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 const struct usb_device_id id_table[] = {
  25        { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  26        { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
  27        { },
  28};
  29MODULE_DEVICE_TABLE(usb, id_table);
  30
  31static void navman_read_int_callback(struct urb *urb)
  32{
  33        struct usb_serial_port *port = urb->context;
  34        unsigned char *data = urb->transfer_buffer;
  35        struct tty_struct *tty;
  36        int status = urb->status;
  37        int result;
  38
  39        switch (status) {
  40        case 0:
  41                /* success */
  42                break;
  43        case -ECONNRESET:
  44        case -ENOENT:
  45        case -ESHUTDOWN:
  46                /* this urb is terminated, clean up */
  47                dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
  48                        __func__, status);
  49                return;
  50        default:
  51                dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
  52                        __func__, status);
  53                goto exit;
  54        }
  55
  56        usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
  57
  58        tty = tty_port_tty_get(&port->port);
  59        if (tty && urb->actual_length) {
  60                tty_insert_flip_string(tty, data, urb->actual_length);
  61                tty_flip_buffer_push(tty);
  62        }
  63        tty_kref_put(tty);
  64
  65exit:
  66        result = usb_submit_urb(urb, GFP_ATOMIC);
  67        if (result)
  68                dev_err(&urb->dev->dev,
  69                        "%s - Error %d submitting interrupt urb\n",
  70                        __func__, result);
  71}
  72
  73static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  74{
  75        int result = 0;
  76
  77        if (port->interrupt_in_urb) {
  78                dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
  79                        __func__);
  80                result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  81                if (result)
  82                        dev_err(&port->dev,
  83                                "%s - failed submitting interrupt urb, error %d\n",
  84                                __func__, result);
  85        }
  86        return result;
  87}
  88
  89static void navman_close(struct usb_serial_port *port)
  90{
  91        usb_kill_urb(port->interrupt_in_urb);
  92}
  93
  94static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
  95                        const unsigned char *buf, int count)
  96{
  97        /*
  98         * This device can't write any data, only read from the device
  99         */
 100        return -EOPNOTSUPP;
 101}
 102
 103static struct usb_serial_driver navman_device = {
 104        .driver = {
 105                .owner =        THIS_MODULE,
 106                .name =         "navman",
 107        },
 108        .id_table =             id_table,
 109        .num_ports =            1,
 110        .open =                 navman_open,
 111        .close =                navman_close,
 112        .write =                navman_write,
 113        .read_int_callback =    navman_read_int_callback,
 114};
 115
 116static struct usb_serial_driver * const serial_drivers[] = {
 117        &navman_device, NULL
 118};
 119
 120module_usb_serial_driver(serial_drivers, id_table);
 121
 122MODULE_LICENSE("GPL");
 123