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         .id_table =     id_table,
  36 };
  37
  38 static void navman_read_int_callback(struct urb *urb)
  39 {
  40         struct usb_serial_port *port = urb->context;
  41         unsigned char *data = urb->transfer_buffer;
  42         struct tty_struct *tty;
  43         int status = urb->status;
  44         int result;
  45
  46         switch (status) {
  47         case 0:
  48                 /* success */
  49                 break;
  50         case -ECONNRESET:
  51         case -ENOENT:
  52         case -ESHUTDOWN:
  53                 /* this urb is terminated, clean up */
  54                 dbg("%s - urb shutting down with status: %d",
  55                     __func__, status);
  56                 return;
  57         default:
  58                 dbg("%s - nonzero urb status received: %d",
  59                     __func__, status);
  60                 goto exit;
  61         }
  62
  63         usb_serial_debug_data(debug, &port->dev, __func__,
  64                               urb->actual_length, data);
  65
  66         tty = tty_port_tty_get(&port->port);
  67         if (tty && urb->actual_length) {
  68                 tty_insert_flip_string(tty, data, urb->actual_length);
  69                 tty_flip_buffer_push(tty);
  70         }
  71         tty_kref_put(tty);
  72
  73 exit:
  74         result = usb_submit_urb(urb, GFP_ATOMIC);
  75         if (result)
  76                 dev_err(&urb->dev->dev,
  77                         "%s - Error %d submitting interrupt urb\n",
  78                         __func__, result);
  79 }
  80
  81 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  82 {
  83         int result = 0;
  84
  85         if (port->interrupt_in_urb) {
  86                 dbg("%s - adding interrupt input for treo", __func__);
  87                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  88                 if (result)
  89                         dev_err(&port->dev,
  90                                 "%s - failed submitting interrupt urb, error %d\n",
  91                                 __func__, result);
  92         }
  93         return result;
  94 }
  95
  96 static void navman_close(struct usb_serial_port *port)
  97 {
  98         usb_kill_urb(port->interrupt_in_urb);
  99 }
 100
 101 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
 102                         const unsigned char *buf, int count)
 103 {
 104         /*
 105          * This device can't write any data, only read from the device
 106          */
 107         return -EOPNOTSUPP;
 108 }
 109
 110 static struct usb_serial_driver navman_device = {
 111         .driver = {
 112                 .owner =        THIS_MODULE,
 113                 .name =         "navman",
 114         },
 115         .id_table =             id_table,
 116         .num_ports =            1,
 117         .open =                 navman_open,
 118         .close =                navman_close,
 119         .write =                navman_write,
 120         .read_int_callback =    navman_read_int_callback,
 121 };
 122
 123 static struct usb_serial_driver * const serial_drivers[] = {
 124         &navman_device, NULL
 125 };
 126
 127 module_usb_serial_driver(navman_driver, serial_drivers);
 128
 129 MODULE_LICENSE("GPL");
 130
 131 module_param(debug, bool, S_IRUGO | S_IWUSR);
 132 MODULE_PARM_DESC(debug, "Debug enabled or not");