LXR linux/drivers/usb/serial/navman.c

   1/*
   2 * Navman Serial USB driver
   3 *
   4 * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de>
   5 *
   6 *      This program is free software; you can redistribute it and/or
   7 *      modify it under the terms of the GNU General Public License
   8 *      version 2 as published by the Free Software Foundation.
   9 *
  10 * TODO:
  11 *      Add termios method that uses copy_hw but also kills all echo
  12 *      flags as the navman is rx only so cannot echo.
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/init.h>
  17#include <linux/tty.h>
  18#include <linux/tty_flip.h>
  19#include <linux/module.h>
  20#include <linux/usb.h>
  21#include <linux/usb/serial.h>
  22
  23static int debug;
  24
  25static struct usb_device_id id_table [] = {
  26        { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  27        { },
  28};
  29MODULE_DEVICE_TABLE(usb, id_table);
  30
  31static struct usb_driver navman_driver = {
  32        .name =         "navman",
  33        .probe =        usb_serial_probe,
  34        .disconnect =   usb_serial_disconnect,
  35        .id_table =     id_table,
  36        .no_dynamic_id =        1,
  37};
  38
  39static void navman_read_int_callback(struct urb *urb)
  40{
  41        struct usb_serial_port *port = urb->context;
  42        unsigned char *data = urb->transfer_buffer;
  43        struct tty_struct *tty;
  44        int status = urb->status;
  45        int result;
  46
  47        switch (status) {
  48        case 0:
  49                /* success */
  50                break;
  51        case -ECONNRESET:
  52        case -ENOENT:
  53        case -ESHUTDOWN:
  54                /* this urb is terminated, clean up */
  55                dbg("%s - urb shutting down with status: %d",
  56                    __func__, status);
  57                return;
  58        default:
  59                dbg("%s - nonzero urb status received: %d",
  60                    __func__, status);
  61                goto exit;
  62        }
  63
  64        usb_serial_debug_data(debug, &port->dev, __func__,
  65                              urb->actual_length, data);
  66
  67        tty = tty_port_tty_get(&port->port);
  68        if (tty && urb->actual_length) {
  69                tty_buffer_request_room(tty, urb->actual_length);
  70                tty_insert_flip_string(tty, data, urb->actual_length);
  71                tty_flip_buffer_push(tty);
  72        }
  73        tty_kref_put(tty);
  74
  75exit:
  76        result = usb_submit_urb(urb, GFP_ATOMIC);
  77        if (result)
  78                dev_err(&urb->dev->dev,
  79                        "%s - Error %d submitting interrupt urb\n",
  80                        __func__, result);
  81}
  82
  83static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  84{
  85        int result = 0;
  86
  87        dbg("%s - port %d", __func__, port->number);
  88
  89        if (port->interrupt_in_urb) {
  90                dbg("%s - adding interrupt input for treo", __func__);
  91                result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  92                if (result)
  93                        dev_err(&port->dev,
  94                                "%s - failed submitting interrupt urb, error %d\n",
  95                                __func__, result);
  96        }
  97        return result;
  98}
  99
 100static void navman_close(struct usb_serial_port *port)
 101{
 102        dbg("%s - port %d", __func__, port->number);
 103
 104        usb_kill_urb(port->interrupt_in_urb);
 105}
 106
 107static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
 108                        const unsigned char *buf, int count)
 109{
 110        dbg("%s - port %d", __func__, port->number);
 111
 112        /*
 113         * This device can't write any data, only read from the device
 114         */
 115        return -EOPNOTSUPP;
 116}
 117
 118static struct usb_serial_driver navman_device = {
 119        .driver = {
 120                .owner =        THIS_MODULE,
 121                .name =         "navman",
 122        },
 123        .id_table =             id_table,
 124        .usb_driver =           &navman_driver,
 125        .num_ports =            1,
 126        .open =                 navman_open,
 127        .close =                navman_close,
 128        .write =                navman_write,
 129        .read_int_callback =    navman_read_int_callback,
 130};
 131
 132static int __init navman_init(void)
 133{
 134        int retval;
 135
 136        retval = usb_serial_register(&navman_device);
 137        if (retval)
 138                return retval;
 139        retval = usb_register(&navman_driver);
 140        if (retval)
 141                usb_serial_deregister(&navman_device);
 142        return retval;
 143}
 144
 145static void __exit navman_exit(void)
 146{
 147        usb_deregister(&navman_driver);
 148        usb_serial_deregister(&navman_device);
 149}
 150
 151module_init(navman_init);
 152module_exit(navman_exit);
 153MODULE_LICENSE("GPL");
 154
 155module_param(debug, bool, S_IRUGO | S_IWUSR);
 156MODULE_PARM_DESC(debug, "Debug enabled or not");
 157