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 .name = "empeg",
47 },
48 .id_table = id_table,
49 .num_ports = 1,
50 .bulk_out_size = 256,
51 .throttle = usb_serial_generic_throttle,
52 .unthrottle = usb_serial_generic_unthrottle,
53 .attach = empeg_startup,
54 .init_termios = empeg_init_termios,
55};
56
57static struct usb_serial_driver * const serial_drivers[] = {
58 &empeg_device, NULL
59};
60
61static int empeg_startup(struct usb_serial *serial)
62{
63 int r;
64
65 if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
66 dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
67 serial->dev->actconfig->desc.bConfigurationValue);
68 return -ENODEV;
69 }
70
71 r = usb_reset_configuration(dev: serial->dev);
72
73 /* continue on with initialization */
74 return r;
75}
76
77static void empeg_init_termios(struct tty_struct *tty)
78{
79 struct ktermios *termios = &tty->termios;
80
81 /*
82 * The empeg-car player wants these particular tty settings.
83 * You could, for example, change the baud rate, however the
84 * player only supports 115200 (currently), so there is really
85 * no point in support for changes to the tty settings.
86 * (at least for now)
87 *
88 * The default requirements for this device are:
89 */
90 termios->c_iflag
91 &= ~(IGNBRK /* disable ignore break */
92 | BRKINT /* disable break causes interrupt */
93 | PARMRK /* disable mark parity errors */
94 | ISTRIP /* disable clear high bit of input characters */
95 | INLCR /* disable translate NL to CR */
96 | IGNCR /* disable ignore CR */
97 | ICRNL /* disable translate CR to NL */
98 | IXON); /* disable enable XON/XOFF flow control */
99
100 termios->c_oflag
101 &= ~OPOST; /* disable postprocess output characters */
102
103 termios->c_lflag
104 &= ~(ECHO /* disable echo input characters */
105 | ECHONL /* disable echo new line */
106 | ICANON /* disable erase, kill, werase, and rprnt special characters */
107 | ISIG /* disable interrupt, quit, and suspend special characters */
108 | IEXTEN); /* disable non-POSIX special characters */
109
110 termios->c_cflag
111 &= ~(CSIZE /* no size */
112 | PARENB /* disable parity bit */
113 | CBAUD); /* clear current baud rate */
114
115 termios->c_cflag
116 |= CS8; /* character size 8 bits */
117
118 tty_encode_baud_rate(tty, ibaud: 115200, obaud: 115200);
119}
120
121module_usb_serial_driver(serial_drivers, id_table);
122
123MODULE_AUTHOR(DRIVER_AUTHOR);
124MODULE_DESCRIPTION(DRIVER_DESC);
125MODULE_LICENSE("GPL v2");
126

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source code of linux/drivers/usb/serial/empeg.c