![Mathieu OTHACEHE](/assets/img/avatar_default.png)
Remove unneeded variables when "0" can be returned. Generated by: scripts/coccinelle/misc/returnvar.cocci Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org>
1456 lines
38 KiB
C
1456 lines
38 KiB
C
/*
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* Garmin GPS driver
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*
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* Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de
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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/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 <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.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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#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 36
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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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/* the real size of the data array, always > 0 */
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int size;
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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 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 APP_REQ_SEEN 0x0004
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#define APP_RESP_SEEN 0x0002
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#define CLEAR_HALT_REQUIRED 0x0001
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#define FLAGS_QUEUING 0x0100
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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 int 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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int dismiss_ack);
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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_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_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 const struct usb_device_id id_table[] = {
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/* the same device id seems to be used by all
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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 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 (memcmp(buf, GARMIN_STOP_TRANSFER_REQ,
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sizeof(GARMIN_STOP_TRANSFER_REQ)) == 0 ||
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memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2,
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sizeof(GARMIN_STOP_TRANSFER_REQ_V2)) == 0)
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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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if (actual_length) {
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usb_serial_debug_data(&port->dev, __func__, actual_length, data);
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tty_insert_flip_string(&port->port, data, actual_length);
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tty_flip_buffer_push(&port->port);
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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 containing 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)
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return 0;
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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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dev_dbg(&garmin_data_p->port->dev,
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"%s - added: pkt: %d - %d bytes\n", __func__,
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pkt->seq, data_length);
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/* in serial mode, if someone is waiting for data from
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the device, convert 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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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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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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dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__,
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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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*ptr++ = 0;
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*ptr++ = (-cksum) & 0xFF;
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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 (pktid ... 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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struct device *dev = &garmin_data_p->port->dev;
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unsigned long flags;
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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(&garmin_data_p->port->dev, __func__,
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count-GSP_INITIAL_OFFSET, recpkt);
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if (size != (count-GSP_INITIAL_OFFSET-3)) {
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dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n",
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__func__, 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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dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__,
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&(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 (((cksum + *recpkt) & 0xff) != 0) {
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dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n",
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__func__, -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, 0);
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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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spin_lock_irqsave(&garmin_data_p->lock, flags);
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garmin_data_p->flags |= FLAGS_DROP_DATA;
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spin_unlock_irqrestore(&garmin_data_p->lock, flags);
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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.
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*
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* if the input is an abort command, drop all queued data.
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*/
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static int gsp_receive(struct garmin_data *garmin_data_p,
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const unsigned char *buf, int count)
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{
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struct device *dev = &garmin_data_p->port->dev;
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unsigned long flags;
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int offs = 0;
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int ack_or_nak_seen = 0;
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__u8 *dest;
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int size;
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/* dleSeen: set if last byte read was a DLE */
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int dleSeen;
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/* skip: if set, skip incoming data until possible start of
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* new packet
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*/
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int skip;
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__u8 data;
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spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
dest = garmin_data_p->inbuffer;
|
|
size = garmin_data_p->insize;
|
|
dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN;
|
|
skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n",
|
|
__func__, dleSeen, skip, size, count); */
|
|
|
|
if (size == 0)
|
|
size = GSP_INITIAL_OFFSET;
|
|
|
|
while (offs < count) {
|
|
|
|
data = *(buf+offs);
|
|
offs++;
|
|
|
|
if (data == DLE) {
|
|
if (skip) { /* start of a new pkt */
|
|
skip = 0;
|
|
size = GSP_INITIAL_OFFSET;
|
|
dleSeen = 1;
|
|
} else if (dleSeen) {
|
|
dest[size++] = data;
|
|
dleSeen = 0;
|
|
} else {
|
|
dleSeen = 1;
|
|
}
|
|
} else if (data == ETX) {
|
|
if (dleSeen) {
|
|
/* packet complete */
|
|
|
|
data = dest[GSP_INITIAL_OFFSET];
|
|
|
|
if (data == ACK) {
|
|
ack_or_nak_seen = ACK;
|
|
dev_dbg(dev, "ACK packet complete.\n");
|
|
} else if (data == NAK) {
|
|
ack_or_nak_seen = NAK;
|
|
dev_dbg(dev, "NAK packet complete.\n");
|
|
} else {
|
|
dev_dbg(dev, "packet complete - id=0x%X.\n",
|
|
data);
|
|
gsp_rec_packet(garmin_data_p, size);
|
|
}
|
|
|
|
skip = 1;
|
|
size = GSP_INITIAL_OFFSET;
|
|
dleSeen = 0;
|
|
} else {
|
|
dest[size++] = data;
|
|
}
|
|
} else if (!skip) {
|
|
|
|
if (dleSeen) {
|
|
size = GSP_INITIAL_OFFSET;
|
|
dleSeen = 0;
|
|
}
|
|
|
|
dest[size++] = data;
|
|
}
|
|
|
|
if (size >= GPS_IN_BUFSIZ) {
|
|
dev_dbg(dev, "%s - packet too large.\n", __func__);
|
|
skip = 1;
|
|
size = GSP_INITIAL_OFFSET;
|
|
dleSeen = 0;
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
|
|
garmin_data_p->insize = size;
|
|
|
|
/* copy flags back to structure */
|
|
if (skip)
|
|
garmin_data_p->flags |= FLAGS_GSP_SKIP;
|
|
else
|
|
garmin_data_p->flags &= ~FLAGS_GSP_SKIP;
|
|
|
|
if (dleSeen)
|
|
garmin_data_p->flags |= FLAGS_GSP_DLESEEN;
|
|
else
|
|
garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
|
|
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
if (ack_or_nak_seen) {
|
|
if (gsp_next_packet(garmin_data_p) > 0)
|
|
garmin_data_p->state = STATE_ACTIVE;
|
|
else
|
|
garmin_data_p->state = STATE_GSP_WAIT_DATA;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Sends a usb packet to the tty
|
|
*
|
|
* Assumes, that all packages and at an usb-packet boundary.
|
|
*
|
|
* return <0 on error, 0 if packet is incomplete or > 0 if packet was sent
|
|
*/
|
|
static int gsp_send(struct garmin_data *garmin_data_p,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct device *dev = &garmin_data_p->port->dev;
|
|
const unsigned char *src;
|
|
unsigned char *dst;
|
|
int pktid = 0;
|
|
int datalen = 0;
|
|
int cksum = 0;
|
|
int i = 0;
|
|
int k;
|
|
|
|
dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__,
|
|
garmin_data_p->state, count);
|
|
|
|
k = garmin_data_p->outsize;
|
|
if ((k+count) > GPS_OUT_BUFSIZ) {
|
|
dev_dbg(dev, "packet too large\n");
|
|
garmin_data_p->outsize = 0;
|
|
return -4;
|
|
}
|
|
|
|
memcpy(garmin_data_p->outbuffer+k, buf, count);
|
|
k += count;
|
|
garmin_data_p->outsize = k;
|
|
|
|
if (k >= GARMIN_PKTHDR_LENGTH) {
|
|
pktid = getPacketId(garmin_data_p->outbuffer);
|
|
datalen = getDataLength(garmin_data_p->outbuffer);
|
|
i = GARMIN_PKTHDR_LENGTH + datalen;
|
|
if (k < i)
|
|
return 0;
|
|
} else {
|
|
return 0;
|
|
}
|
|
|
|
dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i);
|
|
|
|
/* garmin_data_p->outbuffer now contains a complete packet */
|
|
|
|
usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k,
|
|
garmin_data_p->outbuffer);
|
|
|
|
garmin_data_p->outsize = 0;
|
|
|
|
if (getLayerId(garmin_data_p->outbuffer) != GARMIN_LAYERID_APPL) {
|
|
dev_dbg(dev, "not an application packet (%d)\n",
|
|
getLayerId(garmin_data_p->outbuffer));
|
|
return -1;
|
|
}
|
|
|
|
if (pktid > 255) {
|
|
dev_dbg(dev, "packet-id %d too large\n", pktid);
|
|
return -2;
|
|
}
|
|
|
|
if (datalen > 255) {
|
|
dev_dbg(dev, "packet-size %d too large\n", datalen);
|
|
return -3;
|
|
}
|
|
|
|
/* the serial protocol should be able to handle this packet */
|
|
|
|
k = 0;
|
|
src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
|
|
for (i = 0; i < datalen; i++) {
|
|
if (*src++ == DLE)
|
|
k++;
|
|
}
|
|
|
|
src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH;
|
|
if (k > (GARMIN_PKTHDR_LENGTH-2)) {
|
|
/* can't add stuffing DLEs in place, move data to end
|
|
of buffer ... */
|
|
dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen;
|
|
memcpy(dst, src, datalen);
|
|
src = dst;
|
|
}
|
|
|
|
dst = garmin_data_p->outbuffer;
|
|
|
|
*dst++ = DLE;
|
|
*dst++ = pktid;
|
|
cksum += pktid;
|
|
*dst++ = datalen;
|
|
cksum += datalen;
|
|
if (datalen == DLE)
|
|
*dst++ = DLE;
|
|
|
|
for (i = 0; i < datalen; i++) {
|
|
__u8 c = *src++;
|
|
*dst++ = c;
|
|
cksum += c;
|
|
if (c == DLE)
|
|
*dst++ = DLE;
|
|
}
|
|
|
|
cksum = -cksum & 0xFF;
|
|
*dst++ = cksum;
|
|
if (cksum == DLE)
|
|
*dst++ = DLE;
|
|
*dst++ = DLE;
|
|
*dst++ = ETX;
|
|
|
|
i = dst-garmin_data_p->outbuffer;
|
|
|
|
send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i);
|
|
|
|
garmin_data_p->pkt_id = pktid;
|
|
garmin_data_p->state = STATE_WAIT_TTY_ACK;
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process the next pending data packet - if there is one
|
|
*/
|
|
static int gsp_next_packet(struct garmin_data *garmin_data_p)
|
|
{
|
|
int result = 0;
|
|
struct garmin_packet *pkt = NULL;
|
|
|
|
while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
|
|
dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq);
|
|
result = gsp_send(garmin_data_p, pkt->data, pkt->size);
|
|
if (result > 0) {
|
|
kfree(pkt);
|
|
return result;
|
|
}
|
|
kfree(pkt);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
/******************************************************************************
|
|
* garmin native mode
|
|
******************************************************************************/
|
|
|
|
|
|
/*
|
|
* Called for data received from tty
|
|
*
|
|
* The input data is expected to be in garmin usb-packet format.
|
|
*
|
|
* buf contains the data read, it may span more than one packet
|
|
* or even incomplete packets
|
|
*/
|
|
static int nat_receive(struct garmin_data *garmin_data_p,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
unsigned long flags;
|
|
__u8 *dest;
|
|
int offs = 0;
|
|
int result = count;
|
|
int len;
|
|
|
|
while (offs < count) {
|
|
/* if buffer contains header, copy rest of data */
|
|
if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH)
|
|
len = GARMIN_PKTHDR_LENGTH
|
|
+getDataLength(garmin_data_p->inbuffer);
|
|
else
|
|
len = GARMIN_PKTHDR_LENGTH;
|
|
|
|
if (len >= GPS_IN_BUFSIZ) {
|
|
/* seems to be an invalid packet, ignore rest
|
|
of input */
|
|
dev_dbg(&garmin_data_p->port->dev,
|
|
"%s - packet size too large: %d\n",
|
|
__func__, len);
|
|
garmin_data_p->insize = 0;
|
|
count = 0;
|
|
result = -EINVPKT;
|
|
} else {
|
|
len -= garmin_data_p->insize;
|
|
if (len > (count-offs))
|
|
len = (count-offs);
|
|
if (len > 0) {
|
|
dest = garmin_data_p->inbuffer
|
|
+ garmin_data_p->insize;
|
|
memcpy(dest, buf+offs, len);
|
|
garmin_data_p->insize += len;
|
|
offs += len;
|
|
}
|
|
}
|
|
|
|
/* do we have a complete packet ? */
|
|
if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) {
|
|
len = GARMIN_PKTHDR_LENGTH+
|
|
getDataLength(garmin_data_p->inbuffer);
|
|
if (garmin_data_p->insize >= len) {
|
|
garmin_write_bulk(garmin_data_p->port,
|
|
garmin_data_p->inbuffer,
|
|
len, 0);
|
|
garmin_data_p->insize = 0;
|
|
|
|
/* if this was an abort-transfer command,
|
|
flush all queued data. */
|
|
if (isAbortTrfCmnd(garmin_data_p->inbuffer)) {
|
|
spin_lock_irqsave(&garmin_data_p->lock,
|
|
flags);
|
|
garmin_data_p->flags |= FLAGS_DROP_DATA;
|
|
spin_unlock_irqrestore(
|
|
&garmin_data_p->lock, flags);
|
|
pkt_clear(garmin_data_p);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
* private packets
|
|
******************************************************************************/
|
|
|
|
static void priv_status_resp(struct usb_serial_port *port)
|
|
{
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
__le32 *pkt = (__le32 *)garmin_data_p->privpkt;
|
|
|
|
pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE);
|
|
pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP);
|
|
pkt[2] = __cpu_to_le32(12);
|
|
pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR);
|
|
pkt[4] = __cpu_to_le32(garmin_data_p->mode);
|
|
pkt[5] = __cpu_to_le32(garmin_data_p->serial_num);
|
|
|
|
send_to_tty(port, (__u8 *)pkt, 6 * 4);
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
* Garmin specific driver functions
|
|
******************************************************************************/
|
|
|
|
static int process_resetdev_request(struct usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
int status;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED);
|
|
garmin_data_p->state = STATE_RESET;
|
|
garmin_data_p->serial_num = 0;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__);
|
|
status = usb_reset_device(port->serial->dev);
|
|
if (status)
|
|
dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n",
|
|
__func__, status);
|
|
return status;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* clear all cached data
|
|
*/
|
|
static int garmin_clear(struct garmin_data *garmin_data_p)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* flush all queued data */
|
|
pkt_clear(garmin_data_p);
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->insize = 0;
|
|
garmin_data_p->outsize = 0;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int garmin_init_session(struct usb_serial_port *port)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
int status = 0;
|
|
int i = 0;
|
|
|
|
if (status == 0) {
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
|
|
dev_dbg(&serial->dev->dev, "%s - adding interrupt input\n", __func__);
|
|
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",
|
|
__func__, status);
|
|
}
|
|
|
|
/*
|
|
* using the initialization method from gpsbabel. See comments in
|
|
* gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
|
|
*/
|
|
if (status == 0) {
|
|
dev_dbg(&serial->dev->dev, "%s - starting session ...\n", __func__);
|
|
garmin_data_p->state = STATE_ACTIVE;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
status = garmin_write_bulk(port,
|
|
GARMIN_START_SESSION_REQ,
|
|
sizeof(GARMIN_START_SESSION_REQ), 0);
|
|
|
|
if (status < 0)
|
|
break;
|
|
}
|
|
|
|
if (status > 0)
|
|
status = 0;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
|
|
static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
unsigned long flags;
|
|
int status = 0;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->mode = initial_mode;
|
|
garmin_data_p->count = 0;
|
|
garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* shutdown any bulk reads that might be going on */
|
|
usb_kill_urb(port->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 garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
|
|
dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n",
|
|
__func__, garmin_data_p->mode, garmin_data_p->state,
|
|
garmin_data_p->flags);
|
|
|
|
garmin_clear(garmin_data_p);
|
|
|
|
/* shutdown our urbs */
|
|
usb_kill_urb(port->read_urb);
|
|
usb_kill_urb(port->write_urb);
|
|
|
|
/* keep reset state so we know that we must start a new session */
|
|
if (garmin_data_p->state != STATE_RESET)
|
|
garmin_data_p->state = STATE_DISCONNECTED;
|
|
}
|
|
|
|
|
|
static void garmin_write_bulk_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
|
|
if (port) {
|
|
struct garmin_data *garmin_data_p =
|
|
usb_get_serial_port_data(port);
|
|
|
|
if (getLayerId(urb->transfer_buffer) == GARMIN_LAYERID_APPL) {
|
|
|
|
if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
|
|
gsp_send_ack(garmin_data_p,
|
|
((__u8 *)urb->transfer_buffer)[4]);
|
|
}
|
|
}
|
|
usb_serial_port_softint(port);
|
|
}
|
|
|
|
/* Ignore errors that resulted from garmin_write_bulk with
|
|
dismiss_ack = 1 */
|
|
|
|
/* free up the transfer buffer, as usb_free_urb() does not do this */
|
|
kfree(urb->transfer_buffer);
|
|
}
|
|
|
|
|
|
static int garmin_write_bulk(struct usb_serial_port *port,
|
|
const unsigned char *buf, int count,
|
|
int dismiss_ack)
|
|
{
|
|
unsigned long flags;
|
|
struct usb_serial *serial = port->serial;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
struct urb *urb;
|
|
unsigned char *buffer;
|
|
int status;
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_DROP_DATA;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
buffer = kmalloc(count, GFP_ATOMIC);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
urb = usb_alloc_urb(0, GFP_ATOMIC);
|
|
if (!urb) {
|
|
kfree(buffer);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memcpy(buffer, buf, count);
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, count, buffer);
|
|
|
|
usb_fill_bulk_urb(urb, serial->dev,
|
|
usb_sndbulkpipe(serial->dev,
|
|
port->bulk_out_endpointAddress),
|
|
buffer, count,
|
|
garmin_write_bulk_callback,
|
|
dismiss_ack ? NULL : port);
|
|
urb->transfer_flags |= URB_ZERO_PACKET;
|
|
|
|
if (getLayerId(buffer) == GARMIN_LAYERID_APPL) {
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= APP_REQ_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
|
|
pkt_clear(garmin_data_p);
|
|
garmin_data_p->state = STATE_GSP_WAIT_DATA;
|
|
}
|
|
}
|
|
|
|
/* send it down the pipe */
|
|
status = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (status) {
|
|
dev_err(&port->dev,
|
|
"%s - usb_submit_urb(write bulk) failed with status = %d\n",
|
|
__func__, status);
|
|
count = status;
|
|
}
|
|
|
|
/* we are done with this urb, so let the host driver
|
|
* really free it when it is finished with it */
|
|
usb_free_urb(urb);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct device *dev = &port->dev;
|
|
int pktid, pktsiz, len;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
__le32 *privpkt = (__le32 *)garmin_data_p->privpkt;
|
|
|
|
usb_serial_debug_data(dev, __func__, count, buf);
|
|
|
|
if (garmin_data_p->state == STATE_RESET)
|
|
return -EIO;
|
|
|
|
/* check for our private packets */
|
|
if (count >= GARMIN_PKTHDR_LENGTH) {
|
|
len = PRIVPKTSIZ;
|
|
if (count < len)
|
|
len = count;
|
|
|
|
memcpy(garmin_data_p->privpkt, buf, len);
|
|
|
|
pktsiz = getDataLength(garmin_data_p->privpkt);
|
|
pktid = getPacketId(garmin_data_p->privpkt);
|
|
|
|
if (count == (GARMIN_PKTHDR_LENGTH + pktsiz) &&
|
|
getLayerId(garmin_data_p->privpkt) ==
|
|
GARMIN_LAYERID_PRIVATE) {
|
|
|
|
dev_dbg(dev, "%s - processing private request %d\n",
|
|
__func__, pktid);
|
|
|
|
/* drop all unfinished transfers */
|
|
garmin_clear(garmin_data_p);
|
|
|
|
switch (pktid) {
|
|
case PRIV_PKTID_SET_MODE:
|
|
if (pktsiz != 4)
|
|
return -EINVPKT;
|
|
garmin_data_p->mode = __le32_to_cpu(privpkt[3]);
|
|
dev_dbg(dev, "%s - mode set to %d\n",
|
|
__func__, garmin_data_p->mode);
|
|
break;
|
|
|
|
case PRIV_PKTID_INFO_REQ:
|
|
priv_status_resp(port);
|
|
break;
|
|
|
|
case PRIV_PKTID_RESET_REQ:
|
|
process_resetdev_request(port);
|
|
break;
|
|
|
|
case PRIV_PKTID_SET_DEF_MODE:
|
|
if (pktsiz != 4)
|
|
return -EINVPKT;
|
|
initial_mode = __le32_to_cpu(privpkt[3]);
|
|
dev_dbg(dev, "%s - initial_mode set to %d\n",
|
|
__func__,
|
|
garmin_data_p->mode);
|
|
break;
|
|
}
|
|
return count;
|
|
}
|
|
}
|
|
|
|
if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
|
|
return gsp_receive(garmin_data_p, buf, count);
|
|
} else { /* MODE_NATIVE */
|
|
return nat_receive(garmin_data_p, buf, count);
|
|
}
|
|
}
|
|
|
|
|
|
static int garmin_write_room(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
/*
|
|
* Report back the bytes currently available in the output buffer.
|
|
*/
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
return GPS_OUT_BUFSIZ-garmin_data_p->outsize;
|
|
}
|
|
|
|
|
|
static void garmin_read_process(struct garmin_data *garmin_data_p,
|
|
unsigned char *data, unsigned data_length,
|
|
int bulk_data)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (garmin_data_p->flags & FLAGS_DROP_DATA) {
|
|
/* abort-transfer cmd is active */
|
|
dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__);
|
|
} else if (garmin_data_p->state != STATE_DISCONNECTED &&
|
|
garmin_data_p->state != STATE_RESET) {
|
|
|
|
/* if throttling is active or postprecessing is required
|
|
put the received data in the input queue, otherwise
|
|
send it directly to the tty port */
|
|
if (garmin_data_p->flags & FLAGS_QUEUING) {
|
|
pkt_add(garmin_data_p, data, data_length);
|
|
} else if (bulk_data ||
|
|
getLayerId(data) == GARMIN_LAYERID_APPL) {
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= APP_RESP_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
|
|
pkt_add(garmin_data_p, data, data_length);
|
|
} else {
|
|
send_to_tty(garmin_data_p->port, data,
|
|
data_length);
|
|
}
|
|
}
|
|
/* ignore system layer packets ... */
|
|
}
|
|
}
|
|
|
|
|
|
static void garmin_read_bulk_callback(struct urb *urb)
|
|
{
|
|
unsigned long flags;
|
|
struct usb_serial_port *port = urb->context;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
unsigned char *data = urb->transfer_buffer;
|
|
int status = urb->status;
|
|
int retval;
|
|
|
|
if (status) {
|
|
dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
|
|
|
|
garmin_read_process(garmin_data_p, data, urb->actual_length, 1);
|
|
|
|
if (urb->actual_length == 0 &&
|
|
(garmin_data_p->flags & FLAGS_BULK_IN_RESTART) != 0) {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
|
|
if (retval)
|
|
dev_err(&port->dev,
|
|
"%s - failed resubmitting read urb, error %d\n",
|
|
__func__, retval);
|
|
} else if (urb->actual_length > 0) {
|
|
/* Continue trying to read until nothing more is received */
|
|
if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
|
|
retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
|
|
if (retval)
|
|
dev_err(&port->dev,
|
|
"%s - failed resubmitting read urb, error %d\n",
|
|
__func__, retval);
|
|
}
|
|
} else {
|
|
dev_dbg(&port->dev, "%s - end of bulk data\n", __func__);
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
}
|
|
|
|
|
|
static void garmin_read_int_callback(struct urb *urb)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
struct usb_serial_port *port = urb->context;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
unsigned char *data = urb->transfer_buffer;
|
|
int status = urb->status;
|
|
|
|
switch (status) {
|
|
case 0:
|
|
/* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* this urb is terminated, clean up */
|
|
dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
|
|
__func__, status);
|
|
return;
|
|
default:
|
|
dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
|
|
urb->transfer_buffer);
|
|
|
|
if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) &&
|
|
memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY,
|
|
sizeof(GARMIN_BULK_IN_AVAIL_REPLY)) == 0) {
|
|
|
|
dev_dbg(&port->dev, "%s - bulk data available.\n", __func__);
|
|
|
|
if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) == 0) {
|
|
|
|
/* bulk data available */
|
|
retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
|
|
if (retval) {
|
|
dev_err(&port->dev,
|
|
"%s - failed submitting read urb, error %d\n",
|
|
__func__, retval);
|
|
} else {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock,
|
|
flags);
|
|
}
|
|
} else {
|
|
/* bulk-in transfer still active */
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_BULK_IN_RESTART;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
|
|
} else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY))
|
|
&& memcmp(data, GARMIN_START_SESSION_REPLY,
|
|
sizeof(GARMIN_START_SESSION_REPLY)) == 0) {
|
|
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
|
|
/* save the serial number */
|
|
garmin_data_p->serial_num = __le32_to_cpup(
|
|
(__le32 *)(data+GARMIN_PKTHDR_LENGTH));
|
|
|
|
dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n",
|
|
__func__, garmin_data_p->serial_num);
|
|
}
|
|
|
|
garmin_read_process(garmin_data_p, data, urb->actual_length, 0);
|
|
|
|
retval = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (retval)
|
|
dev_err(&urb->dev->dev,
|
|
"%s - Error %d submitting interrupt urb\n",
|
|
__func__, retval);
|
|
}
|
|
|
|
|
|
/*
|
|
* Sends the next queued packt to the tty port (garmin native mode only)
|
|
* and then sets a timer to call itself again until all queued data
|
|
* is sent.
|
|
*/
|
|
static int garmin_flush_queue(struct garmin_data *garmin_data_p)
|
|
{
|
|
unsigned long flags;
|
|
struct garmin_packet *pkt;
|
|
|
|
if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) {
|
|
pkt = pkt_pop(garmin_data_p);
|
|
if (pkt != NULL) {
|
|
send_to_tty(garmin_data_p->port, pkt->data, pkt->size);
|
|
kfree(pkt);
|
|
mod_timer(&garmin_data_p->timer, (1)+jiffies);
|
|
|
|
} else {
|
|
spin_lock_irqsave(&garmin_data_p->lock, flags);
|
|
garmin_data_p->flags &= ~FLAGS_QUEUING;
|
|
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void garmin_throttle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
|
|
/* set flag, data received will be put into a queue
|
|
for later processing */
|
|
spin_lock_irq(&garmin_data_p->lock);
|
|
garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED;
|
|
spin_unlock_irq(&garmin_data_p->lock);
|
|
}
|
|
|
|
|
|
static void garmin_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
int status;
|
|
|
|
spin_lock_irq(&garmin_data_p->lock);
|
|
garmin_data_p->flags &= ~FLAGS_THROTTLED;
|
|
spin_unlock_irq(&garmin_data_p->lock);
|
|
|
|
/* in native mode send queued data to tty, in
|
|
serial mode nothing needs to be done here */
|
|
if (garmin_data_p->mode == MODE_NATIVE)
|
|
garmin_flush_queue(garmin_data_p);
|
|
|
|
if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) != 0) {
|
|
status = usb_submit_urb(port->read_urb, GFP_KERNEL);
|
|
if (status)
|
|
dev_err(&port->dev,
|
|
"%s - failed resubmitting read urb, error %d\n",
|
|
__func__, status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The timer is currently only used to send queued packets to
|
|
* the tty in cases where the protocol provides no own handshaking
|
|
* to initiate the transfer.
|
|
*/
|
|
static void timeout_handler(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_port_probe(struct usb_serial_port *port)
|
|
{
|
|
int status;
|
|
struct garmin_data *garmin_data_p;
|
|
|
|
garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL);
|
|
if (!garmin_data_p)
|
|
return -ENOMEM;
|
|
|
|
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->flags = 0;
|
|
garmin_data_p->count = 0;
|
|
usb_set_serial_port_data(port, garmin_data_p);
|
|
|
|
status = garmin_init_session(port);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
static int garmin_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
|
|
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
del_timer_sync(&garmin_data_p->timer);
|
|
kfree(garmin_data_p);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* All of the device info needed */
|
|
static struct usb_serial_driver garmin_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "garmin_gps",
|
|
},
|
|
.description = "Garmin GPS usb/tty",
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.open = garmin_open,
|
|
.close = garmin_close,
|
|
.throttle = garmin_throttle,
|
|
.unthrottle = garmin_unthrottle,
|
|
.port_probe = garmin_port_probe,
|
|
.port_remove = garmin_port_remove,
|
|
.write = garmin_write,
|
|
.write_room = garmin_write_room,
|
|
.write_bulk_callback = garmin_write_bulk_callback,
|
|
.read_bulk_callback = garmin_read_bulk_callback,
|
|
.read_int_callback = garmin_read_int_callback,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&garmin_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(initial_mode, int, S_IRUGO);
|
|
MODULE_PARM_DESC(initial_mode, "Initial mode");
|