134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/************************************************************************************
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* include/nuttx/analog/comp.h
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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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#ifndef __INCLUDE_NUTTX_ANALOG_COMP_H
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#define __INCLUDE_NUTTX_ANALOG_COMP_H
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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 <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/semaphore.h>
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#ifndef CONFIG_DEV_COMP_NPOLLWAITERS
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# define CONFIG_DEV_COMP_NPOLLWAITERS 2
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#endif
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/************************************************************************************
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* Public Types
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************************************************************************************/
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struct comp_dev_s;
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struct comp_callback_s
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{
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/* This method is called from the lower half, platform-specific COMP logic when
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* comparator output state changes.
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*
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* Input Parameters:
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* dev - The COMP device structure that was previously registered by
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* adc_register()
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* val - The actual value of the comparator output.
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*/
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CODE int (*au_notify)(FAR struct comp_dev_s *dev, uint8_t val);
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};
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struct comp_ops_s
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{
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/* Bind the upper-half driver callbacks to the lower-half implementation. This
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* must be called early in order to receive COMP event notifications.
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*/
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CODE int (*ao_bind)(FAR struct comp_dev_s *dev,
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FAR const struct comp_callback_s *callback);
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/* Configure the COMP. This method is called the first time that the COMP
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* device is opened. This will occur when the port is first opened.
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* This setup includes configuring and attaching COMP interrupts. Interrupts
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* are all disabled upon return.
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*/
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CODE int (*ao_setup)(FAR struct comp_dev_s *dev);
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/* Disable the COMP. This method is called when the COMP device is closed.
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* This method reverses the operation of the setup method.
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* Works only if COMP device is not locked.
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*/
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CODE void (*ao_shutdown)(FAR struct comp_dev_s *dev);
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/* Read COMP output state */
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CODE int (*ao_read)(FAR struct comp_dev_s *dev);
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/* All ioctl calls will be routed through this method */
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CODE int (*ao_ioctl)(FAR struct comp_dev_s *dev, int cmd, unsigned long arg);
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};
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struct comp_dev_s
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{
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#ifdef CONFIG_COMP
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/* Fields managed by common upper half COMP logic */
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uint8_t ad_ocount; /* The number of times the device has been opened */
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uint8_t val; /* Comparator value after output transition event */
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sem_t ad_sem; /* Used to serialize access */
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sem_t ad_readsem; /* Blocking read */
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/* pollfd's for output transition events */
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struct pollfd *d_fds[CONFIG_DEV_COMP_NPOLLWAITERS];
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#endif
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/* Fields provided by lower half COMP logic */
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FAR const struct comp_ops_s *ad_ops; /* Arch-specific operations */
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FAR void *ad_priv; /* Used by the arch-specific logic */
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};
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/************************************************************************************
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* Public Function Prototypes
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************************************************************************************/
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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int comp_register(FAR const char *path, FAR struct comp_dev_s *dev);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_NUTTX_ANALOG_COMP_H */
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