Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 const 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};
35
36static const struct usb_device_id dbc_id_table[] = {
37 { USB_DEVICE(0x1d6b, 0x0004) },
38 { },
39};
40
41static const struct usb_device_id id_table_combined[] = {
42 { USB_DEVICE(0x0525, 0x127a) },
43 { USB_DEVICE(0x1d6b, 0x0004) },
44 { },
45};
46MODULE_DEVICE_TABLE(usb, id_table_combined);
47
48/* This HW really does not support a serial break, so one will be
49 * emulated when ever the break state is set to true.
50 */
51static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
52{
53 struct usb_serial_port *port = tty->driver_data;
54 if (!break_state)
55 return;
56 usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
57}
58
59static void usb_debug_process_read_urb(struct urb *urb)
60{
61 struct usb_serial_port *port = urb->context;
62
63 if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
64 memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
65 USB_DEBUG_BRK_SIZE) == 0) {
66 usb_serial_handle_break(port);
67 return;
68 }
69
70 usb_serial_generic_process_read_urb(urb);
71}
72
73static struct usb_serial_driver debug_device = {
74 .driver = {
75 .owner = THIS_MODULE,
76 .name = "debug",
77 },
78 .id_table = id_table,
79 .num_ports = 1,
80 .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
81 .break_ctl = usb_debug_break_ctl,
82 .process_read_urb = usb_debug_process_read_urb,
83};
84
85static struct usb_serial_driver dbc_device = {
86 .driver = {
87 .owner = THIS_MODULE,
88 .name = "xhci_dbc",
89 },
90 .id_table = dbc_id_table,
91 .num_ports = 1,
92 .break_ctl = usb_debug_break_ctl,
93 .process_read_urb = usb_debug_process_read_urb,
94};
95
96static struct usb_serial_driver * const serial_drivers[] = {
97 &debug_device, &dbc_device, NULL
98};
99
100module_usb_serial_driver(serial_drivers, id_table_combined);
101MODULE_LICENSE("GPL");