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 bool 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};
  39
  40static void navman_read_int_callback(struct urb *urb)
  41{
  42        struct usb_serial_port *port = urb->context;
  43        unsigned char *data = urb->transfer_buffer;
  44        struct tty_struct *tty;
  45        int status = urb->status;
  46        int result;
  47
  48        switch (status) {
  49        case 0:
  50                /* success */
  51                break;
  52        case -ECONNRESET:
  53        case -ENOENT:
  54        case -ESHUTDOWN:
  55                /* this urb is terminated, clean up */
  56                dbg("%s - urb shutting down with status: %d",
  57                    __func__, status);
  58                return;
  59        default:
  60                dbg("%s - nonzero urb status received: %d",
  61                    __func__, status);
  62                goto exit;
  63        }
  64
  65        usb_serial_debug_data(debug, &port->dev, __func__,
  66                              urb->actual_length, data);
  67
  68        tty = tty_port_tty_get(&port->port);
  69        if (tty && urb->actual_length) {
  70                tty_insert_flip_string(tty, data, urb->actual_length);
  71                tty_flip_buffer_push(tty);
  72        }
  73        tty_kref_put(tty);
  74
  75exit:
  76        result = usb_submit_urb(urb, GFP_ATOMIC);
  77        if (result)
  78                dev_err(&urb->dev->dev,
  79                        "%s - Error %d submitting interrupt urb\n",
  80                        __func__, result);
  81}
  82
  83static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  84{
  85        int result = 0;
  86
  87        dbg("%s - port %d", __func__, port->number);
  88
  89        if (port->interrupt_in_urb) {
  90                dbg("%s - adding interrupt input for treo", __func__);
  91                result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  92                if (result)
  93                        dev_err(&port->dev,
  94                                "%s - failed submitting interrupt urb, error %d\n",
  95                                __func__, result);
  96        }
  97        return result;
  98}
  99
 100static void navman_close(struct usb_serial_port *port)
 101{
 102        dbg("%s - port %d", __func__, port->number);
 103
 104        usb_kill_urb(port->interrupt_in_urb);
 105}
 106
 107static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
 108                        const unsigned char *buf, int count)
 109{
 110        dbg("%s - port %d", __func__, port->number);
 111
 112        /*
 113         * This device can't write any data, only read from the device
 114         */
 115        return -EOPNOTSUPP;
 116}
 117
 118static struct usb_serial_driver navman_device = {
 119        .driver = {
 120                .owner =        THIS_MODULE,
 121                .name =         "navman",
 122        },
 123        .id_table =             id_table,
 124        .num_ports =            1,
 125        .open =                 navman_open,
 126        .close =                navman_close,
 127        .write =                navman_write,
 128        .read_int_callback =    navman_read_int_callback,
 129};
 130
 131static struct usb_serial_driver * const serial_drivers[] = {
 132        &navman_device, NULL
 133};
 134
 135module_usb_serial_driver(navman_driver, serial_drivers);
 136
 137MODULE_LICENSE("GPL");
 138
 139module_param(debug, bool, S_IRUGO | S_IWUSR);
 140MODULE_PARM_DESC(debug, "Debug enabled or not");
 141