/* * 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/init.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 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) },	{ },};MODULE_DEVICE_TABLE(usb, id_table); static struct usb_driver debug_driver = {	.name =		"debug",	.probe =	usb_serial_probe,	.disconnect =	usb_serial_disconnect,	.id_table =	id_table,	.no_dynamic_id = 	1,}; /* 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_read_bulk_callback(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);		usb_serial_generic_submit_read_urb(port, GFP_ATOMIC);		return;	} 	usb_serial_generic_read_bulk_callback(urb);} static struct usb_serial_driver debug_device = {	.driver = {		.owner =	THIS_MODULE,		.name =		"debug",	},	.id_table =		id_table,	.usb_driver =		&debug_driver,	.num_ports =		1,	.bulk_out_size =	USB_DEBUG_MAX_PACKET_SIZE,	.break_ctl =		usb_debug_break_ctl,	.read_bulk_callback =	usb_debug_read_bulk_callback,}; static int __init debug_init(void){	int retval; 	retval = usb_serial_register(&debug_device);	if (retval)		return retval;	retval = usb_register(&debug_driver);	if (retval)		usb_serial_deregister(&debug_device);	return retval;} static void __exit debug_exit(void){	usb_deregister(&debug_driver);	usb_serial_deregister(&debug_device);} module_init(debug_init);module_exit(debug_exit);MODULE_LICENSE("GPL");