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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usb_debug.c (2297B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * USB Debug cable driver
      4 *
      5 * Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
      6 */
      7
      8#include <linux/gfp.h>
      9#include <linux/kernel.h>
     10#include <linux/tty.h>
     11#include <linux/module.h>
     12#include <linux/usb.h>
     13#include <linux/usb/serial.h>
     14
     15#define USB_DEBUG_MAX_PACKET_SIZE	8
     16#define USB_DEBUG_BRK_SIZE		8
     17static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
     18	0x00,
     19	0xff,
     20	0x01,
     21	0xfe,
     22	0x00,
     23	0xfe,
     24	0x01,
     25	0xff,
     26};
     27
     28static const struct usb_device_id id_table[] = {
     29	{ USB_DEVICE(0x0525, 0x127a) },
     30	{ },
     31};
     32
     33static const struct usb_device_id dbc_id_table[] = {
     34	{ USB_DEVICE(0x1d6b, 0x0010) },
     35	{ USB_DEVICE(0x1d6b, 0x0011) },
     36	{ },
     37};
     38
     39static const struct usb_device_id id_table_combined[] = {
     40	{ USB_DEVICE(0x0525, 0x127a) },
     41	{ USB_DEVICE(0x1d6b, 0x0010) },
     42	{ USB_DEVICE(0x1d6b, 0x0011) },
     43	{ },
     44};
     45MODULE_DEVICE_TABLE(usb, id_table_combined);
     46
     47/* This HW really does not support a serial break, so one will be
     48 * emulated when ever the break state is set to true.
     49 */
     50static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
     51{
     52	struct usb_serial_port *port = tty->driver_data;
     53	if (!break_state)
     54		return;
     55	usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
     56}
     57
     58static void usb_debug_process_read_urb(struct urb *urb)
     59{
     60	struct usb_serial_port *port = urb->context;
     61
     62	if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
     63		memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
     64						USB_DEBUG_BRK_SIZE) == 0) {
     65		usb_serial_handle_break(port);
     66		return;
     67	}
     68
     69	usb_serial_generic_process_read_urb(urb);
     70}
     71
     72static struct usb_serial_driver debug_device = {
     73	.driver = {
     74		.owner =	THIS_MODULE,
     75		.name =		"debug",
     76	},
     77	.id_table =		id_table,
     78	.num_ports =		1,
     79	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,
     80	.break_ctl =		usb_debug_break_ctl,
     81	.process_read_urb =	usb_debug_process_read_urb,
     82};
     83
     84static struct usb_serial_driver dbc_device = {
     85	.driver = {
     86		.owner =	THIS_MODULE,
     87		.name =		"xhci_dbc",
     88	},
     89	.id_table =		dbc_id_table,
     90	.num_ports =		1,
     91	.break_ctl =		usb_debug_break_ctl,
     92	.process_read_urb =	usb_debug_process_read_urb,
     93};
     94
     95static struct usb_serial_driver * const serial_drivers[] = {
     96	&debug_device, &dbc_device, NULL
     97};
     98
     99module_usb_serial_driver(serial_drivers, id_table_combined);
    100MODULE_LICENSE("GPL v2");