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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, 0x0011) },
35 { },
36};
37
38static const struct usb_device_id id_table_combined[] = {
39 { USB_DEVICE(0x0525, 0x127a) },
40 { USB_DEVICE(0x1d6b, 0x0011) },
41 { },
42};
43MODULE_DEVICE_TABLE(usb, id_table_combined);
44
45/* This HW really does not support a serial break, so one will be
46 * emulated when ever the break state is set to true.
47 */
48static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
49{
50 struct usb_serial_port *port = tty->driver_data;
51 if (!break_state)
52 return;
53 usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
54}
55
56static void usb_debug_process_read_urb(struct urb *urb)
57{
58 struct usb_serial_port *port = urb->context;
59
60 if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
61 memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
62 USB_DEBUG_BRK_SIZE) == 0) {
63 usb_serial_handle_break(port);
64 return;
65 }
66
67 usb_serial_generic_process_read_urb(urb);
68}
69
70static struct usb_serial_driver debug_device = {
71 .driver = {
72 .owner = THIS_MODULE,
73 .name = "debug",
74 },
75 .id_table = id_table,
76 .num_ports = 1,
77 .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
78 .break_ctl = usb_debug_break_ctl,
79 .process_read_urb = usb_debug_process_read_urb,
80};
81
82static struct usb_serial_driver dbc_device = {
83 .driver = {
84 .owner = THIS_MODULE,
85 .name = "xhci_dbc",
86 },
87 .id_table = dbc_id_table,
88 .num_ports = 1,
89 .break_ctl = usb_debug_break_ctl,
90 .process_read_urb = usb_debug_process_read_urb,
91};
92
93static struct usb_serial_driver * const serial_drivers[] = {
94 &debug_device, &dbc_device, NULL
95};
96
97module_usb_serial_driver(serial_drivers, id_table_combined);
98MODULE_LICENSE("GPL v2");