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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.

/*
* 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.
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <usbg/usbg.h>
#define VENDOR 0x1d6b
#define PRODUCT 0x0104
int remove_gadget(usbg_gadget *g)
{
int usbg_ret;
usbg_udc *u;
/* Check if gadget is enabled */
u = usbg_get_gadget_udc(g);
/* If gadget is enable we have to disable it first */
if (u) {
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(int argc, char **argv)
{
int usbg_ret;
int ret = -EINVAL;
usbg_state *s;
usbg_gadget *g;
struct usbg_gadget_attrs g_attrs;
char *cp;
int vendor = VENDOR, product = PRODUCT;
if (argc >= 2) {
cp = strchr(argv[1], ':');
if (!cp) {
ret = -EINVAL;
fprintf(stderr, "Usage: gadget-vid-pid-remove vid:pid\n");
goto out1;
}
*cp++ = 0;
if (*argv[1])
vendor = strtoul(argv[1], NULL, 16);
if (*cp)
product = strtoul(cp, NULL, 16);
}
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);
}
}
ret = 0;
out2:
usbg_cleanup(s);
out1:
return ret;
}
usbg_strerror
const char * usbg_strerror(usbg_error e)
Get the short description of error.
Definition usbg_error.c:123
usbg_rm_gadget
int usbg_rm_gadget(usbg_gadget *g, int opts)
Remove existing USB gadget.
Definition usbg.c:1350
usbg_get_gadget_attrs
int usbg_get_gadget_attrs(usbg_gadget *g, struct usbg_gadget_attrs *g_attrs)
Get the USB gadget strings.
Definition usbg.c:1578
usbg_get_next_gadget
usbg_gadget * usbg_get_next_gadget(usbg_gadget *g)
Get the next gadget on a list.
Definition usbg.c:2650
usbg_get_first_gadget
usbg_gadget * usbg_get_first_gadget(usbg_state *s)
Get first gadget in gadget list.
Definition usbg.c:2625
USBG_RM_RECURSE
#define USBG_RM_RECURSE
Additional option for usbg_rm_* functions.
Definition usbg.h:71
usbg_init
int usbg_init(const char *configfs_path, usbg_state **state)
Initialize the libusbgx library state.
Definition usbg.c:1091
usbg_get_gadget_udc
usbg_udc * usbg_get_gadget_udc(usbg_gadget *g)
Get udc to which gadget is bound.
Definition usbg.c:1648
usbg_cleanup
void usbg_cleanup(usbg_state *s)
Clean up the libusbgx library state.
Definition usbg.c:1136
usbg_disable_gadget
int usbg_disable_gadget(usbg_gadget *g)
Disable a USB gadget device.
Definition usbg.c:2576
usbg_error_name
const char * usbg_error_name(usbg_error e)
Get the error name as a constant string.
Definition usbg_error.c:62
usbg_gadget_attrs
USB gadget device attributes.
Definition usbg.h:135
usbg_gadget
Definition usbg_internal.h:103
usbg_state
Definition usbg_internal.h:93
usbg_udc
Definition usbg_internal.h:153
usbg.h