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 struct usb_serial_driver debug_device = {
 80	.driver = {
 81		.owner =	THIS_MODULE,
 82		.name =		"debug",
 83	},
 84	.id_table =		id_table,
 85	.num_ports =		1,
 86	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,
 87	.break_ctl =		usb_debug_break_ctl,
 88	.process_read_urb =	usb_debug_process_read_urb,
 89};
 90
 91static struct usb_serial_driver dbc_device = {
 92	.driver = {
 93		.owner =	THIS_MODULE,
 94		.name =		"xhci_dbc",
 95	},
 96	.id_table =		dbc_id_table,
 97	.num_ports =		1,
 98	.break_ctl =		usb_debug_break_ctl,
 99	.process_read_urb =	usb_debug_process_read_urb,
100};
101
102static struct usb_serial_driver * const serial_drivers[] = {
103	&debug_device, &dbc_device, NULL
104};
105
106module_usb_serial_driver(serial_drivers, id_table_combined);
107MODULE_LICENSE("GPL v2");

 
 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/tty.h>
14#include <linux/module.h>
15#include <linux/usb.h>
16#include <linux/usb/serial.h>
17
18#define USB_DEBUG_MAX_PACKET_SIZE	8
19#define USB_DEBUG_BRK_SIZE		8
20static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
21	0x00,
22	0xff,
23	0x01,
24	0xfe,
25	0x00,
26	0xfe,
27	0x01,
28	0xff,
29};
30
31static const struct usb_device_id id_table[] = {
32	{ USB_DEVICE(0x0525, 0x127a) },
33	{ },
34};
35MODULE_DEVICE_TABLE(usb, id_table);
 
 
 
 
 
 
 
 
 
 
 
 
 
36
37/* This HW really does not support a serial break, so one will be
38 * emulated when ever the break state is set to true.
39 */
40static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
41{
42	struct usb_serial_port *port = tty->driver_data;
 
 
43	if (!break_state)
44		return;
45	usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
 
 
 
 
 
46}
47
48static void usb_debug_process_read_urb(struct urb *urb)
49{
50	struct usb_serial_port *port = urb->context;
51
52	if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
53		memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
54						USB_DEBUG_BRK_SIZE) == 0) {
55		usb_serial_handle_break(port);
56		return;
57	}
58
59	usb_serial_generic_process_read_urb(urb);
60}
61
62static struct usb_serial_driver debug_device = {
63	.driver = {
64		.owner =	THIS_MODULE,
65		.name =		"debug",
66	},
67	.id_table =		id_table,
68	.num_ports =		1,
69	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,
70	.break_ctl =		usb_debug_break_ctl,
71	.process_read_urb =	usb_debug_process_read_urb,
72};
73
 
 
 
 
 
 
 
 
 
 
 
74static struct usb_serial_driver * const serial_drivers[] = {
75	&debug_device, NULL
76};
77
78module_usb_serial_driver(serial_drivers, id_table);
79MODULE_LICENSE("GPL");