268 lines
9.9 KiB
C
268 lines
9.9 KiB
C
/****************************************************************************
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* include/nuttx/timers/watchdog.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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_TIMERS_WATCHDOG_H
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#define __INCLUDE_NUTTX_TIMERS_WATCHDOG_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 <nuttx/irq.h>
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#include <nuttx/fs/ioctl.h>
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#ifdef CONFIG_WATCHDOG
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* IOCTL Commands ***********************************************************/
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/* The watchdog driver uses a standard character driver framework. However,
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* since the watchdog driver is a device control interface and not a data
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* transfer interface, the majority of the functionality is implemented in
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* driver ioctl calls. The watchdog ioctl commands are lised below:
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*
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* These are detected and handled by the "upper half" watchdog timer driver.
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*
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* WDIOC_START - Start the watchdog timer
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* Argument: Ignored
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* WDIOC_STOP - Stop the watchdog timer
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* Argument: Ignored
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* WDIOC_GETSTATUS - Get the status of the watchdog timer.
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* Argument: A writeable pointer to struct
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* watchdog_status_s.
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* WDIOC_SETTIMEOUT - Reset the watchdog timeout to this value
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* Argument: A 32-bit timeout value in milliseconds.
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* WDIOC_CAPTURE - Do not reset. Instead, called this handler.
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* Argument: A pointer to struct watchdog_capture_s.
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* WDIOC_KEEPALIVE - Reset the watchdog timer ("ping", "pet the dog");
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* Argument: Ignored
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*
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* These may be supported by certain "lower half" drivers
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*
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* WDIOC_MINTIME - Set the minimum ping time. If two keepalive ioctls
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* are received within this time, a reset event will
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* be generated. This feature should assume to be
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* disabled after WDIOC_SETTIMEOUT.
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* Argument: A 32-bit time value in milliseconds.
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*/
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#define WDIOC_START _WDIOC(0x001)
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#define WDIOC_STOP _WDIOC(0x002)
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#define WDIOC_GETSTATUS _WDIOC(0x003)
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#define WDIOC_SETTIMEOUT _WDIOC(0x004)
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#define WDIOC_CAPTURE _WDIOC(0x005)
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#define WDIOC_KEEPALIVE _WDIOC(0x006)
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#define WDIOC_MINTIME _WDIOC(0x080)
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/* Bit Settings *************************************************************/
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/* Bit settings for the struct watchdog_status_s flags field */
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#define WDFLAGS_ACTIVE (1 << 0) /* 1=The watchdog timer is running */
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#define WDFLAGS_RESET (1 << 1) /* 1=Reset when the watchdog timer expires */
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#define WDFLAGS_CAPTURE (1 << 2) /* 1=Call the user function when the
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* watchdog timer expires */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is the type of the argument passed to the WDIOC_CAPTURE ioctl */
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struct watchdog_capture_s
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{
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CODE xcpt_t newhandler; /* The new watchdog capture handler */
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CODE xcpt_t oldhandler; /* The previous watchdog capture handler (if any) */
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};
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/* This is the type of the argument passed to the WDIOC_GETSTATUS ioctl and
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* and returned by the "lower half" getstatus() method.
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*/
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struct watchdog_status_s
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{
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uint32_t flags; /* See WDFLAGS_* definitions above */
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uint32_t timeout; /* The current timeout setting (in milliseconds) */
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uint32_t timeleft; /* Time left until the watchdog expiration
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* (in milliseconds) */
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};
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/* This structure provides the "lower-half" driver operations available to
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* the "upper-half" driver.
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*/
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struct watchdog_lowerhalf_s;
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struct watchdog_ops_s
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{
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/* Required methods *******************************************************/
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/* Start the watchdog timer, resetting the time to the current timeout */
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CODE int (*start)(FAR struct watchdog_lowerhalf_s *lower);
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/* Stop the watchdog timer */
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CODE int (*stop)(FAR struct watchdog_lowerhalf_s *lower);
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/* Optional methods *******************************************************/
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/* Reset the watchdog timer to the current timeout value, prevent any
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* imminent watchdog timeouts. This is sometimes referred as "pinging" the
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* watchdog timer or "petting the dog".
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*/
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CODE int (*keepalive)(FAR struct watchdog_lowerhalf_s *lower);
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/* Get the current watchdog timer status */
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CODE int (*getstatus)(FAR struct watchdog_lowerhalf_s *lower,
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FAR struct watchdog_status_s *status);
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/* Set a new timeout value (and reset the watchdog timer) */
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CODE int (*settimeout)(FAR struct watchdog_lowerhalf_s *lower,
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uint32_t timeout);
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/* Don't reset on watchdog timer timeout; instead, call this user provider
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* timeout handler. NOTE: Providing handler==NULL will restore the reset
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* behavior.
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*/
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CODE xcpt_t (*capture)(FAR struct watchdog_lowerhalf_s *lower,
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CODE xcpt_t handler);
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/* Any ioctl commands that are not recognized by the "upper-half" driver
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* are forwarded to the lower half driver through this method.
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*/
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CODE int (*ioctl)(FAR struct watchdog_lowerhalf_s *lower, int cmd,
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unsigned long arg);
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};
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/* This structure provides the publicly visible representation of the
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* "lower-half" driver state structure. "lower half" drivers will have an
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* internal structure definition that will be cast-compatible with this
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* structure definitions.
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*/
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struct watchdog_lowerhalf_s
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{
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/* Publicly visible portion of the "lower-half" driver state structure. */
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FAR const struct watchdog_ops_s *ops; /* Lower half operations */
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/* The remainder of the structure is used by the "lower-half" driver
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* for whatever state storage that it may need.
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*/
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: watchdog_register
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*
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* Description:
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* This function binds an instance of a "lower half" watchdog driver with
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* the "upper half" watchdog device and registers that device so that can
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* be used by application code.
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*
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* When this function is called, the "lower half" driver should be in the
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* disabled state (as if the stop() method had already been called).
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*
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* NOTE: This function would not be called by application code. Rather it
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* is called indirectly through the architecture-specific interfaces.
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*
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* Input Parameters:
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* dev path - The full path to the driver to be registers in the NuttX
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* pseudo-filesystem. The recommended convention is to name all watchdog
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* drivers as "/dev/watchdog0", "/dev/watchdog1", etc. where the driver
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* path differs only in the "minor" number at the end of the device name.
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* lower - A pointer to an instance of lower half watchdog driver. This
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* instance is bound to the watchdog driver and must persists as long as
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* the driver persists.
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*
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* Returned Value:
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* On success, a non-NULL handle is returned to the caller. In the event
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* of any failure, a NULL value is returned.
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*
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****************************************************************************/
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#if defined(CONFIG_WATCHDOG_AUTOMONITOR_BY_ONESHOT)
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struct oneshot_lowerhalf_s;
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FAR void *watchdog_register(FAR const char *path,
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FAR struct watchdog_lowerhalf_s *lower,
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FAR struct oneshot_lowerhalf_s *oneshot);
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#elif defined(CONFIG_WATCHDOG_AUTOMONITOR_BY_TIMER)
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struct timer_lowerhalf_s;
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FAR void *watchdog_register(FAR const char *path,
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FAR struct watchdog_lowerhalf_s *lower,
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FAR struct timer_lowerhalf_s *timer);
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#else
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FAR void *watchdog_register(FAR const char *path,
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FAR struct watchdog_lowerhalf_s *lower);
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#endif
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/****************************************************************************
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* Name: watchdog_unregister
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*
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* Description:
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* This function can be called to disable and unregister the watchdog
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* device driver.
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*
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* Input Parameters:
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* handle - This is the handle that was returned by watchdog_register()
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void watchdog_unregister(FAR void *handle);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_WATCHDOG */
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#endif /* __INCLUDE_NUTTX_TIMERS_WATCHDOG_H */
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