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// SPDX-License-Identifier: GPL-2.0
/*
* USB Debug cable driver
*
* Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
*/
#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 8
static 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, 0x0010) },
{ USB_DEVICE(0x1d6b, 0x0011) },
{ },
};
static const struct usb_device_id id_table_combined[] = {
{ USB_DEVICE(0x0525, 0x127a) },
{ USB_DEVICE(0x1d6b, 0x0010) },
{ USB_DEVICE(0x1d6b, 0x0011) },
{ },
};
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 int usb_debug_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
int ret;
if (!break_state)
return 0;
ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
if (ret < 0)
return ret;
return 0;
}
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 void usb_debug_init_termios(struct tty_struct *tty)
{
tty->termios.c_lflag &= ~(ECHO | ECHONL);
}
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,
.init_termios = usb_debug_init_termios,
.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,
.init_termios = usb_debug_init_termios,
.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_DESCRIPTION("USB Debug cable driver");
MODULE_LICENSE("GPL v2");
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