cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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empeg.c (3516B)

      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");