![Burman Yan](/assets/img/avatar_default.png)
Replace kmalloc+memset with kzalloc Signed-off-by: Yan Burman <yan_952@hotmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1631 lines
42 KiB
C
1631 lines
42 KiB
C
/*
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* Garmin GPS driver
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*
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* Copyright (C) 2006 Hermann Kneissel herkne@users.sourceforge.net
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*
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* The latest version of the driver can be found at
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* http://sourceforge.net/projects/garmin-gps/
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*
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* This driver has been derived from v2.1 of the visor driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/version.h>
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/* the mode to be set when the port ist opened */
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static int initial_mode = 1;
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/* debug flag */
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static int debug = 0;
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#define GARMIN_VENDOR_ID 0x091E
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/*
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* Version Information
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*/
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#define VERSION_MAJOR 0
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#define VERSION_MINOR 28
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#define _STR(s) #s
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#define _DRIVER_VERSION(a,b) "v" _STR(a) "." _STR(b)
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#define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR)
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#define DRIVER_AUTHOR "hermann kneissel"
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#define DRIVER_DESC "garmin gps driver"
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/* error codes returned by the driver */
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#define EINVPKT 1000 /* invalid packet structure */
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// size of the header of a packet using the usb protocol
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#define GARMIN_PKTHDR_LENGTH 12
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// max. possible size of a packet using the serial protocol
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#define MAX_SERIAL_PKT_SIZ (3+255+3)
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// max. possible size of a packet with worst case stuffing
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#define MAX_SERIAL_PKT_SIZ_STUFFED MAX_SERIAL_PKT_SIZ+256
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// size of a buffer able to hold a complete (no stuffing) packet
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// (the document protocol does not contain packets with a larger
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// size, but in theory a packet may be 64k+12 bytes - if in
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// later protocol versions larger packet sizes occur, this value
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// should be increased accordingly, so the input buffer is always
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// large enough the store a complete packet inclusive header)
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#define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ)
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// size of a buffer able to hold a complete (incl. stuffing) packet
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#define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED)
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// where to place the packet id of a serial packet, so we can
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// prepend the usb-packet header without the need to move the
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// packets data
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#define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2)
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// max. size of incoming private packets (header+1 param)
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#define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4)
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#define GARMIN_LAYERID_TRANSPORT 0
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#define GARMIN_LAYERID_APPL 20
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// our own layer-id to use for some control mechanisms
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#define GARMIN_LAYERID_PRIVATE 0x01106E4B
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#define GARMIN_PKTID_PVT_DATA 51
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#define GARMIN_PKTID_L001_COMMAND_DATA 10
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#define CMND_ABORT_TRANSFER 0
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// packet ids used in private layer
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#define PRIV_PKTID_SET_DEBUG 1
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#define PRIV_PKTID_SET_MODE 2
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#define PRIV_PKTID_INFO_REQ 3
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#define PRIV_PKTID_INFO_RESP 4
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#define PRIV_PKTID_RESET_REQ 5
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#define PRIV_PKTID_SET_DEF_MODE 6
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#define ETX 0x03
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#define DLE 0x10
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#define ACK 0x06
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#define NAK 0x15
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/* structure used to queue incoming packets */
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struct garmin_packet {
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struct list_head list;
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int seq;
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int size; // the real size of the data array, always > 0
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__u8 data[1];
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};
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/* structure used to keep the current state of the driver */
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struct garmin_data {
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__u8 state;
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__u16 flags;
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__u8 mode;
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__u8 ignorePkts;
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__u8 count;
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__u8 pkt_id;
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__u32 serial_num;
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struct timer_list timer;
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struct usb_serial_port *port;
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int seq_counter;
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int insize;
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int outsize;
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__u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */
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__u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
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__u8 privpkt[4*6];
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spinlock_t lock;
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struct list_head pktlist;
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};
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#define STATE_NEW 0
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#define STATE_INITIAL_DELAY 1
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#define STATE_TIMEOUT 2
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#define STATE_SESSION_REQ1 3
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#define STATE_SESSION_REQ2 4
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#define STATE_ACTIVE 5
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#define STATE_RESET 8
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#define STATE_DISCONNECTED 9
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#define STATE_WAIT_TTY_ACK 10
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#define STATE_GSP_WAIT_DATA 11
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#define MODE_NATIVE 0
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#define MODE_GARMIN_SERIAL 1
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// Flags used in garmin_data.flags:
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#define FLAGS_SESSION_REPLY_MASK 0x00C0
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#define FLAGS_SESSION_REPLY1_SEEN 0x0080
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#define FLAGS_SESSION_REPLY2_SEEN 0x0040
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#define FLAGS_BULK_IN_ACTIVE 0x0020
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#define FLAGS_BULK_IN_RESTART 0x0010
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#define FLAGS_THROTTLED 0x0008
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#define CLEAR_HALT_REQUIRED 0x0001
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#define FLAGS_QUEUING 0x0100
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#define FLAGS_APP_RESP_SEEN 0x0200
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#define FLAGS_APP_REQ_SEEN 0x0400
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#define FLAGS_DROP_DATA 0x0800
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#define FLAGS_GSP_SKIP 0x1000
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#define FLAGS_GSP_DLESEEN 0x2000
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/* function prototypes */
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static void gsp_next_packet(struct garmin_data * garmin_data_p);
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static int garmin_write_bulk(struct usb_serial_port *port,
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const unsigned char *buf, int count);
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/* some special packets to be send or received */
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static unsigned char const GARMIN_START_SESSION_REQ[]
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= { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 };
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static unsigned char const GARMIN_START_SESSION_REQ2[]
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= { 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
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static unsigned char const GARMIN_START_SESSION_REPLY[]
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= { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 };
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static unsigned char const GARMIN_SESSION_ACTIVE_REPLY[]
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= { 0, 0, 0, 0, 17, 0, 0, 0, 4, 0, 0, 0, 0, 16, 0, 0 };
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static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
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= { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
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static unsigned char const GARMIN_APP_LAYER_REPLY[]
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= { 0x14, 0, 0, 0 };
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static unsigned char const GARMIN_START_PVT_REQ[]
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= { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 };
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static unsigned char const GARMIN_STOP_PVT_REQ[]
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= { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 };
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static unsigned char const GARMIN_STOP_TRANSFER_REQ[]
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= { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 };
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static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[]
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= { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 };
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static unsigned char const PRIVATE_REQ[]
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= { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 };
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static struct usb_device_id id_table [] = {
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/* the same device id seems to be used by all usb enabled gps devices */
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{ USB_DEVICE(GARMIN_VENDOR_ID, 3 ) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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static struct usb_driver garmin_driver = {
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.name = "garmin_gps",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static inline int noResponseFromAppLayer(struct garmin_data * garmin_data_p)
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{
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return ((garmin_data_p->flags
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& (FLAGS_APP_REQ_SEEN|FLAGS_APP_RESP_SEEN))
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== FLAGS_APP_REQ_SEEN);
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}
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static inline int getLayerId(const __u8 *usbPacket)
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{
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return __le32_to_cpup((__le32 *)(usbPacket));
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}
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static inline int getPacketId(const __u8 *usbPacket)
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{
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return __le32_to_cpup((__le32 *)(usbPacket+4));
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}
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static inline int getDataLength(const __u8 *usbPacket)
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{
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return __le32_to_cpup((__le32 *)(usbPacket+8));
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}
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/*
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* check if the usb-packet in buf contains an abort-transfer command.
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* (if yes, all queued data will be dropped)
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*/
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static inline int isAbortTrfCmnd(const unsigned char *buf)
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{
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if (0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
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sizeof(GARMIN_STOP_TRANSFER_REQ)) ||
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0 == memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
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sizeof(GARMIN_STOP_TRANSFER_REQ_V2)))
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return 1;
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else
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return 0;
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}
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static void send_to_tty(struct usb_serial_port *port,
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char *data, unsigned int actual_length)
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{
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struct tty_struct *tty = port->tty;
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if (tty && actual_length) {
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usb_serial_debug_data(debug, &port->dev,
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__FUNCTION__, actual_length, data);
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tty_buffer_request_room(tty, actual_length);
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tty_insert_flip_string(tty, data, actual_length);
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tty_flip_buffer_push(tty);
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}
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}
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/******************************************************************************
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* packet queue handling
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******************************************************************************/
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/*
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* queue a received (usb-)packet for later processing
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*/
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static int pkt_add(struct garmin_data * garmin_data_p,
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unsigned char *data, unsigned int data_length)
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{
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int state = 0;
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int result = 0;
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unsigned long flags;
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struct garmin_packet *pkt;
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/* process only packets containg data ... */
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if (data_length) {
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pkt = kmalloc(sizeof(struct garmin_packet)+data_length,
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GFP_ATOMIC);
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if (pkt == NULL) {
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dev_err(&garmin_data_p->port->dev, "out of memory\n");
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return 0;
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}
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pkt->size = data_length;
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memcpy(pkt->data, data, data_length);
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spin_lock_irqsave(&garmin_data_p->lock, flags);
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garmin_data_p->flags |= FLAGS_QUEUING;
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result = list_empty(&garmin_data_p->pktlist);
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pkt->seq = garmin_data_p->seq_counter++;
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list_add_tail(&pkt->list, &garmin_data_p->pktlist);
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state = garmin_data_p->state;
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spin_unlock_irqrestore(&garmin_data_p->lock, flags);
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/* in serial mode, if someone is waiting for data from
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the device, iconvert and send the next packet to tty. */
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if (result && (state == STATE_GSP_WAIT_DATA)) {
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gsp_next_packet(garmin_data_p);
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}
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}
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return result;
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}
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/* get the next pending packet */
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static struct garmin_packet *pkt_pop(struct garmin_data * garmin_data_p)
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{
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unsigned long flags;
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struct garmin_packet *result = NULL;
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spin_lock_irqsave(&garmin_data_p->lock, flags);
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if (!list_empty(&garmin_data_p->pktlist)) {
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result = (struct garmin_packet *)garmin_data_p->pktlist.next;
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list_del(&result->list);
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}
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spin_unlock_irqrestore(&garmin_data_p->lock, flags);
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return result;
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}
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/* free up all queued data */
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static void pkt_clear(struct garmin_data * garmin_data_p)
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{
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unsigned long flags;
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struct garmin_packet *result = NULL;
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dbg("%s", __FUNCTION__);
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spin_lock_irqsave(&garmin_data_p->lock, flags);
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while (!list_empty(&garmin_data_p->pktlist)) {
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result = (struct garmin_packet *)garmin_data_p->pktlist.next;
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list_del(&result->list);
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kfree(result);
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}
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spin_unlock_irqrestore(&garmin_data_p->lock, flags);
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}
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/******************************************************************************
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* garmin serial protocol handling handling
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******************************************************************************/
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/* send an ack packet back to the tty */
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static int gsp_send_ack(struct garmin_data * garmin_data_p, __u8 pkt_id)
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{
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__u8 pkt[10];
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__u8 cksum = 0;
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__u8 *ptr = pkt;
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unsigned l = 0;
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dbg("%s - pkt-id: 0x%X.", __FUNCTION__, 0xFF & pkt_id);
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*ptr++ = DLE;
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*ptr++ = ACK;
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cksum += ACK;
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*ptr++ = 2;
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cksum += 2;
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*ptr++ = pkt_id;
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cksum += pkt_id;
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if (pkt_id == DLE) {
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*ptr++ = DLE;
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}
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*ptr++ = 0;
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*ptr++ = 0xFF & (-cksum);
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*ptr++ = DLE;
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*ptr++ = ETX;
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l = ptr-pkt;
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send_to_tty(garmin_data_p->port, pkt, l);
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return 0;
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}
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/*
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* called for a complete packet received from tty layer
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*
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* the complete packet (pkzid ... cksum) is in garmin_data_p->inbuf starting
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* at GSP_INITIAL_OFFSET.
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*
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* count - number of bytes in the input buffer including space reserved for
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* the usb header: GSP_INITIAL_OFFSET + number of bytes in packet
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* (including pkt-id, data-length a. cksum)
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*/
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static int gsp_rec_packet(struct garmin_data * garmin_data_p, int count)
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{
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const __u8* recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET;
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__le32 *usbdata = (__le32 *) garmin_data_p->inbuffer;
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int cksum = 0;
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int n = 0;
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int pktid = recpkt[0];
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int size = recpkt[1];
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usb_serial_debug_data(debug, &garmin_data_p->port->dev,
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__FUNCTION__, count-GSP_INITIAL_OFFSET, recpkt);
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if (size != (count-GSP_INITIAL_OFFSET-3)) {
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dbg("%s - invalid size, expected %d bytes, got %d",
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__FUNCTION__, size, (count-GSP_INITIAL_OFFSET-3));
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return -EINVPKT;
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}
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cksum += *recpkt++;
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cksum += *recpkt++;
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// sanity check, remove after test ...
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if ((__u8*)&(usbdata[3]) != recpkt) {
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dbg("%s - ptr mismatch %p - %p",
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__FUNCTION__, &(usbdata[4]), recpkt);
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return -EINVPKT;
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}
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while (n < size) {
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cksum += *recpkt++;
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n++;
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}
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if ((0xff & (cksum + *recpkt)) != 0) {
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dbg("%s - invalid checksum, expected %02x, got %02x",
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__FUNCTION__, 0xff & -cksum, 0xff & *recpkt);
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return -EINVPKT;
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}
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usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL);
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usbdata[1] = __cpu_to_le32(pktid);
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usbdata[2] = __cpu_to_le32(size);
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garmin_write_bulk (garmin_data_p->port, garmin_data_p->inbuffer,
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GARMIN_PKTHDR_LENGTH+size);
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/* if this was an abort-transfer command, flush all
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queued data. */
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if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
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garmin_data_p->flags |= FLAGS_DROP_DATA;
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pkt_clear(garmin_data_p);
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}
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return count;
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}
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/*
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* Called for data received from tty
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*
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* buf contains the data read, it may span more than one packet or even
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* incomplete packets
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*
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* input record should be a serial-record, but it may not be complete.
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* Copy it into our local buffer, until an etx is seen (or an error
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* occurs).
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* Once the record is complete, convert into a usb packet and send it
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* to the bulk pipe, send an ack back to the tty.
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*
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* If the input is an ack, just send the last queued packet to the
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* 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)
|
|
{
|
|
unsigned long flags;
|
|
int offs = 0;
|
|
int ack_or_nak_seen = 0;
|
|
int i = 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);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
if (ack_or_nak_seen) {
|
|
garmin_data_p->state = STATE_GSP_WAIT_DATA;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
if (ack_or_nak_seen) {
|
|
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)
|
|
{
|
|
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) {
|
|
/* 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)) {
|
|
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);
|
|
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)
|
|
{
|
|
unsigned long flags;
|
|
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);
|
|
|
|
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 status;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static int garmin_init_session(struct usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
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) {
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->ignorePkts++;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* 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;
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->ignorePkts++;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int garmin_open (struct usb_serial_port *port, struct file *filp)
|
|
{
|
|
unsigned long flags;
|
|
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;
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->mode = initial_mode;
|
|
garmin_data_p->count = 0;
|
|
garmin_data_p->flags = 0;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* 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)
|
|
{
|
|
unsigned long flags;
|
|
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);
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= CLEAR_HALT_REQUIRED;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
|
|
usb_serial_port_softint(port);
|
|
}
|
|
|
|
|
|
static int garmin_write_bulk (struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
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;
|
|
|
|
dbg("%s - port %d, state %d", __FUNCTION__, port->number,
|
|
garmin_data_p->state);
|
|
|
|
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) {
|
|
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)) {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= 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 */
|
|
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)
|
|
{
|
|
unsigned long flags;
|
|
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:
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_APP_REQ_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
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;
|
|
}
|
|
}
|
|
|
|
garmin_data_p->ignorePkts = 0;
|
|
|
|
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)
|
|
{
|
|
unsigned long flags;
|
|
|
|
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))) {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_APP_RESP_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
|
|
/* 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 (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)
|
|
{
|
|
unsigned long flags;
|
|
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);
|
|
|
|
if (urb->actual_length == 0 &&
|
|
0 != (garmin_data_p->flags & FLAGS_BULK_IN_RESTART)) {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
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);
|
|
} else if (urb->actual_length > 0) {
|
|
/* Continue trying to read until nothing more is received */
|
|
if (0 == (garmin_data_p->flags & FLAGS_THROTTLED)) {
|
|
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);
|
|
}
|
|
} else {
|
|
dbg("%s - end of bulk data", __FUNCTION__);
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
static void garmin_read_int_callback (struct urb *urb)
|
|
{
|
|
unsigned long flags;
|
|
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__);
|
|
|
|
if (0 == (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
|
|
|
|
/* 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_ATOMIC);
|
|
if (status) {
|
|
dev_err(&port->dev,
|
|
"%s - failed submitting read urb, error %d\n",
|
|
__FUNCTION__, status);
|
|
} else {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
|
|
/* do not send this packet to the user */
|
|
garmin_data_p->ignorePkts = 1;
|
|
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))
|
|
&& 0 == memcmp(data, GARMIN_START_SESSION_REPLY,
|
|
sizeof(GARMIN_START_SESSION_REPLY))) {
|
|
|
|
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));
|
|
|
|
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);
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->ignorePkts--;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
} 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)
|
|
{
|
|
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 usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
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 */
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
|
|
|
|
static void garmin_unthrottle (struct usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
struct garmin_data * garmin_data_p = usb_get_serial_port_data(port);
|
|
int status;
|
|
|
|
dbg("%s - port %d", __FUNCTION__, port->number);
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_THROTTLED;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* 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 (0 != (garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE)) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* 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 = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
|
|
if (garmin_data_p == NULL) {
|
|
dev_err(&port->dev, "%s - Out of memory\n", __FUNCTION__);
|
|
return -ENOMEM;
|
|
}
|
|
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_driver garmin_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "garmin_gps",
|
|
},
|
|
.description = "Garmin GPS usb/tty",
|
|
.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");
|
|
|