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
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/tty.h>
  14 #include <linux/tty_flip.h>
  15 #include <linux/module.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/serial.h>
  18
  19 static int debug;
  20
  21 static struct usb_device_id id_table [] = {
  22         { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  23         { },
  24 };
  25 MODULE_DEVICE_TABLE(usb, id_table);
  26
  27 static struct usb_driver navman_driver = {
  28         .name =         "navman",
  29         .probe =        usb_serial_probe,
  30         .disconnect =   usb_serial_disconnect,
  31         .id_table =     id_table,
  32         .no_dynamic_id =        1,
  33 };
  34
  35 static void navman_read_int_callback(struct urb *urb, struct pt_regs *regs)
  36 {
  37         struct usb_serial_port *port = urb->context;
  38         unsigned char *data = urb->transfer_buffer;
  39         struct tty_struct *tty;
  40         int result;
  41
  42         switch (urb->status) {
  43         case 0:
  44                 /* success */
  45                 break;
  46         case -ECONNRESET:
  47         case -ENOENT:
  48         case -ESHUTDOWN:
  49                 /* this urb is terminated, clean up */
  50                 dbg("%s - urb shutting down with status: %d",
  51                     __FUNCTION__, urb->status);
  52                 return;
  53         default:
  54                 dbg("%s - nonzero urb status received: %d",
  55                     __FUNCTION__, urb->status);
  56                 goto exit;
  57         }
  58
  59         usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
  60                               urb->actual_length, data);
  61
  62         tty = port->tty;
  63         if (tty && urb->actual_length) {
  64                 tty_buffer_request_room(tty, urb->actual_length);
  65                 tty_insert_flip_string(tty, data, urb->actual_length);
  66                 tty_flip_buffer_push(tty);
  67         }
  68
  69 exit:
  70         result = usb_submit_urb(urb, GFP_ATOMIC);
  71         if (result)
  72                 dev_err(&urb->dev->dev,
  73                         "%s - Error %d submitting interrupt urb\n",
  74                         __FUNCTION__, result);
  75 }
  76
  77 static int navman_open(struct usb_serial_port *port, struct file *filp)
  78 {
  79         int result = 0;
  80
  81         dbg("%s - port %d", __FUNCTION__, port->number);
  82
  83         if (port->interrupt_in_urb) {
  84                 dbg("%s - adding interrupt input for treo", __FUNCTION__);
  85                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  86                 if (result)
  87                         dev_err(&port->dev,
  88                                 "%s - failed submitting interrupt urb, error %d\n",
  89                                 __FUNCTION__, result);
  90         }
  91         return result;
  92 }
  93
  94 static void navman_close(struct usb_serial_port *port, struct file *filp)
  95 {
  96         dbg("%s - port %d", __FUNCTION__, port->number);
  97
  98         if (port->interrupt_in_urb)
  99                 usb_kill_urb(port->interrupt_in_urb);
 100 }
 101
 102 static int navman_write(struct usb_serial_port *port,
 103                         const unsigned char *buf, int count)
 104 {
 105         dbg("%s - port %d", __FUNCTION__, port->number);
 106
 107         /*
 108          * This device can't write any data, only read from the device
 109          * so we just silently eat all data sent to us and say it was
 110          * successfully sent.
 111          * Evil, I know, but do you have a better idea?
 112          */
 113
 114         return count;
 115 }
 116
 117 static struct usb_serial_driver navman_device = {
 118         .driver = {
 119                 .owner =        THIS_MODULE,
 120                 .name =         "navman",
 121         },
 122         .id_table =             id_table,
 123         .num_interrupt_in =     NUM_DONT_CARE,
 124         .num_bulk_in =          NUM_DONT_CARE,
 125         .num_bulk_out =         NUM_DONT_CARE,
 126         .num_ports =            1,
 127         .open =                 navman_open,
 128         .close =                navman_close,
 129         .write =                navman_write,
 130         .read_int_callback =    navman_read_int_callback,
 131 };
 132
 133 static int __init navman_init(void)
 134 {
 135         int retval;
 136
 137         retval = usb_serial_register(&navman_device);
 138         if (retval)
 139                 return retval;
 140         retval = usb_register(&navman_driver);
 141         if (retval)
 142                 usb_serial_deregister(&navman_device);
 143         return retval;
 144 }
 145
 146 static void __exit navman_exit(void)
 147 {
 148         usb_deregister(&navman_driver);
 149         usb_serial_deregister(&navman_device);
 150 }
 151
 152 module_init(navman_init);
 153 module_exit(navman_exit);
 154 MODULE_LICENSE("GPL");
 155
 156 module_param(debug, bool, S_IRUGO | S_IWUSR);
 157 MODULE_PARM_DESC(debug, "Debug enabled or not");