navman.c

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/*
 * Navman Serial USB driver
 *
 * Copyright (C) 2006 Greg Kroah-Hartman <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  version 2 as published by the Free Software Foundation.
 *
 * TODO:
 *  Add termios method that uses copy_hw but also kills all echo
 *  flags as the navman is rx only so cannot echo.
 */

#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

static const struct usb_device_id id_table[] = {
    { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
    { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
    { },
};
MODULE_DEVICE_TABLE(usb, id_table);

static void navman_read_int_callback(struct urb *urb)
{
    struct usb_serial_port *port = urb->context;
    unsigned char *data = urb->transfer_buffer;
    struct tty_struct *tty;
    int status = urb->status;
    int result;

    switch (status) {
    case 0:
        /* success */
        break;
    case -ECONNRESET:
    case -ENOENT:
    case -ESHUTDOWN:
        /* this urb is terminated, clean up */
        dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
            __func__, status);
        return;
    default:
        dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
            __func__, status);
        goto exit;
    }

    usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);

    tty = tty_port_tty_get(&port->port);
    if (tty && urb->actual_length) {
        tty_insert_flip_string(tty, data, urb->actual_length);
        tty_flip_buffer_push(tty);
    }
    tty_kref_put(tty);

exit:
    result = usb_submit_urb(urb, GFP_ATOMIC);
    if (result)
        dev_err(&urb->dev->dev,
            "%s - Error %d submitting interrupt urb\n",
            __func__, result);
}

static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
{
    int result = 0;

    if (port->interrupt_in_urb) {
        dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
            __func__);
        result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
        if (result)
            dev_err(&port->dev,
                "%s - failed submitting interrupt urb, error %d\n",
                __func__, result);
    }
    return result;
}

static void navman_close(struct usb_serial_port *port)
{
    usb_kill_urb(port->interrupt_in_urb);
}

static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
            const unsigned char *buf, int count)
{
    /*
     * This device can't write any data, only read from the device
     */
    return -EOPNOTSUPP;
}

static struct usb_serial_driver navman_device = {
    .driver = {
        .owner =    THIS_MODULE,
        .name =     "navman",
    },
    .id_table =     id_table,
    .num_ports =        1,
    .open =         navman_open,
    .close =        navman_close,
    .write =        navman_write,
    .read_int_callback =    navman_read_int_callback,
};

static struct usb_serial_driver * const serial_drivers[] = {
    &navman_device, NULL
};

module_usb_serial_driver(serial_drivers, id_table);

MODULE_LICENSE("GPL");