drivers/usb/serial/anydata.c

   1 /*
   2  * AnyData CDMA Serial USB driver
   3  *
   4  * Copyright (C) 2005 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 version
   8  *      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/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb/serial.h>
  17
  18 static struct usb_device_id id_table [] = {
  19         { USB_DEVICE(0x16d5, 0x6501) }, /* AirData CDMA device */
  20         { },
  21 };
  22 MODULE_DEVICE_TABLE(usb, id_table);
  23
  24 /* if overridden by the user, then use their value for the size of the
  25  * read and write urbs */
  26 static int buffer_size;
  27 static int debug;
  28
  29 static struct usb_driver anydata_driver = {
  30         .name =         "anydata",
  31         .probe =        usb_serial_probe,
  32         .disconnect =   usb_serial_disconnect,
  33         .id_table =     id_table,
  34         .no_dynamic_id =        1,
  35 };
  36
  37 static int anydata_open(struct usb_serial_port *port, struct file *filp)
  38 {
  39         char *buffer;
  40         int result = 0;
  41
  42         dbg("%s - port %d", __FUNCTION__, port->number);
  43
  44         if (buffer_size) {
  45                 /* override the default buffer sizes */
  46                 buffer = kmalloc(buffer_size, GFP_KERNEL);
  47                 if (!buffer) {
  48                         dev_err(&port->dev, "%s - out of memory.\n",
  49                                 __FUNCTION__);
  50                         return -ENOMEM;
  51                 }
  52                 kfree (port->read_urb->transfer_buffer);
  53                 port->read_urb->transfer_buffer = buffer;
  54                 port->read_urb->transfer_buffer_length = buffer_size;
  55
  56                 buffer = kmalloc(buffer_size, GFP_KERNEL);
  57                 if (!buffer) {
  58                         dev_err(&port->dev, "%s - out of memory.\n",
  59                                 __FUNCTION__);
  60                         return -ENOMEM;
  61                 }
  62                 kfree (port->write_urb->transfer_buffer);
  63                 port->write_urb->transfer_buffer = buffer;
  64                 port->write_urb->transfer_buffer_length = buffer_size;
  65                 port->bulk_out_size = buffer_size;
  66         }
  67
  68         /* Start reading from the device */
  69         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
  70                           usb_rcvbulkpipe(port->serial->dev,
  71                                           port->bulk_in_endpointAddress),
  72                           port->read_urb->transfer_buffer,
  73                           port->read_urb->transfer_buffer_length,
  74                           usb_serial_generic_read_bulk_callback, port);
  75         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
  76         if (result)
  77                 dev_err(&port->dev,
  78                         "%s - failed submitting read urb, error %d\n",
  79                         __FUNCTION__, result);
  80
  81         return result;
  82 }
  83
  84 static struct usb_serial_driver anydata_device = {
  85         .driver = {
  86                 .owner =        THIS_MODULE,
  87                 .name =         "anydata",
  88         },
  89         .id_table =             id_table,
  90         .num_interrupt_in =     NUM_DONT_CARE,
  91         .num_bulk_in =          NUM_DONT_CARE,
  92         .num_bulk_out =         NUM_DONT_CARE,
  93         .num_ports =            1,
  94         .open =                 anydata_open,
  95 };
  96
  97 static int __init anydata_init(void)
  98 {
  99         int retval;
 100
 101         retval = usb_serial_register(&anydata_device);
 102         if (retval)
 103                 return retval;
 104         retval = usb_register(&anydata_driver);
 105         if (retval)
 106                 usb_serial_deregister(&anydata_device);
 107         return retval;
 108 }
 109
 110 static void __exit anydata_exit(void)
 111 {
 112         usb_deregister(&anydata_driver);
 113         usb_serial_deregister(&anydata_device);
 114 }
 115
 116 module_init(anydata_init);
 117 module_exit(anydata_exit);
 118 MODULE_LICENSE("GPL");
 119
 120 module_param(debug, bool, S_IRUGO | S_IWUSR);
 121 MODULE_PARM_DESC(debug, "Debug enabled or not");
 122 module_param(buffer_size, int, 0);
 123 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");