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245 lines
10 KiB
245 lines
10 KiB
/******************************************************************************************** |
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* drivers/input/stmpe811.h |
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* |
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* Copyright (C) 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* References: |
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* "STMPE811 S-Touch® advanced resistive touchscreen controller with 8-bit |
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* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics" |
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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 __DRIVERS_INPUT_STMPE811_H |
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#define __DRIVERS_INPUT_STMPE811_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 <wdog.h> |
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#include <semaphore.h> |
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#include <nuttx/clock.h> |
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#include <nuttx/wqueue.h> |
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#include <nuttx/input/stmpe811.h> |
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) |
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/******************************************************************************************** |
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* Pre-Processor Definitions |
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********************************************************************************************/ |
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/* Configuration ****************************************************************************/ |
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/* Reference counting is partially implemented, but not needed in the current design. |
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*/ |
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#undef CONFIG_STMPE811_REFCNT |
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/* No support for the SPI interface yet */ |
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#ifdef CONFIG_STMPE811_SPI |
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# error "Only the STMPE811 I2C interface is supported by this driver" |
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#endif |
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/* Driver support ***************************************************************************/ |
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/* This format is used to construct the /dev/input[n] device driver path. It defined here |
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* so that it will be used consistently in all places. |
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*/ |
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#define DEV_FORMAT "/dev/input%d" |
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#define DEV_NAMELEN 16 |
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/* STMPE811 Resources ************************************************************************/ |
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#ifndef CONFIG_STMPE811_TSC_DISABLE |
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# define STMPE811_ADC_NPINS 4 /* Only pins 0-3 can be used for ADC */ |
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# define STMPE811_GPIO_NPINS 4 /* Only pins 0-3 can be used as GPIOs */ |
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#else |
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# define STMPE811_ADC_NPINS 8 /* All pins can be used for ADC */ |
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# define STMPE811_GPIO_NPINS 8 /* All pins can be used as GPIOs */ |
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#endif |
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/* Driver flags */ |
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#define STMPE811_FLAGS_TSC_INITIALIZED (1 << 0) /* 1: The TSC block has been initialized */ |
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#define STMPE811_FLAGS_GPIO_INITIALIZED (1 << 1) /* 1: The GIO block has been initialized */ |
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#define STMPE811_FLAGS_ADC_INITIALIZED (1 << 2) /* 1: The ADC block has been initialized */ |
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#define STMPE811_FLAGS_TS_INITIALIZED (1 << 3) /* 1: The TS block has been initialized */ |
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/* Timeout to detect missing pen up events */ |
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#define STMPE811_PENUP_TICKS ((100 + (MSEC_PER_TICK-1)) / MSEC_PER_TICK) |
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/******************************************************************************************** |
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* Public Types |
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********************************************************************************************/ |
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/* This describes the state of one contact */ |
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enum stmpe811_contact_3 |
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{ |
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CONTACT_NONE = 0, /* No contact */ |
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CONTACT_DOWN, /* First contact */ |
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CONTACT_MOVE, /* Same contact, possibly different position */ |
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CONTACT_UP, /* Contact lost */ |
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}; |
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/* This structure describes the results of one STMPE811 sample */ |
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struct stmpe811_sample_s |
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{ |
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uint8_t id; /* Sampled touch point ID */ |
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uint8_t contact; /* Contact state (see enum stmpe811_contact_e) */ |
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bool valid; /* True: x,y,z contain valid, sampled data */ |
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uint16_t x; /* Measured X position */ |
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uint16_t y; /* Measured Y position */ |
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uint8_t z; /* Measured Z index */ |
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}; |
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/* This structure represents the state of the STMPE811 driver */ |
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struct stmpe811_dev_s |
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{ |
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#ifdef CONFIG_STMPE811_MULTIPLE |
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FAR struct stmpe811_dev_s *flink; /* Supports a singly linked list of drivers */ |
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#endif |
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/* Common fields */ |
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FAR struct stmpe811_config_s *config; /* Board configuration data */ |
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sem_t exclsem; /* Manages exclusive access to this structure */ |
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#ifdef CONFIG_STMPE811_SPI |
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FAR struct spi_dev_s *spi; /* Saved SPI driver instance */ |
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#else |
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FAR struct i2c_dev_s *i2c; /* Saved I2C driver instance */ |
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#endif |
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uint8_t inuse; /* STMPE811 pins in use */ |
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uint8_t flags; /* See STMPE811_FLAGS_* definitions */ |
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struct work_s work; /* Supports the interrupt handling "bottom half" */ |
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/* Fields that may be disabled to save size if touchscreen support is not used. */ |
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#ifndef CONFIG_STMPE811_TSC_DISABLE |
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#ifdef CONFIG_STMPE811_REFCNT |
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uint8_t crefs; /* Number of times the device has been opened */ |
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#endif |
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uint8_t nwaiters; /* Number of threads waiting for STMPE811 data */ |
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uint8_t id; /* Current touch point ID */ |
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uint8_t minor; /* Touchscreen minor device number */ |
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volatile bool penchange; /* An unreported event is buffered */ |
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uint16_t threshx; /* Thresholded X value */ |
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uint16_t threshy; /* Thresholded Y value */ |
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sem_t waitsem; /* Used to wait for the availability of data */ |
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struct work_s timeout; /* Supports tiemeout work */ |
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WDOG_ID wdog; /* Timeout to detect missing pen down events */ |
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struct stmpe811_sample_s sample; /* Last sampled touch point data */ |
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/* The following is a list if poll structures of threads waiting for |
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* driver events. The 'struct pollfd' reference for each open is also |
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* retained in the f_priv field of the 'struct file'. |
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*/ |
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#ifndef CONFIG_DISABLE_POLL |
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struct pollfd *fds[CONFIG_STMPE811_NPOLLWAITERS]; |
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#endif |
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#endif |
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/* Fields that may be disabled to save size of GPIO support is not used */ |
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#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE) |
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stmpe811_handler_t handlers[STMPE811_GPIO_NPINS]; /* GPIO "interrupt handlers" */ |
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#endif |
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}; |
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/******************************************************************************************** |
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* Public Function Prototypes |
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********************************************************************************************/ |
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/******************************************************************************************** |
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* Name: stmpe811_getreg8 |
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* |
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* Description: |
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* Read from an 8-bit STMPE811 register |
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* |
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********************************************************************************************/ |
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uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr); |
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/******************************************************************************************** |
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* Name: stmpe811_putreg8 |
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* |
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* Description: |
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* Write a value to an 8-bit STMPE811 register |
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* |
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********************************************************************************************/ |
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void stmpe811_putreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr, uint8_t regval); |
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/******************************************************************************************** |
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* Name: stmpe811_getreg16 |
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* |
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* Description: |
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* Read 16-bits of data from an STMPE-11 register |
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* |
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********************************************************************************************/ |
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uint16_t stmpe811_getreg16(FAR struct stmpe811_dev_s *priv, uint8_t regaddr); |
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/******************************************************************************************** |
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* Name: stmpe811_tscint |
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* |
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* Description: |
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* Handle touchscreen interrupt events (this function actually executes in the context of |
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* the worker thread). |
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* |
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********************************************************************************************/ |
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#ifndef CONFIG_STMPE811_TSC_DISABLE |
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void stmpe811_tscworker(FAR struct stmpe811_dev_s *priv, uint8_t intsta) weak_function; |
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#endif |
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/******************************************************************************************** |
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* Name: stmpe811_gpioworker |
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* |
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* Description: |
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* Handle GPIO interrupt events (this function actually executes in the context of the |
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* worker thread). |
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* |
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********************************************************************************************/ |
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#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE) |
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void stmpe811_gpioworker(FAR struct stmpe811_dev_s *priv) weak_function; |
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#endif |
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#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 */ |
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#endif /* __DRIVERS_INPUT_STMPE811_H */
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