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
  24 static bool debug;
  25
  26 static 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 };
  31 MODULE_DEVICE_TABLE(usb, id_table);
  32
  33 static 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
  40 static 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
  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         if (port->interrupt_in_urb) {
  88                 dbg("%s - adding interrupt input for treo", __func__);
  89                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  90                 if (result)
  91                         dev_err(&port->dev,
  92                                 "%s - failed submitting interrupt urb, error %d\n",
  93                                 __func__, result);
  94         }
  95         return result;
  96 }
  97
  98 static void navman_close(struct usb_serial_port *port)
  99 {
 100         usb_kill_urb(port->interrupt_in_urb);
 101 }
 102
 103 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
 104                         const unsigned char *buf, int count)
 105 {
 106         /*
 107          * This device can't write any data, only read from the device
 108          */
 109         return -EOPNOTSUPP;
 110 }
 111
 112 static struct usb_serial_driver navman_device = {
 113         .driver = {
 114                 .owner =        THIS_MODULE,
 115                 .name =         "navman",
 116         },
 117         .id_table =             id_table,
 118         .num_ports =            1,
 119         .open =                 navman_open,
 120         .close =                navman_close,
 121         .write =                navman_write,
 122         .read_int_callback =    navman_read_int_callback,
 123 };
 124
 125 static struct usb_serial_driver * const serial_drivers[] = {
 126         &navman_device, NULL
 127 };
 128
 129 module_usb_serial_driver(navman_driver, serial_drivers);
 130
 131 MODULE_LICENSE("GPL");
 132
 133 module_param(debug, bool, S_IRUGO | S_IWUSR);
 134 MODULE_PARM_DESC(debug, "Debug enabled or not");