161 lines
4.6 KiB
C
161 lines
4.6 KiB
C
/****************************************************************************
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* drivers/power/relay/relay.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/mutex.h>
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#include <nuttx/power/relay.h>
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#include <nuttx/fs/fs.h>
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static ssize_t relay_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t relay_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int relay_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_relay_ops =
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{
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NULL, /* open */
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NULL, /* close */
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relay_read, /* read */
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relay_write, /* write */
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NULL, /* seek */
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relay_ioctl, /* ioctl */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static ssize_t relay_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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return 0;
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}
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static ssize_t relay_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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return 0;
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}
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static int relay_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct relay_dev_s *dev;
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FAR struct inode *inode;
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int ret;
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private != NULL);
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dev = inode->i_private;
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ret = nxmutex_lock(&dev->lock);
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if (ret < 0)
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{
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return ret;
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}
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switch (cmd)
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{
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case RELAYIOC_SET:
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{
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FAR bool *enable = (FAR bool *)((uintptr_t)arg);
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DEBUGASSERT(enable != NULL);
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ret = dev->ops->set(dev, *enable);
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}
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break;
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case RELAYIOC_GET:
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DEBUGASSERT(arg != 0);
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ret = dev->ops->get(dev, (FAR bool *)((uintptr_t)arg));
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break;
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default:
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if (dev->ops->ioctl != NULL)
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{
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ret = dev->ops->ioctl(dev, cmd, arg);
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}
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else
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{
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ret = -ENOTSUP;
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}
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break;
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}
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nxmutex_unlock(&dev->lock);
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: relay_register
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*
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* Description:
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* Register the relay driver to the vfs.
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*
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* Input Parameters:
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* dev - the relay device
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* devname - the relay device name
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int relay_register(FAR struct relay_dev_s *dev, FAR const char *devname)
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{
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DEBUGASSERT(devname != NULL);
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DEBUGASSERT(dev != NULL && dev->ops != NULL);
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if (dev->ops->set == NULL || dev->ops->get == NULL)
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{
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return -EINVAL;
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}
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nxmutex_init(&dev->lock);
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return register_driver(devname, &g_relay_ops, 0666, dev);
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}
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