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