xref: /openbmc/linux/drivers/usb/serial/empeg.c (revision ecefae6d)
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