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
  23 static 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 };
  28 MODULE_DEVICE_TABLE(usb, id_table);
  29
  30 static 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
  61 exit:
  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
  69 static 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
  85 static void navman_close(struct usb_serial_port *port)
  86 {
  87         usb_kill_urb(port->interrupt_in_urb);
  88 }
  89
  90 static 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
  99 static 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
 112 static struct usb_serial_driver * const serial_drivers[] = {
 113         &navman_device, NULL
 114 };
 115
 116 module_usb_serial_driver(serial_drivers, id_table);
 117
 118 MODULE_LICENSE("GPL");