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/* SPDX-License-Identifier: GPL-2.0 */
/*
* u_ether_configfs.h
*
* Utility definitions for configfs support in USB Ethernet functions
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef __U_ETHER_CONFIGFS_H
#define __U_ETHER_CONFIGFS_H
#define USB_ETHERNET_CONFIGFS_ITEM(_f_) \
static void _f_##_attr_release(struct config_item *item) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
usb_put_function_instance(&opts->func_inst); \
} \
\
static struct configfs_item_operations _f_##_item_ops = { \
.release = _f_##_attr_release, \
}
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(_f_) \
static ssize_t _f_##_opts_dev_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = gether_get_dev_addr(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t _f_##_opts_dev_addr_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
mutex_unlock(&opts->lock); \
return -EBUSY; \
} \
\
ret = gether_set_dev_addr(opts->net, page); \
mutex_unlock(&opts->lock); \
if (!ret) \
ret = len; \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, dev_addr)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(_f_) \
static ssize_t _f_##_opts_host_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = gether_get_host_addr(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t _f_##_opts_host_addr_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
mutex_unlock(&opts->lock); \
return -EBUSY; \
} \
\
ret = gether_set_host_addr(opts->net, page); \
mutex_unlock(&opts->lock); \
if (!ret) \
ret = len; \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, host_addr)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(_f_) \
static ssize_t _f_##_opts_qmult_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
unsigned qmult; \
\
mutex_lock(&opts->lock); \
qmult = gether_get_qmult(opts->net); \
mutex_unlock(&opts->lock); \
return sprintf(page, "%d\n", qmult); \
} \
\
static ssize_t _f_##_opts_qmult_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
u8 val; \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto out; \
} \
\
ret = kstrtou8(page, 0, &val); \
if (ret) \
goto out; \
\
gether_set_qmult(opts->net, val); \
ret = len; \
out: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, qmult)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(_f_) \
static ssize_t _f_##_opts_ifname_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
ret = gether_get_ifname(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
static ssize_t _f_##_opts_ifname_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret = -EBUSY; \
\
mutex_lock(&opts->lock); \
if (!opts->refcnt) \
ret = gether_set_ifname(opts->net, page, len); \
mutex_unlock(&opts->lock); \
return ret ?: len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, ifname)
#define USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(_f_, _n_) \
static ssize_t _f_##_opts_##_n_##_show(struct config_item *item,\
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
ret = sprintf(page, "%02x\n", opts->_n_); \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
static ssize_t _f_##_opts_##_n_##_store(struct config_item *item,\
const char *page, \
size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret = -EINVAL; \
u8 val; \
\
mutex_lock(&opts->lock); \
if (sscanf(page, "%02hhx", &val) > 0) { \
opts->_n_ = val; \
ret = len; \
} \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, _n_)
#endif /* __U_ETHER_CONFIGFS_H */
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