1/*
  2 * USB Debug cable driver
  3 *
  4 * Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
  5 *
  6 *	This program is free software; you can redistribute it and/or
  7 *	modify it under the terms of the GNU General Public License version
  8 *	2 as published by the Free Software Foundation.
  9 */
 10
 11#include <linux/gfp.h>
 12#include <linux/kernel.h>
 13#include <linux/init.h>
 14#include <linux/tty.h>
 15#include <linux/module.h>
 16#include <linux/usb.h>
 17#include <linux/usb/serial.h>
 18
 19#define USB_DEBUG_MAX_PACKET_SIZE	8
 20#define USB_DEBUG_BRK_SIZE		8
 21static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
 22	0x00,
 23	0xff,
 24	0x01,
 25	0xfe,
 26	0x00,
 27	0xfe,
 28	0x01,
 29	0xff,
 30};
 31
 32static const struct usb_device_id id_table[] = {
 33	{ USB_DEVICE(0x0525, 0x127a) },
 34	{ },
 35};
 36MODULE_DEVICE_TABLE(usb, id_table);
 37
 38static struct usb_driver debug_driver = {
 39	.name =		"debug",
 40	.probe =	usb_serial_probe,
 41	.disconnect =	usb_serial_disconnect,
 42	.id_table =	id_table,
 43	.no_dynamic_id = 	1,
 
 
 
 
 
 44};
 
 45
 46/* This HW really does not support a serial break, so one will be
 47 * emulated when ever the break state is set to true.
 48 */
 49static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
 50{
 51	struct usb_serial_port *port = tty->driver_data;
 
 
 52	if (!break_state)
 53		return;
 54	usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
 
 
 
 
 
 55}
 56
 57static void usb_debug_read_bulk_callback(struct urb *urb)
 58{
 59	struct usb_serial_port *port = urb->context;
 60
 61	if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
 62	    memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
 63		   USB_DEBUG_BRK_SIZE) == 0) {
 64		usb_serial_handle_break(port);
 65		usb_serial_generic_submit_read_urb(port, GFP_ATOMIC);
 66		return;
 67	}
 68
 69	usb_serial_generic_read_bulk_callback(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	.usb_driver =		&debug_driver,
 79	.num_ports =		1,
 80	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,
 81	.break_ctl =		usb_debug_break_ctl,
 82	.read_bulk_callback =	usb_debug_read_bulk_callback,
 
 83};
 84
 85static int __init debug_init(void)
 86{
 87	int retval;
 88
 89	retval = usb_serial_register(&debug_device);
 90	if (retval)
 91		return retval;
 92	retval = usb_register(&debug_driver);
 93	if (retval)
 94		usb_serial_deregister(&debug_device);
 95	return retval;
 96}
 97
 98static void __exit debug_exit(void)
 99{
100	usb_deregister(&debug_driver);
101	usb_serial_deregister(&debug_device);
102}
103
104module_init(debug_init);
105module_exit(debug_exit);
106MODULE_LICENSE("GPL");

  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 int usb_debug_break_ctl(struct tty_struct *tty, int break_state)
 51{
 52	struct usb_serial_port *port = tty->driver_data;
 53	int ret;
 54
 55	if (!break_state)
 56		return 0;
 57
 58	ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
 59	if (ret < 0)
 60		return ret;
 61
 62	return 0;
 63}
 64
 65static void usb_debug_process_read_urb(struct urb *urb)
 66{
 67	struct usb_serial_port *port = urb->context;
 68
 69	if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
 70		memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
 71						USB_DEBUG_BRK_SIZE) == 0) {
 72		usb_serial_handle_break(port);
 
 73		return;
 74	}
 75
 76	usb_serial_generic_process_read_urb(urb);
 77}
 78
 79static void usb_debug_init_termios(struct tty_struct *tty)
 80{
 81	tty->termios.c_lflag &= ~(ECHO | ECHONL);
 82}
 83
 84static struct usb_serial_driver debug_device = {
 85	.driver = {
 
 86		.name =		"debug",
 87	},
 88	.id_table =		id_table,
 
 89	.num_ports =		1,
 90	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,
 91	.break_ctl =		usb_debug_break_ctl,
 92	.init_termios =		usb_debug_init_termios,
 93	.process_read_urb =	usb_debug_process_read_urb,
 94};
 95
 96static struct usb_serial_driver dbc_device = {
 97	.driver = {
 98		.name =		"xhci_dbc",
 99	},
100	.id_table =		dbc_id_table,
101	.num_ports =		1,
102	.break_ctl =		usb_debug_break_ctl,
103	.init_termios =		usb_debug_init_termios,
104	.process_read_urb =	usb_debug_process_read_urb,
105};
 
 
106
107static struct usb_serial_driver * const serial_drivers[] = {
108	&debug_device, &dbc_device, NULL
109};
 
 
110
111module_usb_serial_driver(serial_drivers, id_table_combined);
112MODULE_DESCRIPTION("USB Debug cable driver");
113MODULE_LICENSE("GPL v2");