204 lines
7.2 KiB
C
204 lines
7.2 KiB
C
/****************************************************************************
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* include/nuttx/input/mxt.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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_INPUT_MXT_H
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#define __INCLUDE_NUTTX_INPUT_MXT_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 <stdint.h>
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#include <stdbool.h>
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#include <nuttx/i2c/i2c_master.h>
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_MXT)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Maximum number of threads than can be waiting for POLL events */
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#ifndef CONFIG_MXT_NPOLLWAITERS
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# define CONFIG_MXT_NPOLLWAITERS 2
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#endif
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/* Thresholding
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*
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* New touch positions will only be reported when the X or Y data
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* changes by these thresholds. This trades reduced data rates for some
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* loss in dragging accuracy. For 12-bit values the raw ranges are
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* 0-4095. So for example, if your display is 800x480, then THRESHX=5
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* and THRESHY=8 would correspond to a one pixel change.
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*
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* NOTE: This does nothing to reduce the interrupt rate. It only
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* reduces the rate at which touch events are reports.
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*/
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#ifndef CONFIG_MXT_MXT_THRESHX
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# define CONFIG_MXT_MXT_THRESHX 5
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#endif
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#ifndef CONFIG_MXT_MXT_THRESHY
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# define CONFIG_MXT_MXT_THRESHY 8
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#endif
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/* Buttons are not supported */
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#undef CONFIG_MXT_BUTTONS
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/* Check for some required settings. This can save the user a lot of time
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* in getting the right configuration.
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*/
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#ifndef CONFIG_SCHED_WORKQUEUE
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# error "Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected."
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#endif
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/* Helper macros ************************************************************/
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#define MXT_ATTACH(s,isr,arg) ((s)->attach(s,isr,arg))
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#define MXT_DETACH(s) ((s)->attach(s,NULL,NULL))
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#define MXT_ENABLE(s) ((s)->enable(s,true))
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#define MXT_DISABLE(s) ((s)->enable(s,false))
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#define MXT_CLEAR(s) ((s)->clear(s))
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is the type of the MXT interrupt handler. The lower level code will
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* intercept the interrupt and provide the upper level with the private data
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* that was provided when the interrupt was attached.
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*/
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struct mxt_lower_s;
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typedef CODE int (*mxt_handler_t)(FAR const struct mxt_lower_s *lower,
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FAR void *arg);
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/* A reference to a structure of this type must be passed to the MXT
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* driver. This structure provides information about the configuration
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* of the MXT and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active.
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*/
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struct mxt_lower_s
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{
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/* Device characterization */
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uint32_t frequency; /* Initial I2C frequency */
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uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */
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/* True: Swap X and Y values */
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bool swapxy;
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#ifdef CONFIG_MXT_BUTTONS
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/* Buttons are not currently supported. But if they were we
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* would need to know which which.
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*/
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uint8_t bmask; /* Bit encoded, see MXT_GPIOn_MASK */
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#endif
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the MXT driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the MXT interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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*/
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int (*attach)(FAR const struct mxt_lower_s *lower, mxt_handler_t isr,
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FAR void *arg);
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void (*enable)(FAR const struct mxt_lower_s *lower, bool enable);
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void (*clear)(FAR const struct mxt_lower_s *lower);
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};
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/****************************************************************************
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* Public Data
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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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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: mxt_register
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*
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* Description:
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* Configure the maXTouch to use the provided I2C device instance. This
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* will register the driver as /dev/inputN where N is the minor device
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* number
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*
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* Input Parameters:
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* i2c - An I2C driver instance
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* lower - Persistent board configuration data
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int mxt_register(FAR struct i2c_master_s *i2c,
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FAR const struct mxt_lower_s *lower, int minor);
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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_INPUT && CONFIG_INPUT_MXT */
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#endif /* __INCLUDE_NUTTX_INPUT_MXT_H */
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