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/kernel.h>
  16 #include <linux/init.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
  23 static int debug;
  24
  25 static struct usb_device_id id_table [] = {
  26         { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  27         { },
  28 };
  29 MODULE_DEVICE_TABLE(usb, id_table);
  30
  31 static struct usb_driver navman_driver = {
  32         .name =         "navman",
  33         .probe =        usb_serial_probe,
  34         .disconnect =   usb_serial_disconnect,
  35         .id_table =     id_table,
  36         .no_dynamic_id =        1,
  37 };
  38
  39 static void navman_read_int_callback(struct urb *urb)
  40 {
  41         struct usb_serial_port *port = urb->context;
  42         unsigned char *data = urb->transfer_buffer;
  43         struct tty_struct *tty;
  44         int status = urb->status;
  45         int result;
  46
  47         switch (status) {
  48         case 0:
  49                 /* success */
  50                 break;
  51         case -ECONNRESET:
  52         case -ENOENT:
  53         case -ESHUTDOWN:
  54                 /* this urb is terminated, clean up */
  55                 dbg("%s - urb shutting down with status: %d",
  56                     __func__, status);
  57                 return;
  58         default:
  59                 dbg("%s - nonzero urb status received: %d",
  60                     __func__, status);
  61                 goto exit;
  62         }
  63
  64         usb_serial_debug_data(debug, &port->dev, __func__,
  65                               urb->actual_length, data);
  66
  67         tty = tty_port_tty_get(&port->port);
  68         if (tty && urb->actual_length) {
  69                 tty_buffer_request_room(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
  75 exit:
  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
  83 static 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
 100 static 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
 107 static 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
 118 static struct usb_serial_driver navman_device = {
 119         .driver = {
 120                 .owner =        THIS_MODULE,
 121                 .name =         "navman",
 122         },
 123         .id_table =             id_table,
 124         .usb_driver =           &navman_driver,
 125         .num_ports =            1,
 126         .open =                 navman_open,
 127         .close =                navman_close,
 128         .write =                navman_write,
 129         .read_int_callback =    navman_read_int_callback,
 130 };
 131
 132 static int __init navman_init(void)
 133 {
 134         int retval;
 135
 136         retval = usb_serial_register(&navman_device);
 137         if (retval)
 138                 return retval;
 139         retval = usb_register(&navman_driver);
 140         if (retval)
 141                 usb_serial_deregister(&navman_device);
 142         return retval;
 143 }
 144
 145 static void __exit navman_exit(void)
 146 {
 147         usb_deregister(&navman_driver);
 148         usb_serial_deregister(&navman_device);
 149 }
 150
 151 module_init(navman_init);
 152 module_exit(navman_exit);
 153 MODULE_LICENSE("GPL");
 154
 155 module_param(debug, bool, S_IRUGO | S_IWUSR);
 156 MODULE_PARM_DESC(debug, "Debug enabled or not");