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
20 static 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
31 static const struct usb_device_id id_table[] = {
32 { USB_DEVICE(0x0525, 0x127a) },
33 { },
34 };
35
36 static const struct usb_device_id dbc_id_table[] = {
37 { USB_DEVICE(0x1d6b, 0x0010) },
38 { USB_DEVICE(0x1d6b, 0x0011) },
39 { },
40 };
41
42 static const struct usb_device_id id_table_combined[] = {
43 { USB_DEVICE(0x0525, 0x127a) },
44 { USB_DEVICE(0x1d6b, 0x0010) },
45 { USB_DEVICE(0x1d6b, 0x0011) },
46 { },
47 };
48 MODULE_DEVICE_TABLE(usb, id_table_combined);
49
50 /* This HW really does not support a serial break, so one will be
51 * emulated when ever the break state is set to true.
52 */
usb_debug_break_ctl(struct tty_struct * tty,int break_state)53 static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
54 {
55 struct usb_serial_port *port = tty->driver_data;
56 if (!break_state)
57 return;
58 usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
59 }
60
usb_debug_process_read_urb(struct urb * urb)61 static void usb_debug_process_read_urb(struct urb *urb)
62 {
63 struct usb_serial_port *port = urb->context;
64
65 if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
66 memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
67 USB_DEBUG_BRK_SIZE) == 0) {
68 usb_serial_handle_break(port);
69 return;
70 }
71
72 usb_serial_generic_process_read_urb(urb);
73 }
74
75 static struct usb_serial_driver debug_device = {
76 .driver = {
77 .owner = THIS_MODULE,
78 .name = "debug",
79 },
80 .id_table = id_table,
81 .num_ports = 1,
82 .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
83 .break_ctl = usb_debug_break_ctl,
84 .process_read_urb = usb_debug_process_read_urb,
85 };
86
87 static struct usb_serial_driver dbc_device = {
88 .driver = {
89 .owner = THIS_MODULE,
90 .name = "xhci_dbc",
91 },
92 .id_table = dbc_id_table,
93 .num_ports = 1,
94 .break_ctl = usb_debug_break_ctl,
95 .process_read_urb = usb_debug_process_read_urb,
96 };
97
98 static struct usb_serial_driver * const serial_drivers[] = {
99 &debug_device, &dbc_device, NULL
100 };
101
102 module_usb_serial_driver(serial_drivers, id_table_combined);
103 MODULE_LICENSE("GPL");
104