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
19static int debug;
20
21static struct usb_device_id id_table [] = {
22	{ USB_DEVICE(0x0a99, 0x0001) },	/* Talon Technology device */
23	{ },
24};
25MODULE_DEVICE_TABLE(usb, id_table);
26
27static 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
35static void navman_read_int_callback(struct urb *urb)
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
69exit:
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
77static 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
94static void navman_close(struct usb_serial_port *port, struct file *filp)
95{
96	dbg("%s - port %d", __FUNCTION__, port->number);
97
98	usb_kill_urb(port->interrupt_in_urb);
99}
100
101static int navman_write(struct usb_serial_port *port,
102			const unsigned char *buf, int count)
103{
104	dbg("%s - port %d", __FUNCTION__, port->number);
105
106	/*
107	 * This device can't write any data, only read from the device
108	 * so we just silently eat all data sent to us and say it was
109	 * successfully sent.
110	 * Evil, I know, but do you have a better idea?
111	 */
112
113	return count;
114}
115
116static struct usb_serial_driver navman_device = {
117	.driver = {
118		.owner =	THIS_MODULE,
119		.name =		"navman",
120	},
121	.id_table =		id_table,
122	.usb_driver =		&navman_driver,
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
133static 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
146static void __exit navman_exit(void)
147{
148	usb_deregister(&navman_driver);
149	usb_serial_deregister(&navman_device);
150}
151
152module_init(navman_init);
153module_exit(navman_exit);
154MODULE_LICENSE("GPL");
155
156module_param(debug, bool, S_IRUGO | S_IWUSR);
157MODULE_PARM_DESC(debug, "Debug enabled or not");
158