/************************************************************************************ * include/nuttx/input/touchscreen.h * * Copyright (C) 2011-2012, 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #ifdef CONFIG_INPUT /************************************************************************************ * Pre-processor Definitions ************************************************************************************/ /* IOCTL Commands *******************************************************************/ /* Common TSC 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 */ #define TSC_FIRST 0x0001 /* First common command */ #define TSC_NCMDS 4 /* Four common commands */ /* User defined ioctl commands are also supported. However, the TSC driver must * reserve a block of commands as follows in order prevent IOCTL command numbers * from overlapping. * * This is generally done as follows. The first reservation for TSC driver A would * look like: * * TSC_A_FIRST (TSC_FIRST + TSC_NCMDS) <- First command * TSC_A_NCMDS 42 <- Number of commands * * IOCTL commands for TSC driver A would then be defined in a TSC A header file like: * * TSCIOC_A_CMD1 _TSIOC(TSC_A_FIRST + 0) * TSCIOC_A_CMD2 _TSIOC(TSC_A_FIRST + 1) * TSCIOC_A_CMD3 _TSIOC(TSC_A_FIRST + 2) * ... * TSCIOC_A_CMD42 _TSIOC(TSC_A_FIRST + 41) * * The next reservation would look like: * * TSC_B_FIRST (TSC_A_FIRST + TSC_A_NCMDS) <- Next command * TSC_B_NCMDS 77 <- Number of commands */ /* 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 certain */ #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 */