155 lines
6.4 KiB
C
155 lines
6.4 KiB
C
/************************************************************************************
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* include/nuttx/input/touchscreen.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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************************************************************************************/
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/* The TOUCHSCREEN driver exports a standard character driver interface. By
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* convention, the touchscreen driver is registers as an input device at
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* /dev/inputN where N uniquely identifies the driver instance.
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*
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* This header file documents the generic interface that all NuttX
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* touchscreen devices must conform. It adds standards and conventions on
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* top of the standard character driver interface.
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*/
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#ifndef __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H
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#define __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_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 <nuttx/fs/ioctl.h>
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#ifdef CONFIG_INPUT
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* IOCTL Commands *******************************************************************/
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/* Common TSC IOCTL commands */
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#define TSIOC_SETCALIB _TSIOC(0x0001) /* arg: Pointer to int calibration value */
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#define TSIOC_GETCALIB _TSIOC(0x0002) /* arg: Pointer to int calibration value */
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#define TSIOC_SETFREQUENCY _TSIOC(0x0003) /* arg: Pointer to uint32_t frequency value */
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#define TSIOC_GETFREQUENCY _TSIOC(0x0004) /* arg: Pointer to uint32_t frequency value */
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#define TSC_FIRST 0x0001 /* First common command */
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#define TSC_NCMDS 4 /* Four common commands */
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/* User defined ioctl commands are also supported. However, the TSC driver must
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* reserve a block of commands as follows in order prevent IOCTL command numbers
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* from overlapping.
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*
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* This is generally done as follows. The first reservation for TSC driver A would
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* look like:
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*
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* TSC_A_FIRST (TSC_FIRST + TSC_NCMDS) <- First command
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* TSC_A_NCMDS 42 <- Number of commands
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*
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* IOCTL commands for TSC driver A would then be defined in a TSC A header file like:
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*
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* TSCIOC_A_CMD1 _TSIOC(TSC_A_FIRST + 0)
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* TSCIOC_A_CMD2 _TSIOC(TSC_A_FIRST + 1)
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* TSCIOC_A_CMD3 _TSIOC(TSC_A_FIRST + 2)
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* ...
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* TSCIOC_A_CMD42 _TSIOC(TSC_A_FIRST + 41)
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*
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* The next reservation would look like:
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*
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* TSC_B_FIRST (TSC_A_FIRST + TSC_A_NCMDS) <- Next command
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* TSC_B_NCMDS 77 <- Number of commands
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*/
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/* These definitions provide the meaning of all of the bits that may be
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* reported in the struct touch_point_s flags.
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*/
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#define TOUCH_DOWN (1 << 0) /* A new touch contact is established */
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#define TOUCH_MOVE (1 << 1) /* Movement occurred with previously reported contact */
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#define TOUCH_UP (1 << 2) /* The touch contact was lost */
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#define TOUCH_ID_VALID (1 << 3) /* Touch ID is certain */
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#define TOUCH_POS_VALID (1 << 4) /* Hardware provided a valid X/Y position */
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#define TOUCH_PRESSURE_VALID (1 << 5) /* Hardware provided a valid pressure */
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#define TOUCH_SIZE_VALID (1 << 6) /* Hardware provided a valid H/W contact size */
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/************************************************************************************
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* Public Types
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************************************************************************************/
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/* This structure contains information about a single touch point.
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* Positional units are device specific.
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*/
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struct touch_point_s
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{
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uint8_t id; /* Unique identifies contact; Same in all reports for the contact */
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uint8_t flags; /* See TOUCH_* definitions above */
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int16_t x; /* X coordinate of the touch point (uncalibrated) */
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int16_t y; /* Y coordinate of the touch point (uncalibrated) */
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int16_t h; /* Height of touch point (uncalibrated) */
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int16_t w; /* Width of touch point (uncalibrated) */
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uint16_t pressure; /* Touch pressure */
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};
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/* The typical touchscreen driver is a read-only, input character device driver.
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* the driver write() method is not supported and any attempt to open the
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* driver in any mode other than read-only will fail.
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*
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* Data read from the touchscreen device consists only of touch events and
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* touch sample data. This is reflected by struct touch_sample_s. This
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* structure is returned by either the driver read method.
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*
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* On some devices, multiple touchpoints may be supported. So this top level
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* data structure is a struct touch_sample_s that "contains" a set of touch
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* points. Each touch point is managed individually using an ID that identifies
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* a touch from first contact until the end of the contact.
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*/
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struct touch_sample_s
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{
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int npoints; /* The number of touch points in point[] */
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struct touch_point_s point[1]; /* Actual dimension is npoints */
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};
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#define SIZEOF_TOUCH_SAMPLE_S(n) \
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(sizeof(struct touch_sample_s) + ((n) - 1) * sizeof(struct touch_point_s))
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/************************************************************************************
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* Public Function Prototypes
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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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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_INPUT */
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#endif /* __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H */
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