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/tty.h>
18#include <linux/tty_flip.h>
19#include <linux/module.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22
23static const struct usb_device_id id_table[] = {
24	{ USB_DEVICE(0x0a99, 0x0001) },	/* Talon Technology device */
25	{ USB_DEVICE(0x0df7, 0x0900) },	/* Mobile Action i-gotU */
26	{ },
27};
28MODULE_DEVICE_TABLE(usb, id_table);
29
30static void navman_read_int_callback(struct urb *urb)
31{
32	struct usb_serial_port *port = urb->context;
33	unsigned char *data = urb->transfer_buffer;
34	int status = urb->status;
35	int result;
36
37	switch (status) {
38	case 0:
39		/* success */
40		break;
41	case -ECONNRESET:
42	case -ENOENT:
43	case -ESHUTDOWN:
44		/* this urb is terminated, clean up */
45		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
46			__func__, status);
47		return;
48	default:
49		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
50			__func__, status);
51		goto exit;
52	}
53
54	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
55
56	if (urb->actual_length) {
57		tty_insert_flip_string(&port->port, data, urb->actual_length);
58		tty_flip_buffer_push(&port->port);
59	}
60
61exit:
62	result = usb_submit_urb(urb, GFP_ATOMIC);
63	if (result)
64		dev_err(&urb->dev->dev,
65			"%s - Error %d submitting interrupt urb\n",
66			__func__, result);
67}
68
69static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
70{
71	int result = 0;
72
73	if (port->interrupt_in_urb) {
74		dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
75			__func__);
76		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
77		if (result)
78			dev_err(&port->dev,
79				"%s - failed submitting interrupt urb, error %d\n",
80				__func__, result);
81	}
82	return result;
83}
84
85static void navman_close(struct usb_serial_port *port)
86{
87	usb_kill_urb(port->interrupt_in_urb);
88}
89
90static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
91			const unsigned char *buf, int count)
92{
93	/*
94	 * This device can't write any data, only read from the device
95	 */
96	return -EOPNOTSUPP;
97}
98
99static struct usb_serial_driver navman_device = {
100	.driver = {
101		.owner =	THIS_MODULE,
102		.name =		"navman",
103	},
104	.id_table =		id_table,
105	.num_ports =		1,
106	.open =			navman_open,
107	.close = 		navman_close,
108	.write = 		navman_write,
109	.read_int_callback =	navman_read_int_callback,
110};
111
112static struct usb_serial_driver * const serial_drivers[] = {
113	&navman_device, NULL
114};
115
116module_usb_serial_driver(serial_drivers, id_table);
117
118MODULE_LICENSE("GPL");
119