191 lines
6.4 KiB
C
191 lines
6.4 KiB
C
/****************************************************************************
|
|
* include/nuttx/input/mxt.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_NUTTX_INPUT_MXT_H
|
|
#define __INCLUDE_NUTTX_INPUT_MXT_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
#include <nuttx/i2c/i2c_master.h>
|
|
|
|
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_MXT)
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Configuration ************************************************************/
|
|
|
|
/* Maximum number of threads than can be waiting for POLL events */
|
|
|
|
#ifndef CONFIG_MXT_NPOLLWAITERS
|
|
# define CONFIG_MXT_NPOLLWAITERS 2
|
|
#endif
|
|
|
|
/* Thresholding
|
|
*
|
|
* New touch positions will only be reported when the X or Y data
|
|
* changes by these thresholds. This trades reduced data rates for some
|
|
* loss in dragging accuracy. For 12-bit values the raw ranges are
|
|
* 0-4095. So for example, if your display is 800x480, then THRESHX=5
|
|
* and THRESHY=8 would correspond to a one pixel change.
|
|
*
|
|
* NOTE: This does nothing to reduce the interrupt rate. It only
|
|
* reduces the rate at which touch events are reports.
|
|
*/
|
|
|
|
#ifndef CONFIG_MXT_MXT_THRESHX
|
|
# define CONFIG_MXT_MXT_THRESHX 5
|
|
#endif
|
|
|
|
#ifndef CONFIG_MXT_MXT_THRESHY
|
|
# define CONFIG_MXT_MXT_THRESHY 8
|
|
#endif
|
|
|
|
/* Buttons are not supported */
|
|
|
|
#undef CONFIG_MXT_BUTTONS
|
|
|
|
/* Check for some required settings. This can save the user a lot of time
|
|
* in getting the right configuration.
|
|
*/
|
|
|
|
#ifndef CONFIG_SCHED_WORKQUEUE
|
|
# error "Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected."
|
|
#endif
|
|
|
|
/* Helper macros ************************************************************/
|
|
|
|
#define MXT_ATTACH(s,isr,arg) ((s)->attach(s,isr,arg))
|
|
#define MXT_DETACH(s) ((s)->attach(s,NULL,NULL))
|
|
#define MXT_ENABLE(s) ((s)->enable(s,true))
|
|
#define MXT_DISABLE(s) ((s)->enable(s,false))
|
|
#define MXT_CLEAR(s) ((s)->clear(s))
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* This is the type of the MXT interrupt handler. The lower level code will
|
|
* intercept the interrupt and provide the upper level with the private data
|
|
* that was provided when the interrupt was attached.
|
|
*/
|
|
|
|
struct mxt_lower_s;
|
|
typedef CODE int (*mxt_handler_t)(FAR const struct mxt_lower_s *lower,
|
|
FAR void *arg);
|
|
|
|
/* A reference to a structure of this type must be passed to the MXT
|
|
* driver. This structure provides information about the configuration
|
|
* of the MXT and provides some board-specific hooks.
|
|
*
|
|
* Memory for this structure is provided by the caller. It is not copied
|
|
* by the driver and is presumed to persist while the driver is active.
|
|
*/
|
|
|
|
struct mxt_lower_s
|
|
{
|
|
/* Device characterization */
|
|
|
|
uint32_t frequency; /* Initial I2C frequency */
|
|
uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */
|
|
|
|
/* True: Swap X and Y values */
|
|
|
|
bool swapxy;
|
|
|
|
#ifdef CONFIG_MXT_BUTTONS
|
|
/* Buttons are not currently supported. But if they were we
|
|
* would need to know which which.
|
|
*/
|
|
|
|
uint8_t bmask; /* Bit encoded, see MXT_GPIOn_MASK */
|
|
#endif
|
|
|
|
/* IRQ/GPIO access callbacks. These operations all hidden behind
|
|
* callbacks to isolate the MXT driver from differences in GPIO
|
|
* interrupt handling by varying boards and MCUs. If possible,
|
|
* interrupts should be configured on both rising and falling edges
|
|
* so that contact and loss-of-contact events can be detected.
|
|
*
|
|
* attach - Attach the MXT interrupt handler to the GPIO interrupt
|
|
* enable - Enable or disable the GPIO interrupt
|
|
* clear - Acknowledge/clear any pending GPIO interrupt
|
|
*/
|
|
|
|
int (*attach)(FAR const struct mxt_lower_s *lower, mxt_handler_t isr,
|
|
FAR void *arg);
|
|
void (*enable)(FAR const struct mxt_lower_s *lower, bool enable);
|
|
void (*clear)(FAR const struct mxt_lower_s *lower);
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: mxt_register
|
|
*
|
|
* Description:
|
|
* Configure the maXTouch to use the provided I2C device instance. This
|
|
* will register the driver as /dev/inputN where N is the minor device
|
|
* number
|
|
*
|
|
* Input Parameters:
|
|
* i2c - An I2C driver instance
|
|
* lower - Persistent board configuration data
|
|
* minor - The input device minor number
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mxt_register(FAR struct i2c_master_s *i2c,
|
|
FAR const struct mxt_lower_s *lower, int minor);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_INPUT && CONFIG_INPUT_MXT */
|
|
#endif /* __INCLUDE_NUTTX_INPUT_MXT_H */
|