124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "los_random.h"
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#include "fcntl.h"
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#include "hisoc/random.h"
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#include "linux/kernel.h"
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#include "fs/driver.h"
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static RandomOperations g_randomOp;
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void RandomOperationsInit(const RandomOperations *r)
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{
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if (r != NULL) {
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(void)memcpy_s(&g_randomOp, sizeof(RandomOperations), r, sizeof(RandomOperations));
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} else {
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PRINT_ERR("%s %d param is invalid\n", __FUNCTION__, __LINE__);
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}
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return;
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}
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static int RandomHwOpen(struct file *filep)
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{
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if (g_randomOp.init != NULL) {
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g_randomOp.init();
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return ENOERR;
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}
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return -1;
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}
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static int RandomHwClose(struct file *filep)
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{
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if (g_randomOp.deinit != NULL) {
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g_randomOp.deinit();
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return ENOERR;
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}
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return -1;
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}
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static int RandomHwIoctl(struct file *filep, int cmd, unsigned long arg)
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{
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int ret = -1;
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switch (cmd) {
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default:
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PRINT_ERR("!!!bad command!!!\n");
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return -EINVAL;
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}
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return ret;
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}
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static ssize_t RandomHwRead(struct file *filep, char *buffer, size_t buflen)
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{
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int ret = -1;
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if (g_randomOp.read != NULL) {
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ret = g_randomOp.read(buffer, buflen);
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if (ret == ENOERR) {
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ret = buflen;
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}
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} else {
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ret = -1;
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}
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return ret;
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}
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static ssize_t RandomMap(struct file *filep, LosVmMapRegion *region)
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{
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PRINTK("%s %d, mmap is not support\n", __FUNCTION__, __LINE__);
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return 0;
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}
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static const struct file_operations_vfs g_randomHwDevOps = {
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RandomHwOpen, /* open */
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RandomHwClose, /* close */
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RandomHwRead, /* read */
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NULL, /* write */
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NULL, /* seek */
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RandomHwIoctl, /* ioctl */
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RandomMap, /* mmap */
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#ifndef CONFIG_DISABLE_POLL
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NULL, /* poll */
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#endif
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NULL, /* unlink */
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};
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int DevUrandomRegister(void)
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{
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if (g_randomOp.support != NULL) {
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int ret = g_randomOp.support();
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if (ret) {
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return register_driver("/dev/urandom", &g_randomHwDevOps, 0666, 0); /* 0666: file mode */
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}
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}
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return -EPERM;
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}
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