/* * USB Debug cable driver * * Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com> * *	This program is free software; you can redistribute it and/or *	modify it under the terms of the GNU General Public License version *	2 as published by the Free Software Foundation. */ #include <linux/gfp.h>#include <linux/kernel.h>#include <linux/tty.h>#include <linux/module.h>#include <linux/usb.h>#include <linux/usb/serial.h> #define USB_DEBUG_MAX_PACKET_SIZE	8#define USB_DEBUG_BRK_SIZE		8static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {	0x00,	0xff,	0x01,	0xfe,	0x00,	0xfe,	0x01,	0xff,}; static const struct usb_device_id id_table[] = {	{ USB_DEVICE(0x0525, 0x127a) },	{ },}; static const struct usb_device_id dbc_id_table[] = {	{ USB_DEVICE(0x1d6b, 0x0004) },	{ },}; static const struct usb_device_id id_table_combined[] = {	{ USB_DEVICE(0x0525, 0x127a) },	{ USB_DEVICE(0x1d6b, 0x0004) },	{ },};MODULE_DEVICE_TABLE(usb, id_table_combined); /* This HW really does not support a serial break, so one will be * emulated when ever the break state is set to true. */static void usb_debug_break_ctl(struct tty_struct *tty, int break_state){	struct usb_serial_port *port = tty->driver_data;	if (!break_state)		return;	usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);} static void usb_debug_process_read_urb(struct urb *urb){	struct usb_serial_port *port = urb->context; 	if (urb->actual_length == USB_DEBUG_BRK_SIZE &&		memcmp(urb->transfer_buffer, USB_DEBUG_BRK,						USB_DEBUG_BRK_SIZE) == 0) {		usb_serial_handle_break(port);		return;	} 	usb_serial_generic_process_read_urb(urb);} static struct usb_serial_driver debug_device = {	.driver = {		.owner =	THIS_MODULE,		.name =		"debug",	},	.id_table =		id_table,	.num_ports =		1,	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,	.break_ctl =		usb_debug_break_ctl,	.process_read_urb =	usb_debug_process_read_urb,}; static struct usb_serial_driver dbc_device = {	.driver = {		.owner =	THIS_MODULE,		.name =		"xhci_dbc",	},	.id_table =		dbc_id_table,	.num_ports =		1,	.break_ctl =		usb_debug_break_ctl,	.process_read_urb =	usb_debug_process_read_urb,}; static struct usb_serial_driver * const serial_drivers[] = {	&debug_device, &dbc_device, NULL}; module_usb_serial_driver(serial_drivers, id_table_combined);MODULE_LICENSE("GPL");