1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Navman Serial USB driver
4 *
5 * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de>
6 *
7 * TODO:
8 * Add termios method that uses copy_hw but also kills all echo
9 * flags as the navman is rx only so cannot echo.
10 */
11
12 #include <linux/gfp.h>
13 #include <linux/kernel.h>
14 #include <linux/tty.h>
15 #include <linux/tty_flip.h>
16 #include <linux/module.h>
17 #include <linux/usb.h>
18 #include <linux/usb/serial.h>
19
20 static const struct usb_device_id id_table[] = {
21 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
22 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
23 { },
24 };
25 MODULE_DEVICE_TABLE(usb, id_table);
26
navman_read_int_callback(struct urb * urb)27 static void navman_read_int_callback(struct urb *urb)
28 {
29 struct usb_serial_port *port = urb->context;
30 unsigned char *data = urb->transfer_buffer;
31 int status = urb->status;
32 int result;
33
34 switch (status) {
35 case 0:
36 /* success */
37 break;
38 case -ECONNRESET:
39 case -ENOENT:
40 case -ESHUTDOWN:
41 /* this urb is terminated, clean up */
42 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
43 __func__, status);
44 return;
45 default:
46 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
47 __func__, status);
48 goto exit;
49 }
50
51 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
52
53 if (urb->actual_length) {
54 tty_insert_flip_string(&port->port, data, urb->actual_length);
55 tty_flip_buffer_push(&port->port);
56 }
57
58 exit:
59 result = usb_submit_urb(urb, GFP_ATOMIC);
60 if (result)
61 dev_err(&urb->dev->dev,
62 "%s - Error %d submitting interrupt urb\n",
63 __func__, result);
64 }
65
navman_open(struct tty_struct * tty,struct usb_serial_port * port)66 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
67 {
68 int result = 0;
69
70 if (port->interrupt_in_urb) {
71 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
72 __func__);
73 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
74 if (result)
75 dev_err(&port->dev,
76 "%s - failed submitting interrupt urb, error %d\n",
77 __func__, result);
78 }
79 return result;
80 }
81
navman_close(struct usb_serial_port * port)82 static void navman_close(struct usb_serial_port *port)
83 {
84 usb_kill_urb(port->interrupt_in_urb);
85 }
86
navman_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)87 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
88 const unsigned char *buf, int count)
89 {
90 /*
91 * This device can't write any data, only read from the device
92 */
93 return -EOPNOTSUPP;
94 }
95
96 static struct usb_serial_driver navman_device = {
97 .driver = {
98 .owner = THIS_MODULE,
99 .name = "navman",
100 },
101 .id_table = id_table,
102 .num_ports = 1,
103 .open = navman_open,
104 .close = navman_close,
105 .write = navman_write,
106 .read_int_callback = navman_read_int_callback,
107 };
108
109 static struct usb_serial_driver * const serial_drivers[] = {
110 &navman_device, NULL
111 };
112
113 module_usb_serial_driver(serial_drivers, id_table);
114
115 MODULE_LICENSE("GPL v2");
116