266 lines
9.9 KiB
C
266 lines
9.9 KiB
C
/****************************************************************************
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* include/nuttx/timer.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Bob Doiron
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written 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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_TIMER_H
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#define __INCLUDE_NUTTX_TIMER_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_TIMER
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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 timer driver uses a standard character driver framework. However,
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* since the timer 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 timer ioctl commands are listed below:
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*
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* These are detected and handled by the "upper half" timer driver.
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*
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* TCIOC_START - Start the timer
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* Argument: Ignored
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* TCIOC_STOP - Stop the timer
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* Argument: Ignored
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* TCIOC_GETSTATUS - Get the status of the timer.
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* Argument: A writeable pointer to struct timer_status_s.
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* TCIOC_SETTIMEOUT - Reset the timer timeout to this value
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* Argument: A 32-bit timeout value in microseconds.
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* TCIOC_SETHANDLER - Call this handler on timer expiration
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* Argument: A pointer to struct timer_sethandler_s.
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*
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* WARNING: May change TCIOC_SETTIMEOUT to pass pointer to 64bit nanoseconds
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* or timespec structure.
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*
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* NOTE: The TCIOC_SETHANDLER ioctl cannot be supported in the kernel build
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* mode. In that case direct callbacks from kernel space into user space is
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* forbidden.
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*/
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#define TCIOC_START _TCIOC(0x001)
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#define TCIOC_STOP _TCIOC(0x002)
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#define TCIOC_GETSTATUS _TCIOC(0x003)
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#define TCIOC_SETTIMEOUT _TCIOC(0x004)
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#define TCIOC_SETHANDLER _TCIOC(0x005)
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/* Bit Settings *************************************************************/
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/* Bit settings for the struct timer_status_s flags field */
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#define TCFLAGS_ACTIVE (1 << 0) /* 1=The timer is running */
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#define TCFLAGS_HANDLER (1 << 1) /* 1=Call the user function when the
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* timer expires */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* User function prototype. Returns true to reload the timer, and the
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* function can modify the next interval if desired.
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*/
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typedef bool (*tccb_t)(FAR uint32_t *next_interval_us);
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/* This is the type of the argument passed to the TCIOC_SETHANDLER ioctl */
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struct timer_sethandler_s
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{
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CODE tccb_t newhandler; /* The new timer interrupt handler */
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CODE tccb_t oldhandler; /* The previous timer interrupt handler (if any) */
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};
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/* This is the type of the argument passed to the TCIOC_GETSTATUS ioctl and
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* and returned by the "lower half" getstatus() method.
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*/
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struct timer_status_s
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{
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uint32_t flags; /* See TCFLAGS_* definitions above */
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uint32_t timeout; /* The current timeout setting (in microseconds) */
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uint32_t timeleft; /* Time left until the timer expiration
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* (in microseconds) */
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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 timer_lowerhalf_s;
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struct timer_ops_s
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{
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/* Required methods ********************************************************/
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/* Start the timer, resetting the time to the current timeout */
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CODE int (*start)(FAR struct timer_lowerhalf_s *lower);
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/* Stop the timer */
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CODE int (*stop)(FAR struct timer_lowerhalf_s *lower);
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/* Get the current timer status */
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CODE int (*getstatus)(FAR struct timer_lowerhalf_s *lower,
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FAR struct timer_status_s *status);
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/* Set a new timeout value (and reset the timer) */
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CODE int (*settimeout)(FAR struct timer_lowerhalf_s *lower,
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uint32_t timeout);
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/* Call this user provider timeout handler on timeout.
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* NOTE: Providing handler==NULL disable.
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*/
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CODE tccb_t (*sethandler)(FAR struct timer_lowerhalf_s *lower,
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CODE tccb_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 timer_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 timer_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 timer_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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* "Upper-Half" Timer Driver Interfaces
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****************************************************************************/
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/****************************************************************************
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* Name: timer_register
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*
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* Description:
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* This function binds an instance of a "lower half" timer driver with the
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* "upper half" timer device and registers that device so that can be used
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* 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: Normally, this function would not be called by application code.
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* Rather it is called indirectly through the architecture-specific
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* initialization.
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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 timer
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* drivers as "/dev/timer0", "/dev/timer1", 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 timer driver. This
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* instance is bound to the timer 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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FAR void *timer_register(FAR const char *path,
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FAR struct timer_lowerhalf_s *lower);
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/****************************************************************************
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* Name: timer_unregister
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*
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* Description:
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* This function can be called to disable and unregister the timer
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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 timer_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 timer_unregister(FAR void *handle);
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/****************************************************************************
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* Platform-Independent "Lower-Half" Timer Driver Interfaces
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****************************************************************************/
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/****************************************************************************
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* Architecture-specific Application Interfaces
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****************************************************************************/
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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_TIMER */
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#endif /* __INCLUDE_NUTTX_TIMER_H */
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