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 */
34 static int empeg_startup(struct usb_serial *serial);
35 static void empeg_init_termios(struct tty_struct *tty);
36
37 static const struct usb_device_id id_table[] = {
38 { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
39 { } /* Terminating entry */
40 };
41
42 MODULE_DEVICE_TABLE(usb, id_table);
43
44 static 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
58 static struct usb_serial_driver * const serial_drivers[] = {
59 &empeg_device, NULL
60 };
61
empeg_startup(struct usb_serial * serial)62 static 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
empeg_init_termios(struct tty_struct * tty)78 static 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
122 module_usb_serial_driver(serial_drivers, id_table);
123
124 MODULE_AUTHOR(DRIVER_AUTHOR);
125 MODULE_DESCRIPTION(DRIVER_DESC);
126 MODULE_LICENSE("GPL v2");
127