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 const struct usb_device_id id_table[] = {
  25         { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  26         { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
  27         { },
  28 };
  29 MODULE_DEVICE_TABLE(usb, id_table);
  30
  31 static void navman_read_int_callback(struct urb *urb)
  32 {
  33         struct usb_serial_port *port = urb->context;
  34         unsigned char *data = urb->transfer_buffer;
  35         int status = urb->status;
  36         int result;
  37
  38         switch (status) {
  39         case 0:
  40                 /* success */
  41                 break;
  42         case -ECONNRESET:
  43         case -ENOENT:
  44         case -ESHUTDOWN:
  45                 /* this urb is terminated, clean up */
  46                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
  47                         __func__, status);
  48                 return;
  49         default:
  50                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
  51                         __func__, status);
  52                 goto exit;
  53         }
  54
  55         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
  56
  57         if (urb->actual_length) {
  58                 tty_insert_flip_string(&port->port, data, urb->actual_length);
  59                 tty_flip_buffer_push(&port->port);
  60         }
  61
  62 exit:
  63         result = usb_submit_urb(urb, GFP_ATOMIC);
  64         if (result)
  65                 dev_err(&urb->dev->dev,
  66                         "%s - Error %d submitting interrupt urb\n",
  67                         __func__, result);
  68 }
  69
  70 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  71 {
  72         int result = 0;
  73
  74         if (port->interrupt_in_urb) {
  75                 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
  76                         __func__);
  77                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  78                 if (result)
  79                         dev_err(&port->dev,
  80                                 "%s - failed submitting interrupt urb, error %d\n",
  81                                 __func__, result);
  82         }
  83         return result;
  84 }
  85
  86 static void navman_close(struct usb_serial_port *port)
  87 {
  88         usb_kill_urb(port->interrupt_in_urb);
  89 }
  90
  91 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
  92                         const unsigned char *buf, int count)
  93 {
  94         /*
  95          * This device can't write any data, only read from the device
  96          */
  97         return -EOPNOTSUPP;
  98 }
  99
 100 static struct usb_serial_driver navman_device = {
 101         .driver = {
 102                 .owner =        THIS_MODULE,
 103                 .name =         "navman",
 104         },
 105         .id_table =             id_table,
 106         .num_ports =            1,
 107         .open =                 navman_open,
 108         .close =                navman_close,
 109         .write =                navman_write,
 110         .read_int_callback =    navman_read_int_callback,
 111 };
 112
 113 static struct usb_serial_driver * const serial_drivers[] = {
 114         &navman_device, NULL
 115 };
 116
 117 module_usb_serial_driver(serial_drivers, id_table);
 118
 119 MODULE_LICENSE("GPL");