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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*/
#include "usbg/usbg.h"
#include "usbg/usbg_internal.h"
#include "usbg/function/loopback.h"
#ifdef HAS_GADGET_SCHEMES
#include <libconfig.h>
#endif
struct usbg_f_loopback {
struct usbg_function func;
};
static const char *loopback_attr_names[USBG_F_LOOPBACK_ATTR_MAX] = {
[USBG_F_LOOPBACK_BUFLEN] = "buflen",
[USBG_F_LOOPBACK_QLEN] = "qlen",
};
static size_t loopback_offsets[USBG_F_LOOPBACK_ATTR_MAX] = {
[USBG_F_LOOPBACK_BUFLEN] = offsetof(struct usbg_f_loopback_attrs,
buflen),
[USBG_F_LOOPBACK_QLEN] = offsetof(struct usbg_f_loopback_attrs, qlen),
};
GENERIC_ALLOC_INST(loopback, struct usbg_f_loopback, func);
GENERIC_FREE_INST(loopback, struct usbg_f_loopback, func);
static int loopback_set_attrs(struct usbg_function *f, void *f_attrs)
{
return usbg_f_loopback_set_attrs(usbg_to_loopback_function(f), f_attrs);
}
static int loopback_get_attrs(struct usbg_function *f, void *f_attrs)
{
return usbg_f_loopback_get_attrs(usbg_to_loopback_function(f), f_attrs);
}
#ifdef HAS_GADGET_SCHEMES
static int loopback_libconfig_export(struct usbg_function *f,
config_setting_t *root)
{
struct usbg_f_loopback *lf = usbg_to_loopback_function(f);
config_setting_t *node;
int i, tmp, cfg_ret;
int ret = 0;
for (i = USBG_F_LOOPBACK_ATTR_MIN; i < USBG_F_LOOPBACK_ATTR_MAX; ++i) {
ret = usbg_f_loopback_get_attr_val(lf, i, &tmp);
if (ret)
break;
if (tmp < 0) {
ret = USBG_ERROR_INVALID_VALUE;
break;
}
node = config_setting_add(root, loopback_attr_names[i],
CONFIG_TYPE_INT);
if (!node) {
ret = USBG_ERROR_NO_MEM;
break;
}
cfg_ret = config_setting_set_int(node, tmp);
if (cfg_ret != CONFIG_TRUE) {
ret = USBG_ERROR_OTHER_ERROR;
break;
}
}
return ret;
}
static int loopback_libconfig_import(struct usbg_function *f,
config_setting_t *root)
{
struct usbg_f_loopback *lf = usbg_to_loopback_function(f);
config_setting_t *node;
int i, tmp;
int ret = 0;
for (i = USBG_F_LOOPBACK_ATTR_MIN; i < USBG_F_LOOPBACK_ATTR_MAX; ++i) {
node = config_setting_get_member(root, loopback_attr_names[i]);
if (!node)
continue;
tmp = config_setting_get_int(node);
if (tmp < 0) {
ret = USBG_ERROR_INVALID_PARAM;
break;
}
ret = usbg_f_loopback_set_attr_val(lf, i, tmp);
if (ret)
break;
}
return ret;
}
#endif /* HAS_GADGET_SCHEMES */
struct usbg_function_type usbg_f_type_loopback = {
.name = "Loopback",
.alloc_inst = loopback_alloc_inst,
.free_inst = loopback_free_inst,
.set_attrs = loopback_set_attrs,
.get_attrs = loopback_get_attrs,
#ifdef HAS_GADGET_SCHEMES
.import = loopback_libconfig_import,
.export = loopback_libconfig_export,
#endif
};
/* API implementation */
usbg_f_loopback *usbg_to_loopback_function(usbg_function *f)
{
return f->ops == &usbg_f_type_loopback ?
container_of(f, struct usbg_f_loopback, func) : NULL;
}
usbg_function *usbg_from_loopback_function(usbg_f_loopback *lf)
{
return &lf->func;
}
int usbg_f_loopback_get_attrs(usbg_f_loopback *lf,
struct usbg_f_loopback_attrs *attrs)
{
int i;
int ret = 0;
for (i = USBG_F_LOOPBACK_ATTR_MIN; i < USBG_F_LOOPBACK_ATTR_MAX; ++i) {
ret = usbg_f_loopback_get_attr_val(lf,
i,
(int *)((char *)attrs
+ loopback_offsets[i]));
if (ret)
break;
}
return ret;
}
int usbg_f_loopback_set_attrs(usbg_f_loopback *lf,
const struct usbg_f_loopback_attrs *attrs)
{
int i;
int ret;
for (i = USBG_F_LOOPBACK_ATTR_MIN; i < USBG_F_LOOPBACK_ATTR_MAX; ++i) {
ret = usbg_f_loopback_set_attr_val(lf,
i,
*(int *)((char *)attrs
+ loopback_offsets[i]));
if (ret)
break;
}
return ret;
}
int usbg_f_loopback_get_attr_val(usbg_f_loopback *lf,
enum usbg_f_loopback_attr attr, int *val)
{
return usbg_read_dec(lf->func.path, lf->func.name,
loopback_attr_names[attr], val);
}
int usbg_f_loopback_set_attr_val(usbg_f_loopback *lf,
enum usbg_f_loopback_attr attr, int val)
{
return usbg_write_dec(lf->func.path, lf->func.name,
loopback_attr_names[attr], val);
}
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