Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee13...
[linux-2.6] / drivers / usb / serial / navman.c
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
19 static int debug;
20
21 static struct usb_device_id id_table [] = {
22         { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
23         { },
24 };
25 MODULE_DEVICE_TABLE(usb, id_table);
26
27 static 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
35 static 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
69 exit:
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
77 static 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
94 static void navman_close(struct usb_serial_port *port, struct file *filp)
95 {
96         dbg("%s - port %d", __FUNCTION__, port->number);
97
98         if (port->interrupt_in_urb)
99                 usb_kill_urb(port->interrupt_in_urb);
100 }
101
102 static int navman_write(struct usb_serial_port *port,
103                         const unsigned char *buf, int count)
104 {
105         dbg("%s - port %d", __FUNCTION__, port->number);
106
107         /*
108          * This device can't write any data, only read from the device
109          * so we just silently eat all data sent to us and say it was
110          * successfully sent.
111          * Evil, I know, but do you have a better idea?
112          */
113
114         return count;
115 }
116
117 static struct usb_serial_driver navman_device = {
118         .driver = {
119                 .owner =        THIS_MODULE,
120                 .name =         "navman",
121         },
122         .id_table =             id_table,
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
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");