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