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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/kernel.h> | |
12 | #include <linux/init.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 URB_DEBUG_MAX_IN_FLIGHT_URBS 4000 | |
19 | #define USB_DEBUG_MAX_PACKET_SIZE 8 | |
20 | #define USB_DEBUG_BRK_SIZE 8 | |
21 | static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = { | |
22 | 0x00, | |
23 | 0xff, | |
24 | 0x01, | |
25 | 0xfe, | |
26 | 0x00, | |
27 | 0xfe, | |
28 | 0x01, | |
29 | 0xff, | |
30 | }; | |
31 | ||
32 | static struct usb_device_id id_table [] = { | |
33 | { USB_DEVICE(0x0525, 0x127a) }, | |
34 | { }, | |
35 | }; | |
36 | MODULE_DEVICE_TABLE(usb, id_table); | |
37 | ||
38 | static struct usb_driver debug_driver = { | |
39 | .name = "debug", | |
40 | .probe = usb_serial_probe, | |
41 | .disconnect = usb_serial_disconnect, | |
42 | .id_table = id_table, | |
43 | .no_dynamic_id = 1, | |
44 | }; | |
45 | ||
46 | static int usb_debug_open(struct tty_struct *tty, struct usb_serial_port *port) | |
47 | { | |
48 | port->bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE; | |
49 | return usb_serial_generic_open(tty, port); | |
50 | } | |
51 | ||
52 | /* This HW really does not support a serial break, so one will be | |
53 | * emulated when ever the break state is set to true. | |
54 | */ | |
55 | static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) | |
56 | { | |
57 | struct usb_serial_port *port = tty->driver_data; | |
58 | if (!break_state) | |
59 | return; | |
60 | usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); | |
61 | } | |
62 | ||
63 | static void usb_debug_read_bulk_callback(struct urb *urb) | |
64 | { | |
65 | struct usb_serial_port *port = urb->context; | |
66 | ||
67 | if (urb->actual_length == USB_DEBUG_BRK_SIZE && | |
68 | memcmp(urb->transfer_buffer, USB_DEBUG_BRK, | |
69 | USB_DEBUG_BRK_SIZE) == 0) { | |
70 | usb_serial_handle_break(port); | |
71 | usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC); | |
72 | return; | |
73 | } | |
74 | ||
75 | usb_serial_generic_read_bulk_callback(urb); | |
76 | } | |
77 | ||
78 | static struct usb_serial_driver debug_device = { | |
79 | .driver = { | |
80 | .owner = THIS_MODULE, | |
81 | .name = "debug", | |
82 | }, | |
83 | .id_table = id_table, | |
84 | .num_ports = 1, | |
85 | .open = usb_debug_open, | |
86 | .max_in_flight_urbs = URB_DEBUG_MAX_IN_FLIGHT_URBS, | |
87 | .break_ctl = usb_debug_break_ctl, | |
88 | .read_bulk_callback = usb_debug_read_bulk_callback, | |
89 | }; | |
90 | ||
91 | static int __init debug_init(void) | |
92 | { | |
93 | int retval; | |
94 | ||
95 | retval = usb_serial_register(&debug_device); | |
96 | if (retval) | |
97 | return retval; | |
98 | retval = usb_register(&debug_driver); | |
99 | if (retval) | |
100 | usb_serial_deregister(&debug_device); | |
101 | return retval; | |
102 | } | |
103 | ||
104 | static void __exit debug_exit(void) | |
105 | { | |
106 | usb_deregister(&debug_driver); | |
107 | usb_serial_deregister(&debug_device); | |
108 | } | |
109 | ||
110 | module_init(debug_init); | |
111 | module_exit(debug_exit); | |
112 | MODULE_LICENSE("GPL"); |