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
|
/*
* Copyright (C) 2014 Samsung Electronics
*
* Krzysztof Opasiak <k.opasiak@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/**
* @file gadget-vid-pid-remove.c
* @example gadget-vid-pid-remove.c
* This is an example of how to find and remove an gadget device with given
* Vendor ID and product ID.
*/
#include <errno.h>
#include <stdio.h>
#include <usbg/usbg.h>
#define VENDOR 0x1d6b
#define PRODUCT 0x0104
int remove_gadget(usbg_gadget *g)
{
int usbg_ret;
char udc[USBG_MAX_STR_LENGTH];
/* Check if gadget is enabled */
usbg_ret = usbg_get_gadget_udc(g, udc, USBG_MAX_STR_LENGTH);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB get gadget udc\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out;
}
/* If gadget is enable we have to disable it first */
if (udc[0] != '\0') {
usbg_ret = usbg_disable_gadget(g);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB disable gadget udc\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out;
}
}
/* Remove gadget with USBG_RM_RECURSE flag to remove
* also its configurations, functions and strings */
usbg_ret = usbg_rm_gadget(g, USBG_RM_RECURSE);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB gadget remove\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
}
out:
return usbg_ret;
}
int main(void)
{
int usbg_ret;
int ret = -EINVAL;
usbg_state *s;
usbg_gadget *g;
usbg_gadget_attrs g_attrs;
usbg_ret = usbg_init("/sys/kernel/config", &s);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB state init\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out1;
}
g = usbg_get_first_gadget(s);
while (g != NULL) {
/* Get current gadget attrs to be compared */
usbg_ret = usbg_get_gadget_attrs(g, &g_attrs);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB get gadget attrs\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
/* Compare attrs with given values and remove if suitable */
if (g_attrs.idVendor == VENDOR && g_attrs.idProduct == PRODUCT) {
usbg_gadget *g_next = usbg_get_next_gadget(g);
usbg_ret = remove_gadget(g);
if (usbg_ret != USBG_SUCCESS)
goto out2;
g = g_next;
} else {
g = usbg_get_next_gadget(g);
}
}
out2:
usbg_cleanup(s);
out1:
return ret;
}
|
