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/gfp.h>
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/tty.h>
  19#include <linux/tty_flip.h>
  20#include <linux/module.h>
  21#include <linux/usb.h>
  22#include <linux/usb/serial.h>
  23
  24static int debug;
  25
  26static const struct usb_device_id id_table[] = {
  27        { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  28        { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
  29        { },
  30};
  31MODULE_DEVICE_TABLE(usb, id_table);
  32
  33static struct usb_driver navman_driver = {
  34        .name =         "navman",
  35        .probe =        usb_serial_probe,
  36        .disconnect =   usb_serial_disconnect,
  37        .id_table =     id_table,
  38        .no_dynamic_id =        1,
  39};
  40
  41static void navman_read_int_callback(struct urb *urb)
  42{
  43        struct usb_serial_port *port = urb->context;
  44        unsigned char *data = urb->transfer_buffer;
  45        struct tty_struct *tty;
  46        int status = urb->status;
  47        int result;
  48
  49        switch (status) {
  50        case 0:
  51                /* success */
  52                break;
  53        case -ECONNRESET:
  54        case -ENOENT:
  55        case -ESHUTDOWN:
  56                /* this urb is terminated, clean up */
  57                dbg("%s - urb shutting down with status: %d",
  58                    __func__, status);
  59                return;
  60        default:
  61                dbg("%s - nonzero urb status received: %d",
  62                    __func__, status);
  63                goto exit;
  64        }
  65
  66        usb_serial_debug_data(debug, &port->dev, __func__,
  67                              urb->actual_length, data);
  68
  69        tty = tty_port_tty_get(&port->port);
  70        if (tty && urb->actual_length) {
  71                tty_insert_flip_string(tty, data, urb->actual_length);
  72                tty_flip_buffer_push(tty);
  73        }
  74        tty_kref_put(tty);
  75
  76exit:
  77        result = usb_submit_urb(urb, GFP_ATOMIC);
  78        if (result)
  79                dev_err(&urb->dev->dev,
  80                        "%s - Error %d submitting interrupt urb\n",
  81                        __func__, result);
  82}
  83
  84static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  85{
  86        int result = 0;
  87
  88        dbg("%s - port %d", __func__, port->number);
  89
  90        if (port->interrupt_in_urb) {
  91                dbg("%s - adding interrupt input for treo", __func__);
  92                result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  93                if (result)
  94                        dev_err(&port->dev,
  95                                "%s - failed submitting interrupt urb, error %d\n",
  96                                __func__, result);
  97        }
  98        return result;
  99}
 100
 101static void navman_close(struct usb_serial_port *port)
 102{
 103        dbg("%s - port %d", __func__, port->number);
 104
 105        usb_kill_urb(port->interrupt_in_urb);
 106}
 107
 108static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
 109                        const unsigned char *buf, int count)
 110{
 111        dbg("%s - port %d", __func__, port->number);
 112
 113        /*
 114         * This device can't write any data, only read from the device
 115         */
 116        return -EOPNOTSUPP;
 117}
 118
 119static struct usb_serial_driver navman_device = {
 120        .driver = {
 121                .owner =        THIS_MODULE,
 122                .name =         "navman",
 123        },
 124        .id_table =             id_table,
 125        .usb_driver =           &navman_driver,
 126        .num_ports =            1,
 127        .open =                 navman_open,
 128        .close =                navman_close,
 129        .write =                navman_write,
 130        .read_int_callback =    navman_read_int_callback,
 131};
 132
 133static int __init navman_init(void)
 134{
 135        int retval;
 136
 137        retval = usb_serial_register(&navman_device);
 138        if (retval)
 139                return retval;
 140        retval = usb_register(&navman_driver);
 141        if (retval)
 142                usb_serial_deregister(&navman_device);
 143        return retval;
 144}
 145
 146static void __exit navman_exit(void)
 147{
 148        usb_deregister(&navman_driver);
 149        usb_serial_deregister(&navman_device);
 150}
 151
 152module_init(navman_init);
 153module_exit(navman_exit);
 154MODULE_LICENSE("GPL");
 155
 156module_param(debug, bool, S_IRUGO | S_IWUSR);
 157MODULE_PARM_DESC(debug, "Debug enabled or not");
 158