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/kernel.h>
16 #include <linux/init.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
23 static int debug;
24
25 static struct usb_device_id id_table [] = {
26 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
27 { },
28 };
29 MODULE_DEVICE_TABLE(usb, id_table);
30
31 static struct usb_driver navman_driver = {
32 .name = "navman",
33 .probe = usb_serial_probe,
34 .disconnect = usb_serial_disconnect,
35 .id_table = id_table,
36 .no_dynamic_id = 1,
37 };
38
39 static void navman_read_int_callback(struct urb *urb)
40 {
41 struct usb_serial_port *port = urb->context;
42 unsigned char *data = urb->transfer_buffer;
43 struct tty_struct *tty;
44 int status = urb->status;
45 int result;
46
47 switch (status) {
48 case 0:
49 /* success */
50 break;
51 case -ECONNRESET:
52 case -ENOENT:
53 case -ESHUTDOWN:
54 /* this urb is terminated, clean up */
55 dbg("%s - urb shutting down with status: %d",
56 __func__, status);
57 return;
58 default:
59 dbg("%s - nonzero urb status received: %d",
60 __func__, status);
61 goto exit;
62 }
63
64 usb_serial_debug_data(debug, &port->dev, __func__,
65 urb->actual_length, data);
66
67 tty = tty_port_tty_get(&port->port);
68 if (tty && urb->actual_length) {
69 tty_buffer_request_room(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
75 exit:
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
83 static int navman_open(struct tty_struct *tty,
84 struct usb_serial_port *port, struct file *filp)
85 {
86 int result = 0;
87
88 dbg("%s - port %d", __func__, port->number);
89
90 if (port->interrupt_in_urb) {
91 dbg("%s - adding interrupt input for treo", __func__);
92 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
93 if (result)
94 dev_err(&port->dev,
95 "%s - failed submitting interrupt urb, error %d\n",
96 __func__, result);
97 }
98 return result;
99 }
100
101 static void navman_close(struct usb_serial_port *port)
102 {
103 dbg("%s - port %d", __func__, port->number);
104
105 usb_kill_urb(port->interrupt_in_urb);
106 }
107
108 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
109 const unsigned char *buf, int count)
110 {
111 dbg("%s - port %d", __func__, port->number);
112
113 /*
114 * This device can't write any data, only read from the device
115 */
116 return -EOPNOTSUPP;
117 }
118
119 static struct usb_serial_driver navman_device = {
120 .driver = {
121 .owner = THIS_MODULE,
122 .name = "navman",
123 },
124 .id_table = id_table,
125 .usb_driver = &navman_driver,
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");
158
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