1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// SPDX-License-Identifier: GPL-2.0
/*
* USB ZyXEL omni.net LCD PLUS driver
*
* Copyright (C) 2013,2017 Johan Hovold <johan@kernel.org>
*
* See Documentation/usb/usb-serial.rst for more information on using this
* driver
*
* Please report both successes and troubles to the author at omninet@kroah.com
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#define DRIVER_AUTHOR "Alessandro Zummo"
#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
#define ZYXEL_VENDOR_ID 0x0586
#define ZYXEL_OMNINET_ID 0x1000
/* This one seems to be a re-branded ZyXEL device */
#define BT_IGNITIONPRO_ID 0x2000
/* function prototypes */
static void omninet_process_read_urb(struct urb *urb);
static int omninet_prepare_write_buffer(struct usb_serial_port *port,
void *buf, size_t count);
static int omninet_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds);
static int omninet_port_probe(struct usb_serial_port *port);
static int omninet_port_remove(struct usb_serial_port *port);
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_serial_driver zyxel_omninet_device = {
.driver = {
.owner = THIS_MODULE,
.name = "omninet",
},
.description = "ZyXEL - omni.net lcd plus usb",
.id_table = id_table,
.num_bulk_out = 2,
.calc_num_ports = omninet_calc_num_ports,
.port_probe = omninet_port_probe,
.port_remove = omninet_port_remove,
.process_read_urb = omninet_process_read_urb,
.prepare_write_buffer = omninet_prepare_write_buffer,
};
static struct usb_serial_driver * const serial_drivers[] = {
&zyxel_omninet_device, NULL
};
/*
* The protocol.
*
* The omni.net always exchange 64 bytes of data with the host. The first
* four bytes are the control header.
*
* oh_seq is a sequence number. Don't know if/how it's used.
* oh_len is the length of the data bytes in the packet.
* oh_xxx Bit-mapped, related to handshaking and status info.
* I normally set it to 0x03 in transmitted frames.
* 7: Active when the TA is in a CONNECTed state.
* 6: unknown
* 5: handshaking, unknown
* 4: handshaking, unknown
* 3: unknown, usually 0
* 2: unknown, usually 0
* 1: handshaking, unknown, usually set to 1 in transmitted frames
* 0: handshaking, unknown, usually set to 1 in transmitted frames
* oh_pad Probably a pad byte.
*
* After the header you will find data bytes if oh_len was greater than zero.
*/
struct omninet_header {
__u8 oh_seq;
__u8 oh_len;
__u8 oh_xxx;
__u8 oh_pad;
};
struct omninet_data {
__u8 od_outseq; /* Sequence number for bulk_out URBs */
};
static int omninet_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
/* We need only the second bulk-out for our single-port device. */
epds->bulk_out[0] = epds->bulk_out[1];
epds->num_bulk_out = 1;
return 1;
}
static int omninet_port_probe(struct usb_serial_port *port)
{
struct omninet_data *od;
od = kzalloc(sizeof(*od), GFP_KERNEL);
if (!od)
return -ENOMEM;
usb_set_serial_port_data(port, od);
return 0;
}
static int omninet_port_remove(struct usb_serial_port *port)
{
struct omninet_data *od;
od = usb_get_serial_port_data(port);
kfree(od);
return 0;
}
#define OMNINET_HEADERLEN 4
#define OMNINET_BULKOUTSIZE 64
#define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN)
static void omninet_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
const struct omninet_header *hdr = urb->transfer_buffer;
const unsigned char *data;
size_t data_len;
if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len)
return;
data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN;
data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN,
hdr->oh_len);
tty_insert_flip_string(&port->port, data, data_len);
tty_flip_buffer_push(&port->port);
}
static int omninet_prepare_write_buffer(struct usb_serial_port *port,
void *buf, size_t count)
{
struct omninet_data *od = usb_get_serial_port_data(port);
struct omninet_header *header = buf;
count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
count, &port->lock);
header->oh_seq = od->od_outseq++;
header->oh_len = count;
header->oh_xxx = 0x03;
header->oh_pad = 0x00;
/* always 64 bytes */
return OMNINET_BULKOUTSIZE;
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
|
