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
24static bool debug;
25
26static const struct usb_device_id id_table[] = {
27	{ USB_DEVICE(0x0a99, 0x0001) },	/* Talon Technology device */
28	{ USB_DEVICE(0x0df7, 0x0900) },	/* Mobile Action i-gotU */
29	{ },
30};
31MODULE_DEVICE_TABLE(usb, id_table);
32
33static struct usb_driver navman_driver = {
34	.name =		"navman",
35	.probe =	usb_serial_probe,
36	.disconnect =	usb_serial_disconnect,
37	.id_table =	id_table,
38};
39
40static void navman_read_int_callback(struct urb *urb)
41{
42	struct usb_serial_port *port = urb->context;
43	unsigned char *data = urb->transfer_buffer;
44	struct tty_struct *tty;
45	int status = urb->status;
46	int result;
47
48	switch (status) {
49	case 0:
50		/* success */
51		break;
52	case -ECONNRESET:
53	case -ENOENT:
54	case -ESHUTDOWN:
55		/* this urb is terminated, clean up */
56		dbg("%s - urb shutting down with status: %d",
57		    __func__, status);
58		return;
59	default:
60		dbg("%s - nonzero urb status received: %d",
61		    __func__, status);
62		goto exit;
63	}
64
65	usb_serial_debug_data(debug, &port->dev, __func__,
66			      urb->actual_length, data);
67
68	tty = tty_port_tty_get(&port->port);
69	if (tty && urb->actual_length) {
70		tty_insert_flip_string(tty, data, urb->actual_length);
71		tty_flip_buffer_push(tty);
72	}
73	tty_kref_put(tty);
74
75exit:
76	result = usb_submit_urb(urb, GFP_ATOMIC);
77	if (result)
78		dev_err(&urb->dev->dev,
79			"%s - Error %d submitting interrupt urb\n",
80			__func__, result);
81}
82
83static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
84{
85	int result = 0;
86
87	dbg("%s - port %d", __func__, port->number);
88
89	if (port->interrupt_in_urb) {
90		dbg("%s - adding interrupt input for treo", __func__);
91		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
92		if (result)
93			dev_err(&port->dev,
94				"%s - failed submitting interrupt urb, error %d\n",
95				__func__, result);
96	}
97	return result;
98}
99
100static void navman_close(struct usb_serial_port *port)
101{
102	dbg("%s - port %d", __func__, port->number);
103
104	usb_kill_urb(port->interrupt_in_urb);
105}
106
107static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
108			const unsigned char *buf, int count)
109{
110	dbg("%s - port %d", __func__, port->number);
111
112	/*
113	 * This device can't write any data, only read from the device
114	 */
115	return -EOPNOTSUPP;
116}
117
118static struct usb_serial_driver navman_device = {
119	.driver = {
120		.owner =	THIS_MODULE,
121		.name =		"navman",
122	},
123	.id_table =		id_table,
124	.num_ports =		1,
125	.open =			navman_open,
126	.close = 		navman_close,
127	.write = 		navman_write,
128	.read_int_callback =	navman_read_int_callback,
129};
130
131static struct usb_serial_driver * const serial_drivers[] = {
132	&navman_device, NULL
133};
134
135module_usb_serial_driver(navman_driver, serial_drivers);
136
137MODULE_LICENSE("GPL");
138
139module_param(debug, bool, S_IRUGO | S_IWUSR);
140MODULE_PARM_DESC(debug, "Debug enabled or not");
141