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
20static 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};
25MODULE_DEVICE_TABLE(usb, id_table);
26
27static 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
58exit:
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
66static 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
82static void navman_close(struct usb_serial_port *port)
83{
84	usb_kill_urb(port->interrupt_in_urb);
85}
86
87static 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
96static 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
109static struct usb_serial_driver * const serial_drivers[] = {
110	&navman_device, NULL
111};
112
113module_usb_serial_driver(serial_drivers, id_table);
114
115MODULE_LICENSE("GPL v2");
116