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/************************************************************************************
* include/nuttx/input/touchscreen.h
*
* Copyright (C) 2011-2012 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.
*
************************************************************************************/
/* The TOUCHSCREEN driver exports a standard character driver interface. By
* convention, the touchscreen driver is registers as an input device at
* /dev/inputN where N uniquely identifies the driver instance.
*
* This header file documents the generic interface that all NuttX
* touchscreen devices must conform. It adds standards and conventions on
* top of the standard character driver interface.
*/
#ifndef __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H
#define __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <nuttx/fs/ioctl.h>
#ifdef CONFIG_INPUT
/************************************************************************************
* Pre-Processor Definitions
************************************************************************************/
/* IOCTL Commands *******************************************************************/
#define TSIOC_SETCALIB _TSIOC(0x0001) /* arg: Pointer to int calibration value */
#define TSIOC_GETCALIB _TSIOC(0x0002) /* arg: Pointer to int calibration value */
#define TSIOC_SETFREQUENCY _TSIOC(0x0003) /* arg: Pointer to uint32_t frequency value */
#define TSIOC_GETFREQUENCY _TSIOC(0x0004) /* arg: Pointer to uint32_t frequency value */
/* Specific touchscreen drivers may support additional, device specific ioctl
* commands, beginning with this value:
*/
#define TSIOC_USER 0x0005 /* Lowest, unused TSC ioctl command */
/* These definitions provide the meaning of all of the bits that may be
* reported in the struct touch_point_s flags.
*/
#define TOUCH_DOWN (1 << 0) /* A new touch contact is established */
#define TOUCH_MOVE (1 << 1) /* Movement occurred with previously reported contact */
#define TOUCH_UP (1 << 2) /* The touch contact was lost */
#define TOUCH_ID_VALID (1 << 3) /* Touch ID is uncertain */
#define TOUCH_POS_VALID (1 << 4) /* Hardware provided a valid X/Y position */
#define TOUCH_PRESSURE_VALID (1 << 5) /* Hardware provided a valid pressure */
#define TOUCH_SIZE_VALID (1 << 6) /* Hardware provided a valid H/W contact size */
/************************************************************************************
* Public Types
************************************************************************************/
/* This structure contains information about a single touch point.
* Positional units are device specific.
*/
struct touch_point_s
{
uint8_t id; /* Unique identifies contact; Same in all reports for the contact */
uint8_t flags; /* See TOUCH_* definitions above */
int16_t x; /* X coordinate of the touch point (uncalibrated) */
int16_t y; /* Y coordinate of the touch point (uncalibrated) */
int16_t h; /* Height of touch point (uncalibrated) */
int16_t w; /* Width of touch point (uncalibrated) */
uint16_t pressure; /* Touch pressure */
};
/* The typical touchscreen driver is a read-only, input character device driver.
* the driver write() method is not supported and any attempt to open the
* driver in any mode other than read-only will fail.
*
* Data read from the touchscreen device consists only of touch events and
* touch sample data. This is reflected by struct touch_sample_s. This
* structure is returned by either the driver read method.
*
* On some devices, multiple touchpoints may be supported. So this top level
* data structure is a struct touch_sample_s that "contains" a set of touch
* points. Each touch point is managed individually using an ID that identifies
* a touch from first contact until the end of the contact.
*/
struct touch_sample_s
{
int npoints; /* The number of touch points in point[] */
struct touch_point_s point[1]; /* Actual dimension is npoints */
};
#define SIZEOF_TOUCH_SAMPLE_S(n) (sizeof(struct touch_sample_s) + ((n)-1)*sizeof(struct touch_point_s))
/************************************************************************************
* Public Function Prototypes
************************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_INPUT */
#endif /* __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H */
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