;
+ return 0;
+}
+
+
+static void garmin_read_process(struct garmin_data * garmin_data_p,
+ unsigned char *data, unsigned data_length)
+{
+ if (garmin_data_p->flags & FLAGS_DROP_DATA) {
+ /* abort-transfer cmd is actice */
+ dbg("%s - pkt dropped", __FUNCTION__);
+ } else if (garmin_data_p->state != STATE_DISCONNECTED &&
+ garmin_data_p->state != STATE_RESET ) {
+
+ /* remember any appl.layer packets, so we know
+ if a reset is required or not when closing
+ the device */
+ if (0 == memcmp(data, GARMIN_APP_LAYER_REPLY,
+ sizeof(GARMIN_APP_LAYER_REPLY)))
+ garmin_data_p->flags |= FLAGS_APP_RESP_SEEN;
+
+ /* if throttling is active or postprecessing is required
+ put the received data in th 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 (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
+ if (getLayerId(data) == GARMIN_LAYERID_APPL) {
+ pkt_add(garmin_data_p, data, data_length);
+ }
+ } else {
+ send_to_tty(garmin_data_p->port, data, data_length);
+ }
+ }
+}
+
+
+static void garmin_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
+{
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ struct usb_serial *serial = port->serial;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+ unsigned char *data = urb->transfer_buffer;
+ int status;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (!serial) {
+ dbg("%s - bad serial pointer, exiting", __FUNCTION__);
+ return;
+ }
+
+ if (urb->status) {
+ dbg("%s - nonzero read bulk status received: %d",
+ __FUNCTION__, urb->status);
+ return;
+ }
+
+ usb_serial_debug_data(debug, &port->dev,
+ __FUNCTION__, urb->actual_length, data);
+
+ garmin_read_process(garmin_data_p, data, urb->actual_length);
+
+ /* Continue trying to read until nothing more is received */
+ if (urb->actual_length > 0) {
+ usb_fill_bulk_urb (port->read_urb, serial->dev,
+ usb_rcvbulkpipe (serial->dev,
+ port->bulk_in_endpointAddress),
+ port->read_urb->transfer_buffer,
+ port->read_urb->transfer_buffer_length,
+ garmin_read_bulk_callback, port);
+ status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+ if (status)
+ dev_err(&port->dev,
+ "%s - failed resubmitting read urb, error %d\n",
+ __FUNCTION__, status);
+ }
+ return;
+}
+
+
+static void garmin_read_int_callback (struct urb *urb, struct pt_regs *regs)
+{
+ int status;
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ struct usb_serial *serial = port->serial;
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+ unsigned char *data = urb->transfer_buffer;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dbg("%s - urb shutting down with status: %d",
+ __FUNCTION__, urb->status);
+ return;
+ default:
+ dbg("%s - nonzero urb status received: %d",
+ __FUNCTION__, urb->status);
+ return;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
+ urb->actual_length, urb->transfer_buffer);
+
+ if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
+ 0 == memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
+ sizeof(GARMIN_BULK_IN_AVAIL_REPLY))) {
+
+ dbg("%s - bulk data available.", __FUNCTION__);
+
+ /* bulk data available */
+ usb_fill_bulk_urb (port->read_urb, serial->dev,
+ usb_rcvbulkpipe (serial->dev,
+ port->bulk_in_endpointAddress),
+ port->read_urb->transfer_buffer,
+ port->read_urb->transfer_buffer_length,
+ garmin_read_bulk_callback, port);
+ status = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ if (status) {
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
+ __FUNCTION__, status);
+ }
+
+ } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
+ && 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
+ sizeof(GARMIN_START_SESSION_REPLY))) {
+
+ garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
+
+ /* save the serial number */
+ garmin_data_p->serial_num
+ = __le32_to_cpup((__le32*)(data+GARMIN_PKTHDR_LENGTH));
+
+ dbg("%s - start-of-session reply seen - serial %u.",
+ __FUNCTION__, garmin_data_p->serial_num);
+ }
+
+ if (garmin_data_p->ignorePkts) {
+ /* this reply belongs to a request generated by the driver,
+ ignore it. */
+ dbg("%s - pkt ignored (%d)",
+ __FUNCTION__, garmin_data_p->ignorePkts);
+ garmin_data_p->ignorePkts--;
+ } else {
+ garmin_read_process(garmin_data_p, data, urb->actual_length);
+ }
+
+ port->interrupt_in_urb->dev = port->serial->dev;
+ status = usb_submit_urb (urb, GFP_ATOMIC);
+ if (status)
+ dev_err(&urb->dev->dev,
+ "%s - Error %d submitting interrupt urb\n",
+ __FUNCTION__, status);
+}
+
+
+/*
+ * 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)
+{
+ struct garmin_packet *pkt;
+
+ if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
+ pkt = pkt_pop(garmin_data_p);
+ if (pkt != 0) {
+
+ send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
+ kfree(pkt);
+ mod_timer(&garmin_data_p->timer, (1)+jiffies);
+
+ } else {
+ garmin_data_p->flags &= ~FLAGS_QUEUING;
+ }
+ }
+ return 0;
+}
+
+
+static void garmin_throttle (struct usb_serial_port *port)
+{
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+ /* set flag, data received will be put into a queue
+ for later processing */
+ garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
+}
+
+
+static void garmin_unthrottle (struct usb_serial_port *port)
+{
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+ garmin_data_p->flags &= ~FLAGS_THROTTLED;
+
+ /* 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);
+}
+
+
+
+/*
+ * 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(unsigned long data)
+{
+ struct garmin_data *garmin_data_p = (struct garmin_data *) data;
+
+ /* 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_attach (struct usb_serial *serial)
+{
+ int status = 0;
+ struct usb_serial_port *port = serial->port[0];
+ struct garmin_data * garmin_data_p = 0;
+
+ dbg("%s", __FUNCTION__);
+
+ garmin_data_p = kmalloc (sizeof(struct garmin_data), GFP_KERNEL);
+ if (garmin_data_p == NULL) {
+ dev_err(&port->dev, "%s - Out of memory\n", __FUNCTION__);
+ return -ENOMEM;
+ }
+ memset (garmin_data_p, 0, sizeof(struct garmin_data));
+ init_timer(&garmin_data_p->timer);
+ spin_lock_init(&garmin_data_p->lock);
+ INIT_LIST_HEAD(&garmin_data_p->pktlist);
+ //garmin_data_p->timer.expires = jiffies + session_timeout;
+ garmin_data_p->timer.data = (unsigned long)garmin_data_p;
+ garmin_data_p->timer.function = timeout_handler;
+ garmin_data_p->port = port;
+ garmin_data_p->state = 0;
+ garmin_data_p->count = 0;
+ usb_set_serial_port_data(port, garmin_data_p);
+
+ status = garmin_init_session(port);
+
+ return status;
+}
+
+
+static void garmin_shutdown (struct usb_serial *serial)
+{
+ struct usb_serial_port *port = serial->port[0];
+ struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
+
+ dbg("%s", __FUNCTION__);
+
+ usb_kill_urb (port->interrupt_in_urb);
+ del_timer_sync(&garmin_data_p->timer);
+ kfree (garmin_data_p);
+ usb_set_serial_port_data(port, NULL);
+}
+
+
+
+
+
+
+
+/* All of the device info needed */
+static struct usb_serial_device_type garmin_device = {
+ .owner = THIS_MODULE,
+ .name = "Garmin GPS usb/tty",
+ .short_name = "garmin_gps",
+ .id_table = id_table,
+ .num_interrupt_in = 1,
+ .num_bulk_in = 1,
+ .num_bulk_out = 1,
+ .num_ports = 1,
+ .open = garmin_open,
+ .close = garmin_close,
+ .throttle = garmin_throttle,
+ .unthrottle = garmin_unthrottle,
+ .attach = garmin_attach,
+ .shutdown = garmin_shutdown,
+ .write = garmin_write,
+ .write_room = garmin_write_room,
+ .chars_in_buffer = garmin_chars_in_buffer,
+ .write_bulk_callback = garmin_write_bulk_callback,
+ .read_bulk_callback = garmin_read_bulk_callback,
+ .read_int_callback = garmin_read_int_callback,
+};
+
+
+static int __init garmin_init (void)
+{
+ int retval;
+
+ retval = usb_serial_register(&garmin_device);
+ if (retval)
+ goto failed_garmin_register;
+ retval = usb_register(&garmin_driver);
+ if (retval)
+ goto failed_usb_register;
+ info(DRIVER_DESC " " DRIVER_VERSION);
+
+ return 0;
+failed_usb_register:
+ usb_serial_deregister(&garmin_device);
+failed_garmin_register:
+ return retval;
+}
+
+
+static void __exit garmin_exit (void)
+{
+ usb_deregister (&garmin_driver);
+ usb_serial_deregister (&garmin_device);
+}
+
+
+
+
+module_init(garmin_init);
+module_exit(garmin_exit);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+module_param(initial_mode, int, S_IRUGO);
+MODULE_PARM_DESC(initial_mode, "Initial mode");
+