1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Empeg empeg-car player driver
4 *
5 *	Copyright (C) 2000, 2001
6 *	    Gary Brubaker (xavyer@ix.netcom.com)
7 *
8 *	Copyright (C) 1999 - 2001
9 *	    Greg Kroah-Hartman (greg@kroah.com)
10 *
11 * See Documentation/usb/usb-serial.rst for more information on using this
12 * driver
13 */
14
15#include <linux/kernel.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/tty.h>
19#include <linux/tty_driver.h>
20#include <linux/tty_flip.h>
21#include <linux/module.h>
22#include <linux/spinlock.h>
23#include <linux/uaccess.h>
24#include <linux/usb.h>
25#include <linux/usb/serial.h>
26
27#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>"
28#define DRIVER_DESC "USB Empeg Mark I/II Driver"
29
30#define EMPEG_VENDOR_ID			0x084f
31#define EMPEG_PRODUCT_ID		0x0001
32
33/* function prototypes for an empeg-car player */
34static int  empeg_startup(struct usb_serial *serial);
35static void empeg_init_termios(struct tty_struct *tty);
36
37static const struct usb_device_id id_table[] = {
38	{ USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
39	{ }					/* Terminating entry */
40};
41
42MODULE_DEVICE_TABLE(usb, id_table);
43
44static struct usb_serial_driver empeg_device = {
45	.driver = {
46		.owner =	THIS_MODULE,
47		.name =		"empeg",
48	},
49	.id_table =		id_table,
50	.num_ports =		1,
51	.bulk_out_size =	256,
52	.throttle =		usb_serial_generic_throttle,
53	.unthrottle =		usb_serial_generic_unthrottle,
54	.attach =		empeg_startup,
55	.init_termios =		empeg_init_termios,
56};
57
58static struct usb_serial_driver * const serial_drivers[] = {
59	&empeg_device, NULL
60};
61
62static int empeg_startup(struct usb_serial *serial)
63{
64	int r;
65
66	if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
67		dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
68			serial->dev->actconfig->desc.bConfigurationValue);
69		return -ENODEV;
70	}
71
72	r = usb_reset_configuration(serial->dev);
73
74	/* continue on with initialization */
75	return r;
76}
77
78static void empeg_init_termios(struct tty_struct *tty)
79{
80	struct ktermios *termios = &tty->termios;
81
82	/*
83	 * The empeg-car player wants these particular tty settings.
84	 * You could, for example, change the baud rate, however the
85	 * player only supports 115200 (currently), so there is really
86	 * no point in support for changes to the tty settings.
87	 * (at least for now)
88	 *
89	 * The default requirements for this device are:
90	 */
91	termios->c_iflag
92		&= ~(IGNBRK	/* disable ignore break */
93		| BRKINT	/* disable break causes interrupt */
94		| PARMRK	/* disable mark parity errors */
95		| ISTRIP	/* disable clear high bit of input characters */
96		| INLCR		/* disable translate NL to CR */
97		| IGNCR		/* disable ignore CR */
98		| ICRNL		/* disable translate CR to NL */
99		| IXON);	/* disable enable XON/XOFF flow control */
100
101	termios->c_oflag
102		&= ~OPOST;	/* disable postprocess output characters */
103
104	termios->c_lflag
105		&= ~(ECHO	/* disable echo input characters */
106		| ECHONL	/* disable echo new line */
107		| ICANON	/* disable erase, kill, werase, and rprnt special characters */
108		| ISIG		/* disable interrupt, quit, and suspend special characters */
109		| IEXTEN);	/* disable non-POSIX special characters */
110
111	termios->c_cflag
112		&= ~(CSIZE	/* no size */
113		| PARENB	/* disable parity bit */
114		| CBAUD);	/* clear current baud rate */
115
116	termios->c_cflag
117		|= CS8;		/* character size 8 bits */
118
119	tty_encode_baud_rate(tty, 115200, 115200);
120}
121
122module_usb_serial_driver(serial_drivers, id_table);
123
124MODULE_AUTHOR(DRIVER_AUTHOR);
125MODULE_DESCRIPTION(DRIVER_DESC);
126MODULE_LICENSE("GPL v2");
127