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
|
/* Low level USB code to access DPF.
*
* (c) 2010, 2011 <hackfin@section5.ch>
*
* This currently uses the SCSI command set
*
* The reason for this is that we want to access the hacked frame
* non-root and without having to wait for the SCSI interface to
* intialize.
*
* Later, we'll replace the SCSI command stuff.
*/
#include "dpf.h"
#include "sglib.h"
#include <string.h>
#include <stdio.h>
#define ENDPT_OUT 1
#define ENDPT_IN 0x81
struct known_device {
char *desc;
unsigned short vid;
unsigned short pid;
} g_known_devices[] = {
{ "AX206 DPF", 0x1908, 0x0102 },
{ 0 , 0, 0 } /* NEVER REMOVE THIS */
};
int handle_error(char *txt)
{
fprintf(stderr, "Error: %s\n", txt);
return -1;
}
void usb_flush(usb_dev_handle *dev)
{
char buf[20];
usb_bulk_read(dev, ENDPT_IN, buf, 3, 1000);
}
int check_known_device(struct usb_device *d)
{
struct known_device *dev = g_known_devices;
while (dev->desc) {
if ((d->descriptor.idVendor == dev->vid) &&
(d->descriptor.idProduct == dev->pid)) {
fprintf(stderr, "Found %s\n", dev->desc);
return 1;
}
dev++;
}
return 0;
}
static struct usb_device *find_dev(int index)
{
struct usb_bus *b;
struct usb_device *d;
int enumeration = 0;
b = usb_get_busses();
while (b) {
d = b->devices;
while (d) {
if (check_known_device(d)) {
if (enumeration == index) return d;
else enumeration++;
}
#ifdef DEBUG
printf("%04x %04x\n",
d->descriptor.idVendor,
d->descriptor.idProduct);
#endif
d = d->next;
}
b = b->next;
}
return NULL;
}
char g_buf[] = {
0x55, 0x53, 0x42, 0x43, // dCBWSignature
0xde, 0xad, 0xbe, 0xef, // dCBWTag
0x00, 0x80, 0x00, 0x00, // dCBWLength
0x00, // bmCBWFlags: 0x80: data in (dev to host), 0x00: Data out
0x00, // bCBWLUN
0x10, // bCBWCBLength
// SCSI cmd:
0xcd, 0x00, 0x00, 0x00,
0x00, 0x06, 0x11, 0xf8,
0x70, 0x00, 0x40, 0x00,
0x00, 0x00, 0x00, 0x00,
};
int emulate_scsi(usb_dev_handle *dev, unsigned char *cmd, int cmdlen, char out,
unsigned char *data, unsigned long block_len)
{
int len;
int ret;
static unsigned char ansbuf[13]; // Do not change size.
g_buf[14] = cmdlen;
memcpy(&g_buf[15], cmd, cmdlen);
g_buf[8] = block_len;
g_buf[9] = block_len >> 8;
g_buf[10] = block_len >> 16;
g_buf[11] = block_len >> 24;
ret = usb_bulk_write(dev, ENDPT_OUT, g_buf, sizeof(g_buf), 1000);
if (ret < 0) return ret;
if (out == DIR_OUT) {
if (data) {
ret = usb_bulk_write(dev, ENDPT_OUT, (const char* )data,
block_len, 3000);
if (ret != block_len) {
perror("bulk write");
return ret;
}
}
} else if (data) {
ret = usb_bulk_read(dev, ENDPT_IN, (char *) data, block_len, 4000);
if (ret != block_len) {
perror("bulk data read");
}
}
// get ACK:
len = sizeof(ansbuf);
int retry = 0;
do {
ret = usb_bulk_read(dev, ENDPT_IN, (char *) ansbuf, len, 5000);
if (ret != len) {
perror("bulk ACK read");
ret = DEVERR_TIMEOUT;
}
retry++;
} while (ret == DEVERR_TIMEOUT && retry < 5);
if (strncmp((char *) ansbuf, "USBS", 4)) {
return handle_error("Got invalid reply\n");
}
// pass back return code set by peer:
return ansbuf[12];
}
usb_dev_handle *dpf_usb_open(int index)
{
struct usb_device *d;
usb_dev_handle *usb_dev;
usb_init();
usb_find_busses();
usb_find_devices();
d = find_dev(index);
if (!d) {
handle_error("No matching USB device found!");
return NULL;
}
usb_dev = usb_open(d);
if (usb_dev == NULL) {
handle_error("Failed to open usb device!");
return NULL;
}
usb_claim_interface(usb_dev, 0);
return usb_dev;
}
|
