186 lines
6.9 KiB
C
186 lines
6.9 KiB
C
/************************************************************************************
|
|
* include/nuttx/input/buttons.h
|
|
*
|
|
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
************************************************************************************/
|
|
|
|
#ifndef __INCLUDE_NUTTX_INPUT_BUTTONS_H
|
|
#define __INCLUDE_NUTTX_INPUT_BUTTONS_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/fs/ioctl.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifndef CONFIG_BUTTONS_NPOLLWAITERS
|
|
# define CONFIG_BUTTONS_NPOLLWAITERS 2
|
|
#endif
|
|
|
|
/* ioctl commands */
|
|
|
|
/* Command: BTNIOC_SUPPORTED
|
|
* Description: Report the set of button events supported by the hardware;
|
|
* Argument: A pointer to writeable btn_buttonset_t value in which to
|
|
* return the set of supported buttons.
|
|
* Return: Zero (OK) on success. Minus one will be returned on failure
|
|
* with the errno value set appropriately.
|
|
*/
|
|
|
|
#define BTNIOC_SUPPORTED _BTNIOC(0x0001)
|
|
|
|
/* Command: BTNIOC_REGISTER
|
|
* Description: Register to receive a signal whenever there is a change in
|
|
* the state of button inputs. This feature, of course, depends
|
|
* upon interrupt GPIO support from the platform.
|
|
* Argument: A read-only pointer to an instance of struct btn_notify_s
|
|
* Return: Zero (OK) on success. Minus one will be returned on failure
|
|
* with the errno value set appropriately.
|
|
*/
|
|
|
|
#define BTNIOC_REGISTER _BTNIOC(0x0002)
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
/* This type is a bit set that contains the state of all buttons as defined
|
|
* in arch/board/board.h. This is the value that is returned when reading
|
|
* from the button driver.
|
|
*/
|
|
|
|
typedef uint8_t btn_buttonset_t;
|
|
|
|
/* A reference to this structure is provided with the BTNIOC_REGISTER IOCTL
|
|
* command and describes the conditions under which the client would like
|
|
* to receive notification.
|
|
*/
|
|
|
|
struct btn_notify_s
|
|
{
|
|
btn_buttonset_t bn_press; /* Set of button depressions to be notified */
|
|
btn_buttonset_t bn_release; /* Set of button releases to be notified */
|
|
uint8_t bn_signo; /* Signal number to use in the notification */
|
|
};
|
|
|
|
/* This is the type of the button interrupt handler used with the struct
|
|
* btn_lowerhalf_s enable() method.
|
|
*/
|
|
|
|
struct btn_lowerhalf_s;
|
|
typedef CODE void (*btn_handler_t)
|
|
(FAR const struct btn_lowerhalf_s *lower, FAR void *arg);
|
|
|
|
/* The button driver is a two-part driver:
|
|
*
|
|
* 1) A common upper half driver that provides the common user interface to
|
|
* the buttons,
|
|
* 2) Platform-specific lower half drivers that provide the interface
|
|
* between the common upper half and the platform discrete button inputs.
|
|
*
|
|
* This structure defines the interface between an instance of the lower
|
|
* half driver and the common upper half driver. Such an instance is
|
|
* passed to the upper half driver when the driver is initialized, binding
|
|
* the upper and lower halves into one driver.
|
|
*/
|
|
|
|
struct btn_lowerhalf_s
|
|
{
|
|
/* Return the set of buttons supported by the board */
|
|
|
|
CODE btn_buttonset_t (*bl_supported)(FAR const struct btn_lowerhalf_s *lower);
|
|
|
|
/* Return the current state of button data (only) */
|
|
|
|
CODE btn_buttonset_t (*bl_buttons)(FAR const struct btn_lowerhalf_s *lower);
|
|
|
|
/* Enable interrupts on the selected set of buttons. An empty set will
|
|
* disable all interrupts.
|
|
*/
|
|
|
|
CODE void (*bl_enable)(FAR const struct btn_lowerhalf_s *lower,
|
|
btn_buttonset_t press, btn_buttonset_t release,
|
|
btn_handler_t handler, FAR void *arg);
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: btn_register
|
|
*
|
|
* Description:
|
|
* Bind the lower half button driver to an instance of the upper half
|
|
* button driver and register the composite character driver as the
|
|
* specified device.
|
|
*
|
|
* Input Parameters:
|
|
* devname - The name of the button device to be registered.
|
|
* This should be a string of the form "/dev/btnN" where N is the the
|
|
* minor device number.
|
|
* lower - An instance of the platform-specific button lower half driver.
|
|
*
|
|
* Returned Values:
|
|
* Zero (OK) is returned on success. Otherwise a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int btn_register(FAR const char *devname,
|
|
FAR const struct btn_lowerhalf_s *lower);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_NUTTX_INPUT_BUTTONS_H */
|
|
|