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 |
17 | static 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 | |
28 | static const struct usb_device_id id_table[] = { |
29 | { USB_DEVICE(0x0525, 0x127a) }, |
30 | { }, |
31 | }; |
32 | |
33 | static const struct usb_device_id dbc_id_table[] = { |
34 | { USB_DEVICE(0x1d6b, 0x0010) }, |
35 | { USB_DEVICE(0x1d6b, 0x0011) }, |
36 | { }, |
37 | }; |
38 | |
39 | static const struct usb_device_id id_table_combined[] = { |
40 | { USB_DEVICE(0x0525, 0x127a) }, |
41 | { USB_DEVICE(0x1d6b, 0x0010) }, |
42 | { USB_DEVICE(0x1d6b, 0x0011) }, |
43 | { }, |
44 | }; |
45 | MODULE_DEVICE_TABLE(usb, id_table_combined); |
46 | |
47 | /* This HW really does not support a serial break, so one will be |
48 | * emulated when ever the break state is set to true. |
49 | */ |
50 | static int usb_debug_break_ctl(struct tty_struct *tty, int break_state) |
51 | { |
52 | struct usb_serial_port *port = tty->driver_data; |
53 | int ret; |
54 | |
55 | if (!break_state) |
56 | return 0; |
57 | |
58 | ret = usb_serial_generic_write(tty, port, buf: USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); |
59 | if (ret < 0) |
60 | return ret; |
61 | |
62 | return 0; |
63 | } |
64 | |
65 | static void usb_debug_process_read_urb(struct urb *urb) |
66 | { |
67 | struct usb_serial_port *port = urb->context; |
68 | |
69 | if (urb->actual_length == USB_DEBUG_BRK_SIZE && |
70 | memcmp(p: urb->transfer_buffer, q: USB_DEBUG_BRK, |
71 | USB_DEBUG_BRK_SIZE) == 0) { |
72 | usb_serial_handle_break(port); |
73 | return; |
74 | } |
75 | |
76 | usb_serial_generic_process_read_urb(urb); |
77 | } |
78 | |
79 | static struct usb_serial_driver debug_device = { |
80 | .driver = { |
81 | .owner = THIS_MODULE, |
82 | .name = "debug" , |
83 | }, |
84 | .id_table = id_table, |
85 | .num_ports = 1, |
86 | .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE, |
87 | .break_ctl = usb_debug_break_ctl, |
88 | .process_read_urb = usb_debug_process_read_urb, |
89 | }; |
90 | |
91 | static struct usb_serial_driver dbc_device = { |
92 | .driver = { |
93 | .owner = THIS_MODULE, |
94 | .name = "xhci_dbc" , |
95 | }, |
96 | .id_table = dbc_id_table, |
97 | .num_ports = 1, |
98 | .break_ctl = usb_debug_break_ctl, |
99 | .process_read_urb = usb_debug_process_read_urb, |
100 | }; |
101 | |
102 | static struct usb_serial_driver * const serial_drivers[] = { |
103 | &debug_device, &dbc_device, NULL |
104 | }; |
105 | |
106 | module_usb_serial_driver(serial_drivers, id_table_combined); |
107 | MODULE_LICENSE("GPL v2" ); |
108 | |