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linux/drivers/usb/serial/garmin_gps.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1542 lines
39 KiB
C
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/*
* Garmin GPS driver
*
* Copyright (C) 2004 Hermann Kneissel herkne@users.sourceforge.net
*
* 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 == NULL) {
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 = 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;
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
*/
static 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 = NULL;
while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
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 != NULL && 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 != NULL) {
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 = NULL;
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");
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