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