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958e8741 GKH |
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 | ||
5a0e3ad6 | 11 | #include <linux/gfp.h> |
958e8741 GKH |
12 | #include <linux/kernel.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/tty.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/usb/serial.h> | |
18 | ||
71be4f81 | 19 | #define USB_DEBUG_MAX_PACKET_SIZE 8 |
98fcb5f7 JW |
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 | }; | |
71be4f81 | 31 | |
7d40d7e8 | 32 | static const struct usb_device_id id_table[] = { |
958e8741 GKH |
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, | |
e63aa508 | 43 | .no_dynamic_id = 1, |
958e8741 GKH |
44 | }; |
45 | ||
98fcb5f7 JW |
46 | /* This HW really does not support a serial break, so one will be |
47 | * emulated when ever the break state is set to true. | |
48 | */ | |
49 | static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) | |
50 | { | |
51 | struct usb_serial_port *port = tty->driver_data; | |
52 | if (!break_state) | |
53 | return; | |
54 | usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); | |
55 | } | |
56 | ||
ac3695fb | 57 | static void usb_debug_process_read_urb(struct urb *urb) |
98fcb5f7 JW |
58 | { |
59 | struct usb_serial_port *port = urb->context; | |
60 | ||
61 | if (urb->actual_length == USB_DEBUG_BRK_SIZE && | |
e63aa508 JH |
62 | memcmp(urb->transfer_buffer, USB_DEBUG_BRK, |
63 | USB_DEBUG_BRK_SIZE) == 0) { | |
98fcb5f7 | 64 | usb_serial_handle_break(port); |
98fcb5f7 JW |
65 | return; |
66 | } | |
67 | ||
ac3695fb | 68 | usb_serial_generic_process_read_urb(urb); |
98fcb5f7 JW |
69 | } |
70 | ||
958e8741 GKH |
71 | static struct usb_serial_driver debug_device = { |
72 | .driver = { | |
73 | .owner = THIS_MODULE, | |
74 | .name = "debug", | |
75 | }, | |
76 | .id_table = id_table, | |
5620b5f7 | 77 | .usb_driver = &debug_driver, |
958e8741 | 78 | .num_ports = 1, |
7288d755 | 79 | .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE, |
98fcb5f7 | 80 | .break_ctl = usb_debug_break_ctl, |
ac3695fb | 81 | .process_read_urb = usb_debug_process_read_urb, |
958e8741 GKH |
82 | }; |
83 | ||
84 | static int __init debug_init(void) | |
85 | { | |
86 | int retval; | |
87 | ||
88 | retval = usb_serial_register(&debug_device); | |
89 | if (retval) | |
90 | return retval; | |
91 | retval = usb_register(&debug_driver); | |
92 | if (retval) | |
93 | usb_serial_deregister(&debug_device); | |
94 | return retval; | |
95 | } | |
96 | ||
97 | static void __exit debug_exit(void) | |
98 | { | |
99 | usb_deregister(&debug_driver); | |
100 | usb_serial_deregister(&debug_device); | |
101 | } | |
102 | ||
103 | module_init(debug_init); | |
104 | module_exit(debug_exit); | |
105 | MODULE_LICENSE("GPL"); |